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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * USB hub driver. | |
3 | * | |
4 | * (C) Copyright 1999 Linus Torvalds | |
5 | * (C) Copyright 1999 Johannes Erdfelt | |
6 | * (C) Copyright 1999 Gregory P. Smith | |
7 | * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) | |
8 | * | |
9 | */ | |
10 | ||
1da177e4 LT |
11 | #include <linux/kernel.h> |
12 | #include <linux/errno.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/moduleparam.h> | |
15 | #include <linux/completion.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/list.h> | |
18 | #include <linux/slab.h> | |
1da177e4 LT |
19 | #include <linux/ioctl.h> |
20 | #include <linux/usb.h> | |
21 | #include <linux/usbdevice_fs.h> | |
27729aad | 22 | #include <linux/usb/hcd.h> |
925aa46b | 23 | #include <linux/usb/otg.h> |
93362a87 | 24 | #include <linux/usb/quirks.h> |
9c8d6178 | 25 | #include <linux/kthread.h> |
4186ecf8 | 26 | #include <linux/mutex.h> |
7dfb7103 | 27 | #include <linux/freezer.h> |
b04b3156 | 28 | #include <linux/random.h> |
ad493e5e | 29 | #include <linux/pm_qos.h> |
1da177e4 | 30 | |
1da177e4 LT |
31 | #include <asm/uaccess.h> |
32 | #include <asm/byteorder.h> | |
33 | ||
6e30d7cb | 34 | #include "hub.h" |
1da177e4 | 35 | |
f2a383e4 GKH |
36 | /* if we are in debug mode, always announce new devices */ |
37 | #ifdef DEBUG | |
38 | #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES | |
39 | #define CONFIG_USB_ANNOUNCE_NEW_DEVICES | |
40 | #endif | |
41 | #endif | |
42 | ||
e6f30dea ML |
43 | #define USB_VENDOR_GENESYS_LOGIC 0x05e3 |
44 | #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01 | |
45 | ||
dbe79bbe JY |
46 | static inline int hub_is_superspeed(struct usb_device *hdev) |
47 | { | |
7bf01185 | 48 | return (hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS); |
dbe79bbe | 49 | } |
1bb5f66b | 50 | |
fa286188 | 51 | /* Protect struct usb_device->state and ->children members |
9ad3d6cc | 52 | * Note: Both are also protected by ->dev.sem, except that ->state can |
1da177e4 LT |
53 | * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ |
54 | static DEFINE_SPINLOCK(device_state_lock); | |
55 | ||
56 | /* khubd's worklist and its lock */ | |
57 | static DEFINE_SPINLOCK(hub_event_lock); | |
58 | static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ | |
59 | ||
60 | /* Wakes up khubd */ | |
61 | static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); | |
62 | ||
9c8d6178 | 63 | static struct task_struct *khubd_task; |
1da177e4 LT |
64 | |
65 | /* cycle leds on hubs that aren't blinking for attention */ | |
90ab5ee9 | 66 | static bool blinkenlights = 0; |
1da177e4 LT |
67 | module_param (blinkenlights, bool, S_IRUGO); |
68 | MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); | |
69 | ||
fd7c519d JK |
70 | /* |
71 | * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about | |
72 | * 10 seconds to send reply for the initial 64-byte descriptor request. | |
73 | */ | |
74 | /* define initial 64-byte descriptor request timeout in milliseconds */ | |
75 | static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; | |
76 | module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); | |
b9cef6c3 WF |
77 | MODULE_PARM_DESC(initial_descriptor_timeout, |
78 | "initial 64-byte descriptor request timeout in milliseconds " | |
79 | "(default 5000 - 5.0 seconds)"); | |
fd7c519d | 80 | |
1da177e4 LT |
81 | /* |
82 | * As of 2.6.10 we introduce a new USB device initialization scheme which | |
83 | * closely resembles the way Windows works. Hopefully it will be compatible | |
84 | * with a wider range of devices than the old scheme. However some previously | |
85 | * working devices may start giving rise to "device not accepting address" | |
86 | * errors; if that happens the user can try the old scheme by adjusting the | |
87 | * following module parameters. | |
88 | * | |
89 | * For maximum flexibility there are two boolean parameters to control the | |
90 | * hub driver's behavior. On the first initialization attempt, if the | |
91 | * "old_scheme_first" parameter is set then the old scheme will be used, | |
92 | * otherwise the new scheme is used. If that fails and "use_both_schemes" | |
93 | * is set, then the driver will make another attempt, using the other scheme. | |
94 | */ | |
90ab5ee9 | 95 | static bool old_scheme_first = 0; |
1da177e4 LT |
96 | module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); |
97 | MODULE_PARM_DESC(old_scheme_first, | |
98 | "start with the old device initialization scheme"); | |
99 | ||
90ab5ee9 | 100 | static bool use_both_schemes = 1; |
1da177e4 LT |
101 | module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); |
102 | MODULE_PARM_DESC(use_both_schemes, | |
103 | "try the other device initialization scheme if the " | |
104 | "first one fails"); | |
105 | ||
32fe0198 AS |
106 | /* Mutual exclusion for EHCI CF initialization. This interferes with |
107 | * port reset on some companion controllers. | |
108 | */ | |
109 | DECLARE_RWSEM(ehci_cf_port_reset_rwsem); | |
110 | EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); | |
111 | ||
ad493e5e | 112 | #define HUB_DEBOUNCE_TIMEOUT 2000 |
948fea37 AS |
113 | #define HUB_DEBOUNCE_STEP 25 |
114 | #define HUB_DEBOUNCE_STABLE 100 | |
115 | ||
742120c6 ML |
116 | static int usb_reset_and_verify_device(struct usb_device *udev); |
117 | ||
131dec34 | 118 | static inline char *portspeed(struct usb_hub *hub, int portstatus) |
1da177e4 | 119 | { |
131dec34 SS |
120 | if (hub_is_superspeed(hub->hdev)) |
121 | return "5.0 Gb/s"; | |
288ead45 | 122 | if (portstatus & USB_PORT_STAT_HIGH_SPEED) |
1da177e4 | 123 | return "480 Mb/s"; |
288ead45 | 124 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) |
1da177e4 LT |
125 | return "1.5 Mb/s"; |
126 | else | |
127 | return "12 Mb/s"; | |
128 | } | |
1da177e4 LT |
129 | |
130 | /* Note that hdev or one of its children must be locked! */ | |
ad493e5e | 131 | struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev) |
1da177e4 | 132 | { |
ff823c79 | 133 | if (!hdev || !hdev->actconfig || !hdev->maxchild) |
25118084 | 134 | return NULL; |
1da177e4 LT |
135 | return usb_get_intfdata(hdev->actconfig->interface[0]); |
136 | } | |
137 | ||
d9b2099c SS |
138 | static int usb_device_supports_lpm(struct usb_device *udev) |
139 | { | |
140 | /* USB 2.1 (and greater) devices indicate LPM support through | |
141 | * their USB 2.0 Extended Capabilities BOS descriptor. | |
142 | */ | |
143 | if (udev->speed == USB_SPEED_HIGH) { | |
144 | if (udev->bos->ext_cap && | |
145 | (USB_LPM_SUPPORT & | |
146 | le32_to_cpu(udev->bos->ext_cap->bmAttributes))) | |
147 | return 1; | |
148 | return 0; | |
149 | } | |
51e0a012 SS |
150 | |
151 | /* All USB 3.0 must support LPM, but we need their max exit latency | |
152 | * information from the SuperSpeed Extended Capabilities BOS descriptor. | |
153 | */ | |
154 | if (!udev->bos->ss_cap) { | |
155 | dev_warn(&udev->dev, "No LPM exit latency info found. " | |
156 | "Power management will be impacted.\n"); | |
157 | return 0; | |
158 | } | |
159 | if (udev->parent->lpm_capable) | |
160 | return 1; | |
161 | ||
162 | dev_warn(&udev->dev, "Parent hub missing LPM exit latency info. " | |
163 | "Power management will be impacted.\n"); | |
d9b2099c SS |
164 | return 0; |
165 | } | |
166 | ||
51e0a012 SS |
167 | /* |
168 | * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from | |
169 | * either U1 or U2. | |
170 | */ | |
171 | static void usb_set_lpm_mel(struct usb_device *udev, | |
172 | struct usb3_lpm_parameters *udev_lpm_params, | |
173 | unsigned int udev_exit_latency, | |
174 | struct usb_hub *hub, | |
175 | struct usb3_lpm_parameters *hub_lpm_params, | |
176 | unsigned int hub_exit_latency) | |
177 | { | |
178 | unsigned int total_mel; | |
179 | unsigned int device_mel; | |
180 | unsigned int hub_mel; | |
181 | ||
182 | /* | |
183 | * Calculate the time it takes to transition all links from the roothub | |
184 | * to the parent hub into U0. The parent hub must then decode the | |
185 | * packet (hub header decode latency) to figure out which port it was | |
186 | * bound for. | |
187 | * | |
188 | * The Hub Header decode latency is expressed in 0.1us intervals (0x1 | |
189 | * means 0.1us). Multiply that by 100 to get nanoseconds. | |
190 | */ | |
191 | total_mel = hub_lpm_params->mel + | |
192 | (hub->descriptor->u.ss.bHubHdrDecLat * 100); | |
193 | ||
194 | /* | |
195 | * How long will it take to transition the downstream hub's port into | |
196 | * U0? The greater of either the hub exit latency or the device exit | |
197 | * latency. | |
198 | * | |
199 | * The BOS U1/U2 exit latencies are expressed in 1us intervals. | |
200 | * Multiply that by 1000 to get nanoseconds. | |
201 | */ | |
202 | device_mel = udev_exit_latency * 1000; | |
203 | hub_mel = hub_exit_latency * 1000; | |
204 | if (device_mel > hub_mel) | |
205 | total_mel += device_mel; | |
206 | else | |
207 | total_mel += hub_mel; | |
208 | ||
209 | udev_lpm_params->mel = total_mel; | |
210 | } | |
211 | ||
212 | /* | |
213 | * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate | |
214 | * a transition from either U1 or U2. | |
215 | */ | |
216 | static void usb_set_lpm_pel(struct usb_device *udev, | |
217 | struct usb3_lpm_parameters *udev_lpm_params, | |
218 | unsigned int udev_exit_latency, | |
219 | struct usb_hub *hub, | |
220 | struct usb3_lpm_parameters *hub_lpm_params, | |
221 | unsigned int hub_exit_latency, | |
222 | unsigned int port_to_port_exit_latency) | |
223 | { | |
224 | unsigned int first_link_pel; | |
225 | unsigned int hub_pel; | |
226 | ||
227 | /* | |
228 | * First, the device sends an LFPS to transition the link between the | |
229 | * device and the parent hub into U0. The exit latency is the bigger of | |
230 | * the device exit latency or the hub exit latency. | |
231 | */ | |
232 | if (udev_exit_latency > hub_exit_latency) | |
233 | first_link_pel = udev_exit_latency * 1000; | |
234 | else | |
235 | first_link_pel = hub_exit_latency * 1000; | |
236 | ||
237 | /* | |
238 | * When the hub starts to receive the LFPS, there is a slight delay for | |
239 | * it to figure out that one of the ports is sending an LFPS. Then it | |
240 | * will forward the LFPS to its upstream link. The exit latency is the | |
241 | * delay, plus the PEL that we calculated for this hub. | |
242 | */ | |
243 | hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel; | |
244 | ||
245 | /* | |
246 | * According to figure C-7 in the USB 3.0 spec, the PEL for this device | |
247 | * is the greater of the two exit latencies. | |
248 | */ | |
249 | if (first_link_pel > hub_pel) | |
250 | udev_lpm_params->pel = first_link_pel; | |
251 | else | |
252 | udev_lpm_params->pel = hub_pel; | |
253 | } | |
254 | ||
255 | /* | |
256 | * Set the System Exit Latency (SEL) to indicate the total worst-case time from | |
257 | * when a device initiates a transition to U0, until when it will receive the | |
258 | * first packet from the host controller. | |
259 | * | |
260 | * Section C.1.5.1 describes the four components to this: | |
261 | * - t1: device PEL | |
262 | * - t2: time for the ERDY to make it from the device to the host. | |
263 | * - t3: a host-specific delay to process the ERDY. | |
264 | * - t4: time for the packet to make it from the host to the device. | |
265 | * | |
266 | * t3 is specific to both the xHCI host and the platform the host is integrated | |
267 | * into. The Intel HW folks have said it's negligible, FIXME if a different | |
268 | * vendor says otherwise. | |
269 | */ | |
270 | static void usb_set_lpm_sel(struct usb_device *udev, | |
271 | struct usb3_lpm_parameters *udev_lpm_params) | |
272 | { | |
273 | struct usb_device *parent; | |
274 | unsigned int num_hubs; | |
275 | unsigned int total_sel; | |
276 | ||
277 | /* t1 = device PEL */ | |
278 | total_sel = udev_lpm_params->pel; | |
279 | /* How many external hubs are in between the device & the root port. */ | |
280 | for (parent = udev->parent, num_hubs = 0; parent->parent; | |
281 | parent = parent->parent) | |
282 | num_hubs++; | |
283 | /* t2 = 2.1us + 250ns * (num_hubs - 1) */ | |
284 | if (num_hubs > 0) | |
285 | total_sel += 2100 + 250 * (num_hubs - 1); | |
286 | ||
287 | /* t4 = 250ns * num_hubs */ | |
288 | total_sel += 250 * num_hubs; | |
289 | ||
290 | udev_lpm_params->sel = total_sel; | |
291 | } | |
292 | ||
293 | static void usb_set_lpm_parameters(struct usb_device *udev) | |
294 | { | |
295 | struct usb_hub *hub; | |
296 | unsigned int port_to_port_delay; | |
297 | unsigned int udev_u1_del; | |
298 | unsigned int udev_u2_del; | |
299 | unsigned int hub_u1_del; | |
300 | unsigned int hub_u2_del; | |
301 | ||
302 | if (!udev->lpm_capable || udev->speed != USB_SPEED_SUPER) | |
303 | return; | |
304 | ||
ad493e5e | 305 | hub = usb_hub_to_struct_hub(udev->parent); |
51e0a012 SS |
306 | /* It doesn't take time to transition the roothub into U0, since it |
307 | * doesn't have an upstream link. | |
308 | */ | |
309 | if (!hub) | |
310 | return; | |
311 | ||
312 | udev_u1_del = udev->bos->ss_cap->bU1devExitLat; | |
313 | udev_u2_del = udev->bos->ss_cap->bU2DevExitLat; | |
314 | hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat; | |
315 | hub_u2_del = udev->parent->bos->ss_cap->bU2DevExitLat; | |
316 | ||
317 | usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del, | |
318 | hub, &udev->parent->u1_params, hub_u1_del); | |
319 | ||
320 | usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del, | |
321 | hub, &udev->parent->u2_params, hub_u2_del); | |
322 | ||
323 | /* | |
324 | * Appendix C, section C.2.2.2, says that there is a slight delay from | |
325 | * when the parent hub notices the downstream port is trying to | |
326 | * transition to U0 to when the hub initiates a U0 transition on its | |
327 | * upstream port. The section says the delays are tPort2PortU1EL and | |
328 | * tPort2PortU2EL, but it doesn't define what they are. | |
329 | * | |
330 | * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking | |
331 | * about the same delays. Use the maximum delay calculations from those | |
332 | * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For | |
333 | * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I | |
334 | * assume the device exit latencies they are talking about are the hub | |
335 | * exit latencies. | |
336 | * | |
337 | * What do we do if the U2 exit latency is less than the U1 exit | |
338 | * latency? It's possible, although not likely... | |
339 | */ | |
340 | port_to_port_delay = 1; | |
341 | ||
342 | usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del, | |
343 | hub, &udev->parent->u1_params, hub_u1_del, | |
344 | port_to_port_delay); | |
345 | ||
346 | if (hub_u2_del > hub_u1_del) | |
347 | port_to_port_delay = 1 + hub_u2_del - hub_u1_del; | |
348 | else | |
349 | port_to_port_delay = 1 + hub_u1_del; | |
350 | ||
351 | usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del, | |
352 | hub, &udev->parent->u2_params, hub_u2_del, | |
353 | port_to_port_delay); | |
354 | ||
355 | /* Now that we've got PEL, calculate SEL. */ | |
356 | usb_set_lpm_sel(udev, &udev->u1_params); | |
357 | usb_set_lpm_sel(udev, &udev->u2_params); | |
358 | } | |
359 | ||
1da177e4 | 360 | /* USB 2.0 spec Section 11.24.4.5 */ |
dbe79bbe | 361 | static int get_hub_descriptor(struct usb_device *hdev, void *data) |
1da177e4 | 362 | { |
dbe79bbe JY |
363 | int i, ret, size; |
364 | unsigned dtype; | |
365 | ||
366 | if (hub_is_superspeed(hdev)) { | |
367 | dtype = USB_DT_SS_HUB; | |
368 | size = USB_DT_SS_HUB_SIZE; | |
369 | } else { | |
370 | dtype = USB_DT_HUB; | |
371 | size = sizeof(struct usb_hub_descriptor); | |
372 | } | |
1da177e4 LT |
373 | |
374 | for (i = 0; i < 3; i++) { | |
375 | ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
376 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, | |
dbe79bbe | 377 | dtype << 8, 0, data, size, |
1da177e4 LT |
378 | USB_CTRL_GET_TIMEOUT); |
379 | if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) | |
380 | return ret; | |
381 | } | |
382 | return -EINVAL; | |
383 | } | |
384 | ||
385 | /* | |
386 | * USB 2.0 spec Section 11.24.2.1 | |
387 | */ | |
388 | static int clear_hub_feature(struct usb_device *hdev, int feature) | |
389 | { | |
390 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
391 | USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); | |
392 | } | |
393 | ||
394 | /* | |
395 | * USB 2.0 spec Section 11.24.2.2 | |
396 | */ | |
ad493e5e | 397 | int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature) |
1da177e4 LT |
398 | { |
399 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
400 | USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, | |
401 | NULL, 0, 1000); | |
402 | } | |
403 | ||
404 | /* | |
405 | * USB 2.0 spec Section 11.24.2.13 | |
406 | */ | |
407 | static int set_port_feature(struct usb_device *hdev, int port1, int feature) | |
408 | { | |
409 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
410 | USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, | |
411 | NULL, 0, 1000); | |
412 | } | |
413 | ||
414 | /* | |
415 | * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 | |
416 | * for info about using port indicators | |
417 | */ | |
418 | static void set_port_led( | |
419 | struct usb_hub *hub, | |
420 | int port1, | |
421 | int selector | |
422 | ) | |
423 | { | |
424 | int status = set_port_feature(hub->hdev, (selector << 8) | port1, | |
425 | USB_PORT_FEAT_INDICATOR); | |
426 | if (status < 0) | |
427 | dev_dbg (hub->intfdev, | |
428 | "port %d indicator %s status %d\n", | |
429 | port1, | |
430 | ({ char *s; switch (selector) { | |
431 | case HUB_LED_AMBER: s = "amber"; break; | |
432 | case HUB_LED_GREEN: s = "green"; break; | |
433 | case HUB_LED_OFF: s = "off"; break; | |
434 | case HUB_LED_AUTO: s = "auto"; break; | |
435 | default: s = "??"; break; | |
436 | }; s; }), | |
437 | status); | |
438 | } | |
439 | ||
440 | #define LED_CYCLE_PERIOD ((2*HZ)/3) | |
441 | ||
c4028958 | 442 | static void led_work (struct work_struct *work) |
1da177e4 | 443 | { |
c4028958 DH |
444 | struct usb_hub *hub = |
445 | container_of(work, struct usb_hub, leds.work); | |
1da177e4 LT |
446 | struct usb_device *hdev = hub->hdev; |
447 | unsigned i; | |
448 | unsigned changed = 0; | |
449 | int cursor = -1; | |
450 | ||
451 | if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) | |
452 | return; | |
453 | ||
454 | for (i = 0; i < hub->descriptor->bNbrPorts; i++) { | |
455 | unsigned selector, mode; | |
456 | ||
457 | /* 30%-50% duty cycle */ | |
458 | ||
459 | switch (hub->indicator[i]) { | |
460 | /* cycle marker */ | |
461 | case INDICATOR_CYCLE: | |
462 | cursor = i; | |
463 | selector = HUB_LED_AUTO; | |
464 | mode = INDICATOR_AUTO; | |
465 | break; | |
466 | /* blinking green = sw attention */ | |
467 | case INDICATOR_GREEN_BLINK: | |
468 | selector = HUB_LED_GREEN; | |
469 | mode = INDICATOR_GREEN_BLINK_OFF; | |
470 | break; | |
471 | case INDICATOR_GREEN_BLINK_OFF: | |
472 | selector = HUB_LED_OFF; | |
473 | mode = INDICATOR_GREEN_BLINK; | |
474 | break; | |
475 | /* blinking amber = hw attention */ | |
476 | case INDICATOR_AMBER_BLINK: | |
477 | selector = HUB_LED_AMBER; | |
478 | mode = INDICATOR_AMBER_BLINK_OFF; | |
479 | break; | |
480 | case INDICATOR_AMBER_BLINK_OFF: | |
481 | selector = HUB_LED_OFF; | |
482 | mode = INDICATOR_AMBER_BLINK; | |
483 | break; | |
484 | /* blink green/amber = reserved */ | |
485 | case INDICATOR_ALT_BLINK: | |
486 | selector = HUB_LED_GREEN; | |
487 | mode = INDICATOR_ALT_BLINK_OFF; | |
488 | break; | |
489 | case INDICATOR_ALT_BLINK_OFF: | |
490 | selector = HUB_LED_AMBER; | |
491 | mode = INDICATOR_ALT_BLINK; | |
492 | break; | |
493 | default: | |
494 | continue; | |
495 | } | |
496 | if (selector != HUB_LED_AUTO) | |
497 | changed = 1; | |
498 | set_port_led(hub, i + 1, selector); | |
499 | hub->indicator[i] = mode; | |
500 | } | |
501 | if (!changed && blinkenlights) { | |
502 | cursor++; | |
503 | cursor %= hub->descriptor->bNbrPorts; | |
504 | set_port_led(hub, cursor + 1, HUB_LED_GREEN); | |
505 | hub->indicator[cursor] = INDICATOR_CYCLE; | |
506 | changed++; | |
507 | } | |
508 | if (changed) | |
509 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); | |
510 | } | |
511 | ||
512 | /* use a short timeout for hub/port status fetches */ | |
513 | #define USB_STS_TIMEOUT 1000 | |
514 | #define USB_STS_RETRIES 5 | |
515 | ||
516 | /* | |
517 | * USB 2.0 spec Section 11.24.2.6 | |
518 | */ | |
519 | static int get_hub_status(struct usb_device *hdev, | |
520 | struct usb_hub_status *data) | |
521 | { | |
522 | int i, status = -ETIMEDOUT; | |
523 | ||
3824c1dd LP |
524 | for (i = 0; i < USB_STS_RETRIES && |
525 | (status == -ETIMEDOUT || status == -EPIPE); i++) { | |
1da177e4 LT |
526 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
527 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, | |
528 | data, sizeof(*data), USB_STS_TIMEOUT); | |
529 | } | |
530 | return status; | |
531 | } | |
532 | ||
533 | /* | |
534 | * USB 2.0 spec Section 11.24.2.7 | |
535 | */ | |
536 | static int get_port_status(struct usb_device *hdev, int port1, | |
537 | struct usb_port_status *data) | |
538 | { | |
539 | int i, status = -ETIMEDOUT; | |
540 | ||
3824c1dd LP |
541 | for (i = 0; i < USB_STS_RETRIES && |
542 | (status == -ETIMEDOUT || status == -EPIPE); i++) { | |
1da177e4 LT |
543 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
544 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, | |
545 | data, sizeof(*data), USB_STS_TIMEOUT); | |
546 | } | |
547 | return status; | |
548 | } | |
549 | ||
3eb14915 AS |
550 | static int hub_port_status(struct usb_hub *hub, int port1, |
551 | u16 *status, u16 *change) | |
552 | { | |
553 | int ret; | |
554 | ||
555 | mutex_lock(&hub->status_mutex); | |
556 | ret = get_port_status(hub->hdev, port1, &hub->status->port); | |
557 | if (ret < 4) { | |
e9e88fb7 AS |
558 | if (ret != -ENODEV) |
559 | dev_err(hub->intfdev, | |
560 | "%s failed (err = %d)\n", __func__, ret); | |
3eb14915 AS |
561 | if (ret >= 0) |
562 | ret = -EIO; | |
563 | } else { | |
564 | *status = le16_to_cpu(hub->status->port.wPortStatus); | |
565 | *change = le16_to_cpu(hub->status->port.wPortChange); | |
dbe79bbe | 566 | |
3eb14915 AS |
567 | ret = 0; |
568 | } | |
569 | mutex_unlock(&hub->status_mutex); | |
570 | return ret; | |
571 | } | |
572 | ||
1da177e4 LT |
573 | static void kick_khubd(struct usb_hub *hub) |
574 | { | |
575 | unsigned long flags; | |
576 | ||
577 | spin_lock_irqsave(&hub_event_lock, flags); | |
2e2c5eea | 578 | if (!hub->disconnected && list_empty(&hub->event_list)) { |
1da177e4 | 579 | list_add_tail(&hub->event_list, &hub_event_list); |
8e4ceb38 AS |
580 | |
581 | /* Suppress autosuspend until khubd runs */ | |
582 | usb_autopm_get_interface_no_resume( | |
583 | to_usb_interface(hub->intfdev)); | |
1da177e4 LT |
584 | wake_up(&khubd_wait); |
585 | } | |
586 | spin_unlock_irqrestore(&hub_event_lock, flags); | |
587 | } | |
588 | ||
589 | void usb_kick_khubd(struct usb_device *hdev) | |
590 | { | |
ad493e5e | 591 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
25118084 AS |
592 | |
593 | if (hub) | |
594 | kick_khubd(hub); | |
1da177e4 LT |
595 | } |
596 | ||
4ee823b8 SS |
597 | /* |
598 | * Let the USB core know that a USB 3.0 device has sent a Function Wake Device | |
599 | * Notification, which indicates it had initiated remote wakeup. | |
600 | * | |
601 | * USB 3.0 hubs do not report the port link state change from U3 to U0 when the | |
602 | * device initiates resume, so the USB core will not receive notice of the | |
603 | * resume through the normal hub interrupt URB. | |
604 | */ | |
605 | void usb_wakeup_notification(struct usb_device *hdev, | |
606 | unsigned int portnum) | |
607 | { | |
608 | struct usb_hub *hub; | |
609 | ||
610 | if (!hdev) | |
611 | return; | |
612 | ||
ad493e5e | 613 | hub = usb_hub_to_struct_hub(hdev); |
4ee823b8 SS |
614 | if (hub) { |
615 | set_bit(portnum, hub->wakeup_bits); | |
616 | kick_khubd(hub); | |
617 | } | |
618 | } | |
619 | EXPORT_SYMBOL_GPL(usb_wakeup_notification); | |
1da177e4 LT |
620 | |
621 | /* completion function, fires on port status changes and various faults */ | |
7d12e780 | 622 | static void hub_irq(struct urb *urb) |
1da177e4 | 623 | { |
ec17cf1c | 624 | struct usb_hub *hub = urb->context; |
e015268d | 625 | int status = urb->status; |
71d2718f | 626 | unsigned i; |
1da177e4 LT |
627 | unsigned long bits; |
628 | ||
e015268d | 629 | switch (status) { |
1da177e4 LT |
630 | case -ENOENT: /* synchronous unlink */ |
631 | case -ECONNRESET: /* async unlink */ | |
632 | case -ESHUTDOWN: /* hardware going away */ | |
633 | return; | |
634 | ||
635 | default: /* presumably an error */ | |
636 | /* Cause a hub reset after 10 consecutive errors */ | |
e015268d | 637 | dev_dbg (hub->intfdev, "transfer --> %d\n", status); |
1da177e4 LT |
638 | if ((++hub->nerrors < 10) || hub->error) |
639 | goto resubmit; | |
e015268d | 640 | hub->error = status; |
1da177e4 | 641 | /* FALL THROUGH */ |
ec17cf1c | 642 | |
1da177e4 LT |
643 | /* let khubd handle things */ |
644 | case 0: /* we got data: port status changed */ | |
645 | bits = 0; | |
646 | for (i = 0; i < urb->actual_length; ++i) | |
647 | bits |= ((unsigned long) ((*hub->buffer)[i])) | |
648 | << (i*8); | |
649 | hub->event_bits[0] = bits; | |
650 | break; | |
651 | } | |
652 | ||
653 | hub->nerrors = 0; | |
654 | ||
655 | /* Something happened, let khubd figure it out */ | |
656 | kick_khubd(hub); | |
657 | ||
658 | resubmit: | |
659 | if (hub->quiescing) | |
660 | return; | |
661 | ||
662 | if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 | |
663 | && status != -ENODEV && status != -EPERM) | |
664 | dev_err (hub->intfdev, "resubmit --> %d\n", status); | |
665 | } | |
666 | ||
667 | /* USB 2.0 spec Section 11.24.2.3 */ | |
668 | static inline int | |
669 | hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) | |
670 | { | |
2c7b871b WG |
671 | /* Need to clear both directions for control ep */ |
672 | if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) == | |
673 | USB_ENDPOINT_XFER_CONTROL) { | |
674 | int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
675 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, | |
676 | devinfo ^ 0x8000, tt, NULL, 0, 1000); | |
677 | if (status) | |
678 | return status; | |
679 | } | |
c2f6595f | 680 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
1da177e4 LT |
681 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, |
682 | tt, NULL, 0, 1000); | |
683 | } | |
684 | ||
685 | /* | |
686 | * enumeration blocks khubd for a long time. we use keventd instead, since | |
687 | * long blocking there is the exception, not the rule. accordingly, HCDs | |
688 | * talking to TTs must queue control transfers (not just bulk and iso), so | |
689 | * both can talk to the same hub concurrently. | |
690 | */ | |
cb88a1b8 | 691 | static void hub_tt_work(struct work_struct *work) |
1da177e4 | 692 | { |
c4028958 | 693 | struct usb_hub *hub = |
cb88a1b8 | 694 | container_of(work, struct usb_hub, tt.clear_work); |
1da177e4 LT |
695 | unsigned long flags; |
696 | ||
697 | spin_lock_irqsave (&hub->tt.lock, flags); | |
3b6054da | 698 | while (!list_empty(&hub->tt.clear_list)) { |
d0f830d3 | 699 | struct list_head *next; |
1da177e4 LT |
700 | struct usb_tt_clear *clear; |
701 | struct usb_device *hdev = hub->hdev; | |
cb88a1b8 | 702 | const struct hc_driver *drv; |
1da177e4 LT |
703 | int status; |
704 | ||
d0f830d3 HS |
705 | next = hub->tt.clear_list.next; |
706 | clear = list_entry (next, struct usb_tt_clear, clear_list); | |
1da177e4 LT |
707 | list_del (&clear->clear_list); |
708 | ||
709 | /* drop lock so HCD can concurrently report other TT errors */ | |
710 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
711 | status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); | |
e9e88fb7 | 712 | if (status && status != -ENODEV) |
1da177e4 LT |
713 | dev_err (&hdev->dev, |
714 | "clear tt %d (%04x) error %d\n", | |
715 | clear->tt, clear->devinfo, status); | |
cb88a1b8 AS |
716 | |
717 | /* Tell the HCD, even if the operation failed */ | |
718 | drv = clear->hcd->driver; | |
719 | if (drv->clear_tt_buffer_complete) | |
720 | (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); | |
721 | ||
1bc3c9e1 | 722 | kfree(clear); |
cb88a1b8 | 723 | spin_lock_irqsave(&hub->tt.lock, flags); |
1da177e4 LT |
724 | } |
725 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
726 | } | |
727 | ||
971fcd49 LT |
728 | /** |
729 | * usb_hub_set_port_power - control hub port's power state | |
41341261 MN |
730 | * @hdev: USB device belonging to the usb hub |
731 | * @hub: target hub | |
971fcd49 LT |
732 | * @port1: port index |
733 | * @set: expected status | |
734 | * | |
735 | * call this function to control port's power via setting or | |
736 | * clearing the port's PORT_POWER feature. | |
737 | */ | |
41341261 MN |
738 | int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub, |
739 | int port1, bool set) | |
971fcd49 LT |
740 | { |
741 | int ret; | |
ad493e5e | 742 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
971fcd49 LT |
743 | |
744 | if (set) | |
745 | ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); | |
746 | else | |
ad493e5e LT |
747 | ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
748 | ||
749 | if (!ret) | |
750 | port_dev->power_is_on = set; | |
971fcd49 LT |
751 | return ret; |
752 | } | |
753 | ||
1da177e4 | 754 | /** |
cb88a1b8 AS |
755 | * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub |
756 | * @urb: an URB associated with the failed or incomplete split transaction | |
1da177e4 LT |
757 | * |
758 | * High speed HCDs use this to tell the hub driver that some split control or | |
759 | * bulk transaction failed in a way that requires clearing internal state of | |
760 | * a transaction translator. This is normally detected (and reported) from | |
761 | * interrupt context. | |
762 | * | |
763 | * It may not be possible for that hub to handle additional full (or low) | |
764 | * speed transactions until that state is fully cleared out. | |
765 | */ | |
cb88a1b8 | 766 | int usb_hub_clear_tt_buffer(struct urb *urb) |
1da177e4 | 767 | { |
cb88a1b8 AS |
768 | struct usb_device *udev = urb->dev; |
769 | int pipe = urb->pipe; | |
1da177e4 LT |
770 | struct usb_tt *tt = udev->tt; |
771 | unsigned long flags; | |
772 | struct usb_tt_clear *clear; | |
773 | ||
774 | /* we've got to cope with an arbitrary number of pending TT clears, | |
775 | * since each TT has "at least two" buffers that can need it (and | |
776 | * there can be many TTs per hub). even if they're uncommon. | |
777 | */ | |
54e6ecb2 | 778 | if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { |
1da177e4 LT |
779 | dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); |
780 | /* FIXME recover somehow ... RESET_TT? */ | |
cb88a1b8 | 781 | return -ENOMEM; |
1da177e4 LT |
782 | } |
783 | ||
784 | /* info that CLEAR_TT_BUFFER needs */ | |
785 | clear->tt = tt->multi ? udev->ttport : 1; | |
786 | clear->devinfo = usb_pipeendpoint (pipe); | |
787 | clear->devinfo |= udev->devnum << 4; | |
788 | clear->devinfo |= usb_pipecontrol (pipe) | |
789 | ? (USB_ENDPOINT_XFER_CONTROL << 11) | |
790 | : (USB_ENDPOINT_XFER_BULK << 11); | |
791 | if (usb_pipein (pipe)) | |
792 | clear->devinfo |= 1 << 15; | |
cb88a1b8 AS |
793 | |
794 | /* info for completion callback */ | |
795 | clear->hcd = bus_to_hcd(udev->bus); | |
796 | clear->ep = urb->ep; | |
797 | ||
1da177e4 LT |
798 | /* tell keventd to clear state for this TT */ |
799 | spin_lock_irqsave (&tt->lock, flags); | |
800 | list_add_tail (&clear->clear_list, &tt->clear_list); | |
cb88a1b8 | 801 | schedule_work(&tt->clear_work); |
1da177e4 | 802 | spin_unlock_irqrestore (&tt->lock, flags); |
cb88a1b8 | 803 | return 0; |
1da177e4 | 804 | } |
cb88a1b8 | 805 | EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); |
1da177e4 | 806 | |
8520f380 AS |
807 | /* If do_delay is false, return the number of milliseconds the caller |
808 | * needs to delay. | |
809 | */ | |
810 | static unsigned hub_power_on(struct usb_hub *hub, bool do_delay) | |
1da177e4 LT |
811 | { |
812 | int port1; | |
b789696a | 813 | unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; |
8520f380 | 814 | unsigned delay; |
4489a571 AS |
815 | u16 wHubCharacteristics = |
816 | le16_to_cpu(hub->descriptor->wHubCharacteristics); | |
817 | ||
818 | /* Enable power on each port. Some hubs have reserved values | |
819 | * of LPSM (> 2) in their descriptors, even though they are | |
820 | * USB 2.0 hubs. Some hubs do not implement port-power switching | |
821 | * but only emulate it. In all cases, the ports won't work | |
822 | * unless we send these messages to the hub. | |
823 | */ | |
824 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) | |
1da177e4 | 825 | dev_dbg(hub->intfdev, "enabling power on all ports\n"); |
4489a571 AS |
826 | else |
827 | dev_dbg(hub->intfdev, "trying to enable port power on " | |
828 | "non-switchable hub\n"); | |
829 | for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) | |
ad493e5e LT |
830 | if (hub->ports[port1 - 1]->power_is_on) |
831 | set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); | |
832 | else | |
833 | usb_clear_port_feature(hub->hdev, port1, | |
834 | USB_PORT_FEAT_POWER); | |
1da177e4 | 835 | |
b789696a | 836 | /* Wait at least 100 msec for power to become stable */ |
8520f380 AS |
837 | delay = max(pgood_delay, (unsigned) 100); |
838 | if (do_delay) | |
839 | msleep(delay); | |
840 | return delay; | |
1da177e4 LT |
841 | } |
842 | ||
1da177e4 LT |
843 | static int hub_hub_status(struct usb_hub *hub, |
844 | u16 *status, u16 *change) | |
845 | { | |
846 | int ret; | |
847 | ||
db90e7a1 | 848 | mutex_lock(&hub->status_mutex); |
1da177e4 | 849 | ret = get_hub_status(hub->hdev, &hub->status->hub); |
e9e88fb7 AS |
850 | if (ret < 0) { |
851 | if (ret != -ENODEV) | |
852 | dev_err(hub->intfdev, | |
853 | "%s failed (err = %d)\n", __func__, ret); | |
854 | } else { | |
1da177e4 LT |
855 | *status = le16_to_cpu(hub->status->hub.wHubStatus); |
856 | *change = le16_to_cpu(hub->status->hub.wHubChange); | |
857 | ret = 0; | |
858 | } | |
db90e7a1 | 859 | mutex_unlock(&hub->status_mutex); |
1da177e4 LT |
860 | return ret; |
861 | } | |
862 | ||
41e7e056 SS |
863 | static int hub_set_port_link_state(struct usb_hub *hub, int port1, |
864 | unsigned int link_status) | |
865 | { | |
866 | return set_port_feature(hub->hdev, | |
867 | port1 | (link_status << 3), | |
868 | USB_PORT_FEAT_LINK_STATE); | |
869 | } | |
870 | ||
871 | /* | |
872 | * If USB 3.0 ports are placed into the Disabled state, they will no longer | |
873 | * detect any device connects or disconnects. This is generally not what the | |
874 | * USB core wants, since it expects a disabled port to produce a port status | |
875 | * change event when a new device connects. | |
876 | * | |
877 | * Instead, set the link state to Disabled, wait for the link to settle into | |
878 | * that state, clear any change bits, and then put the port into the RxDetect | |
879 | * state. | |
880 | */ | |
881 | static int hub_usb3_port_disable(struct usb_hub *hub, int port1) | |
882 | { | |
883 | int ret; | |
884 | int total_time; | |
885 | u16 portchange, portstatus; | |
886 | ||
887 | if (!hub_is_superspeed(hub->hdev)) | |
888 | return -EINVAL; | |
889 | ||
890 | ret = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_SS_DISABLED); | |
e9e88fb7 | 891 | if (ret) |
41e7e056 | 892 | return ret; |
41e7e056 SS |
893 | |
894 | /* Wait for the link to enter the disabled state. */ | |
895 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { | |
896 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
897 | if (ret < 0) | |
898 | return ret; | |
899 | ||
900 | if ((portstatus & USB_PORT_STAT_LINK_STATE) == | |
901 | USB_SS_PORT_LS_SS_DISABLED) | |
902 | break; | |
903 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
904 | break; | |
905 | msleep(HUB_DEBOUNCE_STEP); | |
906 | } | |
907 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
908 | dev_warn(hub->intfdev, "Could not disable port %d after %d ms\n", | |
909 | port1, total_time); | |
910 | ||
911 | return hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_RX_DETECT); | |
912 | } | |
913 | ||
8b28c752 AS |
914 | static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) |
915 | { | |
916 | struct usb_device *hdev = hub->hdev; | |
0458d5b4 | 917 | int ret = 0; |
8b28c752 | 918 | |
ff823c79 LT |
919 | if (hub->ports[port1 - 1]->child && set_state) |
920 | usb_set_device_state(hub->ports[port1 - 1]->child, | |
8b28c752 | 921 | USB_STATE_NOTATTACHED); |
41e7e056 SS |
922 | if (!hub->error) { |
923 | if (hub_is_superspeed(hub->hdev)) | |
924 | ret = hub_usb3_port_disable(hub, port1); | |
925 | else | |
ad493e5e | 926 | ret = usb_clear_port_feature(hdev, port1, |
41e7e056 SS |
927 | USB_PORT_FEAT_ENABLE); |
928 | } | |
e9e88fb7 | 929 | if (ret && ret != -ENODEV) |
8b28c752 | 930 | dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", |
0458d5b4 | 931 | port1, ret); |
8b28c752 AS |
932 | return ret; |
933 | } | |
934 | ||
0458d5b4 | 935 | /* |
6d42fcdb | 936 | * Disable a port and mark a logical connect-change event, so that some |
0458d5b4 AS |
937 | * time later khubd will disconnect() any existing usb_device on the port |
938 | * and will re-enumerate if there actually is a device attached. | |
939 | */ | |
940 | static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) | |
941 | { | |
942 | dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); | |
943 | hub_port_disable(hub, port1, 1); | |
7d069b7d | 944 | |
0458d5b4 AS |
945 | /* FIXME let caller ask to power down the port: |
946 | * - some devices won't enumerate without a VBUS power cycle | |
947 | * - SRP saves power that way | |
948 | * - ... new call, TBD ... | |
949 | * That's easy if this hub can switch power per-port, and | |
950 | * khubd reactivates the port later (timer, SRP, etc). | |
951 | * Powerdown must be optional, because of reset/DFU. | |
952 | */ | |
953 | ||
954 | set_bit(port1, hub->change_bits); | |
955 | kick_khubd(hub); | |
956 | } | |
957 | ||
253e0572 AS |
958 | /** |
959 | * usb_remove_device - disable a device's port on its parent hub | |
960 | * @udev: device to be disabled and removed | |
961 | * Context: @udev locked, must be able to sleep. | |
962 | * | |
963 | * After @udev's port has been disabled, khubd is notified and it will | |
964 | * see that the device has been disconnected. When the device is | |
965 | * physically unplugged and something is plugged in, the events will | |
966 | * be received and processed normally. | |
967 | */ | |
968 | int usb_remove_device(struct usb_device *udev) | |
969 | { | |
970 | struct usb_hub *hub; | |
971 | struct usb_interface *intf; | |
972 | ||
973 | if (!udev->parent) /* Can't remove a root hub */ | |
974 | return -EINVAL; | |
ad493e5e | 975 | hub = usb_hub_to_struct_hub(udev->parent); |
253e0572 AS |
976 | intf = to_usb_interface(hub->intfdev); |
977 | ||
978 | usb_autopm_get_interface(intf); | |
979 | set_bit(udev->portnum, hub->removed_bits); | |
980 | hub_port_logical_disconnect(hub, udev->portnum); | |
981 | usb_autopm_put_interface(intf); | |
982 | return 0; | |
983 | } | |
984 | ||
6ee0b270 | 985 | enum hub_activation_type { |
8e4ceb38 | 986 | HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ |
8520f380 | 987 | HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, |
6ee0b270 | 988 | }; |
5e6effae | 989 | |
8520f380 AS |
990 | static void hub_init_func2(struct work_struct *ws); |
991 | static void hub_init_func3(struct work_struct *ws); | |
992 | ||
f2835219 | 993 | static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) |
5e6effae AS |
994 | { |
995 | struct usb_device *hdev = hub->hdev; | |
653a39d1 SS |
996 | struct usb_hcd *hcd; |
997 | int ret; | |
5e6effae | 998 | int port1; |
f2835219 | 999 | int status; |
948fea37 | 1000 | bool need_debounce_delay = false; |
8520f380 AS |
1001 | unsigned delay; |
1002 | ||
1003 | /* Continue a partial initialization */ | |
1004 | if (type == HUB_INIT2) | |
1005 | goto init2; | |
1006 | if (type == HUB_INIT3) | |
1007 | goto init3; | |
5e6effae | 1008 | |
a45aa3b3 EF |
1009 | /* The superspeed hub except for root hub has to use Hub Depth |
1010 | * value as an offset into the route string to locate the bits | |
1011 | * it uses to determine the downstream port number. So hub driver | |
1012 | * should send a set hub depth request to superspeed hub after | |
1013 | * the superspeed hub is set configuration in initialization or | |
1014 | * reset procedure. | |
1015 | * | |
1016 | * After a resume, port power should still be on. | |
f2835219 AS |
1017 | * For any other type of activation, turn it on. |
1018 | */ | |
8520f380 | 1019 | if (type != HUB_RESUME) { |
a45aa3b3 EF |
1020 | if (hdev->parent && hub_is_superspeed(hdev)) { |
1021 | ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
1022 | HUB_SET_DEPTH, USB_RT_HUB, | |
1023 | hdev->level - 1, 0, NULL, 0, | |
1024 | USB_CTRL_SET_TIMEOUT); | |
1025 | if (ret < 0) | |
1026 | dev_err(hub->intfdev, | |
1027 | "set hub depth failed\n"); | |
1028 | } | |
8520f380 AS |
1029 | |
1030 | /* Speed up system boot by using a delayed_work for the | |
1031 | * hub's initial power-up delays. This is pretty awkward | |
1032 | * and the implementation looks like a home-brewed sort of | |
1033 | * setjmp/longjmp, but it saves at least 100 ms for each | |
1034 | * root hub (assuming usbcore is compiled into the kernel | |
1035 | * rather than as a module). It adds up. | |
1036 | * | |
1037 | * This can't be done for HUB_RESUME or HUB_RESET_RESUME | |
1038 | * because for those activation types the ports have to be | |
1039 | * operational when we return. In theory this could be done | |
1040 | * for HUB_POST_RESET, but it's easier not to. | |
1041 | */ | |
1042 | if (type == HUB_INIT) { | |
1043 | delay = hub_power_on(hub, false); | |
1044 | PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2); | |
1045 | schedule_delayed_work(&hub->init_work, | |
1046 | msecs_to_jiffies(delay)); | |
61fbeba1 AS |
1047 | |
1048 | /* Suppress autosuspend until init is done */ | |
8e4ceb38 AS |
1049 | usb_autopm_get_interface_no_resume( |
1050 | to_usb_interface(hub->intfdev)); | |
8520f380 | 1051 | return; /* Continues at init2: below */ |
653a39d1 SS |
1052 | } else if (type == HUB_RESET_RESUME) { |
1053 | /* The internal host controller state for the hub device | |
1054 | * may be gone after a host power loss on system resume. | |
1055 | * Update the device's info so the HW knows it's a hub. | |
1056 | */ | |
1057 | hcd = bus_to_hcd(hdev->bus); | |
1058 | if (hcd->driver->update_hub_device) { | |
1059 | ret = hcd->driver->update_hub_device(hcd, hdev, | |
1060 | &hub->tt, GFP_NOIO); | |
1061 | if (ret < 0) { | |
1062 | dev_err(hub->intfdev, "Host not " | |
1063 | "accepting hub info " | |
1064 | "update.\n"); | |
1065 | dev_err(hub->intfdev, "LS/FS devices " | |
1066 | "and hubs may not work " | |
1067 | "under this hub\n."); | |
1068 | } | |
1069 | } | |
1070 | hub_power_on(hub, true); | |
8520f380 AS |
1071 | } else { |
1072 | hub_power_on(hub, true); | |
1073 | } | |
1074 | } | |
1075 | init2: | |
f2835219 | 1076 | |
6ee0b270 AS |
1077 | /* Check each port and set hub->change_bits to let khubd know |
1078 | * which ports need attention. | |
5e6effae AS |
1079 | */ |
1080 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
ff823c79 | 1081 | struct usb_device *udev = hub->ports[port1 - 1]->child; |
5e6effae AS |
1082 | u16 portstatus, portchange; |
1083 | ||
6ee0b270 AS |
1084 | portstatus = portchange = 0; |
1085 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
1086 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) | |
1087 | dev_dbg(hub->intfdev, | |
1088 | "port %d: status %04x change %04x\n", | |
1089 | port1, portstatus, portchange); | |
1090 | ||
1091 | /* After anything other than HUB_RESUME (i.e., initialization | |
1092 | * or any sort of reset), every port should be disabled. | |
1093 | * Unconnected ports should likewise be disabled (paranoia), | |
1094 | * and so should ports for which we have no usb_device. | |
1095 | */ | |
1096 | if ((portstatus & USB_PORT_STAT_ENABLE) && ( | |
1097 | type != HUB_RESUME || | |
1098 | !(portstatus & USB_PORT_STAT_CONNECTION) || | |
1099 | !udev || | |
1100 | udev->state == USB_STATE_NOTATTACHED)) { | |
9f0a6cd3 AX |
1101 | /* |
1102 | * USB3 protocol ports will automatically transition | |
1103 | * to Enabled state when detect an USB3.0 device attach. | |
1104 | * Do not disable USB3 protocol ports. | |
9f0a6cd3 | 1105 | */ |
131dec34 | 1106 | if (!hub_is_superspeed(hdev)) { |
ad493e5e | 1107 | usb_clear_port_feature(hdev, port1, |
9f0a6cd3 AX |
1108 | USB_PORT_FEAT_ENABLE); |
1109 | portstatus &= ~USB_PORT_STAT_ENABLE; | |
85f0ff46 SS |
1110 | } else { |
1111 | /* Pretend that power was lost for USB3 devs */ | |
1112 | portstatus &= ~USB_PORT_STAT_ENABLE; | |
9f0a6cd3 | 1113 | } |
5e6effae AS |
1114 | } |
1115 | ||
948fea37 AS |
1116 | /* Clear status-change flags; we'll debounce later */ |
1117 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
1118 | need_debounce_delay = true; | |
ad493e5e | 1119 | usb_clear_port_feature(hub->hdev, port1, |
948fea37 AS |
1120 | USB_PORT_FEAT_C_CONNECTION); |
1121 | } | |
1122 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
1123 | need_debounce_delay = true; | |
ad493e5e | 1124 | usb_clear_port_feature(hub->hdev, port1, |
948fea37 AS |
1125 | USB_PORT_FEAT_C_ENABLE); |
1126 | } | |
79c3dd81 DZ |
1127 | if ((portchange & USB_PORT_STAT_C_BH_RESET) && |
1128 | hub_is_superspeed(hub->hdev)) { | |
1129 | need_debounce_delay = true; | |
ad493e5e | 1130 | usb_clear_port_feature(hub->hdev, port1, |
79c3dd81 DZ |
1131 | USB_PORT_FEAT_C_BH_PORT_RESET); |
1132 | } | |
253e0572 AS |
1133 | /* We can forget about a "removed" device when there's a |
1134 | * physical disconnect or the connect status changes. | |
1135 | */ | |
1136 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
1137 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
1138 | clear_bit(port1, hub->removed_bits); | |
1139 | ||
6ee0b270 AS |
1140 | if (!udev || udev->state == USB_STATE_NOTATTACHED) { |
1141 | /* Tell khubd to disconnect the device or | |
1142 | * check for a new connection | |
1143 | */ | |
1144 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) | |
1145 | set_bit(port1, hub->change_bits); | |
1146 | ||
1147 | } else if (portstatus & USB_PORT_STAT_ENABLE) { | |
72937e1e SS |
1148 | bool port_resumed = (portstatus & |
1149 | USB_PORT_STAT_LINK_STATE) == | |
1150 | USB_SS_PORT_LS_U0; | |
6ee0b270 AS |
1151 | /* The power session apparently survived the resume. |
1152 | * If there was an overcurrent or suspend change | |
1153 | * (i.e., remote wakeup request), have khubd | |
72937e1e SS |
1154 | * take care of it. Look at the port link state |
1155 | * for USB 3.0 hubs, since they don't have a suspend | |
1156 | * change bit, and they don't set the port link change | |
1157 | * bit on device-initiated resume. | |
6ee0b270 | 1158 | */ |
72937e1e SS |
1159 | if (portchange || (hub_is_superspeed(hub->hdev) && |
1160 | port_resumed)) | |
6ee0b270 | 1161 | set_bit(port1, hub->change_bits); |
5e6effae | 1162 | |
6ee0b270 | 1163 | } else if (udev->persist_enabled) { |
ad493e5e LT |
1164 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
1165 | ||
6ee0b270 | 1166 | #ifdef CONFIG_PM |
5e6effae | 1167 | udev->reset_resume = 1; |
6ee0b270 | 1168 | #endif |
ad493e5e LT |
1169 | /* Don't set the change_bits when the device |
1170 | * was powered off. | |
1171 | */ | |
1172 | if (port_dev->power_is_on) | |
1173 | set_bit(port1, hub->change_bits); | |
8808f00c | 1174 | |
6ee0b270 AS |
1175 | } else { |
1176 | /* The power session is gone; tell khubd */ | |
1177 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
1178 | set_bit(port1, hub->change_bits); | |
5e6effae | 1179 | } |
5e6effae AS |
1180 | } |
1181 | ||
948fea37 AS |
1182 | /* If no port-status-change flags were set, we don't need any |
1183 | * debouncing. If flags were set we can try to debounce the | |
1184 | * ports all at once right now, instead of letting khubd do them | |
1185 | * one at a time later on. | |
1186 | * | |
1187 | * If any port-status changes do occur during this delay, khubd | |
1188 | * will see them later and handle them normally. | |
1189 | */ | |
8520f380 AS |
1190 | if (need_debounce_delay) { |
1191 | delay = HUB_DEBOUNCE_STABLE; | |
1192 | ||
1193 | /* Don't do a long sleep inside a workqueue routine */ | |
1194 | if (type == HUB_INIT2) { | |
1195 | PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3); | |
1196 | schedule_delayed_work(&hub->init_work, | |
1197 | msecs_to_jiffies(delay)); | |
1198 | return; /* Continues at init3: below */ | |
1199 | } else { | |
1200 | msleep(delay); | |
1201 | } | |
1202 | } | |
1203 | init3: | |
f2835219 AS |
1204 | hub->quiescing = 0; |
1205 | ||
1206 | status = usb_submit_urb(hub->urb, GFP_NOIO); | |
1207 | if (status < 0) | |
1208 | dev_err(hub->intfdev, "activate --> %d\n", status); | |
1209 | if (hub->has_indicators && blinkenlights) | |
1210 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); | |
1211 | ||
1212 | /* Scan all ports that need attention */ | |
1213 | kick_khubd(hub); | |
8e4ceb38 AS |
1214 | |
1215 | /* Allow autosuspend if it was suppressed */ | |
1216 | if (type <= HUB_INIT3) | |
1217 | usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); | |
5e6effae AS |
1218 | } |
1219 | ||
8520f380 AS |
1220 | /* Implement the continuations for the delays above */ |
1221 | static void hub_init_func2(struct work_struct *ws) | |
1222 | { | |
1223 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
1224 | ||
1225 | hub_activate(hub, HUB_INIT2); | |
1226 | } | |
1227 | ||
1228 | static void hub_init_func3(struct work_struct *ws) | |
1229 | { | |
1230 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
1231 | ||
1232 | hub_activate(hub, HUB_INIT3); | |
1233 | } | |
1234 | ||
4330354f AS |
1235 | enum hub_quiescing_type { |
1236 | HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND | |
1237 | }; | |
1238 | ||
1239 | static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) | |
1240 | { | |
1241 | struct usb_device *hdev = hub->hdev; | |
1242 | int i; | |
1243 | ||
8520f380 AS |
1244 | cancel_delayed_work_sync(&hub->init_work); |
1245 | ||
4330354f AS |
1246 | /* khubd and related activity won't re-trigger */ |
1247 | hub->quiescing = 1; | |
1248 | ||
1249 | if (type != HUB_SUSPEND) { | |
1250 | /* Disconnect all the children */ | |
1251 | for (i = 0; i < hdev->maxchild; ++i) { | |
ff823c79 LT |
1252 | if (hub->ports[i]->child) |
1253 | usb_disconnect(&hub->ports[i]->child); | |
4330354f AS |
1254 | } |
1255 | } | |
1256 | ||
1257 | /* Stop khubd and related activity */ | |
1258 | usb_kill_urb(hub->urb); | |
1259 | if (hub->has_indicators) | |
1260 | cancel_delayed_work_sync(&hub->leds); | |
1261 | if (hub->tt.hub) | |
036546bf | 1262 | flush_work(&hub->tt.clear_work); |
4330354f AS |
1263 | } |
1264 | ||
3eb14915 AS |
1265 | /* caller has locked the hub device */ |
1266 | static int hub_pre_reset(struct usb_interface *intf) | |
1267 | { | |
1268 | struct usb_hub *hub = usb_get_intfdata(intf); | |
1269 | ||
4330354f | 1270 | hub_quiesce(hub, HUB_PRE_RESET); |
f07600cf | 1271 | return 0; |
7d069b7d AS |
1272 | } |
1273 | ||
1274 | /* caller has locked the hub device */ | |
f07600cf | 1275 | static int hub_post_reset(struct usb_interface *intf) |
7d069b7d | 1276 | { |
7de18d8b AS |
1277 | struct usb_hub *hub = usb_get_intfdata(intf); |
1278 | ||
f2835219 | 1279 | hub_activate(hub, HUB_POST_RESET); |
f07600cf | 1280 | return 0; |
7d069b7d AS |
1281 | } |
1282 | ||
1da177e4 LT |
1283 | static int hub_configure(struct usb_hub *hub, |
1284 | struct usb_endpoint_descriptor *endpoint) | |
1285 | { | |
b356b7c7 | 1286 | struct usb_hcd *hcd; |
1da177e4 LT |
1287 | struct usb_device *hdev = hub->hdev; |
1288 | struct device *hub_dev = hub->intfdev; | |
1289 | u16 hubstatus, hubchange; | |
74ad9bd2 | 1290 | u16 wHubCharacteristics; |
1da177e4 | 1291 | unsigned int pipe; |
fa2a9566 | 1292 | int maxp, ret, i; |
7cbe5dca | 1293 | char *message = "out of memory"; |
430ee58e SAS |
1294 | unsigned unit_load; |
1295 | unsigned full_load; | |
1da177e4 | 1296 | |
d697cdda | 1297 | hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); |
1da177e4 | 1298 | if (!hub->buffer) { |
1da177e4 LT |
1299 | ret = -ENOMEM; |
1300 | goto fail; | |
1301 | } | |
1302 | ||
1303 | hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); | |
1304 | if (!hub->status) { | |
1da177e4 LT |
1305 | ret = -ENOMEM; |
1306 | goto fail; | |
1307 | } | |
db90e7a1 | 1308 | mutex_init(&hub->status_mutex); |
1da177e4 LT |
1309 | |
1310 | hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); | |
1311 | if (!hub->descriptor) { | |
1da177e4 LT |
1312 | ret = -ENOMEM; |
1313 | goto fail; | |
1314 | } | |
1315 | ||
1316 | /* Request the entire hub descriptor. | |
1317 | * hub->descriptor can handle USB_MAXCHILDREN ports, | |
1318 | * but the hub can/will return fewer bytes here. | |
1319 | */ | |
dbe79bbe | 1320 | ret = get_hub_descriptor(hdev, hub->descriptor); |
1da177e4 LT |
1321 | if (ret < 0) { |
1322 | message = "can't read hub descriptor"; | |
1323 | goto fail; | |
1324 | } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { | |
1325 | message = "hub has too many ports!"; | |
1326 | ret = -ENODEV; | |
1327 | goto fail; | |
769d7368 DL |
1328 | } else if (hub->descriptor->bNbrPorts == 0) { |
1329 | message = "hub doesn't have any ports!"; | |
1330 | ret = -ENODEV; | |
1331 | goto fail; | |
1da177e4 LT |
1332 | } |
1333 | ||
1334 | hdev->maxchild = hub->descriptor->bNbrPorts; | |
1335 | dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, | |
1336 | (hdev->maxchild == 1) ? "" : "s"); | |
1337 | ||
fa2a9566 LT |
1338 | hub->ports = kzalloc(hdev->maxchild * sizeof(struct usb_port *), |
1339 | GFP_KERNEL); | |
ff823c79 | 1340 | if (!hub->ports) { |
7cbe5dca AS |
1341 | ret = -ENOMEM; |
1342 | goto fail; | |
1343 | } | |
1344 | ||
74ad9bd2 | 1345 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
430ee58e SAS |
1346 | if (hub_is_superspeed(hdev)) { |
1347 | unit_load = 150; | |
1348 | full_load = 900; | |
1349 | } else { | |
1350 | unit_load = 100; | |
1351 | full_load = 500; | |
1352 | } | |
1da177e4 | 1353 | |
dbe79bbe JY |
1354 | /* FIXME for USB 3.0, skip for now */ |
1355 | if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && | |
1356 | !(hub_is_superspeed(hdev))) { | |
1da177e4 LT |
1357 | int i; |
1358 | char portstr [USB_MAXCHILDREN + 1]; | |
1359 | ||
1360 | for (i = 0; i < hdev->maxchild; i++) | |
dbe79bbe | 1361 | portstr[i] = hub->descriptor->u.hs.DeviceRemovable |
1da177e4 LT |
1362 | [((i + 1) / 8)] & (1 << ((i + 1) % 8)) |
1363 | ? 'F' : 'R'; | |
1364 | portstr[hdev->maxchild] = 0; | |
1365 | dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); | |
1366 | } else | |
1367 | dev_dbg(hub_dev, "standalone hub\n"); | |
1368 | ||
74ad9bd2 | 1369 | switch (wHubCharacteristics & HUB_CHAR_LPSM) { |
7bf01185 AD |
1370 | case HUB_CHAR_COMMON_LPSM: |
1371 | dev_dbg(hub_dev, "ganged power switching\n"); | |
1372 | break; | |
1373 | case HUB_CHAR_INDV_PORT_LPSM: | |
1374 | dev_dbg(hub_dev, "individual port power switching\n"); | |
1375 | break; | |
1376 | case HUB_CHAR_NO_LPSM: | |
1377 | case HUB_CHAR_LPSM: | |
1378 | dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); | |
1379 | break; | |
1da177e4 LT |
1380 | } |
1381 | ||
74ad9bd2 | 1382 | switch (wHubCharacteristics & HUB_CHAR_OCPM) { |
7bf01185 AD |
1383 | case HUB_CHAR_COMMON_OCPM: |
1384 | dev_dbg(hub_dev, "global over-current protection\n"); | |
1385 | break; | |
1386 | case HUB_CHAR_INDV_PORT_OCPM: | |
1387 | dev_dbg(hub_dev, "individual port over-current protection\n"); | |
1388 | break; | |
1389 | case HUB_CHAR_NO_OCPM: | |
1390 | case HUB_CHAR_OCPM: | |
1391 | dev_dbg(hub_dev, "no over-current protection\n"); | |
1392 | break; | |
1da177e4 LT |
1393 | } |
1394 | ||
1395 | spin_lock_init (&hub->tt.lock); | |
1396 | INIT_LIST_HEAD (&hub->tt.clear_list); | |
cb88a1b8 | 1397 | INIT_WORK(&hub->tt.clear_work, hub_tt_work); |
1da177e4 | 1398 | switch (hdev->descriptor.bDeviceProtocol) { |
7bf01185 AD |
1399 | case USB_HUB_PR_FS: |
1400 | break; | |
1401 | case USB_HUB_PR_HS_SINGLE_TT: | |
1402 | dev_dbg(hub_dev, "Single TT\n"); | |
1403 | hub->tt.hub = hdev; | |
1404 | break; | |
1405 | case USB_HUB_PR_HS_MULTI_TT: | |
1406 | ret = usb_set_interface(hdev, 0, 1); | |
1407 | if (ret == 0) { | |
1408 | dev_dbg(hub_dev, "TT per port\n"); | |
1409 | hub->tt.multi = 1; | |
1410 | } else | |
1411 | dev_err(hub_dev, "Using single TT (err %d)\n", | |
1412 | ret); | |
1413 | hub->tt.hub = hdev; | |
1414 | break; | |
1415 | case USB_HUB_PR_SS: | |
1416 | /* USB 3.0 hubs don't have a TT */ | |
1417 | break; | |
1418 | default: | |
1419 | dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", | |
1420 | hdev->descriptor.bDeviceProtocol); | |
1421 | break; | |
1da177e4 LT |
1422 | } |
1423 | ||
e09711ae | 1424 | /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ |
74ad9bd2 | 1425 | switch (wHubCharacteristics & HUB_CHAR_TTTT) { |
e09711ae DB |
1426 | case HUB_TTTT_8_BITS: |
1427 | if (hdev->descriptor.bDeviceProtocol != 0) { | |
1428 | hub->tt.think_time = 666; | |
1429 | dev_dbg(hub_dev, "TT requires at most %d " | |
1430 | "FS bit times (%d ns)\n", | |
1431 | 8, hub->tt.think_time); | |
1432 | } | |
1da177e4 | 1433 | break; |
e09711ae DB |
1434 | case HUB_TTTT_16_BITS: |
1435 | hub->tt.think_time = 666 * 2; | |
1436 | dev_dbg(hub_dev, "TT requires at most %d " | |
1437 | "FS bit times (%d ns)\n", | |
1438 | 16, hub->tt.think_time); | |
1da177e4 | 1439 | break; |
e09711ae DB |
1440 | case HUB_TTTT_24_BITS: |
1441 | hub->tt.think_time = 666 * 3; | |
1442 | dev_dbg(hub_dev, "TT requires at most %d " | |
1443 | "FS bit times (%d ns)\n", | |
1444 | 24, hub->tt.think_time); | |
1da177e4 | 1445 | break; |
e09711ae DB |
1446 | case HUB_TTTT_32_BITS: |
1447 | hub->tt.think_time = 666 * 4; | |
1448 | dev_dbg(hub_dev, "TT requires at most %d " | |
1449 | "FS bit times (%d ns)\n", | |
1450 | 32, hub->tt.think_time); | |
1da177e4 LT |
1451 | break; |
1452 | } | |
1453 | ||
1454 | /* probe() zeroes hub->indicator[] */ | |
74ad9bd2 | 1455 | if (wHubCharacteristics & HUB_CHAR_PORTIND) { |
1da177e4 LT |
1456 | hub->has_indicators = 1; |
1457 | dev_dbg(hub_dev, "Port indicators are supported\n"); | |
1458 | } | |
1459 | ||
1460 | dev_dbg(hub_dev, "power on to power good time: %dms\n", | |
1461 | hub->descriptor->bPwrOn2PwrGood * 2); | |
1462 | ||
1463 | /* power budgeting mostly matters with bus-powered hubs, | |
1464 | * and battery-powered root hubs (may provide just 8 mA). | |
1465 | */ | |
1466 | ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); | |
55c52718 | 1467 | if (ret < 2) { |
1da177e4 LT |
1468 | message = "can't get hub status"; |
1469 | goto fail; | |
1470 | } | |
7d35b929 | 1471 | le16_to_cpus(&hubstatus); |
430ee58e | 1472 | hcd = bus_to_hcd(hdev->bus); |
7d35b929 | 1473 | if (hdev == hdev->bus->root_hub) { |
430ee58e SAS |
1474 | if (hcd->power_budget > 0) |
1475 | hdev->bus_mA = hcd->power_budget; | |
1476 | else | |
1477 | hdev->bus_mA = full_load * hdev->maxchild; | |
1478 | if (hdev->bus_mA >= full_load) | |
1479 | hub->mA_per_port = full_load; | |
55c52718 AS |
1480 | else { |
1481 | hub->mA_per_port = hdev->bus_mA; | |
1482 | hub->limited_power = 1; | |
1483 | } | |
7d35b929 | 1484 | } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
430ee58e SAS |
1485 | int remaining = hdev->bus_mA - |
1486 | hub->descriptor->bHubContrCurrent; | |
1487 | ||
1da177e4 LT |
1488 | dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", |
1489 | hub->descriptor->bHubContrCurrent); | |
55c52718 | 1490 | hub->limited_power = 1; |
55c52718 | 1491 | |
430ee58e SAS |
1492 | if (remaining < hdev->maxchild * unit_load) |
1493 | dev_warn(hub_dev, | |
55c52718 AS |
1494 | "insufficient power available " |
1495 | "to use all downstream ports\n"); | |
430ee58e SAS |
1496 | hub->mA_per_port = unit_load; /* 7.2.1 */ |
1497 | ||
55c52718 AS |
1498 | } else { /* Self-powered external hub */ |
1499 | /* FIXME: What about battery-powered external hubs that | |
1500 | * provide less current per port? */ | |
430ee58e | 1501 | hub->mA_per_port = full_load; |
7d35b929 | 1502 | } |
430ee58e | 1503 | if (hub->mA_per_port < full_load) |
55c52718 AS |
1504 | dev_dbg(hub_dev, "%umA bus power budget for each child\n", |
1505 | hub->mA_per_port); | |
1da177e4 | 1506 | |
b356b7c7 SS |
1507 | /* Update the HCD's internal representation of this hub before khubd |
1508 | * starts getting port status changes for devices under the hub. | |
1509 | */ | |
b356b7c7 SS |
1510 | if (hcd->driver->update_hub_device) { |
1511 | ret = hcd->driver->update_hub_device(hcd, hdev, | |
1512 | &hub->tt, GFP_KERNEL); | |
1513 | if (ret < 0) { | |
1514 | message = "can't update HCD hub info"; | |
1515 | goto fail; | |
1516 | } | |
1517 | } | |
1518 | ||
1da177e4 LT |
1519 | ret = hub_hub_status(hub, &hubstatus, &hubchange); |
1520 | if (ret < 0) { | |
1521 | message = "can't get hub status"; | |
1522 | goto fail; | |
1523 | } | |
1524 | ||
1525 | /* local power status reports aren't always correct */ | |
1526 | if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) | |
1527 | dev_dbg(hub_dev, "local power source is %s\n", | |
1528 | (hubstatus & HUB_STATUS_LOCAL_POWER) | |
1529 | ? "lost (inactive)" : "good"); | |
1530 | ||
74ad9bd2 | 1531 | if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) |
1da177e4 LT |
1532 | dev_dbg(hub_dev, "%sover-current condition exists\n", |
1533 | (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); | |
1534 | ||
88fafff9 | 1535 | /* set up the interrupt endpoint |
1536 | * We use the EP's maxpacket size instead of (PORTS+1+7)/8 | |
1537 | * bytes as USB2.0[11.12.3] says because some hubs are known | |
1538 | * to send more data (and thus cause overflow). For root hubs, | |
1539 | * maxpktsize is defined in hcd.c's fake endpoint descriptors | |
1540 | * to be big enough for at least USB_MAXCHILDREN ports. */ | |
1da177e4 LT |
1541 | pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); |
1542 | maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); | |
1543 | ||
1544 | if (maxp > sizeof(*hub->buffer)) | |
1545 | maxp = sizeof(*hub->buffer); | |
1546 | ||
1547 | hub->urb = usb_alloc_urb(0, GFP_KERNEL); | |
1548 | if (!hub->urb) { | |
1da177e4 LT |
1549 | ret = -ENOMEM; |
1550 | goto fail; | |
1551 | } | |
1552 | ||
1553 | usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, | |
1554 | hub, endpoint->bInterval); | |
1da177e4 LT |
1555 | |
1556 | /* maybe cycle the hub leds */ | |
1557 | if (hub->has_indicators && blinkenlights) | |
1558 | hub->indicator [0] = INDICATOR_CYCLE; | |
1559 | ||
fa2a9566 LT |
1560 | for (i = 0; i < hdev->maxchild; i++) |
1561 | if (usb_hub_create_port_device(hub, i + 1) < 0) | |
1562 | dev_err(hub->intfdev, | |
1563 | "couldn't create port%d device.\n", i + 1); | |
1564 | ||
d2123fd9 LT |
1565 | usb_hub_adjust_deviceremovable(hdev, hub->descriptor); |
1566 | ||
f2835219 | 1567 | hub_activate(hub, HUB_INIT); |
1da177e4 LT |
1568 | return 0; |
1569 | ||
1570 | fail: | |
1571 | dev_err (hub_dev, "config failed, %s (err %d)\n", | |
1572 | message, ret); | |
1573 | /* hub_disconnect() frees urb and descriptor */ | |
1574 | return ret; | |
1575 | } | |
1576 | ||
e8054854 AS |
1577 | static void hub_release(struct kref *kref) |
1578 | { | |
1579 | struct usb_hub *hub = container_of(kref, struct usb_hub, kref); | |
1580 | ||
1581 | usb_put_intf(to_usb_interface(hub->intfdev)); | |
1582 | kfree(hub); | |
1583 | } | |
1584 | ||
1da177e4 LT |
1585 | static unsigned highspeed_hubs; |
1586 | ||
1587 | static void hub_disconnect(struct usb_interface *intf) | |
1588 | { | |
8816230e | 1589 | struct usb_hub *hub = usb_get_intfdata(intf); |
fa286188 | 1590 | struct usb_device *hdev = interface_to_usbdev(intf); |
fa2a9566 LT |
1591 | int i; |
1592 | ||
e8054854 AS |
1593 | /* Take the hub off the event list and don't let it be added again */ |
1594 | spin_lock_irq(&hub_event_lock); | |
8e4ceb38 AS |
1595 | if (!list_empty(&hub->event_list)) { |
1596 | list_del_init(&hub->event_list); | |
1597 | usb_autopm_put_interface_no_suspend(intf); | |
1598 | } | |
e8054854 AS |
1599 | hub->disconnected = 1; |
1600 | spin_unlock_irq(&hub_event_lock); | |
1da177e4 | 1601 | |
7de18d8b AS |
1602 | /* Disconnect all children and quiesce the hub */ |
1603 | hub->error = 0; | |
4330354f | 1604 | hub_quiesce(hub, HUB_DISCONNECT); |
7de18d8b | 1605 | |
8b28c752 | 1606 | usb_set_intfdata (intf, NULL); |
1f2235b8 AS |
1607 | |
1608 | for (i = 0; i < hdev->maxchild; i++) | |
1609 | usb_hub_remove_port_device(hub, i + 1); | |
7cbe5dca | 1610 | hub->hdev->maxchild = 0; |
1da177e4 | 1611 | |
e8054854 | 1612 | if (hub->hdev->speed == USB_SPEED_HIGH) |
1da177e4 LT |
1613 | highspeed_hubs--; |
1614 | ||
1da177e4 | 1615 | usb_free_urb(hub->urb); |
fa2a9566 | 1616 | kfree(hub->ports); |
1bc3c9e1 | 1617 | kfree(hub->descriptor); |
1bc3c9e1 | 1618 | kfree(hub->status); |
d697cdda | 1619 | kfree(hub->buffer); |
1da177e4 | 1620 | |
971fcd49 | 1621 | pm_suspend_ignore_children(&intf->dev, false); |
e8054854 | 1622 | kref_put(&hub->kref, hub_release); |
1da177e4 LT |
1623 | } |
1624 | ||
1625 | static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
1626 | { | |
1627 | struct usb_host_interface *desc; | |
1628 | struct usb_endpoint_descriptor *endpoint; | |
1629 | struct usb_device *hdev; | |
1630 | struct usb_hub *hub; | |
1631 | ||
1632 | desc = intf->cur_altsetting; | |
1633 | hdev = interface_to_usbdev(intf); | |
1634 | ||
596d789a ML |
1635 | /* |
1636 | * Set default autosuspend delay as 0 to speedup bus suspend, | |
1637 | * based on the below considerations: | |
1638 | * | |
1639 | * - Unlike other drivers, the hub driver does not rely on the | |
1640 | * autosuspend delay to provide enough time to handle a wakeup | |
1641 | * event, and the submitted status URB is just to check future | |
1642 | * change on hub downstream ports, so it is safe to do it. | |
1643 | * | |
1644 | * - The patch might cause one or more auto supend/resume for | |
1645 | * below very rare devices when they are plugged into hub | |
1646 | * first time: | |
1647 | * | |
1648 | * devices having trouble initializing, and disconnect | |
1649 | * themselves from the bus and then reconnect a second | |
1650 | * or so later | |
1651 | * | |
1652 | * devices just for downloading firmware, and disconnects | |
1653 | * themselves after completing it | |
1654 | * | |
1655 | * For these quite rare devices, their drivers may change the | |
1656 | * autosuspend delay of their parent hub in the probe() to one | |
1657 | * appropriate value to avoid the subtle problem if someone | |
1658 | * does care it. | |
1659 | * | |
1660 | * - The patch may cause one or more auto suspend/resume on | |
1661 | * hub during running 'lsusb', but it is probably too | |
1662 | * infrequent to worry about. | |
1663 | * | |
1664 | * - Change autosuspend delay of hub can avoid unnecessary auto | |
1665 | * suspend timer for hub, also may decrease power consumption | |
1666 | * of USB bus. | |
1667 | */ | |
1668 | pm_runtime_set_autosuspend_delay(&hdev->dev, 0); | |
1669 | ||
2839f5bc SS |
1670 | /* Hubs have proper suspend/resume support. */ |
1671 | usb_enable_autosuspend(hdev); | |
088f7fec | 1672 | |
38f3ad5e | 1673 | if (hdev->level == MAX_TOPO_LEVEL) { |
b9cef6c3 WF |
1674 | dev_err(&intf->dev, |
1675 | "Unsupported bus topology: hub nested too deep\n"); | |
38f3ad5e FB |
1676 | return -E2BIG; |
1677 | } | |
1678 | ||
89ccbdc9 DB |
1679 | #ifdef CONFIG_USB_OTG_BLACKLIST_HUB |
1680 | if (hdev->parent) { | |
1681 | dev_warn(&intf->dev, "ignoring external hub\n"); | |
1682 | return -ENODEV; | |
1683 | } | |
1684 | #endif | |
1685 | ||
1da177e4 LT |
1686 | /* Some hubs have a subclass of 1, which AFAICT according to the */ |
1687 | /* specs is not defined, but it works */ | |
1688 | if ((desc->desc.bInterfaceSubClass != 0) && | |
1689 | (desc->desc.bInterfaceSubClass != 1)) { | |
1690 | descriptor_error: | |
1691 | dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); | |
1692 | return -EIO; | |
1693 | } | |
1694 | ||
1695 | /* Multiple endpoints? What kind of mutant ninja-hub is this? */ | |
1696 | if (desc->desc.bNumEndpoints != 1) | |
1697 | goto descriptor_error; | |
1698 | ||
1699 | endpoint = &desc->endpoint[0].desc; | |
1700 | ||
fbf81c29 LFC |
1701 | /* If it's not an interrupt in endpoint, we'd better punt! */ |
1702 | if (!usb_endpoint_is_int_in(endpoint)) | |
1da177e4 LT |
1703 | goto descriptor_error; |
1704 | ||
1705 | /* We found a hub */ | |
1706 | dev_info (&intf->dev, "USB hub found\n"); | |
1707 | ||
0a1ef3b5 | 1708 | hub = kzalloc(sizeof(*hub), GFP_KERNEL); |
1da177e4 LT |
1709 | if (!hub) { |
1710 | dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); | |
1711 | return -ENOMEM; | |
1712 | } | |
1713 | ||
e8054854 | 1714 | kref_init(&hub->kref); |
1da177e4 LT |
1715 | INIT_LIST_HEAD(&hub->event_list); |
1716 | hub->intfdev = &intf->dev; | |
1717 | hub->hdev = hdev; | |
c4028958 | 1718 | INIT_DELAYED_WORK(&hub->leds, led_work); |
8520f380 | 1719 | INIT_DELAYED_WORK(&hub->init_work, NULL); |
e8054854 | 1720 | usb_get_intf(intf); |
1da177e4 LT |
1721 | |
1722 | usb_set_intfdata (intf, hub); | |
40f122f3 | 1723 | intf->needs_remote_wakeup = 1; |
971fcd49 | 1724 | pm_suspend_ignore_children(&intf->dev, true); |
1da177e4 LT |
1725 | |
1726 | if (hdev->speed == USB_SPEED_HIGH) | |
1727 | highspeed_hubs++; | |
1728 | ||
e6f30dea ML |
1729 | if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) |
1730 | hub->quirk_check_port_auto_suspend = 1; | |
1731 | ||
1da177e4 LT |
1732 | if (hub_configure(hub, endpoint) >= 0) |
1733 | return 0; | |
1734 | ||
1735 | hub_disconnect (intf); | |
1736 | return -ENODEV; | |
1737 | } | |
1738 | ||
1739 | static int | |
1740 | hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) | |
1741 | { | |
1742 | struct usb_device *hdev = interface_to_usbdev (intf); | |
ad493e5e | 1743 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
1da177e4 LT |
1744 | |
1745 | /* assert ifno == 0 (part of hub spec) */ | |
1746 | switch (code) { | |
1747 | case USBDEVFS_HUB_PORTINFO: { | |
1748 | struct usbdevfs_hub_portinfo *info = user_data; | |
1749 | int i; | |
1750 | ||
1751 | spin_lock_irq(&device_state_lock); | |
1752 | if (hdev->devnum <= 0) | |
1753 | info->nports = 0; | |
1754 | else { | |
1755 | info->nports = hdev->maxchild; | |
1756 | for (i = 0; i < info->nports; i++) { | |
ff823c79 | 1757 | if (hub->ports[i]->child == NULL) |
1da177e4 LT |
1758 | info->port[i] = 0; |
1759 | else | |
1760 | info->port[i] = | |
ff823c79 | 1761 | hub->ports[i]->child->devnum; |
1da177e4 LT |
1762 | } |
1763 | } | |
1764 | spin_unlock_irq(&device_state_lock); | |
1765 | ||
1766 | return info->nports + 1; | |
1767 | } | |
1768 | ||
1769 | default: | |
1770 | return -ENOSYS; | |
1771 | } | |
1772 | } | |
1773 | ||
7cbe5dca AS |
1774 | /* |
1775 | * Allow user programs to claim ports on a hub. When a device is attached | |
1776 | * to one of these "claimed" ports, the program will "own" the device. | |
1777 | */ | |
1778 | static int find_port_owner(struct usb_device *hdev, unsigned port1, | |
336c5c31 | 1779 | struct dev_state ***ppowner) |
7cbe5dca | 1780 | { |
41341261 MN |
1781 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
1782 | ||
7cbe5dca AS |
1783 | if (hdev->state == USB_STATE_NOTATTACHED) |
1784 | return -ENODEV; | |
1785 | if (port1 == 0 || port1 > hdev->maxchild) | |
1786 | return -EINVAL; | |
1787 | ||
41341261 | 1788 | /* Devices not managed by the hub driver |
7cbe5dca AS |
1789 | * will always have maxchild equal to 0. |
1790 | */ | |
41341261 | 1791 | *ppowner = &(hub->ports[port1 - 1]->port_owner); |
7cbe5dca AS |
1792 | return 0; |
1793 | } | |
1794 | ||
1795 | /* In the following three functions, the caller must hold hdev's lock */ | |
336c5c31 LT |
1796 | int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, |
1797 | struct dev_state *owner) | |
7cbe5dca AS |
1798 | { |
1799 | int rc; | |
336c5c31 | 1800 | struct dev_state **powner; |
7cbe5dca AS |
1801 | |
1802 | rc = find_port_owner(hdev, port1, &powner); | |
1803 | if (rc) | |
1804 | return rc; | |
1805 | if (*powner) | |
1806 | return -EBUSY; | |
1807 | *powner = owner; | |
1808 | return rc; | |
1809 | } | |
1810 | ||
336c5c31 LT |
1811 | int usb_hub_release_port(struct usb_device *hdev, unsigned port1, |
1812 | struct dev_state *owner) | |
7cbe5dca AS |
1813 | { |
1814 | int rc; | |
336c5c31 | 1815 | struct dev_state **powner; |
7cbe5dca AS |
1816 | |
1817 | rc = find_port_owner(hdev, port1, &powner); | |
1818 | if (rc) | |
1819 | return rc; | |
1820 | if (*powner != owner) | |
1821 | return -ENOENT; | |
1822 | *powner = NULL; | |
1823 | return rc; | |
1824 | } | |
1825 | ||
336c5c31 | 1826 | void usb_hub_release_all_ports(struct usb_device *hdev, struct dev_state *owner) |
7cbe5dca | 1827 | { |
ad493e5e | 1828 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
7cbe5dca | 1829 | int n; |
7cbe5dca | 1830 | |
fa2a9566 LT |
1831 | for (n = 0; n < hdev->maxchild; n++) { |
1832 | if (hub->ports[n]->port_owner == owner) | |
1833 | hub->ports[n]->port_owner = NULL; | |
7cbe5dca | 1834 | } |
fa2a9566 | 1835 | |
7cbe5dca AS |
1836 | } |
1837 | ||
1838 | /* The caller must hold udev's lock */ | |
1839 | bool usb_device_is_owned(struct usb_device *udev) | |
1840 | { | |
1841 | struct usb_hub *hub; | |
1842 | ||
1843 | if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) | |
1844 | return false; | |
ad493e5e | 1845 | hub = usb_hub_to_struct_hub(udev->parent); |
fa2a9566 | 1846 | return !!hub->ports[udev->portnum - 1]->port_owner; |
7cbe5dca AS |
1847 | } |
1848 | ||
1da177e4 LT |
1849 | static void recursively_mark_NOTATTACHED(struct usb_device *udev) |
1850 | { | |
ad493e5e | 1851 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); |
1da177e4 LT |
1852 | int i; |
1853 | ||
1854 | for (i = 0; i < udev->maxchild; ++i) { | |
ff823c79 LT |
1855 | if (hub->ports[i]->child) |
1856 | recursively_mark_NOTATTACHED(hub->ports[i]->child); | |
1da177e4 | 1857 | } |
9bbdf1e0 | 1858 | if (udev->state == USB_STATE_SUSPENDED) |
15123006 | 1859 | udev->active_duration -= jiffies; |
1da177e4 LT |
1860 | udev->state = USB_STATE_NOTATTACHED; |
1861 | } | |
1862 | ||
1863 | /** | |
1864 | * usb_set_device_state - change a device's current state (usbcore, hcds) | |
1865 | * @udev: pointer to device whose state should be changed | |
1866 | * @new_state: new state value to be stored | |
1867 | * | |
1868 | * udev->state is _not_ fully protected by the device lock. Although | |
1869 | * most transitions are made only while holding the lock, the state can | |
1870 | * can change to USB_STATE_NOTATTACHED at almost any time. This | |
1871 | * is so that devices can be marked as disconnected as soon as possible, | |
1872 | * without having to wait for any semaphores to be released. As a result, | |
1873 | * all changes to any device's state must be protected by the | |
1874 | * device_state_lock spinlock. | |
1875 | * | |
1876 | * Once a device has been added to the device tree, all changes to its state | |
1877 | * should be made using this routine. The state should _not_ be set directly. | |
1878 | * | |
1879 | * If udev->state is already USB_STATE_NOTATTACHED then no change is made. | |
1880 | * Otherwise udev->state is set to new_state, and if new_state is | |
1881 | * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set | |
1882 | * to USB_STATE_NOTATTACHED. | |
1883 | */ | |
1884 | void usb_set_device_state(struct usb_device *udev, | |
1885 | enum usb_device_state new_state) | |
1886 | { | |
1887 | unsigned long flags; | |
4681b171 | 1888 | int wakeup = -1; |
1da177e4 LT |
1889 | |
1890 | spin_lock_irqsave(&device_state_lock, flags); | |
1891 | if (udev->state == USB_STATE_NOTATTACHED) | |
1892 | ; /* do nothing */ | |
b94dc6b5 | 1893 | else if (new_state != USB_STATE_NOTATTACHED) { |
fb669cc0 DB |
1894 | |
1895 | /* root hub wakeup capabilities are managed out-of-band | |
1896 | * and may involve silicon errata ... ignore them here. | |
1897 | */ | |
1898 | if (udev->parent) { | |
645daaab AS |
1899 | if (udev->state == USB_STATE_SUSPENDED |
1900 | || new_state == USB_STATE_SUSPENDED) | |
1901 | ; /* No change to wakeup settings */ | |
1902 | else if (new_state == USB_STATE_CONFIGURED) | |
4681b171 RW |
1903 | wakeup = udev->actconfig->desc.bmAttributes |
1904 | & USB_CONFIG_ATT_WAKEUP; | |
645daaab | 1905 | else |
4681b171 | 1906 | wakeup = 0; |
fb669cc0 | 1907 | } |
15123006 SS |
1908 | if (udev->state == USB_STATE_SUSPENDED && |
1909 | new_state != USB_STATE_SUSPENDED) | |
1910 | udev->active_duration -= jiffies; | |
1911 | else if (new_state == USB_STATE_SUSPENDED && | |
1912 | udev->state != USB_STATE_SUSPENDED) | |
1913 | udev->active_duration += jiffies; | |
645daaab | 1914 | udev->state = new_state; |
b94dc6b5 | 1915 | } else |
1da177e4 LT |
1916 | recursively_mark_NOTATTACHED(udev); |
1917 | spin_unlock_irqrestore(&device_state_lock, flags); | |
4681b171 RW |
1918 | if (wakeup >= 0) |
1919 | device_set_wakeup_capable(&udev->dev, wakeup); | |
1da177e4 | 1920 | } |
6da9c990 | 1921 | EXPORT_SYMBOL_GPL(usb_set_device_state); |
1da177e4 | 1922 | |
8af548dc | 1923 | /* |
3b29b68b AS |
1924 | * Choose a device number. |
1925 | * | |
1926 | * Device numbers are used as filenames in usbfs. On USB-1.1 and | |
1927 | * USB-2.0 buses they are also used as device addresses, however on | |
1928 | * USB-3.0 buses the address is assigned by the controller hardware | |
1929 | * and it usually is not the same as the device number. | |
1930 | * | |
8af548dc IPG |
1931 | * WUSB devices are simple: they have no hubs behind, so the mapping |
1932 | * device <-> virtual port number becomes 1:1. Why? to simplify the | |
1933 | * life of the device connection logic in | |
1934 | * drivers/usb/wusbcore/devconnect.c. When we do the initial secret | |
1935 | * handshake we need to assign a temporary address in the unauthorized | |
1936 | * space. For simplicity we use the first virtual port number found to | |
1937 | * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] | |
1938 | * and that becomes it's address [X < 128] or its unauthorized address | |
1939 | * [X | 0x80]. | |
1940 | * | |
1941 | * We add 1 as an offset to the one-based USB-stack port number | |
1942 | * (zero-based wusb virtual port index) for two reasons: (a) dev addr | |
1943 | * 0 is reserved by USB for default address; (b) Linux's USB stack | |
1944 | * uses always #1 for the root hub of the controller. So USB stack's | |
1945 | * port #1, which is wusb virtual-port #0 has address #2. | |
c6515272 SS |
1946 | * |
1947 | * Devices connected under xHCI are not as simple. The host controller | |
1948 | * supports virtualization, so the hardware assigns device addresses and | |
1949 | * the HCD must setup data structures before issuing a set address | |
1950 | * command to the hardware. | |
8af548dc | 1951 | */ |
3b29b68b | 1952 | static void choose_devnum(struct usb_device *udev) |
1da177e4 LT |
1953 | { |
1954 | int devnum; | |
1955 | struct usb_bus *bus = udev->bus; | |
1956 | ||
1957 | /* If khubd ever becomes multithreaded, this will need a lock */ | |
8af548dc IPG |
1958 | if (udev->wusb) { |
1959 | devnum = udev->portnum + 1; | |
1960 | BUG_ON(test_bit(devnum, bus->devmap.devicemap)); | |
1961 | } else { | |
1962 | /* Try to allocate the next devnum beginning at | |
1963 | * bus->devnum_next. */ | |
1964 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, | |
1965 | bus->devnum_next); | |
1966 | if (devnum >= 128) | |
1967 | devnum = find_next_zero_bit(bus->devmap.devicemap, | |
1968 | 128, 1); | |
1969 | bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); | |
1970 | } | |
1da177e4 LT |
1971 | if (devnum < 128) { |
1972 | set_bit(devnum, bus->devmap.devicemap); | |
1973 | udev->devnum = devnum; | |
1974 | } | |
1975 | } | |
1976 | ||
3b29b68b | 1977 | static void release_devnum(struct usb_device *udev) |
1da177e4 LT |
1978 | { |
1979 | if (udev->devnum > 0) { | |
1980 | clear_bit(udev->devnum, udev->bus->devmap.devicemap); | |
1981 | udev->devnum = -1; | |
1982 | } | |
1983 | } | |
1984 | ||
3b29b68b | 1985 | static void update_devnum(struct usb_device *udev, int devnum) |
4953d141 DV |
1986 | { |
1987 | /* The address for a WUSB device is managed by wusbcore. */ | |
1988 | if (!udev->wusb) | |
1989 | udev->devnum = devnum; | |
1990 | } | |
1991 | ||
f7410ced HX |
1992 | static void hub_free_dev(struct usb_device *udev) |
1993 | { | |
1994 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
1995 | ||
1996 | /* Root hubs aren't real devices, so don't free HCD resources */ | |
1997 | if (hcd->driver->free_dev && udev->parent) | |
1998 | hcd->driver->free_dev(hcd, udev); | |
1999 | } | |
2000 | ||
1da177e4 LT |
2001 | /** |
2002 | * usb_disconnect - disconnect a device (usbcore-internal) | |
2003 | * @pdev: pointer to device being disconnected | |
2004 | * Context: !in_interrupt () | |
2005 | * | |
2006 | * Something got disconnected. Get rid of it and all of its children. | |
2007 | * | |
2008 | * If *pdev is a normal device then the parent hub must already be locked. | |
2009 | * If *pdev is a root hub then this routine will acquire the | |
2010 | * usb_bus_list_lock on behalf of the caller. | |
2011 | * | |
2012 | * Only hub drivers (including virtual root hub drivers for host | |
2013 | * controllers) should ever call this. | |
2014 | * | |
2015 | * This call is synchronous, and may not be used in an interrupt context. | |
2016 | */ | |
2017 | void usb_disconnect(struct usb_device **pdev) | |
2018 | { | |
2019 | struct usb_device *udev = *pdev; | |
ad493e5e | 2020 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); |
1da177e4 LT |
2021 | int i; |
2022 | ||
1da177e4 LT |
2023 | /* mark the device as inactive, so any further urb submissions for |
2024 | * this device (and any of its children) will fail immediately. | |
25985edc | 2025 | * this quiesces everything except pending urbs. |
1da177e4 LT |
2026 | */ |
2027 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
3b29b68b AS |
2028 | dev_info(&udev->dev, "USB disconnect, device number %d\n", |
2029 | udev->devnum); | |
1da177e4 | 2030 | |
9ad3d6cc AS |
2031 | usb_lock_device(udev); |
2032 | ||
1da177e4 | 2033 | /* Free up all the children before we remove this device */ |
8816230e | 2034 | for (i = 0; i < udev->maxchild; i++) { |
ff823c79 LT |
2035 | if (hub->ports[i]->child) |
2036 | usb_disconnect(&hub->ports[i]->child); | |
1da177e4 LT |
2037 | } |
2038 | ||
2039 | /* deallocate hcd/hardware state ... nuking all pending urbs and | |
2040 | * cleaning up all state associated with the current configuration | |
2041 | * so that the hardware is now fully quiesced. | |
2042 | */ | |
782da727 | 2043 | dev_dbg (&udev->dev, "unregistering device\n"); |
1da177e4 | 2044 | usb_disable_device(udev, 0); |
cde217a5 | 2045 | usb_hcd_synchronize_unlinks(udev); |
1da177e4 | 2046 | |
fde26380 | 2047 | if (udev->parent) { |
ad493e5e LT |
2048 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
2049 | struct usb_port *port_dev = hub->ports[udev->portnum - 1]; | |
fde26380 LT |
2050 | |
2051 | sysfs_remove_link(&udev->dev.kobj, "port"); | |
2052 | sysfs_remove_link(&port_dev->dev.kobj, "device"); | |
971fcd49 | 2053 | |
ad493e5e LT |
2054 | if (!port_dev->did_runtime_put) |
2055 | pm_runtime_put(&port_dev->dev); | |
2056 | else | |
2057 | port_dev->did_runtime_put = false; | |
fde26380 LT |
2058 | } |
2059 | ||
3b23dd6f | 2060 | usb_remove_ep_devs(&udev->ep0); |
782da727 AS |
2061 | usb_unlock_device(udev); |
2062 | ||
2063 | /* Unregister the device. The device driver is responsible | |
3b23dd6f AS |
2064 | * for de-configuring the device and invoking the remove-device |
2065 | * notifier chain (used by usbfs and possibly others). | |
782da727 AS |
2066 | */ |
2067 | device_del(&udev->dev); | |
3099e75a | 2068 | |
782da727 | 2069 | /* Free the device number and delete the parent's children[] |
1da177e4 LT |
2070 | * (or root_hub) pointer. |
2071 | */ | |
3b29b68b | 2072 | release_devnum(udev); |
1da177e4 LT |
2073 | |
2074 | /* Avoid races with recursively_mark_NOTATTACHED() */ | |
2075 | spin_lock_irq(&device_state_lock); | |
2076 | *pdev = NULL; | |
2077 | spin_unlock_irq(&device_state_lock); | |
2078 | ||
f7410ced HX |
2079 | hub_free_dev(udev); |
2080 | ||
782da727 | 2081 | put_device(&udev->dev); |
1da177e4 LT |
2082 | } |
2083 | ||
f2a383e4 | 2084 | #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES |
1da177e4 LT |
2085 | static void show_string(struct usb_device *udev, char *id, char *string) |
2086 | { | |
2087 | if (!string) | |
2088 | return; | |
f2ec522e | 2089 | dev_info(&udev->dev, "%s: %s\n", id, string); |
1da177e4 LT |
2090 | } |
2091 | ||
f2a383e4 GKH |
2092 | static void announce_device(struct usb_device *udev) |
2093 | { | |
2094 | dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", | |
2095 | le16_to_cpu(udev->descriptor.idVendor), | |
2096 | le16_to_cpu(udev->descriptor.idProduct)); | |
b9cef6c3 WF |
2097 | dev_info(&udev->dev, |
2098 | "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", | |
f2a383e4 GKH |
2099 | udev->descriptor.iManufacturer, |
2100 | udev->descriptor.iProduct, | |
2101 | udev->descriptor.iSerialNumber); | |
2102 | show_string(udev, "Product", udev->product); | |
2103 | show_string(udev, "Manufacturer", udev->manufacturer); | |
2104 | show_string(udev, "SerialNumber", udev->serial); | |
2105 | } | |
1da177e4 | 2106 | #else |
f2a383e4 | 2107 | static inline void announce_device(struct usb_device *udev) { } |
1da177e4 LT |
2108 | #endif |
2109 | ||
1da177e4 LT |
2110 | #ifdef CONFIG_USB_OTG |
2111 | #include "otg_whitelist.h" | |
2112 | #endif | |
2113 | ||
3ede760f | 2114 | /** |
8d8558d1 | 2115 | * usb_enumerate_device_otg - FIXME (usbcore-internal) |
3ede760f ON |
2116 | * @udev: newly addressed device (in ADDRESS state) |
2117 | * | |
8d8558d1 | 2118 | * Finish enumeration for On-The-Go devices |
3ede760f | 2119 | */ |
8d8558d1 | 2120 | static int usb_enumerate_device_otg(struct usb_device *udev) |
1da177e4 | 2121 | { |
d9d16e8a | 2122 | int err = 0; |
1da177e4 LT |
2123 | |
2124 | #ifdef CONFIG_USB_OTG | |
2125 | /* | |
2126 | * OTG-aware devices on OTG-capable root hubs may be able to use SRP, | |
2127 | * to wake us after we've powered off VBUS; and HNP, switching roles | |
2128 | * "host" to "peripheral". The OTG descriptor helps figure this out. | |
2129 | */ | |
2130 | if (!udev->bus->is_b_host | |
2131 | && udev->config | |
2132 | && udev->parent == udev->bus->root_hub) { | |
2eb5052e | 2133 | struct usb_otg_descriptor *desc = NULL; |
1da177e4 LT |
2134 | struct usb_bus *bus = udev->bus; |
2135 | ||
2136 | /* descriptor may appear anywhere in config */ | |
2137 | if (__usb_get_extra_descriptor (udev->rawdescriptors[0], | |
2138 | le16_to_cpu(udev->config[0].desc.wTotalLength), | |
2139 | USB_DT_OTG, (void **) &desc) == 0) { | |
2140 | if (desc->bmAttributes & USB_OTG_HNP) { | |
12c3da34 | 2141 | unsigned port1 = udev->portnum; |
fc849b85 | 2142 | |
1da177e4 LT |
2143 | dev_info(&udev->dev, |
2144 | "Dual-Role OTG device on %sHNP port\n", | |
2145 | (port1 == bus->otg_port) | |
2146 | ? "" : "non-"); | |
2147 | ||
2148 | /* enable HNP before suspend, it's simpler */ | |
2149 | if (port1 == bus->otg_port) | |
2150 | bus->b_hnp_enable = 1; | |
2151 | err = usb_control_msg(udev, | |
2152 | usb_sndctrlpipe(udev, 0), | |
2153 | USB_REQ_SET_FEATURE, 0, | |
2154 | bus->b_hnp_enable | |
2155 | ? USB_DEVICE_B_HNP_ENABLE | |
2156 | : USB_DEVICE_A_ALT_HNP_SUPPORT, | |
2157 | 0, NULL, 0, USB_CTRL_SET_TIMEOUT); | |
2158 | if (err < 0) { | |
2159 | /* OTG MESSAGE: report errors here, | |
2160 | * customize to match your product. | |
2161 | */ | |
2162 | dev_info(&udev->dev, | |
b9cef6c3 | 2163 | "can't set HNP mode: %d\n", |
1da177e4 LT |
2164 | err); |
2165 | bus->b_hnp_enable = 0; | |
2166 | } | |
2167 | } | |
2168 | } | |
2169 | } | |
2170 | ||
2171 | if (!is_targeted(udev)) { | |
2172 | ||
2173 | /* Maybe it can talk to us, though we can't talk to it. | |
2174 | * (Includes HNP test device.) | |
2175 | */ | |
2176 | if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { | |
634a84f8 | 2177 | err = usb_port_suspend(udev, PMSG_SUSPEND); |
1da177e4 LT |
2178 | if (err < 0) |
2179 | dev_dbg(&udev->dev, "HNP fail, %d\n", err); | |
2180 | } | |
ffcdc18d | 2181 | err = -ENOTSUPP; |
1da177e4 LT |
2182 | goto fail; |
2183 | } | |
d9d16e8a | 2184 | fail: |
1da177e4 | 2185 | #endif |
d9d16e8a IPG |
2186 | return err; |
2187 | } | |
2188 | ||
2189 | ||
2190 | /** | |
8d8558d1 | 2191 | * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) |
d9d16e8a IPG |
2192 | * @udev: newly addressed device (in ADDRESS state) |
2193 | * | |
2194 | * This is only called by usb_new_device() and usb_authorize_device() | |
2195 | * and FIXME -- all comments that apply to them apply here wrt to | |
2196 | * environment. | |
2197 | * | |
2198 | * If the device is WUSB and not authorized, we don't attempt to read | |
2199 | * the string descriptors, as they will be errored out by the device | |
2200 | * until it has been authorized. | |
2201 | */ | |
8d8558d1 | 2202 | static int usb_enumerate_device(struct usb_device *udev) |
d9d16e8a IPG |
2203 | { |
2204 | int err; | |
1da177e4 | 2205 | |
d9d16e8a IPG |
2206 | if (udev->config == NULL) { |
2207 | err = usb_get_configuration(udev); | |
2208 | if (err < 0) { | |
e9e88fb7 AS |
2209 | if (err != -ENODEV) |
2210 | dev_err(&udev->dev, "can't read configurations, error %d\n", | |
2211 | err); | |
80da2e0d | 2212 | return err; |
d9d16e8a IPG |
2213 | } |
2214 | } | |
2215 | if (udev->wusb == 1 && udev->authorized == 0) { | |
2216 | udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
2217 | udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
2218 | udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
2219 | } | |
2220 | else { | |
2221 | /* read the standard strings and cache them if present */ | |
2222 | udev->product = usb_cache_string(udev, udev->descriptor.iProduct); | |
2223 | udev->manufacturer = usb_cache_string(udev, | |
2224 | udev->descriptor.iManufacturer); | |
2225 | udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); | |
2226 | } | |
8d8558d1 | 2227 | err = usb_enumerate_device_otg(udev); |
80da2e0d LP |
2228 | if (err < 0) |
2229 | return err; | |
2230 | ||
2231 | usb_detect_interface_quirks(udev); | |
2232 | ||
2233 | return 0; | |
d9d16e8a IPG |
2234 | } |
2235 | ||
d35e70d5 MG |
2236 | static void set_usb_port_removable(struct usb_device *udev) |
2237 | { | |
2238 | struct usb_device *hdev = udev->parent; | |
2239 | struct usb_hub *hub; | |
2240 | u8 port = udev->portnum; | |
2241 | u16 wHubCharacteristics; | |
2242 | bool removable = true; | |
2243 | ||
2244 | if (!hdev) | |
2245 | return; | |
2246 | ||
ad493e5e | 2247 | hub = usb_hub_to_struct_hub(udev->parent); |
d35e70d5 MG |
2248 | |
2249 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); | |
2250 | ||
2251 | if (!(wHubCharacteristics & HUB_CHAR_COMPOUND)) | |
2252 | return; | |
2253 | ||
2254 | if (hub_is_superspeed(hdev)) { | |
ca3c1539 LT |
2255 | if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable) |
2256 | & (1 << port)) | |
d35e70d5 MG |
2257 | removable = false; |
2258 | } else { | |
2259 | if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8))) | |
2260 | removable = false; | |
2261 | } | |
2262 | ||
2263 | if (removable) | |
2264 | udev->removable = USB_DEVICE_REMOVABLE; | |
2265 | else | |
2266 | udev->removable = USB_DEVICE_FIXED; | |
2267 | } | |
d9d16e8a IPG |
2268 | |
2269 | /** | |
2270 | * usb_new_device - perform initial device setup (usbcore-internal) | |
2271 | * @udev: newly addressed device (in ADDRESS state) | |
2272 | * | |
8d8558d1 AS |
2273 | * This is called with devices which have been detected but not fully |
2274 | * enumerated. The device descriptor is available, but not descriptors | |
d9d16e8a IPG |
2275 | * for any device configuration. The caller must have locked either |
2276 | * the parent hub (if udev is a normal device) or else the | |
2277 | * usb_bus_list_lock (if udev is a root hub). The parent's pointer to | |
2278 | * udev has already been installed, but udev is not yet visible through | |
2279 | * sysfs or other filesystem code. | |
2280 | * | |
2281 | * It will return if the device is configured properly or not. Zero if | |
2282 | * the interface was registered with the driver core; else a negative | |
2283 | * errno value. | |
2284 | * | |
2285 | * This call is synchronous, and may not be used in an interrupt context. | |
2286 | * | |
2287 | * Only the hub driver or root-hub registrar should ever call this. | |
2288 | */ | |
2289 | int usb_new_device(struct usb_device *udev) | |
2290 | { | |
2291 | int err; | |
2292 | ||
16985408 | 2293 | if (udev->parent) { |
16985408 DS |
2294 | /* Initialize non-root-hub device wakeup to disabled; |
2295 | * device (un)configuration controls wakeup capable | |
2296 | * sysfs power/wakeup controls wakeup enabled/disabled | |
2297 | */ | |
2298 | device_init_wakeup(&udev->dev, 0); | |
16985408 DS |
2299 | } |
2300 | ||
9bbdf1e0 AS |
2301 | /* Tell the runtime-PM framework the device is active */ |
2302 | pm_runtime_set_active(&udev->dev); | |
c08512c7 | 2303 | pm_runtime_get_noresume(&udev->dev); |
fcc4a01e | 2304 | pm_runtime_use_autosuspend(&udev->dev); |
9bbdf1e0 AS |
2305 | pm_runtime_enable(&udev->dev); |
2306 | ||
c08512c7 AS |
2307 | /* By default, forbid autosuspend for all devices. It will be |
2308 | * allowed for hubs during binding. | |
2309 | */ | |
2310 | usb_disable_autosuspend(udev); | |
2311 | ||
8d8558d1 | 2312 | err = usb_enumerate_device(udev); /* Read descriptors */ |
d9d16e8a IPG |
2313 | if (err < 0) |
2314 | goto fail; | |
c6515272 SS |
2315 | dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", |
2316 | udev->devnum, udev->bus->busnum, | |
2317 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
9f8b17e6 KS |
2318 | /* export the usbdev device-node for libusb */ |
2319 | udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, | |
2320 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
2321 | ||
6cd13201 AS |
2322 | /* Tell the world! */ |
2323 | announce_device(udev); | |
195af2cc | 2324 | |
b04b3156 TT |
2325 | if (udev->serial) |
2326 | add_device_randomness(udev->serial, strlen(udev->serial)); | |
2327 | if (udev->product) | |
2328 | add_device_randomness(udev->product, strlen(udev->product)); | |
2329 | if (udev->manufacturer) | |
2330 | add_device_randomness(udev->manufacturer, | |
2331 | strlen(udev->manufacturer)); | |
2332 | ||
927bc916 | 2333 | device_enable_async_suspend(&udev->dev); |
d35e70d5 MG |
2334 | |
2335 | /* | |
2336 | * check whether the hub marks this port as non-removable. Do it | |
2337 | * now so that platform-specific data can override it in | |
2338 | * device_add() | |
2339 | */ | |
2340 | if (udev->parent) | |
2341 | set_usb_port_removable(udev); | |
2342 | ||
782da727 | 2343 | /* Register the device. The device driver is responsible |
3b23dd6f AS |
2344 | * for configuring the device and invoking the add-device |
2345 | * notifier chain (used by usbfs and possibly others). | |
782da727 | 2346 | */ |
9f8b17e6 | 2347 | err = device_add(&udev->dev); |
1da177e4 LT |
2348 | if (err) { |
2349 | dev_err(&udev->dev, "can't device_add, error %d\n", err); | |
2350 | goto fail; | |
2351 | } | |
9ad3d6cc | 2352 | |
fde26380 LT |
2353 | /* Create link files between child device and usb port device. */ |
2354 | if (udev->parent) { | |
ad493e5e LT |
2355 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
2356 | struct usb_port *port_dev = hub->ports[udev->portnum - 1]; | |
fde26380 LT |
2357 | |
2358 | err = sysfs_create_link(&udev->dev.kobj, | |
2359 | &port_dev->dev.kobj, "port"); | |
2360 | if (err) | |
2361 | goto fail; | |
2362 | ||
2363 | err = sysfs_create_link(&port_dev->dev.kobj, | |
2364 | &udev->dev.kobj, "device"); | |
2365 | if (err) { | |
2366 | sysfs_remove_link(&udev->dev.kobj, "port"); | |
2367 | goto fail; | |
2368 | } | |
971fcd49 LT |
2369 | |
2370 | pm_runtime_get_sync(&port_dev->dev); | |
fde26380 LT |
2371 | } |
2372 | ||
3b23dd6f | 2373 | (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); |
c08512c7 AS |
2374 | usb_mark_last_busy(udev); |
2375 | pm_runtime_put_sync_autosuspend(&udev->dev); | |
c066475e | 2376 | return err; |
1da177e4 LT |
2377 | |
2378 | fail: | |
2379 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
9bbdf1e0 AS |
2380 | pm_runtime_disable(&udev->dev); |
2381 | pm_runtime_set_suspended(&udev->dev); | |
d9d16e8a | 2382 | return err; |
1da177e4 LT |
2383 | } |
2384 | ||
93993a0a IPG |
2385 | |
2386 | /** | |
fd39c86b RD |
2387 | * usb_deauthorize_device - deauthorize a device (usbcore-internal) |
2388 | * @usb_dev: USB device | |
2389 | * | |
2390 | * Move the USB device to a very basic state where interfaces are disabled | |
2391 | * and the device is in fact unconfigured and unusable. | |
93993a0a IPG |
2392 | * |
2393 | * We share a lock (that we have) with device_del(), so we need to | |
2394 | * defer its call. | |
2395 | */ | |
2396 | int usb_deauthorize_device(struct usb_device *usb_dev) | |
2397 | { | |
93993a0a IPG |
2398 | usb_lock_device(usb_dev); |
2399 | if (usb_dev->authorized == 0) | |
2400 | goto out_unauthorized; | |
da307123 | 2401 | |
93993a0a IPG |
2402 | usb_dev->authorized = 0; |
2403 | usb_set_configuration(usb_dev, -1); | |
da307123 AS |
2404 | |
2405 | kfree(usb_dev->product); | |
93993a0a | 2406 | usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
da307123 | 2407 | kfree(usb_dev->manufacturer); |
93993a0a | 2408 | usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
da307123 | 2409 | kfree(usb_dev->serial); |
93993a0a | 2410 | usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
da307123 AS |
2411 | |
2412 | usb_destroy_configuration(usb_dev); | |
93993a0a | 2413 | usb_dev->descriptor.bNumConfigurations = 0; |
da307123 | 2414 | |
93993a0a IPG |
2415 | out_unauthorized: |
2416 | usb_unlock_device(usb_dev); | |
2417 | return 0; | |
2418 | } | |
2419 | ||
2420 | ||
2421 | int usb_authorize_device(struct usb_device *usb_dev) | |
2422 | { | |
2423 | int result = 0, c; | |
da307123 | 2424 | |
93993a0a IPG |
2425 | usb_lock_device(usb_dev); |
2426 | if (usb_dev->authorized == 1) | |
2427 | goto out_authorized; | |
da307123 | 2428 | |
93993a0a IPG |
2429 | result = usb_autoresume_device(usb_dev); |
2430 | if (result < 0) { | |
2431 | dev_err(&usb_dev->dev, | |
2432 | "can't autoresume for authorization: %d\n", result); | |
2433 | goto error_autoresume; | |
2434 | } | |
2435 | result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); | |
2436 | if (result < 0) { | |
2437 | dev_err(&usb_dev->dev, "can't re-read device descriptor for " | |
2438 | "authorization: %d\n", result); | |
2439 | goto error_device_descriptor; | |
2440 | } | |
da307123 AS |
2441 | |
2442 | kfree(usb_dev->product); | |
2443 | usb_dev->product = NULL; | |
2444 | kfree(usb_dev->manufacturer); | |
2445 | usb_dev->manufacturer = NULL; | |
2446 | kfree(usb_dev->serial); | |
2447 | usb_dev->serial = NULL; | |
2448 | ||
93993a0a | 2449 | usb_dev->authorized = 1; |
8d8558d1 | 2450 | result = usb_enumerate_device(usb_dev); |
93993a0a | 2451 | if (result < 0) |
8d8558d1 | 2452 | goto error_enumerate; |
93993a0a IPG |
2453 | /* Choose and set the configuration. This registers the interfaces |
2454 | * with the driver core and lets interface drivers bind to them. | |
2455 | */ | |
b5ea060f | 2456 | c = usb_choose_configuration(usb_dev); |
93993a0a IPG |
2457 | if (c >= 0) { |
2458 | result = usb_set_configuration(usb_dev, c); | |
2459 | if (result) { | |
2460 | dev_err(&usb_dev->dev, | |
2461 | "can't set config #%d, error %d\n", c, result); | |
2462 | /* This need not be fatal. The user can try to | |
2463 | * set other configurations. */ | |
2464 | } | |
2465 | } | |
2466 | dev_info(&usb_dev->dev, "authorized to connect\n"); | |
da307123 | 2467 | |
8d8558d1 | 2468 | error_enumerate: |
93993a0a | 2469 | error_device_descriptor: |
da307123 | 2470 | usb_autosuspend_device(usb_dev); |
93993a0a IPG |
2471 | error_autoresume: |
2472 | out_authorized: | |
2473 | usb_unlock_device(usb_dev); // complements locktree | |
2474 | return result; | |
2475 | } | |
2476 | ||
2477 | ||
0165de09 IPG |
2478 | /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ |
2479 | static unsigned hub_is_wusb(struct usb_hub *hub) | |
2480 | { | |
2481 | struct usb_hcd *hcd; | |
2482 | if (hub->hdev->parent != NULL) /* not a root hub? */ | |
2483 | return 0; | |
2484 | hcd = container_of(hub->hdev->bus, struct usb_hcd, self); | |
2485 | return hcd->wireless; | |
2486 | } | |
2487 | ||
2488 | ||
1da177e4 LT |
2489 | #define PORT_RESET_TRIES 5 |
2490 | #define SET_ADDRESS_TRIES 2 | |
2491 | #define GET_DESCRIPTOR_TRIES 2 | |
2492 | #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) | |
90ab5ee9 | 2493 | #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first) |
1da177e4 LT |
2494 | |
2495 | #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ | |
2496 | #define HUB_SHORT_RESET_TIME 10 | |
75d7cf72 | 2497 | #define HUB_BH_RESET_TIME 50 |
1da177e4 | 2498 | #define HUB_LONG_RESET_TIME 200 |
77c7f072 | 2499 | #define HUB_RESET_TIMEOUT 800 |
1da177e4 | 2500 | |
10d674a8 SS |
2501 | static int hub_port_reset(struct usb_hub *hub, int port1, |
2502 | struct usb_device *udev, unsigned int delay, bool warm); | |
2503 | ||
8bea2bd3 SL |
2504 | /* Is a USB 3.0 port in the Inactive or Complinance Mode state? |
2505 | * Port worm reset is required to recover | |
2506 | */ | |
2507 | static bool hub_port_warm_reset_required(struct usb_hub *hub, u16 portstatus) | |
10d674a8 SS |
2508 | { |
2509 | return hub_is_superspeed(hub->hdev) && | |
8bea2bd3 SL |
2510 | (((portstatus & USB_PORT_STAT_LINK_STATE) == |
2511 | USB_SS_PORT_LS_SS_INACTIVE) || | |
2512 | ((portstatus & USB_PORT_STAT_LINK_STATE) == | |
2513 | USB_SS_PORT_LS_COMP_MOD)) ; | |
10d674a8 SS |
2514 | } |
2515 | ||
1da177e4 | 2516 | static int hub_port_wait_reset(struct usb_hub *hub, int port1, |
75d7cf72 | 2517 | struct usb_device *udev, unsigned int delay, bool warm) |
1da177e4 LT |
2518 | { |
2519 | int delay_time, ret; | |
2520 | u16 portstatus; | |
2521 | u16 portchange; | |
2522 | ||
2523 | for (delay_time = 0; | |
2524 | delay_time < HUB_RESET_TIMEOUT; | |
2525 | delay_time += delay) { | |
2526 | /* wait to give the device a chance to reset */ | |
2527 | msleep(delay); | |
2528 | ||
2529 | /* read and decode port status */ | |
2530 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
2531 | if (ret < 0) | |
2532 | return ret; | |
2533 | ||
4f43447e | 2534 | /* The port state is unknown until the reset completes. */ |
470f0be8 SS |
2535 | if (!(portstatus & USB_PORT_STAT_RESET)) |
2536 | break; | |
1da177e4 LT |
2537 | |
2538 | /* switch to the long delay after two short delay failures */ | |
2539 | if (delay_time >= 2 * HUB_SHORT_RESET_TIME) | |
2540 | delay = HUB_LONG_RESET_TIME; | |
2541 | ||
2542 | dev_dbg (hub->intfdev, | |
75d7cf72 AX |
2543 | "port %d not %sreset yet, waiting %dms\n", |
2544 | port1, warm ? "warm " : "", delay); | |
1da177e4 LT |
2545 | } |
2546 | ||
470f0be8 SS |
2547 | if ((portstatus & USB_PORT_STAT_RESET)) |
2548 | return -EBUSY; | |
2549 | ||
2550 | if (hub_port_warm_reset_required(hub, portstatus)) | |
2551 | return -ENOTCONN; | |
2552 | ||
2553 | /* Device went away? */ | |
2554 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) | |
2555 | return -ENOTCONN; | |
2556 | ||
2557 | /* bomb out completely if the connection bounced. A USB 3.0 | |
2558 | * connection may bounce if multiple warm resets were issued, | |
2559 | * but the device may have successfully re-connected. Ignore it. | |
2560 | */ | |
2561 | if (!hub_is_superspeed(hub->hdev) && | |
2562 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
2563 | return -ENOTCONN; | |
2564 | ||
2565 | if (!(portstatus & USB_PORT_STAT_ENABLE)) | |
2566 | return -EBUSY; | |
2567 | ||
2568 | if (!udev) | |
2569 | return 0; | |
2570 | ||
2571 | if (hub_is_wusb(hub)) | |
2572 | udev->speed = USB_SPEED_WIRELESS; | |
2573 | else if (hub_is_superspeed(hub->hdev)) | |
2574 | udev->speed = USB_SPEED_SUPER; | |
2575 | else if (portstatus & USB_PORT_STAT_HIGH_SPEED) | |
2576 | udev->speed = USB_SPEED_HIGH; | |
2577 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) | |
2578 | udev->speed = USB_SPEED_LOW; | |
2579 | else | |
2580 | udev->speed = USB_SPEED_FULL; | |
2581 | return 0; | |
1da177e4 LT |
2582 | } |
2583 | ||
75d7cf72 | 2584 | static void hub_port_finish_reset(struct usb_hub *hub, int port1, |
a24a6078 | 2585 | struct usb_device *udev, int *status) |
75d7cf72 AX |
2586 | { |
2587 | switch (*status) { | |
2588 | case 0: | |
a24a6078 SS |
2589 | /* TRSTRCY = 10 ms; plus some extra */ |
2590 | msleep(10 + 40); | |
2591 | if (udev) { | |
2592 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
2593 | ||
2594 | update_devnum(udev, 0); | |
2595 | /* The xHC may think the device is already reset, | |
2596 | * so ignore the status. | |
2597 | */ | |
2598 | if (hcd->driver->reset_device) | |
2599 | hcd->driver->reset_device(hcd, udev); | |
75d7cf72 AX |
2600 | } |
2601 | /* FALL THROUGH */ | |
2602 | case -ENOTCONN: | |
2603 | case -ENODEV: | |
ad493e5e | 2604 | usb_clear_port_feature(hub->hdev, |
75d7cf72 | 2605 | port1, USB_PORT_FEAT_C_RESET); |
1c7439c6 | 2606 | if (hub_is_superspeed(hub->hdev)) { |
ad493e5e | 2607 | usb_clear_port_feature(hub->hdev, port1, |
75d7cf72 | 2608 | USB_PORT_FEAT_C_BH_PORT_RESET); |
ad493e5e | 2609 | usb_clear_port_feature(hub->hdev, port1, |
75d7cf72 | 2610 | USB_PORT_FEAT_C_PORT_LINK_STATE); |
ad493e5e | 2611 | usb_clear_port_feature(hub->hdev, port1, |
a24a6078 | 2612 | USB_PORT_FEAT_C_CONNECTION); |
1c7439c6 | 2613 | } |
a24a6078 | 2614 | if (udev) |
75d7cf72 AX |
2615 | usb_set_device_state(udev, *status |
2616 | ? USB_STATE_NOTATTACHED | |
2617 | : USB_STATE_DEFAULT); | |
75d7cf72 AX |
2618 | break; |
2619 | } | |
2620 | } | |
2621 | ||
2622 | /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ | |
1da177e4 | 2623 | static int hub_port_reset(struct usb_hub *hub, int port1, |
75d7cf72 | 2624 | struct usb_device *udev, unsigned int delay, bool warm) |
1da177e4 LT |
2625 | { |
2626 | int i, status; | |
a24a6078 | 2627 | u16 portchange, portstatus; |
1da177e4 | 2628 | |
0fe51aa5 SS |
2629 | if (!hub_is_superspeed(hub->hdev)) { |
2630 | if (warm) { | |
75d7cf72 AX |
2631 | dev_err(hub->intfdev, "only USB3 hub support " |
2632 | "warm reset\n"); | |
2633 | return -EINVAL; | |
2634 | } | |
0fe51aa5 SS |
2635 | /* Block EHCI CF initialization during the port reset. |
2636 | * Some companion controllers don't like it when they mix. | |
2637 | */ | |
2638 | down_read(&ehci_cf_port_reset_rwsem); | |
d3b9d7a9 SS |
2639 | } else if (!warm) { |
2640 | /* | |
2641 | * If the caller hasn't explicitly requested a warm reset, | |
2642 | * double check and see if one is needed. | |
2643 | */ | |
2644 | status = hub_port_status(hub, port1, | |
2645 | &portstatus, &portchange); | |
2646 | if (status < 0) | |
2647 | goto done; | |
2648 | ||
2649 | if (hub_port_warm_reset_required(hub, portstatus)) | |
2650 | warm = true; | |
75d7cf72 | 2651 | } |
32fe0198 | 2652 | |
1da177e4 LT |
2653 | /* Reset the port */ |
2654 | for (i = 0; i < PORT_RESET_TRIES; i++) { | |
75d7cf72 AX |
2655 | status = set_port_feature(hub->hdev, port1, (warm ? |
2656 | USB_PORT_FEAT_BH_PORT_RESET : | |
2657 | USB_PORT_FEAT_RESET)); | |
e9e88fb7 AS |
2658 | if (status == -ENODEV) { |
2659 | ; /* The hub is gone */ | |
2660 | } else if (status) { | |
1da177e4 | 2661 | dev_err(hub->intfdev, |
75d7cf72 AX |
2662 | "cannot %sreset port %d (err = %d)\n", |
2663 | warm ? "warm " : "", port1, status); | |
2664 | } else { | |
2665 | status = hub_port_wait_reset(hub, port1, udev, delay, | |
2666 | warm); | |
e9e88fb7 | 2667 | if (status && status != -ENOTCONN && status != -ENODEV) |
1da177e4 LT |
2668 | dev_dbg(hub->intfdev, |
2669 | "port_wait_reset: err = %d\n", | |
2670 | status); | |
2671 | } | |
2672 | ||
a24a6078 | 2673 | /* Check for disconnect or reset */ |
75d7cf72 | 2674 | if (status == 0 || status == -ENOTCONN || status == -ENODEV) { |
a24a6078 SS |
2675 | hub_port_finish_reset(hub, port1, udev, &status); |
2676 | ||
2677 | if (!hub_is_superspeed(hub->hdev)) | |
2678 | goto done; | |
2679 | ||
2680 | /* | |
2681 | * If a USB 3.0 device migrates from reset to an error | |
2682 | * state, re-issue the warm reset. | |
2683 | */ | |
2684 | if (hub_port_status(hub, port1, | |
2685 | &portstatus, &portchange) < 0) | |
2686 | goto done; | |
2687 | ||
2688 | if (!hub_port_warm_reset_required(hub, portstatus)) | |
2689 | goto done; | |
2690 | ||
2691 | /* | |
2692 | * If the port is in SS.Inactive or Compliance Mode, the | |
2693 | * hot or warm reset failed. Try another warm reset. | |
2694 | */ | |
2695 | if (!warm) { | |
2696 | dev_dbg(hub->intfdev, "hot reset failed, warm reset port %d\n", | |
2697 | port1); | |
2698 | warm = true; | |
2699 | } | |
1da177e4 LT |
2700 | } |
2701 | ||
2702 | dev_dbg (hub->intfdev, | |
75d7cf72 AX |
2703 | "port %d not enabled, trying %sreset again...\n", |
2704 | port1, warm ? "warm " : ""); | |
1da177e4 LT |
2705 | delay = HUB_LONG_RESET_TIME; |
2706 | } | |
2707 | ||
2708 | dev_err (hub->intfdev, | |
2709 | "Cannot enable port %i. Maybe the USB cable is bad?\n", | |
2710 | port1); | |
2711 | ||
75d7cf72 | 2712 | done: |
0fe51aa5 | 2713 | if (!hub_is_superspeed(hub->hdev)) |
75d7cf72 | 2714 | up_read(&ehci_cf_port_reset_rwsem); |
5e467f6e | 2715 | |
75d7cf72 | 2716 | return status; |
5e467f6e AX |
2717 | } |
2718 | ||
0ed9a57e AX |
2719 | /* Check if a port is power on */ |
2720 | static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) | |
2721 | { | |
2722 | int ret = 0; | |
2723 | ||
2724 | if (hub_is_superspeed(hub->hdev)) { | |
2725 | if (portstatus & USB_SS_PORT_STAT_POWER) | |
2726 | ret = 1; | |
2727 | } else { | |
2728 | if (portstatus & USB_PORT_STAT_POWER) | |
2729 | ret = 1; | |
2730 | } | |
2731 | ||
2732 | return ret; | |
2733 | } | |
2734 | ||
d388dab7 | 2735 | #ifdef CONFIG_PM |
1da177e4 | 2736 | |
0ed9a57e AX |
2737 | /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ |
2738 | static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) | |
2739 | { | |
2740 | int ret = 0; | |
2741 | ||
2742 | if (hub_is_superspeed(hub->hdev)) { | |
2743 | if ((portstatus & USB_PORT_STAT_LINK_STATE) | |
2744 | == USB_SS_PORT_LS_U3) | |
2745 | ret = 1; | |
2746 | } else { | |
2747 | if (portstatus & USB_PORT_STAT_SUSPEND) | |
2748 | ret = 1; | |
2749 | } | |
2750 | ||
2751 | return ret; | |
2752 | } | |
b01b03f3 AS |
2753 | |
2754 | /* Determine whether the device on a port is ready for a normal resume, | |
2755 | * is ready for a reset-resume, or should be disconnected. | |
2756 | */ | |
2757 | static int check_port_resume_type(struct usb_device *udev, | |
2758 | struct usb_hub *hub, int port1, | |
2759 | int status, unsigned portchange, unsigned portstatus) | |
2760 | { | |
2761 | /* Is the device still present? */ | |
0ed9a57e AX |
2762 | if (status || port_is_suspended(hub, portstatus) || |
2763 | !port_is_power_on(hub, portstatus) || | |
2764 | !(portstatus & USB_PORT_STAT_CONNECTION)) { | |
b01b03f3 AS |
2765 | if (status >= 0) |
2766 | status = -ENODEV; | |
2767 | } | |
2768 | ||
86c57edf AS |
2769 | /* Can't do a normal resume if the port isn't enabled, |
2770 | * so try a reset-resume instead. | |
2771 | */ | |
2772 | else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { | |
2773 | if (udev->persist_enabled) | |
2774 | udev->reset_resume = 1; | |
2775 | else | |
2776 | status = -ENODEV; | |
2777 | } | |
b01b03f3 AS |
2778 | |
2779 | if (status) { | |
2780 | dev_dbg(hub->intfdev, | |
2781 | "port %d status %04x.%04x after resume, %d\n", | |
2782 | port1, portchange, portstatus, status); | |
2783 | } else if (udev->reset_resume) { | |
2784 | ||
2785 | /* Late port handoff can set status-change bits */ | |
2786 | if (portchange & USB_PORT_STAT_C_CONNECTION) | |
ad493e5e | 2787 | usb_clear_port_feature(hub->hdev, port1, |
b01b03f3 AS |
2788 | USB_PORT_FEAT_C_CONNECTION); |
2789 | if (portchange & USB_PORT_STAT_C_ENABLE) | |
ad493e5e | 2790 | usb_clear_port_feature(hub->hdev, port1, |
b01b03f3 AS |
2791 | USB_PORT_FEAT_C_ENABLE); |
2792 | } | |
2793 | ||
2794 | return status; | |
2795 | } | |
2796 | ||
f74631e3 SS |
2797 | int usb_disable_ltm(struct usb_device *udev) |
2798 | { | |
2799 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
2800 | ||
2801 | /* Check if the roothub and device supports LTM. */ | |
2802 | if (!usb_device_supports_ltm(hcd->self.root_hub) || | |
2803 | !usb_device_supports_ltm(udev)) | |
2804 | return 0; | |
2805 | ||
2806 | /* Clear Feature LTM Enable can only be sent if the device is | |
2807 | * configured. | |
2808 | */ | |
2809 | if (!udev->actconfig) | |
2810 | return 0; | |
2811 | ||
2812 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
2813 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, | |
2814 | USB_DEVICE_LTM_ENABLE, 0, NULL, 0, | |
2815 | USB_CTRL_SET_TIMEOUT); | |
2816 | } | |
2817 | EXPORT_SYMBOL_GPL(usb_disable_ltm); | |
2818 | ||
2819 | void usb_enable_ltm(struct usb_device *udev) | |
2820 | { | |
2821 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
2822 | ||
2823 | /* Check if the roothub and device supports LTM. */ | |
2824 | if (!usb_device_supports_ltm(hcd->self.root_hub) || | |
2825 | !usb_device_supports_ltm(udev)) | |
2826 | return; | |
2827 | ||
2828 | /* Set Feature LTM Enable can only be sent if the device is | |
2829 | * configured. | |
2830 | */ | |
2831 | if (!udev->actconfig) | |
2832 | return; | |
2833 | ||
2834 | usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
2835 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
2836 | USB_DEVICE_LTM_ENABLE, 0, NULL, 0, | |
2837 | USB_CTRL_SET_TIMEOUT); | |
2838 | } | |
2839 | EXPORT_SYMBOL_GPL(usb_enable_ltm); | |
2840 | ||
84ebc102 | 2841 | #ifdef CONFIG_PM |
54a3ac0c LT |
2842 | /* |
2843 | * usb_disable_function_remotewakeup - disable usb3.0 | |
2844 | * device's function remote wakeup | |
2845 | * @udev: target device | |
2846 | * | |
2847 | * Assume there's only one function on the USB 3.0 | |
2848 | * device and disable remote wake for the first | |
2849 | * interface. FIXME if the interface association | |
2850 | * descriptor shows there's more than one function. | |
2851 | */ | |
2852 | static int usb_disable_function_remotewakeup(struct usb_device *udev) | |
2853 | { | |
2854 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
2855 | USB_REQ_CLEAR_FEATURE, USB_RECIP_INTERFACE, | |
2856 | USB_INTRF_FUNC_SUSPEND, 0, NULL, 0, | |
2857 | USB_CTRL_SET_TIMEOUT); | |
2858 | } | |
1da177e4 | 2859 | |
e583d9db AS |
2860 | /* Count of wakeup-enabled devices at or below udev */ |
2861 | static unsigned wakeup_enabled_descendants(struct usb_device *udev) | |
2862 | { | |
2863 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); | |
2864 | ||
2865 | return udev->do_remote_wakeup + | |
2866 | (hub ? hub->wakeup_enabled_descendants : 0); | |
2867 | } | |
2868 | ||
1da177e4 | 2869 | /* |
624d6c07 AS |
2870 | * usb_port_suspend - suspend a usb device's upstream port |
2871 | * @udev: device that's no longer in active use, not a root hub | |
2872 | * Context: must be able to sleep; device not locked; pm locks held | |
2873 | * | |
2874 | * Suspends a USB device that isn't in active use, conserving power. | |
2875 | * Devices may wake out of a suspend, if anything important happens, | |
2876 | * using the remote wakeup mechanism. They may also be taken out of | |
2877 | * suspend by the host, using usb_port_resume(). It's also routine | |
2878 | * to disconnect devices while they are suspended. | |
2879 | * | |
2880 | * This only affects the USB hardware for a device; its interfaces | |
2881 | * (and, for hubs, child devices) must already have been suspended. | |
2882 | * | |
1da177e4 LT |
2883 | * Selective port suspend reduces power; most suspended devices draw |
2884 | * less than 500 uA. It's also used in OTG, along with remote wakeup. | |
2885 | * All devices below the suspended port are also suspended. | |
2886 | * | |
2887 | * Devices leave suspend state when the host wakes them up. Some devices | |
2888 | * also support "remote wakeup", where the device can activate the USB | |
2889 | * tree above them to deliver data, such as a keypress or packet. In | |
2890 | * some cases, this wakes the USB host. | |
624d6c07 AS |
2891 | * |
2892 | * Suspending OTG devices may trigger HNP, if that's been enabled | |
2893 | * between a pair of dual-role devices. That will change roles, such | |
2894 | * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. | |
2895 | * | |
2896 | * Devices on USB hub ports have only one "suspend" state, corresponding | |
2897 | * to ACPI D2, "may cause the device to lose some context". | |
2898 | * State transitions include: | |
2899 | * | |
2900 | * - suspend, resume ... when the VBUS power link stays live | |
2901 | * - suspend, disconnect ... VBUS lost | |
2902 | * | |
2903 | * Once VBUS drop breaks the circuit, the port it's using has to go through | |
2904 | * normal re-enumeration procedures, starting with enabling VBUS power. | |
2905 | * Other than re-initializing the hub (plug/unplug, except for root hubs), | |
2906 | * Linux (2.6) currently has NO mechanisms to initiate that: no khubd | |
2907 | * timer, no SRP, no requests through sysfs. | |
2908 | * | |
e583d9db AS |
2909 | * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get |
2910 | * suspended until their bus goes into global suspend (i.e., the root | |
0aa2832d AS |
2911 | * hub is suspended). Nevertheless, we change @udev->state to |
2912 | * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual | |
2913 | * upstream port setting is stored in @udev->port_is_suspended. | |
624d6c07 AS |
2914 | * |
2915 | * Returns 0 on success, else negative errno. | |
1da177e4 | 2916 | */ |
65bfd296 | 2917 | int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 2918 | { |
ad493e5e LT |
2919 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
2920 | struct usb_port *port_dev = hub->ports[udev->portnum - 1]; | |
624d6c07 AS |
2921 | int port1 = udev->portnum; |
2922 | int status; | |
0aa2832d | 2923 | bool really_suspend = true; |
1da177e4 | 2924 | |
1da177e4 LT |
2925 | /* enable remote wakeup when appropriate; this lets the device |
2926 | * wake up the upstream hub (including maybe the root hub). | |
2927 | * | |
2928 | * NOTE: OTG devices may issue remote wakeup (or SRP) even when | |
2929 | * we don't explicitly enable it here. | |
2930 | */ | |
645daaab | 2931 | if (udev->do_remote_wakeup) { |
623bef9e SS |
2932 | if (!hub_is_superspeed(hub->hdev)) { |
2933 | status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
2934 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
2935 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
2936 | NULL, 0, | |
2937 | USB_CTRL_SET_TIMEOUT); | |
2938 | } else { | |
2939 | /* Assume there's only one function on the USB 3.0 | |
2940 | * device and enable remote wake for the first | |
2941 | * interface. FIXME if the interface association | |
2942 | * descriptor shows there's more than one function. | |
2943 | */ | |
2944 | status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
2945 | USB_REQ_SET_FEATURE, | |
2946 | USB_RECIP_INTERFACE, | |
2947 | USB_INTRF_FUNC_SUSPEND, | |
3b9b6acd SS |
2948 | USB_INTRF_FUNC_SUSPEND_RW | |
2949 | USB_INTRF_FUNC_SUSPEND_LP, | |
623bef9e SS |
2950 | NULL, 0, |
2951 | USB_CTRL_SET_TIMEOUT); | |
2952 | } | |
0c487206 | 2953 | if (status) { |
624d6c07 AS |
2954 | dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", |
2955 | status); | |
0c487206 | 2956 | /* bail if autosuspend is requested */ |
5b1b0b81 | 2957 | if (PMSG_IS_AUTO(msg)) |
aa5ceae2 | 2958 | goto err_wakeup; |
0c487206 | 2959 | } |
1da177e4 LT |
2960 | } |
2961 | ||
65580b43 AX |
2962 | /* disable USB2 hardware LPM */ |
2963 | if (udev->usb2_hw_lpm_enabled == 1) | |
2964 | usb_set_usb2_hardware_lpm(udev, 0); | |
2965 | ||
f74631e3 | 2966 | if (usb_disable_ltm(udev)) { |
aa5ceae2 AS |
2967 | dev_err(&udev->dev, "Failed to disable LTM before suspend\n."); |
2968 | status = -ENOMEM; | |
2969 | if (PMSG_IS_AUTO(msg)) | |
2970 | goto err_ltm; | |
f74631e3 | 2971 | } |
8306095f | 2972 | if (usb_unlocked_disable_lpm(udev)) { |
aa5ceae2 AS |
2973 | dev_err(&udev->dev, "Failed to disable LPM before suspend\n."); |
2974 | status = -ENOMEM; | |
2975 | if (PMSG_IS_AUTO(msg)) | |
2976 | goto err_lpm3; | |
8306095f SS |
2977 | } |
2978 | ||
1da177e4 | 2979 | /* see 7.1.7.6 */ |
a7114230 | 2980 | if (hub_is_superspeed(hub->hdev)) |
c2f60db7 | 2981 | status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3); |
e583d9db | 2982 | |
0aa2832d AS |
2983 | /* |
2984 | * For system suspend, we do not need to enable the suspend feature | |
2985 | * on individual USB-2 ports. The devices will automatically go | |
2986 | * into suspend a few ms after the root hub stops sending packets. | |
2987 | * The USB 2.0 spec calls this "global suspend". | |
e583d9db AS |
2988 | * |
2989 | * However, many USB hubs have a bug: They don't relay wakeup requests | |
2990 | * from a downstream port if the port's suspend feature isn't on. | |
2991 | * Therefore we will turn on the suspend feature if udev or any of its | |
2992 | * descendants is enabled for remote wakeup. | |
0aa2832d | 2993 | */ |
e583d9db AS |
2994 | else if (PMSG_IS_AUTO(msg) || wakeup_enabled_descendants(udev) > 0) |
2995 | status = set_port_feature(hub->hdev, port1, | |
2996 | USB_PORT_FEAT_SUSPEND); | |
0aa2832d AS |
2997 | else { |
2998 | really_suspend = false; | |
2999 | status = 0; | |
3000 | } | |
1da177e4 | 3001 | if (status) { |
624d6c07 AS |
3002 | dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", |
3003 | port1, status); | |
cbb33004 | 3004 | |
aa5ceae2 AS |
3005 | /* Try to enable USB3 LPM and LTM again */ |
3006 | usb_unlocked_enable_lpm(udev); | |
3007 | err_lpm3: | |
3008 | usb_enable_ltm(udev); | |
3009 | err_ltm: | |
c3e751e4 AX |
3010 | /* Try to enable USB2 hardware LPM again */ |
3011 | if (udev->usb2_hw_lpm_capable == 1) | |
3012 | usb_set_usb2_hardware_lpm(udev, 1); | |
3013 | ||
aa5ceae2 AS |
3014 | if (udev->do_remote_wakeup) { |
3015 | if (udev->speed < USB_SPEED_SUPER) | |
3016 | usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3017 | USB_REQ_CLEAR_FEATURE, | |
3018 | USB_RECIP_DEVICE, | |
3019 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
3020 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
3021 | else | |
3022 | usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3023 | USB_REQ_CLEAR_FEATURE, | |
3024 | USB_RECIP_INTERFACE, | |
3025 | USB_INTRF_FUNC_SUSPEND, 0, | |
3026 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
3027 | } | |
3028 | err_wakeup: | |
8306095f | 3029 | |
cbb33004 | 3030 | /* System sleep transitions should never fail */ |
5b1b0b81 | 3031 | if (!PMSG_IS_AUTO(msg)) |
cbb33004 | 3032 | status = 0; |
1da177e4 | 3033 | } else { |
30b1a7a3 AS |
3034 | dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n", |
3035 | (PMSG_IS_AUTO(msg) ? "auto-" : ""), | |
3036 | udev->do_remote_wakeup); | |
0aa2832d AS |
3037 | if (really_suspend) { |
3038 | udev->port_is_suspended = 1; | |
e583d9db AS |
3039 | |
3040 | /* device has up to 10 msec to fully suspend */ | |
0aa2832d AS |
3041 | msleep(10); |
3042 | } | |
e583d9db | 3043 | usb_set_device_state(udev, USB_STATE_SUSPENDED); |
1da177e4 | 3044 | } |
ad493e5e LT |
3045 | |
3046 | /* | |
3047 | * Check whether current status meets the requirement of | |
3048 | * usb port power off mechanism | |
3049 | */ | |
aa5ceae2 AS |
3050 | if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled) { |
3051 | enum pm_qos_flags_status pm_qos_stat; | |
3052 | ||
3053 | pm_qos_stat = dev_pm_qos_flags(&port_dev->dev, | |
3054 | PM_QOS_FLAG_NO_POWER_OFF); | |
3055 | if (pm_qos_stat != PM_QOS_FLAGS_ALL) { | |
3056 | pm_runtime_put_sync(&port_dev->dev); | |
3057 | port_dev->did_runtime_put = true; | |
3058 | } | |
ad493e5e LT |
3059 | } |
3060 | ||
c08512c7 | 3061 | usb_mark_last_busy(hub->hdev); |
1da177e4 LT |
3062 | return status; |
3063 | } | |
3064 | ||
1da177e4 | 3065 | /* |
390a8c34 DB |
3066 | * If the USB "suspend" state is in use (rather than "global suspend"), |
3067 | * many devices will be individually taken out of suspend state using | |
54515fe5 | 3068 | * special "resume" signaling. This routine kicks in shortly after |
1da177e4 LT |
3069 | * hardware resume signaling is finished, either because of selective |
3070 | * resume (by host) or remote wakeup (by device) ... now see what changed | |
3071 | * in the tree that's rooted at this device. | |
54515fe5 AS |
3072 | * |
3073 | * If @udev->reset_resume is set then the device is reset before the | |
3074 | * status check is done. | |
1da177e4 | 3075 | */ |
140d8f68 | 3076 | static int finish_port_resume(struct usb_device *udev) |
1da177e4 | 3077 | { |
54515fe5 | 3078 | int status = 0; |
07e72b95 | 3079 | u16 devstatus = 0; |
1da177e4 LT |
3080 | |
3081 | /* caller owns the udev device lock */ | |
b9cef6c3 WF |
3082 | dev_dbg(&udev->dev, "%s\n", |
3083 | udev->reset_resume ? "finish reset-resume" : "finish resume"); | |
1da177e4 LT |
3084 | |
3085 | /* usb ch9 identifies four variants of SUSPENDED, based on what | |
3086 | * state the device resumes to. Linux currently won't see the | |
3087 | * first two on the host side; they'd be inside hub_port_init() | |
3088 | * during many timeouts, but khubd can't suspend until later. | |
3089 | */ | |
3090 | usb_set_device_state(udev, udev->actconfig | |
3091 | ? USB_STATE_CONFIGURED | |
3092 | : USB_STATE_ADDRESS); | |
1da177e4 | 3093 | |
54515fe5 AS |
3094 | /* 10.5.4.5 says not to reset a suspended port if the attached |
3095 | * device is enabled for remote wakeup. Hence the reset | |
3096 | * operation is carried out here, after the port has been | |
3097 | * resumed. | |
3098 | */ | |
3099 | if (udev->reset_resume) | |
86c57edf | 3100 | retry_reset_resume: |
742120c6 | 3101 | status = usb_reset_and_verify_device(udev); |
54515fe5 | 3102 | |
1da177e4 LT |
3103 | /* 10.5.4.5 says be sure devices in the tree are still there. |
3104 | * For now let's assume the device didn't go crazy on resume, | |
3105 | * and device drivers will know about any resume quirks. | |
3106 | */ | |
54515fe5 | 3107 | if (status == 0) { |
46dede46 | 3108 | devstatus = 0; |
54515fe5 AS |
3109 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); |
3110 | if (status >= 0) | |
46dede46 | 3111 | status = (status > 0 ? 0 : -ENODEV); |
86c57edf AS |
3112 | |
3113 | /* If a normal resume failed, try doing a reset-resume */ | |
3114 | if (status && !udev->reset_resume && udev->persist_enabled) { | |
3115 | dev_dbg(&udev->dev, "retry with reset-resume\n"); | |
3116 | udev->reset_resume = 1; | |
3117 | goto retry_reset_resume; | |
3118 | } | |
54515fe5 | 3119 | } |
b40b7a90 | 3120 | |
624d6c07 AS |
3121 | if (status) { |
3122 | dev_dbg(&udev->dev, "gone after usb resume? status %d\n", | |
3123 | status); | |
07e72b95 ON |
3124 | /* |
3125 | * There are a few quirky devices which violate the standard | |
3126 | * by claiming to have remote wakeup enabled after a reset, | |
3127 | * which crash if the feature is cleared, hence check for | |
3128 | * udev->reset_resume | |
3129 | */ | |
3130 | } else if (udev->actconfig && !udev->reset_resume) { | |
54a3ac0c LT |
3131 | if (!hub_is_superspeed(udev->parent)) { |
3132 | le16_to_cpus(&devstatus); | |
3133 | if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) | |
3134 | status = usb_control_msg(udev, | |
3135 | usb_sndctrlpipe(udev, 0), | |
3136 | USB_REQ_CLEAR_FEATURE, | |
1da177e4 | 3137 | USB_RECIP_DEVICE, |
54a3ac0c LT |
3138 | USB_DEVICE_REMOTE_WAKEUP, 0, |
3139 | NULL, 0, | |
3140 | USB_CTRL_SET_TIMEOUT); | |
3141 | } else { | |
3142 | status = usb_get_status(udev, USB_RECIP_INTERFACE, 0, | |
3143 | &devstatus); | |
3144 | le16_to_cpus(&devstatus); | |
3145 | if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP | |
3146 | | USB_INTRF_STAT_FUNC_RW)) | |
3147 | status = | |
3148 | usb_disable_function_remotewakeup(udev); | |
4bf0ba86 | 3149 | } |
54a3ac0c LT |
3150 | |
3151 | if (status) | |
3152 | dev_dbg(&udev->dev, | |
3153 | "disable remote wakeup, status %d\n", | |
3154 | status); | |
1da177e4 | 3155 | status = 0; |
1da177e4 LT |
3156 | } |
3157 | return status; | |
3158 | } | |
3159 | ||
624d6c07 AS |
3160 | /* |
3161 | * usb_port_resume - re-activate a suspended usb device's upstream port | |
3162 | * @udev: device to re-activate, not a root hub | |
3163 | * Context: must be able to sleep; device not locked; pm locks held | |
3164 | * | |
3165 | * This will re-activate the suspended device, increasing power usage | |
3166 | * while letting drivers communicate again with its endpoints. | |
3167 | * USB resume explicitly guarantees that the power session between | |
3168 | * the host and the device is the same as it was when the device | |
3169 | * suspended. | |
3170 | * | |
feccc30d AS |
3171 | * If @udev->reset_resume is set then this routine won't check that the |
3172 | * port is still enabled. Furthermore, finish_port_resume() above will | |
54515fe5 AS |
3173 | * reset @udev. The end result is that a broken power session can be |
3174 | * recovered and @udev will appear to persist across a loss of VBUS power. | |
3175 | * | |
3176 | * For example, if a host controller doesn't maintain VBUS suspend current | |
3177 | * during a system sleep or is reset when the system wakes up, all the USB | |
3178 | * power sessions below it will be broken. This is especially troublesome | |
3179 | * for mass-storage devices containing mounted filesystems, since the | |
3180 | * device will appear to have disconnected and all the memory mappings | |
3181 | * to it will be lost. Using the USB_PERSIST facility, the device can be | |
3182 | * made to appear as if it had not disconnected. | |
3183 | * | |
742120c6 | 3184 | * This facility can be dangerous. Although usb_reset_and_verify_device() makes |
feccc30d | 3185 | * every effort to insure that the same device is present after the |
54515fe5 AS |
3186 | * reset as before, it cannot provide a 100% guarantee. Furthermore it's |
3187 | * quite possible for a device to remain unaltered but its media to be | |
3188 | * changed. If the user replaces a flash memory card while the system is | |
3189 | * asleep, he will have only himself to blame when the filesystem on the | |
3190 | * new card is corrupted and the system crashes. | |
3191 | * | |
624d6c07 AS |
3192 | * Returns 0 on success, else negative errno. |
3193 | */ | |
65bfd296 | 3194 | int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 3195 | { |
ad493e5e LT |
3196 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
3197 | struct usb_port *port_dev = hub->ports[udev->portnum - 1]; | |
624d6c07 AS |
3198 | int port1 = udev->portnum; |
3199 | int status; | |
3200 | u16 portchange, portstatus; | |
d25450c6 | 3201 | |
ad493e5e LT |
3202 | if (port_dev->did_runtime_put) { |
3203 | status = pm_runtime_get_sync(&port_dev->dev); | |
3204 | port_dev->did_runtime_put = false; | |
3205 | if (status < 0) { | |
3206 | dev_dbg(&udev->dev, "can't resume usb port, status %d\n", | |
3207 | status); | |
3208 | return status; | |
3209 | } | |
3210 | } | |
3211 | ||
d25450c6 AS |
3212 | /* Skip the initial Clear-Suspend step for a remote wakeup */ |
3213 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
0ed9a57e | 3214 | if (status == 0 && !port_is_suspended(hub, portstatus)) |
d25450c6 | 3215 | goto SuspendCleared; |
1da177e4 LT |
3216 | |
3217 | // dev_dbg(hub->intfdev, "resume port %d\n", port1); | |
3218 | ||
d5cbad4b AS |
3219 | set_bit(port1, hub->busy_bits); |
3220 | ||
1da177e4 | 3221 | /* see 7.1.7.7; affects power usage, but not budgeting */ |
a7114230 | 3222 | if (hub_is_superspeed(hub->hdev)) |
c2f60db7 | 3223 | status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0); |
a7114230 | 3224 | else |
ad493e5e | 3225 | status = usb_clear_port_feature(hub->hdev, |
a7114230 | 3226 | port1, USB_PORT_FEAT_SUSPEND); |
1da177e4 | 3227 | if (status) { |
624d6c07 AS |
3228 | dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", |
3229 | port1, status); | |
1da177e4 | 3230 | } else { |
1da177e4 | 3231 | /* drive resume for at least 20 msec */ |
686314cf | 3232 | dev_dbg(&udev->dev, "usb %sresume\n", |
5b1b0b81 | 3233 | (PMSG_IS_AUTO(msg) ? "auto-" : "")); |
1da177e4 LT |
3234 | msleep(25); |
3235 | ||
1da177e4 LT |
3236 | /* Virtual root hubs can trigger on GET_PORT_STATUS to |
3237 | * stop resume signaling. Then finish the resume | |
3238 | * sequence. | |
3239 | */ | |
d25450c6 | 3240 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
54515fe5 | 3241 | |
b01b03f3 AS |
3242 | /* TRSMRCY = 10 msec */ |
3243 | msleep(10); | |
3244 | } | |
3245 | ||
54515fe5 | 3246 | SuspendCleared: |
b01b03f3 | 3247 | if (status == 0) { |
bfd1e910 | 3248 | udev->port_is_suspended = 0; |
a7114230 AX |
3249 | if (hub_is_superspeed(hub->hdev)) { |
3250 | if (portchange & USB_PORT_STAT_C_LINK_STATE) | |
ad493e5e | 3251 | usb_clear_port_feature(hub->hdev, port1, |
a7114230 AX |
3252 | USB_PORT_FEAT_C_PORT_LINK_STATE); |
3253 | } else { | |
3254 | if (portchange & USB_PORT_STAT_C_SUSPEND) | |
ad493e5e | 3255 | usb_clear_port_feature(hub->hdev, port1, |
a7114230 AX |
3256 | USB_PORT_FEAT_C_SUSPEND); |
3257 | } | |
1da177e4 | 3258 | } |
1da177e4 | 3259 | |
d5cbad4b | 3260 | clear_bit(port1, hub->busy_bits); |
d5cbad4b | 3261 | |
b01b03f3 AS |
3262 | status = check_port_resume_type(udev, |
3263 | hub, port1, status, portchange, portstatus); | |
54515fe5 AS |
3264 | if (status == 0) |
3265 | status = finish_port_resume(udev); | |
3266 | if (status < 0) { | |
3267 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); | |
3268 | hub_port_logical_disconnect(hub, port1); | |
65580b43 AX |
3269 | } else { |
3270 | /* Try to enable USB2 hardware LPM */ | |
3271 | if (udev->usb2_hw_lpm_capable == 1) | |
3272 | usb_set_usb2_hardware_lpm(udev, 1); | |
8306095f | 3273 | |
f74631e3 SS |
3274 | /* Try to enable USB3 LTM and LPM */ |
3275 | usb_enable_ltm(udev); | |
8306095f | 3276 | usb_unlocked_enable_lpm(udev); |
54515fe5 | 3277 | } |
65580b43 | 3278 | |
1da177e4 LT |
3279 | return status; |
3280 | } | |
3281 | ||
84ebc102 AS |
3282 | #endif /* CONFIG_PM */ |
3283 | ||
3284 | #ifdef CONFIG_PM_RUNTIME | |
3285 | ||
8808f00c | 3286 | /* caller has locked udev */ |
0534d468 | 3287 | int usb_remote_wakeup(struct usb_device *udev) |
1da177e4 LT |
3288 | { |
3289 | int status = 0; | |
3290 | ||
1da177e4 | 3291 | if (udev->state == USB_STATE_SUSPENDED) { |
645daaab | 3292 | dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); |
9bbdf1e0 AS |
3293 | status = usb_autoresume_device(udev); |
3294 | if (status == 0) { | |
3295 | /* Let the drivers do their thing, then... */ | |
3296 | usb_autosuspend_device(udev); | |
3297 | } | |
1da177e4 | 3298 | } |
1da177e4 LT |
3299 | return status; |
3300 | } | |
3301 | ||
d388dab7 AS |
3302 | #endif |
3303 | ||
e6f30dea ML |
3304 | static int check_ports_changed(struct usb_hub *hub) |
3305 | { | |
3306 | int port1; | |
3307 | ||
3308 | for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) { | |
3309 | u16 portstatus, portchange; | |
3310 | int status; | |
3311 | ||
3312 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
3313 | if (!status && portchange) | |
3314 | return 1; | |
3315 | } | |
3316 | return 0; | |
3317 | } | |
3318 | ||
db690874 | 3319 | static int hub_suspend(struct usb_interface *intf, pm_message_t msg) |
1da177e4 LT |
3320 | { |
3321 | struct usb_hub *hub = usb_get_intfdata (intf); | |
3322 | struct usb_device *hdev = hub->hdev; | |
3323 | unsigned port1; | |
4296c70a | 3324 | int status; |
1da177e4 | 3325 | |
e583d9db AS |
3326 | /* |
3327 | * Warn if children aren't already suspended. | |
3328 | * Also, add up the number of wakeup-enabled descendants. | |
3329 | */ | |
3330 | hub->wakeup_enabled_descendants = 0; | |
1da177e4 LT |
3331 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
3332 | struct usb_device *udev; | |
3333 | ||
ff823c79 | 3334 | udev = hub->ports[port1 - 1]->child; |
6840d255 | 3335 | if (udev && udev->can_submit) { |
cbb33004 | 3336 | dev_warn(&intf->dev, "port %d nyet suspended\n", port1); |
5b1b0b81 | 3337 | if (PMSG_IS_AUTO(msg)) |
cbb33004 | 3338 | return -EBUSY; |
c9f89fa4 | 3339 | } |
e583d9db AS |
3340 | if (udev) |
3341 | hub->wakeup_enabled_descendants += | |
3342 | wakeup_enabled_descendants(udev); | |
1da177e4 | 3343 | } |
e6f30dea ML |
3344 | |
3345 | if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) { | |
3346 | /* check if there are changes pending on hub ports */ | |
3347 | if (check_ports_changed(hub)) { | |
3348 | if (PMSG_IS_AUTO(msg)) | |
3349 | return -EBUSY; | |
3350 | pm_wakeup_event(&hdev->dev, 2000); | |
3351 | } | |
3352 | } | |
3353 | ||
4296c70a SS |
3354 | if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) { |
3355 | /* Enable hub to send remote wakeup for all ports. */ | |
3356 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { | |
3357 | status = set_port_feature(hdev, | |
3358 | port1 | | |
3359 | USB_PORT_FEAT_REMOTE_WAKE_CONNECT | | |
3360 | USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT | | |
3361 | USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT, | |
3362 | USB_PORT_FEAT_REMOTE_WAKE_MASK); | |
3363 | } | |
3364 | } | |
1da177e4 | 3365 | |
441b62c1 | 3366 | dev_dbg(&intf->dev, "%s\n", __func__); |
40f122f3 | 3367 | |
12f1ff83 | 3368 | /* stop khubd and related activity */ |
4330354f | 3369 | hub_quiesce(hub, HUB_SUSPEND); |
b6f6436d | 3370 | return 0; |
1da177e4 LT |
3371 | } |
3372 | ||
3373 | static int hub_resume(struct usb_interface *intf) | |
3374 | { | |
5e6effae | 3375 | struct usb_hub *hub = usb_get_intfdata(intf); |
40f122f3 | 3376 | |
5e6effae | 3377 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 3378 | hub_activate(hub, HUB_RESUME); |
1da177e4 LT |
3379 | return 0; |
3380 | } | |
3381 | ||
b41a60ec | 3382 | static int hub_reset_resume(struct usb_interface *intf) |
f07600cf | 3383 | { |
b41a60ec | 3384 | struct usb_hub *hub = usb_get_intfdata(intf); |
f07600cf | 3385 | |
5e6effae | 3386 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 3387 | hub_activate(hub, HUB_RESET_RESUME); |
f07600cf AS |
3388 | return 0; |
3389 | } | |
3390 | ||
54515fe5 AS |
3391 | /** |
3392 | * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power | |
3393 | * @rhdev: struct usb_device for the root hub | |
3394 | * | |
3395 | * The USB host controller driver calls this function when its root hub | |
3396 | * is resumed and Vbus power has been interrupted or the controller | |
feccc30d AS |
3397 | * has been reset. The routine marks @rhdev as having lost power. |
3398 | * When the hub driver is resumed it will take notice and carry out | |
3399 | * power-session recovery for all the "USB-PERSIST"-enabled child devices; | |
3400 | * the others will be disconnected. | |
54515fe5 AS |
3401 | */ |
3402 | void usb_root_hub_lost_power(struct usb_device *rhdev) | |
3403 | { | |
3404 | dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); | |
3405 | rhdev->reset_resume = 1; | |
3406 | } | |
3407 | EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); | |
3408 | ||
1ea7e0e8 SS |
3409 | static const char * const usb3_lpm_names[] = { |
3410 | "U0", | |
3411 | "U1", | |
3412 | "U2", | |
3413 | "U3", | |
3414 | }; | |
3415 | ||
3416 | /* | |
3417 | * Send a Set SEL control transfer to the device, prior to enabling | |
3418 | * device-initiated U1 or U2. This lets the device know the exit latencies from | |
3419 | * the time the device initiates a U1 or U2 exit, to the time it will receive a | |
3420 | * packet from the host. | |
3421 | * | |
3422 | * This function will fail if the SEL or PEL values for udev are greater than | |
3423 | * the maximum allowed values for the link state to be enabled. | |
3424 | */ | |
3425 | static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) | |
3426 | { | |
3427 | struct usb_set_sel_req *sel_values; | |
3428 | unsigned long long u1_sel; | |
3429 | unsigned long long u1_pel; | |
3430 | unsigned long long u2_sel; | |
3431 | unsigned long long u2_pel; | |
3432 | int ret; | |
3433 | ||
3434 | /* Convert SEL and PEL stored in ns to us */ | |
3435 | u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); | |
3436 | u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); | |
3437 | u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000); | |
3438 | u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000); | |
3439 | ||
3440 | /* | |
3441 | * Make sure that the calculated SEL and PEL values for the link | |
3442 | * state we're enabling aren't bigger than the max SEL/PEL | |
3443 | * value that will fit in the SET SEL control transfer. | |
3444 | * Otherwise the device would get an incorrect idea of the exit | |
3445 | * latency for the link state, and could start a device-initiated | |
3446 | * U1/U2 when the exit latencies are too high. | |
3447 | */ | |
3448 | if ((state == USB3_LPM_U1 && | |
3449 | (u1_sel > USB3_LPM_MAX_U1_SEL_PEL || | |
3450 | u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) || | |
3451 | (state == USB3_LPM_U2 && | |
3452 | (u2_sel > USB3_LPM_MAX_U2_SEL_PEL || | |
3453 | u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) { | |
1510a1a2 | 3454 | dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n", |
1ea7e0e8 SS |
3455 | usb3_lpm_names[state], u1_sel, u1_pel); |
3456 | return -EINVAL; | |
3457 | } | |
3458 | ||
3459 | /* | |
3460 | * If we're enabling device-initiated LPM for one link state, | |
3461 | * but the other link state has a too high SEL or PEL value, | |
3462 | * just set those values to the max in the Set SEL request. | |
3463 | */ | |
3464 | if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL) | |
3465 | u1_sel = USB3_LPM_MAX_U1_SEL_PEL; | |
3466 | ||
3467 | if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL) | |
3468 | u1_pel = USB3_LPM_MAX_U1_SEL_PEL; | |
3469 | ||
3470 | if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL) | |
3471 | u2_sel = USB3_LPM_MAX_U2_SEL_PEL; | |
3472 | ||
3473 | if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL) | |
3474 | u2_pel = USB3_LPM_MAX_U2_SEL_PEL; | |
3475 | ||
3476 | /* | |
3477 | * usb_enable_lpm() can be called as part of a failed device reset, | |
3478 | * which may be initiated by an error path of a mass storage driver. | |
3479 | * Therefore, use GFP_NOIO. | |
3480 | */ | |
3481 | sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO); | |
3482 | if (!sel_values) | |
3483 | return -ENOMEM; | |
3484 | ||
3485 | sel_values->u1_sel = u1_sel; | |
3486 | sel_values->u1_pel = u1_pel; | |
3487 | sel_values->u2_sel = cpu_to_le16(u2_sel); | |
3488 | sel_values->u2_pel = cpu_to_le16(u2_pel); | |
3489 | ||
3490 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3491 | USB_REQ_SET_SEL, | |
3492 | USB_RECIP_DEVICE, | |
3493 | 0, 0, | |
3494 | sel_values, sizeof *(sel_values), | |
3495 | USB_CTRL_SET_TIMEOUT); | |
3496 | kfree(sel_values); | |
3497 | return ret; | |
3498 | } | |
3499 | ||
3500 | /* | |
3501 | * Enable or disable device-initiated U1 or U2 transitions. | |
3502 | */ | |
3503 | static int usb_set_device_initiated_lpm(struct usb_device *udev, | |
3504 | enum usb3_link_state state, bool enable) | |
3505 | { | |
3506 | int ret; | |
3507 | int feature; | |
3508 | ||
3509 | switch (state) { | |
3510 | case USB3_LPM_U1: | |
3511 | feature = USB_DEVICE_U1_ENABLE; | |
3512 | break; | |
3513 | case USB3_LPM_U2: | |
3514 | feature = USB_DEVICE_U2_ENABLE; | |
3515 | break; | |
3516 | default: | |
3517 | dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n", | |
3518 | __func__, enable ? "enable" : "disable"); | |
3519 | return -EINVAL; | |
3520 | } | |
3521 | ||
3522 | if (udev->state != USB_STATE_CONFIGURED) { | |
3523 | dev_dbg(&udev->dev, "%s: Can't %s %s state " | |
3524 | "for unconfigured device.\n", | |
3525 | __func__, enable ? "enable" : "disable", | |
3526 | usb3_lpm_names[state]); | |
3527 | return 0; | |
3528 | } | |
3529 | ||
3530 | if (enable) { | |
1ea7e0e8 SS |
3531 | /* |
3532 | * Now send the control transfer to enable device-initiated LPM | |
3533 | * for either U1 or U2. | |
3534 | */ | |
3535 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3536 | USB_REQ_SET_FEATURE, | |
3537 | USB_RECIP_DEVICE, | |
3538 | feature, | |
3539 | 0, NULL, 0, | |
3540 | USB_CTRL_SET_TIMEOUT); | |
3541 | } else { | |
3542 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3543 | USB_REQ_CLEAR_FEATURE, | |
3544 | USB_RECIP_DEVICE, | |
3545 | feature, | |
3546 | 0, NULL, 0, | |
3547 | USB_CTRL_SET_TIMEOUT); | |
3548 | } | |
3549 | if (ret < 0) { | |
3550 | dev_warn(&udev->dev, "%s of device-initiated %s failed.\n", | |
3551 | enable ? "Enable" : "Disable", | |
3552 | usb3_lpm_names[state]); | |
3553 | return -EBUSY; | |
3554 | } | |
3555 | return 0; | |
3556 | } | |
3557 | ||
3558 | static int usb_set_lpm_timeout(struct usb_device *udev, | |
3559 | enum usb3_link_state state, int timeout) | |
3560 | { | |
3561 | int ret; | |
3562 | int feature; | |
3563 | ||
3564 | switch (state) { | |
3565 | case USB3_LPM_U1: | |
3566 | feature = USB_PORT_FEAT_U1_TIMEOUT; | |
3567 | break; | |
3568 | case USB3_LPM_U2: | |
3569 | feature = USB_PORT_FEAT_U2_TIMEOUT; | |
3570 | break; | |
3571 | default: | |
3572 | dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n", | |
3573 | __func__); | |
3574 | return -EINVAL; | |
3575 | } | |
3576 | ||
3577 | if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT && | |
3578 | timeout != USB3_LPM_DEVICE_INITIATED) { | |
3579 | dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, " | |
3580 | "which is a reserved value.\n", | |
3581 | usb3_lpm_names[state], timeout); | |
3582 | return -EINVAL; | |
3583 | } | |
3584 | ||
3585 | ret = set_port_feature(udev->parent, | |
3586 | USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum, | |
3587 | feature); | |
3588 | if (ret < 0) { | |
3589 | dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x," | |
3590 | "error code %i\n", usb3_lpm_names[state], | |
3591 | timeout, ret); | |
3592 | return -EBUSY; | |
3593 | } | |
3594 | if (state == USB3_LPM_U1) | |
3595 | udev->u1_params.timeout = timeout; | |
3596 | else | |
3597 | udev->u2_params.timeout = timeout; | |
3598 | return 0; | |
3599 | } | |
3600 | ||
3601 | /* | |
3602 | * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated | |
3603 | * U1/U2 entry. | |
3604 | * | |
3605 | * We will attempt to enable U1 or U2, but there are no guarantees that the | |
3606 | * control transfers to set the hub timeout or enable device-initiated U1/U2 | |
3607 | * will be successful. | |
3608 | * | |
3609 | * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI | |
3610 | * driver know about it. If that call fails, it should be harmless, and just | |
3611 | * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency. | |
3612 | */ | |
3613 | static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, | |
3614 | enum usb3_link_state state) | |
3615 | { | |
65a95b75 | 3616 | int timeout, ret; |
ae8963ad SS |
3617 | __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat; |
3618 | __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat; | |
3619 | ||
3620 | /* If the device says it doesn't have *any* exit latency to come out of | |
3621 | * U1 or U2, it's probably lying. Assume it doesn't implement that link | |
3622 | * state. | |
3623 | */ | |
3624 | if ((state == USB3_LPM_U1 && u1_mel == 0) || | |
3625 | (state == USB3_LPM_U2 && u2_mel == 0)) | |
3626 | return; | |
1ea7e0e8 | 3627 | |
65a95b75 SS |
3628 | /* |
3629 | * First, let the device know about the exit latencies | |
3630 | * associated with the link state we're about to enable. | |
3631 | */ | |
3632 | ret = usb_req_set_sel(udev, state); | |
3633 | if (ret < 0) { | |
3634 | dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n", | |
3635 | usb3_lpm_names[state]); | |
3636 | return; | |
3637 | } | |
3638 | ||
1ea7e0e8 SS |
3639 | /* We allow the host controller to set the U1/U2 timeout internally |
3640 | * first, so that it can change its schedule to account for the | |
3641 | * additional latency to send data to a device in a lower power | |
3642 | * link state. | |
3643 | */ | |
3644 | timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state); | |
3645 | ||
3646 | /* xHCI host controller doesn't want to enable this LPM state. */ | |
3647 | if (timeout == 0) | |
3648 | return; | |
3649 | ||
3650 | if (timeout < 0) { | |
3651 | dev_warn(&udev->dev, "Could not enable %s link state, " | |
3652 | "xHCI error %i.\n", usb3_lpm_names[state], | |
3653 | timeout); | |
3654 | return; | |
3655 | } | |
3656 | ||
3657 | if (usb_set_lpm_timeout(udev, state, timeout)) | |
3658 | /* If we can't set the parent hub U1/U2 timeout, | |
3659 | * device-initiated LPM won't be allowed either, so let the xHCI | |
3660 | * host know that this link state won't be enabled. | |
3661 | */ | |
3662 | hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); | |
3663 | ||
3664 | /* Only a configured device will accept the Set Feature U1/U2_ENABLE */ | |
3665 | else if (udev->actconfig) | |
3666 | usb_set_device_initiated_lpm(udev, state, true); | |
3667 | ||
3668 | } | |
3669 | ||
3670 | /* | |
3671 | * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated | |
3672 | * U1/U2 entry. | |
3673 | * | |
3674 | * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry. | |
3675 | * If zero is returned, the parent will not allow the link to go into U1/U2. | |
3676 | * | |
3677 | * If zero is returned, device-initiated U1/U2 entry may still be enabled, but | |
3678 | * it won't have an effect on the bus link state because the parent hub will | |
3679 | * still disallow device-initiated U1/U2 entry. | |
3680 | * | |
3681 | * If zero is returned, the xHCI host controller may still think U1/U2 entry is | |
3682 | * possible. The result will be slightly more bus bandwidth will be taken up | |
3683 | * (to account for U1/U2 exit latency), but it should be harmless. | |
3684 | */ | |
3685 | static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev, | |
3686 | enum usb3_link_state state) | |
3687 | { | |
3688 | int feature; | |
3689 | ||
3690 | switch (state) { | |
3691 | case USB3_LPM_U1: | |
3692 | feature = USB_PORT_FEAT_U1_TIMEOUT; | |
3693 | break; | |
3694 | case USB3_LPM_U2: | |
3695 | feature = USB_PORT_FEAT_U2_TIMEOUT; | |
3696 | break; | |
3697 | default: | |
3698 | dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n", | |
3699 | __func__); | |
3700 | return -EINVAL; | |
3701 | } | |
3702 | ||
3703 | if (usb_set_lpm_timeout(udev, state, 0)) | |
3704 | return -EBUSY; | |
3705 | ||
3706 | usb_set_device_initiated_lpm(udev, state, false); | |
3707 | ||
3708 | if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state)) | |
3709 | dev_warn(&udev->dev, "Could not disable xHCI %s timeout, " | |
3710 | "bus schedule bandwidth may be impacted.\n", | |
3711 | usb3_lpm_names[state]); | |
3712 | return 0; | |
3713 | } | |
3714 | ||
3715 | /* | |
3716 | * Disable hub-initiated and device-initiated U1 and U2 entry. | |
3717 | * Caller must own the bandwidth_mutex. | |
3718 | * | |
3719 | * This will call usb_enable_lpm() on failure, which will decrement | |
3720 | * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero. | |
3721 | */ | |
3722 | int usb_disable_lpm(struct usb_device *udev) | |
3723 | { | |
3724 | struct usb_hcd *hcd; | |
3725 | ||
3726 | if (!udev || !udev->parent || | |
3727 | udev->speed != USB_SPEED_SUPER || | |
3728 | !udev->lpm_capable) | |
3729 | return 0; | |
3730 | ||
3731 | hcd = bus_to_hcd(udev->bus); | |
3732 | if (!hcd || !hcd->driver->disable_usb3_lpm_timeout) | |
3733 | return 0; | |
3734 | ||
3735 | udev->lpm_disable_count++; | |
55558c33 | 3736 | if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0)) |
1ea7e0e8 SS |
3737 | return 0; |
3738 | ||
3739 | /* If LPM is enabled, attempt to disable it. */ | |
3740 | if (usb_disable_link_state(hcd, udev, USB3_LPM_U1)) | |
3741 | goto enable_lpm; | |
3742 | if (usb_disable_link_state(hcd, udev, USB3_LPM_U2)) | |
3743 | goto enable_lpm; | |
3744 | ||
3745 | return 0; | |
3746 | ||
3747 | enable_lpm: | |
3748 | usb_enable_lpm(udev); | |
3749 | return -EBUSY; | |
3750 | } | |
3751 | EXPORT_SYMBOL_GPL(usb_disable_lpm); | |
3752 | ||
3753 | /* Grab the bandwidth_mutex before calling usb_disable_lpm() */ | |
3754 | int usb_unlocked_disable_lpm(struct usb_device *udev) | |
3755 | { | |
3756 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
3757 | int ret; | |
3758 | ||
3759 | if (!hcd) | |
3760 | return -EINVAL; | |
3761 | ||
3762 | mutex_lock(hcd->bandwidth_mutex); | |
3763 | ret = usb_disable_lpm(udev); | |
3764 | mutex_unlock(hcd->bandwidth_mutex); | |
3765 | ||
3766 | return ret; | |
3767 | } | |
3768 | EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); | |
3769 | ||
3770 | /* | |
3771 | * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The | |
3772 | * xHCI host policy may prevent U1 or U2 from being enabled. | |
3773 | * | |
3774 | * Other callers may have disabled link PM, so U1 and U2 entry will be disabled | |
3775 | * until the lpm_disable_count drops to zero. Caller must own the | |
3776 | * bandwidth_mutex. | |
3777 | */ | |
3778 | void usb_enable_lpm(struct usb_device *udev) | |
3779 | { | |
3780 | struct usb_hcd *hcd; | |
3781 | ||
3782 | if (!udev || !udev->parent || | |
3783 | udev->speed != USB_SPEED_SUPER || | |
3784 | !udev->lpm_capable) | |
3785 | return; | |
3786 | ||
3787 | udev->lpm_disable_count--; | |
3788 | hcd = bus_to_hcd(udev->bus); | |
3789 | /* Double check that we can both enable and disable LPM. | |
3790 | * Device must be configured to accept set feature U1/U2 timeout. | |
3791 | */ | |
3792 | if (!hcd || !hcd->driver->enable_usb3_lpm_timeout || | |
3793 | !hcd->driver->disable_usb3_lpm_timeout) | |
3794 | return; | |
3795 | ||
3796 | if (udev->lpm_disable_count > 0) | |
3797 | return; | |
3798 | ||
3799 | usb_enable_link_state(hcd, udev, USB3_LPM_U1); | |
3800 | usb_enable_link_state(hcd, udev, USB3_LPM_U2); | |
3801 | } | |
3802 | EXPORT_SYMBOL_GPL(usb_enable_lpm); | |
3803 | ||
3804 | /* Grab the bandwidth_mutex before calling usb_enable_lpm() */ | |
3805 | void usb_unlocked_enable_lpm(struct usb_device *udev) | |
3806 | { | |
3807 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
3808 | ||
3809 | if (!hcd) | |
3810 | return; | |
3811 | ||
3812 | mutex_lock(hcd->bandwidth_mutex); | |
3813 | usb_enable_lpm(udev); | |
3814 | mutex_unlock(hcd->bandwidth_mutex); | |
3815 | } | |
3816 | EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); | |
3817 | ||
3818 | ||
d388dab7 AS |
3819 | #else /* CONFIG_PM */ |
3820 | ||
f07600cf AS |
3821 | #define hub_suspend NULL |
3822 | #define hub_resume NULL | |
3823 | #define hub_reset_resume NULL | |
1ea7e0e8 SS |
3824 | |
3825 | int usb_disable_lpm(struct usb_device *udev) | |
3826 | { | |
3827 | return 0; | |
3828 | } | |
e9261fb6 | 3829 | EXPORT_SYMBOL_GPL(usb_disable_lpm); |
1ea7e0e8 SS |
3830 | |
3831 | void usb_enable_lpm(struct usb_device *udev) { } | |
e9261fb6 | 3832 | EXPORT_SYMBOL_GPL(usb_enable_lpm); |
1ea7e0e8 SS |
3833 | |
3834 | int usb_unlocked_disable_lpm(struct usb_device *udev) | |
3835 | { | |
3836 | return 0; | |
3837 | } | |
e9261fb6 | 3838 | EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); |
1ea7e0e8 SS |
3839 | |
3840 | void usb_unlocked_enable_lpm(struct usb_device *udev) { } | |
e9261fb6 | 3841 | EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); |
f74631e3 SS |
3842 | |
3843 | int usb_disable_ltm(struct usb_device *udev) | |
3844 | { | |
3845 | return 0; | |
3846 | } | |
3847 | EXPORT_SYMBOL_GPL(usb_disable_ltm); | |
3848 | ||
3849 | void usb_enable_ltm(struct usb_device *udev) { } | |
3850 | EXPORT_SYMBOL_GPL(usb_enable_ltm); | |
d388dab7 AS |
3851 | #endif |
3852 | ||
1da177e4 LT |
3853 | |
3854 | /* USB 2.0 spec, 7.1.7.3 / fig 7-29: | |
3855 | * | |
3856 | * Between connect detection and reset signaling there must be a delay | |
3857 | * of 100ms at least for debounce and power-settling. The corresponding | |
3858 | * timer shall restart whenever the downstream port detects a disconnect. | |
3859 | * | |
3860 | * Apparently there are some bluetooth and irda-dongles and a number of | |
3861 | * low-speed devices for which this debounce period may last over a second. | |
3862 | * Not covered by the spec - but easy to deal with. | |
3863 | * | |
3864 | * This implementation uses a 1500ms total debounce timeout; if the | |
3865 | * connection isn't stable by then it returns -ETIMEDOUT. It checks | |
3866 | * every 25ms for transient disconnects. When the port status has been | |
3867 | * unchanged for 100ms it returns the port status. | |
3868 | */ | |
ad493e5e | 3869 | int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected) |
1da177e4 LT |
3870 | { |
3871 | int ret; | |
3872 | int total_time, stable_time = 0; | |
3873 | u16 portchange, portstatus; | |
3874 | unsigned connection = 0xffff; | |
3875 | ||
3876 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { | |
3877 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
3878 | if (ret < 0) | |
3879 | return ret; | |
3880 | ||
3881 | if (!(portchange & USB_PORT_STAT_C_CONNECTION) && | |
3882 | (portstatus & USB_PORT_STAT_CONNECTION) == connection) { | |
ad493e5e LT |
3883 | if (!must_be_connected || |
3884 | (connection == USB_PORT_STAT_CONNECTION)) | |
3885 | stable_time += HUB_DEBOUNCE_STEP; | |
1da177e4 LT |
3886 | if (stable_time >= HUB_DEBOUNCE_STABLE) |
3887 | break; | |
3888 | } else { | |
3889 | stable_time = 0; | |
3890 | connection = portstatus & USB_PORT_STAT_CONNECTION; | |
3891 | } | |
3892 | ||
3893 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
ad493e5e | 3894 | usb_clear_port_feature(hub->hdev, port1, |
1da177e4 LT |
3895 | USB_PORT_FEAT_C_CONNECTION); |
3896 | } | |
3897 | ||
3898 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
3899 | break; | |
3900 | msleep(HUB_DEBOUNCE_STEP); | |
3901 | } | |
3902 | ||
3903 | dev_dbg (hub->intfdev, | |
3904 | "debounce: port %d: total %dms stable %dms status 0x%x\n", | |
3905 | port1, total_time, stable_time, portstatus); | |
3906 | ||
3907 | if (stable_time < HUB_DEBOUNCE_STABLE) | |
3908 | return -ETIMEDOUT; | |
3909 | return portstatus; | |
3910 | } | |
3911 | ||
fc721f51 | 3912 | void usb_ep0_reinit(struct usb_device *udev) |
1da177e4 | 3913 | { |
ddeac4e7 AS |
3914 | usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); |
3915 | usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); | |
2caf7fcd | 3916 | usb_enable_endpoint(udev, &udev->ep0, true); |
1da177e4 | 3917 | } |
fc721f51 | 3918 | EXPORT_SYMBOL_GPL(usb_ep0_reinit); |
1da177e4 LT |
3919 | |
3920 | #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) | |
3921 | #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) | |
3922 | ||
4326ed0b | 3923 | static int hub_set_address(struct usb_device *udev, int devnum) |
1da177e4 LT |
3924 | { |
3925 | int retval; | |
c6515272 | 3926 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 3927 | |
c6515272 SS |
3928 | /* |
3929 | * The host controller will choose the device address, | |
3930 | * instead of the core having chosen it earlier | |
3931 | */ | |
3932 | if (!hcd->driver->address_device && devnum <= 1) | |
1da177e4 LT |
3933 | return -EINVAL; |
3934 | if (udev->state == USB_STATE_ADDRESS) | |
3935 | return 0; | |
3936 | if (udev->state != USB_STATE_DEFAULT) | |
3937 | return -EINVAL; | |
c8d4af8e | 3938 | if (hcd->driver->address_device) |
c6515272 | 3939 | retval = hcd->driver->address_device(hcd, udev); |
c8d4af8e | 3940 | else |
c6515272 SS |
3941 | retval = usb_control_msg(udev, usb_sndaddr0pipe(), |
3942 | USB_REQ_SET_ADDRESS, 0, devnum, 0, | |
3943 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
1da177e4 | 3944 | if (retval == 0) { |
3b29b68b | 3945 | update_devnum(udev, devnum); |
4953d141 | 3946 | /* Device now using proper address. */ |
1da177e4 | 3947 | usb_set_device_state(udev, USB_STATE_ADDRESS); |
fc721f51 | 3948 | usb_ep0_reinit(udev); |
1da177e4 LT |
3949 | } |
3950 | return retval; | |
3951 | } | |
3952 | ||
3953 | /* Reset device, (re)assign address, get device descriptor. | |
3954 | * Device connection must be stable, no more debouncing needed. | |
3955 | * Returns device in USB_STATE_ADDRESS, except on error. | |
3956 | * | |
3957 | * If this is called for an already-existing device (as part of | |
742120c6 | 3958 | * usb_reset_and_verify_device), the caller must own the device lock. For a |
1da177e4 LT |
3959 | * newly detected device that is not accessible through any global |
3960 | * pointers, it's not necessary to lock the device. | |
3961 | */ | |
3962 | static int | |
3963 | hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, | |
3964 | int retry_counter) | |
3965 | { | |
4186ecf8 | 3966 | static DEFINE_MUTEX(usb_address0_mutex); |
1da177e4 LT |
3967 | |
3968 | struct usb_device *hdev = hub->hdev; | |
e7b77172 | 3969 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
1da177e4 LT |
3970 | int i, j, retval; |
3971 | unsigned delay = HUB_SHORT_RESET_TIME; | |
3972 | enum usb_device_speed oldspeed = udev->speed; | |
e538dfda | 3973 | const char *speed; |
4326ed0b | 3974 | int devnum = udev->devnum; |
1da177e4 LT |
3975 | |
3976 | /* root hub ports have a slightly longer reset period | |
3977 | * (from USB 2.0 spec, section 7.1.7.5) | |
3978 | */ | |
3979 | if (!hdev->parent) { | |
3980 | delay = HUB_ROOT_RESET_TIME; | |
3981 | if (port1 == hdev->bus->otg_port) | |
3982 | hdev->bus->b_hnp_enable = 0; | |
3983 | } | |
3984 | ||
3985 | /* Some low speed devices have problems with the quick delay, so */ | |
3986 | /* be a bit pessimistic with those devices. RHbug #23670 */ | |
3987 | if (oldspeed == USB_SPEED_LOW) | |
3988 | delay = HUB_LONG_RESET_TIME; | |
3989 | ||
4186ecf8 | 3990 | mutex_lock(&usb_address0_mutex); |
1da177e4 | 3991 | |
07194ab7 LT |
3992 | /* Reset the device; full speed may morph to high speed */ |
3993 | /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ | |
75d7cf72 | 3994 | retval = hub_port_reset(hub, port1, udev, delay, false); |
07194ab7 LT |
3995 | if (retval < 0) /* error or disconnect */ |
3996 | goto fail; | |
3997 | /* success, speed is known */ | |
3998 | ||
1da177e4 LT |
3999 | retval = -ENODEV; |
4000 | ||
4001 | if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { | |
4002 | dev_dbg(&udev->dev, "device reset changed speed!\n"); | |
4003 | goto fail; | |
4004 | } | |
4005 | oldspeed = udev->speed; | |
4326ed0b | 4006 | |
1da177e4 LT |
4007 | /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... |
4008 | * it's fixed size except for full speed devices. | |
5bb6e0ae IPG |
4009 | * For Wireless USB devices, ep0 max packet is always 512 (tho |
4010 | * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. | |
1da177e4 LT |
4011 | */ |
4012 | switch (udev->speed) { | |
6b403b02 | 4013 | case USB_SPEED_SUPER: |
551cdbbe | 4014 | case USB_SPEED_WIRELESS: /* fixed at 512 */ |
551509d2 | 4015 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); |
5bb6e0ae | 4016 | break; |
1da177e4 | 4017 | case USB_SPEED_HIGH: /* fixed at 64 */ |
551509d2 | 4018 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
4019 | break; |
4020 | case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ | |
4021 | /* to determine the ep0 maxpacket size, try to read | |
4022 | * the device descriptor to get bMaxPacketSize0 and | |
4023 | * then correct our initial guess. | |
4024 | */ | |
551509d2 | 4025 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
4026 | break; |
4027 | case USB_SPEED_LOW: /* fixed at 8 */ | |
551509d2 | 4028 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); |
1da177e4 LT |
4029 | break; |
4030 | default: | |
4031 | goto fail; | |
4032 | } | |
e538dfda MN |
4033 | |
4034 | if (udev->speed == USB_SPEED_WIRELESS) | |
4035 | speed = "variable speed Wireless"; | |
4036 | else | |
4037 | speed = usb_speed_string(udev->speed); | |
4038 | ||
c6515272 SS |
4039 | if (udev->speed != USB_SPEED_SUPER) |
4040 | dev_info(&udev->dev, | |
e538dfda MN |
4041 | "%s %s USB device number %d using %s\n", |
4042 | (udev->config) ? "reset" : "new", speed, | |
3b29b68b | 4043 | devnum, udev->bus->controller->driver->name); |
1da177e4 LT |
4044 | |
4045 | /* Set up TT records, if needed */ | |
4046 | if (hdev->tt) { | |
4047 | udev->tt = hdev->tt; | |
4048 | udev->ttport = hdev->ttport; | |
4049 | } else if (udev->speed != USB_SPEED_HIGH | |
4050 | && hdev->speed == USB_SPEED_HIGH) { | |
d199c96d AS |
4051 | if (!hub->tt.hub) { |
4052 | dev_err(&udev->dev, "parent hub has no TT\n"); | |
4053 | retval = -EINVAL; | |
4054 | goto fail; | |
4055 | } | |
1da177e4 LT |
4056 | udev->tt = &hub->tt; |
4057 | udev->ttport = port1; | |
4058 | } | |
4059 | ||
4060 | /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? | |
4061 | * Because device hardware and firmware is sometimes buggy in | |
4062 | * this area, and this is how Linux has done it for ages. | |
4063 | * Change it cautiously. | |
4064 | * | |
4065 | * NOTE: If USE_NEW_SCHEME() is true we will start by issuing | |
4066 | * a 64-byte GET_DESCRIPTOR request. This is what Windows does, | |
4067 | * so it may help with some non-standards-compliant devices. | |
4068 | * Otherwise we start with SET_ADDRESS and then try to read the | |
4069 | * first 8 bytes of the device descriptor to get the ep0 maxpacket | |
4070 | * value. | |
4071 | */ | |
4072 | for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { | |
c6515272 | 4073 | if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) { |
1da177e4 LT |
4074 | struct usb_device_descriptor *buf; |
4075 | int r = 0; | |
4076 | ||
4077 | #define GET_DESCRIPTOR_BUFSIZE 64 | |
4078 | buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); | |
4079 | if (!buf) { | |
4080 | retval = -ENOMEM; | |
4081 | continue; | |
4082 | } | |
4083 | ||
b89ee19a AS |
4084 | /* Retry on all errors; some devices are flakey. |
4085 | * 255 is for WUSB devices, we actually need to use | |
4086 | * 512 (WUSB1.0[4.8.1]). | |
1da177e4 LT |
4087 | */ |
4088 | for (j = 0; j < 3; ++j) { | |
4089 | buf->bMaxPacketSize0 = 0; | |
4090 | r = usb_control_msg(udev, usb_rcvaddr0pipe(), | |
4091 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, | |
4092 | USB_DT_DEVICE << 8, 0, | |
4093 | buf, GET_DESCRIPTOR_BUFSIZE, | |
fd7c519d | 4094 | initial_descriptor_timeout); |
1da177e4 | 4095 | switch (buf->bMaxPacketSize0) { |
5bb6e0ae | 4096 | case 8: case 16: case 32: case 64: case 255: |
1da177e4 LT |
4097 | if (buf->bDescriptorType == |
4098 | USB_DT_DEVICE) { | |
4099 | r = 0; | |
4100 | break; | |
4101 | } | |
4102 | /* FALL THROUGH */ | |
4103 | default: | |
4104 | if (r == 0) | |
4105 | r = -EPROTO; | |
4106 | break; | |
4107 | } | |
4108 | if (r == 0) | |
4109 | break; | |
4110 | } | |
4111 | udev->descriptor.bMaxPacketSize0 = | |
4112 | buf->bMaxPacketSize0; | |
4113 | kfree(buf); | |
4114 | ||
75d7cf72 | 4115 | retval = hub_port_reset(hub, port1, udev, delay, false); |
1da177e4 LT |
4116 | if (retval < 0) /* error or disconnect */ |
4117 | goto fail; | |
4118 | if (oldspeed != udev->speed) { | |
4119 | dev_dbg(&udev->dev, | |
4120 | "device reset changed speed!\n"); | |
4121 | retval = -ENODEV; | |
4122 | goto fail; | |
4123 | } | |
4124 | if (r) { | |
e9e88fb7 AS |
4125 | if (r != -ENODEV) |
4126 | dev_err(&udev->dev, "device descriptor read/64, error %d\n", | |
4127 | r); | |
1da177e4 LT |
4128 | retval = -EMSGSIZE; |
4129 | continue; | |
4130 | } | |
4131 | #undef GET_DESCRIPTOR_BUFSIZE | |
4132 | } | |
4133 | ||
6c529cdc IPG |
4134 | /* |
4135 | * If device is WUSB, we already assigned an | |
4136 | * unauthorized address in the Connect Ack sequence; | |
4137 | * authorization will assign the final address. | |
4138 | */ | |
c6515272 | 4139 | if (udev->wusb == 0) { |
6c529cdc IPG |
4140 | for (j = 0; j < SET_ADDRESS_TRIES; ++j) { |
4141 | retval = hub_set_address(udev, devnum); | |
4142 | if (retval >= 0) | |
4143 | break; | |
4144 | msleep(200); | |
4145 | } | |
4146 | if (retval < 0) { | |
e9e88fb7 AS |
4147 | if (retval != -ENODEV) |
4148 | dev_err(&udev->dev, "device not accepting address %d, error %d\n", | |
4149 | devnum, retval); | |
6c529cdc IPG |
4150 | goto fail; |
4151 | } | |
c6515272 SS |
4152 | if (udev->speed == USB_SPEED_SUPER) { |
4153 | devnum = udev->devnum; | |
4154 | dev_info(&udev->dev, | |
3b29b68b | 4155 | "%s SuperSpeed USB device number %d using %s\n", |
c6515272 | 4156 | (udev->config) ? "reset" : "new", |
3b29b68b | 4157 | devnum, udev->bus->controller->driver->name); |
c6515272 | 4158 | } |
6c529cdc IPG |
4159 | |
4160 | /* cope with hardware quirkiness: | |
4161 | * - let SET_ADDRESS settle, some device hardware wants it | |
4162 | * - read ep0 maxpacket even for high and low speed, | |
4163 | */ | |
4164 | msleep(10); | |
c6515272 | 4165 | if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) |
1da177e4 | 4166 | break; |
6c529cdc | 4167 | } |
1da177e4 LT |
4168 | |
4169 | retval = usb_get_device_descriptor(udev, 8); | |
4170 | if (retval < 8) { | |
e9e88fb7 AS |
4171 | if (retval != -ENODEV) |
4172 | dev_err(&udev->dev, | |
b9cef6c3 WF |
4173 | "device descriptor read/8, error %d\n", |
4174 | retval); | |
1da177e4 LT |
4175 | if (retval >= 0) |
4176 | retval = -EMSGSIZE; | |
4177 | } else { | |
4178 | retval = 0; | |
4179 | break; | |
4180 | } | |
4181 | } | |
4182 | if (retval) | |
4183 | goto fail; | |
4184 | ||
b76baa81 | 4185 | if (hcd->phy && !hdev->parent) |
ac96511b | 4186 | usb_phy_notify_connect(hcd->phy, udev->speed); |
b76baa81 | 4187 | |
d8aec3db EF |
4188 | /* |
4189 | * Some superspeed devices have finished the link training process | |
4190 | * and attached to a superspeed hub port, but the device descriptor | |
4191 | * got from those devices show they aren't superspeed devices. Warm | |
4192 | * reset the port attached by the devices can fix them. | |
4193 | */ | |
4194 | if ((udev->speed == USB_SPEED_SUPER) && | |
4195 | (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) { | |
4196 | dev_err(&udev->dev, "got a wrong device descriptor, " | |
4197 | "warm reset device\n"); | |
4198 | hub_port_reset(hub, port1, udev, | |
4199 | HUB_BH_RESET_TIME, true); | |
4200 | retval = -EINVAL; | |
4201 | goto fail; | |
4202 | } | |
4203 | ||
6b403b02 SS |
4204 | if (udev->descriptor.bMaxPacketSize0 == 0xff || |
4205 | udev->speed == USB_SPEED_SUPER) | |
4206 | i = 512; | |
4207 | else | |
4208 | i = udev->descriptor.bMaxPacketSize0; | |
29cc8897 | 4209 | if (usb_endpoint_maxp(&udev->ep0.desc) != i) { |
56626a72 | 4210 | if (udev->speed == USB_SPEED_LOW || |
1da177e4 | 4211 | !(i == 8 || i == 16 || i == 32 || i == 64)) { |
56626a72 | 4212 | dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); |
1da177e4 LT |
4213 | retval = -EMSGSIZE; |
4214 | goto fail; | |
4215 | } | |
56626a72 AS |
4216 | if (udev->speed == USB_SPEED_FULL) |
4217 | dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); | |
4218 | else | |
4219 | dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); | |
1da177e4 | 4220 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); |
fc721f51 | 4221 | usb_ep0_reinit(udev); |
1da177e4 LT |
4222 | } |
4223 | ||
4224 | retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); | |
4225 | if (retval < (signed)sizeof(udev->descriptor)) { | |
e9e88fb7 AS |
4226 | if (retval != -ENODEV) |
4227 | dev_err(&udev->dev, "device descriptor read/all, error %d\n", | |
4228 | retval); | |
1da177e4 LT |
4229 | if (retval >= 0) |
4230 | retval = -ENOMSG; | |
4231 | goto fail; | |
4232 | } | |
4233 | ||
1ff4df56 AX |
4234 | if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { |
4235 | retval = usb_get_bos_descriptor(udev); | |
51e0a012 | 4236 | if (!retval) { |
d9b2099c | 4237 | udev->lpm_capable = usb_device_supports_lpm(udev); |
51e0a012 SS |
4238 | usb_set_lpm_parameters(udev); |
4239 | } | |
1ff4df56 | 4240 | } |
3148bf04 | 4241 | |
1da177e4 | 4242 | retval = 0; |
48f24970 AD |
4243 | /* notify HCD that we have a device connected and addressed */ |
4244 | if (hcd->driver->update_device) | |
4245 | hcd->driver->update_device(hcd, udev); | |
1da177e4 | 4246 | fail: |
4326ed0b | 4247 | if (retval) { |
1da177e4 | 4248 | hub_port_disable(hub, port1, 0); |
3b29b68b | 4249 | update_devnum(udev, devnum); /* for disconnect processing */ |
4326ed0b | 4250 | } |
4186ecf8 | 4251 | mutex_unlock(&usb_address0_mutex); |
1da177e4 LT |
4252 | return retval; |
4253 | } | |
4254 | ||
4255 | static void | |
4256 | check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) | |
4257 | { | |
4258 | struct usb_qualifier_descriptor *qual; | |
4259 | int status; | |
4260 | ||
e94b1766 | 4261 | qual = kmalloc (sizeof *qual, GFP_KERNEL); |
1da177e4 LT |
4262 | if (qual == NULL) |
4263 | return; | |
4264 | ||
4265 | status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, | |
4266 | qual, sizeof *qual); | |
4267 | if (status == sizeof *qual) { | |
4268 | dev_info(&udev->dev, "not running at top speed; " | |
4269 | "connect to a high speed hub\n"); | |
4270 | /* hub LEDs are probably harder to miss than syslog */ | |
4271 | if (hub->has_indicators) { | |
4272 | hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; | |
c4028958 | 4273 | schedule_delayed_work (&hub->leds, 0); |
1da177e4 LT |
4274 | } |
4275 | } | |
1bc3c9e1 | 4276 | kfree(qual); |
1da177e4 LT |
4277 | } |
4278 | ||
4279 | static unsigned | |
4280 | hub_power_remaining (struct usb_hub *hub) | |
4281 | { | |
4282 | struct usb_device *hdev = hub->hdev; | |
4283 | int remaining; | |
55c52718 | 4284 | int port1; |
1da177e4 | 4285 | |
55c52718 | 4286 | if (!hub->limited_power) |
1da177e4 LT |
4287 | return 0; |
4288 | ||
55c52718 AS |
4289 | remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; |
4290 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
ff823c79 | 4291 | struct usb_device *udev = hub->ports[port1 - 1]->child; |
55c52718 | 4292 | int delta; |
430ee58e | 4293 | unsigned unit_load; |
1da177e4 LT |
4294 | |
4295 | if (!udev) | |
4296 | continue; | |
430ee58e SAS |
4297 | if (hub_is_superspeed(udev)) |
4298 | unit_load = 150; | |
4299 | else | |
4300 | unit_load = 100; | |
1da177e4 | 4301 | |
430ee58e SAS |
4302 | /* |
4303 | * Unconfigured devices may not use more than one unit load, | |
4304 | * or 8mA for OTG ports | |
4305 | */ | |
1da177e4 | 4306 | if (udev->actconfig) |
8d8479db | 4307 | delta = usb_get_max_power(udev, udev->actconfig); |
55c52718 | 4308 | else if (port1 != udev->bus->otg_port || hdev->parent) |
430ee58e | 4309 | delta = unit_load; |
1da177e4 | 4310 | else |
55c52718 AS |
4311 | delta = 8; |
4312 | if (delta > hub->mA_per_port) | |
b9cef6c3 WF |
4313 | dev_warn(&udev->dev, |
4314 | "%dmA is over %umA budget for port %d!\n", | |
4315 | delta, hub->mA_per_port, port1); | |
1da177e4 LT |
4316 | remaining -= delta; |
4317 | } | |
4318 | if (remaining < 0) { | |
55c52718 AS |
4319 | dev_warn(hub->intfdev, "%dmA over power budget!\n", |
4320 | - remaining); | |
1da177e4 LT |
4321 | remaining = 0; |
4322 | } | |
4323 | return remaining; | |
4324 | } | |
4325 | ||
4326 | /* Handle physical or logical connection change events. | |
4327 | * This routine is called when: | |
4328 | * a port connection-change occurs; | |
4329 | * a port enable-change occurs (often caused by EMI); | |
742120c6 | 4330 | * usb_reset_and_verify_device() encounters changed descriptors (as from |
1da177e4 LT |
4331 | * a firmware download) |
4332 | * caller already locked the hub | |
4333 | */ | |
4334 | static void hub_port_connect_change(struct usb_hub *hub, int port1, | |
4335 | u16 portstatus, u16 portchange) | |
4336 | { | |
4337 | struct usb_device *hdev = hub->hdev; | |
4338 | struct device *hub_dev = hub->intfdev; | |
90da096e | 4339 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
24618b0c AS |
4340 | unsigned wHubCharacteristics = |
4341 | le16_to_cpu(hub->descriptor->wHubCharacteristics); | |
8808f00c | 4342 | struct usb_device *udev; |
1da177e4 | 4343 | int status, i; |
430ee58e | 4344 | unsigned unit_load; |
24618b0c | 4345 | |
1da177e4 LT |
4346 | dev_dbg (hub_dev, |
4347 | "port %d, status %04x, change %04x, %s\n", | |
131dec34 | 4348 | port1, portstatus, portchange, portspeed(hub, portstatus)); |
1da177e4 LT |
4349 | |
4350 | if (hub->has_indicators) { | |
4351 | set_port_led(hub, port1, HUB_LED_AUTO); | |
4352 | hub->indicator[port1-1] = INDICATOR_AUTO; | |
4353 | } | |
1da177e4 LT |
4354 | |
4355 | #ifdef CONFIG_USB_OTG | |
4356 | /* during HNP, don't repeat the debounce */ | |
4357 | if (hdev->bus->is_b_host) | |
24618b0c AS |
4358 | portchange &= ~(USB_PORT_STAT_C_CONNECTION | |
4359 | USB_PORT_STAT_C_ENABLE); | |
1da177e4 LT |
4360 | #endif |
4361 | ||
8808f00c | 4362 | /* Try to resuscitate an existing device */ |
ff823c79 | 4363 | udev = hub->ports[port1 - 1]->child; |
8808f00c AS |
4364 | if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && |
4365 | udev->state != USB_STATE_NOTATTACHED) { | |
8808f00c AS |
4366 | usb_lock_device(udev); |
4367 | if (portstatus & USB_PORT_STAT_ENABLE) { | |
4368 | status = 0; /* Nothing to do */ | |
8808f00c | 4369 | |
84ebc102 | 4370 | #ifdef CONFIG_PM_RUNTIME |
5257d97a AS |
4371 | } else if (udev->state == USB_STATE_SUSPENDED && |
4372 | udev->persist_enabled) { | |
8808f00c AS |
4373 | /* For a suspended device, treat this as a |
4374 | * remote wakeup event. | |
4375 | */ | |
0534d468 | 4376 | status = usb_remote_wakeup(udev); |
8808f00c AS |
4377 | #endif |
4378 | ||
4379 | } else { | |
5257d97a | 4380 | status = -ENODEV; /* Don't resuscitate */ |
8808f00c AS |
4381 | } |
4382 | usb_unlock_device(udev); | |
4383 | ||
4384 | if (status == 0) { | |
4385 | clear_bit(port1, hub->change_bits); | |
4386 | return; | |
4387 | } | |
4388 | } | |
4389 | ||
24618b0c | 4390 | /* Disconnect any existing devices under this port */ |
b76baa81 PC |
4391 | if (udev) { |
4392 | if (hcd->phy && !hdev->parent && | |
4393 | !(portstatus & USB_PORT_STAT_CONNECTION)) | |
ac96511b | 4394 | usb_phy_notify_disconnect(hcd->phy, udev->speed); |
ff823c79 | 4395 | usb_disconnect(&hub->ports[port1 - 1]->child); |
b76baa81 | 4396 | } |
24618b0c AS |
4397 | clear_bit(port1, hub->change_bits); |
4398 | ||
253e0572 AS |
4399 | /* We can forget about a "removed" device when there's a physical |
4400 | * disconnect or the connect status changes. | |
4401 | */ | |
4402 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
4403 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
4404 | clear_bit(port1, hub->removed_bits); | |
4405 | ||
5257d97a AS |
4406 | if (portchange & (USB_PORT_STAT_C_CONNECTION | |
4407 | USB_PORT_STAT_C_ENABLE)) { | |
ad493e5e | 4408 | status = hub_port_debounce_be_stable(hub, port1); |
5257d97a | 4409 | if (status < 0) { |
e9e88fb7 | 4410 | if (status != -ENODEV && printk_ratelimit()) |
5257d97a AS |
4411 | dev_err(hub_dev, "connect-debounce failed, " |
4412 | "port %d disabled\n", port1); | |
4413 | portstatus &= ~USB_PORT_STAT_CONNECTION; | |
4414 | } else { | |
4415 | portstatus = status; | |
4416 | } | |
4417 | } | |
4418 | ||
253e0572 AS |
4419 | /* Return now if debouncing failed or nothing is connected or |
4420 | * the device was "removed". | |
4421 | */ | |
4422 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
4423 | test_bit(port1, hub->removed_bits)) { | |
1da177e4 LT |
4424 | |
4425 | /* maybe switch power back on (e.g. root hub was reset) */ | |
74ad9bd2 | 4426 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 |
0ed9a57e | 4427 | && !port_is_power_on(hub, portstatus)) |
1da177e4 | 4428 | set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
5257d97a | 4429 | |
1da177e4 LT |
4430 | if (portstatus & USB_PORT_STAT_ENABLE) |
4431 | goto done; | |
4432 | return; | |
4433 | } | |
430ee58e SAS |
4434 | if (hub_is_superspeed(hub->hdev)) |
4435 | unit_load = 150; | |
4436 | else | |
4437 | unit_load = 100; | |
1da177e4 | 4438 | |
e9e88fb7 | 4439 | status = 0; |
1da177e4 | 4440 | for (i = 0; i < SET_CONFIG_TRIES; i++) { |
1da177e4 LT |
4441 | |
4442 | /* reallocate for each attempt, since references | |
4443 | * to the previous one can escape in various ways | |
4444 | */ | |
4445 | udev = usb_alloc_dev(hdev, hdev->bus, port1); | |
4446 | if (!udev) { | |
4447 | dev_err (hub_dev, | |
4448 | "couldn't allocate port %d usb_device\n", | |
4449 | port1); | |
4450 | goto done; | |
4451 | } | |
4452 | ||
4453 | usb_set_device_state(udev, USB_STATE_POWERED); | |
55c52718 | 4454 | udev->bus_mA = hub->mA_per_port; |
b6956ffa | 4455 | udev->level = hdev->level + 1; |
8af548dc | 4456 | udev->wusb = hub_is_wusb(hub); |
55c52718 | 4457 | |
131dec34 SS |
4458 | /* Only USB 3.0 devices are connected to SuperSpeed hubs. */ |
4459 | if (hub_is_superspeed(hub->hdev)) | |
e7b77172 SS |
4460 | udev->speed = USB_SPEED_SUPER; |
4461 | else | |
4462 | udev->speed = USB_SPEED_UNKNOWN; | |
4463 | ||
3b29b68b | 4464 | choose_devnum(udev); |
c8d4af8e AX |
4465 | if (udev->devnum <= 0) { |
4466 | status = -ENOTCONN; /* Don't retry */ | |
4467 | goto loop; | |
c6515272 SS |
4468 | } |
4469 | ||
e7b77172 | 4470 | /* reset (non-USB 3.0 devices) and get descriptor */ |
1da177e4 LT |
4471 | status = hub_port_init(hub, udev, port1, i); |
4472 | if (status < 0) | |
4473 | goto loop; | |
4474 | ||
93362a87 PD |
4475 | usb_detect_quirks(udev); |
4476 | if (udev->quirks & USB_QUIRK_DELAY_INIT) | |
4477 | msleep(1000); | |
4478 | ||
1da177e4 LT |
4479 | /* consecutive bus-powered hubs aren't reliable; they can |
4480 | * violate the voltage drop budget. if the new child has | |
4481 | * a "powered" LED, users should notice we didn't enable it | |
4482 | * (without reading syslog), even without per-port LEDs | |
4483 | * on the parent. | |
4484 | */ | |
4485 | if (udev->descriptor.bDeviceClass == USB_CLASS_HUB | |
430ee58e | 4486 | && udev->bus_mA <= unit_load) { |
1da177e4 LT |
4487 | u16 devstat; |
4488 | ||
4489 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, | |
4490 | &devstat); | |
55c52718 | 4491 | if (status < 2) { |
1da177e4 LT |
4492 | dev_dbg(&udev->dev, "get status %d ?\n", status); |
4493 | goto loop_disable; | |
4494 | } | |
55c52718 | 4495 | le16_to_cpus(&devstat); |
1da177e4 LT |
4496 | if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
4497 | dev_err(&udev->dev, | |
4498 | "can't connect bus-powered hub " | |
4499 | "to this port\n"); | |
4500 | if (hub->has_indicators) { | |
4501 | hub->indicator[port1-1] = | |
4502 | INDICATOR_AMBER_BLINK; | |
c4028958 | 4503 | schedule_delayed_work (&hub->leds, 0); |
1da177e4 LT |
4504 | } |
4505 | status = -ENOTCONN; /* Don't retry */ | |
4506 | goto loop_disable; | |
4507 | } | |
4508 | } | |
4509 | ||
4510 | /* check for devices running slower than they could */ | |
4511 | if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 | |
4512 | && udev->speed == USB_SPEED_FULL | |
4513 | && highspeed_hubs != 0) | |
4514 | check_highspeed (hub, udev, port1); | |
4515 | ||
fa286188 | 4516 | /* Store the parent's children[] pointer. At this point |
1da177e4 LT |
4517 | * udev becomes globally accessible, although presumably |
4518 | * no one will look at it until hdev is unlocked. | |
4519 | */ | |
1da177e4 LT |
4520 | status = 0; |
4521 | ||
4522 | /* We mustn't add new devices if the parent hub has | |
4523 | * been disconnected; we would race with the | |
4524 | * recursively_mark_NOTATTACHED() routine. | |
4525 | */ | |
4526 | spin_lock_irq(&device_state_lock); | |
4527 | if (hdev->state == USB_STATE_NOTATTACHED) | |
4528 | status = -ENOTCONN; | |
4529 | else | |
ff823c79 | 4530 | hub->ports[port1 - 1]->child = udev; |
1da177e4 LT |
4531 | spin_unlock_irq(&device_state_lock); |
4532 | ||
4533 | /* Run it through the hoops (find a driver, etc) */ | |
4534 | if (!status) { | |
4535 | status = usb_new_device(udev); | |
4536 | if (status) { | |
4537 | spin_lock_irq(&device_state_lock); | |
ff823c79 | 4538 | hub->ports[port1 - 1]->child = NULL; |
1da177e4 LT |
4539 | spin_unlock_irq(&device_state_lock); |
4540 | } | |
4541 | } | |
4542 | ||
1da177e4 LT |
4543 | if (status) |
4544 | goto loop_disable; | |
4545 | ||
4546 | status = hub_power_remaining(hub); | |
4547 | if (status) | |
55c52718 | 4548 | dev_dbg(hub_dev, "%dmA power budget left\n", status); |
1da177e4 LT |
4549 | |
4550 | return; | |
4551 | ||
4552 | loop_disable: | |
4553 | hub_port_disable(hub, port1, 1); | |
4554 | loop: | |
fc721f51 | 4555 | usb_ep0_reinit(udev); |
3b29b68b | 4556 | release_devnum(udev); |
f7410ced | 4557 | hub_free_dev(udev); |
1da177e4 | 4558 | usb_put_dev(udev); |
ffcdc18d | 4559 | if ((status == -ENOTCONN) || (status == -ENOTSUPP)) |
1da177e4 LT |
4560 | break; |
4561 | } | |
3a31155c AS |
4562 | if (hub->hdev->parent || |
4563 | !hcd->driver->port_handed_over || | |
e9e88fb7 AS |
4564 | !(hcd->driver->port_handed_over)(hcd, port1)) { |
4565 | if (status != -ENOTCONN && status != -ENODEV) | |
4566 | dev_err(hub_dev, "unable to enumerate USB device on port %d\n", | |
4567 | port1); | |
4568 | } | |
1da177e4 LT |
4569 | |
4570 | done: | |
4571 | hub_port_disable(hub, port1, 1); | |
90da096e BR |
4572 | if (hcd->driver->relinquish_port && !hub->hdev->parent) |
4573 | hcd->driver->relinquish_port(hcd, port1); | |
1da177e4 LT |
4574 | } |
4575 | ||
714b07be SS |
4576 | /* Returns 1 if there was a remote wakeup and a connect status change. */ |
4577 | static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, | |
72937e1e | 4578 | u16 portstatus, u16 portchange) |
714b07be SS |
4579 | { |
4580 | struct usb_device *hdev; | |
4581 | struct usb_device *udev; | |
4582 | int connect_change = 0; | |
4583 | int ret; | |
4584 | ||
4585 | hdev = hub->hdev; | |
ff823c79 | 4586 | udev = hub->ports[port - 1]->child; |
4ee823b8 SS |
4587 | if (!hub_is_superspeed(hdev)) { |
4588 | if (!(portchange & USB_PORT_STAT_C_SUSPEND)) | |
4589 | return 0; | |
ad493e5e | 4590 | usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND); |
4ee823b8 SS |
4591 | } else { |
4592 | if (!udev || udev->state != USB_STATE_SUSPENDED || | |
72937e1e SS |
4593 | (portstatus & USB_PORT_STAT_LINK_STATE) != |
4594 | USB_SS_PORT_LS_U0) | |
4ee823b8 SS |
4595 | return 0; |
4596 | } | |
4597 | ||
714b07be SS |
4598 | if (udev) { |
4599 | /* TRSMRCY = 10 msec */ | |
4600 | msleep(10); | |
4601 | ||
4602 | usb_lock_device(udev); | |
4603 | ret = usb_remote_wakeup(udev); | |
4604 | usb_unlock_device(udev); | |
4605 | if (ret < 0) | |
4606 | connect_change = 1; | |
4607 | } else { | |
4608 | ret = -ENODEV; | |
4609 | hub_port_disable(hub, port, 1); | |
4610 | } | |
4611 | dev_dbg(hub->intfdev, "resume on port %d, status %d\n", | |
4612 | port, ret); | |
4613 | return connect_change; | |
4614 | } | |
4615 | ||
1da177e4 LT |
4616 | static void hub_events(void) |
4617 | { | |
4618 | struct list_head *tmp; | |
4619 | struct usb_device *hdev; | |
4620 | struct usb_interface *intf; | |
4621 | struct usb_hub *hub; | |
4622 | struct device *hub_dev; | |
4623 | u16 hubstatus; | |
4624 | u16 hubchange; | |
4625 | u16 portstatus; | |
4626 | u16 portchange; | |
4627 | int i, ret; | |
4ee823b8 | 4628 | int connect_change, wakeup_change; |
1da177e4 LT |
4629 | |
4630 | /* | |
4631 | * We restart the list every time to avoid a deadlock with | |
4632 | * deleting hubs downstream from this one. This should be | |
4633 | * safe since we delete the hub from the event list. | |
4634 | * Not the most efficient, but avoids deadlocks. | |
4635 | */ | |
4636 | while (1) { | |
4637 | ||
4638 | /* Grab the first entry at the beginning of the list */ | |
4639 | spin_lock_irq(&hub_event_lock); | |
4640 | if (list_empty(&hub_event_list)) { | |
4641 | spin_unlock_irq(&hub_event_lock); | |
4642 | break; | |
4643 | } | |
4644 | ||
4645 | tmp = hub_event_list.next; | |
4646 | list_del_init(tmp); | |
4647 | ||
4648 | hub = list_entry(tmp, struct usb_hub, event_list); | |
e8054854 AS |
4649 | kref_get(&hub->kref); |
4650 | spin_unlock_irq(&hub_event_lock); | |
1da177e4 | 4651 | |
e8054854 AS |
4652 | hdev = hub->hdev; |
4653 | hub_dev = hub->intfdev; | |
4654 | intf = to_usb_interface(hub_dev); | |
40f122f3 | 4655 | dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", |
1da177e4 LT |
4656 | hdev->state, hub->descriptor |
4657 | ? hub->descriptor->bNbrPorts | |
4658 | : 0, | |
4659 | /* NOTE: expects max 15 ports... */ | |
4660 | (u16) hub->change_bits[0], | |
40f122f3 | 4661 | (u16) hub->event_bits[0]); |
1da177e4 | 4662 | |
1da177e4 LT |
4663 | /* Lock the device, then check to see if we were |
4664 | * disconnected while waiting for the lock to succeed. */ | |
06b84e8a | 4665 | usb_lock_device(hdev); |
e8054854 | 4666 | if (unlikely(hub->disconnected)) |
9bbdf1e0 | 4667 | goto loop_disconnected; |
1da177e4 LT |
4668 | |
4669 | /* If the hub has died, clean up after it */ | |
4670 | if (hdev->state == USB_STATE_NOTATTACHED) { | |
7de18d8b | 4671 | hub->error = -ENODEV; |
4330354f | 4672 | hub_quiesce(hub, HUB_DISCONNECT); |
1da177e4 LT |
4673 | goto loop; |
4674 | } | |
4675 | ||
40f122f3 AS |
4676 | /* Autoresume */ |
4677 | ret = usb_autopm_get_interface(intf); | |
4678 | if (ret) { | |
4679 | dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); | |
4680 | goto loop; | |
4681 | } | |
a8e7c565 | 4682 | |
40f122f3 | 4683 | /* If this is an inactive hub, do nothing */ |
1da177e4 | 4684 | if (hub->quiescing) |
40f122f3 | 4685 | goto loop_autopm; |
1da177e4 LT |
4686 | |
4687 | if (hub->error) { | |
4688 | dev_dbg (hub_dev, "resetting for error %d\n", | |
4689 | hub->error); | |
4690 | ||
742120c6 | 4691 | ret = usb_reset_device(hdev); |
1da177e4 LT |
4692 | if (ret) { |
4693 | dev_dbg (hub_dev, | |
4694 | "error resetting hub: %d\n", ret); | |
40f122f3 | 4695 | goto loop_autopm; |
1da177e4 LT |
4696 | } |
4697 | ||
4698 | hub->nerrors = 0; | |
4699 | hub->error = 0; | |
4700 | } | |
4701 | ||
4702 | /* deal with port status changes */ | |
4703 | for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { | |
4704 | if (test_bit(i, hub->busy_bits)) | |
4705 | continue; | |
4706 | connect_change = test_bit(i, hub->change_bits); | |
72937e1e | 4707 | wakeup_change = test_and_clear_bit(i, hub->wakeup_bits); |
1da177e4 | 4708 | if (!test_and_clear_bit(i, hub->event_bits) && |
4ee823b8 | 4709 | !connect_change && !wakeup_change) |
1da177e4 LT |
4710 | continue; |
4711 | ||
4712 | ret = hub_port_status(hub, i, | |
4713 | &portstatus, &portchange); | |
4714 | if (ret < 0) | |
4715 | continue; | |
4716 | ||
1da177e4 | 4717 | if (portchange & USB_PORT_STAT_C_CONNECTION) { |
ad493e5e | 4718 | usb_clear_port_feature(hdev, i, |
1da177e4 LT |
4719 | USB_PORT_FEAT_C_CONNECTION); |
4720 | connect_change = 1; | |
4721 | } | |
4722 | ||
4723 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
4724 | if (!connect_change) | |
4725 | dev_dbg (hub_dev, | |
4726 | "port %d enable change, " | |
4727 | "status %08x\n", | |
4728 | i, portstatus); | |
ad493e5e | 4729 | usb_clear_port_feature(hdev, i, |
1da177e4 LT |
4730 | USB_PORT_FEAT_C_ENABLE); |
4731 | ||
4732 | /* | |
4733 | * EM interference sometimes causes badly | |
4734 | * shielded USB devices to be shutdown by | |
4735 | * the hub, this hack enables them again. | |
4736 | * Works at least with mouse driver. | |
4737 | */ | |
4738 | if (!(portstatus & USB_PORT_STAT_ENABLE) | |
4739 | && !connect_change | |
ff823c79 | 4740 | && hub->ports[i - 1]->child) { |
1da177e4 LT |
4741 | dev_err (hub_dev, |
4742 | "port %i " | |
4743 | "disabled by hub (EMI?), " | |
4744 | "re-enabling...\n", | |
4745 | i); | |
4746 | connect_change = 1; | |
4747 | } | |
4748 | } | |
4749 | ||
72937e1e SS |
4750 | if (hub_handle_remote_wakeup(hub, i, |
4751 | portstatus, portchange)) | |
714b07be | 4752 | connect_change = 1; |
8808f00c | 4753 | |
1da177e4 | 4754 | if (portchange & USB_PORT_STAT_C_OVERCURRENT) { |
752d57a8 PB |
4755 | u16 status = 0; |
4756 | u16 unused; | |
4757 | ||
4758 | dev_dbg(hub_dev, "over-current change on port " | |
4759 | "%d\n", i); | |
ad493e5e | 4760 | usb_clear_port_feature(hdev, i, |
1da177e4 | 4761 | USB_PORT_FEAT_C_OVER_CURRENT); |
752d57a8 | 4762 | msleep(100); /* Cool down */ |
8520f380 | 4763 | hub_power_on(hub, true); |
752d57a8 PB |
4764 | hub_port_status(hub, i, &status, &unused); |
4765 | if (status & USB_PORT_STAT_OVERCURRENT) | |
4766 | dev_err(hub_dev, "over-current " | |
4767 | "condition on port %d\n", i); | |
1da177e4 LT |
4768 | } |
4769 | ||
4770 | if (portchange & USB_PORT_STAT_C_RESET) { | |
4771 | dev_dbg (hub_dev, | |
4772 | "reset change on port %d\n", | |
4773 | i); | |
ad493e5e | 4774 | usb_clear_port_feature(hdev, i, |
1da177e4 LT |
4775 | USB_PORT_FEAT_C_RESET); |
4776 | } | |
c7061574 SS |
4777 | if ((portchange & USB_PORT_STAT_C_BH_RESET) && |
4778 | hub_is_superspeed(hub->hdev)) { | |
4779 | dev_dbg(hub_dev, | |
4780 | "warm reset change on port %d\n", | |
4781 | i); | |
ad493e5e | 4782 | usb_clear_port_feature(hdev, i, |
c7061574 SS |
4783 | USB_PORT_FEAT_C_BH_PORT_RESET); |
4784 | } | |
dbe79bbe | 4785 | if (portchange & USB_PORT_STAT_C_LINK_STATE) { |
ad493e5e | 4786 | usb_clear_port_feature(hub->hdev, i, |
dbe79bbe JY |
4787 | USB_PORT_FEAT_C_PORT_LINK_STATE); |
4788 | } | |
4789 | if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { | |
4790 | dev_warn(hub_dev, | |
4791 | "config error on port %d\n", | |
4792 | i); | |
ad493e5e | 4793 | usb_clear_port_feature(hub->hdev, i, |
dbe79bbe JY |
4794 | USB_PORT_FEAT_C_PORT_CONFIG_ERROR); |
4795 | } | |
1da177e4 | 4796 | |
5e467f6e AX |
4797 | /* Warm reset a USB3 protocol port if it's in |
4798 | * SS.Inactive state. | |
4799 | */ | |
8bea2bd3 | 4800 | if (hub_port_warm_reset_required(hub, portstatus)) { |
65bdac5e | 4801 | int status; |
d3b9d7a9 SS |
4802 | struct usb_device *udev = |
4803 | hub->ports[i - 1]->child; | |
65bdac5e | 4804 | |
5e467f6e | 4805 | dev_dbg(hub_dev, "warm reset port %d\n", i); |
481f2d4f JW |
4806 | if (!udev || !(portstatus & |
4807 | USB_PORT_STAT_CONNECTION)) { | |
d3b9d7a9 SS |
4808 | status = hub_port_reset(hub, i, |
4809 | NULL, HUB_BH_RESET_TIME, | |
4810 | true); | |
4811 | if (status < 0) | |
4812 | hub_port_disable(hub, i, 1); | |
4813 | } else { | |
4814 | usb_lock_device(udev); | |
4815 | status = usb_reset_device(udev); | |
4816 | usb_unlock_device(udev); | |
481f2d4f | 4817 | connect_change = 0; |
d3b9d7a9 | 4818 | } |
5e467f6e AX |
4819 | } |
4820 | ||
1da177e4 LT |
4821 | if (connect_change) |
4822 | hub_port_connect_change(hub, i, | |
4823 | portstatus, portchange); | |
4824 | } /* end for i */ | |
4825 | ||
4826 | /* deal with hub status changes */ | |
4827 | if (test_and_clear_bit(0, hub->event_bits) == 0) | |
4828 | ; /* do nothing */ | |
4829 | else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) | |
4830 | dev_err (hub_dev, "get_hub_status failed\n"); | |
4831 | else { | |
4832 | if (hubchange & HUB_CHANGE_LOCAL_POWER) { | |
4833 | dev_dbg (hub_dev, "power change\n"); | |
4834 | clear_hub_feature(hdev, C_HUB_LOCAL_POWER); | |
55c52718 AS |
4835 | if (hubstatus & HUB_STATUS_LOCAL_POWER) |
4836 | /* FIXME: Is this always true? */ | |
55c52718 | 4837 | hub->limited_power = 1; |
403fae78 | 4838 | else |
4839 | hub->limited_power = 0; | |
1da177e4 LT |
4840 | } |
4841 | if (hubchange & HUB_CHANGE_OVERCURRENT) { | |
752d57a8 PB |
4842 | u16 status = 0; |
4843 | u16 unused; | |
4844 | ||
4845 | dev_dbg(hub_dev, "over-current change\n"); | |
1da177e4 | 4846 | clear_hub_feature(hdev, C_HUB_OVER_CURRENT); |
752d57a8 | 4847 | msleep(500); /* Cool down */ |
8520f380 | 4848 | hub_power_on(hub, true); |
752d57a8 PB |
4849 | hub_hub_status(hub, &status, &unused); |
4850 | if (status & HUB_STATUS_OVERCURRENT) | |
4851 | dev_err(hub_dev, "over-current " | |
4852 | "condition\n"); | |
1da177e4 LT |
4853 | } |
4854 | } | |
4855 | ||
8e4ceb38 AS |
4856 | loop_autopm: |
4857 | /* Balance the usb_autopm_get_interface() above */ | |
4858 | usb_autopm_put_interface_no_suspend(intf); | |
4859 | loop: | |
4860 | /* Balance the usb_autopm_get_interface_no_resume() in | |
4861 | * kick_khubd() and allow autosuspend. | |
4862 | */ | |
4863 | usb_autopm_put_interface(intf); | |
9bbdf1e0 | 4864 | loop_disconnected: |
1da177e4 | 4865 | usb_unlock_device(hdev); |
e8054854 | 4866 | kref_put(&hub->kref, hub_release); |
1da177e4 LT |
4867 | |
4868 | } /* end while (1) */ | |
4869 | } | |
4870 | ||
4871 | static int hub_thread(void *__unused) | |
4872 | { | |
3bb1af52 AS |
4873 | /* khubd needs to be freezable to avoid intefering with USB-PERSIST |
4874 | * port handover. Otherwise it might see that a full-speed device | |
4875 | * was gone before the EHCI controller had handed its port over to | |
4876 | * the companion full-speed controller. | |
4877 | */ | |
83144186 | 4878 | set_freezable(); |
3bb1af52 | 4879 | |
1da177e4 LT |
4880 | do { |
4881 | hub_events(); | |
e42837bc | 4882 | wait_event_freezable(khubd_wait, |
9c8d6178 | 4883 | !list_empty(&hub_event_list) || |
4884 | kthread_should_stop()); | |
9c8d6178 | 4885 | } while (!kthread_should_stop() || !list_empty(&hub_event_list)); |
1da177e4 | 4886 | |
9c8d6178 | 4887 | pr_debug("%s: khubd exiting\n", usbcore_name); |
4888 | return 0; | |
1da177e4 LT |
4889 | } |
4890 | ||
1e927d96 | 4891 | static const struct usb_device_id hub_id_table[] = { |
e6f30dea ML |
4892 | { .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
4893 | | USB_DEVICE_ID_MATCH_INT_CLASS, | |
4894 | .idVendor = USB_VENDOR_GENESYS_LOGIC, | |
4895 | .bInterfaceClass = USB_CLASS_HUB, | |
4896 | .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND}, | |
1da177e4 LT |
4897 | { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, |
4898 | .bDeviceClass = USB_CLASS_HUB}, | |
4899 | { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, | |
4900 | .bInterfaceClass = USB_CLASS_HUB}, | |
4901 | { } /* Terminating entry */ | |
4902 | }; | |
4903 | ||
4904 | MODULE_DEVICE_TABLE (usb, hub_id_table); | |
4905 | ||
4906 | static struct usb_driver hub_driver = { | |
1da177e4 LT |
4907 | .name = "hub", |
4908 | .probe = hub_probe, | |
4909 | .disconnect = hub_disconnect, | |
4910 | .suspend = hub_suspend, | |
4911 | .resume = hub_resume, | |
f07600cf | 4912 | .reset_resume = hub_reset_resume, |
7de18d8b AS |
4913 | .pre_reset = hub_pre_reset, |
4914 | .post_reset = hub_post_reset, | |
c532b29a | 4915 | .unlocked_ioctl = hub_ioctl, |
1da177e4 | 4916 | .id_table = hub_id_table, |
40f122f3 | 4917 | .supports_autosuspend = 1, |
1da177e4 LT |
4918 | }; |
4919 | ||
4920 | int usb_hub_init(void) | |
4921 | { | |
1da177e4 LT |
4922 | if (usb_register(&hub_driver) < 0) { |
4923 | printk(KERN_ERR "%s: can't register hub driver\n", | |
4924 | usbcore_name); | |
4925 | return -1; | |
4926 | } | |
4927 | ||
9c8d6178 | 4928 | khubd_task = kthread_run(hub_thread, NULL, "khubd"); |
4929 | if (!IS_ERR(khubd_task)) | |
1da177e4 | 4930 | return 0; |
1da177e4 LT |
4931 | |
4932 | /* Fall through if kernel_thread failed */ | |
4933 | usb_deregister(&hub_driver); | |
4934 | printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); | |
4935 | ||
4936 | return -1; | |
4937 | } | |
4938 | ||
4939 | void usb_hub_cleanup(void) | |
4940 | { | |
9c8d6178 | 4941 | kthread_stop(khubd_task); |
1da177e4 LT |
4942 | |
4943 | /* | |
4944 | * Hub resources are freed for us by usb_deregister. It calls | |
4945 | * usb_driver_purge on every device which in turn calls that | |
4946 | * devices disconnect function if it is using this driver. | |
4947 | * The hub_disconnect function takes care of releasing the | |
4948 | * individual hub resources. -greg | |
4949 | */ | |
4950 | usb_deregister(&hub_driver); | |
4951 | } /* usb_hub_cleanup() */ | |
4952 | ||
eb764c4b AS |
4953 | static int descriptors_changed(struct usb_device *udev, |
4954 | struct usb_device_descriptor *old_device_descriptor) | |
4955 | { | |
4956 | int changed = 0; | |
4957 | unsigned index; | |
4958 | unsigned serial_len = 0; | |
4959 | unsigned len; | |
4960 | unsigned old_length; | |
4961 | int length; | |
4962 | char *buf; | |
4963 | ||
4964 | if (memcmp(&udev->descriptor, old_device_descriptor, | |
4965 | sizeof(*old_device_descriptor)) != 0) | |
4966 | return 1; | |
4967 | ||
4968 | /* Since the idVendor, idProduct, and bcdDevice values in the | |
4969 | * device descriptor haven't changed, we will assume the | |
4970 | * Manufacturer and Product strings haven't changed either. | |
4971 | * But the SerialNumber string could be different (e.g., a | |
4972 | * different flash card of the same brand). | |
4973 | */ | |
4974 | if (udev->serial) | |
4975 | serial_len = strlen(udev->serial) + 1; | |
1da177e4 | 4976 | |
eb764c4b | 4977 | len = serial_len; |
1da177e4 | 4978 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
eb764c4b AS |
4979 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
4980 | len = max(len, old_length); | |
1da177e4 | 4981 | } |
eb764c4b | 4982 | |
0cc1a51f | 4983 | buf = kmalloc(len, GFP_NOIO); |
1da177e4 LT |
4984 | if (buf == NULL) { |
4985 | dev_err(&udev->dev, "no mem to re-read configs after reset\n"); | |
4986 | /* assume the worst */ | |
4987 | return 1; | |
4988 | } | |
4989 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { | |
eb764c4b | 4990 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
1da177e4 LT |
4991 | length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, |
4992 | old_length); | |
eb764c4b | 4993 | if (length != old_length) { |
1da177e4 LT |
4994 | dev_dbg(&udev->dev, "config index %d, error %d\n", |
4995 | index, length); | |
eb764c4b | 4996 | changed = 1; |
1da177e4 LT |
4997 | break; |
4998 | } | |
4999 | if (memcmp (buf, udev->rawdescriptors[index], old_length) | |
5000 | != 0) { | |
5001 | dev_dbg(&udev->dev, "config index %d changed (#%d)\n", | |
eb764c4b AS |
5002 | index, |
5003 | ((struct usb_config_descriptor *) buf)-> | |
5004 | bConfigurationValue); | |
5005 | changed = 1; | |
1da177e4 LT |
5006 | break; |
5007 | } | |
5008 | } | |
eb764c4b AS |
5009 | |
5010 | if (!changed && serial_len) { | |
5011 | length = usb_string(udev, udev->descriptor.iSerialNumber, | |
5012 | buf, serial_len); | |
5013 | if (length + 1 != serial_len) { | |
5014 | dev_dbg(&udev->dev, "serial string error %d\n", | |
5015 | length); | |
5016 | changed = 1; | |
5017 | } else if (memcmp(buf, udev->serial, length) != 0) { | |
5018 | dev_dbg(&udev->dev, "serial string changed\n"); | |
5019 | changed = 1; | |
5020 | } | |
5021 | } | |
5022 | ||
1da177e4 | 5023 | kfree(buf); |
eb764c4b | 5024 | return changed; |
1da177e4 LT |
5025 | } |
5026 | ||
5027 | /** | |
742120c6 | 5028 | * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device |
1da177e4 LT |
5029 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
5030 | * | |
79efa097 AS |
5031 | * WARNING - don't use this routine to reset a composite device |
5032 | * (one with multiple interfaces owned by separate drivers)! | |
742120c6 | 5033 | * Use usb_reset_device() instead. |
1da177e4 LT |
5034 | * |
5035 | * Do a port reset, reassign the device's address, and establish its | |
5036 | * former operating configuration. If the reset fails, or the device's | |
5037 | * descriptors change from their values before the reset, or the original | |
5038 | * configuration and altsettings cannot be restored, a flag will be set | |
5039 | * telling khubd to pretend the device has been disconnected and then | |
5040 | * re-connected. All drivers will be unbound, and the device will be | |
5041 | * re-enumerated and probed all over again. | |
5042 | * | |
5043 | * Returns 0 if the reset succeeded, -ENODEV if the device has been | |
5044 | * flagged for logical disconnection, or some other negative error code | |
5045 | * if the reset wasn't even attempted. | |
5046 | * | |
5047 | * The caller must own the device lock. For example, it's safe to use | |
5048 | * this from a driver probe() routine after downloading new firmware. | |
5049 | * For calls that might not occur during probe(), drivers should lock | |
5050 | * the device using usb_lock_device_for_reset(). | |
6bc6cff5 AS |
5051 | * |
5052 | * Locking exception: This routine may also be called from within an | |
5053 | * autoresume handler. Such usage won't conflict with other tasks | |
5054 | * holding the device lock because these tasks should always call | |
5055 | * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. | |
1da177e4 | 5056 | */ |
742120c6 | 5057 | static int usb_reset_and_verify_device(struct usb_device *udev) |
1da177e4 LT |
5058 | { |
5059 | struct usb_device *parent_hdev = udev->parent; | |
5060 | struct usb_hub *parent_hub; | |
3f0479e0 | 5061 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 5062 | struct usb_device_descriptor descriptor = udev->descriptor; |
12c3da34 AS |
5063 | int i, ret = 0; |
5064 | int port1 = udev->portnum; | |
1da177e4 LT |
5065 | |
5066 | if (udev->state == USB_STATE_NOTATTACHED || | |
5067 | udev->state == USB_STATE_SUSPENDED) { | |
5068 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
5069 | udev->state); | |
5070 | return -EINVAL; | |
5071 | } | |
5072 | ||
5073 | if (!parent_hdev) { | |
4bec9917 | 5074 | /* this requires hcd-specific logic; see ohci_restart() */ |
441b62c1 | 5075 | dev_dbg(&udev->dev, "%s for root hub!\n", __func__); |
1da177e4 LT |
5076 | return -EISDIR; |
5077 | } | |
ad493e5e | 5078 | parent_hub = usb_hub_to_struct_hub(parent_hdev); |
1da177e4 | 5079 | |
f74631e3 SS |
5080 | /* Disable LPM and LTM while we reset the device and reinstall the alt |
5081 | * settings. Device-initiated LPM settings, and system exit latency | |
5082 | * settings are cleared when the device is reset, so we have to set | |
5083 | * them up again. | |
6d1d0513 SS |
5084 | */ |
5085 | ret = usb_unlocked_disable_lpm(udev); | |
5086 | if (ret) { | |
5087 | dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__); | |
5088 | goto re_enumerate; | |
5089 | } | |
f74631e3 SS |
5090 | ret = usb_disable_ltm(udev); |
5091 | if (ret) { | |
5092 | dev_err(&udev->dev, "%s Failed to disable LTM\n.", | |
5093 | __func__); | |
5094 | goto re_enumerate; | |
5095 | } | |
6d1d0513 | 5096 | |
1da177e4 LT |
5097 | set_bit(port1, parent_hub->busy_bits); |
5098 | for (i = 0; i < SET_CONFIG_TRIES; ++i) { | |
5099 | ||
5100 | /* ep0 maxpacket size may change; let the HCD know about it. | |
5101 | * Other endpoints will be handled by re-enumeration. */ | |
fc721f51 | 5102 | usb_ep0_reinit(udev); |
1da177e4 | 5103 | ret = hub_port_init(parent_hub, udev, port1, i); |
dd4dd19e | 5104 | if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) |
1da177e4 LT |
5105 | break; |
5106 | } | |
5107 | clear_bit(port1, parent_hub->busy_bits); | |
d5cbad4b | 5108 | |
1da177e4 LT |
5109 | if (ret < 0) |
5110 | goto re_enumerate; | |
5111 | ||
5112 | /* Device might have changed firmware (DFU or similar) */ | |
eb764c4b | 5113 | if (descriptors_changed(udev, &descriptor)) { |
1da177e4 LT |
5114 | dev_info(&udev->dev, "device firmware changed\n"); |
5115 | udev->descriptor = descriptor; /* for disconnect() calls */ | |
5116 | goto re_enumerate; | |
5117 | } | |
4fe0387a AS |
5118 | |
5119 | /* Restore the device's previous configuration */ | |
1da177e4 LT |
5120 | if (!udev->actconfig) |
5121 | goto done; | |
3f0479e0 | 5122 | |
d673bfcb | 5123 | mutex_lock(hcd->bandwidth_mutex); |
3f0479e0 SS |
5124 | ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); |
5125 | if (ret < 0) { | |
5126 | dev_warn(&udev->dev, | |
5127 | "Busted HC? Not enough HCD resources for " | |
5128 | "old configuration.\n"); | |
d673bfcb | 5129 | mutex_unlock(hcd->bandwidth_mutex); |
3f0479e0 SS |
5130 | goto re_enumerate; |
5131 | } | |
1da177e4 LT |
5132 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
5133 | USB_REQ_SET_CONFIGURATION, 0, | |
5134 | udev->actconfig->desc.bConfigurationValue, 0, | |
5135 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
5136 | if (ret < 0) { | |
5137 | dev_err(&udev->dev, | |
5138 | "can't restore configuration #%d (error=%d)\n", | |
5139 | udev->actconfig->desc.bConfigurationValue, ret); | |
d673bfcb | 5140 | mutex_unlock(hcd->bandwidth_mutex); |
1da177e4 LT |
5141 | goto re_enumerate; |
5142 | } | |
d673bfcb | 5143 | mutex_unlock(hcd->bandwidth_mutex); |
1da177e4 LT |
5144 | usb_set_device_state(udev, USB_STATE_CONFIGURED); |
5145 | ||
4fe0387a AS |
5146 | /* Put interfaces back into the same altsettings as before. |
5147 | * Don't bother to send the Set-Interface request for interfaces | |
5148 | * that were already in altsetting 0; besides being unnecessary, | |
5149 | * many devices can't handle it. Instead just reset the host-side | |
5150 | * endpoint state. | |
5151 | */ | |
1da177e4 | 5152 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
3f0479e0 SS |
5153 | struct usb_host_config *config = udev->actconfig; |
5154 | struct usb_interface *intf = config->interface[i]; | |
1da177e4 LT |
5155 | struct usb_interface_descriptor *desc; |
5156 | ||
1da177e4 | 5157 | desc = &intf->cur_altsetting->desc; |
4fe0387a AS |
5158 | if (desc->bAlternateSetting == 0) { |
5159 | usb_disable_interface(udev, intf, true); | |
5160 | usb_enable_interface(udev, intf, true); | |
5161 | ret = 0; | |
5162 | } else { | |
04a723ea SS |
5163 | /* Let the bandwidth allocation function know that this |
5164 | * device has been reset, and it will have to use | |
5165 | * alternate setting 0 as the current alternate setting. | |
3f0479e0 | 5166 | */ |
04a723ea | 5167 | intf->resetting_device = 1; |
4fe0387a AS |
5168 | ret = usb_set_interface(udev, desc->bInterfaceNumber, |
5169 | desc->bAlternateSetting); | |
04a723ea | 5170 | intf->resetting_device = 0; |
4fe0387a | 5171 | } |
1da177e4 LT |
5172 | if (ret < 0) { |
5173 | dev_err(&udev->dev, "failed to restore interface %d " | |
5174 | "altsetting %d (error=%d)\n", | |
5175 | desc->bInterfaceNumber, | |
5176 | desc->bAlternateSetting, | |
5177 | ret); | |
5178 | goto re_enumerate; | |
5179 | } | |
5180 | } | |
5181 | ||
5182 | done: | |
f74631e3 | 5183 | /* Now that the alt settings are re-installed, enable LTM and LPM. */ |
8306095f | 5184 | usb_unlocked_enable_lpm(udev); |
f74631e3 | 5185 | usb_enable_ltm(udev); |
1da177e4 LT |
5186 | return 0; |
5187 | ||
5188 | re_enumerate: | |
6d1d0513 | 5189 | /* LPM state doesn't matter when we're about to destroy the device. */ |
1da177e4 LT |
5190 | hub_port_logical_disconnect(parent_hub, port1); |
5191 | return -ENODEV; | |
5192 | } | |
79efa097 AS |
5193 | |
5194 | /** | |
742120c6 | 5195 | * usb_reset_device - warn interface drivers and perform a USB port reset |
79efa097 | 5196 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
79efa097 AS |
5197 | * |
5198 | * Warns all drivers bound to registered interfaces (using their pre_reset | |
5199 | * method), performs the port reset, and then lets the drivers know that | |
5200 | * the reset is over (using their post_reset method). | |
5201 | * | |
742120c6 | 5202 | * Return value is the same as for usb_reset_and_verify_device(). |
79efa097 AS |
5203 | * |
5204 | * The caller must own the device lock. For example, it's safe to use | |
5205 | * this from a driver probe() routine after downloading new firmware. | |
5206 | * For calls that might not occur during probe(), drivers should lock | |
5207 | * the device using usb_lock_device_for_reset(). | |
78d9a487 AS |
5208 | * |
5209 | * If an interface is currently being probed or disconnected, we assume | |
5210 | * its driver knows how to handle resets. For all other interfaces, | |
5211 | * if the driver doesn't have pre_reset and post_reset methods then | |
5212 | * we attempt to unbind it and rebind afterward. | |
79efa097 | 5213 | */ |
742120c6 | 5214 | int usb_reset_device(struct usb_device *udev) |
79efa097 AS |
5215 | { |
5216 | int ret; | |
852c4b43 | 5217 | int i; |
4d769def | 5218 | unsigned int noio_flag; |
79efa097 AS |
5219 | struct usb_host_config *config = udev->actconfig; |
5220 | ||
5221 | if (udev->state == USB_STATE_NOTATTACHED || | |
5222 | udev->state == USB_STATE_SUSPENDED) { | |
5223 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
5224 | udev->state); | |
5225 | return -EINVAL; | |
5226 | } | |
5227 | ||
4d769def ML |
5228 | /* |
5229 | * Don't allocate memory with GFP_KERNEL in current | |
5230 | * context to avoid possible deadlock if usb mass | |
5231 | * storage interface or usbnet interface(iSCSI case) | |
5232 | * is included in current configuration. The easist | |
5233 | * approach is to do it for every device reset, | |
5234 | * because the device 'memalloc_noio' flag may have | |
5235 | * not been set before reseting the usb device. | |
5236 | */ | |
5237 | noio_flag = memalloc_noio_save(); | |
5238 | ||
645daaab | 5239 | /* Prevent autosuspend during the reset */ |
94fcda1f | 5240 | usb_autoresume_device(udev); |
645daaab | 5241 | |
79efa097 | 5242 | if (config) { |
79efa097 | 5243 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { |
852c4b43 AS |
5244 | struct usb_interface *cintf = config->interface[i]; |
5245 | struct usb_driver *drv; | |
78d9a487 | 5246 | int unbind = 0; |
852c4b43 AS |
5247 | |
5248 | if (cintf->dev.driver) { | |
79efa097 | 5249 | drv = to_usb_driver(cintf->dev.driver); |
78d9a487 AS |
5250 | if (drv->pre_reset && drv->post_reset) |
5251 | unbind = (drv->pre_reset)(cintf); | |
5252 | else if (cintf->condition == | |
5253 | USB_INTERFACE_BOUND) | |
5254 | unbind = 1; | |
5255 | if (unbind) | |
5256 | usb_forced_unbind_intf(cintf); | |
79efa097 AS |
5257 | } |
5258 | } | |
5259 | } | |
5260 | ||
742120c6 | 5261 | ret = usb_reset_and_verify_device(udev); |
79efa097 AS |
5262 | |
5263 | if (config) { | |
79efa097 | 5264 | for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { |
852c4b43 AS |
5265 | struct usb_interface *cintf = config->interface[i]; |
5266 | struct usb_driver *drv; | |
78d9a487 | 5267 | int rebind = cintf->needs_binding; |
852c4b43 | 5268 | |
78d9a487 | 5269 | if (!rebind && cintf->dev.driver) { |
79efa097 AS |
5270 | drv = to_usb_driver(cintf->dev.driver); |
5271 | if (drv->post_reset) | |
78d9a487 AS |
5272 | rebind = (drv->post_reset)(cintf); |
5273 | else if (cintf->condition == | |
5274 | USB_INTERFACE_BOUND) | |
5275 | rebind = 1; | |
79efa097 | 5276 | } |
6c640945 | 5277 | if (ret == 0 && rebind) |
78d9a487 | 5278 | usb_rebind_intf(cintf); |
79efa097 AS |
5279 | } |
5280 | } | |
5281 | ||
94fcda1f | 5282 | usb_autosuspend_device(udev); |
4d769def | 5283 | memalloc_noio_restore(noio_flag); |
79efa097 AS |
5284 | return ret; |
5285 | } | |
742120c6 | 5286 | EXPORT_SYMBOL_GPL(usb_reset_device); |
dc023dce IPG |
5287 | |
5288 | ||
5289 | /** | |
5290 | * usb_queue_reset_device - Reset a USB device from an atomic context | |
5291 | * @iface: USB interface belonging to the device to reset | |
5292 | * | |
5293 | * This function can be used to reset a USB device from an atomic | |
5294 | * context, where usb_reset_device() won't work (as it blocks). | |
5295 | * | |
5296 | * Doing a reset via this method is functionally equivalent to calling | |
5297 | * usb_reset_device(), except for the fact that it is delayed to a | |
5298 | * workqueue. This means that any drivers bound to other interfaces | |
5299 | * might be unbound, as well as users from usbfs in user space. | |
5300 | * | |
5301 | * Corner cases: | |
5302 | * | |
5303 | * - Scheduling two resets at the same time from two different drivers | |
5304 | * attached to two different interfaces of the same device is | |
5305 | * possible; depending on how the driver attached to each interface | |
5306 | * handles ->pre_reset(), the second reset might happen or not. | |
5307 | * | |
5308 | * - If a driver is unbound and it had a pending reset, the reset will | |
5309 | * be cancelled. | |
5310 | * | |
5311 | * - This function can be called during .probe() or .disconnect() | |
5312 | * times. On return from .disconnect(), any pending resets will be | |
5313 | * cancelled. | |
5314 | * | |
5315 | * There is no no need to lock/unlock the @reset_ws as schedule_work() | |
5316 | * does its own. | |
5317 | * | |
5318 | * NOTE: We don't do any reference count tracking because it is not | |
5319 | * needed. The lifecycle of the work_struct is tied to the | |
5320 | * usb_interface. Before destroying the interface we cancel the | |
5321 | * work_struct, so the fact that work_struct is queued and or | |
5322 | * running means the interface (and thus, the device) exist and | |
5323 | * are referenced. | |
5324 | */ | |
5325 | void usb_queue_reset_device(struct usb_interface *iface) | |
5326 | { | |
5327 | schedule_work(&iface->reset_ws); | |
5328 | } | |
5329 | EXPORT_SYMBOL_GPL(usb_queue_reset_device); | |
ff823c79 LT |
5330 | |
5331 | /** | |
5332 | * usb_hub_find_child - Get the pointer of child device | |
5333 | * attached to the port which is specified by @port1. | |
5334 | * @hdev: USB device belonging to the usb hub | |
5335 | * @port1: port num to indicate which port the child device | |
5336 | * is attached to. | |
5337 | * | |
5338 | * USB drivers call this function to get hub's child device | |
5339 | * pointer. | |
5340 | * | |
5341 | * Return NULL if input param is invalid and | |
5342 | * child's usb_device pointer if non-NULL. | |
5343 | */ | |
5344 | struct usb_device *usb_hub_find_child(struct usb_device *hdev, | |
5345 | int port1) | |
5346 | { | |
ad493e5e | 5347 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
ff823c79 LT |
5348 | |
5349 | if (port1 < 1 || port1 > hdev->maxchild) | |
5350 | return NULL; | |
5351 | return hub->ports[port1 - 1]->child; | |
5352 | } | |
5353 | EXPORT_SYMBOL_GPL(usb_hub_find_child); | |
d5575424 | 5354 | |
05f91689 LT |
5355 | /** |
5356 | * usb_set_hub_port_connect_type - set hub port connect type. | |
5357 | * @hdev: USB device belonging to the usb hub | |
5358 | * @port1: port num of the port | |
5359 | * @type: connect type of the port | |
5360 | */ | |
5361 | void usb_set_hub_port_connect_type(struct usb_device *hdev, int port1, | |
5362 | enum usb_port_connect_type type) | |
5363 | { | |
ad493e5e | 5364 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
05f91689 | 5365 | |
41341261 MN |
5366 | if (hub) |
5367 | hub->ports[port1 - 1]->connect_type = type; | |
05f91689 LT |
5368 | } |
5369 | ||
5370 | /** | |
5371 | * usb_get_hub_port_connect_type - Get the port's connect type | |
5372 | * @hdev: USB device belonging to the usb hub | |
5373 | * @port1: port num of the port | |
5374 | * | |
5375 | * Return connect type of the port and if input params are | |
5376 | * invalid, return USB_PORT_CONNECT_TYPE_UNKNOWN. | |
5377 | */ | |
5378 | enum usb_port_connect_type | |
5379 | usb_get_hub_port_connect_type(struct usb_device *hdev, int port1) | |
5380 | { | |
ad493e5e | 5381 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
05f91689 | 5382 | |
41341261 MN |
5383 | if (!hub) |
5384 | return USB_PORT_CONNECT_TYPE_UNKNOWN; | |
5385 | ||
05f91689 LT |
5386 | return hub->ports[port1 - 1]->connect_type; |
5387 | } | |
5388 | ||
d2123fd9 LT |
5389 | void usb_hub_adjust_deviceremovable(struct usb_device *hdev, |
5390 | struct usb_hub_descriptor *desc) | |
5391 | { | |
5392 | enum usb_port_connect_type connect_type; | |
5393 | int i; | |
5394 | ||
5395 | if (!hub_is_superspeed(hdev)) { | |
5396 | for (i = 1; i <= hdev->maxchild; i++) { | |
5397 | connect_type = usb_get_hub_port_connect_type(hdev, i); | |
5398 | ||
5399 | if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { | |
5400 | u8 mask = 1 << (i%8); | |
5401 | ||
5402 | if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) { | |
5403 | dev_dbg(&hdev->dev, "usb port%d's DeviceRemovable is changed to 1 according to platform information.\n", | |
5404 | i); | |
5405 | desc->u.hs.DeviceRemovable[i/8] |= mask; | |
5406 | } | |
5407 | } | |
5408 | } | |
5409 | } else { | |
5410 | u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable); | |
5411 | ||
5412 | for (i = 1; i <= hdev->maxchild; i++) { | |
5413 | connect_type = usb_get_hub_port_connect_type(hdev, i); | |
5414 | ||
5415 | if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { | |
5416 | u16 mask = 1 << i; | |
5417 | ||
5418 | if (!(port_removable & mask)) { | |
5419 | dev_dbg(&hdev->dev, "usb port%d's DeviceRemovable is changed to 1 according to platform information.\n", | |
5420 | i); | |
5421 | port_removable |= mask; | |
5422 | } | |
5423 | } | |
5424 | } | |
5425 | ||
5426 | desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable); | |
5427 | } | |
5428 | } | |
5429 | ||
d5575424 LT |
5430 | #ifdef CONFIG_ACPI |
5431 | /** | |
5432 | * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle | |
5433 | * @hdev: USB device belonging to the usb hub | |
5434 | * @port1: port num of the port | |
5435 | * | |
5436 | * Return port's acpi handle if successful, NULL if params are | |
5437 | * invaild. | |
5438 | */ | |
5439 | acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev, | |
5440 | int port1) | |
5441 | { | |
ad493e5e | 5442 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
d5575424 | 5443 | |
41341261 MN |
5444 | if (!hub) |
5445 | return NULL; | |
5446 | ||
d5575424 LT |
5447 | return DEVICE_ACPI_HANDLE(&hub->ports[port1 - 1]->dev); |
5448 | } | |
5449 | #endif |