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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> |
93362a87 | 23 | #include <linux/usb/quirks.h> |
9c8d6178 | 24 | #include <linux/kthread.h> |
4186ecf8 | 25 | #include <linux/mutex.h> |
7dfb7103 | 26 | #include <linux/freezer.h> |
1da177e4 | 27 | |
1da177e4 LT |
28 | #include <asm/uaccess.h> |
29 | #include <asm/byteorder.h> | |
30 | ||
31 | #include "usb.h" | |
1da177e4 | 32 | |
f2a383e4 GKH |
33 | /* if we are in debug mode, always announce new devices */ |
34 | #ifdef DEBUG | |
35 | #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES | |
36 | #define CONFIG_USB_ANNOUNCE_NEW_DEVICES | |
37 | #endif | |
38 | #endif | |
39 | ||
1bb5f66b AS |
40 | struct usb_hub { |
41 | struct device *intfdev; /* the "interface" device */ | |
42 | struct usb_device *hdev; | |
e8054854 | 43 | struct kref kref; |
1bb5f66b AS |
44 | struct urb *urb; /* for interrupt polling pipe */ |
45 | ||
46 | /* buffer for urb ... with extra space in case of babble */ | |
47 | char (*buffer)[8]; | |
1bb5f66b AS |
48 | union { |
49 | struct usb_hub_status hub; | |
50 | struct usb_port_status port; | |
51 | } *status; /* buffer for status reports */ | |
db90e7a1 | 52 | struct mutex status_mutex; /* for the status buffer */ |
1bb5f66b AS |
53 | |
54 | int error; /* last reported error */ | |
55 | int nerrors; /* track consecutive errors */ | |
56 | ||
57 | struct list_head event_list; /* hubs w/data or errs ready */ | |
58 | unsigned long event_bits[1]; /* status change bitmask */ | |
59 | unsigned long change_bits[1]; /* ports with logical connect | |
60 | status change */ | |
61 | unsigned long busy_bits[1]; /* ports being reset or | |
62 | resumed */ | |
253e0572 AS |
63 | unsigned long removed_bits[1]; /* ports with a "removed" |
64 | device present */ | |
1bb5f66b AS |
65 | #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */ |
66 | #error event_bits[] is too short! | |
67 | #endif | |
68 | ||
69 | struct usb_hub_descriptor *descriptor; /* class descriptor */ | |
70 | struct usb_tt tt; /* Transaction Translator */ | |
71 | ||
72 | unsigned mA_per_port; /* current for each child */ | |
73 | ||
74 | unsigned limited_power:1; | |
75 | unsigned quiescing:1; | |
e8054854 | 76 | unsigned disconnected:1; |
1bb5f66b AS |
77 | |
78 | unsigned has_indicators:1; | |
79 | u8 indicator[USB_MAXCHILDREN]; | |
6d5aefb8 | 80 | struct delayed_work leds; |
8520f380 | 81 | struct delayed_work init_work; |
7cbe5dca | 82 | void **port_owners; |
1bb5f66b AS |
83 | }; |
84 | ||
dbe79bbe JY |
85 | static inline int hub_is_superspeed(struct usb_device *hdev) |
86 | { | |
87 | return (hdev->descriptor.bDeviceProtocol == 3); | |
88 | } | |
1bb5f66b | 89 | |
1da177e4 | 90 | /* Protect struct usb_device->state and ->children members |
9ad3d6cc | 91 | * Note: Both are also protected by ->dev.sem, except that ->state can |
1da177e4 LT |
92 | * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ |
93 | static DEFINE_SPINLOCK(device_state_lock); | |
94 | ||
95 | /* khubd's worklist and its lock */ | |
96 | static DEFINE_SPINLOCK(hub_event_lock); | |
97 | static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ | |
98 | ||
99 | /* Wakes up khubd */ | |
100 | static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); | |
101 | ||
9c8d6178 | 102 | static struct task_struct *khubd_task; |
1da177e4 LT |
103 | |
104 | /* cycle leds on hubs that aren't blinking for attention */ | |
105 | static int blinkenlights = 0; | |
106 | module_param (blinkenlights, bool, S_IRUGO); | |
107 | MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); | |
108 | ||
fd7c519d JK |
109 | /* |
110 | * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about | |
111 | * 10 seconds to send reply for the initial 64-byte descriptor request. | |
112 | */ | |
113 | /* define initial 64-byte descriptor request timeout in milliseconds */ | |
114 | static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; | |
115 | module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); | |
b9cef6c3 WF |
116 | MODULE_PARM_DESC(initial_descriptor_timeout, |
117 | "initial 64-byte descriptor request timeout in milliseconds " | |
118 | "(default 5000 - 5.0 seconds)"); | |
fd7c519d | 119 | |
1da177e4 LT |
120 | /* |
121 | * As of 2.6.10 we introduce a new USB device initialization scheme which | |
122 | * closely resembles the way Windows works. Hopefully it will be compatible | |
123 | * with a wider range of devices than the old scheme. However some previously | |
124 | * working devices may start giving rise to "device not accepting address" | |
125 | * errors; if that happens the user can try the old scheme by adjusting the | |
126 | * following module parameters. | |
127 | * | |
128 | * For maximum flexibility there are two boolean parameters to control the | |
129 | * hub driver's behavior. On the first initialization attempt, if the | |
130 | * "old_scheme_first" parameter is set then the old scheme will be used, | |
131 | * otherwise the new scheme is used. If that fails and "use_both_schemes" | |
132 | * is set, then the driver will make another attempt, using the other scheme. | |
133 | */ | |
134 | static int old_scheme_first = 0; | |
135 | module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); | |
136 | MODULE_PARM_DESC(old_scheme_first, | |
137 | "start with the old device initialization scheme"); | |
138 | ||
139 | static int use_both_schemes = 1; | |
140 | module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); | |
141 | MODULE_PARM_DESC(use_both_schemes, | |
142 | "try the other device initialization scheme if the " | |
143 | "first one fails"); | |
144 | ||
32fe0198 AS |
145 | /* Mutual exclusion for EHCI CF initialization. This interferes with |
146 | * port reset on some companion controllers. | |
147 | */ | |
148 | DECLARE_RWSEM(ehci_cf_port_reset_rwsem); | |
149 | EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); | |
150 | ||
948fea37 AS |
151 | #define HUB_DEBOUNCE_TIMEOUT 1500 |
152 | #define HUB_DEBOUNCE_STEP 25 | |
153 | #define HUB_DEBOUNCE_STABLE 100 | |
154 | ||
1da177e4 | 155 | |
742120c6 ML |
156 | static int usb_reset_and_verify_device(struct usb_device *udev); |
157 | ||
131dec34 | 158 | static inline char *portspeed(struct usb_hub *hub, int portstatus) |
1da177e4 | 159 | { |
131dec34 SS |
160 | if (hub_is_superspeed(hub->hdev)) |
161 | return "5.0 Gb/s"; | |
288ead45 | 162 | if (portstatus & USB_PORT_STAT_HIGH_SPEED) |
1da177e4 | 163 | return "480 Mb/s"; |
288ead45 | 164 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) |
1da177e4 LT |
165 | return "1.5 Mb/s"; |
166 | else | |
167 | return "12 Mb/s"; | |
168 | } | |
1da177e4 LT |
169 | |
170 | /* Note that hdev or one of its children must be locked! */ | |
25118084 | 171 | static struct usb_hub *hdev_to_hub(struct usb_device *hdev) |
1da177e4 | 172 | { |
25118084 AS |
173 | if (!hdev || !hdev->actconfig) |
174 | return NULL; | |
1da177e4 LT |
175 | return usb_get_intfdata(hdev->actconfig->interface[0]); |
176 | } | |
177 | ||
178 | /* USB 2.0 spec Section 11.24.4.5 */ | |
dbe79bbe | 179 | static int get_hub_descriptor(struct usb_device *hdev, void *data) |
1da177e4 | 180 | { |
dbe79bbe JY |
181 | int i, ret, size; |
182 | unsigned dtype; | |
183 | ||
184 | if (hub_is_superspeed(hdev)) { | |
185 | dtype = USB_DT_SS_HUB; | |
186 | size = USB_DT_SS_HUB_SIZE; | |
187 | } else { | |
188 | dtype = USB_DT_HUB; | |
189 | size = sizeof(struct usb_hub_descriptor); | |
190 | } | |
1da177e4 LT |
191 | |
192 | for (i = 0; i < 3; i++) { | |
193 | ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
194 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, | |
dbe79bbe | 195 | dtype << 8, 0, data, size, |
1da177e4 LT |
196 | USB_CTRL_GET_TIMEOUT); |
197 | if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) | |
198 | return ret; | |
199 | } | |
200 | return -EINVAL; | |
201 | } | |
202 | ||
203 | /* | |
204 | * USB 2.0 spec Section 11.24.2.1 | |
205 | */ | |
206 | static int clear_hub_feature(struct usb_device *hdev, int feature) | |
207 | { | |
208 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
209 | USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); | |
210 | } | |
211 | ||
212 | /* | |
213 | * USB 2.0 spec Section 11.24.2.2 | |
214 | */ | |
215 | static int clear_port_feature(struct usb_device *hdev, int port1, int feature) | |
216 | { | |
217 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
218 | USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, | |
219 | NULL, 0, 1000); | |
220 | } | |
221 | ||
222 | /* | |
223 | * USB 2.0 spec Section 11.24.2.13 | |
224 | */ | |
225 | static int set_port_feature(struct usb_device *hdev, int port1, int feature) | |
226 | { | |
227 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
228 | USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, | |
229 | NULL, 0, 1000); | |
230 | } | |
231 | ||
232 | /* | |
233 | * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 | |
234 | * for info about using port indicators | |
235 | */ | |
236 | static void set_port_led( | |
237 | struct usb_hub *hub, | |
238 | int port1, | |
239 | int selector | |
240 | ) | |
241 | { | |
242 | int status = set_port_feature(hub->hdev, (selector << 8) | port1, | |
243 | USB_PORT_FEAT_INDICATOR); | |
244 | if (status < 0) | |
245 | dev_dbg (hub->intfdev, | |
246 | "port %d indicator %s status %d\n", | |
247 | port1, | |
248 | ({ char *s; switch (selector) { | |
249 | case HUB_LED_AMBER: s = "amber"; break; | |
250 | case HUB_LED_GREEN: s = "green"; break; | |
251 | case HUB_LED_OFF: s = "off"; break; | |
252 | case HUB_LED_AUTO: s = "auto"; break; | |
253 | default: s = "??"; break; | |
254 | }; s; }), | |
255 | status); | |
256 | } | |
257 | ||
258 | #define LED_CYCLE_PERIOD ((2*HZ)/3) | |
259 | ||
c4028958 | 260 | static void led_work (struct work_struct *work) |
1da177e4 | 261 | { |
c4028958 DH |
262 | struct usb_hub *hub = |
263 | container_of(work, struct usb_hub, leds.work); | |
1da177e4 LT |
264 | struct usb_device *hdev = hub->hdev; |
265 | unsigned i; | |
266 | unsigned changed = 0; | |
267 | int cursor = -1; | |
268 | ||
269 | if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) | |
270 | return; | |
271 | ||
272 | for (i = 0; i < hub->descriptor->bNbrPorts; i++) { | |
273 | unsigned selector, mode; | |
274 | ||
275 | /* 30%-50% duty cycle */ | |
276 | ||
277 | switch (hub->indicator[i]) { | |
278 | /* cycle marker */ | |
279 | case INDICATOR_CYCLE: | |
280 | cursor = i; | |
281 | selector = HUB_LED_AUTO; | |
282 | mode = INDICATOR_AUTO; | |
283 | break; | |
284 | /* blinking green = sw attention */ | |
285 | case INDICATOR_GREEN_BLINK: | |
286 | selector = HUB_LED_GREEN; | |
287 | mode = INDICATOR_GREEN_BLINK_OFF; | |
288 | break; | |
289 | case INDICATOR_GREEN_BLINK_OFF: | |
290 | selector = HUB_LED_OFF; | |
291 | mode = INDICATOR_GREEN_BLINK; | |
292 | break; | |
293 | /* blinking amber = hw attention */ | |
294 | case INDICATOR_AMBER_BLINK: | |
295 | selector = HUB_LED_AMBER; | |
296 | mode = INDICATOR_AMBER_BLINK_OFF; | |
297 | break; | |
298 | case INDICATOR_AMBER_BLINK_OFF: | |
299 | selector = HUB_LED_OFF; | |
300 | mode = INDICATOR_AMBER_BLINK; | |
301 | break; | |
302 | /* blink green/amber = reserved */ | |
303 | case INDICATOR_ALT_BLINK: | |
304 | selector = HUB_LED_GREEN; | |
305 | mode = INDICATOR_ALT_BLINK_OFF; | |
306 | break; | |
307 | case INDICATOR_ALT_BLINK_OFF: | |
308 | selector = HUB_LED_AMBER; | |
309 | mode = INDICATOR_ALT_BLINK; | |
310 | break; | |
311 | default: | |
312 | continue; | |
313 | } | |
314 | if (selector != HUB_LED_AUTO) | |
315 | changed = 1; | |
316 | set_port_led(hub, i + 1, selector); | |
317 | hub->indicator[i] = mode; | |
318 | } | |
319 | if (!changed && blinkenlights) { | |
320 | cursor++; | |
321 | cursor %= hub->descriptor->bNbrPorts; | |
322 | set_port_led(hub, cursor + 1, HUB_LED_GREEN); | |
323 | hub->indicator[cursor] = INDICATOR_CYCLE; | |
324 | changed++; | |
325 | } | |
326 | if (changed) | |
327 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); | |
328 | } | |
329 | ||
330 | /* use a short timeout for hub/port status fetches */ | |
331 | #define USB_STS_TIMEOUT 1000 | |
332 | #define USB_STS_RETRIES 5 | |
333 | ||
334 | /* | |
335 | * USB 2.0 spec Section 11.24.2.6 | |
336 | */ | |
337 | static int get_hub_status(struct usb_device *hdev, | |
338 | struct usb_hub_status *data) | |
339 | { | |
340 | int i, status = -ETIMEDOUT; | |
341 | ||
3824c1dd LP |
342 | for (i = 0; i < USB_STS_RETRIES && |
343 | (status == -ETIMEDOUT || status == -EPIPE); i++) { | |
1da177e4 LT |
344 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
345 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, | |
346 | data, sizeof(*data), USB_STS_TIMEOUT); | |
347 | } | |
348 | return status; | |
349 | } | |
350 | ||
351 | /* | |
352 | * USB 2.0 spec Section 11.24.2.7 | |
353 | */ | |
354 | static int get_port_status(struct usb_device *hdev, int port1, | |
355 | struct usb_port_status *data) | |
356 | { | |
357 | int i, status = -ETIMEDOUT; | |
358 | ||
3824c1dd LP |
359 | for (i = 0; i < USB_STS_RETRIES && |
360 | (status == -ETIMEDOUT || status == -EPIPE); i++) { | |
1da177e4 LT |
361 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
362 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, | |
363 | data, sizeof(*data), USB_STS_TIMEOUT); | |
364 | } | |
365 | return status; | |
366 | } | |
367 | ||
3eb14915 AS |
368 | static int hub_port_status(struct usb_hub *hub, int port1, |
369 | u16 *status, u16 *change) | |
370 | { | |
371 | int ret; | |
372 | ||
373 | mutex_lock(&hub->status_mutex); | |
374 | ret = get_port_status(hub->hdev, port1, &hub->status->port); | |
375 | if (ret < 4) { | |
376 | dev_err(hub->intfdev, | |
377 | "%s failed (err = %d)\n", __func__, ret); | |
378 | if (ret >= 0) | |
379 | ret = -EIO; | |
380 | } else { | |
381 | *status = le16_to_cpu(hub->status->port.wPortStatus); | |
382 | *change = le16_to_cpu(hub->status->port.wPortChange); | |
dbe79bbe | 383 | |
3eb14915 AS |
384 | ret = 0; |
385 | } | |
386 | mutex_unlock(&hub->status_mutex); | |
387 | return ret; | |
388 | } | |
389 | ||
1da177e4 LT |
390 | static void kick_khubd(struct usb_hub *hub) |
391 | { | |
392 | unsigned long flags; | |
393 | ||
394 | spin_lock_irqsave(&hub_event_lock, flags); | |
2e2c5eea | 395 | if (!hub->disconnected && list_empty(&hub->event_list)) { |
1da177e4 | 396 | list_add_tail(&hub->event_list, &hub_event_list); |
8e4ceb38 AS |
397 | |
398 | /* Suppress autosuspend until khubd runs */ | |
399 | usb_autopm_get_interface_no_resume( | |
400 | to_usb_interface(hub->intfdev)); | |
1da177e4 LT |
401 | wake_up(&khubd_wait); |
402 | } | |
403 | spin_unlock_irqrestore(&hub_event_lock, flags); | |
404 | } | |
405 | ||
406 | void usb_kick_khubd(struct usb_device *hdev) | |
407 | { | |
25118084 AS |
408 | struct usb_hub *hub = hdev_to_hub(hdev); |
409 | ||
410 | if (hub) | |
411 | kick_khubd(hub); | |
1da177e4 LT |
412 | } |
413 | ||
414 | ||
415 | /* completion function, fires on port status changes and various faults */ | |
7d12e780 | 416 | static void hub_irq(struct urb *urb) |
1da177e4 | 417 | { |
ec17cf1c | 418 | struct usb_hub *hub = urb->context; |
e015268d | 419 | int status = urb->status; |
71d2718f | 420 | unsigned i; |
1da177e4 LT |
421 | unsigned long bits; |
422 | ||
e015268d | 423 | switch (status) { |
1da177e4 LT |
424 | case -ENOENT: /* synchronous unlink */ |
425 | case -ECONNRESET: /* async unlink */ | |
426 | case -ESHUTDOWN: /* hardware going away */ | |
427 | return; | |
428 | ||
429 | default: /* presumably an error */ | |
430 | /* Cause a hub reset after 10 consecutive errors */ | |
e015268d | 431 | dev_dbg (hub->intfdev, "transfer --> %d\n", status); |
1da177e4 LT |
432 | if ((++hub->nerrors < 10) || hub->error) |
433 | goto resubmit; | |
e015268d | 434 | hub->error = status; |
1da177e4 | 435 | /* FALL THROUGH */ |
ec17cf1c | 436 | |
1da177e4 LT |
437 | /* let khubd handle things */ |
438 | case 0: /* we got data: port status changed */ | |
439 | bits = 0; | |
440 | for (i = 0; i < urb->actual_length; ++i) | |
441 | bits |= ((unsigned long) ((*hub->buffer)[i])) | |
442 | << (i*8); | |
443 | hub->event_bits[0] = bits; | |
444 | break; | |
445 | } | |
446 | ||
447 | hub->nerrors = 0; | |
448 | ||
449 | /* Something happened, let khubd figure it out */ | |
450 | kick_khubd(hub); | |
451 | ||
452 | resubmit: | |
453 | if (hub->quiescing) | |
454 | return; | |
455 | ||
456 | if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 | |
457 | && status != -ENODEV && status != -EPERM) | |
458 | dev_err (hub->intfdev, "resubmit --> %d\n", status); | |
459 | } | |
460 | ||
461 | /* USB 2.0 spec Section 11.24.2.3 */ | |
462 | static inline int | |
463 | hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) | |
464 | { | |
c2f6595f | 465 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
1da177e4 LT |
466 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, |
467 | tt, NULL, 0, 1000); | |
468 | } | |
469 | ||
470 | /* | |
471 | * enumeration blocks khubd for a long time. we use keventd instead, since | |
472 | * long blocking there is the exception, not the rule. accordingly, HCDs | |
473 | * talking to TTs must queue control transfers (not just bulk and iso), so | |
474 | * both can talk to the same hub concurrently. | |
475 | */ | |
cb88a1b8 | 476 | static void hub_tt_work(struct work_struct *work) |
1da177e4 | 477 | { |
c4028958 | 478 | struct usb_hub *hub = |
cb88a1b8 | 479 | container_of(work, struct usb_hub, tt.clear_work); |
1da177e4 | 480 | unsigned long flags; |
55e5fdfa | 481 | int limit = 100; |
1da177e4 LT |
482 | |
483 | spin_lock_irqsave (&hub->tt.lock, flags); | |
55e5fdfa | 484 | while (--limit && !list_empty (&hub->tt.clear_list)) { |
d0f830d3 | 485 | struct list_head *next; |
1da177e4 LT |
486 | struct usb_tt_clear *clear; |
487 | struct usb_device *hdev = hub->hdev; | |
cb88a1b8 | 488 | const struct hc_driver *drv; |
1da177e4 LT |
489 | int status; |
490 | ||
d0f830d3 HS |
491 | next = hub->tt.clear_list.next; |
492 | clear = list_entry (next, struct usb_tt_clear, clear_list); | |
1da177e4 LT |
493 | list_del (&clear->clear_list); |
494 | ||
495 | /* drop lock so HCD can concurrently report other TT errors */ | |
496 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
497 | status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); | |
1da177e4 LT |
498 | if (status) |
499 | dev_err (&hdev->dev, | |
500 | "clear tt %d (%04x) error %d\n", | |
501 | clear->tt, clear->devinfo, status); | |
cb88a1b8 AS |
502 | |
503 | /* Tell the HCD, even if the operation failed */ | |
504 | drv = clear->hcd->driver; | |
505 | if (drv->clear_tt_buffer_complete) | |
506 | (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); | |
507 | ||
1bc3c9e1 | 508 | kfree(clear); |
cb88a1b8 | 509 | spin_lock_irqsave(&hub->tt.lock, flags); |
1da177e4 LT |
510 | } |
511 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
512 | } | |
513 | ||
514 | /** | |
cb88a1b8 AS |
515 | * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub |
516 | * @urb: an URB associated with the failed or incomplete split transaction | |
1da177e4 LT |
517 | * |
518 | * High speed HCDs use this to tell the hub driver that some split control or | |
519 | * bulk transaction failed in a way that requires clearing internal state of | |
520 | * a transaction translator. This is normally detected (and reported) from | |
521 | * interrupt context. | |
522 | * | |
523 | * It may not be possible for that hub to handle additional full (or low) | |
524 | * speed transactions until that state is fully cleared out. | |
525 | */ | |
cb88a1b8 | 526 | int usb_hub_clear_tt_buffer(struct urb *urb) |
1da177e4 | 527 | { |
cb88a1b8 AS |
528 | struct usb_device *udev = urb->dev; |
529 | int pipe = urb->pipe; | |
1da177e4 LT |
530 | struct usb_tt *tt = udev->tt; |
531 | unsigned long flags; | |
532 | struct usb_tt_clear *clear; | |
533 | ||
534 | /* we've got to cope with an arbitrary number of pending TT clears, | |
535 | * since each TT has "at least two" buffers that can need it (and | |
536 | * there can be many TTs per hub). even if they're uncommon. | |
537 | */ | |
54e6ecb2 | 538 | if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { |
1da177e4 LT |
539 | dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); |
540 | /* FIXME recover somehow ... RESET_TT? */ | |
cb88a1b8 | 541 | return -ENOMEM; |
1da177e4 LT |
542 | } |
543 | ||
544 | /* info that CLEAR_TT_BUFFER needs */ | |
545 | clear->tt = tt->multi ? udev->ttport : 1; | |
546 | clear->devinfo = usb_pipeendpoint (pipe); | |
547 | clear->devinfo |= udev->devnum << 4; | |
548 | clear->devinfo |= usb_pipecontrol (pipe) | |
549 | ? (USB_ENDPOINT_XFER_CONTROL << 11) | |
550 | : (USB_ENDPOINT_XFER_BULK << 11); | |
551 | if (usb_pipein (pipe)) | |
552 | clear->devinfo |= 1 << 15; | |
cb88a1b8 AS |
553 | |
554 | /* info for completion callback */ | |
555 | clear->hcd = bus_to_hcd(udev->bus); | |
556 | clear->ep = urb->ep; | |
557 | ||
1da177e4 LT |
558 | /* tell keventd to clear state for this TT */ |
559 | spin_lock_irqsave (&tt->lock, flags); | |
560 | list_add_tail (&clear->clear_list, &tt->clear_list); | |
cb88a1b8 | 561 | schedule_work(&tt->clear_work); |
1da177e4 | 562 | spin_unlock_irqrestore (&tt->lock, flags); |
cb88a1b8 | 563 | return 0; |
1da177e4 | 564 | } |
cb88a1b8 | 565 | EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); |
1da177e4 | 566 | |
8520f380 AS |
567 | /* If do_delay is false, return the number of milliseconds the caller |
568 | * needs to delay. | |
569 | */ | |
570 | static unsigned hub_power_on(struct usb_hub *hub, bool do_delay) | |
1da177e4 LT |
571 | { |
572 | int port1; | |
b789696a | 573 | unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; |
8520f380 | 574 | unsigned delay; |
4489a571 AS |
575 | u16 wHubCharacteristics = |
576 | le16_to_cpu(hub->descriptor->wHubCharacteristics); | |
577 | ||
578 | /* Enable power on each port. Some hubs have reserved values | |
579 | * of LPSM (> 2) in their descriptors, even though they are | |
580 | * USB 2.0 hubs. Some hubs do not implement port-power switching | |
581 | * but only emulate it. In all cases, the ports won't work | |
582 | * unless we send these messages to the hub. | |
583 | */ | |
584 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) | |
1da177e4 | 585 | dev_dbg(hub->intfdev, "enabling power on all ports\n"); |
4489a571 AS |
586 | else |
587 | dev_dbg(hub->intfdev, "trying to enable port power on " | |
588 | "non-switchable hub\n"); | |
589 | for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) | |
590 | set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); | |
1da177e4 | 591 | |
b789696a | 592 | /* Wait at least 100 msec for power to become stable */ |
8520f380 AS |
593 | delay = max(pgood_delay, (unsigned) 100); |
594 | if (do_delay) | |
595 | msleep(delay); | |
596 | return delay; | |
1da177e4 LT |
597 | } |
598 | ||
1da177e4 LT |
599 | static int hub_hub_status(struct usb_hub *hub, |
600 | u16 *status, u16 *change) | |
601 | { | |
602 | int ret; | |
603 | ||
db90e7a1 | 604 | mutex_lock(&hub->status_mutex); |
1da177e4 LT |
605 | ret = get_hub_status(hub->hdev, &hub->status->hub); |
606 | if (ret < 0) | |
607 | dev_err (hub->intfdev, | |
441b62c1 | 608 | "%s failed (err = %d)\n", __func__, ret); |
1da177e4 LT |
609 | else { |
610 | *status = le16_to_cpu(hub->status->hub.wHubStatus); | |
611 | *change = le16_to_cpu(hub->status->hub.wHubChange); | |
612 | ret = 0; | |
613 | } | |
db90e7a1 | 614 | mutex_unlock(&hub->status_mutex); |
1da177e4 LT |
615 | return ret; |
616 | } | |
617 | ||
8b28c752 AS |
618 | static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) |
619 | { | |
620 | struct usb_device *hdev = hub->hdev; | |
0458d5b4 | 621 | int ret = 0; |
8b28c752 | 622 | |
0458d5b4 | 623 | if (hdev->children[port1-1] && set_state) |
8b28c752 AS |
624 | usb_set_device_state(hdev->children[port1-1], |
625 | USB_STATE_NOTATTACHED); | |
dbe79bbe | 626 | if (!hub->error && !hub_is_superspeed(hub->hdev)) |
0458d5b4 | 627 | ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); |
8b28c752 AS |
628 | if (ret) |
629 | dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", | |
0458d5b4 | 630 | port1, ret); |
8b28c752 AS |
631 | return ret; |
632 | } | |
633 | ||
0458d5b4 | 634 | /* |
6d42fcdb | 635 | * Disable a port and mark a logical connect-change event, so that some |
0458d5b4 AS |
636 | * time later khubd will disconnect() any existing usb_device on the port |
637 | * and will re-enumerate if there actually is a device attached. | |
638 | */ | |
639 | static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) | |
640 | { | |
641 | dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); | |
642 | hub_port_disable(hub, port1, 1); | |
7d069b7d | 643 | |
0458d5b4 AS |
644 | /* FIXME let caller ask to power down the port: |
645 | * - some devices won't enumerate without a VBUS power cycle | |
646 | * - SRP saves power that way | |
647 | * - ... new call, TBD ... | |
648 | * That's easy if this hub can switch power per-port, and | |
649 | * khubd reactivates the port later (timer, SRP, etc). | |
650 | * Powerdown must be optional, because of reset/DFU. | |
651 | */ | |
652 | ||
653 | set_bit(port1, hub->change_bits); | |
654 | kick_khubd(hub); | |
655 | } | |
656 | ||
253e0572 AS |
657 | /** |
658 | * usb_remove_device - disable a device's port on its parent hub | |
659 | * @udev: device to be disabled and removed | |
660 | * Context: @udev locked, must be able to sleep. | |
661 | * | |
662 | * After @udev's port has been disabled, khubd is notified and it will | |
663 | * see that the device has been disconnected. When the device is | |
664 | * physically unplugged and something is plugged in, the events will | |
665 | * be received and processed normally. | |
666 | */ | |
667 | int usb_remove_device(struct usb_device *udev) | |
668 | { | |
669 | struct usb_hub *hub; | |
670 | struct usb_interface *intf; | |
671 | ||
672 | if (!udev->parent) /* Can't remove a root hub */ | |
673 | return -EINVAL; | |
674 | hub = hdev_to_hub(udev->parent); | |
675 | intf = to_usb_interface(hub->intfdev); | |
676 | ||
677 | usb_autopm_get_interface(intf); | |
678 | set_bit(udev->portnum, hub->removed_bits); | |
679 | hub_port_logical_disconnect(hub, udev->portnum); | |
680 | usb_autopm_put_interface(intf); | |
681 | return 0; | |
682 | } | |
683 | ||
6ee0b270 | 684 | enum hub_activation_type { |
8e4ceb38 | 685 | HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ |
8520f380 | 686 | HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, |
6ee0b270 | 687 | }; |
5e6effae | 688 | |
8520f380 AS |
689 | static void hub_init_func2(struct work_struct *ws); |
690 | static void hub_init_func3(struct work_struct *ws); | |
691 | ||
f2835219 | 692 | static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) |
5e6effae AS |
693 | { |
694 | struct usb_device *hdev = hub->hdev; | |
653a39d1 SS |
695 | struct usb_hcd *hcd; |
696 | int ret; | |
5e6effae | 697 | int port1; |
f2835219 | 698 | int status; |
948fea37 | 699 | bool need_debounce_delay = false; |
8520f380 AS |
700 | unsigned delay; |
701 | ||
702 | /* Continue a partial initialization */ | |
703 | if (type == HUB_INIT2) | |
704 | goto init2; | |
705 | if (type == HUB_INIT3) | |
706 | goto init3; | |
5e6effae | 707 | |
f2835219 AS |
708 | /* After a resume, port power should still be on. |
709 | * For any other type of activation, turn it on. | |
710 | */ | |
8520f380 AS |
711 | if (type != HUB_RESUME) { |
712 | ||
713 | /* Speed up system boot by using a delayed_work for the | |
714 | * hub's initial power-up delays. This is pretty awkward | |
715 | * and the implementation looks like a home-brewed sort of | |
716 | * setjmp/longjmp, but it saves at least 100 ms for each | |
717 | * root hub (assuming usbcore is compiled into the kernel | |
718 | * rather than as a module). It adds up. | |
719 | * | |
720 | * This can't be done for HUB_RESUME or HUB_RESET_RESUME | |
721 | * because for those activation types the ports have to be | |
722 | * operational when we return. In theory this could be done | |
723 | * for HUB_POST_RESET, but it's easier not to. | |
724 | */ | |
725 | if (type == HUB_INIT) { | |
726 | delay = hub_power_on(hub, false); | |
727 | PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2); | |
728 | schedule_delayed_work(&hub->init_work, | |
729 | msecs_to_jiffies(delay)); | |
61fbeba1 AS |
730 | |
731 | /* Suppress autosuspend until init is done */ | |
8e4ceb38 AS |
732 | usb_autopm_get_interface_no_resume( |
733 | to_usb_interface(hub->intfdev)); | |
8520f380 | 734 | return; /* Continues at init2: below */ |
653a39d1 SS |
735 | } else if (type == HUB_RESET_RESUME) { |
736 | /* The internal host controller state for the hub device | |
737 | * may be gone after a host power loss on system resume. | |
738 | * Update the device's info so the HW knows it's a hub. | |
739 | */ | |
740 | hcd = bus_to_hcd(hdev->bus); | |
741 | if (hcd->driver->update_hub_device) { | |
742 | ret = hcd->driver->update_hub_device(hcd, hdev, | |
743 | &hub->tt, GFP_NOIO); | |
744 | if (ret < 0) { | |
745 | dev_err(hub->intfdev, "Host not " | |
746 | "accepting hub info " | |
747 | "update.\n"); | |
748 | dev_err(hub->intfdev, "LS/FS devices " | |
749 | "and hubs may not work " | |
750 | "under this hub\n."); | |
751 | } | |
752 | } | |
753 | hub_power_on(hub, true); | |
8520f380 AS |
754 | } else { |
755 | hub_power_on(hub, true); | |
756 | } | |
757 | } | |
758 | init2: | |
f2835219 | 759 | |
6ee0b270 AS |
760 | /* Check each port and set hub->change_bits to let khubd know |
761 | * which ports need attention. | |
5e6effae AS |
762 | */ |
763 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
764 | struct usb_device *udev = hdev->children[port1-1]; | |
5e6effae AS |
765 | u16 portstatus, portchange; |
766 | ||
6ee0b270 AS |
767 | portstatus = portchange = 0; |
768 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
769 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) | |
770 | dev_dbg(hub->intfdev, | |
771 | "port %d: status %04x change %04x\n", | |
772 | port1, portstatus, portchange); | |
773 | ||
774 | /* After anything other than HUB_RESUME (i.e., initialization | |
775 | * or any sort of reset), every port should be disabled. | |
776 | * Unconnected ports should likewise be disabled (paranoia), | |
777 | * and so should ports for which we have no usb_device. | |
778 | */ | |
779 | if ((portstatus & USB_PORT_STAT_ENABLE) && ( | |
780 | type != HUB_RESUME || | |
781 | !(portstatus & USB_PORT_STAT_CONNECTION) || | |
782 | !udev || | |
783 | udev->state == USB_STATE_NOTATTACHED)) { | |
9f0a6cd3 AX |
784 | /* |
785 | * USB3 protocol ports will automatically transition | |
786 | * to Enabled state when detect an USB3.0 device attach. | |
787 | * Do not disable USB3 protocol ports. | |
9f0a6cd3 | 788 | */ |
131dec34 | 789 | if (!hub_is_superspeed(hdev)) { |
9f0a6cd3 AX |
790 | clear_port_feature(hdev, port1, |
791 | USB_PORT_FEAT_ENABLE); | |
792 | portstatus &= ~USB_PORT_STAT_ENABLE; | |
85f0ff46 SS |
793 | } else { |
794 | /* Pretend that power was lost for USB3 devs */ | |
795 | portstatus &= ~USB_PORT_STAT_ENABLE; | |
9f0a6cd3 | 796 | } |
5e6effae AS |
797 | } |
798 | ||
948fea37 AS |
799 | /* Clear status-change flags; we'll debounce later */ |
800 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
801 | need_debounce_delay = true; | |
802 | clear_port_feature(hub->hdev, port1, | |
803 | USB_PORT_FEAT_C_CONNECTION); | |
804 | } | |
805 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
806 | need_debounce_delay = true; | |
807 | clear_port_feature(hub->hdev, port1, | |
808 | USB_PORT_FEAT_C_ENABLE); | |
809 | } | |
dbe79bbe JY |
810 | if (portchange & USB_PORT_STAT_C_LINK_STATE) { |
811 | need_debounce_delay = true; | |
812 | clear_port_feature(hub->hdev, port1, | |
813 | USB_PORT_FEAT_C_PORT_LINK_STATE); | |
814 | } | |
948fea37 | 815 | |
253e0572 AS |
816 | /* We can forget about a "removed" device when there's a |
817 | * physical disconnect or the connect status changes. | |
818 | */ | |
819 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
820 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
821 | clear_bit(port1, hub->removed_bits); | |
822 | ||
6ee0b270 AS |
823 | if (!udev || udev->state == USB_STATE_NOTATTACHED) { |
824 | /* Tell khubd to disconnect the device or | |
825 | * check for a new connection | |
826 | */ | |
827 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) | |
828 | set_bit(port1, hub->change_bits); | |
829 | ||
830 | } else if (portstatus & USB_PORT_STAT_ENABLE) { | |
831 | /* The power session apparently survived the resume. | |
832 | * If there was an overcurrent or suspend change | |
833 | * (i.e., remote wakeup request), have khubd | |
834 | * take care of it. | |
835 | */ | |
836 | if (portchange) | |
837 | set_bit(port1, hub->change_bits); | |
5e6effae | 838 | |
6ee0b270 | 839 | } else if (udev->persist_enabled) { |
6ee0b270 | 840 | #ifdef CONFIG_PM |
5e6effae | 841 | udev->reset_resume = 1; |
6ee0b270 | 842 | #endif |
8808f00c AS |
843 | set_bit(port1, hub->change_bits); |
844 | ||
6ee0b270 AS |
845 | } else { |
846 | /* The power session is gone; tell khubd */ | |
847 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
848 | set_bit(port1, hub->change_bits); | |
5e6effae | 849 | } |
5e6effae AS |
850 | } |
851 | ||
948fea37 AS |
852 | /* If no port-status-change flags were set, we don't need any |
853 | * debouncing. If flags were set we can try to debounce the | |
854 | * ports all at once right now, instead of letting khubd do them | |
855 | * one at a time later on. | |
856 | * | |
857 | * If any port-status changes do occur during this delay, khubd | |
858 | * will see them later and handle them normally. | |
859 | */ | |
8520f380 AS |
860 | if (need_debounce_delay) { |
861 | delay = HUB_DEBOUNCE_STABLE; | |
862 | ||
863 | /* Don't do a long sleep inside a workqueue routine */ | |
864 | if (type == HUB_INIT2) { | |
865 | PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3); | |
866 | schedule_delayed_work(&hub->init_work, | |
867 | msecs_to_jiffies(delay)); | |
868 | return; /* Continues at init3: below */ | |
869 | } else { | |
870 | msleep(delay); | |
871 | } | |
872 | } | |
873 | init3: | |
f2835219 AS |
874 | hub->quiescing = 0; |
875 | ||
876 | status = usb_submit_urb(hub->urb, GFP_NOIO); | |
877 | if (status < 0) | |
878 | dev_err(hub->intfdev, "activate --> %d\n", status); | |
879 | if (hub->has_indicators && blinkenlights) | |
880 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); | |
881 | ||
882 | /* Scan all ports that need attention */ | |
883 | kick_khubd(hub); | |
8e4ceb38 AS |
884 | |
885 | /* Allow autosuspend if it was suppressed */ | |
886 | if (type <= HUB_INIT3) | |
887 | usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); | |
5e6effae AS |
888 | } |
889 | ||
8520f380 AS |
890 | /* Implement the continuations for the delays above */ |
891 | static void hub_init_func2(struct work_struct *ws) | |
892 | { | |
893 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
894 | ||
895 | hub_activate(hub, HUB_INIT2); | |
896 | } | |
897 | ||
898 | static void hub_init_func3(struct work_struct *ws) | |
899 | { | |
900 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
901 | ||
902 | hub_activate(hub, HUB_INIT3); | |
903 | } | |
904 | ||
4330354f AS |
905 | enum hub_quiescing_type { |
906 | HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND | |
907 | }; | |
908 | ||
909 | static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) | |
910 | { | |
911 | struct usb_device *hdev = hub->hdev; | |
912 | int i; | |
913 | ||
8520f380 AS |
914 | cancel_delayed_work_sync(&hub->init_work); |
915 | ||
4330354f AS |
916 | /* khubd and related activity won't re-trigger */ |
917 | hub->quiescing = 1; | |
918 | ||
919 | if (type != HUB_SUSPEND) { | |
920 | /* Disconnect all the children */ | |
921 | for (i = 0; i < hdev->maxchild; ++i) { | |
922 | if (hdev->children[i]) | |
923 | usb_disconnect(&hdev->children[i]); | |
924 | } | |
925 | } | |
926 | ||
927 | /* Stop khubd and related activity */ | |
928 | usb_kill_urb(hub->urb); | |
929 | if (hub->has_indicators) | |
930 | cancel_delayed_work_sync(&hub->leds); | |
931 | if (hub->tt.hub) | |
cb88a1b8 | 932 | cancel_work_sync(&hub->tt.clear_work); |
4330354f AS |
933 | } |
934 | ||
3eb14915 AS |
935 | /* caller has locked the hub device */ |
936 | static int hub_pre_reset(struct usb_interface *intf) | |
937 | { | |
938 | struct usb_hub *hub = usb_get_intfdata(intf); | |
939 | ||
4330354f | 940 | hub_quiesce(hub, HUB_PRE_RESET); |
f07600cf | 941 | return 0; |
7d069b7d AS |
942 | } |
943 | ||
944 | /* caller has locked the hub device */ | |
f07600cf | 945 | static int hub_post_reset(struct usb_interface *intf) |
7d069b7d | 946 | { |
7de18d8b AS |
947 | struct usb_hub *hub = usb_get_intfdata(intf); |
948 | ||
f2835219 | 949 | hub_activate(hub, HUB_POST_RESET); |
f07600cf | 950 | return 0; |
7d069b7d AS |
951 | } |
952 | ||
1da177e4 LT |
953 | static int hub_configure(struct usb_hub *hub, |
954 | struct usb_endpoint_descriptor *endpoint) | |
955 | { | |
b356b7c7 | 956 | struct usb_hcd *hcd; |
1da177e4 LT |
957 | struct usb_device *hdev = hub->hdev; |
958 | struct device *hub_dev = hub->intfdev; | |
959 | u16 hubstatus, hubchange; | |
74ad9bd2 | 960 | u16 wHubCharacteristics; |
1da177e4 LT |
961 | unsigned int pipe; |
962 | int maxp, ret; | |
7cbe5dca | 963 | char *message = "out of memory"; |
1da177e4 | 964 | |
d697cdda | 965 | hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); |
1da177e4 | 966 | if (!hub->buffer) { |
1da177e4 LT |
967 | ret = -ENOMEM; |
968 | goto fail; | |
969 | } | |
970 | ||
971 | hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); | |
972 | if (!hub->status) { | |
1da177e4 LT |
973 | ret = -ENOMEM; |
974 | goto fail; | |
975 | } | |
db90e7a1 | 976 | mutex_init(&hub->status_mutex); |
1da177e4 LT |
977 | |
978 | hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); | |
979 | if (!hub->descriptor) { | |
1da177e4 LT |
980 | ret = -ENOMEM; |
981 | goto fail; | |
982 | } | |
983 | ||
dbe79bbe JY |
984 | if (hub_is_superspeed(hdev) && (hdev->parent != NULL)) { |
985 | ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
986 | HUB_SET_DEPTH, USB_RT_HUB, | |
987 | hdev->level - 1, 0, NULL, 0, | |
988 | USB_CTRL_SET_TIMEOUT); | |
989 | ||
990 | if (ret < 0) { | |
991 | message = "can't set hub depth"; | |
992 | goto fail; | |
993 | } | |
994 | } | |
995 | ||
1da177e4 LT |
996 | /* Request the entire hub descriptor. |
997 | * hub->descriptor can handle USB_MAXCHILDREN ports, | |
998 | * but the hub can/will return fewer bytes here. | |
999 | */ | |
dbe79bbe | 1000 | ret = get_hub_descriptor(hdev, hub->descriptor); |
1da177e4 LT |
1001 | if (ret < 0) { |
1002 | message = "can't read hub descriptor"; | |
1003 | goto fail; | |
1004 | } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { | |
1005 | message = "hub has too many ports!"; | |
1006 | ret = -ENODEV; | |
1007 | goto fail; | |
1008 | } | |
1009 | ||
1010 | hdev->maxchild = hub->descriptor->bNbrPorts; | |
1011 | dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, | |
1012 | (hdev->maxchild == 1) ? "" : "s"); | |
1013 | ||
7cbe5dca AS |
1014 | hub->port_owners = kzalloc(hdev->maxchild * sizeof(void *), GFP_KERNEL); |
1015 | if (!hub->port_owners) { | |
1016 | ret = -ENOMEM; | |
1017 | goto fail; | |
1018 | } | |
1019 | ||
74ad9bd2 | 1020 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
1da177e4 | 1021 | |
dbe79bbe JY |
1022 | /* FIXME for USB 3.0, skip for now */ |
1023 | if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && | |
1024 | !(hub_is_superspeed(hdev))) { | |
1da177e4 LT |
1025 | int i; |
1026 | char portstr [USB_MAXCHILDREN + 1]; | |
1027 | ||
1028 | for (i = 0; i < hdev->maxchild; i++) | |
dbe79bbe | 1029 | portstr[i] = hub->descriptor->u.hs.DeviceRemovable |
1da177e4 LT |
1030 | [((i + 1) / 8)] & (1 << ((i + 1) % 8)) |
1031 | ? 'F' : 'R'; | |
1032 | portstr[hdev->maxchild] = 0; | |
1033 | dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); | |
1034 | } else | |
1035 | dev_dbg(hub_dev, "standalone hub\n"); | |
1036 | ||
74ad9bd2 | 1037 | switch (wHubCharacteristics & HUB_CHAR_LPSM) { |
1da177e4 LT |
1038 | case 0x00: |
1039 | dev_dbg(hub_dev, "ganged power switching\n"); | |
1040 | break; | |
1041 | case 0x01: | |
1042 | dev_dbg(hub_dev, "individual port power switching\n"); | |
1043 | break; | |
1044 | case 0x02: | |
1045 | case 0x03: | |
1046 | dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); | |
1047 | break; | |
1048 | } | |
1049 | ||
74ad9bd2 | 1050 | switch (wHubCharacteristics & HUB_CHAR_OCPM) { |
1da177e4 LT |
1051 | case 0x00: |
1052 | dev_dbg(hub_dev, "global over-current protection\n"); | |
1053 | break; | |
1054 | case 0x08: | |
1055 | dev_dbg(hub_dev, "individual port over-current protection\n"); | |
1056 | break; | |
1057 | case 0x10: | |
1058 | case 0x18: | |
1059 | dev_dbg(hub_dev, "no over-current protection\n"); | |
1060 | break; | |
1061 | } | |
1062 | ||
1063 | spin_lock_init (&hub->tt.lock); | |
1064 | INIT_LIST_HEAD (&hub->tt.clear_list); | |
cb88a1b8 | 1065 | INIT_WORK(&hub->tt.clear_work, hub_tt_work); |
1da177e4 LT |
1066 | switch (hdev->descriptor.bDeviceProtocol) { |
1067 | case 0: | |
1068 | break; | |
1069 | case 1: | |
1070 | dev_dbg(hub_dev, "Single TT\n"); | |
1071 | hub->tt.hub = hdev; | |
1072 | break; | |
1073 | case 2: | |
1074 | ret = usb_set_interface(hdev, 0, 1); | |
1075 | if (ret == 0) { | |
1076 | dev_dbg(hub_dev, "TT per port\n"); | |
1077 | hub->tt.multi = 1; | |
1078 | } else | |
1079 | dev_err(hub_dev, "Using single TT (err %d)\n", | |
1080 | ret); | |
1081 | hub->tt.hub = hdev; | |
1082 | break; | |
d2e9b4d6 SS |
1083 | case 3: |
1084 | /* USB 3.0 hubs don't have a TT */ | |
1085 | break; | |
1da177e4 LT |
1086 | default: |
1087 | dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", | |
1088 | hdev->descriptor.bDeviceProtocol); | |
1089 | break; | |
1090 | } | |
1091 | ||
e09711ae | 1092 | /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ |
74ad9bd2 | 1093 | switch (wHubCharacteristics & HUB_CHAR_TTTT) { |
e09711ae DB |
1094 | case HUB_TTTT_8_BITS: |
1095 | if (hdev->descriptor.bDeviceProtocol != 0) { | |
1096 | hub->tt.think_time = 666; | |
1097 | dev_dbg(hub_dev, "TT requires at most %d " | |
1098 | "FS bit times (%d ns)\n", | |
1099 | 8, hub->tt.think_time); | |
1100 | } | |
1da177e4 | 1101 | break; |
e09711ae DB |
1102 | case HUB_TTTT_16_BITS: |
1103 | hub->tt.think_time = 666 * 2; | |
1104 | dev_dbg(hub_dev, "TT requires at most %d " | |
1105 | "FS bit times (%d ns)\n", | |
1106 | 16, hub->tt.think_time); | |
1da177e4 | 1107 | break; |
e09711ae DB |
1108 | case HUB_TTTT_24_BITS: |
1109 | hub->tt.think_time = 666 * 3; | |
1110 | dev_dbg(hub_dev, "TT requires at most %d " | |
1111 | "FS bit times (%d ns)\n", | |
1112 | 24, hub->tt.think_time); | |
1da177e4 | 1113 | break; |
e09711ae DB |
1114 | case HUB_TTTT_32_BITS: |
1115 | hub->tt.think_time = 666 * 4; | |
1116 | dev_dbg(hub_dev, "TT requires at most %d " | |
1117 | "FS bit times (%d ns)\n", | |
1118 | 32, hub->tt.think_time); | |
1da177e4 LT |
1119 | break; |
1120 | } | |
1121 | ||
1122 | /* probe() zeroes hub->indicator[] */ | |
74ad9bd2 | 1123 | if (wHubCharacteristics & HUB_CHAR_PORTIND) { |
1da177e4 LT |
1124 | hub->has_indicators = 1; |
1125 | dev_dbg(hub_dev, "Port indicators are supported\n"); | |
1126 | } | |
1127 | ||
1128 | dev_dbg(hub_dev, "power on to power good time: %dms\n", | |
1129 | hub->descriptor->bPwrOn2PwrGood * 2); | |
1130 | ||
1131 | /* power budgeting mostly matters with bus-powered hubs, | |
1132 | * and battery-powered root hubs (may provide just 8 mA). | |
1133 | */ | |
1134 | ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); | |
55c52718 | 1135 | if (ret < 2) { |
1da177e4 LT |
1136 | message = "can't get hub status"; |
1137 | goto fail; | |
1138 | } | |
7d35b929 AS |
1139 | le16_to_cpus(&hubstatus); |
1140 | if (hdev == hdev->bus->root_hub) { | |
55c52718 AS |
1141 | if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) |
1142 | hub->mA_per_port = 500; | |
1143 | else { | |
1144 | hub->mA_per_port = hdev->bus_mA; | |
1145 | hub->limited_power = 1; | |
1146 | } | |
7d35b929 | 1147 | } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
1da177e4 LT |
1148 | dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", |
1149 | hub->descriptor->bHubContrCurrent); | |
55c52718 AS |
1150 | hub->limited_power = 1; |
1151 | if (hdev->maxchild > 0) { | |
1152 | int remaining = hdev->bus_mA - | |
1153 | hub->descriptor->bHubContrCurrent; | |
1154 | ||
1155 | if (remaining < hdev->maxchild * 100) | |
1156 | dev_warn(hub_dev, | |
1157 | "insufficient power available " | |
1158 | "to use all downstream ports\n"); | |
1159 | hub->mA_per_port = 100; /* 7.2.1.1 */ | |
1160 | } | |
1161 | } else { /* Self-powered external hub */ | |
1162 | /* FIXME: What about battery-powered external hubs that | |
1163 | * provide less current per port? */ | |
1164 | hub->mA_per_port = 500; | |
7d35b929 | 1165 | } |
55c52718 AS |
1166 | if (hub->mA_per_port < 500) |
1167 | dev_dbg(hub_dev, "%umA bus power budget for each child\n", | |
1168 | hub->mA_per_port); | |
1da177e4 | 1169 | |
b356b7c7 SS |
1170 | /* Update the HCD's internal representation of this hub before khubd |
1171 | * starts getting port status changes for devices under the hub. | |
1172 | */ | |
1173 | hcd = bus_to_hcd(hdev->bus); | |
1174 | if (hcd->driver->update_hub_device) { | |
1175 | ret = hcd->driver->update_hub_device(hcd, hdev, | |
1176 | &hub->tt, GFP_KERNEL); | |
1177 | if (ret < 0) { | |
1178 | message = "can't update HCD hub info"; | |
1179 | goto fail; | |
1180 | } | |
1181 | } | |
1182 | ||
1da177e4 LT |
1183 | ret = hub_hub_status(hub, &hubstatus, &hubchange); |
1184 | if (ret < 0) { | |
1185 | message = "can't get hub status"; | |
1186 | goto fail; | |
1187 | } | |
1188 | ||
1189 | /* local power status reports aren't always correct */ | |
1190 | if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) | |
1191 | dev_dbg(hub_dev, "local power source is %s\n", | |
1192 | (hubstatus & HUB_STATUS_LOCAL_POWER) | |
1193 | ? "lost (inactive)" : "good"); | |
1194 | ||
74ad9bd2 | 1195 | if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) |
1da177e4 LT |
1196 | dev_dbg(hub_dev, "%sover-current condition exists\n", |
1197 | (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); | |
1198 | ||
88fafff9 | 1199 | /* set up the interrupt endpoint |
1200 | * We use the EP's maxpacket size instead of (PORTS+1+7)/8 | |
1201 | * bytes as USB2.0[11.12.3] says because some hubs are known | |
1202 | * to send more data (and thus cause overflow). For root hubs, | |
1203 | * maxpktsize is defined in hcd.c's fake endpoint descriptors | |
1204 | * to be big enough for at least USB_MAXCHILDREN ports. */ | |
1da177e4 LT |
1205 | pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); |
1206 | maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); | |
1207 | ||
1208 | if (maxp > sizeof(*hub->buffer)) | |
1209 | maxp = sizeof(*hub->buffer); | |
1210 | ||
1211 | hub->urb = usb_alloc_urb(0, GFP_KERNEL); | |
1212 | if (!hub->urb) { | |
1da177e4 LT |
1213 | ret = -ENOMEM; |
1214 | goto fail; | |
1215 | } | |
1216 | ||
1217 | usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, | |
1218 | hub, endpoint->bInterval); | |
1da177e4 LT |
1219 | |
1220 | /* maybe cycle the hub leds */ | |
1221 | if (hub->has_indicators && blinkenlights) | |
1222 | hub->indicator [0] = INDICATOR_CYCLE; | |
1223 | ||
f2835219 | 1224 | hub_activate(hub, HUB_INIT); |
1da177e4 LT |
1225 | return 0; |
1226 | ||
1227 | fail: | |
1228 | dev_err (hub_dev, "config failed, %s (err %d)\n", | |
1229 | message, ret); | |
1230 | /* hub_disconnect() frees urb and descriptor */ | |
1231 | return ret; | |
1232 | } | |
1233 | ||
e8054854 AS |
1234 | static void hub_release(struct kref *kref) |
1235 | { | |
1236 | struct usb_hub *hub = container_of(kref, struct usb_hub, kref); | |
1237 | ||
1238 | usb_put_intf(to_usb_interface(hub->intfdev)); | |
1239 | kfree(hub); | |
1240 | } | |
1241 | ||
1da177e4 LT |
1242 | static unsigned highspeed_hubs; |
1243 | ||
1244 | static void hub_disconnect(struct usb_interface *intf) | |
1245 | { | |
1246 | struct usb_hub *hub = usb_get_intfdata (intf); | |
e8054854 AS |
1247 | |
1248 | /* Take the hub off the event list and don't let it be added again */ | |
1249 | spin_lock_irq(&hub_event_lock); | |
8e4ceb38 AS |
1250 | if (!list_empty(&hub->event_list)) { |
1251 | list_del_init(&hub->event_list); | |
1252 | usb_autopm_put_interface_no_suspend(intf); | |
1253 | } | |
e8054854 AS |
1254 | hub->disconnected = 1; |
1255 | spin_unlock_irq(&hub_event_lock); | |
1da177e4 | 1256 | |
7de18d8b AS |
1257 | /* Disconnect all children and quiesce the hub */ |
1258 | hub->error = 0; | |
4330354f | 1259 | hub_quiesce(hub, HUB_DISCONNECT); |
7de18d8b | 1260 | |
8b28c752 | 1261 | usb_set_intfdata (intf, NULL); |
7cbe5dca | 1262 | hub->hdev->maxchild = 0; |
1da177e4 | 1263 | |
e8054854 | 1264 | if (hub->hdev->speed == USB_SPEED_HIGH) |
1da177e4 LT |
1265 | highspeed_hubs--; |
1266 | ||
1da177e4 | 1267 | usb_free_urb(hub->urb); |
7cbe5dca | 1268 | kfree(hub->port_owners); |
1bc3c9e1 | 1269 | kfree(hub->descriptor); |
1bc3c9e1 | 1270 | kfree(hub->status); |
d697cdda | 1271 | kfree(hub->buffer); |
1da177e4 | 1272 | |
e8054854 | 1273 | kref_put(&hub->kref, hub_release); |
1da177e4 LT |
1274 | } |
1275 | ||
1276 | static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
1277 | { | |
1278 | struct usb_host_interface *desc; | |
1279 | struct usb_endpoint_descriptor *endpoint; | |
1280 | struct usb_device *hdev; | |
1281 | struct usb_hub *hub; | |
1282 | ||
1283 | desc = intf->cur_altsetting; | |
1284 | hdev = interface_to_usbdev(intf); | |
1285 | ||
0c9ffe0f SS |
1286 | /* Hubs have proper suspend/resume support. USB 3.0 device suspend is |
1287 | * different from USB 2.0/1.1 device suspend, and unfortunately we | |
1288 | * don't support it yet. So leave autosuspend disabled for USB 3.0 | |
1289 | * external hubs for now. Enable autosuspend for USB 3.0 roothubs, | |
1290 | * since that isn't a "real" hub. | |
1291 | */ | |
1292 | if (!hub_is_superspeed(hdev) || !hdev->parent) | |
1293 | usb_enable_autosuspend(hdev); | |
088f7fec | 1294 | |
38f3ad5e | 1295 | if (hdev->level == MAX_TOPO_LEVEL) { |
b9cef6c3 WF |
1296 | dev_err(&intf->dev, |
1297 | "Unsupported bus topology: hub nested too deep\n"); | |
38f3ad5e FB |
1298 | return -E2BIG; |
1299 | } | |
1300 | ||
89ccbdc9 DB |
1301 | #ifdef CONFIG_USB_OTG_BLACKLIST_HUB |
1302 | if (hdev->parent) { | |
1303 | dev_warn(&intf->dev, "ignoring external hub\n"); | |
1304 | return -ENODEV; | |
1305 | } | |
1306 | #endif | |
1307 | ||
1da177e4 LT |
1308 | /* Some hubs have a subclass of 1, which AFAICT according to the */ |
1309 | /* specs is not defined, but it works */ | |
1310 | if ((desc->desc.bInterfaceSubClass != 0) && | |
1311 | (desc->desc.bInterfaceSubClass != 1)) { | |
1312 | descriptor_error: | |
1313 | dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); | |
1314 | return -EIO; | |
1315 | } | |
1316 | ||
1317 | /* Multiple endpoints? What kind of mutant ninja-hub is this? */ | |
1318 | if (desc->desc.bNumEndpoints != 1) | |
1319 | goto descriptor_error; | |
1320 | ||
1321 | endpoint = &desc->endpoint[0].desc; | |
1322 | ||
fbf81c29 LFC |
1323 | /* If it's not an interrupt in endpoint, we'd better punt! */ |
1324 | if (!usb_endpoint_is_int_in(endpoint)) | |
1da177e4 LT |
1325 | goto descriptor_error; |
1326 | ||
1327 | /* We found a hub */ | |
1328 | dev_info (&intf->dev, "USB hub found\n"); | |
1329 | ||
0a1ef3b5 | 1330 | hub = kzalloc(sizeof(*hub), GFP_KERNEL); |
1da177e4 LT |
1331 | if (!hub) { |
1332 | dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); | |
1333 | return -ENOMEM; | |
1334 | } | |
1335 | ||
e8054854 | 1336 | kref_init(&hub->kref); |
1da177e4 LT |
1337 | INIT_LIST_HEAD(&hub->event_list); |
1338 | hub->intfdev = &intf->dev; | |
1339 | hub->hdev = hdev; | |
c4028958 | 1340 | INIT_DELAYED_WORK(&hub->leds, led_work); |
8520f380 | 1341 | INIT_DELAYED_WORK(&hub->init_work, NULL); |
e8054854 | 1342 | usb_get_intf(intf); |
1da177e4 LT |
1343 | |
1344 | usb_set_intfdata (intf, hub); | |
40f122f3 | 1345 | intf->needs_remote_wakeup = 1; |
1da177e4 LT |
1346 | |
1347 | if (hdev->speed == USB_SPEED_HIGH) | |
1348 | highspeed_hubs++; | |
1349 | ||
1350 | if (hub_configure(hub, endpoint) >= 0) | |
1351 | return 0; | |
1352 | ||
1353 | hub_disconnect (intf); | |
1354 | return -ENODEV; | |
1355 | } | |
1356 | ||
c532b29a | 1357 | /* No BKL needed */ |
1da177e4 LT |
1358 | static int |
1359 | hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) | |
1360 | { | |
1361 | struct usb_device *hdev = interface_to_usbdev (intf); | |
1362 | ||
1363 | /* assert ifno == 0 (part of hub spec) */ | |
1364 | switch (code) { | |
1365 | case USBDEVFS_HUB_PORTINFO: { | |
1366 | struct usbdevfs_hub_portinfo *info = user_data; | |
1367 | int i; | |
1368 | ||
1369 | spin_lock_irq(&device_state_lock); | |
1370 | if (hdev->devnum <= 0) | |
1371 | info->nports = 0; | |
1372 | else { | |
1373 | info->nports = hdev->maxchild; | |
1374 | for (i = 0; i < info->nports; i++) { | |
1375 | if (hdev->children[i] == NULL) | |
1376 | info->port[i] = 0; | |
1377 | else | |
1378 | info->port[i] = | |
1379 | hdev->children[i]->devnum; | |
1380 | } | |
1381 | } | |
1382 | spin_unlock_irq(&device_state_lock); | |
1383 | ||
1384 | return info->nports + 1; | |
1385 | } | |
1386 | ||
1387 | default: | |
1388 | return -ENOSYS; | |
1389 | } | |
1390 | } | |
1391 | ||
7cbe5dca AS |
1392 | /* |
1393 | * Allow user programs to claim ports on a hub. When a device is attached | |
1394 | * to one of these "claimed" ports, the program will "own" the device. | |
1395 | */ | |
1396 | static int find_port_owner(struct usb_device *hdev, unsigned port1, | |
1397 | void ***ppowner) | |
1398 | { | |
1399 | if (hdev->state == USB_STATE_NOTATTACHED) | |
1400 | return -ENODEV; | |
1401 | if (port1 == 0 || port1 > hdev->maxchild) | |
1402 | return -EINVAL; | |
1403 | ||
1404 | /* This assumes that devices not managed by the hub driver | |
1405 | * will always have maxchild equal to 0. | |
1406 | */ | |
1407 | *ppowner = &(hdev_to_hub(hdev)->port_owners[port1 - 1]); | |
1408 | return 0; | |
1409 | } | |
1410 | ||
1411 | /* In the following three functions, the caller must hold hdev's lock */ | |
1412 | int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, void *owner) | |
1413 | { | |
1414 | int rc; | |
1415 | void **powner; | |
1416 | ||
1417 | rc = find_port_owner(hdev, port1, &powner); | |
1418 | if (rc) | |
1419 | return rc; | |
1420 | if (*powner) | |
1421 | return -EBUSY; | |
1422 | *powner = owner; | |
1423 | return rc; | |
1424 | } | |
1425 | ||
1426 | int usb_hub_release_port(struct usb_device *hdev, unsigned port1, void *owner) | |
1427 | { | |
1428 | int rc; | |
1429 | void **powner; | |
1430 | ||
1431 | rc = find_port_owner(hdev, port1, &powner); | |
1432 | if (rc) | |
1433 | return rc; | |
1434 | if (*powner != owner) | |
1435 | return -ENOENT; | |
1436 | *powner = NULL; | |
1437 | return rc; | |
1438 | } | |
1439 | ||
1440 | void usb_hub_release_all_ports(struct usb_device *hdev, void *owner) | |
1441 | { | |
1442 | int n; | |
1443 | void **powner; | |
1444 | ||
1445 | n = find_port_owner(hdev, 1, &powner); | |
1446 | if (n == 0) { | |
1447 | for (; n < hdev->maxchild; (++n, ++powner)) { | |
1448 | if (*powner == owner) | |
1449 | *powner = NULL; | |
1450 | } | |
1451 | } | |
1452 | } | |
1453 | ||
1454 | /* The caller must hold udev's lock */ | |
1455 | bool usb_device_is_owned(struct usb_device *udev) | |
1456 | { | |
1457 | struct usb_hub *hub; | |
1458 | ||
1459 | if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) | |
1460 | return false; | |
1461 | hub = hdev_to_hub(udev->parent); | |
1462 | return !!hub->port_owners[udev->portnum - 1]; | |
1463 | } | |
1464 | ||
1da177e4 | 1465 | |
1da177e4 LT |
1466 | static void recursively_mark_NOTATTACHED(struct usb_device *udev) |
1467 | { | |
1468 | int i; | |
1469 | ||
1470 | for (i = 0; i < udev->maxchild; ++i) { | |
1471 | if (udev->children[i]) | |
1472 | recursively_mark_NOTATTACHED(udev->children[i]); | |
1473 | } | |
9bbdf1e0 | 1474 | if (udev->state == USB_STATE_SUSPENDED) |
15123006 | 1475 | udev->active_duration -= jiffies; |
1da177e4 LT |
1476 | udev->state = USB_STATE_NOTATTACHED; |
1477 | } | |
1478 | ||
1479 | /** | |
1480 | * usb_set_device_state - change a device's current state (usbcore, hcds) | |
1481 | * @udev: pointer to device whose state should be changed | |
1482 | * @new_state: new state value to be stored | |
1483 | * | |
1484 | * udev->state is _not_ fully protected by the device lock. Although | |
1485 | * most transitions are made only while holding the lock, the state can | |
1486 | * can change to USB_STATE_NOTATTACHED at almost any time. This | |
1487 | * is so that devices can be marked as disconnected as soon as possible, | |
1488 | * without having to wait for any semaphores to be released. As a result, | |
1489 | * all changes to any device's state must be protected by the | |
1490 | * device_state_lock spinlock. | |
1491 | * | |
1492 | * Once a device has been added to the device tree, all changes to its state | |
1493 | * should be made using this routine. The state should _not_ be set directly. | |
1494 | * | |
1495 | * If udev->state is already USB_STATE_NOTATTACHED then no change is made. | |
1496 | * Otherwise udev->state is set to new_state, and if new_state is | |
1497 | * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set | |
1498 | * to USB_STATE_NOTATTACHED. | |
1499 | */ | |
1500 | void usb_set_device_state(struct usb_device *udev, | |
1501 | enum usb_device_state new_state) | |
1502 | { | |
1503 | unsigned long flags; | |
4681b171 | 1504 | int wakeup = -1; |
1da177e4 LT |
1505 | |
1506 | spin_lock_irqsave(&device_state_lock, flags); | |
1507 | if (udev->state == USB_STATE_NOTATTACHED) | |
1508 | ; /* do nothing */ | |
b94dc6b5 | 1509 | else if (new_state != USB_STATE_NOTATTACHED) { |
fb669cc0 DB |
1510 | |
1511 | /* root hub wakeup capabilities are managed out-of-band | |
1512 | * and may involve silicon errata ... ignore them here. | |
1513 | */ | |
1514 | if (udev->parent) { | |
645daaab AS |
1515 | if (udev->state == USB_STATE_SUSPENDED |
1516 | || new_state == USB_STATE_SUSPENDED) | |
1517 | ; /* No change to wakeup settings */ | |
1518 | else if (new_state == USB_STATE_CONFIGURED) | |
4681b171 RW |
1519 | wakeup = udev->actconfig->desc.bmAttributes |
1520 | & USB_CONFIG_ATT_WAKEUP; | |
645daaab | 1521 | else |
4681b171 | 1522 | wakeup = 0; |
fb669cc0 | 1523 | } |
15123006 SS |
1524 | if (udev->state == USB_STATE_SUSPENDED && |
1525 | new_state != USB_STATE_SUSPENDED) | |
1526 | udev->active_duration -= jiffies; | |
1527 | else if (new_state == USB_STATE_SUSPENDED && | |
1528 | udev->state != USB_STATE_SUSPENDED) | |
1529 | udev->active_duration += jiffies; | |
645daaab | 1530 | udev->state = new_state; |
b94dc6b5 | 1531 | } else |
1da177e4 LT |
1532 | recursively_mark_NOTATTACHED(udev); |
1533 | spin_unlock_irqrestore(&device_state_lock, flags); | |
4681b171 RW |
1534 | if (wakeup >= 0) |
1535 | device_set_wakeup_capable(&udev->dev, wakeup); | |
1da177e4 | 1536 | } |
6da9c990 | 1537 | EXPORT_SYMBOL_GPL(usb_set_device_state); |
1da177e4 | 1538 | |
8af548dc | 1539 | /* |
3b29b68b AS |
1540 | * Choose a device number. |
1541 | * | |
1542 | * Device numbers are used as filenames in usbfs. On USB-1.1 and | |
1543 | * USB-2.0 buses they are also used as device addresses, however on | |
1544 | * USB-3.0 buses the address is assigned by the controller hardware | |
1545 | * and it usually is not the same as the device number. | |
1546 | * | |
8af548dc IPG |
1547 | * WUSB devices are simple: they have no hubs behind, so the mapping |
1548 | * device <-> virtual port number becomes 1:1. Why? to simplify the | |
1549 | * life of the device connection logic in | |
1550 | * drivers/usb/wusbcore/devconnect.c. When we do the initial secret | |
1551 | * handshake we need to assign a temporary address in the unauthorized | |
1552 | * space. For simplicity we use the first virtual port number found to | |
1553 | * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] | |
1554 | * and that becomes it's address [X < 128] or its unauthorized address | |
1555 | * [X | 0x80]. | |
1556 | * | |
1557 | * We add 1 as an offset to the one-based USB-stack port number | |
1558 | * (zero-based wusb virtual port index) for two reasons: (a) dev addr | |
1559 | * 0 is reserved by USB for default address; (b) Linux's USB stack | |
1560 | * uses always #1 for the root hub of the controller. So USB stack's | |
1561 | * port #1, which is wusb virtual-port #0 has address #2. | |
c6515272 SS |
1562 | * |
1563 | * Devices connected under xHCI are not as simple. The host controller | |
1564 | * supports virtualization, so the hardware assigns device addresses and | |
1565 | * the HCD must setup data structures before issuing a set address | |
1566 | * command to the hardware. | |
8af548dc | 1567 | */ |
3b29b68b | 1568 | static void choose_devnum(struct usb_device *udev) |
1da177e4 LT |
1569 | { |
1570 | int devnum; | |
1571 | struct usb_bus *bus = udev->bus; | |
1572 | ||
1573 | /* If khubd ever becomes multithreaded, this will need a lock */ | |
8af548dc IPG |
1574 | if (udev->wusb) { |
1575 | devnum = udev->portnum + 1; | |
1576 | BUG_ON(test_bit(devnum, bus->devmap.devicemap)); | |
1577 | } else { | |
1578 | /* Try to allocate the next devnum beginning at | |
1579 | * bus->devnum_next. */ | |
1580 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, | |
1581 | bus->devnum_next); | |
1582 | if (devnum >= 128) | |
1583 | devnum = find_next_zero_bit(bus->devmap.devicemap, | |
1584 | 128, 1); | |
1585 | bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); | |
1586 | } | |
1da177e4 LT |
1587 | if (devnum < 128) { |
1588 | set_bit(devnum, bus->devmap.devicemap); | |
1589 | udev->devnum = devnum; | |
1590 | } | |
1591 | } | |
1592 | ||
3b29b68b | 1593 | static void release_devnum(struct usb_device *udev) |
1da177e4 LT |
1594 | { |
1595 | if (udev->devnum > 0) { | |
1596 | clear_bit(udev->devnum, udev->bus->devmap.devicemap); | |
1597 | udev->devnum = -1; | |
1598 | } | |
1599 | } | |
1600 | ||
3b29b68b | 1601 | static void update_devnum(struct usb_device *udev, int devnum) |
4953d141 DV |
1602 | { |
1603 | /* The address for a WUSB device is managed by wusbcore. */ | |
1604 | if (!udev->wusb) | |
1605 | udev->devnum = devnum; | |
1606 | } | |
1607 | ||
f7410ced HX |
1608 | static void hub_free_dev(struct usb_device *udev) |
1609 | { | |
1610 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
1611 | ||
1612 | /* Root hubs aren't real devices, so don't free HCD resources */ | |
1613 | if (hcd->driver->free_dev && udev->parent) | |
1614 | hcd->driver->free_dev(hcd, udev); | |
1615 | } | |
1616 | ||
1da177e4 LT |
1617 | /** |
1618 | * usb_disconnect - disconnect a device (usbcore-internal) | |
1619 | * @pdev: pointer to device being disconnected | |
1620 | * Context: !in_interrupt () | |
1621 | * | |
1622 | * Something got disconnected. Get rid of it and all of its children. | |
1623 | * | |
1624 | * If *pdev is a normal device then the parent hub must already be locked. | |
1625 | * If *pdev is a root hub then this routine will acquire the | |
1626 | * usb_bus_list_lock on behalf of the caller. | |
1627 | * | |
1628 | * Only hub drivers (including virtual root hub drivers for host | |
1629 | * controllers) should ever call this. | |
1630 | * | |
1631 | * This call is synchronous, and may not be used in an interrupt context. | |
1632 | */ | |
1633 | void usb_disconnect(struct usb_device **pdev) | |
1634 | { | |
1635 | struct usb_device *udev = *pdev; | |
1636 | int i; | |
fccf4e86 | 1637 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 1638 | |
1da177e4 LT |
1639 | /* mark the device as inactive, so any further urb submissions for |
1640 | * this device (and any of its children) will fail immediately. | |
25985edc | 1641 | * this quiesces everything except pending urbs. |
1da177e4 LT |
1642 | */ |
1643 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
3b29b68b AS |
1644 | dev_info(&udev->dev, "USB disconnect, device number %d\n", |
1645 | udev->devnum); | |
1da177e4 | 1646 | |
9ad3d6cc AS |
1647 | usb_lock_device(udev); |
1648 | ||
1da177e4 LT |
1649 | /* Free up all the children before we remove this device */ |
1650 | for (i = 0; i < USB_MAXCHILDREN; i++) { | |
1651 | if (udev->children[i]) | |
1652 | usb_disconnect(&udev->children[i]); | |
1653 | } | |
1654 | ||
1655 | /* deallocate hcd/hardware state ... nuking all pending urbs and | |
1656 | * cleaning up all state associated with the current configuration | |
1657 | * so that the hardware is now fully quiesced. | |
1658 | */ | |
782da727 | 1659 | dev_dbg (&udev->dev, "unregistering device\n"); |
fccf4e86 | 1660 | mutex_lock(hcd->bandwidth_mutex); |
1da177e4 | 1661 | usb_disable_device(udev, 0); |
fccf4e86 | 1662 | mutex_unlock(hcd->bandwidth_mutex); |
cde217a5 | 1663 | usb_hcd_synchronize_unlinks(udev); |
1da177e4 | 1664 | |
3b23dd6f | 1665 | usb_remove_ep_devs(&udev->ep0); |
782da727 AS |
1666 | usb_unlock_device(udev); |
1667 | ||
1668 | /* Unregister the device. The device driver is responsible | |
3b23dd6f AS |
1669 | * for de-configuring the device and invoking the remove-device |
1670 | * notifier chain (used by usbfs and possibly others). | |
782da727 AS |
1671 | */ |
1672 | device_del(&udev->dev); | |
3099e75a | 1673 | |
782da727 | 1674 | /* Free the device number and delete the parent's children[] |
1da177e4 LT |
1675 | * (or root_hub) pointer. |
1676 | */ | |
3b29b68b | 1677 | release_devnum(udev); |
1da177e4 LT |
1678 | |
1679 | /* Avoid races with recursively_mark_NOTATTACHED() */ | |
1680 | spin_lock_irq(&device_state_lock); | |
1681 | *pdev = NULL; | |
1682 | spin_unlock_irq(&device_state_lock); | |
1683 | ||
f7410ced HX |
1684 | hub_free_dev(udev); |
1685 | ||
782da727 | 1686 | put_device(&udev->dev); |
1da177e4 LT |
1687 | } |
1688 | ||
f2a383e4 | 1689 | #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES |
1da177e4 LT |
1690 | static void show_string(struct usb_device *udev, char *id, char *string) |
1691 | { | |
1692 | if (!string) | |
1693 | return; | |
1694 | dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); | |
1695 | } | |
1696 | ||
f2a383e4 GKH |
1697 | static void announce_device(struct usb_device *udev) |
1698 | { | |
1699 | dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", | |
1700 | le16_to_cpu(udev->descriptor.idVendor), | |
1701 | le16_to_cpu(udev->descriptor.idProduct)); | |
b9cef6c3 WF |
1702 | dev_info(&udev->dev, |
1703 | "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", | |
f2a383e4 GKH |
1704 | udev->descriptor.iManufacturer, |
1705 | udev->descriptor.iProduct, | |
1706 | udev->descriptor.iSerialNumber); | |
1707 | show_string(udev, "Product", udev->product); | |
1708 | show_string(udev, "Manufacturer", udev->manufacturer); | |
1709 | show_string(udev, "SerialNumber", udev->serial); | |
1710 | } | |
1da177e4 | 1711 | #else |
f2a383e4 | 1712 | static inline void announce_device(struct usb_device *udev) { } |
1da177e4 LT |
1713 | #endif |
1714 | ||
1da177e4 LT |
1715 | #ifdef CONFIG_USB_OTG |
1716 | #include "otg_whitelist.h" | |
1717 | #endif | |
1718 | ||
3ede760f | 1719 | /** |
8d8558d1 | 1720 | * usb_enumerate_device_otg - FIXME (usbcore-internal) |
3ede760f ON |
1721 | * @udev: newly addressed device (in ADDRESS state) |
1722 | * | |
8d8558d1 | 1723 | * Finish enumeration for On-The-Go devices |
3ede760f | 1724 | */ |
8d8558d1 | 1725 | static int usb_enumerate_device_otg(struct usb_device *udev) |
1da177e4 | 1726 | { |
d9d16e8a | 1727 | int err = 0; |
1da177e4 LT |
1728 | |
1729 | #ifdef CONFIG_USB_OTG | |
1730 | /* | |
1731 | * OTG-aware devices on OTG-capable root hubs may be able to use SRP, | |
1732 | * to wake us after we've powered off VBUS; and HNP, switching roles | |
1733 | * "host" to "peripheral". The OTG descriptor helps figure this out. | |
1734 | */ | |
1735 | if (!udev->bus->is_b_host | |
1736 | && udev->config | |
1737 | && udev->parent == udev->bus->root_hub) { | |
2eb5052e | 1738 | struct usb_otg_descriptor *desc = NULL; |
1da177e4 LT |
1739 | struct usb_bus *bus = udev->bus; |
1740 | ||
1741 | /* descriptor may appear anywhere in config */ | |
1742 | if (__usb_get_extra_descriptor (udev->rawdescriptors[0], | |
1743 | le16_to_cpu(udev->config[0].desc.wTotalLength), | |
1744 | USB_DT_OTG, (void **) &desc) == 0) { | |
1745 | if (desc->bmAttributes & USB_OTG_HNP) { | |
12c3da34 | 1746 | unsigned port1 = udev->portnum; |
fc849b85 | 1747 | |
1da177e4 LT |
1748 | dev_info(&udev->dev, |
1749 | "Dual-Role OTG device on %sHNP port\n", | |
1750 | (port1 == bus->otg_port) | |
1751 | ? "" : "non-"); | |
1752 | ||
1753 | /* enable HNP before suspend, it's simpler */ | |
1754 | if (port1 == bus->otg_port) | |
1755 | bus->b_hnp_enable = 1; | |
1756 | err = usb_control_msg(udev, | |
1757 | usb_sndctrlpipe(udev, 0), | |
1758 | USB_REQ_SET_FEATURE, 0, | |
1759 | bus->b_hnp_enable | |
1760 | ? USB_DEVICE_B_HNP_ENABLE | |
1761 | : USB_DEVICE_A_ALT_HNP_SUPPORT, | |
1762 | 0, NULL, 0, USB_CTRL_SET_TIMEOUT); | |
1763 | if (err < 0) { | |
1764 | /* OTG MESSAGE: report errors here, | |
1765 | * customize to match your product. | |
1766 | */ | |
1767 | dev_info(&udev->dev, | |
b9cef6c3 | 1768 | "can't set HNP mode: %d\n", |
1da177e4 LT |
1769 | err); |
1770 | bus->b_hnp_enable = 0; | |
1771 | } | |
1772 | } | |
1773 | } | |
1774 | } | |
1775 | ||
1776 | if (!is_targeted(udev)) { | |
1777 | ||
1778 | /* Maybe it can talk to us, though we can't talk to it. | |
1779 | * (Includes HNP test device.) | |
1780 | */ | |
1781 | if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { | |
634a84f8 | 1782 | err = usb_port_suspend(udev, PMSG_SUSPEND); |
1da177e4 LT |
1783 | if (err < 0) |
1784 | dev_dbg(&udev->dev, "HNP fail, %d\n", err); | |
1785 | } | |
ffcdc18d | 1786 | err = -ENOTSUPP; |
1da177e4 LT |
1787 | goto fail; |
1788 | } | |
d9d16e8a | 1789 | fail: |
1da177e4 | 1790 | #endif |
d9d16e8a IPG |
1791 | return err; |
1792 | } | |
1793 | ||
1794 | ||
1795 | /** | |
8d8558d1 | 1796 | * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) |
d9d16e8a IPG |
1797 | * @udev: newly addressed device (in ADDRESS state) |
1798 | * | |
1799 | * This is only called by usb_new_device() and usb_authorize_device() | |
1800 | * and FIXME -- all comments that apply to them apply here wrt to | |
1801 | * environment. | |
1802 | * | |
1803 | * If the device is WUSB and not authorized, we don't attempt to read | |
1804 | * the string descriptors, as they will be errored out by the device | |
1805 | * until it has been authorized. | |
1806 | */ | |
8d8558d1 | 1807 | static int usb_enumerate_device(struct usb_device *udev) |
d9d16e8a IPG |
1808 | { |
1809 | int err; | |
1da177e4 | 1810 | |
d9d16e8a IPG |
1811 | if (udev->config == NULL) { |
1812 | err = usb_get_configuration(udev); | |
1813 | if (err < 0) { | |
1814 | dev_err(&udev->dev, "can't read configurations, error %d\n", | |
1815 | err); | |
1816 | goto fail; | |
1817 | } | |
1818 | } | |
1819 | if (udev->wusb == 1 && udev->authorized == 0) { | |
1820 | udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1821 | udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1822 | udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1823 | } | |
1824 | else { | |
1825 | /* read the standard strings and cache them if present */ | |
1826 | udev->product = usb_cache_string(udev, udev->descriptor.iProduct); | |
1827 | udev->manufacturer = usb_cache_string(udev, | |
1828 | udev->descriptor.iManufacturer); | |
1829 | udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); | |
1830 | } | |
8d8558d1 | 1831 | err = usb_enumerate_device_otg(udev); |
d9d16e8a IPG |
1832 | fail: |
1833 | return err; | |
1834 | } | |
1835 | ||
1836 | ||
1837 | /** | |
1838 | * usb_new_device - perform initial device setup (usbcore-internal) | |
1839 | * @udev: newly addressed device (in ADDRESS state) | |
1840 | * | |
8d8558d1 AS |
1841 | * This is called with devices which have been detected but not fully |
1842 | * enumerated. The device descriptor is available, but not descriptors | |
d9d16e8a IPG |
1843 | * for any device configuration. The caller must have locked either |
1844 | * the parent hub (if udev is a normal device) or else the | |
1845 | * usb_bus_list_lock (if udev is a root hub). The parent's pointer to | |
1846 | * udev has already been installed, but udev is not yet visible through | |
1847 | * sysfs or other filesystem code. | |
1848 | * | |
1849 | * It will return if the device is configured properly or not. Zero if | |
1850 | * the interface was registered with the driver core; else a negative | |
1851 | * errno value. | |
1852 | * | |
1853 | * This call is synchronous, and may not be used in an interrupt context. | |
1854 | * | |
1855 | * Only the hub driver or root-hub registrar should ever call this. | |
1856 | */ | |
1857 | int usb_new_device(struct usb_device *udev) | |
1858 | { | |
1859 | int err; | |
1860 | ||
16985408 | 1861 | if (udev->parent) { |
16985408 DS |
1862 | /* Initialize non-root-hub device wakeup to disabled; |
1863 | * device (un)configuration controls wakeup capable | |
1864 | * sysfs power/wakeup controls wakeup enabled/disabled | |
1865 | */ | |
1866 | device_init_wakeup(&udev->dev, 0); | |
16985408 DS |
1867 | } |
1868 | ||
9bbdf1e0 AS |
1869 | /* Tell the runtime-PM framework the device is active */ |
1870 | pm_runtime_set_active(&udev->dev); | |
c08512c7 | 1871 | pm_runtime_get_noresume(&udev->dev); |
fcc4a01e | 1872 | pm_runtime_use_autosuspend(&udev->dev); |
9bbdf1e0 AS |
1873 | pm_runtime_enable(&udev->dev); |
1874 | ||
c08512c7 AS |
1875 | /* By default, forbid autosuspend for all devices. It will be |
1876 | * allowed for hubs during binding. | |
1877 | */ | |
1878 | usb_disable_autosuspend(udev); | |
1879 | ||
8d8558d1 | 1880 | err = usb_enumerate_device(udev); /* Read descriptors */ |
d9d16e8a IPG |
1881 | if (err < 0) |
1882 | goto fail; | |
c6515272 SS |
1883 | dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", |
1884 | udev->devnum, udev->bus->busnum, | |
1885 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
9f8b17e6 KS |
1886 | /* export the usbdev device-node for libusb */ |
1887 | udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, | |
1888 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
1889 | ||
6cd13201 AS |
1890 | /* Tell the world! */ |
1891 | announce_device(udev); | |
195af2cc | 1892 | |
927bc916 | 1893 | device_enable_async_suspend(&udev->dev); |
782da727 | 1894 | /* Register the device. The device driver is responsible |
3b23dd6f AS |
1895 | * for configuring the device and invoking the add-device |
1896 | * notifier chain (used by usbfs and possibly others). | |
782da727 | 1897 | */ |
9f8b17e6 | 1898 | err = device_add(&udev->dev); |
1da177e4 LT |
1899 | if (err) { |
1900 | dev_err(&udev->dev, "can't device_add, error %d\n", err); | |
1901 | goto fail; | |
1902 | } | |
9ad3d6cc | 1903 | |
3b23dd6f | 1904 | (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); |
c08512c7 AS |
1905 | usb_mark_last_busy(udev); |
1906 | pm_runtime_put_sync_autosuspend(&udev->dev); | |
c066475e | 1907 | return err; |
1da177e4 LT |
1908 | |
1909 | fail: | |
1910 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
9bbdf1e0 AS |
1911 | pm_runtime_disable(&udev->dev); |
1912 | pm_runtime_set_suspended(&udev->dev); | |
d9d16e8a | 1913 | return err; |
1da177e4 LT |
1914 | } |
1915 | ||
93993a0a IPG |
1916 | |
1917 | /** | |
fd39c86b RD |
1918 | * usb_deauthorize_device - deauthorize a device (usbcore-internal) |
1919 | * @usb_dev: USB device | |
1920 | * | |
1921 | * Move the USB device to a very basic state where interfaces are disabled | |
1922 | * and the device is in fact unconfigured and unusable. | |
93993a0a IPG |
1923 | * |
1924 | * We share a lock (that we have) with device_del(), so we need to | |
1925 | * defer its call. | |
1926 | */ | |
1927 | int usb_deauthorize_device(struct usb_device *usb_dev) | |
1928 | { | |
93993a0a IPG |
1929 | usb_lock_device(usb_dev); |
1930 | if (usb_dev->authorized == 0) | |
1931 | goto out_unauthorized; | |
da307123 | 1932 | |
93993a0a IPG |
1933 | usb_dev->authorized = 0; |
1934 | usb_set_configuration(usb_dev, -1); | |
da307123 AS |
1935 | |
1936 | kfree(usb_dev->product); | |
93993a0a | 1937 | usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
da307123 | 1938 | kfree(usb_dev->manufacturer); |
93993a0a | 1939 | usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
da307123 | 1940 | kfree(usb_dev->serial); |
93993a0a | 1941 | usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
da307123 AS |
1942 | |
1943 | usb_destroy_configuration(usb_dev); | |
93993a0a | 1944 | usb_dev->descriptor.bNumConfigurations = 0; |
da307123 | 1945 | |
93993a0a IPG |
1946 | out_unauthorized: |
1947 | usb_unlock_device(usb_dev); | |
1948 | return 0; | |
1949 | } | |
1950 | ||
1951 | ||
1952 | int usb_authorize_device(struct usb_device *usb_dev) | |
1953 | { | |
1954 | int result = 0, c; | |
da307123 | 1955 | |
93993a0a IPG |
1956 | usb_lock_device(usb_dev); |
1957 | if (usb_dev->authorized == 1) | |
1958 | goto out_authorized; | |
da307123 | 1959 | |
93993a0a IPG |
1960 | result = usb_autoresume_device(usb_dev); |
1961 | if (result < 0) { | |
1962 | dev_err(&usb_dev->dev, | |
1963 | "can't autoresume for authorization: %d\n", result); | |
1964 | goto error_autoresume; | |
1965 | } | |
1966 | result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); | |
1967 | if (result < 0) { | |
1968 | dev_err(&usb_dev->dev, "can't re-read device descriptor for " | |
1969 | "authorization: %d\n", result); | |
1970 | goto error_device_descriptor; | |
1971 | } | |
da307123 AS |
1972 | |
1973 | kfree(usb_dev->product); | |
1974 | usb_dev->product = NULL; | |
1975 | kfree(usb_dev->manufacturer); | |
1976 | usb_dev->manufacturer = NULL; | |
1977 | kfree(usb_dev->serial); | |
1978 | usb_dev->serial = NULL; | |
1979 | ||
93993a0a | 1980 | usb_dev->authorized = 1; |
8d8558d1 | 1981 | result = usb_enumerate_device(usb_dev); |
93993a0a | 1982 | if (result < 0) |
8d8558d1 | 1983 | goto error_enumerate; |
93993a0a IPG |
1984 | /* Choose and set the configuration. This registers the interfaces |
1985 | * with the driver core and lets interface drivers bind to them. | |
1986 | */ | |
b5ea060f | 1987 | c = usb_choose_configuration(usb_dev); |
93993a0a IPG |
1988 | if (c >= 0) { |
1989 | result = usb_set_configuration(usb_dev, c); | |
1990 | if (result) { | |
1991 | dev_err(&usb_dev->dev, | |
1992 | "can't set config #%d, error %d\n", c, result); | |
1993 | /* This need not be fatal. The user can try to | |
1994 | * set other configurations. */ | |
1995 | } | |
1996 | } | |
1997 | dev_info(&usb_dev->dev, "authorized to connect\n"); | |
da307123 | 1998 | |
8d8558d1 | 1999 | error_enumerate: |
93993a0a | 2000 | error_device_descriptor: |
da307123 | 2001 | usb_autosuspend_device(usb_dev); |
93993a0a IPG |
2002 | error_autoresume: |
2003 | out_authorized: | |
2004 | usb_unlock_device(usb_dev); // complements locktree | |
2005 | return result; | |
2006 | } | |
2007 | ||
2008 | ||
0165de09 IPG |
2009 | /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ |
2010 | static unsigned hub_is_wusb(struct usb_hub *hub) | |
2011 | { | |
2012 | struct usb_hcd *hcd; | |
2013 | if (hub->hdev->parent != NULL) /* not a root hub? */ | |
2014 | return 0; | |
2015 | hcd = container_of(hub->hdev->bus, struct usb_hcd, self); | |
2016 | return hcd->wireless; | |
2017 | } | |
2018 | ||
2019 | ||
1da177e4 LT |
2020 | #define PORT_RESET_TRIES 5 |
2021 | #define SET_ADDRESS_TRIES 2 | |
2022 | #define GET_DESCRIPTOR_TRIES 2 | |
2023 | #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) | |
2024 | #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) | |
2025 | ||
2026 | #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ | |
2027 | #define HUB_SHORT_RESET_TIME 10 | |
75d7cf72 | 2028 | #define HUB_BH_RESET_TIME 50 |
1da177e4 LT |
2029 | #define HUB_LONG_RESET_TIME 200 |
2030 | #define HUB_RESET_TIMEOUT 500 | |
2031 | ||
10d674a8 SS |
2032 | static int hub_port_reset(struct usb_hub *hub, int port1, |
2033 | struct usb_device *udev, unsigned int delay, bool warm); | |
2034 | ||
2035 | /* Is a USB 3.0 port in the Inactive state? */ | |
2036 | static bool hub_port_inactive(struct usb_hub *hub, u16 portstatus) | |
2037 | { | |
2038 | return hub_is_superspeed(hub->hdev) && | |
2039 | (portstatus & USB_PORT_STAT_LINK_STATE) == | |
2040 | USB_SS_PORT_LS_SS_INACTIVE; | |
2041 | } | |
2042 | ||
1da177e4 | 2043 | static int hub_port_wait_reset(struct usb_hub *hub, int port1, |
75d7cf72 | 2044 | struct usb_device *udev, unsigned int delay, bool warm) |
1da177e4 LT |
2045 | { |
2046 | int delay_time, ret; | |
2047 | u16 portstatus; | |
2048 | u16 portchange; | |
2049 | ||
2050 | for (delay_time = 0; | |
2051 | delay_time < HUB_RESET_TIMEOUT; | |
2052 | delay_time += delay) { | |
2053 | /* wait to give the device a chance to reset */ | |
2054 | msleep(delay); | |
2055 | ||
2056 | /* read and decode port status */ | |
2057 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
2058 | if (ret < 0) | |
2059 | return ret; | |
2060 | ||
75d7cf72 AX |
2061 | /* |
2062 | * Some buggy devices require a warm reset to be issued even | |
2063 | * when the port appears not to be connected. | |
2064 | */ | |
2065 | if (!warm) { | |
10d674a8 SS |
2066 | /* |
2067 | * Some buggy devices can cause an NEC host controller | |
2068 | * to transition to the "Error" state after a hot port | |
2069 | * reset. This will show up as the port state in | |
2070 | * "Inactive", and the port may also report a | |
2071 | * disconnect. Forcing a warm port reset seems to make | |
2072 | * the device work. | |
2073 | * | |
2074 | * See https://bugzilla.kernel.org/show_bug.cgi?id=41752 | |
2075 | */ | |
2076 | if (hub_port_inactive(hub, portstatus)) { | |
2077 | int ret; | |
2078 | ||
2079 | if ((portchange & USB_PORT_STAT_C_CONNECTION)) | |
2080 | clear_port_feature(hub->hdev, port1, | |
2081 | USB_PORT_FEAT_C_CONNECTION); | |
2082 | if (portchange & USB_PORT_STAT_C_LINK_STATE) | |
2083 | clear_port_feature(hub->hdev, port1, | |
2084 | USB_PORT_FEAT_C_PORT_LINK_STATE); | |
2085 | if (portchange & USB_PORT_STAT_C_RESET) | |
2086 | clear_port_feature(hub->hdev, port1, | |
2087 | USB_PORT_FEAT_C_RESET); | |
2088 | dev_dbg(hub->intfdev, "hot reset failed, warm reset port %d\n", | |
2089 | port1); | |
2090 | ret = hub_port_reset(hub, port1, | |
2091 | udev, HUB_BH_RESET_TIME, | |
2092 | true); | |
2093 | if ((portchange & USB_PORT_STAT_C_CONNECTION)) | |
2094 | clear_port_feature(hub->hdev, port1, | |
2095 | USB_PORT_FEAT_C_CONNECTION); | |
2096 | return ret; | |
2097 | } | |
75d7cf72 AX |
2098 | /* Device went away? */ |
2099 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) | |
2100 | return -ENOTCONN; | |
2101 | ||
2102 | /* bomb out completely if the connection bounced */ | |
2103 | if ((portchange & USB_PORT_STAT_C_CONNECTION)) | |
2104 | return -ENOTCONN; | |
2105 | ||
2106 | /* if we`ve finished resetting, then break out of | |
2107 | * the loop | |
2108 | */ | |
2109 | if (!(portstatus & USB_PORT_STAT_RESET) && | |
2110 | (portstatus & USB_PORT_STAT_ENABLE)) { | |
2111 | if (hub_is_wusb(hub)) | |
2112 | udev->speed = USB_SPEED_WIRELESS; | |
2113 | else if (hub_is_superspeed(hub->hdev)) | |
2114 | udev->speed = USB_SPEED_SUPER; | |
2115 | else if (portstatus & USB_PORT_STAT_HIGH_SPEED) | |
2116 | udev->speed = USB_SPEED_HIGH; | |
2117 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) | |
2118 | udev->speed = USB_SPEED_LOW; | |
2119 | else | |
2120 | udev->speed = USB_SPEED_FULL; | |
2121 | return 0; | |
2122 | } | |
2123 | } else { | |
2124 | if (portchange & USB_PORT_STAT_C_BH_RESET) | |
2125 | return 0; | |
1da177e4 LT |
2126 | } |
2127 | ||
2128 | /* switch to the long delay after two short delay failures */ | |
2129 | if (delay_time >= 2 * HUB_SHORT_RESET_TIME) | |
2130 | delay = HUB_LONG_RESET_TIME; | |
2131 | ||
2132 | dev_dbg (hub->intfdev, | |
75d7cf72 AX |
2133 | "port %d not %sreset yet, waiting %dms\n", |
2134 | port1, warm ? "warm " : "", delay); | |
1da177e4 LT |
2135 | } |
2136 | ||
2137 | return -EBUSY; | |
2138 | } | |
2139 | ||
75d7cf72 AX |
2140 | static void hub_port_finish_reset(struct usb_hub *hub, int port1, |
2141 | struct usb_device *udev, int *status, bool warm) | |
2142 | { | |
2143 | switch (*status) { | |
2144 | case 0: | |
2145 | if (!warm) { | |
2146 | struct usb_hcd *hcd; | |
2147 | /* TRSTRCY = 10 ms; plus some extra */ | |
2148 | msleep(10 + 40); | |
2149 | update_devnum(udev, 0); | |
2150 | hcd = bus_to_hcd(udev->bus); | |
2151 | if (hcd->driver->reset_device) { | |
2152 | *status = hcd->driver->reset_device(hcd, udev); | |
2153 | if (*status < 0) { | |
2154 | dev_err(&udev->dev, "Cannot reset " | |
2155 | "HCD device state\n"); | |
2156 | break; | |
2157 | } | |
2158 | } | |
2159 | } | |
2160 | /* FALL THROUGH */ | |
2161 | case -ENOTCONN: | |
2162 | case -ENODEV: | |
2163 | clear_port_feature(hub->hdev, | |
2164 | port1, USB_PORT_FEAT_C_RESET); | |
2165 | /* FIXME need disconnect() for NOTATTACHED device */ | |
2166 | if (warm) { | |
2167 | clear_port_feature(hub->hdev, port1, | |
2168 | USB_PORT_FEAT_C_BH_PORT_RESET); | |
2169 | clear_port_feature(hub->hdev, port1, | |
2170 | USB_PORT_FEAT_C_PORT_LINK_STATE); | |
2171 | } else { | |
2172 | usb_set_device_state(udev, *status | |
2173 | ? USB_STATE_NOTATTACHED | |
2174 | : USB_STATE_DEFAULT); | |
2175 | } | |
2176 | break; | |
2177 | } | |
2178 | } | |
2179 | ||
2180 | /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ | |
1da177e4 | 2181 | static int hub_port_reset(struct usb_hub *hub, int port1, |
75d7cf72 | 2182 | struct usb_device *udev, unsigned int delay, bool warm) |
1da177e4 LT |
2183 | { |
2184 | int i, status; | |
2185 | ||
75d7cf72 AX |
2186 | if (!warm) { |
2187 | /* Block EHCI CF initialization during the port reset. | |
2188 | * Some companion controllers don't like it when they mix. | |
2189 | */ | |
2190 | down_read(&ehci_cf_port_reset_rwsem); | |
2191 | } else { | |
2192 | if (!hub_is_superspeed(hub->hdev)) { | |
2193 | dev_err(hub->intfdev, "only USB3 hub support " | |
2194 | "warm reset\n"); | |
2195 | return -EINVAL; | |
2196 | } | |
2197 | } | |
32fe0198 | 2198 | |
1da177e4 LT |
2199 | /* Reset the port */ |
2200 | for (i = 0; i < PORT_RESET_TRIES; i++) { | |
75d7cf72 AX |
2201 | status = set_port_feature(hub->hdev, port1, (warm ? |
2202 | USB_PORT_FEAT_BH_PORT_RESET : | |
2203 | USB_PORT_FEAT_RESET)); | |
2204 | if (status) { | |
1da177e4 | 2205 | dev_err(hub->intfdev, |
75d7cf72 AX |
2206 | "cannot %sreset port %d (err = %d)\n", |
2207 | warm ? "warm " : "", port1, status); | |
2208 | } else { | |
2209 | status = hub_port_wait_reset(hub, port1, udev, delay, | |
2210 | warm); | |
dd16525b | 2211 | if (status && status != -ENOTCONN) |
1da177e4 LT |
2212 | dev_dbg(hub->intfdev, |
2213 | "port_wait_reset: err = %d\n", | |
2214 | status); | |
2215 | } | |
2216 | ||
2217 | /* return on disconnect or reset */ | |
75d7cf72 AX |
2218 | if (status == 0 || status == -ENOTCONN || status == -ENODEV) { |
2219 | hub_port_finish_reset(hub, port1, udev, &status, warm); | |
32fe0198 | 2220 | goto done; |
1da177e4 LT |
2221 | } |
2222 | ||
2223 | dev_dbg (hub->intfdev, | |
75d7cf72 AX |
2224 | "port %d not enabled, trying %sreset again...\n", |
2225 | port1, warm ? "warm " : ""); | |
1da177e4 LT |
2226 | delay = HUB_LONG_RESET_TIME; |
2227 | } | |
2228 | ||
2229 | dev_err (hub->intfdev, | |
2230 | "Cannot enable port %i. Maybe the USB cable is bad?\n", | |
2231 | port1); | |
2232 | ||
75d7cf72 AX |
2233 | done: |
2234 | if (!warm) | |
2235 | up_read(&ehci_cf_port_reset_rwsem); | |
5e467f6e | 2236 | |
75d7cf72 | 2237 | return status; |
5e467f6e AX |
2238 | } |
2239 | ||
0ed9a57e AX |
2240 | /* Check if a port is power on */ |
2241 | static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) | |
2242 | { | |
2243 | int ret = 0; | |
2244 | ||
2245 | if (hub_is_superspeed(hub->hdev)) { | |
2246 | if (portstatus & USB_SS_PORT_STAT_POWER) | |
2247 | ret = 1; | |
2248 | } else { | |
2249 | if (portstatus & USB_PORT_STAT_POWER) | |
2250 | ret = 1; | |
2251 | } | |
2252 | ||
2253 | return ret; | |
2254 | } | |
2255 | ||
d388dab7 | 2256 | #ifdef CONFIG_PM |
1da177e4 | 2257 | |
0ed9a57e AX |
2258 | /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ |
2259 | static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) | |
2260 | { | |
2261 | int ret = 0; | |
2262 | ||
2263 | if (hub_is_superspeed(hub->hdev)) { | |
2264 | if ((portstatus & USB_PORT_STAT_LINK_STATE) | |
2265 | == USB_SS_PORT_LS_U3) | |
2266 | ret = 1; | |
2267 | } else { | |
2268 | if (portstatus & USB_PORT_STAT_SUSPEND) | |
2269 | ret = 1; | |
2270 | } | |
2271 | ||
2272 | return ret; | |
2273 | } | |
b01b03f3 AS |
2274 | |
2275 | /* Determine whether the device on a port is ready for a normal resume, | |
2276 | * is ready for a reset-resume, or should be disconnected. | |
2277 | */ | |
2278 | static int check_port_resume_type(struct usb_device *udev, | |
2279 | struct usb_hub *hub, int port1, | |
2280 | int status, unsigned portchange, unsigned portstatus) | |
2281 | { | |
2282 | /* Is the device still present? */ | |
0ed9a57e AX |
2283 | if (status || port_is_suspended(hub, portstatus) || |
2284 | !port_is_power_on(hub, portstatus) || | |
2285 | !(portstatus & USB_PORT_STAT_CONNECTION)) { | |
b01b03f3 AS |
2286 | if (status >= 0) |
2287 | status = -ENODEV; | |
2288 | } | |
2289 | ||
86c57edf AS |
2290 | /* Can't do a normal resume if the port isn't enabled, |
2291 | * so try a reset-resume instead. | |
2292 | */ | |
2293 | else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { | |
2294 | if (udev->persist_enabled) | |
2295 | udev->reset_resume = 1; | |
2296 | else | |
2297 | status = -ENODEV; | |
2298 | } | |
b01b03f3 AS |
2299 | |
2300 | if (status) { | |
2301 | dev_dbg(hub->intfdev, | |
2302 | "port %d status %04x.%04x after resume, %d\n", | |
2303 | port1, portchange, portstatus, status); | |
2304 | } else if (udev->reset_resume) { | |
2305 | ||
2306 | /* Late port handoff can set status-change bits */ | |
2307 | if (portchange & USB_PORT_STAT_C_CONNECTION) | |
2308 | clear_port_feature(hub->hdev, port1, | |
2309 | USB_PORT_FEAT_C_CONNECTION); | |
2310 | if (portchange & USB_PORT_STAT_C_ENABLE) | |
2311 | clear_port_feature(hub->hdev, port1, | |
2312 | USB_PORT_FEAT_C_ENABLE); | |
2313 | } | |
2314 | ||
2315 | return status; | |
2316 | } | |
2317 | ||
1da177e4 LT |
2318 | #ifdef CONFIG_USB_SUSPEND |
2319 | ||
2320 | /* | |
624d6c07 AS |
2321 | * usb_port_suspend - suspend a usb device's upstream port |
2322 | * @udev: device that's no longer in active use, not a root hub | |
2323 | * Context: must be able to sleep; device not locked; pm locks held | |
2324 | * | |
2325 | * Suspends a USB device that isn't in active use, conserving power. | |
2326 | * Devices may wake out of a suspend, if anything important happens, | |
2327 | * using the remote wakeup mechanism. They may also be taken out of | |
2328 | * suspend by the host, using usb_port_resume(). It's also routine | |
2329 | * to disconnect devices while they are suspended. | |
2330 | * | |
2331 | * This only affects the USB hardware for a device; its interfaces | |
2332 | * (and, for hubs, child devices) must already have been suspended. | |
2333 | * | |
1da177e4 LT |
2334 | * Selective port suspend reduces power; most suspended devices draw |
2335 | * less than 500 uA. It's also used in OTG, along with remote wakeup. | |
2336 | * All devices below the suspended port are also suspended. | |
2337 | * | |
2338 | * Devices leave suspend state when the host wakes them up. Some devices | |
2339 | * also support "remote wakeup", where the device can activate the USB | |
2340 | * tree above them to deliver data, such as a keypress or packet. In | |
2341 | * some cases, this wakes the USB host. | |
624d6c07 AS |
2342 | * |
2343 | * Suspending OTG devices may trigger HNP, if that's been enabled | |
2344 | * between a pair of dual-role devices. That will change roles, such | |
2345 | * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. | |
2346 | * | |
2347 | * Devices on USB hub ports have only one "suspend" state, corresponding | |
2348 | * to ACPI D2, "may cause the device to lose some context". | |
2349 | * State transitions include: | |
2350 | * | |
2351 | * - suspend, resume ... when the VBUS power link stays live | |
2352 | * - suspend, disconnect ... VBUS lost | |
2353 | * | |
2354 | * Once VBUS drop breaks the circuit, the port it's using has to go through | |
2355 | * normal re-enumeration procedures, starting with enabling VBUS power. | |
2356 | * Other than re-initializing the hub (plug/unplug, except for root hubs), | |
2357 | * Linux (2.6) currently has NO mechanisms to initiate that: no khubd | |
2358 | * timer, no SRP, no requests through sysfs. | |
2359 | * | |
2360 | * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when | |
2361 | * the root hub for their bus goes into global suspend ... so we don't | |
2362 | * (falsely) update the device power state to say it suspended. | |
2363 | * | |
2364 | * Returns 0 on success, else negative errno. | |
1da177e4 | 2365 | */ |
65bfd296 | 2366 | int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 2367 | { |
624d6c07 AS |
2368 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
2369 | int port1 = udev->portnum; | |
2370 | int status; | |
1da177e4 LT |
2371 | |
2372 | // dev_dbg(hub->intfdev, "suspend port %d\n", port1); | |
2373 | ||
2374 | /* enable remote wakeup when appropriate; this lets the device | |
2375 | * wake up the upstream hub (including maybe the root hub). | |
2376 | * | |
2377 | * NOTE: OTG devices may issue remote wakeup (or SRP) even when | |
2378 | * we don't explicitly enable it here. | |
2379 | */ | |
645daaab | 2380 | if (udev->do_remote_wakeup) { |
1da177e4 LT |
2381 | status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
2382 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
2383 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
2384 | NULL, 0, | |
2385 | USB_CTRL_SET_TIMEOUT); | |
0c487206 | 2386 | if (status) { |
624d6c07 AS |
2387 | dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", |
2388 | status); | |
0c487206 ON |
2389 | /* bail if autosuspend is requested */ |
2390 | if (msg.event & PM_EVENT_AUTO) | |
2391 | return status; | |
2392 | } | |
1da177e4 LT |
2393 | } |
2394 | ||
2395 | /* see 7.1.7.6 */ | |
a7114230 AX |
2396 | if (hub_is_superspeed(hub->hdev)) |
2397 | status = set_port_feature(hub->hdev, | |
2398 | port1 | (USB_SS_PORT_LS_U3 << 3), | |
2399 | USB_PORT_FEAT_LINK_STATE); | |
a8f08d86 AX |
2400 | else |
2401 | status = set_port_feature(hub->hdev, port1, | |
2402 | USB_PORT_FEAT_SUSPEND); | |
1da177e4 | 2403 | if (status) { |
624d6c07 AS |
2404 | dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", |
2405 | port1, status); | |
1da177e4 | 2406 | /* paranoia: "should not happen" */ |
0c487206 ON |
2407 | if (udev->do_remote_wakeup) |
2408 | (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
1da177e4 LT |
2409 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, |
2410 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
2411 | NULL, 0, | |
2412 | USB_CTRL_SET_TIMEOUT); | |
cbb33004 AS |
2413 | |
2414 | /* System sleep transitions should never fail */ | |
2415 | if (!(msg.event & PM_EVENT_AUTO)) | |
2416 | status = 0; | |
1da177e4 LT |
2417 | } else { |
2418 | /* device has up to 10 msec to fully suspend */ | |
645daaab | 2419 | dev_dbg(&udev->dev, "usb %ssuspend\n", |
65bfd296 | 2420 | (msg.event & PM_EVENT_AUTO ? "auto-" : "")); |
1da177e4 LT |
2421 | usb_set_device_state(udev, USB_STATE_SUSPENDED); |
2422 | msleep(10); | |
2423 | } | |
c08512c7 | 2424 | usb_mark_last_busy(hub->hdev); |
1da177e4 LT |
2425 | return status; |
2426 | } | |
2427 | ||
1da177e4 | 2428 | /* |
390a8c34 DB |
2429 | * If the USB "suspend" state is in use (rather than "global suspend"), |
2430 | * many devices will be individually taken out of suspend state using | |
54515fe5 | 2431 | * special "resume" signaling. This routine kicks in shortly after |
1da177e4 LT |
2432 | * hardware resume signaling is finished, either because of selective |
2433 | * resume (by host) or remote wakeup (by device) ... now see what changed | |
2434 | * in the tree that's rooted at this device. | |
54515fe5 AS |
2435 | * |
2436 | * If @udev->reset_resume is set then the device is reset before the | |
2437 | * status check is done. | |
1da177e4 | 2438 | */ |
140d8f68 | 2439 | static int finish_port_resume(struct usb_device *udev) |
1da177e4 | 2440 | { |
54515fe5 | 2441 | int status = 0; |
1da177e4 LT |
2442 | u16 devstatus; |
2443 | ||
2444 | /* caller owns the udev device lock */ | |
b9cef6c3 WF |
2445 | dev_dbg(&udev->dev, "%s\n", |
2446 | udev->reset_resume ? "finish reset-resume" : "finish resume"); | |
1da177e4 LT |
2447 | |
2448 | /* usb ch9 identifies four variants of SUSPENDED, based on what | |
2449 | * state the device resumes to. Linux currently won't see the | |
2450 | * first two on the host side; they'd be inside hub_port_init() | |
2451 | * during many timeouts, but khubd can't suspend until later. | |
2452 | */ | |
2453 | usb_set_device_state(udev, udev->actconfig | |
2454 | ? USB_STATE_CONFIGURED | |
2455 | : USB_STATE_ADDRESS); | |
1da177e4 | 2456 | |
54515fe5 AS |
2457 | /* 10.5.4.5 says not to reset a suspended port if the attached |
2458 | * device is enabled for remote wakeup. Hence the reset | |
2459 | * operation is carried out here, after the port has been | |
2460 | * resumed. | |
2461 | */ | |
2462 | if (udev->reset_resume) | |
86c57edf | 2463 | retry_reset_resume: |
742120c6 | 2464 | status = usb_reset_and_verify_device(udev); |
54515fe5 | 2465 | |
1da177e4 LT |
2466 | /* 10.5.4.5 says be sure devices in the tree are still there. |
2467 | * For now let's assume the device didn't go crazy on resume, | |
2468 | * and device drivers will know about any resume quirks. | |
2469 | */ | |
54515fe5 | 2470 | if (status == 0) { |
46dede46 | 2471 | devstatus = 0; |
54515fe5 AS |
2472 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); |
2473 | if (status >= 0) | |
46dede46 | 2474 | status = (status > 0 ? 0 : -ENODEV); |
86c57edf AS |
2475 | |
2476 | /* If a normal resume failed, try doing a reset-resume */ | |
2477 | if (status && !udev->reset_resume && udev->persist_enabled) { | |
2478 | dev_dbg(&udev->dev, "retry with reset-resume\n"); | |
2479 | udev->reset_resume = 1; | |
2480 | goto retry_reset_resume; | |
2481 | } | |
54515fe5 | 2482 | } |
b40b7a90 | 2483 | |
624d6c07 AS |
2484 | if (status) { |
2485 | dev_dbg(&udev->dev, "gone after usb resume? status %d\n", | |
2486 | status); | |
2487 | } else if (udev->actconfig) { | |
1da177e4 | 2488 | le16_to_cpus(&devstatus); |
686314cf | 2489 | if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) { |
1da177e4 LT |
2490 | status = usb_control_msg(udev, |
2491 | usb_sndctrlpipe(udev, 0), | |
2492 | USB_REQ_CLEAR_FEATURE, | |
2493 | USB_RECIP_DEVICE, | |
2494 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
2495 | NULL, 0, | |
2496 | USB_CTRL_SET_TIMEOUT); | |
a8e7c565 | 2497 | if (status) |
b9cef6c3 WF |
2498 | dev_dbg(&udev->dev, |
2499 | "disable remote wakeup, status %d\n", | |
2500 | status); | |
4bf0ba86 | 2501 | } |
1da177e4 | 2502 | status = 0; |
1da177e4 LT |
2503 | } |
2504 | return status; | |
2505 | } | |
2506 | ||
624d6c07 AS |
2507 | /* |
2508 | * usb_port_resume - re-activate a suspended usb device's upstream port | |
2509 | * @udev: device to re-activate, not a root hub | |
2510 | * Context: must be able to sleep; device not locked; pm locks held | |
2511 | * | |
2512 | * This will re-activate the suspended device, increasing power usage | |
2513 | * while letting drivers communicate again with its endpoints. | |
2514 | * USB resume explicitly guarantees that the power session between | |
2515 | * the host and the device is the same as it was when the device | |
2516 | * suspended. | |
2517 | * | |
feccc30d AS |
2518 | * If @udev->reset_resume is set then this routine won't check that the |
2519 | * port is still enabled. Furthermore, finish_port_resume() above will | |
54515fe5 AS |
2520 | * reset @udev. The end result is that a broken power session can be |
2521 | * recovered and @udev will appear to persist across a loss of VBUS power. | |
2522 | * | |
2523 | * For example, if a host controller doesn't maintain VBUS suspend current | |
2524 | * during a system sleep or is reset when the system wakes up, all the USB | |
2525 | * power sessions below it will be broken. This is especially troublesome | |
2526 | * for mass-storage devices containing mounted filesystems, since the | |
2527 | * device will appear to have disconnected and all the memory mappings | |
2528 | * to it will be lost. Using the USB_PERSIST facility, the device can be | |
2529 | * made to appear as if it had not disconnected. | |
2530 | * | |
742120c6 | 2531 | * This facility can be dangerous. Although usb_reset_and_verify_device() makes |
feccc30d | 2532 | * every effort to insure that the same device is present after the |
54515fe5 AS |
2533 | * reset as before, it cannot provide a 100% guarantee. Furthermore it's |
2534 | * quite possible for a device to remain unaltered but its media to be | |
2535 | * changed. If the user replaces a flash memory card while the system is | |
2536 | * asleep, he will have only himself to blame when the filesystem on the | |
2537 | * new card is corrupted and the system crashes. | |
2538 | * | |
624d6c07 AS |
2539 | * Returns 0 on success, else negative errno. |
2540 | */ | |
65bfd296 | 2541 | int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 2542 | { |
624d6c07 AS |
2543 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
2544 | int port1 = udev->portnum; | |
2545 | int status; | |
2546 | u16 portchange, portstatus; | |
d25450c6 AS |
2547 | |
2548 | /* Skip the initial Clear-Suspend step for a remote wakeup */ | |
2549 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
0ed9a57e | 2550 | if (status == 0 && !port_is_suspended(hub, portstatus)) |
d25450c6 | 2551 | goto SuspendCleared; |
1da177e4 LT |
2552 | |
2553 | // dev_dbg(hub->intfdev, "resume port %d\n", port1); | |
2554 | ||
d5cbad4b AS |
2555 | set_bit(port1, hub->busy_bits); |
2556 | ||
1da177e4 | 2557 | /* see 7.1.7.7; affects power usage, but not budgeting */ |
a7114230 AX |
2558 | if (hub_is_superspeed(hub->hdev)) |
2559 | status = set_port_feature(hub->hdev, | |
2560 | port1 | (USB_SS_PORT_LS_U0 << 3), | |
2561 | USB_PORT_FEAT_LINK_STATE); | |
2562 | else | |
2563 | status = clear_port_feature(hub->hdev, | |
2564 | port1, USB_PORT_FEAT_SUSPEND); | |
1da177e4 | 2565 | if (status) { |
624d6c07 AS |
2566 | dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", |
2567 | port1, status); | |
1da177e4 | 2568 | } else { |
1da177e4 | 2569 | /* drive resume for at least 20 msec */ |
686314cf | 2570 | dev_dbg(&udev->dev, "usb %sresume\n", |
65bfd296 | 2571 | (msg.event & PM_EVENT_AUTO ? "auto-" : "")); |
1da177e4 LT |
2572 | msleep(25); |
2573 | ||
1da177e4 LT |
2574 | /* Virtual root hubs can trigger on GET_PORT_STATUS to |
2575 | * stop resume signaling. Then finish the resume | |
2576 | * sequence. | |
2577 | */ | |
d25450c6 | 2578 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
54515fe5 | 2579 | |
b01b03f3 AS |
2580 | /* TRSMRCY = 10 msec */ |
2581 | msleep(10); | |
2582 | } | |
2583 | ||
54515fe5 | 2584 | SuspendCleared: |
b01b03f3 | 2585 | if (status == 0) { |
a7114230 AX |
2586 | if (hub_is_superspeed(hub->hdev)) { |
2587 | if (portchange & USB_PORT_STAT_C_LINK_STATE) | |
2588 | clear_port_feature(hub->hdev, port1, | |
2589 | USB_PORT_FEAT_C_PORT_LINK_STATE); | |
2590 | } else { | |
2591 | if (portchange & USB_PORT_STAT_C_SUSPEND) | |
2592 | clear_port_feature(hub->hdev, port1, | |
2593 | USB_PORT_FEAT_C_SUSPEND); | |
2594 | } | |
1da177e4 | 2595 | } |
1da177e4 | 2596 | |
d5cbad4b | 2597 | clear_bit(port1, hub->busy_bits); |
d5cbad4b | 2598 | |
b01b03f3 AS |
2599 | status = check_port_resume_type(udev, |
2600 | hub, port1, status, portchange, portstatus); | |
54515fe5 AS |
2601 | if (status == 0) |
2602 | status = finish_port_resume(udev); | |
2603 | if (status < 0) { | |
2604 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); | |
2605 | hub_port_logical_disconnect(hub, port1); | |
2606 | } | |
1da177e4 LT |
2607 | return status; |
2608 | } | |
2609 | ||
8808f00c | 2610 | /* caller has locked udev */ |
0534d468 | 2611 | int usb_remote_wakeup(struct usb_device *udev) |
1da177e4 LT |
2612 | { |
2613 | int status = 0; | |
2614 | ||
1da177e4 | 2615 | if (udev->state == USB_STATE_SUSPENDED) { |
645daaab | 2616 | dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); |
9bbdf1e0 AS |
2617 | status = usb_autoresume_device(udev); |
2618 | if (status == 0) { | |
2619 | /* Let the drivers do their thing, then... */ | |
2620 | usb_autosuspend_device(udev); | |
2621 | } | |
1da177e4 | 2622 | } |
1da177e4 LT |
2623 | return status; |
2624 | } | |
2625 | ||
d388dab7 AS |
2626 | #else /* CONFIG_USB_SUSPEND */ |
2627 | ||
2628 | /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ | |
2629 | ||
65bfd296 | 2630 | int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
d388dab7 AS |
2631 | { |
2632 | return 0; | |
2633 | } | |
2634 | ||
b01b03f3 AS |
2635 | /* However we may need to do a reset-resume */ |
2636 | ||
65bfd296 | 2637 | int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
d388dab7 | 2638 | { |
b01b03f3 AS |
2639 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
2640 | int port1 = udev->portnum; | |
2641 | int status; | |
2642 | u16 portchange, portstatus; | |
2643 | ||
2644 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
2645 | status = check_port_resume_type(udev, | |
2646 | hub, port1, status, portchange, portstatus); | |
54515fe5 | 2647 | |
b01b03f3 AS |
2648 | if (status) { |
2649 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); | |
2650 | hub_port_logical_disconnect(hub, port1); | |
2651 | } else if (udev->reset_resume) { | |
54515fe5 | 2652 | dev_dbg(&udev->dev, "reset-resume\n"); |
742120c6 | 2653 | status = usb_reset_and_verify_device(udev); |
54515fe5 AS |
2654 | } |
2655 | return status; | |
d388dab7 AS |
2656 | } |
2657 | ||
d388dab7 AS |
2658 | #endif |
2659 | ||
db690874 | 2660 | static int hub_suspend(struct usb_interface *intf, pm_message_t msg) |
1da177e4 LT |
2661 | { |
2662 | struct usb_hub *hub = usb_get_intfdata (intf); | |
2663 | struct usb_device *hdev = hub->hdev; | |
2664 | unsigned port1; | |
1da177e4 | 2665 | |
cbb33004 | 2666 | /* Warn if children aren't already suspended */ |
1da177e4 LT |
2667 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
2668 | struct usb_device *udev; | |
2669 | ||
2670 | udev = hdev->children [port1-1]; | |
6840d255 | 2671 | if (udev && udev->can_submit) { |
cbb33004 AS |
2672 | dev_warn(&intf->dev, "port %d nyet suspended\n", port1); |
2673 | if (msg.event & PM_EVENT_AUTO) | |
2674 | return -EBUSY; | |
c9f89fa4 | 2675 | } |
1da177e4 LT |
2676 | } |
2677 | ||
441b62c1 | 2678 | dev_dbg(&intf->dev, "%s\n", __func__); |
40f122f3 | 2679 | |
12f1ff83 | 2680 | /* stop khubd and related activity */ |
4330354f | 2681 | hub_quiesce(hub, HUB_SUSPEND); |
b6f6436d | 2682 | return 0; |
1da177e4 LT |
2683 | } |
2684 | ||
2685 | static int hub_resume(struct usb_interface *intf) | |
2686 | { | |
5e6effae | 2687 | struct usb_hub *hub = usb_get_intfdata(intf); |
40f122f3 | 2688 | |
5e6effae | 2689 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 2690 | hub_activate(hub, HUB_RESUME); |
1da177e4 LT |
2691 | return 0; |
2692 | } | |
2693 | ||
b41a60ec | 2694 | static int hub_reset_resume(struct usb_interface *intf) |
f07600cf | 2695 | { |
b41a60ec | 2696 | struct usb_hub *hub = usb_get_intfdata(intf); |
f07600cf | 2697 | |
5e6effae | 2698 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 2699 | hub_activate(hub, HUB_RESET_RESUME); |
f07600cf AS |
2700 | return 0; |
2701 | } | |
2702 | ||
54515fe5 AS |
2703 | /** |
2704 | * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power | |
2705 | * @rhdev: struct usb_device for the root hub | |
2706 | * | |
2707 | * The USB host controller driver calls this function when its root hub | |
2708 | * is resumed and Vbus power has been interrupted or the controller | |
feccc30d AS |
2709 | * has been reset. The routine marks @rhdev as having lost power. |
2710 | * When the hub driver is resumed it will take notice and carry out | |
2711 | * power-session recovery for all the "USB-PERSIST"-enabled child devices; | |
2712 | * the others will be disconnected. | |
54515fe5 AS |
2713 | */ |
2714 | void usb_root_hub_lost_power(struct usb_device *rhdev) | |
2715 | { | |
2716 | dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); | |
2717 | rhdev->reset_resume = 1; | |
2718 | } | |
2719 | EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); | |
2720 | ||
d388dab7 AS |
2721 | #else /* CONFIG_PM */ |
2722 | ||
f07600cf AS |
2723 | #define hub_suspend NULL |
2724 | #define hub_resume NULL | |
2725 | #define hub_reset_resume NULL | |
d388dab7 AS |
2726 | #endif |
2727 | ||
1da177e4 LT |
2728 | |
2729 | /* USB 2.0 spec, 7.1.7.3 / fig 7-29: | |
2730 | * | |
2731 | * Between connect detection and reset signaling there must be a delay | |
2732 | * of 100ms at least for debounce and power-settling. The corresponding | |
2733 | * timer shall restart whenever the downstream port detects a disconnect. | |
2734 | * | |
2735 | * Apparently there are some bluetooth and irda-dongles and a number of | |
2736 | * low-speed devices for which this debounce period may last over a second. | |
2737 | * Not covered by the spec - but easy to deal with. | |
2738 | * | |
2739 | * This implementation uses a 1500ms total debounce timeout; if the | |
2740 | * connection isn't stable by then it returns -ETIMEDOUT. It checks | |
2741 | * every 25ms for transient disconnects. When the port status has been | |
2742 | * unchanged for 100ms it returns the port status. | |
2743 | */ | |
1da177e4 LT |
2744 | static int hub_port_debounce(struct usb_hub *hub, int port1) |
2745 | { | |
2746 | int ret; | |
2747 | int total_time, stable_time = 0; | |
2748 | u16 portchange, portstatus; | |
2749 | unsigned connection = 0xffff; | |
2750 | ||
2751 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { | |
2752 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
2753 | if (ret < 0) | |
2754 | return ret; | |
2755 | ||
2756 | if (!(portchange & USB_PORT_STAT_C_CONNECTION) && | |
2757 | (portstatus & USB_PORT_STAT_CONNECTION) == connection) { | |
2758 | stable_time += HUB_DEBOUNCE_STEP; | |
2759 | if (stable_time >= HUB_DEBOUNCE_STABLE) | |
2760 | break; | |
2761 | } else { | |
2762 | stable_time = 0; | |
2763 | connection = portstatus & USB_PORT_STAT_CONNECTION; | |
2764 | } | |
2765 | ||
2766 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
2767 | clear_port_feature(hub->hdev, port1, | |
2768 | USB_PORT_FEAT_C_CONNECTION); | |
2769 | } | |
2770 | ||
2771 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
2772 | break; | |
2773 | msleep(HUB_DEBOUNCE_STEP); | |
2774 | } | |
2775 | ||
2776 | dev_dbg (hub->intfdev, | |
2777 | "debounce: port %d: total %dms stable %dms status 0x%x\n", | |
2778 | port1, total_time, stable_time, portstatus); | |
2779 | ||
2780 | if (stable_time < HUB_DEBOUNCE_STABLE) | |
2781 | return -ETIMEDOUT; | |
2782 | return portstatus; | |
2783 | } | |
2784 | ||
fc721f51 | 2785 | void usb_ep0_reinit(struct usb_device *udev) |
1da177e4 | 2786 | { |
ddeac4e7 AS |
2787 | usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); |
2788 | usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); | |
2caf7fcd | 2789 | usb_enable_endpoint(udev, &udev->ep0, true); |
1da177e4 | 2790 | } |
fc721f51 | 2791 | EXPORT_SYMBOL_GPL(usb_ep0_reinit); |
1da177e4 LT |
2792 | |
2793 | #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) | |
2794 | #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) | |
2795 | ||
4326ed0b | 2796 | static int hub_set_address(struct usb_device *udev, int devnum) |
1da177e4 LT |
2797 | { |
2798 | int retval; | |
c6515272 | 2799 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 2800 | |
c6515272 SS |
2801 | /* |
2802 | * The host controller will choose the device address, | |
2803 | * instead of the core having chosen it earlier | |
2804 | */ | |
2805 | if (!hcd->driver->address_device && devnum <= 1) | |
1da177e4 LT |
2806 | return -EINVAL; |
2807 | if (udev->state == USB_STATE_ADDRESS) | |
2808 | return 0; | |
2809 | if (udev->state != USB_STATE_DEFAULT) | |
2810 | return -EINVAL; | |
c8d4af8e | 2811 | if (hcd->driver->address_device) |
c6515272 | 2812 | retval = hcd->driver->address_device(hcd, udev); |
c8d4af8e | 2813 | else |
c6515272 SS |
2814 | retval = usb_control_msg(udev, usb_sndaddr0pipe(), |
2815 | USB_REQ_SET_ADDRESS, 0, devnum, 0, | |
2816 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
1da177e4 | 2817 | if (retval == 0) { |
3b29b68b | 2818 | update_devnum(udev, devnum); |
4953d141 | 2819 | /* Device now using proper address. */ |
1da177e4 | 2820 | usb_set_device_state(udev, USB_STATE_ADDRESS); |
fc721f51 | 2821 | usb_ep0_reinit(udev); |
1da177e4 LT |
2822 | } |
2823 | return retval; | |
2824 | } | |
2825 | ||
2826 | /* Reset device, (re)assign address, get device descriptor. | |
2827 | * Device connection must be stable, no more debouncing needed. | |
2828 | * Returns device in USB_STATE_ADDRESS, except on error. | |
2829 | * | |
2830 | * If this is called for an already-existing device (as part of | |
742120c6 | 2831 | * usb_reset_and_verify_device), the caller must own the device lock. For a |
1da177e4 LT |
2832 | * newly detected device that is not accessible through any global |
2833 | * pointers, it's not necessary to lock the device. | |
2834 | */ | |
2835 | static int | |
2836 | hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, | |
2837 | int retry_counter) | |
2838 | { | |
4186ecf8 | 2839 | static DEFINE_MUTEX(usb_address0_mutex); |
1da177e4 LT |
2840 | |
2841 | struct usb_device *hdev = hub->hdev; | |
e7b77172 | 2842 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
1da177e4 LT |
2843 | int i, j, retval; |
2844 | unsigned delay = HUB_SHORT_RESET_TIME; | |
2845 | enum usb_device_speed oldspeed = udev->speed; | |
e538dfda | 2846 | const char *speed; |
4326ed0b | 2847 | int devnum = udev->devnum; |
1da177e4 LT |
2848 | |
2849 | /* root hub ports have a slightly longer reset period | |
2850 | * (from USB 2.0 spec, section 7.1.7.5) | |
2851 | */ | |
2852 | if (!hdev->parent) { | |
2853 | delay = HUB_ROOT_RESET_TIME; | |
2854 | if (port1 == hdev->bus->otg_port) | |
2855 | hdev->bus->b_hnp_enable = 0; | |
2856 | } | |
2857 | ||
2858 | /* Some low speed devices have problems with the quick delay, so */ | |
2859 | /* be a bit pessimistic with those devices. RHbug #23670 */ | |
2860 | if (oldspeed == USB_SPEED_LOW) | |
2861 | delay = HUB_LONG_RESET_TIME; | |
2862 | ||
4186ecf8 | 2863 | mutex_lock(&usb_address0_mutex); |
1da177e4 | 2864 | |
07194ab7 LT |
2865 | /* Reset the device; full speed may morph to high speed */ |
2866 | /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ | |
75d7cf72 | 2867 | retval = hub_port_reset(hub, port1, udev, delay, false); |
07194ab7 LT |
2868 | if (retval < 0) /* error or disconnect */ |
2869 | goto fail; | |
2870 | /* success, speed is known */ | |
2871 | ||
1da177e4 LT |
2872 | retval = -ENODEV; |
2873 | ||
2874 | if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { | |
2875 | dev_dbg(&udev->dev, "device reset changed speed!\n"); | |
2876 | goto fail; | |
2877 | } | |
2878 | oldspeed = udev->speed; | |
4326ed0b | 2879 | |
1da177e4 LT |
2880 | /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... |
2881 | * it's fixed size except for full speed devices. | |
5bb6e0ae IPG |
2882 | * For Wireless USB devices, ep0 max packet is always 512 (tho |
2883 | * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. | |
1da177e4 LT |
2884 | */ |
2885 | switch (udev->speed) { | |
6b403b02 | 2886 | case USB_SPEED_SUPER: |
551cdbbe | 2887 | case USB_SPEED_WIRELESS: /* fixed at 512 */ |
551509d2 | 2888 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); |
5bb6e0ae | 2889 | break; |
1da177e4 | 2890 | case USB_SPEED_HIGH: /* fixed at 64 */ |
551509d2 | 2891 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
2892 | break; |
2893 | case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ | |
2894 | /* to determine the ep0 maxpacket size, try to read | |
2895 | * the device descriptor to get bMaxPacketSize0 and | |
2896 | * then correct our initial guess. | |
2897 | */ | |
551509d2 | 2898 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
2899 | break; |
2900 | case USB_SPEED_LOW: /* fixed at 8 */ | |
551509d2 | 2901 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); |
1da177e4 LT |
2902 | break; |
2903 | default: | |
2904 | goto fail; | |
2905 | } | |
e538dfda MN |
2906 | |
2907 | if (udev->speed == USB_SPEED_WIRELESS) | |
2908 | speed = "variable speed Wireless"; | |
2909 | else | |
2910 | speed = usb_speed_string(udev->speed); | |
2911 | ||
c6515272 SS |
2912 | if (udev->speed != USB_SPEED_SUPER) |
2913 | dev_info(&udev->dev, | |
e538dfda MN |
2914 | "%s %s USB device number %d using %s\n", |
2915 | (udev->config) ? "reset" : "new", speed, | |
3b29b68b | 2916 | devnum, udev->bus->controller->driver->name); |
1da177e4 LT |
2917 | |
2918 | /* Set up TT records, if needed */ | |
2919 | if (hdev->tt) { | |
2920 | udev->tt = hdev->tt; | |
2921 | udev->ttport = hdev->ttport; | |
2922 | } else if (udev->speed != USB_SPEED_HIGH | |
2923 | && hdev->speed == USB_SPEED_HIGH) { | |
d199c96d AS |
2924 | if (!hub->tt.hub) { |
2925 | dev_err(&udev->dev, "parent hub has no TT\n"); | |
2926 | retval = -EINVAL; | |
2927 | goto fail; | |
2928 | } | |
1da177e4 LT |
2929 | udev->tt = &hub->tt; |
2930 | udev->ttport = port1; | |
2931 | } | |
2932 | ||
2933 | /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? | |
2934 | * Because device hardware and firmware is sometimes buggy in | |
2935 | * this area, and this is how Linux has done it for ages. | |
2936 | * Change it cautiously. | |
2937 | * | |
2938 | * NOTE: If USE_NEW_SCHEME() is true we will start by issuing | |
2939 | * a 64-byte GET_DESCRIPTOR request. This is what Windows does, | |
2940 | * so it may help with some non-standards-compliant devices. | |
2941 | * Otherwise we start with SET_ADDRESS and then try to read the | |
2942 | * first 8 bytes of the device descriptor to get the ep0 maxpacket | |
2943 | * value. | |
2944 | */ | |
2945 | for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { | |
c6515272 | 2946 | if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) { |
1da177e4 LT |
2947 | struct usb_device_descriptor *buf; |
2948 | int r = 0; | |
2949 | ||
2950 | #define GET_DESCRIPTOR_BUFSIZE 64 | |
2951 | buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); | |
2952 | if (!buf) { | |
2953 | retval = -ENOMEM; | |
2954 | continue; | |
2955 | } | |
2956 | ||
b89ee19a AS |
2957 | /* Retry on all errors; some devices are flakey. |
2958 | * 255 is for WUSB devices, we actually need to use | |
2959 | * 512 (WUSB1.0[4.8.1]). | |
1da177e4 LT |
2960 | */ |
2961 | for (j = 0; j < 3; ++j) { | |
2962 | buf->bMaxPacketSize0 = 0; | |
2963 | r = usb_control_msg(udev, usb_rcvaddr0pipe(), | |
2964 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, | |
2965 | USB_DT_DEVICE << 8, 0, | |
2966 | buf, GET_DESCRIPTOR_BUFSIZE, | |
fd7c519d | 2967 | initial_descriptor_timeout); |
1da177e4 | 2968 | switch (buf->bMaxPacketSize0) { |
5bb6e0ae | 2969 | case 8: case 16: case 32: case 64: case 255: |
1da177e4 LT |
2970 | if (buf->bDescriptorType == |
2971 | USB_DT_DEVICE) { | |
2972 | r = 0; | |
2973 | break; | |
2974 | } | |
2975 | /* FALL THROUGH */ | |
2976 | default: | |
2977 | if (r == 0) | |
2978 | r = -EPROTO; | |
2979 | break; | |
2980 | } | |
2981 | if (r == 0) | |
2982 | break; | |
2983 | } | |
2984 | udev->descriptor.bMaxPacketSize0 = | |
2985 | buf->bMaxPacketSize0; | |
2986 | kfree(buf); | |
2987 | ||
75d7cf72 | 2988 | retval = hub_port_reset(hub, port1, udev, delay, false); |
1da177e4 LT |
2989 | if (retval < 0) /* error or disconnect */ |
2990 | goto fail; | |
2991 | if (oldspeed != udev->speed) { | |
2992 | dev_dbg(&udev->dev, | |
2993 | "device reset changed speed!\n"); | |
2994 | retval = -ENODEV; | |
2995 | goto fail; | |
2996 | } | |
2997 | if (r) { | |
b9cef6c3 WF |
2998 | dev_err(&udev->dev, |
2999 | "device descriptor read/64, error %d\n", | |
3000 | r); | |
1da177e4 LT |
3001 | retval = -EMSGSIZE; |
3002 | continue; | |
3003 | } | |
3004 | #undef GET_DESCRIPTOR_BUFSIZE | |
3005 | } | |
3006 | ||
6c529cdc IPG |
3007 | /* |
3008 | * If device is WUSB, we already assigned an | |
3009 | * unauthorized address in the Connect Ack sequence; | |
3010 | * authorization will assign the final address. | |
3011 | */ | |
c6515272 | 3012 | if (udev->wusb == 0) { |
6c529cdc IPG |
3013 | for (j = 0; j < SET_ADDRESS_TRIES; ++j) { |
3014 | retval = hub_set_address(udev, devnum); | |
3015 | if (retval >= 0) | |
3016 | break; | |
3017 | msleep(200); | |
3018 | } | |
3019 | if (retval < 0) { | |
3020 | dev_err(&udev->dev, | |
3021 | "device not accepting address %d, error %d\n", | |
3022 | devnum, retval); | |
3023 | goto fail; | |
3024 | } | |
c6515272 SS |
3025 | if (udev->speed == USB_SPEED_SUPER) { |
3026 | devnum = udev->devnum; | |
3027 | dev_info(&udev->dev, | |
3b29b68b | 3028 | "%s SuperSpeed USB device number %d using %s\n", |
c6515272 | 3029 | (udev->config) ? "reset" : "new", |
3b29b68b | 3030 | devnum, udev->bus->controller->driver->name); |
c6515272 | 3031 | } |
6c529cdc IPG |
3032 | |
3033 | /* cope with hardware quirkiness: | |
3034 | * - let SET_ADDRESS settle, some device hardware wants it | |
3035 | * - read ep0 maxpacket even for high and low speed, | |
3036 | */ | |
3037 | msleep(10); | |
c6515272 | 3038 | if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) |
1da177e4 | 3039 | break; |
6c529cdc | 3040 | } |
1da177e4 LT |
3041 | |
3042 | retval = usb_get_device_descriptor(udev, 8); | |
3043 | if (retval < 8) { | |
b9cef6c3 WF |
3044 | dev_err(&udev->dev, |
3045 | "device descriptor read/8, error %d\n", | |
3046 | retval); | |
1da177e4 LT |
3047 | if (retval >= 0) |
3048 | retval = -EMSGSIZE; | |
3049 | } else { | |
3050 | retval = 0; | |
3051 | break; | |
3052 | } | |
3053 | } | |
3054 | if (retval) | |
3055 | goto fail; | |
3056 | ||
6b403b02 SS |
3057 | if (udev->descriptor.bMaxPacketSize0 == 0xff || |
3058 | udev->speed == USB_SPEED_SUPER) | |
3059 | i = 512; | |
3060 | else | |
3061 | i = udev->descriptor.bMaxPacketSize0; | |
29cc8897 | 3062 | if (usb_endpoint_maxp(&udev->ep0.desc) != i) { |
56626a72 | 3063 | if (udev->speed == USB_SPEED_LOW || |
1da177e4 | 3064 | !(i == 8 || i == 16 || i == 32 || i == 64)) { |
56626a72 | 3065 | dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); |
1da177e4 LT |
3066 | retval = -EMSGSIZE; |
3067 | goto fail; | |
3068 | } | |
56626a72 AS |
3069 | if (udev->speed == USB_SPEED_FULL) |
3070 | dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); | |
3071 | else | |
3072 | dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); | |
1da177e4 | 3073 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); |
fc721f51 | 3074 | usb_ep0_reinit(udev); |
1da177e4 LT |
3075 | } |
3076 | ||
3077 | retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); | |
3078 | if (retval < (signed)sizeof(udev->descriptor)) { | |
b9cef6c3 WF |
3079 | dev_err(&udev->dev, "device descriptor read/all, error %d\n", |
3080 | retval); | |
1da177e4 LT |
3081 | if (retval >= 0) |
3082 | retval = -ENOMSG; | |
3083 | goto fail; | |
3084 | } | |
3085 | ||
1ff4df56 AX |
3086 | if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { |
3087 | retval = usb_get_bos_descriptor(udev); | |
3088 | if (!retval) { | |
3089 | if (udev->bos->ext_cap && (USB_LPM_SUPPORT & | |
3090 | le32_to_cpu(udev->bos->ext_cap->bmAttributes))) | |
3091 | udev->lpm_capable = 1; | |
3092 | } | |
3093 | } | |
3148bf04 | 3094 | |
1da177e4 | 3095 | retval = 0; |
48f24970 AD |
3096 | /* notify HCD that we have a device connected and addressed */ |
3097 | if (hcd->driver->update_device) | |
3098 | hcd->driver->update_device(hcd, udev); | |
1da177e4 | 3099 | fail: |
4326ed0b | 3100 | if (retval) { |
1da177e4 | 3101 | hub_port_disable(hub, port1, 0); |
3b29b68b | 3102 | update_devnum(udev, devnum); /* for disconnect processing */ |
4326ed0b | 3103 | } |
4186ecf8 | 3104 | mutex_unlock(&usb_address0_mutex); |
1da177e4 LT |
3105 | return retval; |
3106 | } | |
3107 | ||
3108 | static void | |
3109 | check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) | |
3110 | { | |
3111 | struct usb_qualifier_descriptor *qual; | |
3112 | int status; | |
3113 | ||
e94b1766 | 3114 | qual = kmalloc (sizeof *qual, GFP_KERNEL); |
1da177e4 LT |
3115 | if (qual == NULL) |
3116 | return; | |
3117 | ||
3118 | status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, | |
3119 | qual, sizeof *qual); | |
3120 | if (status == sizeof *qual) { | |
3121 | dev_info(&udev->dev, "not running at top speed; " | |
3122 | "connect to a high speed hub\n"); | |
3123 | /* hub LEDs are probably harder to miss than syslog */ | |
3124 | if (hub->has_indicators) { | |
3125 | hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; | |
c4028958 | 3126 | schedule_delayed_work (&hub->leds, 0); |
1da177e4 LT |
3127 | } |
3128 | } | |
1bc3c9e1 | 3129 | kfree(qual); |
1da177e4 LT |
3130 | } |
3131 | ||
3132 | static unsigned | |
3133 | hub_power_remaining (struct usb_hub *hub) | |
3134 | { | |
3135 | struct usb_device *hdev = hub->hdev; | |
3136 | int remaining; | |
55c52718 | 3137 | int port1; |
1da177e4 | 3138 | |
55c52718 | 3139 | if (!hub->limited_power) |
1da177e4 LT |
3140 | return 0; |
3141 | ||
55c52718 AS |
3142 | remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; |
3143 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
3144 | struct usb_device *udev = hdev->children[port1 - 1]; | |
3145 | int delta; | |
1da177e4 LT |
3146 | |
3147 | if (!udev) | |
3148 | continue; | |
3149 | ||
55c52718 AS |
3150 | /* Unconfigured devices may not use more than 100mA, |
3151 | * or 8mA for OTG ports */ | |
1da177e4 | 3152 | if (udev->actconfig) |
55c52718 AS |
3153 | delta = udev->actconfig->desc.bMaxPower * 2; |
3154 | else if (port1 != udev->bus->otg_port || hdev->parent) | |
3155 | delta = 100; | |
1da177e4 | 3156 | else |
55c52718 AS |
3157 | delta = 8; |
3158 | if (delta > hub->mA_per_port) | |
b9cef6c3 WF |
3159 | dev_warn(&udev->dev, |
3160 | "%dmA is over %umA budget for port %d!\n", | |
3161 | delta, hub->mA_per_port, port1); | |
1da177e4 LT |
3162 | remaining -= delta; |
3163 | } | |
3164 | if (remaining < 0) { | |
55c52718 AS |
3165 | dev_warn(hub->intfdev, "%dmA over power budget!\n", |
3166 | - remaining); | |
1da177e4 LT |
3167 | remaining = 0; |
3168 | } | |
3169 | return remaining; | |
3170 | } | |
3171 | ||
3172 | /* Handle physical or logical connection change events. | |
3173 | * This routine is called when: | |
3174 | * a port connection-change occurs; | |
3175 | * a port enable-change occurs (often caused by EMI); | |
742120c6 | 3176 | * usb_reset_and_verify_device() encounters changed descriptors (as from |
1da177e4 LT |
3177 | * a firmware download) |
3178 | * caller already locked the hub | |
3179 | */ | |
3180 | static void hub_port_connect_change(struct usb_hub *hub, int port1, | |
3181 | u16 portstatus, u16 portchange) | |
3182 | { | |
3183 | struct usb_device *hdev = hub->hdev; | |
3184 | struct device *hub_dev = hub->intfdev; | |
90da096e | 3185 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
24618b0c AS |
3186 | unsigned wHubCharacteristics = |
3187 | le16_to_cpu(hub->descriptor->wHubCharacteristics); | |
8808f00c | 3188 | struct usb_device *udev; |
1da177e4 | 3189 | int status, i; |
24618b0c | 3190 | |
1da177e4 LT |
3191 | dev_dbg (hub_dev, |
3192 | "port %d, status %04x, change %04x, %s\n", | |
131dec34 | 3193 | port1, portstatus, portchange, portspeed(hub, portstatus)); |
1da177e4 LT |
3194 | |
3195 | if (hub->has_indicators) { | |
3196 | set_port_led(hub, port1, HUB_LED_AUTO); | |
3197 | hub->indicator[port1-1] = INDICATOR_AUTO; | |
3198 | } | |
1da177e4 LT |
3199 | |
3200 | #ifdef CONFIG_USB_OTG | |
3201 | /* during HNP, don't repeat the debounce */ | |
3202 | if (hdev->bus->is_b_host) | |
24618b0c AS |
3203 | portchange &= ~(USB_PORT_STAT_C_CONNECTION | |
3204 | USB_PORT_STAT_C_ENABLE); | |
1da177e4 LT |
3205 | #endif |
3206 | ||
8808f00c AS |
3207 | /* Try to resuscitate an existing device */ |
3208 | udev = hdev->children[port1-1]; | |
3209 | if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && | |
3210 | udev->state != USB_STATE_NOTATTACHED) { | |
8808f00c AS |
3211 | usb_lock_device(udev); |
3212 | if (portstatus & USB_PORT_STAT_ENABLE) { | |
3213 | status = 0; /* Nothing to do */ | |
8808f00c AS |
3214 | |
3215 | #ifdef CONFIG_USB_SUSPEND | |
5257d97a AS |
3216 | } else if (udev->state == USB_STATE_SUSPENDED && |
3217 | udev->persist_enabled) { | |
8808f00c AS |
3218 | /* For a suspended device, treat this as a |
3219 | * remote wakeup event. | |
3220 | */ | |
0534d468 | 3221 | status = usb_remote_wakeup(udev); |
8808f00c AS |
3222 | #endif |
3223 | ||
3224 | } else { | |
5257d97a | 3225 | status = -ENODEV; /* Don't resuscitate */ |
8808f00c AS |
3226 | } |
3227 | usb_unlock_device(udev); | |
3228 | ||
3229 | if (status == 0) { | |
3230 | clear_bit(port1, hub->change_bits); | |
3231 | return; | |
3232 | } | |
3233 | } | |
3234 | ||
24618b0c | 3235 | /* Disconnect any existing devices under this port */ |
8808f00c | 3236 | if (udev) |
24618b0c AS |
3237 | usb_disconnect(&hdev->children[port1-1]); |
3238 | clear_bit(port1, hub->change_bits); | |
3239 | ||
253e0572 AS |
3240 | /* We can forget about a "removed" device when there's a physical |
3241 | * disconnect or the connect status changes. | |
3242 | */ | |
3243 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
3244 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
3245 | clear_bit(port1, hub->removed_bits); | |
3246 | ||
5257d97a AS |
3247 | if (portchange & (USB_PORT_STAT_C_CONNECTION | |
3248 | USB_PORT_STAT_C_ENABLE)) { | |
3249 | status = hub_port_debounce(hub, port1); | |
3250 | if (status < 0) { | |
3251 | if (printk_ratelimit()) | |
3252 | dev_err(hub_dev, "connect-debounce failed, " | |
3253 | "port %d disabled\n", port1); | |
3254 | portstatus &= ~USB_PORT_STAT_CONNECTION; | |
3255 | } else { | |
3256 | portstatus = status; | |
3257 | } | |
3258 | } | |
3259 | ||
253e0572 AS |
3260 | /* Return now if debouncing failed or nothing is connected or |
3261 | * the device was "removed". | |
3262 | */ | |
3263 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
3264 | test_bit(port1, hub->removed_bits)) { | |
1da177e4 LT |
3265 | |
3266 | /* maybe switch power back on (e.g. root hub was reset) */ | |
74ad9bd2 | 3267 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 |
0ed9a57e | 3268 | && !port_is_power_on(hub, portstatus)) |
1da177e4 | 3269 | set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
5257d97a | 3270 | |
1da177e4 LT |
3271 | if (portstatus & USB_PORT_STAT_ENABLE) |
3272 | goto done; | |
3273 | return; | |
3274 | } | |
3275 | ||
1da177e4 | 3276 | for (i = 0; i < SET_CONFIG_TRIES; i++) { |
1da177e4 LT |
3277 | |
3278 | /* reallocate for each attempt, since references | |
3279 | * to the previous one can escape in various ways | |
3280 | */ | |
3281 | udev = usb_alloc_dev(hdev, hdev->bus, port1); | |
3282 | if (!udev) { | |
3283 | dev_err (hub_dev, | |
3284 | "couldn't allocate port %d usb_device\n", | |
3285 | port1); | |
3286 | goto done; | |
3287 | } | |
3288 | ||
3289 | usb_set_device_state(udev, USB_STATE_POWERED); | |
55c52718 | 3290 | udev->bus_mA = hub->mA_per_port; |
b6956ffa | 3291 | udev->level = hdev->level + 1; |
8af548dc | 3292 | udev->wusb = hub_is_wusb(hub); |
55c52718 | 3293 | |
131dec34 SS |
3294 | /* Only USB 3.0 devices are connected to SuperSpeed hubs. */ |
3295 | if (hub_is_superspeed(hub->hdev)) | |
e7b77172 SS |
3296 | udev->speed = USB_SPEED_SUPER; |
3297 | else | |
3298 | udev->speed = USB_SPEED_UNKNOWN; | |
3299 | ||
3b29b68b | 3300 | choose_devnum(udev); |
c8d4af8e AX |
3301 | if (udev->devnum <= 0) { |
3302 | status = -ENOTCONN; /* Don't retry */ | |
3303 | goto loop; | |
c6515272 SS |
3304 | } |
3305 | ||
e7b77172 | 3306 | /* reset (non-USB 3.0 devices) and get descriptor */ |
1da177e4 LT |
3307 | status = hub_port_init(hub, udev, port1, i); |
3308 | if (status < 0) | |
3309 | goto loop; | |
3310 | ||
93362a87 PD |
3311 | usb_detect_quirks(udev); |
3312 | if (udev->quirks & USB_QUIRK_DELAY_INIT) | |
3313 | msleep(1000); | |
3314 | ||
1da177e4 LT |
3315 | /* consecutive bus-powered hubs aren't reliable; they can |
3316 | * violate the voltage drop budget. if the new child has | |
3317 | * a "powered" LED, users should notice we didn't enable it | |
3318 | * (without reading syslog), even without per-port LEDs | |
3319 | * on the parent. | |
3320 | */ | |
3321 | if (udev->descriptor.bDeviceClass == USB_CLASS_HUB | |
55c52718 | 3322 | && udev->bus_mA <= 100) { |
1da177e4 LT |
3323 | u16 devstat; |
3324 | ||
3325 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, | |
3326 | &devstat); | |
55c52718 | 3327 | if (status < 2) { |
1da177e4 LT |
3328 | dev_dbg(&udev->dev, "get status %d ?\n", status); |
3329 | goto loop_disable; | |
3330 | } | |
55c52718 | 3331 | le16_to_cpus(&devstat); |
1da177e4 LT |
3332 | if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
3333 | dev_err(&udev->dev, | |
3334 | "can't connect bus-powered hub " | |
3335 | "to this port\n"); | |
3336 | if (hub->has_indicators) { | |
3337 | hub->indicator[port1-1] = | |
3338 | INDICATOR_AMBER_BLINK; | |
c4028958 | 3339 | schedule_delayed_work (&hub->leds, 0); |
1da177e4 LT |
3340 | } |
3341 | status = -ENOTCONN; /* Don't retry */ | |
3342 | goto loop_disable; | |
3343 | } | |
3344 | } | |
3345 | ||
3346 | /* check for devices running slower than they could */ | |
3347 | if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 | |
3348 | && udev->speed == USB_SPEED_FULL | |
3349 | && highspeed_hubs != 0) | |
3350 | check_highspeed (hub, udev, port1); | |
3351 | ||
3352 | /* Store the parent's children[] pointer. At this point | |
3353 | * udev becomes globally accessible, although presumably | |
3354 | * no one will look at it until hdev is unlocked. | |
3355 | */ | |
1da177e4 LT |
3356 | status = 0; |
3357 | ||
3358 | /* We mustn't add new devices if the parent hub has | |
3359 | * been disconnected; we would race with the | |
3360 | * recursively_mark_NOTATTACHED() routine. | |
3361 | */ | |
3362 | spin_lock_irq(&device_state_lock); | |
3363 | if (hdev->state == USB_STATE_NOTATTACHED) | |
3364 | status = -ENOTCONN; | |
3365 | else | |
3366 | hdev->children[port1-1] = udev; | |
3367 | spin_unlock_irq(&device_state_lock); | |
3368 | ||
3369 | /* Run it through the hoops (find a driver, etc) */ | |
3370 | if (!status) { | |
3371 | status = usb_new_device(udev); | |
3372 | if (status) { | |
3373 | spin_lock_irq(&device_state_lock); | |
3374 | hdev->children[port1-1] = NULL; | |
3375 | spin_unlock_irq(&device_state_lock); | |
3376 | } | |
3377 | } | |
3378 | ||
1da177e4 LT |
3379 | if (status) |
3380 | goto loop_disable; | |
3381 | ||
3382 | status = hub_power_remaining(hub); | |
3383 | if (status) | |
55c52718 | 3384 | dev_dbg(hub_dev, "%dmA power budget left\n", status); |
1da177e4 LT |
3385 | |
3386 | return; | |
3387 | ||
3388 | loop_disable: | |
3389 | hub_port_disable(hub, port1, 1); | |
3390 | loop: | |
fc721f51 | 3391 | usb_ep0_reinit(udev); |
3b29b68b | 3392 | release_devnum(udev); |
f7410ced | 3393 | hub_free_dev(udev); |
1da177e4 | 3394 | usb_put_dev(udev); |
ffcdc18d | 3395 | if ((status == -ENOTCONN) || (status == -ENOTSUPP)) |
1da177e4 LT |
3396 | break; |
3397 | } | |
3a31155c AS |
3398 | if (hub->hdev->parent || |
3399 | !hcd->driver->port_handed_over || | |
3400 | !(hcd->driver->port_handed_over)(hcd, port1)) | |
3401 | dev_err(hub_dev, "unable to enumerate USB device on port %d\n", | |
3402 | port1); | |
1da177e4 LT |
3403 | |
3404 | done: | |
3405 | hub_port_disable(hub, port1, 1); | |
90da096e BR |
3406 | if (hcd->driver->relinquish_port && !hub->hdev->parent) |
3407 | hcd->driver->relinquish_port(hcd, port1); | |
1da177e4 LT |
3408 | } |
3409 | ||
3410 | static void hub_events(void) | |
3411 | { | |
3412 | struct list_head *tmp; | |
3413 | struct usb_device *hdev; | |
3414 | struct usb_interface *intf; | |
3415 | struct usb_hub *hub; | |
3416 | struct device *hub_dev; | |
3417 | u16 hubstatus; | |
3418 | u16 hubchange; | |
3419 | u16 portstatus; | |
3420 | u16 portchange; | |
3421 | int i, ret; | |
3422 | int connect_change; | |
3423 | ||
3424 | /* | |
3425 | * We restart the list every time to avoid a deadlock with | |
3426 | * deleting hubs downstream from this one. This should be | |
3427 | * safe since we delete the hub from the event list. | |
3428 | * Not the most efficient, but avoids deadlocks. | |
3429 | */ | |
3430 | while (1) { | |
3431 | ||
3432 | /* Grab the first entry at the beginning of the list */ | |
3433 | spin_lock_irq(&hub_event_lock); | |
3434 | if (list_empty(&hub_event_list)) { | |
3435 | spin_unlock_irq(&hub_event_lock); | |
3436 | break; | |
3437 | } | |
3438 | ||
3439 | tmp = hub_event_list.next; | |
3440 | list_del_init(tmp); | |
3441 | ||
3442 | hub = list_entry(tmp, struct usb_hub, event_list); | |
e8054854 AS |
3443 | kref_get(&hub->kref); |
3444 | spin_unlock_irq(&hub_event_lock); | |
1da177e4 | 3445 | |
e8054854 AS |
3446 | hdev = hub->hdev; |
3447 | hub_dev = hub->intfdev; | |
3448 | intf = to_usb_interface(hub_dev); | |
40f122f3 | 3449 | dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", |
1da177e4 LT |
3450 | hdev->state, hub->descriptor |
3451 | ? hub->descriptor->bNbrPorts | |
3452 | : 0, | |
3453 | /* NOTE: expects max 15 ports... */ | |
3454 | (u16) hub->change_bits[0], | |
40f122f3 | 3455 | (u16) hub->event_bits[0]); |
1da177e4 | 3456 | |
1da177e4 LT |
3457 | /* Lock the device, then check to see if we were |
3458 | * disconnected while waiting for the lock to succeed. */ | |
06b84e8a | 3459 | usb_lock_device(hdev); |
e8054854 | 3460 | if (unlikely(hub->disconnected)) |
9bbdf1e0 | 3461 | goto loop_disconnected; |
1da177e4 LT |
3462 | |
3463 | /* If the hub has died, clean up after it */ | |
3464 | if (hdev->state == USB_STATE_NOTATTACHED) { | |
7de18d8b | 3465 | hub->error = -ENODEV; |
4330354f | 3466 | hub_quiesce(hub, HUB_DISCONNECT); |
1da177e4 LT |
3467 | goto loop; |
3468 | } | |
3469 | ||
40f122f3 AS |
3470 | /* Autoresume */ |
3471 | ret = usb_autopm_get_interface(intf); | |
3472 | if (ret) { | |
3473 | dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); | |
3474 | goto loop; | |
3475 | } | |
a8e7c565 | 3476 | |
40f122f3 | 3477 | /* If this is an inactive hub, do nothing */ |
1da177e4 | 3478 | if (hub->quiescing) |
40f122f3 | 3479 | goto loop_autopm; |
1da177e4 LT |
3480 | |
3481 | if (hub->error) { | |
3482 | dev_dbg (hub_dev, "resetting for error %d\n", | |
3483 | hub->error); | |
3484 | ||
742120c6 | 3485 | ret = usb_reset_device(hdev); |
1da177e4 LT |
3486 | if (ret) { |
3487 | dev_dbg (hub_dev, | |
3488 | "error resetting hub: %d\n", ret); | |
40f122f3 | 3489 | goto loop_autopm; |
1da177e4 LT |
3490 | } |
3491 | ||
3492 | hub->nerrors = 0; | |
3493 | hub->error = 0; | |
3494 | } | |
3495 | ||
3496 | /* deal with port status changes */ | |
3497 | for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { | |
3498 | if (test_bit(i, hub->busy_bits)) | |
3499 | continue; | |
3500 | connect_change = test_bit(i, hub->change_bits); | |
3501 | if (!test_and_clear_bit(i, hub->event_bits) && | |
6ee0b270 | 3502 | !connect_change) |
1da177e4 LT |
3503 | continue; |
3504 | ||
3505 | ret = hub_port_status(hub, i, | |
3506 | &portstatus, &portchange); | |
3507 | if (ret < 0) | |
3508 | continue; | |
3509 | ||
1da177e4 LT |
3510 | if (portchange & USB_PORT_STAT_C_CONNECTION) { |
3511 | clear_port_feature(hdev, i, | |
3512 | USB_PORT_FEAT_C_CONNECTION); | |
3513 | connect_change = 1; | |
3514 | } | |
3515 | ||
3516 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
3517 | if (!connect_change) | |
3518 | dev_dbg (hub_dev, | |
3519 | "port %d enable change, " | |
3520 | "status %08x\n", | |
3521 | i, portstatus); | |
3522 | clear_port_feature(hdev, i, | |
3523 | USB_PORT_FEAT_C_ENABLE); | |
3524 | ||
3525 | /* | |
3526 | * EM interference sometimes causes badly | |
3527 | * shielded USB devices to be shutdown by | |
3528 | * the hub, this hack enables them again. | |
3529 | * Works at least with mouse driver. | |
3530 | */ | |
3531 | if (!(portstatus & USB_PORT_STAT_ENABLE) | |
3532 | && !connect_change | |
3533 | && hdev->children[i-1]) { | |
3534 | dev_err (hub_dev, | |
3535 | "port %i " | |
3536 | "disabled by hub (EMI?), " | |
3537 | "re-enabling...\n", | |
3538 | i); | |
3539 | connect_change = 1; | |
3540 | } | |
3541 | } | |
3542 | ||
3543 | if (portchange & USB_PORT_STAT_C_SUSPEND) { | |
8808f00c AS |
3544 | struct usb_device *udev; |
3545 | ||
1da177e4 LT |
3546 | clear_port_feature(hdev, i, |
3547 | USB_PORT_FEAT_C_SUSPEND); | |
8808f00c AS |
3548 | udev = hdev->children[i-1]; |
3549 | if (udev) { | |
49d0f078 AS |
3550 | /* TRSMRCY = 10 msec */ |
3551 | msleep(10); | |
3552 | ||
8808f00c | 3553 | usb_lock_device(udev); |
0534d468 | 3554 | ret = usb_remote_wakeup(hdev-> |
1da177e4 | 3555 | children[i-1]); |
8808f00c | 3556 | usb_unlock_device(udev); |
1da177e4 LT |
3557 | if (ret < 0) |
3558 | connect_change = 1; | |
3559 | } else { | |
3560 | ret = -ENODEV; | |
3561 | hub_port_disable(hub, i, 1); | |
3562 | } | |
3563 | dev_dbg (hub_dev, | |
3564 | "resume on port %d, status %d\n", | |
3565 | i, ret); | |
3566 | } | |
3567 | ||
3568 | if (portchange & USB_PORT_STAT_C_OVERCURRENT) { | |
752d57a8 PB |
3569 | u16 status = 0; |
3570 | u16 unused; | |
3571 | ||
3572 | dev_dbg(hub_dev, "over-current change on port " | |
3573 | "%d\n", i); | |
1da177e4 LT |
3574 | clear_port_feature(hdev, i, |
3575 | USB_PORT_FEAT_C_OVER_CURRENT); | |
752d57a8 | 3576 | msleep(100); /* Cool down */ |
8520f380 | 3577 | hub_power_on(hub, true); |
752d57a8 PB |
3578 | hub_port_status(hub, i, &status, &unused); |
3579 | if (status & USB_PORT_STAT_OVERCURRENT) | |
3580 | dev_err(hub_dev, "over-current " | |
3581 | "condition on port %d\n", i); | |
1da177e4 LT |
3582 | } |
3583 | ||
3584 | if (portchange & USB_PORT_STAT_C_RESET) { | |
3585 | dev_dbg (hub_dev, | |
3586 | "reset change on port %d\n", | |
3587 | i); | |
3588 | clear_port_feature(hdev, i, | |
3589 | USB_PORT_FEAT_C_RESET); | |
3590 | } | |
c7061574 SS |
3591 | if ((portchange & USB_PORT_STAT_C_BH_RESET) && |
3592 | hub_is_superspeed(hub->hdev)) { | |
3593 | dev_dbg(hub_dev, | |
3594 | "warm reset change on port %d\n", | |
3595 | i); | |
3596 | clear_port_feature(hdev, i, | |
3597 | USB_PORT_FEAT_C_BH_PORT_RESET); | |
3598 | } | |
dbe79bbe JY |
3599 | if (portchange & USB_PORT_STAT_C_LINK_STATE) { |
3600 | clear_port_feature(hub->hdev, i, | |
3601 | USB_PORT_FEAT_C_PORT_LINK_STATE); | |
3602 | } | |
3603 | if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { | |
3604 | dev_warn(hub_dev, | |
3605 | "config error on port %d\n", | |
3606 | i); | |
3607 | clear_port_feature(hub->hdev, i, | |
3608 | USB_PORT_FEAT_C_PORT_CONFIG_ERROR); | |
3609 | } | |
1da177e4 | 3610 | |
5e467f6e AX |
3611 | /* Warm reset a USB3 protocol port if it's in |
3612 | * SS.Inactive state. | |
3613 | */ | |
3614 | if (hub_is_superspeed(hub->hdev) && | |
3615 | (portstatus & USB_PORT_STAT_LINK_STATE) | |
3616 | == USB_SS_PORT_LS_SS_INACTIVE) { | |
3617 | dev_dbg(hub_dev, "warm reset port %d\n", i); | |
75d7cf72 AX |
3618 | hub_port_reset(hub, i, NULL, |
3619 | HUB_BH_RESET_TIME, true); | |
5e467f6e AX |
3620 | } |
3621 | ||
1da177e4 LT |
3622 | if (connect_change) |
3623 | hub_port_connect_change(hub, i, | |
3624 | portstatus, portchange); | |
3625 | } /* end for i */ | |
3626 | ||
3627 | /* deal with hub status changes */ | |
3628 | if (test_and_clear_bit(0, hub->event_bits) == 0) | |
3629 | ; /* do nothing */ | |
3630 | else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) | |
3631 | dev_err (hub_dev, "get_hub_status failed\n"); | |
3632 | else { | |
3633 | if (hubchange & HUB_CHANGE_LOCAL_POWER) { | |
3634 | dev_dbg (hub_dev, "power change\n"); | |
3635 | clear_hub_feature(hdev, C_HUB_LOCAL_POWER); | |
55c52718 AS |
3636 | if (hubstatus & HUB_STATUS_LOCAL_POWER) |
3637 | /* FIXME: Is this always true? */ | |
55c52718 | 3638 | hub->limited_power = 1; |
403fae78 | 3639 | else |
3640 | hub->limited_power = 0; | |
1da177e4 LT |
3641 | } |
3642 | if (hubchange & HUB_CHANGE_OVERCURRENT) { | |
752d57a8 PB |
3643 | u16 status = 0; |
3644 | u16 unused; | |
3645 | ||
3646 | dev_dbg(hub_dev, "over-current change\n"); | |
1da177e4 | 3647 | clear_hub_feature(hdev, C_HUB_OVER_CURRENT); |
752d57a8 | 3648 | msleep(500); /* Cool down */ |
8520f380 | 3649 | hub_power_on(hub, true); |
752d57a8 PB |
3650 | hub_hub_status(hub, &status, &unused); |
3651 | if (status & HUB_STATUS_OVERCURRENT) | |
3652 | dev_err(hub_dev, "over-current " | |
3653 | "condition\n"); | |
1da177e4 LT |
3654 | } |
3655 | } | |
3656 | ||
8e4ceb38 AS |
3657 | loop_autopm: |
3658 | /* Balance the usb_autopm_get_interface() above */ | |
3659 | usb_autopm_put_interface_no_suspend(intf); | |
3660 | loop: | |
3661 | /* Balance the usb_autopm_get_interface_no_resume() in | |
3662 | * kick_khubd() and allow autosuspend. | |
3663 | */ | |
3664 | usb_autopm_put_interface(intf); | |
9bbdf1e0 | 3665 | loop_disconnected: |
1da177e4 | 3666 | usb_unlock_device(hdev); |
e8054854 | 3667 | kref_put(&hub->kref, hub_release); |
1da177e4 LT |
3668 | |
3669 | } /* end while (1) */ | |
3670 | } | |
3671 | ||
3672 | static int hub_thread(void *__unused) | |
3673 | { | |
3bb1af52 AS |
3674 | /* khubd needs to be freezable to avoid intefering with USB-PERSIST |
3675 | * port handover. Otherwise it might see that a full-speed device | |
3676 | * was gone before the EHCI controller had handed its port over to | |
3677 | * the companion full-speed controller. | |
3678 | */ | |
83144186 | 3679 | set_freezable(); |
3bb1af52 | 3680 | |
1da177e4 LT |
3681 | do { |
3682 | hub_events(); | |
e42837bc | 3683 | wait_event_freezable(khubd_wait, |
9c8d6178 | 3684 | !list_empty(&hub_event_list) || |
3685 | kthread_should_stop()); | |
9c8d6178 | 3686 | } while (!kthread_should_stop() || !list_empty(&hub_event_list)); |
1da177e4 | 3687 | |
9c8d6178 | 3688 | pr_debug("%s: khubd exiting\n", usbcore_name); |
3689 | return 0; | |
1da177e4 LT |
3690 | } |
3691 | ||
1e927d96 | 3692 | static const struct usb_device_id hub_id_table[] = { |
1da177e4 LT |
3693 | { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, |
3694 | .bDeviceClass = USB_CLASS_HUB}, | |
3695 | { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, | |
3696 | .bInterfaceClass = USB_CLASS_HUB}, | |
3697 | { } /* Terminating entry */ | |
3698 | }; | |
3699 | ||
3700 | MODULE_DEVICE_TABLE (usb, hub_id_table); | |
3701 | ||
3702 | static struct usb_driver hub_driver = { | |
1da177e4 LT |
3703 | .name = "hub", |
3704 | .probe = hub_probe, | |
3705 | .disconnect = hub_disconnect, | |
3706 | .suspend = hub_suspend, | |
3707 | .resume = hub_resume, | |
f07600cf | 3708 | .reset_resume = hub_reset_resume, |
7de18d8b AS |
3709 | .pre_reset = hub_pre_reset, |
3710 | .post_reset = hub_post_reset, | |
c532b29a | 3711 | .unlocked_ioctl = hub_ioctl, |
1da177e4 | 3712 | .id_table = hub_id_table, |
40f122f3 | 3713 | .supports_autosuspend = 1, |
1da177e4 LT |
3714 | }; |
3715 | ||
3716 | int usb_hub_init(void) | |
3717 | { | |
1da177e4 LT |
3718 | if (usb_register(&hub_driver) < 0) { |
3719 | printk(KERN_ERR "%s: can't register hub driver\n", | |
3720 | usbcore_name); | |
3721 | return -1; | |
3722 | } | |
3723 | ||
9c8d6178 | 3724 | khubd_task = kthread_run(hub_thread, NULL, "khubd"); |
3725 | if (!IS_ERR(khubd_task)) | |
1da177e4 | 3726 | return 0; |
1da177e4 LT |
3727 | |
3728 | /* Fall through if kernel_thread failed */ | |
3729 | usb_deregister(&hub_driver); | |
3730 | printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); | |
3731 | ||
3732 | return -1; | |
3733 | } | |
3734 | ||
3735 | void usb_hub_cleanup(void) | |
3736 | { | |
9c8d6178 | 3737 | kthread_stop(khubd_task); |
1da177e4 LT |
3738 | |
3739 | /* | |
3740 | * Hub resources are freed for us by usb_deregister. It calls | |
3741 | * usb_driver_purge on every device which in turn calls that | |
3742 | * devices disconnect function if it is using this driver. | |
3743 | * The hub_disconnect function takes care of releasing the | |
3744 | * individual hub resources. -greg | |
3745 | */ | |
3746 | usb_deregister(&hub_driver); | |
3747 | } /* usb_hub_cleanup() */ | |
3748 | ||
eb764c4b AS |
3749 | static int descriptors_changed(struct usb_device *udev, |
3750 | struct usb_device_descriptor *old_device_descriptor) | |
3751 | { | |
3752 | int changed = 0; | |
3753 | unsigned index; | |
3754 | unsigned serial_len = 0; | |
3755 | unsigned len; | |
3756 | unsigned old_length; | |
3757 | int length; | |
3758 | char *buf; | |
3759 | ||
3760 | if (memcmp(&udev->descriptor, old_device_descriptor, | |
3761 | sizeof(*old_device_descriptor)) != 0) | |
3762 | return 1; | |
3763 | ||
3764 | /* Since the idVendor, idProduct, and bcdDevice values in the | |
3765 | * device descriptor haven't changed, we will assume the | |
3766 | * Manufacturer and Product strings haven't changed either. | |
3767 | * But the SerialNumber string could be different (e.g., a | |
3768 | * different flash card of the same brand). | |
3769 | */ | |
3770 | if (udev->serial) | |
3771 | serial_len = strlen(udev->serial) + 1; | |
1da177e4 | 3772 | |
eb764c4b | 3773 | len = serial_len; |
1da177e4 | 3774 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
eb764c4b AS |
3775 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
3776 | len = max(len, old_length); | |
1da177e4 | 3777 | } |
eb764c4b | 3778 | |
0cc1a51f | 3779 | buf = kmalloc(len, GFP_NOIO); |
1da177e4 LT |
3780 | if (buf == NULL) { |
3781 | dev_err(&udev->dev, "no mem to re-read configs after reset\n"); | |
3782 | /* assume the worst */ | |
3783 | return 1; | |
3784 | } | |
3785 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { | |
eb764c4b | 3786 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
1da177e4 LT |
3787 | length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, |
3788 | old_length); | |
eb764c4b | 3789 | if (length != old_length) { |
1da177e4 LT |
3790 | dev_dbg(&udev->dev, "config index %d, error %d\n", |
3791 | index, length); | |
eb764c4b | 3792 | changed = 1; |
1da177e4 LT |
3793 | break; |
3794 | } | |
3795 | if (memcmp (buf, udev->rawdescriptors[index], old_length) | |
3796 | != 0) { | |
3797 | dev_dbg(&udev->dev, "config index %d changed (#%d)\n", | |
eb764c4b AS |
3798 | index, |
3799 | ((struct usb_config_descriptor *) buf)-> | |
3800 | bConfigurationValue); | |
3801 | changed = 1; | |
1da177e4 LT |
3802 | break; |
3803 | } | |
3804 | } | |
eb764c4b AS |
3805 | |
3806 | if (!changed && serial_len) { | |
3807 | length = usb_string(udev, udev->descriptor.iSerialNumber, | |
3808 | buf, serial_len); | |
3809 | if (length + 1 != serial_len) { | |
3810 | dev_dbg(&udev->dev, "serial string error %d\n", | |
3811 | length); | |
3812 | changed = 1; | |
3813 | } else if (memcmp(buf, udev->serial, length) != 0) { | |
3814 | dev_dbg(&udev->dev, "serial string changed\n"); | |
3815 | changed = 1; | |
3816 | } | |
3817 | } | |
3818 | ||
1da177e4 | 3819 | kfree(buf); |
eb764c4b | 3820 | return changed; |
1da177e4 LT |
3821 | } |
3822 | ||
3823 | /** | |
742120c6 | 3824 | * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device |
1da177e4 LT |
3825 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
3826 | * | |
79efa097 AS |
3827 | * WARNING - don't use this routine to reset a composite device |
3828 | * (one with multiple interfaces owned by separate drivers)! | |
742120c6 | 3829 | * Use usb_reset_device() instead. |
1da177e4 LT |
3830 | * |
3831 | * Do a port reset, reassign the device's address, and establish its | |
3832 | * former operating configuration. If the reset fails, or the device's | |
3833 | * descriptors change from their values before the reset, or the original | |
3834 | * configuration and altsettings cannot be restored, a flag will be set | |
3835 | * telling khubd to pretend the device has been disconnected and then | |
3836 | * re-connected. All drivers will be unbound, and the device will be | |
3837 | * re-enumerated and probed all over again. | |
3838 | * | |
3839 | * Returns 0 if the reset succeeded, -ENODEV if the device has been | |
3840 | * flagged for logical disconnection, or some other negative error code | |
3841 | * if the reset wasn't even attempted. | |
3842 | * | |
3843 | * The caller must own the device lock. For example, it's safe to use | |
3844 | * this from a driver probe() routine after downloading new firmware. | |
3845 | * For calls that might not occur during probe(), drivers should lock | |
3846 | * the device using usb_lock_device_for_reset(). | |
6bc6cff5 AS |
3847 | * |
3848 | * Locking exception: This routine may also be called from within an | |
3849 | * autoresume handler. Such usage won't conflict with other tasks | |
3850 | * holding the device lock because these tasks should always call | |
3851 | * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. | |
1da177e4 | 3852 | */ |
742120c6 | 3853 | static int usb_reset_and_verify_device(struct usb_device *udev) |
1da177e4 LT |
3854 | { |
3855 | struct usb_device *parent_hdev = udev->parent; | |
3856 | struct usb_hub *parent_hub; | |
3f0479e0 | 3857 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 3858 | struct usb_device_descriptor descriptor = udev->descriptor; |
12c3da34 AS |
3859 | int i, ret = 0; |
3860 | int port1 = udev->portnum; | |
1da177e4 LT |
3861 | |
3862 | if (udev->state == USB_STATE_NOTATTACHED || | |
3863 | udev->state == USB_STATE_SUSPENDED) { | |
3864 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
3865 | udev->state); | |
3866 | return -EINVAL; | |
3867 | } | |
3868 | ||
3869 | if (!parent_hdev) { | |
4bec9917 | 3870 | /* this requires hcd-specific logic; see ohci_restart() */ |
441b62c1 | 3871 | dev_dbg(&udev->dev, "%s for root hub!\n", __func__); |
1da177e4 LT |
3872 | return -EISDIR; |
3873 | } | |
1da177e4 LT |
3874 | parent_hub = hdev_to_hub(parent_hdev); |
3875 | ||
1da177e4 LT |
3876 | set_bit(port1, parent_hub->busy_bits); |
3877 | for (i = 0; i < SET_CONFIG_TRIES; ++i) { | |
3878 | ||
3879 | /* ep0 maxpacket size may change; let the HCD know about it. | |
3880 | * Other endpoints will be handled by re-enumeration. */ | |
fc721f51 | 3881 | usb_ep0_reinit(udev); |
1da177e4 | 3882 | ret = hub_port_init(parent_hub, udev, port1, i); |
dd4dd19e | 3883 | if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) |
1da177e4 LT |
3884 | break; |
3885 | } | |
3886 | clear_bit(port1, parent_hub->busy_bits); | |
d5cbad4b | 3887 | |
1da177e4 LT |
3888 | if (ret < 0) |
3889 | goto re_enumerate; | |
3890 | ||
3891 | /* Device might have changed firmware (DFU or similar) */ | |
eb764c4b | 3892 | if (descriptors_changed(udev, &descriptor)) { |
1da177e4 LT |
3893 | dev_info(&udev->dev, "device firmware changed\n"); |
3894 | udev->descriptor = descriptor; /* for disconnect() calls */ | |
3895 | goto re_enumerate; | |
3896 | } | |
4fe0387a AS |
3897 | |
3898 | /* Restore the device's previous configuration */ | |
1da177e4 LT |
3899 | if (!udev->actconfig) |
3900 | goto done; | |
3f0479e0 | 3901 | |
d673bfcb | 3902 | mutex_lock(hcd->bandwidth_mutex); |
3f0479e0 SS |
3903 | ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); |
3904 | if (ret < 0) { | |
3905 | dev_warn(&udev->dev, | |
3906 | "Busted HC? Not enough HCD resources for " | |
3907 | "old configuration.\n"); | |
d673bfcb | 3908 | mutex_unlock(hcd->bandwidth_mutex); |
3f0479e0 SS |
3909 | goto re_enumerate; |
3910 | } | |
1da177e4 LT |
3911 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
3912 | USB_REQ_SET_CONFIGURATION, 0, | |
3913 | udev->actconfig->desc.bConfigurationValue, 0, | |
3914 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
3915 | if (ret < 0) { | |
3916 | dev_err(&udev->dev, | |
3917 | "can't restore configuration #%d (error=%d)\n", | |
3918 | udev->actconfig->desc.bConfigurationValue, ret); | |
d673bfcb | 3919 | mutex_unlock(hcd->bandwidth_mutex); |
1da177e4 LT |
3920 | goto re_enumerate; |
3921 | } | |
d673bfcb | 3922 | mutex_unlock(hcd->bandwidth_mutex); |
1da177e4 LT |
3923 | usb_set_device_state(udev, USB_STATE_CONFIGURED); |
3924 | ||
4fe0387a AS |
3925 | /* Put interfaces back into the same altsettings as before. |
3926 | * Don't bother to send the Set-Interface request for interfaces | |
3927 | * that were already in altsetting 0; besides being unnecessary, | |
3928 | * many devices can't handle it. Instead just reset the host-side | |
3929 | * endpoint state. | |
3930 | */ | |
1da177e4 | 3931 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
3f0479e0 SS |
3932 | struct usb_host_config *config = udev->actconfig; |
3933 | struct usb_interface *intf = config->interface[i]; | |
1da177e4 LT |
3934 | struct usb_interface_descriptor *desc; |
3935 | ||
1da177e4 | 3936 | desc = &intf->cur_altsetting->desc; |
4fe0387a AS |
3937 | if (desc->bAlternateSetting == 0) { |
3938 | usb_disable_interface(udev, intf, true); | |
3939 | usb_enable_interface(udev, intf, true); | |
3940 | ret = 0; | |
3941 | } else { | |
04a723ea SS |
3942 | /* Let the bandwidth allocation function know that this |
3943 | * device has been reset, and it will have to use | |
3944 | * alternate setting 0 as the current alternate setting. | |
3f0479e0 | 3945 | */ |
04a723ea | 3946 | intf->resetting_device = 1; |
4fe0387a AS |
3947 | ret = usb_set_interface(udev, desc->bInterfaceNumber, |
3948 | desc->bAlternateSetting); | |
04a723ea | 3949 | intf->resetting_device = 0; |
4fe0387a | 3950 | } |
1da177e4 LT |
3951 | if (ret < 0) { |
3952 | dev_err(&udev->dev, "failed to restore interface %d " | |
3953 | "altsetting %d (error=%d)\n", | |
3954 | desc->bInterfaceNumber, | |
3955 | desc->bAlternateSetting, | |
3956 | ret); | |
3957 | goto re_enumerate; | |
3958 | } | |
3959 | } | |
3960 | ||
3961 | done: | |
1da177e4 LT |
3962 | return 0; |
3963 | ||
3964 | re_enumerate: | |
3965 | hub_port_logical_disconnect(parent_hub, port1); | |
3966 | return -ENODEV; | |
3967 | } | |
79efa097 AS |
3968 | |
3969 | /** | |
742120c6 | 3970 | * usb_reset_device - warn interface drivers and perform a USB port reset |
79efa097 | 3971 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
79efa097 AS |
3972 | * |
3973 | * Warns all drivers bound to registered interfaces (using their pre_reset | |
3974 | * method), performs the port reset, and then lets the drivers know that | |
3975 | * the reset is over (using their post_reset method). | |
3976 | * | |
742120c6 | 3977 | * Return value is the same as for usb_reset_and_verify_device(). |
79efa097 AS |
3978 | * |
3979 | * The caller must own the device lock. For example, it's safe to use | |
3980 | * this from a driver probe() routine after downloading new firmware. | |
3981 | * For calls that might not occur during probe(), drivers should lock | |
3982 | * the device using usb_lock_device_for_reset(). | |
78d9a487 AS |
3983 | * |
3984 | * If an interface is currently being probed or disconnected, we assume | |
3985 | * its driver knows how to handle resets. For all other interfaces, | |
3986 | * if the driver doesn't have pre_reset and post_reset methods then | |
3987 | * we attempt to unbind it and rebind afterward. | |
79efa097 | 3988 | */ |
742120c6 | 3989 | int usb_reset_device(struct usb_device *udev) |
79efa097 AS |
3990 | { |
3991 | int ret; | |
852c4b43 | 3992 | int i; |
79efa097 AS |
3993 | struct usb_host_config *config = udev->actconfig; |
3994 | ||
3995 | if (udev->state == USB_STATE_NOTATTACHED || | |
3996 | udev->state == USB_STATE_SUSPENDED) { | |
3997 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
3998 | udev->state); | |
3999 | return -EINVAL; | |
4000 | } | |
4001 | ||
645daaab | 4002 | /* Prevent autosuspend during the reset */ |
94fcda1f | 4003 | usb_autoresume_device(udev); |
645daaab | 4004 | |
79efa097 | 4005 | if (config) { |
79efa097 | 4006 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { |
852c4b43 AS |
4007 | struct usb_interface *cintf = config->interface[i]; |
4008 | struct usb_driver *drv; | |
78d9a487 | 4009 | int unbind = 0; |
852c4b43 AS |
4010 | |
4011 | if (cintf->dev.driver) { | |
79efa097 | 4012 | drv = to_usb_driver(cintf->dev.driver); |
78d9a487 AS |
4013 | if (drv->pre_reset && drv->post_reset) |
4014 | unbind = (drv->pre_reset)(cintf); | |
4015 | else if (cintf->condition == | |
4016 | USB_INTERFACE_BOUND) | |
4017 | unbind = 1; | |
4018 | if (unbind) | |
4019 | usb_forced_unbind_intf(cintf); | |
79efa097 AS |
4020 | } |
4021 | } | |
4022 | } | |
4023 | ||
742120c6 | 4024 | ret = usb_reset_and_verify_device(udev); |
79efa097 AS |
4025 | |
4026 | if (config) { | |
79efa097 | 4027 | for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { |
852c4b43 AS |
4028 | struct usb_interface *cintf = config->interface[i]; |
4029 | struct usb_driver *drv; | |
78d9a487 | 4030 | int rebind = cintf->needs_binding; |
852c4b43 | 4031 | |
78d9a487 | 4032 | if (!rebind && cintf->dev.driver) { |
79efa097 AS |
4033 | drv = to_usb_driver(cintf->dev.driver); |
4034 | if (drv->post_reset) | |
78d9a487 AS |
4035 | rebind = (drv->post_reset)(cintf); |
4036 | else if (cintf->condition == | |
4037 | USB_INTERFACE_BOUND) | |
4038 | rebind = 1; | |
79efa097 | 4039 | } |
6c640945 | 4040 | if (ret == 0 && rebind) |
78d9a487 | 4041 | usb_rebind_intf(cintf); |
79efa097 AS |
4042 | } |
4043 | } | |
4044 | ||
94fcda1f | 4045 | usb_autosuspend_device(udev); |
79efa097 AS |
4046 | return ret; |
4047 | } | |
742120c6 | 4048 | EXPORT_SYMBOL_GPL(usb_reset_device); |
dc023dce IPG |
4049 | |
4050 | ||
4051 | /** | |
4052 | * usb_queue_reset_device - Reset a USB device from an atomic context | |
4053 | * @iface: USB interface belonging to the device to reset | |
4054 | * | |
4055 | * This function can be used to reset a USB device from an atomic | |
4056 | * context, where usb_reset_device() won't work (as it blocks). | |
4057 | * | |
4058 | * Doing a reset via this method is functionally equivalent to calling | |
4059 | * usb_reset_device(), except for the fact that it is delayed to a | |
4060 | * workqueue. This means that any drivers bound to other interfaces | |
4061 | * might be unbound, as well as users from usbfs in user space. | |
4062 | * | |
4063 | * Corner cases: | |
4064 | * | |
4065 | * - Scheduling two resets at the same time from two different drivers | |
4066 | * attached to two different interfaces of the same device is | |
4067 | * possible; depending on how the driver attached to each interface | |
4068 | * handles ->pre_reset(), the second reset might happen or not. | |
4069 | * | |
4070 | * - If a driver is unbound and it had a pending reset, the reset will | |
4071 | * be cancelled. | |
4072 | * | |
4073 | * - This function can be called during .probe() or .disconnect() | |
4074 | * times. On return from .disconnect(), any pending resets will be | |
4075 | * cancelled. | |
4076 | * | |
4077 | * There is no no need to lock/unlock the @reset_ws as schedule_work() | |
4078 | * does its own. | |
4079 | * | |
4080 | * NOTE: We don't do any reference count tracking because it is not | |
4081 | * needed. The lifecycle of the work_struct is tied to the | |
4082 | * usb_interface. Before destroying the interface we cancel the | |
4083 | * work_struct, so the fact that work_struct is queued and or | |
4084 | * running means the interface (and thus, the device) exist and | |
4085 | * are referenced. | |
4086 | */ | |
4087 | void usb_queue_reset_device(struct usb_interface *iface) | |
4088 | { | |
4089 | schedule_work(&iface->reset_ws); | |
4090 | } | |
4091 | EXPORT_SYMBOL_GPL(usb_queue_reset_device); |