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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> |
9bbdf1e0 | 27 | #include <linux/pm_runtime.h> |
1da177e4 | 28 | |
1da177e4 LT |
29 | #include <asm/uaccess.h> |
30 | #include <asm/byteorder.h> | |
31 | ||
32 | #include "usb.h" | |
1da177e4 | 33 | |
f2a383e4 GKH |
34 | /* if we are in debug mode, always announce new devices */ |
35 | #ifdef DEBUG | |
36 | #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES | |
37 | #define CONFIG_USB_ANNOUNCE_NEW_DEVICES | |
38 | #endif | |
39 | #endif | |
40 | ||
1bb5f66b AS |
41 | struct usb_hub { |
42 | struct device *intfdev; /* the "interface" device */ | |
43 | struct usb_device *hdev; | |
e8054854 | 44 | struct kref kref; |
1bb5f66b AS |
45 | struct urb *urb; /* for interrupt polling pipe */ |
46 | ||
47 | /* buffer for urb ... with extra space in case of babble */ | |
48 | char (*buffer)[8]; | |
1bb5f66b AS |
49 | union { |
50 | struct usb_hub_status hub; | |
51 | struct usb_port_status port; | |
52 | } *status; /* buffer for status reports */ | |
db90e7a1 | 53 | struct mutex status_mutex; /* for the status buffer */ |
1bb5f66b AS |
54 | |
55 | int error; /* last reported error */ | |
56 | int nerrors; /* track consecutive errors */ | |
57 | ||
58 | struct list_head event_list; /* hubs w/data or errs ready */ | |
59 | unsigned long event_bits[1]; /* status change bitmask */ | |
60 | unsigned long change_bits[1]; /* ports with logical connect | |
61 | status change */ | |
62 | unsigned long busy_bits[1]; /* ports being reset or | |
63 | resumed */ | |
253e0572 AS |
64 | unsigned long removed_bits[1]; /* ports with a "removed" |
65 | device present */ | |
1bb5f66b AS |
66 | #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */ |
67 | #error event_bits[] is too short! | |
68 | #endif | |
69 | ||
70 | struct usb_hub_descriptor *descriptor; /* class descriptor */ | |
71 | struct usb_tt tt; /* Transaction Translator */ | |
72 | ||
73 | unsigned mA_per_port; /* current for each child */ | |
74 | ||
75 | unsigned limited_power:1; | |
76 | unsigned quiescing:1; | |
e8054854 | 77 | unsigned disconnected:1; |
1bb5f66b AS |
78 | |
79 | unsigned has_indicators:1; | |
80 | u8 indicator[USB_MAXCHILDREN]; | |
6d5aefb8 | 81 | struct delayed_work leds; |
8520f380 | 82 | struct delayed_work init_work; |
7cbe5dca | 83 | void **port_owners; |
1bb5f66b AS |
84 | }; |
85 | ||
86 | ||
1da177e4 | 87 | /* Protect struct usb_device->state and ->children members |
9ad3d6cc | 88 | * Note: Both are also protected by ->dev.sem, except that ->state can |
1da177e4 LT |
89 | * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ |
90 | static DEFINE_SPINLOCK(device_state_lock); | |
91 | ||
92 | /* khubd's worklist and its lock */ | |
93 | static DEFINE_SPINLOCK(hub_event_lock); | |
94 | static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ | |
95 | ||
96 | /* Wakes up khubd */ | |
97 | static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); | |
98 | ||
9c8d6178 | 99 | static struct task_struct *khubd_task; |
1da177e4 LT |
100 | |
101 | /* cycle leds on hubs that aren't blinking for attention */ | |
102 | static int blinkenlights = 0; | |
103 | module_param (blinkenlights, bool, S_IRUGO); | |
104 | MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); | |
105 | ||
fd7c519d JK |
106 | /* |
107 | * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about | |
108 | * 10 seconds to send reply for the initial 64-byte descriptor request. | |
109 | */ | |
110 | /* define initial 64-byte descriptor request timeout in milliseconds */ | |
111 | static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; | |
112 | module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); | |
b9cef6c3 WF |
113 | MODULE_PARM_DESC(initial_descriptor_timeout, |
114 | "initial 64-byte descriptor request timeout in milliseconds " | |
115 | "(default 5000 - 5.0 seconds)"); | |
fd7c519d | 116 | |
1da177e4 LT |
117 | /* |
118 | * As of 2.6.10 we introduce a new USB device initialization scheme which | |
119 | * closely resembles the way Windows works. Hopefully it will be compatible | |
120 | * with a wider range of devices than the old scheme. However some previously | |
121 | * working devices may start giving rise to "device not accepting address" | |
122 | * errors; if that happens the user can try the old scheme by adjusting the | |
123 | * following module parameters. | |
124 | * | |
125 | * For maximum flexibility there are two boolean parameters to control the | |
126 | * hub driver's behavior. On the first initialization attempt, if the | |
127 | * "old_scheme_first" parameter is set then the old scheme will be used, | |
128 | * otherwise the new scheme is used. If that fails and "use_both_schemes" | |
129 | * is set, then the driver will make another attempt, using the other scheme. | |
130 | */ | |
131 | static int old_scheme_first = 0; | |
132 | module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); | |
133 | MODULE_PARM_DESC(old_scheme_first, | |
134 | "start with the old device initialization scheme"); | |
135 | ||
136 | static int use_both_schemes = 1; | |
137 | module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); | |
138 | MODULE_PARM_DESC(use_both_schemes, | |
139 | "try the other device initialization scheme if the " | |
140 | "first one fails"); | |
141 | ||
32fe0198 AS |
142 | /* Mutual exclusion for EHCI CF initialization. This interferes with |
143 | * port reset on some companion controllers. | |
144 | */ | |
145 | DECLARE_RWSEM(ehci_cf_port_reset_rwsem); | |
146 | EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); | |
147 | ||
948fea37 AS |
148 | #define HUB_DEBOUNCE_TIMEOUT 1500 |
149 | #define HUB_DEBOUNCE_STEP 25 | |
150 | #define HUB_DEBOUNCE_STABLE 100 | |
151 | ||
1da177e4 | 152 | |
742120c6 ML |
153 | static int usb_reset_and_verify_device(struct usb_device *udev); |
154 | ||
404d5b18 | 155 | static inline char *portspeed(int portstatus) |
1da177e4 | 156 | { |
288ead45 | 157 | if (portstatus & USB_PORT_STAT_HIGH_SPEED) |
1da177e4 | 158 | return "480 Mb/s"; |
288ead45 | 159 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) |
1da177e4 | 160 | return "1.5 Mb/s"; |
288ead45 | 161 | else if (portstatus & USB_PORT_STAT_SUPER_SPEED) |
d2e9b4d6 | 162 | return "5.0 Gb/s"; |
1da177e4 LT |
163 | else |
164 | return "12 Mb/s"; | |
165 | } | |
1da177e4 LT |
166 | |
167 | /* Note that hdev or one of its children must be locked! */ | |
25118084 | 168 | static struct usb_hub *hdev_to_hub(struct usb_device *hdev) |
1da177e4 | 169 | { |
25118084 AS |
170 | if (!hdev || !hdev->actconfig) |
171 | return NULL; | |
1da177e4 LT |
172 | return usb_get_intfdata(hdev->actconfig->interface[0]); |
173 | } | |
174 | ||
175 | /* USB 2.0 spec Section 11.24.4.5 */ | |
176 | static int get_hub_descriptor(struct usb_device *hdev, void *data, int size) | |
177 | { | |
178 | int i, ret; | |
179 | ||
180 | for (i = 0; i < 3; i++) { | |
181 | ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
182 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, | |
183 | USB_DT_HUB << 8, 0, data, size, | |
184 | USB_CTRL_GET_TIMEOUT); | |
185 | if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) | |
186 | return ret; | |
187 | } | |
188 | return -EINVAL; | |
189 | } | |
190 | ||
191 | /* | |
192 | * USB 2.0 spec Section 11.24.2.1 | |
193 | */ | |
194 | static int clear_hub_feature(struct usb_device *hdev, int feature) | |
195 | { | |
196 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
197 | USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); | |
198 | } | |
199 | ||
200 | /* | |
201 | * USB 2.0 spec Section 11.24.2.2 | |
202 | */ | |
203 | static int clear_port_feature(struct usb_device *hdev, int port1, int feature) | |
204 | { | |
205 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
206 | USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, | |
207 | NULL, 0, 1000); | |
208 | } | |
209 | ||
210 | /* | |
211 | * USB 2.0 spec Section 11.24.2.13 | |
212 | */ | |
213 | static int set_port_feature(struct usb_device *hdev, int port1, int feature) | |
214 | { | |
215 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
216 | USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, | |
217 | NULL, 0, 1000); | |
218 | } | |
219 | ||
220 | /* | |
221 | * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 | |
222 | * for info about using port indicators | |
223 | */ | |
224 | static void set_port_led( | |
225 | struct usb_hub *hub, | |
226 | int port1, | |
227 | int selector | |
228 | ) | |
229 | { | |
230 | int status = set_port_feature(hub->hdev, (selector << 8) | port1, | |
231 | USB_PORT_FEAT_INDICATOR); | |
232 | if (status < 0) | |
233 | dev_dbg (hub->intfdev, | |
234 | "port %d indicator %s status %d\n", | |
235 | port1, | |
236 | ({ char *s; switch (selector) { | |
237 | case HUB_LED_AMBER: s = "amber"; break; | |
238 | case HUB_LED_GREEN: s = "green"; break; | |
239 | case HUB_LED_OFF: s = "off"; break; | |
240 | case HUB_LED_AUTO: s = "auto"; break; | |
241 | default: s = "??"; break; | |
242 | }; s; }), | |
243 | status); | |
244 | } | |
245 | ||
246 | #define LED_CYCLE_PERIOD ((2*HZ)/3) | |
247 | ||
c4028958 | 248 | static void led_work (struct work_struct *work) |
1da177e4 | 249 | { |
c4028958 DH |
250 | struct usb_hub *hub = |
251 | container_of(work, struct usb_hub, leds.work); | |
1da177e4 LT |
252 | struct usb_device *hdev = hub->hdev; |
253 | unsigned i; | |
254 | unsigned changed = 0; | |
255 | int cursor = -1; | |
256 | ||
257 | if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) | |
258 | return; | |
259 | ||
260 | for (i = 0; i < hub->descriptor->bNbrPorts; i++) { | |
261 | unsigned selector, mode; | |
262 | ||
263 | /* 30%-50% duty cycle */ | |
264 | ||
265 | switch (hub->indicator[i]) { | |
266 | /* cycle marker */ | |
267 | case INDICATOR_CYCLE: | |
268 | cursor = i; | |
269 | selector = HUB_LED_AUTO; | |
270 | mode = INDICATOR_AUTO; | |
271 | break; | |
272 | /* blinking green = sw attention */ | |
273 | case INDICATOR_GREEN_BLINK: | |
274 | selector = HUB_LED_GREEN; | |
275 | mode = INDICATOR_GREEN_BLINK_OFF; | |
276 | break; | |
277 | case INDICATOR_GREEN_BLINK_OFF: | |
278 | selector = HUB_LED_OFF; | |
279 | mode = INDICATOR_GREEN_BLINK; | |
280 | break; | |
281 | /* blinking amber = hw attention */ | |
282 | case INDICATOR_AMBER_BLINK: | |
283 | selector = HUB_LED_AMBER; | |
284 | mode = INDICATOR_AMBER_BLINK_OFF; | |
285 | break; | |
286 | case INDICATOR_AMBER_BLINK_OFF: | |
287 | selector = HUB_LED_OFF; | |
288 | mode = INDICATOR_AMBER_BLINK; | |
289 | break; | |
290 | /* blink green/amber = reserved */ | |
291 | case INDICATOR_ALT_BLINK: | |
292 | selector = HUB_LED_GREEN; | |
293 | mode = INDICATOR_ALT_BLINK_OFF; | |
294 | break; | |
295 | case INDICATOR_ALT_BLINK_OFF: | |
296 | selector = HUB_LED_AMBER; | |
297 | mode = INDICATOR_ALT_BLINK; | |
298 | break; | |
299 | default: | |
300 | continue; | |
301 | } | |
302 | if (selector != HUB_LED_AUTO) | |
303 | changed = 1; | |
304 | set_port_led(hub, i + 1, selector); | |
305 | hub->indicator[i] = mode; | |
306 | } | |
307 | if (!changed && blinkenlights) { | |
308 | cursor++; | |
309 | cursor %= hub->descriptor->bNbrPorts; | |
310 | set_port_led(hub, cursor + 1, HUB_LED_GREEN); | |
311 | hub->indicator[cursor] = INDICATOR_CYCLE; | |
312 | changed++; | |
313 | } | |
314 | if (changed) | |
315 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); | |
316 | } | |
317 | ||
318 | /* use a short timeout for hub/port status fetches */ | |
319 | #define USB_STS_TIMEOUT 1000 | |
320 | #define USB_STS_RETRIES 5 | |
321 | ||
322 | /* | |
323 | * USB 2.0 spec Section 11.24.2.6 | |
324 | */ | |
325 | static int get_hub_status(struct usb_device *hdev, | |
326 | struct usb_hub_status *data) | |
327 | { | |
328 | int i, status = -ETIMEDOUT; | |
329 | ||
330 | for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { | |
331 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
332 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, | |
333 | data, sizeof(*data), USB_STS_TIMEOUT); | |
334 | } | |
335 | return status; | |
336 | } | |
337 | ||
338 | /* | |
339 | * USB 2.0 spec Section 11.24.2.7 | |
340 | */ | |
341 | static int get_port_status(struct usb_device *hdev, int port1, | |
342 | struct usb_port_status *data) | |
343 | { | |
344 | int i, status = -ETIMEDOUT; | |
345 | ||
346 | for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { | |
347 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
348 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, | |
349 | data, sizeof(*data), USB_STS_TIMEOUT); | |
350 | } | |
351 | return status; | |
352 | } | |
353 | ||
3eb14915 AS |
354 | static int hub_port_status(struct usb_hub *hub, int port1, |
355 | u16 *status, u16 *change) | |
356 | { | |
357 | int ret; | |
358 | ||
359 | mutex_lock(&hub->status_mutex); | |
360 | ret = get_port_status(hub->hdev, port1, &hub->status->port); | |
361 | if (ret < 4) { | |
362 | dev_err(hub->intfdev, | |
363 | "%s failed (err = %d)\n", __func__, ret); | |
364 | if (ret >= 0) | |
365 | ret = -EIO; | |
366 | } else { | |
367 | *status = le16_to_cpu(hub->status->port.wPortStatus); | |
368 | *change = le16_to_cpu(hub->status->port.wPortChange); | |
369 | ret = 0; | |
370 | } | |
371 | mutex_unlock(&hub->status_mutex); | |
372 | return ret; | |
373 | } | |
374 | ||
1da177e4 LT |
375 | static void kick_khubd(struct usb_hub *hub) |
376 | { | |
377 | unsigned long flags; | |
378 | ||
379 | spin_lock_irqsave(&hub_event_lock, flags); | |
2e2c5eea | 380 | if (!hub->disconnected && list_empty(&hub->event_list)) { |
1da177e4 | 381 | list_add_tail(&hub->event_list, &hub_event_list); |
8e4ceb38 AS |
382 | |
383 | /* Suppress autosuspend until khubd runs */ | |
384 | usb_autopm_get_interface_no_resume( | |
385 | to_usb_interface(hub->intfdev)); | |
1da177e4 LT |
386 | wake_up(&khubd_wait); |
387 | } | |
388 | spin_unlock_irqrestore(&hub_event_lock, flags); | |
389 | } | |
390 | ||
391 | void usb_kick_khubd(struct usb_device *hdev) | |
392 | { | |
25118084 AS |
393 | struct usb_hub *hub = hdev_to_hub(hdev); |
394 | ||
395 | if (hub) | |
396 | kick_khubd(hub); | |
1da177e4 LT |
397 | } |
398 | ||
399 | ||
400 | /* completion function, fires on port status changes and various faults */ | |
7d12e780 | 401 | static void hub_irq(struct urb *urb) |
1da177e4 | 402 | { |
ec17cf1c | 403 | struct usb_hub *hub = urb->context; |
e015268d | 404 | int status = urb->status; |
71d2718f | 405 | unsigned i; |
1da177e4 LT |
406 | unsigned long bits; |
407 | ||
e015268d | 408 | switch (status) { |
1da177e4 LT |
409 | case -ENOENT: /* synchronous unlink */ |
410 | case -ECONNRESET: /* async unlink */ | |
411 | case -ESHUTDOWN: /* hardware going away */ | |
412 | return; | |
413 | ||
414 | default: /* presumably an error */ | |
415 | /* Cause a hub reset after 10 consecutive errors */ | |
e015268d | 416 | dev_dbg (hub->intfdev, "transfer --> %d\n", status); |
1da177e4 LT |
417 | if ((++hub->nerrors < 10) || hub->error) |
418 | goto resubmit; | |
e015268d | 419 | hub->error = status; |
1da177e4 | 420 | /* FALL THROUGH */ |
ec17cf1c | 421 | |
1da177e4 LT |
422 | /* let khubd handle things */ |
423 | case 0: /* we got data: port status changed */ | |
424 | bits = 0; | |
425 | for (i = 0; i < urb->actual_length; ++i) | |
426 | bits |= ((unsigned long) ((*hub->buffer)[i])) | |
427 | << (i*8); | |
428 | hub->event_bits[0] = bits; | |
429 | break; | |
430 | } | |
431 | ||
432 | hub->nerrors = 0; | |
433 | ||
434 | /* Something happened, let khubd figure it out */ | |
435 | kick_khubd(hub); | |
436 | ||
437 | resubmit: | |
438 | if (hub->quiescing) | |
439 | return; | |
440 | ||
441 | if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 | |
442 | && status != -ENODEV && status != -EPERM) | |
443 | dev_err (hub->intfdev, "resubmit --> %d\n", status); | |
444 | } | |
445 | ||
446 | /* USB 2.0 spec Section 11.24.2.3 */ | |
447 | static inline int | |
448 | hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) | |
449 | { | |
c2f6595f | 450 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
1da177e4 LT |
451 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, |
452 | tt, NULL, 0, 1000); | |
453 | } | |
454 | ||
455 | /* | |
456 | * enumeration blocks khubd for a long time. we use keventd instead, since | |
457 | * long blocking there is the exception, not the rule. accordingly, HCDs | |
458 | * talking to TTs must queue control transfers (not just bulk and iso), so | |
459 | * both can talk to the same hub concurrently. | |
460 | */ | |
cb88a1b8 | 461 | static void hub_tt_work(struct work_struct *work) |
1da177e4 | 462 | { |
c4028958 | 463 | struct usb_hub *hub = |
cb88a1b8 | 464 | container_of(work, struct usb_hub, tt.clear_work); |
1da177e4 | 465 | unsigned long flags; |
55e5fdfa | 466 | int limit = 100; |
1da177e4 LT |
467 | |
468 | spin_lock_irqsave (&hub->tt.lock, flags); | |
55e5fdfa | 469 | while (--limit && !list_empty (&hub->tt.clear_list)) { |
d0f830d3 | 470 | struct list_head *next; |
1da177e4 LT |
471 | struct usb_tt_clear *clear; |
472 | struct usb_device *hdev = hub->hdev; | |
cb88a1b8 | 473 | const struct hc_driver *drv; |
1da177e4 LT |
474 | int status; |
475 | ||
d0f830d3 HS |
476 | next = hub->tt.clear_list.next; |
477 | clear = list_entry (next, struct usb_tt_clear, clear_list); | |
1da177e4 LT |
478 | list_del (&clear->clear_list); |
479 | ||
480 | /* drop lock so HCD can concurrently report other TT errors */ | |
481 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
482 | status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); | |
1da177e4 LT |
483 | if (status) |
484 | dev_err (&hdev->dev, | |
485 | "clear tt %d (%04x) error %d\n", | |
486 | clear->tt, clear->devinfo, status); | |
cb88a1b8 AS |
487 | |
488 | /* Tell the HCD, even if the operation failed */ | |
489 | drv = clear->hcd->driver; | |
490 | if (drv->clear_tt_buffer_complete) | |
491 | (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); | |
492 | ||
1bc3c9e1 | 493 | kfree(clear); |
cb88a1b8 | 494 | spin_lock_irqsave(&hub->tt.lock, flags); |
1da177e4 LT |
495 | } |
496 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
497 | } | |
498 | ||
499 | /** | |
cb88a1b8 AS |
500 | * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub |
501 | * @urb: an URB associated with the failed or incomplete split transaction | |
1da177e4 LT |
502 | * |
503 | * High speed HCDs use this to tell the hub driver that some split control or | |
504 | * bulk transaction failed in a way that requires clearing internal state of | |
505 | * a transaction translator. This is normally detected (and reported) from | |
506 | * interrupt context. | |
507 | * | |
508 | * It may not be possible for that hub to handle additional full (or low) | |
509 | * speed transactions until that state is fully cleared out. | |
510 | */ | |
cb88a1b8 | 511 | int usb_hub_clear_tt_buffer(struct urb *urb) |
1da177e4 | 512 | { |
cb88a1b8 AS |
513 | struct usb_device *udev = urb->dev; |
514 | int pipe = urb->pipe; | |
1da177e4 LT |
515 | struct usb_tt *tt = udev->tt; |
516 | unsigned long flags; | |
517 | struct usb_tt_clear *clear; | |
518 | ||
519 | /* we've got to cope with an arbitrary number of pending TT clears, | |
520 | * since each TT has "at least two" buffers that can need it (and | |
521 | * there can be many TTs per hub). even if they're uncommon. | |
522 | */ | |
54e6ecb2 | 523 | if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { |
1da177e4 LT |
524 | dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); |
525 | /* FIXME recover somehow ... RESET_TT? */ | |
cb88a1b8 | 526 | return -ENOMEM; |
1da177e4 LT |
527 | } |
528 | ||
529 | /* info that CLEAR_TT_BUFFER needs */ | |
530 | clear->tt = tt->multi ? udev->ttport : 1; | |
531 | clear->devinfo = usb_pipeendpoint (pipe); | |
532 | clear->devinfo |= udev->devnum << 4; | |
533 | clear->devinfo |= usb_pipecontrol (pipe) | |
534 | ? (USB_ENDPOINT_XFER_CONTROL << 11) | |
535 | : (USB_ENDPOINT_XFER_BULK << 11); | |
536 | if (usb_pipein (pipe)) | |
537 | clear->devinfo |= 1 << 15; | |
cb88a1b8 AS |
538 | |
539 | /* info for completion callback */ | |
540 | clear->hcd = bus_to_hcd(udev->bus); | |
541 | clear->ep = urb->ep; | |
542 | ||
1da177e4 LT |
543 | /* tell keventd to clear state for this TT */ |
544 | spin_lock_irqsave (&tt->lock, flags); | |
545 | list_add_tail (&clear->clear_list, &tt->clear_list); | |
cb88a1b8 | 546 | schedule_work(&tt->clear_work); |
1da177e4 | 547 | spin_unlock_irqrestore (&tt->lock, flags); |
cb88a1b8 | 548 | return 0; |
1da177e4 | 549 | } |
cb88a1b8 | 550 | EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); |
1da177e4 | 551 | |
8520f380 AS |
552 | /* If do_delay is false, return the number of milliseconds the caller |
553 | * needs to delay. | |
554 | */ | |
555 | static unsigned hub_power_on(struct usb_hub *hub, bool do_delay) | |
1da177e4 LT |
556 | { |
557 | int port1; | |
b789696a | 558 | unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; |
8520f380 | 559 | unsigned delay; |
4489a571 AS |
560 | u16 wHubCharacteristics = |
561 | le16_to_cpu(hub->descriptor->wHubCharacteristics); | |
562 | ||
563 | /* Enable power on each port. Some hubs have reserved values | |
564 | * of LPSM (> 2) in their descriptors, even though they are | |
565 | * USB 2.0 hubs. Some hubs do not implement port-power switching | |
566 | * but only emulate it. In all cases, the ports won't work | |
567 | * unless we send these messages to the hub. | |
568 | */ | |
569 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) | |
1da177e4 | 570 | dev_dbg(hub->intfdev, "enabling power on all ports\n"); |
4489a571 AS |
571 | else |
572 | dev_dbg(hub->intfdev, "trying to enable port power on " | |
573 | "non-switchable hub\n"); | |
574 | for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) | |
575 | set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); | |
1da177e4 | 576 | |
b789696a | 577 | /* Wait at least 100 msec for power to become stable */ |
8520f380 AS |
578 | delay = max(pgood_delay, (unsigned) 100); |
579 | if (do_delay) | |
580 | msleep(delay); | |
581 | return delay; | |
1da177e4 LT |
582 | } |
583 | ||
1da177e4 LT |
584 | static int hub_hub_status(struct usb_hub *hub, |
585 | u16 *status, u16 *change) | |
586 | { | |
587 | int ret; | |
588 | ||
db90e7a1 | 589 | mutex_lock(&hub->status_mutex); |
1da177e4 LT |
590 | ret = get_hub_status(hub->hdev, &hub->status->hub); |
591 | if (ret < 0) | |
592 | dev_err (hub->intfdev, | |
441b62c1 | 593 | "%s failed (err = %d)\n", __func__, ret); |
1da177e4 LT |
594 | else { |
595 | *status = le16_to_cpu(hub->status->hub.wHubStatus); | |
596 | *change = le16_to_cpu(hub->status->hub.wHubChange); | |
597 | ret = 0; | |
598 | } | |
db90e7a1 | 599 | mutex_unlock(&hub->status_mutex); |
1da177e4 LT |
600 | return ret; |
601 | } | |
602 | ||
8b28c752 AS |
603 | static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) |
604 | { | |
605 | struct usb_device *hdev = hub->hdev; | |
0458d5b4 | 606 | int ret = 0; |
8b28c752 | 607 | |
0458d5b4 | 608 | if (hdev->children[port1-1] && set_state) |
8b28c752 AS |
609 | usb_set_device_state(hdev->children[port1-1], |
610 | USB_STATE_NOTATTACHED); | |
0458d5b4 AS |
611 | if (!hub->error) |
612 | ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); | |
8b28c752 AS |
613 | if (ret) |
614 | dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", | |
0458d5b4 | 615 | port1, ret); |
8b28c752 AS |
616 | return ret; |
617 | } | |
618 | ||
0458d5b4 AS |
619 | /* |
620 | * Disable a port and mark a logical connnect-change event, so that some | |
621 | * time later khubd will disconnect() any existing usb_device on the port | |
622 | * and will re-enumerate if there actually is a device attached. | |
623 | */ | |
624 | static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) | |
625 | { | |
626 | dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); | |
627 | hub_port_disable(hub, port1, 1); | |
7d069b7d | 628 | |
0458d5b4 AS |
629 | /* FIXME let caller ask to power down the port: |
630 | * - some devices won't enumerate without a VBUS power cycle | |
631 | * - SRP saves power that way | |
632 | * - ... new call, TBD ... | |
633 | * That's easy if this hub can switch power per-port, and | |
634 | * khubd reactivates the port later (timer, SRP, etc). | |
635 | * Powerdown must be optional, because of reset/DFU. | |
636 | */ | |
637 | ||
638 | set_bit(port1, hub->change_bits); | |
639 | kick_khubd(hub); | |
640 | } | |
641 | ||
253e0572 AS |
642 | /** |
643 | * usb_remove_device - disable a device's port on its parent hub | |
644 | * @udev: device to be disabled and removed | |
645 | * Context: @udev locked, must be able to sleep. | |
646 | * | |
647 | * After @udev's port has been disabled, khubd is notified and it will | |
648 | * see that the device has been disconnected. When the device is | |
649 | * physically unplugged and something is plugged in, the events will | |
650 | * be received and processed normally. | |
651 | */ | |
652 | int usb_remove_device(struct usb_device *udev) | |
653 | { | |
654 | struct usb_hub *hub; | |
655 | struct usb_interface *intf; | |
656 | ||
657 | if (!udev->parent) /* Can't remove a root hub */ | |
658 | return -EINVAL; | |
659 | hub = hdev_to_hub(udev->parent); | |
660 | intf = to_usb_interface(hub->intfdev); | |
661 | ||
662 | usb_autopm_get_interface(intf); | |
663 | set_bit(udev->portnum, hub->removed_bits); | |
664 | hub_port_logical_disconnect(hub, udev->portnum); | |
665 | usb_autopm_put_interface(intf); | |
666 | return 0; | |
667 | } | |
668 | ||
6ee0b270 | 669 | enum hub_activation_type { |
8e4ceb38 | 670 | HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ |
8520f380 | 671 | HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, |
6ee0b270 | 672 | }; |
5e6effae | 673 | |
8520f380 AS |
674 | static void hub_init_func2(struct work_struct *ws); |
675 | static void hub_init_func3(struct work_struct *ws); | |
676 | ||
f2835219 | 677 | static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) |
5e6effae AS |
678 | { |
679 | struct usb_device *hdev = hub->hdev; | |
680 | int port1; | |
f2835219 | 681 | int status; |
948fea37 | 682 | bool need_debounce_delay = false; |
8520f380 AS |
683 | unsigned delay; |
684 | ||
685 | /* Continue a partial initialization */ | |
686 | if (type == HUB_INIT2) | |
687 | goto init2; | |
688 | if (type == HUB_INIT3) | |
689 | goto init3; | |
5e6effae | 690 | |
f2835219 AS |
691 | /* After a resume, port power should still be on. |
692 | * For any other type of activation, turn it on. | |
693 | */ | |
8520f380 AS |
694 | if (type != HUB_RESUME) { |
695 | ||
696 | /* Speed up system boot by using a delayed_work for the | |
697 | * hub's initial power-up delays. This is pretty awkward | |
698 | * and the implementation looks like a home-brewed sort of | |
699 | * setjmp/longjmp, but it saves at least 100 ms for each | |
700 | * root hub (assuming usbcore is compiled into the kernel | |
701 | * rather than as a module). It adds up. | |
702 | * | |
703 | * This can't be done for HUB_RESUME or HUB_RESET_RESUME | |
704 | * because for those activation types the ports have to be | |
705 | * operational when we return. In theory this could be done | |
706 | * for HUB_POST_RESET, but it's easier not to. | |
707 | */ | |
708 | if (type == HUB_INIT) { | |
709 | delay = hub_power_on(hub, false); | |
710 | PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2); | |
711 | schedule_delayed_work(&hub->init_work, | |
712 | msecs_to_jiffies(delay)); | |
61fbeba1 AS |
713 | |
714 | /* Suppress autosuspend until init is done */ | |
8e4ceb38 AS |
715 | usb_autopm_get_interface_no_resume( |
716 | to_usb_interface(hub->intfdev)); | |
8520f380 AS |
717 | return; /* Continues at init2: below */ |
718 | } else { | |
719 | hub_power_on(hub, true); | |
720 | } | |
721 | } | |
722 | init2: | |
f2835219 | 723 | |
6ee0b270 AS |
724 | /* Check each port and set hub->change_bits to let khubd know |
725 | * which ports need attention. | |
5e6effae AS |
726 | */ |
727 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
728 | struct usb_device *udev = hdev->children[port1-1]; | |
5e6effae AS |
729 | u16 portstatus, portchange; |
730 | ||
6ee0b270 AS |
731 | portstatus = portchange = 0; |
732 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
733 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) | |
734 | dev_dbg(hub->intfdev, | |
735 | "port %d: status %04x change %04x\n", | |
736 | port1, portstatus, portchange); | |
737 | ||
738 | /* After anything other than HUB_RESUME (i.e., initialization | |
739 | * or any sort of reset), every port should be disabled. | |
740 | * Unconnected ports should likewise be disabled (paranoia), | |
741 | * and so should ports for which we have no usb_device. | |
742 | */ | |
743 | if ((portstatus & USB_PORT_STAT_ENABLE) && ( | |
744 | type != HUB_RESUME || | |
745 | !(portstatus & USB_PORT_STAT_CONNECTION) || | |
746 | !udev || | |
747 | udev->state == USB_STATE_NOTATTACHED)) { | |
9f0a6cd3 AX |
748 | /* |
749 | * USB3 protocol ports will automatically transition | |
750 | * to Enabled state when detect an USB3.0 device attach. | |
751 | * Do not disable USB3 protocol ports. | |
752 | * FIXME: USB3 root hub and external hubs are treated | |
753 | * differently here. | |
754 | */ | |
755 | if (hdev->descriptor.bDeviceProtocol != 3 || | |
756 | (!hdev->parent && | |
757 | !(portstatus & USB_PORT_STAT_SUPER_SPEED))) { | |
758 | clear_port_feature(hdev, port1, | |
759 | USB_PORT_FEAT_ENABLE); | |
760 | portstatus &= ~USB_PORT_STAT_ENABLE; | |
761 | } | |
5e6effae AS |
762 | } |
763 | ||
948fea37 AS |
764 | /* Clear status-change flags; we'll debounce later */ |
765 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
766 | need_debounce_delay = true; | |
767 | clear_port_feature(hub->hdev, port1, | |
768 | USB_PORT_FEAT_C_CONNECTION); | |
769 | } | |
770 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
771 | need_debounce_delay = true; | |
772 | clear_port_feature(hub->hdev, port1, | |
773 | USB_PORT_FEAT_C_ENABLE); | |
774 | } | |
775 | ||
253e0572 AS |
776 | /* We can forget about a "removed" device when there's a |
777 | * physical disconnect or the connect status changes. | |
778 | */ | |
779 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
780 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
781 | clear_bit(port1, hub->removed_bits); | |
782 | ||
6ee0b270 AS |
783 | if (!udev || udev->state == USB_STATE_NOTATTACHED) { |
784 | /* Tell khubd to disconnect the device or | |
785 | * check for a new connection | |
786 | */ | |
787 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) | |
788 | set_bit(port1, hub->change_bits); | |
789 | ||
790 | } else if (portstatus & USB_PORT_STAT_ENABLE) { | |
791 | /* The power session apparently survived the resume. | |
792 | * If there was an overcurrent or suspend change | |
793 | * (i.e., remote wakeup request), have khubd | |
794 | * take care of it. | |
795 | */ | |
796 | if (portchange) | |
797 | set_bit(port1, hub->change_bits); | |
5e6effae | 798 | |
6ee0b270 | 799 | } else if (udev->persist_enabled) { |
6ee0b270 | 800 | #ifdef CONFIG_PM |
5e6effae | 801 | udev->reset_resume = 1; |
6ee0b270 | 802 | #endif |
8808f00c AS |
803 | set_bit(port1, hub->change_bits); |
804 | ||
6ee0b270 AS |
805 | } else { |
806 | /* The power session is gone; tell khubd */ | |
807 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
808 | set_bit(port1, hub->change_bits); | |
5e6effae | 809 | } |
5e6effae AS |
810 | } |
811 | ||
948fea37 AS |
812 | /* If no port-status-change flags were set, we don't need any |
813 | * debouncing. If flags were set we can try to debounce the | |
814 | * ports all at once right now, instead of letting khubd do them | |
815 | * one at a time later on. | |
816 | * | |
817 | * If any port-status changes do occur during this delay, khubd | |
818 | * will see them later and handle them normally. | |
819 | */ | |
8520f380 AS |
820 | if (need_debounce_delay) { |
821 | delay = HUB_DEBOUNCE_STABLE; | |
822 | ||
823 | /* Don't do a long sleep inside a workqueue routine */ | |
824 | if (type == HUB_INIT2) { | |
825 | PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3); | |
826 | schedule_delayed_work(&hub->init_work, | |
827 | msecs_to_jiffies(delay)); | |
828 | return; /* Continues at init3: below */ | |
829 | } else { | |
830 | msleep(delay); | |
831 | } | |
832 | } | |
833 | init3: | |
f2835219 AS |
834 | hub->quiescing = 0; |
835 | ||
836 | status = usb_submit_urb(hub->urb, GFP_NOIO); | |
837 | if (status < 0) | |
838 | dev_err(hub->intfdev, "activate --> %d\n", status); | |
839 | if (hub->has_indicators && blinkenlights) | |
840 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); | |
841 | ||
842 | /* Scan all ports that need attention */ | |
843 | kick_khubd(hub); | |
8e4ceb38 AS |
844 | |
845 | /* Allow autosuspend if it was suppressed */ | |
846 | if (type <= HUB_INIT3) | |
847 | usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); | |
5e6effae AS |
848 | } |
849 | ||
8520f380 AS |
850 | /* Implement the continuations for the delays above */ |
851 | static void hub_init_func2(struct work_struct *ws) | |
852 | { | |
853 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
854 | ||
855 | hub_activate(hub, HUB_INIT2); | |
856 | } | |
857 | ||
858 | static void hub_init_func3(struct work_struct *ws) | |
859 | { | |
860 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
861 | ||
862 | hub_activate(hub, HUB_INIT3); | |
863 | } | |
864 | ||
4330354f AS |
865 | enum hub_quiescing_type { |
866 | HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND | |
867 | }; | |
868 | ||
869 | static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) | |
870 | { | |
871 | struct usb_device *hdev = hub->hdev; | |
872 | int i; | |
873 | ||
8520f380 AS |
874 | cancel_delayed_work_sync(&hub->init_work); |
875 | ||
4330354f AS |
876 | /* khubd and related activity won't re-trigger */ |
877 | hub->quiescing = 1; | |
878 | ||
879 | if (type != HUB_SUSPEND) { | |
880 | /* Disconnect all the children */ | |
881 | for (i = 0; i < hdev->maxchild; ++i) { | |
882 | if (hdev->children[i]) | |
883 | usb_disconnect(&hdev->children[i]); | |
884 | } | |
885 | } | |
886 | ||
887 | /* Stop khubd and related activity */ | |
888 | usb_kill_urb(hub->urb); | |
889 | if (hub->has_indicators) | |
890 | cancel_delayed_work_sync(&hub->leds); | |
891 | if (hub->tt.hub) | |
cb88a1b8 | 892 | cancel_work_sync(&hub->tt.clear_work); |
4330354f AS |
893 | } |
894 | ||
3eb14915 AS |
895 | /* caller has locked the hub device */ |
896 | static int hub_pre_reset(struct usb_interface *intf) | |
897 | { | |
898 | struct usb_hub *hub = usb_get_intfdata(intf); | |
899 | ||
4330354f | 900 | hub_quiesce(hub, HUB_PRE_RESET); |
f07600cf | 901 | return 0; |
7d069b7d AS |
902 | } |
903 | ||
904 | /* caller has locked the hub device */ | |
f07600cf | 905 | static int hub_post_reset(struct usb_interface *intf) |
7d069b7d | 906 | { |
7de18d8b AS |
907 | struct usb_hub *hub = usb_get_intfdata(intf); |
908 | ||
f2835219 | 909 | hub_activate(hub, HUB_POST_RESET); |
f07600cf | 910 | return 0; |
7d069b7d AS |
911 | } |
912 | ||
1da177e4 LT |
913 | static int hub_configure(struct usb_hub *hub, |
914 | struct usb_endpoint_descriptor *endpoint) | |
915 | { | |
b356b7c7 | 916 | struct usb_hcd *hcd; |
1da177e4 LT |
917 | struct usb_device *hdev = hub->hdev; |
918 | struct device *hub_dev = hub->intfdev; | |
919 | u16 hubstatus, hubchange; | |
74ad9bd2 | 920 | u16 wHubCharacteristics; |
1da177e4 LT |
921 | unsigned int pipe; |
922 | int maxp, ret; | |
7cbe5dca | 923 | char *message = "out of memory"; |
1da177e4 | 924 | |
d697cdda | 925 | hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); |
1da177e4 | 926 | if (!hub->buffer) { |
1da177e4 LT |
927 | ret = -ENOMEM; |
928 | goto fail; | |
929 | } | |
930 | ||
931 | hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); | |
932 | if (!hub->status) { | |
1da177e4 LT |
933 | ret = -ENOMEM; |
934 | goto fail; | |
935 | } | |
db90e7a1 | 936 | mutex_init(&hub->status_mutex); |
1da177e4 LT |
937 | |
938 | hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); | |
939 | if (!hub->descriptor) { | |
1da177e4 LT |
940 | ret = -ENOMEM; |
941 | goto fail; | |
942 | } | |
943 | ||
944 | /* Request the entire hub descriptor. | |
945 | * hub->descriptor can handle USB_MAXCHILDREN ports, | |
946 | * but the hub can/will return fewer bytes here. | |
947 | */ | |
948 | ret = get_hub_descriptor(hdev, hub->descriptor, | |
949 | sizeof(*hub->descriptor)); | |
950 | if (ret < 0) { | |
951 | message = "can't read hub descriptor"; | |
952 | goto fail; | |
953 | } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { | |
954 | message = "hub has too many ports!"; | |
955 | ret = -ENODEV; | |
956 | goto fail; | |
957 | } | |
958 | ||
959 | hdev->maxchild = hub->descriptor->bNbrPorts; | |
960 | dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, | |
961 | (hdev->maxchild == 1) ? "" : "s"); | |
962 | ||
7cbe5dca AS |
963 | hub->port_owners = kzalloc(hdev->maxchild * sizeof(void *), GFP_KERNEL); |
964 | if (!hub->port_owners) { | |
965 | ret = -ENOMEM; | |
966 | goto fail; | |
967 | } | |
968 | ||
74ad9bd2 | 969 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
1da177e4 | 970 | |
74ad9bd2 | 971 | if (wHubCharacteristics & HUB_CHAR_COMPOUND) { |
1da177e4 LT |
972 | int i; |
973 | char portstr [USB_MAXCHILDREN + 1]; | |
974 | ||
975 | for (i = 0; i < hdev->maxchild; i++) | |
976 | portstr[i] = hub->descriptor->DeviceRemovable | |
977 | [((i + 1) / 8)] & (1 << ((i + 1) % 8)) | |
978 | ? 'F' : 'R'; | |
979 | portstr[hdev->maxchild] = 0; | |
980 | dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); | |
981 | } else | |
982 | dev_dbg(hub_dev, "standalone hub\n"); | |
983 | ||
74ad9bd2 | 984 | switch (wHubCharacteristics & HUB_CHAR_LPSM) { |
1da177e4 LT |
985 | case 0x00: |
986 | dev_dbg(hub_dev, "ganged power switching\n"); | |
987 | break; | |
988 | case 0x01: | |
989 | dev_dbg(hub_dev, "individual port power switching\n"); | |
990 | break; | |
991 | case 0x02: | |
992 | case 0x03: | |
993 | dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); | |
994 | break; | |
995 | } | |
996 | ||
74ad9bd2 | 997 | switch (wHubCharacteristics & HUB_CHAR_OCPM) { |
1da177e4 LT |
998 | case 0x00: |
999 | dev_dbg(hub_dev, "global over-current protection\n"); | |
1000 | break; | |
1001 | case 0x08: | |
1002 | dev_dbg(hub_dev, "individual port over-current protection\n"); | |
1003 | break; | |
1004 | case 0x10: | |
1005 | case 0x18: | |
1006 | dev_dbg(hub_dev, "no over-current protection\n"); | |
1007 | break; | |
1008 | } | |
1009 | ||
1010 | spin_lock_init (&hub->tt.lock); | |
1011 | INIT_LIST_HEAD (&hub->tt.clear_list); | |
cb88a1b8 | 1012 | INIT_WORK(&hub->tt.clear_work, hub_tt_work); |
1da177e4 LT |
1013 | switch (hdev->descriptor.bDeviceProtocol) { |
1014 | case 0: | |
1015 | break; | |
1016 | case 1: | |
1017 | dev_dbg(hub_dev, "Single TT\n"); | |
1018 | hub->tt.hub = hdev; | |
1019 | break; | |
1020 | case 2: | |
1021 | ret = usb_set_interface(hdev, 0, 1); | |
1022 | if (ret == 0) { | |
1023 | dev_dbg(hub_dev, "TT per port\n"); | |
1024 | hub->tt.multi = 1; | |
1025 | } else | |
1026 | dev_err(hub_dev, "Using single TT (err %d)\n", | |
1027 | ret); | |
1028 | hub->tt.hub = hdev; | |
1029 | break; | |
d2e9b4d6 SS |
1030 | case 3: |
1031 | /* USB 3.0 hubs don't have a TT */ | |
1032 | break; | |
1da177e4 LT |
1033 | default: |
1034 | dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", | |
1035 | hdev->descriptor.bDeviceProtocol); | |
1036 | break; | |
1037 | } | |
1038 | ||
e09711ae | 1039 | /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ |
74ad9bd2 | 1040 | switch (wHubCharacteristics & HUB_CHAR_TTTT) { |
e09711ae DB |
1041 | case HUB_TTTT_8_BITS: |
1042 | if (hdev->descriptor.bDeviceProtocol != 0) { | |
1043 | hub->tt.think_time = 666; | |
1044 | dev_dbg(hub_dev, "TT requires at most %d " | |
1045 | "FS bit times (%d ns)\n", | |
1046 | 8, hub->tt.think_time); | |
1047 | } | |
1da177e4 | 1048 | break; |
e09711ae DB |
1049 | case HUB_TTTT_16_BITS: |
1050 | hub->tt.think_time = 666 * 2; | |
1051 | dev_dbg(hub_dev, "TT requires at most %d " | |
1052 | "FS bit times (%d ns)\n", | |
1053 | 16, hub->tt.think_time); | |
1da177e4 | 1054 | break; |
e09711ae DB |
1055 | case HUB_TTTT_24_BITS: |
1056 | hub->tt.think_time = 666 * 3; | |
1057 | dev_dbg(hub_dev, "TT requires at most %d " | |
1058 | "FS bit times (%d ns)\n", | |
1059 | 24, hub->tt.think_time); | |
1da177e4 | 1060 | break; |
e09711ae DB |
1061 | case HUB_TTTT_32_BITS: |
1062 | hub->tt.think_time = 666 * 4; | |
1063 | dev_dbg(hub_dev, "TT requires at most %d " | |
1064 | "FS bit times (%d ns)\n", | |
1065 | 32, hub->tt.think_time); | |
1da177e4 LT |
1066 | break; |
1067 | } | |
1068 | ||
1069 | /* probe() zeroes hub->indicator[] */ | |
74ad9bd2 | 1070 | if (wHubCharacteristics & HUB_CHAR_PORTIND) { |
1da177e4 LT |
1071 | hub->has_indicators = 1; |
1072 | dev_dbg(hub_dev, "Port indicators are supported\n"); | |
1073 | } | |
1074 | ||
1075 | dev_dbg(hub_dev, "power on to power good time: %dms\n", | |
1076 | hub->descriptor->bPwrOn2PwrGood * 2); | |
1077 | ||
1078 | /* power budgeting mostly matters with bus-powered hubs, | |
1079 | * and battery-powered root hubs (may provide just 8 mA). | |
1080 | */ | |
1081 | ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); | |
55c52718 | 1082 | if (ret < 2) { |
1da177e4 LT |
1083 | message = "can't get hub status"; |
1084 | goto fail; | |
1085 | } | |
7d35b929 AS |
1086 | le16_to_cpus(&hubstatus); |
1087 | if (hdev == hdev->bus->root_hub) { | |
55c52718 AS |
1088 | if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) |
1089 | hub->mA_per_port = 500; | |
1090 | else { | |
1091 | hub->mA_per_port = hdev->bus_mA; | |
1092 | hub->limited_power = 1; | |
1093 | } | |
7d35b929 | 1094 | } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
1da177e4 LT |
1095 | dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", |
1096 | hub->descriptor->bHubContrCurrent); | |
55c52718 AS |
1097 | hub->limited_power = 1; |
1098 | if (hdev->maxchild > 0) { | |
1099 | int remaining = hdev->bus_mA - | |
1100 | hub->descriptor->bHubContrCurrent; | |
1101 | ||
1102 | if (remaining < hdev->maxchild * 100) | |
1103 | dev_warn(hub_dev, | |
1104 | "insufficient power available " | |
1105 | "to use all downstream ports\n"); | |
1106 | hub->mA_per_port = 100; /* 7.2.1.1 */ | |
1107 | } | |
1108 | } else { /* Self-powered external hub */ | |
1109 | /* FIXME: What about battery-powered external hubs that | |
1110 | * provide less current per port? */ | |
1111 | hub->mA_per_port = 500; | |
7d35b929 | 1112 | } |
55c52718 AS |
1113 | if (hub->mA_per_port < 500) |
1114 | dev_dbg(hub_dev, "%umA bus power budget for each child\n", | |
1115 | hub->mA_per_port); | |
1da177e4 | 1116 | |
b356b7c7 SS |
1117 | /* Update the HCD's internal representation of this hub before khubd |
1118 | * starts getting port status changes for devices under the hub. | |
1119 | */ | |
1120 | hcd = bus_to_hcd(hdev->bus); | |
1121 | if (hcd->driver->update_hub_device) { | |
1122 | ret = hcd->driver->update_hub_device(hcd, hdev, | |
1123 | &hub->tt, GFP_KERNEL); | |
1124 | if (ret < 0) { | |
1125 | message = "can't update HCD hub info"; | |
1126 | goto fail; | |
1127 | } | |
1128 | } | |
1129 | ||
1da177e4 LT |
1130 | ret = hub_hub_status(hub, &hubstatus, &hubchange); |
1131 | if (ret < 0) { | |
1132 | message = "can't get hub status"; | |
1133 | goto fail; | |
1134 | } | |
1135 | ||
1136 | /* local power status reports aren't always correct */ | |
1137 | if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) | |
1138 | dev_dbg(hub_dev, "local power source is %s\n", | |
1139 | (hubstatus & HUB_STATUS_LOCAL_POWER) | |
1140 | ? "lost (inactive)" : "good"); | |
1141 | ||
74ad9bd2 | 1142 | if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) |
1da177e4 LT |
1143 | dev_dbg(hub_dev, "%sover-current condition exists\n", |
1144 | (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); | |
1145 | ||
88fafff9 | 1146 | /* set up the interrupt endpoint |
1147 | * We use the EP's maxpacket size instead of (PORTS+1+7)/8 | |
1148 | * bytes as USB2.0[11.12.3] says because some hubs are known | |
1149 | * to send more data (and thus cause overflow). For root hubs, | |
1150 | * maxpktsize is defined in hcd.c's fake endpoint descriptors | |
1151 | * to be big enough for at least USB_MAXCHILDREN ports. */ | |
1da177e4 LT |
1152 | pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); |
1153 | maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); | |
1154 | ||
1155 | if (maxp > sizeof(*hub->buffer)) | |
1156 | maxp = sizeof(*hub->buffer); | |
1157 | ||
1158 | hub->urb = usb_alloc_urb(0, GFP_KERNEL); | |
1159 | if (!hub->urb) { | |
1da177e4 LT |
1160 | ret = -ENOMEM; |
1161 | goto fail; | |
1162 | } | |
1163 | ||
1164 | usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, | |
1165 | hub, endpoint->bInterval); | |
1da177e4 LT |
1166 | |
1167 | /* maybe cycle the hub leds */ | |
1168 | if (hub->has_indicators && blinkenlights) | |
1169 | hub->indicator [0] = INDICATOR_CYCLE; | |
1170 | ||
f2835219 | 1171 | hub_activate(hub, HUB_INIT); |
1da177e4 LT |
1172 | return 0; |
1173 | ||
1174 | fail: | |
1175 | dev_err (hub_dev, "config failed, %s (err %d)\n", | |
1176 | message, ret); | |
1177 | /* hub_disconnect() frees urb and descriptor */ | |
1178 | return ret; | |
1179 | } | |
1180 | ||
e8054854 AS |
1181 | static void hub_release(struct kref *kref) |
1182 | { | |
1183 | struct usb_hub *hub = container_of(kref, struct usb_hub, kref); | |
1184 | ||
1185 | usb_put_intf(to_usb_interface(hub->intfdev)); | |
1186 | kfree(hub); | |
1187 | } | |
1188 | ||
1da177e4 LT |
1189 | static unsigned highspeed_hubs; |
1190 | ||
1191 | static void hub_disconnect(struct usb_interface *intf) | |
1192 | { | |
1193 | struct usb_hub *hub = usb_get_intfdata (intf); | |
e8054854 AS |
1194 | |
1195 | /* Take the hub off the event list and don't let it be added again */ | |
1196 | spin_lock_irq(&hub_event_lock); | |
8e4ceb38 AS |
1197 | if (!list_empty(&hub->event_list)) { |
1198 | list_del_init(&hub->event_list); | |
1199 | usb_autopm_put_interface_no_suspend(intf); | |
1200 | } | |
e8054854 AS |
1201 | hub->disconnected = 1; |
1202 | spin_unlock_irq(&hub_event_lock); | |
1da177e4 | 1203 | |
7de18d8b AS |
1204 | /* Disconnect all children and quiesce the hub */ |
1205 | hub->error = 0; | |
4330354f | 1206 | hub_quiesce(hub, HUB_DISCONNECT); |
7de18d8b | 1207 | |
8b28c752 | 1208 | usb_set_intfdata (intf, NULL); |
7cbe5dca | 1209 | hub->hdev->maxchild = 0; |
1da177e4 | 1210 | |
e8054854 | 1211 | if (hub->hdev->speed == USB_SPEED_HIGH) |
1da177e4 LT |
1212 | highspeed_hubs--; |
1213 | ||
1da177e4 | 1214 | usb_free_urb(hub->urb); |
7cbe5dca | 1215 | kfree(hub->port_owners); |
1bc3c9e1 | 1216 | kfree(hub->descriptor); |
1bc3c9e1 | 1217 | kfree(hub->status); |
d697cdda | 1218 | kfree(hub->buffer); |
1da177e4 | 1219 | |
e8054854 | 1220 | kref_put(&hub->kref, hub_release); |
1da177e4 LT |
1221 | } |
1222 | ||
1223 | static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
1224 | { | |
1225 | struct usb_host_interface *desc; | |
1226 | struct usb_endpoint_descriptor *endpoint; | |
1227 | struct usb_device *hdev; | |
1228 | struct usb_hub *hub; | |
1229 | ||
1230 | desc = intf->cur_altsetting; | |
1231 | hdev = interface_to_usbdev(intf); | |
1232 | ||
088f7fec AS |
1233 | /* Hubs have proper suspend/resume support */ |
1234 | usb_enable_autosuspend(hdev); | |
1235 | ||
38f3ad5e | 1236 | if (hdev->level == MAX_TOPO_LEVEL) { |
b9cef6c3 WF |
1237 | dev_err(&intf->dev, |
1238 | "Unsupported bus topology: hub nested too deep\n"); | |
38f3ad5e FB |
1239 | return -E2BIG; |
1240 | } | |
1241 | ||
89ccbdc9 DB |
1242 | #ifdef CONFIG_USB_OTG_BLACKLIST_HUB |
1243 | if (hdev->parent) { | |
1244 | dev_warn(&intf->dev, "ignoring external hub\n"); | |
1245 | return -ENODEV; | |
1246 | } | |
1247 | #endif | |
1248 | ||
1da177e4 LT |
1249 | /* Some hubs have a subclass of 1, which AFAICT according to the */ |
1250 | /* specs is not defined, but it works */ | |
1251 | if ((desc->desc.bInterfaceSubClass != 0) && | |
1252 | (desc->desc.bInterfaceSubClass != 1)) { | |
1253 | descriptor_error: | |
1254 | dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); | |
1255 | return -EIO; | |
1256 | } | |
1257 | ||
1258 | /* Multiple endpoints? What kind of mutant ninja-hub is this? */ | |
1259 | if (desc->desc.bNumEndpoints != 1) | |
1260 | goto descriptor_error; | |
1261 | ||
1262 | endpoint = &desc->endpoint[0].desc; | |
1263 | ||
fbf81c29 LFC |
1264 | /* If it's not an interrupt in endpoint, we'd better punt! */ |
1265 | if (!usb_endpoint_is_int_in(endpoint)) | |
1da177e4 LT |
1266 | goto descriptor_error; |
1267 | ||
1268 | /* We found a hub */ | |
1269 | dev_info (&intf->dev, "USB hub found\n"); | |
1270 | ||
0a1ef3b5 | 1271 | hub = kzalloc(sizeof(*hub), GFP_KERNEL); |
1da177e4 LT |
1272 | if (!hub) { |
1273 | dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); | |
1274 | return -ENOMEM; | |
1275 | } | |
1276 | ||
e8054854 | 1277 | kref_init(&hub->kref); |
1da177e4 LT |
1278 | INIT_LIST_HEAD(&hub->event_list); |
1279 | hub->intfdev = &intf->dev; | |
1280 | hub->hdev = hdev; | |
c4028958 | 1281 | INIT_DELAYED_WORK(&hub->leds, led_work); |
8520f380 | 1282 | INIT_DELAYED_WORK(&hub->init_work, NULL); |
e8054854 | 1283 | usb_get_intf(intf); |
1da177e4 LT |
1284 | |
1285 | usb_set_intfdata (intf, hub); | |
40f122f3 | 1286 | intf->needs_remote_wakeup = 1; |
1da177e4 LT |
1287 | |
1288 | if (hdev->speed == USB_SPEED_HIGH) | |
1289 | highspeed_hubs++; | |
1290 | ||
1291 | if (hub_configure(hub, endpoint) >= 0) | |
1292 | return 0; | |
1293 | ||
1294 | hub_disconnect (intf); | |
1295 | return -ENODEV; | |
1296 | } | |
1297 | ||
c532b29a | 1298 | /* No BKL needed */ |
1da177e4 LT |
1299 | static int |
1300 | hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) | |
1301 | { | |
1302 | struct usb_device *hdev = interface_to_usbdev (intf); | |
1303 | ||
1304 | /* assert ifno == 0 (part of hub spec) */ | |
1305 | switch (code) { | |
1306 | case USBDEVFS_HUB_PORTINFO: { | |
1307 | struct usbdevfs_hub_portinfo *info = user_data; | |
1308 | int i; | |
1309 | ||
1310 | spin_lock_irq(&device_state_lock); | |
1311 | if (hdev->devnum <= 0) | |
1312 | info->nports = 0; | |
1313 | else { | |
1314 | info->nports = hdev->maxchild; | |
1315 | for (i = 0; i < info->nports; i++) { | |
1316 | if (hdev->children[i] == NULL) | |
1317 | info->port[i] = 0; | |
1318 | else | |
1319 | info->port[i] = | |
1320 | hdev->children[i]->devnum; | |
1321 | } | |
1322 | } | |
1323 | spin_unlock_irq(&device_state_lock); | |
1324 | ||
1325 | return info->nports + 1; | |
1326 | } | |
1327 | ||
1328 | default: | |
1329 | return -ENOSYS; | |
1330 | } | |
1331 | } | |
1332 | ||
7cbe5dca AS |
1333 | /* |
1334 | * Allow user programs to claim ports on a hub. When a device is attached | |
1335 | * to one of these "claimed" ports, the program will "own" the device. | |
1336 | */ | |
1337 | static int find_port_owner(struct usb_device *hdev, unsigned port1, | |
1338 | void ***ppowner) | |
1339 | { | |
1340 | if (hdev->state == USB_STATE_NOTATTACHED) | |
1341 | return -ENODEV; | |
1342 | if (port1 == 0 || port1 > hdev->maxchild) | |
1343 | return -EINVAL; | |
1344 | ||
1345 | /* This assumes that devices not managed by the hub driver | |
1346 | * will always have maxchild equal to 0. | |
1347 | */ | |
1348 | *ppowner = &(hdev_to_hub(hdev)->port_owners[port1 - 1]); | |
1349 | return 0; | |
1350 | } | |
1351 | ||
1352 | /* In the following three functions, the caller must hold hdev's lock */ | |
1353 | int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, void *owner) | |
1354 | { | |
1355 | int rc; | |
1356 | void **powner; | |
1357 | ||
1358 | rc = find_port_owner(hdev, port1, &powner); | |
1359 | if (rc) | |
1360 | return rc; | |
1361 | if (*powner) | |
1362 | return -EBUSY; | |
1363 | *powner = owner; | |
1364 | return rc; | |
1365 | } | |
1366 | ||
1367 | int usb_hub_release_port(struct usb_device *hdev, unsigned port1, void *owner) | |
1368 | { | |
1369 | int rc; | |
1370 | void **powner; | |
1371 | ||
1372 | rc = find_port_owner(hdev, port1, &powner); | |
1373 | if (rc) | |
1374 | return rc; | |
1375 | if (*powner != owner) | |
1376 | return -ENOENT; | |
1377 | *powner = NULL; | |
1378 | return rc; | |
1379 | } | |
1380 | ||
1381 | void usb_hub_release_all_ports(struct usb_device *hdev, void *owner) | |
1382 | { | |
1383 | int n; | |
1384 | void **powner; | |
1385 | ||
1386 | n = find_port_owner(hdev, 1, &powner); | |
1387 | if (n == 0) { | |
1388 | for (; n < hdev->maxchild; (++n, ++powner)) { | |
1389 | if (*powner == owner) | |
1390 | *powner = NULL; | |
1391 | } | |
1392 | } | |
1393 | } | |
1394 | ||
1395 | /* The caller must hold udev's lock */ | |
1396 | bool usb_device_is_owned(struct usb_device *udev) | |
1397 | { | |
1398 | struct usb_hub *hub; | |
1399 | ||
1400 | if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) | |
1401 | return false; | |
1402 | hub = hdev_to_hub(udev->parent); | |
1403 | return !!hub->port_owners[udev->portnum - 1]; | |
1404 | } | |
1405 | ||
1da177e4 | 1406 | |
1da177e4 LT |
1407 | static void recursively_mark_NOTATTACHED(struct usb_device *udev) |
1408 | { | |
1409 | int i; | |
1410 | ||
1411 | for (i = 0; i < udev->maxchild; ++i) { | |
1412 | if (udev->children[i]) | |
1413 | recursively_mark_NOTATTACHED(udev->children[i]); | |
1414 | } | |
9bbdf1e0 | 1415 | if (udev->state == USB_STATE_SUSPENDED) |
15123006 | 1416 | udev->active_duration -= jiffies; |
1da177e4 LT |
1417 | udev->state = USB_STATE_NOTATTACHED; |
1418 | } | |
1419 | ||
1420 | /** | |
1421 | * usb_set_device_state - change a device's current state (usbcore, hcds) | |
1422 | * @udev: pointer to device whose state should be changed | |
1423 | * @new_state: new state value to be stored | |
1424 | * | |
1425 | * udev->state is _not_ fully protected by the device lock. Although | |
1426 | * most transitions are made only while holding the lock, the state can | |
1427 | * can change to USB_STATE_NOTATTACHED at almost any time. This | |
1428 | * is so that devices can be marked as disconnected as soon as possible, | |
1429 | * without having to wait for any semaphores to be released. As a result, | |
1430 | * all changes to any device's state must be protected by the | |
1431 | * device_state_lock spinlock. | |
1432 | * | |
1433 | * Once a device has been added to the device tree, all changes to its state | |
1434 | * should be made using this routine. The state should _not_ be set directly. | |
1435 | * | |
1436 | * If udev->state is already USB_STATE_NOTATTACHED then no change is made. | |
1437 | * Otherwise udev->state is set to new_state, and if new_state is | |
1438 | * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set | |
1439 | * to USB_STATE_NOTATTACHED. | |
1440 | */ | |
1441 | void usb_set_device_state(struct usb_device *udev, | |
1442 | enum usb_device_state new_state) | |
1443 | { | |
1444 | unsigned long flags; | |
1445 | ||
1446 | spin_lock_irqsave(&device_state_lock, flags); | |
1447 | if (udev->state == USB_STATE_NOTATTACHED) | |
1448 | ; /* do nothing */ | |
b94dc6b5 | 1449 | else if (new_state != USB_STATE_NOTATTACHED) { |
fb669cc0 DB |
1450 | |
1451 | /* root hub wakeup capabilities are managed out-of-band | |
1452 | * and may involve silicon errata ... ignore them here. | |
1453 | */ | |
1454 | if (udev->parent) { | |
645daaab AS |
1455 | if (udev->state == USB_STATE_SUSPENDED |
1456 | || new_state == USB_STATE_SUSPENDED) | |
1457 | ; /* No change to wakeup settings */ | |
1458 | else if (new_state == USB_STATE_CONFIGURED) | |
16985408 | 1459 | device_set_wakeup_capable(&udev->dev, |
fb669cc0 DB |
1460 | (udev->actconfig->desc.bmAttributes |
1461 | & USB_CONFIG_ATT_WAKEUP)); | |
645daaab | 1462 | else |
16985408 | 1463 | device_set_wakeup_capable(&udev->dev, 0); |
fb669cc0 | 1464 | } |
15123006 SS |
1465 | if (udev->state == USB_STATE_SUSPENDED && |
1466 | new_state != USB_STATE_SUSPENDED) | |
1467 | udev->active_duration -= jiffies; | |
1468 | else if (new_state == USB_STATE_SUSPENDED && | |
1469 | udev->state != USB_STATE_SUSPENDED) | |
1470 | udev->active_duration += jiffies; | |
645daaab | 1471 | udev->state = new_state; |
b94dc6b5 | 1472 | } else |
1da177e4 LT |
1473 | recursively_mark_NOTATTACHED(udev); |
1474 | spin_unlock_irqrestore(&device_state_lock, flags); | |
1475 | } | |
6da9c990 | 1476 | EXPORT_SYMBOL_GPL(usb_set_device_state); |
1da177e4 | 1477 | |
8af548dc IPG |
1478 | /* |
1479 | * WUSB devices are simple: they have no hubs behind, so the mapping | |
1480 | * device <-> virtual port number becomes 1:1. Why? to simplify the | |
1481 | * life of the device connection logic in | |
1482 | * drivers/usb/wusbcore/devconnect.c. When we do the initial secret | |
1483 | * handshake we need to assign a temporary address in the unauthorized | |
1484 | * space. For simplicity we use the first virtual port number found to | |
1485 | * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] | |
1486 | * and that becomes it's address [X < 128] or its unauthorized address | |
1487 | * [X | 0x80]. | |
1488 | * | |
1489 | * We add 1 as an offset to the one-based USB-stack port number | |
1490 | * (zero-based wusb virtual port index) for two reasons: (a) dev addr | |
1491 | * 0 is reserved by USB for default address; (b) Linux's USB stack | |
1492 | * uses always #1 for the root hub of the controller. So USB stack's | |
1493 | * port #1, which is wusb virtual-port #0 has address #2. | |
c6515272 SS |
1494 | * |
1495 | * Devices connected under xHCI are not as simple. The host controller | |
1496 | * supports virtualization, so the hardware assigns device addresses and | |
1497 | * the HCD must setup data structures before issuing a set address | |
1498 | * command to the hardware. | |
8af548dc | 1499 | */ |
1da177e4 LT |
1500 | static void choose_address(struct usb_device *udev) |
1501 | { | |
1502 | int devnum; | |
1503 | struct usb_bus *bus = udev->bus; | |
1504 | ||
1505 | /* If khubd ever becomes multithreaded, this will need a lock */ | |
8af548dc IPG |
1506 | if (udev->wusb) { |
1507 | devnum = udev->portnum + 1; | |
1508 | BUG_ON(test_bit(devnum, bus->devmap.devicemap)); | |
1509 | } else { | |
1510 | /* Try to allocate the next devnum beginning at | |
1511 | * bus->devnum_next. */ | |
1512 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, | |
1513 | bus->devnum_next); | |
1514 | if (devnum >= 128) | |
1515 | devnum = find_next_zero_bit(bus->devmap.devicemap, | |
1516 | 128, 1); | |
1517 | bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); | |
1518 | } | |
1da177e4 LT |
1519 | if (devnum < 128) { |
1520 | set_bit(devnum, bus->devmap.devicemap); | |
1521 | udev->devnum = devnum; | |
1522 | } | |
1523 | } | |
1524 | ||
1525 | static void release_address(struct usb_device *udev) | |
1526 | { | |
1527 | if (udev->devnum > 0) { | |
1528 | clear_bit(udev->devnum, udev->bus->devmap.devicemap); | |
1529 | udev->devnum = -1; | |
1530 | } | |
1531 | } | |
1532 | ||
4953d141 DV |
1533 | static void update_address(struct usb_device *udev, int devnum) |
1534 | { | |
1535 | /* The address for a WUSB device is managed by wusbcore. */ | |
1536 | if (!udev->wusb) | |
1537 | udev->devnum = devnum; | |
1538 | } | |
1539 | ||
f7410ced HX |
1540 | static void hub_free_dev(struct usb_device *udev) |
1541 | { | |
1542 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
1543 | ||
1544 | /* Root hubs aren't real devices, so don't free HCD resources */ | |
1545 | if (hcd->driver->free_dev && udev->parent) | |
1546 | hcd->driver->free_dev(hcd, udev); | |
1547 | } | |
1548 | ||
1da177e4 LT |
1549 | /** |
1550 | * usb_disconnect - disconnect a device (usbcore-internal) | |
1551 | * @pdev: pointer to device being disconnected | |
1552 | * Context: !in_interrupt () | |
1553 | * | |
1554 | * Something got disconnected. Get rid of it and all of its children. | |
1555 | * | |
1556 | * If *pdev is a normal device then the parent hub must already be locked. | |
1557 | * If *pdev is a root hub then this routine will acquire the | |
1558 | * usb_bus_list_lock on behalf of the caller. | |
1559 | * | |
1560 | * Only hub drivers (including virtual root hub drivers for host | |
1561 | * controllers) should ever call this. | |
1562 | * | |
1563 | * This call is synchronous, and may not be used in an interrupt context. | |
1564 | */ | |
1565 | void usb_disconnect(struct usb_device **pdev) | |
1566 | { | |
1567 | struct usb_device *udev = *pdev; | |
1568 | int i; | |
1569 | ||
1570 | if (!udev) { | |
441b62c1 | 1571 | pr_debug ("%s nodev\n", __func__); |
1da177e4 LT |
1572 | return; |
1573 | } | |
1574 | ||
1575 | /* mark the device as inactive, so any further urb submissions for | |
1576 | * this device (and any of its children) will fail immediately. | |
1577 | * this quiesces everyting except pending urbs. | |
1578 | */ | |
1579 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
1da177e4 LT |
1580 | dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum); |
1581 | ||
9ad3d6cc AS |
1582 | usb_lock_device(udev); |
1583 | ||
1da177e4 LT |
1584 | /* Free up all the children before we remove this device */ |
1585 | for (i = 0; i < USB_MAXCHILDREN; i++) { | |
1586 | if (udev->children[i]) | |
1587 | usb_disconnect(&udev->children[i]); | |
1588 | } | |
1589 | ||
1590 | /* deallocate hcd/hardware state ... nuking all pending urbs and | |
1591 | * cleaning up all state associated with the current configuration | |
1592 | * so that the hardware is now fully quiesced. | |
1593 | */ | |
782da727 | 1594 | dev_dbg (&udev->dev, "unregistering device\n"); |
1da177e4 | 1595 | usb_disable_device(udev, 0); |
cde217a5 | 1596 | usb_hcd_synchronize_unlinks(udev); |
1da177e4 | 1597 | |
3b23dd6f | 1598 | usb_remove_ep_devs(&udev->ep0); |
782da727 AS |
1599 | usb_unlock_device(udev); |
1600 | ||
1601 | /* Unregister the device. The device driver is responsible | |
3b23dd6f AS |
1602 | * for de-configuring the device and invoking the remove-device |
1603 | * notifier chain (used by usbfs and possibly others). | |
782da727 AS |
1604 | */ |
1605 | device_del(&udev->dev); | |
3099e75a | 1606 | |
782da727 | 1607 | /* Free the device number and delete the parent's children[] |
1da177e4 LT |
1608 | * (or root_hub) pointer. |
1609 | */ | |
1da177e4 | 1610 | release_address(udev); |
1da177e4 LT |
1611 | |
1612 | /* Avoid races with recursively_mark_NOTATTACHED() */ | |
1613 | spin_lock_irq(&device_state_lock); | |
1614 | *pdev = NULL; | |
1615 | spin_unlock_irq(&device_state_lock); | |
1616 | ||
f7410ced HX |
1617 | hub_free_dev(udev); |
1618 | ||
782da727 | 1619 | put_device(&udev->dev); |
1da177e4 LT |
1620 | } |
1621 | ||
f2a383e4 | 1622 | #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES |
1da177e4 LT |
1623 | static void show_string(struct usb_device *udev, char *id, char *string) |
1624 | { | |
1625 | if (!string) | |
1626 | return; | |
1627 | dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); | |
1628 | } | |
1629 | ||
f2a383e4 GKH |
1630 | static void announce_device(struct usb_device *udev) |
1631 | { | |
1632 | dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", | |
1633 | le16_to_cpu(udev->descriptor.idVendor), | |
1634 | le16_to_cpu(udev->descriptor.idProduct)); | |
b9cef6c3 WF |
1635 | dev_info(&udev->dev, |
1636 | "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", | |
f2a383e4 GKH |
1637 | udev->descriptor.iManufacturer, |
1638 | udev->descriptor.iProduct, | |
1639 | udev->descriptor.iSerialNumber); | |
1640 | show_string(udev, "Product", udev->product); | |
1641 | show_string(udev, "Manufacturer", udev->manufacturer); | |
1642 | show_string(udev, "SerialNumber", udev->serial); | |
1643 | } | |
1da177e4 | 1644 | #else |
f2a383e4 | 1645 | static inline void announce_device(struct usb_device *udev) { } |
1da177e4 LT |
1646 | #endif |
1647 | ||
1da177e4 LT |
1648 | #ifdef CONFIG_USB_OTG |
1649 | #include "otg_whitelist.h" | |
1650 | #endif | |
1651 | ||
3ede760f | 1652 | /** |
8d8558d1 | 1653 | * usb_enumerate_device_otg - FIXME (usbcore-internal) |
3ede760f ON |
1654 | * @udev: newly addressed device (in ADDRESS state) |
1655 | * | |
8d8558d1 | 1656 | * Finish enumeration for On-The-Go devices |
3ede760f | 1657 | */ |
8d8558d1 | 1658 | static int usb_enumerate_device_otg(struct usb_device *udev) |
1da177e4 | 1659 | { |
d9d16e8a | 1660 | int err = 0; |
1da177e4 LT |
1661 | |
1662 | #ifdef CONFIG_USB_OTG | |
1663 | /* | |
1664 | * OTG-aware devices on OTG-capable root hubs may be able to use SRP, | |
1665 | * to wake us after we've powered off VBUS; and HNP, switching roles | |
1666 | * "host" to "peripheral". The OTG descriptor helps figure this out. | |
1667 | */ | |
1668 | if (!udev->bus->is_b_host | |
1669 | && udev->config | |
1670 | && udev->parent == udev->bus->root_hub) { | |
2eb5052e | 1671 | struct usb_otg_descriptor *desc = NULL; |
1da177e4 LT |
1672 | struct usb_bus *bus = udev->bus; |
1673 | ||
1674 | /* descriptor may appear anywhere in config */ | |
1675 | if (__usb_get_extra_descriptor (udev->rawdescriptors[0], | |
1676 | le16_to_cpu(udev->config[0].desc.wTotalLength), | |
1677 | USB_DT_OTG, (void **) &desc) == 0) { | |
1678 | if (desc->bmAttributes & USB_OTG_HNP) { | |
12c3da34 | 1679 | unsigned port1 = udev->portnum; |
fc849b85 | 1680 | |
1da177e4 LT |
1681 | dev_info(&udev->dev, |
1682 | "Dual-Role OTG device on %sHNP port\n", | |
1683 | (port1 == bus->otg_port) | |
1684 | ? "" : "non-"); | |
1685 | ||
1686 | /* enable HNP before suspend, it's simpler */ | |
1687 | if (port1 == bus->otg_port) | |
1688 | bus->b_hnp_enable = 1; | |
1689 | err = usb_control_msg(udev, | |
1690 | usb_sndctrlpipe(udev, 0), | |
1691 | USB_REQ_SET_FEATURE, 0, | |
1692 | bus->b_hnp_enable | |
1693 | ? USB_DEVICE_B_HNP_ENABLE | |
1694 | : USB_DEVICE_A_ALT_HNP_SUPPORT, | |
1695 | 0, NULL, 0, USB_CTRL_SET_TIMEOUT); | |
1696 | if (err < 0) { | |
1697 | /* OTG MESSAGE: report errors here, | |
1698 | * customize to match your product. | |
1699 | */ | |
1700 | dev_info(&udev->dev, | |
b9cef6c3 | 1701 | "can't set HNP mode: %d\n", |
1da177e4 LT |
1702 | err); |
1703 | bus->b_hnp_enable = 0; | |
1704 | } | |
1705 | } | |
1706 | } | |
1707 | } | |
1708 | ||
1709 | if (!is_targeted(udev)) { | |
1710 | ||
1711 | /* Maybe it can talk to us, though we can't talk to it. | |
1712 | * (Includes HNP test device.) | |
1713 | */ | |
1714 | if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { | |
634a84f8 | 1715 | err = usb_port_suspend(udev, PMSG_SUSPEND); |
1da177e4 LT |
1716 | if (err < 0) |
1717 | dev_dbg(&udev->dev, "HNP fail, %d\n", err); | |
1718 | } | |
ffcdc18d | 1719 | err = -ENOTSUPP; |
1da177e4 LT |
1720 | goto fail; |
1721 | } | |
d9d16e8a | 1722 | fail: |
1da177e4 | 1723 | #endif |
d9d16e8a IPG |
1724 | return err; |
1725 | } | |
1726 | ||
1727 | ||
1728 | /** | |
8d8558d1 | 1729 | * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) |
d9d16e8a IPG |
1730 | * @udev: newly addressed device (in ADDRESS state) |
1731 | * | |
1732 | * This is only called by usb_new_device() and usb_authorize_device() | |
1733 | * and FIXME -- all comments that apply to them apply here wrt to | |
1734 | * environment. | |
1735 | * | |
1736 | * If the device is WUSB and not authorized, we don't attempt to read | |
1737 | * the string descriptors, as they will be errored out by the device | |
1738 | * until it has been authorized. | |
1739 | */ | |
8d8558d1 | 1740 | static int usb_enumerate_device(struct usb_device *udev) |
d9d16e8a IPG |
1741 | { |
1742 | int err; | |
1da177e4 | 1743 | |
d9d16e8a IPG |
1744 | if (udev->config == NULL) { |
1745 | err = usb_get_configuration(udev); | |
1746 | if (err < 0) { | |
1747 | dev_err(&udev->dev, "can't read configurations, error %d\n", | |
1748 | err); | |
1749 | goto fail; | |
1750 | } | |
1751 | } | |
1752 | if (udev->wusb == 1 && udev->authorized == 0) { | |
1753 | udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1754 | udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1755 | udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1756 | } | |
1757 | else { | |
1758 | /* read the standard strings and cache them if present */ | |
1759 | udev->product = usb_cache_string(udev, udev->descriptor.iProduct); | |
1760 | udev->manufacturer = usb_cache_string(udev, | |
1761 | udev->descriptor.iManufacturer); | |
1762 | udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); | |
1763 | } | |
8d8558d1 | 1764 | err = usb_enumerate_device_otg(udev); |
d9d16e8a IPG |
1765 | fail: |
1766 | return err; | |
1767 | } | |
1768 | ||
1769 | ||
1770 | /** | |
1771 | * usb_new_device - perform initial device setup (usbcore-internal) | |
1772 | * @udev: newly addressed device (in ADDRESS state) | |
1773 | * | |
8d8558d1 AS |
1774 | * This is called with devices which have been detected but not fully |
1775 | * enumerated. The device descriptor is available, but not descriptors | |
d9d16e8a IPG |
1776 | * for any device configuration. The caller must have locked either |
1777 | * the parent hub (if udev is a normal device) or else the | |
1778 | * usb_bus_list_lock (if udev is a root hub). The parent's pointer to | |
1779 | * udev has already been installed, but udev is not yet visible through | |
1780 | * sysfs or other filesystem code. | |
1781 | * | |
1782 | * It will return if the device is configured properly or not. Zero if | |
1783 | * the interface was registered with the driver core; else a negative | |
1784 | * errno value. | |
1785 | * | |
1786 | * This call is synchronous, and may not be used in an interrupt context. | |
1787 | * | |
1788 | * Only the hub driver or root-hub registrar should ever call this. | |
1789 | */ | |
1790 | int usb_new_device(struct usb_device *udev) | |
1791 | { | |
1792 | int err; | |
1793 | ||
16985408 | 1794 | if (udev->parent) { |
16985408 DS |
1795 | /* Initialize non-root-hub device wakeup to disabled; |
1796 | * device (un)configuration controls wakeup capable | |
1797 | * sysfs power/wakeup controls wakeup enabled/disabled | |
1798 | */ | |
1799 | device_init_wakeup(&udev->dev, 0); | |
16985408 DS |
1800 | } |
1801 | ||
9bbdf1e0 AS |
1802 | /* Tell the runtime-PM framework the device is active */ |
1803 | pm_runtime_set_active(&udev->dev); | |
1804 | pm_runtime_enable(&udev->dev); | |
1805 | ||
8d8558d1 | 1806 | err = usb_enumerate_device(udev); /* Read descriptors */ |
d9d16e8a IPG |
1807 | if (err < 0) |
1808 | goto fail; | |
c6515272 SS |
1809 | dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", |
1810 | udev->devnum, udev->bus->busnum, | |
1811 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
9f8b17e6 KS |
1812 | /* export the usbdev device-node for libusb */ |
1813 | udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, | |
1814 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
1815 | ||
6cd13201 AS |
1816 | /* Tell the world! */ |
1817 | announce_device(udev); | |
195af2cc | 1818 | |
927bc916 | 1819 | device_enable_async_suspend(&udev->dev); |
782da727 | 1820 | /* Register the device. The device driver is responsible |
3b23dd6f AS |
1821 | * for configuring the device and invoking the add-device |
1822 | * notifier chain (used by usbfs and possibly others). | |
782da727 | 1823 | */ |
9f8b17e6 | 1824 | err = device_add(&udev->dev); |
1da177e4 LT |
1825 | if (err) { |
1826 | dev_err(&udev->dev, "can't device_add, error %d\n", err); | |
1827 | goto fail; | |
1828 | } | |
9ad3d6cc | 1829 | |
3b23dd6f | 1830 | (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); |
c066475e | 1831 | return err; |
1da177e4 LT |
1832 | |
1833 | fail: | |
1834 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
9bbdf1e0 AS |
1835 | pm_runtime_disable(&udev->dev); |
1836 | pm_runtime_set_suspended(&udev->dev); | |
d9d16e8a | 1837 | return err; |
1da177e4 LT |
1838 | } |
1839 | ||
93993a0a IPG |
1840 | |
1841 | /** | |
fd39c86b RD |
1842 | * usb_deauthorize_device - deauthorize a device (usbcore-internal) |
1843 | * @usb_dev: USB device | |
1844 | * | |
1845 | * Move the USB device to a very basic state where interfaces are disabled | |
1846 | * and the device is in fact unconfigured and unusable. | |
93993a0a IPG |
1847 | * |
1848 | * We share a lock (that we have) with device_del(), so we need to | |
1849 | * defer its call. | |
1850 | */ | |
1851 | int usb_deauthorize_device(struct usb_device *usb_dev) | |
1852 | { | |
93993a0a IPG |
1853 | usb_lock_device(usb_dev); |
1854 | if (usb_dev->authorized == 0) | |
1855 | goto out_unauthorized; | |
da307123 | 1856 | |
93993a0a IPG |
1857 | usb_dev->authorized = 0; |
1858 | usb_set_configuration(usb_dev, -1); | |
da307123 AS |
1859 | |
1860 | kfree(usb_dev->product); | |
93993a0a | 1861 | usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
da307123 | 1862 | kfree(usb_dev->manufacturer); |
93993a0a | 1863 | usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
da307123 | 1864 | kfree(usb_dev->serial); |
93993a0a | 1865 | usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
da307123 AS |
1866 | |
1867 | usb_destroy_configuration(usb_dev); | |
93993a0a | 1868 | usb_dev->descriptor.bNumConfigurations = 0; |
da307123 | 1869 | |
93993a0a IPG |
1870 | out_unauthorized: |
1871 | usb_unlock_device(usb_dev); | |
1872 | return 0; | |
1873 | } | |
1874 | ||
1875 | ||
1876 | int usb_authorize_device(struct usb_device *usb_dev) | |
1877 | { | |
1878 | int result = 0, c; | |
da307123 | 1879 | |
93993a0a IPG |
1880 | usb_lock_device(usb_dev); |
1881 | if (usb_dev->authorized == 1) | |
1882 | goto out_authorized; | |
da307123 | 1883 | |
93993a0a IPG |
1884 | result = usb_autoresume_device(usb_dev); |
1885 | if (result < 0) { | |
1886 | dev_err(&usb_dev->dev, | |
1887 | "can't autoresume for authorization: %d\n", result); | |
1888 | goto error_autoresume; | |
1889 | } | |
1890 | result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); | |
1891 | if (result < 0) { | |
1892 | dev_err(&usb_dev->dev, "can't re-read device descriptor for " | |
1893 | "authorization: %d\n", result); | |
1894 | goto error_device_descriptor; | |
1895 | } | |
da307123 AS |
1896 | |
1897 | kfree(usb_dev->product); | |
1898 | usb_dev->product = NULL; | |
1899 | kfree(usb_dev->manufacturer); | |
1900 | usb_dev->manufacturer = NULL; | |
1901 | kfree(usb_dev->serial); | |
1902 | usb_dev->serial = NULL; | |
1903 | ||
93993a0a | 1904 | usb_dev->authorized = 1; |
8d8558d1 | 1905 | result = usb_enumerate_device(usb_dev); |
93993a0a | 1906 | if (result < 0) |
8d8558d1 | 1907 | goto error_enumerate; |
93993a0a IPG |
1908 | /* Choose and set the configuration. This registers the interfaces |
1909 | * with the driver core and lets interface drivers bind to them. | |
1910 | */ | |
b5ea060f | 1911 | c = usb_choose_configuration(usb_dev); |
93993a0a IPG |
1912 | if (c >= 0) { |
1913 | result = usb_set_configuration(usb_dev, c); | |
1914 | if (result) { | |
1915 | dev_err(&usb_dev->dev, | |
1916 | "can't set config #%d, error %d\n", c, result); | |
1917 | /* This need not be fatal. The user can try to | |
1918 | * set other configurations. */ | |
1919 | } | |
1920 | } | |
1921 | dev_info(&usb_dev->dev, "authorized to connect\n"); | |
da307123 | 1922 | |
8d8558d1 | 1923 | error_enumerate: |
93993a0a | 1924 | error_device_descriptor: |
da307123 | 1925 | usb_autosuspend_device(usb_dev); |
93993a0a IPG |
1926 | error_autoresume: |
1927 | out_authorized: | |
1928 | usb_unlock_device(usb_dev); // complements locktree | |
1929 | return result; | |
1930 | } | |
1931 | ||
1932 | ||
0165de09 IPG |
1933 | /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ |
1934 | static unsigned hub_is_wusb(struct usb_hub *hub) | |
1935 | { | |
1936 | struct usb_hcd *hcd; | |
1937 | if (hub->hdev->parent != NULL) /* not a root hub? */ | |
1938 | return 0; | |
1939 | hcd = container_of(hub->hdev->bus, struct usb_hcd, self); | |
1940 | return hcd->wireless; | |
1941 | } | |
1942 | ||
1943 | ||
1da177e4 LT |
1944 | #define PORT_RESET_TRIES 5 |
1945 | #define SET_ADDRESS_TRIES 2 | |
1946 | #define GET_DESCRIPTOR_TRIES 2 | |
1947 | #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) | |
1948 | #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) | |
1949 | ||
1950 | #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ | |
1951 | #define HUB_SHORT_RESET_TIME 10 | |
1952 | #define HUB_LONG_RESET_TIME 200 | |
1953 | #define HUB_RESET_TIMEOUT 500 | |
1954 | ||
1955 | static int hub_port_wait_reset(struct usb_hub *hub, int port1, | |
1956 | struct usb_device *udev, unsigned int delay) | |
1957 | { | |
1958 | int delay_time, ret; | |
1959 | u16 portstatus; | |
1960 | u16 portchange; | |
1961 | ||
1962 | for (delay_time = 0; | |
1963 | delay_time < HUB_RESET_TIMEOUT; | |
1964 | delay_time += delay) { | |
1965 | /* wait to give the device a chance to reset */ | |
1966 | msleep(delay); | |
1967 | ||
1968 | /* read and decode port status */ | |
1969 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
1970 | if (ret < 0) | |
1971 | return ret; | |
1972 | ||
1973 | /* Device went away? */ | |
1974 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) | |
1975 | return -ENOTCONN; | |
1976 | ||
dd4dd19e | 1977 | /* bomb out completely if the connection bounced */ |
1da177e4 | 1978 | if ((portchange & USB_PORT_STAT_C_CONNECTION)) |
dd4dd19e | 1979 | return -ENOTCONN; |
1da177e4 LT |
1980 | |
1981 | /* if we`ve finished resetting, then break out of the loop */ | |
1982 | if (!(portstatus & USB_PORT_STAT_RESET) && | |
1983 | (portstatus & USB_PORT_STAT_ENABLE)) { | |
0165de09 | 1984 | if (hub_is_wusb(hub)) |
551cdbbe | 1985 | udev->speed = USB_SPEED_WIRELESS; |
809cd1cb SS |
1986 | else if (portstatus & USB_PORT_STAT_SUPER_SPEED) |
1987 | udev->speed = USB_SPEED_SUPER; | |
0165de09 | 1988 | else if (portstatus & USB_PORT_STAT_HIGH_SPEED) |
1da177e4 LT |
1989 | udev->speed = USB_SPEED_HIGH; |
1990 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) | |
1991 | udev->speed = USB_SPEED_LOW; | |
1992 | else | |
1993 | udev->speed = USB_SPEED_FULL; | |
1994 | return 0; | |
1995 | } | |
1996 | ||
1997 | /* switch to the long delay after two short delay failures */ | |
1998 | if (delay_time >= 2 * HUB_SHORT_RESET_TIME) | |
1999 | delay = HUB_LONG_RESET_TIME; | |
2000 | ||
2001 | dev_dbg (hub->intfdev, | |
2002 | "port %d not reset yet, waiting %dms\n", | |
2003 | port1, delay); | |
2004 | } | |
2005 | ||
2006 | return -EBUSY; | |
2007 | } | |
2008 | ||
2009 | static int hub_port_reset(struct usb_hub *hub, int port1, | |
2010 | struct usb_device *udev, unsigned int delay) | |
2011 | { | |
2012 | int i, status; | |
a5f0efab | 2013 | struct usb_hcd *hcd; |
1da177e4 | 2014 | |
a5f0efab | 2015 | hcd = bus_to_hcd(udev->bus); |
32fe0198 AS |
2016 | /* Block EHCI CF initialization during the port reset. |
2017 | * Some companion controllers don't like it when they mix. | |
2018 | */ | |
2019 | down_read(&ehci_cf_port_reset_rwsem); | |
2020 | ||
1da177e4 LT |
2021 | /* Reset the port */ |
2022 | for (i = 0; i < PORT_RESET_TRIES; i++) { | |
2023 | status = set_port_feature(hub->hdev, | |
2024 | port1, USB_PORT_FEAT_RESET); | |
2025 | if (status) | |
2026 | dev_err(hub->intfdev, | |
2027 | "cannot reset port %d (err = %d)\n", | |
2028 | port1, status); | |
2029 | else { | |
2030 | status = hub_port_wait_reset(hub, port1, udev, delay); | |
dd16525b | 2031 | if (status && status != -ENOTCONN) |
1da177e4 LT |
2032 | dev_dbg(hub->intfdev, |
2033 | "port_wait_reset: err = %d\n", | |
2034 | status); | |
2035 | } | |
2036 | ||
2037 | /* return on disconnect or reset */ | |
2038 | switch (status) { | |
2039 | case 0: | |
b789696a DB |
2040 | /* TRSTRCY = 10 ms; plus some extra */ |
2041 | msleep(10 + 40); | |
4953d141 | 2042 | update_address(udev, 0); |
a5f0efab SS |
2043 | if (hcd->driver->reset_device) { |
2044 | status = hcd->driver->reset_device(hcd, udev); | |
2045 | if (status < 0) { | |
2046 | dev_err(&udev->dev, "Cannot reset " | |
2047 | "HCD device state\n"); | |
2048 | break; | |
2049 | } | |
2050 | } | |
1da177e4 LT |
2051 | /* FALL THROUGH */ |
2052 | case -ENOTCONN: | |
2053 | case -ENODEV: | |
2054 | clear_port_feature(hub->hdev, | |
2055 | port1, USB_PORT_FEAT_C_RESET); | |
2056 | /* FIXME need disconnect() for NOTATTACHED device */ | |
2057 | usb_set_device_state(udev, status | |
2058 | ? USB_STATE_NOTATTACHED | |
2059 | : USB_STATE_DEFAULT); | |
32fe0198 | 2060 | goto done; |
1da177e4 LT |
2061 | } |
2062 | ||
2063 | dev_dbg (hub->intfdev, | |
2064 | "port %d not enabled, trying reset again...\n", | |
2065 | port1); | |
2066 | delay = HUB_LONG_RESET_TIME; | |
2067 | } | |
2068 | ||
2069 | dev_err (hub->intfdev, | |
2070 | "Cannot enable port %i. Maybe the USB cable is bad?\n", | |
2071 | port1); | |
2072 | ||
32fe0198 AS |
2073 | done: |
2074 | up_read(&ehci_cf_port_reset_rwsem); | |
1da177e4 LT |
2075 | return status; |
2076 | } | |
2077 | ||
d388dab7 | 2078 | #ifdef CONFIG_PM |
1da177e4 | 2079 | |
b01b03f3 AS |
2080 | #define MASK_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION | \ |
2081 | USB_PORT_STAT_SUSPEND) | |
2082 | #define WANT_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION) | |
2083 | ||
2084 | /* Determine whether the device on a port is ready for a normal resume, | |
2085 | * is ready for a reset-resume, or should be disconnected. | |
2086 | */ | |
2087 | static int check_port_resume_type(struct usb_device *udev, | |
2088 | struct usb_hub *hub, int port1, | |
2089 | int status, unsigned portchange, unsigned portstatus) | |
2090 | { | |
2091 | /* Is the device still present? */ | |
2092 | if (status || (portstatus & MASK_BITS) != WANT_BITS) { | |
2093 | if (status >= 0) | |
2094 | status = -ENODEV; | |
2095 | } | |
2096 | ||
86c57edf AS |
2097 | /* Can't do a normal resume if the port isn't enabled, |
2098 | * so try a reset-resume instead. | |
2099 | */ | |
2100 | else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { | |
2101 | if (udev->persist_enabled) | |
2102 | udev->reset_resume = 1; | |
2103 | else | |
2104 | status = -ENODEV; | |
2105 | } | |
b01b03f3 AS |
2106 | |
2107 | if (status) { | |
2108 | dev_dbg(hub->intfdev, | |
2109 | "port %d status %04x.%04x after resume, %d\n", | |
2110 | port1, portchange, portstatus, status); | |
2111 | } else if (udev->reset_resume) { | |
2112 | ||
2113 | /* Late port handoff can set status-change bits */ | |
2114 | if (portchange & USB_PORT_STAT_C_CONNECTION) | |
2115 | clear_port_feature(hub->hdev, port1, | |
2116 | USB_PORT_FEAT_C_CONNECTION); | |
2117 | if (portchange & USB_PORT_STAT_C_ENABLE) | |
2118 | clear_port_feature(hub->hdev, port1, | |
2119 | USB_PORT_FEAT_C_ENABLE); | |
2120 | } | |
2121 | ||
2122 | return status; | |
2123 | } | |
2124 | ||
1da177e4 LT |
2125 | #ifdef CONFIG_USB_SUSPEND |
2126 | ||
2127 | /* | |
624d6c07 AS |
2128 | * usb_port_suspend - suspend a usb device's upstream port |
2129 | * @udev: device that's no longer in active use, not a root hub | |
2130 | * Context: must be able to sleep; device not locked; pm locks held | |
2131 | * | |
2132 | * Suspends a USB device that isn't in active use, conserving power. | |
2133 | * Devices may wake out of a suspend, if anything important happens, | |
2134 | * using the remote wakeup mechanism. They may also be taken out of | |
2135 | * suspend by the host, using usb_port_resume(). It's also routine | |
2136 | * to disconnect devices while they are suspended. | |
2137 | * | |
2138 | * This only affects the USB hardware for a device; its interfaces | |
2139 | * (and, for hubs, child devices) must already have been suspended. | |
2140 | * | |
1da177e4 LT |
2141 | * Selective port suspend reduces power; most suspended devices draw |
2142 | * less than 500 uA. It's also used in OTG, along with remote wakeup. | |
2143 | * All devices below the suspended port are also suspended. | |
2144 | * | |
2145 | * Devices leave suspend state when the host wakes them up. Some devices | |
2146 | * also support "remote wakeup", where the device can activate the USB | |
2147 | * tree above them to deliver data, such as a keypress or packet. In | |
2148 | * some cases, this wakes the USB host. | |
624d6c07 AS |
2149 | * |
2150 | * Suspending OTG devices may trigger HNP, if that's been enabled | |
2151 | * between a pair of dual-role devices. That will change roles, such | |
2152 | * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. | |
2153 | * | |
2154 | * Devices on USB hub ports have only one "suspend" state, corresponding | |
2155 | * to ACPI D2, "may cause the device to lose some context". | |
2156 | * State transitions include: | |
2157 | * | |
2158 | * - suspend, resume ... when the VBUS power link stays live | |
2159 | * - suspend, disconnect ... VBUS lost | |
2160 | * | |
2161 | * Once VBUS drop breaks the circuit, the port it's using has to go through | |
2162 | * normal re-enumeration procedures, starting with enabling VBUS power. | |
2163 | * Other than re-initializing the hub (plug/unplug, except for root hubs), | |
2164 | * Linux (2.6) currently has NO mechanisms to initiate that: no khubd | |
2165 | * timer, no SRP, no requests through sysfs. | |
2166 | * | |
2167 | * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when | |
2168 | * the root hub for their bus goes into global suspend ... so we don't | |
2169 | * (falsely) update the device power state to say it suspended. | |
2170 | * | |
2171 | * Returns 0 on success, else negative errno. | |
1da177e4 | 2172 | */ |
65bfd296 | 2173 | int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 2174 | { |
624d6c07 AS |
2175 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
2176 | int port1 = udev->portnum; | |
2177 | int status; | |
1da177e4 LT |
2178 | |
2179 | // dev_dbg(hub->intfdev, "suspend port %d\n", port1); | |
2180 | ||
2181 | /* enable remote wakeup when appropriate; this lets the device | |
2182 | * wake up the upstream hub (including maybe the root hub). | |
2183 | * | |
2184 | * NOTE: OTG devices may issue remote wakeup (or SRP) even when | |
2185 | * we don't explicitly enable it here. | |
2186 | */ | |
645daaab | 2187 | if (udev->do_remote_wakeup) { |
1da177e4 LT |
2188 | status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
2189 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
2190 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
2191 | NULL, 0, | |
2192 | USB_CTRL_SET_TIMEOUT); | |
0c487206 | 2193 | if (status) { |
624d6c07 AS |
2194 | dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", |
2195 | status); | |
0c487206 ON |
2196 | /* bail if autosuspend is requested */ |
2197 | if (msg.event & PM_EVENT_AUTO) | |
2198 | return status; | |
2199 | } | |
1da177e4 LT |
2200 | } |
2201 | ||
2202 | /* see 7.1.7.6 */ | |
2203 | status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); | |
2204 | if (status) { | |
624d6c07 AS |
2205 | dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", |
2206 | port1, status); | |
1da177e4 | 2207 | /* paranoia: "should not happen" */ |
0c487206 ON |
2208 | if (udev->do_remote_wakeup) |
2209 | (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
1da177e4 LT |
2210 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, |
2211 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
2212 | NULL, 0, | |
2213 | USB_CTRL_SET_TIMEOUT); | |
2214 | } else { | |
2215 | /* device has up to 10 msec to fully suspend */ | |
645daaab | 2216 | dev_dbg(&udev->dev, "usb %ssuspend\n", |
65bfd296 | 2217 | (msg.event & PM_EVENT_AUTO ? "auto-" : "")); |
1da177e4 LT |
2218 | usb_set_device_state(udev, USB_STATE_SUSPENDED); |
2219 | msleep(10); | |
2220 | } | |
2221 | return status; | |
2222 | } | |
2223 | ||
1da177e4 | 2224 | /* |
390a8c34 DB |
2225 | * If the USB "suspend" state is in use (rather than "global suspend"), |
2226 | * many devices will be individually taken out of suspend state using | |
54515fe5 | 2227 | * special "resume" signaling. This routine kicks in shortly after |
1da177e4 LT |
2228 | * hardware resume signaling is finished, either because of selective |
2229 | * resume (by host) or remote wakeup (by device) ... now see what changed | |
2230 | * in the tree that's rooted at this device. | |
54515fe5 AS |
2231 | * |
2232 | * If @udev->reset_resume is set then the device is reset before the | |
2233 | * status check is done. | |
1da177e4 | 2234 | */ |
140d8f68 | 2235 | static int finish_port_resume(struct usb_device *udev) |
1da177e4 | 2236 | { |
54515fe5 | 2237 | int status = 0; |
1da177e4 LT |
2238 | u16 devstatus; |
2239 | ||
2240 | /* caller owns the udev device lock */ | |
b9cef6c3 WF |
2241 | dev_dbg(&udev->dev, "%s\n", |
2242 | udev->reset_resume ? "finish reset-resume" : "finish resume"); | |
1da177e4 LT |
2243 | |
2244 | /* usb ch9 identifies four variants of SUSPENDED, based on what | |
2245 | * state the device resumes to. Linux currently won't see the | |
2246 | * first two on the host side; they'd be inside hub_port_init() | |
2247 | * during many timeouts, but khubd can't suspend until later. | |
2248 | */ | |
2249 | usb_set_device_state(udev, udev->actconfig | |
2250 | ? USB_STATE_CONFIGURED | |
2251 | : USB_STATE_ADDRESS); | |
1da177e4 | 2252 | |
54515fe5 AS |
2253 | /* 10.5.4.5 says not to reset a suspended port if the attached |
2254 | * device is enabled for remote wakeup. Hence the reset | |
2255 | * operation is carried out here, after the port has been | |
2256 | * resumed. | |
2257 | */ | |
2258 | if (udev->reset_resume) | |
86c57edf | 2259 | retry_reset_resume: |
742120c6 | 2260 | status = usb_reset_and_verify_device(udev); |
54515fe5 | 2261 | |
1da177e4 LT |
2262 | /* 10.5.4.5 says be sure devices in the tree are still there. |
2263 | * For now let's assume the device didn't go crazy on resume, | |
2264 | * and device drivers will know about any resume quirks. | |
2265 | */ | |
54515fe5 | 2266 | if (status == 0) { |
46dede46 | 2267 | devstatus = 0; |
54515fe5 AS |
2268 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); |
2269 | if (status >= 0) | |
46dede46 | 2270 | status = (status > 0 ? 0 : -ENODEV); |
86c57edf AS |
2271 | |
2272 | /* If a normal resume failed, try doing a reset-resume */ | |
2273 | if (status && !udev->reset_resume && udev->persist_enabled) { | |
2274 | dev_dbg(&udev->dev, "retry with reset-resume\n"); | |
2275 | udev->reset_resume = 1; | |
2276 | goto retry_reset_resume; | |
2277 | } | |
54515fe5 | 2278 | } |
b40b7a90 | 2279 | |
624d6c07 AS |
2280 | if (status) { |
2281 | dev_dbg(&udev->dev, "gone after usb resume? status %d\n", | |
2282 | status); | |
2283 | } else if (udev->actconfig) { | |
1da177e4 | 2284 | le16_to_cpus(&devstatus); |
686314cf | 2285 | if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) { |
1da177e4 LT |
2286 | status = usb_control_msg(udev, |
2287 | usb_sndctrlpipe(udev, 0), | |
2288 | USB_REQ_CLEAR_FEATURE, | |
2289 | USB_RECIP_DEVICE, | |
2290 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
2291 | NULL, 0, | |
2292 | USB_CTRL_SET_TIMEOUT); | |
a8e7c565 | 2293 | if (status) |
b9cef6c3 WF |
2294 | dev_dbg(&udev->dev, |
2295 | "disable remote wakeup, status %d\n", | |
2296 | status); | |
4bf0ba86 | 2297 | } |
1da177e4 | 2298 | status = 0; |
1da177e4 LT |
2299 | } |
2300 | return status; | |
2301 | } | |
2302 | ||
624d6c07 AS |
2303 | /* |
2304 | * usb_port_resume - re-activate a suspended usb device's upstream port | |
2305 | * @udev: device to re-activate, not a root hub | |
2306 | * Context: must be able to sleep; device not locked; pm locks held | |
2307 | * | |
2308 | * This will re-activate the suspended device, increasing power usage | |
2309 | * while letting drivers communicate again with its endpoints. | |
2310 | * USB resume explicitly guarantees that the power session between | |
2311 | * the host and the device is the same as it was when the device | |
2312 | * suspended. | |
2313 | * | |
feccc30d AS |
2314 | * If @udev->reset_resume is set then this routine won't check that the |
2315 | * port is still enabled. Furthermore, finish_port_resume() above will | |
54515fe5 AS |
2316 | * reset @udev. The end result is that a broken power session can be |
2317 | * recovered and @udev will appear to persist across a loss of VBUS power. | |
2318 | * | |
2319 | * For example, if a host controller doesn't maintain VBUS suspend current | |
2320 | * during a system sleep or is reset when the system wakes up, all the USB | |
2321 | * power sessions below it will be broken. This is especially troublesome | |
2322 | * for mass-storage devices containing mounted filesystems, since the | |
2323 | * device will appear to have disconnected and all the memory mappings | |
2324 | * to it will be lost. Using the USB_PERSIST facility, the device can be | |
2325 | * made to appear as if it had not disconnected. | |
2326 | * | |
742120c6 | 2327 | * This facility can be dangerous. Although usb_reset_and_verify_device() makes |
feccc30d | 2328 | * every effort to insure that the same device is present after the |
54515fe5 AS |
2329 | * reset as before, it cannot provide a 100% guarantee. Furthermore it's |
2330 | * quite possible for a device to remain unaltered but its media to be | |
2331 | * changed. If the user replaces a flash memory card while the system is | |
2332 | * asleep, he will have only himself to blame when the filesystem on the | |
2333 | * new card is corrupted and the system crashes. | |
2334 | * | |
624d6c07 AS |
2335 | * Returns 0 on success, else negative errno. |
2336 | */ | |
65bfd296 | 2337 | int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 2338 | { |
624d6c07 AS |
2339 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
2340 | int port1 = udev->portnum; | |
2341 | int status; | |
2342 | u16 portchange, portstatus; | |
d25450c6 AS |
2343 | |
2344 | /* Skip the initial Clear-Suspend step for a remote wakeup */ | |
2345 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
2346 | if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND)) | |
2347 | goto SuspendCleared; | |
1da177e4 LT |
2348 | |
2349 | // dev_dbg(hub->intfdev, "resume port %d\n", port1); | |
2350 | ||
d5cbad4b AS |
2351 | set_bit(port1, hub->busy_bits); |
2352 | ||
1da177e4 LT |
2353 | /* see 7.1.7.7; affects power usage, but not budgeting */ |
2354 | status = clear_port_feature(hub->hdev, | |
2355 | port1, USB_PORT_FEAT_SUSPEND); | |
2356 | if (status) { | |
624d6c07 AS |
2357 | dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", |
2358 | port1, status); | |
1da177e4 | 2359 | } else { |
1da177e4 | 2360 | /* drive resume for at least 20 msec */ |
686314cf | 2361 | dev_dbg(&udev->dev, "usb %sresume\n", |
65bfd296 | 2362 | (msg.event & PM_EVENT_AUTO ? "auto-" : "")); |
1da177e4 LT |
2363 | msleep(25); |
2364 | ||
1da177e4 LT |
2365 | /* Virtual root hubs can trigger on GET_PORT_STATUS to |
2366 | * stop resume signaling. Then finish the resume | |
2367 | * sequence. | |
2368 | */ | |
d25450c6 | 2369 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
54515fe5 | 2370 | |
b01b03f3 AS |
2371 | /* TRSMRCY = 10 msec */ |
2372 | msleep(10); | |
2373 | } | |
2374 | ||
54515fe5 | 2375 | SuspendCleared: |
b01b03f3 AS |
2376 | if (status == 0) { |
2377 | if (portchange & USB_PORT_STAT_C_SUSPEND) | |
2378 | clear_port_feature(hub->hdev, port1, | |
2379 | USB_PORT_FEAT_C_SUSPEND); | |
1da177e4 | 2380 | } |
1da177e4 | 2381 | |
d5cbad4b | 2382 | clear_bit(port1, hub->busy_bits); |
d5cbad4b | 2383 | |
b01b03f3 AS |
2384 | status = check_port_resume_type(udev, |
2385 | hub, port1, status, portchange, portstatus); | |
54515fe5 AS |
2386 | if (status == 0) |
2387 | status = finish_port_resume(udev); | |
2388 | if (status < 0) { | |
2389 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); | |
2390 | hub_port_logical_disconnect(hub, port1); | |
2391 | } | |
1da177e4 LT |
2392 | return status; |
2393 | } | |
2394 | ||
8808f00c | 2395 | /* caller has locked udev */ |
0534d468 | 2396 | int usb_remote_wakeup(struct usb_device *udev) |
1da177e4 LT |
2397 | { |
2398 | int status = 0; | |
2399 | ||
1da177e4 | 2400 | if (udev->state == USB_STATE_SUSPENDED) { |
645daaab | 2401 | dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); |
9bbdf1e0 AS |
2402 | status = usb_autoresume_device(udev); |
2403 | if (status == 0) { | |
2404 | /* Let the drivers do their thing, then... */ | |
2405 | usb_autosuspend_device(udev); | |
2406 | } | |
1da177e4 | 2407 | } |
1da177e4 LT |
2408 | return status; |
2409 | } | |
2410 | ||
d388dab7 AS |
2411 | #else /* CONFIG_USB_SUSPEND */ |
2412 | ||
2413 | /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ | |
2414 | ||
65bfd296 | 2415 | int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
d388dab7 AS |
2416 | { |
2417 | return 0; | |
2418 | } | |
2419 | ||
b01b03f3 AS |
2420 | /* However we may need to do a reset-resume */ |
2421 | ||
65bfd296 | 2422 | int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
d388dab7 | 2423 | { |
b01b03f3 AS |
2424 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
2425 | int port1 = udev->portnum; | |
2426 | int status; | |
2427 | u16 portchange, portstatus; | |
2428 | ||
2429 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
2430 | status = check_port_resume_type(udev, | |
2431 | hub, port1, status, portchange, portstatus); | |
54515fe5 | 2432 | |
b01b03f3 AS |
2433 | if (status) { |
2434 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); | |
2435 | hub_port_logical_disconnect(hub, port1); | |
2436 | } else if (udev->reset_resume) { | |
54515fe5 | 2437 | dev_dbg(&udev->dev, "reset-resume\n"); |
742120c6 | 2438 | status = usb_reset_and_verify_device(udev); |
54515fe5 AS |
2439 | } |
2440 | return status; | |
d388dab7 AS |
2441 | } |
2442 | ||
d388dab7 AS |
2443 | #endif |
2444 | ||
db690874 | 2445 | static int hub_suspend(struct usb_interface *intf, pm_message_t msg) |
1da177e4 LT |
2446 | { |
2447 | struct usb_hub *hub = usb_get_intfdata (intf); | |
2448 | struct usb_device *hdev = hub->hdev; | |
2449 | unsigned port1; | |
1da177e4 | 2450 | |
c9f89fa4 | 2451 | /* fail if children aren't already suspended */ |
1da177e4 LT |
2452 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
2453 | struct usb_device *udev; | |
2454 | ||
2455 | udev = hdev->children [port1-1]; | |
6840d255 | 2456 | if (udev && udev->can_submit) { |
65bfd296 | 2457 | if (!(msg.event & PM_EVENT_AUTO)) |
645daaab AS |
2458 | dev_dbg(&intf->dev, "port %d nyet suspended\n", |
2459 | port1); | |
c9f89fa4 DB |
2460 | return -EBUSY; |
2461 | } | |
1da177e4 LT |
2462 | } |
2463 | ||
441b62c1 | 2464 | dev_dbg(&intf->dev, "%s\n", __func__); |
40f122f3 | 2465 | |
12f1ff83 | 2466 | /* stop khubd and related activity */ |
4330354f | 2467 | hub_quiesce(hub, HUB_SUSPEND); |
b6f6436d | 2468 | return 0; |
1da177e4 LT |
2469 | } |
2470 | ||
2471 | static int hub_resume(struct usb_interface *intf) | |
2472 | { | |
5e6effae | 2473 | struct usb_hub *hub = usb_get_intfdata(intf); |
40f122f3 | 2474 | |
5e6effae | 2475 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 2476 | hub_activate(hub, HUB_RESUME); |
1da177e4 LT |
2477 | return 0; |
2478 | } | |
2479 | ||
b41a60ec | 2480 | static int hub_reset_resume(struct usb_interface *intf) |
f07600cf | 2481 | { |
b41a60ec | 2482 | struct usb_hub *hub = usb_get_intfdata(intf); |
f07600cf | 2483 | |
5e6effae | 2484 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 2485 | hub_activate(hub, HUB_RESET_RESUME); |
f07600cf AS |
2486 | return 0; |
2487 | } | |
2488 | ||
54515fe5 AS |
2489 | /** |
2490 | * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power | |
2491 | * @rhdev: struct usb_device for the root hub | |
2492 | * | |
2493 | * The USB host controller driver calls this function when its root hub | |
2494 | * is resumed and Vbus power has been interrupted or the controller | |
feccc30d AS |
2495 | * has been reset. The routine marks @rhdev as having lost power. |
2496 | * When the hub driver is resumed it will take notice and carry out | |
2497 | * power-session recovery for all the "USB-PERSIST"-enabled child devices; | |
2498 | * the others will be disconnected. | |
54515fe5 AS |
2499 | */ |
2500 | void usb_root_hub_lost_power(struct usb_device *rhdev) | |
2501 | { | |
2502 | dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); | |
2503 | rhdev->reset_resume = 1; | |
2504 | } | |
2505 | EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); | |
2506 | ||
d388dab7 AS |
2507 | #else /* CONFIG_PM */ |
2508 | ||
f07600cf AS |
2509 | #define hub_suspend NULL |
2510 | #define hub_resume NULL | |
2511 | #define hub_reset_resume NULL | |
d388dab7 AS |
2512 | #endif |
2513 | ||
1da177e4 LT |
2514 | |
2515 | /* USB 2.0 spec, 7.1.7.3 / fig 7-29: | |
2516 | * | |
2517 | * Between connect detection and reset signaling there must be a delay | |
2518 | * of 100ms at least for debounce and power-settling. The corresponding | |
2519 | * timer shall restart whenever the downstream port detects a disconnect. | |
2520 | * | |
2521 | * Apparently there are some bluetooth and irda-dongles and a number of | |
2522 | * low-speed devices for which this debounce period may last over a second. | |
2523 | * Not covered by the spec - but easy to deal with. | |
2524 | * | |
2525 | * This implementation uses a 1500ms total debounce timeout; if the | |
2526 | * connection isn't stable by then it returns -ETIMEDOUT. It checks | |
2527 | * every 25ms for transient disconnects. When the port status has been | |
2528 | * unchanged for 100ms it returns the port status. | |
2529 | */ | |
1da177e4 LT |
2530 | static int hub_port_debounce(struct usb_hub *hub, int port1) |
2531 | { | |
2532 | int ret; | |
2533 | int total_time, stable_time = 0; | |
2534 | u16 portchange, portstatus; | |
2535 | unsigned connection = 0xffff; | |
2536 | ||
2537 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { | |
2538 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
2539 | if (ret < 0) | |
2540 | return ret; | |
2541 | ||
2542 | if (!(portchange & USB_PORT_STAT_C_CONNECTION) && | |
2543 | (portstatus & USB_PORT_STAT_CONNECTION) == connection) { | |
2544 | stable_time += HUB_DEBOUNCE_STEP; | |
2545 | if (stable_time >= HUB_DEBOUNCE_STABLE) | |
2546 | break; | |
2547 | } else { | |
2548 | stable_time = 0; | |
2549 | connection = portstatus & USB_PORT_STAT_CONNECTION; | |
2550 | } | |
2551 | ||
2552 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
2553 | clear_port_feature(hub->hdev, port1, | |
2554 | USB_PORT_FEAT_C_CONNECTION); | |
2555 | } | |
2556 | ||
2557 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
2558 | break; | |
2559 | msleep(HUB_DEBOUNCE_STEP); | |
2560 | } | |
2561 | ||
2562 | dev_dbg (hub->intfdev, | |
2563 | "debounce: port %d: total %dms stable %dms status 0x%x\n", | |
2564 | port1, total_time, stable_time, portstatus); | |
2565 | ||
2566 | if (stable_time < HUB_DEBOUNCE_STABLE) | |
2567 | return -ETIMEDOUT; | |
2568 | return portstatus; | |
2569 | } | |
2570 | ||
fc721f51 | 2571 | void usb_ep0_reinit(struct usb_device *udev) |
1da177e4 | 2572 | { |
ddeac4e7 AS |
2573 | usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); |
2574 | usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); | |
2caf7fcd | 2575 | usb_enable_endpoint(udev, &udev->ep0, true); |
1da177e4 | 2576 | } |
fc721f51 | 2577 | EXPORT_SYMBOL_GPL(usb_ep0_reinit); |
1da177e4 LT |
2578 | |
2579 | #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) | |
2580 | #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) | |
2581 | ||
4326ed0b | 2582 | static int hub_set_address(struct usb_device *udev, int devnum) |
1da177e4 LT |
2583 | { |
2584 | int retval; | |
c6515272 | 2585 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 2586 | |
c6515272 SS |
2587 | /* |
2588 | * The host controller will choose the device address, | |
2589 | * instead of the core having chosen it earlier | |
2590 | */ | |
2591 | if (!hcd->driver->address_device && devnum <= 1) | |
1da177e4 LT |
2592 | return -EINVAL; |
2593 | if (udev->state == USB_STATE_ADDRESS) | |
2594 | return 0; | |
2595 | if (udev->state != USB_STATE_DEFAULT) | |
2596 | return -EINVAL; | |
c8d4af8e | 2597 | if (hcd->driver->address_device) |
c6515272 | 2598 | retval = hcd->driver->address_device(hcd, udev); |
c8d4af8e | 2599 | else |
c6515272 SS |
2600 | retval = usb_control_msg(udev, usb_sndaddr0pipe(), |
2601 | USB_REQ_SET_ADDRESS, 0, devnum, 0, | |
2602 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
1da177e4 | 2603 | if (retval == 0) { |
c8d4af8e | 2604 | update_address(udev, devnum); |
4953d141 | 2605 | /* Device now using proper address. */ |
1da177e4 | 2606 | usb_set_device_state(udev, USB_STATE_ADDRESS); |
fc721f51 | 2607 | usb_ep0_reinit(udev); |
1da177e4 LT |
2608 | } |
2609 | return retval; | |
2610 | } | |
2611 | ||
2612 | /* Reset device, (re)assign address, get device descriptor. | |
2613 | * Device connection must be stable, no more debouncing needed. | |
2614 | * Returns device in USB_STATE_ADDRESS, except on error. | |
2615 | * | |
2616 | * If this is called for an already-existing device (as part of | |
742120c6 | 2617 | * usb_reset_and_verify_device), the caller must own the device lock. For a |
1da177e4 LT |
2618 | * newly detected device that is not accessible through any global |
2619 | * pointers, it's not necessary to lock the device. | |
2620 | */ | |
2621 | static int | |
2622 | hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, | |
2623 | int retry_counter) | |
2624 | { | |
4186ecf8 | 2625 | static DEFINE_MUTEX(usb_address0_mutex); |
1da177e4 LT |
2626 | |
2627 | struct usb_device *hdev = hub->hdev; | |
e7b77172 | 2628 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
1da177e4 LT |
2629 | int i, j, retval; |
2630 | unsigned delay = HUB_SHORT_RESET_TIME; | |
2631 | enum usb_device_speed oldspeed = udev->speed; | |
83a07196 | 2632 | char *speed, *type; |
4326ed0b | 2633 | int devnum = udev->devnum; |
1da177e4 LT |
2634 | |
2635 | /* root hub ports have a slightly longer reset period | |
2636 | * (from USB 2.0 spec, section 7.1.7.5) | |
2637 | */ | |
2638 | if (!hdev->parent) { | |
2639 | delay = HUB_ROOT_RESET_TIME; | |
2640 | if (port1 == hdev->bus->otg_port) | |
2641 | hdev->bus->b_hnp_enable = 0; | |
2642 | } | |
2643 | ||
2644 | /* Some low speed devices have problems with the quick delay, so */ | |
2645 | /* be a bit pessimistic with those devices. RHbug #23670 */ | |
2646 | if (oldspeed == USB_SPEED_LOW) | |
2647 | delay = HUB_LONG_RESET_TIME; | |
2648 | ||
4186ecf8 | 2649 | mutex_lock(&usb_address0_mutex); |
1da177e4 | 2650 | |
a5f0efab | 2651 | if (!udev->config && oldspeed == USB_SPEED_SUPER) { |
e7b77172 SS |
2652 | /* Don't reset USB 3.0 devices during an initial setup */ |
2653 | usb_set_device_state(udev, USB_STATE_DEFAULT); | |
2654 | } else { | |
2655 | /* Reset the device; full speed may morph to high speed */ | |
2656 | /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ | |
2657 | retval = hub_port_reset(hub, port1, udev, delay); | |
2658 | if (retval < 0) /* error or disconnect */ | |
2659 | goto fail; | |
2660 | /* success, speed is known */ | |
2661 | } | |
1da177e4 LT |
2662 | retval = -ENODEV; |
2663 | ||
2664 | if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { | |
2665 | dev_dbg(&udev->dev, "device reset changed speed!\n"); | |
2666 | goto fail; | |
2667 | } | |
2668 | oldspeed = udev->speed; | |
4326ed0b | 2669 | |
1da177e4 LT |
2670 | /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... |
2671 | * it's fixed size except for full speed devices. | |
5bb6e0ae IPG |
2672 | * For Wireless USB devices, ep0 max packet is always 512 (tho |
2673 | * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. | |
1da177e4 LT |
2674 | */ |
2675 | switch (udev->speed) { | |
6b403b02 | 2676 | case USB_SPEED_SUPER: |
551cdbbe | 2677 | case USB_SPEED_WIRELESS: /* fixed at 512 */ |
551509d2 | 2678 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); |
5bb6e0ae | 2679 | break; |
1da177e4 | 2680 | case USB_SPEED_HIGH: /* fixed at 64 */ |
551509d2 | 2681 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
2682 | break; |
2683 | case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ | |
2684 | /* to determine the ep0 maxpacket size, try to read | |
2685 | * the device descriptor to get bMaxPacketSize0 and | |
2686 | * then correct our initial guess. | |
2687 | */ | |
551509d2 | 2688 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
2689 | break; |
2690 | case USB_SPEED_LOW: /* fixed at 8 */ | |
551509d2 | 2691 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); |
1da177e4 LT |
2692 | break; |
2693 | default: | |
2694 | goto fail; | |
2695 | } | |
2696 | ||
83a07196 IPG |
2697 | type = ""; |
2698 | switch (udev->speed) { | |
2699 | case USB_SPEED_LOW: speed = "low"; break; | |
2700 | case USB_SPEED_FULL: speed = "full"; break; | |
2701 | case USB_SPEED_HIGH: speed = "high"; break; | |
6b403b02 SS |
2702 | case USB_SPEED_SUPER: |
2703 | speed = "super"; | |
2704 | break; | |
551cdbbe | 2705 | case USB_SPEED_WIRELESS: |
83a07196 IPG |
2706 | speed = "variable"; |
2707 | type = "Wireless "; | |
2708 | break; | |
2709 | default: speed = "?"; break; | |
2710 | } | |
c6515272 SS |
2711 | if (udev->speed != USB_SPEED_SUPER) |
2712 | dev_info(&udev->dev, | |
2713 | "%s %s speed %sUSB device using %s and address %d\n", | |
2714 | (udev->config) ? "reset" : "new", speed, type, | |
2715 | udev->bus->controller->driver->name, devnum); | |
1da177e4 LT |
2716 | |
2717 | /* Set up TT records, if needed */ | |
2718 | if (hdev->tt) { | |
2719 | udev->tt = hdev->tt; | |
2720 | udev->ttport = hdev->ttport; | |
2721 | } else if (udev->speed != USB_SPEED_HIGH | |
2722 | && hdev->speed == USB_SPEED_HIGH) { | |
2723 | udev->tt = &hub->tt; | |
2724 | udev->ttport = port1; | |
2725 | } | |
2726 | ||
2727 | /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? | |
2728 | * Because device hardware and firmware is sometimes buggy in | |
2729 | * this area, and this is how Linux has done it for ages. | |
2730 | * Change it cautiously. | |
2731 | * | |
2732 | * NOTE: If USE_NEW_SCHEME() is true we will start by issuing | |
2733 | * a 64-byte GET_DESCRIPTOR request. This is what Windows does, | |
2734 | * so it may help with some non-standards-compliant devices. | |
2735 | * Otherwise we start with SET_ADDRESS and then try to read the | |
2736 | * first 8 bytes of the device descriptor to get the ep0 maxpacket | |
2737 | * value. | |
2738 | */ | |
2739 | for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { | |
c6515272 SS |
2740 | /* |
2741 | * An xHCI controller cannot send any packets to a device until | |
2742 | * a set address command successfully completes. | |
2743 | */ | |
2744 | if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) { | |
1da177e4 LT |
2745 | struct usb_device_descriptor *buf; |
2746 | int r = 0; | |
2747 | ||
2748 | #define GET_DESCRIPTOR_BUFSIZE 64 | |
2749 | buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); | |
2750 | if (!buf) { | |
2751 | retval = -ENOMEM; | |
2752 | continue; | |
2753 | } | |
2754 | ||
b89ee19a AS |
2755 | /* Retry on all errors; some devices are flakey. |
2756 | * 255 is for WUSB devices, we actually need to use | |
2757 | * 512 (WUSB1.0[4.8.1]). | |
1da177e4 LT |
2758 | */ |
2759 | for (j = 0; j < 3; ++j) { | |
2760 | buf->bMaxPacketSize0 = 0; | |
2761 | r = usb_control_msg(udev, usb_rcvaddr0pipe(), | |
2762 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, | |
2763 | USB_DT_DEVICE << 8, 0, | |
2764 | buf, GET_DESCRIPTOR_BUFSIZE, | |
fd7c519d | 2765 | initial_descriptor_timeout); |
1da177e4 | 2766 | switch (buf->bMaxPacketSize0) { |
5bb6e0ae | 2767 | case 8: case 16: case 32: case 64: case 255: |
1da177e4 LT |
2768 | if (buf->bDescriptorType == |
2769 | USB_DT_DEVICE) { | |
2770 | r = 0; | |
2771 | break; | |
2772 | } | |
2773 | /* FALL THROUGH */ | |
2774 | default: | |
2775 | if (r == 0) | |
2776 | r = -EPROTO; | |
2777 | break; | |
2778 | } | |
2779 | if (r == 0) | |
2780 | break; | |
2781 | } | |
2782 | udev->descriptor.bMaxPacketSize0 = | |
2783 | buf->bMaxPacketSize0; | |
2784 | kfree(buf); | |
2785 | ||
2786 | retval = hub_port_reset(hub, port1, udev, delay); | |
2787 | if (retval < 0) /* error or disconnect */ | |
2788 | goto fail; | |
2789 | if (oldspeed != udev->speed) { | |
2790 | dev_dbg(&udev->dev, | |
2791 | "device reset changed speed!\n"); | |
2792 | retval = -ENODEV; | |
2793 | goto fail; | |
2794 | } | |
2795 | if (r) { | |
b9cef6c3 WF |
2796 | dev_err(&udev->dev, |
2797 | "device descriptor read/64, error %d\n", | |
2798 | r); | |
1da177e4 LT |
2799 | retval = -EMSGSIZE; |
2800 | continue; | |
2801 | } | |
2802 | #undef GET_DESCRIPTOR_BUFSIZE | |
2803 | } | |
2804 | ||
6c529cdc IPG |
2805 | /* |
2806 | * If device is WUSB, we already assigned an | |
2807 | * unauthorized address in the Connect Ack sequence; | |
2808 | * authorization will assign the final address. | |
2809 | */ | |
c6515272 | 2810 | if (udev->wusb == 0) { |
6c529cdc IPG |
2811 | for (j = 0; j < SET_ADDRESS_TRIES; ++j) { |
2812 | retval = hub_set_address(udev, devnum); | |
2813 | if (retval >= 0) | |
2814 | break; | |
2815 | msleep(200); | |
2816 | } | |
2817 | if (retval < 0) { | |
2818 | dev_err(&udev->dev, | |
2819 | "device not accepting address %d, error %d\n", | |
2820 | devnum, retval); | |
2821 | goto fail; | |
2822 | } | |
c6515272 SS |
2823 | if (udev->speed == USB_SPEED_SUPER) { |
2824 | devnum = udev->devnum; | |
2825 | dev_info(&udev->dev, | |
2826 | "%s SuperSpeed USB device using %s and address %d\n", | |
2827 | (udev->config) ? "reset" : "new", | |
2828 | udev->bus->controller->driver->name, devnum); | |
2829 | } | |
6c529cdc IPG |
2830 | |
2831 | /* cope with hardware quirkiness: | |
2832 | * - let SET_ADDRESS settle, some device hardware wants it | |
2833 | * - read ep0 maxpacket even for high and low speed, | |
2834 | */ | |
2835 | msleep(10); | |
c6515272 | 2836 | if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) |
1da177e4 | 2837 | break; |
6c529cdc | 2838 | } |
1da177e4 LT |
2839 | |
2840 | retval = usb_get_device_descriptor(udev, 8); | |
2841 | if (retval < 8) { | |
b9cef6c3 WF |
2842 | dev_err(&udev->dev, |
2843 | "device descriptor read/8, error %d\n", | |
2844 | retval); | |
1da177e4 LT |
2845 | if (retval >= 0) |
2846 | retval = -EMSGSIZE; | |
2847 | } else { | |
2848 | retval = 0; | |
2849 | break; | |
2850 | } | |
2851 | } | |
2852 | if (retval) | |
2853 | goto fail; | |
2854 | ||
6b403b02 SS |
2855 | if (udev->descriptor.bMaxPacketSize0 == 0xff || |
2856 | udev->speed == USB_SPEED_SUPER) | |
2857 | i = 512; | |
2858 | else | |
2859 | i = udev->descriptor.bMaxPacketSize0; | |
1da177e4 LT |
2860 | if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { |
2861 | if (udev->speed != USB_SPEED_FULL || | |
2862 | !(i == 8 || i == 16 || i == 32 || i == 64)) { | |
2863 | dev_err(&udev->dev, "ep0 maxpacket = %d\n", i); | |
2864 | retval = -EMSGSIZE; | |
2865 | goto fail; | |
2866 | } | |
2867 | dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); | |
2868 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); | |
fc721f51 | 2869 | usb_ep0_reinit(udev); |
1da177e4 LT |
2870 | } |
2871 | ||
2872 | retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); | |
2873 | if (retval < (signed)sizeof(udev->descriptor)) { | |
b9cef6c3 WF |
2874 | dev_err(&udev->dev, "device descriptor read/all, error %d\n", |
2875 | retval); | |
1da177e4 LT |
2876 | if (retval >= 0) |
2877 | retval = -ENOMSG; | |
2878 | goto fail; | |
2879 | } | |
2880 | ||
2881 | retval = 0; | |
48f24970 AD |
2882 | /* notify HCD that we have a device connected and addressed */ |
2883 | if (hcd->driver->update_device) | |
2884 | hcd->driver->update_device(hcd, udev); | |
1da177e4 | 2885 | fail: |
4326ed0b | 2886 | if (retval) { |
1da177e4 | 2887 | hub_port_disable(hub, port1, 0); |
4953d141 | 2888 | update_address(udev, devnum); /* for disconnect processing */ |
4326ed0b | 2889 | } |
4186ecf8 | 2890 | mutex_unlock(&usb_address0_mutex); |
1da177e4 LT |
2891 | return retval; |
2892 | } | |
2893 | ||
2894 | static void | |
2895 | check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) | |
2896 | { | |
2897 | struct usb_qualifier_descriptor *qual; | |
2898 | int status; | |
2899 | ||
e94b1766 | 2900 | qual = kmalloc (sizeof *qual, GFP_KERNEL); |
1da177e4 LT |
2901 | if (qual == NULL) |
2902 | return; | |
2903 | ||
2904 | status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, | |
2905 | qual, sizeof *qual); | |
2906 | if (status == sizeof *qual) { | |
2907 | dev_info(&udev->dev, "not running at top speed; " | |
2908 | "connect to a high speed hub\n"); | |
2909 | /* hub LEDs are probably harder to miss than syslog */ | |
2910 | if (hub->has_indicators) { | |
2911 | hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; | |
c4028958 | 2912 | schedule_delayed_work (&hub->leds, 0); |
1da177e4 LT |
2913 | } |
2914 | } | |
1bc3c9e1 | 2915 | kfree(qual); |
1da177e4 LT |
2916 | } |
2917 | ||
2918 | static unsigned | |
2919 | hub_power_remaining (struct usb_hub *hub) | |
2920 | { | |
2921 | struct usb_device *hdev = hub->hdev; | |
2922 | int remaining; | |
55c52718 | 2923 | int port1; |
1da177e4 | 2924 | |
55c52718 | 2925 | if (!hub->limited_power) |
1da177e4 LT |
2926 | return 0; |
2927 | ||
55c52718 AS |
2928 | remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; |
2929 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
2930 | struct usb_device *udev = hdev->children[port1 - 1]; | |
2931 | int delta; | |
1da177e4 LT |
2932 | |
2933 | if (!udev) | |
2934 | continue; | |
2935 | ||
55c52718 AS |
2936 | /* Unconfigured devices may not use more than 100mA, |
2937 | * or 8mA for OTG ports */ | |
1da177e4 | 2938 | if (udev->actconfig) |
55c52718 AS |
2939 | delta = udev->actconfig->desc.bMaxPower * 2; |
2940 | else if (port1 != udev->bus->otg_port || hdev->parent) | |
2941 | delta = 100; | |
1da177e4 | 2942 | else |
55c52718 AS |
2943 | delta = 8; |
2944 | if (delta > hub->mA_per_port) | |
b9cef6c3 WF |
2945 | dev_warn(&udev->dev, |
2946 | "%dmA is over %umA budget for port %d!\n", | |
2947 | delta, hub->mA_per_port, port1); | |
1da177e4 LT |
2948 | remaining -= delta; |
2949 | } | |
2950 | if (remaining < 0) { | |
55c52718 AS |
2951 | dev_warn(hub->intfdev, "%dmA over power budget!\n", |
2952 | - remaining); | |
1da177e4 LT |
2953 | remaining = 0; |
2954 | } | |
2955 | return remaining; | |
2956 | } | |
2957 | ||
2958 | /* Handle physical or logical connection change events. | |
2959 | * This routine is called when: | |
2960 | * a port connection-change occurs; | |
2961 | * a port enable-change occurs (often caused by EMI); | |
742120c6 | 2962 | * usb_reset_and_verify_device() encounters changed descriptors (as from |
1da177e4 LT |
2963 | * a firmware download) |
2964 | * caller already locked the hub | |
2965 | */ | |
2966 | static void hub_port_connect_change(struct usb_hub *hub, int port1, | |
2967 | u16 portstatus, u16 portchange) | |
2968 | { | |
2969 | struct usb_device *hdev = hub->hdev; | |
2970 | struct device *hub_dev = hub->intfdev; | |
90da096e | 2971 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
24618b0c AS |
2972 | unsigned wHubCharacteristics = |
2973 | le16_to_cpu(hub->descriptor->wHubCharacteristics); | |
8808f00c | 2974 | struct usb_device *udev; |
1da177e4 | 2975 | int status, i; |
24618b0c | 2976 | |
1da177e4 LT |
2977 | dev_dbg (hub_dev, |
2978 | "port %d, status %04x, change %04x, %s\n", | |
2979 | port1, portstatus, portchange, portspeed (portstatus)); | |
2980 | ||
2981 | if (hub->has_indicators) { | |
2982 | set_port_led(hub, port1, HUB_LED_AUTO); | |
2983 | hub->indicator[port1-1] = INDICATOR_AUTO; | |
2984 | } | |
1da177e4 LT |
2985 | |
2986 | #ifdef CONFIG_USB_OTG | |
2987 | /* during HNP, don't repeat the debounce */ | |
2988 | if (hdev->bus->is_b_host) | |
24618b0c AS |
2989 | portchange &= ~(USB_PORT_STAT_C_CONNECTION | |
2990 | USB_PORT_STAT_C_ENABLE); | |
1da177e4 LT |
2991 | #endif |
2992 | ||
8808f00c AS |
2993 | /* Try to resuscitate an existing device */ |
2994 | udev = hdev->children[port1-1]; | |
2995 | if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && | |
2996 | udev->state != USB_STATE_NOTATTACHED) { | |
8808f00c AS |
2997 | usb_lock_device(udev); |
2998 | if (portstatus & USB_PORT_STAT_ENABLE) { | |
2999 | status = 0; /* Nothing to do */ | |
8808f00c AS |
3000 | |
3001 | #ifdef CONFIG_USB_SUSPEND | |
5257d97a AS |
3002 | } else if (udev->state == USB_STATE_SUSPENDED && |
3003 | udev->persist_enabled) { | |
8808f00c AS |
3004 | /* For a suspended device, treat this as a |
3005 | * remote wakeup event. | |
3006 | */ | |
0534d468 | 3007 | status = usb_remote_wakeup(udev); |
8808f00c AS |
3008 | #endif |
3009 | ||
3010 | } else { | |
5257d97a | 3011 | status = -ENODEV; /* Don't resuscitate */ |
8808f00c AS |
3012 | } |
3013 | usb_unlock_device(udev); | |
3014 | ||
3015 | if (status == 0) { | |
3016 | clear_bit(port1, hub->change_bits); | |
3017 | return; | |
3018 | } | |
3019 | } | |
3020 | ||
24618b0c | 3021 | /* Disconnect any existing devices under this port */ |
8808f00c | 3022 | if (udev) |
24618b0c AS |
3023 | usb_disconnect(&hdev->children[port1-1]); |
3024 | clear_bit(port1, hub->change_bits); | |
3025 | ||
253e0572 AS |
3026 | /* We can forget about a "removed" device when there's a physical |
3027 | * disconnect or the connect status changes. | |
3028 | */ | |
3029 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
3030 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
3031 | clear_bit(port1, hub->removed_bits); | |
3032 | ||
5257d97a AS |
3033 | if (portchange & (USB_PORT_STAT_C_CONNECTION | |
3034 | USB_PORT_STAT_C_ENABLE)) { | |
3035 | status = hub_port_debounce(hub, port1); | |
3036 | if (status < 0) { | |
3037 | if (printk_ratelimit()) | |
3038 | dev_err(hub_dev, "connect-debounce failed, " | |
3039 | "port %d disabled\n", port1); | |
3040 | portstatus &= ~USB_PORT_STAT_CONNECTION; | |
3041 | } else { | |
3042 | portstatus = status; | |
3043 | } | |
3044 | } | |
3045 | ||
253e0572 AS |
3046 | /* Return now if debouncing failed or nothing is connected or |
3047 | * the device was "removed". | |
3048 | */ | |
3049 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
3050 | test_bit(port1, hub->removed_bits)) { | |
1da177e4 LT |
3051 | |
3052 | /* maybe switch power back on (e.g. root hub was reset) */ | |
74ad9bd2 | 3053 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 |
749da5f8 | 3054 | && !(portstatus & USB_PORT_STAT_POWER)) |
1da177e4 | 3055 | set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
5257d97a | 3056 | |
1da177e4 LT |
3057 | if (portstatus & USB_PORT_STAT_ENABLE) |
3058 | goto done; | |
3059 | return; | |
3060 | } | |
3061 | ||
1da177e4 | 3062 | for (i = 0; i < SET_CONFIG_TRIES; i++) { |
1da177e4 LT |
3063 | |
3064 | /* reallocate for each attempt, since references | |
3065 | * to the previous one can escape in various ways | |
3066 | */ | |
3067 | udev = usb_alloc_dev(hdev, hdev->bus, port1); | |
3068 | if (!udev) { | |
3069 | dev_err (hub_dev, | |
3070 | "couldn't allocate port %d usb_device\n", | |
3071 | port1); | |
3072 | goto done; | |
3073 | } | |
3074 | ||
3075 | usb_set_device_state(udev, USB_STATE_POWERED); | |
55c52718 | 3076 | udev->bus_mA = hub->mA_per_port; |
b6956ffa | 3077 | udev->level = hdev->level + 1; |
8af548dc | 3078 | udev->wusb = hub_is_wusb(hub); |
55c52718 | 3079 | |
e7b77172 SS |
3080 | /* |
3081 | * USB 3.0 devices are reset automatically before the connect | |
3082 | * port status change appears, and the root hub port status | |
3083 | * shows the correct speed. We also get port change | |
3084 | * notifications for USB 3.0 devices from the USB 3.0 portion of | |
3085 | * an external USB 3.0 hub, but this isn't handled correctly yet | |
3086 | * FIXME. | |
3087 | */ | |
3088 | ||
3089 | if (!(hcd->driver->flags & HCD_USB3)) | |
3090 | udev->speed = USB_SPEED_UNKNOWN; | |
3091 | else if ((hdev->parent == NULL) && | |
288ead45 | 3092 | (portstatus & USB_PORT_STAT_SUPER_SPEED)) |
e7b77172 SS |
3093 | udev->speed = USB_SPEED_SUPER; |
3094 | else | |
3095 | udev->speed = USB_SPEED_UNKNOWN; | |
3096 | ||
c6515272 | 3097 | /* |
c8d4af8e AX |
3098 | * Set the address. |
3099 | * Note xHCI needs to issue an address device command later | |
3100 | * in the hub_port_init sequence for SS/HS/FS/LS devices, | |
3101 | * and xHC will assign an address to the device. But use | |
3102 | * kernel assigned address here, to avoid any address conflict | |
3103 | * issue. | |
c6515272 | 3104 | */ |
c8d4af8e AX |
3105 | choose_address(udev); |
3106 | if (udev->devnum <= 0) { | |
3107 | status = -ENOTCONN; /* Don't retry */ | |
3108 | goto loop; | |
c6515272 SS |
3109 | } |
3110 | ||
e7b77172 | 3111 | /* reset (non-USB 3.0 devices) and get descriptor */ |
1da177e4 LT |
3112 | status = hub_port_init(hub, udev, port1, i); |
3113 | if (status < 0) | |
3114 | goto loop; | |
3115 | ||
93362a87 PD |
3116 | usb_detect_quirks(udev); |
3117 | if (udev->quirks & USB_QUIRK_DELAY_INIT) | |
3118 | msleep(1000); | |
3119 | ||
1da177e4 LT |
3120 | /* consecutive bus-powered hubs aren't reliable; they can |
3121 | * violate the voltage drop budget. if the new child has | |
3122 | * a "powered" LED, users should notice we didn't enable it | |
3123 | * (without reading syslog), even without per-port LEDs | |
3124 | * on the parent. | |
3125 | */ | |
3126 | if (udev->descriptor.bDeviceClass == USB_CLASS_HUB | |
55c52718 | 3127 | && udev->bus_mA <= 100) { |
1da177e4 LT |
3128 | u16 devstat; |
3129 | ||
3130 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, | |
3131 | &devstat); | |
55c52718 | 3132 | if (status < 2) { |
1da177e4 LT |
3133 | dev_dbg(&udev->dev, "get status %d ?\n", status); |
3134 | goto loop_disable; | |
3135 | } | |
55c52718 | 3136 | le16_to_cpus(&devstat); |
1da177e4 LT |
3137 | if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
3138 | dev_err(&udev->dev, | |
3139 | "can't connect bus-powered hub " | |
3140 | "to this port\n"); | |
3141 | if (hub->has_indicators) { | |
3142 | hub->indicator[port1-1] = | |
3143 | INDICATOR_AMBER_BLINK; | |
c4028958 | 3144 | schedule_delayed_work (&hub->leds, 0); |
1da177e4 LT |
3145 | } |
3146 | status = -ENOTCONN; /* Don't retry */ | |
3147 | goto loop_disable; | |
3148 | } | |
3149 | } | |
3150 | ||
3151 | /* check for devices running slower than they could */ | |
3152 | if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 | |
3153 | && udev->speed == USB_SPEED_FULL | |
3154 | && highspeed_hubs != 0) | |
3155 | check_highspeed (hub, udev, port1); | |
3156 | ||
3157 | /* Store the parent's children[] pointer. At this point | |
3158 | * udev becomes globally accessible, although presumably | |
3159 | * no one will look at it until hdev is unlocked. | |
3160 | */ | |
1da177e4 LT |
3161 | status = 0; |
3162 | ||
3163 | /* We mustn't add new devices if the parent hub has | |
3164 | * been disconnected; we would race with the | |
3165 | * recursively_mark_NOTATTACHED() routine. | |
3166 | */ | |
3167 | spin_lock_irq(&device_state_lock); | |
3168 | if (hdev->state == USB_STATE_NOTATTACHED) | |
3169 | status = -ENOTCONN; | |
3170 | else | |
3171 | hdev->children[port1-1] = udev; | |
3172 | spin_unlock_irq(&device_state_lock); | |
3173 | ||
3174 | /* Run it through the hoops (find a driver, etc) */ | |
3175 | if (!status) { | |
3176 | status = usb_new_device(udev); | |
3177 | if (status) { | |
3178 | spin_lock_irq(&device_state_lock); | |
3179 | hdev->children[port1-1] = NULL; | |
3180 | spin_unlock_irq(&device_state_lock); | |
3181 | } | |
3182 | } | |
3183 | ||
1da177e4 LT |
3184 | if (status) |
3185 | goto loop_disable; | |
3186 | ||
3187 | status = hub_power_remaining(hub); | |
3188 | if (status) | |
55c52718 | 3189 | dev_dbg(hub_dev, "%dmA power budget left\n", status); |
1da177e4 LT |
3190 | |
3191 | return; | |
3192 | ||
3193 | loop_disable: | |
3194 | hub_port_disable(hub, port1, 1); | |
3195 | loop: | |
fc721f51 | 3196 | usb_ep0_reinit(udev); |
1da177e4 | 3197 | release_address(udev); |
f7410ced | 3198 | hub_free_dev(udev); |
1da177e4 | 3199 | usb_put_dev(udev); |
ffcdc18d | 3200 | if ((status == -ENOTCONN) || (status == -ENOTSUPP)) |
1da177e4 LT |
3201 | break; |
3202 | } | |
3a31155c AS |
3203 | if (hub->hdev->parent || |
3204 | !hcd->driver->port_handed_over || | |
3205 | !(hcd->driver->port_handed_over)(hcd, port1)) | |
3206 | dev_err(hub_dev, "unable to enumerate USB device on port %d\n", | |
3207 | port1); | |
1da177e4 LT |
3208 | |
3209 | done: | |
3210 | hub_port_disable(hub, port1, 1); | |
90da096e BR |
3211 | if (hcd->driver->relinquish_port && !hub->hdev->parent) |
3212 | hcd->driver->relinquish_port(hcd, port1); | |
1da177e4 LT |
3213 | } |
3214 | ||
3215 | static void hub_events(void) | |
3216 | { | |
3217 | struct list_head *tmp; | |
3218 | struct usb_device *hdev; | |
3219 | struct usb_interface *intf; | |
3220 | struct usb_hub *hub; | |
3221 | struct device *hub_dev; | |
3222 | u16 hubstatus; | |
3223 | u16 hubchange; | |
3224 | u16 portstatus; | |
3225 | u16 portchange; | |
3226 | int i, ret; | |
3227 | int connect_change; | |
3228 | ||
3229 | /* | |
3230 | * We restart the list every time to avoid a deadlock with | |
3231 | * deleting hubs downstream from this one. This should be | |
3232 | * safe since we delete the hub from the event list. | |
3233 | * Not the most efficient, but avoids deadlocks. | |
3234 | */ | |
3235 | while (1) { | |
3236 | ||
3237 | /* Grab the first entry at the beginning of the list */ | |
3238 | spin_lock_irq(&hub_event_lock); | |
3239 | if (list_empty(&hub_event_list)) { | |
3240 | spin_unlock_irq(&hub_event_lock); | |
3241 | break; | |
3242 | } | |
3243 | ||
3244 | tmp = hub_event_list.next; | |
3245 | list_del_init(tmp); | |
3246 | ||
3247 | hub = list_entry(tmp, struct usb_hub, event_list); | |
e8054854 AS |
3248 | kref_get(&hub->kref); |
3249 | spin_unlock_irq(&hub_event_lock); | |
1da177e4 | 3250 | |
e8054854 AS |
3251 | hdev = hub->hdev; |
3252 | hub_dev = hub->intfdev; | |
3253 | intf = to_usb_interface(hub_dev); | |
40f122f3 | 3254 | dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", |
1da177e4 LT |
3255 | hdev->state, hub->descriptor |
3256 | ? hub->descriptor->bNbrPorts | |
3257 | : 0, | |
3258 | /* NOTE: expects max 15 ports... */ | |
3259 | (u16) hub->change_bits[0], | |
40f122f3 | 3260 | (u16) hub->event_bits[0]); |
1da177e4 | 3261 | |
1da177e4 LT |
3262 | /* Lock the device, then check to see if we were |
3263 | * disconnected while waiting for the lock to succeed. */ | |
06b84e8a | 3264 | usb_lock_device(hdev); |
e8054854 | 3265 | if (unlikely(hub->disconnected)) |
9bbdf1e0 | 3266 | goto loop_disconnected; |
1da177e4 LT |
3267 | |
3268 | /* If the hub has died, clean up after it */ | |
3269 | if (hdev->state == USB_STATE_NOTATTACHED) { | |
7de18d8b | 3270 | hub->error = -ENODEV; |
4330354f | 3271 | hub_quiesce(hub, HUB_DISCONNECT); |
1da177e4 LT |
3272 | goto loop; |
3273 | } | |
3274 | ||
40f122f3 AS |
3275 | /* Autoresume */ |
3276 | ret = usb_autopm_get_interface(intf); | |
3277 | if (ret) { | |
3278 | dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); | |
3279 | goto loop; | |
3280 | } | |
a8e7c565 | 3281 | |
40f122f3 | 3282 | /* If this is an inactive hub, do nothing */ |
1da177e4 | 3283 | if (hub->quiescing) |
40f122f3 | 3284 | goto loop_autopm; |
1da177e4 LT |
3285 | |
3286 | if (hub->error) { | |
3287 | dev_dbg (hub_dev, "resetting for error %d\n", | |
3288 | hub->error); | |
3289 | ||
742120c6 | 3290 | ret = usb_reset_device(hdev); |
1da177e4 LT |
3291 | if (ret) { |
3292 | dev_dbg (hub_dev, | |
3293 | "error resetting hub: %d\n", ret); | |
40f122f3 | 3294 | goto loop_autopm; |
1da177e4 LT |
3295 | } |
3296 | ||
3297 | hub->nerrors = 0; | |
3298 | hub->error = 0; | |
3299 | } | |
3300 | ||
3301 | /* deal with port status changes */ | |
3302 | for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { | |
3303 | if (test_bit(i, hub->busy_bits)) | |
3304 | continue; | |
3305 | connect_change = test_bit(i, hub->change_bits); | |
3306 | if (!test_and_clear_bit(i, hub->event_bits) && | |
6ee0b270 | 3307 | !connect_change) |
1da177e4 LT |
3308 | continue; |
3309 | ||
3310 | ret = hub_port_status(hub, i, | |
3311 | &portstatus, &portchange); | |
3312 | if (ret < 0) | |
3313 | continue; | |
3314 | ||
1da177e4 LT |
3315 | if (portchange & USB_PORT_STAT_C_CONNECTION) { |
3316 | clear_port_feature(hdev, i, | |
3317 | USB_PORT_FEAT_C_CONNECTION); | |
3318 | connect_change = 1; | |
3319 | } | |
3320 | ||
3321 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
3322 | if (!connect_change) | |
3323 | dev_dbg (hub_dev, | |
3324 | "port %d enable change, " | |
3325 | "status %08x\n", | |
3326 | i, portstatus); | |
3327 | clear_port_feature(hdev, i, | |
3328 | USB_PORT_FEAT_C_ENABLE); | |
3329 | ||
3330 | /* | |
3331 | * EM interference sometimes causes badly | |
3332 | * shielded USB devices to be shutdown by | |
3333 | * the hub, this hack enables them again. | |
3334 | * Works at least with mouse driver. | |
3335 | */ | |
3336 | if (!(portstatus & USB_PORT_STAT_ENABLE) | |
3337 | && !connect_change | |
3338 | && hdev->children[i-1]) { | |
3339 | dev_err (hub_dev, | |
3340 | "port %i " | |
3341 | "disabled by hub (EMI?), " | |
3342 | "re-enabling...\n", | |
3343 | i); | |
3344 | connect_change = 1; | |
3345 | } | |
3346 | } | |
3347 | ||
3348 | if (portchange & USB_PORT_STAT_C_SUSPEND) { | |
8808f00c AS |
3349 | struct usb_device *udev; |
3350 | ||
1da177e4 LT |
3351 | clear_port_feature(hdev, i, |
3352 | USB_PORT_FEAT_C_SUSPEND); | |
8808f00c AS |
3353 | udev = hdev->children[i-1]; |
3354 | if (udev) { | |
49d0f078 AS |
3355 | /* TRSMRCY = 10 msec */ |
3356 | msleep(10); | |
3357 | ||
8808f00c | 3358 | usb_lock_device(udev); |
0534d468 | 3359 | ret = usb_remote_wakeup(hdev-> |
1da177e4 | 3360 | children[i-1]); |
8808f00c | 3361 | usb_unlock_device(udev); |
1da177e4 LT |
3362 | if (ret < 0) |
3363 | connect_change = 1; | |
3364 | } else { | |
3365 | ret = -ENODEV; | |
3366 | hub_port_disable(hub, i, 1); | |
3367 | } | |
3368 | dev_dbg (hub_dev, | |
3369 | "resume on port %d, status %d\n", | |
3370 | i, ret); | |
3371 | } | |
3372 | ||
3373 | if (portchange & USB_PORT_STAT_C_OVERCURRENT) { | |
3374 | dev_err (hub_dev, | |
3375 | "over-current change on port %d\n", | |
3376 | i); | |
3377 | clear_port_feature(hdev, i, | |
3378 | USB_PORT_FEAT_C_OVER_CURRENT); | |
8520f380 | 3379 | hub_power_on(hub, true); |
1da177e4 LT |
3380 | } |
3381 | ||
3382 | if (portchange & USB_PORT_STAT_C_RESET) { | |
3383 | dev_dbg (hub_dev, | |
3384 | "reset change on port %d\n", | |
3385 | i); | |
3386 | clear_port_feature(hdev, i, | |
3387 | USB_PORT_FEAT_C_RESET); | |
3388 | } | |
3389 | ||
3390 | if (connect_change) | |
3391 | hub_port_connect_change(hub, i, | |
3392 | portstatus, portchange); | |
3393 | } /* end for i */ | |
3394 | ||
3395 | /* deal with hub status changes */ | |
3396 | if (test_and_clear_bit(0, hub->event_bits) == 0) | |
3397 | ; /* do nothing */ | |
3398 | else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) | |
3399 | dev_err (hub_dev, "get_hub_status failed\n"); | |
3400 | else { | |
3401 | if (hubchange & HUB_CHANGE_LOCAL_POWER) { | |
3402 | dev_dbg (hub_dev, "power change\n"); | |
3403 | clear_hub_feature(hdev, C_HUB_LOCAL_POWER); | |
55c52718 AS |
3404 | if (hubstatus & HUB_STATUS_LOCAL_POWER) |
3405 | /* FIXME: Is this always true? */ | |
55c52718 | 3406 | hub->limited_power = 1; |
403fae78 | 3407 | else |
3408 | hub->limited_power = 0; | |
1da177e4 LT |
3409 | } |
3410 | if (hubchange & HUB_CHANGE_OVERCURRENT) { | |
3411 | dev_dbg (hub_dev, "overcurrent change\n"); | |
3412 | msleep(500); /* Cool down */ | |
3413 | clear_hub_feature(hdev, C_HUB_OVER_CURRENT); | |
8520f380 | 3414 | hub_power_on(hub, true); |
1da177e4 LT |
3415 | } |
3416 | } | |
3417 | ||
8e4ceb38 AS |
3418 | loop_autopm: |
3419 | /* Balance the usb_autopm_get_interface() above */ | |
3420 | usb_autopm_put_interface_no_suspend(intf); | |
3421 | loop: | |
3422 | /* Balance the usb_autopm_get_interface_no_resume() in | |
3423 | * kick_khubd() and allow autosuspend. | |
3424 | */ | |
3425 | usb_autopm_put_interface(intf); | |
9bbdf1e0 | 3426 | loop_disconnected: |
1da177e4 | 3427 | usb_unlock_device(hdev); |
e8054854 | 3428 | kref_put(&hub->kref, hub_release); |
1da177e4 LT |
3429 | |
3430 | } /* end while (1) */ | |
3431 | } | |
3432 | ||
3433 | static int hub_thread(void *__unused) | |
3434 | { | |
3bb1af52 AS |
3435 | /* khubd needs to be freezable to avoid intefering with USB-PERSIST |
3436 | * port handover. Otherwise it might see that a full-speed device | |
3437 | * was gone before the EHCI controller had handed its port over to | |
3438 | * the companion full-speed controller. | |
3439 | */ | |
83144186 | 3440 | set_freezable(); |
3bb1af52 | 3441 | |
1da177e4 LT |
3442 | do { |
3443 | hub_events(); | |
e42837bc | 3444 | wait_event_freezable(khubd_wait, |
9c8d6178 | 3445 | !list_empty(&hub_event_list) || |
3446 | kthread_should_stop()); | |
9c8d6178 | 3447 | } while (!kthread_should_stop() || !list_empty(&hub_event_list)); |
1da177e4 | 3448 | |
9c8d6178 | 3449 | pr_debug("%s: khubd exiting\n", usbcore_name); |
3450 | return 0; | |
1da177e4 LT |
3451 | } |
3452 | ||
1e927d96 | 3453 | static const struct usb_device_id hub_id_table[] = { |
1da177e4 LT |
3454 | { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, |
3455 | .bDeviceClass = USB_CLASS_HUB}, | |
3456 | { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, | |
3457 | .bInterfaceClass = USB_CLASS_HUB}, | |
3458 | { } /* Terminating entry */ | |
3459 | }; | |
3460 | ||
3461 | MODULE_DEVICE_TABLE (usb, hub_id_table); | |
3462 | ||
3463 | static struct usb_driver hub_driver = { | |
1da177e4 LT |
3464 | .name = "hub", |
3465 | .probe = hub_probe, | |
3466 | .disconnect = hub_disconnect, | |
3467 | .suspend = hub_suspend, | |
3468 | .resume = hub_resume, | |
f07600cf | 3469 | .reset_resume = hub_reset_resume, |
7de18d8b AS |
3470 | .pre_reset = hub_pre_reset, |
3471 | .post_reset = hub_post_reset, | |
c532b29a | 3472 | .unlocked_ioctl = hub_ioctl, |
1da177e4 | 3473 | .id_table = hub_id_table, |
40f122f3 | 3474 | .supports_autosuspend = 1, |
1da177e4 LT |
3475 | }; |
3476 | ||
3477 | int usb_hub_init(void) | |
3478 | { | |
1da177e4 LT |
3479 | if (usb_register(&hub_driver) < 0) { |
3480 | printk(KERN_ERR "%s: can't register hub driver\n", | |
3481 | usbcore_name); | |
3482 | return -1; | |
3483 | } | |
3484 | ||
9c8d6178 | 3485 | khubd_task = kthread_run(hub_thread, NULL, "khubd"); |
3486 | if (!IS_ERR(khubd_task)) | |
1da177e4 | 3487 | return 0; |
1da177e4 LT |
3488 | |
3489 | /* Fall through if kernel_thread failed */ | |
3490 | usb_deregister(&hub_driver); | |
3491 | printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); | |
3492 | ||
3493 | return -1; | |
3494 | } | |
3495 | ||
3496 | void usb_hub_cleanup(void) | |
3497 | { | |
9c8d6178 | 3498 | kthread_stop(khubd_task); |
1da177e4 LT |
3499 | |
3500 | /* | |
3501 | * Hub resources are freed for us by usb_deregister. It calls | |
3502 | * usb_driver_purge on every device which in turn calls that | |
3503 | * devices disconnect function if it is using this driver. | |
3504 | * The hub_disconnect function takes care of releasing the | |
3505 | * individual hub resources. -greg | |
3506 | */ | |
3507 | usb_deregister(&hub_driver); | |
3508 | } /* usb_hub_cleanup() */ | |
3509 | ||
eb764c4b AS |
3510 | static int descriptors_changed(struct usb_device *udev, |
3511 | struct usb_device_descriptor *old_device_descriptor) | |
3512 | { | |
3513 | int changed = 0; | |
3514 | unsigned index; | |
3515 | unsigned serial_len = 0; | |
3516 | unsigned len; | |
3517 | unsigned old_length; | |
3518 | int length; | |
3519 | char *buf; | |
3520 | ||
3521 | if (memcmp(&udev->descriptor, old_device_descriptor, | |
3522 | sizeof(*old_device_descriptor)) != 0) | |
3523 | return 1; | |
3524 | ||
3525 | /* Since the idVendor, idProduct, and bcdDevice values in the | |
3526 | * device descriptor haven't changed, we will assume the | |
3527 | * Manufacturer and Product strings haven't changed either. | |
3528 | * But the SerialNumber string could be different (e.g., a | |
3529 | * different flash card of the same brand). | |
3530 | */ | |
3531 | if (udev->serial) | |
3532 | serial_len = strlen(udev->serial) + 1; | |
1da177e4 | 3533 | |
eb764c4b | 3534 | len = serial_len; |
1da177e4 | 3535 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
eb764c4b AS |
3536 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
3537 | len = max(len, old_length); | |
1da177e4 | 3538 | } |
eb764c4b | 3539 | |
0cc1a51f | 3540 | buf = kmalloc(len, GFP_NOIO); |
1da177e4 LT |
3541 | if (buf == NULL) { |
3542 | dev_err(&udev->dev, "no mem to re-read configs after reset\n"); | |
3543 | /* assume the worst */ | |
3544 | return 1; | |
3545 | } | |
3546 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { | |
eb764c4b | 3547 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
1da177e4 LT |
3548 | length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, |
3549 | old_length); | |
eb764c4b | 3550 | if (length != old_length) { |
1da177e4 LT |
3551 | dev_dbg(&udev->dev, "config index %d, error %d\n", |
3552 | index, length); | |
eb764c4b | 3553 | changed = 1; |
1da177e4 LT |
3554 | break; |
3555 | } | |
3556 | if (memcmp (buf, udev->rawdescriptors[index], old_length) | |
3557 | != 0) { | |
3558 | dev_dbg(&udev->dev, "config index %d changed (#%d)\n", | |
eb764c4b AS |
3559 | index, |
3560 | ((struct usb_config_descriptor *) buf)-> | |
3561 | bConfigurationValue); | |
3562 | changed = 1; | |
1da177e4 LT |
3563 | break; |
3564 | } | |
3565 | } | |
eb764c4b AS |
3566 | |
3567 | if (!changed && serial_len) { | |
3568 | length = usb_string(udev, udev->descriptor.iSerialNumber, | |
3569 | buf, serial_len); | |
3570 | if (length + 1 != serial_len) { | |
3571 | dev_dbg(&udev->dev, "serial string error %d\n", | |
3572 | length); | |
3573 | changed = 1; | |
3574 | } else if (memcmp(buf, udev->serial, length) != 0) { | |
3575 | dev_dbg(&udev->dev, "serial string changed\n"); | |
3576 | changed = 1; | |
3577 | } | |
3578 | } | |
3579 | ||
1da177e4 | 3580 | kfree(buf); |
eb764c4b | 3581 | return changed; |
1da177e4 LT |
3582 | } |
3583 | ||
3584 | /** | |
742120c6 | 3585 | * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device |
1da177e4 LT |
3586 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
3587 | * | |
79efa097 AS |
3588 | * WARNING - don't use this routine to reset a composite device |
3589 | * (one with multiple interfaces owned by separate drivers)! | |
742120c6 | 3590 | * Use usb_reset_device() instead. |
1da177e4 LT |
3591 | * |
3592 | * Do a port reset, reassign the device's address, and establish its | |
3593 | * former operating configuration. If the reset fails, or the device's | |
3594 | * descriptors change from their values before the reset, or the original | |
3595 | * configuration and altsettings cannot be restored, a flag will be set | |
3596 | * telling khubd to pretend the device has been disconnected and then | |
3597 | * re-connected. All drivers will be unbound, and the device will be | |
3598 | * re-enumerated and probed all over again. | |
3599 | * | |
3600 | * Returns 0 if the reset succeeded, -ENODEV if the device has been | |
3601 | * flagged for logical disconnection, or some other negative error code | |
3602 | * if the reset wasn't even attempted. | |
3603 | * | |
3604 | * The caller must own the device lock. For example, it's safe to use | |
3605 | * this from a driver probe() routine after downloading new firmware. | |
3606 | * For calls that might not occur during probe(), drivers should lock | |
3607 | * the device using usb_lock_device_for_reset(). | |
6bc6cff5 AS |
3608 | * |
3609 | * Locking exception: This routine may also be called from within an | |
3610 | * autoresume handler. Such usage won't conflict with other tasks | |
3611 | * holding the device lock because these tasks should always call | |
3612 | * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. | |
1da177e4 | 3613 | */ |
742120c6 | 3614 | static int usb_reset_and_verify_device(struct usb_device *udev) |
1da177e4 LT |
3615 | { |
3616 | struct usb_device *parent_hdev = udev->parent; | |
3617 | struct usb_hub *parent_hub; | |
3f0479e0 | 3618 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 3619 | struct usb_device_descriptor descriptor = udev->descriptor; |
12c3da34 AS |
3620 | int i, ret = 0; |
3621 | int port1 = udev->portnum; | |
1da177e4 LT |
3622 | |
3623 | if (udev->state == USB_STATE_NOTATTACHED || | |
3624 | udev->state == USB_STATE_SUSPENDED) { | |
3625 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
3626 | udev->state); | |
3627 | return -EINVAL; | |
3628 | } | |
3629 | ||
3630 | if (!parent_hdev) { | |
4bec9917 | 3631 | /* this requires hcd-specific logic; see ohci_restart() */ |
441b62c1 | 3632 | dev_dbg(&udev->dev, "%s for root hub!\n", __func__); |
1da177e4 LT |
3633 | return -EISDIR; |
3634 | } | |
1da177e4 LT |
3635 | parent_hub = hdev_to_hub(parent_hdev); |
3636 | ||
1da177e4 LT |
3637 | set_bit(port1, parent_hub->busy_bits); |
3638 | for (i = 0; i < SET_CONFIG_TRIES; ++i) { | |
3639 | ||
3640 | /* ep0 maxpacket size may change; let the HCD know about it. | |
3641 | * Other endpoints will be handled by re-enumeration. */ | |
fc721f51 | 3642 | usb_ep0_reinit(udev); |
1da177e4 | 3643 | ret = hub_port_init(parent_hub, udev, port1, i); |
dd4dd19e | 3644 | if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) |
1da177e4 LT |
3645 | break; |
3646 | } | |
3647 | clear_bit(port1, parent_hub->busy_bits); | |
d5cbad4b | 3648 | |
1da177e4 LT |
3649 | if (ret < 0) |
3650 | goto re_enumerate; | |
3651 | ||
3652 | /* Device might have changed firmware (DFU or similar) */ | |
eb764c4b | 3653 | if (descriptors_changed(udev, &descriptor)) { |
1da177e4 LT |
3654 | dev_info(&udev->dev, "device firmware changed\n"); |
3655 | udev->descriptor = descriptor; /* for disconnect() calls */ | |
3656 | goto re_enumerate; | |
3657 | } | |
4fe0387a AS |
3658 | |
3659 | /* Restore the device's previous configuration */ | |
1da177e4 LT |
3660 | if (!udev->actconfig) |
3661 | goto done; | |
3f0479e0 SS |
3662 | |
3663 | mutex_lock(&hcd->bandwidth_mutex); | |
3664 | ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); | |
3665 | if (ret < 0) { | |
3666 | dev_warn(&udev->dev, | |
3667 | "Busted HC? Not enough HCD resources for " | |
3668 | "old configuration.\n"); | |
3669 | mutex_unlock(&hcd->bandwidth_mutex); | |
3670 | goto re_enumerate; | |
3671 | } | |
1da177e4 LT |
3672 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
3673 | USB_REQ_SET_CONFIGURATION, 0, | |
3674 | udev->actconfig->desc.bConfigurationValue, 0, | |
3675 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
3676 | if (ret < 0) { | |
3677 | dev_err(&udev->dev, | |
3678 | "can't restore configuration #%d (error=%d)\n", | |
3679 | udev->actconfig->desc.bConfigurationValue, ret); | |
3f0479e0 | 3680 | mutex_unlock(&hcd->bandwidth_mutex); |
1da177e4 LT |
3681 | goto re_enumerate; |
3682 | } | |
3f0479e0 | 3683 | mutex_unlock(&hcd->bandwidth_mutex); |
1da177e4 LT |
3684 | usb_set_device_state(udev, USB_STATE_CONFIGURED); |
3685 | ||
4fe0387a AS |
3686 | /* Put interfaces back into the same altsettings as before. |
3687 | * Don't bother to send the Set-Interface request for interfaces | |
3688 | * that were already in altsetting 0; besides being unnecessary, | |
3689 | * many devices can't handle it. Instead just reset the host-side | |
3690 | * endpoint state. | |
3691 | */ | |
1da177e4 | 3692 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
3f0479e0 SS |
3693 | struct usb_host_config *config = udev->actconfig; |
3694 | struct usb_interface *intf = config->interface[i]; | |
1da177e4 LT |
3695 | struct usb_interface_descriptor *desc; |
3696 | ||
1da177e4 | 3697 | desc = &intf->cur_altsetting->desc; |
4fe0387a AS |
3698 | if (desc->bAlternateSetting == 0) { |
3699 | usb_disable_interface(udev, intf, true); | |
3700 | usb_enable_interface(udev, intf, true); | |
3701 | ret = 0; | |
3702 | } else { | |
04a723ea SS |
3703 | /* Let the bandwidth allocation function know that this |
3704 | * device has been reset, and it will have to use | |
3705 | * alternate setting 0 as the current alternate setting. | |
3f0479e0 | 3706 | */ |
04a723ea | 3707 | intf->resetting_device = 1; |
4fe0387a AS |
3708 | ret = usb_set_interface(udev, desc->bInterfaceNumber, |
3709 | desc->bAlternateSetting); | |
04a723ea | 3710 | intf->resetting_device = 0; |
4fe0387a | 3711 | } |
1da177e4 LT |
3712 | if (ret < 0) { |
3713 | dev_err(&udev->dev, "failed to restore interface %d " | |
3714 | "altsetting %d (error=%d)\n", | |
3715 | desc->bInterfaceNumber, | |
3716 | desc->bAlternateSetting, | |
3717 | ret); | |
3718 | goto re_enumerate; | |
3719 | } | |
3720 | } | |
3721 | ||
3722 | done: | |
1da177e4 LT |
3723 | return 0; |
3724 | ||
3725 | re_enumerate: | |
3726 | hub_port_logical_disconnect(parent_hub, port1); | |
3727 | return -ENODEV; | |
3728 | } | |
79efa097 AS |
3729 | |
3730 | /** | |
742120c6 | 3731 | * usb_reset_device - warn interface drivers and perform a USB port reset |
79efa097 | 3732 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
79efa097 AS |
3733 | * |
3734 | * Warns all drivers bound to registered interfaces (using their pre_reset | |
3735 | * method), performs the port reset, and then lets the drivers know that | |
3736 | * the reset is over (using their post_reset method). | |
3737 | * | |
742120c6 | 3738 | * Return value is the same as for usb_reset_and_verify_device(). |
79efa097 AS |
3739 | * |
3740 | * The caller must own the device lock. For example, it's safe to use | |
3741 | * this from a driver probe() routine after downloading new firmware. | |
3742 | * For calls that might not occur during probe(), drivers should lock | |
3743 | * the device using usb_lock_device_for_reset(). | |
78d9a487 AS |
3744 | * |
3745 | * If an interface is currently being probed or disconnected, we assume | |
3746 | * its driver knows how to handle resets. For all other interfaces, | |
3747 | * if the driver doesn't have pre_reset and post_reset methods then | |
3748 | * we attempt to unbind it and rebind afterward. | |
79efa097 | 3749 | */ |
742120c6 | 3750 | int usb_reset_device(struct usb_device *udev) |
79efa097 AS |
3751 | { |
3752 | int ret; | |
852c4b43 | 3753 | int i; |
79efa097 AS |
3754 | struct usb_host_config *config = udev->actconfig; |
3755 | ||
3756 | if (udev->state == USB_STATE_NOTATTACHED || | |
3757 | udev->state == USB_STATE_SUSPENDED) { | |
3758 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
3759 | udev->state); | |
3760 | return -EINVAL; | |
3761 | } | |
3762 | ||
645daaab | 3763 | /* Prevent autosuspend during the reset */ |
94fcda1f | 3764 | usb_autoresume_device(udev); |
645daaab | 3765 | |
79efa097 | 3766 | if (config) { |
79efa097 | 3767 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { |
852c4b43 AS |
3768 | struct usb_interface *cintf = config->interface[i]; |
3769 | struct usb_driver *drv; | |
78d9a487 | 3770 | int unbind = 0; |
852c4b43 AS |
3771 | |
3772 | if (cintf->dev.driver) { | |
79efa097 | 3773 | drv = to_usb_driver(cintf->dev.driver); |
78d9a487 AS |
3774 | if (drv->pre_reset && drv->post_reset) |
3775 | unbind = (drv->pre_reset)(cintf); | |
3776 | else if (cintf->condition == | |
3777 | USB_INTERFACE_BOUND) | |
3778 | unbind = 1; | |
3779 | if (unbind) | |
3780 | usb_forced_unbind_intf(cintf); | |
79efa097 AS |
3781 | } |
3782 | } | |
3783 | } | |
3784 | ||
742120c6 | 3785 | ret = usb_reset_and_verify_device(udev); |
79efa097 AS |
3786 | |
3787 | if (config) { | |
79efa097 | 3788 | for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { |
852c4b43 AS |
3789 | struct usb_interface *cintf = config->interface[i]; |
3790 | struct usb_driver *drv; | |
78d9a487 | 3791 | int rebind = cintf->needs_binding; |
852c4b43 | 3792 | |
78d9a487 | 3793 | if (!rebind && cintf->dev.driver) { |
79efa097 AS |
3794 | drv = to_usb_driver(cintf->dev.driver); |
3795 | if (drv->post_reset) | |
78d9a487 AS |
3796 | rebind = (drv->post_reset)(cintf); |
3797 | else if (cintf->condition == | |
3798 | USB_INTERFACE_BOUND) | |
3799 | rebind = 1; | |
79efa097 | 3800 | } |
6c640945 | 3801 | if (ret == 0 && rebind) |
78d9a487 | 3802 | usb_rebind_intf(cintf); |
79efa097 AS |
3803 | } |
3804 | } | |
3805 | ||
94fcda1f | 3806 | usb_autosuspend_device(udev); |
79efa097 AS |
3807 | return ret; |
3808 | } | |
742120c6 | 3809 | EXPORT_SYMBOL_GPL(usb_reset_device); |
dc023dce IPG |
3810 | |
3811 | ||
3812 | /** | |
3813 | * usb_queue_reset_device - Reset a USB device from an atomic context | |
3814 | * @iface: USB interface belonging to the device to reset | |
3815 | * | |
3816 | * This function can be used to reset a USB device from an atomic | |
3817 | * context, where usb_reset_device() won't work (as it blocks). | |
3818 | * | |
3819 | * Doing a reset via this method is functionally equivalent to calling | |
3820 | * usb_reset_device(), except for the fact that it is delayed to a | |
3821 | * workqueue. This means that any drivers bound to other interfaces | |
3822 | * might be unbound, as well as users from usbfs in user space. | |
3823 | * | |
3824 | * Corner cases: | |
3825 | * | |
3826 | * - Scheduling two resets at the same time from two different drivers | |
3827 | * attached to two different interfaces of the same device is | |
3828 | * possible; depending on how the driver attached to each interface | |
3829 | * handles ->pre_reset(), the second reset might happen or not. | |
3830 | * | |
3831 | * - If a driver is unbound and it had a pending reset, the reset will | |
3832 | * be cancelled. | |
3833 | * | |
3834 | * - This function can be called during .probe() or .disconnect() | |
3835 | * times. On return from .disconnect(), any pending resets will be | |
3836 | * cancelled. | |
3837 | * | |
3838 | * There is no no need to lock/unlock the @reset_ws as schedule_work() | |
3839 | * does its own. | |
3840 | * | |
3841 | * NOTE: We don't do any reference count tracking because it is not | |
3842 | * needed. The lifecycle of the work_struct is tied to the | |
3843 | * usb_interface. Before destroying the interface we cancel the | |
3844 | * work_struct, so the fact that work_struct is queued and or | |
3845 | * running means the interface (and thus, the device) exist and | |
3846 | * are referenced. | |
3847 | */ | |
3848 | void usb_queue_reset_device(struct usb_interface *iface) | |
3849 | { | |
3850 | schedule_work(&iface->reset_ws); | |
3851 | } | |
3852 | EXPORT_SYMBOL_GPL(usb_queue_reset_device); |