]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * USB hub driver. | |
3 | * | |
4 | * (C) Copyright 1999 Linus Torvalds | |
5 | * (C) Copyright 1999 Johannes Erdfelt | |
6 | * (C) Copyright 1999 Gregory P. Smith | |
7 | * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) | |
8 | * | |
9 | */ | |
10 | ||
1da177e4 LT |
11 | #include <linux/kernel.h> |
12 | #include <linux/errno.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/moduleparam.h> | |
15 | #include <linux/completion.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/list.h> | |
18 | #include <linux/slab.h> | |
1da177e4 LT |
19 | #include <linux/ioctl.h> |
20 | #include <linux/usb.h> | |
21 | #include <linux/usbdevice_fs.h> | |
27729aad | 22 | #include <linux/usb/hcd.h> |
93362a87 | 23 | #include <linux/usb/quirks.h> |
9c8d6178 | 24 | #include <linux/kthread.h> |
4186ecf8 | 25 | #include <linux/mutex.h> |
7dfb7103 | 26 | #include <linux/freezer.h> |
1da177e4 | 27 | |
1da177e4 LT |
28 | #include <asm/uaccess.h> |
29 | #include <asm/byteorder.h> | |
30 | ||
31 | #include "usb.h" | |
1da177e4 | 32 | |
f2a383e4 GKH |
33 | /* if we are in debug mode, always announce new devices */ |
34 | #ifdef DEBUG | |
35 | #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES | |
36 | #define CONFIG_USB_ANNOUNCE_NEW_DEVICES | |
37 | #endif | |
38 | #endif | |
39 | ||
1bb5f66b AS |
40 | struct usb_hub { |
41 | struct device *intfdev; /* the "interface" device */ | |
42 | struct usb_device *hdev; | |
e8054854 | 43 | struct kref kref; |
1bb5f66b AS |
44 | struct urb *urb; /* for interrupt polling pipe */ |
45 | ||
46 | /* buffer for urb ... with extra space in case of babble */ | |
47 | char (*buffer)[8]; | |
1bb5f66b AS |
48 | union { |
49 | struct usb_hub_status hub; | |
50 | struct usb_port_status port; | |
51 | } *status; /* buffer for status reports */ | |
db90e7a1 | 52 | struct mutex status_mutex; /* for the status buffer */ |
1bb5f66b AS |
53 | |
54 | int error; /* last reported error */ | |
55 | int nerrors; /* track consecutive errors */ | |
56 | ||
57 | struct list_head event_list; /* hubs w/data or errs ready */ | |
58 | unsigned long event_bits[1]; /* status change bitmask */ | |
59 | unsigned long change_bits[1]; /* ports with logical connect | |
60 | status change */ | |
61 | unsigned long busy_bits[1]; /* ports being reset or | |
62 | resumed */ | |
253e0572 AS |
63 | unsigned long removed_bits[1]; /* ports with a "removed" |
64 | device present */ | |
1bb5f66b AS |
65 | #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */ |
66 | #error event_bits[] is too short! | |
67 | #endif | |
68 | ||
69 | struct usb_hub_descriptor *descriptor; /* class descriptor */ | |
70 | struct usb_tt tt; /* Transaction Translator */ | |
71 | ||
72 | unsigned mA_per_port; /* current for each child */ | |
73 | ||
74 | unsigned limited_power:1; | |
75 | unsigned quiescing:1; | |
e8054854 | 76 | unsigned disconnected:1; |
1bb5f66b AS |
77 | |
78 | unsigned has_indicators:1; | |
79 | u8 indicator[USB_MAXCHILDREN]; | |
6d5aefb8 | 80 | struct delayed_work leds; |
8520f380 | 81 | struct delayed_work init_work; |
7cbe5dca | 82 | void **port_owners; |
1bb5f66b AS |
83 | }; |
84 | ||
85 | ||
1da177e4 | 86 | /* Protect struct usb_device->state and ->children members |
9ad3d6cc | 87 | * Note: Both are also protected by ->dev.sem, except that ->state can |
1da177e4 LT |
88 | * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ |
89 | static DEFINE_SPINLOCK(device_state_lock); | |
90 | ||
91 | /* khubd's worklist and its lock */ | |
92 | static DEFINE_SPINLOCK(hub_event_lock); | |
93 | static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ | |
94 | ||
95 | /* Wakes up khubd */ | |
96 | static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); | |
97 | ||
9c8d6178 | 98 | static struct task_struct *khubd_task; |
1da177e4 LT |
99 | |
100 | /* cycle leds on hubs that aren't blinking for attention */ | |
101 | static int blinkenlights = 0; | |
102 | module_param (blinkenlights, bool, S_IRUGO); | |
103 | MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); | |
104 | ||
fd7c519d JK |
105 | /* |
106 | * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about | |
107 | * 10 seconds to send reply for the initial 64-byte descriptor request. | |
108 | */ | |
109 | /* define initial 64-byte descriptor request timeout in milliseconds */ | |
110 | static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; | |
111 | module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); | |
b9cef6c3 WF |
112 | MODULE_PARM_DESC(initial_descriptor_timeout, |
113 | "initial 64-byte descriptor request timeout in milliseconds " | |
114 | "(default 5000 - 5.0 seconds)"); | |
fd7c519d | 115 | |
1da177e4 LT |
116 | /* |
117 | * As of 2.6.10 we introduce a new USB device initialization scheme which | |
118 | * closely resembles the way Windows works. Hopefully it will be compatible | |
119 | * with a wider range of devices than the old scheme. However some previously | |
120 | * working devices may start giving rise to "device not accepting address" | |
121 | * errors; if that happens the user can try the old scheme by adjusting the | |
122 | * following module parameters. | |
123 | * | |
124 | * For maximum flexibility there are two boolean parameters to control the | |
125 | * hub driver's behavior. On the first initialization attempt, if the | |
126 | * "old_scheme_first" parameter is set then the old scheme will be used, | |
127 | * otherwise the new scheme is used. If that fails and "use_both_schemes" | |
128 | * is set, then the driver will make another attempt, using the other scheme. | |
129 | */ | |
130 | static int old_scheme_first = 0; | |
131 | module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); | |
132 | MODULE_PARM_DESC(old_scheme_first, | |
133 | "start with the old device initialization scheme"); | |
134 | ||
135 | static int use_both_schemes = 1; | |
136 | module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); | |
137 | MODULE_PARM_DESC(use_both_schemes, | |
138 | "try the other device initialization scheme if the " | |
139 | "first one fails"); | |
140 | ||
32fe0198 AS |
141 | /* Mutual exclusion for EHCI CF initialization. This interferes with |
142 | * port reset on some companion controllers. | |
143 | */ | |
144 | DECLARE_RWSEM(ehci_cf_port_reset_rwsem); | |
145 | EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); | |
146 | ||
948fea37 AS |
147 | #define HUB_DEBOUNCE_TIMEOUT 1500 |
148 | #define HUB_DEBOUNCE_STEP 25 | |
149 | #define HUB_DEBOUNCE_STABLE 100 | |
150 | ||
1da177e4 | 151 | |
742120c6 ML |
152 | static int usb_reset_and_verify_device(struct usb_device *udev); |
153 | ||
404d5b18 | 154 | static inline char *portspeed(int portstatus) |
1da177e4 | 155 | { |
288ead45 | 156 | if (portstatus & USB_PORT_STAT_HIGH_SPEED) |
1da177e4 | 157 | return "480 Mb/s"; |
288ead45 | 158 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) |
1da177e4 | 159 | return "1.5 Mb/s"; |
288ead45 | 160 | else if (portstatus & USB_PORT_STAT_SUPER_SPEED) |
d2e9b4d6 | 161 | return "5.0 Gb/s"; |
1da177e4 LT |
162 | else |
163 | return "12 Mb/s"; | |
164 | } | |
1da177e4 LT |
165 | |
166 | /* Note that hdev or one of its children must be locked! */ | |
25118084 | 167 | static struct usb_hub *hdev_to_hub(struct usb_device *hdev) |
1da177e4 | 168 | { |
25118084 AS |
169 | if (!hdev || !hdev->actconfig) |
170 | return NULL; | |
1da177e4 LT |
171 | return usb_get_intfdata(hdev->actconfig->interface[0]); |
172 | } | |
173 | ||
174 | /* USB 2.0 spec Section 11.24.4.5 */ | |
175 | static int get_hub_descriptor(struct usb_device *hdev, void *data, int size) | |
176 | { | |
177 | int i, ret; | |
178 | ||
179 | for (i = 0; i < 3; i++) { | |
180 | ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
181 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, | |
182 | USB_DT_HUB << 8, 0, data, size, | |
183 | USB_CTRL_GET_TIMEOUT); | |
184 | if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) | |
185 | return ret; | |
186 | } | |
187 | return -EINVAL; | |
188 | } | |
189 | ||
190 | /* | |
191 | * USB 2.0 spec Section 11.24.2.1 | |
192 | */ | |
193 | static int clear_hub_feature(struct usb_device *hdev, int feature) | |
194 | { | |
195 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
196 | USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); | |
197 | } | |
198 | ||
199 | /* | |
200 | * USB 2.0 spec Section 11.24.2.2 | |
201 | */ | |
202 | static int clear_port_feature(struct usb_device *hdev, int port1, int feature) | |
203 | { | |
204 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
205 | USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, | |
206 | NULL, 0, 1000); | |
207 | } | |
208 | ||
209 | /* | |
210 | * USB 2.0 spec Section 11.24.2.13 | |
211 | */ | |
212 | static int set_port_feature(struct usb_device *hdev, int port1, int feature) | |
213 | { | |
214 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
215 | USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, | |
216 | NULL, 0, 1000); | |
217 | } | |
218 | ||
219 | /* | |
220 | * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 | |
221 | * for info about using port indicators | |
222 | */ | |
223 | static void set_port_led( | |
224 | struct usb_hub *hub, | |
225 | int port1, | |
226 | int selector | |
227 | ) | |
228 | { | |
229 | int status = set_port_feature(hub->hdev, (selector << 8) | port1, | |
230 | USB_PORT_FEAT_INDICATOR); | |
231 | if (status < 0) | |
232 | dev_dbg (hub->intfdev, | |
233 | "port %d indicator %s status %d\n", | |
234 | port1, | |
235 | ({ char *s; switch (selector) { | |
236 | case HUB_LED_AMBER: s = "amber"; break; | |
237 | case HUB_LED_GREEN: s = "green"; break; | |
238 | case HUB_LED_OFF: s = "off"; break; | |
239 | case HUB_LED_AUTO: s = "auto"; break; | |
240 | default: s = "??"; break; | |
241 | }; s; }), | |
242 | status); | |
243 | } | |
244 | ||
245 | #define LED_CYCLE_PERIOD ((2*HZ)/3) | |
246 | ||
c4028958 | 247 | static void led_work (struct work_struct *work) |
1da177e4 | 248 | { |
c4028958 DH |
249 | struct usb_hub *hub = |
250 | container_of(work, struct usb_hub, leds.work); | |
1da177e4 LT |
251 | struct usb_device *hdev = hub->hdev; |
252 | unsigned i; | |
253 | unsigned changed = 0; | |
254 | int cursor = -1; | |
255 | ||
256 | if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) | |
257 | return; | |
258 | ||
259 | for (i = 0; i < hub->descriptor->bNbrPorts; i++) { | |
260 | unsigned selector, mode; | |
261 | ||
262 | /* 30%-50% duty cycle */ | |
263 | ||
264 | switch (hub->indicator[i]) { | |
265 | /* cycle marker */ | |
266 | case INDICATOR_CYCLE: | |
267 | cursor = i; | |
268 | selector = HUB_LED_AUTO; | |
269 | mode = INDICATOR_AUTO; | |
270 | break; | |
271 | /* blinking green = sw attention */ | |
272 | case INDICATOR_GREEN_BLINK: | |
273 | selector = HUB_LED_GREEN; | |
274 | mode = INDICATOR_GREEN_BLINK_OFF; | |
275 | break; | |
276 | case INDICATOR_GREEN_BLINK_OFF: | |
277 | selector = HUB_LED_OFF; | |
278 | mode = INDICATOR_GREEN_BLINK; | |
279 | break; | |
280 | /* blinking amber = hw attention */ | |
281 | case INDICATOR_AMBER_BLINK: | |
282 | selector = HUB_LED_AMBER; | |
283 | mode = INDICATOR_AMBER_BLINK_OFF; | |
284 | break; | |
285 | case INDICATOR_AMBER_BLINK_OFF: | |
286 | selector = HUB_LED_OFF; | |
287 | mode = INDICATOR_AMBER_BLINK; | |
288 | break; | |
289 | /* blink green/amber = reserved */ | |
290 | case INDICATOR_ALT_BLINK: | |
291 | selector = HUB_LED_GREEN; | |
292 | mode = INDICATOR_ALT_BLINK_OFF; | |
293 | break; | |
294 | case INDICATOR_ALT_BLINK_OFF: | |
295 | selector = HUB_LED_AMBER; | |
296 | mode = INDICATOR_ALT_BLINK; | |
297 | break; | |
298 | default: | |
299 | continue; | |
300 | } | |
301 | if (selector != HUB_LED_AUTO) | |
302 | changed = 1; | |
303 | set_port_led(hub, i + 1, selector); | |
304 | hub->indicator[i] = mode; | |
305 | } | |
306 | if (!changed && blinkenlights) { | |
307 | cursor++; | |
308 | cursor %= hub->descriptor->bNbrPorts; | |
309 | set_port_led(hub, cursor + 1, HUB_LED_GREEN); | |
310 | hub->indicator[cursor] = INDICATOR_CYCLE; | |
311 | changed++; | |
312 | } | |
313 | if (changed) | |
314 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); | |
315 | } | |
316 | ||
317 | /* use a short timeout for hub/port status fetches */ | |
318 | #define USB_STS_TIMEOUT 1000 | |
319 | #define USB_STS_RETRIES 5 | |
320 | ||
321 | /* | |
322 | * USB 2.0 spec Section 11.24.2.6 | |
323 | */ | |
324 | static int get_hub_status(struct usb_device *hdev, | |
325 | struct usb_hub_status *data) | |
326 | { | |
327 | int i, status = -ETIMEDOUT; | |
328 | ||
329 | for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { | |
330 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
331 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, | |
332 | data, sizeof(*data), USB_STS_TIMEOUT); | |
333 | } | |
334 | return status; | |
335 | } | |
336 | ||
337 | /* | |
338 | * USB 2.0 spec Section 11.24.2.7 | |
339 | */ | |
340 | static int get_port_status(struct usb_device *hdev, int port1, | |
341 | struct usb_port_status *data) | |
342 | { | |
343 | int i, status = -ETIMEDOUT; | |
344 | ||
345 | for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { | |
346 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
347 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, | |
348 | data, sizeof(*data), USB_STS_TIMEOUT); | |
349 | } | |
350 | return status; | |
351 | } | |
352 | ||
3eb14915 AS |
353 | static int hub_port_status(struct usb_hub *hub, int port1, |
354 | u16 *status, u16 *change) | |
355 | { | |
356 | int ret; | |
357 | ||
358 | mutex_lock(&hub->status_mutex); | |
359 | ret = get_port_status(hub->hdev, port1, &hub->status->port); | |
360 | if (ret < 4) { | |
361 | dev_err(hub->intfdev, | |
362 | "%s failed (err = %d)\n", __func__, ret); | |
363 | if (ret >= 0) | |
364 | ret = -EIO; | |
365 | } else { | |
366 | *status = le16_to_cpu(hub->status->port.wPortStatus); | |
367 | *change = le16_to_cpu(hub->status->port.wPortChange); | |
368 | ret = 0; | |
369 | } | |
370 | mutex_unlock(&hub->status_mutex); | |
371 | return ret; | |
372 | } | |
373 | ||
1da177e4 LT |
374 | static void kick_khubd(struct usb_hub *hub) |
375 | { | |
376 | unsigned long flags; | |
377 | ||
378 | spin_lock_irqsave(&hub_event_lock, flags); | |
2e2c5eea | 379 | if (!hub->disconnected && list_empty(&hub->event_list)) { |
1da177e4 | 380 | list_add_tail(&hub->event_list, &hub_event_list); |
8e4ceb38 AS |
381 | |
382 | /* Suppress autosuspend until khubd runs */ | |
383 | usb_autopm_get_interface_no_resume( | |
384 | to_usb_interface(hub->intfdev)); | |
1da177e4 LT |
385 | wake_up(&khubd_wait); |
386 | } | |
387 | spin_unlock_irqrestore(&hub_event_lock, flags); | |
388 | } | |
389 | ||
390 | void usb_kick_khubd(struct usb_device *hdev) | |
391 | { | |
25118084 AS |
392 | struct usb_hub *hub = hdev_to_hub(hdev); |
393 | ||
394 | if (hub) | |
395 | kick_khubd(hub); | |
1da177e4 LT |
396 | } |
397 | ||
398 | ||
399 | /* completion function, fires on port status changes and various faults */ | |
7d12e780 | 400 | static void hub_irq(struct urb *urb) |
1da177e4 | 401 | { |
ec17cf1c | 402 | struct usb_hub *hub = urb->context; |
e015268d | 403 | int status = urb->status; |
71d2718f | 404 | unsigned i; |
1da177e4 LT |
405 | unsigned long bits; |
406 | ||
e015268d | 407 | switch (status) { |
1da177e4 LT |
408 | case -ENOENT: /* synchronous unlink */ |
409 | case -ECONNRESET: /* async unlink */ | |
410 | case -ESHUTDOWN: /* hardware going away */ | |
411 | return; | |
412 | ||
413 | default: /* presumably an error */ | |
414 | /* Cause a hub reset after 10 consecutive errors */ | |
e015268d | 415 | dev_dbg (hub->intfdev, "transfer --> %d\n", status); |
1da177e4 LT |
416 | if ((++hub->nerrors < 10) || hub->error) |
417 | goto resubmit; | |
e015268d | 418 | hub->error = status; |
1da177e4 | 419 | /* FALL THROUGH */ |
ec17cf1c | 420 | |
1da177e4 LT |
421 | /* let khubd handle things */ |
422 | case 0: /* we got data: port status changed */ | |
423 | bits = 0; | |
424 | for (i = 0; i < urb->actual_length; ++i) | |
425 | bits |= ((unsigned long) ((*hub->buffer)[i])) | |
426 | << (i*8); | |
427 | hub->event_bits[0] = bits; | |
428 | break; | |
429 | } | |
430 | ||
431 | hub->nerrors = 0; | |
432 | ||
433 | /* Something happened, let khubd figure it out */ | |
434 | kick_khubd(hub); | |
435 | ||
436 | resubmit: | |
437 | if (hub->quiescing) | |
438 | return; | |
439 | ||
440 | if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 | |
441 | && status != -ENODEV && status != -EPERM) | |
442 | dev_err (hub->intfdev, "resubmit --> %d\n", status); | |
443 | } | |
444 | ||
445 | /* USB 2.0 spec Section 11.24.2.3 */ | |
446 | static inline int | |
447 | hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) | |
448 | { | |
c2f6595f | 449 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
1da177e4 LT |
450 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, |
451 | tt, NULL, 0, 1000); | |
452 | } | |
453 | ||
454 | /* | |
455 | * enumeration blocks khubd for a long time. we use keventd instead, since | |
456 | * long blocking there is the exception, not the rule. accordingly, HCDs | |
457 | * talking to TTs must queue control transfers (not just bulk and iso), so | |
458 | * both can talk to the same hub concurrently. | |
459 | */ | |
cb88a1b8 | 460 | static void hub_tt_work(struct work_struct *work) |
1da177e4 | 461 | { |
c4028958 | 462 | struct usb_hub *hub = |
cb88a1b8 | 463 | container_of(work, struct usb_hub, tt.clear_work); |
1da177e4 | 464 | unsigned long flags; |
55e5fdfa | 465 | int limit = 100; |
1da177e4 LT |
466 | |
467 | spin_lock_irqsave (&hub->tt.lock, flags); | |
55e5fdfa | 468 | while (--limit && !list_empty (&hub->tt.clear_list)) { |
d0f830d3 | 469 | struct list_head *next; |
1da177e4 LT |
470 | struct usb_tt_clear *clear; |
471 | struct usb_device *hdev = hub->hdev; | |
cb88a1b8 | 472 | const struct hc_driver *drv; |
1da177e4 LT |
473 | int status; |
474 | ||
d0f830d3 HS |
475 | next = hub->tt.clear_list.next; |
476 | clear = list_entry (next, struct usb_tt_clear, clear_list); | |
1da177e4 LT |
477 | list_del (&clear->clear_list); |
478 | ||
479 | /* drop lock so HCD can concurrently report other TT errors */ | |
480 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
481 | status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); | |
1da177e4 LT |
482 | if (status) |
483 | dev_err (&hdev->dev, | |
484 | "clear tt %d (%04x) error %d\n", | |
485 | clear->tt, clear->devinfo, status); | |
cb88a1b8 AS |
486 | |
487 | /* Tell the HCD, even if the operation failed */ | |
488 | drv = clear->hcd->driver; | |
489 | if (drv->clear_tt_buffer_complete) | |
490 | (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); | |
491 | ||
1bc3c9e1 | 492 | kfree(clear); |
cb88a1b8 | 493 | spin_lock_irqsave(&hub->tt.lock, flags); |
1da177e4 LT |
494 | } |
495 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
496 | } | |
497 | ||
498 | /** | |
cb88a1b8 AS |
499 | * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub |
500 | * @urb: an URB associated with the failed or incomplete split transaction | |
1da177e4 LT |
501 | * |
502 | * High speed HCDs use this to tell the hub driver that some split control or | |
503 | * bulk transaction failed in a way that requires clearing internal state of | |
504 | * a transaction translator. This is normally detected (and reported) from | |
505 | * interrupt context. | |
506 | * | |
507 | * It may not be possible for that hub to handle additional full (or low) | |
508 | * speed transactions until that state is fully cleared out. | |
509 | */ | |
cb88a1b8 | 510 | int usb_hub_clear_tt_buffer(struct urb *urb) |
1da177e4 | 511 | { |
cb88a1b8 AS |
512 | struct usb_device *udev = urb->dev; |
513 | int pipe = urb->pipe; | |
1da177e4 LT |
514 | struct usb_tt *tt = udev->tt; |
515 | unsigned long flags; | |
516 | struct usb_tt_clear *clear; | |
517 | ||
518 | /* we've got to cope with an arbitrary number of pending TT clears, | |
519 | * since each TT has "at least two" buffers that can need it (and | |
520 | * there can be many TTs per hub). even if they're uncommon. | |
521 | */ | |
54e6ecb2 | 522 | if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { |
1da177e4 LT |
523 | dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); |
524 | /* FIXME recover somehow ... RESET_TT? */ | |
cb88a1b8 | 525 | return -ENOMEM; |
1da177e4 LT |
526 | } |
527 | ||
528 | /* info that CLEAR_TT_BUFFER needs */ | |
529 | clear->tt = tt->multi ? udev->ttport : 1; | |
530 | clear->devinfo = usb_pipeendpoint (pipe); | |
531 | clear->devinfo |= udev->devnum << 4; | |
532 | clear->devinfo |= usb_pipecontrol (pipe) | |
533 | ? (USB_ENDPOINT_XFER_CONTROL << 11) | |
534 | : (USB_ENDPOINT_XFER_BULK << 11); | |
535 | if (usb_pipein (pipe)) | |
536 | clear->devinfo |= 1 << 15; | |
cb88a1b8 AS |
537 | |
538 | /* info for completion callback */ | |
539 | clear->hcd = bus_to_hcd(udev->bus); | |
540 | clear->ep = urb->ep; | |
541 | ||
1da177e4 LT |
542 | /* tell keventd to clear state for this TT */ |
543 | spin_lock_irqsave (&tt->lock, flags); | |
544 | list_add_tail (&clear->clear_list, &tt->clear_list); | |
cb88a1b8 | 545 | schedule_work(&tt->clear_work); |
1da177e4 | 546 | spin_unlock_irqrestore (&tt->lock, flags); |
cb88a1b8 | 547 | return 0; |
1da177e4 | 548 | } |
cb88a1b8 | 549 | EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); |
1da177e4 | 550 | |
8520f380 AS |
551 | /* If do_delay is false, return the number of milliseconds the caller |
552 | * needs to delay. | |
553 | */ | |
554 | static unsigned hub_power_on(struct usb_hub *hub, bool do_delay) | |
1da177e4 LT |
555 | { |
556 | int port1; | |
b789696a | 557 | unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; |
8520f380 | 558 | unsigned delay; |
4489a571 AS |
559 | u16 wHubCharacteristics = |
560 | le16_to_cpu(hub->descriptor->wHubCharacteristics); | |
561 | ||
562 | /* Enable power on each port. Some hubs have reserved values | |
563 | * of LPSM (> 2) in their descriptors, even though they are | |
564 | * USB 2.0 hubs. Some hubs do not implement port-power switching | |
565 | * but only emulate it. In all cases, the ports won't work | |
566 | * unless we send these messages to the hub. | |
567 | */ | |
568 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) | |
1da177e4 | 569 | dev_dbg(hub->intfdev, "enabling power on all ports\n"); |
4489a571 AS |
570 | else |
571 | dev_dbg(hub->intfdev, "trying to enable port power on " | |
572 | "non-switchable hub\n"); | |
573 | for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) | |
574 | set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); | |
1da177e4 | 575 | |
b789696a | 576 | /* Wait at least 100 msec for power to become stable */ |
8520f380 AS |
577 | delay = max(pgood_delay, (unsigned) 100); |
578 | if (do_delay) | |
579 | msleep(delay); | |
580 | return delay; | |
1da177e4 LT |
581 | } |
582 | ||
1da177e4 LT |
583 | static int hub_hub_status(struct usb_hub *hub, |
584 | u16 *status, u16 *change) | |
585 | { | |
586 | int ret; | |
587 | ||
db90e7a1 | 588 | mutex_lock(&hub->status_mutex); |
1da177e4 LT |
589 | ret = get_hub_status(hub->hdev, &hub->status->hub); |
590 | if (ret < 0) | |
591 | dev_err (hub->intfdev, | |
441b62c1 | 592 | "%s failed (err = %d)\n", __func__, ret); |
1da177e4 LT |
593 | else { |
594 | *status = le16_to_cpu(hub->status->hub.wHubStatus); | |
595 | *change = le16_to_cpu(hub->status->hub.wHubChange); | |
596 | ret = 0; | |
597 | } | |
db90e7a1 | 598 | mutex_unlock(&hub->status_mutex); |
1da177e4 LT |
599 | return ret; |
600 | } | |
601 | ||
8b28c752 AS |
602 | static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) |
603 | { | |
604 | struct usb_device *hdev = hub->hdev; | |
0458d5b4 | 605 | int ret = 0; |
8b28c752 | 606 | |
0458d5b4 | 607 | if (hdev->children[port1-1] && set_state) |
8b28c752 AS |
608 | usb_set_device_state(hdev->children[port1-1], |
609 | USB_STATE_NOTATTACHED); | |
0458d5b4 AS |
610 | if (!hub->error) |
611 | ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); | |
8b28c752 AS |
612 | if (ret) |
613 | dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", | |
0458d5b4 | 614 | port1, ret); |
8b28c752 AS |
615 | return ret; |
616 | } | |
617 | ||
0458d5b4 AS |
618 | /* |
619 | * Disable a port and mark a logical connnect-change event, so that some | |
620 | * time later khubd will disconnect() any existing usb_device on the port | |
621 | * and will re-enumerate if there actually is a device attached. | |
622 | */ | |
623 | static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) | |
624 | { | |
625 | dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); | |
626 | hub_port_disable(hub, port1, 1); | |
7d069b7d | 627 | |
0458d5b4 AS |
628 | /* FIXME let caller ask to power down the port: |
629 | * - some devices won't enumerate without a VBUS power cycle | |
630 | * - SRP saves power that way | |
631 | * - ... new call, TBD ... | |
632 | * That's easy if this hub can switch power per-port, and | |
633 | * khubd reactivates the port later (timer, SRP, etc). | |
634 | * Powerdown must be optional, because of reset/DFU. | |
635 | */ | |
636 | ||
637 | set_bit(port1, hub->change_bits); | |
638 | kick_khubd(hub); | |
639 | } | |
640 | ||
253e0572 AS |
641 | /** |
642 | * usb_remove_device - disable a device's port on its parent hub | |
643 | * @udev: device to be disabled and removed | |
644 | * Context: @udev locked, must be able to sleep. | |
645 | * | |
646 | * After @udev's port has been disabled, khubd is notified and it will | |
647 | * see that the device has been disconnected. When the device is | |
648 | * physically unplugged and something is plugged in, the events will | |
649 | * be received and processed normally. | |
650 | */ | |
651 | int usb_remove_device(struct usb_device *udev) | |
652 | { | |
653 | struct usb_hub *hub; | |
654 | struct usb_interface *intf; | |
655 | ||
656 | if (!udev->parent) /* Can't remove a root hub */ | |
657 | return -EINVAL; | |
658 | hub = hdev_to_hub(udev->parent); | |
659 | intf = to_usb_interface(hub->intfdev); | |
660 | ||
661 | usb_autopm_get_interface(intf); | |
662 | set_bit(udev->portnum, hub->removed_bits); | |
663 | hub_port_logical_disconnect(hub, udev->portnum); | |
664 | usb_autopm_put_interface(intf); | |
665 | return 0; | |
666 | } | |
667 | ||
6ee0b270 | 668 | enum hub_activation_type { |
8e4ceb38 | 669 | HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ |
8520f380 | 670 | HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, |
6ee0b270 | 671 | }; |
5e6effae | 672 | |
8520f380 AS |
673 | static void hub_init_func2(struct work_struct *ws); |
674 | static void hub_init_func3(struct work_struct *ws); | |
675 | ||
f2835219 | 676 | static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) |
5e6effae AS |
677 | { |
678 | struct usb_device *hdev = hub->hdev; | |
653a39d1 SS |
679 | struct usb_hcd *hcd; |
680 | int ret; | |
5e6effae | 681 | int port1; |
f2835219 | 682 | int status; |
948fea37 | 683 | bool need_debounce_delay = false; |
8520f380 AS |
684 | unsigned delay; |
685 | ||
686 | /* Continue a partial initialization */ | |
687 | if (type == HUB_INIT2) | |
688 | goto init2; | |
689 | if (type == HUB_INIT3) | |
690 | goto init3; | |
5e6effae | 691 | |
f2835219 AS |
692 | /* After a resume, port power should still be on. |
693 | * For any other type of activation, turn it on. | |
694 | */ | |
8520f380 AS |
695 | if (type != HUB_RESUME) { |
696 | ||
697 | /* Speed up system boot by using a delayed_work for the | |
698 | * hub's initial power-up delays. This is pretty awkward | |
699 | * and the implementation looks like a home-brewed sort of | |
700 | * setjmp/longjmp, but it saves at least 100 ms for each | |
701 | * root hub (assuming usbcore is compiled into the kernel | |
702 | * rather than as a module). It adds up. | |
703 | * | |
704 | * This can't be done for HUB_RESUME or HUB_RESET_RESUME | |
705 | * because for those activation types the ports have to be | |
706 | * operational when we return. In theory this could be done | |
707 | * for HUB_POST_RESET, but it's easier not to. | |
708 | */ | |
709 | if (type == HUB_INIT) { | |
710 | delay = hub_power_on(hub, false); | |
711 | PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2); | |
712 | schedule_delayed_work(&hub->init_work, | |
713 | msecs_to_jiffies(delay)); | |
61fbeba1 AS |
714 | |
715 | /* Suppress autosuspend until init is done */ | |
8e4ceb38 AS |
716 | usb_autopm_get_interface_no_resume( |
717 | to_usb_interface(hub->intfdev)); | |
8520f380 | 718 | return; /* Continues at init2: below */ |
653a39d1 SS |
719 | } else if (type == HUB_RESET_RESUME) { |
720 | /* The internal host controller state for the hub device | |
721 | * may be gone after a host power loss on system resume. | |
722 | * Update the device's info so the HW knows it's a hub. | |
723 | */ | |
724 | hcd = bus_to_hcd(hdev->bus); | |
725 | if (hcd->driver->update_hub_device) { | |
726 | ret = hcd->driver->update_hub_device(hcd, hdev, | |
727 | &hub->tt, GFP_NOIO); | |
728 | if (ret < 0) { | |
729 | dev_err(hub->intfdev, "Host not " | |
730 | "accepting hub info " | |
731 | "update.\n"); | |
732 | dev_err(hub->intfdev, "LS/FS devices " | |
733 | "and hubs may not work " | |
734 | "under this hub\n."); | |
735 | } | |
736 | } | |
737 | hub_power_on(hub, true); | |
8520f380 AS |
738 | } else { |
739 | hub_power_on(hub, true); | |
740 | } | |
741 | } | |
742 | init2: | |
f2835219 | 743 | |
6ee0b270 AS |
744 | /* Check each port and set hub->change_bits to let khubd know |
745 | * which ports need attention. | |
5e6effae AS |
746 | */ |
747 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
748 | struct usb_device *udev = hdev->children[port1-1]; | |
5e6effae AS |
749 | u16 portstatus, portchange; |
750 | ||
6ee0b270 AS |
751 | portstatus = portchange = 0; |
752 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
753 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) | |
754 | dev_dbg(hub->intfdev, | |
755 | "port %d: status %04x change %04x\n", | |
756 | port1, portstatus, portchange); | |
757 | ||
758 | /* After anything other than HUB_RESUME (i.e., initialization | |
759 | * or any sort of reset), every port should be disabled. | |
760 | * Unconnected ports should likewise be disabled (paranoia), | |
761 | * and so should ports for which we have no usb_device. | |
762 | */ | |
763 | if ((portstatus & USB_PORT_STAT_ENABLE) && ( | |
764 | type != HUB_RESUME || | |
765 | !(portstatus & USB_PORT_STAT_CONNECTION) || | |
766 | !udev || | |
767 | udev->state == USB_STATE_NOTATTACHED)) { | |
9f0a6cd3 AX |
768 | /* |
769 | * USB3 protocol ports will automatically transition | |
770 | * to Enabled state when detect an USB3.0 device attach. | |
771 | * Do not disable USB3 protocol ports. | |
772 | * FIXME: USB3 root hub and external hubs are treated | |
773 | * differently here. | |
774 | */ | |
775 | if (hdev->descriptor.bDeviceProtocol != 3 || | |
776 | (!hdev->parent && | |
777 | !(portstatus & USB_PORT_STAT_SUPER_SPEED))) { | |
778 | clear_port_feature(hdev, port1, | |
779 | USB_PORT_FEAT_ENABLE); | |
780 | portstatus &= ~USB_PORT_STAT_ENABLE; | |
85f0ff46 SS |
781 | } else { |
782 | /* Pretend that power was lost for USB3 devs */ | |
783 | portstatus &= ~USB_PORT_STAT_ENABLE; | |
9f0a6cd3 | 784 | } |
5e6effae AS |
785 | } |
786 | ||
948fea37 AS |
787 | /* Clear status-change flags; we'll debounce later */ |
788 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
789 | need_debounce_delay = true; | |
790 | clear_port_feature(hub->hdev, port1, | |
791 | USB_PORT_FEAT_C_CONNECTION); | |
792 | } | |
793 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
794 | need_debounce_delay = true; | |
795 | clear_port_feature(hub->hdev, port1, | |
796 | USB_PORT_FEAT_C_ENABLE); | |
797 | } | |
798 | ||
253e0572 AS |
799 | /* We can forget about a "removed" device when there's a |
800 | * physical disconnect or the connect status changes. | |
801 | */ | |
802 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
803 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
804 | clear_bit(port1, hub->removed_bits); | |
805 | ||
6ee0b270 AS |
806 | if (!udev || udev->state == USB_STATE_NOTATTACHED) { |
807 | /* Tell khubd to disconnect the device or | |
808 | * check for a new connection | |
809 | */ | |
810 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) | |
811 | set_bit(port1, hub->change_bits); | |
812 | ||
813 | } else if (portstatus & USB_PORT_STAT_ENABLE) { | |
814 | /* The power session apparently survived the resume. | |
815 | * If there was an overcurrent or suspend change | |
816 | * (i.e., remote wakeup request), have khubd | |
817 | * take care of it. | |
818 | */ | |
819 | if (portchange) | |
820 | set_bit(port1, hub->change_bits); | |
5e6effae | 821 | |
6ee0b270 | 822 | } else if (udev->persist_enabled) { |
6ee0b270 | 823 | #ifdef CONFIG_PM |
5e6effae | 824 | udev->reset_resume = 1; |
6ee0b270 | 825 | #endif |
8808f00c AS |
826 | set_bit(port1, hub->change_bits); |
827 | ||
6ee0b270 AS |
828 | } else { |
829 | /* The power session is gone; tell khubd */ | |
830 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
831 | set_bit(port1, hub->change_bits); | |
5e6effae | 832 | } |
5e6effae AS |
833 | } |
834 | ||
948fea37 AS |
835 | /* If no port-status-change flags were set, we don't need any |
836 | * debouncing. If flags were set we can try to debounce the | |
837 | * ports all at once right now, instead of letting khubd do them | |
838 | * one at a time later on. | |
839 | * | |
840 | * If any port-status changes do occur during this delay, khubd | |
841 | * will see them later and handle them normally. | |
842 | */ | |
8520f380 AS |
843 | if (need_debounce_delay) { |
844 | delay = HUB_DEBOUNCE_STABLE; | |
845 | ||
846 | /* Don't do a long sleep inside a workqueue routine */ | |
847 | if (type == HUB_INIT2) { | |
848 | PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3); | |
849 | schedule_delayed_work(&hub->init_work, | |
850 | msecs_to_jiffies(delay)); | |
851 | return; /* Continues at init3: below */ | |
852 | } else { | |
853 | msleep(delay); | |
854 | } | |
855 | } | |
856 | init3: | |
f2835219 AS |
857 | hub->quiescing = 0; |
858 | ||
859 | status = usb_submit_urb(hub->urb, GFP_NOIO); | |
860 | if (status < 0) | |
861 | dev_err(hub->intfdev, "activate --> %d\n", status); | |
862 | if (hub->has_indicators && blinkenlights) | |
863 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); | |
864 | ||
865 | /* Scan all ports that need attention */ | |
866 | kick_khubd(hub); | |
8e4ceb38 AS |
867 | |
868 | /* Allow autosuspend if it was suppressed */ | |
869 | if (type <= HUB_INIT3) | |
870 | usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); | |
5e6effae AS |
871 | } |
872 | ||
8520f380 AS |
873 | /* Implement the continuations for the delays above */ |
874 | static void hub_init_func2(struct work_struct *ws) | |
875 | { | |
876 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
877 | ||
878 | hub_activate(hub, HUB_INIT2); | |
879 | } | |
880 | ||
881 | static void hub_init_func3(struct work_struct *ws) | |
882 | { | |
883 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
884 | ||
885 | hub_activate(hub, HUB_INIT3); | |
886 | } | |
887 | ||
4330354f AS |
888 | enum hub_quiescing_type { |
889 | HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND | |
890 | }; | |
891 | ||
892 | static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) | |
893 | { | |
894 | struct usb_device *hdev = hub->hdev; | |
895 | int i; | |
896 | ||
8520f380 AS |
897 | cancel_delayed_work_sync(&hub->init_work); |
898 | ||
4330354f AS |
899 | /* khubd and related activity won't re-trigger */ |
900 | hub->quiescing = 1; | |
901 | ||
902 | if (type != HUB_SUSPEND) { | |
903 | /* Disconnect all the children */ | |
904 | for (i = 0; i < hdev->maxchild; ++i) { | |
905 | if (hdev->children[i]) | |
906 | usb_disconnect(&hdev->children[i]); | |
907 | } | |
908 | } | |
909 | ||
910 | /* Stop khubd and related activity */ | |
911 | usb_kill_urb(hub->urb); | |
912 | if (hub->has_indicators) | |
913 | cancel_delayed_work_sync(&hub->leds); | |
914 | if (hub->tt.hub) | |
cb88a1b8 | 915 | cancel_work_sync(&hub->tt.clear_work); |
4330354f AS |
916 | } |
917 | ||
3eb14915 AS |
918 | /* caller has locked the hub device */ |
919 | static int hub_pre_reset(struct usb_interface *intf) | |
920 | { | |
921 | struct usb_hub *hub = usb_get_intfdata(intf); | |
922 | ||
4330354f | 923 | hub_quiesce(hub, HUB_PRE_RESET); |
f07600cf | 924 | return 0; |
7d069b7d AS |
925 | } |
926 | ||
927 | /* caller has locked the hub device */ | |
f07600cf | 928 | static int hub_post_reset(struct usb_interface *intf) |
7d069b7d | 929 | { |
7de18d8b AS |
930 | struct usb_hub *hub = usb_get_intfdata(intf); |
931 | ||
f2835219 | 932 | hub_activate(hub, HUB_POST_RESET); |
f07600cf | 933 | return 0; |
7d069b7d AS |
934 | } |
935 | ||
1da177e4 LT |
936 | static int hub_configure(struct usb_hub *hub, |
937 | struct usb_endpoint_descriptor *endpoint) | |
938 | { | |
b356b7c7 | 939 | struct usb_hcd *hcd; |
1da177e4 LT |
940 | struct usb_device *hdev = hub->hdev; |
941 | struct device *hub_dev = hub->intfdev; | |
942 | u16 hubstatus, hubchange; | |
74ad9bd2 | 943 | u16 wHubCharacteristics; |
1da177e4 LT |
944 | unsigned int pipe; |
945 | int maxp, ret; | |
7cbe5dca | 946 | char *message = "out of memory"; |
1da177e4 | 947 | |
d697cdda | 948 | hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); |
1da177e4 | 949 | if (!hub->buffer) { |
1da177e4 LT |
950 | ret = -ENOMEM; |
951 | goto fail; | |
952 | } | |
953 | ||
954 | hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); | |
955 | if (!hub->status) { | |
1da177e4 LT |
956 | ret = -ENOMEM; |
957 | goto fail; | |
958 | } | |
db90e7a1 | 959 | mutex_init(&hub->status_mutex); |
1da177e4 LT |
960 | |
961 | hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); | |
962 | if (!hub->descriptor) { | |
1da177e4 LT |
963 | ret = -ENOMEM; |
964 | goto fail; | |
965 | } | |
966 | ||
967 | /* Request the entire hub descriptor. | |
968 | * hub->descriptor can handle USB_MAXCHILDREN ports, | |
969 | * but the hub can/will return fewer bytes here. | |
970 | */ | |
971 | ret = get_hub_descriptor(hdev, hub->descriptor, | |
972 | sizeof(*hub->descriptor)); | |
973 | if (ret < 0) { | |
974 | message = "can't read hub descriptor"; | |
975 | goto fail; | |
976 | } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { | |
977 | message = "hub has too many ports!"; | |
978 | ret = -ENODEV; | |
979 | goto fail; | |
980 | } | |
981 | ||
982 | hdev->maxchild = hub->descriptor->bNbrPorts; | |
983 | dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, | |
984 | (hdev->maxchild == 1) ? "" : "s"); | |
985 | ||
7cbe5dca AS |
986 | hub->port_owners = kzalloc(hdev->maxchild * sizeof(void *), GFP_KERNEL); |
987 | if (!hub->port_owners) { | |
988 | ret = -ENOMEM; | |
989 | goto fail; | |
990 | } | |
991 | ||
74ad9bd2 | 992 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
1da177e4 | 993 | |
74ad9bd2 | 994 | if (wHubCharacteristics & HUB_CHAR_COMPOUND) { |
1da177e4 LT |
995 | int i; |
996 | char portstr [USB_MAXCHILDREN + 1]; | |
997 | ||
998 | for (i = 0; i < hdev->maxchild; i++) | |
999 | portstr[i] = hub->descriptor->DeviceRemovable | |
1000 | [((i + 1) / 8)] & (1 << ((i + 1) % 8)) | |
1001 | ? 'F' : 'R'; | |
1002 | portstr[hdev->maxchild] = 0; | |
1003 | dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); | |
1004 | } else | |
1005 | dev_dbg(hub_dev, "standalone hub\n"); | |
1006 | ||
74ad9bd2 | 1007 | switch (wHubCharacteristics & HUB_CHAR_LPSM) { |
1da177e4 LT |
1008 | case 0x00: |
1009 | dev_dbg(hub_dev, "ganged power switching\n"); | |
1010 | break; | |
1011 | case 0x01: | |
1012 | dev_dbg(hub_dev, "individual port power switching\n"); | |
1013 | break; | |
1014 | case 0x02: | |
1015 | case 0x03: | |
1016 | dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); | |
1017 | break; | |
1018 | } | |
1019 | ||
74ad9bd2 | 1020 | switch (wHubCharacteristics & HUB_CHAR_OCPM) { |
1da177e4 LT |
1021 | case 0x00: |
1022 | dev_dbg(hub_dev, "global over-current protection\n"); | |
1023 | break; | |
1024 | case 0x08: | |
1025 | dev_dbg(hub_dev, "individual port over-current protection\n"); | |
1026 | break; | |
1027 | case 0x10: | |
1028 | case 0x18: | |
1029 | dev_dbg(hub_dev, "no over-current protection\n"); | |
1030 | break; | |
1031 | } | |
1032 | ||
1033 | spin_lock_init (&hub->tt.lock); | |
1034 | INIT_LIST_HEAD (&hub->tt.clear_list); | |
cb88a1b8 | 1035 | INIT_WORK(&hub->tt.clear_work, hub_tt_work); |
1da177e4 LT |
1036 | switch (hdev->descriptor.bDeviceProtocol) { |
1037 | case 0: | |
1038 | break; | |
1039 | case 1: | |
1040 | dev_dbg(hub_dev, "Single TT\n"); | |
1041 | hub->tt.hub = hdev; | |
1042 | break; | |
1043 | case 2: | |
1044 | ret = usb_set_interface(hdev, 0, 1); | |
1045 | if (ret == 0) { | |
1046 | dev_dbg(hub_dev, "TT per port\n"); | |
1047 | hub->tt.multi = 1; | |
1048 | } else | |
1049 | dev_err(hub_dev, "Using single TT (err %d)\n", | |
1050 | ret); | |
1051 | hub->tt.hub = hdev; | |
1052 | break; | |
d2e9b4d6 SS |
1053 | case 3: |
1054 | /* USB 3.0 hubs don't have a TT */ | |
1055 | break; | |
1da177e4 LT |
1056 | default: |
1057 | dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", | |
1058 | hdev->descriptor.bDeviceProtocol); | |
1059 | break; | |
1060 | } | |
1061 | ||
e09711ae | 1062 | /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ |
74ad9bd2 | 1063 | switch (wHubCharacteristics & HUB_CHAR_TTTT) { |
e09711ae DB |
1064 | case HUB_TTTT_8_BITS: |
1065 | if (hdev->descriptor.bDeviceProtocol != 0) { | |
1066 | hub->tt.think_time = 666; | |
1067 | dev_dbg(hub_dev, "TT requires at most %d " | |
1068 | "FS bit times (%d ns)\n", | |
1069 | 8, hub->tt.think_time); | |
1070 | } | |
1da177e4 | 1071 | break; |
e09711ae DB |
1072 | case HUB_TTTT_16_BITS: |
1073 | hub->tt.think_time = 666 * 2; | |
1074 | dev_dbg(hub_dev, "TT requires at most %d " | |
1075 | "FS bit times (%d ns)\n", | |
1076 | 16, hub->tt.think_time); | |
1da177e4 | 1077 | break; |
e09711ae DB |
1078 | case HUB_TTTT_24_BITS: |
1079 | hub->tt.think_time = 666 * 3; | |
1080 | dev_dbg(hub_dev, "TT requires at most %d " | |
1081 | "FS bit times (%d ns)\n", | |
1082 | 24, hub->tt.think_time); | |
1da177e4 | 1083 | break; |
e09711ae DB |
1084 | case HUB_TTTT_32_BITS: |
1085 | hub->tt.think_time = 666 * 4; | |
1086 | dev_dbg(hub_dev, "TT requires at most %d " | |
1087 | "FS bit times (%d ns)\n", | |
1088 | 32, hub->tt.think_time); | |
1da177e4 LT |
1089 | break; |
1090 | } | |
1091 | ||
1092 | /* probe() zeroes hub->indicator[] */ | |
74ad9bd2 | 1093 | if (wHubCharacteristics & HUB_CHAR_PORTIND) { |
1da177e4 LT |
1094 | hub->has_indicators = 1; |
1095 | dev_dbg(hub_dev, "Port indicators are supported\n"); | |
1096 | } | |
1097 | ||
1098 | dev_dbg(hub_dev, "power on to power good time: %dms\n", | |
1099 | hub->descriptor->bPwrOn2PwrGood * 2); | |
1100 | ||
1101 | /* power budgeting mostly matters with bus-powered hubs, | |
1102 | * and battery-powered root hubs (may provide just 8 mA). | |
1103 | */ | |
1104 | ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); | |
55c52718 | 1105 | if (ret < 2) { |
1da177e4 LT |
1106 | message = "can't get hub status"; |
1107 | goto fail; | |
1108 | } | |
7d35b929 AS |
1109 | le16_to_cpus(&hubstatus); |
1110 | if (hdev == hdev->bus->root_hub) { | |
55c52718 AS |
1111 | if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) |
1112 | hub->mA_per_port = 500; | |
1113 | else { | |
1114 | hub->mA_per_port = hdev->bus_mA; | |
1115 | hub->limited_power = 1; | |
1116 | } | |
7d35b929 | 1117 | } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
1da177e4 LT |
1118 | dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", |
1119 | hub->descriptor->bHubContrCurrent); | |
55c52718 AS |
1120 | hub->limited_power = 1; |
1121 | if (hdev->maxchild > 0) { | |
1122 | int remaining = hdev->bus_mA - | |
1123 | hub->descriptor->bHubContrCurrent; | |
1124 | ||
1125 | if (remaining < hdev->maxchild * 100) | |
1126 | dev_warn(hub_dev, | |
1127 | "insufficient power available " | |
1128 | "to use all downstream ports\n"); | |
1129 | hub->mA_per_port = 100; /* 7.2.1.1 */ | |
1130 | } | |
1131 | } else { /* Self-powered external hub */ | |
1132 | /* FIXME: What about battery-powered external hubs that | |
1133 | * provide less current per port? */ | |
1134 | hub->mA_per_port = 500; | |
7d35b929 | 1135 | } |
55c52718 AS |
1136 | if (hub->mA_per_port < 500) |
1137 | dev_dbg(hub_dev, "%umA bus power budget for each child\n", | |
1138 | hub->mA_per_port); | |
1da177e4 | 1139 | |
b356b7c7 SS |
1140 | /* Update the HCD's internal representation of this hub before khubd |
1141 | * starts getting port status changes for devices under the hub. | |
1142 | */ | |
1143 | hcd = bus_to_hcd(hdev->bus); | |
1144 | if (hcd->driver->update_hub_device) { | |
1145 | ret = hcd->driver->update_hub_device(hcd, hdev, | |
1146 | &hub->tt, GFP_KERNEL); | |
1147 | if (ret < 0) { | |
1148 | message = "can't update HCD hub info"; | |
1149 | goto fail; | |
1150 | } | |
1151 | } | |
1152 | ||
1da177e4 LT |
1153 | ret = hub_hub_status(hub, &hubstatus, &hubchange); |
1154 | if (ret < 0) { | |
1155 | message = "can't get hub status"; | |
1156 | goto fail; | |
1157 | } | |
1158 | ||
1159 | /* local power status reports aren't always correct */ | |
1160 | if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) | |
1161 | dev_dbg(hub_dev, "local power source is %s\n", | |
1162 | (hubstatus & HUB_STATUS_LOCAL_POWER) | |
1163 | ? "lost (inactive)" : "good"); | |
1164 | ||
74ad9bd2 | 1165 | if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) |
1da177e4 LT |
1166 | dev_dbg(hub_dev, "%sover-current condition exists\n", |
1167 | (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); | |
1168 | ||
88fafff9 | 1169 | /* set up the interrupt endpoint |
1170 | * We use the EP's maxpacket size instead of (PORTS+1+7)/8 | |
1171 | * bytes as USB2.0[11.12.3] says because some hubs are known | |
1172 | * to send more data (and thus cause overflow). For root hubs, | |
1173 | * maxpktsize is defined in hcd.c's fake endpoint descriptors | |
1174 | * to be big enough for at least USB_MAXCHILDREN ports. */ | |
1da177e4 LT |
1175 | pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); |
1176 | maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); | |
1177 | ||
1178 | if (maxp > sizeof(*hub->buffer)) | |
1179 | maxp = sizeof(*hub->buffer); | |
1180 | ||
1181 | hub->urb = usb_alloc_urb(0, GFP_KERNEL); | |
1182 | if (!hub->urb) { | |
1da177e4 LT |
1183 | ret = -ENOMEM; |
1184 | goto fail; | |
1185 | } | |
1186 | ||
1187 | usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, | |
1188 | hub, endpoint->bInterval); | |
1da177e4 LT |
1189 | |
1190 | /* maybe cycle the hub leds */ | |
1191 | if (hub->has_indicators && blinkenlights) | |
1192 | hub->indicator [0] = INDICATOR_CYCLE; | |
1193 | ||
f2835219 | 1194 | hub_activate(hub, HUB_INIT); |
1da177e4 LT |
1195 | return 0; |
1196 | ||
1197 | fail: | |
1198 | dev_err (hub_dev, "config failed, %s (err %d)\n", | |
1199 | message, ret); | |
1200 | /* hub_disconnect() frees urb and descriptor */ | |
1201 | return ret; | |
1202 | } | |
1203 | ||
e8054854 AS |
1204 | static void hub_release(struct kref *kref) |
1205 | { | |
1206 | struct usb_hub *hub = container_of(kref, struct usb_hub, kref); | |
1207 | ||
1208 | usb_put_intf(to_usb_interface(hub->intfdev)); | |
1209 | kfree(hub); | |
1210 | } | |
1211 | ||
1da177e4 LT |
1212 | static unsigned highspeed_hubs; |
1213 | ||
1214 | static void hub_disconnect(struct usb_interface *intf) | |
1215 | { | |
1216 | struct usb_hub *hub = usb_get_intfdata (intf); | |
e8054854 AS |
1217 | |
1218 | /* Take the hub off the event list and don't let it be added again */ | |
1219 | spin_lock_irq(&hub_event_lock); | |
8e4ceb38 AS |
1220 | if (!list_empty(&hub->event_list)) { |
1221 | list_del_init(&hub->event_list); | |
1222 | usb_autopm_put_interface_no_suspend(intf); | |
1223 | } | |
e8054854 AS |
1224 | hub->disconnected = 1; |
1225 | spin_unlock_irq(&hub_event_lock); | |
1da177e4 | 1226 | |
7de18d8b AS |
1227 | /* Disconnect all children and quiesce the hub */ |
1228 | hub->error = 0; | |
4330354f | 1229 | hub_quiesce(hub, HUB_DISCONNECT); |
7de18d8b | 1230 | |
8b28c752 | 1231 | usb_set_intfdata (intf, NULL); |
7cbe5dca | 1232 | hub->hdev->maxchild = 0; |
1da177e4 | 1233 | |
e8054854 | 1234 | if (hub->hdev->speed == USB_SPEED_HIGH) |
1da177e4 LT |
1235 | highspeed_hubs--; |
1236 | ||
1da177e4 | 1237 | usb_free_urb(hub->urb); |
7cbe5dca | 1238 | kfree(hub->port_owners); |
1bc3c9e1 | 1239 | kfree(hub->descriptor); |
1bc3c9e1 | 1240 | kfree(hub->status); |
d697cdda | 1241 | kfree(hub->buffer); |
1da177e4 | 1242 | |
e8054854 | 1243 | kref_put(&hub->kref, hub_release); |
1da177e4 LT |
1244 | } |
1245 | ||
1246 | static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
1247 | { | |
1248 | struct usb_host_interface *desc; | |
1249 | struct usb_endpoint_descriptor *endpoint; | |
1250 | struct usb_device *hdev; | |
1251 | struct usb_hub *hub; | |
1252 | ||
1253 | desc = intf->cur_altsetting; | |
1254 | hdev = interface_to_usbdev(intf); | |
1255 | ||
088f7fec AS |
1256 | /* Hubs have proper suspend/resume support */ |
1257 | usb_enable_autosuspend(hdev); | |
1258 | ||
38f3ad5e | 1259 | if (hdev->level == MAX_TOPO_LEVEL) { |
b9cef6c3 WF |
1260 | dev_err(&intf->dev, |
1261 | "Unsupported bus topology: hub nested too deep\n"); | |
38f3ad5e FB |
1262 | return -E2BIG; |
1263 | } | |
1264 | ||
89ccbdc9 DB |
1265 | #ifdef CONFIG_USB_OTG_BLACKLIST_HUB |
1266 | if (hdev->parent) { | |
1267 | dev_warn(&intf->dev, "ignoring external hub\n"); | |
1268 | return -ENODEV; | |
1269 | } | |
1270 | #endif | |
1271 | ||
1da177e4 LT |
1272 | /* Some hubs have a subclass of 1, which AFAICT according to the */ |
1273 | /* specs is not defined, but it works */ | |
1274 | if ((desc->desc.bInterfaceSubClass != 0) && | |
1275 | (desc->desc.bInterfaceSubClass != 1)) { | |
1276 | descriptor_error: | |
1277 | dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); | |
1278 | return -EIO; | |
1279 | } | |
1280 | ||
1281 | /* Multiple endpoints? What kind of mutant ninja-hub is this? */ | |
1282 | if (desc->desc.bNumEndpoints != 1) | |
1283 | goto descriptor_error; | |
1284 | ||
1285 | endpoint = &desc->endpoint[0].desc; | |
1286 | ||
fbf81c29 LFC |
1287 | /* If it's not an interrupt in endpoint, we'd better punt! */ |
1288 | if (!usb_endpoint_is_int_in(endpoint)) | |
1da177e4 LT |
1289 | goto descriptor_error; |
1290 | ||
1291 | /* We found a hub */ | |
1292 | dev_info (&intf->dev, "USB hub found\n"); | |
1293 | ||
0a1ef3b5 | 1294 | hub = kzalloc(sizeof(*hub), GFP_KERNEL); |
1da177e4 LT |
1295 | if (!hub) { |
1296 | dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); | |
1297 | return -ENOMEM; | |
1298 | } | |
1299 | ||
e8054854 | 1300 | kref_init(&hub->kref); |
1da177e4 LT |
1301 | INIT_LIST_HEAD(&hub->event_list); |
1302 | hub->intfdev = &intf->dev; | |
1303 | hub->hdev = hdev; | |
c4028958 | 1304 | INIT_DELAYED_WORK(&hub->leds, led_work); |
8520f380 | 1305 | INIT_DELAYED_WORK(&hub->init_work, NULL); |
e8054854 | 1306 | usb_get_intf(intf); |
1da177e4 LT |
1307 | |
1308 | usb_set_intfdata (intf, hub); | |
40f122f3 | 1309 | intf->needs_remote_wakeup = 1; |
1da177e4 LT |
1310 | |
1311 | if (hdev->speed == USB_SPEED_HIGH) | |
1312 | highspeed_hubs++; | |
1313 | ||
1314 | if (hub_configure(hub, endpoint) >= 0) | |
1315 | return 0; | |
1316 | ||
1317 | hub_disconnect (intf); | |
1318 | return -ENODEV; | |
1319 | } | |
1320 | ||
c532b29a | 1321 | /* No BKL needed */ |
1da177e4 LT |
1322 | static int |
1323 | hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) | |
1324 | { | |
1325 | struct usb_device *hdev = interface_to_usbdev (intf); | |
1326 | ||
1327 | /* assert ifno == 0 (part of hub spec) */ | |
1328 | switch (code) { | |
1329 | case USBDEVFS_HUB_PORTINFO: { | |
1330 | struct usbdevfs_hub_portinfo *info = user_data; | |
1331 | int i; | |
1332 | ||
1333 | spin_lock_irq(&device_state_lock); | |
1334 | if (hdev->devnum <= 0) | |
1335 | info->nports = 0; | |
1336 | else { | |
1337 | info->nports = hdev->maxchild; | |
1338 | for (i = 0; i < info->nports; i++) { | |
1339 | if (hdev->children[i] == NULL) | |
1340 | info->port[i] = 0; | |
1341 | else | |
1342 | info->port[i] = | |
1343 | hdev->children[i]->devnum; | |
1344 | } | |
1345 | } | |
1346 | spin_unlock_irq(&device_state_lock); | |
1347 | ||
1348 | return info->nports + 1; | |
1349 | } | |
1350 | ||
1351 | default: | |
1352 | return -ENOSYS; | |
1353 | } | |
1354 | } | |
1355 | ||
7cbe5dca AS |
1356 | /* |
1357 | * Allow user programs to claim ports on a hub. When a device is attached | |
1358 | * to one of these "claimed" ports, the program will "own" the device. | |
1359 | */ | |
1360 | static int find_port_owner(struct usb_device *hdev, unsigned port1, | |
1361 | void ***ppowner) | |
1362 | { | |
1363 | if (hdev->state == USB_STATE_NOTATTACHED) | |
1364 | return -ENODEV; | |
1365 | if (port1 == 0 || port1 > hdev->maxchild) | |
1366 | return -EINVAL; | |
1367 | ||
1368 | /* This assumes that devices not managed by the hub driver | |
1369 | * will always have maxchild equal to 0. | |
1370 | */ | |
1371 | *ppowner = &(hdev_to_hub(hdev)->port_owners[port1 - 1]); | |
1372 | return 0; | |
1373 | } | |
1374 | ||
1375 | /* In the following three functions, the caller must hold hdev's lock */ | |
1376 | int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, void *owner) | |
1377 | { | |
1378 | int rc; | |
1379 | void **powner; | |
1380 | ||
1381 | rc = find_port_owner(hdev, port1, &powner); | |
1382 | if (rc) | |
1383 | return rc; | |
1384 | if (*powner) | |
1385 | return -EBUSY; | |
1386 | *powner = owner; | |
1387 | return rc; | |
1388 | } | |
1389 | ||
1390 | int usb_hub_release_port(struct usb_device *hdev, unsigned port1, void *owner) | |
1391 | { | |
1392 | int rc; | |
1393 | void **powner; | |
1394 | ||
1395 | rc = find_port_owner(hdev, port1, &powner); | |
1396 | if (rc) | |
1397 | return rc; | |
1398 | if (*powner != owner) | |
1399 | return -ENOENT; | |
1400 | *powner = NULL; | |
1401 | return rc; | |
1402 | } | |
1403 | ||
1404 | void usb_hub_release_all_ports(struct usb_device *hdev, void *owner) | |
1405 | { | |
1406 | int n; | |
1407 | void **powner; | |
1408 | ||
1409 | n = find_port_owner(hdev, 1, &powner); | |
1410 | if (n == 0) { | |
1411 | for (; n < hdev->maxchild; (++n, ++powner)) { | |
1412 | if (*powner == owner) | |
1413 | *powner = NULL; | |
1414 | } | |
1415 | } | |
1416 | } | |
1417 | ||
1418 | /* The caller must hold udev's lock */ | |
1419 | bool usb_device_is_owned(struct usb_device *udev) | |
1420 | { | |
1421 | struct usb_hub *hub; | |
1422 | ||
1423 | if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) | |
1424 | return false; | |
1425 | hub = hdev_to_hub(udev->parent); | |
1426 | return !!hub->port_owners[udev->portnum - 1]; | |
1427 | } | |
1428 | ||
1da177e4 | 1429 | |
1da177e4 LT |
1430 | static void recursively_mark_NOTATTACHED(struct usb_device *udev) |
1431 | { | |
1432 | int i; | |
1433 | ||
1434 | for (i = 0; i < udev->maxchild; ++i) { | |
1435 | if (udev->children[i]) | |
1436 | recursively_mark_NOTATTACHED(udev->children[i]); | |
1437 | } | |
9bbdf1e0 | 1438 | if (udev->state == USB_STATE_SUSPENDED) |
15123006 | 1439 | udev->active_duration -= jiffies; |
1da177e4 LT |
1440 | udev->state = USB_STATE_NOTATTACHED; |
1441 | } | |
1442 | ||
1443 | /** | |
1444 | * usb_set_device_state - change a device's current state (usbcore, hcds) | |
1445 | * @udev: pointer to device whose state should be changed | |
1446 | * @new_state: new state value to be stored | |
1447 | * | |
1448 | * udev->state is _not_ fully protected by the device lock. Although | |
1449 | * most transitions are made only while holding the lock, the state can | |
1450 | * can change to USB_STATE_NOTATTACHED at almost any time. This | |
1451 | * is so that devices can be marked as disconnected as soon as possible, | |
1452 | * without having to wait for any semaphores to be released. As a result, | |
1453 | * all changes to any device's state must be protected by the | |
1454 | * device_state_lock spinlock. | |
1455 | * | |
1456 | * Once a device has been added to the device tree, all changes to its state | |
1457 | * should be made using this routine. The state should _not_ be set directly. | |
1458 | * | |
1459 | * If udev->state is already USB_STATE_NOTATTACHED then no change is made. | |
1460 | * Otherwise udev->state is set to new_state, and if new_state is | |
1461 | * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set | |
1462 | * to USB_STATE_NOTATTACHED. | |
1463 | */ | |
1464 | void usb_set_device_state(struct usb_device *udev, | |
1465 | enum usb_device_state new_state) | |
1466 | { | |
1467 | unsigned long flags; | |
1468 | ||
1469 | spin_lock_irqsave(&device_state_lock, flags); | |
1470 | if (udev->state == USB_STATE_NOTATTACHED) | |
1471 | ; /* do nothing */ | |
b94dc6b5 | 1472 | else if (new_state != USB_STATE_NOTATTACHED) { |
fb669cc0 DB |
1473 | |
1474 | /* root hub wakeup capabilities are managed out-of-band | |
1475 | * and may involve silicon errata ... ignore them here. | |
1476 | */ | |
1477 | if (udev->parent) { | |
645daaab AS |
1478 | if (udev->state == USB_STATE_SUSPENDED |
1479 | || new_state == USB_STATE_SUSPENDED) | |
1480 | ; /* No change to wakeup settings */ | |
1481 | else if (new_state == USB_STATE_CONFIGURED) | |
16985408 | 1482 | device_set_wakeup_capable(&udev->dev, |
fb669cc0 DB |
1483 | (udev->actconfig->desc.bmAttributes |
1484 | & USB_CONFIG_ATT_WAKEUP)); | |
645daaab | 1485 | else |
16985408 | 1486 | device_set_wakeup_capable(&udev->dev, 0); |
fb669cc0 | 1487 | } |
15123006 SS |
1488 | if (udev->state == USB_STATE_SUSPENDED && |
1489 | new_state != USB_STATE_SUSPENDED) | |
1490 | udev->active_duration -= jiffies; | |
1491 | else if (new_state == USB_STATE_SUSPENDED && | |
1492 | udev->state != USB_STATE_SUSPENDED) | |
1493 | udev->active_duration += jiffies; | |
645daaab | 1494 | udev->state = new_state; |
b94dc6b5 | 1495 | } else |
1da177e4 LT |
1496 | recursively_mark_NOTATTACHED(udev); |
1497 | spin_unlock_irqrestore(&device_state_lock, flags); | |
1498 | } | |
6da9c990 | 1499 | EXPORT_SYMBOL_GPL(usb_set_device_state); |
1da177e4 | 1500 | |
8af548dc | 1501 | /* |
3b29b68b AS |
1502 | * Choose a device number. |
1503 | * | |
1504 | * Device numbers are used as filenames in usbfs. On USB-1.1 and | |
1505 | * USB-2.0 buses they are also used as device addresses, however on | |
1506 | * USB-3.0 buses the address is assigned by the controller hardware | |
1507 | * and it usually is not the same as the device number. | |
1508 | * | |
8af548dc IPG |
1509 | * WUSB devices are simple: they have no hubs behind, so the mapping |
1510 | * device <-> virtual port number becomes 1:1. Why? to simplify the | |
1511 | * life of the device connection logic in | |
1512 | * drivers/usb/wusbcore/devconnect.c. When we do the initial secret | |
1513 | * handshake we need to assign a temporary address in the unauthorized | |
1514 | * space. For simplicity we use the first virtual port number found to | |
1515 | * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] | |
1516 | * and that becomes it's address [X < 128] or its unauthorized address | |
1517 | * [X | 0x80]. | |
1518 | * | |
1519 | * We add 1 as an offset to the one-based USB-stack port number | |
1520 | * (zero-based wusb virtual port index) for two reasons: (a) dev addr | |
1521 | * 0 is reserved by USB for default address; (b) Linux's USB stack | |
1522 | * uses always #1 for the root hub of the controller. So USB stack's | |
1523 | * port #1, which is wusb virtual-port #0 has address #2. | |
c6515272 SS |
1524 | * |
1525 | * Devices connected under xHCI are not as simple. The host controller | |
1526 | * supports virtualization, so the hardware assigns device addresses and | |
1527 | * the HCD must setup data structures before issuing a set address | |
1528 | * command to the hardware. | |
8af548dc | 1529 | */ |
3b29b68b | 1530 | static void choose_devnum(struct usb_device *udev) |
1da177e4 LT |
1531 | { |
1532 | int devnum; | |
1533 | struct usb_bus *bus = udev->bus; | |
1534 | ||
1535 | /* If khubd ever becomes multithreaded, this will need a lock */ | |
8af548dc IPG |
1536 | if (udev->wusb) { |
1537 | devnum = udev->portnum + 1; | |
1538 | BUG_ON(test_bit(devnum, bus->devmap.devicemap)); | |
1539 | } else { | |
1540 | /* Try to allocate the next devnum beginning at | |
1541 | * bus->devnum_next. */ | |
1542 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, | |
1543 | bus->devnum_next); | |
1544 | if (devnum >= 128) | |
1545 | devnum = find_next_zero_bit(bus->devmap.devicemap, | |
1546 | 128, 1); | |
1547 | bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); | |
1548 | } | |
1da177e4 LT |
1549 | if (devnum < 128) { |
1550 | set_bit(devnum, bus->devmap.devicemap); | |
1551 | udev->devnum = devnum; | |
1552 | } | |
1553 | } | |
1554 | ||
3b29b68b | 1555 | static void release_devnum(struct usb_device *udev) |
1da177e4 LT |
1556 | { |
1557 | if (udev->devnum > 0) { | |
1558 | clear_bit(udev->devnum, udev->bus->devmap.devicemap); | |
1559 | udev->devnum = -1; | |
1560 | } | |
1561 | } | |
1562 | ||
3b29b68b | 1563 | static void update_devnum(struct usb_device *udev, int devnum) |
4953d141 DV |
1564 | { |
1565 | /* The address for a WUSB device is managed by wusbcore. */ | |
1566 | if (!udev->wusb) | |
1567 | udev->devnum = devnum; | |
1568 | } | |
1569 | ||
f7410ced HX |
1570 | static void hub_free_dev(struct usb_device *udev) |
1571 | { | |
1572 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
1573 | ||
1574 | /* Root hubs aren't real devices, so don't free HCD resources */ | |
1575 | if (hcd->driver->free_dev && udev->parent) | |
1576 | hcd->driver->free_dev(hcd, udev); | |
1577 | } | |
1578 | ||
1da177e4 LT |
1579 | /** |
1580 | * usb_disconnect - disconnect a device (usbcore-internal) | |
1581 | * @pdev: pointer to device being disconnected | |
1582 | * Context: !in_interrupt () | |
1583 | * | |
1584 | * Something got disconnected. Get rid of it and all of its children. | |
1585 | * | |
1586 | * If *pdev is a normal device then the parent hub must already be locked. | |
1587 | * If *pdev is a root hub then this routine will acquire the | |
1588 | * usb_bus_list_lock on behalf of the caller. | |
1589 | * | |
1590 | * Only hub drivers (including virtual root hub drivers for host | |
1591 | * controllers) should ever call this. | |
1592 | * | |
1593 | * This call is synchronous, and may not be used in an interrupt context. | |
1594 | */ | |
1595 | void usb_disconnect(struct usb_device **pdev) | |
1596 | { | |
1597 | struct usb_device *udev = *pdev; | |
1598 | int i; | |
1599 | ||
1600 | if (!udev) { | |
441b62c1 | 1601 | pr_debug ("%s nodev\n", __func__); |
1da177e4 LT |
1602 | return; |
1603 | } | |
1604 | ||
1605 | /* mark the device as inactive, so any further urb submissions for | |
1606 | * this device (and any of its children) will fail immediately. | |
1607 | * this quiesces everyting except pending urbs. | |
1608 | */ | |
1609 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
3b29b68b AS |
1610 | dev_info(&udev->dev, "USB disconnect, device number %d\n", |
1611 | udev->devnum); | |
1da177e4 | 1612 | |
9ad3d6cc AS |
1613 | usb_lock_device(udev); |
1614 | ||
1da177e4 LT |
1615 | /* Free up all the children before we remove this device */ |
1616 | for (i = 0; i < USB_MAXCHILDREN; i++) { | |
1617 | if (udev->children[i]) | |
1618 | usb_disconnect(&udev->children[i]); | |
1619 | } | |
1620 | ||
1621 | /* deallocate hcd/hardware state ... nuking all pending urbs and | |
1622 | * cleaning up all state associated with the current configuration | |
1623 | * so that the hardware is now fully quiesced. | |
1624 | */ | |
782da727 | 1625 | dev_dbg (&udev->dev, "unregistering device\n"); |
1da177e4 | 1626 | usb_disable_device(udev, 0); |
cde217a5 | 1627 | usb_hcd_synchronize_unlinks(udev); |
1da177e4 | 1628 | |
3b23dd6f | 1629 | usb_remove_ep_devs(&udev->ep0); |
782da727 AS |
1630 | usb_unlock_device(udev); |
1631 | ||
1632 | /* Unregister the device. The device driver is responsible | |
3b23dd6f AS |
1633 | * for de-configuring the device and invoking the remove-device |
1634 | * notifier chain (used by usbfs and possibly others). | |
782da727 AS |
1635 | */ |
1636 | device_del(&udev->dev); | |
3099e75a | 1637 | |
782da727 | 1638 | /* Free the device number and delete the parent's children[] |
1da177e4 LT |
1639 | * (or root_hub) pointer. |
1640 | */ | |
3b29b68b | 1641 | release_devnum(udev); |
1da177e4 LT |
1642 | |
1643 | /* Avoid races with recursively_mark_NOTATTACHED() */ | |
1644 | spin_lock_irq(&device_state_lock); | |
1645 | *pdev = NULL; | |
1646 | spin_unlock_irq(&device_state_lock); | |
1647 | ||
f7410ced HX |
1648 | hub_free_dev(udev); |
1649 | ||
782da727 | 1650 | put_device(&udev->dev); |
1da177e4 LT |
1651 | } |
1652 | ||
f2a383e4 | 1653 | #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES |
1da177e4 LT |
1654 | static void show_string(struct usb_device *udev, char *id, char *string) |
1655 | { | |
1656 | if (!string) | |
1657 | return; | |
1658 | dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); | |
1659 | } | |
1660 | ||
f2a383e4 GKH |
1661 | static void announce_device(struct usb_device *udev) |
1662 | { | |
1663 | dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", | |
1664 | le16_to_cpu(udev->descriptor.idVendor), | |
1665 | le16_to_cpu(udev->descriptor.idProduct)); | |
b9cef6c3 WF |
1666 | dev_info(&udev->dev, |
1667 | "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", | |
f2a383e4 GKH |
1668 | udev->descriptor.iManufacturer, |
1669 | udev->descriptor.iProduct, | |
1670 | udev->descriptor.iSerialNumber); | |
1671 | show_string(udev, "Product", udev->product); | |
1672 | show_string(udev, "Manufacturer", udev->manufacturer); | |
1673 | show_string(udev, "SerialNumber", udev->serial); | |
1674 | } | |
1da177e4 | 1675 | #else |
f2a383e4 | 1676 | static inline void announce_device(struct usb_device *udev) { } |
1da177e4 LT |
1677 | #endif |
1678 | ||
1da177e4 LT |
1679 | #ifdef CONFIG_USB_OTG |
1680 | #include "otg_whitelist.h" | |
1681 | #endif | |
1682 | ||
3ede760f | 1683 | /** |
8d8558d1 | 1684 | * usb_enumerate_device_otg - FIXME (usbcore-internal) |
3ede760f ON |
1685 | * @udev: newly addressed device (in ADDRESS state) |
1686 | * | |
8d8558d1 | 1687 | * Finish enumeration for On-The-Go devices |
3ede760f | 1688 | */ |
8d8558d1 | 1689 | static int usb_enumerate_device_otg(struct usb_device *udev) |
1da177e4 | 1690 | { |
d9d16e8a | 1691 | int err = 0; |
1da177e4 LT |
1692 | |
1693 | #ifdef CONFIG_USB_OTG | |
1694 | /* | |
1695 | * OTG-aware devices on OTG-capable root hubs may be able to use SRP, | |
1696 | * to wake us after we've powered off VBUS; and HNP, switching roles | |
1697 | * "host" to "peripheral". The OTG descriptor helps figure this out. | |
1698 | */ | |
1699 | if (!udev->bus->is_b_host | |
1700 | && udev->config | |
1701 | && udev->parent == udev->bus->root_hub) { | |
2eb5052e | 1702 | struct usb_otg_descriptor *desc = NULL; |
1da177e4 LT |
1703 | struct usb_bus *bus = udev->bus; |
1704 | ||
1705 | /* descriptor may appear anywhere in config */ | |
1706 | if (__usb_get_extra_descriptor (udev->rawdescriptors[0], | |
1707 | le16_to_cpu(udev->config[0].desc.wTotalLength), | |
1708 | USB_DT_OTG, (void **) &desc) == 0) { | |
1709 | if (desc->bmAttributes & USB_OTG_HNP) { | |
12c3da34 | 1710 | unsigned port1 = udev->portnum; |
fc849b85 | 1711 | |
1da177e4 LT |
1712 | dev_info(&udev->dev, |
1713 | "Dual-Role OTG device on %sHNP port\n", | |
1714 | (port1 == bus->otg_port) | |
1715 | ? "" : "non-"); | |
1716 | ||
1717 | /* enable HNP before suspend, it's simpler */ | |
1718 | if (port1 == bus->otg_port) | |
1719 | bus->b_hnp_enable = 1; | |
1720 | err = usb_control_msg(udev, | |
1721 | usb_sndctrlpipe(udev, 0), | |
1722 | USB_REQ_SET_FEATURE, 0, | |
1723 | bus->b_hnp_enable | |
1724 | ? USB_DEVICE_B_HNP_ENABLE | |
1725 | : USB_DEVICE_A_ALT_HNP_SUPPORT, | |
1726 | 0, NULL, 0, USB_CTRL_SET_TIMEOUT); | |
1727 | if (err < 0) { | |
1728 | /* OTG MESSAGE: report errors here, | |
1729 | * customize to match your product. | |
1730 | */ | |
1731 | dev_info(&udev->dev, | |
b9cef6c3 | 1732 | "can't set HNP mode: %d\n", |
1da177e4 LT |
1733 | err); |
1734 | bus->b_hnp_enable = 0; | |
1735 | } | |
1736 | } | |
1737 | } | |
1738 | } | |
1739 | ||
1740 | if (!is_targeted(udev)) { | |
1741 | ||
1742 | /* Maybe it can talk to us, though we can't talk to it. | |
1743 | * (Includes HNP test device.) | |
1744 | */ | |
1745 | if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { | |
634a84f8 | 1746 | err = usb_port_suspend(udev, PMSG_SUSPEND); |
1da177e4 LT |
1747 | if (err < 0) |
1748 | dev_dbg(&udev->dev, "HNP fail, %d\n", err); | |
1749 | } | |
ffcdc18d | 1750 | err = -ENOTSUPP; |
1da177e4 LT |
1751 | goto fail; |
1752 | } | |
d9d16e8a | 1753 | fail: |
1da177e4 | 1754 | #endif |
d9d16e8a IPG |
1755 | return err; |
1756 | } | |
1757 | ||
1758 | ||
1759 | /** | |
8d8558d1 | 1760 | * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) |
d9d16e8a IPG |
1761 | * @udev: newly addressed device (in ADDRESS state) |
1762 | * | |
1763 | * This is only called by usb_new_device() and usb_authorize_device() | |
1764 | * and FIXME -- all comments that apply to them apply here wrt to | |
1765 | * environment. | |
1766 | * | |
1767 | * If the device is WUSB and not authorized, we don't attempt to read | |
1768 | * the string descriptors, as they will be errored out by the device | |
1769 | * until it has been authorized. | |
1770 | */ | |
8d8558d1 | 1771 | static int usb_enumerate_device(struct usb_device *udev) |
d9d16e8a IPG |
1772 | { |
1773 | int err; | |
1da177e4 | 1774 | |
d9d16e8a IPG |
1775 | if (udev->config == NULL) { |
1776 | err = usb_get_configuration(udev); | |
1777 | if (err < 0) { | |
1778 | dev_err(&udev->dev, "can't read configurations, error %d\n", | |
1779 | err); | |
1780 | goto fail; | |
1781 | } | |
1782 | } | |
1783 | if (udev->wusb == 1 && udev->authorized == 0) { | |
1784 | udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1785 | udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1786 | udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1787 | } | |
1788 | else { | |
1789 | /* read the standard strings and cache them if present */ | |
1790 | udev->product = usb_cache_string(udev, udev->descriptor.iProduct); | |
1791 | udev->manufacturer = usb_cache_string(udev, | |
1792 | udev->descriptor.iManufacturer); | |
1793 | udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); | |
1794 | } | |
8d8558d1 | 1795 | err = usb_enumerate_device_otg(udev); |
d9d16e8a IPG |
1796 | fail: |
1797 | return err; | |
1798 | } | |
1799 | ||
1800 | ||
1801 | /** | |
1802 | * usb_new_device - perform initial device setup (usbcore-internal) | |
1803 | * @udev: newly addressed device (in ADDRESS state) | |
1804 | * | |
8d8558d1 AS |
1805 | * This is called with devices which have been detected but not fully |
1806 | * enumerated. The device descriptor is available, but not descriptors | |
d9d16e8a IPG |
1807 | * for any device configuration. The caller must have locked either |
1808 | * the parent hub (if udev is a normal device) or else the | |
1809 | * usb_bus_list_lock (if udev is a root hub). The parent's pointer to | |
1810 | * udev has already been installed, but udev is not yet visible through | |
1811 | * sysfs or other filesystem code. | |
1812 | * | |
1813 | * It will return if the device is configured properly or not. Zero if | |
1814 | * the interface was registered with the driver core; else a negative | |
1815 | * errno value. | |
1816 | * | |
1817 | * This call is synchronous, and may not be used in an interrupt context. | |
1818 | * | |
1819 | * Only the hub driver or root-hub registrar should ever call this. | |
1820 | */ | |
1821 | int usb_new_device(struct usb_device *udev) | |
1822 | { | |
1823 | int err; | |
1824 | ||
16985408 | 1825 | if (udev->parent) { |
16985408 DS |
1826 | /* Initialize non-root-hub device wakeup to disabled; |
1827 | * device (un)configuration controls wakeup capable | |
1828 | * sysfs power/wakeup controls wakeup enabled/disabled | |
1829 | */ | |
1830 | device_init_wakeup(&udev->dev, 0); | |
16985408 DS |
1831 | } |
1832 | ||
9bbdf1e0 AS |
1833 | /* Tell the runtime-PM framework the device is active */ |
1834 | pm_runtime_set_active(&udev->dev); | |
c08512c7 | 1835 | pm_runtime_get_noresume(&udev->dev); |
fcc4a01e | 1836 | pm_runtime_use_autosuspend(&udev->dev); |
9bbdf1e0 AS |
1837 | pm_runtime_enable(&udev->dev); |
1838 | ||
c08512c7 AS |
1839 | /* By default, forbid autosuspend for all devices. It will be |
1840 | * allowed for hubs during binding. | |
1841 | */ | |
1842 | usb_disable_autosuspend(udev); | |
1843 | ||
8d8558d1 | 1844 | err = usb_enumerate_device(udev); /* Read descriptors */ |
d9d16e8a IPG |
1845 | if (err < 0) |
1846 | goto fail; | |
c6515272 SS |
1847 | dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", |
1848 | udev->devnum, udev->bus->busnum, | |
1849 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
9f8b17e6 KS |
1850 | /* export the usbdev device-node for libusb */ |
1851 | udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, | |
1852 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
1853 | ||
6cd13201 AS |
1854 | /* Tell the world! */ |
1855 | announce_device(udev); | |
195af2cc | 1856 | |
927bc916 | 1857 | device_enable_async_suspend(&udev->dev); |
782da727 | 1858 | /* Register the device. The device driver is responsible |
3b23dd6f AS |
1859 | * for configuring the device and invoking the add-device |
1860 | * notifier chain (used by usbfs and possibly others). | |
782da727 | 1861 | */ |
9f8b17e6 | 1862 | err = device_add(&udev->dev); |
1da177e4 LT |
1863 | if (err) { |
1864 | dev_err(&udev->dev, "can't device_add, error %d\n", err); | |
1865 | goto fail; | |
1866 | } | |
9ad3d6cc | 1867 | |
3b23dd6f | 1868 | (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); |
c08512c7 AS |
1869 | usb_mark_last_busy(udev); |
1870 | pm_runtime_put_sync_autosuspend(&udev->dev); | |
c066475e | 1871 | return err; |
1da177e4 LT |
1872 | |
1873 | fail: | |
1874 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
9bbdf1e0 AS |
1875 | pm_runtime_disable(&udev->dev); |
1876 | pm_runtime_set_suspended(&udev->dev); | |
d9d16e8a | 1877 | return err; |
1da177e4 LT |
1878 | } |
1879 | ||
93993a0a IPG |
1880 | |
1881 | /** | |
fd39c86b RD |
1882 | * usb_deauthorize_device - deauthorize a device (usbcore-internal) |
1883 | * @usb_dev: USB device | |
1884 | * | |
1885 | * Move the USB device to a very basic state where interfaces are disabled | |
1886 | * and the device is in fact unconfigured and unusable. | |
93993a0a IPG |
1887 | * |
1888 | * We share a lock (that we have) with device_del(), so we need to | |
1889 | * defer its call. | |
1890 | */ | |
1891 | int usb_deauthorize_device(struct usb_device *usb_dev) | |
1892 | { | |
93993a0a IPG |
1893 | usb_lock_device(usb_dev); |
1894 | if (usb_dev->authorized == 0) | |
1895 | goto out_unauthorized; | |
da307123 | 1896 | |
93993a0a IPG |
1897 | usb_dev->authorized = 0; |
1898 | usb_set_configuration(usb_dev, -1); | |
da307123 AS |
1899 | |
1900 | kfree(usb_dev->product); | |
93993a0a | 1901 | usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
da307123 | 1902 | kfree(usb_dev->manufacturer); |
93993a0a | 1903 | usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
da307123 | 1904 | kfree(usb_dev->serial); |
93993a0a | 1905 | usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); |
da307123 AS |
1906 | |
1907 | usb_destroy_configuration(usb_dev); | |
93993a0a | 1908 | usb_dev->descriptor.bNumConfigurations = 0; |
da307123 | 1909 | |
93993a0a IPG |
1910 | out_unauthorized: |
1911 | usb_unlock_device(usb_dev); | |
1912 | return 0; | |
1913 | } | |
1914 | ||
1915 | ||
1916 | int usb_authorize_device(struct usb_device *usb_dev) | |
1917 | { | |
1918 | int result = 0, c; | |
da307123 | 1919 | |
93993a0a IPG |
1920 | usb_lock_device(usb_dev); |
1921 | if (usb_dev->authorized == 1) | |
1922 | goto out_authorized; | |
da307123 | 1923 | |
93993a0a IPG |
1924 | result = usb_autoresume_device(usb_dev); |
1925 | if (result < 0) { | |
1926 | dev_err(&usb_dev->dev, | |
1927 | "can't autoresume for authorization: %d\n", result); | |
1928 | goto error_autoresume; | |
1929 | } | |
1930 | result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); | |
1931 | if (result < 0) { | |
1932 | dev_err(&usb_dev->dev, "can't re-read device descriptor for " | |
1933 | "authorization: %d\n", result); | |
1934 | goto error_device_descriptor; | |
1935 | } | |
da307123 AS |
1936 | |
1937 | kfree(usb_dev->product); | |
1938 | usb_dev->product = NULL; | |
1939 | kfree(usb_dev->manufacturer); | |
1940 | usb_dev->manufacturer = NULL; | |
1941 | kfree(usb_dev->serial); | |
1942 | usb_dev->serial = NULL; | |
1943 | ||
93993a0a | 1944 | usb_dev->authorized = 1; |
8d8558d1 | 1945 | result = usb_enumerate_device(usb_dev); |
93993a0a | 1946 | if (result < 0) |
8d8558d1 | 1947 | goto error_enumerate; |
93993a0a IPG |
1948 | /* Choose and set the configuration. This registers the interfaces |
1949 | * with the driver core and lets interface drivers bind to them. | |
1950 | */ | |
b5ea060f | 1951 | c = usb_choose_configuration(usb_dev); |
93993a0a IPG |
1952 | if (c >= 0) { |
1953 | result = usb_set_configuration(usb_dev, c); | |
1954 | if (result) { | |
1955 | dev_err(&usb_dev->dev, | |
1956 | "can't set config #%d, error %d\n", c, result); | |
1957 | /* This need not be fatal. The user can try to | |
1958 | * set other configurations. */ | |
1959 | } | |
1960 | } | |
1961 | dev_info(&usb_dev->dev, "authorized to connect\n"); | |
da307123 | 1962 | |
8d8558d1 | 1963 | error_enumerate: |
93993a0a | 1964 | error_device_descriptor: |
da307123 | 1965 | usb_autosuspend_device(usb_dev); |
93993a0a IPG |
1966 | error_autoresume: |
1967 | out_authorized: | |
1968 | usb_unlock_device(usb_dev); // complements locktree | |
1969 | return result; | |
1970 | } | |
1971 | ||
1972 | ||
0165de09 IPG |
1973 | /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ |
1974 | static unsigned hub_is_wusb(struct usb_hub *hub) | |
1975 | { | |
1976 | struct usb_hcd *hcd; | |
1977 | if (hub->hdev->parent != NULL) /* not a root hub? */ | |
1978 | return 0; | |
1979 | hcd = container_of(hub->hdev->bus, struct usb_hcd, self); | |
1980 | return hcd->wireless; | |
1981 | } | |
1982 | ||
1983 | ||
1da177e4 LT |
1984 | #define PORT_RESET_TRIES 5 |
1985 | #define SET_ADDRESS_TRIES 2 | |
1986 | #define GET_DESCRIPTOR_TRIES 2 | |
1987 | #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) | |
1988 | #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) | |
1989 | ||
1990 | #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ | |
1991 | #define HUB_SHORT_RESET_TIME 10 | |
1992 | #define HUB_LONG_RESET_TIME 200 | |
1993 | #define HUB_RESET_TIMEOUT 500 | |
1994 | ||
1995 | static int hub_port_wait_reset(struct usb_hub *hub, int port1, | |
1996 | struct usb_device *udev, unsigned int delay) | |
1997 | { | |
1998 | int delay_time, ret; | |
1999 | u16 portstatus; | |
2000 | u16 portchange; | |
2001 | ||
2002 | for (delay_time = 0; | |
2003 | delay_time < HUB_RESET_TIMEOUT; | |
2004 | delay_time += delay) { | |
2005 | /* wait to give the device a chance to reset */ | |
2006 | msleep(delay); | |
2007 | ||
2008 | /* read and decode port status */ | |
2009 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
2010 | if (ret < 0) | |
2011 | return ret; | |
2012 | ||
2013 | /* Device went away? */ | |
2014 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) | |
2015 | return -ENOTCONN; | |
2016 | ||
dd4dd19e | 2017 | /* bomb out completely if the connection bounced */ |
1da177e4 | 2018 | if ((portchange & USB_PORT_STAT_C_CONNECTION)) |
dd4dd19e | 2019 | return -ENOTCONN; |
1da177e4 LT |
2020 | |
2021 | /* if we`ve finished resetting, then break out of the loop */ | |
2022 | if (!(portstatus & USB_PORT_STAT_RESET) && | |
2023 | (portstatus & USB_PORT_STAT_ENABLE)) { | |
0165de09 | 2024 | if (hub_is_wusb(hub)) |
551cdbbe | 2025 | udev->speed = USB_SPEED_WIRELESS; |
809cd1cb SS |
2026 | else if (portstatus & USB_PORT_STAT_SUPER_SPEED) |
2027 | udev->speed = USB_SPEED_SUPER; | |
0165de09 | 2028 | else if (portstatus & USB_PORT_STAT_HIGH_SPEED) |
1da177e4 LT |
2029 | udev->speed = USB_SPEED_HIGH; |
2030 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) | |
2031 | udev->speed = USB_SPEED_LOW; | |
2032 | else | |
2033 | udev->speed = USB_SPEED_FULL; | |
2034 | return 0; | |
2035 | } | |
2036 | ||
2037 | /* switch to the long delay after two short delay failures */ | |
2038 | if (delay_time >= 2 * HUB_SHORT_RESET_TIME) | |
2039 | delay = HUB_LONG_RESET_TIME; | |
2040 | ||
2041 | dev_dbg (hub->intfdev, | |
2042 | "port %d not reset yet, waiting %dms\n", | |
2043 | port1, delay); | |
2044 | } | |
2045 | ||
2046 | return -EBUSY; | |
2047 | } | |
2048 | ||
2049 | static int hub_port_reset(struct usb_hub *hub, int port1, | |
2050 | struct usb_device *udev, unsigned int delay) | |
2051 | { | |
2052 | int i, status; | |
a5f0efab | 2053 | struct usb_hcd *hcd; |
1da177e4 | 2054 | |
a5f0efab | 2055 | hcd = bus_to_hcd(udev->bus); |
32fe0198 AS |
2056 | /* Block EHCI CF initialization during the port reset. |
2057 | * Some companion controllers don't like it when they mix. | |
2058 | */ | |
2059 | down_read(&ehci_cf_port_reset_rwsem); | |
2060 | ||
1da177e4 LT |
2061 | /* Reset the port */ |
2062 | for (i = 0; i < PORT_RESET_TRIES; i++) { | |
2063 | status = set_port_feature(hub->hdev, | |
2064 | port1, USB_PORT_FEAT_RESET); | |
2065 | if (status) | |
2066 | dev_err(hub->intfdev, | |
2067 | "cannot reset port %d (err = %d)\n", | |
2068 | port1, status); | |
2069 | else { | |
2070 | status = hub_port_wait_reset(hub, port1, udev, delay); | |
dd16525b | 2071 | if (status && status != -ENOTCONN) |
1da177e4 LT |
2072 | dev_dbg(hub->intfdev, |
2073 | "port_wait_reset: err = %d\n", | |
2074 | status); | |
2075 | } | |
2076 | ||
2077 | /* return on disconnect or reset */ | |
2078 | switch (status) { | |
2079 | case 0: | |
b789696a DB |
2080 | /* TRSTRCY = 10 ms; plus some extra */ |
2081 | msleep(10 + 40); | |
3b29b68b | 2082 | update_devnum(udev, 0); |
a5f0efab SS |
2083 | if (hcd->driver->reset_device) { |
2084 | status = hcd->driver->reset_device(hcd, udev); | |
2085 | if (status < 0) { | |
2086 | dev_err(&udev->dev, "Cannot reset " | |
2087 | "HCD device state\n"); | |
2088 | break; | |
2089 | } | |
2090 | } | |
1da177e4 LT |
2091 | /* FALL THROUGH */ |
2092 | case -ENOTCONN: | |
2093 | case -ENODEV: | |
2094 | clear_port_feature(hub->hdev, | |
2095 | port1, USB_PORT_FEAT_C_RESET); | |
2096 | /* FIXME need disconnect() for NOTATTACHED device */ | |
2097 | usb_set_device_state(udev, status | |
2098 | ? USB_STATE_NOTATTACHED | |
2099 | : USB_STATE_DEFAULT); | |
32fe0198 | 2100 | goto done; |
1da177e4 LT |
2101 | } |
2102 | ||
2103 | dev_dbg (hub->intfdev, | |
2104 | "port %d not enabled, trying reset again...\n", | |
2105 | port1); | |
2106 | delay = HUB_LONG_RESET_TIME; | |
2107 | } | |
2108 | ||
2109 | dev_err (hub->intfdev, | |
2110 | "Cannot enable port %i. Maybe the USB cable is bad?\n", | |
2111 | port1); | |
2112 | ||
32fe0198 AS |
2113 | done: |
2114 | up_read(&ehci_cf_port_reset_rwsem); | |
1da177e4 LT |
2115 | return status; |
2116 | } | |
2117 | ||
d388dab7 | 2118 | #ifdef CONFIG_PM |
1da177e4 | 2119 | |
b01b03f3 AS |
2120 | #define MASK_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION | \ |
2121 | USB_PORT_STAT_SUSPEND) | |
2122 | #define WANT_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION) | |
2123 | ||
2124 | /* Determine whether the device on a port is ready for a normal resume, | |
2125 | * is ready for a reset-resume, or should be disconnected. | |
2126 | */ | |
2127 | static int check_port_resume_type(struct usb_device *udev, | |
2128 | struct usb_hub *hub, int port1, | |
2129 | int status, unsigned portchange, unsigned portstatus) | |
2130 | { | |
2131 | /* Is the device still present? */ | |
2132 | if (status || (portstatus & MASK_BITS) != WANT_BITS) { | |
2133 | if (status >= 0) | |
2134 | status = -ENODEV; | |
2135 | } | |
2136 | ||
86c57edf AS |
2137 | /* Can't do a normal resume if the port isn't enabled, |
2138 | * so try a reset-resume instead. | |
2139 | */ | |
2140 | else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { | |
2141 | if (udev->persist_enabled) | |
2142 | udev->reset_resume = 1; | |
2143 | else | |
2144 | status = -ENODEV; | |
2145 | } | |
b01b03f3 AS |
2146 | |
2147 | if (status) { | |
2148 | dev_dbg(hub->intfdev, | |
2149 | "port %d status %04x.%04x after resume, %d\n", | |
2150 | port1, portchange, portstatus, status); | |
2151 | } else if (udev->reset_resume) { | |
2152 | ||
2153 | /* Late port handoff can set status-change bits */ | |
2154 | if (portchange & USB_PORT_STAT_C_CONNECTION) | |
2155 | clear_port_feature(hub->hdev, port1, | |
2156 | USB_PORT_FEAT_C_CONNECTION); | |
2157 | if (portchange & USB_PORT_STAT_C_ENABLE) | |
2158 | clear_port_feature(hub->hdev, port1, | |
2159 | USB_PORT_FEAT_C_ENABLE); | |
2160 | } | |
2161 | ||
2162 | return status; | |
2163 | } | |
2164 | ||
1da177e4 LT |
2165 | #ifdef CONFIG_USB_SUSPEND |
2166 | ||
2167 | /* | |
624d6c07 AS |
2168 | * usb_port_suspend - suspend a usb device's upstream port |
2169 | * @udev: device that's no longer in active use, not a root hub | |
2170 | * Context: must be able to sleep; device not locked; pm locks held | |
2171 | * | |
2172 | * Suspends a USB device that isn't in active use, conserving power. | |
2173 | * Devices may wake out of a suspend, if anything important happens, | |
2174 | * using the remote wakeup mechanism. They may also be taken out of | |
2175 | * suspend by the host, using usb_port_resume(). It's also routine | |
2176 | * to disconnect devices while they are suspended. | |
2177 | * | |
2178 | * This only affects the USB hardware for a device; its interfaces | |
2179 | * (and, for hubs, child devices) must already have been suspended. | |
2180 | * | |
1da177e4 LT |
2181 | * Selective port suspend reduces power; most suspended devices draw |
2182 | * less than 500 uA. It's also used in OTG, along with remote wakeup. | |
2183 | * All devices below the suspended port are also suspended. | |
2184 | * | |
2185 | * Devices leave suspend state when the host wakes them up. Some devices | |
2186 | * also support "remote wakeup", where the device can activate the USB | |
2187 | * tree above them to deliver data, such as a keypress or packet. In | |
2188 | * some cases, this wakes the USB host. | |
624d6c07 AS |
2189 | * |
2190 | * Suspending OTG devices may trigger HNP, if that's been enabled | |
2191 | * between a pair of dual-role devices. That will change roles, such | |
2192 | * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. | |
2193 | * | |
2194 | * Devices on USB hub ports have only one "suspend" state, corresponding | |
2195 | * to ACPI D2, "may cause the device to lose some context". | |
2196 | * State transitions include: | |
2197 | * | |
2198 | * - suspend, resume ... when the VBUS power link stays live | |
2199 | * - suspend, disconnect ... VBUS lost | |
2200 | * | |
2201 | * Once VBUS drop breaks the circuit, the port it's using has to go through | |
2202 | * normal re-enumeration procedures, starting with enabling VBUS power. | |
2203 | * Other than re-initializing the hub (plug/unplug, except for root hubs), | |
2204 | * Linux (2.6) currently has NO mechanisms to initiate that: no khubd | |
2205 | * timer, no SRP, no requests through sysfs. | |
2206 | * | |
2207 | * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when | |
2208 | * the root hub for their bus goes into global suspend ... so we don't | |
2209 | * (falsely) update the device power state to say it suspended. | |
2210 | * | |
2211 | * Returns 0 on success, else negative errno. | |
1da177e4 | 2212 | */ |
65bfd296 | 2213 | int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 2214 | { |
624d6c07 AS |
2215 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
2216 | int port1 = udev->portnum; | |
2217 | int status; | |
1da177e4 LT |
2218 | |
2219 | // dev_dbg(hub->intfdev, "suspend port %d\n", port1); | |
2220 | ||
2221 | /* enable remote wakeup when appropriate; this lets the device | |
2222 | * wake up the upstream hub (including maybe the root hub). | |
2223 | * | |
2224 | * NOTE: OTG devices may issue remote wakeup (or SRP) even when | |
2225 | * we don't explicitly enable it here. | |
2226 | */ | |
645daaab | 2227 | if (udev->do_remote_wakeup) { |
1da177e4 LT |
2228 | status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
2229 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
2230 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
2231 | NULL, 0, | |
2232 | USB_CTRL_SET_TIMEOUT); | |
0c487206 | 2233 | if (status) { |
624d6c07 AS |
2234 | dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", |
2235 | status); | |
0c487206 ON |
2236 | /* bail if autosuspend is requested */ |
2237 | if (msg.event & PM_EVENT_AUTO) | |
2238 | return status; | |
2239 | } | |
1da177e4 LT |
2240 | } |
2241 | ||
2242 | /* see 7.1.7.6 */ | |
2243 | status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); | |
2244 | if (status) { | |
624d6c07 AS |
2245 | dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", |
2246 | port1, status); | |
1da177e4 | 2247 | /* paranoia: "should not happen" */ |
0c487206 ON |
2248 | if (udev->do_remote_wakeup) |
2249 | (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
1da177e4 LT |
2250 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, |
2251 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
2252 | NULL, 0, | |
2253 | USB_CTRL_SET_TIMEOUT); | |
2254 | } else { | |
2255 | /* device has up to 10 msec to fully suspend */ | |
645daaab | 2256 | dev_dbg(&udev->dev, "usb %ssuspend\n", |
65bfd296 | 2257 | (msg.event & PM_EVENT_AUTO ? "auto-" : "")); |
1da177e4 LT |
2258 | usb_set_device_state(udev, USB_STATE_SUSPENDED); |
2259 | msleep(10); | |
2260 | } | |
c08512c7 | 2261 | usb_mark_last_busy(hub->hdev); |
1da177e4 LT |
2262 | return status; |
2263 | } | |
2264 | ||
1da177e4 | 2265 | /* |
390a8c34 DB |
2266 | * If the USB "suspend" state is in use (rather than "global suspend"), |
2267 | * many devices will be individually taken out of suspend state using | |
54515fe5 | 2268 | * special "resume" signaling. This routine kicks in shortly after |
1da177e4 LT |
2269 | * hardware resume signaling is finished, either because of selective |
2270 | * resume (by host) or remote wakeup (by device) ... now see what changed | |
2271 | * in the tree that's rooted at this device. | |
54515fe5 AS |
2272 | * |
2273 | * If @udev->reset_resume is set then the device is reset before the | |
2274 | * status check is done. | |
1da177e4 | 2275 | */ |
140d8f68 | 2276 | static int finish_port_resume(struct usb_device *udev) |
1da177e4 | 2277 | { |
54515fe5 | 2278 | int status = 0; |
1da177e4 LT |
2279 | u16 devstatus; |
2280 | ||
2281 | /* caller owns the udev device lock */ | |
b9cef6c3 WF |
2282 | dev_dbg(&udev->dev, "%s\n", |
2283 | udev->reset_resume ? "finish reset-resume" : "finish resume"); | |
1da177e4 LT |
2284 | |
2285 | /* usb ch9 identifies four variants of SUSPENDED, based on what | |
2286 | * state the device resumes to. Linux currently won't see the | |
2287 | * first two on the host side; they'd be inside hub_port_init() | |
2288 | * during many timeouts, but khubd can't suspend until later. | |
2289 | */ | |
2290 | usb_set_device_state(udev, udev->actconfig | |
2291 | ? USB_STATE_CONFIGURED | |
2292 | : USB_STATE_ADDRESS); | |
1da177e4 | 2293 | |
54515fe5 AS |
2294 | /* 10.5.4.5 says not to reset a suspended port if the attached |
2295 | * device is enabled for remote wakeup. Hence the reset | |
2296 | * operation is carried out here, after the port has been | |
2297 | * resumed. | |
2298 | */ | |
2299 | if (udev->reset_resume) | |
86c57edf | 2300 | retry_reset_resume: |
742120c6 | 2301 | status = usb_reset_and_verify_device(udev); |
54515fe5 | 2302 | |
1da177e4 LT |
2303 | /* 10.5.4.5 says be sure devices in the tree are still there. |
2304 | * For now let's assume the device didn't go crazy on resume, | |
2305 | * and device drivers will know about any resume quirks. | |
2306 | */ | |
54515fe5 | 2307 | if (status == 0) { |
46dede46 | 2308 | devstatus = 0; |
54515fe5 AS |
2309 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); |
2310 | if (status >= 0) | |
46dede46 | 2311 | status = (status > 0 ? 0 : -ENODEV); |
86c57edf AS |
2312 | |
2313 | /* If a normal resume failed, try doing a reset-resume */ | |
2314 | if (status && !udev->reset_resume && udev->persist_enabled) { | |
2315 | dev_dbg(&udev->dev, "retry with reset-resume\n"); | |
2316 | udev->reset_resume = 1; | |
2317 | goto retry_reset_resume; | |
2318 | } | |
54515fe5 | 2319 | } |
b40b7a90 | 2320 | |
624d6c07 AS |
2321 | if (status) { |
2322 | dev_dbg(&udev->dev, "gone after usb resume? status %d\n", | |
2323 | status); | |
2324 | } else if (udev->actconfig) { | |
1da177e4 | 2325 | le16_to_cpus(&devstatus); |
686314cf | 2326 | if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) { |
1da177e4 LT |
2327 | status = usb_control_msg(udev, |
2328 | usb_sndctrlpipe(udev, 0), | |
2329 | USB_REQ_CLEAR_FEATURE, | |
2330 | USB_RECIP_DEVICE, | |
2331 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
2332 | NULL, 0, | |
2333 | USB_CTRL_SET_TIMEOUT); | |
a8e7c565 | 2334 | if (status) |
b9cef6c3 WF |
2335 | dev_dbg(&udev->dev, |
2336 | "disable remote wakeup, status %d\n", | |
2337 | status); | |
4bf0ba86 | 2338 | } |
1da177e4 | 2339 | status = 0; |
1da177e4 LT |
2340 | } |
2341 | return status; | |
2342 | } | |
2343 | ||
624d6c07 AS |
2344 | /* |
2345 | * usb_port_resume - re-activate a suspended usb device's upstream port | |
2346 | * @udev: device to re-activate, not a root hub | |
2347 | * Context: must be able to sleep; device not locked; pm locks held | |
2348 | * | |
2349 | * This will re-activate the suspended device, increasing power usage | |
2350 | * while letting drivers communicate again with its endpoints. | |
2351 | * USB resume explicitly guarantees that the power session between | |
2352 | * the host and the device is the same as it was when the device | |
2353 | * suspended. | |
2354 | * | |
feccc30d AS |
2355 | * If @udev->reset_resume is set then this routine won't check that the |
2356 | * port is still enabled. Furthermore, finish_port_resume() above will | |
54515fe5 AS |
2357 | * reset @udev. The end result is that a broken power session can be |
2358 | * recovered and @udev will appear to persist across a loss of VBUS power. | |
2359 | * | |
2360 | * For example, if a host controller doesn't maintain VBUS suspend current | |
2361 | * during a system sleep or is reset when the system wakes up, all the USB | |
2362 | * power sessions below it will be broken. This is especially troublesome | |
2363 | * for mass-storage devices containing mounted filesystems, since the | |
2364 | * device will appear to have disconnected and all the memory mappings | |
2365 | * to it will be lost. Using the USB_PERSIST facility, the device can be | |
2366 | * made to appear as if it had not disconnected. | |
2367 | * | |
742120c6 | 2368 | * This facility can be dangerous. Although usb_reset_and_verify_device() makes |
feccc30d | 2369 | * every effort to insure that the same device is present after the |
54515fe5 AS |
2370 | * reset as before, it cannot provide a 100% guarantee. Furthermore it's |
2371 | * quite possible for a device to remain unaltered but its media to be | |
2372 | * changed. If the user replaces a flash memory card while the system is | |
2373 | * asleep, he will have only himself to blame when the filesystem on the | |
2374 | * new card is corrupted and the system crashes. | |
2375 | * | |
624d6c07 AS |
2376 | * Returns 0 on success, else negative errno. |
2377 | */ | |
65bfd296 | 2378 | int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 2379 | { |
624d6c07 AS |
2380 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
2381 | int port1 = udev->portnum; | |
2382 | int status; | |
2383 | u16 portchange, portstatus; | |
d25450c6 AS |
2384 | |
2385 | /* Skip the initial Clear-Suspend step for a remote wakeup */ | |
2386 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
2387 | if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND)) | |
2388 | goto SuspendCleared; | |
1da177e4 LT |
2389 | |
2390 | // dev_dbg(hub->intfdev, "resume port %d\n", port1); | |
2391 | ||
d5cbad4b AS |
2392 | set_bit(port1, hub->busy_bits); |
2393 | ||
1da177e4 LT |
2394 | /* see 7.1.7.7; affects power usage, but not budgeting */ |
2395 | status = clear_port_feature(hub->hdev, | |
2396 | port1, USB_PORT_FEAT_SUSPEND); | |
2397 | if (status) { | |
624d6c07 AS |
2398 | dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", |
2399 | port1, status); | |
1da177e4 | 2400 | } else { |
1da177e4 | 2401 | /* drive resume for at least 20 msec */ |
686314cf | 2402 | dev_dbg(&udev->dev, "usb %sresume\n", |
65bfd296 | 2403 | (msg.event & PM_EVENT_AUTO ? "auto-" : "")); |
1da177e4 LT |
2404 | msleep(25); |
2405 | ||
1da177e4 LT |
2406 | /* Virtual root hubs can trigger on GET_PORT_STATUS to |
2407 | * stop resume signaling. Then finish the resume | |
2408 | * sequence. | |
2409 | */ | |
d25450c6 | 2410 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
54515fe5 | 2411 | |
b01b03f3 AS |
2412 | /* TRSMRCY = 10 msec */ |
2413 | msleep(10); | |
2414 | } | |
2415 | ||
54515fe5 | 2416 | SuspendCleared: |
b01b03f3 AS |
2417 | if (status == 0) { |
2418 | if (portchange & USB_PORT_STAT_C_SUSPEND) | |
2419 | clear_port_feature(hub->hdev, port1, | |
2420 | USB_PORT_FEAT_C_SUSPEND); | |
1da177e4 | 2421 | } |
1da177e4 | 2422 | |
d5cbad4b | 2423 | clear_bit(port1, hub->busy_bits); |
d5cbad4b | 2424 | |
b01b03f3 AS |
2425 | status = check_port_resume_type(udev, |
2426 | hub, port1, status, portchange, portstatus); | |
54515fe5 AS |
2427 | if (status == 0) |
2428 | status = finish_port_resume(udev); | |
2429 | if (status < 0) { | |
2430 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); | |
2431 | hub_port_logical_disconnect(hub, port1); | |
2432 | } | |
1da177e4 LT |
2433 | return status; |
2434 | } | |
2435 | ||
8808f00c | 2436 | /* caller has locked udev */ |
0534d468 | 2437 | int usb_remote_wakeup(struct usb_device *udev) |
1da177e4 LT |
2438 | { |
2439 | int status = 0; | |
2440 | ||
1da177e4 | 2441 | if (udev->state == USB_STATE_SUSPENDED) { |
645daaab | 2442 | dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); |
9bbdf1e0 AS |
2443 | status = usb_autoresume_device(udev); |
2444 | if (status == 0) { | |
2445 | /* Let the drivers do their thing, then... */ | |
2446 | usb_autosuspend_device(udev); | |
2447 | } | |
1da177e4 | 2448 | } |
1da177e4 LT |
2449 | return status; |
2450 | } | |
2451 | ||
d388dab7 AS |
2452 | #else /* CONFIG_USB_SUSPEND */ |
2453 | ||
2454 | /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ | |
2455 | ||
65bfd296 | 2456 | int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
d388dab7 AS |
2457 | { |
2458 | return 0; | |
2459 | } | |
2460 | ||
b01b03f3 AS |
2461 | /* However we may need to do a reset-resume */ |
2462 | ||
65bfd296 | 2463 | int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
d388dab7 | 2464 | { |
b01b03f3 AS |
2465 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
2466 | int port1 = udev->portnum; | |
2467 | int status; | |
2468 | u16 portchange, portstatus; | |
2469 | ||
2470 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
2471 | status = check_port_resume_type(udev, | |
2472 | hub, port1, status, portchange, portstatus); | |
54515fe5 | 2473 | |
b01b03f3 AS |
2474 | if (status) { |
2475 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); | |
2476 | hub_port_logical_disconnect(hub, port1); | |
2477 | } else if (udev->reset_resume) { | |
54515fe5 | 2478 | dev_dbg(&udev->dev, "reset-resume\n"); |
742120c6 | 2479 | status = usb_reset_and_verify_device(udev); |
54515fe5 AS |
2480 | } |
2481 | return status; | |
d388dab7 AS |
2482 | } |
2483 | ||
d388dab7 AS |
2484 | #endif |
2485 | ||
db690874 | 2486 | static int hub_suspend(struct usb_interface *intf, pm_message_t msg) |
1da177e4 LT |
2487 | { |
2488 | struct usb_hub *hub = usb_get_intfdata (intf); | |
2489 | struct usb_device *hdev = hub->hdev; | |
2490 | unsigned port1; | |
1da177e4 | 2491 | |
c9f89fa4 | 2492 | /* fail if children aren't already suspended */ |
1da177e4 LT |
2493 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
2494 | struct usb_device *udev; | |
2495 | ||
2496 | udev = hdev->children [port1-1]; | |
6840d255 | 2497 | if (udev && udev->can_submit) { |
65bfd296 | 2498 | if (!(msg.event & PM_EVENT_AUTO)) |
645daaab AS |
2499 | dev_dbg(&intf->dev, "port %d nyet suspended\n", |
2500 | port1); | |
c9f89fa4 DB |
2501 | return -EBUSY; |
2502 | } | |
1da177e4 LT |
2503 | } |
2504 | ||
441b62c1 | 2505 | dev_dbg(&intf->dev, "%s\n", __func__); |
40f122f3 | 2506 | |
12f1ff83 | 2507 | /* stop khubd and related activity */ |
4330354f | 2508 | hub_quiesce(hub, HUB_SUSPEND); |
b6f6436d | 2509 | return 0; |
1da177e4 LT |
2510 | } |
2511 | ||
2512 | static int hub_resume(struct usb_interface *intf) | |
2513 | { | |
5e6effae | 2514 | struct usb_hub *hub = usb_get_intfdata(intf); |
40f122f3 | 2515 | |
5e6effae | 2516 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 2517 | hub_activate(hub, HUB_RESUME); |
1da177e4 LT |
2518 | return 0; |
2519 | } | |
2520 | ||
b41a60ec | 2521 | static int hub_reset_resume(struct usb_interface *intf) |
f07600cf | 2522 | { |
b41a60ec | 2523 | struct usb_hub *hub = usb_get_intfdata(intf); |
f07600cf | 2524 | |
5e6effae | 2525 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 2526 | hub_activate(hub, HUB_RESET_RESUME); |
f07600cf AS |
2527 | return 0; |
2528 | } | |
2529 | ||
54515fe5 AS |
2530 | /** |
2531 | * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power | |
2532 | * @rhdev: struct usb_device for the root hub | |
2533 | * | |
2534 | * The USB host controller driver calls this function when its root hub | |
2535 | * is resumed and Vbus power has been interrupted or the controller | |
feccc30d AS |
2536 | * has been reset. The routine marks @rhdev as having lost power. |
2537 | * When the hub driver is resumed it will take notice and carry out | |
2538 | * power-session recovery for all the "USB-PERSIST"-enabled child devices; | |
2539 | * the others will be disconnected. | |
54515fe5 AS |
2540 | */ |
2541 | void usb_root_hub_lost_power(struct usb_device *rhdev) | |
2542 | { | |
2543 | dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); | |
2544 | rhdev->reset_resume = 1; | |
2545 | } | |
2546 | EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); | |
2547 | ||
d388dab7 AS |
2548 | #else /* CONFIG_PM */ |
2549 | ||
f07600cf AS |
2550 | #define hub_suspend NULL |
2551 | #define hub_resume NULL | |
2552 | #define hub_reset_resume NULL | |
d388dab7 AS |
2553 | #endif |
2554 | ||
1da177e4 LT |
2555 | |
2556 | /* USB 2.0 spec, 7.1.7.3 / fig 7-29: | |
2557 | * | |
2558 | * Between connect detection and reset signaling there must be a delay | |
2559 | * of 100ms at least for debounce and power-settling. The corresponding | |
2560 | * timer shall restart whenever the downstream port detects a disconnect. | |
2561 | * | |
2562 | * Apparently there are some bluetooth and irda-dongles and a number of | |
2563 | * low-speed devices for which this debounce period may last over a second. | |
2564 | * Not covered by the spec - but easy to deal with. | |
2565 | * | |
2566 | * This implementation uses a 1500ms total debounce timeout; if the | |
2567 | * connection isn't stable by then it returns -ETIMEDOUT. It checks | |
2568 | * every 25ms for transient disconnects. When the port status has been | |
2569 | * unchanged for 100ms it returns the port status. | |
2570 | */ | |
1da177e4 LT |
2571 | static int hub_port_debounce(struct usb_hub *hub, int port1) |
2572 | { | |
2573 | int ret; | |
2574 | int total_time, stable_time = 0; | |
2575 | u16 portchange, portstatus; | |
2576 | unsigned connection = 0xffff; | |
2577 | ||
2578 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { | |
2579 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
2580 | if (ret < 0) | |
2581 | return ret; | |
2582 | ||
2583 | if (!(portchange & USB_PORT_STAT_C_CONNECTION) && | |
2584 | (portstatus & USB_PORT_STAT_CONNECTION) == connection) { | |
2585 | stable_time += HUB_DEBOUNCE_STEP; | |
2586 | if (stable_time >= HUB_DEBOUNCE_STABLE) | |
2587 | break; | |
2588 | } else { | |
2589 | stable_time = 0; | |
2590 | connection = portstatus & USB_PORT_STAT_CONNECTION; | |
2591 | } | |
2592 | ||
2593 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
2594 | clear_port_feature(hub->hdev, port1, | |
2595 | USB_PORT_FEAT_C_CONNECTION); | |
2596 | } | |
2597 | ||
2598 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
2599 | break; | |
2600 | msleep(HUB_DEBOUNCE_STEP); | |
2601 | } | |
2602 | ||
2603 | dev_dbg (hub->intfdev, | |
2604 | "debounce: port %d: total %dms stable %dms status 0x%x\n", | |
2605 | port1, total_time, stable_time, portstatus); | |
2606 | ||
2607 | if (stable_time < HUB_DEBOUNCE_STABLE) | |
2608 | return -ETIMEDOUT; | |
2609 | return portstatus; | |
2610 | } | |
2611 | ||
fc721f51 | 2612 | void usb_ep0_reinit(struct usb_device *udev) |
1da177e4 | 2613 | { |
ddeac4e7 AS |
2614 | usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); |
2615 | usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); | |
2caf7fcd | 2616 | usb_enable_endpoint(udev, &udev->ep0, true); |
1da177e4 | 2617 | } |
fc721f51 | 2618 | EXPORT_SYMBOL_GPL(usb_ep0_reinit); |
1da177e4 LT |
2619 | |
2620 | #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) | |
2621 | #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) | |
2622 | ||
4326ed0b | 2623 | static int hub_set_address(struct usb_device *udev, int devnum) |
1da177e4 LT |
2624 | { |
2625 | int retval; | |
c6515272 | 2626 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 2627 | |
c6515272 SS |
2628 | /* |
2629 | * The host controller will choose the device address, | |
2630 | * instead of the core having chosen it earlier | |
2631 | */ | |
2632 | if (!hcd->driver->address_device && devnum <= 1) | |
1da177e4 LT |
2633 | return -EINVAL; |
2634 | if (udev->state == USB_STATE_ADDRESS) | |
2635 | return 0; | |
2636 | if (udev->state != USB_STATE_DEFAULT) | |
2637 | return -EINVAL; | |
c8d4af8e | 2638 | if (hcd->driver->address_device) |
c6515272 | 2639 | retval = hcd->driver->address_device(hcd, udev); |
c8d4af8e | 2640 | else |
c6515272 SS |
2641 | retval = usb_control_msg(udev, usb_sndaddr0pipe(), |
2642 | USB_REQ_SET_ADDRESS, 0, devnum, 0, | |
2643 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
1da177e4 | 2644 | if (retval == 0) { |
3b29b68b | 2645 | update_devnum(udev, devnum); |
4953d141 | 2646 | /* Device now using proper address. */ |
1da177e4 | 2647 | usb_set_device_state(udev, USB_STATE_ADDRESS); |
fc721f51 | 2648 | usb_ep0_reinit(udev); |
1da177e4 LT |
2649 | } |
2650 | return retval; | |
2651 | } | |
2652 | ||
2653 | /* Reset device, (re)assign address, get device descriptor. | |
2654 | * Device connection must be stable, no more debouncing needed. | |
2655 | * Returns device in USB_STATE_ADDRESS, except on error. | |
2656 | * | |
2657 | * If this is called for an already-existing device (as part of | |
742120c6 | 2658 | * usb_reset_and_verify_device), the caller must own the device lock. For a |
1da177e4 LT |
2659 | * newly detected device that is not accessible through any global |
2660 | * pointers, it's not necessary to lock the device. | |
2661 | */ | |
2662 | static int | |
2663 | hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, | |
2664 | int retry_counter) | |
2665 | { | |
4186ecf8 | 2666 | static DEFINE_MUTEX(usb_address0_mutex); |
1da177e4 LT |
2667 | |
2668 | struct usb_device *hdev = hub->hdev; | |
e7b77172 | 2669 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
1da177e4 LT |
2670 | int i, j, retval; |
2671 | unsigned delay = HUB_SHORT_RESET_TIME; | |
2672 | enum usb_device_speed oldspeed = udev->speed; | |
83a07196 | 2673 | char *speed, *type; |
4326ed0b | 2674 | int devnum = udev->devnum; |
1da177e4 LT |
2675 | |
2676 | /* root hub ports have a slightly longer reset period | |
2677 | * (from USB 2.0 spec, section 7.1.7.5) | |
2678 | */ | |
2679 | if (!hdev->parent) { | |
2680 | delay = HUB_ROOT_RESET_TIME; | |
2681 | if (port1 == hdev->bus->otg_port) | |
2682 | hdev->bus->b_hnp_enable = 0; | |
2683 | } | |
2684 | ||
2685 | /* Some low speed devices have problems with the quick delay, so */ | |
2686 | /* be a bit pessimistic with those devices. RHbug #23670 */ | |
2687 | if (oldspeed == USB_SPEED_LOW) | |
2688 | delay = HUB_LONG_RESET_TIME; | |
2689 | ||
4186ecf8 | 2690 | mutex_lock(&usb_address0_mutex); |
1da177e4 | 2691 | |
a5f0efab | 2692 | if (!udev->config && oldspeed == USB_SPEED_SUPER) { |
e7b77172 SS |
2693 | /* Don't reset USB 3.0 devices during an initial setup */ |
2694 | usb_set_device_state(udev, USB_STATE_DEFAULT); | |
2695 | } else { | |
2696 | /* Reset the device; full speed may morph to high speed */ | |
2697 | /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ | |
2698 | retval = hub_port_reset(hub, port1, udev, delay); | |
2699 | if (retval < 0) /* error or disconnect */ | |
2700 | goto fail; | |
2701 | /* success, speed is known */ | |
2702 | } | |
1da177e4 LT |
2703 | retval = -ENODEV; |
2704 | ||
2705 | if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { | |
2706 | dev_dbg(&udev->dev, "device reset changed speed!\n"); | |
2707 | goto fail; | |
2708 | } | |
2709 | oldspeed = udev->speed; | |
4326ed0b | 2710 | |
1da177e4 LT |
2711 | /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... |
2712 | * it's fixed size except for full speed devices. | |
5bb6e0ae IPG |
2713 | * For Wireless USB devices, ep0 max packet is always 512 (tho |
2714 | * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. | |
1da177e4 LT |
2715 | */ |
2716 | switch (udev->speed) { | |
6b403b02 | 2717 | case USB_SPEED_SUPER: |
551cdbbe | 2718 | case USB_SPEED_WIRELESS: /* fixed at 512 */ |
551509d2 | 2719 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); |
5bb6e0ae | 2720 | break; |
1da177e4 | 2721 | case USB_SPEED_HIGH: /* fixed at 64 */ |
551509d2 | 2722 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
2723 | break; |
2724 | case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ | |
2725 | /* to determine the ep0 maxpacket size, try to read | |
2726 | * the device descriptor to get bMaxPacketSize0 and | |
2727 | * then correct our initial guess. | |
2728 | */ | |
551509d2 | 2729 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
2730 | break; |
2731 | case USB_SPEED_LOW: /* fixed at 8 */ | |
551509d2 | 2732 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); |
1da177e4 LT |
2733 | break; |
2734 | default: | |
2735 | goto fail; | |
2736 | } | |
2737 | ||
83a07196 IPG |
2738 | type = ""; |
2739 | switch (udev->speed) { | |
2740 | case USB_SPEED_LOW: speed = "low"; break; | |
2741 | case USB_SPEED_FULL: speed = "full"; break; | |
2742 | case USB_SPEED_HIGH: speed = "high"; break; | |
6b403b02 SS |
2743 | case USB_SPEED_SUPER: |
2744 | speed = "super"; | |
2745 | break; | |
551cdbbe | 2746 | case USB_SPEED_WIRELESS: |
83a07196 IPG |
2747 | speed = "variable"; |
2748 | type = "Wireless "; | |
2749 | break; | |
2750 | default: speed = "?"; break; | |
2751 | } | |
c6515272 SS |
2752 | if (udev->speed != USB_SPEED_SUPER) |
2753 | dev_info(&udev->dev, | |
3b29b68b | 2754 | "%s %s speed %sUSB device number %d using %s\n", |
c6515272 | 2755 | (udev->config) ? "reset" : "new", speed, type, |
3b29b68b | 2756 | devnum, udev->bus->controller->driver->name); |
1da177e4 LT |
2757 | |
2758 | /* Set up TT records, if needed */ | |
2759 | if (hdev->tt) { | |
2760 | udev->tt = hdev->tt; | |
2761 | udev->ttport = hdev->ttport; | |
2762 | } else if (udev->speed != USB_SPEED_HIGH | |
2763 | && hdev->speed == USB_SPEED_HIGH) { | |
d199c96d AS |
2764 | if (!hub->tt.hub) { |
2765 | dev_err(&udev->dev, "parent hub has no TT\n"); | |
2766 | retval = -EINVAL; | |
2767 | goto fail; | |
2768 | } | |
1da177e4 LT |
2769 | udev->tt = &hub->tt; |
2770 | udev->ttport = port1; | |
2771 | } | |
2772 | ||
2773 | /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? | |
2774 | * Because device hardware and firmware is sometimes buggy in | |
2775 | * this area, and this is how Linux has done it for ages. | |
2776 | * Change it cautiously. | |
2777 | * | |
2778 | * NOTE: If USE_NEW_SCHEME() is true we will start by issuing | |
2779 | * a 64-byte GET_DESCRIPTOR request. This is what Windows does, | |
2780 | * so it may help with some non-standards-compliant devices. | |
2781 | * Otherwise we start with SET_ADDRESS and then try to read the | |
2782 | * first 8 bytes of the device descriptor to get the ep0 maxpacket | |
2783 | * value. | |
2784 | */ | |
2785 | for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { | |
c6515272 | 2786 | if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) { |
1da177e4 LT |
2787 | struct usb_device_descriptor *buf; |
2788 | int r = 0; | |
2789 | ||
2790 | #define GET_DESCRIPTOR_BUFSIZE 64 | |
2791 | buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); | |
2792 | if (!buf) { | |
2793 | retval = -ENOMEM; | |
2794 | continue; | |
2795 | } | |
2796 | ||
b89ee19a AS |
2797 | /* Retry on all errors; some devices are flakey. |
2798 | * 255 is for WUSB devices, we actually need to use | |
2799 | * 512 (WUSB1.0[4.8.1]). | |
1da177e4 LT |
2800 | */ |
2801 | for (j = 0; j < 3; ++j) { | |
2802 | buf->bMaxPacketSize0 = 0; | |
2803 | r = usb_control_msg(udev, usb_rcvaddr0pipe(), | |
2804 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, | |
2805 | USB_DT_DEVICE << 8, 0, | |
2806 | buf, GET_DESCRIPTOR_BUFSIZE, | |
fd7c519d | 2807 | initial_descriptor_timeout); |
1da177e4 | 2808 | switch (buf->bMaxPacketSize0) { |
5bb6e0ae | 2809 | case 8: case 16: case 32: case 64: case 255: |
1da177e4 LT |
2810 | if (buf->bDescriptorType == |
2811 | USB_DT_DEVICE) { | |
2812 | r = 0; | |
2813 | break; | |
2814 | } | |
2815 | /* FALL THROUGH */ | |
2816 | default: | |
2817 | if (r == 0) | |
2818 | r = -EPROTO; | |
2819 | break; | |
2820 | } | |
2821 | if (r == 0) | |
2822 | break; | |
2823 | } | |
2824 | udev->descriptor.bMaxPacketSize0 = | |
2825 | buf->bMaxPacketSize0; | |
2826 | kfree(buf); | |
2827 | ||
2828 | retval = hub_port_reset(hub, port1, udev, delay); | |
2829 | if (retval < 0) /* error or disconnect */ | |
2830 | goto fail; | |
2831 | if (oldspeed != udev->speed) { | |
2832 | dev_dbg(&udev->dev, | |
2833 | "device reset changed speed!\n"); | |
2834 | retval = -ENODEV; | |
2835 | goto fail; | |
2836 | } | |
2837 | if (r) { | |
b9cef6c3 WF |
2838 | dev_err(&udev->dev, |
2839 | "device descriptor read/64, error %d\n", | |
2840 | r); | |
1da177e4 LT |
2841 | retval = -EMSGSIZE; |
2842 | continue; | |
2843 | } | |
2844 | #undef GET_DESCRIPTOR_BUFSIZE | |
2845 | } | |
2846 | ||
6c529cdc IPG |
2847 | /* |
2848 | * If device is WUSB, we already assigned an | |
2849 | * unauthorized address in the Connect Ack sequence; | |
2850 | * authorization will assign the final address. | |
2851 | */ | |
c6515272 | 2852 | if (udev->wusb == 0) { |
6c529cdc IPG |
2853 | for (j = 0; j < SET_ADDRESS_TRIES; ++j) { |
2854 | retval = hub_set_address(udev, devnum); | |
2855 | if (retval >= 0) | |
2856 | break; | |
2857 | msleep(200); | |
2858 | } | |
2859 | if (retval < 0) { | |
2860 | dev_err(&udev->dev, | |
2861 | "device not accepting address %d, error %d\n", | |
2862 | devnum, retval); | |
2863 | goto fail; | |
2864 | } | |
c6515272 SS |
2865 | if (udev->speed == USB_SPEED_SUPER) { |
2866 | devnum = udev->devnum; | |
2867 | dev_info(&udev->dev, | |
3b29b68b | 2868 | "%s SuperSpeed USB device number %d using %s\n", |
c6515272 | 2869 | (udev->config) ? "reset" : "new", |
3b29b68b | 2870 | devnum, udev->bus->controller->driver->name); |
c6515272 | 2871 | } |
6c529cdc IPG |
2872 | |
2873 | /* cope with hardware quirkiness: | |
2874 | * - let SET_ADDRESS settle, some device hardware wants it | |
2875 | * - read ep0 maxpacket even for high and low speed, | |
2876 | */ | |
2877 | msleep(10); | |
c6515272 | 2878 | if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) |
1da177e4 | 2879 | break; |
6c529cdc | 2880 | } |
1da177e4 LT |
2881 | |
2882 | retval = usb_get_device_descriptor(udev, 8); | |
2883 | if (retval < 8) { | |
b9cef6c3 WF |
2884 | dev_err(&udev->dev, |
2885 | "device descriptor read/8, error %d\n", | |
2886 | retval); | |
1da177e4 LT |
2887 | if (retval >= 0) |
2888 | retval = -EMSGSIZE; | |
2889 | } else { | |
2890 | retval = 0; | |
2891 | break; | |
2892 | } | |
2893 | } | |
2894 | if (retval) | |
2895 | goto fail; | |
2896 | ||
6b403b02 SS |
2897 | if (udev->descriptor.bMaxPacketSize0 == 0xff || |
2898 | udev->speed == USB_SPEED_SUPER) | |
2899 | i = 512; | |
2900 | else | |
2901 | i = udev->descriptor.bMaxPacketSize0; | |
1da177e4 | 2902 | if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { |
56626a72 | 2903 | if (udev->speed == USB_SPEED_LOW || |
1da177e4 | 2904 | !(i == 8 || i == 16 || i == 32 || i == 64)) { |
56626a72 | 2905 | dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); |
1da177e4 LT |
2906 | retval = -EMSGSIZE; |
2907 | goto fail; | |
2908 | } | |
56626a72 AS |
2909 | if (udev->speed == USB_SPEED_FULL) |
2910 | dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); | |
2911 | else | |
2912 | dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); | |
1da177e4 | 2913 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); |
fc721f51 | 2914 | usb_ep0_reinit(udev); |
1da177e4 LT |
2915 | } |
2916 | ||
2917 | retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); | |
2918 | if (retval < (signed)sizeof(udev->descriptor)) { | |
b9cef6c3 WF |
2919 | dev_err(&udev->dev, "device descriptor read/all, error %d\n", |
2920 | retval); | |
1da177e4 LT |
2921 | if (retval >= 0) |
2922 | retval = -ENOMSG; | |
2923 | goto fail; | |
2924 | } | |
2925 | ||
2926 | retval = 0; | |
48f24970 AD |
2927 | /* notify HCD that we have a device connected and addressed */ |
2928 | if (hcd->driver->update_device) | |
2929 | hcd->driver->update_device(hcd, udev); | |
1da177e4 | 2930 | fail: |
4326ed0b | 2931 | if (retval) { |
1da177e4 | 2932 | hub_port_disable(hub, port1, 0); |
3b29b68b | 2933 | update_devnum(udev, devnum); /* for disconnect processing */ |
4326ed0b | 2934 | } |
4186ecf8 | 2935 | mutex_unlock(&usb_address0_mutex); |
1da177e4 LT |
2936 | return retval; |
2937 | } | |
2938 | ||
2939 | static void | |
2940 | check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) | |
2941 | { | |
2942 | struct usb_qualifier_descriptor *qual; | |
2943 | int status; | |
2944 | ||
e94b1766 | 2945 | qual = kmalloc (sizeof *qual, GFP_KERNEL); |
1da177e4 LT |
2946 | if (qual == NULL) |
2947 | return; | |
2948 | ||
2949 | status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, | |
2950 | qual, sizeof *qual); | |
2951 | if (status == sizeof *qual) { | |
2952 | dev_info(&udev->dev, "not running at top speed; " | |
2953 | "connect to a high speed hub\n"); | |
2954 | /* hub LEDs are probably harder to miss than syslog */ | |
2955 | if (hub->has_indicators) { | |
2956 | hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; | |
c4028958 | 2957 | schedule_delayed_work (&hub->leds, 0); |
1da177e4 LT |
2958 | } |
2959 | } | |
1bc3c9e1 | 2960 | kfree(qual); |
1da177e4 LT |
2961 | } |
2962 | ||
2963 | static unsigned | |
2964 | hub_power_remaining (struct usb_hub *hub) | |
2965 | { | |
2966 | struct usb_device *hdev = hub->hdev; | |
2967 | int remaining; | |
55c52718 | 2968 | int port1; |
1da177e4 | 2969 | |
55c52718 | 2970 | if (!hub->limited_power) |
1da177e4 LT |
2971 | return 0; |
2972 | ||
55c52718 AS |
2973 | remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; |
2974 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
2975 | struct usb_device *udev = hdev->children[port1 - 1]; | |
2976 | int delta; | |
1da177e4 LT |
2977 | |
2978 | if (!udev) | |
2979 | continue; | |
2980 | ||
55c52718 AS |
2981 | /* Unconfigured devices may not use more than 100mA, |
2982 | * or 8mA for OTG ports */ | |
1da177e4 | 2983 | if (udev->actconfig) |
55c52718 AS |
2984 | delta = udev->actconfig->desc.bMaxPower * 2; |
2985 | else if (port1 != udev->bus->otg_port || hdev->parent) | |
2986 | delta = 100; | |
1da177e4 | 2987 | else |
55c52718 AS |
2988 | delta = 8; |
2989 | if (delta > hub->mA_per_port) | |
b9cef6c3 WF |
2990 | dev_warn(&udev->dev, |
2991 | "%dmA is over %umA budget for port %d!\n", | |
2992 | delta, hub->mA_per_port, port1); | |
1da177e4 LT |
2993 | remaining -= delta; |
2994 | } | |
2995 | if (remaining < 0) { | |
55c52718 AS |
2996 | dev_warn(hub->intfdev, "%dmA over power budget!\n", |
2997 | - remaining); | |
1da177e4 LT |
2998 | remaining = 0; |
2999 | } | |
3000 | return remaining; | |
3001 | } | |
3002 | ||
3003 | /* Handle physical or logical connection change events. | |
3004 | * This routine is called when: | |
3005 | * a port connection-change occurs; | |
3006 | * a port enable-change occurs (often caused by EMI); | |
742120c6 | 3007 | * usb_reset_and_verify_device() encounters changed descriptors (as from |
1da177e4 LT |
3008 | * a firmware download) |
3009 | * caller already locked the hub | |
3010 | */ | |
3011 | static void hub_port_connect_change(struct usb_hub *hub, int port1, | |
3012 | u16 portstatus, u16 portchange) | |
3013 | { | |
3014 | struct usb_device *hdev = hub->hdev; | |
3015 | struct device *hub_dev = hub->intfdev; | |
90da096e | 3016 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
24618b0c AS |
3017 | unsigned wHubCharacteristics = |
3018 | le16_to_cpu(hub->descriptor->wHubCharacteristics); | |
8808f00c | 3019 | struct usb_device *udev; |
1da177e4 | 3020 | int status, i; |
24618b0c | 3021 | |
1da177e4 LT |
3022 | dev_dbg (hub_dev, |
3023 | "port %d, status %04x, change %04x, %s\n", | |
3024 | port1, portstatus, portchange, portspeed (portstatus)); | |
3025 | ||
3026 | if (hub->has_indicators) { | |
3027 | set_port_led(hub, port1, HUB_LED_AUTO); | |
3028 | hub->indicator[port1-1] = INDICATOR_AUTO; | |
3029 | } | |
1da177e4 LT |
3030 | |
3031 | #ifdef CONFIG_USB_OTG | |
3032 | /* during HNP, don't repeat the debounce */ | |
3033 | if (hdev->bus->is_b_host) | |
24618b0c AS |
3034 | portchange &= ~(USB_PORT_STAT_C_CONNECTION | |
3035 | USB_PORT_STAT_C_ENABLE); | |
1da177e4 LT |
3036 | #endif |
3037 | ||
8808f00c AS |
3038 | /* Try to resuscitate an existing device */ |
3039 | udev = hdev->children[port1-1]; | |
3040 | if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && | |
3041 | udev->state != USB_STATE_NOTATTACHED) { | |
8808f00c AS |
3042 | usb_lock_device(udev); |
3043 | if (portstatus & USB_PORT_STAT_ENABLE) { | |
3044 | status = 0; /* Nothing to do */ | |
8808f00c AS |
3045 | |
3046 | #ifdef CONFIG_USB_SUSPEND | |
5257d97a AS |
3047 | } else if (udev->state == USB_STATE_SUSPENDED && |
3048 | udev->persist_enabled) { | |
8808f00c AS |
3049 | /* For a suspended device, treat this as a |
3050 | * remote wakeup event. | |
3051 | */ | |
0534d468 | 3052 | status = usb_remote_wakeup(udev); |
8808f00c AS |
3053 | #endif |
3054 | ||
3055 | } else { | |
5257d97a | 3056 | status = -ENODEV; /* Don't resuscitate */ |
8808f00c AS |
3057 | } |
3058 | usb_unlock_device(udev); | |
3059 | ||
3060 | if (status == 0) { | |
3061 | clear_bit(port1, hub->change_bits); | |
3062 | return; | |
3063 | } | |
3064 | } | |
3065 | ||
24618b0c | 3066 | /* Disconnect any existing devices under this port */ |
8808f00c | 3067 | if (udev) |
24618b0c AS |
3068 | usb_disconnect(&hdev->children[port1-1]); |
3069 | clear_bit(port1, hub->change_bits); | |
3070 | ||
253e0572 AS |
3071 | /* We can forget about a "removed" device when there's a physical |
3072 | * disconnect or the connect status changes. | |
3073 | */ | |
3074 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
3075 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
3076 | clear_bit(port1, hub->removed_bits); | |
3077 | ||
5257d97a AS |
3078 | if (portchange & (USB_PORT_STAT_C_CONNECTION | |
3079 | USB_PORT_STAT_C_ENABLE)) { | |
3080 | status = hub_port_debounce(hub, port1); | |
3081 | if (status < 0) { | |
3082 | if (printk_ratelimit()) | |
3083 | dev_err(hub_dev, "connect-debounce failed, " | |
3084 | "port %d disabled\n", port1); | |
3085 | portstatus &= ~USB_PORT_STAT_CONNECTION; | |
3086 | } else { | |
3087 | portstatus = status; | |
3088 | } | |
3089 | } | |
3090 | ||
253e0572 AS |
3091 | /* Return now if debouncing failed or nothing is connected or |
3092 | * the device was "removed". | |
3093 | */ | |
3094 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
3095 | test_bit(port1, hub->removed_bits)) { | |
1da177e4 LT |
3096 | |
3097 | /* maybe switch power back on (e.g. root hub was reset) */ | |
74ad9bd2 | 3098 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 |
749da5f8 | 3099 | && !(portstatus & USB_PORT_STAT_POWER)) |
1da177e4 | 3100 | set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
5257d97a | 3101 | |
1da177e4 LT |
3102 | if (portstatus & USB_PORT_STAT_ENABLE) |
3103 | goto done; | |
3104 | return; | |
3105 | } | |
3106 | ||
1da177e4 | 3107 | for (i = 0; i < SET_CONFIG_TRIES; i++) { |
1da177e4 LT |
3108 | |
3109 | /* reallocate for each attempt, since references | |
3110 | * to the previous one can escape in various ways | |
3111 | */ | |
3112 | udev = usb_alloc_dev(hdev, hdev->bus, port1); | |
3113 | if (!udev) { | |
3114 | dev_err (hub_dev, | |
3115 | "couldn't allocate port %d usb_device\n", | |
3116 | port1); | |
3117 | goto done; | |
3118 | } | |
3119 | ||
3120 | usb_set_device_state(udev, USB_STATE_POWERED); | |
55c52718 | 3121 | udev->bus_mA = hub->mA_per_port; |
b6956ffa | 3122 | udev->level = hdev->level + 1; |
8af548dc | 3123 | udev->wusb = hub_is_wusb(hub); |
55c52718 | 3124 | |
e7b77172 SS |
3125 | /* |
3126 | * USB 3.0 devices are reset automatically before the connect | |
3127 | * port status change appears, and the root hub port status | |
3128 | * shows the correct speed. We also get port change | |
3129 | * notifications for USB 3.0 devices from the USB 3.0 portion of | |
3130 | * an external USB 3.0 hub, but this isn't handled correctly yet | |
3131 | * FIXME. | |
3132 | */ | |
3133 | ||
3134 | if (!(hcd->driver->flags & HCD_USB3)) | |
3135 | udev->speed = USB_SPEED_UNKNOWN; | |
3136 | else if ((hdev->parent == NULL) && | |
288ead45 | 3137 | (portstatus & USB_PORT_STAT_SUPER_SPEED)) |
e7b77172 SS |
3138 | udev->speed = USB_SPEED_SUPER; |
3139 | else | |
3140 | udev->speed = USB_SPEED_UNKNOWN; | |
3141 | ||
3b29b68b | 3142 | choose_devnum(udev); |
c8d4af8e AX |
3143 | if (udev->devnum <= 0) { |
3144 | status = -ENOTCONN; /* Don't retry */ | |
3145 | goto loop; | |
c6515272 SS |
3146 | } |
3147 | ||
e7b77172 | 3148 | /* reset (non-USB 3.0 devices) and get descriptor */ |
1da177e4 LT |
3149 | status = hub_port_init(hub, udev, port1, i); |
3150 | if (status < 0) | |
3151 | goto loop; | |
3152 | ||
93362a87 PD |
3153 | usb_detect_quirks(udev); |
3154 | if (udev->quirks & USB_QUIRK_DELAY_INIT) | |
3155 | msleep(1000); | |
3156 | ||
1da177e4 LT |
3157 | /* consecutive bus-powered hubs aren't reliable; they can |
3158 | * violate the voltage drop budget. if the new child has | |
3159 | * a "powered" LED, users should notice we didn't enable it | |
3160 | * (without reading syslog), even without per-port LEDs | |
3161 | * on the parent. | |
3162 | */ | |
3163 | if (udev->descriptor.bDeviceClass == USB_CLASS_HUB | |
55c52718 | 3164 | && udev->bus_mA <= 100) { |
1da177e4 LT |
3165 | u16 devstat; |
3166 | ||
3167 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, | |
3168 | &devstat); | |
55c52718 | 3169 | if (status < 2) { |
1da177e4 LT |
3170 | dev_dbg(&udev->dev, "get status %d ?\n", status); |
3171 | goto loop_disable; | |
3172 | } | |
55c52718 | 3173 | le16_to_cpus(&devstat); |
1da177e4 LT |
3174 | if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
3175 | dev_err(&udev->dev, | |
3176 | "can't connect bus-powered hub " | |
3177 | "to this port\n"); | |
3178 | if (hub->has_indicators) { | |
3179 | hub->indicator[port1-1] = | |
3180 | INDICATOR_AMBER_BLINK; | |
c4028958 | 3181 | schedule_delayed_work (&hub->leds, 0); |
1da177e4 LT |
3182 | } |
3183 | status = -ENOTCONN; /* Don't retry */ | |
3184 | goto loop_disable; | |
3185 | } | |
3186 | } | |
3187 | ||
3188 | /* check for devices running slower than they could */ | |
3189 | if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 | |
3190 | && udev->speed == USB_SPEED_FULL | |
3191 | && highspeed_hubs != 0) | |
3192 | check_highspeed (hub, udev, port1); | |
3193 | ||
3194 | /* Store the parent's children[] pointer. At this point | |
3195 | * udev becomes globally accessible, although presumably | |
3196 | * no one will look at it until hdev is unlocked. | |
3197 | */ | |
1da177e4 LT |
3198 | status = 0; |
3199 | ||
3200 | /* We mustn't add new devices if the parent hub has | |
3201 | * been disconnected; we would race with the | |
3202 | * recursively_mark_NOTATTACHED() routine. | |
3203 | */ | |
3204 | spin_lock_irq(&device_state_lock); | |
3205 | if (hdev->state == USB_STATE_NOTATTACHED) | |
3206 | status = -ENOTCONN; | |
3207 | else | |
3208 | hdev->children[port1-1] = udev; | |
3209 | spin_unlock_irq(&device_state_lock); | |
3210 | ||
3211 | /* Run it through the hoops (find a driver, etc) */ | |
3212 | if (!status) { | |
3213 | status = usb_new_device(udev); | |
3214 | if (status) { | |
3215 | spin_lock_irq(&device_state_lock); | |
3216 | hdev->children[port1-1] = NULL; | |
3217 | spin_unlock_irq(&device_state_lock); | |
3218 | } | |
3219 | } | |
3220 | ||
1da177e4 LT |
3221 | if (status) |
3222 | goto loop_disable; | |
3223 | ||
3224 | status = hub_power_remaining(hub); | |
3225 | if (status) | |
55c52718 | 3226 | dev_dbg(hub_dev, "%dmA power budget left\n", status); |
1da177e4 LT |
3227 | |
3228 | return; | |
3229 | ||
3230 | loop_disable: | |
3231 | hub_port_disable(hub, port1, 1); | |
3232 | loop: | |
fc721f51 | 3233 | usb_ep0_reinit(udev); |
3b29b68b | 3234 | release_devnum(udev); |
f7410ced | 3235 | hub_free_dev(udev); |
1da177e4 | 3236 | usb_put_dev(udev); |
ffcdc18d | 3237 | if ((status == -ENOTCONN) || (status == -ENOTSUPP)) |
1da177e4 LT |
3238 | break; |
3239 | } | |
3a31155c AS |
3240 | if (hub->hdev->parent || |
3241 | !hcd->driver->port_handed_over || | |
3242 | !(hcd->driver->port_handed_over)(hcd, port1)) | |
3243 | dev_err(hub_dev, "unable to enumerate USB device on port %d\n", | |
3244 | port1); | |
1da177e4 LT |
3245 | |
3246 | done: | |
3247 | hub_port_disable(hub, port1, 1); | |
90da096e BR |
3248 | if (hcd->driver->relinquish_port && !hub->hdev->parent) |
3249 | hcd->driver->relinquish_port(hcd, port1); | |
1da177e4 LT |
3250 | } |
3251 | ||
3252 | static void hub_events(void) | |
3253 | { | |
3254 | struct list_head *tmp; | |
3255 | struct usb_device *hdev; | |
3256 | struct usb_interface *intf; | |
3257 | struct usb_hub *hub; | |
3258 | struct device *hub_dev; | |
3259 | u16 hubstatus; | |
3260 | u16 hubchange; | |
3261 | u16 portstatus; | |
3262 | u16 portchange; | |
3263 | int i, ret; | |
3264 | int connect_change; | |
3265 | ||
3266 | /* | |
3267 | * We restart the list every time to avoid a deadlock with | |
3268 | * deleting hubs downstream from this one. This should be | |
3269 | * safe since we delete the hub from the event list. | |
3270 | * Not the most efficient, but avoids deadlocks. | |
3271 | */ | |
3272 | while (1) { | |
3273 | ||
3274 | /* Grab the first entry at the beginning of the list */ | |
3275 | spin_lock_irq(&hub_event_lock); | |
3276 | if (list_empty(&hub_event_list)) { | |
3277 | spin_unlock_irq(&hub_event_lock); | |
3278 | break; | |
3279 | } | |
3280 | ||
3281 | tmp = hub_event_list.next; | |
3282 | list_del_init(tmp); | |
3283 | ||
3284 | hub = list_entry(tmp, struct usb_hub, event_list); | |
e8054854 AS |
3285 | kref_get(&hub->kref); |
3286 | spin_unlock_irq(&hub_event_lock); | |
1da177e4 | 3287 | |
e8054854 AS |
3288 | hdev = hub->hdev; |
3289 | hub_dev = hub->intfdev; | |
3290 | intf = to_usb_interface(hub_dev); | |
40f122f3 | 3291 | dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", |
1da177e4 LT |
3292 | hdev->state, hub->descriptor |
3293 | ? hub->descriptor->bNbrPorts | |
3294 | : 0, | |
3295 | /* NOTE: expects max 15 ports... */ | |
3296 | (u16) hub->change_bits[0], | |
40f122f3 | 3297 | (u16) hub->event_bits[0]); |
1da177e4 | 3298 | |
1da177e4 LT |
3299 | /* Lock the device, then check to see if we were |
3300 | * disconnected while waiting for the lock to succeed. */ | |
06b84e8a | 3301 | usb_lock_device(hdev); |
e8054854 | 3302 | if (unlikely(hub->disconnected)) |
9bbdf1e0 | 3303 | goto loop_disconnected; |
1da177e4 LT |
3304 | |
3305 | /* If the hub has died, clean up after it */ | |
3306 | if (hdev->state == USB_STATE_NOTATTACHED) { | |
7de18d8b | 3307 | hub->error = -ENODEV; |
4330354f | 3308 | hub_quiesce(hub, HUB_DISCONNECT); |
1da177e4 LT |
3309 | goto loop; |
3310 | } | |
3311 | ||
40f122f3 AS |
3312 | /* Autoresume */ |
3313 | ret = usb_autopm_get_interface(intf); | |
3314 | if (ret) { | |
3315 | dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); | |
3316 | goto loop; | |
3317 | } | |
a8e7c565 | 3318 | |
40f122f3 | 3319 | /* If this is an inactive hub, do nothing */ |
1da177e4 | 3320 | if (hub->quiescing) |
40f122f3 | 3321 | goto loop_autopm; |
1da177e4 LT |
3322 | |
3323 | if (hub->error) { | |
3324 | dev_dbg (hub_dev, "resetting for error %d\n", | |
3325 | hub->error); | |
3326 | ||
742120c6 | 3327 | ret = usb_reset_device(hdev); |
1da177e4 LT |
3328 | if (ret) { |
3329 | dev_dbg (hub_dev, | |
3330 | "error resetting hub: %d\n", ret); | |
40f122f3 | 3331 | goto loop_autopm; |
1da177e4 LT |
3332 | } |
3333 | ||
3334 | hub->nerrors = 0; | |
3335 | hub->error = 0; | |
3336 | } | |
3337 | ||
3338 | /* deal with port status changes */ | |
3339 | for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { | |
3340 | if (test_bit(i, hub->busy_bits)) | |
3341 | continue; | |
3342 | connect_change = test_bit(i, hub->change_bits); | |
3343 | if (!test_and_clear_bit(i, hub->event_bits) && | |
6ee0b270 | 3344 | !connect_change) |
1da177e4 LT |
3345 | continue; |
3346 | ||
3347 | ret = hub_port_status(hub, i, | |
3348 | &portstatus, &portchange); | |
3349 | if (ret < 0) | |
3350 | continue; | |
3351 | ||
1da177e4 LT |
3352 | if (portchange & USB_PORT_STAT_C_CONNECTION) { |
3353 | clear_port_feature(hdev, i, | |
3354 | USB_PORT_FEAT_C_CONNECTION); | |
3355 | connect_change = 1; | |
3356 | } | |
3357 | ||
3358 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
3359 | if (!connect_change) | |
3360 | dev_dbg (hub_dev, | |
3361 | "port %d enable change, " | |
3362 | "status %08x\n", | |
3363 | i, portstatus); | |
3364 | clear_port_feature(hdev, i, | |
3365 | USB_PORT_FEAT_C_ENABLE); | |
3366 | ||
3367 | /* | |
3368 | * EM interference sometimes causes badly | |
3369 | * shielded USB devices to be shutdown by | |
3370 | * the hub, this hack enables them again. | |
3371 | * Works at least with mouse driver. | |
3372 | */ | |
3373 | if (!(portstatus & USB_PORT_STAT_ENABLE) | |
3374 | && !connect_change | |
3375 | && hdev->children[i-1]) { | |
3376 | dev_err (hub_dev, | |
3377 | "port %i " | |
3378 | "disabled by hub (EMI?), " | |
3379 | "re-enabling...\n", | |
3380 | i); | |
3381 | connect_change = 1; | |
3382 | } | |
3383 | } | |
3384 | ||
3385 | if (portchange & USB_PORT_STAT_C_SUSPEND) { | |
8808f00c AS |
3386 | struct usb_device *udev; |
3387 | ||
1da177e4 LT |
3388 | clear_port_feature(hdev, i, |
3389 | USB_PORT_FEAT_C_SUSPEND); | |
8808f00c AS |
3390 | udev = hdev->children[i-1]; |
3391 | if (udev) { | |
49d0f078 AS |
3392 | /* TRSMRCY = 10 msec */ |
3393 | msleep(10); | |
3394 | ||
8808f00c | 3395 | usb_lock_device(udev); |
0534d468 | 3396 | ret = usb_remote_wakeup(hdev-> |
1da177e4 | 3397 | children[i-1]); |
8808f00c | 3398 | usb_unlock_device(udev); |
1da177e4 LT |
3399 | if (ret < 0) |
3400 | connect_change = 1; | |
3401 | } else { | |
3402 | ret = -ENODEV; | |
3403 | hub_port_disable(hub, i, 1); | |
3404 | } | |
3405 | dev_dbg (hub_dev, | |
3406 | "resume on port %d, status %d\n", | |
3407 | i, ret); | |
3408 | } | |
3409 | ||
3410 | if (portchange & USB_PORT_STAT_C_OVERCURRENT) { | |
3411 | dev_err (hub_dev, | |
3412 | "over-current change on port %d\n", | |
3413 | i); | |
3414 | clear_port_feature(hdev, i, | |
3415 | USB_PORT_FEAT_C_OVER_CURRENT); | |
8520f380 | 3416 | hub_power_on(hub, true); |
1da177e4 LT |
3417 | } |
3418 | ||
3419 | if (portchange & USB_PORT_STAT_C_RESET) { | |
3420 | dev_dbg (hub_dev, | |
3421 | "reset change on port %d\n", | |
3422 | i); | |
3423 | clear_port_feature(hdev, i, | |
3424 | USB_PORT_FEAT_C_RESET); | |
3425 | } | |
3426 | ||
3427 | if (connect_change) | |
3428 | hub_port_connect_change(hub, i, | |
3429 | portstatus, portchange); | |
3430 | } /* end for i */ | |
3431 | ||
3432 | /* deal with hub status changes */ | |
3433 | if (test_and_clear_bit(0, hub->event_bits) == 0) | |
3434 | ; /* do nothing */ | |
3435 | else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) | |
3436 | dev_err (hub_dev, "get_hub_status failed\n"); | |
3437 | else { | |
3438 | if (hubchange & HUB_CHANGE_LOCAL_POWER) { | |
3439 | dev_dbg (hub_dev, "power change\n"); | |
3440 | clear_hub_feature(hdev, C_HUB_LOCAL_POWER); | |
55c52718 AS |
3441 | if (hubstatus & HUB_STATUS_LOCAL_POWER) |
3442 | /* FIXME: Is this always true? */ | |
55c52718 | 3443 | hub->limited_power = 1; |
403fae78 | 3444 | else |
3445 | hub->limited_power = 0; | |
1da177e4 LT |
3446 | } |
3447 | if (hubchange & HUB_CHANGE_OVERCURRENT) { | |
3448 | dev_dbg (hub_dev, "overcurrent change\n"); | |
3449 | msleep(500); /* Cool down */ | |
3450 | clear_hub_feature(hdev, C_HUB_OVER_CURRENT); | |
8520f380 | 3451 | hub_power_on(hub, true); |
1da177e4 LT |
3452 | } |
3453 | } | |
3454 | ||
8e4ceb38 AS |
3455 | loop_autopm: |
3456 | /* Balance the usb_autopm_get_interface() above */ | |
3457 | usb_autopm_put_interface_no_suspend(intf); | |
3458 | loop: | |
3459 | /* Balance the usb_autopm_get_interface_no_resume() in | |
3460 | * kick_khubd() and allow autosuspend. | |
3461 | */ | |
3462 | usb_autopm_put_interface(intf); | |
9bbdf1e0 | 3463 | loop_disconnected: |
1da177e4 | 3464 | usb_unlock_device(hdev); |
e8054854 | 3465 | kref_put(&hub->kref, hub_release); |
1da177e4 LT |
3466 | |
3467 | } /* end while (1) */ | |
3468 | } | |
3469 | ||
3470 | static int hub_thread(void *__unused) | |
3471 | { | |
3bb1af52 AS |
3472 | /* khubd needs to be freezable to avoid intefering with USB-PERSIST |
3473 | * port handover. Otherwise it might see that a full-speed device | |
3474 | * was gone before the EHCI controller had handed its port over to | |
3475 | * the companion full-speed controller. | |
3476 | */ | |
83144186 | 3477 | set_freezable(); |
3bb1af52 | 3478 | |
1da177e4 LT |
3479 | do { |
3480 | hub_events(); | |
e42837bc | 3481 | wait_event_freezable(khubd_wait, |
9c8d6178 | 3482 | !list_empty(&hub_event_list) || |
3483 | kthread_should_stop()); | |
9c8d6178 | 3484 | } while (!kthread_should_stop() || !list_empty(&hub_event_list)); |
1da177e4 | 3485 | |
9c8d6178 | 3486 | pr_debug("%s: khubd exiting\n", usbcore_name); |
3487 | return 0; | |
1da177e4 LT |
3488 | } |
3489 | ||
1e927d96 | 3490 | static const struct usb_device_id hub_id_table[] = { |
1da177e4 LT |
3491 | { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, |
3492 | .bDeviceClass = USB_CLASS_HUB}, | |
3493 | { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, | |
3494 | .bInterfaceClass = USB_CLASS_HUB}, | |
3495 | { } /* Terminating entry */ | |
3496 | }; | |
3497 | ||
3498 | MODULE_DEVICE_TABLE (usb, hub_id_table); | |
3499 | ||
3500 | static struct usb_driver hub_driver = { | |
1da177e4 LT |
3501 | .name = "hub", |
3502 | .probe = hub_probe, | |
3503 | .disconnect = hub_disconnect, | |
3504 | .suspend = hub_suspend, | |
3505 | .resume = hub_resume, | |
f07600cf | 3506 | .reset_resume = hub_reset_resume, |
7de18d8b AS |
3507 | .pre_reset = hub_pre_reset, |
3508 | .post_reset = hub_post_reset, | |
c532b29a | 3509 | .unlocked_ioctl = hub_ioctl, |
1da177e4 | 3510 | .id_table = hub_id_table, |
40f122f3 | 3511 | .supports_autosuspend = 1, |
1da177e4 LT |
3512 | }; |
3513 | ||
3514 | int usb_hub_init(void) | |
3515 | { | |
1da177e4 LT |
3516 | if (usb_register(&hub_driver) < 0) { |
3517 | printk(KERN_ERR "%s: can't register hub driver\n", | |
3518 | usbcore_name); | |
3519 | return -1; | |
3520 | } | |
3521 | ||
9c8d6178 | 3522 | khubd_task = kthread_run(hub_thread, NULL, "khubd"); |
3523 | if (!IS_ERR(khubd_task)) | |
1da177e4 | 3524 | return 0; |
1da177e4 LT |
3525 | |
3526 | /* Fall through if kernel_thread failed */ | |
3527 | usb_deregister(&hub_driver); | |
3528 | printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); | |
3529 | ||
3530 | return -1; | |
3531 | } | |
3532 | ||
3533 | void usb_hub_cleanup(void) | |
3534 | { | |
9c8d6178 | 3535 | kthread_stop(khubd_task); |
1da177e4 LT |
3536 | |
3537 | /* | |
3538 | * Hub resources are freed for us by usb_deregister. It calls | |
3539 | * usb_driver_purge on every device which in turn calls that | |
3540 | * devices disconnect function if it is using this driver. | |
3541 | * The hub_disconnect function takes care of releasing the | |
3542 | * individual hub resources. -greg | |
3543 | */ | |
3544 | usb_deregister(&hub_driver); | |
3545 | } /* usb_hub_cleanup() */ | |
3546 | ||
eb764c4b AS |
3547 | static int descriptors_changed(struct usb_device *udev, |
3548 | struct usb_device_descriptor *old_device_descriptor) | |
3549 | { | |
3550 | int changed = 0; | |
3551 | unsigned index; | |
3552 | unsigned serial_len = 0; | |
3553 | unsigned len; | |
3554 | unsigned old_length; | |
3555 | int length; | |
3556 | char *buf; | |
3557 | ||
3558 | if (memcmp(&udev->descriptor, old_device_descriptor, | |
3559 | sizeof(*old_device_descriptor)) != 0) | |
3560 | return 1; | |
3561 | ||
3562 | /* Since the idVendor, idProduct, and bcdDevice values in the | |
3563 | * device descriptor haven't changed, we will assume the | |
3564 | * Manufacturer and Product strings haven't changed either. | |
3565 | * But the SerialNumber string could be different (e.g., a | |
3566 | * different flash card of the same brand). | |
3567 | */ | |
3568 | if (udev->serial) | |
3569 | serial_len = strlen(udev->serial) + 1; | |
1da177e4 | 3570 | |
eb764c4b | 3571 | len = serial_len; |
1da177e4 | 3572 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
eb764c4b AS |
3573 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
3574 | len = max(len, old_length); | |
1da177e4 | 3575 | } |
eb764c4b | 3576 | |
0cc1a51f | 3577 | buf = kmalloc(len, GFP_NOIO); |
1da177e4 LT |
3578 | if (buf == NULL) { |
3579 | dev_err(&udev->dev, "no mem to re-read configs after reset\n"); | |
3580 | /* assume the worst */ | |
3581 | return 1; | |
3582 | } | |
3583 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { | |
eb764c4b | 3584 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
1da177e4 LT |
3585 | length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, |
3586 | old_length); | |
eb764c4b | 3587 | if (length != old_length) { |
1da177e4 LT |
3588 | dev_dbg(&udev->dev, "config index %d, error %d\n", |
3589 | index, length); | |
eb764c4b | 3590 | changed = 1; |
1da177e4 LT |
3591 | break; |
3592 | } | |
3593 | if (memcmp (buf, udev->rawdescriptors[index], old_length) | |
3594 | != 0) { | |
3595 | dev_dbg(&udev->dev, "config index %d changed (#%d)\n", | |
eb764c4b AS |
3596 | index, |
3597 | ((struct usb_config_descriptor *) buf)-> | |
3598 | bConfigurationValue); | |
3599 | changed = 1; | |
1da177e4 LT |
3600 | break; |
3601 | } | |
3602 | } | |
eb764c4b AS |
3603 | |
3604 | if (!changed && serial_len) { | |
3605 | length = usb_string(udev, udev->descriptor.iSerialNumber, | |
3606 | buf, serial_len); | |
3607 | if (length + 1 != serial_len) { | |
3608 | dev_dbg(&udev->dev, "serial string error %d\n", | |
3609 | length); | |
3610 | changed = 1; | |
3611 | } else if (memcmp(buf, udev->serial, length) != 0) { | |
3612 | dev_dbg(&udev->dev, "serial string changed\n"); | |
3613 | changed = 1; | |
3614 | } | |
3615 | } | |
3616 | ||
1da177e4 | 3617 | kfree(buf); |
eb764c4b | 3618 | return changed; |
1da177e4 LT |
3619 | } |
3620 | ||
3621 | /** | |
742120c6 | 3622 | * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device |
1da177e4 LT |
3623 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
3624 | * | |
79efa097 AS |
3625 | * WARNING - don't use this routine to reset a composite device |
3626 | * (one with multiple interfaces owned by separate drivers)! | |
742120c6 | 3627 | * Use usb_reset_device() instead. |
1da177e4 LT |
3628 | * |
3629 | * Do a port reset, reassign the device's address, and establish its | |
3630 | * former operating configuration. If the reset fails, or the device's | |
3631 | * descriptors change from their values before the reset, or the original | |
3632 | * configuration and altsettings cannot be restored, a flag will be set | |
3633 | * telling khubd to pretend the device has been disconnected and then | |
3634 | * re-connected. All drivers will be unbound, and the device will be | |
3635 | * re-enumerated and probed all over again. | |
3636 | * | |
3637 | * Returns 0 if the reset succeeded, -ENODEV if the device has been | |
3638 | * flagged for logical disconnection, or some other negative error code | |
3639 | * if the reset wasn't even attempted. | |
3640 | * | |
3641 | * The caller must own the device lock. For example, it's safe to use | |
3642 | * this from a driver probe() routine after downloading new firmware. | |
3643 | * For calls that might not occur during probe(), drivers should lock | |
3644 | * the device using usb_lock_device_for_reset(). | |
6bc6cff5 AS |
3645 | * |
3646 | * Locking exception: This routine may also be called from within an | |
3647 | * autoresume handler. Such usage won't conflict with other tasks | |
3648 | * holding the device lock because these tasks should always call | |
3649 | * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. | |
1da177e4 | 3650 | */ |
742120c6 | 3651 | static int usb_reset_and_verify_device(struct usb_device *udev) |
1da177e4 LT |
3652 | { |
3653 | struct usb_device *parent_hdev = udev->parent; | |
3654 | struct usb_hub *parent_hub; | |
3f0479e0 | 3655 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 3656 | struct usb_device_descriptor descriptor = udev->descriptor; |
12c3da34 AS |
3657 | int i, ret = 0; |
3658 | int port1 = udev->portnum; | |
1da177e4 LT |
3659 | |
3660 | if (udev->state == USB_STATE_NOTATTACHED || | |
3661 | udev->state == USB_STATE_SUSPENDED) { | |
3662 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
3663 | udev->state); | |
3664 | return -EINVAL; | |
3665 | } | |
3666 | ||
3667 | if (!parent_hdev) { | |
4bec9917 | 3668 | /* this requires hcd-specific logic; see ohci_restart() */ |
441b62c1 | 3669 | dev_dbg(&udev->dev, "%s for root hub!\n", __func__); |
1da177e4 LT |
3670 | return -EISDIR; |
3671 | } | |
1da177e4 LT |
3672 | parent_hub = hdev_to_hub(parent_hdev); |
3673 | ||
1da177e4 LT |
3674 | set_bit(port1, parent_hub->busy_bits); |
3675 | for (i = 0; i < SET_CONFIG_TRIES; ++i) { | |
3676 | ||
3677 | /* ep0 maxpacket size may change; let the HCD know about it. | |
3678 | * Other endpoints will be handled by re-enumeration. */ | |
fc721f51 | 3679 | usb_ep0_reinit(udev); |
1da177e4 | 3680 | ret = hub_port_init(parent_hub, udev, port1, i); |
dd4dd19e | 3681 | if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) |
1da177e4 LT |
3682 | break; |
3683 | } | |
3684 | clear_bit(port1, parent_hub->busy_bits); | |
d5cbad4b | 3685 | |
1da177e4 LT |
3686 | if (ret < 0) |
3687 | goto re_enumerate; | |
3688 | ||
3689 | /* Device might have changed firmware (DFU or similar) */ | |
eb764c4b | 3690 | if (descriptors_changed(udev, &descriptor)) { |
1da177e4 LT |
3691 | dev_info(&udev->dev, "device firmware changed\n"); |
3692 | udev->descriptor = descriptor; /* for disconnect() calls */ | |
3693 | goto re_enumerate; | |
3694 | } | |
4fe0387a AS |
3695 | |
3696 | /* Restore the device's previous configuration */ | |
1da177e4 LT |
3697 | if (!udev->actconfig) |
3698 | goto done; | |
3f0479e0 SS |
3699 | |
3700 | mutex_lock(&hcd->bandwidth_mutex); | |
3701 | ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); | |
3702 | if (ret < 0) { | |
3703 | dev_warn(&udev->dev, | |
3704 | "Busted HC? Not enough HCD resources for " | |
3705 | "old configuration.\n"); | |
3706 | mutex_unlock(&hcd->bandwidth_mutex); | |
3707 | goto re_enumerate; | |
3708 | } | |
1da177e4 LT |
3709 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
3710 | USB_REQ_SET_CONFIGURATION, 0, | |
3711 | udev->actconfig->desc.bConfigurationValue, 0, | |
3712 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
3713 | if (ret < 0) { | |
3714 | dev_err(&udev->dev, | |
3715 | "can't restore configuration #%d (error=%d)\n", | |
3716 | udev->actconfig->desc.bConfigurationValue, ret); | |
3f0479e0 | 3717 | mutex_unlock(&hcd->bandwidth_mutex); |
1da177e4 LT |
3718 | goto re_enumerate; |
3719 | } | |
3f0479e0 | 3720 | mutex_unlock(&hcd->bandwidth_mutex); |
1da177e4 LT |
3721 | usb_set_device_state(udev, USB_STATE_CONFIGURED); |
3722 | ||
4fe0387a AS |
3723 | /* Put interfaces back into the same altsettings as before. |
3724 | * Don't bother to send the Set-Interface request for interfaces | |
3725 | * that were already in altsetting 0; besides being unnecessary, | |
3726 | * many devices can't handle it. Instead just reset the host-side | |
3727 | * endpoint state. | |
3728 | */ | |
1da177e4 | 3729 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
3f0479e0 SS |
3730 | struct usb_host_config *config = udev->actconfig; |
3731 | struct usb_interface *intf = config->interface[i]; | |
1da177e4 LT |
3732 | struct usb_interface_descriptor *desc; |
3733 | ||
1da177e4 | 3734 | desc = &intf->cur_altsetting->desc; |
4fe0387a AS |
3735 | if (desc->bAlternateSetting == 0) { |
3736 | usb_disable_interface(udev, intf, true); | |
3737 | usb_enable_interface(udev, intf, true); | |
3738 | ret = 0; | |
3739 | } else { | |
04a723ea SS |
3740 | /* Let the bandwidth allocation function know that this |
3741 | * device has been reset, and it will have to use | |
3742 | * alternate setting 0 as the current alternate setting. | |
3f0479e0 | 3743 | */ |
04a723ea | 3744 | intf->resetting_device = 1; |
4fe0387a AS |
3745 | ret = usb_set_interface(udev, desc->bInterfaceNumber, |
3746 | desc->bAlternateSetting); | |
04a723ea | 3747 | intf->resetting_device = 0; |
4fe0387a | 3748 | } |
1da177e4 LT |
3749 | if (ret < 0) { |
3750 | dev_err(&udev->dev, "failed to restore interface %d " | |
3751 | "altsetting %d (error=%d)\n", | |
3752 | desc->bInterfaceNumber, | |
3753 | desc->bAlternateSetting, | |
3754 | ret); | |
3755 | goto re_enumerate; | |
3756 | } | |
3757 | } | |
3758 | ||
3759 | done: | |
1da177e4 LT |
3760 | return 0; |
3761 | ||
3762 | re_enumerate: | |
3763 | hub_port_logical_disconnect(parent_hub, port1); | |
3764 | return -ENODEV; | |
3765 | } | |
79efa097 AS |
3766 | |
3767 | /** | |
742120c6 | 3768 | * usb_reset_device - warn interface drivers and perform a USB port reset |
79efa097 | 3769 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
79efa097 AS |
3770 | * |
3771 | * Warns all drivers bound to registered interfaces (using their pre_reset | |
3772 | * method), performs the port reset, and then lets the drivers know that | |
3773 | * the reset is over (using their post_reset method). | |
3774 | * | |
742120c6 | 3775 | * Return value is the same as for usb_reset_and_verify_device(). |
79efa097 AS |
3776 | * |
3777 | * The caller must own the device lock. For example, it's safe to use | |
3778 | * this from a driver probe() routine after downloading new firmware. | |
3779 | * For calls that might not occur during probe(), drivers should lock | |
3780 | * the device using usb_lock_device_for_reset(). | |
78d9a487 AS |
3781 | * |
3782 | * If an interface is currently being probed or disconnected, we assume | |
3783 | * its driver knows how to handle resets. For all other interfaces, | |
3784 | * if the driver doesn't have pre_reset and post_reset methods then | |
3785 | * we attempt to unbind it and rebind afterward. | |
79efa097 | 3786 | */ |
742120c6 | 3787 | int usb_reset_device(struct usb_device *udev) |
79efa097 AS |
3788 | { |
3789 | int ret; | |
852c4b43 | 3790 | int i; |
79efa097 AS |
3791 | struct usb_host_config *config = udev->actconfig; |
3792 | ||
3793 | if (udev->state == USB_STATE_NOTATTACHED || | |
3794 | udev->state == USB_STATE_SUSPENDED) { | |
3795 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
3796 | udev->state); | |
3797 | return -EINVAL; | |
3798 | } | |
3799 | ||
645daaab | 3800 | /* Prevent autosuspend during the reset */ |
94fcda1f | 3801 | usb_autoresume_device(udev); |
645daaab | 3802 | |
79efa097 | 3803 | if (config) { |
79efa097 | 3804 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { |
852c4b43 AS |
3805 | struct usb_interface *cintf = config->interface[i]; |
3806 | struct usb_driver *drv; | |
78d9a487 | 3807 | int unbind = 0; |
852c4b43 AS |
3808 | |
3809 | if (cintf->dev.driver) { | |
79efa097 | 3810 | drv = to_usb_driver(cintf->dev.driver); |
78d9a487 AS |
3811 | if (drv->pre_reset && drv->post_reset) |
3812 | unbind = (drv->pre_reset)(cintf); | |
3813 | else if (cintf->condition == | |
3814 | USB_INTERFACE_BOUND) | |
3815 | unbind = 1; | |
3816 | if (unbind) | |
3817 | usb_forced_unbind_intf(cintf); | |
79efa097 AS |
3818 | } |
3819 | } | |
3820 | } | |
3821 | ||
742120c6 | 3822 | ret = usb_reset_and_verify_device(udev); |
79efa097 AS |
3823 | |
3824 | if (config) { | |
79efa097 | 3825 | for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { |
852c4b43 AS |
3826 | struct usb_interface *cintf = config->interface[i]; |
3827 | struct usb_driver *drv; | |
78d9a487 | 3828 | int rebind = cintf->needs_binding; |
852c4b43 | 3829 | |
78d9a487 | 3830 | if (!rebind && cintf->dev.driver) { |
79efa097 AS |
3831 | drv = to_usb_driver(cintf->dev.driver); |
3832 | if (drv->post_reset) | |
78d9a487 AS |
3833 | rebind = (drv->post_reset)(cintf); |
3834 | else if (cintf->condition == | |
3835 | USB_INTERFACE_BOUND) | |
3836 | rebind = 1; | |
79efa097 | 3837 | } |
6c640945 | 3838 | if (ret == 0 && rebind) |
78d9a487 | 3839 | usb_rebind_intf(cintf); |
79efa097 AS |
3840 | } |
3841 | } | |
3842 | ||
94fcda1f | 3843 | usb_autosuspend_device(udev); |
79efa097 AS |
3844 | return ret; |
3845 | } | |
742120c6 | 3846 | EXPORT_SYMBOL_GPL(usb_reset_device); |
dc023dce IPG |
3847 | |
3848 | ||
3849 | /** | |
3850 | * usb_queue_reset_device - Reset a USB device from an atomic context | |
3851 | * @iface: USB interface belonging to the device to reset | |
3852 | * | |
3853 | * This function can be used to reset a USB device from an atomic | |
3854 | * context, where usb_reset_device() won't work (as it blocks). | |
3855 | * | |
3856 | * Doing a reset via this method is functionally equivalent to calling | |
3857 | * usb_reset_device(), except for the fact that it is delayed to a | |
3858 | * workqueue. This means that any drivers bound to other interfaces | |
3859 | * might be unbound, as well as users from usbfs in user space. | |
3860 | * | |
3861 | * Corner cases: | |
3862 | * | |
3863 | * - Scheduling two resets at the same time from two different drivers | |
3864 | * attached to two different interfaces of the same device is | |
3865 | * possible; depending on how the driver attached to each interface | |
3866 | * handles ->pre_reset(), the second reset might happen or not. | |
3867 | * | |
3868 | * - If a driver is unbound and it had a pending reset, the reset will | |
3869 | * be cancelled. | |
3870 | * | |
3871 | * - This function can be called during .probe() or .disconnect() | |
3872 | * times. On return from .disconnect(), any pending resets will be | |
3873 | * cancelled. | |
3874 | * | |
3875 | * There is no no need to lock/unlock the @reset_ws as schedule_work() | |
3876 | * does its own. | |
3877 | * | |
3878 | * NOTE: We don't do any reference count tracking because it is not | |
3879 | * needed. The lifecycle of the work_struct is tied to the | |
3880 | * usb_interface. Before destroying the interface we cancel the | |
3881 | * work_struct, so the fact that work_struct is queued and or | |
3882 | * running means the interface (and thus, the device) exist and | |
3883 | * are referenced. | |
3884 | */ | |
3885 | void usb_queue_reset_device(struct usb_interface *iface) | |
3886 | { | |
3887 | schedule_work(&iface->reset_ws); | |
3888 | } | |
3889 | EXPORT_SYMBOL_GPL(usb_queue_reset_device); |