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> | |
9c8d6178 | 22 | #include <linux/kthread.h> |
4186ecf8 | 23 | #include <linux/mutex.h> |
7dfb7103 | 24 | #include <linux/freezer.h> |
1da177e4 | 25 | |
1da177e4 LT |
26 | #include <asm/uaccess.h> |
27 | #include <asm/byteorder.h> | |
28 | ||
29 | #include "usb.h" | |
30 | #include "hcd.h" | |
31 | #include "hub.h" | |
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]; | |
48 | dma_addr_t buffer_dma; /* DMA address for buffer */ | |
49 | union { | |
50 | struct usb_hub_status hub; | |
51 | struct usb_port_status port; | |
52 | } *status; /* buffer for status reports */ | |
db90e7a1 | 53 | struct mutex status_mutex; /* for the status buffer */ |
1bb5f66b AS |
54 | |
55 | int error; /* last reported error */ | |
56 | int nerrors; /* track consecutive errors */ | |
57 | ||
58 | struct list_head event_list; /* hubs w/data or errs ready */ | |
59 | unsigned long event_bits[1]; /* status change bitmask */ | |
60 | unsigned long change_bits[1]; /* ports with logical connect | |
61 | status change */ | |
62 | unsigned long busy_bits[1]; /* ports being reset or | |
63 | resumed */ | |
64 | #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */ | |
65 | #error event_bits[] is too short! | |
66 | #endif | |
67 | ||
68 | struct usb_hub_descriptor *descriptor; /* class descriptor */ | |
69 | struct usb_tt tt; /* Transaction Translator */ | |
70 | ||
71 | unsigned mA_per_port; /* current for each child */ | |
72 | ||
73 | unsigned limited_power:1; | |
74 | unsigned quiescing:1; | |
e8054854 | 75 | unsigned disconnected:1; |
1bb5f66b AS |
76 | |
77 | unsigned has_indicators:1; | |
78 | u8 indicator[USB_MAXCHILDREN]; | |
6d5aefb8 | 79 | struct delayed_work leds; |
8520f380 | 80 | struct delayed_work init_work; |
1bb5f66b AS |
81 | }; |
82 | ||
83 | ||
1da177e4 | 84 | /* Protect struct usb_device->state and ->children members |
9ad3d6cc | 85 | * Note: Both are also protected by ->dev.sem, except that ->state can |
1da177e4 LT |
86 | * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ |
87 | static DEFINE_SPINLOCK(device_state_lock); | |
88 | ||
89 | /* khubd's worklist and its lock */ | |
90 | static DEFINE_SPINLOCK(hub_event_lock); | |
91 | static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ | |
92 | ||
93 | /* Wakes up khubd */ | |
94 | static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); | |
95 | ||
9c8d6178 | 96 | static struct task_struct *khubd_task; |
1da177e4 LT |
97 | |
98 | /* cycle leds on hubs that aren't blinking for attention */ | |
99 | static int blinkenlights = 0; | |
100 | module_param (blinkenlights, bool, S_IRUGO); | |
101 | MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); | |
102 | ||
fd7c519d JK |
103 | /* |
104 | * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about | |
105 | * 10 seconds to send reply for the initial 64-byte descriptor request. | |
106 | */ | |
107 | /* define initial 64-byte descriptor request timeout in milliseconds */ | |
108 | static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; | |
109 | module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); | |
110 | MODULE_PARM_DESC(initial_descriptor_timeout, "initial 64-byte descriptor request timeout in milliseconds (default 5000 - 5.0 seconds)"); | |
111 | ||
1da177e4 LT |
112 | /* |
113 | * As of 2.6.10 we introduce a new USB device initialization scheme which | |
114 | * closely resembles the way Windows works. Hopefully it will be compatible | |
115 | * with a wider range of devices than the old scheme. However some previously | |
116 | * working devices may start giving rise to "device not accepting address" | |
117 | * errors; if that happens the user can try the old scheme by adjusting the | |
118 | * following module parameters. | |
119 | * | |
120 | * For maximum flexibility there are two boolean parameters to control the | |
121 | * hub driver's behavior. On the first initialization attempt, if the | |
122 | * "old_scheme_first" parameter is set then the old scheme will be used, | |
123 | * otherwise the new scheme is used. If that fails and "use_both_schemes" | |
124 | * is set, then the driver will make another attempt, using the other scheme. | |
125 | */ | |
126 | static int old_scheme_first = 0; | |
127 | module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); | |
128 | MODULE_PARM_DESC(old_scheme_first, | |
129 | "start with the old device initialization scheme"); | |
130 | ||
131 | static int use_both_schemes = 1; | |
132 | module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); | |
133 | MODULE_PARM_DESC(use_both_schemes, | |
134 | "try the other device initialization scheme if the " | |
135 | "first one fails"); | |
136 | ||
32fe0198 AS |
137 | /* Mutual exclusion for EHCI CF initialization. This interferes with |
138 | * port reset on some companion controllers. | |
139 | */ | |
140 | DECLARE_RWSEM(ehci_cf_port_reset_rwsem); | |
141 | EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); | |
142 | ||
948fea37 AS |
143 | #define HUB_DEBOUNCE_TIMEOUT 1500 |
144 | #define HUB_DEBOUNCE_STEP 25 | |
145 | #define HUB_DEBOUNCE_STABLE 100 | |
146 | ||
1da177e4 | 147 | |
742120c6 ML |
148 | static int usb_reset_and_verify_device(struct usb_device *udev); |
149 | ||
404d5b18 | 150 | static inline char *portspeed(int portstatus) |
1da177e4 LT |
151 | { |
152 | if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED)) | |
153 | return "480 Mb/s"; | |
154 | else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED)) | |
155 | return "1.5 Mb/s"; | |
156 | else | |
157 | return "12 Mb/s"; | |
158 | } | |
1da177e4 LT |
159 | |
160 | /* Note that hdev or one of its children must be locked! */ | |
161 | static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev) | |
162 | { | |
163 | return usb_get_intfdata(hdev->actconfig->interface[0]); | |
164 | } | |
165 | ||
166 | /* USB 2.0 spec Section 11.24.4.5 */ | |
167 | static int get_hub_descriptor(struct usb_device *hdev, void *data, int size) | |
168 | { | |
169 | int i, ret; | |
170 | ||
171 | for (i = 0; i < 3; i++) { | |
172 | ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
173 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, | |
174 | USB_DT_HUB << 8, 0, data, size, | |
175 | USB_CTRL_GET_TIMEOUT); | |
176 | if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) | |
177 | return ret; | |
178 | } | |
179 | return -EINVAL; | |
180 | } | |
181 | ||
182 | /* | |
183 | * USB 2.0 spec Section 11.24.2.1 | |
184 | */ | |
185 | static int clear_hub_feature(struct usb_device *hdev, int feature) | |
186 | { | |
187 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
188 | USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); | |
189 | } | |
190 | ||
191 | /* | |
192 | * USB 2.0 spec Section 11.24.2.2 | |
193 | */ | |
194 | static int clear_port_feature(struct usb_device *hdev, int port1, int feature) | |
195 | { | |
196 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
197 | USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, | |
198 | NULL, 0, 1000); | |
199 | } | |
200 | ||
201 | /* | |
202 | * USB 2.0 spec Section 11.24.2.13 | |
203 | */ | |
204 | static int set_port_feature(struct usb_device *hdev, int port1, int feature) | |
205 | { | |
206 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
207 | USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, | |
208 | NULL, 0, 1000); | |
209 | } | |
210 | ||
211 | /* | |
212 | * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 | |
213 | * for info about using port indicators | |
214 | */ | |
215 | static void set_port_led( | |
216 | struct usb_hub *hub, | |
217 | int port1, | |
218 | int selector | |
219 | ) | |
220 | { | |
221 | int status = set_port_feature(hub->hdev, (selector << 8) | port1, | |
222 | USB_PORT_FEAT_INDICATOR); | |
223 | if (status < 0) | |
224 | dev_dbg (hub->intfdev, | |
225 | "port %d indicator %s status %d\n", | |
226 | port1, | |
227 | ({ char *s; switch (selector) { | |
228 | case HUB_LED_AMBER: s = "amber"; break; | |
229 | case HUB_LED_GREEN: s = "green"; break; | |
230 | case HUB_LED_OFF: s = "off"; break; | |
231 | case HUB_LED_AUTO: s = "auto"; break; | |
232 | default: s = "??"; break; | |
233 | }; s; }), | |
234 | status); | |
235 | } | |
236 | ||
237 | #define LED_CYCLE_PERIOD ((2*HZ)/3) | |
238 | ||
c4028958 | 239 | static void led_work (struct work_struct *work) |
1da177e4 | 240 | { |
c4028958 DH |
241 | struct usb_hub *hub = |
242 | container_of(work, struct usb_hub, leds.work); | |
1da177e4 LT |
243 | struct usb_device *hdev = hub->hdev; |
244 | unsigned i; | |
245 | unsigned changed = 0; | |
246 | int cursor = -1; | |
247 | ||
248 | if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) | |
249 | return; | |
250 | ||
251 | for (i = 0; i < hub->descriptor->bNbrPorts; i++) { | |
252 | unsigned selector, mode; | |
253 | ||
254 | /* 30%-50% duty cycle */ | |
255 | ||
256 | switch (hub->indicator[i]) { | |
257 | /* cycle marker */ | |
258 | case INDICATOR_CYCLE: | |
259 | cursor = i; | |
260 | selector = HUB_LED_AUTO; | |
261 | mode = INDICATOR_AUTO; | |
262 | break; | |
263 | /* blinking green = sw attention */ | |
264 | case INDICATOR_GREEN_BLINK: | |
265 | selector = HUB_LED_GREEN; | |
266 | mode = INDICATOR_GREEN_BLINK_OFF; | |
267 | break; | |
268 | case INDICATOR_GREEN_BLINK_OFF: | |
269 | selector = HUB_LED_OFF; | |
270 | mode = INDICATOR_GREEN_BLINK; | |
271 | break; | |
272 | /* blinking amber = hw attention */ | |
273 | case INDICATOR_AMBER_BLINK: | |
274 | selector = HUB_LED_AMBER; | |
275 | mode = INDICATOR_AMBER_BLINK_OFF; | |
276 | break; | |
277 | case INDICATOR_AMBER_BLINK_OFF: | |
278 | selector = HUB_LED_OFF; | |
279 | mode = INDICATOR_AMBER_BLINK; | |
280 | break; | |
281 | /* blink green/amber = reserved */ | |
282 | case INDICATOR_ALT_BLINK: | |
283 | selector = HUB_LED_GREEN; | |
284 | mode = INDICATOR_ALT_BLINK_OFF; | |
285 | break; | |
286 | case INDICATOR_ALT_BLINK_OFF: | |
287 | selector = HUB_LED_AMBER; | |
288 | mode = INDICATOR_ALT_BLINK; | |
289 | break; | |
290 | default: | |
291 | continue; | |
292 | } | |
293 | if (selector != HUB_LED_AUTO) | |
294 | changed = 1; | |
295 | set_port_led(hub, i + 1, selector); | |
296 | hub->indicator[i] = mode; | |
297 | } | |
298 | if (!changed && blinkenlights) { | |
299 | cursor++; | |
300 | cursor %= hub->descriptor->bNbrPorts; | |
301 | set_port_led(hub, cursor + 1, HUB_LED_GREEN); | |
302 | hub->indicator[cursor] = INDICATOR_CYCLE; | |
303 | changed++; | |
304 | } | |
305 | if (changed) | |
306 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); | |
307 | } | |
308 | ||
309 | /* use a short timeout for hub/port status fetches */ | |
310 | #define USB_STS_TIMEOUT 1000 | |
311 | #define USB_STS_RETRIES 5 | |
312 | ||
313 | /* | |
314 | * USB 2.0 spec Section 11.24.2.6 | |
315 | */ | |
316 | static int get_hub_status(struct usb_device *hdev, | |
317 | struct usb_hub_status *data) | |
318 | { | |
319 | int i, status = -ETIMEDOUT; | |
320 | ||
321 | for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { | |
322 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
323 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, | |
324 | data, sizeof(*data), USB_STS_TIMEOUT); | |
325 | } | |
326 | return status; | |
327 | } | |
328 | ||
329 | /* | |
330 | * USB 2.0 spec Section 11.24.2.7 | |
331 | */ | |
332 | static int get_port_status(struct usb_device *hdev, int port1, | |
333 | struct usb_port_status *data) | |
334 | { | |
335 | int i, status = -ETIMEDOUT; | |
336 | ||
337 | for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { | |
338 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
339 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, | |
340 | data, sizeof(*data), USB_STS_TIMEOUT); | |
341 | } | |
342 | return status; | |
343 | } | |
344 | ||
3eb14915 AS |
345 | static int hub_port_status(struct usb_hub *hub, int port1, |
346 | u16 *status, u16 *change) | |
347 | { | |
348 | int ret; | |
349 | ||
350 | mutex_lock(&hub->status_mutex); | |
351 | ret = get_port_status(hub->hdev, port1, &hub->status->port); | |
352 | if (ret < 4) { | |
353 | dev_err(hub->intfdev, | |
354 | "%s failed (err = %d)\n", __func__, ret); | |
355 | if (ret >= 0) | |
356 | ret = -EIO; | |
357 | } else { | |
358 | *status = le16_to_cpu(hub->status->port.wPortStatus); | |
359 | *change = le16_to_cpu(hub->status->port.wPortChange); | |
360 | ret = 0; | |
361 | } | |
362 | mutex_unlock(&hub->status_mutex); | |
363 | return ret; | |
364 | } | |
365 | ||
1da177e4 LT |
366 | static void kick_khubd(struct usb_hub *hub) |
367 | { | |
368 | unsigned long flags; | |
369 | ||
40f122f3 AS |
370 | /* Suppress autosuspend until khubd runs */ |
371 | to_usb_interface(hub->intfdev)->pm_usage_cnt = 1; | |
372 | ||
1da177e4 | 373 | spin_lock_irqsave(&hub_event_lock, flags); |
2e2c5eea | 374 | if (!hub->disconnected && list_empty(&hub->event_list)) { |
1da177e4 LT |
375 | list_add_tail(&hub->event_list, &hub_event_list); |
376 | wake_up(&khubd_wait); | |
377 | } | |
378 | spin_unlock_irqrestore(&hub_event_lock, flags); | |
379 | } | |
380 | ||
381 | void usb_kick_khubd(struct usb_device *hdev) | |
382 | { | |
e8054854 | 383 | /* FIXME: What if hdev isn't bound to the hub driver? */ |
1da177e4 LT |
384 | kick_khubd(hdev_to_hub(hdev)); |
385 | } | |
386 | ||
387 | ||
388 | /* completion function, fires on port status changes and various faults */ | |
7d12e780 | 389 | static void hub_irq(struct urb *urb) |
1da177e4 | 390 | { |
ec17cf1c | 391 | struct usb_hub *hub = urb->context; |
e015268d | 392 | int status = urb->status; |
1da177e4 LT |
393 | int i; |
394 | unsigned long bits; | |
395 | ||
e015268d | 396 | switch (status) { |
1da177e4 LT |
397 | case -ENOENT: /* synchronous unlink */ |
398 | case -ECONNRESET: /* async unlink */ | |
399 | case -ESHUTDOWN: /* hardware going away */ | |
400 | return; | |
401 | ||
402 | default: /* presumably an error */ | |
403 | /* Cause a hub reset after 10 consecutive errors */ | |
e015268d | 404 | dev_dbg (hub->intfdev, "transfer --> %d\n", status); |
1da177e4 LT |
405 | if ((++hub->nerrors < 10) || hub->error) |
406 | goto resubmit; | |
e015268d | 407 | hub->error = status; |
1da177e4 | 408 | /* FALL THROUGH */ |
ec17cf1c | 409 | |
1da177e4 LT |
410 | /* let khubd handle things */ |
411 | case 0: /* we got data: port status changed */ | |
412 | bits = 0; | |
413 | for (i = 0; i < urb->actual_length; ++i) | |
414 | bits |= ((unsigned long) ((*hub->buffer)[i])) | |
415 | << (i*8); | |
416 | hub->event_bits[0] = bits; | |
417 | break; | |
418 | } | |
419 | ||
420 | hub->nerrors = 0; | |
421 | ||
422 | /* Something happened, let khubd figure it out */ | |
423 | kick_khubd(hub); | |
424 | ||
425 | resubmit: | |
426 | if (hub->quiescing) | |
427 | return; | |
428 | ||
429 | if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 | |
430 | && status != -ENODEV && status != -EPERM) | |
431 | dev_err (hub->intfdev, "resubmit --> %d\n", status); | |
432 | } | |
433 | ||
434 | /* USB 2.0 spec Section 11.24.2.3 */ | |
435 | static inline int | |
436 | hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) | |
437 | { | |
438 | return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
439 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, | |
440 | tt, NULL, 0, 1000); | |
441 | } | |
442 | ||
443 | /* | |
444 | * enumeration blocks khubd for a long time. we use keventd instead, since | |
445 | * long blocking there is the exception, not the rule. accordingly, HCDs | |
446 | * talking to TTs must queue control transfers (not just bulk and iso), so | |
447 | * both can talk to the same hub concurrently. | |
448 | */ | |
c4028958 | 449 | static void hub_tt_kevent (struct work_struct *work) |
1da177e4 | 450 | { |
c4028958 DH |
451 | struct usb_hub *hub = |
452 | container_of(work, struct usb_hub, tt.kevent); | |
1da177e4 | 453 | unsigned long flags; |
55e5fdfa | 454 | int limit = 100; |
1da177e4 LT |
455 | |
456 | spin_lock_irqsave (&hub->tt.lock, flags); | |
55e5fdfa | 457 | while (--limit && !list_empty (&hub->tt.clear_list)) { |
1da177e4 LT |
458 | struct list_head *temp; |
459 | struct usb_tt_clear *clear; | |
460 | struct usb_device *hdev = hub->hdev; | |
461 | int status; | |
462 | ||
463 | temp = hub->tt.clear_list.next; | |
464 | clear = list_entry (temp, struct usb_tt_clear, clear_list); | |
465 | list_del (&clear->clear_list); | |
466 | ||
467 | /* drop lock so HCD can concurrently report other TT errors */ | |
468 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
469 | status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); | |
470 | spin_lock_irqsave (&hub->tt.lock, flags); | |
471 | ||
472 | if (status) | |
473 | dev_err (&hdev->dev, | |
474 | "clear tt %d (%04x) error %d\n", | |
475 | clear->tt, clear->devinfo, status); | |
1bc3c9e1 | 476 | kfree(clear); |
1da177e4 LT |
477 | } |
478 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
479 | } | |
480 | ||
481 | /** | |
482 | * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub | |
483 | * @udev: the device whose split transaction failed | |
484 | * @pipe: identifies the endpoint of the failed transaction | |
485 | * | |
486 | * High speed HCDs use this to tell the hub driver that some split control or | |
487 | * bulk transaction failed in a way that requires clearing internal state of | |
488 | * a transaction translator. This is normally detected (and reported) from | |
489 | * interrupt context. | |
490 | * | |
491 | * It may not be possible for that hub to handle additional full (or low) | |
492 | * speed transactions until that state is fully cleared out. | |
493 | */ | |
494 | void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe) | |
495 | { | |
496 | struct usb_tt *tt = udev->tt; | |
497 | unsigned long flags; | |
498 | struct usb_tt_clear *clear; | |
499 | ||
500 | /* we've got to cope with an arbitrary number of pending TT clears, | |
501 | * since each TT has "at least two" buffers that can need it (and | |
502 | * there can be many TTs per hub). even if they're uncommon. | |
503 | */ | |
54e6ecb2 | 504 | if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { |
1da177e4 LT |
505 | dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); |
506 | /* FIXME recover somehow ... RESET_TT? */ | |
507 | return; | |
508 | } | |
509 | ||
510 | /* info that CLEAR_TT_BUFFER needs */ | |
511 | clear->tt = tt->multi ? udev->ttport : 1; | |
512 | clear->devinfo = usb_pipeendpoint (pipe); | |
513 | clear->devinfo |= udev->devnum << 4; | |
514 | clear->devinfo |= usb_pipecontrol (pipe) | |
515 | ? (USB_ENDPOINT_XFER_CONTROL << 11) | |
516 | : (USB_ENDPOINT_XFER_BULK << 11); | |
517 | if (usb_pipein (pipe)) | |
518 | clear->devinfo |= 1 << 15; | |
519 | ||
520 | /* tell keventd to clear state for this TT */ | |
521 | spin_lock_irqsave (&tt->lock, flags); | |
522 | list_add_tail (&clear->clear_list, &tt->clear_list); | |
523 | schedule_work (&tt->kevent); | |
524 | spin_unlock_irqrestore (&tt->lock, flags); | |
525 | } | |
782e70c6 | 526 | EXPORT_SYMBOL_GPL(usb_hub_tt_clear_buffer); |
1da177e4 | 527 | |
8520f380 AS |
528 | /* If do_delay is false, return the number of milliseconds the caller |
529 | * needs to delay. | |
530 | */ | |
531 | static unsigned hub_power_on(struct usb_hub *hub, bool do_delay) | |
1da177e4 LT |
532 | { |
533 | int port1; | |
b789696a | 534 | unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; |
8520f380 | 535 | unsigned delay; |
4489a571 AS |
536 | u16 wHubCharacteristics = |
537 | le16_to_cpu(hub->descriptor->wHubCharacteristics); | |
538 | ||
539 | /* Enable power on each port. Some hubs have reserved values | |
540 | * of LPSM (> 2) in their descriptors, even though they are | |
541 | * USB 2.0 hubs. Some hubs do not implement port-power switching | |
542 | * but only emulate it. In all cases, the ports won't work | |
543 | * unless we send these messages to the hub. | |
544 | */ | |
545 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) | |
1da177e4 | 546 | dev_dbg(hub->intfdev, "enabling power on all ports\n"); |
4489a571 AS |
547 | else |
548 | dev_dbg(hub->intfdev, "trying to enable port power on " | |
549 | "non-switchable hub\n"); | |
550 | for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) | |
551 | set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); | |
1da177e4 | 552 | |
b789696a | 553 | /* Wait at least 100 msec for power to become stable */ |
8520f380 AS |
554 | delay = max(pgood_delay, (unsigned) 100); |
555 | if (do_delay) | |
556 | msleep(delay); | |
557 | return delay; | |
1da177e4 LT |
558 | } |
559 | ||
1da177e4 LT |
560 | static int hub_hub_status(struct usb_hub *hub, |
561 | u16 *status, u16 *change) | |
562 | { | |
563 | int ret; | |
564 | ||
db90e7a1 | 565 | mutex_lock(&hub->status_mutex); |
1da177e4 LT |
566 | ret = get_hub_status(hub->hdev, &hub->status->hub); |
567 | if (ret < 0) | |
568 | dev_err (hub->intfdev, | |
441b62c1 | 569 | "%s failed (err = %d)\n", __func__, ret); |
1da177e4 LT |
570 | else { |
571 | *status = le16_to_cpu(hub->status->hub.wHubStatus); | |
572 | *change = le16_to_cpu(hub->status->hub.wHubChange); | |
573 | ret = 0; | |
574 | } | |
db90e7a1 | 575 | mutex_unlock(&hub->status_mutex); |
1da177e4 LT |
576 | return ret; |
577 | } | |
578 | ||
8b28c752 AS |
579 | static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) |
580 | { | |
581 | struct usb_device *hdev = hub->hdev; | |
0458d5b4 | 582 | int ret = 0; |
8b28c752 | 583 | |
0458d5b4 | 584 | if (hdev->children[port1-1] && set_state) |
8b28c752 AS |
585 | usb_set_device_state(hdev->children[port1-1], |
586 | USB_STATE_NOTATTACHED); | |
0458d5b4 AS |
587 | if (!hub->error) |
588 | ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); | |
8b28c752 AS |
589 | if (ret) |
590 | dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", | |
0458d5b4 | 591 | port1, ret); |
8b28c752 AS |
592 | return ret; |
593 | } | |
594 | ||
0458d5b4 AS |
595 | /* |
596 | * Disable a port and mark a logical connnect-change event, so that some | |
597 | * time later khubd will disconnect() any existing usb_device on the port | |
598 | * and will re-enumerate if there actually is a device attached. | |
599 | */ | |
600 | static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) | |
601 | { | |
602 | dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); | |
603 | hub_port_disable(hub, port1, 1); | |
7d069b7d | 604 | |
0458d5b4 AS |
605 | /* FIXME let caller ask to power down the port: |
606 | * - some devices won't enumerate without a VBUS power cycle | |
607 | * - SRP saves power that way | |
608 | * - ... new call, TBD ... | |
609 | * That's easy if this hub can switch power per-port, and | |
610 | * khubd reactivates the port later (timer, SRP, etc). | |
611 | * Powerdown must be optional, because of reset/DFU. | |
612 | */ | |
613 | ||
614 | set_bit(port1, hub->change_bits); | |
615 | kick_khubd(hub); | |
616 | } | |
617 | ||
6ee0b270 | 618 | enum hub_activation_type { |
8520f380 AS |
619 | HUB_INIT, HUB_INIT2, HUB_INIT3, |
620 | HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, | |
6ee0b270 | 621 | }; |
5e6effae | 622 | |
8520f380 AS |
623 | static void hub_init_func2(struct work_struct *ws); |
624 | static void hub_init_func3(struct work_struct *ws); | |
625 | ||
f2835219 | 626 | static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) |
5e6effae AS |
627 | { |
628 | struct usb_device *hdev = hub->hdev; | |
629 | int port1; | |
f2835219 | 630 | int status; |
948fea37 | 631 | bool need_debounce_delay = false; |
8520f380 AS |
632 | unsigned delay; |
633 | ||
634 | /* Continue a partial initialization */ | |
635 | if (type == HUB_INIT2) | |
636 | goto init2; | |
637 | if (type == HUB_INIT3) | |
638 | goto init3; | |
5e6effae | 639 | |
f2835219 AS |
640 | /* After a resume, port power should still be on. |
641 | * For any other type of activation, turn it on. | |
642 | */ | |
8520f380 AS |
643 | if (type != HUB_RESUME) { |
644 | ||
645 | /* Speed up system boot by using a delayed_work for the | |
646 | * hub's initial power-up delays. This is pretty awkward | |
647 | * and the implementation looks like a home-brewed sort of | |
648 | * setjmp/longjmp, but it saves at least 100 ms for each | |
649 | * root hub (assuming usbcore is compiled into the kernel | |
650 | * rather than as a module). It adds up. | |
651 | * | |
652 | * This can't be done for HUB_RESUME or HUB_RESET_RESUME | |
653 | * because for those activation types the ports have to be | |
654 | * operational when we return. In theory this could be done | |
655 | * for HUB_POST_RESET, but it's easier not to. | |
656 | */ | |
657 | if (type == HUB_INIT) { | |
658 | delay = hub_power_on(hub, false); | |
659 | PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2); | |
660 | schedule_delayed_work(&hub->init_work, | |
661 | msecs_to_jiffies(delay)); | |
662 | return; /* Continues at init2: below */ | |
663 | } else { | |
664 | hub_power_on(hub, true); | |
665 | } | |
666 | } | |
667 | init2: | |
f2835219 | 668 | |
6ee0b270 AS |
669 | /* Check each port and set hub->change_bits to let khubd know |
670 | * which ports need attention. | |
5e6effae AS |
671 | */ |
672 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
673 | struct usb_device *udev = hdev->children[port1-1]; | |
5e6effae AS |
674 | u16 portstatus, portchange; |
675 | ||
6ee0b270 AS |
676 | portstatus = portchange = 0; |
677 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
678 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) | |
679 | dev_dbg(hub->intfdev, | |
680 | "port %d: status %04x change %04x\n", | |
681 | port1, portstatus, portchange); | |
682 | ||
683 | /* After anything other than HUB_RESUME (i.e., initialization | |
684 | * or any sort of reset), every port should be disabled. | |
685 | * Unconnected ports should likewise be disabled (paranoia), | |
686 | * and so should ports for which we have no usb_device. | |
687 | */ | |
688 | if ((portstatus & USB_PORT_STAT_ENABLE) && ( | |
689 | type != HUB_RESUME || | |
690 | !(portstatus & USB_PORT_STAT_CONNECTION) || | |
691 | !udev || | |
692 | udev->state == USB_STATE_NOTATTACHED)) { | |
693 | clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); | |
694 | portstatus &= ~USB_PORT_STAT_ENABLE; | |
5e6effae AS |
695 | } |
696 | ||
948fea37 AS |
697 | /* Clear status-change flags; we'll debounce later */ |
698 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
699 | need_debounce_delay = true; | |
700 | clear_port_feature(hub->hdev, port1, | |
701 | USB_PORT_FEAT_C_CONNECTION); | |
702 | } | |
703 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
704 | need_debounce_delay = true; | |
705 | clear_port_feature(hub->hdev, port1, | |
706 | USB_PORT_FEAT_C_ENABLE); | |
707 | } | |
708 | ||
6ee0b270 AS |
709 | if (!udev || udev->state == USB_STATE_NOTATTACHED) { |
710 | /* Tell khubd to disconnect the device or | |
711 | * check for a new connection | |
712 | */ | |
713 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) | |
714 | set_bit(port1, hub->change_bits); | |
715 | ||
716 | } else if (portstatus & USB_PORT_STAT_ENABLE) { | |
717 | /* The power session apparently survived the resume. | |
718 | * If there was an overcurrent or suspend change | |
719 | * (i.e., remote wakeup request), have khubd | |
720 | * take care of it. | |
721 | */ | |
722 | if (portchange) | |
723 | set_bit(port1, hub->change_bits); | |
5e6effae | 724 | |
6ee0b270 | 725 | } else if (udev->persist_enabled) { |
6ee0b270 | 726 | #ifdef CONFIG_PM |
5e6effae | 727 | udev->reset_resume = 1; |
6ee0b270 | 728 | #endif |
8808f00c AS |
729 | set_bit(port1, hub->change_bits); |
730 | ||
6ee0b270 AS |
731 | } else { |
732 | /* The power session is gone; tell khubd */ | |
733 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
734 | set_bit(port1, hub->change_bits); | |
5e6effae | 735 | } |
5e6effae AS |
736 | } |
737 | ||
948fea37 AS |
738 | /* If no port-status-change flags were set, we don't need any |
739 | * debouncing. If flags were set we can try to debounce the | |
740 | * ports all at once right now, instead of letting khubd do them | |
741 | * one at a time later on. | |
742 | * | |
743 | * If any port-status changes do occur during this delay, khubd | |
744 | * will see them later and handle them normally. | |
745 | */ | |
8520f380 AS |
746 | if (need_debounce_delay) { |
747 | delay = HUB_DEBOUNCE_STABLE; | |
748 | ||
749 | /* Don't do a long sleep inside a workqueue routine */ | |
750 | if (type == HUB_INIT2) { | |
751 | PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3); | |
752 | schedule_delayed_work(&hub->init_work, | |
753 | msecs_to_jiffies(delay)); | |
754 | return; /* Continues at init3: below */ | |
755 | } else { | |
756 | msleep(delay); | |
757 | } | |
758 | } | |
759 | init3: | |
f2835219 AS |
760 | hub->quiescing = 0; |
761 | ||
762 | status = usb_submit_urb(hub->urb, GFP_NOIO); | |
763 | if (status < 0) | |
764 | dev_err(hub->intfdev, "activate --> %d\n", status); | |
765 | if (hub->has_indicators && blinkenlights) | |
766 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); | |
767 | ||
768 | /* Scan all ports that need attention */ | |
769 | kick_khubd(hub); | |
5e6effae AS |
770 | } |
771 | ||
8520f380 AS |
772 | /* Implement the continuations for the delays above */ |
773 | static void hub_init_func2(struct work_struct *ws) | |
774 | { | |
775 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
776 | ||
777 | hub_activate(hub, HUB_INIT2); | |
778 | } | |
779 | ||
780 | static void hub_init_func3(struct work_struct *ws) | |
781 | { | |
782 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
783 | ||
784 | hub_activate(hub, HUB_INIT3); | |
785 | } | |
786 | ||
4330354f AS |
787 | enum hub_quiescing_type { |
788 | HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND | |
789 | }; | |
790 | ||
791 | static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) | |
792 | { | |
793 | struct usb_device *hdev = hub->hdev; | |
794 | int i; | |
795 | ||
8520f380 AS |
796 | cancel_delayed_work_sync(&hub->init_work); |
797 | ||
4330354f AS |
798 | /* khubd and related activity won't re-trigger */ |
799 | hub->quiescing = 1; | |
800 | ||
801 | if (type != HUB_SUSPEND) { | |
802 | /* Disconnect all the children */ | |
803 | for (i = 0; i < hdev->maxchild; ++i) { | |
804 | if (hdev->children[i]) | |
805 | usb_disconnect(&hdev->children[i]); | |
806 | } | |
807 | } | |
808 | ||
809 | /* Stop khubd and related activity */ | |
810 | usb_kill_urb(hub->urb); | |
811 | if (hub->has_indicators) | |
812 | cancel_delayed_work_sync(&hub->leds); | |
813 | if (hub->tt.hub) | |
814 | cancel_work_sync(&hub->tt.kevent); | |
815 | } | |
816 | ||
3eb14915 AS |
817 | /* caller has locked the hub device */ |
818 | static int hub_pre_reset(struct usb_interface *intf) | |
819 | { | |
820 | struct usb_hub *hub = usb_get_intfdata(intf); | |
821 | ||
4330354f | 822 | hub_quiesce(hub, HUB_PRE_RESET); |
f07600cf | 823 | return 0; |
7d069b7d AS |
824 | } |
825 | ||
826 | /* caller has locked the hub device */ | |
f07600cf | 827 | static int hub_post_reset(struct usb_interface *intf) |
7d069b7d | 828 | { |
7de18d8b AS |
829 | struct usb_hub *hub = usb_get_intfdata(intf); |
830 | ||
f2835219 | 831 | hub_activate(hub, HUB_POST_RESET); |
f07600cf | 832 | return 0; |
7d069b7d AS |
833 | } |
834 | ||
1da177e4 LT |
835 | static int hub_configure(struct usb_hub *hub, |
836 | struct usb_endpoint_descriptor *endpoint) | |
837 | { | |
838 | struct usb_device *hdev = hub->hdev; | |
839 | struct device *hub_dev = hub->intfdev; | |
840 | u16 hubstatus, hubchange; | |
74ad9bd2 | 841 | u16 wHubCharacteristics; |
1da177e4 LT |
842 | unsigned int pipe; |
843 | int maxp, ret; | |
844 | char *message; | |
845 | ||
846 | hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL, | |
847 | &hub->buffer_dma); | |
848 | if (!hub->buffer) { | |
849 | message = "can't allocate hub irq buffer"; | |
850 | ret = -ENOMEM; | |
851 | goto fail; | |
852 | } | |
853 | ||
854 | hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); | |
855 | if (!hub->status) { | |
856 | message = "can't kmalloc hub status buffer"; | |
857 | ret = -ENOMEM; | |
858 | goto fail; | |
859 | } | |
db90e7a1 | 860 | mutex_init(&hub->status_mutex); |
1da177e4 LT |
861 | |
862 | hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); | |
863 | if (!hub->descriptor) { | |
864 | message = "can't kmalloc hub descriptor"; | |
865 | ret = -ENOMEM; | |
866 | goto fail; | |
867 | } | |
868 | ||
869 | /* Request the entire hub descriptor. | |
870 | * hub->descriptor can handle USB_MAXCHILDREN ports, | |
871 | * but the hub can/will return fewer bytes here. | |
872 | */ | |
873 | ret = get_hub_descriptor(hdev, hub->descriptor, | |
874 | sizeof(*hub->descriptor)); | |
875 | if (ret < 0) { | |
876 | message = "can't read hub descriptor"; | |
877 | goto fail; | |
878 | } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { | |
879 | message = "hub has too many ports!"; | |
880 | ret = -ENODEV; | |
881 | goto fail; | |
882 | } | |
883 | ||
884 | hdev->maxchild = hub->descriptor->bNbrPorts; | |
885 | dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, | |
886 | (hdev->maxchild == 1) ? "" : "s"); | |
887 | ||
74ad9bd2 | 888 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
1da177e4 | 889 | |
74ad9bd2 | 890 | if (wHubCharacteristics & HUB_CHAR_COMPOUND) { |
1da177e4 LT |
891 | int i; |
892 | char portstr [USB_MAXCHILDREN + 1]; | |
893 | ||
894 | for (i = 0; i < hdev->maxchild; i++) | |
895 | portstr[i] = hub->descriptor->DeviceRemovable | |
896 | [((i + 1) / 8)] & (1 << ((i + 1) % 8)) | |
897 | ? 'F' : 'R'; | |
898 | portstr[hdev->maxchild] = 0; | |
899 | dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); | |
900 | } else | |
901 | dev_dbg(hub_dev, "standalone hub\n"); | |
902 | ||
74ad9bd2 | 903 | switch (wHubCharacteristics & HUB_CHAR_LPSM) { |
1da177e4 LT |
904 | case 0x00: |
905 | dev_dbg(hub_dev, "ganged power switching\n"); | |
906 | break; | |
907 | case 0x01: | |
908 | dev_dbg(hub_dev, "individual port power switching\n"); | |
909 | break; | |
910 | case 0x02: | |
911 | case 0x03: | |
912 | dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); | |
913 | break; | |
914 | } | |
915 | ||
74ad9bd2 | 916 | switch (wHubCharacteristics & HUB_CHAR_OCPM) { |
1da177e4 LT |
917 | case 0x00: |
918 | dev_dbg(hub_dev, "global over-current protection\n"); | |
919 | break; | |
920 | case 0x08: | |
921 | dev_dbg(hub_dev, "individual port over-current protection\n"); | |
922 | break; | |
923 | case 0x10: | |
924 | case 0x18: | |
925 | dev_dbg(hub_dev, "no over-current protection\n"); | |
926 | break; | |
927 | } | |
928 | ||
929 | spin_lock_init (&hub->tt.lock); | |
930 | INIT_LIST_HEAD (&hub->tt.clear_list); | |
c4028958 | 931 | INIT_WORK (&hub->tt.kevent, hub_tt_kevent); |
1da177e4 LT |
932 | switch (hdev->descriptor.bDeviceProtocol) { |
933 | case 0: | |
934 | break; | |
935 | case 1: | |
936 | dev_dbg(hub_dev, "Single TT\n"); | |
937 | hub->tt.hub = hdev; | |
938 | break; | |
939 | case 2: | |
940 | ret = usb_set_interface(hdev, 0, 1); | |
941 | if (ret == 0) { | |
942 | dev_dbg(hub_dev, "TT per port\n"); | |
943 | hub->tt.multi = 1; | |
944 | } else | |
945 | dev_err(hub_dev, "Using single TT (err %d)\n", | |
946 | ret); | |
947 | hub->tt.hub = hdev; | |
948 | break; | |
949 | default: | |
950 | dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", | |
951 | hdev->descriptor.bDeviceProtocol); | |
952 | break; | |
953 | } | |
954 | ||
e09711ae | 955 | /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ |
74ad9bd2 | 956 | switch (wHubCharacteristics & HUB_CHAR_TTTT) { |
e09711ae | 957 | case HUB_TTTT_8_BITS: |
958 | if (hdev->descriptor.bDeviceProtocol != 0) { | |
959 | hub->tt.think_time = 666; | |
960 | dev_dbg(hub_dev, "TT requires at most %d " | |
961 | "FS bit times (%d ns)\n", | |
962 | 8, hub->tt.think_time); | |
963 | } | |
1da177e4 | 964 | break; |
e09711ae | 965 | case HUB_TTTT_16_BITS: |
966 | hub->tt.think_time = 666 * 2; | |
967 | dev_dbg(hub_dev, "TT requires at most %d " | |
968 | "FS bit times (%d ns)\n", | |
969 | 16, hub->tt.think_time); | |
1da177e4 | 970 | break; |
e09711ae | 971 | case HUB_TTTT_24_BITS: |
972 | hub->tt.think_time = 666 * 3; | |
973 | dev_dbg(hub_dev, "TT requires at most %d " | |
974 | "FS bit times (%d ns)\n", | |
975 | 24, hub->tt.think_time); | |
1da177e4 | 976 | break; |
e09711ae | 977 | case HUB_TTTT_32_BITS: |
978 | hub->tt.think_time = 666 * 4; | |
979 | dev_dbg(hub_dev, "TT requires at most %d " | |
980 | "FS bit times (%d ns)\n", | |
981 | 32, hub->tt.think_time); | |
1da177e4 LT |
982 | break; |
983 | } | |
984 | ||
985 | /* probe() zeroes hub->indicator[] */ | |
74ad9bd2 | 986 | if (wHubCharacteristics & HUB_CHAR_PORTIND) { |
1da177e4 LT |
987 | hub->has_indicators = 1; |
988 | dev_dbg(hub_dev, "Port indicators are supported\n"); | |
989 | } | |
990 | ||
991 | dev_dbg(hub_dev, "power on to power good time: %dms\n", | |
992 | hub->descriptor->bPwrOn2PwrGood * 2); | |
993 | ||
994 | /* power budgeting mostly matters with bus-powered hubs, | |
995 | * and battery-powered root hubs (may provide just 8 mA). | |
996 | */ | |
997 | ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); | |
55c52718 | 998 | if (ret < 2) { |
1da177e4 LT |
999 | message = "can't get hub status"; |
1000 | goto fail; | |
1001 | } | |
7d35b929 AS |
1002 | le16_to_cpus(&hubstatus); |
1003 | if (hdev == hdev->bus->root_hub) { | |
55c52718 AS |
1004 | if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) |
1005 | hub->mA_per_port = 500; | |
1006 | else { | |
1007 | hub->mA_per_port = hdev->bus_mA; | |
1008 | hub->limited_power = 1; | |
1009 | } | |
7d35b929 | 1010 | } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
1da177e4 LT |
1011 | dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", |
1012 | hub->descriptor->bHubContrCurrent); | |
55c52718 AS |
1013 | hub->limited_power = 1; |
1014 | if (hdev->maxchild > 0) { | |
1015 | int remaining = hdev->bus_mA - | |
1016 | hub->descriptor->bHubContrCurrent; | |
1017 | ||
1018 | if (remaining < hdev->maxchild * 100) | |
1019 | dev_warn(hub_dev, | |
1020 | "insufficient power available " | |
1021 | "to use all downstream ports\n"); | |
1022 | hub->mA_per_port = 100; /* 7.2.1.1 */ | |
1023 | } | |
1024 | } else { /* Self-powered external hub */ | |
1025 | /* FIXME: What about battery-powered external hubs that | |
1026 | * provide less current per port? */ | |
1027 | hub->mA_per_port = 500; | |
7d35b929 | 1028 | } |
55c52718 AS |
1029 | if (hub->mA_per_port < 500) |
1030 | dev_dbg(hub_dev, "%umA bus power budget for each child\n", | |
1031 | hub->mA_per_port); | |
1da177e4 LT |
1032 | |
1033 | ret = hub_hub_status(hub, &hubstatus, &hubchange); | |
1034 | if (ret < 0) { | |
1035 | message = "can't get hub status"; | |
1036 | goto fail; | |
1037 | } | |
1038 | ||
1039 | /* local power status reports aren't always correct */ | |
1040 | if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) | |
1041 | dev_dbg(hub_dev, "local power source is %s\n", | |
1042 | (hubstatus & HUB_STATUS_LOCAL_POWER) | |
1043 | ? "lost (inactive)" : "good"); | |
1044 | ||
74ad9bd2 | 1045 | if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) |
1da177e4 LT |
1046 | dev_dbg(hub_dev, "%sover-current condition exists\n", |
1047 | (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); | |
1048 | ||
88fafff9 | 1049 | /* set up the interrupt endpoint |
1050 | * We use the EP's maxpacket size instead of (PORTS+1+7)/8 | |
1051 | * bytes as USB2.0[11.12.3] says because some hubs are known | |
1052 | * to send more data (and thus cause overflow). For root hubs, | |
1053 | * maxpktsize is defined in hcd.c's fake endpoint descriptors | |
1054 | * to be big enough for at least USB_MAXCHILDREN ports. */ | |
1da177e4 LT |
1055 | pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); |
1056 | maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); | |
1057 | ||
1058 | if (maxp > sizeof(*hub->buffer)) | |
1059 | maxp = sizeof(*hub->buffer); | |
1060 | ||
1061 | hub->urb = usb_alloc_urb(0, GFP_KERNEL); | |
1062 | if (!hub->urb) { | |
1063 | message = "couldn't allocate interrupt urb"; | |
1064 | ret = -ENOMEM; | |
1065 | goto fail; | |
1066 | } | |
1067 | ||
1068 | usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, | |
1069 | hub, endpoint->bInterval); | |
1070 | hub->urb->transfer_dma = hub->buffer_dma; | |
1071 | hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
1072 | ||
1073 | /* maybe cycle the hub leds */ | |
1074 | if (hub->has_indicators && blinkenlights) | |
1075 | hub->indicator [0] = INDICATOR_CYCLE; | |
1076 | ||
f2835219 | 1077 | hub_activate(hub, HUB_INIT); |
1da177e4 LT |
1078 | return 0; |
1079 | ||
1080 | fail: | |
1081 | dev_err (hub_dev, "config failed, %s (err %d)\n", | |
1082 | message, ret); | |
1083 | /* hub_disconnect() frees urb and descriptor */ | |
1084 | return ret; | |
1085 | } | |
1086 | ||
e8054854 AS |
1087 | static void hub_release(struct kref *kref) |
1088 | { | |
1089 | struct usb_hub *hub = container_of(kref, struct usb_hub, kref); | |
1090 | ||
1091 | usb_put_intf(to_usb_interface(hub->intfdev)); | |
1092 | kfree(hub); | |
1093 | } | |
1094 | ||
1da177e4 LT |
1095 | static unsigned highspeed_hubs; |
1096 | ||
1097 | static void hub_disconnect(struct usb_interface *intf) | |
1098 | { | |
1099 | struct usb_hub *hub = usb_get_intfdata (intf); | |
e8054854 AS |
1100 | |
1101 | /* Take the hub off the event list and don't let it be added again */ | |
1102 | spin_lock_irq(&hub_event_lock); | |
1103 | list_del_init(&hub->event_list); | |
1104 | hub->disconnected = 1; | |
1105 | spin_unlock_irq(&hub_event_lock); | |
1da177e4 | 1106 | |
7de18d8b AS |
1107 | /* Disconnect all children and quiesce the hub */ |
1108 | hub->error = 0; | |
4330354f | 1109 | hub_quiesce(hub, HUB_DISCONNECT); |
7de18d8b | 1110 | |
8b28c752 | 1111 | usb_set_intfdata (intf, NULL); |
1da177e4 | 1112 | |
e8054854 | 1113 | if (hub->hdev->speed == USB_SPEED_HIGH) |
1da177e4 LT |
1114 | highspeed_hubs--; |
1115 | ||
1da177e4 | 1116 | usb_free_urb(hub->urb); |
1bc3c9e1 | 1117 | kfree(hub->descriptor); |
1bc3c9e1 | 1118 | kfree(hub->status); |
e8054854 AS |
1119 | usb_buffer_free(hub->hdev, sizeof(*hub->buffer), hub->buffer, |
1120 | hub->buffer_dma); | |
1da177e4 | 1121 | |
e8054854 | 1122 | kref_put(&hub->kref, hub_release); |
1da177e4 LT |
1123 | } |
1124 | ||
1125 | static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
1126 | { | |
1127 | struct usb_host_interface *desc; | |
1128 | struct usb_endpoint_descriptor *endpoint; | |
1129 | struct usb_device *hdev; | |
1130 | struct usb_hub *hub; | |
1131 | ||
1132 | desc = intf->cur_altsetting; | |
1133 | hdev = interface_to_usbdev(intf); | |
1134 | ||
38f3ad5e FB |
1135 | if (hdev->level == MAX_TOPO_LEVEL) { |
1136 | dev_err(&intf->dev, "Unsupported bus topology: " | |
1137 | "hub nested too deep\n"); | |
1138 | return -E2BIG; | |
1139 | } | |
1140 | ||
89ccbdc9 DB |
1141 | #ifdef CONFIG_USB_OTG_BLACKLIST_HUB |
1142 | if (hdev->parent) { | |
1143 | dev_warn(&intf->dev, "ignoring external hub\n"); | |
1144 | return -ENODEV; | |
1145 | } | |
1146 | #endif | |
1147 | ||
1da177e4 LT |
1148 | /* Some hubs have a subclass of 1, which AFAICT according to the */ |
1149 | /* specs is not defined, but it works */ | |
1150 | if ((desc->desc.bInterfaceSubClass != 0) && | |
1151 | (desc->desc.bInterfaceSubClass != 1)) { | |
1152 | descriptor_error: | |
1153 | dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); | |
1154 | return -EIO; | |
1155 | } | |
1156 | ||
1157 | /* Multiple endpoints? What kind of mutant ninja-hub is this? */ | |
1158 | if (desc->desc.bNumEndpoints != 1) | |
1159 | goto descriptor_error; | |
1160 | ||
1161 | endpoint = &desc->endpoint[0].desc; | |
1162 | ||
fbf81c29 LFC |
1163 | /* If it's not an interrupt in endpoint, we'd better punt! */ |
1164 | if (!usb_endpoint_is_int_in(endpoint)) | |
1da177e4 LT |
1165 | goto descriptor_error; |
1166 | ||
1167 | /* We found a hub */ | |
1168 | dev_info (&intf->dev, "USB hub found\n"); | |
1169 | ||
0a1ef3b5 | 1170 | hub = kzalloc(sizeof(*hub), GFP_KERNEL); |
1da177e4 LT |
1171 | if (!hub) { |
1172 | dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); | |
1173 | return -ENOMEM; | |
1174 | } | |
1175 | ||
e8054854 | 1176 | kref_init(&hub->kref); |
1da177e4 LT |
1177 | INIT_LIST_HEAD(&hub->event_list); |
1178 | hub->intfdev = &intf->dev; | |
1179 | hub->hdev = hdev; | |
c4028958 | 1180 | INIT_DELAYED_WORK(&hub->leds, led_work); |
8520f380 | 1181 | INIT_DELAYED_WORK(&hub->init_work, NULL); |
e8054854 | 1182 | usb_get_intf(intf); |
1da177e4 LT |
1183 | |
1184 | usb_set_intfdata (intf, hub); | |
40f122f3 | 1185 | intf->needs_remote_wakeup = 1; |
1da177e4 LT |
1186 | |
1187 | if (hdev->speed == USB_SPEED_HIGH) | |
1188 | highspeed_hubs++; | |
1189 | ||
1190 | if (hub_configure(hub, endpoint) >= 0) | |
1191 | return 0; | |
1192 | ||
1193 | hub_disconnect (intf); | |
1194 | return -ENODEV; | |
1195 | } | |
1196 | ||
1197 | static int | |
1198 | hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) | |
1199 | { | |
1200 | struct usb_device *hdev = interface_to_usbdev (intf); | |
1201 | ||
1202 | /* assert ifno == 0 (part of hub spec) */ | |
1203 | switch (code) { | |
1204 | case USBDEVFS_HUB_PORTINFO: { | |
1205 | struct usbdevfs_hub_portinfo *info = user_data; | |
1206 | int i; | |
1207 | ||
1208 | spin_lock_irq(&device_state_lock); | |
1209 | if (hdev->devnum <= 0) | |
1210 | info->nports = 0; | |
1211 | else { | |
1212 | info->nports = hdev->maxchild; | |
1213 | for (i = 0; i < info->nports; i++) { | |
1214 | if (hdev->children[i] == NULL) | |
1215 | info->port[i] = 0; | |
1216 | else | |
1217 | info->port[i] = | |
1218 | hdev->children[i]->devnum; | |
1219 | } | |
1220 | } | |
1221 | spin_unlock_irq(&device_state_lock); | |
1222 | ||
1223 | return info->nports + 1; | |
1224 | } | |
1225 | ||
1226 | default: | |
1227 | return -ENOSYS; | |
1228 | } | |
1229 | } | |
1230 | ||
1da177e4 | 1231 | |
1da177e4 LT |
1232 | static void recursively_mark_NOTATTACHED(struct usb_device *udev) |
1233 | { | |
1234 | int i; | |
1235 | ||
1236 | for (i = 0; i < udev->maxchild; ++i) { | |
1237 | if (udev->children[i]) | |
1238 | recursively_mark_NOTATTACHED(udev->children[i]); | |
1239 | } | |
15123006 | 1240 | if (udev->state == USB_STATE_SUSPENDED) { |
ee49fb5d | 1241 | udev->discon_suspended = 1; |
15123006 SS |
1242 | udev->active_duration -= jiffies; |
1243 | } | |
1da177e4 LT |
1244 | udev->state = USB_STATE_NOTATTACHED; |
1245 | } | |
1246 | ||
1247 | /** | |
1248 | * usb_set_device_state - change a device's current state (usbcore, hcds) | |
1249 | * @udev: pointer to device whose state should be changed | |
1250 | * @new_state: new state value to be stored | |
1251 | * | |
1252 | * udev->state is _not_ fully protected by the device lock. Although | |
1253 | * most transitions are made only while holding the lock, the state can | |
1254 | * can change to USB_STATE_NOTATTACHED at almost any time. This | |
1255 | * is so that devices can be marked as disconnected as soon as possible, | |
1256 | * without having to wait for any semaphores to be released. As a result, | |
1257 | * all changes to any device's state must be protected by the | |
1258 | * device_state_lock spinlock. | |
1259 | * | |
1260 | * Once a device has been added to the device tree, all changes to its state | |
1261 | * should be made using this routine. The state should _not_ be set directly. | |
1262 | * | |
1263 | * If udev->state is already USB_STATE_NOTATTACHED then no change is made. | |
1264 | * Otherwise udev->state is set to new_state, and if new_state is | |
1265 | * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set | |
1266 | * to USB_STATE_NOTATTACHED. | |
1267 | */ | |
1268 | void usb_set_device_state(struct usb_device *udev, | |
1269 | enum usb_device_state new_state) | |
1270 | { | |
1271 | unsigned long flags; | |
1272 | ||
1273 | spin_lock_irqsave(&device_state_lock, flags); | |
1274 | if (udev->state == USB_STATE_NOTATTACHED) | |
1275 | ; /* do nothing */ | |
b94dc6b5 | 1276 | else if (new_state != USB_STATE_NOTATTACHED) { |
fb669cc0 DB |
1277 | |
1278 | /* root hub wakeup capabilities are managed out-of-band | |
1279 | * and may involve silicon errata ... ignore them here. | |
1280 | */ | |
1281 | if (udev->parent) { | |
645daaab AS |
1282 | if (udev->state == USB_STATE_SUSPENDED |
1283 | || new_state == USB_STATE_SUSPENDED) | |
1284 | ; /* No change to wakeup settings */ | |
1285 | else if (new_state == USB_STATE_CONFIGURED) | |
fb669cc0 DB |
1286 | device_init_wakeup(&udev->dev, |
1287 | (udev->actconfig->desc.bmAttributes | |
1288 | & USB_CONFIG_ATT_WAKEUP)); | |
645daaab | 1289 | else |
fb669cc0 DB |
1290 | device_init_wakeup(&udev->dev, 0); |
1291 | } | |
15123006 SS |
1292 | if (udev->state == USB_STATE_SUSPENDED && |
1293 | new_state != USB_STATE_SUSPENDED) | |
1294 | udev->active_duration -= jiffies; | |
1295 | else if (new_state == USB_STATE_SUSPENDED && | |
1296 | udev->state != USB_STATE_SUSPENDED) | |
1297 | udev->active_duration += jiffies; | |
645daaab | 1298 | udev->state = new_state; |
b94dc6b5 | 1299 | } else |
1da177e4 LT |
1300 | recursively_mark_NOTATTACHED(udev); |
1301 | spin_unlock_irqrestore(&device_state_lock, flags); | |
1302 | } | |
1da177e4 | 1303 | |
8af548dc IPG |
1304 | /* |
1305 | * WUSB devices are simple: they have no hubs behind, so the mapping | |
1306 | * device <-> virtual port number becomes 1:1. Why? to simplify the | |
1307 | * life of the device connection logic in | |
1308 | * drivers/usb/wusbcore/devconnect.c. When we do the initial secret | |
1309 | * handshake we need to assign a temporary address in the unauthorized | |
1310 | * space. For simplicity we use the first virtual port number found to | |
1311 | * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] | |
1312 | * and that becomes it's address [X < 128] or its unauthorized address | |
1313 | * [X | 0x80]. | |
1314 | * | |
1315 | * We add 1 as an offset to the one-based USB-stack port number | |
1316 | * (zero-based wusb virtual port index) for two reasons: (a) dev addr | |
1317 | * 0 is reserved by USB for default address; (b) Linux's USB stack | |
1318 | * uses always #1 for the root hub of the controller. So USB stack's | |
1319 | * port #1, which is wusb virtual-port #0 has address #2. | |
1320 | */ | |
1da177e4 LT |
1321 | static void choose_address(struct usb_device *udev) |
1322 | { | |
1323 | int devnum; | |
1324 | struct usb_bus *bus = udev->bus; | |
1325 | ||
1326 | /* If khubd ever becomes multithreaded, this will need a lock */ | |
8af548dc IPG |
1327 | if (udev->wusb) { |
1328 | devnum = udev->portnum + 1; | |
1329 | BUG_ON(test_bit(devnum, bus->devmap.devicemap)); | |
1330 | } else { | |
1331 | /* Try to allocate the next devnum beginning at | |
1332 | * bus->devnum_next. */ | |
1333 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, | |
1334 | bus->devnum_next); | |
1335 | if (devnum >= 128) | |
1336 | devnum = find_next_zero_bit(bus->devmap.devicemap, | |
1337 | 128, 1); | |
1338 | bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); | |
1339 | } | |
1da177e4 LT |
1340 | if (devnum < 128) { |
1341 | set_bit(devnum, bus->devmap.devicemap); | |
1342 | udev->devnum = devnum; | |
1343 | } | |
1344 | } | |
1345 | ||
1346 | static void release_address(struct usb_device *udev) | |
1347 | { | |
1348 | if (udev->devnum > 0) { | |
1349 | clear_bit(udev->devnum, udev->bus->devmap.devicemap); | |
1350 | udev->devnum = -1; | |
1351 | } | |
1352 | } | |
1353 | ||
4953d141 DV |
1354 | static void update_address(struct usb_device *udev, int devnum) |
1355 | { | |
1356 | /* The address for a WUSB device is managed by wusbcore. */ | |
1357 | if (!udev->wusb) | |
1358 | udev->devnum = devnum; | |
1359 | } | |
1360 | ||
d5d4db70 AS |
1361 | #ifdef CONFIG_USB_SUSPEND |
1362 | ||
1363 | static void usb_stop_pm(struct usb_device *udev) | |
1364 | { | |
1365 | /* Synchronize with the ksuspend thread to prevent any more | |
1366 | * autosuspend requests from being submitted, and decrement | |
1367 | * the parent's count of unsuspended children. | |
1368 | */ | |
1369 | usb_pm_lock(udev); | |
1370 | if (udev->parent && !udev->discon_suspended) | |
1371 | usb_autosuspend_device(udev->parent); | |
1372 | usb_pm_unlock(udev); | |
1373 | ||
1374 | /* Stop any autosuspend requests already submitted */ | |
1375 | cancel_rearming_delayed_work(&udev->autosuspend); | |
1376 | } | |
1377 | ||
1378 | #else | |
1379 | ||
1380 | static inline void usb_stop_pm(struct usb_device *udev) | |
1381 | { } | |
1382 | ||
1383 | #endif | |
1384 | ||
1da177e4 LT |
1385 | /** |
1386 | * usb_disconnect - disconnect a device (usbcore-internal) | |
1387 | * @pdev: pointer to device being disconnected | |
1388 | * Context: !in_interrupt () | |
1389 | * | |
1390 | * Something got disconnected. Get rid of it and all of its children. | |
1391 | * | |
1392 | * If *pdev is a normal device then the parent hub must already be locked. | |
1393 | * If *pdev is a root hub then this routine will acquire the | |
1394 | * usb_bus_list_lock on behalf of the caller. | |
1395 | * | |
1396 | * Only hub drivers (including virtual root hub drivers for host | |
1397 | * controllers) should ever call this. | |
1398 | * | |
1399 | * This call is synchronous, and may not be used in an interrupt context. | |
1400 | */ | |
1401 | void usb_disconnect(struct usb_device **pdev) | |
1402 | { | |
1403 | struct usb_device *udev = *pdev; | |
1404 | int i; | |
1405 | ||
1406 | if (!udev) { | |
441b62c1 | 1407 | pr_debug ("%s nodev\n", __func__); |
1da177e4 LT |
1408 | return; |
1409 | } | |
1410 | ||
1411 | /* mark the device as inactive, so any further urb submissions for | |
1412 | * this device (and any of its children) will fail immediately. | |
1413 | * this quiesces everyting except pending urbs. | |
1414 | */ | |
1415 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
1da177e4 LT |
1416 | dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum); |
1417 | ||
9ad3d6cc AS |
1418 | usb_lock_device(udev); |
1419 | ||
1da177e4 LT |
1420 | /* Free up all the children before we remove this device */ |
1421 | for (i = 0; i < USB_MAXCHILDREN; i++) { | |
1422 | if (udev->children[i]) | |
1423 | usb_disconnect(&udev->children[i]); | |
1424 | } | |
1425 | ||
1426 | /* deallocate hcd/hardware state ... nuking all pending urbs and | |
1427 | * cleaning up all state associated with the current configuration | |
1428 | * so that the hardware is now fully quiesced. | |
1429 | */ | |
782da727 | 1430 | dev_dbg (&udev->dev, "unregistering device\n"); |
1da177e4 | 1431 | usb_disable_device(udev, 0); |
cde217a5 | 1432 | usb_hcd_synchronize_unlinks(udev); |
1da177e4 | 1433 | |
782da727 AS |
1434 | usb_unlock_device(udev); |
1435 | ||
e16362a0 AS |
1436 | /* Remove the device-specific files from sysfs. This must be |
1437 | * done with udev unlocked, because some of the attribute | |
1438 | * routines try to acquire the device lock. | |
1439 | */ | |
1440 | usb_remove_sysfs_dev_files(udev); | |
1441 | ||
782da727 AS |
1442 | /* Unregister the device. The device driver is responsible |
1443 | * for removing the device files from usbfs and sysfs and for | |
1444 | * de-configuring the device. | |
1445 | */ | |
1446 | device_del(&udev->dev); | |
3099e75a | 1447 | |
782da727 | 1448 | /* Free the device number and delete the parent's children[] |
1da177e4 LT |
1449 | * (or root_hub) pointer. |
1450 | */ | |
1da177e4 | 1451 | release_address(udev); |
1da177e4 LT |
1452 | |
1453 | /* Avoid races with recursively_mark_NOTATTACHED() */ | |
1454 | spin_lock_irq(&device_state_lock); | |
1455 | *pdev = NULL; | |
1456 | spin_unlock_irq(&device_state_lock); | |
1457 | ||
d5d4db70 | 1458 | usb_stop_pm(udev); |
ee49fb5d | 1459 | |
782da727 | 1460 | put_device(&udev->dev); |
1da177e4 LT |
1461 | } |
1462 | ||
f2a383e4 | 1463 | #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES |
1da177e4 LT |
1464 | static void show_string(struct usb_device *udev, char *id, char *string) |
1465 | { | |
1466 | if (!string) | |
1467 | return; | |
1468 | dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); | |
1469 | } | |
1470 | ||
f2a383e4 GKH |
1471 | static void announce_device(struct usb_device *udev) |
1472 | { | |
1473 | dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", | |
1474 | le16_to_cpu(udev->descriptor.idVendor), | |
1475 | le16_to_cpu(udev->descriptor.idProduct)); | |
1476 | dev_info(&udev->dev, "New USB device strings: Mfr=%d, Product=%d, " | |
1477 | "SerialNumber=%d\n", | |
1478 | udev->descriptor.iManufacturer, | |
1479 | udev->descriptor.iProduct, | |
1480 | udev->descriptor.iSerialNumber); | |
1481 | show_string(udev, "Product", udev->product); | |
1482 | show_string(udev, "Manufacturer", udev->manufacturer); | |
1483 | show_string(udev, "SerialNumber", udev->serial); | |
1484 | } | |
1da177e4 | 1485 | #else |
f2a383e4 | 1486 | static inline void announce_device(struct usb_device *udev) { } |
1da177e4 LT |
1487 | #endif |
1488 | ||
1da177e4 LT |
1489 | #ifdef CONFIG_USB_OTG |
1490 | #include "otg_whitelist.h" | |
1491 | #endif | |
1492 | ||
3ede760f | 1493 | /** |
d9d16e8a | 1494 | * usb_configure_device_otg - FIXME (usbcore-internal) |
3ede760f ON |
1495 | * @udev: newly addressed device (in ADDRESS state) |
1496 | * | |
d9d16e8a | 1497 | * Do configuration for On-The-Go devices |
3ede760f | 1498 | */ |
d9d16e8a | 1499 | static int usb_configure_device_otg(struct usb_device *udev) |
1da177e4 | 1500 | { |
d9d16e8a | 1501 | int err = 0; |
1da177e4 LT |
1502 | |
1503 | #ifdef CONFIG_USB_OTG | |
1504 | /* | |
1505 | * OTG-aware devices on OTG-capable root hubs may be able to use SRP, | |
1506 | * to wake us after we've powered off VBUS; and HNP, switching roles | |
1507 | * "host" to "peripheral". The OTG descriptor helps figure this out. | |
1508 | */ | |
1509 | if (!udev->bus->is_b_host | |
1510 | && udev->config | |
1511 | && udev->parent == udev->bus->root_hub) { | |
1512 | struct usb_otg_descriptor *desc = 0; | |
1513 | struct usb_bus *bus = udev->bus; | |
1514 | ||
1515 | /* descriptor may appear anywhere in config */ | |
1516 | if (__usb_get_extra_descriptor (udev->rawdescriptors[0], | |
1517 | le16_to_cpu(udev->config[0].desc.wTotalLength), | |
1518 | USB_DT_OTG, (void **) &desc) == 0) { | |
1519 | if (desc->bmAttributes & USB_OTG_HNP) { | |
12c3da34 | 1520 | unsigned port1 = udev->portnum; |
fc849b85 | 1521 | |
1da177e4 LT |
1522 | dev_info(&udev->dev, |
1523 | "Dual-Role OTG device on %sHNP port\n", | |
1524 | (port1 == bus->otg_port) | |
1525 | ? "" : "non-"); | |
1526 | ||
1527 | /* enable HNP before suspend, it's simpler */ | |
1528 | if (port1 == bus->otg_port) | |
1529 | bus->b_hnp_enable = 1; | |
1530 | err = usb_control_msg(udev, | |
1531 | usb_sndctrlpipe(udev, 0), | |
1532 | USB_REQ_SET_FEATURE, 0, | |
1533 | bus->b_hnp_enable | |
1534 | ? USB_DEVICE_B_HNP_ENABLE | |
1535 | : USB_DEVICE_A_ALT_HNP_SUPPORT, | |
1536 | 0, NULL, 0, USB_CTRL_SET_TIMEOUT); | |
1537 | if (err < 0) { | |
1538 | /* OTG MESSAGE: report errors here, | |
1539 | * customize to match your product. | |
1540 | */ | |
1541 | dev_info(&udev->dev, | |
1542 | "can't set HNP mode; %d\n", | |
1543 | err); | |
1544 | bus->b_hnp_enable = 0; | |
1545 | } | |
1546 | } | |
1547 | } | |
1548 | } | |
1549 | ||
1550 | if (!is_targeted(udev)) { | |
1551 | ||
1552 | /* Maybe it can talk to us, though we can't talk to it. | |
1553 | * (Includes HNP test device.) | |
1554 | */ | |
1555 | if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { | |
4956eccd | 1556 | err = usb_port_suspend(udev); |
1da177e4 LT |
1557 | if (err < 0) |
1558 | dev_dbg(&udev->dev, "HNP fail, %d\n", err); | |
1559 | } | |
ffcdc18d | 1560 | err = -ENOTSUPP; |
1da177e4 LT |
1561 | goto fail; |
1562 | } | |
d9d16e8a | 1563 | fail: |
1da177e4 | 1564 | #endif |
d9d16e8a IPG |
1565 | return err; |
1566 | } | |
1567 | ||
1568 | ||
1569 | /** | |
1570 | * usb_configure_device - Detect and probe device intfs/otg (usbcore-internal) | |
1571 | * @udev: newly addressed device (in ADDRESS state) | |
1572 | * | |
1573 | * This is only called by usb_new_device() and usb_authorize_device() | |
1574 | * and FIXME -- all comments that apply to them apply here wrt to | |
1575 | * environment. | |
1576 | * | |
1577 | * If the device is WUSB and not authorized, we don't attempt to read | |
1578 | * the string descriptors, as they will be errored out by the device | |
1579 | * until it has been authorized. | |
1580 | */ | |
1581 | static int usb_configure_device(struct usb_device *udev) | |
1582 | { | |
1583 | int err; | |
1da177e4 | 1584 | |
d9d16e8a IPG |
1585 | if (udev->config == NULL) { |
1586 | err = usb_get_configuration(udev); | |
1587 | if (err < 0) { | |
1588 | dev_err(&udev->dev, "can't read configurations, error %d\n", | |
1589 | err); | |
1590 | goto fail; | |
1591 | } | |
1592 | } | |
1593 | if (udev->wusb == 1 && udev->authorized == 0) { | |
1594 | udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1595 | udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1596 | udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1597 | } | |
1598 | else { | |
1599 | /* read the standard strings and cache them if present */ | |
1600 | udev->product = usb_cache_string(udev, udev->descriptor.iProduct); | |
1601 | udev->manufacturer = usb_cache_string(udev, | |
1602 | udev->descriptor.iManufacturer); | |
1603 | udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); | |
1604 | } | |
1605 | err = usb_configure_device_otg(udev); | |
1606 | fail: | |
1607 | return err; | |
1608 | } | |
1609 | ||
1610 | ||
1611 | /** | |
1612 | * usb_new_device - perform initial device setup (usbcore-internal) | |
1613 | * @udev: newly addressed device (in ADDRESS state) | |
1614 | * | |
1615 | * This is called with devices which have been enumerated, but not yet | |
1616 | * configured. The device descriptor is available, but not descriptors | |
1617 | * for any device configuration. The caller must have locked either | |
1618 | * the parent hub (if udev is a normal device) or else the | |
1619 | * usb_bus_list_lock (if udev is a root hub). The parent's pointer to | |
1620 | * udev has already been installed, but udev is not yet visible through | |
1621 | * sysfs or other filesystem code. | |
1622 | * | |
1623 | * It will return if the device is configured properly or not. Zero if | |
1624 | * the interface was registered with the driver core; else a negative | |
1625 | * errno value. | |
1626 | * | |
1627 | * This call is synchronous, and may not be used in an interrupt context. | |
1628 | * | |
1629 | * Only the hub driver or root-hub registrar should ever call this. | |
1630 | */ | |
1631 | int usb_new_device(struct usb_device *udev) | |
1632 | { | |
1633 | int err; | |
1634 | ||
1635 | usb_detect_quirks(udev); /* Determine quirks */ | |
1636 | err = usb_configure_device(udev); /* detect & probe dev/intfs */ | |
1637 | if (err < 0) | |
1638 | goto fail; | |
9f8b17e6 KS |
1639 | /* export the usbdev device-node for libusb */ |
1640 | udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, | |
1641 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
1642 | ||
195af2cc AS |
1643 | /* Increment the parent's count of unsuspended children */ |
1644 | if (udev->parent) | |
1645 | usb_autoresume_device(udev->parent); | |
1646 | ||
782da727 | 1647 | /* Register the device. The device driver is responsible |
9f8b17e6 KS |
1648 | * for adding the device files to sysfs and for configuring |
1649 | * the device. | |
782da727 | 1650 | */ |
9f8b17e6 | 1651 | err = device_add(&udev->dev); |
1da177e4 LT |
1652 | if (err) { |
1653 | dev_err(&udev->dev, "can't device_add, error %d\n", err); | |
1654 | goto fail; | |
1655 | } | |
9ad3d6cc | 1656 | |
e16362a0 AS |
1657 | /* put device-specific files into sysfs */ |
1658 | usb_create_sysfs_dev_files(udev); | |
1659 | ||
d9d16e8a | 1660 | /* Tell the world! */ |
f2a383e4 | 1661 | announce_device(udev); |
c066475e | 1662 | return err; |
1da177e4 LT |
1663 | |
1664 | fail: | |
1665 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
d9d16e8a | 1666 | return err; |
1da177e4 LT |
1667 | } |
1668 | ||
93993a0a IPG |
1669 | |
1670 | /** | |
fd39c86b RD |
1671 | * usb_deauthorize_device - deauthorize a device (usbcore-internal) |
1672 | * @usb_dev: USB device | |
1673 | * | |
1674 | * Move the USB device to a very basic state where interfaces are disabled | |
1675 | * and the device is in fact unconfigured and unusable. | |
93993a0a IPG |
1676 | * |
1677 | * We share a lock (that we have) with device_del(), so we need to | |
1678 | * defer its call. | |
1679 | */ | |
1680 | int usb_deauthorize_device(struct usb_device *usb_dev) | |
1681 | { | |
1682 | unsigned cnt; | |
1683 | usb_lock_device(usb_dev); | |
1684 | if (usb_dev->authorized == 0) | |
1685 | goto out_unauthorized; | |
1686 | usb_dev->authorized = 0; | |
1687 | usb_set_configuration(usb_dev, -1); | |
1688 | usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1689 | usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1690 | usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1691 | kfree(usb_dev->config); | |
1692 | usb_dev->config = NULL; | |
1693 | for (cnt = 0; cnt < usb_dev->descriptor.bNumConfigurations; cnt++) | |
1694 | kfree(usb_dev->rawdescriptors[cnt]); | |
1695 | usb_dev->descriptor.bNumConfigurations = 0; | |
1696 | kfree(usb_dev->rawdescriptors); | |
1697 | out_unauthorized: | |
1698 | usb_unlock_device(usb_dev); | |
1699 | return 0; | |
1700 | } | |
1701 | ||
1702 | ||
1703 | int usb_authorize_device(struct usb_device *usb_dev) | |
1704 | { | |
1705 | int result = 0, c; | |
1706 | usb_lock_device(usb_dev); | |
1707 | if (usb_dev->authorized == 1) | |
1708 | goto out_authorized; | |
1709 | kfree(usb_dev->product); | |
1710 | usb_dev->product = NULL; | |
1711 | kfree(usb_dev->manufacturer); | |
1712 | usb_dev->manufacturer = NULL; | |
1713 | kfree(usb_dev->serial); | |
1714 | usb_dev->serial = NULL; | |
1715 | result = usb_autoresume_device(usb_dev); | |
1716 | if (result < 0) { | |
1717 | dev_err(&usb_dev->dev, | |
1718 | "can't autoresume for authorization: %d\n", result); | |
1719 | goto error_autoresume; | |
1720 | } | |
1721 | result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); | |
1722 | if (result < 0) { | |
1723 | dev_err(&usb_dev->dev, "can't re-read device descriptor for " | |
1724 | "authorization: %d\n", result); | |
1725 | goto error_device_descriptor; | |
1726 | } | |
1727 | usb_dev->authorized = 1; | |
1728 | result = usb_configure_device(usb_dev); | |
1729 | if (result < 0) | |
1730 | goto error_configure; | |
1731 | /* Choose and set the configuration. This registers the interfaces | |
1732 | * with the driver core and lets interface drivers bind to them. | |
1733 | */ | |
b5ea060f | 1734 | c = usb_choose_configuration(usb_dev); |
93993a0a IPG |
1735 | if (c >= 0) { |
1736 | result = usb_set_configuration(usb_dev, c); | |
1737 | if (result) { | |
1738 | dev_err(&usb_dev->dev, | |
1739 | "can't set config #%d, error %d\n", c, result); | |
1740 | /* This need not be fatal. The user can try to | |
1741 | * set other configurations. */ | |
1742 | } | |
1743 | } | |
1744 | dev_info(&usb_dev->dev, "authorized to connect\n"); | |
1745 | error_configure: | |
1746 | error_device_descriptor: | |
1747 | error_autoresume: | |
1748 | out_authorized: | |
1749 | usb_unlock_device(usb_dev); // complements locktree | |
1750 | return result; | |
1751 | } | |
1752 | ||
1753 | ||
0165de09 IPG |
1754 | /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ |
1755 | static unsigned hub_is_wusb(struct usb_hub *hub) | |
1756 | { | |
1757 | struct usb_hcd *hcd; | |
1758 | if (hub->hdev->parent != NULL) /* not a root hub? */ | |
1759 | return 0; | |
1760 | hcd = container_of(hub->hdev->bus, struct usb_hcd, self); | |
1761 | return hcd->wireless; | |
1762 | } | |
1763 | ||
1764 | ||
1da177e4 LT |
1765 | #define PORT_RESET_TRIES 5 |
1766 | #define SET_ADDRESS_TRIES 2 | |
1767 | #define GET_DESCRIPTOR_TRIES 2 | |
1768 | #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) | |
1769 | #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) | |
1770 | ||
1771 | #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ | |
1772 | #define HUB_SHORT_RESET_TIME 10 | |
1773 | #define HUB_LONG_RESET_TIME 200 | |
1774 | #define HUB_RESET_TIMEOUT 500 | |
1775 | ||
1776 | static int hub_port_wait_reset(struct usb_hub *hub, int port1, | |
1777 | struct usb_device *udev, unsigned int delay) | |
1778 | { | |
1779 | int delay_time, ret; | |
1780 | u16 portstatus; | |
1781 | u16 portchange; | |
1782 | ||
1783 | for (delay_time = 0; | |
1784 | delay_time < HUB_RESET_TIMEOUT; | |
1785 | delay_time += delay) { | |
1786 | /* wait to give the device a chance to reset */ | |
1787 | msleep(delay); | |
1788 | ||
1789 | /* read and decode port status */ | |
1790 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
1791 | if (ret < 0) | |
1792 | return ret; | |
1793 | ||
1794 | /* Device went away? */ | |
1795 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) | |
1796 | return -ENOTCONN; | |
1797 | ||
dd4dd19e | 1798 | /* bomb out completely if the connection bounced */ |
1da177e4 | 1799 | if ((portchange & USB_PORT_STAT_C_CONNECTION)) |
dd4dd19e | 1800 | return -ENOTCONN; |
1da177e4 LT |
1801 | |
1802 | /* if we`ve finished resetting, then break out of the loop */ | |
1803 | if (!(portstatus & USB_PORT_STAT_RESET) && | |
1804 | (portstatus & USB_PORT_STAT_ENABLE)) { | |
0165de09 IPG |
1805 | if (hub_is_wusb(hub)) |
1806 | udev->speed = USB_SPEED_VARIABLE; | |
1807 | else if (portstatus & USB_PORT_STAT_HIGH_SPEED) | |
1da177e4 LT |
1808 | udev->speed = USB_SPEED_HIGH; |
1809 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) | |
1810 | udev->speed = USB_SPEED_LOW; | |
1811 | else | |
1812 | udev->speed = USB_SPEED_FULL; | |
1813 | return 0; | |
1814 | } | |
1815 | ||
1816 | /* switch to the long delay after two short delay failures */ | |
1817 | if (delay_time >= 2 * HUB_SHORT_RESET_TIME) | |
1818 | delay = HUB_LONG_RESET_TIME; | |
1819 | ||
1820 | dev_dbg (hub->intfdev, | |
1821 | "port %d not reset yet, waiting %dms\n", | |
1822 | port1, delay); | |
1823 | } | |
1824 | ||
1825 | return -EBUSY; | |
1826 | } | |
1827 | ||
1828 | static int hub_port_reset(struct usb_hub *hub, int port1, | |
1829 | struct usb_device *udev, unsigned int delay) | |
1830 | { | |
1831 | int i, status; | |
1832 | ||
32fe0198 AS |
1833 | /* Block EHCI CF initialization during the port reset. |
1834 | * Some companion controllers don't like it when they mix. | |
1835 | */ | |
1836 | down_read(&ehci_cf_port_reset_rwsem); | |
1837 | ||
1da177e4 LT |
1838 | /* Reset the port */ |
1839 | for (i = 0; i < PORT_RESET_TRIES; i++) { | |
1840 | status = set_port_feature(hub->hdev, | |
1841 | port1, USB_PORT_FEAT_RESET); | |
1842 | if (status) | |
1843 | dev_err(hub->intfdev, | |
1844 | "cannot reset port %d (err = %d)\n", | |
1845 | port1, status); | |
1846 | else { | |
1847 | status = hub_port_wait_reset(hub, port1, udev, delay); | |
dd16525b | 1848 | if (status && status != -ENOTCONN) |
1da177e4 LT |
1849 | dev_dbg(hub->intfdev, |
1850 | "port_wait_reset: err = %d\n", | |
1851 | status); | |
1852 | } | |
1853 | ||
1854 | /* return on disconnect or reset */ | |
1855 | switch (status) { | |
1856 | case 0: | |
b789696a DB |
1857 | /* TRSTRCY = 10 ms; plus some extra */ |
1858 | msleep(10 + 40); | |
4953d141 | 1859 | update_address(udev, 0); |
1da177e4 LT |
1860 | /* FALL THROUGH */ |
1861 | case -ENOTCONN: | |
1862 | case -ENODEV: | |
1863 | clear_port_feature(hub->hdev, | |
1864 | port1, USB_PORT_FEAT_C_RESET); | |
1865 | /* FIXME need disconnect() for NOTATTACHED device */ | |
1866 | usb_set_device_state(udev, status | |
1867 | ? USB_STATE_NOTATTACHED | |
1868 | : USB_STATE_DEFAULT); | |
32fe0198 | 1869 | goto done; |
1da177e4 LT |
1870 | } |
1871 | ||
1872 | dev_dbg (hub->intfdev, | |
1873 | "port %d not enabled, trying reset again...\n", | |
1874 | port1); | |
1875 | delay = HUB_LONG_RESET_TIME; | |
1876 | } | |
1877 | ||
1878 | dev_err (hub->intfdev, | |
1879 | "Cannot enable port %i. Maybe the USB cable is bad?\n", | |
1880 | port1); | |
1881 | ||
32fe0198 AS |
1882 | done: |
1883 | up_read(&ehci_cf_port_reset_rwsem); | |
1da177e4 LT |
1884 | return status; |
1885 | } | |
1886 | ||
d388dab7 | 1887 | #ifdef CONFIG_PM |
1da177e4 | 1888 | |
b01b03f3 AS |
1889 | #define MASK_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION | \ |
1890 | USB_PORT_STAT_SUSPEND) | |
1891 | #define WANT_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION) | |
1892 | ||
1893 | /* Determine whether the device on a port is ready for a normal resume, | |
1894 | * is ready for a reset-resume, or should be disconnected. | |
1895 | */ | |
1896 | static int check_port_resume_type(struct usb_device *udev, | |
1897 | struct usb_hub *hub, int port1, | |
1898 | int status, unsigned portchange, unsigned portstatus) | |
1899 | { | |
1900 | /* Is the device still present? */ | |
1901 | if (status || (portstatus & MASK_BITS) != WANT_BITS) { | |
1902 | if (status >= 0) | |
1903 | status = -ENODEV; | |
1904 | } | |
1905 | ||
86c57edf AS |
1906 | /* Can't do a normal resume if the port isn't enabled, |
1907 | * so try a reset-resume instead. | |
1908 | */ | |
1909 | else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { | |
1910 | if (udev->persist_enabled) | |
1911 | udev->reset_resume = 1; | |
1912 | else | |
1913 | status = -ENODEV; | |
1914 | } | |
b01b03f3 AS |
1915 | |
1916 | if (status) { | |
1917 | dev_dbg(hub->intfdev, | |
1918 | "port %d status %04x.%04x after resume, %d\n", | |
1919 | port1, portchange, portstatus, status); | |
1920 | } else if (udev->reset_resume) { | |
1921 | ||
1922 | /* Late port handoff can set status-change bits */ | |
1923 | if (portchange & USB_PORT_STAT_C_CONNECTION) | |
1924 | clear_port_feature(hub->hdev, port1, | |
1925 | USB_PORT_FEAT_C_CONNECTION); | |
1926 | if (portchange & USB_PORT_STAT_C_ENABLE) | |
1927 | clear_port_feature(hub->hdev, port1, | |
1928 | USB_PORT_FEAT_C_ENABLE); | |
1929 | } | |
1930 | ||
1931 | return status; | |
1932 | } | |
1933 | ||
1da177e4 LT |
1934 | #ifdef CONFIG_USB_SUSPEND |
1935 | ||
1936 | /* | |
624d6c07 AS |
1937 | * usb_port_suspend - suspend a usb device's upstream port |
1938 | * @udev: device that's no longer in active use, not a root hub | |
1939 | * Context: must be able to sleep; device not locked; pm locks held | |
1940 | * | |
1941 | * Suspends a USB device that isn't in active use, conserving power. | |
1942 | * Devices may wake out of a suspend, if anything important happens, | |
1943 | * using the remote wakeup mechanism. They may also be taken out of | |
1944 | * suspend by the host, using usb_port_resume(). It's also routine | |
1945 | * to disconnect devices while they are suspended. | |
1946 | * | |
1947 | * This only affects the USB hardware for a device; its interfaces | |
1948 | * (and, for hubs, child devices) must already have been suspended. | |
1949 | * | |
1da177e4 LT |
1950 | * Selective port suspend reduces power; most suspended devices draw |
1951 | * less than 500 uA. It's also used in OTG, along with remote wakeup. | |
1952 | * All devices below the suspended port are also suspended. | |
1953 | * | |
1954 | * Devices leave suspend state when the host wakes them up. Some devices | |
1955 | * also support "remote wakeup", where the device can activate the USB | |
1956 | * tree above them to deliver data, such as a keypress or packet. In | |
1957 | * some cases, this wakes the USB host. | |
624d6c07 AS |
1958 | * |
1959 | * Suspending OTG devices may trigger HNP, if that's been enabled | |
1960 | * between a pair of dual-role devices. That will change roles, such | |
1961 | * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. | |
1962 | * | |
1963 | * Devices on USB hub ports have only one "suspend" state, corresponding | |
1964 | * to ACPI D2, "may cause the device to lose some context". | |
1965 | * State transitions include: | |
1966 | * | |
1967 | * - suspend, resume ... when the VBUS power link stays live | |
1968 | * - suspend, disconnect ... VBUS lost | |
1969 | * | |
1970 | * Once VBUS drop breaks the circuit, the port it's using has to go through | |
1971 | * normal re-enumeration procedures, starting with enabling VBUS power. | |
1972 | * Other than re-initializing the hub (plug/unplug, except for root hubs), | |
1973 | * Linux (2.6) currently has NO mechanisms to initiate that: no khubd | |
1974 | * timer, no SRP, no requests through sysfs. | |
1975 | * | |
1976 | * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when | |
1977 | * the root hub for their bus goes into global suspend ... so we don't | |
1978 | * (falsely) update the device power state to say it suspended. | |
1979 | * | |
1980 | * Returns 0 on success, else negative errno. | |
1da177e4 | 1981 | */ |
624d6c07 | 1982 | int usb_port_suspend(struct usb_device *udev) |
1da177e4 | 1983 | { |
624d6c07 AS |
1984 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
1985 | int port1 = udev->portnum; | |
1986 | int status; | |
1da177e4 LT |
1987 | |
1988 | // dev_dbg(hub->intfdev, "suspend port %d\n", port1); | |
1989 | ||
1990 | /* enable remote wakeup when appropriate; this lets the device | |
1991 | * wake up the upstream hub (including maybe the root hub). | |
1992 | * | |
1993 | * NOTE: OTG devices may issue remote wakeup (or SRP) even when | |
1994 | * we don't explicitly enable it here. | |
1995 | */ | |
645daaab | 1996 | if (udev->do_remote_wakeup) { |
1da177e4 LT |
1997 | status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
1998 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
1999 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
2000 | NULL, 0, | |
2001 | USB_CTRL_SET_TIMEOUT); | |
2002 | if (status) | |
624d6c07 AS |
2003 | dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", |
2004 | status); | |
1da177e4 LT |
2005 | } |
2006 | ||
2007 | /* see 7.1.7.6 */ | |
2008 | status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); | |
2009 | if (status) { | |
624d6c07 AS |
2010 | dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", |
2011 | port1, status); | |
1da177e4 LT |
2012 | /* paranoia: "should not happen" */ |
2013 | (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
2014 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, | |
2015 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
2016 | NULL, 0, | |
2017 | USB_CTRL_SET_TIMEOUT); | |
2018 | } else { | |
2019 | /* device has up to 10 msec to fully suspend */ | |
645daaab AS |
2020 | dev_dbg(&udev->dev, "usb %ssuspend\n", |
2021 | udev->auto_pm ? "auto-" : ""); | |
1da177e4 LT |
2022 | usb_set_device_state(udev, USB_STATE_SUSPENDED); |
2023 | msleep(10); | |
2024 | } | |
2025 | return status; | |
2026 | } | |
2027 | ||
1da177e4 | 2028 | /* |
390a8c34 DB |
2029 | * If the USB "suspend" state is in use (rather than "global suspend"), |
2030 | * many devices will be individually taken out of suspend state using | |
54515fe5 | 2031 | * special "resume" signaling. This routine kicks in shortly after |
1da177e4 LT |
2032 | * hardware resume signaling is finished, either because of selective |
2033 | * resume (by host) or remote wakeup (by device) ... now see what changed | |
2034 | * in the tree that's rooted at this device. | |
54515fe5 AS |
2035 | * |
2036 | * If @udev->reset_resume is set then the device is reset before the | |
2037 | * status check is done. | |
1da177e4 | 2038 | */ |
140d8f68 | 2039 | static int finish_port_resume(struct usb_device *udev) |
1da177e4 | 2040 | { |
54515fe5 | 2041 | int status = 0; |
1da177e4 LT |
2042 | u16 devstatus; |
2043 | ||
2044 | /* caller owns the udev device lock */ | |
54515fe5 AS |
2045 | dev_dbg(&udev->dev, "finish %sresume\n", |
2046 | udev->reset_resume ? "reset-" : ""); | |
1da177e4 LT |
2047 | |
2048 | /* usb ch9 identifies four variants of SUSPENDED, based on what | |
2049 | * state the device resumes to. Linux currently won't see the | |
2050 | * first two on the host side; they'd be inside hub_port_init() | |
2051 | * during many timeouts, but khubd can't suspend until later. | |
2052 | */ | |
2053 | usb_set_device_state(udev, udev->actconfig | |
2054 | ? USB_STATE_CONFIGURED | |
2055 | : USB_STATE_ADDRESS); | |
1da177e4 | 2056 | |
54515fe5 AS |
2057 | /* 10.5.4.5 says not to reset a suspended port if the attached |
2058 | * device is enabled for remote wakeup. Hence the reset | |
2059 | * operation is carried out here, after the port has been | |
2060 | * resumed. | |
2061 | */ | |
2062 | if (udev->reset_resume) | |
86c57edf | 2063 | retry_reset_resume: |
742120c6 | 2064 | status = usb_reset_and_verify_device(udev); |
54515fe5 | 2065 | |
1da177e4 LT |
2066 | /* 10.5.4.5 says be sure devices in the tree are still there. |
2067 | * For now let's assume the device didn't go crazy on resume, | |
2068 | * and device drivers will know about any resume quirks. | |
2069 | */ | |
54515fe5 | 2070 | if (status == 0) { |
46dede46 | 2071 | devstatus = 0; |
54515fe5 AS |
2072 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); |
2073 | if (status >= 0) | |
46dede46 | 2074 | status = (status > 0 ? 0 : -ENODEV); |
86c57edf AS |
2075 | |
2076 | /* If a normal resume failed, try doing a reset-resume */ | |
2077 | if (status && !udev->reset_resume && udev->persist_enabled) { | |
2078 | dev_dbg(&udev->dev, "retry with reset-resume\n"); | |
2079 | udev->reset_resume = 1; | |
2080 | goto retry_reset_resume; | |
2081 | } | |
54515fe5 | 2082 | } |
b40b7a90 | 2083 | |
624d6c07 AS |
2084 | if (status) { |
2085 | dev_dbg(&udev->dev, "gone after usb resume? status %d\n", | |
2086 | status); | |
2087 | } else if (udev->actconfig) { | |
1da177e4 | 2088 | le16_to_cpus(&devstatus); |
686314cf | 2089 | if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) { |
1da177e4 LT |
2090 | status = usb_control_msg(udev, |
2091 | usb_sndctrlpipe(udev, 0), | |
2092 | USB_REQ_CLEAR_FEATURE, | |
2093 | USB_RECIP_DEVICE, | |
2094 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
2095 | NULL, 0, | |
2096 | USB_CTRL_SET_TIMEOUT); | |
a8e7c565 | 2097 | if (status) |
1da177e4 LT |
2098 | dev_dbg(&udev->dev, "disable remote " |
2099 | "wakeup, status %d\n", status); | |
4bf0ba86 | 2100 | } |
1da177e4 | 2101 | status = 0; |
1da177e4 LT |
2102 | } |
2103 | return status; | |
2104 | } | |
2105 | ||
624d6c07 AS |
2106 | /* |
2107 | * usb_port_resume - re-activate a suspended usb device's upstream port | |
2108 | * @udev: device to re-activate, not a root hub | |
2109 | * Context: must be able to sleep; device not locked; pm locks held | |
2110 | * | |
2111 | * This will re-activate the suspended device, increasing power usage | |
2112 | * while letting drivers communicate again with its endpoints. | |
2113 | * USB resume explicitly guarantees that the power session between | |
2114 | * the host and the device is the same as it was when the device | |
2115 | * suspended. | |
2116 | * | |
feccc30d AS |
2117 | * If @udev->reset_resume is set then this routine won't check that the |
2118 | * port is still enabled. Furthermore, finish_port_resume() above will | |
54515fe5 AS |
2119 | * reset @udev. The end result is that a broken power session can be |
2120 | * recovered and @udev will appear to persist across a loss of VBUS power. | |
2121 | * | |
2122 | * For example, if a host controller doesn't maintain VBUS suspend current | |
2123 | * during a system sleep or is reset when the system wakes up, all the USB | |
2124 | * power sessions below it will be broken. This is especially troublesome | |
2125 | * for mass-storage devices containing mounted filesystems, since the | |
2126 | * device will appear to have disconnected and all the memory mappings | |
2127 | * to it will be lost. Using the USB_PERSIST facility, the device can be | |
2128 | * made to appear as if it had not disconnected. | |
2129 | * | |
742120c6 | 2130 | * This facility can be dangerous. Although usb_reset_and_verify_device() makes |
feccc30d | 2131 | * every effort to insure that the same device is present after the |
54515fe5 AS |
2132 | * reset as before, it cannot provide a 100% guarantee. Furthermore it's |
2133 | * quite possible for a device to remain unaltered but its media to be | |
2134 | * changed. If the user replaces a flash memory card while the system is | |
2135 | * asleep, he will have only himself to blame when the filesystem on the | |
2136 | * new card is corrupted and the system crashes. | |
2137 | * | |
624d6c07 AS |
2138 | * Returns 0 on success, else negative errno. |
2139 | */ | |
2140 | int usb_port_resume(struct usb_device *udev) | |
1da177e4 | 2141 | { |
624d6c07 AS |
2142 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
2143 | int port1 = udev->portnum; | |
2144 | int status; | |
2145 | u16 portchange, portstatus; | |
d25450c6 AS |
2146 | |
2147 | /* Skip the initial Clear-Suspend step for a remote wakeup */ | |
2148 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
2149 | if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND)) | |
2150 | goto SuspendCleared; | |
1da177e4 LT |
2151 | |
2152 | // dev_dbg(hub->intfdev, "resume port %d\n", port1); | |
2153 | ||
d5cbad4b AS |
2154 | set_bit(port1, hub->busy_bits); |
2155 | ||
1da177e4 LT |
2156 | /* see 7.1.7.7; affects power usage, but not budgeting */ |
2157 | status = clear_port_feature(hub->hdev, | |
2158 | port1, USB_PORT_FEAT_SUSPEND); | |
2159 | if (status) { | |
624d6c07 AS |
2160 | dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", |
2161 | port1, status); | |
1da177e4 | 2162 | } else { |
1da177e4 | 2163 | /* drive resume for at least 20 msec */ |
686314cf AS |
2164 | dev_dbg(&udev->dev, "usb %sresume\n", |
2165 | udev->auto_pm ? "auto-" : ""); | |
1da177e4 LT |
2166 | msleep(25); |
2167 | ||
1da177e4 LT |
2168 | /* Virtual root hubs can trigger on GET_PORT_STATUS to |
2169 | * stop resume signaling. Then finish the resume | |
2170 | * sequence. | |
2171 | */ | |
d25450c6 | 2172 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
54515fe5 | 2173 | |
b01b03f3 AS |
2174 | /* TRSMRCY = 10 msec */ |
2175 | msleep(10); | |
2176 | } | |
2177 | ||
54515fe5 | 2178 | SuspendCleared: |
b01b03f3 AS |
2179 | if (status == 0) { |
2180 | if (portchange & USB_PORT_STAT_C_SUSPEND) | |
2181 | clear_port_feature(hub->hdev, port1, | |
2182 | USB_PORT_FEAT_C_SUSPEND); | |
1da177e4 | 2183 | } |
1da177e4 | 2184 | |
d5cbad4b | 2185 | clear_bit(port1, hub->busy_bits); |
d5cbad4b | 2186 | |
b01b03f3 AS |
2187 | status = check_port_resume_type(udev, |
2188 | hub, port1, status, portchange, portstatus); | |
54515fe5 AS |
2189 | if (status == 0) |
2190 | status = finish_port_resume(udev); | |
2191 | if (status < 0) { | |
2192 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); | |
2193 | hub_port_logical_disconnect(hub, port1); | |
2194 | } | |
1da177e4 LT |
2195 | return status; |
2196 | } | |
2197 | ||
8808f00c | 2198 | /* caller has locked udev */ |
1da177e4 LT |
2199 | static int remote_wakeup(struct usb_device *udev) |
2200 | { | |
2201 | int status = 0; | |
2202 | ||
1da177e4 | 2203 | if (udev->state == USB_STATE_SUSPENDED) { |
645daaab | 2204 | dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); |
1941044a | 2205 | usb_mark_last_busy(udev); |
6b157c9b | 2206 | status = usb_external_resume_device(udev); |
1da177e4 | 2207 | } |
1da177e4 LT |
2208 | return status; |
2209 | } | |
2210 | ||
d388dab7 AS |
2211 | #else /* CONFIG_USB_SUSPEND */ |
2212 | ||
2213 | /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ | |
2214 | ||
2215 | int usb_port_suspend(struct usb_device *udev) | |
2216 | { | |
2217 | return 0; | |
2218 | } | |
2219 | ||
b01b03f3 AS |
2220 | /* However we may need to do a reset-resume */ |
2221 | ||
d388dab7 AS |
2222 | int usb_port_resume(struct usb_device *udev) |
2223 | { | |
b01b03f3 AS |
2224 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
2225 | int port1 = udev->portnum; | |
2226 | int status; | |
2227 | u16 portchange, portstatus; | |
2228 | ||
2229 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
2230 | status = check_port_resume_type(udev, | |
2231 | hub, port1, status, portchange, portstatus); | |
54515fe5 | 2232 | |
b01b03f3 AS |
2233 | if (status) { |
2234 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); | |
2235 | hub_port_logical_disconnect(hub, port1); | |
2236 | } else if (udev->reset_resume) { | |
54515fe5 | 2237 | dev_dbg(&udev->dev, "reset-resume\n"); |
742120c6 | 2238 | status = usb_reset_and_verify_device(udev); |
54515fe5 AS |
2239 | } |
2240 | return status; | |
d388dab7 AS |
2241 | } |
2242 | ||
2243 | static inline int remote_wakeup(struct usb_device *udev) | |
2244 | { | |
2245 | return 0; | |
2246 | } | |
2247 | ||
2248 | #endif | |
2249 | ||
db690874 | 2250 | static int hub_suspend(struct usb_interface *intf, pm_message_t msg) |
1da177e4 LT |
2251 | { |
2252 | struct usb_hub *hub = usb_get_intfdata (intf); | |
2253 | struct usb_device *hdev = hub->hdev; | |
2254 | unsigned port1; | |
1da177e4 | 2255 | |
c9f89fa4 | 2256 | /* fail if children aren't already suspended */ |
1da177e4 LT |
2257 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
2258 | struct usb_device *udev; | |
2259 | ||
2260 | udev = hdev->children [port1-1]; | |
6840d255 | 2261 | if (udev && udev->can_submit) { |
645daaab AS |
2262 | if (!hdev->auto_pm) |
2263 | dev_dbg(&intf->dev, "port %d nyet suspended\n", | |
2264 | port1); | |
c9f89fa4 DB |
2265 | return -EBUSY; |
2266 | } | |
1da177e4 LT |
2267 | } |
2268 | ||
441b62c1 | 2269 | dev_dbg(&intf->dev, "%s\n", __func__); |
40f122f3 | 2270 | |
12f1ff83 | 2271 | /* stop khubd and related activity */ |
4330354f | 2272 | hub_quiesce(hub, HUB_SUSPEND); |
b6f6436d | 2273 | return 0; |
1da177e4 LT |
2274 | } |
2275 | ||
2276 | static int hub_resume(struct usb_interface *intf) | |
2277 | { | |
5e6effae | 2278 | struct usb_hub *hub = usb_get_intfdata(intf); |
40f122f3 | 2279 | |
5e6effae | 2280 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 2281 | hub_activate(hub, HUB_RESUME); |
1da177e4 LT |
2282 | return 0; |
2283 | } | |
2284 | ||
b41a60ec | 2285 | static int hub_reset_resume(struct usb_interface *intf) |
f07600cf | 2286 | { |
b41a60ec | 2287 | struct usb_hub *hub = usb_get_intfdata(intf); |
f07600cf | 2288 | |
5e6effae | 2289 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 2290 | hub_activate(hub, HUB_RESET_RESUME); |
f07600cf AS |
2291 | return 0; |
2292 | } | |
2293 | ||
54515fe5 AS |
2294 | /** |
2295 | * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power | |
2296 | * @rhdev: struct usb_device for the root hub | |
2297 | * | |
2298 | * The USB host controller driver calls this function when its root hub | |
2299 | * is resumed and Vbus power has been interrupted or the controller | |
feccc30d AS |
2300 | * has been reset. The routine marks @rhdev as having lost power. |
2301 | * When the hub driver is resumed it will take notice and carry out | |
2302 | * power-session recovery for all the "USB-PERSIST"-enabled child devices; | |
2303 | * the others will be disconnected. | |
54515fe5 AS |
2304 | */ |
2305 | void usb_root_hub_lost_power(struct usb_device *rhdev) | |
2306 | { | |
2307 | dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); | |
2308 | rhdev->reset_resume = 1; | |
2309 | } | |
2310 | EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); | |
2311 | ||
d388dab7 AS |
2312 | #else /* CONFIG_PM */ |
2313 | ||
2314 | static inline int remote_wakeup(struct usb_device *udev) | |
2315 | { | |
2316 | return 0; | |
2317 | } | |
2318 | ||
f07600cf AS |
2319 | #define hub_suspend NULL |
2320 | #define hub_resume NULL | |
2321 | #define hub_reset_resume NULL | |
d388dab7 AS |
2322 | #endif |
2323 | ||
1da177e4 LT |
2324 | |
2325 | /* USB 2.0 spec, 7.1.7.3 / fig 7-29: | |
2326 | * | |
2327 | * Between connect detection and reset signaling there must be a delay | |
2328 | * of 100ms at least for debounce and power-settling. The corresponding | |
2329 | * timer shall restart whenever the downstream port detects a disconnect. | |
2330 | * | |
2331 | * Apparently there are some bluetooth and irda-dongles and a number of | |
2332 | * low-speed devices for which this debounce period may last over a second. | |
2333 | * Not covered by the spec - but easy to deal with. | |
2334 | * | |
2335 | * This implementation uses a 1500ms total debounce timeout; if the | |
2336 | * connection isn't stable by then it returns -ETIMEDOUT. It checks | |
2337 | * every 25ms for transient disconnects. When the port status has been | |
2338 | * unchanged for 100ms it returns the port status. | |
2339 | */ | |
1da177e4 LT |
2340 | static int hub_port_debounce(struct usb_hub *hub, int port1) |
2341 | { | |
2342 | int ret; | |
2343 | int total_time, stable_time = 0; | |
2344 | u16 portchange, portstatus; | |
2345 | unsigned connection = 0xffff; | |
2346 | ||
2347 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { | |
2348 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
2349 | if (ret < 0) | |
2350 | return ret; | |
2351 | ||
2352 | if (!(portchange & USB_PORT_STAT_C_CONNECTION) && | |
2353 | (portstatus & USB_PORT_STAT_CONNECTION) == connection) { | |
2354 | stable_time += HUB_DEBOUNCE_STEP; | |
2355 | if (stable_time >= HUB_DEBOUNCE_STABLE) | |
2356 | break; | |
2357 | } else { | |
2358 | stable_time = 0; | |
2359 | connection = portstatus & USB_PORT_STAT_CONNECTION; | |
2360 | } | |
2361 | ||
2362 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
2363 | clear_port_feature(hub->hdev, port1, | |
2364 | USB_PORT_FEAT_C_CONNECTION); | |
2365 | } | |
2366 | ||
2367 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
2368 | break; | |
2369 | msleep(HUB_DEBOUNCE_STEP); | |
2370 | } | |
2371 | ||
2372 | dev_dbg (hub->intfdev, | |
2373 | "debounce: port %d: total %dms stable %dms status 0x%x\n", | |
2374 | port1, total_time, stable_time, portstatus); | |
2375 | ||
2376 | if (stable_time < HUB_DEBOUNCE_STABLE) | |
2377 | return -ETIMEDOUT; | |
2378 | return portstatus; | |
2379 | } | |
2380 | ||
fc721f51 | 2381 | void usb_ep0_reinit(struct usb_device *udev) |
1da177e4 LT |
2382 | { |
2383 | usb_disable_endpoint(udev, 0 + USB_DIR_IN); | |
2384 | usb_disable_endpoint(udev, 0 + USB_DIR_OUT); | |
bdd016ba | 2385 | usb_enable_endpoint(udev, &udev->ep0); |
1da177e4 | 2386 | } |
fc721f51 | 2387 | EXPORT_SYMBOL_GPL(usb_ep0_reinit); |
1da177e4 LT |
2388 | |
2389 | #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) | |
2390 | #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) | |
2391 | ||
4326ed0b | 2392 | static int hub_set_address(struct usb_device *udev, int devnum) |
1da177e4 LT |
2393 | { |
2394 | int retval; | |
2395 | ||
4326ed0b | 2396 | if (devnum <= 1) |
1da177e4 LT |
2397 | return -EINVAL; |
2398 | if (udev->state == USB_STATE_ADDRESS) | |
2399 | return 0; | |
2400 | if (udev->state != USB_STATE_DEFAULT) | |
2401 | return -EINVAL; | |
2402 | retval = usb_control_msg(udev, usb_sndaddr0pipe(), | |
4326ed0b | 2403 | USB_REQ_SET_ADDRESS, 0, devnum, 0, |
1da177e4 LT |
2404 | NULL, 0, USB_CTRL_SET_TIMEOUT); |
2405 | if (retval == 0) { | |
4953d141 DV |
2406 | /* Device now using proper address. */ |
2407 | update_address(udev, devnum); | |
1da177e4 | 2408 | usb_set_device_state(udev, USB_STATE_ADDRESS); |
fc721f51 | 2409 | usb_ep0_reinit(udev); |
1da177e4 LT |
2410 | } |
2411 | return retval; | |
2412 | } | |
2413 | ||
2414 | /* Reset device, (re)assign address, get device descriptor. | |
2415 | * Device connection must be stable, no more debouncing needed. | |
2416 | * Returns device in USB_STATE_ADDRESS, except on error. | |
2417 | * | |
2418 | * If this is called for an already-existing device (as part of | |
742120c6 | 2419 | * usb_reset_and_verify_device), the caller must own the device lock. For a |
1da177e4 LT |
2420 | * newly detected device that is not accessible through any global |
2421 | * pointers, it's not necessary to lock the device. | |
2422 | */ | |
2423 | static int | |
2424 | hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, | |
2425 | int retry_counter) | |
2426 | { | |
4186ecf8 | 2427 | static DEFINE_MUTEX(usb_address0_mutex); |
1da177e4 LT |
2428 | |
2429 | struct usb_device *hdev = hub->hdev; | |
2430 | int i, j, retval; | |
2431 | unsigned delay = HUB_SHORT_RESET_TIME; | |
2432 | enum usb_device_speed oldspeed = udev->speed; | |
83a07196 | 2433 | char *speed, *type; |
4326ed0b | 2434 | int devnum = udev->devnum; |
1da177e4 LT |
2435 | |
2436 | /* root hub ports have a slightly longer reset period | |
2437 | * (from USB 2.0 spec, section 7.1.7.5) | |
2438 | */ | |
2439 | if (!hdev->parent) { | |
2440 | delay = HUB_ROOT_RESET_TIME; | |
2441 | if (port1 == hdev->bus->otg_port) | |
2442 | hdev->bus->b_hnp_enable = 0; | |
2443 | } | |
2444 | ||
2445 | /* Some low speed devices have problems with the quick delay, so */ | |
2446 | /* be a bit pessimistic with those devices. RHbug #23670 */ | |
2447 | if (oldspeed == USB_SPEED_LOW) | |
2448 | delay = HUB_LONG_RESET_TIME; | |
2449 | ||
4186ecf8 | 2450 | mutex_lock(&usb_address0_mutex); |
1da177e4 LT |
2451 | |
2452 | /* Reset the device; full speed may morph to high speed */ | |
2453 | retval = hub_port_reset(hub, port1, udev, delay); | |
2454 | if (retval < 0) /* error or disconnect */ | |
2455 | goto fail; | |
2456 | /* success, speed is known */ | |
2457 | retval = -ENODEV; | |
2458 | ||
2459 | if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { | |
2460 | dev_dbg(&udev->dev, "device reset changed speed!\n"); | |
2461 | goto fail; | |
2462 | } | |
2463 | oldspeed = udev->speed; | |
4326ed0b | 2464 | |
1da177e4 LT |
2465 | /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... |
2466 | * it's fixed size except for full speed devices. | |
5bb6e0ae IPG |
2467 | * For Wireless USB devices, ep0 max packet is always 512 (tho |
2468 | * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. | |
1da177e4 LT |
2469 | */ |
2470 | switch (udev->speed) { | |
5bb6e0ae IPG |
2471 | case USB_SPEED_VARIABLE: /* fixed at 512 */ |
2472 | udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512); | |
2473 | break; | |
1da177e4 LT |
2474 | case USB_SPEED_HIGH: /* fixed at 64 */ |
2475 | udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); | |
2476 | break; | |
2477 | case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ | |
2478 | /* to determine the ep0 maxpacket size, try to read | |
2479 | * the device descriptor to get bMaxPacketSize0 and | |
2480 | * then correct our initial guess. | |
2481 | */ | |
2482 | udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); | |
2483 | break; | |
2484 | case USB_SPEED_LOW: /* fixed at 8 */ | |
2485 | udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8); | |
2486 | break; | |
2487 | default: | |
2488 | goto fail; | |
2489 | } | |
2490 | ||
83a07196 IPG |
2491 | type = ""; |
2492 | switch (udev->speed) { | |
2493 | case USB_SPEED_LOW: speed = "low"; break; | |
2494 | case USB_SPEED_FULL: speed = "full"; break; | |
2495 | case USB_SPEED_HIGH: speed = "high"; break; | |
2496 | case USB_SPEED_VARIABLE: | |
2497 | speed = "variable"; | |
2498 | type = "Wireless "; | |
2499 | break; | |
2500 | default: speed = "?"; break; | |
2501 | } | |
1da177e4 | 2502 | dev_info (&udev->dev, |
83a07196 IPG |
2503 | "%s %s speed %sUSB device using %s and address %d\n", |
2504 | (udev->config) ? "reset" : "new", speed, type, | |
4326ed0b | 2505 | udev->bus->controller->driver->name, devnum); |
1da177e4 LT |
2506 | |
2507 | /* Set up TT records, if needed */ | |
2508 | if (hdev->tt) { | |
2509 | udev->tt = hdev->tt; | |
2510 | udev->ttport = hdev->ttport; | |
2511 | } else if (udev->speed != USB_SPEED_HIGH | |
2512 | && hdev->speed == USB_SPEED_HIGH) { | |
2513 | udev->tt = &hub->tt; | |
2514 | udev->ttport = port1; | |
2515 | } | |
2516 | ||
2517 | /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? | |
2518 | * Because device hardware and firmware is sometimes buggy in | |
2519 | * this area, and this is how Linux has done it for ages. | |
2520 | * Change it cautiously. | |
2521 | * | |
2522 | * NOTE: If USE_NEW_SCHEME() is true we will start by issuing | |
2523 | * a 64-byte GET_DESCRIPTOR request. This is what Windows does, | |
2524 | * so it may help with some non-standards-compliant devices. | |
2525 | * Otherwise we start with SET_ADDRESS and then try to read the | |
2526 | * first 8 bytes of the device descriptor to get the ep0 maxpacket | |
2527 | * value. | |
2528 | */ | |
2529 | for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { | |
2530 | if (USE_NEW_SCHEME(retry_counter)) { | |
2531 | struct usb_device_descriptor *buf; | |
2532 | int r = 0; | |
2533 | ||
2534 | #define GET_DESCRIPTOR_BUFSIZE 64 | |
2535 | buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); | |
2536 | if (!buf) { | |
2537 | retval = -ENOMEM; | |
2538 | continue; | |
2539 | } | |
2540 | ||
b89ee19a AS |
2541 | /* Retry on all errors; some devices are flakey. |
2542 | * 255 is for WUSB devices, we actually need to use | |
2543 | * 512 (WUSB1.0[4.8.1]). | |
1da177e4 LT |
2544 | */ |
2545 | for (j = 0; j < 3; ++j) { | |
2546 | buf->bMaxPacketSize0 = 0; | |
2547 | r = usb_control_msg(udev, usb_rcvaddr0pipe(), | |
2548 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, | |
2549 | USB_DT_DEVICE << 8, 0, | |
2550 | buf, GET_DESCRIPTOR_BUFSIZE, | |
fd7c519d | 2551 | initial_descriptor_timeout); |
1da177e4 | 2552 | switch (buf->bMaxPacketSize0) { |
5bb6e0ae | 2553 | case 8: case 16: case 32: case 64: case 255: |
1da177e4 LT |
2554 | if (buf->bDescriptorType == |
2555 | USB_DT_DEVICE) { | |
2556 | r = 0; | |
2557 | break; | |
2558 | } | |
2559 | /* FALL THROUGH */ | |
2560 | default: | |
2561 | if (r == 0) | |
2562 | r = -EPROTO; | |
2563 | break; | |
2564 | } | |
2565 | if (r == 0) | |
2566 | break; | |
2567 | } | |
2568 | udev->descriptor.bMaxPacketSize0 = | |
2569 | buf->bMaxPacketSize0; | |
2570 | kfree(buf); | |
2571 | ||
2572 | retval = hub_port_reset(hub, port1, udev, delay); | |
2573 | if (retval < 0) /* error or disconnect */ | |
2574 | goto fail; | |
2575 | if (oldspeed != udev->speed) { | |
2576 | dev_dbg(&udev->dev, | |
2577 | "device reset changed speed!\n"); | |
2578 | retval = -ENODEV; | |
2579 | goto fail; | |
2580 | } | |
2581 | if (r) { | |
2582 | dev_err(&udev->dev, "device descriptor " | |
2583 | "read/%s, error %d\n", | |
2584 | "64", r); | |
2585 | retval = -EMSGSIZE; | |
2586 | continue; | |
2587 | } | |
2588 | #undef GET_DESCRIPTOR_BUFSIZE | |
2589 | } | |
2590 | ||
6c529cdc IPG |
2591 | /* |
2592 | * If device is WUSB, we already assigned an | |
2593 | * unauthorized address in the Connect Ack sequence; | |
2594 | * authorization will assign the final address. | |
2595 | */ | |
2596 | if (udev->wusb == 0) { | |
2597 | for (j = 0; j < SET_ADDRESS_TRIES; ++j) { | |
2598 | retval = hub_set_address(udev, devnum); | |
2599 | if (retval >= 0) | |
2600 | break; | |
2601 | msleep(200); | |
2602 | } | |
2603 | if (retval < 0) { | |
2604 | dev_err(&udev->dev, | |
2605 | "device not accepting address %d, error %d\n", | |
2606 | devnum, retval); | |
2607 | goto fail; | |
2608 | } | |
2609 | ||
2610 | /* cope with hardware quirkiness: | |
2611 | * - let SET_ADDRESS settle, some device hardware wants it | |
2612 | * - read ep0 maxpacket even for high and low speed, | |
2613 | */ | |
2614 | msleep(10); | |
2615 | if (USE_NEW_SCHEME(retry_counter)) | |
1da177e4 | 2616 | break; |
6c529cdc | 2617 | } |
1da177e4 LT |
2618 | |
2619 | retval = usb_get_device_descriptor(udev, 8); | |
2620 | if (retval < 8) { | |
2621 | dev_err(&udev->dev, "device descriptor " | |
2622 | "read/%s, error %d\n", | |
2623 | "8", retval); | |
2624 | if (retval >= 0) | |
2625 | retval = -EMSGSIZE; | |
2626 | } else { | |
2627 | retval = 0; | |
2628 | break; | |
2629 | } | |
2630 | } | |
2631 | if (retval) | |
2632 | goto fail; | |
2633 | ||
6c529cdc | 2634 | i = udev->descriptor.bMaxPacketSize0 == 0xff? /* wusb device? */ |
5bb6e0ae | 2635 | 512 : udev->descriptor.bMaxPacketSize0; |
1da177e4 LT |
2636 | if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { |
2637 | if (udev->speed != USB_SPEED_FULL || | |
2638 | !(i == 8 || i == 16 || i == 32 || i == 64)) { | |
2639 | dev_err(&udev->dev, "ep0 maxpacket = %d\n", i); | |
2640 | retval = -EMSGSIZE; | |
2641 | goto fail; | |
2642 | } | |
2643 | dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); | |
2644 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); | |
fc721f51 | 2645 | usb_ep0_reinit(udev); |
1da177e4 LT |
2646 | } |
2647 | ||
2648 | retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); | |
2649 | if (retval < (signed)sizeof(udev->descriptor)) { | |
2650 | dev_err(&udev->dev, "device descriptor read/%s, error %d\n", | |
2651 | "all", retval); | |
2652 | if (retval >= 0) | |
2653 | retval = -ENOMSG; | |
2654 | goto fail; | |
2655 | } | |
2656 | ||
2657 | retval = 0; | |
2658 | ||
2659 | fail: | |
4326ed0b | 2660 | if (retval) { |
1da177e4 | 2661 | hub_port_disable(hub, port1, 0); |
4953d141 | 2662 | update_address(udev, devnum); /* for disconnect processing */ |
4326ed0b | 2663 | } |
4186ecf8 | 2664 | mutex_unlock(&usb_address0_mutex); |
1da177e4 LT |
2665 | return retval; |
2666 | } | |
2667 | ||
2668 | static void | |
2669 | check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) | |
2670 | { | |
2671 | struct usb_qualifier_descriptor *qual; | |
2672 | int status; | |
2673 | ||
e94b1766 | 2674 | qual = kmalloc (sizeof *qual, GFP_KERNEL); |
1da177e4 LT |
2675 | if (qual == NULL) |
2676 | return; | |
2677 | ||
2678 | status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, | |
2679 | qual, sizeof *qual); | |
2680 | if (status == sizeof *qual) { | |
2681 | dev_info(&udev->dev, "not running at top speed; " | |
2682 | "connect to a high speed hub\n"); | |
2683 | /* hub LEDs are probably harder to miss than syslog */ | |
2684 | if (hub->has_indicators) { | |
2685 | hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; | |
c4028958 | 2686 | schedule_delayed_work (&hub->leds, 0); |
1da177e4 LT |
2687 | } |
2688 | } | |
1bc3c9e1 | 2689 | kfree(qual); |
1da177e4 LT |
2690 | } |
2691 | ||
2692 | static unsigned | |
2693 | hub_power_remaining (struct usb_hub *hub) | |
2694 | { | |
2695 | struct usb_device *hdev = hub->hdev; | |
2696 | int remaining; | |
55c52718 | 2697 | int port1; |
1da177e4 | 2698 | |
55c52718 | 2699 | if (!hub->limited_power) |
1da177e4 LT |
2700 | return 0; |
2701 | ||
55c52718 AS |
2702 | remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; |
2703 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
2704 | struct usb_device *udev = hdev->children[port1 - 1]; | |
2705 | int delta; | |
1da177e4 LT |
2706 | |
2707 | if (!udev) | |
2708 | continue; | |
2709 | ||
55c52718 AS |
2710 | /* Unconfigured devices may not use more than 100mA, |
2711 | * or 8mA for OTG ports */ | |
1da177e4 | 2712 | if (udev->actconfig) |
55c52718 AS |
2713 | delta = udev->actconfig->desc.bMaxPower * 2; |
2714 | else if (port1 != udev->bus->otg_port || hdev->parent) | |
2715 | delta = 100; | |
1da177e4 | 2716 | else |
55c52718 AS |
2717 | delta = 8; |
2718 | if (delta > hub->mA_per_port) | |
2719 | dev_warn(&udev->dev, "%dmA is over %umA budget " | |
2720 | "for port %d!\n", | |
2721 | delta, hub->mA_per_port, port1); | |
1da177e4 LT |
2722 | remaining -= delta; |
2723 | } | |
2724 | if (remaining < 0) { | |
55c52718 AS |
2725 | dev_warn(hub->intfdev, "%dmA over power budget!\n", |
2726 | - remaining); | |
1da177e4 LT |
2727 | remaining = 0; |
2728 | } | |
2729 | return remaining; | |
2730 | } | |
2731 | ||
2732 | /* Handle physical or logical connection change events. | |
2733 | * This routine is called when: | |
2734 | * a port connection-change occurs; | |
2735 | * a port enable-change occurs (often caused by EMI); | |
742120c6 | 2736 | * usb_reset_and_verify_device() encounters changed descriptors (as from |
1da177e4 LT |
2737 | * a firmware download) |
2738 | * caller already locked the hub | |
2739 | */ | |
2740 | static void hub_port_connect_change(struct usb_hub *hub, int port1, | |
2741 | u16 portstatus, u16 portchange) | |
2742 | { | |
2743 | struct usb_device *hdev = hub->hdev; | |
2744 | struct device *hub_dev = hub->intfdev; | |
90da096e | 2745 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
24618b0c AS |
2746 | unsigned wHubCharacteristics = |
2747 | le16_to_cpu(hub->descriptor->wHubCharacteristics); | |
8808f00c | 2748 | struct usb_device *udev; |
1da177e4 | 2749 | int status, i; |
24618b0c | 2750 | |
1da177e4 LT |
2751 | dev_dbg (hub_dev, |
2752 | "port %d, status %04x, change %04x, %s\n", | |
2753 | port1, portstatus, portchange, portspeed (portstatus)); | |
2754 | ||
2755 | if (hub->has_indicators) { | |
2756 | set_port_led(hub, port1, HUB_LED_AUTO); | |
2757 | hub->indicator[port1-1] = INDICATOR_AUTO; | |
2758 | } | |
1da177e4 LT |
2759 | |
2760 | #ifdef CONFIG_USB_OTG | |
2761 | /* during HNP, don't repeat the debounce */ | |
2762 | if (hdev->bus->is_b_host) | |
24618b0c AS |
2763 | portchange &= ~(USB_PORT_STAT_C_CONNECTION | |
2764 | USB_PORT_STAT_C_ENABLE); | |
1da177e4 LT |
2765 | #endif |
2766 | ||
8808f00c AS |
2767 | /* Try to resuscitate an existing device */ |
2768 | udev = hdev->children[port1-1]; | |
2769 | if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && | |
2770 | udev->state != USB_STATE_NOTATTACHED) { | |
8808f00c AS |
2771 | usb_lock_device(udev); |
2772 | if (portstatus & USB_PORT_STAT_ENABLE) { | |
2773 | status = 0; /* Nothing to do */ | |
8808f00c AS |
2774 | |
2775 | #ifdef CONFIG_USB_SUSPEND | |
5257d97a AS |
2776 | } else if (udev->state == USB_STATE_SUSPENDED && |
2777 | udev->persist_enabled) { | |
8808f00c AS |
2778 | /* For a suspended device, treat this as a |
2779 | * remote wakeup event. | |
2780 | */ | |
2781 | if (udev->do_remote_wakeup) | |
2782 | status = remote_wakeup(udev); | |
2783 | ||
2784 | /* Otherwise leave it be; devices can't tell the | |
2785 | * difference between suspended and disabled. | |
2786 | */ | |
2787 | else | |
2788 | status = 0; | |
2789 | #endif | |
2790 | ||
2791 | } else { | |
5257d97a | 2792 | status = -ENODEV; /* Don't resuscitate */ |
8808f00c AS |
2793 | } |
2794 | usb_unlock_device(udev); | |
2795 | ||
2796 | if (status == 0) { | |
2797 | clear_bit(port1, hub->change_bits); | |
2798 | return; | |
2799 | } | |
2800 | } | |
2801 | ||
24618b0c | 2802 | /* Disconnect any existing devices under this port */ |
8808f00c | 2803 | if (udev) |
24618b0c AS |
2804 | usb_disconnect(&hdev->children[port1-1]); |
2805 | clear_bit(port1, hub->change_bits); | |
2806 | ||
5257d97a AS |
2807 | if (portchange & (USB_PORT_STAT_C_CONNECTION | |
2808 | USB_PORT_STAT_C_ENABLE)) { | |
2809 | status = hub_port_debounce(hub, port1); | |
2810 | if (status < 0) { | |
2811 | if (printk_ratelimit()) | |
2812 | dev_err(hub_dev, "connect-debounce failed, " | |
2813 | "port %d disabled\n", port1); | |
2814 | portstatus &= ~USB_PORT_STAT_CONNECTION; | |
2815 | } else { | |
2816 | portstatus = status; | |
2817 | } | |
2818 | } | |
2819 | ||
24618b0c | 2820 | /* Return now if debouncing failed or nothing is connected */ |
1da177e4 LT |
2821 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) { |
2822 | ||
2823 | /* maybe switch power back on (e.g. root hub was reset) */ | |
74ad9bd2 | 2824 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 |
1da177e4 LT |
2825 | && !(portstatus & (1 << USB_PORT_FEAT_POWER))) |
2826 | set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); | |
5257d97a | 2827 | |
1da177e4 LT |
2828 | if (portstatus & USB_PORT_STAT_ENABLE) |
2829 | goto done; | |
2830 | return; | |
2831 | } | |
2832 | ||
1da177e4 | 2833 | for (i = 0; i < SET_CONFIG_TRIES; i++) { |
1da177e4 LT |
2834 | |
2835 | /* reallocate for each attempt, since references | |
2836 | * to the previous one can escape in various ways | |
2837 | */ | |
2838 | udev = usb_alloc_dev(hdev, hdev->bus, port1); | |
2839 | if (!udev) { | |
2840 | dev_err (hub_dev, | |
2841 | "couldn't allocate port %d usb_device\n", | |
2842 | port1); | |
2843 | goto done; | |
2844 | } | |
2845 | ||
2846 | usb_set_device_state(udev, USB_STATE_POWERED); | |
2847 | udev->speed = USB_SPEED_UNKNOWN; | |
55c52718 | 2848 | udev->bus_mA = hub->mA_per_port; |
b6956ffa | 2849 | udev->level = hdev->level + 1; |
8af548dc | 2850 | udev->wusb = hub_is_wusb(hub); |
55c52718 | 2851 | |
1da177e4 LT |
2852 | /* set the address */ |
2853 | choose_address(udev); | |
2854 | if (udev->devnum <= 0) { | |
2855 | status = -ENOTCONN; /* Don't retry */ | |
2856 | goto loop; | |
2857 | } | |
2858 | ||
2859 | /* reset and get descriptor */ | |
2860 | status = hub_port_init(hub, udev, port1, i); | |
2861 | if (status < 0) | |
2862 | goto loop; | |
2863 | ||
2864 | /* consecutive bus-powered hubs aren't reliable; they can | |
2865 | * violate the voltage drop budget. if the new child has | |
2866 | * a "powered" LED, users should notice we didn't enable it | |
2867 | * (without reading syslog), even without per-port LEDs | |
2868 | * on the parent. | |
2869 | */ | |
2870 | if (udev->descriptor.bDeviceClass == USB_CLASS_HUB | |
55c52718 | 2871 | && udev->bus_mA <= 100) { |
1da177e4 LT |
2872 | u16 devstat; |
2873 | ||
2874 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, | |
2875 | &devstat); | |
55c52718 | 2876 | if (status < 2) { |
1da177e4 LT |
2877 | dev_dbg(&udev->dev, "get status %d ?\n", status); |
2878 | goto loop_disable; | |
2879 | } | |
55c52718 | 2880 | le16_to_cpus(&devstat); |
1da177e4 LT |
2881 | if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
2882 | dev_err(&udev->dev, | |
2883 | "can't connect bus-powered hub " | |
2884 | "to this port\n"); | |
2885 | if (hub->has_indicators) { | |
2886 | hub->indicator[port1-1] = | |
2887 | INDICATOR_AMBER_BLINK; | |
c4028958 | 2888 | schedule_delayed_work (&hub->leds, 0); |
1da177e4 LT |
2889 | } |
2890 | status = -ENOTCONN; /* Don't retry */ | |
2891 | goto loop_disable; | |
2892 | } | |
2893 | } | |
2894 | ||
2895 | /* check for devices running slower than they could */ | |
2896 | if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 | |
2897 | && udev->speed == USB_SPEED_FULL | |
2898 | && highspeed_hubs != 0) | |
2899 | check_highspeed (hub, udev, port1); | |
2900 | ||
2901 | /* Store the parent's children[] pointer. At this point | |
2902 | * udev becomes globally accessible, although presumably | |
2903 | * no one will look at it until hdev is unlocked. | |
2904 | */ | |
1da177e4 LT |
2905 | status = 0; |
2906 | ||
2907 | /* We mustn't add new devices if the parent hub has | |
2908 | * been disconnected; we would race with the | |
2909 | * recursively_mark_NOTATTACHED() routine. | |
2910 | */ | |
2911 | spin_lock_irq(&device_state_lock); | |
2912 | if (hdev->state == USB_STATE_NOTATTACHED) | |
2913 | status = -ENOTCONN; | |
2914 | else | |
2915 | hdev->children[port1-1] = udev; | |
2916 | spin_unlock_irq(&device_state_lock); | |
2917 | ||
2918 | /* Run it through the hoops (find a driver, etc) */ | |
2919 | if (!status) { | |
2920 | status = usb_new_device(udev); | |
2921 | if (status) { | |
2922 | spin_lock_irq(&device_state_lock); | |
2923 | hdev->children[port1-1] = NULL; | |
2924 | spin_unlock_irq(&device_state_lock); | |
2925 | } | |
2926 | } | |
2927 | ||
1da177e4 LT |
2928 | if (status) |
2929 | goto loop_disable; | |
2930 | ||
2931 | status = hub_power_remaining(hub); | |
2932 | if (status) | |
55c52718 | 2933 | dev_dbg(hub_dev, "%dmA power budget left\n", status); |
1da177e4 LT |
2934 | |
2935 | return; | |
2936 | ||
2937 | loop_disable: | |
2938 | hub_port_disable(hub, port1, 1); | |
2939 | loop: | |
fc721f51 | 2940 | usb_ep0_reinit(udev); |
1da177e4 LT |
2941 | release_address(udev); |
2942 | usb_put_dev(udev); | |
ffcdc18d | 2943 | if ((status == -ENOTCONN) || (status == -ENOTSUPP)) |
1da177e4 LT |
2944 | break; |
2945 | } | |
3a31155c AS |
2946 | if (hub->hdev->parent || |
2947 | !hcd->driver->port_handed_over || | |
2948 | !(hcd->driver->port_handed_over)(hcd, port1)) | |
2949 | dev_err(hub_dev, "unable to enumerate USB device on port %d\n", | |
2950 | port1); | |
1da177e4 LT |
2951 | |
2952 | done: | |
2953 | hub_port_disable(hub, port1, 1); | |
90da096e BR |
2954 | if (hcd->driver->relinquish_port && !hub->hdev->parent) |
2955 | hcd->driver->relinquish_port(hcd, port1); | |
1da177e4 LT |
2956 | } |
2957 | ||
2958 | static void hub_events(void) | |
2959 | { | |
2960 | struct list_head *tmp; | |
2961 | struct usb_device *hdev; | |
2962 | struct usb_interface *intf; | |
2963 | struct usb_hub *hub; | |
2964 | struct device *hub_dev; | |
2965 | u16 hubstatus; | |
2966 | u16 hubchange; | |
2967 | u16 portstatus; | |
2968 | u16 portchange; | |
2969 | int i, ret; | |
2970 | int connect_change; | |
2971 | ||
2972 | /* | |
2973 | * We restart the list every time to avoid a deadlock with | |
2974 | * deleting hubs downstream from this one. This should be | |
2975 | * safe since we delete the hub from the event list. | |
2976 | * Not the most efficient, but avoids deadlocks. | |
2977 | */ | |
2978 | while (1) { | |
2979 | ||
2980 | /* Grab the first entry at the beginning of the list */ | |
2981 | spin_lock_irq(&hub_event_lock); | |
2982 | if (list_empty(&hub_event_list)) { | |
2983 | spin_unlock_irq(&hub_event_lock); | |
2984 | break; | |
2985 | } | |
2986 | ||
2987 | tmp = hub_event_list.next; | |
2988 | list_del_init(tmp); | |
2989 | ||
2990 | hub = list_entry(tmp, struct usb_hub, event_list); | |
e8054854 AS |
2991 | kref_get(&hub->kref); |
2992 | spin_unlock_irq(&hub_event_lock); | |
1da177e4 | 2993 | |
e8054854 AS |
2994 | hdev = hub->hdev; |
2995 | hub_dev = hub->intfdev; | |
2996 | intf = to_usb_interface(hub_dev); | |
40f122f3 | 2997 | dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", |
1da177e4 LT |
2998 | hdev->state, hub->descriptor |
2999 | ? hub->descriptor->bNbrPorts | |
3000 | : 0, | |
3001 | /* NOTE: expects max 15 ports... */ | |
3002 | (u16) hub->change_bits[0], | |
40f122f3 | 3003 | (u16) hub->event_bits[0]); |
1da177e4 | 3004 | |
1da177e4 LT |
3005 | /* Lock the device, then check to see if we were |
3006 | * disconnected while waiting for the lock to succeed. */ | |
06b84e8a | 3007 | usb_lock_device(hdev); |
e8054854 | 3008 | if (unlikely(hub->disconnected)) |
1da177e4 LT |
3009 | goto loop; |
3010 | ||
3011 | /* If the hub has died, clean up after it */ | |
3012 | if (hdev->state == USB_STATE_NOTATTACHED) { | |
7de18d8b | 3013 | hub->error = -ENODEV; |
4330354f | 3014 | hub_quiesce(hub, HUB_DISCONNECT); |
1da177e4 LT |
3015 | goto loop; |
3016 | } | |
3017 | ||
40f122f3 AS |
3018 | /* Autoresume */ |
3019 | ret = usb_autopm_get_interface(intf); | |
3020 | if (ret) { | |
3021 | dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); | |
3022 | goto loop; | |
3023 | } | |
a8e7c565 | 3024 | |
40f122f3 | 3025 | /* If this is an inactive hub, do nothing */ |
1da177e4 | 3026 | if (hub->quiescing) |
40f122f3 | 3027 | goto loop_autopm; |
1da177e4 LT |
3028 | |
3029 | if (hub->error) { | |
3030 | dev_dbg (hub_dev, "resetting for error %d\n", | |
3031 | hub->error); | |
3032 | ||
742120c6 | 3033 | ret = usb_reset_device(hdev); |
1da177e4 LT |
3034 | if (ret) { |
3035 | dev_dbg (hub_dev, | |
3036 | "error resetting hub: %d\n", ret); | |
40f122f3 | 3037 | goto loop_autopm; |
1da177e4 LT |
3038 | } |
3039 | ||
3040 | hub->nerrors = 0; | |
3041 | hub->error = 0; | |
3042 | } | |
3043 | ||
3044 | /* deal with port status changes */ | |
3045 | for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { | |
3046 | if (test_bit(i, hub->busy_bits)) | |
3047 | continue; | |
3048 | connect_change = test_bit(i, hub->change_bits); | |
3049 | if (!test_and_clear_bit(i, hub->event_bits) && | |
6ee0b270 | 3050 | !connect_change) |
1da177e4 LT |
3051 | continue; |
3052 | ||
3053 | ret = hub_port_status(hub, i, | |
3054 | &portstatus, &portchange); | |
3055 | if (ret < 0) | |
3056 | continue; | |
3057 | ||
1da177e4 LT |
3058 | if (portchange & USB_PORT_STAT_C_CONNECTION) { |
3059 | clear_port_feature(hdev, i, | |
3060 | USB_PORT_FEAT_C_CONNECTION); | |
3061 | connect_change = 1; | |
3062 | } | |
3063 | ||
3064 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
3065 | if (!connect_change) | |
3066 | dev_dbg (hub_dev, | |
3067 | "port %d enable change, " | |
3068 | "status %08x\n", | |
3069 | i, portstatus); | |
3070 | clear_port_feature(hdev, i, | |
3071 | USB_PORT_FEAT_C_ENABLE); | |
3072 | ||
3073 | /* | |
3074 | * EM interference sometimes causes badly | |
3075 | * shielded USB devices to be shutdown by | |
3076 | * the hub, this hack enables them again. | |
3077 | * Works at least with mouse driver. | |
3078 | */ | |
3079 | if (!(portstatus & USB_PORT_STAT_ENABLE) | |
3080 | && !connect_change | |
3081 | && hdev->children[i-1]) { | |
3082 | dev_err (hub_dev, | |
3083 | "port %i " | |
3084 | "disabled by hub (EMI?), " | |
3085 | "re-enabling...\n", | |
3086 | i); | |
3087 | connect_change = 1; | |
3088 | } | |
3089 | } | |
3090 | ||
3091 | if (portchange & USB_PORT_STAT_C_SUSPEND) { | |
8808f00c AS |
3092 | struct usb_device *udev; |
3093 | ||
1da177e4 LT |
3094 | clear_port_feature(hdev, i, |
3095 | USB_PORT_FEAT_C_SUSPEND); | |
8808f00c AS |
3096 | udev = hdev->children[i-1]; |
3097 | if (udev) { | |
3098 | usb_lock_device(udev); | |
1da177e4 LT |
3099 | ret = remote_wakeup(hdev-> |
3100 | children[i-1]); | |
8808f00c | 3101 | usb_unlock_device(udev); |
1da177e4 LT |
3102 | if (ret < 0) |
3103 | connect_change = 1; | |
3104 | } else { | |
3105 | ret = -ENODEV; | |
3106 | hub_port_disable(hub, i, 1); | |
3107 | } | |
3108 | dev_dbg (hub_dev, | |
3109 | "resume on port %d, status %d\n", | |
3110 | i, ret); | |
3111 | } | |
3112 | ||
3113 | if (portchange & USB_PORT_STAT_C_OVERCURRENT) { | |
3114 | dev_err (hub_dev, | |
3115 | "over-current change on port %d\n", | |
3116 | i); | |
3117 | clear_port_feature(hdev, i, | |
3118 | USB_PORT_FEAT_C_OVER_CURRENT); | |
8520f380 | 3119 | hub_power_on(hub, true); |
1da177e4 LT |
3120 | } |
3121 | ||
3122 | if (portchange & USB_PORT_STAT_C_RESET) { | |
3123 | dev_dbg (hub_dev, | |
3124 | "reset change on port %d\n", | |
3125 | i); | |
3126 | clear_port_feature(hdev, i, | |
3127 | USB_PORT_FEAT_C_RESET); | |
3128 | } | |
3129 | ||
3130 | if (connect_change) | |
3131 | hub_port_connect_change(hub, i, | |
3132 | portstatus, portchange); | |
3133 | } /* end for i */ | |
3134 | ||
3135 | /* deal with hub status changes */ | |
3136 | if (test_and_clear_bit(0, hub->event_bits) == 0) | |
3137 | ; /* do nothing */ | |
3138 | else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) | |
3139 | dev_err (hub_dev, "get_hub_status failed\n"); | |
3140 | else { | |
3141 | if (hubchange & HUB_CHANGE_LOCAL_POWER) { | |
3142 | dev_dbg (hub_dev, "power change\n"); | |
3143 | clear_hub_feature(hdev, C_HUB_LOCAL_POWER); | |
55c52718 AS |
3144 | if (hubstatus & HUB_STATUS_LOCAL_POWER) |
3145 | /* FIXME: Is this always true? */ | |
55c52718 | 3146 | hub->limited_power = 1; |
403fae78 | 3147 | else |
3148 | hub->limited_power = 0; | |
1da177e4 LT |
3149 | } |
3150 | if (hubchange & HUB_CHANGE_OVERCURRENT) { | |
3151 | dev_dbg (hub_dev, "overcurrent change\n"); | |
3152 | msleep(500); /* Cool down */ | |
3153 | clear_hub_feature(hdev, C_HUB_OVER_CURRENT); | |
8520f380 | 3154 | hub_power_on(hub, true); |
1da177e4 LT |
3155 | } |
3156 | } | |
3157 | ||
40f122f3 AS |
3158 | loop_autopm: |
3159 | /* Allow autosuspend if we're not going to run again */ | |
3160 | if (list_empty(&hub->event_list)) | |
3161 | usb_autopm_enable(intf); | |
1da177e4 LT |
3162 | loop: |
3163 | usb_unlock_device(hdev); | |
e8054854 | 3164 | kref_put(&hub->kref, hub_release); |
1da177e4 LT |
3165 | |
3166 | } /* end while (1) */ | |
3167 | } | |
3168 | ||
3169 | static int hub_thread(void *__unused) | |
3170 | { | |
3bb1af52 AS |
3171 | /* khubd needs to be freezable to avoid intefering with USB-PERSIST |
3172 | * port handover. Otherwise it might see that a full-speed device | |
3173 | * was gone before the EHCI controller had handed its port over to | |
3174 | * the companion full-speed controller. | |
3175 | */ | |
83144186 | 3176 | set_freezable(); |
3bb1af52 | 3177 | |
1da177e4 LT |
3178 | do { |
3179 | hub_events(); | |
e42837bc | 3180 | wait_event_freezable(khubd_wait, |
9c8d6178 | 3181 | !list_empty(&hub_event_list) || |
3182 | kthread_should_stop()); | |
9c8d6178 | 3183 | } while (!kthread_should_stop() || !list_empty(&hub_event_list)); |
1da177e4 | 3184 | |
9c8d6178 | 3185 | pr_debug("%s: khubd exiting\n", usbcore_name); |
3186 | return 0; | |
1da177e4 LT |
3187 | } |
3188 | ||
3189 | static struct usb_device_id hub_id_table [] = { | |
3190 | { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, | |
3191 | .bDeviceClass = USB_CLASS_HUB}, | |
3192 | { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, | |
3193 | .bInterfaceClass = USB_CLASS_HUB}, | |
3194 | { } /* Terminating entry */ | |
3195 | }; | |
3196 | ||
3197 | MODULE_DEVICE_TABLE (usb, hub_id_table); | |
3198 | ||
3199 | static struct usb_driver hub_driver = { | |
1da177e4 LT |
3200 | .name = "hub", |
3201 | .probe = hub_probe, | |
3202 | .disconnect = hub_disconnect, | |
3203 | .suspend = hub_suspend, | |
3204 | .resume = hub_resume, | |
f07600cf | 3205 | .reset_resume = hub_reset_resume, |
7de18d8b AS |
3206 | .pre_reset = hub_pre_reset, |
3207 | .post_reset = hub_post_reset, | |
1da177e4 LT |
3208 | .ioctl = hub_ioctl, |
3209 | .id_table = hub_id_table, | |
40f122f3 | 3210 | .supports_autosuspend = 1, |
1da177e4 LT |
3211 | }; |
3212 | ||
3213 | int usb_hub_init(void) | |
3214 | { | |
1da177e4 LT |
3215 | if (usb_register(&hub_driver) < 0) { |
3216 | printk(KERN_ERR "%s: can't register hub driver\n", | |
3217 | usbcore_name); | |
3218 | return -1; | |
3219 | } | |
3220 | ||
9c8d6178 | 3221 | khubd_task = kthread_run(hub_thread, NULL, "khubd"); |
3222 | if (!IS_ERR(khubd_task)) | |
1da177e4 | 3223 | return 0; |
1da177e4 LT |
3224 | |
3225 | /* Fall through if kernel_thread failed */ | |
3226 | usb_deregister(&hub_driver); | |
3227 | printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); | |
3228 | ||
3229 | return -1; | |
3230 | } | |
3231 | ||
3232 | void usb_hub_cleanup(void) | |
3233 | { | |
9c8d6178 | 3234 | kthread_stop(khubd_task); |
1da177e4 LT |
3235 | |
3236 | /* | |
3237 | * Hub resources are freed for us by usb_deregister. It calls | |
3238 | * usb_driver_purge on every device which in turn calls that | |
3239 | * devices disconnect function if it is using this driver. | |
3240 | * The hub_disconnect function takes care of releasing the | |
3241 | * individual hub resources. -greg | |
3242 | */ | |
3243 | usb_deregister(&hub_driver); | |
3244 | } /* usb_hub_cleanup() */ | |
3245 | ||
eb764c4b AS |
3246 | static int descriptors_changed(struct usb_device *udev, |
3247 | struct usb_device_descriptor *old_device_descriptor) | |
3248 | { | |
3249 | int changed = 0; | |
3250 | unsigned index; | |
3251 | unsigned serial_len = 0; | |
3252 | unsigned len; | |
3253 | unsigned old_length; | |
3254 | int length; | |
3255 | char *buf; | |
3256 | ||
3257 | if (memcmp(&udev->descriptor, old_device_descriptor, | |
3258 | sizeof(*old_device_descriptor)) != 0) | |
3259 | return 1; | |
3260 | ||
3261 | /* Since the idVendor, idProduct, and bcdDevice values in the | |
3262 | * device descriptor haven't changed, we will assume the | |
3263 | * Manufacturer and Product strings haven't changed either. | |
3264 | * But the SerialNumber string could be different (e.g., a | |
3265 | * different flash card of the same brand). | |
3266 | */ | |
3267 | if (udev->serial) | |
3268 | serial_len = strlen(udev->serial) + 1; | |
1da177e4 | 3269 | |
eb764c4b | 3270 | len = serial_len; |
1da177e4 | 3271 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
eb764c4b AS |
3272 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
3273 | len = max(len, old_length); | |
1da177e4 | 3274 | } |
eb764c4b | 3275 | |
0cc1a51f | 3276 | buf = kmalloc(len, GFP_NOIO); |
1da177e4 LT |
3277 | if (buf == NULL) { |
3278 | dev_err(&udev->dev, "no mem to re-read configs after reset\n"); | |
3279 | /* assume the worst */ | |
3280 | return 1; | |
3281 | } | |
3282 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { | |
eb764c4b | 3283 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
1da177e4 LT |
3284 | length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, |
3285 | old_length); | |
eb764c4b | 3286 | if (length != old_length) { |
1da177e4 LT |
3287 | dev_dbg(&udev->dev, "config index %d, error %d\n", |
3288 | index, length); | |
eb764c4b | 3289 | changed = 1; |
1da177e4 LT |
3290 | break; |
3291 | } | |
3292 | if (memcmp (buf, udev->rawdescriptors[index], old_length) | |
3293 | != 0) { | |
3294 | dev_dbg(&udev->dev, "config index %d changed (#%d)\n", | |
eb764c4b AS |
3295 | index, |
3296 | ((struct usb_config_descriptor *) buf)-> | |
3297 | bConfigurationValue); | |
3298 | changed = 1; | |
1da177e4 LT |
3299 | break; |
3300 | } | |
3301 | } | |
eb764c4b AS |
3302 | |
3303 | if (!changed && serial_len) { | |
3304 | length = usb_string(udev, udev->descriptor.iSerialNumber, | |
3305 | buf, serial_len); | |
3306 | if (length + 1 != serial_len) { | |
3307 | dev_dbg(&udev->dev, "serial string error %d\n", | |
3308 | length); | |
3309 | changed = 1; | |
3310 | } else if (memcmp(buf, udev->serial, length) != 0) { | |
3311 | dev_dbg(&udev->dev, "serial string changed\n"); | |
3312 | changed = 1; | |
3313 | } | |
3314 | } | |
3315 | ||
1da177e4 | 3316 | kfree(buf); |
eb764c4b | 3317 | return changed; |
1da177e4 LT |
3318 | } |
3319 | ||
3320 | /** | |
742120c6 | 3321 | * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device |
1da177e4 LT |
3322 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
3323 | * | |
79efa097 AS |
3324 | * WARNING - don't use this routine to reset a composite device |
3325 | * (one with multiple interfaces owned by separate drivers)! | |
742120c6 | 3326 | * Use usb_reset_device() instead. |
1da177e4 LT |
3327 | * |
3328 | * Do a port reset, reassign the device's address, and establish its | |
3329 | * former operating configuration. If the reset fails, or the device's | |
3330 | * descriptors change from their values before the reset, or the original | |
3331 | * configuration and altsettings cannot be restored, a flag will be set | |
3332 | * telling khubd to pretend the device has been disconnected and then | |
3333 | * re-connected. All drivers will be unbound, and the device will be | |
3334 | * re-enumerated and probed all over again. | |
3335 | * | |
3336 | * Returns 0 if the reset succeeded, -ENODEV if the device has been | |
3337 | * flagged for logical disconnection, or some other negative error code | |
3338 | * if the reset wasn't even attempted. | |
3339 | * | |
3340 | * The caller must own the device lock. For example, it's safe to use | |
3341 | * this from a driver probe() routine after downloading new firmware. | |
3342 | * For calls that might not occur during probe(), drivers should lock | |
3343 | * the device using usb_lock_device_for_reset(). | |
6bc6cff5 AS |
3344 | * |
3345 | * Locking exception: This routine may also be called from within an | |
3346 | * autoresume handler. Such usage won't conflict with other tasks | |
3347 | * holding the device lock because these tasks should always call | |
3348 | * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. | |
1da177e4 | 3349 | */ |
742120c6 | 3350 | static int usb_reset_and_verify_device(struct usb_device *udev) |
1da177e4 LT |
3351 | { |
3352 | struct usb_device *parent_hdev = udev->parent; | |
3353 | struct usb_hub *parent_hub; | |
3354 | struct usb_device_descriptor descriptor = udev->descriptor; | |
12c3da34 AS |
3355 | int i, ret = 0; |
3356 | int port1 = udev->portnum; | |
1da177e4 LT |
3357 | |
3358 | if (udev->state == USB_STATE_NOTATTACHED || | |
3359 | udev->state == USB_STATE_SUSPENDED) { | |
3360 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
3361 | udev->state); | |
3362 | return -EINVAL; | |
3363 | } | |
3364 | ||
3365 | if (!parent_hdev) { | |
3366 | /* this requires hcd-specific logic; see OHCI hc_restart() */ | |
441b62c1 | 3367 | dev_dbg(&udev->dev, "%s for root hub!\n", __func__); |
1da177e4 LT |
3368 | return -EISDIR; |
3369 | } | |
1da177e4 LT |
3370 | parent_hub = hdev_to_hub(parent_hdev); |
3371 | ||
1da177e4 LT |
3372 | set_bit(port1, parent_hub->busy_bits); |
3373 | for (i = 0; i < SET_CONFIG_TRIES; ++i) { | |
3374 | ||
3375 | /* ep0 maxpacket size may change; let the HCD know about it. | |
3376 | * Other endpoints will be handled by re-enumeration. */ | |
fc721f51 | 3377 | usb_ep0_reinit(udev); |
1da177e4 | 3378 | ret = hub_port_init(parent_hub, udev, port1, i); |
dd4dd19e | 3379 | if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) |
1da177e4 LT |
3380 | break; |
3381 | } | |
3382 | clear_bit(port1, parent_hub->busy_bits); | |
d5cbad4b | 3383 | |
1da177e4 LT |
3384 | if (ret < 0) |
3385 | goto re_enumerate; | |
3386 | ||
3387 | /* Device might have changed firmware (DFU or similar) */ | |
eb764c4b | 3388 | if (descriptors_changed(udev, &descriptor)) { |
1da177e4 LT |
3389 | dev_info(&udev->dev, "device firmware changed\n"); |
3390 | udev->descriptor = descriptor; /* for disconnect() calls */ | |
3391 | goto re_enumerate; | |
3392 | } | |
3393 | ||
3394 | if (!udev->actconfig) | |
3395 | goto done; | |
3396 | ||
3397 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3398 | USB_REQ_SET_CONFIGURATION, 0, | |
3399 | udev->actconfig->desc.bConfigurationValue, 0, | |
3400 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
3401 | if (ret < 0) { | |
3402 | dev_err(&udev->dev, | |
3403 | "can't restore configuration #%d (error=%d)\n", | |
3404 | udev->actconfig->desc.bConfigurationValue, ret); | |
3405 | goto re_enumerate; | |
3406 | } | |
3407 | usb_set_device_state(udev, USB_STATE_CONFIGURED); | |
3408 | ||
3409 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { | |
3410 | struct usb_interface *intf = udev->actconfig->interface[i]; | |
3411 | struct usb_interface_descriptor *desc; | |
3412 | ||
3413 | /* set_interface resets host side toggle even | |
3414 | * for altsetting zero. the interface may have no driver. | |
3415 | */ | |
3416 | desc = &intf->cur_altsetting->desc; | |
3417 | ret = usb_set_interface(udev, desc->bInterfaceNumber, | |
3418 | desc->bAlternateSetting); | |
3419 | if (ret < 0) { | |
3420 | dev_err(&udev->dev, "failed to restore interface %d " | |
3421 | "altsetting %d (error=%d)\n", | |
3422 | desc->bInterfaceNumber, | |
3423 | desc->bAlternateSetting, | |
3424 | ret); | |
3425 | goto re_enumerate; | |
3426 | } | |
3427 | } | |
3428 | ||
3429 | done: | |
1da177e4 LT |
3430 | return 0; |
3431 | ||
3432 | re_enumerate: | |
3433 | hub_port_logical_disconnect(parent_hub, port1); | |
3434 | return -ENODEV; | |
3435 | } | |
79efa097 AS |
3436 | |
3437 | /** | |
742120c6 | 3438 | * usb_reset_device - warn interface drivers and perform a USB port reset |
79efa097 | 3439 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
79efa097 AS |
3440 | * |
3441 | * Warns all drivers bound to registered interfaces (using their pre_reset | |
3442 | * method), performs the port reset, and then lets the drivers know that | |
3443 | * the reset is over (using their post_reset method). | |
3444 | * | |
742120c6 | 3445 | * Return value is the same as for usb_reset_and_verify_device(). |
79efa097 AS |
3446 | * |
3447 | * The caller must own the device lock. For example, it's safe to use | |
3448 | * this from a driver probe() routine after downloading new firmware. | |
3449 | * For calls that might not occur during probe(), drivers should lock | |
3450 | * the device using usb_lock_device_for_reset(). | |
78d9a487 AS |
3451 | * |
3452 | * If an interface is currently being probed or disconnected, we assume | |
3453 | * its driver knows how to handle resets. For all other interfaces, | |
3454 | * if the driver doesn't have pre_reset and post_reset methods then | |
3455 | * we attempt to unbind it and rebind afterward. | |
79efa097 | 3456 | */ |
742120c6 | 3457 | int usb_reset_device(struct usb_device *udev) |
79efa097 AS |
3458 | { |
3459 | int ret; | |
852c4b43 | 3460 | int i; |
79efa097 AS |
3461 | struct usb_host_config *config = udev->actconfig; |
3462 | ||
3463 | if (udev->state == USB_STATE_NOTATTACHED || | |
3464 | udev->state == USB_STATE_SUSPENDED) { | |
3465 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
3466 | udev->state); | |
3467 | return -EINVAL; | |
3468 | } | |
3469 | ||
645daaab | 3470 | /* Prevent autosuspend during the reset */ |
94fcda1f | 3471 | usb_autoresume_device(udev); |
645daaab | 3472 | |
79efa097 | 3473 | if (config) { |
79efa097 | 3474 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { |
852c4b43 AS |
3475 | struct usb_interface *cintf = config->interface[i]; |
3476 | struct usb_driver *drv; | |
78d9a487 | 3477 | int unbind = 0; |
852c4b43 AS |
3478 | |
3479 | if (cintf->dev.driver) { | |
79efa097 | 3480 | drv = to_usb_driver(cintf->dev.driver); |
78d9a487 AS |
3481 | if (drv->pre_reset && drv->post_reset) |
3482 | unbind = (drv->pre_reset)(cintf); | |
3483 | else if (cintf->condition == | |
3484 | USB_INTERFACE_BOUND) | |
3485 | unbind = 1; | |
3486 | if (unbind) | |
3487 | usb_forced_unbind_intf(cintf); | |
79efa097 AS |
3488 | } |
3489 | } | |
3490 | } | |
3491 | ||
742120c6 | 3492 | ret = usb_reset_and_verify_device(udev); |
79efa097 AS |
3493 | |
3494 | if (config) { | |
79efa097 | 3495 | for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { |
852c4b43 AS |
3496 | struct usb_interface *cintf = config->interface[i]; |
3497 | struct usb_driver *drv; | |
78d9a487 | 3498 | int rebind = cintf->needs_binding; |
852c4b43 | 3499 | |
78d9a487 | 3500 | if (!rebind && cintf->dev.driver) { |
79efa097 AS |
3501 | drv = to_usb_driver(cintf->dev.driver); |
3502 | if (drv->post_reset) | |
78d9a487 AS |
3503 | rebind = (drv->post_reset)(cintf); |
3504 | else if (cintf->condition == | |
3505 | USB_INTERFACE_BOUND) | |
3506 | rebind = 1; | |
79efa097 | 3507 | } |
6c640945 | 3508 | if (ret == 0 && rebind) |
78d9a487 | 3509 | usb_rebind_intf(cintf); |
79efa097 AS |
3510 | } |
3511 | } | |
3512 | ||
94fcda1f | 3513 | usb_autosuspend_device(udev); |
79efa097 AS |
3514 | return ret; |
3515 | } | |
742120c6 | 3516 | EXPORT_SYMBOL_GPL(usb_reset_device); |