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 LT |
25 | |
26 | #include <asm/semaphore.h> | |
27 | #include <asm/uaccess.h> | |
28 | #include <asm/byteorder.h> | |
29 | ||
30 | #include "usb.h" | |
31 | #include "hcd.h" | |
32 | #include "hub.h" | |
33 | ||
54515fe5 AS |
34 | #ifdef CONFIG_USB_PERSIST |
35 | #define USB_PERSIST 1 | |
36 | #else | |
37 | #define USB_PERSIST 0 | |
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; | |
75 | unsigned activating:1; | |
e8054854 | 76 | unsigned disconnected:1; |
1bb5f66b AS |
77 | |
78 | unsigned has_indicators:1; | |
79 | u8 indicator[USB_MAXCHILDREN]; | |
6d5aefb8 | 80 | struct delayed_work leds; |
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 | ||
103 | /* | |
104 | * As of 2.6.10 we introduce a new USB device initialization scheme which | |
105 | * closely resembles the way Windows works. Hopefully it will be compatible | |
106 | * with a wider range of devices than the old scheme. However some previously | |
107 | * working devices may start giving rise to "device not accepting address" | |
108 | * errors; if that happens the user can try the old scheme by adjusting the | |
109 | * following module parameters. | |
110 | * | |
111 | * For maximum flexibility there are two boolean parameters to control the | |
112 | * hub driver's behavior. On the first initialization attempt, if the | |
113 | * "old_scheme_first" parameter is set then the old scheme will be used, | |
114 | * otherwise the new scheme is used. If that fails and "use_both_schemes" | |
115 | * is set, then the driver will make another attempt, using the other scheme. | |
116 | */ | |
117 | static int old_scheme_first = 0; | |
118 | module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); | |
119 | MODULE_PARM_DESC(old_scheme_first, | |
120 | "start with the old device initialization scheme"); | |
121 | ||
122 | static int use_both_schemes = 1; | |
123 | module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); | |
124 | MODULE_PARM_DESC(use_both_schemes, | |
125 | "try the other device initialization scheme if the " | |
126 | "first one fails"); | |
127 | ||
128 | ||
404d5b18 | 129 | static inline char *portspeed(int portstatus) |
1da177e4 LT |
130 | { |
131 | if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED)) | |
132 | return "480 Mb/s"; | |
133 | else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED)) | |
134 | return "1.5 Mb/s"; | |
135 | else | |
136 | return "12 Mb/s"; | |
137 | } | |
1da177e4 LT |
138 | |
139 | /* Note that hdev or one of its children must be locked! */ | |
140 | static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev) | |
141 | { | |
142 | return usb_get_intfdata(hdev->actconfig->interface[0]); | |
143 | } | |
144 | ||
145 | /* USB 2.0 spec Section 11.24.4.5 */ | |
146 | static int get_hub_descriptor(struct usb_device *hdev, void *data, int size) | |
147 | { | |
148 | int i, ret; | |
149 | ||
150 | for (i = 0; i < 3; i++) { | |
151 | ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
152 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, | |
153 | USB_DT_HUB << 8, 0, data, size, | |
154 | USB_CTRL_GET_TIMEOUT); | |
155 | if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) | |
156 | return ret; | |
157 | } | |
158 | return -EINVAL; | |
159 | } | |
160 | ||
161 | /* | |
162 | * USB 2.0 spec Section 11.24.2.1 | |
163 | */ | |
164 | static int clear_hub_feature(struct usb_device *hdev, int feature) | |
165 | { | |
166 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
167 | USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); | |
168 | } | |
169 | ||
170 | /* | |
171 | * USB 2.0 spec Section 11.24.2.2 | |
172 | */ | |
173 | static int clear_port_feature(struct usb_device *hdev, int port1, int feature) | |
174 | { | |
175 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
176 | USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, | |
177 | NULL, 0, 1000); | |
178 | } | |
179 | ||
180 | /* | |
181 | * USB 2.0 spec Section 11.24.2.13 | |
182 | */ | |
183 | static int set_port_feature(struct usb_device *hdev, int port1, int feature) | |
184 | { | |
185 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
186 | USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, | |
187 | NULL, 0, 1000); | |
188 | } | |
189 | ||
190 | /* | |
191 | * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 | |
192 | * for info about using port indicators | |
193 | */ | |
194 | static void set_port_led( | |
195 | struct usb_hub *hub, | |
196 | int port1, | |
197 | int selector | |
198 | ) | |
199 | { | |
200 | int status = set_port_feature(hub->hdev, (selector << 8) | port1, | |
201 | USB_PORT_FEAT_INDICATOR); | |
202 | if (status < 0) | |
203 | dev_dbg (hub->intfdev, | |
204 | "port %d indicator %s status %d\n", | |
205 | port1, | |
206 | ({ char *s; switch (selector) { | |
207 | case HUB_LED_AMBER: s = "amber"; break; | |
208 | case HUB_LED_GREEN: s = "green"; break; | |
209 | case HUB_LED_OFF: s = "off"; break; | |
210 | case HUB_LED_AUTO: s = "auto"; break; | |
211 | default: s = "??"; break; | |
212 | }; s; }), | |
213 | status); | |
214 | } | |
215 | ||
216 | #define LED_CYCLE_PERIOD ((2*HZ)/3) | |
217 | ||
c4028958 | 218 | static void led_work (struct work_struct *work) |
1da177e4 | 219 | { |
c4028958 DH |
220 | struct usb_hub *hub = |
221 | container_of(work, struct usb_hub, leds.work); | |
1da177e4 LT |
222 | struct usb_device *hdev = hub->hdev; |
223 | unsigned i; | |
224 | unsigned changed = 0; | |
225 | int cursor = -1; | |
226 | ||
227 | if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) | |
228 | return; | |
229 | ||
230 | for (i = 0; i < hub->descriptor->bNbrPorts; i++) { | |
231 | unsigned selector, mode; | |
232 | ||
233 | /* 30%-50% duty cycle */ | |
234 | ||
235 | switch (hub->indicator[i]) { | |
236 | /* cycle marker */ | |
237 | case INDICATOR_CYCLE: | |
238 | cursor = i; | |
239 | selector = HUB_LED_AUTO; | |
240 | mode = INDICATOR_AUTO; | |
241 | break; | |
242 | /* blinking green = sw attention */ | |
243 | case INDICATOR_GREEN_BLINK: | |
244 | selector = HUB_LED_GREEN; | |
245 | mode = INDICATOR_GREEN_BLINK_OFF; | |
246 | break; | |
247 | case INDICATOR_GREEN_BLINK_OFF: | |
248 | selector = HUB_LED_OFF; | |
249 | mode = INDICATOR_GREEN_BLINK; | |
250 | break; | |
251 | /* blinking amber = hw attention */ | |
252 | case INDICATOR_AMBER_BLINK: | |
253 | selector = HUB_LED_AMBER; | |
254 | mode = INDICATOR_AMBER_BLINK_OFF; | |
255 | break; | |
256 | case INDICATOR_AMBER_BLINK_OFF: | |
257 | selector = HUB_LED_OFF; | |
258 | mode = INDICATOR_AMBER_BLINK; | |
259 | break; | |
260 | /* blink green/amber = reserved */ | |
261 | case INDICATOR_ALT_BLINK: | |
262 | selector = HUB_LED_GREEN; | |
263 | mode = INDICATOR_ALT_BLINK_OFF; | |
264 | break; | |
265 | case INDICATOR_ALT_BLINK_OFF: | |
266 | selector = HUB_LED_AMBER; | |
267 | mode = INDICATOR_ALT_BLINK; | |
268 | break; | |
269 | default: | |
270 | continue; | |
271 | } | |
272 | if (selector != HUB_LED_AUTO) | |
273 | changed = 1; | |
274 | set_port_led(hub, i + 1, selector); | |
275 | hub->indicator[i] = mode; | |
276 | } | |
277 | if (!changed && blinkenlights) { | |
278 | cursor++; | |
279 | cursor %= hub->descriptor->bNbrPorts; | |
280 | set_port_led(hub, cursor + 1, HUB_LED_GREEN); | |
281 | hub->indicator[cursor] = INDICATOR_CYCLE; | |
282 | changed++; | |
283 | } | |
284 | if (changed) | |
285 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); | |
286 | } | |
287 | ||
288 | /* use a short timeout for hub/port status fetches */ | |
289 | #define USB_STS_TIMEOUT 1000 | |
290 | #define USB_STS_RETRIES 5 | |
291 | ||
292 | /* | |
293 | * USB 2.0 spec Section 11.24.2.6 | |
294 | */ | |
295 | static int get_hub_status(struct usb_device *hdev, | |
296 | struct usb_hub_status *data) | |
297 | { | |
298 | int i, status = -ETIMEDOUT; | |
299 | ||
300 | for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { | |
301 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
302 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, | |
303 | data, sizeof(*data), USB_STS_TIMEOUT); | |
304 | } | |
305 | return status; | |
306 | } | |
307 | ||
308 | /* | |
309 | * USB 2.0 spec Section 11.24.2.7 | |
310 | */ | |
311 | static int get_port_status(struct usb_device *hdev, int port1, | |
312 | struct usb_port_status *data) | |
313 | { | |
314 | int i, status = -ETIMEDOUT; | |
315 | ||
316 | for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { | |
317 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
318 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, | |
319 | data, sizeof(*data), USB_STS_TIMEOUT); | |
320 | } | |
321 | return status; | |
322 | } | |
323 | ||
324 | static void kick_khubd(struct usb_hub *hub) | |
325 | { | |
326 | unsigned long flags; | |
327 | ||
40f122f3 AS |
328 | /* Suppress autosuspend until khubd runs */ |
329 | to_usb_interface(hub->intfdev)->pm_usage_cnt = 1; | |
330 | ||
1da177e4 | 331 | spin_lock_irqsave(&hub_event_lock, flags); |
e8054854 | 332 | if (!hub->disconnected & list_empty(&hub->event_list)) { |
1da177e4 LT |
333 | list_add_tail(&hub->event_list, &hub_event_list); |
334 | wake_up(&khubd_wait); | |
335 | } | |
336 | spin_unlock_irqrestore(&hub_event_lock, flags); | |
337 | } | |
338 | ||
339 | void usb_kick_khubd(struct usb_device *hdev) | |
340 | { | |
e8054854 | 341 | /* FIXME: What if hdev isn't bound to the hub driver? */ |
1da177e4 LT |
342 | kick_khubd(hdev_to_hub(hdev)); |
343 | } | |
344 | ||
345 | ||
346 | /* completion function, fires on port status changes and various faults */ | |
7d12e780 | 347 | static void hub_irq(struct urb *urb) |
1da177e4 | 348 | { |
ec17cf1c | 349 | struct usb_hub *hub = urb->context; |
1da177e4 LT |
350 | int status; |
351 | int i; | |
352 | unsigned long bits; | |
353 | ||
354 | switch (urb->status) { | |
355 | case -ENOENT: /* synchronous unlink */ | |
356 | case -ECONNRESET: /* async unlink */ | |
357 | case -ESHUTDOWN: /* hardware going away */ | |
358 | return; | |
359 | ||
360 | default: /* presumably an error */ | |
361 | /* Cause a hub reset after 10 consecutive errors */ | |
362 | dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status); | |
363 | if ((++hub->nerrors < 10) || hub->error) | |
364 | goto resubmit; | |
365 | hub->error = urb->status; | |
366 | /* FALL THROUGH */ | |
ec17cf1c | 367 | |
1da177e4 LT |
368 | /* let khubd handle things */ |
369 | case 0: /* we got data: port status changed */ | |
370 | bits = 0; | |
371 | for (i = 0; i < urb->actual_length; ++i) | |
372 | bits |= ((unsigned long) ((*hub->buffer)[i])) | |
373 | << (i*8); | |
374 | hub->event_bits[0] = bits; | |
375 | break; | |
376 | } | |
377 | ||
378 | hub->nerrors = 0; | |
379 | ||
380 | /* Something happened, let khubd figure it out */ | |
381 | kick_khubd(hub); | |
382 | ||
383 | resubmit: | |
384 | if (hub->quiescing) | |
385 | return; | |
386 | ||
387 | if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 | |
388 | && status != -ENODEV && status != -EPERM) | |
389 | dev_err (hub->intfdev, "resubmit --> %d\n", status); | |
390 | } | |
391 | ||
392 | /* USB 2.0 spec Section 11.24.2.3 */ | |
393 | static inline int | |
394 | hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) | |
395 | { | |
396 | return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
397 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, | |
398 | tt, NULL, 0, 1000); | |
399 | } | |
400 | ||
401 | /* | |
402 | * enumeration blocks khubd for a long time. we use keventd instead, since | |
403 | * long blocking there is the exception, not the rule. accordingly, HCDs | |
404 | * talking to TTs must queue control transfers (not just bulk and iso), so | |
405 | * both can talk to the same hub concurrently. | |
406 | */ | |
c4028958 | 407 | static void hub_tt_kevent (struct work_struct *work) |
1da177e4 | 408 | { |
c4028958 DH |
409 | struct usb_hub *hub = |
410 | container_of(work, struct usb_hub, tt.kevent); | |
1da177e4 | 411 | unsigned long flags; |
55e5fdfa | 412 | int limit = 100; |
1da177e4 LT |
413 | |
414 | spin_lock_irqsave (&hub->tt.lock, flags); | |
55e5fdfa | 415 | while (--limit && !list_empty (&hub->tt.clear_list)) { |
1da177e4 LT |
416 | struct list_head *temp; |
417 | struct usb_tt_clear *clear; | |
418 | struct usb_device *hdev = hub->hdev; | |
419 | int status; | |
420 | ||
421 | temp = hub->tt.clear_list.next; | |
422 | clear = list_entry (temp, struct usb_tt_clear, clear_list); | |
423 | list_del (&clear->clear_list); | |
424 | ||
425 | /* drop lock so HCD can concurrently report other TT errors */ | |
426 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
427 | status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); | |
428 | spin_lock_irqsave (&hub->tt.lock, flags); | |
429 | ||
430 | if (status) | |
431 | dev_err (&hdev->dev, | |
432 | "clear tt %d (%04x) error %d\n", | |
433 | clear->tt, clear->devinfo, status); | |
1bc3c9e1 | 434 | kfree(clear); |
1da177e4 LT |
435 | } |
436 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
437 | } | |
438 | ||
439 | /** | |
440 | * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub | |
441 | * @udev: the device whose split transaction failed | |
442 | * @pipe: identifies the endpoint of the failed transaction | |
443 | * | |
444 | * High speed HCDs use this to tell the hub driver that some split control or | |
445 | * bulk transaction failed in a way that requires clearing internal state of | |
446 | * a transaction translator. This is normally detected (and reported) from | |
447 | * interrupt context. | |
448 | * | |
449 | * It may not be possible for that hub to handle additional full (or low) | |
450 | * speed transactions until that state is fully cleared out. | |
451 | */ | |
452 | void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe) | |
453 | { | |
454 | struct usb_tt *tt = udev->tt; | |
455 | unsigned long flags; | |
456 | struct usb_tt_clear *clear; | |
457 | ||
458 | /* we've got to cope with an arbitrary number of pending TT clears, | |
459 | * since each TT has "at least two" buffers that can need it (and | |
460 | * there can be many TTs per hub). even if they're uncommon. | |
461 | */ | |
54e6ecb2 | 462 | if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { |
1da177e4 LT |
463 | dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); |
464 | /* FIXME recover somehow ... RESET_TT? */ | |
465 | return; | |
466 | } | |
467 | ||
468 | /* info that CLEAR_TT_BUFFER needs */ | |
469 | clear->tt = tt->multi ? udev->ttport : 1; | |
470 | clear->devinfo = usb_pipeendpoint (pipe); | |
471 | clear->devinfo |= udev->devnum << 4; | |
472 | clear->devinfo |= usb_pipecontrol (pipe) | |
473 | ? (USB_ENDPOINT_XFER_CONTROL << 11) | |
474 | : (USB_ENDPOINT_XFER_BULK << 11); | |
475 | if (usb_pipein (pipe)) | |
476 | clear->devinfo |= 1 << 15; | |
477 | ||
478 | /* tell keventd to clear state for this TT */ | |
479 | spin_lock_irqsave (&tt->lock, flags); | |
480 | list_add_tail (&clear->clear_list, &tt->clear_list); | |
481 | schedule_work (&tt->kevent); | |
482 | spin_unlock_irqrestore (&tt->lock, flags); | |
483 | } | |
484 | ||
485 | static void hub_power_on(struct usb_hub *hub) | |
486 | { | |
487 | int port1; | |
b789696a | 488 | unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; |
4489a571 AS |
489 | u16 wHubCharacteristics = |
490 | le16_to_cpu(hub->descriptor->wHubCharacteristics); | |
491 | ||
492 | /* Enable power on each port. Some hubs have reserved values | |
493 | * of LPSM (> 2) in their descriptors, even though they are | |
494 | * USB 2.0 hubs. Some hubs do not implement port-power switching | |
495 | * but only emulate it. In all cases, the ports won't work | |
496 | * unless we send these messages to the hub. | |
497 | */ | |
498 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) | |
1da177e4 | 499 | dev_dbg(hub->intfdev, "enabling power on all ports\n"); |
4489a571 AS |
500 | else |
501 | dev_dbg(hub->intfdev, "trying to enable port power on " | |
502 | "non-switchable hub\n"); | |
503 | for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) | |
504 | set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); | |
1da177e4 | 505 | |
b789696a DB |
506 | /* Wait at least 100 msec for power to become stable */ |
507 | msleep(max(pgood_delay, (unsigned) 100)); | |
1da177e4 LT |
508 | } |
509 | ||
02c399ee | 510 | static void hub_quiesce(struct usb_hub *hub) |
1da177e4 | 511 | { |
979d5199 | 512 | /* (nonblocking) khubd and related activity won't re-trigger */ |
1da177e4 | 513 | hub->quiescing = 1; |
c9f89fa4 | 514 | hub->activating = 0; |
979d5199 | 515 | |
979d5199 | 516 | /* (blocking) stop khubd and related activity */ |
1da177e4 LT |
517 | usb_kill_urb(hub->urb); |
518 | if (hub->has_indicators) | |
519 | cancel_delayed_work(&hub->leds); | |
520 | if (hub->has_indicators || hub->tt.hub) | |
521 | flush_scheduled_work(); | |
522 | } | |
523 | ||
524 | static void hub_activate(struct usb_hub *hub) | |
525 | { | |
526 | int status; | |
527 | ||
528 | hub->quiescing = 0; | |
529 | hub->activating = 1; | |
40f122f3 | 530 | |
1da177e4 LT |
531 | status = usb_submit_urb(hub->urb, GFP_NOIO); |
532 | if (status < 0) | |
533 | dev_err(hub->intfdev, "activate --> %d\n", status); | |
534 | if (hub->has_indicators && blinkenlights) | |
535 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); | |
536 | ||
537 | /* scan all ports ASAP */ | |
538 | kick_khubd(hub); | |
539 | } | |
540 | ||
541 | static int hub_hub_status(struct usb_hub *hub, | |
542 | u16 *status, u16 *change) | |
543 | { | |
544 | int ret; | |
545 | ||
db90e7a1 | 546 | mutex_lock(&hub->status_mutex); |
1da177e4 LT |
547 | ret = get_hub_status(hub->hdev, &hub->status->hub); |
548 | if (ret < 0) | |
549 | dev_err (hub->intfdev, | |
550 | "%s failed (err = %d)\n", __FUNCTION__, ret); | |
551 | else { | |
552 | *status = le16_to_cpu(hub->status->hub.wHubStatus); | |
553 | *change = le16_to_cpu(hub->status->hub.wHubChange); | |
554 | ret = 0; | |
555 | } | |
db90e7a1 | 556 | mutex_unlock(&hub->status_mutex); |
1da177e4 LT |
557 | return ret; |
558 | } | |
559 | ||
8b28c752 AS |
560 | static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) |
561 | { | |
562 | struct usb_device *hdev = hub->hdev; | |
0458d5b4 | 563 | int ret = 0; |
8b28c752 | 564 | |
0458d5b4 | 565 | if (hdev->children[port1-1] && set_state) |
8b28c752 AS |
566 | usb_set_device_state(hdev->children[port1-1], |
567 | USB_STATE_NOTATTACHED); | |
0458d5b4 AS |
568 | if (!hub->error) |
569 | ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); | |
8b28c752 AS |
570 | if (ret) |
571 | dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", | |
0458d5b4 | 572 | port1, ret); |
8b28c752 AS |
573 | return ret; |
574 | } | |
575 | ||
0458d5b4 AS |
576 | /* |
577 | * Disable a port and mark a logical connnect-change event, so that some | |
578 | * time later khubd will disconnect() any existing usb_device on the port | |
579 | * and will re-enumerate if there actually is a device attached. | |
580 | */ | |
581 | static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) | |
582 | { | |
583 | dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); | |
584 | hub_port_disable(hub, port1, 1); | |
7d069b7d | 585 | |
0458d5b4 AS |
586 | /* FIXME let caller ask to power down the port: |
587 | * - some devices won't enumerate without a VBUS power cycle | |
588 | * - SRP saves power that way | |
589 | * - ... new call, TBD ... | |
590 | * That's easy if this hub can switch power per-port, and | |
591 | * khubd reactivates the port later (timer, SRP, etc). | |
592 | * Powerdown must be optional, because of reset/DFU. | |
593 | */ | |
594 | ||
595 | set_bit(port1, hub->change_bits); | |
596 | kick_khubd(hub); | |
597 | } | |
598 | ||
0458d5b4 | 599 | /* caller has locked the hub device */ |
f07600cf | 600 | static int hub_pre_reset(struct usb_interface *intf) |
0458d5b4 AS |
601 | { |
602 | struct usb_hub *hub = usb_get_intfdata(intf); | |
b41a60ec AS |
603 | struct usb_device *hdev = hub->hdev; |
604 | int i; | |
0458d5b4 | 605 | |
b41a60ec AS |
606 | /* Disconnect all the children */ |
607 | for (i = 0; i < hdev->maxchild; ++i) { | |
608 | if (hdev->children[i]) | |
609 | usb_disconnect(&hdev->children[i]); | |
610 | } | |
7d069b7d | 611 | hub_quiesce(hub); |
f07600cf | 612 | return 0; |
7d069b7d AS |
613 | } |
614 | ||
615 | /* caller has locked the hub device */ | |
f07600cf | 616 | static int hub_post_reset(struct usb_interface *intf) |
7d069b7d | 617 | { |
7de18d8b AS |
618 | struct usb_hub *hub = usb_get_intfdata(intf); |
619 | ||
7d069b7d | 620 | hub_power_on(hub); |
0458d5b4 | 621 | hub_activate(hub); |
f07600cf | 622 | return 0; |
7d069b7d AS |
623 | } |
624 | ||
1da177e4 LT |
625 | static int hub_configure(struct usb_hub *hub, |
626 | struct usb_endpoint_descriptor *endpoint) | |
627 | { | |
628 | struct usb_device *hdev = hub->hdev; | |
629 | struct device *hub_dev = hub->intfdev; | |
630 | u16 hubstatus, hubchange; | |
74ad9bd2 | 631 | u16 wHubCharacteristics; |
1da177e4 LT |
632 | unsigned int pipe; |
633 | int maxp, ret; | |
634 | char *message; | |
635 | ||
636 | hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL, | |
637 | &hub->buffer_dma); | |
638 | if (!hub->buffer) { | |
639 | message = "can't allocate hub irq buffer"; | |
640 | ret = -ENOMEM; | |
641 | goto fail; | |
642 | } | |
643 | ||
644 | hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); | |
645 | if (!hub->status) { | |
646 | message = "can't kmalloc hub status buffer"; | |
647 | ret = -ENOMEM; | |
648 | goto fail; | |
649 | } | |
db90e7a1 | 650 | mutex_init(&hub->status_mutex); |
1da177e4 LT |
651 | |
652 | hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); | |
653 | if (!hub->descriptor) { | |
654 | message = "can't kmalloc hub descriptor"; | |
655 | ret = -ENOMEM; | |
656 | goto fail; | |
657 | } | |
658 | ||
659 | /* Request the entire hub descriptor. | |
660 | * hub->descriptor can handle USB_MAXCHILDREN ports, | |
661 | * but the hub can/will return fewer bytes here. | |
662 | */ | |
663 | ret = get_hub_descriptor(hdev, hub->descriptor, | |
664 | sizeof(*hub->descriptor)); | |
665 | if (ret < 0) { | |
666 | message = "can't read hub descriptor"; | |
667 | goto fail; | |
668 | } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { | |
669 | message = "hub has too many ports!"; | |
670 | ret = -ENODEV; | |
671 | goto fail; | |
672 | } | |
673 | ||
674 | hdev->maxchild = hub->descriptor->bNbrPorts; | |
675 | dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, | |
676 | (hdev->maxchild == 1) ? "" : "s"); | |
677 | ||
74ad9bd2 | 678 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
1da177e4 | 679 | |
74ad9bd2 | 680 | if (wHubCharacteristics & HUB_CHAR_COMPOUND) { |
1da177e4 LT |
681 | int i; |
682 | char portstr [USB_MAXCHILDREN + 1]; | |
683 | ||
684 | for (i = 0; i < hdev->maxchild; i++) | |
685 | portstr[i] = hub->descriptor->DeviceRemovable | |
686 | [((i + 1) / 8)] & (1 << ((i + 1) % 8)) | |
687 | ? 'F' : 'R'; | |
688 | portstr[hdev->maxchild] = 0; | |
689 | dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); | |
690 | } else | |
691 | dev_dbg(hub_dev, "standalone hub\n"); | |
692 | ||
74ad9bd2 | 693 | switch (wHubCharacteristics & HUB_CHAR_LPSM) { |
1da177e4 LT |
694 | case 0x00: |
695 | dev_dbg(hub_dev, "ganged power switching\n"); | |
696 | break; | |
697 | case 0x01: | |
698 | dev_dbg(hub_dev, "individual port power switching\n"); | |
699 | break; | |
700 | case 0x02: | |
701 | case 0x03: | |
702 | dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); | |
703 | break; | |
704 | } | |
705 | ||
74ad9bd2 | 706 | switch (wHubCharacteristics & HUB_CHAR_OCPM) { |
1da177e4 LT |
707 | case 0x00: |
708 | dev_dbg(hub_dev, "global over-current protection\n"); | |
709 | break; | |
710 | case 0x08: | |
711 | dev_dbg(hub_dev, "individual port over-current protection\n"); | |
712 | break; | |
713 | case 0x10: | |
714 | case 0x18: | |
715 | dev_dbg(hub_dev, "no over-current protection\n"); | |
716 | break; | |
717 | } | |
718 | ||
719 | spin_lock_init (&hub->tt.lock); | |
720 | INIT_LIST_HEAD (&hub->tt.clear_list); | |
c4028958 | 721 | INIT_WORK (&hub->tt.kevent, hub_tt_kevent); |
1da177e4 LT |
722 | switch (hdev->descriptor.bDeviceProtocol) { |
723 | case 0: | |
724 | break; | |
725 | case 1: | |
726 | dev_dbg(hub_dev, "Single TT\n"); | |
727 | hub->tt.hub = hdev; | |
728 | break; | |
729 | case 2: | |
730 | ret = usb_set_interface(hdev, 0, 1); | |
731 | if (ret == 0) { | |
732 | dev_dbg(hub_dev, "TT per port\n"); | |
733 | hub->tt.multi = 1; | |
734 | } else | |
735 | dev_err(hub_dev, "Using single TT (err %d)\n", | |
736 | ret); | |
737 | hub->tt.hub = hdev; | |
738 | break; | |
739 | default: | |
740 | dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", | |
741 | hdev->descriptor.bDeviceProtocol); | |
742 | break; | |
743 | } | |
744 | ||
e09711ae | 745 | /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ |
74ad9bd2 | 746 | switch (wHubCharacteristics & HUB_CHAR_TTTT) { |
e09711ae | 747 | case HUB_TTTT_8_BITS: |
748 | if (hdev->descriptor.bDeviceProtocol != 0) { | |
749 | hub->tt.think_time = 666; | |
750 | dev_dbg(hub_dev, "TT requires at most %d " | |
751 | "FS bit times (%d ns)\n", | |
752 | 8, hub->tt.think_time); | |
753 | } | |
1da177e4 | 754 | break; |
e09711ae | 755 | case HUB_TTTT_16_BITS: |
756 | hub->tt.think_time = 666 * 2; | |
757 | dev_dbg(hub_dev, "TT requires at most %d " | |
758 | "FS bit times (%d ns)\n", | |
759 | 16, hub->tt.think_time); | |
1da177e4 | 760 | break; |
e09711ae | 761 | case HUB_TTTT_24_BITS: |
762 | hub->tt.think_time = 666 * 3; | |
763 | dev_dbg(hub_dev, "TT requires at most %d " | |
764 | "FS bit times (%d ns)\n", | |
765 | 24, hub->tt.think_time); | |
1da177e4 | 766 | break; |
e09711ae | 767 | case HUB_TTTT_32_BITS: |
768 | hub->tt.think_time = 666 * 4; | |
769 | dev_dbg(hub_dev, "TT requires at most %d " | |
770 | "FS bit times (%d ns)\n", | |
771 | 32, hub->tt.think_time); | |
1da177e4 LT |
772 | break; |
773 | } | |
774 | ||
775 | /* probe() zeroes hub->indicator[] */ | |
74ad9bd2 | 776 | if (wHubCharacteristics & HUB_CHAR_PORTIND) { |
1da177e4 LT |
777 | hub->has_indicators = 1; |
778 | dev_dbg(hub_dev, "Port indicators are supported\n"); | |
779 | } | |
780 | ||
781 | dev_dbg(hub_dev, "power on to power good time: %dms\n", | |
782 | hub->descriptor->bPwrOn2PwrGood * 2); | |
783 | ||
784 | /* power budgeting mostly matters with bus-powered hubs, | |
785 | * and battery-powered root hubs (may provide just 8 mA). | |
786 | */ | |
787 | ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); | |
55c52718 | 788 | if (ret < 2) { |
1da177e4 LT |
789 | message = "can't get hub status"; |
790 | goto fail; | |
791 | } | |
7d35b929 AS |
792 | le16_to_cpus(&hubstatus); |
793 | if (hdev == hdev->bus->root_hub) { | |
55c52718 AS |
794 | if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) |
795 | hub->mA_per_port = 500; | |
796 | else { | |
797 | hub->mA_per_port = hdev->bus_mA; | |
798 | hub->limited_power = 1; | |
799 | } | |
7d35b929 | 800 | } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
1da177e4 LT |
801 | dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", |
802 | hub->descriptor->bHubContrCurrent); | |
55c52718 AS |
803 | hub->limited_power = 1; |
804 | if (hdev->maxchild > 0) { | |
805 | int remaining = hdev->bus_mA - | |
806 | hub->descriptor->bHubContrCurrent; | |
807 | ||
808 | if (remaining < hdev->maxchild * 100) | |
809 | dev_warn(hub_dev, | |
810 | "insufficient power available " | |
811 | "to use all downstream ports\n"); | |
812 | hub->mA_per_port = 100; /* 7.2.1.1 */ | |
813 | } | |
814 | } else { /* Self-powered external hub */ | |
815 | /* FIXME: What about battery-powered external hubs that | |
816 | * provide less current per port? */ | |
817 | hub->mA_per_port = 500; | |
7d35b929 | 818 | } |
55c52718 AS |
819 | if (hub->mA_per_port < 500) |
820 | dev_dbg(hub_dev, "%umA bus power budget for each child\n", | |
821 | hub->mA_per_port); | |
1da177e4 LT |
822 | |
823 | ret = hub_hub_status(hub, &hubstatus, &hubchange); | |
824 | if (ret < 0) { | |
825 | message = "can't get hub status"; | |
826 | goto fail; | |
827 | } | |
828 | ||
829 | /* local power status reports aren't always correct */ | |
830 | if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) | |
831 | dev_dbg(hub_dev, "local power source is %s\n", | |
832 | (hubstatus & HUB_STATUS_LOCAL_POWER) | |
833 | ? "lost (inactive)" : "good"); | |
834 | ||
74ad9bd2 | 835 | if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) |
1da177e4 LT |
836 | dev_dbg(hub_dev, "%sover-current condition exists\n", |
837 | (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); | |
838 | ||
88fafff9 | 839 | /* set up the interrupt endpoint |
840 | * We use the EP's maxpacket size instead of (PORTS+1+7)/8 | |
841 | * bytes as USB2.0[11.12.3] says because some hubs are known | |
842 | * to send more data (and thus cause overflow). For root hubs, | |
843 | * maxpktsize is defined in hcd.c's fake endpoint descriptors | |
844 | * to be big enough for at least USB_MAXCHILDREN ports. */ | |
1da177e4 LT |
845 | pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); |
846 | maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); | |
847 | ||
848 | if (maxp > sizeof(*hub->buffer)) | |
849 | maxp = sizeof(*hub->buffer); | |
850 | ||
851 | hub->urb = usb_alloc_urb(0, GFP_KERNEL); | |
852 | if (!hub->urb) { | |
853 | message = "couldn't allocate interrupt urb"; | |
854 | ret = -ENOMEM; | |
855 | goto fail; | |
856 | } | |
857 | ||
858 | usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, | |
859 | hub, endpoint->bInterval); | |
860 | hub->urb->transfer_dma = hub->buffer_dma; | |
861 | hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
862 | ||
863 | /* maybe cycle the hub leds */ | |
864 | if (hub->has_indicators && blinkenlights) | |
865 | hub->indicator [0] = INDICATOR_CYCLE; | |
866 | ||
867 | hub_power_on(hub); | |
868 | hub_activate(hub); | |
869 | return 0; | |
870 | ||
871 | fail: | |
872 | dev_err (hub_dev, "config failed, %s (err %d)\n", | |
873 | message, ret); | |
874 | /* hub_disconnect() frees urb and descriptor */ | |
875 | return ret; | |
876 | } | |
877 | ||
e8054854 AS |
878 | static void hub_release(struct kref *kref) |
879 | { | |
880 | struct usb_hub *hub = container_of(kref, struct usb_hub, kref); | |
881 | ||
882 | usb_put_intf(to_usb_interface(hub->intfdev)); | |
883 | kfree(hub); | |
884 | } | |
885 | ||
1da177e4 LT |
886 | static unsigned highspeed_hubs; |
887 | ||
888 | static void hub_disconnect(struct usb_interface *intf) | |
889 | { | |
890 | struct usb_hub *hub = usb_get_intfdata (intf); | |
e8054854 AS |
891 | |
892 | /* Take the hub off the event list and don't let it be added again */ | |
893 | spin_lock_irq(&hub_event_lock); | |
894 | list_del_init(&hub->event_list); | |
895 | hub->disconnected = 1; | |
896 | spin_unlock_irq(&hub_event_lock); | |
1da177e4 | 897 | |
7de18d8b AS |
898 | /* Disconnect all children and quiesce the hub */ |
899 | hub->error = 0; | |
900 | hub_pre_reset(intf); | |
901 | ||
8b28c752 | 902 | usb_set_intfdata (intf, NULL); |
1da177e4 | 903 | |
e8054854 | 904 | if (hub->hdev->speed == USB_SPEED_HIGH) |
1da177e4 LT |
905 | highspeed_hubs--; |
906 | ||
1da177e4 | 907 | usb_free_urb(hub->urb); |
1bc3c9e1 | 908 | kfree(hub->descriptor); |
1bc3c9e1 | 909 | kfree(hub->status); |
e8054854 AS |
910 | usb_buffer_free(hub->hdev, sizeof(*hub->buffer), hub->buffer, |
911 | hub->buffer_dma); | |
1da177e4 | 912 | |
e8054854 | 913 | kref_put(&hub->kref, hub_release); |
1da177e4 LT |
914 | } |
915 | ||
916 | static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
917 | { | |
918 | struct usb_host_interface *desc; | |
919 | struct usb_endpoint_descriptor *endpoint; | |
920 | struct usb_device *hdev; | |
921 | struct usb_hub *hub; | |
922 | ||
923 | desc = intf->cur_altsetting; | |
924 | hdev = interface_to_usbdev(intf); | |
925 | ||
89ccbdc9 DB |
926 | #ifdef CONFIG_USB_OTG_BLACKLIST_HUB |
927 | if (hdev->parent) { | |
928 | dev_warn(&intf->dev, "ignoring external hub\n"); | |
929 | return -ENODEV; | |
930 | } | |
931 | #endif | |
932 | ||
1da177e4 LT |
933 | /* Some hubs have a subclass of 1, which AFAICT according to the */ |
934 | /* specs is not defined, but it works */ | |
935 | if ((desc->desc.bInterfaceSubClass != 0) && | |
936 | (desc->desc.bInterfaceSubClass != 1)) { | |
937 | descriptor_error: | |
938 | dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); | |
939 | return -EIO; | |
940 | } | |
941 | ||
942 | /* Multiple endpoints? What kind of mutant ninja-hub is this? */ | |
943 | if (desc->desc.bNumEndpoints != 1) | |
944 | goto descriptor_error; | |
945 | ||
946 | endpoint = &desc->endpoint[0].desc; | |
947 | ||
fbf81c29 LFC |
948 | /* If it's not an interrupt in endpoint, we'd better punt! */ |
949 | if (!usb_endpoint_is_int_in(endpoint)) | |
1da177e4 LT |
950 | goto descriptor_error; |
951 | ||
952 | /* We found a hub */ | |
953 | dev_info (&intf->dev, "USB hub found\n"); | |
954 | ||
0a1ef3b5 | 955 | hub = kzalloc(sizeof(*hub), GFP_KERNEL); |
1da177e4 LT |
956 | if (!hub) { |
957 | dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); | |
958 | return -ENOMEM; | |
959 | } | |
960 | ||
e8054854 | 961 | kref_init(&hub->kref); |
1da177e4 LT |
962 | INIT_LIST_HEAD(&hub->event_list); |
963 | hub->intfdev = &intf->dev; | |
964 | hub->hdev = hdev; | |
c4028958 | 965 | INIT_DELAYED_WORK(&hub->leds, led_work); |
e8054854 | 966 | usb_get_intf(intf); |
1da177e4 LT |
967 | |
968 | usb_set_intfdata (intf, hub); | |
40f122f3 | 969 | intf->needs_remote_wakeup = 1; |
1da177e4 LT |
970 | |
971 | if (hdev->speed == USB_SPEED_HIGH) | |
972 | highspeed_hubs++; | |
973 | ||
974 | if (hub_configure(hub, endpoint) >= 0) | |
975 | return 0; | |
976 | ||
977 | hub_disconnect (intf); | |
978 | return -ENODEV; | |
979 | } | |
980 | ||
981 | static int | |
982 | hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) | |
983 | { | |
984 | struct usb_device *hdev = interface_to_usbdev (intf); | |
985 | ||
986 | /* assert ifno == 0 (part of hub spec) */ | |
987 | switch (code) { | |
988 | case USBDEVFS_HUB_PORTINFO: { | |
989 | struct usbdevfs_hub_portinfo *info = user_data; | |
990 | int i; | |
991 | ||
992 | spin_lock_irq(&device_state_lock); | |
993 | if (hdev->devnum <= 0) | |
994 | info->nports = 0; | |
995 | else { | |
996 | info->nports = hdev->maxchild; | |
997 | for (i = 0; i < info->nports; i++) { | |
998 | if (hdev->children[i] == NULL) | |
999 | info->port[i] = 0; | |
1000 | else | |
1001 | info->port[i] = | |
1002 | hdev->children[i]->devnum; | |
1003 | } | |
1004 | } | |
1005 | spin_unlock_irq(&device_state_lock); | |
1006 | ||
1007 | return info->nports + 1; | |
1008 | } | |
1009 | ||
1010 | default: | |
1011 | return -ENOSYS; | |
1012 | } | |
1013 | } | |
1014 | ||
1da177e4 | 1015 | |
1da177e4 LT |
1016 | static void recursively_mark_NOTATTACHED(struct usb_device *udev) |
1017 | { | |
1018 | int i; | |
1019 | ||
1020 | for (i = 0; i < udev->maxchild; ++i) { | |
1021 | if (udev->children[i]) | |
1022 | recursively_mark_NOTATTACHED(udev->children[i]); | |
1023 | } | |
ee49fb5d AS |
1024 | if (udev->state == USB_STATE_SUSPENDED) |
1025 | udev->discon_suspended = 1; | |
1da177e4 LT |
1026 | udev->state = USB_STATE_NOTATTACHED; |
1027 | } | |
1028 | ||
1029 | /** | |
1030 | * usb_set_device_state - change a device's current state (usbcore, hcds) | |
1031 | * @udev: pointer to device whose state should be changed | |
1032 | * @new_state: new state value to be stored | |
1033 | * | |
1034 | * udev->state is _not_ fully protected by the device lock. Although | |
1035 | * most transitions are made only while holding the lock, the state can | |
1036 | * can change to USB_STATE_NOTATTACHED at almost any time. This | |
1037 | * is so that devices can be marked as disconnected as soon as possible, | |
1038 | * without having to wait for any semaphores to be released. As a result, | |
1039 | * all changes to any device's state must be protected by the | |
1040 | * device_state_lock spinlock. | |
1041 | * | |
1042 | * Once a device has been added to the device tree, all changes to its state | |
1043 | * should be made using this routine. The state should _not_ be set directly. | |
1044 | * | |
1045 | * If udev->state is already USB_STATE_NOTATTACHED then no change is made. | |
1046 | * Otherwise udev->state is set to new_state, and if new_state is | |
1047 | * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set | |
1048 | * to USB_STATE_NOTATTACHED. | |
1049 | */ | |
1050 | void usb_set_device_state(struct usb_device *udev, | |
1051 | enum usb_device_state new_state) | |
1052 | { | |
1053 | unsigned long flags; | |
1054 | ||
1055 | spin_lock_irqsave(&device_state_lock, flags); | |
1056 | if (udev->state == USB_STATE_NOTATTACHED) | |
1057 | ; /* do nothing */ | |
b94dc6b5 | 1058 | else if (new_state != USB_STATE_NOTATTACHED) { |
fb669cc0 DB |
1059 | |
1060 | /* root hub wakeup capabilities are managed out-of-band | |
1061 | * and may involve silicon errata ... ignore them here. | |
1062 | */ | |
1063 | if (udev->parent) { | |
645daaab AS |
1064 | if (udev->state == USB_STATE_SUSPENDED |
1065 | || new_state == USB_STATE_SUSPENDED) | |
1066 | ; /* No change to wakeup settings */ | |
1067 | else if (new_state == USB_STATE_CONFIGURED) | |
fb669cc0 DB |
1068 | device_init_wakeup(&udev->dev, |
1069 | (udev->actconfig->desc.bmAttributes | |
1070 | & USB_CONFIG_ATT_WAKEUP)); | |
645daaab | 1071 | else |
fb669cc0 DB |
1072 | device_init_wakeup(&udev->dev, 0); |
1073 | } | |
645daaab | 1074 | udev->state = new_state; |
b94dc6b5 | 1075 | } else |
1da177e4 LT |
1076 | recursively_mark_NOTATTACHED(udev); |
1077 | spin_unlock_irqrestore(&device_state_lock, flags); | |
1078 | } | |
1da177e4 | 1079 | |
1da177e4 LT |
1080 | static void choose_address(struct usb_device *udev) |
1081 | { | |
1082 | int devnum; | |
1083 | struct usb_bus *bus = udev->bus; | |
1084 | ||
1085 | /* If khubd ever becomes multithreaded, this will need a lock */ | |
1086 | ||
1087 | /* Try to allocate the next devnum beginning at bus->devnum_next. */ | |
1088 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, | |
1089 | bus->devnum_next); | |
1090 | if (devnum >= 128) | |
1091 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1); | |
1092 | ||
1093 | bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); | |
1094 | ||
1095 | if (devnum < 128) { | |
1096 | set_bit(devnum, bus->devmap.devicemap); | |
1097 | udev->devnum = devnum; | |
1098 | } | |
1099 | } | |
1100 | ||
1101 | static void release_address(struct usb_device *udev) | |
1102 | { | |
1103 | if (udev->devnum > 0) { | |
1104 | clear_bit(udev->devnum, udev->bus->devmap.devicemap); | |
1105 | udev->devnum = -1; | |
1106 | } | |
1107 | } | |
1108 | ||
d5d4db70 AS |
1109 | #ifdef CONFIG_USB_SUSPEND |
1110 | ||
1111 | static void usb_stop_pm(struct usb_device *udev) | |
1112 | { | |
1113 | /* Synchronize with the ksuspend thread to prevent any more | |
1114 | * autosuspend requests from being submitted, and decrement | |
1115 | * the parent's count of unsuspended children. | |
1116 | */ | |
1117 | usb_pm_lock(udev); | |
1118 | if (udev->parent && !udev->discon_suspended) | |
1119 | usb_autosuspend_device(udev->parent); | |
1120 | usb_pm_unlock(udev); | |
1121 | ||
1122 | /* Stop any autosuspend requests already submitted */ | |
1123 | cancel_rearming_delayed_work(&udev->autosuspend); | |
1124 | } | |
1125 | ||
1126 | #else | |
1127 | ||
1128 | static inline void usb_stop_pm(struct usb_device *udev) | |
1129 | { } | |
1130 | ||
1131 | #endif | |
1132 | ||
1da177e4 LT |
1133 | /** |
1134 | * usb_disconnect - disconnect a device (usbcore-internal) | |
1135 | * @pdev: pointer to device being disconnected | |
1136 | * Context: !in_interrupt () | |
1137 | * | |
1138 | * Something got disconnected. Get rid of it and all of its children. | |
1139 | * | |
1140 | * If *pdev is a normal device then the parent hub must already be locked. | |
1141 | * If *pdev is a root hub then this routine will acquire the | |
1142 | * usb_bus_list_lock on behalf of the caller. | |
1143 | * | |
1144 | * Only hub drivers (including virtual root hub drivers for host | |
1145 | * controllers) should ever call this. | |
1146 | * | |
1147 | * This call is synchronous, and may not be used in an interrupt context. | |
1148 | */ | |
1149 | void usb_disconnect(struct usb_device **pdev) | |
1150 | { | |
1151 | struct usb_device *udev = *pdev; | |
1152 | int i; | |
1153 | ||
1154 | if (!udev) { | |
1155 | pr_debug ("%s nodev\n", __FUNCTION__); | |
1156 | return; | |
1157 | } | |
1158 | ||
1159 | /* mark the device as inactive, so any further urb submissions for | |
1160 | * this device (and any of its children) will fail immediately. | |
1161 | * this quiesces everyting except pending urbs. | |
1162 | */ | |
1163 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
1da177e4 LT |
1164 | dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum); |
1165 | ||
9ad3d6cc AS |
1166 | usb_lock_device(udev); |
1167 | ||
1da177e4 LT |
1168 | /* Free up all the children before we remove this device */ |
1169 | for (i = 0; i < USB_MAXCHILDREN; i++) { | |
1170 | if (udev->children[i]) | |
1171 | usb_disconnect(&udev->children[i]); | |
1172 | } | |
1173 | ||
1174 | /* deallocate hcd/hardware state ... nuking all pending urbs and | |
1175 | * cleaning up all state associated with the current configuration | |
1176 | * so that the hardware is now fully quiesced. | |
1177 | */ | |
782da727 | 1178 | dev_dbg (&udev->dev, "unregistering device\n"); |
1da177e4 LT |
1179 | usb_disable_device(udev, 0); |
1180 | ||
782da727 AS |
1181 | usb_unlock_device(udev); |
1182 | ||
1183 | /* Unregister the device. The device driver is responsible | |
1184 | * for removing the device files from usbfs and sysfs and for | |
1185 | * de-configuring the device. | |
1186 | */ | |
1187 | device_del(&udev->dev); | |
3099e75a | 1188 | |
782da727 | 1189 | /* Free the device number and delete the parent's children[] |
1da177e4 LT |
1190 | * (or root_hub) pointer. |
1191 | */ | |
1da177e4 | 1192 | release_address(udev); |
1da177e4 LT |
1193 | |
1194 | /* Avoid races with recursively_mark_NOTATTACHED() */ | |
1195 | spin_lock_irq(&device_state_lock); | |
1196 | *pdev = NULL; | |
1197 | spin_unlock_irq(&device_state_lock); | |
1198 | ||
d5d4db70 | 1199 | usb_stop_pm(udev); |
ee49fb5d | 1200 | |
782da727 | 1201 | put_device(&udev->dev); |
1da177e4 LT |
1202 | } |
1203 | ||
1204 | #ifdef DEBUG | |
1205 | static void show_string(struct usb_device *udev, char *id, char *string) | |
1206 | { | |
1207 | if (!string) | |
1208 | return; | |
1209 | dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); | |
1210 | } | |
1211 | ||
1212 | #else | |
1213 | static inline void show_string(struct usb_device *udev, char *id, char *string) | |
1214 | {} | |
1215 | #endif | |
1216 | ||
1da177e4 LT |
1217 | |
1218 | #ifdef CONFIG_USB_OTG | |
1219 | #include "otg_whitelist.h" | |
1220 | #endif | |
1221 | ||
3ede760f | 1222 | /** |
d9d16e8a | 1223 | * usb_configure_device_otg - FIXME (usbcore-internal) |
3ede760f ON |
1224 | * @udev: newly addressed device (in ADDRESS state) |
1225 | * | |
d9d16e8a | 1226 | * Do configuration for On-The-Go devices |
3ede760f | 1227 | */ |
d9d16e8a | 1228 | static int usb_configure_device_otg(struct usb_device *udev) |
1da177e4 | 1229 | { |
d9d16e8a | 1230 | int err = 0; |
1da177e4 LT |
1231 | |
1232 | #ifdef CONFIG_USB_OTG | |
1233 | /* | |
1234 | * OTG-aware devices on OTG-capable root hubs may be able to use SRP, | |
1235 | * to wake us after we've powered off VBUS; and HNP, switching roles | |
1236 | * "host" to "peripheral". The OTG descriptor helps figure this out. | |
1237 | */ | |
1238 | if (!udev->bus->is_b_host | |
1239 | && udev->config | |
1240 | && udev->parent == udev->bus->root_hub) { | |
1241 | struct usb_otg_descriptor *desc = 0; | |
1242 | struct usb_bus *bus = udev->bus; | |
1243 | ||
1244 | /* descriptor may appear anywhere in config */ | |
1245 | if (__usb_get_extra_descriptor (udev->rawdescriptors[0], | |
1246 | le16_to_cpu(udev->config[0].desc.wTotalLength), | |
1247 | USB_DT_OTG, (void **) &desc) == 0) { | |
1248 | if (desc->bmAttributes & USB_OTG_HNP) { | |
12c3da34 | 1249 | unsigned port1 = udev->portnum; |
fc849b85 | 1250 | |
1da177e4 LT |
1251 | dev_info(&udev->dev, |
1252 | "Dual-Role OTG device on %sHNP port\n", | |
1253 | (port1 == bus->otg_port) | |
1254 | ? "" : "non-"); | |
1255 | ||
1256 | /* enable HNP before suspend, it's simpler */ | |
1257 | if (port1 == bus->otg_port) | |
1258 | bus->b_hnp_enable = 1; | |
1259 | err = usb_control_msg(udev, | |
1260 | usb_sndctrlpipe(udev, 0), | |
1261 | USB_REQ_SET_FEATURE, 0, | |
1262 | bus->b_hnp_enable | |
1263 | ? USB_DEVICE_B_HNP_ENABLE | |
1264 | : USB_DEVICE_A_ALT_HNP_SUPPORT, | |
1265 | 0, NULL, 0, USB_CTRL_SET_TIMEOUT); | |
1266 | if (err < 0) { | |
1267 | /* OTG MESSAGE: report errors here, | |
1268 | * customize to match your product. | |
1269 | */ | |
1270 | dev_info(&udev->dev, | |
1271 | "can't set HNP mode; %d\n", | |
1272 | err); | |
1273 | bus->b_hnp_enable = 0; | |
1274 | } | |
1275 | } | |
1276 | } | |
1277 | } | |
1278 | ||
1279 | if (!is_targeted(udev)) { | |
1280 | ||
1281 | /* Maybe it can talk to us, though we can't talk to it. | |
1282 | * (Includes HNP test device.) | |
1283 | */ | |
1284 | if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { | |
4956eccd | 1285 | err = usb_port_suspend(udev); |
1da177e4 LT |
1286 | if (err < 0) |
1287 | dev_dbg(&udev->dev, "HNP fail, %d\n", err); | |
1288 | } | |
ffcdc18d | 1289 | err = -ENOTSUPP; |
1da177e4 LT |
1290 | goto fail; |
1291 | } | |
d9d16e8a | 1292 | fail: |
1da177e4 | 1293 | #endif |
d9d16e8a IPG |
1294 | return err; |
1295 | } | |
1296 | ||
1297 | ||
1298 | /** | |
1299 | * usb_configure_device - Detect and probe device intfs/otg (usbcore-internal) | |
1300 | * @udev: newly addressed device (in ADDRESS state) | |
1301 | * | |
1302 | * This is only called by usb_new_device() and usb_authorize_device() | |
1303 | * and FIXME -- all comments that apply to them apply here wrt to | |
1304 | * environment. | |
1305 | * | |
1306 | * If the device is WUSB and not authorized, we don't attempt to read | |
1307 | * the string descriptors, as they will be errored out by the device | |
1308 | * until it has been authorized. | |
1309 | */ | |
1310 | static int usb_configure_device(struct usb_device *udev) | |
1311 | { | |
1312 | int err; | |
1da177e4 | 1313 | |
d9d16e8a IPG |
1314 | if (udev->config == NULL) { |
1315 | err = usb_get_configuration(udev); | |
1316 | if (err < 0) { | |
1317 | dev_err(&udev->dev, "can't read configurations, error %d\n", | |
1318 | err); | |
1319 | goto fail; | |
1320 | } | |
1321 | } | |
1322 | if (udev->wusb == 1 && udev->authorized == 0) { | |
1323 | udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1324 | udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1325 | udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1326 | } | |
1327 | else { | |
1328 | /* read the standard strings and cache them if present */ | |
1329 | udev->product = usb_cache_string(udev, udev->descriptor.iProduct); | |
1330 | udev->manufacturer = usb_cache_string(udev, | |
1331 | udev->descriptor.iManufacturer); | |
1332 | udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); | |
1333 | } | |
1334 | err = usb_configure_device_otg(udev); | |
1335 | fail: | |
1336 | return err; | |
1337 | } | |
1338 | ||
1339 | ||
1340 | /** | |
1341 | * usb_new_device - perform initial device setup (usbcore-internal) | |
1342 | * @udev: newly addressed device (in ADDRESS state) | |
1343 | * | |
1344 | * This is called with devices which have been enumerated, but not yet | |
1345 | * configured. The device descriptor is available, but not descriptors | |
1346 | * for any device configuration. The caller must have locked either | |
1347 | * the parent hub (if udev is a normal device) or else the | |
1348 | * usb_bus_list_lock (if udev is a root hub). The parent's pointer to | |
1349 | * udev has already been installed, but udev is not yet visible through | |
1350 | * sysfs or other filesystem code. | |
1351 | * | |
1352 | * It will return if the device is configured properly or not. Zero if | |
1353 | * the interface was registered with the driver core; else a negative | |
1354 | * errno value. | |
1355 | * | |
1356 | * This call is synchronous, and may not be used in an interrupt context. | |
1357 | * | |
1358 | * Only the hub driver or root-hub registrar should ever call this. | |
1359 | */ | |
1360 | int usb_new_device(struct usb_device *udev) | |
1361 | { | |
1362 | int err; | |
1363 | ||
1364 | usb_detect_quirks(udev); /* Determine quirks */ | |
1365 | err = usb_configure_device(udev); /* detect & probe dev/intfs */ | |
1366 | if (err < 0) | |
1367 | goto fail; | |
9f8b17e6 KS |
1368 | /* export the usbdev device-node for libusb */ |
1369 | udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, | |
1370 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
1371 | ||
195af2cc AS |
1372 | /* Increment the parent's count of unsuspended children */ |
1373 | if (udev->parent) | |
1374 | usb_autoresume_device(udev->parent); | |
1375 | ||
782da727 | 1376 | /* Register the device. The device driver is responsible |
9f8b17e6 KS |
1377 | * for adding the device files to sysfs and for configuring |
1378 | * the device. | |
782da727 | 1379 | */ |
9f8b17e6 | 1380 | err = device_add(&udev->dev); |
1da177e4 LT |
1381 | if (err) { |
1382 | dev_err(&udev->dev, "can't device_add, error %d\n", err); | |
1383 | goto fail; | |
1384 | } | |
9ad3d6cc | 1385 | |
d9d16e8a IPG |
1386 | /* Tell the world! */ |
1387 | dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, " | |
1388 | "SerialNumber=%d\n", | |
1389 | udev->descriptor.iManufacturer, | |
1390 | udev->descriptor.iProduct, | |
1391 | udev->descriptor.iSerialNumber); | |
1392 | show_string(udev, "Product", udev->product); | |
1393 | show_string(udev, "Manufacturer", udev->manufacturer); | |
1394 | show_string(udev, "SerialNumber", udev->serial); | |
c066475e | 1395 | return err; |
1da177e4 LT |
1396 | |
1397 | fail: | |
1398 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
d9d16e8a | 1399 | return err; |
1da177e4 LT |
1400 | } |
1401 | ||
93993a0a IPG |
1402 | |
1403 | /** | |
1404 | * Similar to usb_disconnect() | |
1405 | * | |
1406 | * We share a lock (that we have) with device_del(), so we need to | |
1407 | * defer its call. | |
1408 | */ | |
1409 | int usb_deauthorize_device(struct usb_device *usb_dev) | |
1410 | { | |
1411 | unsigned cnt; | |
1412 | usb_lock_device(usb_dev); | |
1413 | if (usb_dev->authorized == 0) | |
1414 | goto out_unauthorized; | |
1415 | usb_dev->authorized = 0; | |
1416 | usb_set_configuration(usb_dev, -1); | |
1417 | usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1418 | usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1419 | usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1420 | kfree(usb_dev->config); | |
1421 | usb_dev->config = NULL; | |
1422 | for (cnt = 0; cnt < usb_dev->descriptor.bNumConfigurations; cnt++) | |
1423 | kfree(usb_dev->rawdescriptors[cnt]); | |
1424 | usb_dev->descriptor.bNumConfigurations = 0; | |
1425 | kfree(usb_dev->rawdescriptors); | |
1426 | out_unauthorized: | |
1427 | usb_unlock_device(usb_dev); | |
1428 | return 0; | |
1429 | } | |
1430 | ||
1431 | ||
1432 | int usb_authorize_device(struct usb_device *usb_dev) | |
1433 | { | |
1434 | int result = 0, c; | |
1435 | usb_lock_device(usb_dev); | |
1436 | if (usb_dev->authorized == 1) | |
1437 | goto out_authorized; | |
1438 | kfree(usb_dev->product); | |
1439 | usb_dev->product = NULL; | |
1440 | kfree(usb_dev->manufacturer); | |
1441 | usb_dev->manufacturer = NULL; | |
1442 | kfree(usb_dev->serial); | |
1443 | usb_dev->serial = NULL; | |
1444 | result = usb_autoresume_device(usb_dev); | |
1445 | if (result < 0) { | |
1446 | dev_err(&usb_dev->dev, | |
1447 | "can't autoresume for authorization: %d\n", result); | |
1448 | goto error_autoresume; | |
1449 | } | |
1450 | result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); | |
1451 | if (result < 0) { | |
1452 | dev_err(&usb_dev->dev, "can't re-read device descriptor for " | |
1453 | "authorization: %d\n", result); | |
1454 | goto error_device_descriptor; | |
1455 | } | |
1456 | usb_dev->authorized = 1; | |
1457 | result = usb_configure_device(usb_dev); | |
1458 | if (result < 0) | |
1459 | goto error_configure; | |
1460 | /* Choose and set the configuration. This registers the interfaces | |
1461 | * with the driver core and lets interface drivers bind to them. | |
1462 | */ | |
1463 | c = choose_configuration(usb_dev); | |
1464 | if (c >= 0) { | |
1465 | result = usb_set_configuration(usb_dev, c); | |
1466 | if (result) { | |
1467 | dev_err(&usb_dev->dev, | |
1468 | "can't set config #%d, error %d\n", c, result); | |
1469 | /* This need not be fatal. The user can try to | |
1470 | * set other configurations. */ | |
1471 | } | |
1472 | } | |
1473 | dev_info(&usb_dev->dev, "authorized to connect\n"); | |
1474 | error_configure: | |
1475 | error_device_descriptor: | |
1476 | error_autoresume: | |
1477 | out_authorized: | |
1478 | usb_unlock_device(usb_dev); // complements locktree | |
1479 | return result; | |
1480 | } | |
1481 | ||
1482 | ||
1da177e4 LT |
1483 | static int hub_port_status(struct usb_hub *hub, int port1, |
1484 | u16 *status, u16 *change) | |
1485 | { | |
1486 | int ret; | |
1487 | ||
db90e7a1 | 1488 | mutex_lock(&hub->status_mutex); |
1da177e4 | 1489 | ret = get_port_status(hub->hdev, port1, &hub->status->port); |
d25450c6 | 1490 | if (ret < 4) { |
1da177e4 LT |
1491 | dev_err (hub->intfdev, |
1492 | "%s failed (err = %d)\n", __FUNCTION__, ret); | |
d25450c6 AS |
1493 | if (ret >= 0) |
1494 | ret = -EIO; | |
1495 | } else { | |
1da177e4 LT |
1496 | *status = le16_to_cpu(hub->status->port.wPortStatus); |
1497 | *change = le16_to_cpu(hub->status->port.wPortChange); | |
1498 | ret = 0; | |
1499 | } | |
db90e7a1 | 1500 | mutex_unlock(&hub->status_mutex); |
1da177e4 LT |
1501 | return ret; |
1502 | } | |
1503 | ||
0165de09 IPG |
1504 | |
1505 | /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ | |
1506 | static unsigned hub_is_wusb(struct usb_hub *hub) | |
1507 | { | |
1508 | struct usb_hcd *hcd; | |
1509 | if (hub->hdev->parent != NULL) /* not a root hub? */ | |
1510 | return 0; | |
1511 | hcd = container_of(hub->hdev->bus, struct usb_hcd, self); | |
1512 | return hcd->wireless; | |
1513 | } | |
1514 | ||
1515 | ||
1da177e4 LT |
1516 | #define PORT_RESET_TRIES 5 |
1517 | #define SET_ADDRESS_TRIES 2 | |
1518 | #define GET_DESCRIPTOR_TRIES 2 | |
1519 | #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) | |
1520 | #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) | |
1521 | ||
1522 | #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ | |
1523 | #define HUB_SHORT_RESET_TIME 10 | |
1524 | #define HUB_LONG_RESET_TIME 200 | |
1525 | #define HUB_RESET_TIMEOUT 500 | |
1526 | ||
1527 | static int hub_port_wait_reset(struct usb_hub *hub, int port1, | |
1528 | struct usb_device *udev, unsigned int delay) | |
1529 | { | |
1530 | int delay_time, ret; | |
1531 | u16 portstatus; | |
1532 | u16 portchange; | |
1533 | ||
1534 | for (delay_time = 0; | |
1535 | delay_time < HUB_RESET_TIMEOUT; | |
1536 | delay_time += delay) { | |
1537 | /* wait to give the device a chance to reset */ | |
1538 | msleep(delay); | |
1539 | ||
1540 | /* read and decode port status */ | |
1541 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
1542 | if (ret < 0) | |
1543 | return ret; | |
1544 | ||
1545 | /* Device went away? */ | |
1546 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) | |
1547 | return -ENOTCONN; | |
1548 | ||
dd4dd19e | 1549 | /* bomb out completely if the connection bounced */ |
1da177e4 | 1550 | if ((portchange & USB_PORT_STAT_C_CONNECTION)) |
dd4dd19e | 1551 | return -ENOTCONN; |
1da177e4 LT |
1552 | |
1553 | /* if we`ve finished resetting, then break out of the loop */ | |
1554 | if (!(portstatus & USB_PORT_STAT_RESET) && | |
1555 | (portstatus & USB_PORT_STAT_ENABLE)) { | |
0165de09 IPG |
1556 | if (hub_is_wusb(hub)) |
1557 | udev->speed = USB_SPEED_VARIABLE; | |
1558 | else if (portstatus & USB_PORT_STAT_HIGH_SPEED) | |
1da177e4 LT |
1559 | udev->speed = USB_SPEED_HIGH; |
1560 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) | |
1561 | udev->speed = USB_SPEED_LOW; | |
1562 | else | |
1563 | udev->speed = USB_SPEED_FULL; | |
1564 | return 0; | |
1565 | } | |
1566 | ||
1567 | /* switch to the long delay after two short delay failures */ | |
1568 | if (delay_time >= 2 * HUB_SHORT_RESET_TIME) | |
1569 | delay = HUB_LONG_RESET_TIME; | |
1570 | ||
1571 | dev_dbg (hub->intfdev, | |
1572 | "port %d not reset yet, waiting %dms\n", | |
1573 | port1, delay); | |
1574 | } | |
1575 | ||
1576 | return -EBUSY; | |
1577 | } | |
1578 | ||
1579 | static int hub_port_reset(struct usb_hub *hub, int port1, | |
1580 | struct usb_device *udev, unsigned int delay) | |
1581 | { | |
1582 | int i, status; | |
1583 | ||
1584 | /* Reset the port */ | |
1585 | for (i = 0; i < PORT_RESET_TRIES; i++) { | |
1586 | status = set_port_feature(hub->hdev, | |
1587 | port1, USB_PORT_FEAT_RESET); | |
1588 | if (status) | |
1589 | dev_err(hub->intfdev, | |
1590 | "cannot reset port %d (err = %d)\n", | |
1591 | port1, status); | |
1592 | else { | |
1593 | status = hub_port_wait_reset(hub, port1, udev, delay); | |
dd16525b | 1594 | if (status && status != -ENOTCONN) |
1da177e4 LT |
1595 | dev_dbg(hub->intfdev, |
1596 | "port_wait_reset: err = %d\n", | |
1597 | status); | |
1598 | } | |
1599 | ||
1600 | /* return on disconnect or reset */ | |
1601 | switch (status) { | |
1602 | case 0: | |
b789696a DB |
1603 | /* TRSTRCY = 10 ms; plus some extra */ |
1604 | msleep(10 + 40); | |
4326ed0b | 1605 | udev->devnum = 0; /* Device now at address 0 */ |
1da177e4 LT |
1606 | /* FALL THROUGH */ |
1607 | case -ENOTCONN: | |
1608 | case -ENODEV: | |
1609 | clear_port_feature(hub->hdev, | |
1610 | port1, USB_PORT_FEAT_C_RESET); | |
1611 | /* FIXME need disconnect() for NOTATTACHED device */ | |
1612 | usb_set_device_state(udev, status | |
1613 | ? USB_STATE_NOTATTACHED | |
1614 | : USB_STATE_DEFAULT); | |
1615 | return status; | |
1616 | } | |
1617 | ||
1618 | dev_dbg (hub->intfdev, | |
1619 | "port %d not enabled, trying reset again...\n", | |
1620 | port1); | |
1621 | delay = HUB_LONG_RESET_TIME; | |
1622 | } | |
1623 | ||
1624 | dev_err (hub->intfdev, | |
1625 | "Cannot enable port %i. Maybe the USB cable is bad?\n", | |
1626 | port1); | |
1627 | ||
1628 | return status; | |
1629 | } | |
1630 | ||
d388dab7 | 1631 | #ifdef CONFIG_PM |
1da177e4 LT |
1632 | |
1633 | #ifdef CONFIG_USB_SUSPEND | |
1634 | ||
1635 | /* | |
624d6c07 AS |
1636 | * usb_port_suspend - suspend a usb device's upstream port |
1637 | * @udev: device that's no longer in active use, not a root hub | |
1638 | * Context: must be able to sleep; device not locked; pm locks held | |
1639 | * | |
1640 | * Suspends a USB device that isn't in active use, conserving power. | |
1641 | * Devices may wake out of a suspend, if anything important happens, | |
1642 | * using the remote wakeup mechanism. They may also be taken out of | |
1643 | * suspend by the host, using usb_port_resume(). It's also routine | |
1644 | * to disconnect devices while they are suspended. | |
1645 | * | |
1646 | * This only affects the USB hardware for a device; its interfaces | |
1647 | * (and, for hubs, child devices) must already have been suspended. | |
1648 | * | |
1da177e4 LT |
1649 | * Selective port suspend reduces power; most suspended devices draw |
1650 | * less than 500 uA. It's also used in OTG, along with remote wakeup. | |
1651 | * All devices below the suspended port are also suspended. | |
1652 | * | |
1653 | * Devices leave suspend state when the host wakes them up. Some devices | |
1654 | * also support "remote wakeup", where the device can activate the USB | |
1655 | * tree above them to deliver data, such as a keypress or packet. In | |
1656 | * some cases, this wakes the USB host. | |
624d6c07 AS |
1657 | * |
1658 | * Suspending OTG devices may trigger HNP, if that's been enabled | |
1659 | * between a pair of dual-role devices. That will change roles, such | |
1660 | * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. | |
1661 | * | |
1662 | * Devices on USB hub ports have only one "suspend" state, corresponding | |
1663 | * to ACPI D2, "may cause the device to lose some context". | |
1664 | * State transitions include: | |
1665 | * | |
1666 | * - suspend, resume ... when the VBUS power link stays live | |
1667 | * - suspend, disconnect ... VBUS lost | |
1668 | * | |
1669 | * Once VBUS drop breaks the circuit, the port it's using has to go through | |
1670 | * normal re-enumeration procedures, starting with enabling VBUS power. | |
1671 | * Other than re-initializing the hub (plug/unplug, except for root hubs), | |
1672 | * Linux (2.6) currently has NO mechanisms to initiate that: no khubd | |
1673 | * timer, no SRP, no requests through sysfs. | |
1674 | * | |
1675 | * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when | |
1676 | * the root hub for their bus goes into global suspend ... so we don't | |
1677 | * (falsely) update the device power state to say it suspended. | |
1678 | * | |
1679 | * Returns 0 on success, else negative errno. | |
1da177e4 | 1680 | */ |
624d6c07 | 1681 | int usb_port_suspend(struct usb_device *udev) |
1da177e4 | 1682 | { |
624d6c07 AS |
1683 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
1684 | int port1 = udev->portnum; | |
1685 | int status; | |
1da177e4 LT |
1686 | |
1687 | // dev_dbg(hub->intfdev, "suspend port %d\n", port1); | |
1688 | ||
1689 | /* enable remote wakeup when appropriate; this lets the device | |
1690 | * wake up the upstream hub (including maybe the root hub). | |
1691 | * | |
1692 | * NOTE: OTG devices may issue remote wakeup (or SRP) even when | |
1693 | * we don't explicitly enable it here. | |
1694 | */ | |
645daaab | 1695 | if (udev->do_remote_wakeup) { |
1da177e4 LT |
1696 | status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
1697 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
1698 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
1699 | NULL, 0, | |
1700 | USB_CTRL_SET_TIMEOUT); | |
1701 | if (status) | |
624d6c07 AS |
1702 | dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", |
1703 | status); | |
1da177e4 LT |
1704 | } |
1705 | ||
1706 | /* see 7.1.7.6 */ | |
1707 | status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); | |
1708 | if (status) { | |
624d6c07 AS |
1709 | dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", |
1710 | port1, status); | |
1da177e4 LT |
1711 | /* paranoia: "should not happen" */ |
1712 | (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
1713 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, | |
1714 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
1715 | NULL, 0, | |
1716 | USB_CTRL_SET_TIMEOUT); | |
1717 | } else { | |
1718 | /* device has up to 10 msec to fully suspend */ | |
645daaab AS |
1719 | dev_dbg(&udev->dev, "usb %ssuspend\n", |
1720 | udev->auto_pm ? "auto-" : ""); | |
1da177e4 LT |
1721 | usb_set_device_state(udev, USB_STATE_SUSPENDED); |
1722 | msleep(10); | |
1723 | } | |
1724 | return status; | |
1725 | } | |
1726 | ||
1da177e4 | 1727 | /* |
390a8c34 DB |
1728 | * If the USB "suspend" state is in use (rather than "global suspend"), |
1729 | * many devices will be individually taken out of suspend state using | |
54515fe5 | 1730 | * special "resume" signaling. This routine kicks in shortly after |
1da177e4 LT |
1731 | * hardware resume signaling is finished, either because of selective |
1732 | * resume (by host) or remote wakeup (by device) ... now see what changed | |
1733 | * in the tree that's rooted at this device. | |
54515fe5 AS |
1734 | * |
1735 | * If @udev->reset_resume is set then the device is reset before the | |
1736 | * status check is done. | |
1da177e4 | 1737 | */ |
140d8f68 | 1738 | static int finish_port_resume(struct usb_device *udev) |
1da177e4 | 1739 | { |
54515fe5 | 1740 | int status = 0; |
1da177e4 LT |
1741 | u16 devstatus; |
1742 | ||
1743 | /* caller owns the udev device lock */ | |
54515fe5 AS |
1744 | dev_dbg(&udev->dev, "finish %sresume\n", |
1745 | udev->reset_resume ? "reset-" : ""); | |
1da177e4 LT |
1746 | |
1747 | /* usb ch9 identifies four variants of SUSPENDED, based on what | |
1748 | * state the device resumes to. Linux currently won't see the | |
1749 | * first two on the host side; they'd be inside hub_port_init() | |
1750 | * during many timeouts, but khubd can't suspend until later. | |
1751 | */ | |
1752 | usb_set_device_state(udev, udev->actconfig | |
1753 | ? USB_STATE_CONFIGURED | |
1754 | : USB_STATE_ADDRESS); | |
1da177e4 | 1755 | |
54515fe5 AS |
1756 | /* 10.5.4.5 says not to reset a suspended port if the attached |
1757 | * device is enabled for remote wakeup. Hence the reset | |
1758 | * operation is carried out here, after the port has been | |
1759 | * resumed. | |
1760 | */ | |
1761 | if (udev->reset_resume) | |
1762 | status = usb_reset_device(udev); | |
1763 | ||
1da177e4 LT |
1764 | /* 10.5.4.5 says be sure devices in the tree are still there. |
1765 | * For now let's assume the device didn't go crazy on resume, | |
1766 | * and device drivers will know about any resume quirks. | |
1767 | */ | |
54515fe5 | 1768 | if (status == 0) { |
46dede46 | 1769 | devstatus = 0; |
54515fe5 AS |
1770 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); |
1771 | if (status >= 0) | |
46dede46 | 1772 | status = (status > 0 ? 0 : -ENODEV); |
54515fe5 | 1773 | } |
b40b7a90 | 1774 | |
624d6c07 AS |
1775 | if (status) { |
1776 | dev_dbg(&udev->dev, "gone after usb resume? status %d\n", | |
1777 | status); | |
1778 | } else if (udev->actconfig) { | |
1da177e4 | 1779 | le16_to_cpus(&devstatus); |
686314cf | 1780 | if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) { |
1da177e4 LT |
1781 | status = usb_control_msg(udev, |
1782 | usb_sndctrlpipe(udev, 0), | |
1783 | USB_REQ_CLEAR_FEATURE, | |
1784 | USB_RECIP_DEVICE, | |
1785 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
1786 | NULL, 0, | |
1787 | USB_CTRL_SET_TIMEOUT); | |
a8e7c565 | 1788 | if (status) |
1da177e4 LT |
1789 | dev_dbg(&udev->dev, "disable remote " |
1790 | "wakeup, status %d\n", status); | |
4bf0ba86 | 1791 | } |
1da177e4 | 1792 | status = 0; |
1da177e4 LT |
1793 | } |
1794 | return status; | |
1795 | } | |
1796 | ||
624d6c07 AS |
1797 | /* |
1798 | * usb_port_resume - re-activate a suspended usb device's upstream port | |
1799 | * @udev: device to re-activate, not a root hub | |
1800 | * Context: must be able to sleep; device not locked; pm locks held | |
1801 | * | |
1802 | * This will re-activate the suspended device, increasing power usage | |
1803 | * while letting drivers communicate again with its endpoints. | |
1804 | * USB resume explicitly guarantees that the power session between | |
1805 | * the host and the device is the same as it was when the device | |
1806 | * suspended. | |
1807 | * | |
54515fe5 AS |
1808 | * If CONFIG_USB_PERSIST and @udev->reset_resume are both set then this |
1809 | * routine won't check that the port is still enabled. Furthermore, | |
1810 | * if @udev->reset_resume is set then finish_port_resume() above will | |
1811 | * reset @udev. The end result is that a broken power session can be | |
1812 | * recovered and @udev will appear to persist across a loss of VBUS power. | |
1813 | * | |
1814 | * For example, if a host controller doesn't maintain VBUS suspend current | |
1815 | * during a system sleep or is reset when the system wakes up, all the USB | |
1816 | * power sessions below it will be broken. This is especially troublesome | |
1817 | * for mass-storage devices containing mounted filesystems, since the | |
1818 | * device will appear to have disconnected and all the memory mappings | |
1819 | * to it will be lost. Using the USB_PERSIST facility, the device can be | |
1820 | * made to appear as if it had not disconnected. | |
1821 | * | |
1822 | * This facility is inherently dangerous. Although usb_reset_device() | |
1823 | * makes every effort to insure that the same device is present after the | |
1824 | * reset as before, it cannot provide a 100% guarantee. Furthermore it's | |
1825 | * quite possible for a device to remain unaltered but its media to be | |
1826 | * changed. If the user replaces a flash memory card while the system is | |
1827 | * asleep, he will have only himself to blame when the filesystem on the | |
1828 | * new card is corrupted and the system crashes. | |
1829 | * | |
624d6c07 AS |
1830 | * Returns 0 on success, else negative errno. |
1831 | */ | |
1832 | int usb_port_resume(struct usb_device *udev) | |
1da177e4 | 1833 | { |
624d6c07 AS |
1834 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
1835 | int port1 = udev->portnum; | |
1836 | int status; | |
1837 | u16 portchange, portstatus; | |
54515fe5 | 1838 | unsigned mask_flags, want_flags; |
d25450c6 AS |
1839 | |
1840 | /* Skip the initial Clear-Suspend step for a remote wakeup */ | |
1841 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
1842 | if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND)) | |
1843 | goto SuspendCleared; | |
1da177e4 LT |
1844 | |
1845 | // dev_dbg(hub->intfdev, "resume port %d\n", port1); | |
1846 | ||
d5cbad4b AS |
1847 | set_bit(port1, hub->busy_bits); |
1848 | ||
1da177e4 LT |
1849 | /* see 7.1.7.7; affects power usage, but not budgeting */ |
1850 | status = clear_port_feature(hub->hdev, | |
1851 | port1, USB_PORT_FEAT_SUSPEND); | |
1852 | if (status) { | |
624d6c07 AS |
1853 | dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", |
1854 | port1, status); | |
1da177e4 | 1855 | } else { |
1da177e4 | 1856 | /* drive resume for at least 20 msec */ |
686314cf AS |
1857 | dev_dbg(&udev->dev, "usb %sresume\n", |
1858 | udev->auto_pm ? "auto-" : ""); | |
1da177e4 LT |
1859 | msleep(25); |
1860 | ||
1da177e4 LT |
1861 | /* Virtual root hubs can trigger on GET_PORT_STATUS to |
1862 | * stop resume signaling. Then finish the resume | |
1863 | * sequence. | |
1864 | */ | |
d25450c6 | 1865 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
54515fe5 AS |
1866 | |
1867 | SuspendCleared: | |
1868 | if (USB_PERSIST && udev->reset_resume) | |
1869 | want_flags = USB_PORT_STAT_POWER | |
1870 | | USB_PORT_STAT_CONNECTION; | |
1871 | else | |
1872 | want_flags = USB_PORT_STAT_POWER | |
1873 | | USB_PORT_STAT_CONNECTION | |
1874 | | USB_PORT_STAT_ENABLE; | |
1875 | mask_flags = want_flags | USB_PORT_STAT_SUSPEND; | |
1876 | ||
1877 | if (status < 0 || (portstatus & mask_flags) != want_flags) { | |
1da177e4 LT |
1878 | dev_dbg(hub->intfdev, |
1879 | "port %d status %04x.%04x after resume, %d\n", | |
d25450c6 | 1880 | port1, portchange, portstatus, status); |
20307949 AS |
1881 | if (status >= 0) |
1882 | status = -ENODEV; | |
1da177e4 | 1883 | } else { |
20307949 AS |
1884 | if (portchange & USB_PORT_STAT_C_SUSPEND) |
1885 | clear_port_feature(hub->hdev, port1, | |
1886 | USB_PORT_FEAT_C_SUSPEND); | |
1da177e4 LT |
1887 | /* TRSMRCY = 10 msec */ |
1888 | msleep(10); | |
1da177e4 LT |
1889 | } |
1890 | } | |
1da177e4 | 1891 | |
d5cbad4b AS |
1892 | clear_bit(port1, hub->busy_bits); |
1893 | if (!hub->hdev->parent && !hub->busy_bits[0]) | |
1894 | usb_enable_root_hub_irq(hub->hdev->bus); | |
1895 | ||
54515fe5 AS |
1896 | if (status == 0) |
1897 | status = finish_port_resume(udev); | |
1898 | if (status < 0) { | |
1899 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); | |
1900 | hub_port_logical_disconnect(hub, port1); | |
1901 | } | |
1da177e4 LT |
1902 | return status; |
1903 | } | |
1904 | ||
1da177e4 LT |
1905 | static int remote_wakeup(struct usb_device *udev) |
1906 | { | |
1907 | int status = 0; | |
1908 | ||
9ad3d6cc | 1909 | usb_lock_device(udev); |
1da177e4 | 1910 | if (udev->state == USB_STATE_SUSPENDED) { |
645daaab | 1911 | dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); |
1941044a | 1912 | usb_mark_last_busy(udev); |
6b157c9b | 1913 | status = usb_external_resume_device(udev); |
1da177e4 | 1914 | } |
9ad3d6cc | 1915 | usb_unlock_device(udev); |
1da177e4 LT |
1916 | return status; |
1917 | } | |
1918 | ||
d388dab7 AS |
1919 | #else /* CONFIG_USB_SUSPEND */ |
1920 | ||
1921 | /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ | |
1922 | ||
1923 | int usb_port_suspend(struct usb_device *udev) | |
1924 | { | |
1925 | return 0; | |
1926 | } | |
1927 | ||
d388dab7 AS |
1928 | int usb_port_resume(struct usb_device *udev) |
1929 | { | |
54515fe5 AS |
1930 | int status = 0; |
1931 | ||
1932 | /* However we may need to do a reset-resume */ | |
1933 | if (udev->reset_resume) { | |
1934 | dev_dbg(&udev->dev, "reset-resume\n"); | |
1935 | status = usb_reset_device(udev); | |
1936 | } | |
1937 | return status; | |
d388dab7 AS |
1938 | } |
1939 | ||
1940 | static inline int remote_wakeup(struct usb_device *udev) | |
1941 | { | |
1942 | return 0; | |
1943 | } | |
1944 | ||
1945 | #endif | |
1946 | ||
db690874 | 1947 | static int hub_suspend(struct usb_interface *intf, pm_message_t msg) |
1da177e4 LT |
1948 | { |
1949 | struct usb_hub *hub = usb_get_intfdata (intf); | |
1950 | struct usb_device *hdev = hub->hdev; | |
1951 | unsigned port1; | |
1da177e4 | 1952 | |
c9f89fa4 | 1953 | /* fail if children aren't already suspended */ |
1da177e4 LT |
1954 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
1955 | struct usb_device *udev; | |
1956 | ||
1957 | udev = hdev->children [port1-1]; | |
114b368c | 1958 | if (udev && msg.event == PM_EVENT_SUSPEND && |
f3f3253d | 1959 | #ifdef CONFIG_USB_SUSPEND |
114b368c AS |
1960 | udev->state != USB_STATE_SUSPENDED |
1961 | #else | |
1962 | udev->dev.power.power_state.event | |
1963 | == PM_EVENT_ON | |
f3f3253d | 1964 | #endif |
114b368c | 1965 | ) { |
645daaab AS |
1966 | if (!hdev->auto_pm) |
1967 | dev_dbg(&intf->dev, "port %d nyet suspended\n", | |
1968 | port1); | |
c9f89fa4 DB |
1969 | return -EBUSY; |
1970 | } | |
1da177e4 LT |
1971 | } |
1972 | ||
40f122f3 AS |
1973 | dev_dbg(&intf->dev, "%s\n", __FUNCTION__); |
1974 | ||
12f1ff83 AS |
1975 | /* stop khubd and related activity */ |
1976 | hub_quiesce(hub); | |
b6f6436d | 1977 | return 0; |
1da177e4 LT |
1978 | } |
1979 | ||
1980 | static int hub_resume(struct usb_interface *intf) | |
1981 | { | |
1da177e4 | 1982 | struct usb_hub *hub = usb_get_intfdata (intf); |
1da177e4 | 1983 | |
40f122f3 AS |
1984 | dev_dbg(&intf->dev, "%s\n", __FUNCTION__); |
1985 | ||
a8e7c565 | 1986 | /* tell khubd to look for changes on this hub */ |
f3f3253d | 1987 | hub_activate(hub); |
1da177e4 LT |
1988 | return 0; |
1989 | } | |
1990 | ||
b41a60ec | 1991 | static int hub_reset_resume(struct usb_interface *intf) |
f07600cf | 1992 | { |
b41a60ec | 1993 | struct usb_hub *hub = usb_get_intfdata(intf); |
f07600cf AS |
1994 | struct usb_device *hdev = hub->hdev; |
1995 | int port1; | |
1996 | ||
b41a60ec AS |
1997 | hub_power_on(hub); |
1998 | ||
f07600cf AS |
1999 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { |
2000 | struct usb_device *child = hdev->children[port1-1]; | |
2001 | ||
2002 | if (child) { | |
b41a60ec AS |
2003 | |
2004 | /* For "USB_PERSIST"-enabled children we must | |
2005 | * mark the child device for reset-resume and | |
2006 | * turn off the connect-change status to prevent | |
2007 | * khubd from disconnecting it later. | |
2008 | */ | |
2009 | if (USB_PERSIST && child->persist_enabled) { | |
2010 | child->reset_resume = 1; | |
2011 | clear_port_feature(hdev, port1, | |
2012 | USB_PORT_FEAT_C_CONNECTION); | |
2013 | ||
2014 | /* Otherwise we must disconnect the child, | |
2015 | * but as we may not lock the child device here | |
2016 | * we have to do a "logical" disconnect. | |
2017 | */ | |
2018 | } else { | |
2019 | hub_port_logical_disconnect(hub, port1); | |
2020 | } | |
f07600cf AS |
2021 | } |
2022 | } | |
f07600cf | 2023 | |
f07600cf AS |
2024 | hub_activate(hub); |
2025 | return 0; | |
2026 | } | |
2027 | ||
54515fe5 AS |
2028 | /** |
2029 | * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power | |
2030 | * @rhdev: struct usb_device for the root hub | |
2031 | * | |
2032 | * The USB host controller driver calls this function when its root hub | |
2033 | * is resumed and Vbus power has been interrupted or the controller | |
2034 | * has been reset. The routine marks @rhdev as having lost power. When | |
2035 | * the hub driver is resumed it will take notice; if CONFIG_USB_PERSIST | |
2036 | * is enabled then it will carry out power-session recovery, otherwise | |
2037 | * it will disconnect all the child devices. | |
2038 | */ | |
2039 | void usb_root_hub_lost_power(struct usb_device *rhdev) | |
2040 | { | |
2041 | dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); | |
2042 | rhdev->reset_resume = 1; | |
2043 | } | |
2044 | EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); | |
2045 | ||
d388dab7 AS |
2046 | #else /* CONFIG_PM */ |
2047 | ||
2048 | static inline int remote_wakeup(struct usb_device *udev) | |
2049 | { | |
2050 | return 0; | |
2051 | } | |
2052 | ||
f07600cf AS |
2053 | #define hub_suspend NULL |
2054 | #define hub_resume NULL | |
2055 | #define hub_reset_resume NULL | |
d388dab7 AS |
2056 | #endif |
2057 | ||
1da177e4 LT |
2058 | |
2059 | /* USB 2.0 spec, 7.1.7.3 / fig 7-29: | |
2060 | * | |
2061 | * Between connect detection and reset signaling there must be a delay | |
2062 | * of 100ms at least for debounce and power-settling. The corresponding | |
2063 | * timer shall restart whenever the downstream port detects a disconnect. | |
2064 | * | |
2065 | * Apparently there are some bluetooth and irda-dongles and a number of | |
2066 | * low-speed devices for which this debounce period may last over a second. | |
2067 | * Not covered by the spec - but easy to deal with. | |
2068 | * | |
2069 | * This implementation uses a 1500ms total debounce timeout; if the | |
2070 | * connection isn't stable by then it returns -ETIMEDOUT. It checks | |
2071 | * every 25ms for transient disconnects. When the port status has been | |
2072 | * unchanged for 100ms it returns the port status. | |
2073 | */ | |
2074 | ||
2075 | #define HUB_DEBOUNCE_TIMEOUT 1500 | |
2076 | #define HUB_DEBOUNCE_STEP 25 | |
2077 | #define HUB_DEBOUNCE_STABLE 100 | |
2078 | ||
2079 | static int hub_port_debounce(struct usb_hub *hub, int port1) | |
2080 | { | |
2081 | int ret; | |
2082 | int total_time, stable_time = 0; | |
2083 | u16 portchange, portstatus; | |
2084 | unsigned connection = 0xffff; | |
2085 | ||
2086 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { | |
2087 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
2088 | if (ret < 0) | |
2089 | return ret; | |
2090 | ||
2091 | if (!(portchange & USB_PORT_STAT_C_CONNECTION) && | |
2092 | (portstatus & USB_PORT_STAT_CONNECTION) == connection) { | |
2093 | stable_time += HUB_DEBOUNCE_STEP; | |
2094 | if (stable_time >= HUB_DEBOUNCE_STABLE) | |
2095 | break; | |
2096 | } else { | |
2097 | stable_time = 0; | |
2098 | connection = portstatus & USB_PORT_STAT_CONNECTION; | |
2099 | } | |
2100 | ||
2101 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
2102 | clear_port_feature(hub->hdev, port1, | |
2103 | USB_PORT_FEAT_C_CONNECTION); | |
2104 | } | |
2105 | ||
2106 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
2107 | break; | |
2108 | msleep(HUB_DEBOUNCE_STEP); | |
2109 | } | |
2110 | ||
2111 | dev_dbg (hub->intfdev, | |
2112 | "debounce: port %d: total %dms stable %dms status 0x%x\n", | |
2113 | port1, total_time, stable_time, portstatus); | |
2114 | ||
2115 | if (stable_time < HUB_DEBOUNCE_STABLE) | |
2116 | return -ETIMEDOUT; | |
2117 | return portstatus; | |
2118 | } | |
2119 | ||
2120 | static void ep0_reinit(struct usb_device *udev) | |
2121 | { | |
2122 | usb_disable_endpoint(udev, 0 + USB_DIR_IN); | |
2123 | usb_disable_endpoint(udev, 0 + USB_DIR_OUT); | |
bdd016ba | 2124 | usb_enable_endpoint(udev, &udev->ep0); |
1da177e4 LT |
2125 | } |
2126 | ||
2127 | #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) | |
2128 | #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) | |
2129 | ||
4326ed0b | 2130 | static int hub_set_address(struct usb_device *udev, int devnum) |
1da177e4 LT |
2131 | { |
2132 | int retval; | |
2133 | ||
4326ed0b | 2134 | if (devnum <= 1) |
1da177e4 LT |
2135 | return -EINVAL; |
2136 | if (udev->state == USB_STATE_ADDRESS) | |
2137 | return 0; | |
2138 | if (udev->state != USB_STATE_DEFAULT) | |
2139 | return -EINVAL; | |
2140 | retval = usb_control_msg(udev, usb_sndaddr0pipe(), | |
4326ed0b | 2141 | USB_REQ_SET_ADDRESS, 0, devnum, 0, |
1da177e4 LT |
2142 | NULL, 0, USB_CTRL_SET_TIMEOUT); |
2143 | if (retval == 0) { | |
4326ed0b | 2144 | udev->devnum = devnum; /* Device now using proper address */ |
1da177e4 LT |
2145 | usb_set_device_state(udev, USB_STATE_ADDRESS); |
2146 | ep0_reinit(udev); | |
2147 | } | |
2148 | return retval; | |
2149 | } | |
2150 | ||
2151 | /* Reset device, (re)assign address, get device descriptor. | |
2152 | * Device connection must be stable, no more debouncing needed. | |
2153 | * Returns device in USB_STATE_ADDRESS, except on error. | |
2154 | * | |
2155 | * If this is called for an already-existing device (as part of | |
2156 | * usb_reset_device), the caller must own the device lock. For a | |
2157 | * newly detected device that is not accessible through any global | |
2158 | * pointers, it's not necessary to lock the device. | |
2159 | */ | |
2160 | static int | |
2161 | hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, | |
2162 | int retry_counter) | |
2163 | { | |
4186ecf8 | 2164 | static DEFINE_MUTEX(usb_address0_mutex); |
1da177e4 LT |
2165 | |
2166 | struct usb_device *hdev = hub->hdev; | |
2167 | int i, j, retval; | |
2168 | unsigned delay = HUB_SHORT_RESET_TIME; | |
2169 | enum usb_device_speed oldspeed = udev->speed; | |
83a07196 | 2170 | char *speed, *type; |
4326ed0b | 2171 | int devnum = udev->devnum; |
1da177e4 LT |
2172 | |
2173 | /* root hub ports have a slightly longer reset period | |
2174 | * (from USB 2.0 spec, section 7.1.7.5) | |
2175 | */ | |
2176 | if (!hdev->parent) { | |
2177 | delay = HUB_ROOT_RESET_TIME; | |
2178 | if (port1 == hdev->bus->otg_port) | |
2179 | hdev->bus->b_hnp_enable = 0; | |
2180 | } | |
2181 | ||
2182 | /* Some low speed devices have problems with the quick delay, so */ | |
2183 | /* be a bit pessimistic with those devices. RHbug #23670 */ | |
2184 | if (oldspeed == USB_SPEED_LOW) | |
2185 | delay = HUB_LONG_RESET_TIME; | |
2186 | ||
4186ecf8 | 2187 | mutex_lock(&usb_address0_mutex); |
1da177e4 LT |
2188 | |
2189 | /* Reset the device; full speed may morph to high speed */ | |
2190 | retval = hub_port_reset(hub, port1, udev, delay); | |
2191 | if (retval < 0) /* error or disconnect */ | |
2192 | goto fail; | |
2193 | /* success, speed is known */ | |
2194 | retval = -ENODEV; | |
2195 | ||
2196 | if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { | |
2197 | dev_dbg(&udev->dev, "device reset changed speed!\n"); | |
2198 | goto fail; | |
2199 | } | |
2200 | oldspeed = udev->speed; | |
4326ed0b | 2201 | |
1da177e4 LT |
2202 | /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... |
2203 | * it's fixed size except for full speed devices. | |
5bb6e0ae IPG |
2204 | * For Wireless USB devices, ep0 max packet is always 512 (tho |
2205 | * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. | |
1da177e4 LT |
2206 | */ |
2207 | switch (udev->speed) { | |
5bb6e0ae IPG |
2208 | case USB_SPEED_VARIABLE: /* fixed at 512 */ |
2209 | udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512); | |
2210 | break; | |
1da177e4 LT |
2211 | case USB_SPEED_HIGH: /* fixed at 64 */ |
2212 | udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); | |
2213 | break; | |
2214 | case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ | |
2215 | /* to determine the ep0 maxpacket size, try to read | |
2216 | * the device descriptor to get bMaxPacketSize0 and | |
2217 | * then correct our initial guess. | |
2218 | */ | |
2219 | udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); | |
2220 | break; | |
2221 | case USB_SPEED_LOW: /* fixed at 8 */ | |
2222 | udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8); | |
2223 | break; | |
2224 | default: | |
2225 | goto fail; | |
2226 | } | |
2227 | ||
83a07196 IPG |
2228 | type = ""; |
2229 | switch (udev->speed) { | |
2230 | case USB_SPEED_LOW: speed = "low"; break; | |
2231 | case USB_SPEED_FULL: speed = "full"; break; | |
2232 | case USB_SPEED_HIGH: speed = "high"; break; | |
2233 | case USB_SPEED_VARIABLE: | |
2234 | speed = "variable"; | |
2235 | type = "Wireless "; | |
2236 | break; | |
2237 | default: speed = "?"; break; | |
2238 | } | |
1da177e4 | 2239 | dev_info (&udev->dev, |
83a07196 IPG |
2240 | "%s %s speed %sUSB device using %s and address %d\n", |
2241 | (udev->config) ? "reset" : "new", speed, type, | |
4326ed0b | 2242 | udev->bus->controller->driver->name, devnum); |
1da177e4 LT |
2243 | |
2244 | /* Set up TT records, if needed */ | |
2245 | if (hdev->tt) { | |
2246 | udev->tt = hdev->tt; | |
2247 | udev->ttport = hdev->ttport; | |
2248 | } else if (udev->speed != USB_SPEED_HIGH | |
2249 | && hdev->speed == USB_SPEED_HIGH) { | |
2250 | udev->tt = &hub->tt; | |
2251 | udev->ttport = port1; | |
2252 | } | |
2253 | ||
2254 | /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? | |
2255 | * Because device hardware and firmware is sometimes buggy in | |
2256 | * this area, and this is how Linux has done it for ages. | |
2257 | * Change it cautiously. | |
2258 | * | |
2259 | * NOTE: If USE_NEW_SCHEME() is true we will start by issuing | |
2260 | * a 64-byte GET_DESCRIPTOR request. This is what Windows does, | |
2261 | * so it may help with some non-standards-compliant devices. | |
2262 | * Otherwise we start with SET_ADDRESS and then try to read the | |
2263 | * first 8 bytes of the device descriptor to get the ep0 maxpacket | |
2264 | * value. | |
2265 | */ | |
2266 | for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { | |
2267 | if (USE_NEW_SCHEME(retry_counter)) { | |
2268 | struct usb_device_descriptor *buf; | |
2269 | int r = 0; | |
2270 | ||
2271 | #define GET_DESCRIPTOR_BUFSIZE 64 | |
2272 | buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); | |
2273 | if (!buf) { | |
2274 | retval = -ENOMEM; | |
2275 | continue; | |
2276 | } | |
2277 | ||
b89ee19a AS |
2278 | /* Retry on all errors; some devices are flakey. |
2279 | * 255 is for WUSB devices, we actually need to use | |
2280 | * 512 (WUSB1.0[4.8.1]). | |
1da177e4 LT |
2281 | */ |
2282 | for (j = 0; j < 3; ++j) { | |
2283 | buf->bMaxPacketSize0 = 0; | |
2284 | r = usb_control_msg(udev, usb_rcvaddr0pipe(), | |
2285 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, | |
2286 | USB_DT_DEVICE << 8, 0, | |
2287 | buf, GET_DESCRIPTOR_BUFSIZE, | |
b89ee19a | 2288 | USB_CTRL_GET_TIMEOUT); |
1da177e4 | 2289 | switch (buf->bMaxPacketSize0) { |
5bb6e0ae | 2290 | case 8: case 16: case 32: case 64: case 255: |
1da177e4 LT |
2291 | if (buf->bDescriptorType == |
2292 | USB_DT_DEVICE) { | |
2293 | r = 0; | |
2294 | break; | |
2295 | } | |
2296 | /* FALL THROUGH */ | |
2297 | default: | |
2298 | if (r == 0) | |
2299 | r = -EPROTO; | |
2300 | break; | |
2301 | } | |
2302 | if (r == 0) | |
2303 | break; | |
2304 | } | |
2305 | udev->descriptor.bMaxPacketSize0 = | |
2306 | buf->bMaxPacketSize0; | |
2307 | kfree(buf); | |
2308 | ||
2309 | retval = hub_port_reset(hub, port1, udev, delay); | |
2310 | if (retval < 0) /* error or disconnect */ | |
2311 | goto fail; | |
2312 | if (oldspeed != udev->speed) { | |
2313 | dev_dbg(&udev->dev, | |
2314 | "device reset changed speed!\n"); | |
2315 | retval = -ENODEV; | |
2316 | goto fail; | |
2317 | } | |
2318 | if (r) { | |
2319 | dev_err(&udev->dev, "device descriptor " | |
2320 | "read/%s, error %d\n", | |
2321 | "64", r); | |
2322 | retval = -EMSGSIZE; | |
2323 | continue; | |
2324 | } | |
2325 | #undef GET_DESCRIPTOR_BUFSIZE | |
2326 | } | |
2327 | ||
2328 | for (j = 0; j < SET_ADDRESS_TRIES; ++j) { | |
4326ed0b | 2329 | retval = hub_set_address(udev, devnum); |
1da177e4 LT |
2330 | if (retval >= 0) |
2331 | break; | |
2332 | msleep(200); | |
2333 | } | |
2334 | if (retval < 0) { | |
2335 | dev_err(&udev->dev, | |
2336 | "device not accepting address %d, error %d\n", | |
4326ed0b | 2337 | devnum, retval); |
1da177e4 LT |
2338 | goto fail; |
2339 | } | |
2340 | ||
2341 | /* cope with hardware quirkiness: | |
2342 | * - let SET_ADDRESS settle, some device hardware wants it | |
2343 | * - read ep0 maxpacket even for high and low speed, | |
2344 | */ | |
2345 | msleep(10); | |
2346 | if (USE_NEW_SCHEME(retry_counter)) | |
2347 | break; | |
2348 | ||
2349 | retval = usb_get_device_descriptor(udev, 8); | |
2350 | if (retval < 8) { | |
2351 | dev_err(&udev->dev, "device descriptor " | |
2352 | "read/%s, error %d\n", | |
2353 | "8", retval); | |
2354 | if (retval >= 0) | |
2355 | retval = -EMSGSIZE; | |
2356 | } else { | |
2357 | retval = 0; | |
2358 | break; | |
2359 | } | |
2360 | } | |
2361 | if (retval) | |
2362 | goto fail; | |
2363 | ||
5bb6e0ae IPG |
2364 | i = udev->descriptor.bMaxPacketSize0 == 0xff? |
2365 | 512 : udev->descriptor.bMaxPacketSize0; | |
1da177e4 LT |
2366 | if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { |
2367 | if (udev->speed != USB_SPEED_FULL || | |
2368 | !(i == 8 || i == 16 || i == 32 || i == 64)) { | |
2369 | dev_err(&udev->dev, "ep0 maxpacket = %d\n", i); | |
2370 | retval = -EMSGSIZE; | |
2371 | goto fail; | |
2372 | } | |
2373 | dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); | |
2374 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); | |
2375 | ep0_reinit(udev); | |
2376 | } | |
2377 | ||
2378 | retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); | |
2379 | if (retval < (signed)sizeof(udev->descriptor)) { | |
2380 | dev_err(&udev->dev, "device descriptor read/%s, error %d\n", | |
2381 | "all", retval); | |
2382 | if (retval >= 0) | |
2383 | retval = -ENOMSG; | |
2384 | goto fail; | |
2385 | } | |
2386 | ||
2387 | retval = 0; | |
2388 | ||
2389 | fail: | |
4326ed0b | 2390 | if (retval) { |
1da177e4 | 2391 | hub_port_disable(hub, port1, 0); |
4326ed0b AS |
2392 | udev->devnum = devnum; /* for disconnect processing */ |
2393 | } | |
4186ecf8 | 2394 | mutex_unlock(&usb_address0_mutex); |
1da177e4 LT |
2395 | return retval; |
2396 | } | |
2397 | ||
2398 | static void | |
2399 | check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) | |
2400 | { | |
2401 | struct usb_qualifier_descriptor *qual; | |
2402 | int status; | |
2403 | ||
e94b1766 | 2404 | qual = kmalloc (sizeof *qual, GFP_KERNEL); |
1da177e4 LT |
2405 | if (qual == NULL) |
2406 | return; | |
2407 | ||
2408 | status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, | |
2409 | qual, sizeof *qual); | |
2410 | if (status == sizeof *qual) { | |
2411 | dev_info(&udev->dev, "not running at top speed; " | |
2412 | "connect to a high speed hub\n"); | |
2413 | /* hub LEDs are probably harder to miss than syslog */ | |
2414 | if (hub->has_indicators) { | |
2415 | hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; | |
c4028958 | 2416 | schedule_delayed_work (&hub->leds, 0); |
1da177e4 LT |
2417 | } |
2418 | } | |
1bc3c9e1 | 2419 | kfree(qual); |
1da177e4 LT |
2420 | } |
2421 | ||
2422 | static unsigned | |
2423 | hub_power_remaining (struct usb_hub *hub) | |
2424 | { | |
2425 | struct usb_device *hdev = hub->hdev; | |
2426 | int remaining; | |
55c52718 | 2427 | int port1; |
1da177e4 | 2428 | |
55c52718 | 2429 | if (!hub->limited_power) |
1da177e4 LT |
2430 | return 0; |
2431 | ||
55c52718 AS |
2432 | remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; |
2433 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
2434 | struct usb_device *udev = hdev->children[port1 - 1]; | |
2435 | int delta; | |
1da177e4 LT |
2436 | |
2437 | if (!udev) | |
2438 | continue; | |
2439 | ||
55c52718 AS |
2440 | /* Unconfigured devices may not use more than 100mA, |
2441 | * or 8mA for OTG ports */ | |
1da177e4 | 2442 | if (udev->actconfig) |
55c52718 AS |
2443 | delta = udev->actconfig->desc.bMaxPower * 2; |
2444 | else if (port1 != udev->bus->otg_port || hdev->parent) | |
2445 | delta = 100; | |
1da177e4 | 2446 | else |
55c52718 AS |
2447 | delta = 8; |
2448 | if (delta > hub->mA_per_port) | |
2449 | dev_warn(&udev->dev, "%dmA is over %umA budget " | |
2450 | "for port %d!\n", | |
2451 | delta, hub->mA_per_port, port1); | |
1da177e4 LT |
2452 | remaining -= delta; |
2453 | } | |
2454 | if (remaining < 0) { | |
55c52718 AS |
2455 | dev_warn(hub->intfdev, "%dmA over power budget!\n", |
2456 | - remaining); | |
1da177e4 LT |
2457 | remaining = 0; |
2458 | } | |
2459 | return remaining; | |
2460 | } | |
2461 | ||
2462 | /* Handle physical or logical connection change events. | |
2463 | * This routine is called when: | |
2464 | * a port connection-change occurs; | |
2465 | * a port enable-change occurs (often caused by EMI); | |
2466 | * usb_reset_device() encounters changed descriptors (as from | |
2467 | * a firmware download) | |
2468 | * caller already locked the hub | |
2469 | */ | |
2470 | static void hub_port_connect_change(struct usb_hub *hub, int port1, | |
2471 | u16 portstatus, u16 portchange) | |
2472 | { | |
2473 | struct usb_device *hdev = hub->hdev; | |
2474 | struct device *hub_dev = hub->intfdev; | |
74ad9bd2 | 2475 | u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
1da177e4 LT |
2476 | int status, i; |
2477 | ||
2478 | dev_dbg (hub_dev, | |
2479 | "port %d, status %04x, change %04x, %s\n", | |
2480 | port1, portstatus, portchange, portspeed (portstatus)); | |
2481 | ||
2482 | if (hub->has_indicators) { | |
2483 | set_port_led(hub, port1, HUB_LED_AUTO); | |
2484 | hub->indicator[port1-1] = INDICATOR_AUTO; | |
2485 | } | |
2486 | ||
2487 | /* Disconnect any existing devices under this port */ | |
2488 | if (hdev->children[port1-1]) | |
2489 | usb_disconnect(&hdev->children[port1-1]); | |
2490 | clear_bit(port1, hub->change_bits); | |
2491 | ||
2492 | #ifdef CONFIG_USB_OTG | |
2493 | /* during HNP, don't repeat the debounce */ | |
2494 | if (hdev->bus->is_b_host) | |
2495 | portchange &= ~USB_PORT_STAT_C_CONNECTION; | |
2496 | #endif | |
2497 | ||
2498 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
2499 | status = hub_port_debounce(hub, port1); | |
d4b7d8e8 AS |
2500 | if (status < 0) { |
2501 | if (printk_ratelimit()) | |
2502 | dev_err (hub_dev, "connect-debounce failed, " | |
2503 | "port %d disabled\n", port1); | |
1da177e4 LT |
2504 | goto done; |
2505 | } | |
2506 | portstatus = status; | |
2507 | } | |
2508 | ||
2509 | /* Return now if nothing is connected */ | |
2510 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) { | |
2511 | ||
2512 | /* maybe switch power back on (e.g. root hub was reset) */ | |
74ad9bd2 | 2513 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 |
1da177e4 LT |
2514 | && !(portstatus & (1 << USB_PORT_FEAT_POWER))) |
2515 | set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); | |
2516 | ||
2517 | if (portstatus & USB_PORT_STAT_ENABLE) | |
2518 | goto done; | |
2519 | return; | |
2520 | } | |
2521 | ||
1da177e4 LT |
2522 | for (i = 0; i < SET_CONFIG_TRIES; i++) { |
2523 | struct usb_device *udev; | |
2524 | ||
2525 | /* reallocate for each attempt, since references | |
2526 | * to the previous one can escape in various ways | |
2527 | */ | |
2528 | udev = usb_alloc_dev(hdev, hdev->bus, port1); | |
2529 | if (!udev) { | |
2530 | dev_err (hub_dev, | |
2531 | "couldn't allocate port %d usb_device\n", | |
2532 | port1); | |
2533 | goto done; | |
2534 | } | |
2535 | ||
2536 | usb_set_device_state(udev, USB_STATE_POWERED); | |
2537 | udev->speed = USB_SPEED_UNKNOWN; | |
55c52718 | 2538 | udev->bus_mA = hub->mA_per_port; |
b6956ffa | 2539 | udev->level = hdev->level + 1; |
55c52718 | 2540 | |
1da177e4 LT |
2541 | /* set the address */ |
2542 | choose_address(udev); | |
2543 | if (udev->devnum <= 0) { | |
2544 | status = -ENOTCONN; /* Don't retry */ | |
2545 | goto loop; | |
2546 | } | |
2547 | ||
2548 | /* reset and get descriptor */ | |
2549 | status = hub_port_init(hub, udev, port1, i); | |
2550 | if (status < 0) | |
2551 | goto loop; | |
2552 | ||
2553 | /* consecutive bus-powered hubs aren't reliable; they can | |
2554 | * violate the voltage drop budget. if the new child has | |
2555 | * a "powered" LED, users should notice we didn't enable it | |
2556 | * (without reading syslog), even without per-port LEDs | |
2557 | * on the parent. | |
2558 | */ | |
2559 | if (udev->descriptor.bDeviceClass == USB_CLASS_HUB | |
55c52718 | 2560 | && udev->bus_mA <= 100) { |
1da177e4 LT |
2561 | u16 devstat; |
2562 | ||
2563 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, | |
2564 | &devstat); | |
55c52718 | 2565 | if (status < 2) { |
1da177e4 LT |
2566 | dev_dbg(&udev->dev, "get status %d ?\n", status); |
2567 | goto loop_disable; | |
2568 | } | |
55c52718 | 2569 | le16_to_cpus(&devstat); |
1da177e4 LT |
2570 | if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
2571 | dev_err(&udev->dev, | |
2572 | "can't connect bus-powered hub " | |
2573 | "to this port\n"); | |
2574 | if (hub->has_indicators) { | |
2575 | hub->indicator[port1-1] = | |
2576 | INDICATOR_AMBER_BLINK; | |
c4028958 | 2577 | schedule_delayed_work (&hub->leds, 0); |
1da177e4 LT |
2578 | } |
2579 | status = -ENOTCONN; /* Don't retry */ | |
2580 | goto loop_disable; | |
2581 | } | |
2582 | } | |
2583 | ||
2584 | /* check for devices running slower than they could */ | |
2585 | if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 | |
2586 | && udev->speed == USB_SPEED_FULL | |
2587 | && highspeed_hubs != 0) | |
2588 | check_highspeed (hub, udev, port1); | |
2589 | ||
2590 | /* Store the parent's children[] pointer. At this point | |
2591 | * udev becomes globally accessible, although presumably | |
2592 | * no one will look at it until hdev is unlocked. | |
2593 | */ | |
1da177e4 LT |
2594 | status = 0; |
2595 | ||
2596 | /* We mustn't add new devices if the parent hub has | |
2597 | * been disconnected; we would race with the | |
2598 | * recursively_mark_NOTATTACHED() routine. | |
2599 | */ | |
2600 | spin_lock_irq(&device_state_lock); | |
2601 | if (hdev->state == USB_STATE_NOTATTACHED) | |
2602 | status = -ENOTCONN; | |
2603 | else | |
2604 | hdev->children[port1-1] = udev; | |
2605 | spin_unlock_irq(&device_state_lock); | |
2606 | ||
2607 | /* Run it through the hoops (find a driver, etc) */ | |
2608 | if (!status) { | |
2609 | status = usb_new_device(udev); | |
2610 | if (status) { | |
2611 | spin_lock_irq(&device_state_lock); | |
2612 | hdev->children[port1-1] = NULL; | |
2613 | spin_unlock_irq(&device_state_lock); | |
2614 | } | |
2615 | } | |
2616 | ||
1da177e4 LT |
2617 | if (status) |
2618 | goto loop_disable; | |
2619 | ||
2620 | status = hub_power_remaining(hub); | |
2621 | if (status) | |
55c52718 | 2622 | dev_dbg(hub_dev, "%dmA power budget left\n", status); |
1da177e4 LT |
2623 | |
2624 | return; | |
2625 | ||
2626 | loop_disable: | |
2627 | hub_port_disable(hub, port1, 1); | |
2628 | loop: | |
2629 | ep0_reinit(udev); | |
2630 | release_address(udev); | |
2631 | usb_put_dev(udev); | |
ffcdc18d | 2632 | if ((status == -ENOTCONN) || (status == -ENOTSUPP)) |
1da177e4 LT |
2633 | break; |
2634 | } | |
2635 | ||
2636 | done: | |
2637 | hub_port_disable(hub, port1, 1); | |
2638 | } | |
2639 | ||
2640 | static void hub_events(void) | |
2641 | { | |
2642 | struct list_head *tmp; | |
2643 | struct usb_device *hdev; | |
2644 | struct usb_interface *intf; | |
2645 | struct usb_hub *hub; | |
2646 | struct device *hub_dev; | |
2647 | u16 hubstatus; | |
2648 | u16 hubchange; | |
2649 | u16 portstatus; | |
2650 | u16 portchange; | |
2651 | int i, ret; | |
2652 | int connect_change; | |
2653 | ||
2654 | /* | |
2655 | * We restart the list every time to avoid a deadlock with | |
2656 | * deleting hubs downstream from this one. This should be | |
2657 | * safe since we delete the hub from the event list. | |
2658 | * Not the most efficient, but avoids deadlocks. | |
2659 | */ | |
2660 | while (1) { | |
2661 | ||
2662 | /* Grab the first entry at the beginning of the list */ | |
2663 | spin_lock_irq(&hub_event_lock); | |
2664 | if (list_empty(&hub_event_list)) { | |
2665 | spin_unlock_irq(&hub_event_lock); | |
2666 | break; | |
2667 | } | |
2668 | ||
2669 | tmp = hub_event_list.next; | |
2670 | list_del_init(tmp); | |
2671 | ||
2672 | hub = list_entry(tmp, struct usb_hub, event_list); | |
e8054854 AS |
2673 | kref_get(&hub->kref); |
2674 | spin_unlock_irq(&hub_event_lock); | |
1da177e4 | 2675 | |
e8054854 AS |
2676 | hdev = hub->hdev; |
2677 | hub_dev = hub->intfdev; | |
2678 | intf = to_usb_interface(hub_dev); | |
40f122f3 | 2679 | dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", |
1da177e4 LT |
2680 | hdev->state, hub->descriptor |
2681 | ? hub->descriptor->bNbrPorts | |
2682 | : 0, | |
2683 | /* NOTE: expects max 15 ports... */ | |
2684 | (u16) hub->change_bits[0], | |
40f122f3 | 2685 | (u16) hub->event_bits[0]); |
1da177e4 | 2686 | |
1da177e4 LT |
2687 | /* Lock the device, then check to see if we were |
2688 | * disconnected while waiting for the lock to succeed. */ | |
06b84e8a | 2689 | usb_lock_device(hdev); |
e8054854 | 2690 | if (unlikely(hub->disconnected)) |
1da177e4 LT |
2691 | goto loop; |
2692 | ||
2693 | /* If the hub has died, clean up after it */ | |
2694 | if (hdev->state == USB_STATE_NOTATTACHED) { | |
7de18d8b AS |
2695 | hub->error = -ENODEV; |
2696 | hub_pre_reset(intf); | |
1da177e4 LT |
2697 | goto loop; |
2698 | } | |
2699 | ||
40f122f3 AS |
2700 | /* Autoresume */ |
2701 | ret = usb_autopm_get_interface(intf); | |
2702 | if (ret) { | |
2703 | dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); | |
2704 | goto loop; | |
2705 | } | |
a8e7c565 | 2706 | |
40f122f3 | 2707 | /* If this is an inactive hub, do nothing */ |
1da177e4 | 2708 | if (hub->quiescing) |
40f122f3 | 2709 | goto loop_autopm; |
1da177e4 LT |
2710 | |
2711 | if (hub->error) { | |
2712 | dev_dbg (hub_dev, "resetting for error %d\n", | |
2713 | hub->error); | |
2714 | ||
7de18d8b | 2715 | ret = usb_reset_composite_device(hdev, intf); |
1da177e4 LT |
2716 | if (ret) { |
2717 | dev_dbg (hub_dev, | |
2718 | "error resetting hub: %d\n", ret); | |
40f122f3 | 2719 | goto loop_autopm; |
1da177e4 LT |
2720 | } |
2721 | ||
2722 | hub->nerrors = 0; | |
2723 | hub->error = 0; | |
2724 | } | |
2725 | ||
2726 | /* deal with port status changes */ | |
2727 | for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { | |
2728 | if (test_bit(i, hub->busy_bits)) | |
2729 | continue; | |
2730 | connect_change = test_bit(i, hub->change_bits); | |
2731 | if (!test_and_clear_bit(i, hub->event_bits) && | |
2732 | !connect_change && !hub->activating) | |
2733 | continue; | |
2734 | ||
2735 | ret = hub_port_status(hub, i, | |
2736 | &portstatus, &portchange); | |
2737 | if (ret < 0) | |
2738 | continue; | |
2739 | ||
2740 | if (hub->activating && !hdev->children[i-1] && | |
2741 | (portstatus & | |
2742 | USB_PORT_STAT_CONNECTION)) | |
2743 | connect_change = 1; | |
2744 | ||
2745 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
2746 | clear_port_feature(hdev, i, | |
2747 | USB_PORT_FEAT_C_CONNECTION); | |
2748 | connect_change = 1; | |
2749 | } | |
2750 | ||
2751 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
2752 | if (!connect_change) | |
2753 | dev_dbg (hub_dev, | |
2754 | "port %d enable change, " | |
2755 | "status %08x\n", | |
2756 | i, portstatus); | |
2757 | clear_port_feature(hdev, i, | |
2758 | USB_PORT_FEAT_C_ENABLE); | |
2759 | ||
2760 | /* | |
2761 | * EM interference sometimes causes badly | |
2762 | * shielded USB devices to be shutdown by | |
2763 | * the hub, this hack enables them again. | |
2764 | * Works at least with mouse driver. | |
2765 | */ | |
2766 | if (!(portstatus & USB_PORT_STAT_ENABLE) | |
2767 | && !connect_change | |
2768 | && hdev->children[i-1]) { | |
2769 | dev_err (hub_dev, | |
2770 | "port %i " | |
2771 | "disabled by hub (EMI?), " | |
2772 | "re-enabling...\n", | |
2773 | i); | |
2774 | connect_change = 1; | |
2775 | } | |
2776 | } | |
2777 | ||
2778 | if (portchange & USB_PORT_STAT_C_SUSPEND) { | |
2779 | clear_port_feature(hdev, i, | |
2780 | USB_PORT_FEAT_C_SUSPEND); | |
2781 | if (hdev->children[i-1]) { | |
2782 | ret = remote_wakeup(hdev-> | |
2783 | children[i-1]); | |
2784 | if (ret < 0) | |
2785 | connect_change = 1; | |
2786 | } else { | |
2787 | ret = -ENODEV; | |
2788 | hub_port_disable(hub, i, 1); | |
2789 | } | |
2790 | dev_dbg (hub_dev, | |
2791 | "resume on port %d, status %d\n", | |
2792 | i, ret); | |
2793 | } | |
2794 | ||
2795 | if (portchange & USB_PORT_STAT_C_OVERCURRENT) { | |
2796 | dev_err (hub_dev, | |
2797 | "over-current change on port %d\n", | |
2798 | i); | |
2799 | clear_port_feature(hdev, i, | |
2800 | USB_PORT_FEAT_C_OVER_CURRENT); | |
2801 | hub_power_on(hub); | |
2802 | } | |
2803 | ||
2804 | if (portchange & USB_PORT_STAT_C_RESET) { | |
2805 | dev_dbg (hub_dev, | |
2806 | "reset change on port %d\n", | |
2807 | i); | |
2808 | clear_port_feature(hdev, i, | |
2809 | USB_PORT_FEAT_C_RESET); | |
2810 | } | |
2811 | ||
2812 | if (connect_change) | |
2813 | hub_port_connect_change(hub, i, | |
2814 | portstatus, portchange); | |
2815 | } /* end for i */ | |
2816 | ||
2817 | /* deal with hub status changes */ | |
2818 | if (test_and_clear_bit(0, hub->event_bits) == 0) | |
2819 | ; /* do nothing */ | |
2820 | else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) | |
2821 | dev_err (hub_dev, "get_hub_status failed\n"); | |
2822 | else { | |
2823 | if (hubchange & HUB_CHANGE_LOCAL_POWER) { | |
2824 | dev_dbg (hub_dev, "power change\n"); | |
2825 | clear_hub_feature(hdev, C_HUB_LOCAL_POWER); | |
55c52718 AS |
2826 | if (hubstatus & HUB_STATUS_LOCAL_POWER) |
2827 | /* FIXME: Is this always true? */ | |
2828 | hub->limited_power = 0; | |
2829 | else | |
2830 | hub->limited_power = 1; | |
1da177e4 LT |
2831 | } |
2832 | if (hubchange & HUB_CHANGE_OVERCURRENT) { | |
2833 | dev_dbg (hub_dev, "overcurrent change\n"); | |
2834 | msleep(500); /* Cool down */ | |
2835 | clear_hub_feature(hdev, C_HUB_OVER_CURRENT); | |
2836 | hub_power_on(hub); | |
2837 | } | |
2838 | } | |
2839 | ||
2840 | hub->activating = 0; | |
2841 | ||
d5926ae7 AS |
2842 | /* If this is a root hub, tell the HCD it's okay to |
2843 | * re-enable port-change interrupts now. */ | |
d5cbad4b | 2844 | if (!hdev->parent && !hub->busy_bits[0]) |
d5926ae7 AS |
2845 | usb_enable_root_hub_irq(hdev->bus); |
2846 | ||
40f122f3 AS |
2847 | loop_autopm: |
2848 | /* Allow autosuspend if we're not going to run again */ | |
2849 | if (list_empty(&hub->event_list)) | |
2850 | usb_autopm_enable(intf); | |
1da177e4 LT |
2851 | loop: |
2852 | usb_unlock_device(hdev); | |
e8054854 | 2853 | kref_put(&hub->kref, hub_release); |
1da177e4 LT |
2854 | |
2855 | } /* end while (1) */ | |
2856 | } | |
2857 | ||
2858 | static int hub_thread(void *__unused) | |
2859 | { | |
83144186 | 2860 | set_freezable(); |
1da177e4 LT |
2861 | do { |
2862 | hub_events(); | |
9c8d6178 | 2863 | wait_event_interruptible(khubd_wait, |
2864 | !list_empty(&hub_event_list) || | |
2865 | kthread_should_stop()); | |
3e1d1d28 | 2866 | try_to_freeze(); |
9c8d6178 | 2867 | } while (!kthread_should_stop() || !list_empty(&hub_event_list)); |
1da177e4 | 2868 | |
9c8d6178 | 2869 | pr_debug("%s: khubd exiting\n", usbcore_name); |
2870 | return 0; | |
1da177e4 LT |
2871 | } |
2872 | ||
2873 | static struct usb_device_id hub_id_table [] = { | |
2874 | { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, | |
2875 | .bDeviceClass = USB_CLASS_HUB}, | |
2876 | { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, | |
2877 | .bInterfaceClass = USB_CLASS_HUB}, | |
2878 | { } /* Terminating entry */ | |
2879 | }; | |
2880 | ||
2881 | MODULE_DEVICE_TABLE (usb, hub_id_table); | |
2882 | ||
2883 | static struct usb_driver hub_driver = { | |
1da177e4 LT |
2884 | .name = "hub", |
2885 | .probe = hub_probe, | |
2886 | .disconnect = hub_disconnect, | |
2887 | .suspend = hub_suspend, | |
2888 | .resume = hub_resume, | |
f07600cf | 2889 | .reset_resume = hub_reset_resume, |
7de18d8b AS |
2890 | .pre_reset = hub_pre_reset, |
2891 | .post_reset = hub_post_reset, | |
1da177e4 LT |
2892 | .ioctl = hub_ioctl, |
2893 | .id_table = hub_id_table, | |
40f122f3 | 2894 | .supports_autosuspend = 1, |
1da177e4 LT |
2895 | }; |
2896 | ||
2897 | int usb_hub_init(void) | |
2898 | { | |
1da177e4 LT |
2899 | if (usb_register(&hub_driver) < 0) { |
2900 | printk(KERN_ERR "%s: can't register hub driver\n", | |
2901 | usbcore_name); | |
2902 | return -1; | |
2903 | } | |
2904 | ||
9c8d6178 | 2905 | khubd_task = kthread_run(hub_thread, NULL, "khubd"); |
2906 | if (!IS_ERR(khubd_task)) | |
1da177e4 | 2907 | return 0; |
1da177e4 LT |
2908 | |
2909 | /* Fall through if kernel_thread failed */ | |
2910 | usb_deregister(&hub_driver); | |
2911 | printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); | |
2912 | ||
2913 | return -1; | |
2914 | } | |
2915 | ||
2916 | void usb_hub_cleanup(void) | |
2917 | { | |
9c8d6178 | 2918 | kthread_stop(khubd_task); |
1da177e4 LT |
2919 | |
2920 | /* | |
2921 | * Hub resources are freed for us by usb_deregister. It calls | |
2922 | * usb_driver_purge on every device which in turn calls that | |
2923 | * devices disconnect function if it is using this driver. | |
2924 | * The hub_disconnect function takes care of releasing the | |
2925 | * individual hub resources. -greg | |
2926 | */ | |
2927 | usb_deregister(&hub_driver); | |
2928 | } /* usb_hub_cleanup() */ | |
2929 | ||
1da177e4 LT |
2930 | static int config_descriptors_changed(struct usb_device *udev) |
2931 | { | |
2932 | unsigned index; | |
2933 | unsigned len = 0; | |
2934 | struct usb_config_descriptor *buf; | |
2935 | ||
2936 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { | |
2937 | if (len < le16_to_cpu(udev->config[index].desc.wTotalLength)) | |
2938 | len = le16_to_cpu(udev->config[index].desc.wTotalLength); | |
2939 | } | |
e94b1766 | 2940 | buf = kmalloc (len, GFP_KERNEL); |
1da177e4 LT |
2941 | if (buf == NULL) { |
2942 | dev_err(&udev->dev, "no mem to re-read configs after reset\n"); | |
2943 | /* assume the worst */ | |
2944 | return 1; | |
2945 | } | |
2946 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { | |
2947 | int length; | |
2948 | int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); | |
2949 | ||
2950 | length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, | |
2951 | old_length); | |
2952 | if (length < old_length) { | |
2953 | dev_dbg(&udev->dev, "config index %d, error %d\n", | |
2954 | index, length); | |
2955 | break; | |
2956 | } | |
2957 | if (memcmp (buf, udev->rawdescriptors[index], old_length) | |
2958 | != 0) { | |
2959 | dev_dbg(&udev->dev, "config index %d changed (#%d)\n", | |
2960 | index, buf->bConfigurationValue); | |
2961 | break; | |
2962 | } | |
2963 | } | |
2964 | kfree(buf); | |
2965 | return index != udev->descriptor.bNumConfigurations; | |
2966 | } | |
2967 | ||
2968 | /** | |
2969 | * usb_reset_device - perform a USB port reset to reinitialize a device | |
2970 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) | |
2971 | * | |
79efa097 AS |
2972 | * WARNING - don't use this routine to reset a composite device |
2973 | * (one with multiple interfaces owned by separate drivers)! | |
2974 | * Use usb_reset_composite_device() instead. | |
1da177e4 LT |
2975 | * |
2976 | * Do a port reset, reassign the device's address, and establish its | |
2977 | * former operating configuration. If the reset fails, or the device's | |
2978 | * descriptors change from their values before the reset, or the original | |
2979 | * configuration and altsettings cannot be restored, a flag will be set | |
2980 | * telling khubd to pretend the device has been disconnected and then | |
2981 | * re-connected. All drivers will be unbound, and the device will be | |
2982 | * re-enumerated and probed all over again. | |
2983 | * | |
2984 | * Returns 0 if the reset succeeded, -ENODEV if the device has been | |
2985 | * flagged for logical disconnection, or some other negative error code | |
2986 | * if the reset wasn't even attempted. | |
2987 | * | |
2988 | * The caller must own the device lock. For example, it's safe to use | |
2989 | * this from a driver probe() routine after downloading new firmware. | |
2990 | * For calls that might not occur during probe(), drivers should lock | |
2991 | * the device using usb_lock_device_for_reset(). | |
6bc6cff5 AS |
2992 | * |
2993 | * Locking exception: This routine may also be called from within an | |
2994 | * autoresume handler. Such usage won't conflict with other tasks | |
2995 | * holding the device lock because these tasks should always call | |
2996 | * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. | |
1da177e4 LT |
2997 | */ |
2998 | int usb_reset_device(struct usb_device *udev) | |
2999 | { | |
3000 | struct usb_device *parent_hdev = udev->parent; | |
3001 | struct usb_hub *parent_hub; | |
3002 | struct usb_device_descriptor descriptor = udev->descriptor; | |
12c3da34 AS |
3003 | int i, ret = 0; |
3004 | int port1 = udev->portnum; | |
1da177e4 LT |
3005 | |
3006 | if (udev->state == USB_STATE_NOTATTACHED || | |
3007 | udev->state == USB_STATE_SUSPENDED) { | |
3008 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
3009 | udev->state); | |
3010 | return -EINVAL; | |
3011 | } | |
3012 | ||
3013 | if (!parent_hdev) { | |
3014 | /* this requires hcd-specific logic; see OHCI hc_restart() */ | |
3015 | dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__); | |
3016 | return -EISDIR; | |
3017 | } | |
1da177e4 LT |
3018 | parent_hub = hdev_to_hub(parent_hdev); |
3019 | ||
1da177e4 LT |
3020 | set_bit(port1, parent_hub->busy_bits); |
3021 | for (i = 0; i < SET_CONFIG_TRIES; ++i) { | |
3022 | ||
3023 | /* ep0 maxpacket size may change; let the HCD know about it. | |
3024 | * Other endpoints will be handled by re-enumeration. */ | |
3025 | ep0_reinit(udev); | |
3026 | ret = hub_port_init(parent_hub, udev, port1, i); | |
dd4dd19e | 3027 | if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) |
1da177e4 LT |
3028 | break; |
3029 | } | |
3030 | clear_bit(port1, parent_hub->busy_bits); | |
d5cbad4b AS |
3031 | if (!parent_hdev->parent && !parent_hub->busy_bits[0]) |
3032 | usb_enable_root_hub_irq(parent_hdev->bus); | |
3033 | ||
1da177e4 LT |
3034 | if (ret < 0) |
3035 | goto re_enumerate; | |
3036 | ||
3037 | /* Device might have changed firmware (DFU or similar) */ | |
3038 | if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor) | |
3039 | || config_descriptors_changed (udev)) { | |
3040 | dev_info(&udev->dev, "device firmware changed\n"); | |
3041 | udev->descriptor = descriptor; /* for disconnect() calls */ | |
3042 | goto re_enumerate; | |
3043 | } | |
3044 | ||
3045 | if (!udev->actconfig) | |
3046 | goto done; | |
3047 | ||
3048 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3049 | USB_REQ_SET_CONFIGURATION, 0, | |
3050 | udev->actconfig->desc.bConfigurationValue, 0, | |
3051 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
3052 | if (ret < 0) { | |
3053 | dev_err(&udev->dev, | |
3054 | "can't restore configuration #%d (error=%d)\n", | |
3055 | udev->actconfig->desc.bConfigurationValue, ret); | |
3056 | goto re_enumerate; | |
3057 | } | |
3058 | usb_set_device_state(udev, USB_STATE_CONFIGURED); | |
3059 | ||
3060 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { | |
3061 | struct usb_interface *intf = udev->actconfig->interface[i]; | |
3062 | struct usb_interface_descriptor *desc; | |
3063 | ||
3064 | /* set_interface resets host side toggle even | |
3065 | * for altsetting zero. the interface may have no driver. | |
3066 | */ | |
3067 | desc = &intf->cur_altsetting->desc; | |
3068 | ret = usb_set_interface(udev, desc->bInterfaceNumber, | |
3069 | desc->bAlternateSetting); | |
3070 | if (ret < 0) { | |
3071 | dev_err(&udev->dev, "failed to restore interface %d " | |
3072 | "altsetting %d (error=%d)\n", | |
3073 | desc->bInterfaceNumber, | |
3074 | desc->bAlternateSetting, | |
3075 | ret); | |
3076 | goto re_enumerate; | |
3077 | } | |
3078 | } | |
3079 | ||
3080 | done: | |
1da177e4 LT |
3081 | return 0; |
3082 | ||
3083 | re_enumerate: | |
3084 | hub_port_logical_disconnect(parent_hub, port1); | |
3085 | return -ENODEV; | |
3086 | } | |
140d8f68 | 3087 | EXPORT_SYMBOL(usb_reset_device); |
79efa097 AS |
3088 | |
3089 | /** | |
3090 | * usb_reset_composite_device - warn interface drivers and perform a USB port reset | |
3091 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) | |
3092 | * @iface: interface bound to the driver making the request (optional) | |
3093 | * | |
3094 | * Warns all drivers bound to registered interfaces (using their pre_reset | |
3095 | * method), performs the port reset, and then lets the drivers know that | |
3096 | * the reset is over (using their post_reset method). | |
3097 | * | |
3098 | * Return value is the same as for usb_reset_device(). | |
3099 | * | |
3100 | * The caller must own the device lock. For example, it's safe to use | |
3101 | * this from a driver probe() routine after downloading new firmware. | |
3102 | * For calls that might not occur during probe(), drivers should lock | |
3103 | * the device using usb_lock_device_for_reset(). | |
3104 | * | |
3105 | * The interface locks are acquired during the pre_reset stage and released | |
3106 | * during the post_reset stage. However if iface is not NULL and is | |
3107 | * currently being probed, we assume that the caller already owns its | |
3108 | * lock. | |
3109 | */ | |
3110 | int usb_reset_composite_device(struct usb_device *udev, | |
3111 | struct usb_interface *iface) | |
3112 | { | |
3113 | int ret; | |
3114 | struct usb_host_config *config = udev->actconfig; | |
3115 | ||
3116 | if (udev->state == USB_STATE_NOTATTACHED || | |
3117 | udev->state == USB_STATE_SUSPENDED) { | |
3118 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
3119 | udev->state); | |
3120 | return -EINVAL; | |
3121 | } | |
3122 | ||
645daaab | 3123 | /* Prevent autosuspend during the reset */ |
94fcda1f | 3124 | usb_autoresume_device(udev); |
645daaab | 3125 | |
79efa097 AS |
3126 | if (iface && iface->condition != USB_INTERFACE_BINDING) |
3127 | iface = NULL; | |
3128 | ||
3129 | if (config) { | |
3130 | int i; | |
3131 | struct usb_interface *cintf; | |
3132 | struct usb_driver *drv; | |
3133 | ||
3134 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { | |
3135 | cintf = config->interface[i]; | |
3136 | if (cintf != iface) | |
3137 | down(&cintf->dev.sem); | |
3138 | if (device_is_registered(&cintf->dev) && | |
3139 | cintf->dev.driver) { | |
3140 | drv = to_usb_driver(cintf->dev.driver); | |
3141 | if (drv->pre_reset) | |
3142 | (drv->pre_reset)(cintf); | |
f07600cf | 3143 | /* FIXME: Unbind if pre_reset returns an error or isn't defined */ |
79efa097 AS |
3144 | } |
3145 | } | |
3146 | } | |
3147 | ||
3148 | ret = usb_reset_device(udev); | |
3149 | ||
3150 | if (config) { | |
3151 | int i; | |
3152 | struct usb_interface *cintf; | |
3153 | struct usb_driver *drv; | |
3154 | ||
3155 | for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { | |
3156 | cintf = config->interface[i]; | |
3157 | if (device_is_registered(&cintf->dev) && | |
3158 | cintf->dev.driver) { | |
3159 | drv = to_usb_driver(cintf->dev.driver); | |
3160 | if (drv->post_reset) | |
f07600cf AS |
3161 | (drv->post_reset)(cintf); |
3162 | /* FIXME: Unbind if post_reset returns an error or isn't defined */ | |
79efa097 AS |
3163 | } |
3164 | if (cintf != iface) | |
3165 | up(&cintf->dev.sem); | |
3166 | } | |
3167 | } | |
3168 | ||
94fcda1f | 3169 | usb_autosuspend_device(udev); |
79efa097 AS |
3170 | return ret; |
3171 | } | |
140d8f68 | 3172 | EXPORT_SYMBOL(usb_reset_composite_device); |