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Commit | Line | Data |
---|---|---|
afba937e ON |
1 | /* |
2 | * cdc-wdm.c | |
3 | * | |
4 | * This driver supports USB CDC WCM Device Management. | |
5 | * | |
052fbc0d | 6 | * Copyright (c) 2007-2009 Oliver Neukum |
afba937e ON |
7 | * |
8 | * Some code taken from cdc-acm.c | |
9 | * | |
10 | * Released under the GPLv2. | |
11 | * | |
12 | * Many thanks to Carl Nordbeck | |
13 | */ | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/errno.h> | |
3edce1cf | 16 | #include <linux/ioctl.h> |
afba937e ON |
17 | #include <linux/slab.h> |
18 | #include <linux/module.h> | |
afba937e ON |
19 | #include <linux/mutex.h> |
20 | #include <linux/uaccess.h> | |
21 | #include <linux/bitops.h> | |
22 | #include <linux/poll.h> | |
23 | #include <linux/usb.h> | |
24 | #include <linux/usb/cdc.h> | |
25 | #include <asm/byteorder.h> | |
26 | #include <asm/unaligned.h> | |
3cc36157 | 27 | #include <linux/usb/cdc-wdm.h> |
afba937e ON |
28 | |
29 | /* | |
30 | * Version Information | |
31 | */ | |
87d65e54 | 32 | #define DRIVER_VERSION "v0.03" |
afba937e | 33 | #define DRIVER_AUTHOR "Oliver Neukum" |
87d65e54 | 34 | #define DRIVER_DESC "USB Abstract Control Model driver for USB WCM Device Management" |
afba937e | 35 | |
6ef4852b | 36 | static const struct usb_device_id wdm_ids[] = { |
afba937e ON |
37 | { |
38 | .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS | | |
39 | USB_DEVICE_ID_MATCH_INT_SUBCLASS, | |
40 | .bInterfaceClass = USB_CLASS_COMM, | |
41 | .bInterfaceSubClass = USB_CDC_SUBCLASS_DMM | |
42 | }, | |
43 | { } | |
44 | }; | |
45 | ||
aa5380b9 ON |
46 | MODULE_DEVICE_TABLE (usb, wdm_ids); |
47 | ||
afba937e ON |
48 | #define WDM_MINOR_BASE 176 |
49 | ||
50 | ||
51 | #define WDM_IN_USE 1 | |
52 | #define WDM_DISCONNECTING 2 | |
53 | #define WDM_RESULT 3 | |
54 | #define WDM_READ 4 | |
55 | #define WDM_INT_STALL 5 | |
56 | #define WDM_POLL_RUNNING 6 | |
922a5ead | 57 | #define WDM_RESPONDING 7 |
beb1d35f | 58 | #define WDM_SUSPENDING 8 |
88044202 | 59 | #define WDM_RESETTING 9 |
c0f5ecee | 60 | #define WDM_OVERFLOW 10 |
afba937e ON |
61 | |
62 | #define WDM_MAX 16 | |
63 | ||
7e3054a0 BM |
64 | /* CDC-WMC r1.1 requires wMaxCommand to be "at least 256 decimal (0x100)" */ |
65 | #define WDM_DEFAULT_BUFSIZE 256 | |
afba937e ON |
66 | |
67 | static DEFINE_MUTEX(wdm_mutex); | |
b0c13860 BM |
68 | static DEFINE_SPINLOCK(wdm_device_list_lock); |
69 | static LIST_HEAD(wdm_device_list); | |
afba937e ON |
70 | |
71 | /* --- method tables --- */ | |
72 | ||
73 | struct wdm_device { | |
74 | u8 *inbuf; /* buffer for response */ | |
75 | u8 *outbuf; /* buffer for command */ | |
76 | u8 *sbuf; /* buffer for status */ | |
77 | u8 *ubuf; /* buffer for copy to user space */ | |
78 | ||
79 | struct urb *command; | |
80 | struct urb *response; | |
81 | struct urb *validity; | |
82 | struct usb_interface *intf; | |
83 | struct usb_ctrlrequest *orq; | |
84 | struct usb_ctrlrequest *irq; | |
85 | spinlock_t iuspin; | |
86 | ||
87 | unsigned long flags; | |
88 | u16 bufsize; | |
89 | u16 wMaxCommand; | |
90 | u16 wMaxPacketSize; | |
afba937e ON |
91 | __le16 inum; |
92 | int reslength; | |
93 | int length; | |
94 | int read; | |
95 | int count; | |
96 | dma_addr_t shandle; | |
97 | dma_addr_t ihandle; | |
e8537bd2 BM |
98 | struct mutex wlock; |
99 | struct mutex rlock; | |
afba937e ON |
100 | wait_queue_head_t wait; |
101 | struct work_struct rxwork; | |
102 | int werr; | |
103 | int rerr; | |
73e06865 | 104 | int resp_count; |
b0c13860 BM |
105 | |
106 | struct list_head device_list; | |
3cc36157 | 107 | int (*manage_power)(struct usb_interface *, int); |
afba937e ON |
108 | }; |
109 | ||
110 | static struct usb_driver wdm_driver; | |
111 | ||
b0c13860 BM |
112 | /* return intfdata if we own the interface, else look up intf in the list */ |
113 | static struct wdm_device *wdm_find_device(struct usb_interface *intf) | |
114 | { | |
6a448868 | 115 | struct wdm_device *desc; |
b0c13860 BM |
116 | |
117 | spin_lock(&wdm_device_list_lock); | |
118 | list_for_each_entry(desc, &wdm_device_list, device_list) | |
119 | if (desc->intf == intf) | |
6a448868 BM |
120 | goto found; |
121 | desc = NULL; | |
122 | found: | |
b0c13860 BM |
123 | spin_unlock(&wdm_device_list_lock); |
124 | ||
125 | return desc; | |
126 | } | |
127 | ||
128 | static struct wdm_device *wdm_find_device_by_minor(int minor) | |
129 | { | |
6a448868 | 130 | struct wdm_device *desc; |
b0c13860 BM |
131 | |
132 | spin_lock(&wdm_device_list_lock); | |
133 | list_for_each_entry(desc, &wdm_device_list, device_list) | |
134 | if (desc->intf->minor == minor) | |
6a448868 BM |
135 | goto found; |
136 | desc = NULL; | |
137 | found: | |
b0c13860 BM |
138 | spin_unlock(&wdm_device_list_lock); |
139 | ||
140 | return desc; | |
141 | } | |
142 | ||
afba937e ON |
143 | /* --- callbacks --- */ |
144 | static void wdm_out_callback(struct urb *urb) | |
145 | { | |
146 | struct wdm_device *desc; | |
147 | desc = urb->context; | |
148 | spin_lock(&desc->iuspin); | |
149 | desc->werr = urb->status; | |
150 | spin_unlock(&desc->iuspin); | |
afba937e | 151 | kfree(desc->outbuf); |
5c22837a ON |
152 | desc->outbuf = NULL; |
153 | clear_bit(WDM_IN_USE, &desc->flags); | |
afba937e ON |
154 | wake_up(&desc->wait); |
155 | } | |
156 | ||
157 | static void wdm_in_callback(struct urb *urb) | |
158 | { | |
159 | struct wdm_device *desc = urb->context; | |
160 | int status = urb->status; | |
c0f5ecee | 161 | int length = urb->actual_length; |
afba937e ON |
162 | |
163 | spin_lock(&desc->iuspin); | |
922a5ead | 164 | clear_bit(WDM_RESPONDING, &desc->flags); |
afba937e ON |
165 | |
166 | if (status) { | |
167 | switch (status) { | |
168 | case -ENOENT: | |
169 | dev_dbg(&desc->intf->dev, | |
170 | "nonzero urb status received: -ENOENT"); | |
922a5ead | 171 | goto skip_error; |
afba937e ON |
172 | case -ECONNRESET: |
173 | dev_dbg(&desc->intf->dev, | |
174 | "nonzero urb status received: -ECONNRESET"); | |
922a5ead | 175 | goto skip_error; |
afba937e ON |
176 | case -ESHUTDOWN: |
177 | dev_dbg(&desc->intf->dev, | |
178 | "nonzero urb status received: -ESHUTDOWN"); | |
922a5ead | 179 | goto skip_error; |
afba937e | 180 | case -EPIPE: |
9908a32e GKH |
181 | dev_err(&desc->intf->dev, |
182 | "nonzero urb status received: -EPIPE\n"); | |
afba937e ON |
183 | break; |
184 | default: | |
9908a32e GKH |
185 | dev_err(&desc->intf->dev, |
186 | "Unexpected error %d\n", status); | |
afba937e ON |
187 | break; |
188 | } | |
189 | } | |
190 | ||
191 | desc->rerr = status; | |
c0f5ecee ON |
192 | if (length + desc->length > desc->wMaxCommand) { |
193 | /* The buffer would overflow */ | |
194 | set_bit(WDM_OVERFLOW, &desc->flags); | |
195 | } else { | |
196 | /* we may already be in overflow */ | |
197 | if (!test_bit(WDM_OVERFLOW, &desc->flags)) { | |
198 | memmove(desc->ubuf + desc->length, desc->inbuf, length); | |
199 | desc->length += length; | |
200 | desc->reslength = length; | |
201 | } | |
202 | } | |
922a5ead | 203 | skip_error: |
afba937e ON |
204 | wake_up(&desc->wait); |
205 | ||
206 | set_bit(WDM_READ, &desc->flags); | |
207 | spin_unlock(&desc->iuspin); | |
208 | } | |
209 | ||
210 | static void wdm_int_callback(struct urb *urb) | |
211 | { | |
212 | int rv = 0; | |
6dd433e6 | 213 | int responding; |
afba937e ON |
214 | int status = urb->status; |
215 | struct wdm_device *desc; | |
afba937e ON |
216 | struct usb_cdc_notification *dr; |
217 | ||
218 | desc = urb->context; | |
afba937e ON |
219 | dr = (struct usb_cdc_notification *)desc->sbuf; |
220 | ||
221 | if (status) { | |
222 | switch (status) { | |
223 | case -ESHUTDOWN: | |
224 | case -ENOENT: | |
225 | case -ECONNRESET: | |
226 | return; /* unplug */ | |
227 | case -EPIPE: | |
228 | set_bit(WDM_INT_STALL, &desc->flags); | |
9908a32e | 229 | dev_err(&desc->intf->dev, "Stall on int endpoint\n"); |
afba937e ON |
230 | goto sw; /* halt is cleared in work */ |
231 | default: | |
9908a32e GKH |
232 | dev_err(&desc->intf->dev, |
233 | "nonzero urb status received: %d\n", status); | |
afba937e ON |
234 | break; |
235 | } | |
236 | } | |
237 | ||
238 | if (urb->actual_length < sizeof(struct usb_cdc_notification)) { | |
9908a32e GKH |
239 | dev_err(&desc->intf->dev, "wdm_int_callback - %d bytes\n", |
240 | urb->actual_length); | |
afba937e ON |
241 | goto exit; |
242 | } | |
243 | ||
244 | switch (dr->bNotificationType) { | |
245 | case USB_CDC_NOTIFY_RESPONSE_AVAILABLE: | |
246 | dev_dbg(&desc->intf->dev, | |
247 | "NOTIFY_RESPONSE_AVAILABLE received: index %d len %d", | |
248 | dr->wIndex, dr->wLength); | |
249 | break; | |
250 | ||
251 | case USB_CDC_NOTIFY_NETWORK_CONNECTION: | |
252 | ||
253 | dev_dbg(&desc->intf->dev, | |
254 | "NOTIFY_NETWORK_CONNECTION %s network", | |
255 | dr->wValue ? "connected to" : "disconnected from"); | |
256 | goto exit; | |
257 | default: | |
258 | clear_bit(WDM_POLL_RUNNING, &desc->flags); | |
9908a32e GKH |
259 | dev_err(&desc->intf->dev, |
260 | "unknown notification %d received: index %d len %d\n", | |
afba937e ON |
261 | dr->bNotificationType, dr->wIndex, dr->wLength); |
262 | goto exit; | |
263 | } | |
264 | ||
afba937e | 265 | spin_lock(&desc->iuspin); |
6dd433e6 | 266 | responding = test_and_set_bit(WDM_RESPONDING, &desc->flags); |
73e06865 GS |
267 | if (!desc->resp_count++ && !responding |
268 | && !test_bit(WDM_DISCONNECTING, &desc->flags) | |
beb1d35f | 269 | && !test_bit(WDM_SUSPENDING, &desc->flags)) { |
afba937e ON |
270 | rv = usb_submit_urb(desc->response, GFP_ATOMIC); |
271 | dev_dbg(&desc->intf->dev, "%s: usb_submit_urb %d", | |
272 | __func__, rv); | |
273 | } | |
274 | spin_unlock(&desc->iuspin); | |
275 | if (rv < 0) { | |
922a5ead | 276 | clear_bit(WDM_RESPONDING, &desc->flags); |
afba937e ON |
277 | if (rv == -EPERM) |
278 | return; | |
279 | if (rv == -ENOMEM) { | |
280 | sw: | |
281 | rv = schedule_work(&desc->rxwork); | |
282 | if (rv) | |
9908a32e GKH |
283 | dev_err(&desc->intf->dev, |
284 | "Cannot schedule work\n"); | |
afba937e ON |
285 | } |
286 | } | |
287 | exit: | |
288 | rv = usb_submit_urb(urb, GFP_ATOMIC); | |
289 | if (rv) | |
9908a32e GKH |
290 | dev_err(&desc->intf->dev, |
291 | "%s - usb_submit_urb failed with result %d\n", | |
292 | __func__, rv); | |
afba937e ON |
293 | |
294 | } | |
295 | ||
296 | static void kill_urbs(struct wdm_device *desc) | |
297 | { | |
17d80d56 | 298 | /* the order here is essential */ |
afba937e ON |
299 | usb_kill_urb(desc->command); |
300 | usb_kill_urb(desc->validity); | |
301 | usb_kill_urb(desc->response); | |
302 | } | |
303 | ||
304 | static void free_urbs(struct wdm_device *desc) | |
305 | { | |
306 | usb_free_urb(desc->validity); | |
307 | usb_free_urb(desc->response); | |
308 | usb_free_urb(desc->command); | |
309 | } | |
310 | ||
311 | static void cleanup(struct wdm_device *desc) | |
312 | { | |
8457d99c BM |
313 | kfree(desc->sbuf); |
314 | kfree(desc->inbuf); | |
afba937e ON |
315 | kfree(desc->orq); |
316 | kfree(desc->irq); | |
317 | kfree(desc->ubuf); | |
318 | free_urbs(desc); | |
319 | kfree(desc); | |
320 | } | |
321 | ||
322 | static ssize_t wdm_write | |
323 | (struct file *file, const char __user *buffer, size_t count, loff_t *ppos) | |
324 | { | |
325 | u8 *buf; | |
326 | int rv = -EMSGSIZE, r, we; | |
327 | struct wdm_device *desc = file->private_data; | |
328 | struct usb_ctrlrequest *req; | |
329 | ||
330 | if (count > desc->wMaxCommand) | |
331 | count = desc->wMaxCommand; | |
332 | ||
333 | spin_lock_irq(&desc->iuspin); | |
334 | we = desc->werr; | |
335 | desc->werr = 0; | |
336 | spin_unlock_irq(&desc->iuspin); | |
337 | if (we < 0) | |
338 | return -EIO; | |
339 | ||
5c22837a | 340 | buf = kmalloc(count, GFP_KERNEL); |
860e41a7 ON |
341 | if (!buf) { |
342 | rv = -ENOMEM; | |
343 | goto outnl; | |
344 | } | |
345 | ||
346 | r = copy_from_user(buf, buffer, count); | |
347 | if (r > 0) { | |
348 | kfree(buf); | |
349 | rv = -EFAULT; | |
350 | goto outnl; | |
351 | } | |
352 | ||
353 | /* concurrent writes and disconnect */ | |
e8537bd2 | 354 | r = mutex_lock_interruptible(&desc->wlock); |
afba937e | 355 | rv = -ERESTARTSYS; |
860e41a7 ON |
356 | if (r) { |
357 | kfree(buf); | |
afba937e | 358 | goto outnl; |
860e41a7 ON |
359 | } |
360 | ||
361 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
362 | kfree(buf); | |
363 | rv = -ENODEV; | |
364 | goto outnp; | |
365 | } | |
afba937e | 366 | |
17d80d56 | 367 | r = usb_autopm_get_interface(desc->intf); |
860e41a7 ON |
368 | if (r < 0) { |
369 | kfree(buf); | |
12a98b2b | 370 | rv = usb_translate_errors(r); |
17d80d56 | 371 | goto outnp; |
860e41a7 | 372 | } |
7f1dc313 | 373 | |
0cdfb819 | 374 | if (!(file->f_flags & O_NONBLOCK)) |
7f1dc313 ON |
375 | r = wait_event_interruptible(desc->wait, !test_bit(WDM_IN_USE, |
376 | &desc->flags)); | |
377 | else | |
378 | if (test_bit(WDM_IN_USE, &desc->flags)) | |
379 | r = -EAGAIN; | |
88044202 BM |
380 | |
381 | if (test_bit(WDM_RESETTING, &desc->flags)) | |
382 | r = -EIO; | |
383 | ||
860e41a7 | 384 | if (r < 0) { |
afba937e | 385 | kfree(buf); |
12a98b2b | 386 | rv = r; |
afba937e ON |
387 | goto out; |
388 | } | |
389 | ||
390 | req = desc->orq; | |
391 | usb_fill_control_urb( | |
392 | desc->command, | |
393 | interface_to_usbdev(desc->intf), | |
394 | /* using common endpoint 0 */ | |
395 | usb_sndctrlpipe(interface_to_usbdev(desc->intf), 0), | |
396 | (unsigned char *)req, | |
397 | buf, | |
398 | count, | |
399 | wdm_out_callback, | |
400 | desc | |
401 | ); | |
402 | ||
403 | req->bRequestType = (USB_DIR_OUT | USB_TYPE_CLASS | | |
404 | USB_RECIP_INTERFACE); | |
405 | req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND; | |
406 | req->wValue = 0; | |
407 | req->wIndex = desc->inum; | |
408 | req->wLength = cpu_to_le16(count); | |
409 | set_bit(WDM_IN_USE, &desc->flags); | |
5c22837a | 410 | desc->outbuf = buf; |
afba937e ON |
411 | |
412 | rv = usb_submit_urb(desc->command, GFP_KERNEL); | |
413 | if (rv < 0) { | |
414 | kfree(buf); | |
5c22837a | 415 | desc->outbuf = NULL; |
afba937e | 416 | clear_bit(WDM_IN_USE, &desc->flags); |
9908a32e | 417 | dev_err(&desc->intf->dev, "Tx URB error: %d\n", rv); |
12a98b2b | 418 | rv = usb_translate_errors(rv); |
afba937e ON |
419 | } else { |
420 | dev_dbg(&desc->intf->dev, "Tx URB has been submitted index=%d", | |
421 | req->wIndex); | |
422 | } | |
423 | out: | |
17d80d56 ON |
424 | usb_autopm_put_interface(desc->intf); |
425 | outnp: | |
e8537bd2 | 426 | mutex_unlock(&desc->wlock); |
afba937e ON |
427 | outnl: |
428 | return rv < 0 ? rv : count; | |
429 | } | |
430 | ||
431 | static ssize_t wdm_read | |
432 | (struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
433 | { | |
711c68b3 | 434 | int rv, cntr; |
afba937e ON |
435 | int i = 0; |
436 | struct wdm_device *desc = file->private_data; | |
437 | ||
438 | ||
e8537bd2 | 439 | rv = mutex_lock_interruptible(&desc->rlock); /*concurrent reads */ |
afba937e ON |
440 | if (rv < 0) |
441 | return -ERESTARTSYS; | |
442 | ||
711c68b3 BH |
443 | cntr = ACCESS_ONCE(desc->length); |
444 | if (cntr == 0) { | |
afba937e ON |
445 | desc->read = 0; |
446 | retry: | |
7f1dc313 ON |
447 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { |
448 | rv = -ENODEV; | |
449 | goto err; | |
450 | } | |
c0f5ecee ON |
451 | if (test_bit(WDM_OVERFLOW, &desc->flags)) { |
452 | clear_bit(WDM_OVERFLOW, &desc->flags); | |
453 | rv = -ENOBUFS; | |
454 | goto err; | |
455 | } | |
afba937e | 456 | i++; |
7f1dc313 ON |
457 | if (file->f_flags & O_NONBLOCK) { |
458 | if (!test_bit(WDM_READ, &desc->flags)) { | |
459 | rv = cntr ? cntr : -EAGAIN; | |
460 | goto err; | |
461 | } | |
462 | rv = 0; | |
463 | } else { | |
464 | rv = wait_event_interruptible(desc->wait, | |
465 | test_bit(WDM_READ, &desc->flags)); | |
466 | } | |
afba937e | 467 | |
7f1dc313 | 468 | /* may have happened while we slept */ |
17d80d56 ON |
469 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { |
470 | rv = -ENODEV; | |
471 | goto err; | |
472 | } | |
88044202 BM |
473 | if (test_bit(WDM_RESETTING, &desc->flags)) { |
474 | rv = -EIO; | |
475 | goto err; | |
476 | } | |
17d80d56 | 477 | usb_mark_last_busy(interface_to_usbdev(desc->intf)); |
afba937e ON |
478 | if (rv < 0) { |
479 | rv = -ERESTARTSYS; | |
480 | goto err; | |
481 | } | |
482 | ||
483 | spin_lock_irq(&desc->iuspin); | |
484 | ||
485 | if (desc->rerr) { /* read completed, error happened */ | |
afba937e ON |
486 | desc->rerr = 0; |
487 | spin_unlock_irq(&desc->iuspin); | |
afba937e ON |
488 | rv = -EIO; |
489 | goto err; | |
490 | } | |
491 | /* | |
492 | * recheck whether we've lost the race | |
493 | * against the completion handler | |
494 | */ | |
495 | if (!test_bit(WDM_READ, &desc->flags)) { /* lost race */ | |
496 | spin_unlock_irq(&desc->iuspin); | |
497 | goto retry; | |
498 | } | |
c0f5ecee | 499 | |
afba937e | 500 | if (!desc->reslength) { /* zero length read */ |
b086b6b1 BM |
501 | dev_dbg(&desc->intf->dev, "%s: zero length - clearing WDM_READ\n", __func__); |
502 | clear_bit(WDM_READ, &desc->flags); | |
afba937e ON |
503 | spin_unlock_irq(&desc->iuspin); |
504 | goto retry; | |
505 | } | |
711c68b3 | 506 | cntr = desc->length; |
afba937e ON |
507 | spin_unlock_irq(&desc->iuspin); |
508 | } | |
509 | ||
711c68b3 BH |
510 | if (cntr > count) |
511 | cntr = count; | |
afba937e ON |
512 | rv = copy_to_user(buffer, desc->ubuf, cntr); |
513 | if (rv > 0) { | |
514 | rv = -EFAULT; | |
515 | goto err; | |
516 | } | |
517 | ||
711c68b3 BH |
518 | spin_lock_irq(&desc->iuspin); |
519 | ||
afba937e ON |
520 | for (i = 0; i < desc->length - cntr; i++) |
521 | desc->ubuf[i] = desc->ubuf[i + cntr]; | |
522 | ||
523 | desc->length -= cntr; | |
87d65e54 | 524 | /* in case we had outstanding data */ |
73e06865 | 525 | if (!desc->length) { |
87d65e54 | 526 | clear_bit(WDM_READ, &desc->flags); |
711c68b3 | 527 | |
73e06865 GS |
528 | if (--desc->resp_count) { |
529 | set_bit(WDM_RESPONDING, &desc->flags); | |
530 | spin_unlock_irq(&desc->iuspin); | |
531 | ||
532 | rv = usb_submit_urb(desc->response, GFP_KERNEL); | |
533 | if (rv) { | |
534 | dev_err(&desc->intf->dev, | |
535 | "%s: usb_submit_urb failed with result %d\n", | |
536 | __func__, rv); | |
537 | spin_lock_irq(&desc->iuspin); | |
538 | clear_bit(WDM_RESPONDING, &desc->flags); | |
539 | spin_unlock_irq(&desc->iuspin); | |
540 | ||
541 | if (rv == -ENOMEM) { | |
542 | rv = schedule_work(&desc->rxwork); | |
543 | if (rv) | |
544 | dev_err(&desc->intf->dev, "Cannot schedule work\n"); | |
545 | } else { | |
546 | spin_lock_irq(&desc->iuspin); | |
547 | desc->resp_count = 0; | |
548 | spin_unlock_irq(&desc->iuspin); | |
549 | } | |
550 | } | |
551 | } else | |
552 | spin_unlock_irq(&desc->iuspin); | |
553 | } else | |
554 | spin_unlock_irq(&desc->iuspin); | |
711c68b3 | 555 | |
afba937e ON |
556 | rv = cntr; |
557 | ||
558 | err: | |
e8537bd2 | 559 | mutex_unlock(&desc->rlock); |
afba937e ON |
560 | return rv; |
561 | } | |
562 | ||
563 | static int wdm_flush(struct file *file, fl_owner_t id) | |
564 | { | |
565 | struct wdm_device *desc = file->private_data; | |
566 | ||
567 | wait_event(desc->wait, !test_bit(WDM_IN_USE, &desc->flags)); | |
6b0b79d3 BM |
568 | |
569 | /* cannot dereference desc->intf if WDM_DISCONNECTING */ | |
570 | if (desc->werr < 0 && !test_bit(WDM_DISCONNECTING, &desc->flags)) | |
9908a32e GKH |
571 | dev_err(&desc->intf->dev, "Error in flush path: %d\n", |
572 | desc->werr); | |
afba937e | 573 | |
24a85bae | 574 | return usb_translate_errors(desc->werr); |
afba937e ON |
575 | } |
576 | ||
577 | static unsigned int wdm_poll(struct file *file, struct poll_table_struct *wait) | |
578 | { | |
579 | struct wdm_device *desc = file->private_data; | |
580 | unsigned long flags; | |
581 | unsigned int mask = 0; | |
582 | ||
583 | spin_lock_irqsave(&desc->iuspin, flags); | |
584 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
616b6937 | 585 | mask = POLLHUP | POLLERR; |
afba937e ON |
586 | spin_unlock_irqrestore(&desc->iuspin, flags); |
587 | goto desc_out; | |
588 | } | |
589 | if (test_bit(WDM_READ, &desc->flags)) | |
590 | mask = POLLIN | POLLRDNORM; | |
591 | if (desc->rerr || desc->werr) | |
592 | mask |= POLLERR; | |
593 | if (!test_bit(WDM_IN_USE, &desc->flags)) | |
594 | mask |= POLLOUT | POLLWRNORM; | |
595 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
596 | ||
597 | poll_wait(file, &desc->wait, wait); | |
598 | ||
599 | desc_out: | |
600 | return mask; | |
601 | } | |
602 | ||
603 | static int wdm_open(struct inode *inode, struct file *file) | |
604 | { | |
605 | int minor = iminor(inode); | |
606 | int rv = -ENODEV; | |
607 | struct usb_interface *intf; | |
608 | struct wdm_device *desc; | |
609 | ||
610 | mutex_lock(&wdm_mutex); | |
b0c13860 BM |
611 | desc = wdm_find_device_by_minor(minor); |
612 | if (!desc) | |
afba937e ON |
613 | goto out; |
614 | ||
b0c13860 | 615 | intf = desc->intf; |
afba937e ON |
616 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) |
617 | goto out; | |
afba937e ON |
618 | file->private_data = desc; |
619 | ||
17d80d56 | 620 | rv = usb_autopm_get_interface(desc->intf); |
afba937e | 621 | if (rv < 0) { |
9908a32e | 622 | dev_err(&desc->intf->dev, "Error autopm - %d\n", rv); |
afba937e ON |
623 | goto out; |
624 | } | |
afba937e | 625 | |
e8537bd2 BM |
626 | /* using write lock to protect desc->count */ |
627 | mutex_lock(&desc->wlock); | |
17d80d56 | 628 | if (!desc->count++) { |
d771d8aa ON |
629 | desc->werr = 0; |
630 | desc->rerr = 0; | |
17d80d56 ON |
631 | rv = usb_submit_urb(desc->validity, GFP_KERNEL); |
632 | if (rv < 0) { | |
633 | desc->count--; | |
9908a32e GKH |
634 | dev_err(&desc->intf->dev, |
635 | "Error submitting int urb - %d\n", rv); | |
12a98b2b | 636 | rv = usb_translate_errors(rv); |
17d80d56 ON |
637 | } |
638 | } else { | |
639 | rv = 0; | |
640 | } | |
e8537bd2 | 641 | mutex_unlock(&desc->wlock); |
3cc36157 BM |
642 | if (desc->count == 1) |
643 | desc->manage_power(intf, 1); | |
17d80d56 | 644 | usb_autopm_put_interface(desc->intf); |
afba937e ON |
645 | out: |
646 | mutex_unlock(&wdm_mutex); | |
647 | return rv; | |
648 | } | |
649 | ||
650 | static int wdm_release(struct inode *inode, struct file *file) | |
651 | { | |
652 | struct wdm_device *desc = file->private_data; | |
653 | ||
654 | mutex_lock(&wdm_mutex); | |
e8537bd2 BM |
655 | |
656 | /* using write lock to protect desc->count */ | |
657 | mutex_lock(&desc->wlock); | |
afba937e | 658 | desc->count--; |
e8537bd2 | 659 | mutex_unlock(&desc->wlock); |
17d80d56 | 660 | |
afba937e | 661 | if (!desc->count) { |
880bca3a | 662 | if (!test_bit(WDM_DISCONNECTING, &desc->flags)) { |
6b0b79d3 BM |
663 | dev_dbg(&desc->intf->dev, "wdm_release: cleanup"); |
664 | kill_urbs(desc); | |
73e06865 GS |
665 | spin_lock_irq(&desc->iuspin); |
666 | desc->resp_count = 0; | |
667 | spin_unlock_irq(&desc->iuspin); | |
3cc36157 | 668 | desc->manage_power(desc->intf, 0); |
880bca3a | 669 | } else { |
6b0b79d3 BM |
670 | /* must avoid dev_printk here as desc->intf is invalid */ |
671 | pr_debug(KBUILD_MODNAME " %s: device gone - cleaning up\n", __func__); | |
2f338c8a | 672 | cleanup(desc); |
880bca3a | 673 | } |
afba937e ON |
674 | } |
675 | mutex_unlock(&wdm_mutex); | |
676 | return 0; | |
677 | } | |
678 | ||
3edce1cf BM |
679 | static long wdm_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
680 | { | |
681 | struct wdm_device *desc = file->private_data; | |
682 | int rv = 0; | |
683 | ||
684 | switch (cmd) { | |
685 | case IOCTL_WDM_MAX_COMMAND: | |
686 | if (copy_to_user((void __user *)arg, &desc->wMaxCommand, sizeof(desc->wMaxCommand))) | |
687 | rv = -EFAULT; | |
688 | break; | |
689 | default: | |
690 | rv = -ENOTTY; | |
691 | } | |
692 | return rv; | |
693 | } | |
694 | ||
afba937e ON |
695 | static const struct file_operations wdm_fops = { |
696 | .owner = THIS_MODULE, | |
697 | .read = wdm_read, | |
698 | .write = wdm_write, | |
699 | .open = wdm_open, | |
700 | .flush = wdm_flush, | |
701 | .release = wdm_release, | |
6038f373 | 702 | .poll = wdm_poll, |
3edce1cf BM |
703 | .unlocked_ioctl = wdm_ioctl, |
704 | .compat_ioctl = wdm_ioctl, | |
6038f373 | 705 | .llseek = noop_llseek, |
afba937e ON |
706 | }; |
707 | ||
708 | static struct usb_class_driver wdm_class = { | |
709 | .name = "cdc-wdm%d", | |
710 | .fops = &wdm_fops, | |
711 | .minor_base = WDM_MINOR_BASE, | |
712 | }; | |
713 | ||
714 | /* --- error handling --- */ | |
715 | static void wdm_rxwork(struct work_struct *work) | |
716 | { | |
717 | struct wdm_device *desc = container_of(work, struct wdm_device, rxwork); | |
718 | unsigned long flags; | |
6dd433e6 ON |
719 | int rv = 0; |
720 | int responding; | |
afba937e ON |
721 | |
722 | spin_lock_irqsave(&desc->iuspin, flags); | |
723 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
724 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
725 | } else { | |
6dd433e6 | 726 | responding = test_and_set_bit(WDM_RESPONDING, &desc->flags); |
afba937e | 727 | spin_unlock_irqrestore(&desc->iuspin, flags); |
6dd433e6 ON |
728 | if (!responding) |
729 | rv = usb_submit_urb(desc->response, GFP_KERNEL); | |
afba937e ON |
730 | if (rv < 0 && rv != -EPERM) { |
731 | spin_lock_irqsave(&desc->iuspin, flags); | |
6dd433e6 | 732 | clear_bit(WDM_RESPONDING, &desc->flags); |
afba937e ON |
733 | if (!test_bit(WDM_DISCONNECTING, &desc->flags)) |
734 | schedule_work(&desc->rxwork); | |
735 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
736 | } | |
737 | } | |
738 | } | |
739 | ||
740 | /* --- hotplug --- */ | |
741 | ||
3cc36157 BM |
742 | static int wdm_create(struct usb_interface *intf, struct usb_endpoint_descriptor *ep, |
743 | u16 bufsize, int (*manage_power)(struct usb_interface *, int)) | |
afba937e | 744 | { |
0dffb486 | 745 | int rv = -ENOMEM; |
afba937e | 746 | struct wdm_device *desc; |
afba937e | 747 | |
afba937e ON |
748 | desc = kzalloc(sizeof(struct wdm_device), GFP_KERNEL); |
749 | if (!desc) | |
750 | goto out; | |
b0c13860 | 751 | INIT_LIST_HEAD(&desc->device_list); |
e8537bd2 BM |
752 | mutex_init(&desc->rlock); |
753 | mutex_init(&desc->wlock); | |
afba937e ON |
754 | spin_lock_init(&desc->iuspin); |
755 | init_waitqueue_head(&desc->wait); | |
0dffb486 | 756 | desc->wMaxCommand = bufsize; |
052fbc0d | 757 | /* this will be expanded and needed in hardware endianness */ |
afba937e ON |
758 | desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber); |
759 | desc->intf = intf; | |
760 | INIT_WORK(&desc->rxwork, wdm_rxwork); | |
761 | ||
052fbc0d | 762 | rv = -EINVAL; |
0dffb486 | 763 | if (!usb_endpoint_is_int_in(ep)) |
afba937e | 764 | goto err; |
afba937e | 765 | |
29cc8897 | 766 | desc->wMaxPacketSize = usb_endpoint_maxp(ep); |
afba937e ON |
767 | |
768 | desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); | |
769 | if (!desc->orq) | |
770 | goto err; | |
771 | desc->irq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); | |
772 | if (!desc->irq) | |
773 | goto err; | |
774 | ||
775 | desc->validity = usb_alloc_urb(0, GFP_KERNEL); | |
776 | if (!desc->validity) | |
777 | goto err; | |
778 | ||
779 | desc->response = usb_alloc_urb(0, GFP_KERNEL); | |
780 | if (!desc->response) | |
781 | goto err; | |
782 | ||
783 | desc->command = usb_alloc_urb(0, GFP_KERNEL); | |
784 | if (!desc->command) | |
785 | goto err; | |
786 | ||
787 | desc->ubuf = kmalloc(desc->wMaxCommand, GFP_KERNEL); | |
788 | if (!desc->ubuf) | |
789 | goto err; | |
790 | ||
8457d99c | 791 | desc->sbuf = kmalloc(desc->wMaxPacketSize, GFP_KERNEL); |
afba937e ON |
792 | if (!desc->sbuf) |
793 | goto err; | |
794 | ||
8457d99c | 795 | desc->inbuf = kmalloc(desc->wMaxCommand, GFP_KERNEL); |
afba937e | 796 | if (!desc->inbuf) |
8457d99c | 797 | goto err; |
afba937e ON |
798 | |
799 | usb_fill_int_urb( | |
800 | desc->validity, | |
801 | interface_to_usbdev(intf), | |
802 | usb_rcvintpipe(interface_to_usbdev(intf), ep->bEndpointAddress), | |
803 | desc->sbuf, | |
804 | desc->wMaxPacketSize, | |
805 | wdm_int_callback, | |
806 | desc, | |
807 | ep->bInterval | |
808 | ); | |
afba937e | 809 | |
19b85b3b BM |
810 | desc->irq->bRequestType = (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE); |
811 | desc->irq->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE; | |
812 | desc->irq->wValue = 0; | |
813 | desc->irq->wIndex = desc->inum; | |
814 | desc->irq->wLength = cpu_to_le16(desc->wMaxCommand); | |
815 | ||
816 | usb_fill_control_urb( | |
817 | desc->response, | |
8143a896 | 818 | interface_to_usbdev(intf), |
19b85b3b BM |
819 | /* using common endpoint 0 */ |
820 | usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0), | |
821 | (unsigned char *)desc->irq, | |
822 | desc->inbuf, | |
823 | desc->wMaxCommand, | |
824 | wdm_in_callback, | |
825 | desc | |
826 | ); | |
19b85b3b | 827 | |
3cc36157 BM |
828 | desc->manage_power = manage_power; |
829 | ||
b0c13860 BM |
830 | spin_lock(&wdm_device_list_lock); |
831 | list_add(&desc->device_list, &wdm_device_list); | |
832 | spin_unlock(&wdm_device_list_lock); | |
833 | ||
afba937e | 834 | rv = usb_register_dev(intf, &wdm_class); |
afba937e | 835 | if (rv < 0) |
b0c13860 | 836 | goto err; |
052fbc0d | 837 | else |
820c629a | 838 | dev_info(&intf->dev, "%s: USB WDM device\n", dev_name(intf->usb_dev)); |
afba937e ON |
839 | out: |
840 | return rv; | |
afba937e | 841 | err: |
6286d85e BM |
842 | spin_lock(&wdm_device_list_lock); |
843 | list_del(&desc->device_list); | |
844 | spin_unlock(&wdm_device_list_lock); | |
0dffb486 BM |
845 | cleanup(desc); |
846 | return rv; | |
847 | } | |
848 | ||
3cc36157 BM |
849 | static int wdm_manage_power(struct usb_interface *intf, int on) |
850 | { | |
851 | /* need autopm_get/put here to ensure the usbcore sees the new value */ | |
852 | int rv = usb_autopm_get_interface(intf); | |
853 | if (rv < 0) | |
854 | goto err; | |
855 | ||
856 | intf->needs_remote_wakeup = on; | |
857 | usb_autopm_put_interface(intf); | |
858 | err: | |
859 | return rv; | |
860 | } | |
861 | ||
0dffb486 BM |
862 | static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) |
863 | { | |
864 | int rv = -EINVAL; | |
865 | struct usb_host_interface *iface; | |
866 | struct usb_endpoint_descriptor *ep; | |
867 | struct usb_cdc_dmm_desc *dmhd; | |
868 | u8 *buffer = intf->altsetting->extra; | |
869 | int buflen = intf->altsetting->extralen; | |
870 | u16 maxcom = WDM_DEFAULT_BUFSIZE; | |
871 | ||
872 | if (!buffer) | |
873 | goto err; | |
874 | while (buflen > 2) { | |
875 | if (buffer[1] != USB_DT_CS_INTERFACE) { | |
876 | dev_err(&intf->dev, "skipping garbage\n"); | |
877 | goto next_desc; | |
878 | } | |
879 | ||
880 | switch (buffer[2]) { | |
881 | case USB_CDC_HEADER_TYPE: | |
882 | break; | |
883 | case USB_CDC_DMM_TYPE: | |
884 | dmhd = (struct usb_cdc_dmm_desc *)buffer; | |
885 | maxcom = le16_to_cpu(dmhd->wMaxCommand); | |
886 | dev_dbg(&intf->dev, | |
887 | "Finding maximum buffer length: %d", maxcom); | |
888 | break; | |
889 | default: | |
890 | dev_err(&intf->dev, | |
891 | "Ignoring extra header, type %d, length %d\n", | |
892 | buffer[2], buffer[0]); | |
893 | break; | |
894 | } | |
895 | next_desc: | |
896 | buflen -= buffer[0]; | |
897 | buffer += buffer[0]; | |
898 | } | |
899 | ||
900 | iface = intf->cur_altsetting; | |
901 | if (iface->desc.bNumEndpoints != 1) | |
902 | goto err; | |
903 | ep = &iface->endpoint[0].desc; | |
904 | ||
3cc36157 | 905 | rv = wdm_create(intf, ep, maxcom, &wdm_manage_power); |
0dffb486 BM |
906 | |
907 | err: | |
afba937e ON |
908 | return rv; |
909 | } | |
910 | ||
3cc36157 BM |
911 | /** |
912 | * usb_cdc_wdm_register - register a WDM subdriver | |
913 | * @intf: usb interface the subdriver will associate with | |
914 | * @ep: interrupt endpoint to monitor for notifications | |
915 | * @bufsize: maximum message size to support for read/write | |
916 | * | |
917 | * Create WDM usb class character device and associate it with intf | |
918 | * without binding, allowing another driver to manage the interface. | |
919 | * | |
920 | * The subdriver will manage the given interrupt endpoint exclusively | |
921 | * and will issue control requests referring to the given intf. It | |
922 | * will otherwise avoid interferring, and in particular not do | |
923 | * usb_set_intfdata/usb_get_intfdata on intf. | |
924 | * | |
925 | * The return value is a pointer to the subdriver's struct usb_driver. | |
926 | * The registering driver is responsible for calling this subdriver's | |
927 | * disconnect, suspend, resume, pre_reset and post_reset methods from | |
928 | * its own. | |
929 | */ | |
930 | struct usb_driver *usb_cdc_wdm_register(struct usb_interface *intf, | |
931 | struct usb_endpoint_descriptor *ep, | |
932 | int bufsize, | |
933 | int (*manage_power)(struct usb_interface *, int)) | |
934 | { | |
935 | int rv = -EINVAL; | |
936 | ||
937 | rv = wdm_create(intf, ep, bufsize, manage_power); | |
938 | if (rv < 0) | |
939 | goto err; | |
940 | ||
941 | return &wdm_driver; | |
942 | err: | |
943 | return ERR_PTR(rv); | |
944 | } | |
945 | EXPORT_SYMBOL(usb_cdc_wdm_register); | |
946 | ||
afba937e ON |
947 | static void wdm_disconnect(struct usb_interface *intf) |
948 | { | |
949 | struct wdm_device *desc; | |
950 | unsigned long flags; | |
951 | ||
952 | usb_deregister_dev(intf, &wdm_class); | |
b0c13860 | 953 | desc = wdm_find_device(intf); |
afba937e | 954 | mutex_lock(&wdm_mutex); |
afba937e ON |
955 | |
956 | /* the spinlock makes sure no new urbs are generated in the callbacks */ | |
957 | spin_lock_irqsave(&desc->iuspin, flags); | |
958 | set_bit(WDM_DISCONNECTING, &desc->flags); | |
959 | set_bit(WDM_READ, &desc->flags); | |
17d80d56 | 960 | /* to terminate pending flushes */ |
afba937e ON |
961 | clear_bit(WDM_IN_USE, &desc->flags); |
962 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
62aaf24d | 963 | wake_up_all(&desc->wait); |
e8537bd2 BM |
964 | mutex_lock(&desc->rlock); |
965 | mutex_lock(&desc->wlock); | |
afba937e | 966 | kill_urbs(desc); |
d93d16e9 | 967 | cancel_work_sync(&desc->rxwork); |
e8537bd2 BM |
968 | mutex_unlock(&desc->wlock); |
969 | mutex_unlock(&desc->rlock); | |
6286d85e BM |
970 | |
971 | /* the desc->intf pointer used as list key is now invalid */ | |
972 | spin_lock(&wdm_device_list_lock); | |
973 | list_del(&desc->device_list); | |
974 | spin_unlock(&wdm_device_list_lock); | |
975 | ||
afba937e ON |
976 | if (!desc->count) |
977 | cleanup(desc); | |
880bca3a BM |
978 | else |
979 | dev_dbg(&intf->dev, "%s: %d open files - postponing cleanup\n", __func__, desc->count); | |
afba937e ON |
980 | mutex_unlock(&wdm_mutex); |
981 | } | |
982 | ||
d93d16e9 | 983 | #ifdef CONFIG_PM |
17d80d56 ON |
984 | static int wdm_suspend(struct usb_interface *intf, pm_message_t message) |
985 | { | |
b0c13860 | 986 | struct wdm_device *desc = wdm_find_device(intf); |
17d80d56 ON |
987 | int rv = 0; |
988 | ||
989 | dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor); | |
990 | ||
d93d16e9 | 991 | /* if this is an autosuspend the caller does the locking */ |
e8537bd2 BM |
992 | if (!PMSG_IS_AUTO(message)) { |
993 | mutex_lock(&desc->rlock); | |
994 | mutex_lock(&desc->wlock); | |
995 | } | |
62e66854 | 996 | spin_lock_irq(&desc->iuspin); |
d93d16e9 | 997 | |
5b1b0b81 | 998 | if (PMSG_IS_AUTO(message) && |
922a5ead ON |
999 | (test_bit(WDM_IN_USE, &desc->flags) |
1000 | || test_bit(WDM_RESPONDING, &desc->flags))) { | |
62e66854 | 1001 | spin_unlock_irq(&desc->iuspin); |
17d80d56 ON |
1002 | rv = -EBUSY; |
1003 | } else { | |
d93d16e9 | 1004 | |
beb1d35f | 1005 | set_bit(WDM_SUSPENDING, &desc->flags); |
62e66854 | 1006 | spin_unlock_irq(&desc->iuspin); |
d93d16e9 | 1007 | /* callback submits work - order is essential */ |
17d80d56 | 1008 | kill_urbs(desc); |
d93d16e9 | 1009 | cancel_work_sync(&desc->rxwork); |
17d80d56 | 1010 | } |
e8537bd2 BM |
1011 | if (!PMSG_IS_AUTO(message)) { |
1012 | mutex_unlock(&desc->wlock); | |
1013 | mutex_unlock(&desc->rlock); | |
1014 | } | |
17d80d56 ON |
1015 | |
1016 | return rv; | |
1017 | } | |
d93d16e9 | 1018 | #endif |
17d80d56 ON |
1019 | |
1020 | static int recover_from_urb_loss(struct wdm_device *desc) | |
1021 | { | |
1022 | int rv = 0; | |
1023 | ||
1024 | if (desc->count) { | |
1025 | rv = usb_submit_urb(desc->validity, GFP_NOIO); | |
1026 | if (rv < 0) | |
9908a32e GKH |
1027 | dev_err(&desc->intf->dev, |
1028 | "Error resume submitting int urb - %d\n", rv); | |
17d80d56 ON |
1029 | } |
1030 | return rv; | |
1031 | } | |
d93d16e9 ON |
1032 | |
1033 | #ifdef CONFIG_PM | |
17d80d56 ON |
1034 | static int wdm_resume(struct usb_interface *intf) |
1035 | { | |
b0c13860 | 1036 | struct wdm_device *desc = wdm_find_device(intf); |
17d80d56 ON |
1037 | int rv; |
1038 | ||
1039 | dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor); | |
338124c1 | 1040 | |
beb1d35f | 1041 | clear_bit(WDM_SUSPENDING, &desc->flags); |
62e66854 | 1042 | rv = recover_from_urb_loss(desc); |
338124c1 | 1043 | |
17d80d56 ON |
1044 | return rv; |
1045 | } | |
d93d16e9 | 1046 | #endif |
17d80d56 ON |
1047 | |
1048 | static int wdm_pre_reset(struct usb_interface *intf) | |
1049 | { | |
b0c13860 | 1050 | struct wdm_device *desc = wdm_find_device(intf); |
17d80d56 | 1051 | |
d771d8aa ON |
1052 | /* |
1053 | * we notify everybody using poll of | |
1054 | * an exceptional situation | |
1055 | * must be done before recovery lest a spontaneous | |
1056 | * message from the device is lost | |
1057 | */ | |
1058 | spin_lock_irq(&desc->iuspin); | |
88044202 BM |
1059 | set_bit(WDM_RESETTING, &desc->flags); /* inform read/write */ |
1060 | set_bit(WDM_READ, &desc->flags); /* unblock read */ | |
1061 | clear_bit(WDM_IN_USE, &desc->flags); /* unblock write */ | |
d771d8aa ON |
1062 | desc->rerr = -EINTR; |
1063 | spin_unlock_irq(&desc->iuspin); | |
1064 | wake_up_all(&desc->wait); | |
88044202 BM |
1065 | mutex_lock(&desc->rlock); |
1066 | mutex_lock(&desc->wlock); | |
1067 | kill_urbs(desc); | |
1068 | cancel_work_sync(&desc->rxwork); | |
17d80d56 ON |
1069 | return 0; |
1070 | } | |
1071 | ||
1072 | static int wdm_post_reset(struct usb_interface *intf) | |
1073 | { | |
b0c13860 | 1074 | struct wdm_device *desc = wdm_find_device(intf); |
17d80d56 ON |
1075 | int rv; |
1076 | ||
c0f5ecee | 1077 | clear_bit(WDM_OVERFLOW, &desc->flags); |
88044202 | 1078 | clear_bit(WDM_RESETTING, &desc->flags); |
17d80d56 | 1079 | rv = recover_from_urb_loss(desc); |
e8537bd2 BM |
1080 | mutex_unlock(&desc->wlock); |
1081 | mutex_unlock(&desc->rlock); | |
17d80d56 ON |
1082 | return 0; |
1083 | } | |
1084 | ||
afba937e ON |
1085 | static struct usb_driver wdm_driver = { |
1086 | .name = "cdc_wdm", | |
1087 | .probe = wdm_probe, | |
1088 | .disconnect = wdm_disconnect, | |
d93d16e9 | 1089 | #ifdef CONFIG_PM |
17d80d56 ON |
1090 | .suspend = wdm_suspend, |
1091 | .resume = wdm_resume, | |
1092 | .reset_resume = wdm_resume, | |
d93d16e9 | 1093 | #endif |
17d80d56 ON |
1094 | .pre_reset = wdm_pre_reset, |
1095 | .post_reset = wdm_post_reset, | |
afba937e | 1096 | .id_table = wdm_ids, |
17d80d56 | 1097 | .supports_autosuspend = 1, |
e1f12eb6 | 1098 | .disable_hub_initiated_lpm = 1, |
afba937e ON |
1099 | }; |
1100 | ||
65db4305 | 1101 | module_usb_driver(wdm_driver); |
afba937e ON |
1102 | |
1103 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
87d65e54 | 1104 | MODULE_DESCRIPTION(DRIVER_DESC); |
afba937e | 1105 | MODULE_LICENSE("GPL"); |