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usbfs: simplify the lookup-by-minor routines
[linux-2.6/mini2440.git] / drivers / usb / class / cdc-wdm.c
blob1103ce7016b13e6cc28114b0ec5088ff2336584f
1 /*
2 * cdc-wdm.c
3 *
4 * This driver supports USB CDC WCM Device Management.
5 *
6 * Copyright (c) 2007-2008 Oliver Neukum
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>
16 #include <linux/slab.h>
17 #include <linux/module.h>
18 #include <linux/smp_lock.h>
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>
27
28 /*
29 * Version Information
30 */
31 #define DRIVER_VERSION "v0.03"
32 #define DRIVER_AUTHOR "Oliver Neukum"
33 #define DRIVER_DESC "USB Abstract Control Model driver for USB WCM Device Management"
34
35 static struct usb_device_id wdm_ids[] = {
36 {
37 .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS |
38 USB_DEVICE_ID_MATCH_INT_SUBCLASS,
39 .bInterfaceClass = USB_CLASS_COMM,
40 .bInterfaceSubClass = USB_CDC_SUBCLASS_DMM
41 },
42 { }
43 };
44
45 #define WDM_MINOR_BASE 176
46
47
48 #define WDM_IN_USE 1
49 #define WDM_DISCONNECTING 2
50 #define WDM_RESULT 3
51 #define WDM_READ 4
52 #define WDM_INT_STALL 5
53 #define WDM_POLL_RUNNING 6
54
55
56 #define WDM_MAX 16
57
58
59 static DEFINE_MUTEX(wdm_mutex);
60
61 /* --- method tables --- */
62
63 struct wdm_device {
64 u8 *inbuf; /* buffer for response */
65 u8 *outbuf; /* buffer for command */
66 u8 *sbuf; /* buffer for status */
67 u8 *ubuf; /* buffer for copy to user space */
68
69 struct urb *command;
70 struct urb *response;
71 struct urb *validity;
72 struct usb_interface *intf;
73 struct usb_ctrlrequest *orq;
74 struct usb_ctrlrequest *irq;
75 spinlock_t iuspin;
76
77 unsigned long flags;
78 u16 bufsize;
79 u16 wMaxCommand;
80 u16 wMaxPacketSize;
81 u16 bMaxPacketSize0;
82 __le16 inum;
83 int reslength;
84 int length;
85 int read;
86 int count;
87 dma_addr_t shandle;
88 dma_addr_t ihandle;
89 struct mutex wlock;
90 struct mutex rlock;
91 struct mutex plock;
92 wait_queue_head_t wait;
93 struct work_struct rxwork;
94 int werr;
95 int rerr;
96 };
97
98 static struct usb_driver wdm_driver;
99
100 /* --- callbacks --- */
101 static void wdm_out_callback(struct urb *urb)
102 {
103 struct wdm_device *desc;
104 desc = urb->context;
105 spin_lock(&desc->iuspin);
106 desc->werr = urb->status;
107 spin_unlock(&desc->iuspin);
108 clear_bit(WDM_IN_USE, &desc->flags);
109 kfree(desc->outbuf);
110 wake_up(&desc->wait);
111 }
112
113 static void wdm_in_callback(struct urb *urb)
114 {
115 struct wdm_device *desc = urb->context;
116 int status = urb->status;
117
118 spin_lock(&desc->iuspin);
119
120 if (status) {
121 switch (status) {
122 case -ENOENT:
123 dev_dbg(&desc->intf->dev,
124 "nonzero urb status received: -ENOENT");
125 break;
126 case -ECONNRESET:
127 dev_dbg(&desc->intf->dev,
128 "nonzero urb status received: -ECONNRESET");
129 break;
130 case -ESHUTDOWN:
131 dev_dbg(&desc->intf->dev,
132 "nonzero urb status received: -ESHUTDOWN");
133 break;
134 case -EPIPE:
135 err("nonzero urb status received: -EPIPE");
136 break;
137 default:
138 err("Unexpected error %d", status);
139 break;
140 }
141 }
142
143 desc->rerr = status;
144 desc->reslength = urb->actual_length;
145 memmove(desc->ubuf + desc->length, desc->inbuf, desc->reslength);
146 desc->length += desc->reslength;
147 wake_up(&desc->wait);
148
149 set_bit(WDM_READ, &desc->flags);
150 spin_unlock(&desc->iuspin);
151 }
152
153 static void wdm_int_callback(struct urb *urb)
154 {
155 int rv = 0;
156 int status = urb->status;
157 struct wdm_device *desc;
158 struct usb_ctrlrequest *req;
159 struct usb_cdc_notification *dr;
160
161 desc = urb->context;
162 req = desc->irq;
163 dr = (struct usb_cdc_notification *)desc->sbuf;
164
165 if (status) {
166 switch (status) {
167 case -ESHUTDOWN:
168 case -ENOENT:
169 case -ECONNRESET:
170 return; /* unplug */
171 case -EPIPE:
172 set_bit(WDM_INT_STALL, &desc->flags);
173 err("Stall on int endpoint");
174 goto sw; /* halt is cleared in work */
175 default:
176 err("nonzero urb status received: %d", status);
177 break;
178 }
179 }
180
181 if (urb->actual_length < sizeof(struct usb_cdc_notification)) {
182 err("wdm_int_callback - %d bytes", urb->actual_length);
183 goto exit;
184 }
185
186 switch (dr->bNotificationType) {
187 case USB_CDC_NOTIFY_RESPONSE_AVAILABLE:
188 dev_dbg(&desc->intf->dev,
189 "NOTIFY_RESPONSE_AVAILABLE received: index %d len %d",
190 dr->wIndex, dr->wLength);
191 break;
192
193 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
194
195 dev_dbg(&desc->intf->dev,
196 "NOTIFY_NETWORK_CONNECTION %s network",
197 dr->wValue ? "connected to" : "disconnected from");
198 goto exit;
199 default:
200 clear_bit(WDM_POLL_RUNNING, &desc->flags);
201 err("unknown notification %d received: index %d len %d",
202 dr->bNotificationType, dr->wIndex, dr->wLength);
203 goto exit;
204 }
205
206 req->bRequestType = (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE);
207 req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
208 req->wValue = 0;
209 req->wIndex = desc->inum;
210 req->wLength = cpu_to_le16(desc->wMaxCommand);
211
212 usb_fill_control_urb(
213 desc->response,
214 interface_to_usbdev(desc->intf),
215 /* using common endpoint 0 */
216 usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0),
217 (unsigned char *)req,
218 desc->inbuf,
219 desc->wMaxCommand,
220 wdm_in_callback,
221 desc
222 );
223 desc->response->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
224 spin_lock(&desc->iuspin);
225 clear_bit(WDM_READ, &desc->flags);
226 if (!test_bit(WDM_DISCONNECTING, &desc->flags)) {
227 rv = usb_submit_urb(desc->response, GFP_ATOMIC);
228 dev_dbg(&desc->intf->dev, "%s: usb_submit_urb %d",
229 __func__, rv);
230 }
231 spin_unlock(&desc->iuspin);
232 if (rv < 0) {
233 if (rv == -EPERM)
234 return;
235 if (rv == -ENOMEM) {
236 sw:
237 rv = schedule_work(&desc->rxwork);
238 if (rv)
239 err("Cannot schedule work");
240 }
241 }
242 exit:
243 rv = usb_submit_urb(urb, GFP_ATOMIC);
244 if (rv)
245 err("%s - usb_submit_urb failed with result %d",
246 __func__, rv);
247
248 }
249
250 static void kill_urbs(struct wdm_device *desc)
251 {
252 /* the order here is essential */
253 usb_kill_urb(desc->command);
254 usb_kill_urb(desc->validity);
255 usb_kill_urb(desc->response);
256 }
257
258 static void free_urbs(struct wdm_device *desc)
259 {
260 usb_free_urb(desc->validity);
261 usb_free_urb(desc->response);
262 usb_free_urb(desc->command);
263 }
264
265 static void cleanup(struct wdm_device *desc)
266 {
267 usb_buffer_free(interface_to_usbdev(desc->intf),
268 desc->wMaxPacketSize,
269 desc->sbuf,
270 desc->validity->transfer_dma);
271 usb_buffer_free(interface_to_usbdev(desc->intf),
272 desc->wMaxCommand,
273 desc->inbuf,
274 desc->response->transfer_dma);
275 kfree(desc->orq);
276 kfree(desc->irq);
277 kfree(desc->ubuf);
278 free_urbs(desc);
279 kfree(desc);
280 }
281
282 static ssize_t wdm_write
283 (struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
284 {
285 u8 *buf;
286 int rv = -EMSGSIZE, r, we;
287 struct wdm_device *desc = file->private_data;
288 struct usb_ctrlrequest *req;
289
290 if (count > desc->wMaxCommand)
291 count = desc->wMaxCommand;
292
293 spin_lock_irq(&desc->iuspin);
294 we = desc->werr;
295 desc->werr = 0;
296 spin_unlock_irq(&desc->iuspin);
297 if (we < 0)
298 return -EIO;
299
300 r = mutex_lock_interruptible(&desc->wlock); /* concurrent writes */
301 rv = -ERESTARTSYS;
302 if (r)
303 goto outnl;
304
305 r = usb_autopm_get_interface(desc->intf);
306 if (r < 0)
307 goto outnp;
308 r = wait_event_interruptible(desc->wait, !test_bit(WDM_IN_USE,
309 &desc->flags));
310 if (r < 0)
311 goto out;
312
313 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
314 rv = -ENODEV;
315 goto out;
316 }
317
318 desc->outbuf = buf = kmalloc(count, GFP_KERNEL);
319 if (!buf) {
320 rv = -ENOMEM;
321 goto out;
322 }
323
324 r = copy_from_user(buf, buffer, count);
325 if (r > 0) {
326 kfree(buf);
327 rv = -EFAULT;
328 goto out;
329 }
330
331 req = desc->orq;
332 usb_fill_control_urb(
333 desc->command,
334 interface_to_usbdev(desc->intf),
335 /* using common endpoint 0 */
336 usb_sndctrlpipe(interface_to_usbdev(desc->intf), 0),
337 (unsigned char *)req,
338 buf,
339 count,
340 wdm_out_callback,
341 desc
342 );
343
344 req->bRequestType = (USB_DIR_OUT | USB_TYPE_CLASS |
345 USB_RECIP_INTERFACE);
346 req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND;
347 req->wValue = 0;
348 req->wIndex = desc->inum;
349 req->wLength = cpu_to_le16(count);
350 set_bit(WDM_IN_USE, &desc->flags);
351
352 rv = usb_submit_urb(desc->command, GFP_KERNEL);
353 if (rv < 0) {
354 kfree(buf);
355 clear_bit(WDM_IN_USE, &desc->flags);
356 err("Tx URB error: %d", rv);
357 } else {
358 dev_dbg(&desc->intf->dev, "Tx URB has been submitted index=%d",
359 req->wIndex);
360 }
361 out:
362 usb_autopm_put_interface(desc->intf);
363 outnp:
364 mutex_unlock(&desc->wlock);
365 outnl:
366 return rv < 0 ? rv : count;
367 }
368
369 static ssize_t wdm_read
370 (struct file *file, char __user *buffer, size_t count, loff_t *ppos)
371 {
372 int rv, cntr;
373 int i = 0;
374 struct wdm_device *desc = file->private_data;
375
376
377 rv = mutex_lock_interruptible(&desc->rlock); /*concurrent reads */
378 if (rv < 0)
379 return -ERESTARTSYS;
380
381 if (desc->length == 0) {
382 desc->read = 0;
383 retry:
384 i++;
385 rv = wait_event_interruptible(desc->wait,
386 test_bit(WDM_READ, &desc->flags));
387
388 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
389 rv = -ENODEV;
390 goto err;
391 }
392 usb_mark_last_busy(interface_to_usbdev(desc->intf));
393 if (rv < 0) {
394 rv = -ERESTARTSYS;
395 goto err;
396 }
397
398 spin_lock_irq(&desc->iuspin);
399
400 if (desc->rerr) { /* read completed, error happened */
401 int t = desc->rerr;
402 desc->rerr = 0;
403 spin_unlock_irq(&desc->iuspin);
404 err("reading had resulted in %d", t);
405 rv = -EIO;
406 goto err;
407 }
408 /*
409 * recheck whether we've lost the race
410 * against the completion handler
411 */
412 if (!test_bit(WDM_READ, &desc->flags)) { /* lost race */
413 spin_unlock_irq(&desc->iuspin);
414 goto retry;
415 }
416 if (!desc->reslength) { /* zero length read */
417 spin_unlock_irq(&desc->iuspin);
418 goto retry;
419 }
420 clear_bit(WDM_READ, &desc->flags);
421 spin_unlock_irq(&desc->iuspin);
422 }
423
424 cntr = count > desc->length ? desc->length : count;
425 rv = copy_to_user(buffer, desc->ubuf, cntr);
426 if (rv > 0) {
427 rv = -EFAULT;
428 goto err;
429 }
430
431 for (i = 0; i < desc->length - cntr; i++)
432 desc->ubuf[i] = desc->ubuf[i + cntr];
433
434 desc->length -= cntr;
435 /* in case we had outstanding data */
436 if (!desc->length)
437 clear_bit(WDM_READ, &desc->flags);
438 rv = cntr;
439
440 err:
441 mutex_unlock(&desc->rlock);
442 if (rv < 0)
443 err("wdm_read: exit error");
444 return rv;
445 }
446
447 static int wdm_flush(struct file *file, fl_owner_t id)
448 {
449 struct wdm_device *desc = file->private_data;
450
451 wait_event(desc->wait, !test_bit(WDM_IN_USE, &desc->flags));
452 if (desc->werr < 0)
453 err("Error in flush path: %d", desc->werr);
454
455 return desc->werr;
456 }
457
458 static unsigned int wdm_poll(struct file *file, struct poll_table_struct *wait)
459 {
460 struct wdm_device *desc = file->private_data;
461 unsigned long flags;
462 unsigned int mask = 0;
463
464 spin_lock_irqsave(&desc->iuspin, flags);
465 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
466 mask = POLLERR;
467 spin_unlock_irqrestore(&desc->iuspin, flags);
468 goto desc_out;
469 }
470 if (test_bit(WDM_READ, &desc->flags))
471 mask = POLLIN | POLLRDNORM;
472 if (desc->rerr || desc->werr)
473 mask |= POLLERR;
474 if (!test_bit(WDM_IN_USE, &desc->flags))
475 mask |= POLLOUT | POLLWRNORM;
476 spin_unlock_irqrestore(&desc->iuspin, flags);
477
478 poll_wait(file, &desc->wait, wait);
479
480 desc_out:
481 return mask;
482 }
483
484 static int wdm_open(struct inode *inode, struct file *file)
485 {
486 int minor = iminor(inode);
487 int rv = -ENODEV;
488 struct usb_interface *intf;
489 struct wdm_device *desc;
490
491 mutex_lock(&wdm_mutex);
492 intf = usb_find_interface(&wdm_driver, minor);
493 if (!intf)
494 goto out;
495
496 desc = usb_get_intfdata(intf);
497 if (test_bit(WDM_DISCONNECTING, &desc->flags))
498 goto out;
499
500 ;
501 file->private_data = desc;
502
503 rv = usb_autopm_get_interface(desc->intf);
504 if (rv < 0) {
505 err("Error autopm - %d", rv);
506 goto out;
507 }
508 intf->needs_remote_wakeup = 1;
509
510 mutex_lock(&desc->plock);
511 if (!desc->count++) {
512 rv = usb_submit_urb(desc->validity, GFP_KERNEL);
513 if (rv < 0) {
514 desc->count--;
515 err("Error submitting int urb - %d", rv);
516 }
517 } else {
518 rv = 0;
519 }
520 mutex_unlock(&desc->plock);
521 usb_autopm_put_interface(desc->intf);
522 out:
523 mutex_unlock(&wdm_mutex);
524 return rv;
525 }
526
527 static int wdm_release(struct inode *inode, struct file *file)
528 {
529 struct wdm_device *desc = file->private_data;
530
531 mutex_lock(&wdm_mutex);
532 mutex_lock(&desc->plock);
533 desc->count--;
534 mutex_unlock(&desc->plock);
535
536 if (!desc->count) {
537 dev_dbg(&desc->intf->dev, "wdm_release: cleanup");
538 kill_urbs(desc);
539 if (!test_bit(WDM_DISCONNECTING, &desc->flags))
540 desc->intf->needs_remote_wakeup = 0;
541 }
542 mutex_unlock(&wdm_mutex);
543 return 0;
544 }
545
546 static const struct file_operations wdm_fops = {
547 .owner = THIS_MODULE,
548 .read = wdm_read,
549 .write = wdm_write,
550 .open = wdm_open,
551 .flush = wdm_flush,
552 .release = wdm_release,
553 .poll = wdm_poll
554 };
555
556 static struct usb_class_driver wdm_class = {
557 .name = "cdc-wdm%d",
558 .fops = &wdm_fops,
559 .minor_base = WDM_MINOR_BASE,
560 };
561
562 /* --- error handling --- */
563 static void wdm_rxwork(struct work_struct *work)
564 {
565 struct wdm_device *desc = container_of(work, struct wdm_device, rxwork);
566 unsigned long flags;
567 int rv;
568
569 spin_lock_irqsave(&desc->iuspin, flags);
570 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
571 spin_unlock_irqrestore(&desc->iuspin, flags);
572 } else {
573 spin_unlock_irqrestore(&desc->iuspin, flags);
574 rv = usb_submit_urb(desc->response, GFP_KERNEL);
575 if (rv < 0 && rv != -EPERM) {
576 spin_lock_irqsave(&desc->iuspin, flags);
577 if (!test_bit(WDM_DISCONNECTING, &desc->flags))
578 schedule_work(&desc->rxwork);
579 spin_unlock_irqrestore(&desc->iuspin, flags);
580 }
581 }
582 }
583
584 /* --- hotplug --- */
585
586 static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id)
587 {
588 int rv = -EINVAL;
589 struct usb_device *udev = interface_to_usbdev(intf);
590 struct wdm_device *desc;
591 struct usb_host_interface *iface;
592 struct usb_endpoint_descriptor *ep;
593 struct usb_cdc_dmm_desc *dmhd;
594 u8 *buffer = intf->altsetting->extra;
595 int buflen = intf->altsetting->extralen;
596 u16 maxcom = 0;
597
598 if (!buffer)
599 goto out;
600
601 while (buflen > 0) {
602 if (buffer [1] != USB_DT_CS_INTERFACE) {
603 err("skipping garbage");
604 goto next_desc;
605 }
606
607 switch (buffer [2]) {
608 case USB_CDC_HEADER_TYPE:
609 break;
610 case USB_CDC_DMM_TYPE:
611 dmhd = (struct usb_cdc_dmm_desc *)buffer;
612 maxcom = le16_to_cpu(dmhd->wMaxCommand);
613 dev_dbg(&intf->dev,
614 "Finding maximum buffer length: %d", maxcom);
615 break;
616 default:
617 err("Ignoring extra header, type %d, length %d",
618 buffer[2], buffer[0]);
619 break;
620 }
621 next_desc:
622 buflen -= buffer[0];
623 buffer += buffer[0];
624 }
625
626 rv = -ENOMEM;
627 desc = kzalloc(sizeof(struct wdm_device), GFP_KERNEL);
628 if (!desc)
629 goto out;
630 mutex_init(&desc->wlock);
631 mutex_init(&desc->rlock);
632 mutex_init(&desc->plock);
633 spin_lock_init(&desc->iuspin);
634 init_waitqueue_head(&desc->wait);
635 desc->wMaxCommand = maxcom;
636 desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber);
637 desc->intf = intf;
638 INIT_WORK(&desc->rxwork, wdm_rxwork);
639
640 iface = &intf->altsetting[0];
641 ep = &iface->endpoint[0].desc;
642 if (!usb_endpoint_is_int_in(ep)) {
643 rv = -EINVAL;
644 goto err;
645 }
646
647 desc->wMaxPacketSize = le16_to_cpu(ep->wMaxPacketSize);
648 desc->bMaxPacketSize0 = udev->descriptor.bMaxPacketSize0;
649
650 desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
651 if (!desc->orq)
652 goto err;
653 desc->irq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
654 if (!desc->irq)
655 goto err;
656
657 desc->validity = usb_alloc_urb(0, GFP_KERNEL);
658 if (!desc->validity)
659 goto err;
660
661 desc->response = usb_alloc_urb(0, GFP_KERNEL);
662 if (!desc->response)
663 goto err;
664
665 desc->command = usb_alloc_urb(0, GFP_KERNEL);
666 if (!desc->command)
667 goto err;
668
669 desc->ubuf = kmalloc(desc->wMaxCommand, GFP_KERNEL);
670 if (!desc->ubuf)
671 goto err;
672
673 desc->sbuf = usb_buffer_alloc(interface_to_usbdev(intf),
674 desc->wMaxPacketSize,
675 GFP_KERNEL,
676 &desc->validity->transfer_dma);
677 if (!desc->sbuf)
678 goto err;
679
680 desc->inbuf = usb_buffer_alloc(interface_to_usbdev(intf),
681 desc->bMaxPacketSize0,
682 GFP_KERNEL,
683 &desc->response->transfer_dma);
684 if (!desc->inbuf)
685 goto err2;
686
687 usb_fill_int_urb(
688 desc->validity,
689 interface_to_usbdev(intf),
690 usb_rcvintpipe(interface_to_usbdev(intf), ep->bEndpointAddress),
691 desc->sbuf,
692 desc->wMaxPacketSize,
693 wdm_int_callback,
694 desc,
695 ep->bInterval
696 );
697 desc->validity->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
698
699 usb_set_intfdata(intf, desc);
700 rv = usb_register_dev(intf, &wdm_class);
701 dev_info(&intf->dev, "cdc-wdm%d: USB WDM device\n",
702 intf->minor - WDM_MINOR_BASE);
703 if (rv < 0)
704 goto err;
705 out:
706 return rv;
707 err2:
708 usb_buffer_free(interface_to_usbdev(desc->intf),
709 desc->wMaxPacketSize,
710 desc->sbuf,
711 desc->validity->transfer_dma);
712 err:
713 free_urbs(desc);
714 kfree(desc->ubuf);
715 kfree(desc->orq);
716 kfree(desc->irq);
717 kfree(desc);
718 return rv;
719 }
720
721 static void wdm_disconnect(struct usb_interface *intf)
722 {
723 struct wdm_device *desc;
724 unsigned long flags;
725
726 usb_deregister_dev(intf, &wdm_class);
727 mutex_lock(&wdm_mutex);
728 desc = usb_get_intfdata(intf);
729
730 /* the spinlock makes sure no new urbs are generated in the callbacks */
731 spin_lock_irqsave(&desc->iuspin, flags);
732 set_bit(WDM_DISCONNECTING, &desc->flags);
733 set_bit(WDM_READ, &desc->flags);
734 /* to terminate pending flushes */
735 clear_bit(WDM_IN_USE, &desc->flags);
736 spin_unlock_irqrestore(&desc->iuspin, flags);
737 cancel_work_sync(&desc->rxwork);
738 kill_urbs(desc);
739 wake_up_all(&desc->wait);
740 if (!desc->count)
741 cleanup(desc);
742 mutex_unlock(&wdm_mutex);
743 }
744
745 static int wdm_suspend(struct usb_interface *intf, pm_message_t message)
746 {
747 struct wdm_device *desc = usb_get_intfdata(intf);
748 int rv = 0;
749
750 dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor);
751
752 mutex_lock(&desc->plock);
753 if (interface_to_usbdev(desc->intf)->auto_pm && test_bit(WDM_IN_USE, &desc->flags)) {
754 rv = -EBUSY;
755 } else {
756 cancel_work_sync(&desc->rxwork);
757 kill_urbs(desc);
758 }
759 mutex_unlock(&desc->plock);
760
761 return rv;
762 }
763
764 static int recover_from_urb_loss(struct wdm_device *desc)
765 {
766 int rv = 0;
767
768 if (desc->count) {
769 rv = usb_submit_urb(desc->validity, GFP_NOIO);
770 if (rv < 0)
771 err("Error resume submitting int urb - %d", rv);
772 }
773 return rv;
774 }
775 static int wdm_resume(struct usb_interface *intf)
776 {
777 struct wdm_device *desc = usb_get_intfdata(intf);
778 int rv;
779
780 dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor);
781 mutex_lock(&desc->plock);
782 rv = recover_from_urb_loss(desc);
783 mutex_unlock(&desc->plock);
784 return rv;
785 }
786
787 static int wdm_pre_reset(struct usb_interface *intf)
788 {
789 struct wdm_device *desc = usb_get_intfdata(intf);
790
791 mutex_lock(&desc->plock);
792 return 0;
793 }
794
795 static int wdm_post_reset(struct usb_interface *intf)
796 {
797 struct wdm_device *desc = usb_get_intfdata(intf);
798 int rv;
799
800 rv = recover_from_urb_loss(desc);
801 mutex_unlock(&desc->plock);
802 return 0;
803 }
804
805 static struct usb_driver wdm_driver = {
806 .name = "cdc_wdm",
807 .probe = wdm_probe,
808 .disconnect = wdm_disconnect,
809 .suspend = wdm_suspend,
810 .resume = wdm_resume,
811 .reset_resume = wdm_resume,
812 .pre_reset = wdm_pre_reset,
813 .post_reset = wdm_post_reset,
814 .id_table = wdm_ids,
815 .supports_autosuspend = 1,
816 };
817
818 /* --- low level module stuff --- */
819
820 static int __init wdm_init(void)
821 {
822 int rv;
823
824 rv = usb_register(&wdm_driver);
825
826 return rv;
827 }
828
829 static void __exit wdm_exit(void)
830 {
831 usb_deregister(&wdm_driver);
832 }
833
834 module_init(wdm_init);
835 module_exit(wdm_exit);
836
837 MODULE_AUTHOR(DRIVER_AUTHOR);
838 MODULE_DESCRIPTION(DRIVER_DESC);
839 MODULE_LICENSE("GPL");
Support for the Chinese Samsung S3C2440 based development boards