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USB: remove err() macro from usb class drivers
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / usb / class / cdc-wdm.c
blob7429f70b9d0643295a3ff86a5584bfe6614d9e29
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 dev_err(&desc->intf->dev,
136 "nonzero urb status received: -EPIPE\n");
137 break;
138 default:
139 dev_err(&desc->intf->dev,
140 "Unexpected error %d\n", status);
141 break;
142 }
143 }
144
145 desc->rerr = status;
146 desc->reslength = urb->actual_length;
147 memmove(desc->ubuf + desc->length, desc->inbuf, desc->reslength);
148 desc->length += desc->reslength;
149 wake_up(&desc->wait);
150
151 set_bit(WDM_READ, &desc->flags);
152 spin_unlock(&desc->iuspin);
153 }
154
155 static void wdm_int_callback(struct urb *urb)
156 {
157 int rv = 0;
158 int status = urb->status;
159 struct wdm_device *desc;
160 struct usb_ctrlrequest *req;
161 struct usb_cdc_notification *dr;
162
163 desc = urb->context;
164 req = desc->irq;
165 dr = (struct usb_cdc_notification *)desc->sbuf;
166
167 if (status) {
168 switch (status) {
169 case -ESHUTDOWN:
170 case -ENOENT:
171 case -ECONNRESET:
172 return; /* unplug */
173 case -EPIPE:
174 set_bit(WDM_INT_STALL, &desc->flags);
175 dev_err(&desc->intf->dev, "Stall on int endpoint\n");
176 goto sw; /* halt is cleared in work */
177 default:
178 dev_err(&desc->intf->dev,
179 "nonzero urb status received: %d\n", status);
180 break;
181 }
182 }
183
184 if (urb->actual_length < sizeof(struct usb_cdc_notification)) {
185 dev_err(&desc->intf->dev, "wdm_int_callback - %d bytes\n",
186 urb->actual_length);
187 goto exit;
188 }
189
190 switch (dr->bNotificationType) {
191 case USB_CDC_NOTIFY_RESPONSE_AVAILABLE:
192 dev_dbg(&desc->intf->dev,
193 "NOTIFY_RESPONSE_AVAILABLE received: index %d len %d",
194 dr->wIndex, dr->wLength);
195 break;
196
197 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
198
199 dev_dbg(&desc->intf->dev,
200 "NOTIFY_NETWORK_CONNECTION %s network",
201 dr->wValue ? "connected to" : "disconnected from");
202 goto exit;
203 default:
204 clear_bit(WDM_POLL_RUNNING, &desc->flags);
205 dev_err(&desc->intf->dev,
206 "unknown notification %d received: index %d len %d\n",
207 dr->bNotificationType, dr->wIndex, dr->wLength);
208 goto exit;
209 }
210
211 req->bRequestType = (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE);
212 req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
213 req->wValue = 0;
214 req->wIndex = desc->inum;
215 req->wLength = cpu_to_le16(desc->wMaxCommand);
216
217 usb_fill_control_urb(
218 desc->response,
219 interface_to_usbdev(desc->intf),
220 /* using common endpoint 0 */
221 usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0),
222 (unsigned char *)req,
223 desc->inbuf,
224 desc->wMaxCommand,
225 wdm_in_callback,
226 desc
227 );
228 desc->response->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
229 spin_lock(&desc->iuspin);
230 clear_bit(WDM_READ, &desc->flags);
231 if (!test_bit(WDM_DISCONNECTING, &desc->flags)) {
232 rv = usb_submit_urb(desc->response, GFP_ATOMIC);
233 dev_dbg(&desc->intf->dev, "%s: usb_submit_urb %d",
234 __func__, rv);
235 }
236 spin_unlock(&desc->iuspin);
237 if (rv < 0) {
238 if (rv == -EPERM)
239 return;
240 if (rv == -ENOMEM) {
241 sw:
242 rv = schedule_work(&desc->rxwork);
243 if (rv)
244 dev_err(&desc->intf->dev,
245 "Cannot schedule work\n");
246 }
247 }
248 exit:
249 rv = usb_submit_urb(urb, GFP_ATOMIC);
250 if (rv)
251 dev_err(&desc->intf->dev,
252 "%s - usb_submit_urb failed with result %d\n",
253 __func__, rv);
254
255 }
256
257 static void kill_urbs(struct wdm_device *desc)
258 {
259 /* the order here is essential */
260 usb_kill_urb(desc->command);
261 usb_kill_urb(desc->validity);
262 usb_kill_urb(desc->response);
263 }
264
265 static void free_urbs(struct wdm_device *desc)
266 {
267 usb_free_urb(desc->validity);
268 usb_free_urb(desc->response);
269 usb_free_urb(desc->command);
270 }
271
272 static void cleanup(struct wdm_device *desc)
273 {
274 usb_buffer_free(interface_to_usbdev(desc->intf),
275 desc->wMaxPacketSize,
276 desc->sbuf,
277 desc->validity->transfer_dma);
278 usb_buffer_free(interface_to_usbdev(desc->intf),
279 desc->wMaxCommand,
280 desc->inbuf,
281 desc->response->transfer_dma);
282 kfree(desc->orq);
283 kfree(desc->irq);
284 kfree(desc->ubuf);
285 free_urbs(desc);
286 kfree(desc);
287 }
288
289 static ssize_t wdm_write
290 (struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
291 {
292 u8 *buf;
293 int rv = -EMSGSIZE, r, we;
294 struct wdm_device *desc = file->private_data;
295 struct usb_ctrlrequest *req;
296
297 if (count > desc->wMaxCommand)
298 count = desc->wMaxCommand;
299
300 spin_lock_irq(&desc->iuspin);
301 we = desc->werr;
302 desc->werr = 0;
303 spin_unlock_irq(&desc->iuspin);
304 if (we < 0)
305 return -EIO;
306
307 r = mutex_lock_interruptible(&desc->wlock); /* concurrent writes */
308 rv = -ERESTARTSYS;
309 if (r)
310 goto outnl;
311
312 r = usb_autopm_get_interface(desc->intf);
313 if (r < 0)
314 goto outnp;
315 r = wait_event_interruptible(desc->wait, !test_bit(WDM_IN_USE,
316 &desc->flags));
317 if (r < 0)
318 goto out;
319
320 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
321 rv = -ENODEV;
322 goto out;
323 }
324
325 desc->outbuf = buf = kmalloc(count, GFP_KERNEL);
326 if (!buf) {
327 rv = -ENOMEM;
328 goto out;
329 }
330
331 r = copy_from_user(buf, buffer, count);
332 if (r > 0) {
333 kfree(buf);
334 rv = -EFAULT;
335 goto out;
336 }
337
338 req = desc->orq;
339 usb_fill_control_urb(
340 desc->command,
341 interface_to_usbdev(desc->intf),
342 /* using common endpoint 0 */
343 usb_sndctrlpipe(interface_to_usbdev(desc->intf), 0),
344 (unsigned char *)req,
345 buf,
346 count,
347 wdm_out_callback,
348 desc
349 );
350
351 req->bRequestType = (USB_DIR_OUT | USB_TYPE_CLASS |
352 USB_RECIP_INTERFACE);
353 req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND;
354 req->wValue = 0;
355 req->wIndex = desc->inum;
356 req->wLength = cpu_to_le16(count);
357 set_bit(WDM_IN_USE, &desc->flags);
358
359 rv = usb_submit_urb(desc->command, GFP_KERNEL);
360 if (rv < 0) {
361 kfree(buf);
362 clear_bit(WDM_IN_USE, &desc->flags);
363 dev_err(&desc->intf->dev, "Tx URB error: %d\n", rv);
364 } else {
365 dev_dbg(&desc->intf->dev, "Tx URB has been submitted index=%d",
366 req->wIndex);
367 }
368 out:
369 usb_autopm_put_interface(desc->intf);
370 outnp:
371 mutex_unlock(&desc->wlock);
372 outnl:
373 return rv < 0 ? rv : count;
374 }
375
376 static ssize_t wdm_read
377 (struct file *file, char __user *buffer, size_t count, loff_t *ppos)
378 {
379 int rv, cntr;
380 int i = 0;
381 struct wdm_device *desc = file->private_data;
382
383
384 rv = mutex_lock_interruptible(&desc->rlock); /*concurrent reads */
385 if (rv < 0)
386 return -ERESTARTSYS;
387
388 if (desc->length == 0) {
389 desc->read = 0;
390 retry:
391 i++;
392 rv = wait_event_interruptible(desc->wait,
393 test_bit(WDM_READ, &desc->flags));
394
395 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
396 rv = -ENODEV;
397 goto err;
398 }
399 usb_mark_last_busy(interface_to_usbdev(desc->intf));
400 if (rv < 0) {
401 rv = -ERESTARTSYS;
402 goto err;
403 }
404
405 spin_lock_irq(&desc->iuspin);
406
407 if (desc->rerr) { /* read completed, error happened */
408 int t = desc->rerr;
409 desc->rerr = 0;
410 spin_unlock_irq(&desc->iuspin);
411 dev_err(&desc->intf->dev,
412 "reading had resulted in %d\n", t);
413 rv = -EIO;
414 goto err;
415 }
416 /*
417 * recheck whether we've lost the race
418 * against the completion handler
419 */
420 if (!test_bit(WDM_READ, &desc->flags)) { /* lost race */
421 spin_unlock_irq(&desc->iuspin);
422 goto retry;
423 }
424 if (!desc->reslength) { /* zero length read */
425 spin_unlock_irq(&desc->iuspin);
426 goto retry;
427 }
428 clear_bit(WDM_READ, &desc->flags);
429 spin_unlock_irq(&desc->iuspin);
430 }
431
432 cntr = count > desc->length ? desc->length : count;
433 rv = copy_to_user(buffer, desc->ubuf, cntr);
434 if (rv > 0) {
435 rv = -EFAULT;
436 goto err;
437 }
438
439 for (i = 0; i < desc->length - cntr; i++)
440 desc->ubuf[i] = desc->ubuf[i + cntr];
441
442 desc->length -= cntr;
443 /* in case we had outstanding data */
444 if (!desc->length)
445 clear_bit(WDM_READ, &desc->flags);
446 rv = cntr;
447
448 err:
449 mutex_unlock(&desc->rlock);
450 if (rv < 0)
451 dev_err(&desc->intf->dev, "wdm_read: exit error\n");
452 return rv;
453 }
454
455 static int wdm_flush(struct file *file, fl_owner_t id)
456 {
457 struct wdm_device *desc = file->private_data;
458
459 wait_event(desc->wait, !test_bit(WDM_IN_USE, &desc->flags));
460 if (desc->werr < 0)
461 dev_err(&desc->intf->dev, "Error in flush path: %d\n",
462 desc->werr);
463
464 return desc->werr;
465 }
466
467 static unsigned int wdm_poll(struct file *file, struct poll_table_struct *wait)
468 {
469 struct wdm_device *desc = file->private_data;
470 unsigned long flags;
471 unsigned int mask = 0;
472
473 spin_lock_irqsave(&desc->iuspin, flags);
474 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
475 mask = POLLERR;
476 spin_unlock_irqrestore(&desc->iuspin, flags);
477 goto desc_out;
478 }
479 if (test_bit(WDM_READ, &desc->flags))
480 mask = POLLIN | POLLRDNORM;
481 if (desc->rerr || desc->werr)
482 mask |= POLLERR;
483 if (!test_bit(WDM_IN_USE, &desc->flags))
484 mask |= POLLOUT | POLLWRNORM;
485 spin_unlock_irqrestore(&desc->iuspin, flags);
486
487 poll_wait(file, &desc->wait, wait);
488
489 desc_out:
490 return mask;
491 }
492
493 static int wdm_open(struct inode *inode, struct file *file)
494 {
495 int minor = iminor(inode);
496 int rv = -ENODEV;
497 struct usb_interface *intf;
498 struct wdm_device *desc;
499
500 mutex_lock(&wdm_mutex);
501 intf = usb_find_interface(&wdm_driver, minor);
502 if (!intf)
503 goto out;
504
505 desc = usb_get_intfdata(intf);
506 if (test_bit(WDM_DISCONNECTING, &desc->flags))
507 goto out;
508
509 ;
510 file->private_data = desc;
511
512 rv = usb_autopm_get_interface(desc->intf);
513 if (rv < 0) {
514 dev_err(&desc->intf->dev, "Error autopm - %d\n", rv);
515 goto out;
516 }
517 intf->needs_remote_wakeup = 1;
518
519 mutex_lock(&desc->plock);
520 if (!desc->count++) {
521 rv = usb_submit_urb(desc->validity, GFP_KERNEL);
522 if (rv < 0) {
523 desc->count--;
524 dev_err(&desc->intf->dev,
525 "Error submitting int urb - %d\n", rv);
526 }
527 } else {
528 rv = 0;
529 }
530 mutex_unlock(&desc->plock);
531 usb_autopm_put_interface(desc->intf);
532 out:
533 mutex_unlock(&wdm_mutex);
534 return rv;
535 }
536
537 static int wdm_release(struct inode *inode, struct file *file)
538 {
539 struct wdm_device *desc = file->private_data;
540
541 mutex_lock(&wdm_mutex);
542 mutex_lock(&desc->plock);
543 desc->count--;
544 mutex_unlock(&desc->plock);
545
546 if (!desc->count) {
547 dev_dbg(&desc->intf->dev, "wdm_release: cleanup");
548 kill_urbs(desc);
549 if (!test_bit(WDM_DISCONNECTING, &desc->flags))
550 desc->intf->needs_remote_wakeup = 0;
551 }
552 mutex_unlock(&wdm_mutex);
553 return 0;
554 }
555
556 static const struct file_operations wdm_fops = {
557 .owner = THIS_MODULE,
558 .read = wdm_read,
559 .write = wdm_write,
560 .open = wdm_open,
561 .flush = wdm_flush,
562 .release = wdm_release,
563 .poll = wdm_poll
564 };
565
566 static struct usb_class_driver wdm_class = {
567 .name = "cdc-wdm%d",
568 .fops = &wdm_fops,
569 .minor_base = WDM_MINOR_BASE,
570 };
571
572 /* --- error handling --- */
573 static void wdm_rxwork(struct work_struct *work)
574 {
575 struct wdm_device *desc = container_of(work, struct wdm_device, rxwork);
576 unsigned long flags;
577 int rv;
578
579 spin_lock_irqsave(&desc->iuspin, flags);
580 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
581 spin_unlock_irqrestore(&desc->iuspin, flags);
582 } else {
583 spin_unlock_irqrestore(&desc->iuspin, flags);
584 rv = usb_submit_urb(desc->response, GFP_KERNEL);
585 if (rv < 0 && rv != -EPERM) {
586 spin_lock_irqsave(&desc->iuspin, flags);
587 if (!test_bit(WDM_DISCONNECTING, &desc->flags))
588 schedule_work(&desc->rxwork);
589 spin_unlock_irqrestore(&desc->iuspin, flags);
590 }
591 }
592 }
593
594 /* --- hotplug --- */
595
596 static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id)
597 {
598 int rv = -EINVAL;
599 struct usb_device *udev = interface_to_usbdev(intf);
600 struct wdm_device *desc;
601 struct usb_host_interface *iface;
602 struct usb_endpoint_descriptor *ep;
603 struct usb_cdc_dmm_desc *dmhd;
604 u8 *buffer = intf->altsetting->extra;
605 int buflen = intf->altsetting->extralen;
606 u16 maxcom = 0;
607
608 if (!buffer)
609 goto out;
610
611 while (buflen > 0) {
612 if (buffer [1] != USB_DT_CS_INTERFACE) {
613 dev_err(&intf->dev, "skipping garbage\n");
614 goto next_desc;
615 }
616
617 switch (buffer [2]) {
618 case USB_CDC_HEADER_TYPE:
619 break;
620 case USB_CDC_DMM_TYPE:
621 dmhd = (struct usb_cdc_dmm_desc *)buffer;
622 maxcom = le16_to_cpu(dmhd->wMaxCommand);
623 dev_dbg(&intf->dev,
624 "Finding maximum buffer length: %d", maxcom);
625 break;
626 default:
627 dev_err(&intf->dev,
628 "Ignoring extra header, type %d, length %d\n",
629 buffer[2], buffer[0]);
630 break;
631 }
632 next_desc:
633 buflen -= buffer[0];
634 buffer += buffer[0];
635 }
636
637 rv = -ENOMEM;
638 desc = kzalloc(sizeof(struct wdm_device), GFP_KERNEL);
639 if (!desc)
640 goto out;
641 mutex_init(&desc->wlock);
642 mutex_init(&desc->rlock);
643 mutex_init(&desc->plock);
644 spin_lock_init(&desc->iuspin);
645 init_waitqueue_head(&desc->wait);
646 desc->wMaxCommand = maxcom;
647 desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber);
648 desc->intf = intf;
649 INIT_WORK(&desc->rxwork, wdm_rxwork);
650
651 iface = &intf->altsetting[0];
652 ep = &iface->endpoint[0].desc;
653 if (!usb_endpoint_is_int_in(ep)) {
654 rv = -EINVAL;
655 goto err;
656 }
657
658 desc->wMaxPacketSize = le16_to_cpu(ep->wMaxPacketSize);
659 desc->bMaxPacketSize0 = udev->descriptor.bMaxPacketSize0;
660
661 desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
662 if (!desc->orq)
663 goto err;
664 desc->irq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
665 if (!desc->irq)
666 goto err;
667
668 desc->validity = usb_alloc_urb(0, GFP_KERNEL);
669 if (!desc->validity)
670 goto err;
671
672 desc->response = usb_alloc_urb(0, GFP_KERNEL);
673 if (!desc->response)
674 goto err;
675
676 desc->command = usb_alloc_urb(0, GFP_KERNEL);
677 if (!desc->command)
678 goto err;
679
680 desc->ubuf = kmalloc(desc->wMaxCommand, GFP_KERNEL);
681 if (!desc->ubuf)
682 goto err;
683
684 desc->sbuf = usb_buffer_alloc(interface_to_usbdev(intf),
685 desc->wMaxPacketSize,
686 GFP_KERNEL,
687 &desc->validity->transfer_dma);
688 if (!desc->sbuf)
689 goto err;
690
691 desc->inbuf = usb_buffer_alloc(interface_to_usbdev(intf),
692 desc->bMaxPacketSize0,
693 GFP_KERNEL,
694 &desc->response->transfer_dma);
695 if (!desc->inbuf)
696 goto err2;
697
698 usb_fill_int_urb(
699 desc->validity,
700 interface_to_usbdev(intf),
701 usb_rcvintpipe(interface_to_usbdev(intf), ep->bEndpointAddress),
702 desc->sbuf,
703 desc->wMaxPacketSize,
704 wdm_int_callback,
705 desc,
706 ep->bInterval
707 );
708 desc->validity->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
709
710 usb_set_intfdata(intf, desc);
711 rv = usb_register_dev(intf, &wdm_class);
712 dev_info(&intf->dev, "cdc-wdm%d: USB WDM device\n",
713 intf->minor - WDM_MINOR_BASE);
714 if (rv < 0)
715 goto err;
716 out:
717 return rv;
718 err2:
719 usb_buffer_free(interface_to_usbdev(desc->intf),
720 desc->wMaxPacketSize,
721 desc->sbuf,
722 desc->validity->transfer_dma);
723 err:
724 free_urbs(desc);
725 kfree(desc->ubuf);
726 kfree(desc->orq);
727 kfree(desc->irq);
728 kfree(desc);
729 return rv;
730 }
731
732 static void wdm_disconnect(struct usb_interface *intf)
733 {
734 struct wdm_device *desc;
735 unsigned long flags;
736
737 usb_deregister_dev(intf, &wdm_class);
738 mutex_lock(&wdm_mutex);
739 desc = usb_get_intfdata(intf);
740
741 /* the spinlock makes sure no new urbs are generated in the callbacks */
742 spin_lock_irqsave(&desc->iuspin, flags);
743 set_bit(WDM_DISCONNECTING, &desc->flags);
744 set_bit(WDM_READ, &desc->flags);
745 /* to terminate pending flushes */
746 clear_bit(WDM_IN_USE, &desc->flags);
747 spin_unlock_irqrestore(&desc->iuspin, flags);
748 cancel_work_sync(&desc->rxwork);
749 kill_urbs(desc);
750 wake_up_all(&desc->wait);
751 if (!desc->count)
752 cleanup(desc);
753 mutex_unlock(&wdm_mutex);
754 }
755
756 static int wdm_suspend(struct usb_interface *intf, pm_message_t message)
757 {
758 struct wdm_device *desc = usb_get_intfdata(intf);
759 int rv = 0;
760
761 dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor);
762
763 mutex_lock(&desc->plock);
764 #ifdef CONFIG_PM
765 if (interface_to_usbdev(desc->intf)->auto_pm && test_bit(WDM_IN_USE, &desc->flags)) {
766 rv = -EBUSY;
767 } else {
768 #endif
769 cancel_work_sync(&desc->rxwork);
770 kill_urbs(desc);
771 #ifdef CONFIG_PM
772 }
773 #endif
774 mutex_unlock(&desc->plock);
775
776 return rv;
777 }
778
779 static int recover_from_urb_loss(struct wdm_device *desc)
780 {
781 int rv = 0;
782
783 if (desc->count) {
784 rv = usb_submit_urb(desc->validity, GFP_NOIO);
785 if (rv < 0)
786 dev_err(&desc->intf->dev,
787 "Error resume submitting int urb - %d\n", rv);
788 }
789 return rv;
790 }
791 static int wdm_resume(struct usb_interface *intf)
792 {
793 struct wdm_device *desc = usb_get_intfdata(intf);
794 int rv;
795
796 dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor);
797 mutex_lock(&desc->plock);
798 rv = recover_from_urb_loss(desc);
799 mutex_unlock(&desc->plock);
800 return rv;
801 }
802
803 static int wdm_pre_reset(struct usb_interface *intf)
804 {
805 struct wdm_device *desc = usb_get_intfdata(intf);
806
807 mutex_lock(&desc->plock);
808 return 0;
809 }
810
811 static int wdm_post_reset(struct usb_interface *intf)
812 {
813 struct wdm_device *desc = usb_get_intfdata(intf);
814 int rv;
815
816 rv = recover_from_urb_loss(desc);
817 mutex_unlock(&desc->plock);
818 return 0;
819 }
820
821 static struct usb_driver wdm_driver = {
822 .name = "cdc_wdm",
823 .probe = wdm_probe,
824 .disconnect = wdm_disconnect,
825 .suspend = wdm_suspend,
826 .resume = wdm_resume,
827 .reset_resume = wdm_resume,
828 .pre_reset = wdm_pre_reset,
829 .post_reset = wdm_post_reset,
830 .id_table = wdm_ids,
831 .supports_autosuspend = 1,
832 };
833
834 /* --- low level module stuff --- */
835
836 static int __init wdm_init(void)
837 {
838 int rv;
839
840 rv = usb_register(&wdm_driver);
841
842 return rv;
843 }
844
845 static void __exit wdm_exit(void)
846 {
847 usb_deregister(&wdm_driver);
848 }
849
850 module_init(wdm_init);
851 module_exit(wdm_exit);
852
853 MODULE_AUTHOR(DRIVER_AUTHOR);
854 MODULE_DESCRIPTION(DRIVER_DESC);
855 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree