4 * This driver supports USB CDC WCM Device Management.
6 * Copyright (c) 2007-2009 Oliver Neukum
8 * Some code taken from cdc-acm.c
10 * Released under the GPLv2.
12 * Many thanks to Carl Nordbeck
14 #include <linux/kernel.h>
15 #include <linux/errno.h>
16 #include <linux/slab.h>
17 #include <linux/module.h>
18 #include <linux/mutex.h>
19 #include <linux/uaccess.h>
20 #include <linux/bitops.h>
21 #include <linux/poll.h>
22 #include <linux/usb.h>
23 #include <linux/usb/cdc.h>
24 #include <asm/byteorder.h>
25 #include <asm/unaligned.h>
26 #include <linux/usb/cdc-wdm.h>
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"
35 #define HUAWEI_VENDOR_ID 0x12D1
37 static const struct usb_device_id wdm_ids[] = {
39 .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS |
40 USB_DEVICE_ID_MATCH_INT_SUBCLASS,
41 .bInterfaceClass = USB_CLASS_COMM,
42 .bInterfaceSubClass = USB_CDC_SUBCLASS_DMM
46 * Huawei E392, E398 and possibly other Qualcomm based modems
47 * embed the Qualcomm QMI protocol inside CDC on CDC ECM like
48 * control interfaces. Userspace access to this is required
49 * to configure the accompanying data interface
51 .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
52 USB_DEVICE_ID_MATCH_INT_INFO,
53 .idVendor = HUAWEI_VENDOR_ID,
54 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
55 .bInterfaceSubClass = 1,
56 .bInterfaceProtocol = 9, /* NOTE: CDC ECM control interface! */
61 MODULE_DEVICE_TABLE (usb, wdm_ids);
63 #define WDM_MINOR_BASE 176
67 #define WDM_DISCONNECTING 2
70 #define WDM_INT_STALL 5
71 #define WDM_POLL_RUNNING 6
72 #define WDM_RESPONDING 7
73 #define WDM_SUSPENDING 8
74 #define WDM_RESETTING 9
78 /* CDC-WMC r1.1 requires wMaxCommand to be "at least 256 decimal (0x100)" */
79 #define WDM_DEFAULT_BUFSIZE 256
81 static DEFINE_MUTEX(wdm_mutex);
82 static DEFINE_SPINLOCK(wdm_device_list_lock);
83 static LIST_HEAD(wdm_device_list);
85 /* --- method tables --- */
88 u8 *inbuf; /* buffer for response */
89 u8 *outbuf; /* buffer for command */
90 u8 *sbuf; /* buffer for status */
91 u8 *ubuf; /* buffer for copy to user space */
96 struct usb_interface *intf;
97 struct usb_ctrlrequest *orq;
98 struct usb_ctrlrequest *irq;
114 wait_queue_head_t wait;
115 struct work_struct rxwork;
119 struct list_head device_list;
120 int (*manage_power)(struct usb_interface *, int);
123 static struct usb_driver wdm_driver;
125 /* return intfdata if we own the interface, else look up intf in the list */
126 static struct wdm_device *wdm_find_device(struct usb_interface *intf)
128 struct wdm_device *desc = NULL;
130 spin_lock(&wdm_device_list_lock);
131 list_for_each_entry(desc, &wdm_device_list, device_list)
132 if (desc->intf == intf)
134 spin_unlock(&wdm_device_list_lock);
139 static struct wdm_device *wdm_find_device_by_minor(int minor)
141 struct wdm_device *desc = NULL;
143 spin_lock(&wdm_device_list_lock);
144 list_for_each_entry(desc, &wdm_device_list, device_list)
145 if (desc->intf->minor == minor)
147 spin_unlock(&wdm_device_list_lock);
152 /* --- callbacks --- */
153 static void wdm_out_callback(struct urb *urb)
155 struct wdm_device *desc;
157 spin_lock(&desc->iuspin);
158 desc->werr = urb->status;
159 spin_unlock(&desc->iuspin);
160 clear_bit(WDM_IN_USE, &desc->flags);
162 wake_up(&desc->wait);
165 static void wdm_in_callback(struct urb *urb)
167 struct wdm_device *desc = urb->context;
168 int status = urb->status;
170 spin_lock(&desc->iuspin);
171 clear_bit(WDM_RESPONDING, &desc->flags);
176 dev_dbg(&desc->intf->dev,
177 "nonzero urb status received: -ENOENT");
180 dev_dbg(&desc->intf->dev,
181 "nonzero urb status received: -ECONNRESET");
184 dev_dbg(&desc->intf->dev,
185 "nonzero urb status received: -ESHUTDOWN");
188 dev_err(&desc->intf->dev,
189 "nonzero urb status received: -EPIPE\n");
192 dev_err(&desc->intf->dev,
193 "Unexpected error %d\n", status);
199 desc->reslength = urb->actual_length;
200 memmove(desc->ubuf + desc->length, desc->inbuf, desc->reslength);
201 desc->length += desc->reslength;
203 wake_up(&desc->wait);
205 set_bit(WDM_READ, &desc->flags);
206 spin_unlock(&desc->iuspin);
209 static void wdm_int_callback(struct urb *urb)
212 int status = urb->status;
213 struct wdm_device *desc;
214 struct usb_cdc_notification *dr;
217 dr = (struct usb_cdc_notification *)desc->sbuf;
226 set_bit(WDM_INT_STALL, &desc->flags);
227 dev_err(&desc->intf->dev, "Stall on int endpoint\n");
228 goto sw; /* halt is cleared in work */
230 dev_err(&desc->intf->dev,
231 "nonzero urb status received: %d\n", status);
236 if (urb->actual_length < sizeof(struct usb_cdc_notification)) {
237 dev_err(&desc->intf->dev, "wdm_int_callback - %d bytes\n",
242 switch (dr->bNotificationType) {
243 case USB_CDC_NOTIFY_RESPONSE_AVAILABLE:
244 dev_dbg(&desc->intf->dev,
245 "NOTIFY_RESPONSE_AVAILABLE received: index %d len %d",
246 dr->wIndex, dr->wLength);
249 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
251 dev_dbg(&desc->intf->dev,
252 "NOTIFY_NETWORK_CONNECTION %s network",
253 dr->wValue ? "connected to" : "disconnected from");
256 clear_bit(WDM_POLL_RUNNING, &desc->flags);
257 dev_err(&desc->intf->dev,
258 "unknown notification %d received: index %d len %d\n",
259 dr->bNotificationType, dr->wIndex, dr->wLength);
263 spin_lock(&desc->iuspin);
264 clear_bit(WDM_READ, &desc->flags);
265 set_bit(WDM_RESPONDING, &desc->flags);
266 if (!test_bit(WDM_DISCONNECTING, &desc->flags)
267 && !test_bit(WDM_SUSPENDING, &desc->flags)) {
268 rv = usb_submit_urb(desc->response, GFP_ATOMIC);
269 dev_dbg(&desc->intf->dev, "%s: usb_submit_urb %d",
272 spin_unlock(&desc->iuspin);
274 clear_bit(WDM_RESPONDING, &desc->flags);
279 rv = schedule_work(&desc->rxwork);
281 dev_err(&desc->intf->dev,
282 "Cannot schedule work\n");
286 rv = usb_submit_urb(urb, GFP_ATOMIC);
288 dev_err(&desc->intf->dev,
289 "%s - usb_submit_urb failed with result %d\n",
294 static void kill_urbs(struct wdm_device *desc)
296 /* the order here is essential */
297 usb_kill_urb(desc->command);
298 usb_kill_urb(desc->validity);
299 usb_kill_urb(desc->response);
302 static void free_urbs(struct wdm_device *desc)
304 usb_free_urb(desc->validity);
305 usb_free_urb(desc->response);
306 usb_free_urb(desc->command);
309 static void cleanup(struct wdm_device *desc)
311 spin_lock(&wdm_device_list_lock);
312 list_del(&desc->device_list);
313 spin_unlock(&wdm_device_list_lock);
323 static ssize_t wdm_write
324 (struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
327 int rv = -EMSGSIZE, r, we;
328 struct wdm_device *desc = file->private_data;
329 struct usb_ctrlrequest *req;
331 if (count > desc->wMaxCommand)
332 count = desc->wMaxCommand;
334 spin_lock_irq(&desc->iuspin);
337 spin_unlock_irq(&desc->iuspin);
341 desc->outbuf = buf = kmalloc(count, GFP_KERNEL);
347 r = copy_from_user(buf, buffer, count);
354 /* concurrent writes and disconnect */
355 r = mutex_lock_interruptible(&desc->wlock);
362 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
368 r = usb_autopm_get_interface(desc->intf);
374 if (!(file->f_flags & O_NONBLOCK))
375 r = wait_event_interruptible(desc->wait, !test_bit(WDM_IN_USE,
378 if (test_bit(WDM_IN_USE, &desc->flags))
381 if (test_bit(WDM_RESETTING, &desc->flags))
390 usb_fill_control_urb(
392 interface_to_usbdev(desc->intf),
393 /* using common endpoint 0 */
394 usb_sndctrlpipe(interface_to_usbdev(desc->intf), 0),
395 (unsigned char *)req,
402 req->bRequestType = (USB_DIR_OUT | USB_TYPE_CLASS |
403 USB_RECIP_INTERFACE);
404 req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND;
406 req->wIndex = desc->inum;
407 req->wLength = cpu_to_le16(count);
408 set_bit(WDM_IN_USE, &desc->flags);
410 rv = usb_submit_urb(desc->command, GFP_KERNEL);
413 clear_bit(WDM_IN_USE, &desc->flags);
414 dev_err(&desc->intf->dev, "Tx URB error: %d\n", rv);
416 dev_dbg(&desc->intf->dev, "Tx URB has been submitted index=%d",
420 usb_autopm_put_interface(desc->intf);
422 mutex_unlock(&desc->wlock);
424 return rv < 0 ? rv : count;
427 static ssize_t wdm_read
428 (struct file *file, char __user *buffer, size_t count, loff_t *ppos)
432 struct wdm_device *desc = file->private_data;
435 rv = mutex_lock_interruptible(&desc->rlock); /*concurrent reads */
439 cntr = ACCESS_ONCE(desc->length);
443 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
448 if (file->f_flags & O_NONBLOCK) {
449 if (!test_bit(WDM_READ, &desc->flags)) {
450 rv = cntr ? cntr : -EAGAIN;
455 rv = wait_event_interruptible(desc->wait,
456 test_bit(WDM_READ, &desc->flags));
459 /* may have happened while we slept */
460 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
464 if (test_bit(WDM_RESETTING, &desc->flags)) {
468 usb_mark_last_busy(interface_to_usbdev(desc->intf));
474 spin_lock_irq(&desc->iuspin);
476 if (desc->rerr) { /* read completed, error happened */
478 spin_unlock_irq(&desc->iuspin);
483 * recheck whether we've lost the race
484 * against the completion handler
486 if (!test_bit(WDM_READ, &desc->flags)) { /* lost race */
487 spin_unlock_irq(&desc->iuspin);
490 if (!desc->reslength) { /* zero length read */
491 spin_unlock_irq(&desc->iuspin);
495 spin_unlock_irq(&desc->iuspin);
500 rv = copy_to_user(buffer, desc->ubuf, cntr);
506 spin_lock_irq(&desc->iuspin);
508 for (i = 0; i < desc->length - cntr; i++)
509 desc->ubuf[i] = desc->ubuf[i + cntr];
511 desc->length -= cntr;
512 /* in case we had outstanding data */
514 clear_bit(WDM_READ, &desc->flags);
516 spin_unlock_irq(&desc->iuspin);
521 mutex_unlock(&desc->rlock);
525 static int wdm_flush(struct file *file, fl_owner_t id)
527 struct wdm_device *desc = file->private_data;
529 wait_event(desc->wait, !test_bit(WDM_IN_USE, &desc->flags));
531 dev_err(&desc->intf->dev, "Error in flush path: %d\n",
537 static unsigned int wdm_poll(struct file *file, struct poll_table_struct *wait)
539 struct wdm_device *desc = file->private_data;
541 unsigned int mask = 0;
543 spin_lock_irqsave(&desc->iuspin, flags);
544 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
546 spin_unlock_irqrestore(&desc->iuspin, flags);
549 if (test_bit(WDM_READ, &desc->flags))
550 mask = POLLIN | POLLRDNORM;
551 if (desc->rerr || desc->werr)
553 if (!test_bit(WDM_IN_USE, &desc->flags))
554 mask |= POLLOUT | POLLWRNORM;
555 spin_unlock_irqrestore(&desc->iuspin, flags);
557 poll_wait(file, &desc->wait, wait);
563 static int wdm_open(struct inode *inode, struct file *file)
565 int minor = iminor(inode);
567 struct usb_interface *intf;
568 struct wdm_device *desc;
570 mutex_lock(&wdm_mutex);
571 desc = wdm_find_device_by_minor(minor);
576 if (test_bit(WDM_DISCONNECTING, &desc->flags))
578 file->private_data = desc;
580 rv = usb_autopm_get_interface(desc->intf);
582 dev_err(&desc->intf->dev, "Error autopm - %d\n", rv);
586 /* using write lock to protect desc->count */
587 mutex_lock(&desc->wlock);
588 if (!desc->count++) {
591 rv = usb_submit_urb(desc->validity, GFP_KERNEL);
594 dev_err(&desc->intf->dev,
595 "Error submitting int urb - %d\n", rv);
600 mutex_unlock(&desc->wlock);
601 if (desc->count == 1)
602 desc->manage_power(intf, 1);
603 usb_autopm_put_interface(desc->intf);
605 mutex_unlock(&wdm_mutex);
609 static int wdm_release(struct inode *inode, struct file *file)
611 struct wdm_device *desc = file->private_data;
613 mutex_lock(&wdm_mutex);
615 /* using write lock to protect desc->count */
616 mutex_lock(&desc->wlock);
618 mutex_unlock(&desc->wlock);
621 dev_dbg(&desc->intf->dev, "wdm_release: cleanup");
623 if (!test_bit(WDM_DISCONNECTING, &desc->flags))
624 desc->manage_power(desc->intf, 0);
626 mutex_unlock(&wdm_mutex);
630 static const struct file_operations wdm_fops = {
631 .owner = THIS_MODULE,
636 .release = wdm_release,
638 .llseek = noop_llseek,
641 static struct usb_class_driver wdm_class = {
644 .minor_base = WDM_MINOR_BASE,
647 /* --- error handling --- */
648 static void wdm_rxwork(struct work_struct *work)
650 struct wdm_device *desc = container_of(work, struct wdm_device, rxwork);
654 spin_lock_irqsave(&desc->iuspin, flags);
655 if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
656 spin_unlock_irqrestore(&desc->iuspin, flags);
658 spin_unlock_irqrestore(&desc->iuspin, flags);
659 rv = usb_submit_urb(desc->response, GFP_KERNEL);
660 if (rv < 0 && rv != -EPERM) {
661 spin_lock_irqsave(&desc->iuspin, flags);
662 if (!test_bit(WDM_DISCONNECTING, &desc->flags))
663 schedule_work(&desc->rxwork);
664 spin_unlock_irqrestore(&desc->iuspin, flags);
669 /* --- hotplug --- */
671 static int wdm_create(struct usb_interface *intf, struct usb_endpoint_descriptor *ep,
672 u16 bufsize, int (*manage_power)(struct usb_interface *, int))
675 struct wdm_device *desc;
677 desc = kzalloc(sizeof(struct wdm_device), GFP_KERNEL);
680 INIT_LIST_HEAD(&desc->device_list);
681 mutex_init(&desc->rlock);
682 mutex_init(&desc->wlock);
683 spin_lock_init(&desc->iuspin);
684 init_waitqueue_head(&desc->wait);
685 desc->wMaxCommand = bufsize;
686 /* this will be expanded and needed in hardware endianness */
687 desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber);
689 INIT_WORK(&desc->rxwork, wdm_rxwork);
692 if (!usb_endpoint_is_int_in(ep))
695 desc->wMaxPacketSize = usb_endpoint_maxp(ep);
697 desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
700 desc->irq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
704 desc->validity = usb_alloc_urb(0, GFP_KERNEL);
708 desc->response = usb_alloc_urb(0, GFP_KERNEL);
712 desc->command = usb_alloc_urb(0, GFP_KERNEL);
716 desc->ubuf = kmalloc(desc->wMaxCommand, GFP_KERNEL);
720 desc->sbuf = kmalloc(desc->wMaxPacketSize, GFP_KERNEL);
724 desc->inbuf = kmalloc(desc->wMaxCommand, GFP_KERNEL);
730 interface_to_usbdev(intf),
731 usb_rcvintpipe(interface_to_usbdev(intf), ep->bEndpointAddress),
733 desc->wMaxPacketSize,
739 desc->irq->bRequestType = (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE);
740 desc->irq->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
741 desc->irq->wValue = 0;
742 desc->irq->wIndex = desc->inum;
743 desc->irq->wLength = cpu_to_le16(desc->wMaxCommand);
745 usb_fill_control_urb(
747 interface_to_usbdev(intf),
748 /* using common endpoint 0 */
749 usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0),
750 (unsigned char *)desc->irq,
757 desc->manage_power = manage_power;
759 spin_lock(&wdm_device_list_lock);
760 list_add(&desc->device_list, &wdm_device_list);
761 spin_unlock(&wdm_device_list_lock);
763 rv = usb_register_dev(intf, &wdm_class);
767 dev_info(&intf->dev, "%s: USB WDM device\n", dev_name(intf->usb_dev));
775 static int wdm_manage_power(struct usb_interface *intf, int on)
777 /* need autopm_get/put here to ensure the usbcore sees the new value */
778 int rv = usb_autopm_get_interface(intf);
782 intf->needs_remote_wakeup = on;
783 usb_autopm_put_interface(intf);
788 static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id)
791 struct usb_host_interface *iface;
792 struct usb_endpoint_descriptor *ep;
793 struct usb_cdc_dmm_desc *dmhd;
794 u8 *buffer = intf->altsetting->extra;
795 int buflen = intf->altsetting->extralen;
796 u16 maxcom = WDM_DEFAULT_BUFSIZE;
801 if (buffer[1] != USB_DT_CS_INTERFACE) {
802 dev_err(&intf->dev, "skipping garbage\n");
807 case USB_CDC_HEADER_TYPE:
809 case USB_CDC_DMM_TYPE:
810 dmhd = (struct usb_cdc_dmm_desc *)buffer;
811 maxcom = le16_to_cpu(dmhd->wMaxCommand);
813 "Finding maximum buffer length: %d", maxcom);
817 "Ignoring extra header, type %d, length %d\n",
818 buffer[2], buffer[0]);
826 iface = intf->cur_altsetting;
827 if (iface->desc.bNumEndpoints != 1)
829 ep = &iface->endpoint[0].desc;
831 rv = wdm_create(intf, ep, maxcom, &wdm_manage_power);
838 * usb_cdc_wdm_register - register a WDM subdriver
839 * @intf: usb interface the subdriver will associate with
840 * @ep: interrupt endpoint to monitor for notifications
841 * @bufsize: maximum message size to support for read/write
843 * Create WDM usb class character device and associate it with intf
844 * without binding, allowing another driver to manage the interface.
846 * The subdriver will manage the given interrupt endpoint exclusively
847 * and will issue control requests referring to the given intf. It
848 * will otherwise avoid interferring, and in particular not do
849 * usb_set_intfdata/usb_get_intfdata on intf.
851 * The return value is a pointer to the subdriver's struct usb_driver.
852 * The registering driver is responsible for calling this subdriver's
853 * disconnect, suspend, resume, pre_reset and post_reset methods from
856 struct usb_driver *usb_cdc_wdm_register(struct usb_interface *intf,
857 struct usb_endpoint_descriptor *ep,
859 int (*manage_power)(struct usb_interface *, int))
863 rv = wdm_create(intf, ep, bufsize, manage_power);
871 EXPORT_SYMBOL(usb_cdc_wdm_register);
873 static void wdm_disconnect(struct usb_interface *intf)
875 struct wdm_device *desc;
878 usb_deregister_dev(intf, &wdm_class);
879 desc = wdm_find_device(intf);
880 mutex_lock(&wdm_mutex);
882 /* the spinlock makes sure no new urbs are generated in the callbacks */
883 spin_lock_irqsave(&desc->iuspin, flags);
884 set_bit(WDM_DISCONNECTING, &desc->flags);
885 set_bit(WDM_READ, &desc->flags);
886 /* to terminate pending flushes */
887 clear_bit(WDM_IN_USE, &desc->flags);
888 spin_unlock_irqrestore(&desc->iuspin, flags);
889 wake_up_all(&desc->wait);
890 mutex_lock(&desc->rlock);
891 mutex_lock(&desc->wlock);
893 cancel_work_sync(&desc->rxwork);
894 mutex_unlock(&desc->wlock);
895 mutex_unlock(&desc->rlock);
898 mutex_unlock(&wdm_mutex);
902 static int wdm_suspend(struct usb_interface *intf, pm_message_t message)
904 struct wdm_device *desc = wdm_find_device(intf);
907 dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor);
909 /* if this is an autosuspend the caller does the locking */
910 if (!PMSG_IS_AUTO(message)) {
911 mutex_lock(&desc->rlock);
912 mutex_lock(&desc->wlock);
914 spin_lock_irq(&desc->iuspin);
916 if (PMSG_IS_AUTO(message) &&
917 (test_bit(WDM_IN_USE, &desc->flags)
918 || test_bit(WDM_RESPONDING, &desc->flags))) {
919 spin_unlock_irq(&desc->iuspin);
923 set_bit(WDM_SUSPENDING, &desc->flags);
924 spin_unlock_irq(&desc->iuspin);
925 /* callback submits work - order is essential */
927 cancel_work_sync(&desc->rxwork);
929 if (!PMSG_IS_AUTO(message)) {
930 mutex_unlock(&desc->wlock);
931 mutex_unlock(&desc->rlock);
938 static int recover_from_urb_loss(struct wdm_device *desc)
943 rv = usb_submit_urb(desc->validity, GFP_NOIO);
945 dev_err(&desc->intf->dev,
946 "Error resume submitting int urb - %d\n", rv);
952 static int wdm_resume(struct usb_interface *intf)
954 struct wdm_device *desc = wdm_find_device(intf);
957 dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor);
959 clear_bit(WDM_SUSPENDING, &desc->flags);
960 rv = recover_from_urb_loss(desc);
966 static int wdm_pre_reset(struct usb_interface *intf)
968 struct wdm_device *desc = wdm_find_device(intf);
971 * we notify everybody using poll of
972 * an exceptional situation
973 * must be done before recovery lest a spontaneous
974 * message from the device is lost
976 spin_lock_irq(&desc->iuspin);
977 set_bit(WDM_RESETTING, &desc->flags); /* inform read/write */
978 set_bit(WDM_READ, &desc->flags); /* unblock read */
979 clear_bit(WDM_IN_USE, &desc->flags); /* unblock write */
981 spin_unlock_irq(&desc->iuspin);
982 wake_up_all(&desc->wait);
983 mutex_lock(&desc->rlock);
984 mutex_lock(&desc->wlock);
986 cancel_work_sync(&desc->rxwork);
990 static int wdm_post_reset(struct usb_interface *intf)
992 struct wdm_device *desc = wdm_find_device(intf);
995 clear_bit(WDM_RESETTING, &desc->flags);
996 rv = recover_from_urb_loss(desc);
997 mutex_unlock(&desc->wlock);
998 mutex_unlock(&desc->rlock);
1002 static struct usb_driver wdm_driver = {
1005 .disconnect = wdm_disconnect,
1007 .suspend = wdm_suspend,
1008 .resume = wdm_resume,
1009 .reset_resume = wdm_resume,
1011 .pre_reset = wdm_pre_reset,
1012 .post_reset = wdm_post_reset,
1013 .id_table = wdm_ids,
1014 .supports_autosuspend = 1,
1017 module_usb_driver(wdm_driver);
1019 MODULE_AUTHOR(DRIVER_AUTHOR);
1020 MODULE_DESCRIPTION(DRIVER_DESC);
1021 MODULE_LICENSE("GPL");