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36#include <linux/kernel.h>
37#include <linux/errno.h>
38#include <linux/init.h>
39#include <linux/slab.h>
40#include <linux/module.h>
41#include <linux/kobject.h>
42#include <linux/mutex.h>
43
44#include <linux/uaccess.h>
45#include <linux/input.h>
46#include <linux/usb.h>
47#include <linux/poll.h>
48
49#include "alphatrack.h"
50
51#define VENDOR_ID 0x165b
52#define PRODUCT_ID 0xfad1
53
54#ifdef CONFIG_USB_DYNAMIC_MINORS
55#define USB_ALPHATRACK_MINOR_BASE 0
56#else
57
58#define USB_ALPHATRACK_MINOR_BASE 176
59#endif
60
61
62static const struct usb_device_id usb_alphatrack_table[] = {
63 {USB_DEVICE(VENDOR_ID, PRODUCT_ID)},
64 {}
65};
66
67MODULE_DEVICE_TABLE(usb, usb_alphatrack_table);
68MODULE_VERSION("0.41");
69MODULE_AUTHOR("Mike Taht <m@taht.net>");
70MODULE_DESCRIPTION("Alphatrack USB Driver");
71MODULE_LICENSE("GPL");
72MODULE_SUPPORTED_DEVICE("Frontier Designs Alphatrack Control Surface");
73
74
75
76#define SUPPRESS_EXTRA_ONLINE_EVENTS 0
77#define BUFFERED_WRITES 0
78#define SUPPRESS_EXTRA_OFFLINE_EVENTS 0
79#define COMPRESS_FADER_EVENTS 0
80
81#define BUFFERED_READS 1
82#define RING_BUFFER_SIZE 512
83#define WRITE_BUFFER_SIZE 34
84#define ALPHATRACK_USB_TIMEOUT 10
85#define OUTPUT_CMD_SIZE 8
86#define INPUT_CMD_SIZE 12
87#define ALPHATRACK_DEBUG 0
88
89static int debug = ALPHATRACK_DEBUG;
90
91
92#define dbg_info(dev, format, arg...) do \
93 { if (debug) dev_info(dev , format , ## arg); } while (0)
94
95#define alphatrack_ocmd_info(dev, cmd, format, arg...)
96
97#define alphatrack_icmd_info(dev, cmd, format, arg...)
98
99
100
101module_param(debug, int, S_IRUGO | S_IWUSR);
102MODULE_PARM_DESC(debug, "Debug enabled or not");
103
104
105
106
107
108
109static int ring_buffer_size = RING_BUFFER_SIZE;
110
111module_param(ring_buffer_size, int, S_IRUGO);
112MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size");
113
114
115
116static int write_buffer_size = WRITE_BUFFER_SIZE;
117module_param(write_buffer_size, int, S_IRUGO);
118MODULE_PARM_DESC(write_buffer_size, "Write buffer size");
119
120
121
122
123
124
125static int min_interrupt_in_interval = ALPHATRACK_USB_TIMEOUT;
126module_param(min_interrupt_in_interval, int, 0);
127MODULE_PARM_DESC(min_interrupt_in_interval,
128 "Minimum interrupt in interval in ms");
129
130static int min_interrupt_out_interval = ALPHATRACK_USB_TIMEOUT;
131module_param(min_interrupt_out_interval, int, 0);
132MODULE_PARM_DESC(min_interrupt_out_interval,
133 "Minimum interrupt out interval in ms");
134
135
136
137struct usb_alphatrack {
138 struct mutex mtx;
139 struct usb_interface *intf;
140 int open_count;
141
142
143 struct alphatrack_icmd (*ring_buffer)[RING_BUFFER_SIZE];
144 struct alphatrack_ocmd (*write_buffer)[WRITE_BUFFER_SIZE];
145 unsigned int ring_head;
146 unsigned int ring_tail;
147
148 wait_queue_head_t read_wait;
149 wait_queue_head_t write_wait;
150
151 unsigned char *interrupt_in_buffer;
152 unsigned char *oldi_buffer;
153 struct usb_endpoint_descriptor *interrupt_in_endpoint;
154 struct urb *interrupt_in_urb;
155 int interrupt_in_interval;
156 size_t interrupt_in_endpoint_size;
157 int interrupt_in_running;
158 int interrupt_in_done;
159
160 char *interrupt_out_buffer;
161 struct usb_endpoint_descriptor *interrupt_out_endpoint;
162 struct urb *interrupt_out_urb;
163 int interrupt_out_interval;
164 size_t interrupt_out_endpoint_size;
165 int interrupt_out_busy;
166
167 atomic_t writes_pending;
168 int event;
169 int fader;
170 int lights;
171 unsigned char dump_state;
172 unsigned char enable;
173 unsigned char offline;
174 unsigned char verbose;
175 unsigned char last_cmd[OUTPUT_CMD_SIZE];
176 unsigned char screen[32];
177};
178
179
180static DEFINE_MUTEX(disconnect_mutex);
181
182
183
184static struct usb_driver usb_alphatrack_driver;
185
186
187
188
189
190static void usb_alphatrack_abort_transfers(struct usb_alphatrack *dev)
191{
192
193 if (dev->interrupt_in_running) {
194 dev->interrupt_in_running = 0;
195 if (dev->intf)
196 usb_kill_urb(dev->interrupt_in_urb);
197 }
198 if (dev->interrupt_out_busy)
199 if (dev->intf)
200 usb_kill_urb(dev->interrupt_out_urb);
201}
202
203
204static void usb_alphatrack_delete(struct usb_alphatrack *dev)
205{
206 usb_alphatrack_abort_transfers(dev);
207 usb_free_urb(dev->interrupt_in_urb);
208 usb_free_urb(dev->interrupt_out_urb);
209 kfree(dev->ring_buffer);
210 kfree(dev->interrupt_in_buffer);
211 kfree(dev->interrupt_out_buffer);
212 kfree(dev);
213}
214
215
216
217static void usb_alphatrack_interrupt_in_callback(struct urb *urb)
218{
219 struct usb_alphatrack *dev = urb->context;
220 unsigned int next_ring_head;
221 int retval = -1;
222
223 if (urb->status) {
224 if (urb->status == -ENOENT ||
225 urb->status == -ECONNRESET || urb->status == -ESHUTDOWN) {
226 goto exit;
227 } else {
228 dbg_info(&dev->intf->dev,
229 "%s: nonzero status received: %d\n", __func__,
230 urb->status);
231 goto resubmit;
232 }
233 }
234
235 if (urb->actual_length != INPUT_CMD_SIZE) {
236 dev_warn(&dev->intf->dev,
237 "Urb length was %d bytes!!"
238 "Do something intelligent\n", urb->actual_length);
239 } else {
240 alphatrack_ocmd_info(&dev->intf->dev,
241 &(*dev->ring_buffer)[dev->ring_tail].cmd,
242 "%s", "bla");
243 if (memcmp
244 (dev->interrupt_in_buffer, dev->oldi_buffer,
245 INPUT_CMD_SIZE) == 0) {
246 goto resubmit;
247 }
248 memcpy(dev->oldi_buffer, dev->interrupt_in_buffer,
249 INPUT_CMD_SIZE);
250
251#if SUPPRESS_EXTRA_OFFLINE_EVENTS
252 if (dev->offline == 2 && dev->interrupt_in_buffer[1] == 0xff)
253 goto resubmit;
254 if (dev->offline == 1 && dev->interrupt_in_buffer[1] == 0xff) {
255 dev->offline = 2;
256 goto resubmit;
257 }
258
259 if (dev->offline > 0 && dev->interrupt_in_buffer[1] != 0xff)
260 dev->offline = 0;
261 if (dev->offline == 0 && dev->interrupt_in_buffer[1] == 0xff)
262 dev->offline = 1;
263#endif
264 dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n",
265 __func__, dev->ring_head, dev->ring_tail);
266 next_ring_head = (dev->ring_head + 1) % ring_buffer_size;
267
268 if (next_ring_head != dev->ring_tail) {
269 memcpy(&((*dev->ring_buffer)[dev->ring_head]),
270 dev->interrupt_in_buffer, urb->actual_length);
271 dev->ring_head = next_ring_head;
272 retval = 0;
273 memset(dev->interrupt_in_buffer, 0, urb->actual_length);
274 } else {
275 dev_warn(&dev->intf->dev,
276 "Ring buffer overflow, %d bytes dropped\n",
277 urb->actual_length);
278 memset(dev->interrupt_in_buffer, 0, urb->actual_length);
279 }
280 }
281
282resubmit:
283
284 if (dev->interrupt_in_running && dev->intf) {
285 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC);
286 if (retval)
287 dev_err(&dev->intf->dev,
288 "usb_submit_urb failed (%d)\n", retval);
289 }
290
291exit:
292 dev->interrupt_in_done = 1;
293 wake_up_interruptible(&dev->read_wait);
294}
295
296
297static void usb_alphatrack_interrupt_out_callback(struct urb *urb)
298{
299 struct usb_alphatrack *dev = urb->context;
300
301
302 if (urb->status && !(urb->status == -ENOENT ||
303 urb->status == -ECONNRESET ||
304 urb->status == -ESHUTDOWN))
305 dbg_info(&dev->intf->dev,
306 "%s - nonzero write interrupt status received: %d\n",
307 __func__, urb->status);
308 atomic_dec(&dev->writes_pending);
309 dev->interrupt_out_busy = 0;
310 wake_up_interruptible(&dev->write_wait);
311}
312
313
314static int usb_alphatrack_open(struct inode *inode, struct file *file)
315{
316 struct usb_alphatrack *dev;
317 int subminor;
318 int retval = 0;
319 struct usb_interface *interface;
320
321 nonseekable_open(inode, file);
322 subminor = iminor(inode);
323
324 mutex_lock(&disconnect_mutex);
325
326 interface = usb_find_interface(&usb_alphatrack_driver, subminor);
327
328 if (!interface) {
329 pr_err("%s - error, can't find device for minor %d\n",
330 __func__, subminor);
331 retval = -ENODEV;
332 goto unlock_disconnect_exit;
333 }
334
335 dev = usb_get_intfdata(interface);
336
337 if (!dev) {
338 retval = -ENODEV;
339 goto unlock_disconnect_exit;
340 }
341
342
343 if (mutex_lock_interruptible(&dev->mtx)) {
344 retval = -ERESTARTSYS;
345 goto unlock_disconnect_exit;
346 }
347
348
349 if (dev->open_count) {
350 retval = -EBUSY;
351 goto unlock_exit;
352 }
353 dev->open_count = 1;
354
355
356 dev->ring_head = 0;
357 dev->ring_tail = 0;
358 usb_fill_int_urb(dev->interrupt_in_urb,
359 interface_to_usbdev(interface),
360 usb_rcvintpipe(interface_to_usbdev(interface),
361 dev->interrupt_in_endpoint->
362 bEndpointAddress),
363 dev->interrupt_in_buffer,
364 dev->interrupt_in_endpoint_size,
365 usb_alphatrack_interrupt_in_callback, dev,
366 dev->interrupt_in_interval);
367
368 dev->interrupt_in_running = 1;
369 dev->interrupt_in_done = 0;
370 dev->enable = 1;
371 dev->offline = 0;
372
373 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
374 if (retval) {
375 dev_err(&interface->dev,
376 "Couldn't submit interrupt_in_urb %d\n", retval);
377 dev->interrupt_in_running = 0;
378 dev->open_count = 0;
379 goto unlock_exit;
380 }
381
382
383 file->private_data = dev;
384
385unlock_exit:
386 mutex_unlock(&dev->mtx);
387
388unlock_disconnect_exit:
389 mutex_unlock(&disconnect_mutex);
390
391 return retval;
392}
393
394
395static int usb_alphatrack_release(struct inode *inode, struct file *file)
396{
397 struct usb_alphatrack *dev;
398 int retval = 0;
399
400 dev = file->private_data;
401
402 if (dev == NULL) {
403 retval = -ENODEV;
404 goto exit;
405 }
406
407 if (mutex_lock_interruptible(&dev->mtx)) {
408 retval = -ERESTARTSYS;
409 goto exit;
410 }
411
412 if (dev->open_count != 1) {
413 retval = -ENODEV;
414 goto unlock_exit;
415 }
416
417 if (dev->intf == NULL) {
418
419 mutex_unlock(&dev->mtx);
420
421 usb_alphatrack_delete(dev);
422 retval = -ENODEV;
423 goto exit;
424 }
425
426
427 if (dev->interrupt_out_busy)
428 wait_event_interruptible_timeout(dev->write_wait,
429 !dev->interrupt_out_busy,
430 2 * HZ);
431 usb_alphatrack_abort_transfers(dev);
432 dev->open_count = 0;
433
434unlock_exit:
435 mutex_unlock(&dev->mtx);
436
437exit:
438 return retval;
439}
440
441
442static unsigned int usb_alphatrack_poll(struct file *file, poll_table *wait)
443{
444 struct usb_alphatrack *dev;
445 unsigned int mask = 0;
446
447 dev = file->private_data;
448
449 poll_wait(file, &dev->read_wait, wait);
450 poll_wait(file, &dev->write_wait, wait);
451
452 if (dev->ring_head != dev->ring_tail)
453 mask |= POLLIN | POLLRDNORM;
454 if (!dev->interrupt_out_busy)
455 mask |= POLLOUT | POLLWRNORM;
456
457 return mask;
458}
459
460
461static ssize_t usb_alphatrack_read(struct file *file, char __user *buffer,
462 size_t count, loff_t *ppos)
463{
464 struct usb_alphatrack *dev;
465 int retval = 0;
466
467 int c = 0;
468
469 dev = file->private_data;
470
471
472 if (count == 0)
473 goto exit;
474
475
476 if (mutex_lock_interruptible(&dev->mtx)) {
477 retval = -ERESTARTSYS;
478 goto exit;
479 }
480
481
482 if (dev->intf == NULL) {
483 retval = -ENODEV;
484 pr_err("%s: No device or device unplugged %d\n",
485 __func__, retval);
486 goto unlock_exit;
487 }
488
489 while (dev->ring_head == dev->ring_tail) {
490 if (file->f_flags & O_NONBLOCK) {
491 retval = -EAGAIN;
492 goto unlock_exit;
493 }
494 dev->interrupt_in_done = 0;
495 retval =
496 wait_event_interruptible(dev->read_wait,
497 dev->interrupt_in_done);
498 if (retval < 0)
499 goto unlock_exit;
500 }
501
502 alphatrack_ocmd_info(&dev->intf->dev,
503 &(*dev->ring_buffer)[dev->ring_tail].cmd, "%s",
504 ": copying to userspace");
505
506 c = 0;
507 while ((c < count) && (dev->ring_tail != dev->ring_head)) {
508 if (copy_to_user
509 (&buffer[c], &(*dev->ring_buffer)[dev->ring_tail],
510 INPUT_CMD_SIZE)) {
511 retval = -EFAULT;
512 goto unlock_exit;
513 }
514 dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size;
515 c += INPUT_CMD_SIZE;
516 dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n",
517 __func__, dev->ring_head, dev->ring_tail);
518 }
519 retval = c;
520
521unlock_exit:
522
523 mutex_unlock(&dev->mtx);
524
525exit:
526 return retval;
527}
528
529
530static ssize_t usb_alphatrack_write(struct file *file,
531 const char __user *buffer, size_t count,
532 loff_t *ppos)
533{
534 struct usb_alphatrack *dev;
535 size_t bytes_to_write;
536 int retval = 0;
537
538 dev = file->private_data;
539
540
541 if (count == 0)
542 goto exit;
543
544
545 if (mutex_lock_interruptible(&dev->mtx)) {
546 retval = -ERESTARTSYS;
547 goto exit;
548 }
549
550
551 if (dev->intf == NULL) {
552 retval = -ENODEV;
553 pr_err("%s: No device or device unplugged %d\n",
554 __func__, retval);
555 goto unlock_exit;
556 }
557
558
559 if (dev->interrupt_out_busy) {
560 if (file->f_flags & O_NONBLOCK) {
561 retval = -EAGAIN;
562 goto unlock_exit;
563 }
564 retval =
565 wait_event_interruptible(dev->write_wait,
566 !dev->interrupt_out_busy);
567 if (retval < 0)
568 goto unlock_exit;
569 }
570
571
572
573 bytes_to_write =
574 min(count, write_buffer_size * dev->interrupt_out_endpoint_size);
575 if (bytes_to_write < count)
576 dev_warn(&dev->intf->dev,
577 "Write buffer overflow, %zd bytes dropped\n",
578 count - bytes_to_write);
579
580 dbg_info(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n",
581 __func__, count, bytes_to_write);
582
583 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) {
584 retval = -EFAULT;
585 goto unlock_exit;
586 }
587
588 if (dev->interrupt_out_endpoint == NULL) {
589 dev_err(&dev->intf->dev, "Endpoint should not be null!\n");
590 goto unlock_exit;
591 }
592
593
594 usb_fill_int_urb(dev->interrupt_out_urb,
595 interface_to_usbdev(dev->intf),
596 usb_sndintpipe(interface_to_usbdev(dev->intf),
597 dev->interrupt_out_endpoint->
598 bEndpointAddress),
599 dev->interrupt_out_buffer, bytes_to_write,
600 usb_alphatrack_interrupt_out_callback, dev,
601 dev->interrupt_out_interval);
602 dev->interrupt_out_busy = 1;
603 atomic_inc(&dev->writes_pending);
604 wmb();
605
606 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
607 if (retval) {
608 dev->interrupt_out_busy = 0;
609 dev_err(&dev->intf->dev,
610 "Couldn't submit interrupt_out_urb %d\n", retval);
611 atomic_dec(&dev->writes_pending);
612 goto unlock_exit;
613 }
614 retval = bytes_to_write;
615
616unlock_exit:
617
618 mutex_unlock(&dev->mtx);
619
620exit:
621 return retval;
622}
623
624
625static const struct file_operations usb_alphatrack_fops = {
626 .owner = THIS_MODULE,
627 .read = usb_alphatrack_read,
628 .write = usb_alphatrack_write,
629 .open = usb_alphatrack_open,
630 .release = usb_alphatrack_release,
631 .poll = usb_alphatrack_poll,
632 .llseek = no_llseek,
633};
634
635
636
637
638
639
640static struct usb_class_driver usb_alphatrack_class = {
641 .name = "alphatrack%d",
642 .fops = &usb_alphatrack_fops,
643 .minor_base = USB_ALPHATRACK_MINOR_BASE,
644};
645
646
647
648
649
650
651
652static int usb_alphatrack_probe(struct usb_interface *intf,
653 const struct usb_device_id *id)
654{
655 struct usb_device *udev = interface_to_usbdev(intf);
656 struct usb_alphatrack *dev = NULL;
657 struct usb_host_interface *iface_desc;
658 struct usb_endpoint_descriptor *endpoint;
659 int i;
660 int true_size;
661 int retval = -ENOMEM;
662
663
664
665 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
666 if (dev == NULL)
667 goto exit;
668
669 mutex_init(&dev->mtx);
670 dev->intf = intf;
671 init_waitqueue_head(&dev->read_wait);
672 init_waitqueue_head(&dev->write_wait);
673
674 iface_desc = intf->cur_altsetting;
675
676
677 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
678 endpoint = &iface_desc->endpoint[i].desc;
679
680 if (usb_endpoint_is_int_in(endpoint))
681 dev->interrupt_in_endpoint = endpoint;
682
683 if (usb_endpoint_is_int_out(endpoint))
684 dev->interrupt_out_endpoint = endpoint;
685 }
686 if (dev->interrupt_in_endpoint == NULL) {
687 dev_err(&intf->dev, "Interrupt in endpoint not found\n");
688 goto error;
689 }
690 if (dev->interrupt_out_endpoint == NULL)
691 dev_warn(&intf->dev,
692 "Interrupt out endpoint not found"
693 "(using control endpoint instead)\n");
694
695 dev->interrupt_in_endpoint_size =
696 le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize);
697
698 if (dev->interrupt_in_endpoint_size != 64)
699 dev_warn(&intf->dev, "Interrupt in endpoint size is not 64!\n");
700
701 if (ring_buffer_size == 0)
702 ring_buffer_size = RING_BUFFER_SIZE;
703
704 true_size = min(ring_buffer_size, RING_BUFFER_SIZE);
705
706
707
708
709
710 dev->ring_buffer = kmalloc_array(true_size,
711 sizeof(struct alphatrack_icmd),
712 GFP_KERNEL);
713 if (!dev->ring_buffer)
714 goto error;
715
716 dev->interrupt_in_buffer = kmalloc(dev->interrupt_in_endpoint_size,
717 GFP_KERNEL);
718 if (!dev->interrupt_in_buffer)
719 goto error;
720
721 dev->oldi_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
722 if (!dev->oldi_buffer)
723 goto error;
724
725 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
726 if (!dev->interrupt_in_urb) {
727 dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n");
728 goto error;
729 }
730
731 dev->interrupt_out_endpoint_size =
732 dev->interrupt_out_endpoint ? le16_to_cpu(dev->
733 interrupt_out_endpoint->
734 wMaxPacketSize) : udev->
735 descriptor.bMaxPacketSize0;
736
737 if (dev->interrupt_out_endpoint_size != 64)
738 dev_warn(&intf->dev,
739 "Interrupt out endpoint size is not 64!)\n");
740
741 if (write_buffer_size == 0)
742 write_buffer_size = WRITE_BUFFER_SIZE;
743 true_size = min(write_buffer_size, WRITE_BUFFER_SIZE);
744
745 dev->interrupt_out_buffer =
746 kmalloc_array(true_size,
747 dev->interrupt_out_endpoint_size,
748 GFP_KERNEL);
749 if (!dev->interrupt_out_buffer)
750 goto error;
751
752 dev->write_buffer = kmalloc_array(true_size,
753 sizeof(struct alphatrack_ocmd),
754 GFP_KERNEL);
755 if (!dev->write_buffer)
756 goto error;
757
758 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
759 if (!dev->interrupt_out_urb) {
760 dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n");
761 goto error;
762 }
763 dev->interrupt_in_interval =
764 min_interrupt_in_interval >
765 dev->interrupt_in_endpoint->
766 bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint->
767 bInterval;
768 if (dev->interrupt_out_endpoint)
769 dev->interrupt_out_interval =
770 min_interrupt_out_interval >
771 dev->interrupt_out_endpoint->
772 bInterval ? min_interrupt_out_interval : dev->
773 interrupt_out_endpoint->bInterval;
774
775
776 usb_set_intfdata(intf, dev);
777
778 atomic_set(&dev->writes_pending, 0);
779 retval = usb_register_dev(intf, &usb_alphatrack_class);
780 if (retval) {
781
782 dev_err(&intf->dev,
783 "Not able to get a minor for this device.\n");
784 usb_set_intfdata(intf, NULL);
785 goto error;
786 }
787
788
789 dev_info(&intf->dev,
790 "Alphatrack Device #%d now attached to major %d minor %d\n",
791 (intf->minor - USB_ALPHATRACK_MINOR_BASE), USB_MAJOR,
792 intf->minor);
793
794exit:
795 return retval;
796
797error:
798 usb_alphatrack_delete(dev);
799
800 return retval;
801}
802
803
804
805
806
807
808static void usb_alphatrack_disconnect(struct usb_interface *intf)
809{
810 struct usb_alphatrack *dev;
811 int minor;
812
813 mutex_lock(&disconnect_mutex);
814
815 dev = usb_get_intfdata(intf);
816 usb_set_intfdata(intf, NULL);
817
818 mutex_lock(&dev->mtx);
819
820 minor = intf->minor;
821
822
823 usb_deregister_dev(intf, &usb_alphatrack_class);
824
825
826 if (!dev->open_count) {
827 mutex_unlock(&dev->mtx);
828 usb_alphatrack_delete(dev);
829 } else {
830 atomic_set(&dev->writes_pending, 0);
831 dev->intf = NULL;
832 mutex_unlock(&dev->mtx);
833 }
834
835 mutex_unlock(&disconnect_mutex);
836
837 dev_info(&intf->dev, "Alphatrack Surface #%d now disconnected\n",
838 (minor - USB_ALPHATRACK_MINOR_BASE));
839}
840
841
842static struct usb_driver usb_alphatrack_driver = {
843 .name = "alphatrack",
844 .probe = usb_alphatrack_probe,
845 .disconnect = usb_alphatrack_disconnect,
846 .id_table = usb_alphatrack_table,
847};
848
849module_usb_driver(usb_alphatrack_driver);
850