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35#include <linux/kernel.h>
36#include <linux/errno.h>
37#include <linux/init.h>
38#include <linux/slab.h>
39#include <linux/module.h>
40#include <linux/kobject.h>
41#include <linux/mutex.h>
42
43#include <linux/uaccess.h>
44#include <linux/input.h>
45#include <linux/usb.h>
46#include <linux/poll.h>
47
48#include "alphatrack.h"
49
50#define VENDOR_ID 0x165b
51#define PRODUCT_ID 0xfad1
52
53#ifdef CONFIG_USB_DYNAMIC_MINORS
54#define USB_ALPHATRACK_MINOR_BASE 0
55#else
56
57#define USB_ALPHATRACK_MINOR_BASE 176
58#endif
59
60
61static struct usb_device_id usb_alphatrack_table[] = {
62 {USB_DEVICE(VENDOR_ID, PRODUCT_ID)},
63 {}
64};
65
66MODULE_DEVICE_TABLE(usb, usb_alphatrack_table);
67MODULE_VERSION("0.41");
68MODULE_AUTHOR("Mike Taht <m@taht.net>");
69MODULE_DESCRIPTION("Alphatrack USB Driver");
70MODULE_LICENSE("GPL");
71MODULE_SUPPORTED_DEVICE("Frontier Designs Alphatrack Control Surface");
72
73
74
75#define SUPPRESS_EXTRA_ONLINE_EVENTS 0
76#define BUFFERED_WRITES 0
77#define SUPPRESS_EXTRA_OFFLINE_EVENTS 0
78#define COMPRESS_FADER_EVENTS 0
79
80#define BUFFERED_READS 1
81#define RING_BUFFER_SIZE 512
82#define WRITE_BUFFER_SIZE 34
83#define ALPHATRACK_USB_TIMEOUT 10
84#define OUTPUT_CMD_SIZE 8
85#define INPUT_CMD_SIZE 12
86#define ALPHATRACK_DEBUG 0
87
88static int debug = ALPHATRACK_DEBUG;
89
90
91#define dbg_info(dev, format, arg...) do \
92 { if (debug) dev_info(dev , format , ## arg); } while (0)
93
94#define alphatrack_ocmd_info(dev, cmd, format, arg...)
95
96#define alphatrack_icmd_info(dev, cmd, format, arg...)
97
98
99
100module_param(debug, int, S_IRUGO | S_IWUSR);
101MODULE_PARM_DESC(debug, "Debug enabled or not");
102
103
104
105
106
107static int ring_buffer_size = RING_BUFFER_SIZE;
108
109module_param(ring_buffer_size, int, S_IRUGO);
110MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size");
111
112
113
114
115static int write_buffer_size = WRITE_BUFFER_SIZE;
116module_param(write_buffer_size, int, S_IRUGO);
117MODULE_PARM_DESC(write_buffer_size, "Write buffer size");
118
119
120
121
122
123
124static int min_interrupt_in_interval = ALPHATRACK_USB_TIMEOUT;
125module_param(min_interrupt_in_interval, int, 0);
126MODULE_PARM_DESC(min_interrupt_in_interval,
127 "Minimum interrupt in interval in ms");
128
129static int min_interrupt_out_interval = ALPHATRACK_USB_TIMEOUT;
130module_param(min_interrupt_out_interval, int, 0);
131MODULE_PARM_DESC(min_interrupt_out_interval,
132 "Minimum interrupt out interval in ms");
133
134
135
136struct usb_alphatrack {
137 struct semaphore sem;
138 struct usb_interface *intf;
139 int open_count;
140
141
142 struct alphatrack_icmd (*ring_buffer)[RING_BUFFER_SIZE];
143 struct alphatrack_ocmd (*write_buffer)[WRITE_BUFFER_SIZE];
144 unsigned int ring_head;
145 unsigned int ring_tail;
146
147 wait_queue_head_t read_wait;
148 wait_queue_head_t write_wait;
149
150 unsigned char *interrupt_in_buffer;
151 unsigned char *oldi_buffer;
152 struct usb_endpoint_descriptor *interrupt_in_endpoint;
153 struct urb *interrupt_in_urb;
154 int interrupt_in_interval;
155 size_t interrupt_in_endpoint_size;
156 int interrupt_in_running;
157 int interrupt_in_done;
158
159 char *interrupt_out_buffer;
160 struct usb_endpoint_descriptor *interrupt_out_endpoint;
161 struct urb *interrupt_out_urb;
162 int interrupt_out_interval;
163 size_t interrupt_out_endpoint_size;
164 int interrupt_out_busy;
165
166 atomic_t writes_pending;
167 int event;
168 int fader;
169 int lights;
170 unsigned char dump_state;
171 unsigned char enable;
172 unsigned char offline;
173 unsigned char verbose;
174 unsigned char last_cmd[OUTPUT_CMD_SIZE];
175 unsigned char screen[32];
176};
177
178
179static DEFINE_MUTEX(disconnect_mutex);
180
181
182
183static struct usb_driver usb_alphatrack_driver;
184
185
186
187
188
189static void usb_alphatrack_abort_transfers(struct usb_alphatrack *dev)
190{
191
192 if (dev->interrupt_in_running) {
193 dev->interrupt_in_running = 0;
194 if (dev->intf)
195 usb_kill_urb(dev->interrupt_in_urb);
196 }
197 if (dev->interrupt_out_busy)
198 if (dev->intf)
199 usb_kill_urb(dev->interrupt_out_urb);
200}
201
202
203
204
205static void usb_alphatrack_delete(struct usb_alphatrack *dev)
206{
207 usb_alphatrack_abort_transfers(dev);
208 usb_free_urb(dev->interrupt_in_urb);
209 usb_free_urb(dev->interrupt_out_urb);
210 kfree(dev->ring_buffer);
211 kfree(dev->interrupt_in_buffer);
212 kfree(dev->interrupt_out_buffer);
213 kfree(dev);
214}
215
216
217
218
219
220static void usb_alphatrack_interrupt_in_callback(struct urb *urb)
221{
222 struct usb_alphatrack *dev = urb->context;
223 unsigned int next_ring_head;
224 int retval = -1;
225
226 if (urb->status) {
227 if (urb->status == -ENOENT ||
228 urb->status == -ECONNRESET || urb->status == -ESHUTDOWN) {
229 goto exit;
230 } else {
231 dbg_info(&dev->intf->dev,
232 "%s: nonzero status received: %d\n", __func__,
233 urb->status);
234 goto resubmit;
235 }
236 }
237
238 if (urb->actual_length != INPUT_CMD_SIZE) {
239 dev_warn(&dev->intf->dev,
240 "Urb length was %d bytes!!"
241 "Do something intelligent \n", urb->actual_length);
242 } else {
243 alphatrack_ocmd_info(&dev->intf->dev,
244 &(*dev->ring_buffer)[dev->ring_tail].cmd,
245 "%s", "bla");
246 if (memcmp
247 (dev->interrupt_in_buffer, dev->oldi_buffer,
248 INPUT_CMD_SIZE) == 0) {
249 goto resubmit;
250 }
251 memcpy(dev->oldi_buffer, dev->interrupt_in_buffer,
252 INPUT_CMD_SIZE);
253
254#if SUPPRESS_EXTRA_OFFLINE_EVENTS
255 if (dev->offline == 2 && dev->interrupt_in_buffer[1] == 0xff)
256 goto resubmit;
257 if (dev->offline == 1 && dev->interrupt_in_buffer[1] == 0xff) {
258 dev->offline = 2;
259 goto resubmit;
260 }
261
262 if (dev->offline > 0 && dev->interrupt_in_buffer[1] != 0xff)
263 dev->offline = 0;
264 if (dev->offline == 0 && dev->interrupt_in_buffer[1] == 0xff)
265 dev->offline = 1;
266#endif
267 dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n",
268 __func__, dev->ring_head, dev->ring_tail);
269 next_ring_head = (dev->ring_head + 1) % ring_buffer_size;
270
271 if (next_ring_head != dev->ring_tail) {
272 memcpy(&((*dev->ring_buffer)[dev->ring_head]),
273 dev->interrupt_in_buffer, urb->actual_length);
274 dev->ring_head = next_ring_head;
275 retval = 0;
276 memset(dev->interrupt_in_buffer, 0, urb->actual_length);
277 } else {
278 dev_warn(&dev->intf->dev,
279 "Ring buffer overflow, %d bytes dropped\n",
280 urb->actual_length);
281 memset(dev->interrupt_in_buffer, 0, urb->actual_length);
282 }
283 }
284
285resubmit:
286
287 if (dev->interrupt_in_running && dev->intf) {
288 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC);
289 if (retval)
290 dev_err(&dev->intf->dev,
291 "usb_submit_urb failed (%d)\n", retval);
292 }
293
294exit:
295 dev->interrupt_in_done = 1;
296 wake_up_interruptible(&dev->read_wait);
297}
298
299
300
301
302static void usb_alphatrack_interrupt_out_callback(struct urb *urb)
303{
304 struct usb_alphatrack *dev = urb->context;
305
306
307 if (urb->status && !(urb->status == -ENOENT ||
308 urb->status == -ECONNRESET ||
309 urb->status == -ESHUTDOWN))
310 dbg_info(&dev->intf->dev,
311 "%s - nonzero write interrupt status received: %d\n",
312 __func__, urb->status);
313 atomic_dec(&dev->writes_pending);
314 dev->interrupt_out_busy = 0;
315 wake_up_interruptible(&dev->write_wait);
316}
317
318
319
320
321static int usb_alphatrack_open(struct inode *inode, struct file *file)
322{
323 struct usb_alphatrack *dev;
324 int subminor;
325 int retval = 0;
326 struct usb_interface *interface;
327
328 nonseekable_open(inode, file);
329 subminor = iminor(inode);
330
331 mutex_lock(&disconnect_mutex);
332
333 interface = usb_find_interface(&usb_alphatrack_driver, subminor);
334
335 if (!interface) {
336 err("%s - error, can't find device for minor %d\n",
337 __func__, subminor);
338 retval = -ENODEV;
339 goto unlock_disconnect_exit;
340 }
341
342 dev = usb_get_intfdata(interface);
343
344 if (!dev) {
345 retval = -ENODEV;
346 goto unlock_disconnect_exit;
347 }
348
349
350 if (down_interruptible(&dev->sem)) {
351 retval = -ERESTARTSYS;
352 goto unlock_disconnect_exit;
353 }
354
355
356 if (dev->open_count) {
357 retval = -EBUSY;
358 goto unlock_exit;
359 }
360 dev->open_count = 1;
361
362
363 dev->ring_head = 0;
364 dev->ring_tail = 0;
365 usb_fill_int_urb(dev->interrupt_in_urb,
366 interface_to_usbdev(interface),
367 usb_rcvintpipe(interface_to_usbdev(interface),
368 dev->interrupt_in_endpoint->
369 bEndpointAddress),
370 dev->interrupt_in_buffer,
371 dev->interrupt_in_endpoint_size,
372 usb_alphatrack_interrupt_in_callback, dev,
373 dev->interrupt_in_interval);
374
375 dev->interrupt_in_running = 1;
376 dev->interrupt_in_done = 0;
377 dev->enable = 1;
378 dev->offline = 0;
379
380 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
381 if (retval) {
382 dev_err(&interface->dev,
383 "Couldn't submit interrupt_in_urb %d\n", retval);
384 dev->interrupt_in_running = 0;
385 dev->open_count = 0;
386 goto unlock_exit;
387 }
388
389
390 file->private_data = dev;
391
392unlock_exit:
393 up(&dev->sem);
394
395unlock_disconnect_exit:
396 mutex_unlock(&disconnect_mutex);
397
398 return retval;
399}
400
401
402
403
404static int usb_alphatrack_release(struct inode *inode, struct file *file)
405{
406 struct usb_alphatrack *dev;
407 int retval = 0;
408
409 dev = file->private_data;
410
411 if (dev == NULL) {
412 retval = -ENODEV;
413 goto exit;
414 }
415
416 if (down_interruptible(&dev->sem)) {
417 retval = -ERESTARTSYS;
418 goto exit;
419 }
420
421 if (dev->open_count != 1) {
422 retval = -ENODEV;
423 goto unlock_exit;
424 }
425
426 if (dev->intf == NULL) {
427
428 up(&dev->sem);
429
430 usb_alphatrack_delete(dev);
431 retval = -ENODEV;
432 goto exit;
433 }
434
435
436 if (dev->interrupt_out_busy)
437 wait_event_interruptible_timeout(dev->write_wait,
438 !dev->interrupt_out_busy,
439 2 * HZ);
440 usb_alphatrack_abort_transfers(dev);
441 dev->open_count = 0;
442
443unlock_exit:
444 up(&dev->sem);
445
446exit:
447 return retval;
448}
449
450
451
452
453static unsigned int usb_alphatrack_poll(struct file *file, poll_table * wait)
454{
455 struct usb_alphatrack *dev;
456 unsigned int mask = 0;
457
458 dev = file->private_data;
459
460 poll_wait(file, &dev->read_wait, wait);
461 poll_wait(file, &dev->write_wait, wait);
462
463 if (dev->ring_head != dev->ring_tail)
464 mask |= POLLIN | POLLRDNORM;
465 if (!dev->interrupt_out_busy)
466 mask |= POLLOUT | POLLWRNORM;
467
468 return mask;
469}
470
471
472
473
474static ssize_t usb_alphatrack_read(struct file *file, char __user *buffer,
475 size_t count, loff_t *ppos)
476{
477 struct usb_alphatrack *dev;
478 int retval = 0;
479
480 int c = 0;
481
482 dev = file->private_data;
483
484
485 if (count == 0)
486 goto exit;
487
488
489 if (down_interruptible(&dev->sem)) {
490 retval = -ERESTARTSYS;
491 goto exit;
492 }
493
494
495 if (dev->intf == NULL) {
496 retval = -ENODEV;
497 err("No device or device unplugged %d\n", retval);
498 goto unlock_exit;
499 }
500
501 while (dev->ring_head == dev->ring_tail) {
502 if (file->f_flags & O_NONBLOCK) {
503 retval = -EAGAIN;
504 goto unlock_exit;
505 }
506 dev->interrupt_in_done = 0;
507 retval =
508 wait_event_interruptible(dev->read_wait,
509 dev->interrupt_in_done);
510 if (retval < 0)
511 goto unlock_exit;
512 }
513
514 alphatrack_ocmd_info(&dev->intf->dev,
515 &(*dev->ring_buffer)[dev->ring_tail].cmd, "%s",
516 ": copying to userspace");
517
518 c = 0;
519 while ((c < count) && (dev->ring_tail != dev->ring_head)) {
520 if (copy_to_user
521 (&buffer[c], &(*dev->ring_buffer)[dev->ring_tail],
522 INPUT_CMD_SIZE)) {
523 retval = -EFAULT;
524 goto unlock_exit;
525 }
526 dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size;
527 c += INPUT_CMD_SIZE;
528 dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n",
529 __func__, dev->ring_head, dev->ring_tail);
530 }
531 retval = c;
532
533unlock_exit:
534
535 up(&dev->sem);
536
537exit:
538 return retval;
539}
540
541
542
543
544static ssize_t usb_alphatrack_write(struct file *file,
545 const char __user *buffer, size_t count,
546 loff_t *ppos)
547{
548 struct usb_alphatrack *dev;
549 size_t bytes_to_write;
550 int retval = 0;
551
552 dev = file->private_data;
553
554
555 if (count == 0)
556 goto exit;
557
558
559 if (down_interruptible(&dev->sem)) {
560 retval = -ERESTARTSYS;
561 goto exit;
562 }
563
564
565 if (dev->intf == NULL) {
566 retval = -ENODEV;
567 err("No device or device unplugged %d\n", retval);
568 goto unlock_exit;
569 }
570
571
572 if (dev->interrupt_out_busy) {
573 if (file->f_flags & O_NONBLOCK) {
574 retval = -EAGAIN;
575 goto unlock_exit;
576 }
577 retval =
578 wait_event_interruptible(dev->write_wait,
579 !dev->interrupt_out_busy);
580 if (retval < 0)
581 goto unlock_exit;
582 }
583
584
585
586 bytes_to_write =
587 min(count, write_buffer_size * dev->interrupt_out_endpoint_size);
588 if (bytes_to_write < count)
589 dev_warn(&dev->intf->dev,
590 "Write buffer overflow, %zd bytes dropped\n",
591 count - bytes_to_write);
592
593 dbg_info(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n",
594 __func__, count, bytes_to_write);
595
596 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) {
597 retval = -EFAULT;
598 goto unlock_exit;
599 }
600
601 if (dev->interrupt_out_endpoint == NULL) {
602 err("Endpoint should not be be null! \n");
603 goto unlock_exit;
604 }
605
606
607 usb_fill_int_urb(dev->interrupt_out_urb,
608 interface_to_usbdev(dev->intf),
609 usb_sndintpipe(interface_to_usbdev(dev->intf),
610 dev->interrupt_out_endpoint->
611 bEndpointAddress),
612 dev->interrupt_out_buffer, bytes_to_write,
613 usb_alphatrack_interrupt_out_callback, dev,
614 dev->interrupt_out_interval);
615 dev->interrupt_out_busy = 1;
616 atomic_inc(&dev->writes_pending);
617 wmb();
618
619 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
620 if (retval) {
621 dev->interrupt_out_busy = 0;
622 err("Couldn't submit interrupt_out_urb %d\n", retval);
623 atomic_dec(&dev->writes_pending);
624 goto unlock_exit;
625 }
626 retval = bytes_to_write;
627
628unlock_exit:
629
630 up(&dev->sem);
631
632exit:
633 return retval;
634}
635
636
637static const struct file_operations usb_alphatrack_fops = {
638 .owner = THIS_MODULE,
639 .read = usb_alphatrack_read,
640 .write = usb_alphatrack_write,
641 .open = usb_alphatrack_open,
642 .release = usb_alphatrack_release,
643 .poll = usb_alphatrack_poll,
644};
645
646
647
648
649
650
651static struct usb_class_driver usb_alphatrack_class = {
652 .name = "alphatrack%d",
653 .fops = &usb_alphatrack_fops,
654 .minor_base = USB_ALPHATRACK_MINOR_BASE,
655};
656
657
658
659
660
661
662
663static int usb_alphatrack_probe(struct usb_interface *intf,
664 const struct usb_device_id *id)
665{
666 struct usb_device *udev = interface_to_usbdev(intf);
667 struct usb_alphatrack *dev = NULL;
668 struct usb_host_interface *iface_desc;
669 struct usb_endpoint_descriptor *endpoint;
670 int i;
671 int true_size;
672 int retval = -ENOMEM;
673
674
675
676 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
677 if (dev == NULL) {
678 dev_err(&intf->dev, "Out of memory\n");
679 goto exit;
680 }
681 init_MUTEX(&dev->sem);
682 dev->intf = intf;
683 init_waitqueue_head(&dev->read_wait);
684 init_waitqueue_head(&dev->write_wait);
685
686 iface_desc = intf->cur_altsetting;
687
688
689 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
690 endpoint = &iface_desc->endpoint[i].desc;
691
692 if (usb_endpoint_is_int_in(endpoint))
693 dev->interrupt_in_endpoint = endpoint;
694
695 if (usb_endpoint_is_int_out(endpoint))
696 dev->interrupt_out_endpoint = endpoint;
697 }
698 if (dev->interrupt_in_endpoint == NULL) {
699 dev_err(&intf->dev, "Interrupt in endpoint not found\n");
700 goto error;
701 }
702 if (dev->interrupt_out_endpoint == NULL)
703 dev_warn(&intf->dev,
704 "Interrupt out endpoint not found"
705 "(using control endpoint instead)\n");
706
707 dev->interrupt_in_endpoint_size =
708 le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize);
709
710 if (dev->interrupt_in_endpoint_size != 64)
711 dev_warn(&intf->dev, "Interrupt in endpoint size is not 64!\n");
712
713 if (ring_buffer_size == 0)
714 ring_buffer_size = RING_BUFFER_SIZE;
715
716 true_size = min(ring_buffer_size, RING_BUFFER_SIZE);
717
718
719
720 dev->ring_buffer =
721 kmalloc((true_size * sizeof(struct alphatrack_icmd)), GFP_KERNEL);
722
723 if (!dev->ring_buffer) {
724 dev_err(&intf->dev,
725 "Couldn't allocate input ring_buffer of size %d\n",
726 true_size);
727 goto error;
728 }
729
730 dev->interrupt_in_buffer =
731 kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
732
733 if (!dev->interrupt_in_buffer) {
734 dev_err(&intf->dev, "Couldn't allocate interrupt_in_buffer\n");
735 goto error;
736 }
737 dev->oldi_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
738 if (!dev->oldi_buffer) {
739 dev_err(&intf->dev, "Couldn't allocate old buffer\n");
740 goto error;
741 }
742 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
743 if (!dev->interrupt_in_urb) {
744 dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n");
745 goto error;
746 }
747
748 dev->interrupt_out_endpoint_size =
749 dev->interrupt_out_endpoint ? le16_to_cpu(dev->
750 interrupt_out_endpoint->
751 wMaxPacketSize) : udev->
752 descriptor.bMaxPacketSize0;
753
754 if (dev->interrupt_out_endpoint_size != 64)
755 dev_warn(&intf->dev,
756 "Interrupt out endpoint size is not 64!)\n");
757
758 if (write_buffer_size == 0)
759 write_buffer_size = WRITE_BUFFER_SIZE;
760 true_size = min(write_buffer_size, WRITE_BUFFER_SIZE);
761
762 dev->interrupt_out_buffer =
763 kmalloc(true_size * dev->interrupt_out_endpoint_size, GFP_KERNEL);
764
765 if (!dev->interrupt_out_buffer) {
766 dev_err(&intf->dev, "Couldn't allocate interrupt_out_buffer\n");
767 goto error;
768 }
769
770 dev->write_buffer =
771 kmalloc(sizeof(struct alphatrack_ocmd) * true_size, GFP_KERNEL);
772
773 if (!dev->write_buffer) {
774 dev_err(&intf->dev, "Couldn't allocate write_buffer \n");
775 goto error;
776 }
777
778 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
779 if (!dev->interrupt_out_urb) {
780 dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n");
781 goto error;
782 }
783 dev->interrupt_in_interval =
784 min_interrupt_in_interval >
785 dev->interrupt_in_endpoint->
786 bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint->
787 bInterval;
788 if (dev->interrupt_out_endpoint)
789 dev->interrupt_out_interval =
790 min_interrupt_out_interval >
791 dev->interrupt_out_endpoint->
792 bInterval ? min_interrupt_out_interval : dev->
793 interrupt_out_endpoint->bInterval;
794
795
796 usb_set_intfdata(intf, dev);
797
798 atomic_set(&dev->writes_pending, 0);
799 retval = usb_register_dev(intf, &usb_alphatrack_class);
800 if (retval) {
801
802 dev_err(&intf->dev,
803 "Not able to get a minor for this device.\n");
804 usb_set_intfdata(intf, NULL);
805 goto error;
806 }
807
808
809 dev_info(&intf->dev,
810 "Alphatrack Device #%d now attached to major %d minor %d\n",
811 (intf->minor - USB_ALPHATRACK_MINOR_BASE), USB_MAJOR,
812 intf->minor);
813
814exit:
815 return retval;
816
817error:
818 usb_alphatrack_delete(dev);
819
820 return retval;
821}
822
823
824
825
826
827
828static void usb_alphatrack_disconnect(struct usb_interface *intf)
829{
830 struct usb_alphatrack *dev;
831 int minor;
832
833 mutex_lock(&disconnect_mutex);
834
835 dev = usb_get_intfdata(intf);
836 usb_set_intfdata(intf, NULL);
837
838 down(&dev->sem);
839
840 minor = intf->minor;
841
842
843 usb_deregister_dev(intf, &usb_alphatrack_class);
844
845
846 if (!dev->open_count) {
847 up(&dev->sem);
848 usb_alphatrack_delete(dev);
849 } else {
850 dev->intf = NULL;
851 up(&dev->sem);
852 }
853
854 atomic_set(&dev->writes_pending, 0);
855 mutex_unlock(&disconnect_mutex);
856
857 dev_info(&intf->dev, "Alphatrack Surface #%d now disconnected\n",
858 (minor - USB_ALPHATRACK_MINOR_BASE));
859}
860
861
862static struct usb_driver usb_alphatrack_driver = {
863 .name = "alphatrack",
864 .probe = usb_alphatrack_probe,
865 .disconnect = usb_alphatrack_disconnect,
866 .id_table = usb_alphatrack_table,
867};
868
869
870
871
872static int __init usb_alphatrack_init(void)
873{
874 int retval;
875
876
877 retval = usb_register(&usb_alphatrack_driver);
878 if (retval)
879 err("usb_register failed for the " __FILE__
880 " driver. Error number %d\n", retval);
881
882 return retval;
883}
884
885
886
887
888static void __exit usb_alphatrack_exit(void)
889{
890
891 usb_deregister(&usb_alphatrack_driver);
892}
893
894module_init(usb_alphatrack_init);
895module_exit(usb_alphatrack_exit);
896