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27#include <linux/module.h>
28#include <linux/moduleparam.h>
29#include <linux/types.h>
30#include <linux/errno.h>
31#include <linux/kernel.h>
32#include <linux/delay.h>
33#include <linux/miscdevice.h>
34#include <linux/watchdog.h>
35#include <linux/notifier.h>
36#include <linux/reboot.h>
37#include <linux/init.h>
38#include <linux/fs.h>
39#include <linux/usb.h>
40#include <linux/slab.h>
41#include <linux/mutex.h>
42#include <linux/hid.h>
43#include <linux/uaccess.h>
44
45
46#ifdef CONFIG_USB_DEBUG
47 static int debug = 1;
48#else
49 static int debug;
50#endif
51
52
53#undef dbg
54#define dbg(format, arg...) \
55 do { if (debug) printk(KERN_DEBUG PFX format "\n" , ## arg); } while (0)
56
57
58#define DRIVER_VERSION "1.02"
59#define DRIVER_AUTHOR "Wim Van Sebroeck <wim@iguana.be>"
60#define DRIVER_DESC "Berkshire USB-PC Watchdog driver"
61#define DRIVER_LICENSE "GPL"
62#define DRIVER_NAME "pcwd_usb"
63#define PFX DRIVER_NAME ": "
64
65MODULE_AUTHOR(DRIVER_AUTHOR);
66MODULE_DESCRIPTION(DRIVER_DESC);
67MODULE_LICENSE(DRIVER_LICENSE);
68MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
69MODULE_ALIAS_MISCDEV(TEMP_MINOR);
70
71
72module_param(debug, int, 0);
73MODULE_PARM_DESC(debug, "Debug enabled or not");
74
75#define WATCHDOG_HEARTBEAT 0
76
77static int heartbeat = WATCHDOG_HEARTBEAT;
78module_param(heartbeat, int, 0);
79MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
80 "(0<heartbeat<65536 or 0=delay-time from dip-switches, default="
81 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
82
83static int nowayout = WATCHDOG_NOWAYOUT;
84module_param(nowayout, int, 0);
85MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
86 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
87
88
89#define USB_PCWD_VENDOR_ID 0x0c98
90#define USB_PCWD_PRODUCT_ID 0x1140
91
92
93static struct usb_device_id usb_pcwd_table[] = {
94 { USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) },
95 { }
96};
97MODULE_DEVICE_TABLE(usb, usb_pcwd_table);
98
99
100
101#define USB_COMMAND_TIMEOUT 250
102
103
104#define CMD_READ_TEMP 0x02
105
106#define CMD_TRIGGER CMD_READ_TEMP
107#define CMD_GET_STATUS 0x04
108#define CMD_GET_FIRMWARE_VERSION 0x08
109#define CMD_GET_DIP_SWITCH_SETTINGS 0x0c
110#define CMD_READ_WATCHDOG_TIMEOUT 0x18
111#define CMD_WRITE_WATCHDOG_TIMEOUT 0x19
112#define CMD_ENABLE_WATCHDOG 0x30
113#define CMD_DISABLE_WATCHDOG CMD_ENABLE_WATCHDOG
114
115
116static const int heartbeat_tbl[] = {
117 5,
118 10,
119 30,
120 60,
121 300,
122 600,
123 1800,
124 3600,
125};
126
127
128static int cards_found;
129
130
131static unsigned long is_active;
132static char expect_release;
133
134
135struct usb_pcwd_private {
136
137 struct usb_device *udev;
138
139 struct usb_interface *interface;
140
141
142 unsigned int interface_number;
143
144
145 unsigned char *intr_buffer;
146
147 dma_addr_t intr_dma;
148
149 size_t intr_size;
150
151 struct urb *intr_urb;
152
153
154 unsigned char cmd_command;
155
156 unsigned char cmd_data_msb;
157
158 unsigned char cmd_data_lsb;
159
160 atomic_t cmd_received;
161
162
163 int exists;
164
165 struct mutex mtx;
166};
167static struct usb_pcwd_private *usb_pcwd_device;
168
169
170static DEFINE_MUTEX(disconnect_mutex);
171
172
173static int usb_pcwd_probe(struct usb_interface *interface,
174 const struct usb_device_id *id);
175static void usb_pcwd_disconnect(struct usb_interface *interface);
176
177
178static struct usb_driver usb_pcwd_driver = {
179 .name = DRIVER_NAME,
180 .probe = usb_pcwd_probe,
181 .disconnect = usb_pcwd_disconnect,
182 .id_table = usb_pcwd_table,
183};
184
185
186static void usb_pcwd_intr_done(struct urb *urb)
187{
188 struct usb_pcwd_private *usb_pcwd =
189 (struct usb_pcwd_private *)urb->context;
190 unsigned char *data = usb_pcwd->intr_buffer;
191 int retval;
192
193 switch (urb->status) {
194 case 0:
195 break;
196 case -ECONNRESET:
197 case -ENOENT:
198 case -ESHUTDOWN:
199
200 dbg("%s - urb shutting down with status: %d", __func__,
201 urb->status);
202 return;
203
204 default:
205 dbg("%s - nonzero urb status received: %d", __func__,
206 urb->status);
207 goto resubmit;
208 }
209
210 dbg("received following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
211 data[0], data[1], data[2]);
212
213 usb_pcwd->cmd_command = data[0];
214 usb_pcwd->cmd_data_msb = data[1];
215 usb_pcwd->cmd_data_lsb = data[2];
216
217
218 atomic_set(&usb_pcwd->cmd_received, 1);
219
220resubmit:
221 retval = usb_submit_urb(urb, GFP_ATOMIC);
222 if (retval)
223 printk(KERN_ERR PFX "can't resubmit intr, "
224 "usb_submit_urb failed with result %d\n", retval);
225}
226
227static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd,
228 unsigned char cmd, unsigned char *msb, unsigned char *lsb)
229{
230 int got_response, count;
231 unsigned char buf[6];
232
233
234
235 if ((!usb_pcwd) || (!usb_pcwd->exists))
236 return -1;
237
238
239
240 buf[0] = cmd;
241 buf[1] = *msb;
242 buf[2] = *lsb;
243 buf[3] = buf[4] = buf[5] = 0;
244
245 dbg("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
246 buf[0], buf[1], buf[2]);
247
248 atomic_set(&usb_pcwd->cmd_received, 0);
249
250 if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0),
251 HID_REQ_SET_REPORT, HID_DT_REPORT,
252 0x0200, usb_pcwd->interface_number, buf, sizeof(buf),
253 USB_COMMAND_TIMEOUT) != sizeof(buf)) {
254 dbg("usb_pcwd_send_command: error in usb_control_msg for "
255 "cmd 0x%x 0x%x 0x%x\n", cmd, *msb, *lsb);
256 }
257
258
259 got_response = 0;
260 for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response);
261 count++) {
262 mdelay(1);
263 if (atomic_read(&usb_pcwd->cmd_received))
264 got_response = 1;
265 }
266
267 if ((got_response) && (cmd == usb_pcwd->cmd_command)) {
268
269 *msb = usb_pcwd->cmd_data_msb;
270 *lsb = usb_pcwd->cmd_data_lsb;
271 }
272
273 return got_response;
274}
275
276static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd)
277{
278 unsigned char msb = 0x00;
279 unsigned char lsb = 0x00;
280 int retval;
281
282
283 retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG,
284 &msb, &lsb);
285
286 if ((retval == 0) || (lsb == 0)) {
287 printk(KERN_ERR PFX
288 "Card did not acknowledge enable attempt\n");
289 return -1;
290 }
291
292 return 0;
293}
294
295static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd)
296{
297 unsigned char msb = 0xA5;
298 unsigned char lsb = 0xC3;
299 int retval;
300
301
302 retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG,
303 &msb, &lsb);
304
305 if ((retval == 0) || (lsb != 0)) {
306 printk(KERN_ERR PFX
307 "Card did not acknowledge disable attempt\n");
308 return -1;
309 }
310
311 return 0;
312}
313
314static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd)
315{
316 unsigned char dummy;
317
318
319 usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy);
320
321 return 0;
322}
323
324static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t)
325{
326 unsigned char msb = t / 256;
327 unsigned char lsb = t % 256;
328
329 if ((t < 0x0001) || (t > 0xFFFF))
330 return -EINVAL;
331
332
333 usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb);
334
335 heartbeat = t;
336 return 0;
337}
338
339static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd,
340 int *temperature)
341{
342 unsigned char msb, lsb;
343
344 usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb);
345
346
347
348
349
350 *temperature = (lsb * 9 / 5) + 32;
351
352 return 0;
353}
354
355static int usb_pcwd_get_timeleft(struct usb_pcwd_private *usb_pcwd,
356 int *time_left)
357{
358 unsigned char msb, lsb;
359
360
361
362 usb_pcwd_send_command(usb_pcwd, CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
363
364 *time_left = (msb << 8) + lsb;
365
366 return 0;
367}
368
369
370
371
372
373static ssize_t usb_pcwd_write(struct file *file, const char __user *data,
374 size_t len, loff_t *ppos)
375{
376
377 if (len) {
378 if (!nowayout) {
379 size_t i;
380
381
382
383 expect_release = 0;
384
385
386
387 for (i = 0; i != len; i++) {
388 char c;
389 if (get_user(c, data + i))
390 return -EFAULT;
391 if (c == 'V')
392 expect_release = 42;
393 }
394 }
395
396
397 usb_pcwd_keepalive(usb_pcwd_device);
398 }
399 return len;
400}
401
402static long usb_pcwd_ioctl(struct file *file, unsigned int cmd,
403 unsigned long arg)
404{
405 void __user *argp = (void __user *)arg;
406 int __user *p = argp;
407 static struct watchdog_info ident = {
408 .options = WDIOF_KEEPALIVEPING |
409 WDIOF_SETTIMEOUT |
410 WDIOF_MAGICCLOSE,
411 .firmware_version = 1,
412 .identity = DRIVER_NAME,
413 };
414
415 switch (cmd) {
416 case WDIOC_GETSUPPORT:
417 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
418
419 case WDIOC_GETSTATUS:
420 case WDIOC_GETBOOTSTATUS:
421 return put_user(0, p);
422
423 case WDIOC_GETTEMP:
424 {
425 int temperature;
426
427 if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
428 return -EFAULT;
429
430 return put_user(temperature, p);
431 }
432
433 case WDIOC_SETOPTIONS:
434 {
435 int new_options, retval = -EINVAL;
436
437 if (get_user(new_options, p))
438 return -EFAULT;
439
440 if (new_options & WDIOS_DISABLECARD) {
441 usb_pcwd_stop(usb_pcwd_device);
442 retval = 0;
443 }
444
445 if (new_options & WDIOS_ENABLECARD) {
446 usb_pcwd_start(usb_pcwd_device);
447 retval = 0;
448 }
449
450 return retval;
451 }
452
453 case WDIOC_KEEPALIVE:
454 usb_pcwd_keepalive(usb_pcwd_device);
455 return 0;
456
457 case WDIOC_SETTIMEOUT:
458 {
459 int new_heartbeat;
460
461 if (get_user(new_heartbeat, p))
462 return -EFAULT;
463
464 if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat))
465 return -EINVAL;
466
467 usb_pcwd_keepalive(usb_pcwd_device);
468
469 }
470
471 case WDIOC_GETTIMEOUT:
472 return put_user(heartbeat, p);
473
474 case WDIOC_GETTIMELEFT:
475 {
476 int time_left;
477
478 if (usb_pcwd_get_timeleft(usb_pcwd_device, &time_left))
479 return -EFAULT;
480
481 return put_user(time_left, p);
482 }
483
484 default:
485 return -ENOTTY;
486 }
487}
488
489static int usb_pcwd_open(struct inode *inode, struct file *file)
490{
491
492 if (test_and_set_bit(0, &is_active))
493 return -EBUSY;
494
495
496 usb_pcwd_start(usb_pcwd_device);
497 usb_pcwd_keepalive(usb_pcwd_device);
498 return nonseekable_open(inode, file);
499}
500
501static int usb_pcwd_release(struct inode *inode, struct file *file)
502{
503
504
505
506 if (expect_release == 42) {
507 usb_pcwd_stop(usb_pcwd_device);
508 } else {
509 printk(KERN_CRIT PFX
510 "Unexpected close, not stopping watchdog!\n");
511 usb_pcwd_keepalive(usb_pcwd_device);
512 }
513 expect_release = 0;
514 clear_bit(0, &is_active);
515 return 0;
516}
517
518
519
520
521
522static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data,
523 size_t len, loff_t *ppos)
524{
525 int temperature;
526
527 if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
528 return -EFAULT;
529
530 if (copy_to_user(data, &temperature, 1))
531 return -EFAULT;
532
533 return 1;
534}
535
536static int usb_pcwd_temperature_open(struct inode *inode, struct file *file)
537{
538 return nonseekable_open(inode, file);
539}
540
541static int usb_pcwd_temperature_release(struct inode *inode, struct file *file)
542{
543 return 0;
544}
545
546
547
548
549
550static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code,
551 void *unused)
552{
553 if (code == SYS_DOWN || code == SYS_HALT)
554 usb_pcwd_stop(usb_pcwd_device);
555
556 return NOTIFY_DONE;
557}
558
559
560
561
562
563static const struct file_operations usb_pcwd_fops = {
564 .owner = THIS_MODULE,
565 .llseek = no_llseek,
566 .write = usb_pcwd_write,
567 .unlocked_ioctl = usb_pcwd_ioctl,
568 .open = usb_pcwd_open,
569 .release = usb_pcwd_release,
570};
571
572static struct miscdevice usb_pcwd_miscdev = {
573 .minor = WATCHDOG_MINOR,
574 .name = "watchdog",
575 .fops = &usb_pcwd_fops,
576};
577
578static const struct file_operations usb_pcwd_temperature_fops = {
579 .owner = THIS_MODULE,
580 .llseek = no_llseek,
581 .read = usb_pcwd_temperature_read,
582 .open = usb_pcwd_temperature_open,
583 .release = usb_pcwd_temperature_release,
584};
585
586static struct miscdevice usb_pcwd_temperature_miscdev = {
587 .minor = TEMP_MINOR,
588 .name = "temperature",
589 .fops = &usb_pcwd_temperature_fops,
590};
591
592static struct notifier_block usb_pcwd_notifier = {
593 .notifier_call = usb_pcwd_notify_sys,
594};
595
596
597
598
599static inline void usb_pcwd_delete(struct usb_pcwd_private *usb_pcwd)
600{
601 usb_free_urb(usb_pcwd->intr_urb);
602 if (usb_pcwd->intr_buffer != NULL)
603 usb_buffer_free(usb_pcwd->udev, usb_pcwd->intr_size,
604 usb_pcwd->intr_buffer, usb_pcwd->intr_dma);
605 kfree(usb_pcwd);
606}
607
608
609
610
611
612
613
614static int usb_pcwd_probe(struct usb_interface *interface,
615 const struct usb_device_id *id)
616{
617 struct usb_device *udev = interface_to_usbdev(interface);
618 struct usb_host_interface *iface_desc;
619 struct usb_endpoint_descriptor *endpoint;
620 struct usb_pcwd_private *usb_pcwd = NULL;
621 int pipe, maxp;
622 int retval = -ENOMEM;
623 int got_fw_rev;
624 unsigned char fw_rev_major, fw_rev_minor;
625 char fw_ver_str[20];
626 unsigned char option_switches, dummy;
627
628 cards_found++;
629 if (cards_found > 1) {
630 printk(KERN_ERR PFX "This driver only supports 1 device\n");
631 return -ENODEV;
632 }
633
634
635 iface_desc = interface->cur_altsetting;
636
637
638 if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) {
639 printk(KERN_ERR PFX
640 "The device isn't a Human Interface Device\n");
641 return -ENODEV;
642 }
643
644
645 endpoint = &iface_desc->endpoint[0].desc;
646
647 if (!usb_endpoint_is_int_in(endpoint)) {
648
649 printk(KERN_ERR PFX "Couldn't find an INTR & IN endpoint\n");
650 return -ENODEV;
651 }
652
653
654 pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
655 maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
656
657
658 usb_pcwd = kzalloc(sizeof(struct usb_pcwd_private), GFP_KERNEL);
659 if (usb_pcwd == NULL) {
660 printk(KERN_ERR PFX "Out of memory\n");
661 goto error;
662 }
663
664 usb_pcwd_device = usb_pcwd;
665
666 mutex_init(&usb_pcwd->mtx);
667 usb_pcwd->udev = udev;
668 usb_pcwd->interface = interface;
669 usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber;
670 usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ?
671 le16_to_cpu(endpoint->wMaxPacketSize) : 8);
672
673
674 usb_pcwd->intr_buffer = usb_buffer_alloc(udev, usb_pcwd->intr_size,
675 GFP_ATOMIC, &usb_pcwd->intr_dma);
676 if (!usb_pcwd->intr_buffer) {
677 printk(KERN_ERR PFX "Out of memory\n");
678 goto error;
679 }
680
681
682 usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
683 if (!usb_pcwd->intr_urb) {
684 printk(KERN_ERR PFX "Out of memory\n");
685 goto error;
686 }
687
688
689 usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe,
690 usb_pcwd->intr_buffer, usb_pcwd->intr_size,
691 usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval);
692 usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma;
693 usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
694
695
696 if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) {
697 printk(KERN_ERR PFX "Problem registering interrupt URB\n");
698 retval = -EIO;
699 goto error;
700 }
701
702
703 usb_pcwd->exists = 1;
704
705
706 usb_pcwd_stop(usb_pcwd);
707
708
709 got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION,
710 &fw_rev_major, &fw_rev_minor);
711 if (got_fw_rev)
712 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
713 else
714 sprintf(fw_ver_str, "<card no answer>");
715
716 printk(KERN_INFO PFX "Found card (Firmware: %s) with temp option\n",
717 fw_ver_str);
718
719
720 usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy,
721 &option_switches);
722
723 printk(KERN_INFO PFX "Option switches (0x%02x): "
724 "Temperature Reset Enable=%s, Power On Delay=%s\n",
725 option_switches,
726 ((option_switches & 0x10) ? "ON" : "OFF"),
727 ((option_switches & 0x08) ? "ON" : "OFF"));
728
729
730 if (heartbeat == 0)
731 heartbeat = heartbeat_tbl[(option_switches & 0x07)];
732
733
734
735 if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) {
736 usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT);
737 printk(KERN_INFO PFX
738 "heartbeat value must be 0<heartbeat<65536, using %d\n",
739 WATCHDOG_HEARTBEAT);
740 }
741
742 retval = register_reboot_notifier(&usb_pcwd_notifier);
743 if (retval != 0) {
744 printk(KERN_ERR PFX
745 "cannot register reboot notifier (err=%d)\n",
746 retval);
747 goto error;
748 }
749
750 retval = misc_register(&usb_pcwd_temperature_miscdev);
751 if (retval != 0) {
752 printk(KERN_ERR PFX
753 "cannot register miscdev on minor=%d (err=%d)\n",
754 TEMP_MINOR, retval);
755 goto err_out_unregister_reboot;
756 }
757
758 retval = misc_register(&usb_pcwd_miscdev);
759 if (retval != 0) {
760 printk(KERN_ERR PFX
761 "cannot register miscdev on minor=%d (err=%d)\n",
762 WATCHDOG_MINOR, retval);
763 goto err_out_misc_deregister;
764 }
765
766
767 usb_set_intfdata(interface, usb_pcwd);
768
769 printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
770 heartbeat, nowayout);
771
772 return 0;
773
774err_out_misc_deregister:
775 misc_deregister(&usb_pcwd_temperature_miscdev);
776err_out_unregister_reboot:
777 unregister_reboot_notifier(&usb_pcwd_notifier);
778error:
779 if (usb_pcwd)
780 usb_pcwd_delete(usb_pcwd);
781 usb_pcwd_device = NULL;
782 return retval;
783}
784
785
786
787
788
789
790
791
792
793
794static void usb_pcwd_disconnect(struct usb_interface *interface)
795{
796 struct usb_pcwd_private *usb_pcwd;
797
798
799 mutex_lock(&disconnect_mutex);
800
801 usb_pcwd = usb_get_intfdata(interface);
802 usb_set_intfdata(interface, NULL);
803
804 mutex_lock(&usb_pcwd->mtx);
805
806
807 if (!nowayout)
808 usb_pcwd_stop(usb_pcwd);
809
810
811 usb_pcwd->exists = 0;
812
813
814 misc_deregister(&usb_pcwd_miscdev);
815 misc_deregister(&usb_pcwd_temperature_miscdev);
816 unregister_reboot_notifier(&usb_pcwd_notifier);
817
818 mutex_unlock(&usb_pcwd->mtx);
819
820
821 usb_pcwd_delete(usb_pcwd);
822
823 cards_found--;
824
825 mutex_unlock(&disconnect_mutex);
826
827 printk(KERN_INFO PFX "USB PC Watchdog disconnected\n");
828}
829
830
831
832
833
834
835static int __init usb_pcwd_init(void)
836{
837 int result;
838
839
840 result = usb_register(&usb_pcwd_driver);
841 if (result) {
842 printk(KERN_ERR PFX "usb_register failed. Error number %d\n",
843 result);
844 return result;
845 }
846
847 printk(KERN_INFO PFX DRIVER_DESC " v" DRIVER_VERSION "\n");
848 return 0;
849}
850
851
852
853
854
855static void __exit usb_pcwd_exit(void)
856{
857
858 usb_deregister(&usb_pcwd_driver);
859}
860
861
862module_init(usb_pcwd_init);
863module_exit(usb_pcwd_exit);
864