2 * Berkshire USB-PC Watchdog Card Driver
4 * (c) Copyright 2004 Wim Van Sebroeck <wim@iguana.be>.
6 * Based on source code of the following authors:
7 * Ken Hollis <kenji@bitgate.com>,
8 * Alan Cox <alan@redhat.com>,
9 * Matt Domsch <Matt_Domsch@dell.com>,
10 * Rob Radez <rob@osinvestor.com>,
11 * Greg Kroah-Hartman <greg@kroah.com>
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
18 * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
19 * provide warranty for any of this software. This material is
20 * provided "AS-IS" and at no charge.
22 * Thanks also to Simon Machell at Berkshire Products Inc. for
23 * providing the test hardware. More info is available at
24 * http://www.berkprod.com/ or http://www.pcwatchdog.com/
27 #include <linux/config.h>
28 #include <linux/kernel.h>
29 #include <linux/errno.h>
30 #include <linux/init.h>
31 #include <linux/slab.h>
32 #include <linux/module.h>
33 #include <linux/moduleparam.h>
34 #include <linux/types.h>
35 #include <linux/delay.h>
36 #include <linux/miscdevice.h>
37 #include <linux/watchdog.h>
38 #include <linux/notifier.h>
39 #include <linux/reboot.h>
41 #include <linux/smp_lock.h>
42 #include <linux/completion.h>
43 #include <asm/uaccess.h>
44 #include <linux/usb.h>
47 #ifdef CONFIG_USB_DEBUG
53 /* Use our own dbg macro */
55 #define dbg(format, arg...) do { if (debug) printk(KERN_DEBUG PFX format "\n" , ## arg); } while (0)
58 /* Module and Version Information */
59 #define DRIVER_VERSION "1.00"
60 #define DRIVER_DATE "12 Jun 2004"
61 #define DRIVER_AUTHOR "Wim Van Sebroeck <wim@iguana.be>"
62 #define DRIVER_DESC "Berkshire USB-PC Watchdog driver"
63 #define DRIVER_LICENSE "GPL"
64 #define DRIVER_NAME "pcwd_usb"
65 #define PFX DRIVER_NAME ": "
67 MODULE_AUTHOR(DRIVER_AUTHOR);
68 MODULE_DESCRIPTION(DRIVER_DESC);
69 MODULE_LICENSE(DRIVER_LICENSE);
70 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
71 MODULE_ALIAS_MISCDEV(TEMP_MINOR);
73 /* Module Parameters */
74 module_param(debug, int, 0);
75 MODULE_PARM_DESC(debug, "Debug enabled or not");
77 #define WATCHDOG_HEARTBEAT 2 /* 2 sec default heartbeat */
78 static int heartbeat = WATCHDOG_HEARTBEAT;
79 module_param(heartbeat, int, 0);
80 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
82 #ifdef CONFIG_WATCHDOG_NOWAYOUT
83 static int nowayout = 1;
85 static int nowayout = 0;
88 module_param(nowayout, int, 0);
89 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
91 /* The vendor and product id's for the USB-PC Watchdog card */
92 #define USB_PCWD_VENDOR_ID 0x0c98
93 #define USB_PCWD_PRODUCT_ID 0x1140
95 /* table of devices that work with this driver */
96 static struct usb_device_id usb_pcwd_table [] = {
97 { USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) },
98 { } /* Terminating entry */
100 MODULE_DEVICE_TABLE (usb, usb_pcwd_table);
102 /* according to documentation max. time to process a command for the USB
103 * watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */
104 #define USB_COMMAND_TIMEOUT 250
106 /* Watchdog's internal commands */
107 #define CMD_READ_TEMP 0x02 /* Read Temperature; Re-trigger Watchdog */
108 #define CMD_TRIGGER CMD_READ_TEMP
109 #define CMD_GET_STATUS 0x04 /* Get Status Information */
110 #define CMD_GET_FIRMWARE_VERSION 0x08 /* Get Firmware Version */
111 #define CMD_GET_DIP_SWITCH_SETTINGS 0x0c /* Get Dip Switch Settings */
112 #define CMD_READ_WATCHDOG_TIMEOUT 0x18 /* Read Current Watchdog Time */
113 #define CMD_WRITE_WATCHDOG_TIMEOUT 0x19 /* Write Current Watchdog Time */
114 #define CMD_ENABLE_WATCHDOG 0x30 /* Enable / Disable Watchdog */
115 #define CMD_DISABLE_WATCHDOG CMD_ENABLE_WATCHDOG
117 /* Some defines that I like to be somewhere else like include/linux/usb_hid.h */
118 #define HID_REQ_SET_REPORT 0x09
119 #define HID_DT_REPORT (USB_TYPE_CLASS | 0x02)
121 /* We can only use 1 card due to the /dev/watchdog restriction */
122 static int cards_found;
124 /* some internal variables */
125 static unsigned long is_active;
126 static char expect_release;
128 /* Structure to hold all of our device specific stuff */
129 struct usb_pcwd_private {
130 struct usb_device * udev; /* save off the usb device pointer */
131 struct usb_interface * interface; /* the interface for this device */
133 unsigned int interface_number; /* the interface number used for cmd's */
135 unsigned char * intr_buffer; /* the buffer to intr data */
136 dma_addr_t intr_dma; /* the dma address for the intr buffer */
137 size_t intr_size; /* the size of the intr buffer */
138 struct urb * intr_urb; /* the urb used for the intr pipe */
140 unsigned char cmd_command; /* The command that is reported back */
141 unsigned char cmd_data_msb; /* The data MSB that is reported back */
142 unsigned char cmd_data_lsb; /* The data LSB that is reported back */
143 atomic_t cmd_received; /* true if we received a report after a command */
145 int exists; /* Wether or not the device exists */
146 struct semaphore sem; /* locks this structure */
148 static struct usb_pcwd_private *usb_pcwd_device;
150 /* prevent races between open() and disconnect() */
151 static DECLARE_MUTEX (disconnect_sem);
153 /* local function prototypes */
154 static int usb_pcwd_probe (struct usb_interface *interface, const struct usb_device_id *id);
155 static void usb_pcwd_disconnect (struct usb_interface *interface);
157 /* usb specific object needed to register this driver with the usb subsystem */
158 static struct usb_driver usb_pcwd_driver = {
159 .owner = THIS_MODULE,
161 .probe = usb_pcwd_probe,
162 .disconnect = usb_pcwd_disconnect,
163 .id_table = usb_pcwd_table,
167 static void usb_pcwd_intr_done(struct urb *urb, struct pt_regs *regs)
169 struct usb_pcwd_private *usb_pcwd = (struct usb_pcwd_private *)urb->context;
170 unsigned char *data = usb_pcwd->intr_buffer;
173 switch (urb->status) {
174 case 0: /* success */
176 case -ECONNRESET: /* unlink */
179 /* this urb is terminated, clean up */
180 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
182 /* -EPIPE: should clear the halt */
184 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
188 dbg("received following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
189 data[0], data[1], data[2]);
191 usb_pcwd->cmd_command = data[0];
192 usb_pcwd->cmd_data_msb = data[1];
193 usb_pcwd->cmd_data_lsb = data[2];
195 /* notify anyone waiting that the cmd has finished */
196 atomic_set (&usb_pcwd->cmd_received, 1);
199 retval = usb_submit_urb (urb, GFP_ATOMIC);
201 printk(KERN_ERR PFX "can't resubmit intr, usb_submit_urb failed with result %d\n",
205 static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd, unsigned char cmd,
206 unsigned char *msb, unsigned char *lsb)
208 int got_response, count;
209 unsigned char buf[6];
211 /* We will not send any commands if the USB PCWD device does not exist */
212 if ((!usb_pcwd) || (!usb_pcwd->exists))
215 /* The USB PC Watchdog uses a 6 byte report format. The board currently uses
216 * only 3 of the six bytes of the report. */
217 buf[0] = cmd; /* Byte 0 = CMD */
218 buf[1] = *msb; /* Byte 1 = Data MSB */
219 buf[2] = *lsb; /* Byte 2 = Data LSB */
220 buf[3] = buf[4] = buf[5] = 0; /* All other bytes not used */
222 dbg("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
223 buf[0], buf[1], buf[2]);
225 atomic_set (&usb_pcwd->cmd_received, 0);
227 if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0),
228 HID_REQ_SET_REPORT, HID_DT_REPORT,
229 0x0200, usb_pcwd->interface_number, buf, sizeof(buf),
230 HZ) != sizeof(buf)) {
231 dbg("usb_pcwd_send_command: error in usb_control_msg for cmd 0x%x 0x%x 0x%x\n", cmd, *msb, *lsb);
233 /* wait till the usb card processed the command,
234 * with a max. timeout of USB_COMMAND_TIMEOUT */
236 for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response); count++) {
238 if (atomic_read (&usb_pcwd->cmd_received))
242 if ((got_response) && (cmd == usb_pcwd->cmd_command)) {
243 /* read back response */
244 *msb = usb_pcwd->cmd_data_msb;
245 *lsb = usb_pcwd->cmd_data_lsb;
251 static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd)
253 unsigned char msb = 0x00;
254 unsigned char lsb = 0x00;
257 /* Enable Watchdog */
258 retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG, &msb, &lsb);
260 if ((retval == 0) || (lsb == 0)) {
261 printk(KERN_ERR PFX "Card did not acknowledge enable attempt\n");
268 static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd)
270 unsigned char msb = 0xA5;
271 unsigned char lsb = 0xC3;
274 /* Disable Watchdog */
275 retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG, &msb, &lsb);
277 if ((retval == 0) || (lsb != 0)) {
278 printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n");
285 static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd)
289 /* Re-trigger Watchdog */
290 usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy);
295 static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t)
297 unsigned char msb = t / 256;
298 unsigned char lsb = t % 256;
300 if ((t < 0x0001) || (t > 0xFFFF))
303 /* Write new heartbeat to watchdog */
304 usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb);
310 static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd, int *temperature)
312 unsigned char msb, lsb;
314 usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb);
317 * Convert celsius to fahrenheit, since this was
318 * the decided 'standard' for this return value.
320 *temperature = (lsb * 9 / 5) + 32;
326 * /dev/watchdog handling
329 static ssize_t usb_pcwd_write(struct file *file, const char *data,
330 size_t len, loff_t *ppos)
332 /* Can't seek (pwrite) on this device */
333 if (ppos != &file->f_pos)
336 /* See if we got the magic character 'V' and reload the timer */
341 /* note: just in case someone wrote the magic character
342 * five months ago... */
345 /* scan to see whether or not we got the magic character */
346 for (i = 0; i != len; i++) {
348 if(get_user(c, data+i))
355 /* someone wrote to us, we should reload the timer */
356 usb_pcwd_keepalive(usb_pcwd_device);
361 static int usb_pcwd_ioctl(struct inode *inode, struct file *file,
362 unsigned int cmd, unsigned long arg)
364 static struct watchdog_info ident = {
365 .options = WDIOF_KEEPALIVEPING |
368 .firmware_version = 1,
369 .identity = DRIVER_NAME,
373 case WDIOC_GETSUPPORT:
374 return copy_to_user((struct watchdog_info *) arg, &ident,
375 sizeof (ident)) ? -EFAULT : 0;
377 case WDIOC_GETSTATUS:
378 case WDIOC_GETBOOTSTATUS:
379 return put_user(0, (int *) arg);
385 if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
388 return put_user(temperature, (int *) arg);
391 case WDIOC_KEEPALIVE:
392 usb_pcwd_keepalive(usb_pcwd_device);
395 case WDIOC_SETOPTIONS:
397 int new_options, retval = -EINVAL;
399 if (get_user (new_options, (int *) arg))
402 if (new_options & WDIOS_DISABLECARD) {
403 usb_pcwd_stop(usb_pcwd_device);
407 if (new_options & WDIOS_ENABLECARD) {
408 usb_pcwd_start(usb_pcwd_device);
415 case WDIOC_SETTIMEOUT:
419 if (get_user(new_heartbeat, (int *) arg))
422 if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat))
425 usb_pcwd_keepalive(usb_pcwd_device);
429 case WDIOC_GETTIMEOUT:
430 return put_user(heartbeat, (int *)arg);
437 static int usb_pcwd_open(struct inode *inode, struct file *file)
439 /* /dev/watchdog can only be opened once */
440 if (test_and_set_bit(0, &is_active))
444 usb_pcwd_start(usb_pcwd_device);
445 usb_pcwd_keepalive(usb_pcwd_device);
449 static int usb_pcwd_release(struct inode *inode, struct file *file)
452 * Shut off the timer.
454 if (expect_release == 42) {
455 usb_pcwd_stop(usb_pcwd_device);
457 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
458 usb_pcwd_keepalive(usb_pcwd_device);
461 clear_bit(0, &is_active);
466 * /dev/temperature handling
469 static ssize_t usb_pcwd_temperature_read(struct file *file, char *data,
470 size_t len, loff_t *ppos)
474 /* Can't seek (pwrite) on this device */
475 if (ppos != &file->f_pos)
478 if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
481 if (copy_to_user (data, &temperature, 1))
487 static int usb_pcwd_temperature_open(struct inode *inode, struct file *file)
492 static int usb_pcwd_temperature_release(struct inode *inode, struct file *file)
501 static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
503 if (code==SYS_DOWN || code==SYS_HALT) {
504 /* Turn the WDT off */
505 usb_pcwd_stop(usb_pcwd_device);
515 static struct file_operations usb_pcwd_fops = {
516 .owner = THIS_MODULE,
518 .write = usb_pcwd_write,
519 .ioctl = usb_pcwd_ioctl,
520 .open = usb_pcwd_open,
521 .release = usb_pcwd_release,
524 static struct miscdevice usb_pcwd_miscdev = {
525 .minor = WATCHDOG_MINOR,
527 .fops = &usb_pcwd_fops,
530 static struct file_operations usb_pcwd_temperature_fops = {
531 .owner = THIS_MODULE,
533 .read = usb_pcwd_temperature_read,
534 .open = usb_pcwd_temperature_open,
535 .release = usb_pcwd_temperature_release,
538 static struct miscdevice usb_pcwd_temperature_miscdev = {
540 .name = "temperature",
541 .fops = &usb_pcwd_temperature_fops,
544 static struct notifier_block usb_pcwd_notifier = {
545 .notifier_call = usb_pcwd_notify_sys,
551 static inline void usb_pcwd_delete (struct usb_pcwd_private *usb_pcwd)
553 if (usb_pcwd->intr_urb != NULL)
554 usb_free_urb (usb_pcwd->intr_urb);
555 if (usb_pcwd->intr_buffer != NULL)
556 usb_buffer_free(usb_pcwd->udev, usb_pcwd->intr_size,
557 usb_pcwd->intr_buffer, usb_pcwd->intr_dma);
564 * Called by the usb core when a new device is connected that it thinks
565 * this driver might be interested in.
567 static int usb_pcwd_probe(struct usb_interface *interface, const struct usb_device_id *id)
569 struct usb_device *udev = interface_to_usbdev(interface);
570 struct usb_host_interface *iface_desc;
571 struct usb_endpoint_descriptor *endpoint;
572 struct usb_pcwd_private *usb_pcwd = NULL;
574 int retval = -ENOMEM;
576 unsigned char fw_rev_major, fw_rev_minor;
578 unsigned char option_switches, dummy;
580 /* See if the device offered us matches what we can accept */
581 if ((udev->descriptor.idVendor != USB_PCWD_VENDOR_ID) ||
582 (udev->descriptor.idProduct != USB_PCWD_PRODUCT_ID)) {
587 if (cards_found > 1) {
588 printk(KERN_ERR PFX "This driver only supports 1 device\n");
592 /* get the active interface descriptor */
593 iface_desc = interface->cur_altsetting;
595 /* check out that we have a HID device */
596 if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) {
597 printk(KERN_ERR PFX "The device isn't a Human Interface Device\n");
601 /* check out the endpoint: it has to be Interrupt & IN */
602 endpoint = &iface_desc->endpoint[0].desc;
604 if (!((endpoint->bEndpointAddress & USB_DIR_IN) &&
605 ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
606 == USB_ENDPOINT_XFER_INT))) {
607 /* we didn't find a Interrupt endpoint with direction IN */
608 printk(KERN_ERR PFX "Couldn't find an INTR & IN endpoint\n");
612 /* get a handle to the interrupt data pipe */
613 pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
614 maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
616 /* allocate memory for our device and initialize it */
617 usb_pcwd = kmalloc (sizeof(struct usb_pcwd_private), GFP_KERNEL);
618 if (usb_pcwd == NULL) {
619 printk(KERN_ERR PFX "Out of memory\n");
622 memset (usb_pcwd, 0x00, sizeof (*usb_pcwd));
624 usb_pcwd_device = usb_pcwd;
626 init_MUTEX (&usb_pcwd->sem);
627 usb_pcwd->udev = udev;
628 usb_pcwd->interface = interface;
629 usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber;
630 usb_pcwd->intr_size = (endpoint->wMaxPacketSize > 8 ? endpoint->wMaxPacketSize : 8);
632 /* set up the memory buffer's */
633 if (!(usb_pcwd->intr_buffer = usb_buffer_alloc(udev, usb_pcwd->intr_size, SLAB_ATOMIC, &usb_pcwd->intr_dma))) {
634 printk(KERN_ERR PFX "Out of memory\n");
638 /* allocate the urb's */
639 usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
640 if (!usb_pcwd->intr_urb) {
641 printk(KERN_ERR PFX "Out of memory\n");
645 /* initialise the intr urb's */
646 usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe,
647 usb_pcwd->intr_buffer, usb_pcwd->intr_size,
648 usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval);
649 usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma;
650 usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
652 /* register our interrupt URB with the USB system */
653 if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) {
654 printk(KERN_ERR PFX "Problem registering interrupt URB\n");
655 retval = -EIO; /* failure */
659 /* The device exists and can be communicated with */
660 usb_pcwd->exists = 1;
663 usb_pcwd_stop(usb_pcwd);
665 /* Get the Firmware Version */
666 got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor);
668 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
670 sprintf(fw_ver_str, "<card no answer>");
673 printk(KERN_INFO PFX "Found card (Firmware: %s) with temp option\n",
676 /* Get switch settings */
677 usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy, &option_switches);
679 printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
681 ((option_switches & 0x10) ? "ON" : "OFF"),
682 ((option_switches & 0x08) ? "ON" : "OFF"));
684 /* Check that the heartbeat value is within it's range ; if not reset to the default */
685 if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) {
686 usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT);
687 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
691 retval = register_reboot_notifier(&usb_pcwd_notifier);
693 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
698 retval = misc_register(&usb_pcwd_temperature_miscdev);
700 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
702 goto err_out_unregister_reboot;
705 retval = misc_register(&usb_pcwd_miscdev);
707 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
708 WATCHDOG_MINOR, retval);
709 goto err_out_misc_deregister;
712 /* we can register the device now, as it is ready */
713 usb_set_intfdata (interface, usb_pcwd);
715 printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
716 heartbeat, nowayout);
720 err_out_misc_deregister:
721 misc_deregister(&usb_pcwd_temperature_miscdev);
722 err_out_unregister_reboot:
723 unregister_reboot_notifier(&usb_pcwd_notifier);
725 usb_pcwd_delete (usb_pcwd);
726 usb_pcwd_device = NULL;
732 * usb_pcwd_disconnect
734 * Called by the usb core when the device is removed from the system.
736 * This routine guarantees that the driver will not submit any more urbs
737 * by clearing dev->udev.
739 static void usb_pcwd_disconnect(struct usb_interface *interface)
741 struct usb_pcwd_private *usb_pcwd;
743 /* prevent races with open() */
744 down (&disconnect_sem);
746 usb_pcwd = usb_get_intfdata (interface);
747 usb_set_intfdata (interface, NULL);
749 down (&usb_pcwd->sem);
751 /* Stop the timer before we leave */
753 usb_pcwd_stop(usb_pcwd);
755 /* We should now stop communicating with the USB PCWD device */
756 usb_pcwd->exists = 0;
759 misc_deregister(&usb_pcwd_miscdev);
760 misc_deregister(&usb_pcwd_temperature_miscdev);
761 unregister_reboot_notifier(&usb_pcwd_notifier);
765 /* Delete the USB PCWD device */
766 usb_pcwd_delete(usb_pcwd);
770 up (&disconnect_sem);
772 printk(KERN_INFO PFX "USB PC Watchdog disconnected\n");
780 static int __init usb_pcwd_init(void)
784 /* register this driver with the USB subsystem */
785 result = usb_register(&usb_pcwd_driver);
787 printk(KERN_ERR PFX "usb_register failed. Error number %d\n",
792 printk(KERN_INFO PFX DRIVER_DESC " v" DRIVER_VERSION " (" DRIVER_DATE ")\n");
800 static void __exit usb_pcwd_exit(void)
802 /* deregister this driver with the USB subsystem */
803 usb_deregister(&usb_pcwd_driver);
807 module_init (usb_pcwd_init);
808 module_exit (usb_pcwd_exit);