2 * Berkshire USB-PC Watchdog Card Driver
4 * (c) Copyright 2004-2007 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@lxorguk.ukuu.org.uk>,
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/module.h> /* For module specific items */
28 #include <linux/moduleparam.h> /* For new moduleparam's */
29 #include <linux/types.h> /* For standard types (like size_t) */
30 #include <linux/errno.h> /* For the -ENODEV/... values */
31 #include <linux/kernel.h> /* For printk/panic/... */
32 #include <linux/delay.h> /* For mdelay function */
33 #include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */
34 #include <linux/watchdog.h> /* For the watchdog specific items */
35 #include <linux/notifier.h> /* For notifier support */
36 #include <linux/reboot.h> /* For reboot_notifier stuff */
37 #include <linux/init.h> /* For __init/__exit/... */
38 #include <linux/fs.h> /* For file operations */
39 #include <linux/usb.h> /* For USB functions */
40 #include <linux/slab.h> /* For kmalloc, ... */
41 #include <linux/mutex.h> /* For mutex locking */
42 #include <linux/hid.h> /* For HID_REQ_SET_REPORT & HID_DT_REPORT */
43 #include <linux/uaccess.h> /* For copy_to_user/put_user/... */
46 #ifdef CONFIG_USB_DEBUG
52 /* Use our own dbg macro */
54 #define dbg(format, arg...) \
55 do { if (debug) printk(KERN_DEBUG PFX format "\n" , ## arg); } while (0)
57 /* Module and Version Information */
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 ": "
65 MODULE_AUTHOR(DRIVER_AUTHOR
);
66 MODULE_DESCRIPTION(DRIVER_DESC
);
67 MODULE_LICENSE(DRIVER_LICENSE
);
68 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR
);
69 MODULE_ALIAS_MISCDEV(TEMP_MINOR
);
71 /* Module Parameters */
72 module_param(debug
, int, 0);
73 MODULE_PARM_DESC(debug
, "Debug enabled or not");
75 #define WATCHDOG_HEARTBEAT 0 /* default heartbeat =
76 delay-time from dip-switches */
77 static int heartbeat
= WATCHDOG_HEARTBEAT
;
78 module_param(heartbeat
, int, 0);
79 MODULE_PARM_DESC(heartbeat
, "Watchdog heartbeat in seconds. "
80 "(0<heartbeat<65536 or 0=delay-time from dip-switches, default="
81 __MODULE_STRING(WATCHDOG_HEARTBEAT
) ")");
83 static int nowayout
= WATCHDOG_NOWAYOUT
;
84 module_param(nowayout
, int, 0);
85 MODULE_PARM_DESC(nowayout
, "Watchdog cannot be stopped once started (default="
86 __MODULE_STRING(WATCHDOG_NOWAYOUT
) ")");
88 /* The vendor and product id's for the USB-PC Watchdog card */
89 #define USB_PCWD_VENDOR_ID 0x0c98
90 #define USB_PCWD_PRODUCT_ID 0x1140
92 /* table of devices that work with this driver */
93 static struct usb_device_id usb_pcwd_table
[] = {
94 { USB_DEVICE(USB_PCWD_VENDOR_ID
, USB_PCWD_PRODUCT_ID
) },
95 { } /* Terminating entry */
97 MODULE_DEVICE_TABLE(usb
, usb_pcwd_table
);
99 /* according to documentation max. time to process a command for the USB
100 * watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */
101 #define USB_COMMAND_TIMEOUT 250
103 /* Watchdog's internal commands */
104 #define CMD_READ_TEMP 0x02 /* Read Temperature;
105 Re-trigger Watchdog */
106 #define CMD_TRIGGER CMD_READ_TEMP
107 #define CMD_GET_STATUS 0x04 /* Get Status Information */
108 #define CMD_GET_FIRMWARE_VERSION 0x08 /* Get Firmware Version */
109 #define CMD_GET_DIP_SWITCH_SETTINGS 0x0c /* Get Dip Switch Settings */
110 #define CMD_READ_WATCHDOG_TIMEOUT 0x18 /* Read Current Watchdog Time */
111 #define CMD_WRITE_WATCHDOG_TIMEOUT 0x19 /* Write Current WatchdogTime */
112 #define CMD_ENABLE_WATCHDOG 0x30 /* Enable / Disable Watchdog */
113 #define CMD_DISABLE_WATCHDOG CMD_ENABLE_WATCHDOG
115 /* Watchdog's Dip Switch heartbeat values */
116 static const int heartbeat_tbl
[] = {
117 5, /* OFF-OFF-OFF = 5 Sec */
118 10, /* OFF-OFF-ON = 10 Sec */
119 30, /* OFF-ON-OFF = 30 Sec */
120 60, /* OFF-ON-ON = 1 Min */
121 300, /* ON-OFF-OFF = 5 Min */
122 600, /* ON-OFF-ON = 10 Min */
123 1800, /* ON-ON-OFF = 30 Min */
124 3600, /* ON-ON-ON = 1 hour */
127 /* We can only use 1 card due to the /dev/watchdog restriction */
128 static int cards_found
;
130 /* some internal variables */
131 static unsigned long is_active
;
132 static char expect_release
;
134 /* Structure to hold all of our device specific stuff */
135 struct usb_pcwd_private
{
136 /* save off the usb device pointer */
137 struct usb_device
*udev
;
138 /* the interface for this device */
139 struct usb_interface
*interface
;
141 /* the interface number used for cmd's */
142 unsigned int interface_number
;
144 /* the buffer to intr data */
145 unsigned char *intr_buffer
;
146 /* the dma address for the intr buffer */
148 /* the size of the intr buffer */
150 /* the urb used for the intr pipe */
151 struct urb
*intr_urb
;
153 /* The command that is reported back */
154 unsigned char cmd_command
;
155 /* The data MSB that is reported back */
156 unsigned char cmd_data_msb
;
157 /* The data LSB that is reported back */
158 unsigned char cmd_data_lsb
;
159 /* true if we received a report after a command */
160 atomic_t cmd_received
;
162 /* Wether or not the device exists */
164 /* locks this structure */
167 static struct usb_pcwd_private
*usb_pcwd_device
;
169 /* prevent races between open() and disconnect() */
170 static DEFINE_MUTEX(disconnect_mutex
);
172 /* local function prototypes */
173 static int usb_pcwd_probe(struct usb_interface
*interface
,
174 const struct usb_device_id
*id
);
175 static void usb_pcwd_disconnect(struct usb_interface
*interface
);
177 /* usb specific object needed to register this driver with the usb subsystem */
178 static struct usb_driver usb_pcwd_driver
= {
180 .probe
= usb_pcwd_probe
,
181 .disconnect
= usb_pcwd_disconnect
,
182 .id_table
= usb_pcwd_table
,
186 static void usb_pcwd_intr_done(struct urb
*urb
)
188 struct usb_pcwd_private
*usb_pcwd
=
189 (struct usb_pcwd_private
*)urb
->context
;
190 unsigned char *data
= usb_pcwd
->intr_buffer
;
193 switch (urb
->status
) {
194 case 0: /* success */
196 case -ECONNRESET
: /* unlink */
199 /* this urb is terminated, clean up */
200 dbg("%s - urb shutting down with status: %d", __func__
,
203 /* -EPIPE: should clear the halt */
205 dbg("%s - nonzero urb status received: %d", __func__
,
210 dbg("received following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
211 data
[0], data
[1], data
[2]);
213 usb_pcwd
->cmd_command
= data
[0];
214 usb_pcwd
->cmd_data_msb
= data
[1];
215 usb_pcwd
->cmd_data_lsb
= data
[2];
217 /* notify anyone waiting that the cmd has finished */
218 atomic_set(&usb_pcwd
->cmd_received
, 1);
221 retval
= usb_submit_urb(urb
, GFP_ATOMIC
);
223 printk(KERN_ERR PFX
"can't resubmit intr, "
224 "usb_submit_urb failed with result %d\n", retval
);
227 static int usb_pcwd_send_command(struct usb_pcwd_private
*usb_pcwd
,
228 unsigned char cmd
, unsigned char *msb
, unsigned char *lsb
)
230 int got_response
, count
;
231 unsigned char buf
[6];
233 /* We will not send any commands if the USB PCWD device does
235 if ((!usb_pcwd
) || (!usb_pcwd
->exists
))
238 /* The USB PC Watchdog uses a 6 byte report format.
239 * The board currently uses only 3 of the six bytes of the report. */
240 buf
[0] = cmd
; /* Byte 0 = CMD */
241 buf
[1] = *msb
; /* Byte 1 = Data MSB */
242 buf
[2] = *lsb
; /* Byte 2 = Data LSB */
243 buf
[3] = buf
[4] = buf
[5] = 0; /* All other bytes not used */
245 dbg("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
246 buf
[0], buf
[1], buf
[2]);
248 atomic_set(&usb_pcwd
->cmd_received
, 0);
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
);
257 /* wait till the usb card processed the command,
258 * with a max. timeout of USB_COMMAND_TIMEOUT */
260 for (count
= 0; (count
< USB_COMMAND_TIMEOUT
) && (!got_response
);
263 if (atomic_read(&usb_pcwd
->cmd_received
))
267 if ((got_response
) && (cmd
== usb_pcwd
->cmd_command
)) {
268 /* read back response */
269 *msb
= usb_pcwd
->cmd_data_msb
;
270 *lsb
= usb_pcwd
->cmd_data_lsb
;
276 static int usb_pcwd_start(struct usb_pcwd_private
*usb_pcwd
)
278 unsigned char msb
= 0x00;
279 unsigned char lsb
= 0x00;
282 /* Enable Watchdog */
283 retval
= usb_pcwd_send_command(usb_pcwd
, CMD_ENABLE_WATCHDOG
,
286 if ((retval
== 0) || (lsb
== 0)) {
288 "Card did not acknowledge enable attempt\n");
295 static int usb_pcwd_stop(struct usb_pcwd_private
*usb_pcwd
)
297 unsigned char msb
= 0xA5;
298 unsigned char lsb
= 0xC3;
301 /* Disable Watchdog */
302 retval
= usb_pcwd_send_command(usb_pcwd
, CMD_DISABLE_WATCHDOG
,
305 if ((retval
== 0) || (lsb
!= 0)) {
307 "Card did not acknowledge disable attempt\n");
314 static int usb_pcwd_keepalive(struct usb_pcwd_private
*usb_pcwd
)
318 /* Re-trigger Watchdog */
319 usb_pcwd_send_command(usb_pcwd
, CMD_TRIGGER
, &dummy
, &dummy
);
324 static int usb_pcwd_set_heartbeat(struct usb_pcwd_private
*usb_pcwd
, int t
)
326 unsigned char msb
= t
/ 256;
327 unsigned char lsb
= t
% 256;
329 if ((t
< 0x0001) || (t
> 0xFFFF))
332 /* Write new heartbeat to watchdog */
333 usb_pcwd_send_command(usb_pcwd
, CMD_WRITE_WATCHDOG_TIMEOUT
, &msb
, &lsb
);
339 static int usb_pcwd_get_temperature(struct usb_pcwd_private
*usb_pcwd
,
342 unsigned char msb
, lsb
;
344 usb_pcwd_send_command(usb_pcwd
, CMD_READ_TEMP
, &msb
, &lsb
);
347 * Convert celsius to fahrenheit, since this was
348 * the decided 'standard' for this return value.
350 *temperature
= (lsb
* 9 / 5) + 32;
355 static int usb_pcwd_get_timeleft(struct usb_pcwd_private
*usb_pcwd
,
358 unsigned char msb
, lsb
;
360 /* Read the time that's left before rebooting */
361 /* Note: if the board is not yet armed then we will read 0xFFFF */
362 usb_pcwd_send_command(usb_pcwd
, CMD_READ_WATCHDOG_TIMEOUT
, &msb
, &lsb
);
364 *time_left
= (msb
<< 8) + lsb
;
370 * /dev/watchdog handling
373 static ssize_t
usb_pcwd_write(struct file
*file
, const char __user
*data
,
374 size_t len
, loff_t
*ppos
)
376 /* See if we got the magic character 'V' and reload the timer */
381 /* note: just in case someone wrote the magic character
382 * five months ago... */
385 /* scan to see whether or not we got the
387 for (i
= 0; i
!= len
; i
++) {
389 if (get_user(c
, data
+ i
))
396 /* someone wrote to us, we should reload the timer */
397 usb_pcwd_keepalive(usb_pcwd_device
);
402 static long usb_pcwd_ioctl(struct file
*file
, unsigned int cmd
,
405 void __user
*argp
= (void __user
*)arg
;
406 int __user
*p
= argp
;
407 static const struct watchdog_info ident
= {
408 .options
= WDIOF_KEEPALIVEPING
|
411 .firmware_version
= 1,
412 .identity
= DRIVER_NAME
,
416 case WDIOC_GETSUPPORT
:
417 return copy_to_user(argp
, &ident
, sizeof(ident
)) ? -EFAULT
: 0;
419 case WDIOC_GETSTATUS
:
420 case WDIOC_GETBOOTSTATUS
:
421 return put_user(0, p
);
427 if (usb_pcwd_get_temperature(usb_pcwd_device
, &temperature
))
430 return put_user(temperature
, p
);
433 case WDIOC_SETOPTIONS
:
435 int new_options
, retval
= -EINVAL
;
437 if (get_user(new_options
, p
))
440 if (new_options
& WDIOS_DISABLECARD
) {
441 usb_pcwd_stop(usb_pcwd_device
);
445 if (new_options
& WDIOS_ENABLECARD
) {
446 usb_pcwd_start(usb_pcwd_device
);
453 case WDIOC_KEEPALIVE
:
454 usb_pcwd_keepalive(usb_pcwd_device
);
457 case WDIOC_SETTIMEOUT
:
461 if (get_user(new_heartbeat
, p
))
464 if (usb_pcwd_set_heartbeat(usb_pcwd_device
, new_heartbeat
))
467 usb_pcwd_keepalive(usb_pcwd_device
);
471 case WDIOC_GETTIMEOUT
:
472 return put_user(heartbeat
, p
);
474 case WDIOC_GETTIMELEFT
:
478 if (usb_pcwd_get_timeleft(usb_pcwd_device
, &time_left
))
481 return put_user(time_left
, p
);
489 static int usb_pcwd_open(struct inode
*inode
, struct file
*file
)
491 /* /dev/watchdog can only be opened once */
492 if (test_and_set_bit(0, &is_active
))
496 usb_pcwd_start(usb_pcwd_device
);
497 usb_pcwd_keepalive(usb_pcwd_device
);
498 return nonseekable_open(inode
, file
);
501 static int usb_pcwd_release(struct inode
*inode
, struct file
*file
)
504 * Shut off the timer.
506 if (expect_release
== 42) {
507 usb_pcwd_stop(usb_pcwd_device
);
510 "Unexpected close, not stopping watchdog!\n");
511 usb_pcwd_keepalive(usb_pcwd_device
);
514 clear_bit(0, &is_active
);
519 * /dev/temperature handling
522 static ssize_t
usb_pcwd_temperature_read(struct file
*file
, char __user
*data
,
523 size_t len
, loff_t
*ppos
)
527 if (usb_pcwd_get_temperature(usb_pcwd_device
, &temperature
))
530 if (copy_to_user(data
, &temperature
, 1))
536 static int usb_pcwd_temperature_open(struct inode
*inode
, struct file
*file
)
538 return nonseekable_open(inode
, file
);
541 static int usb_pcwd_temperature_release(struct inode
*inode
, struct file
*file
)
550 static int usb_pcwd_notify_sys(struct notifier_block
*this, unsigned long code
,
553 if (code
== SYS_DOWN
|| code
== SYS_HALT
)
554 usb_pcwd_stop(usb_pcwd_device
); /* Turn the WDT off */
563 static const struct file_operations usb_pcwd_fops
= {
564 .owner
= THIS_MODULE
,
566 .write
= usb_pcwd_write
,
567 .unlocked_ioctl
= usb_pcwd_ioctl
,
568 .open
= usb_pcwd_open
,
569 .release
= usb_pcwd_release
,
572 static struct miscdevice usb_pcwd_miscdev
= {
573 .minor
= WATCHDOG_MINOR
,
575 .fops
= &usb_pcwd_fops
,
578 static const struct file_operations usb_pcwd_temperature_fops
= {
579 .owner
= THIS_MODULE
,
581 .read
= usb_pcwd_temperature_read
,
582 .open
= usb_pcwd_temperature_open
,
583 .release
= usb_pcwd_temperature_release
,
586 static struct miscdevice usb_pcwd_temperature_miscdev
= {
588 .name
= "temperature",
589 .fops
= &usb_pcwd_temperature_fops
,
592 static struct notifier_block usb_pcwd_notifier
= {
593 .notifier_call
= usb_pcwd_notify_sys
,
599 static inline void usb_pcwd_delete(struct usb_pcwd_private
*usb_pcwd
)
601 usb_free_urb(usb_pcwd
->intr_urb
);
602 if (usb_pcwd
->intr_buffer
!= NULL
)
603 usb_free_coherent(usb_pcwd
->udev
, usb_pcwd
->intr_size
,
604 usb_pcwd
->intr_buffer
, usb_pcwd
->intr_dma
);
611 * Called by the usb core when a new device is connected that it thinks
612 * this driver might be interested in.
614 static int usb_pcwd_probe(struct usb_interface
*interface
,
615 const struct usb_device_id
*id
)
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
;
622 int retval
= -ENOMEM
;
624 unsigned char fw_rev_major
, fw_rev_minor
;
626 unsigned char option_switches
, dummy
;
629 if (cards_found
> 1) {
630 printk(KERN_ERR PFX
"This driver only supports 1 device\n");
634 /* get the active interface descriptor */
635 iface_desc
= interface
->cur_altsetting
;
637 /* check out that we have a HID device */
638 if (!(iface_desc
->desc
.bInterfaceClass
== USB_CLASS_HID
)) {
640 "The device isn't a Human Interface Device\n");
644 /* check out the endpoint: it has to be Interrupt & IN */
645 endpoint
= &iface_desc
->endpoint
[0].desc
;
647 if (!usb_endpoint_is_int_in(endpoint
)) {
648 /* we didn't find a Interrupt endpoint with direction IN */
649 printk(KERN_ERR PFX
"Couldn't find an INTR & IN endpoint\n");
653 /* get a handle to the interrupt data pipe */
654 pipe
= usb_rcvintpipe(udev
, endpoint
->bEndpointAddress
);
655 maxp
= usb_maxpacket(udev
, pipe
, usb_pipeout(pipe
));
657 /* allocate memory for our device and initialize it */
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");
664 usb_pcwd_device
= usb_pcwd
;
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);
673 /* set up the memory buffer's */
674 usb_pcwd
->intr_buffer
= usb_alloc_coherent(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");
681 /* allocate the urb's */
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");
688 /* initialise the intr urb's */
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
;
695 /* register our interrupt URB with the USB system */
696 if (usb_submit_urb(usb_pcwd
->intr_urb
, GFP_KERNEL
)) {
697 printk(KERN_ERR PFX
"Problem registering interrupt URB\n");
698 retval
= -EIO
; /* failure */
702 /* The device exists and can be communicated with */
703 usb_pcwd
->exists
= 1;
706 usb_pcwd_stop(usb_pcwd
);
708 /* Get the Firmware Version */
709 got_fw_rev
= usb_pcwd_send_command(usb_pcwd
, CMD_GET_FIRMWARE_VERSION
,
710 &fw_rev_major
, &fw_rev_minor
);
712 sprintf(fw_ver_str
, "%u.%02u", fw_rev_major
, fw_rev_minor
);
714 sprintf(fw_ver_str
, "<card no answer>");
716 printk(KERN_INFO PFX
"Found card (Firmware: %s) with temp option\n",
719 /* Get switch settings */
720 usb_pcwd_send_command(usb_pcwd
, CMD_GET_DIP_SWITCH_SETTINGS
, &dummy
,
723 printk(KERN_INFO PFX
"Option switches (0x%02x): "
724 "Temperature Reset Enable=%s, Power On Delay=%s\n",
726 ((option_switches
& 0x10) ? "ON" : "OFF"),
727 ((option_switches
& 0x08) ? "ON" : "OFF"));
729 /* If heartbeat = 0 then we use the heartbeat from the dip-switches */
731 heartbeat
= heartbeat_tbl
[(option_switches
& 0x07)];
733 /* Check that the heartbeat value is within it's range ;
734 * if not reset to the default */
735 if (usb_pcwd_set_heartbeat(usb_pcwd
, heartbeat
)) {
736 usb_pcwd_set_heartbeat(usb_pcwd
, WATCHDOG_HEARTBEAT
);
738 "heartbeat value must be 0<heartbeat<65536, using %d\n",
742 retval
= register_reboot_notifier(&usb_pcwd_notifier
);
745 "cannot register reboot notifier (err=%d)\n",
750 retval
= misc_register(&usb_pcwd_temperature_miscdev
);
753 "cannot register miscdev on minor=%d (err=%d)\n",
755 goto err_out_unregister_reboot
;
758 retval
= misc_register(&usb_pcwd_miscdev
);
761 "cannot register miscdev on minor=%d (err=%d)\n",
762 WATCHDOG_MINOR
, retval
);
763 goto err_out_misc_deregister
;
766 /* we can register the device now, as it is ready */
767 usb_set_intfdata(interface
, usb_pcwd
);
769 printk(KERN_INFO PFX
"initialized. heartbeat=%d sec (nowayout=%d)\n",
770 heartbeat
, nowayout
);
774 err_out_misc_deregister
:
775 misc_deregister(&usb_pcwd_temperature_miscdev
);
776 err_out_unregister_reboot
:
777 unregister_reboot_notifier(&usb_pcwd_notifier
);
780 usb_pcwd_delete(usb_pcwd
);
781 usb_pcwd_device
= NULL
;
787 * usb_pcwd_disconnect
789 * Called by the usb core when the device is removed from the system.
791 * This routine guarantees that the driver will not submit any more urbs
792 * by clearing dev->udev.
794 static void usb_pcwd_disconnect(struct usb_interface
*interface
)
796 struct usb_pcwd_private
*usb_pcwd
;
798 /* prevent races with open() */
799 mutex_lock(&disconnect_mutex
);
801 usb_pcwd
= usb_get_intfdata(interface
);
802 usb_set_intfdata(interface
, NULL
);
804 mutex_lock(&usb_pcwd
->mtx
);
806 /* Stop the timer before we leave */
808 usb_pcwd_stop(usb_pcwd
);
810 /* We should now stop communicating with the USB PCWD device */
811 usb_pcwd
->exists
= 0;
814 misc_deregister(&usb_pcwd_miscdev
);
815 misc_deregister(&usb_pcwd_temperature_miscdev
);
816 unregister_reboot_notifier(&usb_pcwd_notifier
);
818 mutex_unlock(&usb_pcwd
->mtx
);
820 /* Delete the USB PCWD device */
821 usb_pcwd_delete(usb_pcwd
);
825 mutex_unlock(&disconnect_mutex
);
827 printk(KERN_INFO PFX
"USB PC Watchdog disconnected\n");
835 static int __init
usb_pcwd_init(void)
839 /* register this driver with the USB subsystem */
840 result
= usb_register(&usb_pcwd_driver
);
842 printk(KERN_ERR PFX
"usb_register failed. Error number %d\n",
847 printk(KERN_INFO PFX DRIVER_DESC
" v" DRIVER_VERSION
"\n");
855 static void __exit
usb_pcwd_exit(void)
857 /* deregister this driver with the USB subsystem */
858 usb_deregister(&usb_pcwd_driver
);
862 module_init(usb_pcwd_init
);
863 module_exit(usb_pcwd_exit
);