1 /*
2 * Berkshire USB-PC Watchdog Card Driver
3 *
4 * (c) Copyright 2004 Wim Van Sebroeck <wim@iguana.be>.
5 *
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>
12 *
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.
17 *
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.
21 *
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/
25 */
26
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>
40 #include <linux/fs.h>
41 #include <linux/smp_lock.h>
42 #include <linux/completion.h>
43 #include <asm/uaccess.h>
44 #include <linux/usb.h>
45 #include <linux/mutex.h>
46
47
48 #ifdef CONFIG_USB_DEBUG
49 static int debug = 1;
50 #else
51 static int debug;
52 #endif
53
54 /* Use our own dbg macro */
55 #undef dbg
56 #define dbg(format, arg...) do { if (debug) printk(KERN_DEBUG PFX format "\n" , ## arg); } while (0)
57
58
59 /* Module and Version Information */
60 #define DRIVER_VERSION "1.01"
61 #define DRIVER_DATE "15 Mar 2005"
62 #define DRIVER_AUTHOR "Wim Van Sebroeck <wim@iguana.be>"
63 #define DRIVER_DESC "Berkshire USB-PC Watchdog driver"
64 #define DRIVER_LICENSE "GPL"
65 #define DRIVER_NAME "pcwd_usb"
66 #define PFX DRIVER_NAME ": "
67
68 MODULE_AUTHOR(DRIVER_AUTHOR);
69 MODULE_DESCRIPTION(DRIVER_DESC);
70 MODULE_LICENSE(DRIVER_LICENSE);
71 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
72 MODULE_ALIAS_MISCDEV(TEMP_MINOR);
73
74 /* Module Parameters */
75 module_param(debug, int, 0);
76 MODULE_PARM_DESC(debug, "Debug enabled or not");
77
78 #define WATCHDOG_HEARTBEAT 2 /* 2 sec default heartbeat */
79 static int heartbeat = WATCHDOG_HEARTBEAT;
80 module_param(heartbeat, int, 0);
81 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
82
83 static int nowayout = WATCHDOG_NOWAYOUT;
84 module_param(nowayout, int, 0);
85 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
86
87 /* The vendor and product id's for the USB-PC Watchdog card */
88 #define USB_PCWD_VENDOR_ID 0x0c98
89 #define USB_PCWD_PRODUCT_ID 0x1140
90
91 /* table of devices that work with this driver */
92 static struct usb_device_id usb_pcwd_table [] = {
93 { USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) },
94 { } /* Terminating entry */
95 };
96 MODULE_DEVICE_TABLE (usb, usb_pcwd_table);
97
98 /* according to documentation max. time to process a command for the USB
99 * watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */
100 #define USB_COMMAND_TIMEOUT 250
101
102 /* Watchdog's internal commands */
103 #define CMD_READ_TEMP 0x02 /* Read Temperature; Re-trigger Watchdog */
104 #define CMD_TRIGGER CMD_READ_TEMP
105 #define CMD_GET_STATUS 0x04 /* Get Status Information */
106 #define CMD_GET_FIRMWARE_VERSION 0x08 /* Get Firmware Version */
107 #define CMD_GET_DIP_SWITCH_SETTINGS 0x0c /* Get Dip Switch Settings */
108 #define CMD_READ_WATCHDOG_TIMEOUT 0x18 /* Read Current Watchdog Time */
109 #define CMD_WRITE_WATCHDOG_TIMEOUT 0x19 /* Write Current Watchdog Time */
110 #define CMD_ENABLE_WATCHDOG 0x30 /* Enable / Disable Watchdog */
111 #define CMD_DISABLE_WATCHDOG CMD_ENABLE_WATCHDOG
112
113 /* Some defines that I like to be somewhere else like include/linux/usb_hid.h */
114 #define HID_REQ_SET_REPORT 0x09
115 #define HID_DT_REPORT (USB_TYPE_CLASS | 0x02)
116
117 /* We can only use 1 card due to the /dev/watchdog restriction */
118 static int cards_found;
119
120 /* some internal variables */
121 static unsigned long is_active;
122 static char expect_release;
123
124 /* Structure to hold all of our device specific stuff */
125 struct usb_pcwd_private {
126 struct usb_device * udev; /* save off the usb device pointer */
127 struct usb_interface * interface; /* the interface for this device */
128
129 unsigned int interface_number; /* the interface number used for cmd's */
130
131 unsigned char * intr_buffer; /* the buffer to intr data */
132 dma_addr_t intr_dma; /* the dma address for the intr buffer */
133 size_t intr_size; /* the size of the intr buffer */
134 struct urb * intr_urb; /* the urb used for the intr pipe */
135
136 unsigned char cmd_command; /* The command that is reported back */
137 unsigned char cmd_data_msb; /* The data MSB that is reported back */
138 unsigned char cmd_data_lsb; /* The data LSB that is reported back */
139 atomic_t cmd_received; /* true if we received a report after a command */
140
141 int exists; /* Wether or not the device exists */
142 struct semaphore sem; /* locks this structure */
143 };
144 static struct usb_pcwd_private *usb_pcwd_device;
145
146 /* prevent races between open() and disconnect() */
147 static DEFINE_MUTEX(disconnect_mutex);
148
149 /* local function prototypes */
150 static int usb_pcwd_probe (struct usb_interface *interface, const struct usb_device_id *id);
151 static void usb_pcwd_disconnect (struct usb_interface *interface);
152
153 /* usb specific object needed to register this driver with the usb subsystem */
154 static struct usb_driver usb_pcwd_driver = {
155 .name = DRIVER_NAME,
156 .probe = usb_pcwd_probe,
157 .disconnect = usb_pcwd_disconnect,
158 .id_table = usb_pcwd_table,
159 };
160
161
162 static void usb_pcwd_intr_done(struct urb *urb, struct pt_regs *regs)
163 {
164 struct usb_pcwd_private *usb_pcwd = (struct usb_pcwd_private *)urb->context;
165 unsigned char *data = usb_pcwd->intr_buffer;
166 int retval;
167
168 switch (urb->status) {
169 case 0: /* success */
170 break;
171 case -ECONNRESET: /* unlink */
172 case -ENOENT:
173 case -ESHUTDOWN:
174 /* this urb is terminated, clean up */
175 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
176 return;
177 /* -EPIPE: should clear the halt */
178 default: /* error */
179 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
180 goto resubmit;
181 }
182
183 dbg("received following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
184 data[0], data[1], data[2]);
185
186 usb_pcwd->cmd_command = data[0];
187 usb_pcwd->cmd_data_msb = data[1];
188 usb_pcwd->cmd_data_lsb = data[2];
189
190 /* notify anyone waiting that the cmd has finished */
191 atomic_set (&usb_pcwd->cmd_received, 1);
192
193 resubmit:
194 retval = usb_submit_urb (urb, GFP_ATOMIC);
195 if (retval)
196 printk(KERN_ERR PFX "can't resubmit intr, usb_submit_urb failed with result %d\n",
197 retval);
198 }
199
200 static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd, unsigned char cmd,
201 unsigned char *msb, unsigned char *lsb)
202 {
203 int got_response, count;
204 unsigned char buf[6];
205
206 /* We will not send any commands if the USB PCWD device does not exist */
207 if ((!usb_pcwd) || (!usb_pcwd->exists))
208 return -1;
209
210 /* The USB PC Watchdog uses a 6 byte report format. The board currently uses
211 * only 3 of the six bytes of the report. */
212 buf[0] = cmd; /* Byte 0 = CMD */
213 buf[1] = *msb; /* Byte 1 = Data MSB */
214 buf[2] = *lsb; /* Byte 2 = Data LSB */
215 buf[3] = buf[4] = buf[5] = 0; /* All other bytes not used */
216
217 dbg("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
218 buf[0], buf[1], buf[2]);
219
220 atomic_set (&usb_pcwd->cmd_received, 0);
221
222 if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0),
223 HID_REQ_SET_REPORT, HID_DT_REPORT,
224 0x0200, usb_pcwd->interface_number, buf, sizeof(buf),
225 USB_COMMAND_TIMEOUT) != sizeof(buf)) {
226 dbg("usb_pcwd_send_command: error in usb_control_msg for cmd 0x%x 0x%x 0x%x\n", cmd, *msb, *lsb);
227 }
228 /* wait till the usb card processed the command,
229 * with a max. timeout of USB_COMMAND_TIMEOUT */
230 got_response = 0;
231 for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response); count++) {
232 mdelay(1);
233 if (atomic_read (&usb_pcwd->cmd_received))
234 got_response = 1;
235 }
236
237 if ((got_response) && (cmd == usb_pcwd->cmd_command)) {
238 /* read back response */
239 *msb = usb_pcwd->cmd_data_msb;
240 *lsb = usb_pcwd->cmd_data_lsb;
241 }
242
243 return got_response;
244 }
245
246 static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd)
247 {
248 unsigned char msb = 0x00;
249 unsigned char lsb = 0x00;
250 int retval;
251
252 /* Enable Watchdog */
253 retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG, &msb, &lsb);
254
255 if ((retval == 0) || (lsb == 0)) {
256 printk(KERN_ERR PFX "Card did not acknowledge enable attempt\n");
257 return -1;
258 }
259
260 return 0;
261 }
262
263 static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd)
264 {
265 unsigned char msb = 0xA5;
266 unsigned char lsb = 0xC3;
267 int retval;
268
269 /* Disable Watchdog */
270 retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG, &msb, &lsb);
271
272 if ((retval == 0) || (lsb != 0)) {
273 printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n");
274 return -1;
275 }
276
277 return 0;
278 }
279
280 static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd)
281 {
282 unsigned char dummy;
283
284 /* Re-trigger Watchdog */
285 usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy);
286
287 return 0;
288 }
289
290 static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t)
291 {
292 unsigned char msb = t / 256;
293 unsigned char lsb = t % 256;
294
295 if ((t < 0x0001) || (t > 0xFFFF))
296 return -EINVAL;
297
298 /* Write new heartbeat to watchdog */
299 usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb);
300
301 heartbeat = t;
302 return 0;
303 }
304
305 static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd, int *temperature)
306 {
307 unsigned char msb, lsb;
308
309 usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb);
310
311 /*
312 * Convert celsius to fahrenheit, since this was
313 * the decided 'standard' for this return value.
314 */
315 *temperature = (lsb * 9 / 5) + 32;
316
317 return 0;
318 }
319
320 /*
321 * /dev/watchdog handling
322 */
323
324 static ssize_t usb_pcwd_write(struct file *file, const char __user *data,
325 size_t len, loff_t *ppos)
326 {
327 /* See if we got the magic character 'V' and reload the timer */
328 if (len) {
329 if (!nowayout) {
330 size_t i;
331
332 /* note: just in case someone wrote the magic character
333 * five months ago... */
334 expect_release = 0;
335
336 /* scan to see whether or not we got the magic character */
337 for (i = 0; i != len; i++) {
338 char c;
339 if(get_user(c, data+i))
340 return -EFAULT;
341 if (c == 'V')
342 expect_release = 42;
343 }
344 }
345
346 /* someone wrote to us, we should reload the timer */
347 usb_pcwd_keepalive(usb_pcwd_device);
348 }
349 return len;
350 }
351
352 static int usb_pcwd_ioctl(struct inode *inode, struct file *file,
353 unsigned int cmd, unsigned long arg)
354 {
355 void __user *argp = (void __user *)arg;
356 int __user *p = argp;
357 static struct watchdog_info ident = {
358 .options = WDIOF_KEEPALIVEPING |
359 WDIOF_SETTIMEOUT |
360 WDIOF_MAGICCLOSE,
361 .firmware_version = 1,
362 .identity = DRIVER_NAME,
363 };
364
365 switch (cmd) {
366 case WDIOC_GETSUPPORT:
367 return copy_to_user(argp, &ident,
368 sizeof (ident)) ? -EFAULT : 0;
369
370 case WDIOC_GETSTATUS:
371 case WDIOC_GETBOOTSTATUS:
372 return put_user(0, p);
373
374 case WDIOC_GETTEMP:
375 {
376 int temperature;
377
378 if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
379 return -EFAULT;
380
381 return put_user(temperature, p);
382 }
383
384 case WDIOC_KEEPALIVE:
385 usb_pcwd_keepalive(usb_pcwd_device);
386 return 0;
387
388 case WDIOC_SETOPTIONS:
389 {
390 int new_options, retval = -EINVAL;
391
392 if (get_user (new_options, p))
393 return -EFAULT;
394
395 if (new_options & WDIOS_DISABLECARD) {
396 usb_pcwd_stop(usb_pcwd_device);
397 retval = 0;
398 }
399
400 if (new_options & WDIOS_ENABLECARD) {
401 usb_pcwd_start(usb_pcwd_device);
402 retval = 0;
403 }
404
405 return retval;
406 }
407
408 case WDIOC_SETTIMEOUT:
409 {
410 int new_heartbeat;
411
412 if (get_user(new_heartbeat, p))
413 return -EFAULT;
414
415 if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat))
416 return -EINVAL;
417
418 usb_pcwd_keepalive(usb_pcwd_device);
419 /* Fall */
420 }
421
422 case WDIOC_GETTIMEOUT:
423 return put_user(heartbeat, p);
424
425 default:
426 return -ENOIOCTLCMD;
427 }
428 }
429
430 static int usb_pcwd_open(struct inode *inode, struct file *file)
431 {
432 /* /dev/watchdog can only be opened once */
433 if (test_and_set_bit(0, &is_active))
434 return -EBUSY;
435
436 /* Activate */
437 usb_pcwd_start(usb_pcwd_device);
438 usb_pcwd_keepalive(usb_pcwd_device);
439 return nonseekable_open(inode, file);
440 }
441
442 static int usb_pcwd_release(struct inode *inode, struct file *file)
443 {
444 /*
445 * Shut off the timer.
446 */
447 if (expect_release == 42) {
448 usb_pcwd_stop(usb_pcwd_device);
449 } else {
450 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
451 usb_pcwd_keepalive(usb_pcwd_device);
452 }
453 expect_release = 0;
454 clear_bit(0, &is_active);
455 return 0;
456 }
457
458 /*
459 * /dev/temperature handling
460 */
461
462 static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data,
463 size_t len, loff_t *ppos)
464 {
465 int temperature;
466
467 if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
468 return -EFAULT;
469
470 if (copy_to_user(data, &temperature, 1))
471 return -EFAULT;
472
473 return 1;
474 }
475
476 static int usb_pcwd_temperature_open(struct inode *inode, struct file *file)
477 {
478 return nonseekable_open(inode, file);
479 }
480
481 static int usb_pcwd_temperature_release(struct inode *inode, struct file *file)
482 {
483 return 0;
484 }
485
486 /*
487 * Notify system
488 */
489
490 static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
491 {
492 if (code==SYS_DOWN || code==SYS_HALT) {
493 /* Turn the WDT off */
494 usb_pcwd_stop(usb_pcwd_device);
495 }
496
497 return NOTIFY_DONE;
498 }
499
500 /*
501 * Kernel Interfaces
502 */
503
504 static struct file_operations usb_pcwd_fops = {
505 .owner = THIS_MODULE,
506 .llseek = no_llseek,
507 .write = usb_pcwd_write,
508 .ioctl = usb_pcwd_ioctl,
509 .open = usb_pcwd_open,
510 .release = usb_pcwd_release,
511 };
512
513 static struct miscdevice usb_pcwd_miscdev = {
514 .minor = WATCHDOG_MINOR,
515 .name = "watchdog",
516 .fops = &usb_pcwd_fops,
517 };
518
519 static struct file_operations usb_pcwd_temperature_fops = {
520 .owner = THIS_MODULE,
521 .llseek = no_llseek,
522 .read = usb_pcwd_temperature_read,
523 .open = usb_pcwd_temperature_open,
524 .release = usb_pcwd_temperature_release,
525 };
526
527 static struct miscdevice usb_pcwd_temperature_miscdev = {
528 .minor = TEMP_MINOR,
529 .name = "temperature",
530 .fops = &usb_pcwd_temperature_fops,
531 };
532
533 static struct notifier_block usb_pcwd_notifier = {
534 .notifier_call = usb_pcwd_notify_sys,
535 };
536
537 /**
538 * usb_pcwd_delete
539 */
540 static inline void usb_pcwd_delete (struct usb_pcwd_private *usb_pcwd)
541 {
542 if (usb_pcwd->intr_urb != NULL)
543 usb_free_urb (usb_pcwd->intr_urb);
544 if (usb_pcwd->intr_buffer != NULL)
545 usb_buffer_free(usb_pcwd->udev, usb_pcwd->intr_size,
546 usb_pcwd->intr_buffer, usb_pcwd->intr_dma);
547 kfree (usb_pcwd);
548 }
549
550 /**
551 * usb_pcwd_probe
552 *
553 * Called by the usb core when a new device is connected that it thinks
554 * this driver might be interested in.
555 */
556 static int usb_pcwd_probe(struct usb_interface *interface, const struct usb_device_id *id)
557 {
558 struct usb_device *udev = interface_to_usbdev(interface);
559 struct usb_host_interface *iface_desc;
560 struct usb_endpoint_descriptor *endpoint;
561 struct usb_pcwd_private *usb_pcwd = NULL;
562 int pipe, maxp;
563 int retval = -ENOMEM;
564 int got_fw_rev;
565 unsigned char fw_rev_major, fw_rev_minor;
566 char fw_ver_str[20];
567 unsigned char option_switches, dummy;
568
569 cards_found++;
570 if (cards_found > 1) {
571 printk(KERN_ERR PFX "This driver only supports 1 device\n");
572 return -ENODEV;
573 }
574
575 /* get the active interface descriptor */
576 iface_desc = interface->cur_altsetting;
577
578 /* check out that we have a HID device */
579 if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) {
580 printk(KERN_ERR PFX "The device isn't a Human Interface Device\n");
581 return -ENODEV;
582 }
583
584 /* check out the endpoint: it has to be Interrupt & IN */
585 endpoint = &iface_desc->endpoint[0].desc;
586
587 if (!((endpoint->bEndpointAddress & USB_DIR_IN) &&
588 ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
589 == USB_ENDPOINT_XFER_INT))) {
590 /* we didn't find a Interrupt endpoint with direction IN */
591 printk(KERN_ERR PFX "Couldn't find an INTR & IN endpoint\n");
592 return -ENODEV;
593 }
594
595 /* get a handle to the interrupt data pipe */
596 pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
597 maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
598
599 /* allocate memory for our device and initialize it */
600 usb_pcwd = kmalloc (sizeof(struct usb_pcwd_private), GFP_KERNEL);
601 if (usb_pcwd == NULL) {
602 printk(KERN_ERR PFX "Out of memory\n");
603 goto error;
604 }
605 memset (usb_pcwd, 0x00, sizeof (*usb_pcwd));
606
607 usb_pcwd_device = usb_pcwd;
608
609 init_MUTEX (&usb_pcwd->sem);
610 usb_pcwd->udev = udev;
611 usb_pcwd->interface = interface;
612 usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber;
613 usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ? le16_to_cpu(endpoint->wMaxPacketSize) : 8);
614
615 /* set up the memory buffer's */
616 if (!(usb_pcwd->intr_buffer = usb_buffer_alloc(udev, usb_pcwd->intr_size, SLAB_ATOMIC, &usb_pcwd->intr_dma))) {
617 printk(KERN_ERR PFX "Out of memory\n");
618 goto error;
619 }
620
621 /* allocate the urb's */
622 usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
623 if (!usb_pcwd->intr_urb) {
624 printk(KERN_ERR PFX "Out of memory\n");
625 goto error;
626 }
627
628 /* initialise the intr urb's */
629 usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe,
630 usb_pcwd->intr_buffer, usb_pcwd->intr_size,
631 usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval);
632 usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma;
633 usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
634
635 /* register our interrupt URB with the USB system */
636 if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) {
637 printk(KERN_ERR PFX "Problem registering interrupt URB\n");
638 retval = -EIO; /* failure */
639 goto error;
640 }
641
642 /* The device exists and can be communicated with */
643 usb_pcwd->exists = 1;
644
645 /* disable card */
646 usb_pcwd_stop(usb_pcwd);
647
648 /* Get the Firmware Version */
649 got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor);
650 if (got_fw_rev) {
651 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
652 } else {
653 sprintf(fw_ver_str, "<card no answer>");
654 }
655
656 printk(KERN_INFO PFX "Found card (Firmware: %s) with temp option\n",
657 fw_ver_str);
658
659 /* Get switch settings */
660 usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy, &option_switches);
661
662 printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
663 option_switches,
664 ((option_switches & 0x10) ? "ON" : "OFF"),
665 ((option_switches & 0x08) ? "ON" : "OFF"));
666
667 /* Check that the heartbeat value is within it's range ; if not reset to the default */
668 if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) {
669 usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT);
670 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
671 WATCHDOG_HEARTBEAT);
672 }
673
674 retval = register_reboot_notifier(&usb_pcwd_notifier);
675 if (retval != 0) {
676 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
677 retval);
678 goto error;
679 }
680
681 retval = misc_register(&usb_pcwd_temperature_miscdev);
682 if (retval != 0) {
683 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
684 TEMP_MINOR, retval);
685 goto err_out_unregister_reboot;
686 }
687
688 retval = misc_register(&usb_pcwd_miscdev);
689 if (retval != 0) {
690 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
691 WATCHDOG_MINOR, retval);
692 goto err_out_misc_deregister;
693 }
694
695 /* we can register the device now, as it is ready */
696 usb_set_intfdata (interface, usb_pcwd);
697
698 printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
699 heartbeat, nowayout);
700
701 return 0;
702
703 err_out_misc_deregister:
704 misc_deregister(&usb_pcwd_temperature_miscdev);
705 err_out_unregister_reboot:
706 unregister_reboot_notifier(&usb_pcwd_notifier);
707 error:
708 if (usb_pcwd)
709 usb_pcwd_delete(usb_pcwd);
710 usb_pcwd_device = NULL;
711 return retval;
712 }
713
714
715 /**
716 * usb_pcwd_disconnect
717 *
718 * Called by the usb core when the device is removed from the system.
719 *
720 * This routine guarantees that the driver will not submit any more urbs
721 * by clearing dev->udev.
722 */
723 static void usb_pcwd_disconnect(struct usb_interface *interface)
724 {
725 struct usb_pcwd_private *usb_pcwd;
726
727 /* prevent races with open() */
728 mutex_lock(&disconnect_mutex);
729
730 usb_pcwd = usb_get_intfdata (interface);
731 usb_set_intfdata (interface, NULL);
732
733 down (&usb_pcwd->sem);
734
735 /* Stop the timer before we leave */
736 if (!nowayout)
737 usb_pcwd_stop(usb_pcwd);
738
739 /* We should now stop communicating with the USB PCWD device */
740 usb_pcwd->exists = 0;
741
742 /* Deregister */
743 misc_deregister(&usb_pcwd_miscdev);
744 misc_deregister(&usb_pcwd_temperature_miscdev);
745 unregister_reboot_notifier(&usb_pcwd_notifier);
746
747 up (&usb_pcwd->sem);
748
749 /* Delete the USB PCWD device */
750 usb_pcwd_delete(usb_pcwd);
751
752 cards_found--;
753
754 mutex_unlock(&disconnect_mutex);
755
756 printk(KERN_INFO PFX "USB PC Watchdog disconnected\n");
757 }
758
759
760
761 /**
762 * usb_pcwd_init
763 */
764 static int __init usb_pcwd_init(void)
765 {
766 int result;
767
768 /* register this driver with the USB subsystem */
769 result = usb_register(&usb_pcwd_driver);
770 if (result) {
771 printk(KERN_ERR PFX "usb_register failed. Error number %d\n",
772 result);
773 return result;
774 }
775
776 printk(KERN_INFO PFX DRIVER_DESC " v" DRIVER_VERSION " (" DRIVER_DATE ")\n");
777 return 0;
778 }
779
780
781 /**
782 * usb_pcwd_exit
783 */
784 static void __exit usb_pcwd_exit(void)
785 {
786 /* deregister this driver with the USB subsystem */
787 usb_deregister(&usb_pcwd_driver);
788 }
789
790
791 module_init (usb_pcwd_init);
792 module_exit (usb_pcwd_exit);
793
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