61138726b501ea710459f3f36dbbef085eee475f
[linux-2.6.git] / drivers / char / watchdog / pcwd_usb.c
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/kernel.h>
28 #include <linux/errno.h>
29 #include <linux/init.h>
30 #include <linux/slab.h>
31 #include <linux/module.h>
32 #include <linux/moduleparam.h>
33 #include <linux/types.h>
34 #include <linux/delay.h>
35 #include <linux/miscdevice.h>
36 #include <linux/watchdog.h>
37 #include <linux/notifier.h>
38 #include <linux/reboot.h>
39 #include <linux/fs.h>
40 #include <linux/smp_lock.h>
41 #include <linux/completion.h>
42 #include <asm/uaccess.h>
43 #include <linux/usb.h>
44 #include <linux/mutex.h>
45
46
47 #ifdef CONFIG_USB_DEBUG
48         static int debug = 1;
49 #else
50         static int debug;
51 #endif
52
53 /* Use our own dbg macro */
54 #undef dbg
55 #define dbg(format, arg...) do { if (debug) printk(KERN_DEBUG PFX format "\n" , ## arg); } while (0)
56
57
58 /* Module and Version Information */
59 #define DRIVER_VERSION "1.01"
60 #define DRIVER_DATE "15 Mar 2005"
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 ": "
66
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);
72
73 /* Module Parameters */
74 module_param(debug, int, 0);
75 MODULE_PARM_DESC(debug, "Debug enabled or not");
76
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) ")");
81
82 static int nowayout = WATCHDOG_NOWAYOUT;
83 module_param(nowayout, int, 0);
84 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
85
86 /* The vendor and product id's for the USB-PC Watchdog card */
87 #define USB_PCWD_VENDOR_ID      0x0c98
88 #define USB_PCWD_PRODUCT_ID     0x1140
89
90 /* table of devices that work with this driver */
91 static struct usb_device_id usb_pcwd_table [] = {
92         { USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) },
93         { }                                     /* Terminating entry */
94 };
95 MODULE_DEVICE_TABLE (usb, usb_pcwd_table);
96
97 /* according to documentation max. time to process a command for the USB
98  * watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */
99 #define USB_COMMAND_TIMEOUT     250
100
101 /* Watchdog's internal commands */
102 #define CMD_READ_TEMP                   0x02    /* Read Temperature; Re-trigger Watchdog */
103 #define CMD_TRIGGER                     CMD_READ_TEMP
104 #define CMD_GET_STATUS                  0x04    /* Get Status Information */
105 #define CMD_GET_FIRMWARE_VERSION        0x08    /* Get Firmware Version */
106 #define CMD_GET_DIP_SWITCH_SETTINGS     0x0c    /* Get Dip Switch Settings */
107 #define CMD_READ_WATCHDOG_TIMEOUT       0x18    /* Read Current Watchdog Time */
108 #define CMD_WRITE_WATCHDOG_TIMEOUT      0x19    /* Write Current Watchdog Time */
109 #define CMD_ENABLE_WATCHDOG             0x30    /* Enable / Disable Watchdog */
110 #define CMD_DISABLE_WATCHDOG            CMD_ENABLE_WATCHDOG
111
112 /* Some defines that I like to be somewhere else like include/linux/usb_hid.h */
113 #define HID_REQ_SET_REPORT              0x09
114 #define HID_DT_REPORT                   (USB_TYPE_CLASS | 0x02)
115
116 /* We can only use 1 card due to the /dev/watchdog restriction */
117 static int cards_found;
118
119 /* some internal variables */
120 static unsigned long is_active;
121 static char expect_release;
122
123 /* Structure to hold all of our device specific stuff */
124 struct usb_pcwd_private {
125         struct usb_device *     udev;                   /* save off the usb device pointer */
126         struct usb_interface *  interface;              /* the interface for this device */
127
128         unsigned int            interface_number;       /* the interface number used for cmd's */
129
130         unsigned char *         intr_buffer;            /* the buffer to intr data */
131         dma_addr_t              intr_dma;               /* the dma address for the intr buffer */
132         size_t                  intr_size;              /* the size of the intr buffer */
133         struct urb *            intr_urb;               /* the urb used for the intr pipe */
134
135         unsigned char           cmd_command;            /* The command that is reported back */
136         unsigned char           cmd_data_msb;           /* The data MSB that is reported back */
137         unsigned char           cmd_data_lsb;           /* The data LSB that is reported back */
138         atomic_t                cmd_received;           /* true if we received a report after a command */
139
140         int                     exists;                 /* Wether or not the device exists */
141         struct semaphore        sem;                    /* locks this structure */
142 };
143 static struct usb_pcwd_private *usb_pcwd_device;
144
145 /* prevent races between open() and disconnect() */
146 static DEFINE_MUTEX(disconnect_mutex);
147
148 /* local function prototypes */
149 static int usb_pcwd_probe       (struct usb_interface *interface, const struct usb_device_id *id);
150 static void usb_pcwd_disconnect (struct usb_interface *interface);
151
152 /* usb specific object needed to register this driver with the usb subsystem */
153 static struct usb_driver usb_pcwd_driver = {
154         .name =         DRIVER_NAME,
155         .probe =        usb_pcwd_probe,
156         .disconnect =   usb_pcwd_disconnect,
157         .id_table =     usb_pcwd_table,
158 };
159
160
161 static void usb_pcwd_intr_done(struct urb *urb)
162 {
163         struct usb_pcwd_private *usb_pcwd = (struct usb_pcwd_private *)urb->context;
164         unsigned char *data = usb_pcwd->intr_buffer;
165         int retval;
166
167         switch (urb->status) {
168         case 0:                 /* success */
169                 break;
170         case -ECONNRESET:       /* unlink */
171         case -ENOENT:
172         case -ESHUTDOWN:
173                 /* this urb is terminated, clean up */
174                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
175                 return;
176         /* -EPIPE:  should clear the halt */
177         default:                /* error */
178                 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
179                 goto resubmit;
180         }
181
182         dbg("received following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
183                 data[0], data[1], data[2]);
184
185         usb_pcwd->cmd_command  = data[0];
186         usb_pcwd->cmd_data_msb = data[1];
187         usb_pcwd->cmd_data_lsb = data[2];
188
189         /* notify anyone waiting that the cmd has finished */
190         atomic_set (&usb_pcwd->cmd_received, 1);
191
192 resubmit:
193         retval = usb_submit_urb (urb, GFP_ATOMIC);
194         if (retval)
195                 printk(KERN_ERR PFX "can't resubmit intr, usb_submit_urb failed with result %d\n",
196                         retval);
197 }
198
199 static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd, unsigned char cmd,
200         unsigned char *msb, unsigned char *lsb)
201 {
202         int got_response, count;
203         unsigned char buf[6];
204
205         /* We will not send any commands if the USB PCWD device does not exist */
206         if ((!usb_pcwd) || (!usb_pcwd->exists))
207                 return -1;
208
209         /* The USB PC Watchdog uses a 6 byte report format. The board currently uses
210          * only 3 of the six bytes of the report. */
211         buf[0] = cmd;                   /* Byte 0 = CMD */
212         buf[1] = *msb;                  /* Byte 1 = Data MSB */
213         buf[2] = *lsb;                  /* Byte 2 = Data LSB */
214         buf[3] = buf[4] = buf[5] = 0;   /* All other bytes not used */
215
216         dbg("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
217                 buf[0], buf[1], buf[2]);
218
219         atomic_set (&usb_pcwd->cmd_received, 0);
220
221         if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0),
222                         HID_REQ_SET_REPORT, HID_DT_REPORT,
223                         0x0200, usb_pcwd->interface_number, buf, sizeof(buf),
224                         USB_COMMAND_TIMEOUT) != sizeof(buf)) {
225                 dbg("usb_pcwd_send_command: error in usb_control_msg for cmd 0x%x 0x%x 0x%x\n", cmd, *msb, *lsb);
226         }
227         /* wait till the usb card processed the command,
228          * with a max. timeout of USB_COMMAND_TIMEOUT */
229         got_response = 0;
230         for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response); count++) {
231                 mdelay(1);
232                 if (atomic_read (&usb_pcwd->cmd_received))
233                         got_response = 1;
234         }
235
236         if ((got_response) && (cmd == usb_pcwd->cmd_command)) {
237                 /* read back response */
238                 *msb = usb_pcwd->cmd_data_msb;
239                 *lsb = usb_pcwd->cmd_data_lsb;
240         }
241
242         return got_response;
243 }
244
245 static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd)
246 {
247         unsigned char msb = 0x00;
248         unsigned char lsb = 0x00;
249         int retval;
250
251         /* Enable Watchdog */
252         retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG, &msb, &lsb);
253
254         if ((retval == 0) || (lsb == 0)) {
255                 printk(KERN_ERR PFX "Card did not acknowledge enable attempt\n");
256                 return -1;
257         }
258
259         return 0;
260 }
261
262 static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd)
263 {
264         unsigned char msb = 0xA5;
265         unsigned char lsb = 0xC3;
266         int retval;
267
268         /* Disable Watchdog */
269         retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG, &msb, &lsb);
270
271         if ((retval == 0) || (lsb != 0)) {
272                 printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n");
273                 return -1;
274         }
275
276         return 0;
277 }
278
279 static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd)
280 {
281         unsigned char dummy;
282
283         /* Re-trigger Watchdog */
284         usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy);
285
286         return 0;
287 }
288
289 static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t)
290 {
291         unsigned char msb = t / 256;
292         unsigned char lsb = t % 256;
293
294         if ((t < 0x0001) || (t > 0xFFFF))
295                 return -EINVAL;
296
297         /* Write new heartbeat to watchdog */
298         usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb);
299
300         heartbeat = t;
301         return 0;
302 }
303
304 static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd, int *temperature)
305 {
306         unsigned char msb, lsb;
307
308         usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb);
309
310         /*
311          * Convert celsius to fahrenheit, since this was
312          * the decided 'standard' for this return value.
313          */
314         *temperature = (lsb * 9 / 5) + 32;
315
316         return 0;
317 }
318
319 static int usb_pcwd_get_timeleft(struct usb_pcwd_private *usb_pcwd, int *time_left)
320 {
321         unsigned char msb, lsb;
322
323         /* Read the time that's left before rebooting */
324         /* Note: if the board is not yet armed then we will read 0xFFFF */
325         usb_pcwd_send_command(usb_pcwd, CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
326
327         *time_left = (msb << 8) + lsb;
328
329         return 0;
330 }
331
332 /*
333  *      /dev/watchdog handling
334  */
335
336 static ssize_t usb_pcwd_write(struct file *file, const char __user *data,
337                               size_t len, loff_t *ppos)
338 {
339         /* See if we got the magic character 'V' and reload the timer */
340         if (len) {
341                 if (!nowayout) {
342                         size_t i;
343
344                         /* note: just in case someone wrote the magic character
345                          * five months ago... */
346                         expect_release = 0;
347
348                         /* scan to see whether or not we got the magic character */
349                         for (i = 0; i != len; i++) {
350                                 char c;
351                                 if(get_user(c, data+i))
352                                         return -EFAULT;
353                                 if (c == 'V')
354                                         expect_release = 42;
355                         }
356                 }
357
358                 /* someone wrote to us, we should reload the timer */
359                 usb_pcwd_keepalive(usb_pcwd_device);
360         }
361         return len;
362 }
363
364 static int usb_pcwd_ioctl(struct inode *inode, struct file *file,
365                           unsigned int cmd, unsigned long arg)
366 {
367         void __user *argp = (void __user *)arg;
368         int __user *p = argp;
369         static struct watchdog_info ident = {
370                 .options =              WDIOF_KEEPALIVEPING |
371                                         WDIOF_SETTIMEOUT |
372                                         WDIOF_MAGICCLOSE,
373                 .firmware_version =     1,
374                 .identity =             DRIVER_NAME,
375         };
376
377         switch (cmd) {
378                 case WDIOC_GETSUPPORT:
379                         return copy_to_user(argp, &ident,
380                                 sizeof (ident)) ? -EFAULT : 0;
381
382                 case WDIOC_GETSTATUS:
383                 case WDIOC_GETBOOTSTATUS:
384                         return put_user(0, p);
385
386                 case WDIOC_GETTEMP:
387                 {
388                         int temperature;
389
390                         if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
391                                 return -EFAULT;
392
393                         return put_user(temperature, p);
394                 }
395
396                 case WDIOC_KEEPALIVE:
397                         usb_pcwd_keepalive(usb_pcwd_device);
398                         return 0;
399
400                 case WDIOC_SETOPTIONS:
401                 {
402                         int new_options, retval = -EINVAL;
403
404                         if (get_user (new_options, p))
405                                 return -EFAULT;
406
407                         if (new_options & WDIOS_DISABLECARD) {
408                                 usb_pcwd_stop(usb_pcwd_device);
409                                 retval = 0;
410                         }
411
412                         if (new_options & WDIOS_ENABLECARD) {
413                                 usb_pcwd_start(usb_pcwd_device);
414                                 retval = 0;
415                         }
416
417                         return retval;
418                 }
419
420                 case WDIOC_SETTIMEOUT:
421                 {
422                         int new_heartbeat;
423
424                         if (get_user(new_heartbeat, p))
425                                 return -EFAULT;
426
427                         if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat))
428                             return -EINVAL;
429
430                         usb_pcwd_keepalive(usb_pcwd_device);
431                         /* Fall */
432                 }
433
434                 case WDIOC_GETTIMEOUT:
435                         return put_user(heartbeat, p);
436
437                 case WDIOC_GETTIMELEFT:
438                 {
439                         int time_left;
440
441                         if (usb_pcwd_get_timeleft(usb_pcwd_device, &time_left))
442                                 return -EFAULT;
443
444                         return put_user(time_left, p);
445                 }
446
447                 default:
448                         return -ENOTTY;
449         }
450 }
451
452 static int usb_pcwd_open(struct inode *inode, struct file *file)
453 {
454         /* /dev/watchdog can only be opened once */
455         if (test_and_set_bit(0, &is_active))
456                 return -EBUSY;
457
458         /* Activate */
459         usb_pcwd_start(usb_pcwd_device);
460         usb_pcwd_keepalive(usb_pcwd_device);
461         return nonseekable_open(inode, file);
462 }
463
464 static int usb_pcwd_release(struct inode *inode, struct file *file)
465 {
466         /*
467          *      Shut off the timer.
468          */
469         if (expect_release == 42) {
470                 usb_pcwd_stop(usb_pcwd_device);
471         } else {
472                 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
473                 usb_pcwd_keepalive(usb_pcwd_device);
474         }
475         expect_release = 0;
476         clear_bit(0, &is_active);
477         return 0;
478 }
479
480 /*
481  *      /dev/temperature handling
482  */
483
484 static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data,
485                                 size_t len, loff_t *ppos)
486 {
487         int temperature;
488
489         if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
490                 return -EFAULT;
491
492         if (copy_to_user(data, &temperature, 1))
493                 return -EFAULT;
494
495         return 1;
496 }
497
498 static int usb_pcwd_temperature_open(struct inode *inode, struct file *file)
499 {
500         return nonseekable_open(inode, file);
501 }
502
503 static int usb_pcwd_temperature_release(struct inode *inode, struct file *file)
504 {
505         return 0;
506 }
507
508 /*
509  *      Notify system
510  */
511
512 static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
513 {
514         if (code==SYS_DOWN || code==SYS_HALT) {
515                 /* Turn the WDT off */
516                 usb_pcwd_stop(usb_pcwd_device);
517         }
518
519         return NOTIFY_DONE;
520 }
521
522 /*
523  *      Kernel Interfaces
524  */
525
526 static const struct file_operations usb_pcwd_fops = {
527         .owner =        THIS_MODULE,
528         .llseek =       no_llseek,
529         .write =        usb_pcwd_write,
530         .ioctl =        usb_pcwd_ioctl,
531         .open =         usb_pcwd_open,
532         .release =      usb_pcwd_release,
533 };
534
535 static struct miscdevice usb_pcwd_miscdev = {
536         .minor =        WATCHDOG_MINOR,
537         .name =         "watchdog",
538         .fops =         &usb_pcwd_fops,
539 };
540
541 static const struct file_operations usb_pcwd_temperature_fops = {
542         .owner =        THIS_MODULE,
543         .llseek =       no_llseek,
544         .read =         usb_pcwd_temperature_read,
545         .open =         usb_pcwd_temperature_open,
546         .release =      usb_pcwd_temperature_release,
547 };
548
549 static struct miscdevice usb_pcwd_temperature_miscdev = {
550         .minor =        TEMP_MINOR,
551         .name =         "temperature",
552         .fops =         &usb_pcwd_temperature_fops,
553 };
554
555 static struct notifier_block usb_pcwd_notifier = {
556         .notifier_call =        usb_pcwd_notify_sys,
557 };
558
559 /**
560  *      usb_pcwd_delete
561  */
562 static inline void usb_pcwd_delete (struct usb_pcwd_private *usb_pcwd)
563 {
564         usb_free_urb(usb_pcwd->intr_urb);
565         if (usb_pcwd->intr_buffer != NULL)
566                 usb_buffer_free(usb_pcwd->udev, usb_pcwd->intr_size,
567                                 usb_pcwd->intr_buffer, usb_pcwd->intr_dma);
568         kfree (usb_pcwd);
569 }
570
571 /**
572  *      usb_pcwd_probe
573  *
574  *      Called by the usb core when a new device is connected that it thinks
575  *      this driver might be interested in.
576  */
577 static int usb_pcwd_probe(struct usb_interface *interface, const struct usb_device_id *id)
578 {
579         struct usb_device *udev = interface_to_usbdev(interface);
580         struct usb_host_interface *iface_desc;
581         struct usb_endpoint_descriptor *endpoint;
582         struct usb_pcwd_private *usb_pcwd = NULL;
583         int pipe, maxp;
584         int retval = -ENOMEM;
585         int got_fw_rev;
586         unsigned char fw_rev_major, fw_rev_minor;
587         char fw_ver_str[20];
588         unsigned char option_switches, dummy;
589
590         cards_found++;
591         if (cards_found > 1) {
592                 printk(KERN_ERR PFX "This driver only supports 1 device\n");
593                 return -ENODEV;
594         }
595
596         /* get the active interface descriptor */
597         iface_desc = interface->cur_altsetting;
598
599         /* check out that we have a HID device */
600         if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) {
601                 printk(KERN_ERR PFX "The device isn't a Human Interface Device\n");
602                 return -ENODEV;
603         }
604
605         /* check out the endpoint: it has to be Interrupt & IN */
606         endpoint = &iface_desc->endpoint[0].desc;
607
608         if (!((endpoint->bEndpointAddress & USB_DIR_IN) &&
609              ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
610                                 == USB_ENDPOINT_XFER_INT))) {
611                 /* we didn't find a Interrupt endpoint with direction IN */
612                 printk(KERN_ERR PFX "Couldn't find an INTR & IN endpoint\n");
613                 return -ENODEV;
614         }
615
616         /* get a handle to the interrupt data pipe */
617         pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
618         maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
619
620         /* allocate memory for our device and initialize it */
621         usb_pcwd = kmalloc (sizeof(struct usb_pcwd_private), GFP_KERNEL);
622         if (usb_pcwd == NULL) {
623                 printk(KERN_ERR PFX "Out of memory\n");
624                 goto error;
625         }
626         memset (usb_pcwd, 0x00, sizeof (*usb_pcwd));
627
628         usb_pcwd_device = usb_pcwd;
629
630         init_MUTEX (&usb_pcwd->sem);
631         usb_pcwd->udev = udev;
632         usb_pcwd->interface = interface;
633         usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber;
634         usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ? le16_to_cpu(endpoint->wMaxPacketSize) : 8);
635
636         /* set up the memory buffer's */
637         if (!(usb_pcwd->intr_buffer = usb_buffer_alloc(udev, usb_pcwd->intr_size, GFP_ATOMIC, &usb_pcwd->intr_dma))) {
638                 printk(KERN_ERR PFX "Out of memory\n");
639                 goto error;
640         }
641
642         /* allocate the urb's */
643         usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
644         if (!usb_pcwd->intr_urb) {
645                 printk(KERN_ERR PFX "Out of memory\n");
646                 goto error;
647         }
648
649         /* initialise the intr urb's */
650         usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe,
651                         usb_pcwd->intr_buffer, usb_pcwd->intr_size,
652                         usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval);
653         usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma;
654         usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
655
656         /* register our interrupt URB with the USB system */
657         if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) {
658                 printk(KERN_ERR PFX "Problem registering interrupt URB\n");
659                 retval = -EIO; /* failure */
660                 goto error;
661         }
662
663         /* The device exists and can be communicated with */
664         usb_pcwd->exists = 1;
665
666         /* disable card */
667         usb_pcwd_stop(usb_pcwd);
668
669         /* Get the Firmware Version */
670         got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor);
671         if (got_fw_rev) {
672                 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
673         } else {
674                 sprintf(fw_ver_str, "<card no answer>");
675         }
676
677         printk(KERN_INFO PFX "Found card (Firmware: %s) with temp option\n",
678                 fw_ver_str);
679
680         /* Get switch settings */
681         usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy, &option_switches);
682
683         printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
684                 option_switches,
685                 ((option_switches & 0x10) ? "ON" : "OFF"),
686                 ((option_switches & 0x08) ? "ON" : "OFF"));
687
688         /* Check that the heartbeat value is within it's range ; if not reset to the default */
689         if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) {
690                 usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT);
691                 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
692                         WATCHDOG_HEARTBEAT);
693         }
694
695         retval = register_reboot_notifier(&usb_pcwd_notifier);
696         if (retval != 0) {
697                 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
698                         retval);
699                 goto error;
700         }
701
702         retval = misc_register(&usb_pcwd_temperature_miscdev);
703         if (retval != 0) {
704                 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
705                         TEMP_MINOR, retval);
706                 goto err_out_unregister_reboot;
707         }
708
709         retval = misc_register(&usb_pcwd_miscdev);
710         if (retval != 0) {
711                 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
712                         WATCHDOG_MINOR, retval);
713                 goto err_out_misc_deregister;
714         }
715
716         /* we can register the device now, as it is ready */
717         usb_set_intfdata (interface, usb_pcwd);
718
719         printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
720                 heartbeat, nowayout);
721
722         return 0;
723
724 err_out_misc_deregister:
725         misc_deregister(&usb_pcwd_temperature_miscdev);
726 err_out_unregister_reboot:
727         unregister_reboot_notifier(&usb_pcwd_notifier);
728 error:
729         if (usb_pcwd)
730                 usb_pcwd_delete(usb_pcwd);
731         usb_pcwd_device = NULL;
732         return retval;
733 }
734
735
736 /**
737  *      usb_pcwd_disconnect
738  *
739  *      Called by the usb core when the device is removed from the system.
740  *
741  *      This routine guarantees that the driver will not submit any more urbs
742  *      by clearing dev->udev.
743  */
744 static void usb_pcwd_disconnect(struct usb_interface *interface)
745 {
746         struct usb_pcwd_private *usb_pcwd;
747
748         /* prevent races with open() */
749         mutex_lock(&disconnect_mutex);
750
751         usb_pcwd = usb_get_intfdata (interface);
752         usb_set_intfdata (interface, NULL);
753
754         down (&usb_pcwd->sem);
755
756         /* Stop the timer before we leave */
757         if (!nowayout)
758                 usb_pcwd_stop(usb_pcwd);
759
760         /* We should now stop communicating with the USB PCWD device */
761         usb_pcwd->exists = 0;
762
763         /* Deregister */
764         misc_deregister(&usb_pcwd_miscdev);
765         misc_deregister(&usb_pcwd_temperature_miscdev);
766         unregister_reboot_notifier(&usb_pcwd_notifier);
767
768         up (&usb_pcwd->sem);
769
770         /* Delete the USB PCWD device */
771         usb_pcwd_delete(usb_pcwd);
772
773         cards_found--;
774
775         mutex_unlock(&disconnect_mutex);
776
777         printk(KERN_INFO PFX "USB PC Watchdog disconnected\n");
778 }
779
780
781
782 /**
783  *      usb_pcwd_init
784  */
785 static int __init usb_pcwd_init(void)
786 {
787         int result;
788
789         /* register this driver with the USB subsystem */
790         result = usb_register(&usb_pcwd_driver);
791         if (result) {
792                 printk(KERN_ERR PFX "usb_register failed. Error number %d\n",
793                     result);
794                 return result;
795         }
796
797         printk(KERN_INFO PFX DRIVER_DESC " v" DRIVER_VERSION " (" DRIVER_DATE ")\n");
798         return 0;
799 }
800
801
802 /**
803  *      usb_pcwd_exit
804  */
805 static void __exit usb_pcwd_exit(void)
806 {
807         /* deregister this driver with the USB subsystem */
808         usb_deregister(&usb_pcwd_driver);
809 }
810
811
812 module_init (usb_pcwd_init);
813 module_exit (usb_pcwd_exit);