092e9b133750f67f56d803df1ce06039ab6c78cf
[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/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
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 DECLARE_MUTEX (disconnect_sem);
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         .owner =        THIS_MODULE,
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         usb_pcwd_delete (usb_pcwd);
709         usb_pcwd_device = NULL;
710         return retval;
711 }
712
713
714 /**
715  *      usb_pcwd_disconnect
716  *
717  *      Called by the usb core when the device is removed from the system.
718  *
719  *      This routine guarantees that the driver will not submit any more urbs
720  *      by clearing dev->udev.
721  */
722 static void usb_pcwd_disconnect(struct usb_interface *interface)
723 {
724         struct usb_pcwd_private *usb_pcwd;
725
726         /* prevent races with open() */
727         down (&disconnect_sem);
728
729         usb_pcwd = usb_get_intfdata (interface);
730         usb_set_intfdata (interface, NULL);
731
732         down (&usb_pcwd->sem);
733
734         /* Stop the timer before we leave */
735         if (!nowayout)
736                 usb_pcwd_stop(usb_pcwd);
737
738         /* We should now stop communicating with the USB PCWD device */
739         usb_pcwd->exists = 0;
740
741         /* Deregister */
742         misc_deregister(&usb_pcwd_miscdev);
743         misc_deregister(&usb_pcwd_temperature_miscdev);
744         unregister_reboot_notifier(&usb_pcwd_notifier);
745
746         up (&usb_pcwd->sem);
747
748         /* Delete the USB PCWD device */
749         usb_pcwd_delete(usb_pcwd);
750
751         cards_found--;
752
753         up (&disconnect_sem);
754
755         printk(KERN_INFO PFX "USB PC Watchdog disconnected\n");
756 }
757
758
759
760 /**
761  *      usb_pcwd_init
762  */
763 static int __init usb_pcwd_init(void)
764 {
765         int result;
766
767         /* register this driver with the USB subsystem */
768         result = usb_register(&usb_pcwd_driver);
769         if (result) {
770                 printk(KERN_ERR PFX "usb_register failed. Error number %d\n",
771                     result);
772                 return result;
773         }
774
775         printk(KERN_INFO PFX DRIVER_DESC " v" DRIVER_VERSION " (" DRIVER_DATE ")\n");
776         return 0;
777 }
778
779
780 /**
781  *      usb_pcwd_exit
782  */
783 static void __exit usb_pcwd_exit(void)
784 {
785         /* deregister this driver with the USB subsystem */
786         usb_deregister(&usb_pcwd_driver);
787 }
788
789
790 module_init (usb_pcwd_init);
791 module_exit (usb_pcwd_exit);