Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm
[linux-2.6] / 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 #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 static int usb_pcwd_get_timeleft(struct usb_pcwd_private *usb_pcwd, int *time_left)
321 {
322         unsigned char msb, lsb;
323
324         /* Read the time that's left before rebooting */
325         /* Note: if the board is not yet armed then we will read 0xFFFF */
326         usb_pcwd_send_command(usb_pcwd, CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
327
328         *time_left = (msb << 8) + lsb;
329
330         return 0;
331 }
332
333 /*
334  *      /dev/watchdog handling
335  */
336
337 static ssize_t usb_pcwd_write(struct file *file, const char __user *data,
338                               size_t len, loff_t *ppos)
339 {
340         /* See if we got the magic character 'V' and reload the timer */
341         if (len) {
342                 if (!nowayout) {
343                         size_t i;
344
345                         /* note: just in case someone wrote the magic character
346                          * five months ago... */
347                         expect_release = 0;
348
349                         /* scan to see whether or not we got the magic character */
350                         for (i = 0; i != len; i++) {
351                                 char c;
352                                 if(get_user(c, data+i))
353                                         return -EFAULT;
354                                 if (c == 'V')
355                                         expect_release = 42;
356                         }
357                 }
358
359                 /* someone wrote to us, we should reload the timer */
360                 usb_pcwd_keepalive(usb_pcwd_device);
361         }
362         return len;
363 }
364
365 static int usb_pcwd_ioctl(struct inode *inode, struct file *file,
366                           unsigned int cmd, unsigned long arg)
367 {
368         void __user *argp = (void __user *)arg;
369         int __user *p = argp;
370         static struct watchdog_info ident = {
371                 .options =              WDIOF_KEEPALIVEPING |
372                                         WDIOF_SETTIMEOUT |
373                                         WDIOF_MAGICCLOSE,
374                 .firmware_version =     1,
375                 .identity =             DRIVER_NAME,
376         };
377
378         switch (cmd) {
379                 case WDIOC_GETSUPPORT:
380                         return copy_to_user(argp, &ident,
381                                 sizeof (ident)) ? -EFAULT : 0;
382
383                 case WDIOC_GETSTATUS:
384                 case WDIOC_GETBOOTSTATUS:
385                         return put_user(0, p);
386
387                 case WDIOC_GETTEMP:
388                 {
389                         int temperature;
390
391                         if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
392                                 return -EFAULT;
393
394                         return put_user(temperature, p);
395                 }
396
397                 case WDIOC_KEEPALIVE:
398                         usb_pcwd_keepalive(usb_pcwd_device);
399                         return 0;
400
401                 case WDIOC_SETOPTIONS:
402                 {
403                         int new_options, retval = -EINVAL;
404
405                         if (get_user (new_options, p))
406                                 return -EFAULT;
407
408                         if (new_options & WDIOS_DISABLECARD) {
409                                 usb_pcwd_stop(usb_pcwd_device);
410                                 retval = 0;
411                         }
412
413                         if (new_options & WDIOS_ENABLECARD) {
414                                 usb_pcwd_start(usb_pcwd_device);
415                                 retval = 0;
416                         }
417
418                         return retval;
419                 }
420
421                 case WDIOC_SETTIMEOUT:
422                 {
423                         int new_heartbeat;
424
425                         if (get_user(new_heartbeat, p))
426                                 return -EFAULT;
427
428                         if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat))
429                             return -EINVAL;
430
431                         usb_pcwd_keepalive(usb_pcwd_device);
432                         /* Fall */
433                 }
434
435                 case WDIOC_GETTIMEOUT:
436                         return put_user(heartbeat, p);
437
438                 case WDIOC_GETTIMELEFT:
439                 {
440                         int time_left;
441
442                         if (usb_pcwd_get_timeleft(usb_pcwd_device, &time_left))
443                                 return -EFAULT;
444
445                         return put_user(time_left, p);
446                 }
447
448                 default:
449                         return -ENOIOCTLCMD;
450         }
451 }
452
453 static int usb_pcwd_open(struct inode *inode, struct file *file)
454 {
455         /* /dev/watchdog can only be opened once */
456         if (test_and_set_bit(0, &is_active))
457                 return -EBUSY;
458
459         /* Activate */
460         usb_pcwd_start(usb_pcwd_device);
461         usb_pcwd_keepalive(usb_pcwd_device);
462         return nonseekable_open(inode, file);
463 }
464
465 static int usb_pcwd_release(struct inode *inode, struct file *file)
466 {
467         /*
468          *      Shut off the timer.
469          */
470         if (expect_release == 42) {
471                 usb_pcwd_stop(usb_pcwd_device);
472         } else {
473                 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
474                 usb_pcwd_keepalive(usb_pcwd_device);
475         }
476         expect_release = 0;
477         clear_bit(0, &is_active);
478         return 0;
479 }
480
481 /*
482  *      /dev/temperature handling
483  */
484
485 static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data,
486                                 size_t len, loff_t *ppos)
487 {
488         int temperature;
489
490         if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
491                 return -EFAULT;
492
493         if (copy_to_user(data, &temperature, 1))
494                 return -EFAULT;
495
496         return 1;
497 }
498
499 static int usb_pcwd_temperature_open(struct inode *inode, struct file *file)
500 {
501         return nonseekable_open(inode, file);
502 }
503
504 static int usb_pcwd_temperature_release(struct inode *inode, struct file *file)
505 {
506         return 0;
507 }
508
509 /*
510  *      Notify system
511  */
512
513 static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
514 {
515         if (code==SYS_DOWN || code==SYS_HALT) {
516                 /* Turn the WDT off */
517                 usb_pcwd_stop(usb_pcwd_device);
518         }
519
520         return NOTIFY_DONE;
521 }
522
523 /*
524  *      Kernel Interfaces
525  */
526
527 static struct file_operations usb_pcwd_fops = {
528         .owner =        THIS_MODULE,
529         .llseek =       no_llseek,
530         .write =        usb_pcwd_write,
531         .ioctl =        usb_pcwd_ioctl,
532         .open =         usb_pcwd_open,
533         .release =      usb_pcwd_release,
534 };
535
536 static struct miscdevice usb_pcwd_miscdev = {
537         .minor =        WATCHDOG_MINOR,
538         .name =         "watchdog",
539         .fops =         &usb_pcwd_fops,
540 };
541
542 static struct file_operations usb_pcwd_temperature_fops = {
543         .owner =        THIS_MODULE,
544         .llseek =       no_llseek,
545         .read =         usb_pcwd_temperature_read,
546         .open =         usb_pcwd_temperature_open,
547         .release =      usb_pcwd_temperature_release,
548 };
549
550 static struct miscdevice usb_pcwd_temperature_miscdev = {
551         .minor =        TEMP_MINOR,
552         .name =         "temperature",
553         .fops =         &usb_pcwd_temperature_fops,
554 };
555
556 static struct notifier_block usb_pcwd_notifier = {
557         .notifier_call =        usb_pcwd_notify_sys,
558 };
559
560 /**
561  *      usb_pcwd_delete
562  */
563 static inline void usb_pcwd_delete (struct usb_pcwd_private *usb_pcwd)
564 {
565         if (usb_pcwd->intr_urb != NULL)
566                 usb_free_urb (usb_pcwd->intr_urb);
567         if (usb_pcwd->intr_buffer != NULL)
568                 usb_buffer_free(usb_pcwd->udev, usb_pcwd->intr_size,
569                                 usb_pcwd->intr_buffer, usb_pcwd->intr_dma);
570         kfree (usb_pcwd);
571 }
572
573 /**
574  *      usb_pcwd_probe
575  *
576  *      Called by the usb core when a new device is connected that it thinks
577  *      this driver might be interested in.
578  */
579 static int usb_pcwd_probe(struct usb_interface *interface, const struct usb_device_id *id)
580 {
581         struct usb_device *udev = interface_to_usbdev(interface);
582         struct usb_host_interface *iface_desc;
583         struct usb_endpoint_descriptor *endpoint;
584         struct usb_pcwd_private *usb_pcwd = NULL;
585         int pipe, maxp;
586         int retval = -ENOMEM;
587         int got_fw_rev;
588         unsigned char fw_rev_major, fw_rev_minor;
589         char fw_ver_str[20];
590         unsigned char option_switches, dummy;
591
592         cards_found++;
593         if (cards_found > 1) {
594                 printk(KERN_ERR PFX "This driver only supports 1 device\n");
595                 return -ENODEV;
596         }
597
598         /* get the active interface descriptor */
599         iface_desc = interface->cur_altsetting;
600
601         /* check out that we have a HID device */
602         if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) {
603                 printk(KERN_ERR PFX "The device isn't a Human Interface Device\n");
604                 return -ENODEV;
605         }
606
607         /* check out the endpoint: it has to be Interrupt & IN */
608         endpoint = &iface_desc->endpoint[0].desc;
609
610         if (!((endpoint->bEndpointAddress & USB_DIR_IN) &&
611              ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
612                                 == USB_ENDPOINT_XFER_INT))) {
613                 /* we didn't find a Interrupt endpoint with direction IN */
614                 printk(KERN_ERR PFX "Couldn't find an INTR & IN endpoint\n");
615                 return -ENODEV;
616         }
617
618         /* get a handle to the interrupt data pipe */
619         pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
620         maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
621
622         /* allocate memory for our device and initialize it */
623         usb_pcwd = kmalloc (sizeof(struct usb_pcwd_private), GFP_KERNEL);
624         if (usb_pcwd == NULL) {
625                 printk(KERN_ERR PFX "Out of memory\n");
626                 goto error;
627         }
628         memset (usb_pcwd, 0x00, sizeof (*usb_pcwd));
629
630         usb_pcwd_device = usb_pcwd;
631
632         init_MUTEX (&usb_pcwd->sem);
633         usb_pcwd->udev = udev;
634         usb_pcwd->interface = interface;
635         usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber;
636         usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ? le16_to_cpu(endpoint->wMaxPacketSize) : 8);
637
638         /* set up the memory buffer's */
639         if (!(usb_pcwd->intr_buffer = usb_buffer_alloc(udev, usb_pcwd->intr_size, SLAB_ATOMIC, &usb_pcwd->intr_dma))) {
640                 printk(KERN_ERR PFX "Out of memory\n");
641                 goto error;
642         }
643
644         /* allocate the urb's */
645         usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
646         if (!usb_pcwd->intr_urb) {
647                 printk(KERN_ERR PFX "Out of memory\n");
648                 goto error;
649         }
650
651         /* initialise the intr urb's */
652         usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe,
653                         usb_pcwd->intr_buffer, usb_pcwd->intr_size,
654                         usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval);
655         usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma;
656         usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
657
658         /* register our interrupt URB with the USB system */
659         if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) {
660                 printk(KERN_ERR PFX "Problem registering interrupt URB\n");
661                 retval = -EIO; /* failure */
662                 goto error;
663         }
664
665         /* The device exists and can be communicated with */
666         usb_pcwd->exists = 1;
667
668         /* disable card */
669         usb_pcwd_stop(usb_pcwd);
670
671         /* Get the Firmware Version */
672         got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor);
673         if (got_fw_rev) {
674                 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
675         } else {
676                 sprintf(fw_ver_str, "<card no answer>");
677         }
678
679         printk(KERN_INFO PFX "Found card (Firmware: %s) with temp option\n",
680                 fw_ver_str);
681
682         /* Get switch settings */
683         usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy, &option_switches);
684
685         printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
686                 option_switches,
687                 ((option_switches & 0x10) ? "ON" : "OFF"),
688                 ((option_switches & 0x08) ? "ON" : "OFF"));
689
690         /* Check that the heartbeat value is within it's range ; if not reset to the default */
691         if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) {
692                 usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT);
693                 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
694                         WATCHDOG_HEARTBEAT);
695         }
696
697         retval = register_reboot_notifier(&usb_pcwd_notifier);
698         if (retval != 0) {
699                 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
700                         retval);
701                 goto error;
702         }
703
704         retval = misc_register(&usb_pcwd_temperature_miscdev);
705         if (retval != 0) {
706                 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
707                         TEMP_MINOR, retval);
708                 goto err_out_unregister_reboot;
709         }
710
711         retval = misc_register(&usb_pcwd_miscdev);
712         if (retval != 0) {
713                 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
714                         WATCHDOG_MINOR, retval);
715                 goto err_out_misc_deregister;
716         }
717
718         /* we can register the device now, as it is ready */
719         usb_set_intfdata (interface, usb_pcwd);
720
721         printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
722                 heartbeat, nowayout);
723
724         return 0;
725
726 err_out_misc_deregister:
727         misc_deregister(&usb_pcwd_temperature_miscdev);
728 err_out_unregister_reboot:
729         unregister_reboot_notifier(&usb_pcwd_notifier);
730 error:
731         if (usb_pcwd)
732                 usb_pcwd_delete(usb_pcwd);
733         usb_pcwd_device = NULL;
734         return retval;
735 }
736
737
738 /**
739  *      usb_pcwd_disconnect
740  *
741  *      Called by the usb core when the device is removed from the system.
742  *
743  *      This routine guarantees that the driver will not submit any more urbs
744  *      by clearing dev->udev.
745  */
746 static void usb_pcwd_disconnect(struct usb_interface *interface)
747 {
748         struct usb_pcwd_private *usb_pcwd;
749
750         /* prevent races with open() */
751         mutex_lock(&disconnect_mutex);
752
753         usb_pcwd = usb_get_intfdata (interface);
754         usb_set_intfdata (interface, NULL);
755
756         down (&usb_pcwd->sem);
757
758         /* Stop the timer before we leave */
759         if (!nowayout)
760                 usb_pcwd_stop(usb_pcwd);
761
762         /* We should now stop communicating with the USB PCWD device */
763         usb_pcwd->exists = 0;
764
765         /* Deregister */
766         misc_deregister(&usb_pcwd_miscdev);
767         misc_deregister(&usb_pcwd_temperature_miscdev);
768         unregister_reboot_notifier(&usb_pcwd_notifier);
769
770         up (&usb_pcwd->sem);
771
772         /* Delete the USB PCWD device */
773         usb_pcwd_delete(usb_pcwd);
774
775         cards_found--;
776
777         mutex_unlock(&disconnect_mutex);
778
779         printk(KERN_INFO PFX "USB PC Watchdog disconnected\n");
780 }
781
782
783
784 /**
785  *      usb_pcwd_init
786  */
787 static int __init usb_pcwd_init(void)
788 {
789         int result;
790
791         /* register this driver with the USB subsystem */
792         result = usb_register(&usb_pcwd_driver);
793         if (result) {
794                 printk(KERN_ERR PFX "usb_register failed. Error number %d\n",
795                     result);
796                 return result;
797         }
798
799         printk(KERN_INFO PFX DRIVER_DESC " v" DRIVER_VERSION " (" DRIVER_DATE ")\n");
800         return 0;
801 }
802
803
804 /**
805  *      usb_pcwd_exit
806  */
807 static void __exit usb_pcwd_exit(void)
808 {
809         /* deregister this driver with the USB subsystem */
810         usb_deregister(&usb_pcwd_driver);
811 }
812
813
814 module_init (usb_pcwd_init);
815 module_exit (usb_pcwd_exit);