8c582bc0588ebc2f62f4ac63270c2b7cbf19603e
[linux-2.6.git] / drivers / watchdog / pcwd_usb.c
1 /*
2  *      Berkshire USB-PC Watchdog Card Driver
3  *
4  *      (c) Copyright 2004-2007 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/module.h>       /* For module specific items */
28 #include <linux/moduleparam.h>  /* For new moduleparam's */
29 #include <linux/types.h>        /* For standard types (like size_t) */
30 #include <linux/errno.h>        /* For the -ENODEV/... values */
31 #include <linux/kernel.h>       /* For printk/panic/... */
32 #include <linux/delay.h>        /* For mdelay function */
33 #include <linux/miscdevice.h>   /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */
34 #include <linux/watchdog.h>     /* For the watchdog specific items */
35 #include <linux/notifier.h>     /* For notifier support */
36 #include <linux/reboot.h>       /* For reboot_notifier stuff */
37 #include <linux/init.h>         /* For __init/__exit/... */
38 #include <linux/fs.h>           /* For file operations */
39 #include <linux/usb.h>          /* For USB functions */
40 #include <linux/slab.h>         /* For kmalloc, ... */
41 #include <linux/mutex.h>        /* For mutex locking */
42 #include <linux/hid.h>          /* For HID_REQ_SET_REPORT & HID_DT_REPORT */
43 #include <linux/uaccess.h>      /* For copy_to_user/put_user/... */
44
45
46 #ifdef CONFIG_USB_DEBUG
47         static int debug = 1;
48 #else
49         static int debug;
50 #endif
51
52 /* Use our own dbg macro */
53 #undef dbg
54 #define dbg(format, arg...) do { if (debug) printk(KERN_DEBUG PFX format "\n" , ## arg); } while (0)
55
56
57 /* Module and Version Information */
58 #define DRIVER_VERSION "1.02"
59 #define DRIVER_DATE "21 Jan 2007"
60 #define DRIVER_AUTHOR "Wim Van Sebroeck <wim@iguana.be>"
61 #define DRIVER_DESC "Berkshire USB-PC Watchdog driver"
62 #define DRIVER_LICENSE "GPL"
63 #define DRIVER_NAME "pcwd_usb"
64 #define PFX DRIVER_NAME ": "
65
66 MODULE_AUTHOR(DRIVER_AUTHOR);
67 MODULE_DESCRIPTION(DRIVER_DESC);
68 MODULE_LICENSE(DRIVER_LICENSE);
69 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
70 MODULE_ALIAS_MISCDEV(TEMP_MINOR);
71
72 /* Module Parameters */
73 module_param(debug, int, 0);
74 MODULE_PARM_DESC(debug, "Debug enabled or not");
75
76 #define WATCHDOG_HEARTBEAT 0    /* default heartbeat = delay-time from dip-switches */
77 static int heartbeat = WATCHDOG_HEARTBEAT;
78 module_param(heartbeat, int, 0);
79 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536 or 0=delay-time from dip-switches, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
80
81 static int nowayout = WATCHDOG_NOWAYOUT;
82 module_param(nowayout, int, 0);
83 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
84
85 /* The vendor and product id's for the USB-PC Watchdog card */
86 #define USB_PCWD_VENDOR_ID      0x0c98
87 #define USB_PCWD_PRODUCT_ID     0x1140
88
89 /* table of devices that work with this driver */
90 static struct usb_device_id usb_pcwd_table [] = {
91         { USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) },
92         { }                                     /* Terminating entry */
93 };
94 MODULE_DEVICE_TABLE (usb, usb_pcwd_table);
95
96 /* according to documentation max. time to process a command for the USB
97  * watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */
98 #define USB_COMMAND_TIMEOUT     250
99
100 /* Watchdog's internal commands */
101 #define CMD_READ_TEMP                   0x02    /* Read Temperature; Re-trigger Watchdog */
102 #define CMD_TRIGGER                     CMD_READ_TEMP
103 #define CMD_GET_STATUS                  0x04    /* Get Status Information */
104 #define CMD_GET_FIRMWARE_VERSION        0x08    /* Get Firmware Version */
105 #define CMD_GET_DIP_SWITCH_SETTINGS     0x0c    /* Get Dip Switch Settings */
106 #define CMD_READ_WATCHDOG_TIMEOUT       0x18    /* Read Current Watchdog Time */
107 #define CMD_WRITE_WATCHDOG_TIMEOUT      0x19    /* Write Current Watchdog Time */
108 #define CMD_ENABLE_WATCHDOG             0x30    /* Enable / Disable Watchdog */
109 #define CMD_DISABLE_WATCHDOG            CMD_ENABLE_WATCHDOG
110
111 /* Watchdog's Dip Switch heartbeat values */
112 static const int heartbeat_tbl [] = {
113         5,      /* OFF-OFF-OFF  =  5 Sec  */
114         10,     /* OFF-OFF-ON   = 10 Sec  */
115         30,     /* OFF-ON-OFF   = 30 Sec  */
116         60,     /* OFF-ON-ON    =  1 Min  */
117         300,    /* ON-OFF-OFF   =  5 Min  */
118         600,    /* ON-OFF-ON    = 10 Min  */
119         1800,   /* ON-ON-OFF    = 30 Min  */
120         3600,   /* ON-ON-ON     =  1 hour */
121 };
122
123 /* We can only use 1 card due to the /dev/watchdog restriction */
124 static int cards_found;
125
126 /* some internal variables */
127 static unsigned long is_active;
128 static char expect_release;
129
130 /* Structure to hold all of our device specific stuff */
131 struct usb_pcwd_private {
132         struct usb_device *     udev;                   /* save off the usb device pointer */
133         struct usb_interface *  interface;              /* the interface for this device */
134
135         unsigned int            interface_number;       /* the interface number used for cmd's */
136
137         unsigned char *         intr_buffer;            /* the buffer to intr data */
138         dma_addr_t              intr_dma;               /* the dma address for the intr buffer */
139         size_t                  intr_size;              /* the size of the intr buffer */
140         struct urb *            intr_urb;               /* the urb used for the intr pipe */
141
142         unsigned char           cmd_command;            /* The command that is reported back */
143         unsigned char           cmd_data_msb;           /* The data MSB that is reported back */
144         unsigned char           cmd_data_lsb;           /* The data LSB that is reported back */
145         atomic_t                cmd_received;           /* true if we received a report after a command */
146
147         int                     exists;                 /* Wether or not the device exists */
148         struct mutex            mtx;                    /* locks this structure */
149 };
150 static struct usb_pcwd_private *usb_pcwd_device;
151
152 /* prevent races between open() and disconnect() */
153 static DEFINE_MUTEX(disconnect_mutex);
154
155 /* local function prototypes */
156 static int usb_pcwd_probe       (struct usb_interface *interface, const struct usb_device_id *id);
157 static void usb_pcwd_disconnect (struct usb_interface *interface);
158
159 /* usb specific object needed to register this driver with the usb subsystem */
160 static struct usb_driver usb_pcwd_driver = {
161         .name =         DRIVER_NAME,
162         .probe =        usb_pcwd_probe,
163         .disconnect =   usb_pcwd_disconnect,
164         .id_table =     usb_pcwd_table,
165 };
166
167
168 static void usb_pcwd_intr_done(struct urb *urb)
169 {
170         struct usb_pcwd_private *usb_pcwd = (struct usb_pcwd_private *)urb->context;
171         unsigned char *data = usb_pcwd->intr_buffer;
172         int retval;
173
174         switch (urb->status) {
175         case 0:                 /* success */
176                 break;
177         case -ECONNRESET:       /* unlink */
178         case -ENOENT:
179         case -ESHUTDOWN:
180                 /* this urb is terminated, clean up */
181                 dbg("%s - urb shutting down with status: %d", __func__, urb->status);
182                 return;
183         /* -EPIPE:  should clear the halt */
184         default:                /* error */
185                 dbg("%s - nonzero urb status received: %d", __func__, urb->status);
186                 goto resubmit;
187         }
188
189         dbg("received following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
190                 data[0], data[1], data[2]);
191
192         usb_pcwd->cmd_command  = data[0];
193         usb_pcwd->cmd_data_msb = data[1];
194         usb_pcwd->cmd_data_lsb = data[2];
195
196         /* notify anyone waiting that the cmd has finished */
197         atomic_set (&usb_pcwd->cmd_received, 1);
198
199 resubmit:
200         retval = usb_submit_urb (urb, GFP_ATOMIC);
201         if (retval)
202                 printk(KERN_ERR PFX "can't resubmit intr, usb_submit_urb failed with result %d\n",
203                         retval);
204 }
205
206 static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd, unsigned char cmd,
207         unsigned char *msb, unsigned char *lsb)
208 {
209         int got_response, count;
210         unsigned char buf[6];
211
212         /* We will not send any commands if the USB PCWD device does not exist */
213         if ((!usb_pcwd) || (!usb_pcwd->exists))
214                 return -1;
215
216         /* The USB PC Watchdog uses a 6 byte report format. The board currently uses
217          * only 3 of the six bytes of the report. */
218         buf[0] = cmd;                   /* Byte 0 = CMD */
219         buf[1] = *msb;                  /* Byte 1 = Data MSB */
220         buf[2] = *lsb;                  /* Byte 2 = Data LSB */
221         buf[3] = buf[4] = buf[5] = 0;   /* All other bytes not used */
222
223         dbg("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
224                 buf[0], buf[1], buf[2]);
225
226         atomic_set (&usb_pcwd->cmd_received, 0);
227
228         if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0),
229                         HID_REQ_SET_REPORT, HID_DT_REPORT,
230                         0x0200, usb_pcwd->interface_number, buf, sizeof(buf),
231                         USB_COMMAND_TIMEOUT) != sizeof(buf)) {
232                 dbg("usb_pcwd_send_command: error in usb_control_msg for cmd 0x%x 0x%x 0x%x\n", cmd, *msb, *lsb);
233         }
234         /* wait till the usb card processed the command,
235          * with a max. timeout of USB_COMMAND_TIMEOUT */
236         got_response = 0;
237         for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response); count++) {
238                 mdelay(1);
239                 if (atomic_read (&usb_pcwd->cmd_received))
240                         got_response = 1;
241         }
242
243         if ((got_response) && (cmd == usb_pcwd->cmd_command)) {
244                 /* read back response */
245                 *msb = usb_pcwd->cmd_data_msb;
246                 *lsb = usb_pcwd->cmd_data_lsb;
247         }
248
249         return got_response;
250 }
251
252 static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd)
253 {
254         unsigned char msb = 0x00;
255         unsigned char lsb = 0x00;
256         int retval;
257
258         /* Enable Watchdog */
259         retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG, &msb, &lsb);
260
261         if ((retval == 0) || (lsb == 0)) {
262                 printk(KERN_ERR PFX "Card did not acknowledge enable attempt\n");
263                 return -1;
264         }
265
266         return 0;
267 }
268
269 static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd)
270 {
271         unsigned char msb = 0xA5;
272         unsigned char lsb = 0xC3;
273         int retval;
274
275         /* Disable Watchdog */
276         retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG, &msb, &lsb);
277
278         if ((retval == 0) || (lsb != 0)) {
279                 printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n");
280                 return -1;
281         }
282
283         return 0;
284 }
285
286 static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd)
287 {
288         unsigned char dummy;
289
290         /* Re-trigger Watchdog */
291         usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy);
292
293         return 0;
294 }
295
296 static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t)
297 {
298         unsigned char msb = t / 256;
299         unsigned char lsb = t % 256;
300
301         if ((t < 0x0001) || (t > 0xFFFF))
302                 return -EINVAL;
303
304         /* Write new heartbeat to watchdog */
305         usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb);
306
307         heartbeat = t;
308         return 0;
309 }
310
311 static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd, int *temperature)
312 {
313         unsigned char msb, lsb;
314
315         usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb);
316
317         /*
318          * Convert celsius to fahrenheit, since this was
319          * the decided 'standard' for this return value.
320          */
321         *temperature = (lsb * 9 / 5) + 32;
322
323         return 0;
324 }
325
326 static int usb_pcwd_get_timeleft(struct usb_pcwd_private *usb_pcwd, int *time_left)
327 {
328         unsigned char msb, lsb;
329
330         /* Read the time that's left before rebooting */
331         /* Note: if the board is not yet armed then we will read 0xFFFF */
332         usb_pcwd_send_command(usb_pcwd, CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
333
334         *time_left = (msb << 8) + lsb;
335
336         return 0;
337 }
338
339 /*
340  *      /dev/watchdog handling
341  */
342
343 static ssize_t usb_pcwd_write(struct file *file, const char __user *data,
344                               size_t len, loff_t *ppos)
345 {
346         /* See if we got the magic character 'V' and reload the timer */
347         if (len) {
348                 if (!nowayout) {
349                         size_t i;
350
351                         /* note: just in case someone wrote the magic character
352                          * five months ago... */
353                         expect_release = 0;
354
355                         /* scan to see whether or not we got the magic character */
356                         for (i = 0; i != len; i++) {
357                                 char c;
358                                 if(get_user(c, data+i))
359                                         return -EFAULT;
360                                 if (c == 'V')
361                                         expect_release = 42;
362                         }
363                 }
364
365                 /* someone wrote to us, we should reload the timer */
366                 usb_pcwd_keepalive(usb_pcwd_device);
367         }
368         return len;
369 }
370
371 static long usb_pcwd_ioctl(struct file *file, unsigned int cmd,
372                                                 unsigned long arg)
373 {
374         void __user *argp = (void __user *)arg;
375         int __user *p = argp;
376         static struct watchdog_info ident = {
377                 .options =              WDIOF_KEEPALIVEPING |
378                                         WDIOF_SETTIMEOUT |
379                                         WDIOF_MAGICCLOSE,
380                 .firmware_version =     1,
381                 .identity =             DRIVER_NAME,
382         };
383
384         switch (cmd) {
385         case WDIOC_GETSUPPORT:
386                 return copy_to_user(argp, &ident,
387                         sizeof (ident)) ? -EFAULT : 0;
388
389         case WDIOC_GETSTATUS:
390         case WDIOC_GETBOOTSTATUS:
391                 return put_user(0, p);
392
393         case WDIOC_GETTEMP:
394         {
395                 int temperature;
396
397                 if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
398                         return -EFAULT;
399
400                 return put_user(temperature, p);
401         }
402
403         case WDIOC_SETOPTIONS:
404         {
405                 int new_options, retval = -EINVAL;
406
407                 if (get_user (new_options, p))
408                         return -EFAULT;
409
410                 if (new_options & WDIOS_DISABLECARD) {
411                         usb_pcwd_stop(usb_pcwd_device);
412                         retval = 0;
413                 }
414
415                 if (new_options & WDIOS_ENABLECARD) {
416                         usb_pcwd_start(usb_pcwd_device);
417                         retval = 0;
418                 }
419
420                 return retval;
421         }
422
423         case WDIOC_KEEPALIVE:
424                 usb_pcwd_keepalive(usb_pcwd_device);
425                 return 0;
426
427         case WDIOC_SETTIMEOUT:
428         {
429                 int new_heartbeat;
430
431                 if (get_user(new_heartbeat, p))
432                         return -EFAULT;
433
434                 if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat))
435                     return -EINVAL;
436
437                 usb_pcwd_keepalive(usb_pcwd_device);
438                 /* Fall */
439         }
440
441         case WDIOC_GETTIMEOUT:
442                 return put_user(heartbeat, p);
443
444         case WDIOC_GETTIMELEFT:
445         {
446                 int time_left;
447
448                 if (usb_pcwd_get_timeleft(usb_pcwd_device, &time_left))
449                         return -EFAULT;
450
451                 return put_user(time_left, p);
452         }
453
454         default:
455                 return -ENOTTY;
456         }
457 }
458
459 static int usb_pcwd_open(struct inode *inode, struct file *file)
460 {
461         /* /dev/watchdog can only be opened once */
462         if (test_and_set_bit(0, &is_active))
463                 return -EBUSY;
464
465         /* Activate */
466         usb_pcwd_start(usb_pcwd_device);
467         usb_pcwd_keepalive(usb_pcwd_device);
468         return nonseekable_open(inode, file);
469 }
470
471 static int usb_pcwd_release(struct inode *inode, struct file *file)
472 {
473         /*
474          *      Shut off the timer.
475          */
476         if (expect_release == 42) {
477                 usb_pcwd_stop(usb_pcwd_device);
478         } else {
479                 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
480                 usb_pcwd_keepalive(usb_pcwd_device);
481         }
482         expect_release = 0;
483         clear_bit(0, &is_active);
484         return 0;
485 }
486
487 /*
488  *      /dev/temperature handling
489  */
490
491 static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data,
492                                 size_t len, loff_t *ppos)
493 {
494         int temperature;
495
496         if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
497                 return -EFAULT;
498
499         if (copy_to_user(data, &temperature, 1))
500                 return -EFAULT;
501
502         return 1;
503 }
504
505 static int usb_pcwd_temperature_open(struct inode *inode, struct file *file)
506 {
507         return nonseekable_open(inode, file);
508 }
509
510 static int usb_pcwd_temperature_release(struct inode *inode, struct file *file)
511 {
512         return 0;
513 }
514
515 /*
516  *      Notify system
517  */
518
519 static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
520 {
521         if (code==SYS_DOWN || code==SYS_HALT) {
522                 /* Turn the WDT off */
523                 usb_pcwd_stop(usb_pcwd_device);
524         }
525
526         return NOTIFY_DONE;
527 }
528
529 /*
530  *      Kernel Interfaces
531  */
532
533 static const struct file_operations usb_pcwd_fops = {
534         .owner =        THIS_MODULE,
535         .llseek =       no_llseek,
536         .write =        usb_pcwd_write,
537         .unlocked_ioctl = usb_pcwd_ioctl,
538         .open =         usb_pcwd_open,
539         .release =      usb_pcwd_release,
540 };
541
542 static struct miscdevice usb_pcwd_miscdev = {
543         .minor =        WATCHDOG_MINOR,
544         .name =         "watchdog",
545         .fops =         &usb_pcwd_fops,
546 };
547
548 static const struct file_operations usb_pcwd_temperature_fops = {
549         .owner =        THIS_MODULE,
550         .llseek =       no_llseek,
551         .read =         usb_pcwd_temperature_read,
552         .open =         usb_pcwd_temperature_open,
553         .release =      usb_pcwd_temperature_release,
554 };
555
556 static struct miscdevice usb_pcwd_temperature_miscdev = {
557         .minor =        TEMP_MINOR,
558         .name =         "temperature",
559         .fops =         &usb_pcwd_temperature_fops,
560 };
561
562 static struct notifier_block usb_pcwd_notifier = {
563         .notifier_call =        usb_pcwd_notify_sys,
564 };
565
566 /**
567  *      usb_pcwd_delete
568  */
569 static inline void usb_pcwd_delete (struct usb_pcwd_private *usb_pcwd)
570 {
571         usb_free_urb(usb_pcwd->intr_urb);
572         if (usb_pcwd->intr_buffer != NULL)
573                 usb_buffer_free(usb_pcwd->udev, usb_pcwd->intr_size,
574                                 usb_pcwd->intr_buffer, usb_pcwd->intr_dma);
575         kfree (usb_pcwd);
576 }
577
578 /**
579  *      usb_pcwd_probe
580  *
581  *      Called by the usb core when a new device is connected that it thinks
582  *      this driver might be interested in.
583  */
584 static int usb_pcwd_probe(struct usb_interface *interface, const struct usb_device_id *id)
585 {
586         struct usb_device *udev = interface_to_usbdev(interface);
587         struct usb_host_interface *iface_desc;
588         struct usb_endpoint_descriptor *endpoint;
589         struct usb_pcwd_private *usb_pcwd = NULL;
590         int pipe, maxp;
591         int retval = -ENOMEM;
592         int got_fw_rev;
593         unsigned char fw_rev_major, fw_rev_minor;
594         char fw_ver_str[20];
595         unsigned char option_switches, dummy;
596
597         cards_found++;
598         if (cards_found > 1) {
599                 printk(KERN_ERR PFX "This driver only supports 1 device\n");
600                 return -ENODEV;
601         }
602
603         /* get the active interface descriptor */
604         iface_desc = interface->cur_altsetting;
605
606         /* check out that we have a HID device */
607         if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) {
608                 printk(KERN_ERR PFX "The device isn't a Human Interface Device\n");
609                 return -ENODEV;
610         }
611
612         /* check out the endpoint: it has to be Interrupt & IN */
613         endpoint = &iface_desc->endpoint[0].desc;
614
615         if (!((endpoint->bEndpointAddress & USB_DIR_IN) &&
616              ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
617                                 == USB_ENDPOINT_XFER_INT))) {
618                 /* we didn't find a Interrupt endpoint with direction IN */
619                 printk(KERN_ERR PFX "Couldn't find an INTR & IN endpoint\n");
620                 return -ENODEV;
621         }
622
623         /* get a handle to the interrupt data pipe */
624         pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
625         maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
626
627         /* allocate memory for our device and initialize it */
628         usb_pcwd = kzalloc (sizeof(struct usb_pcwd_private), GFP_KERNEL);
629         if (usb_pcwd == NULL) {
630                 printk(KERN_ERR PFX "Out of memory\n");
631                 goto error;
632         }
633
634         usb_pcwd_device = usb_pcwd;
635
636         mutex_init(&usb_pcwd->mtx);
637         usb_pcwd->udev = udev;
638         usb_pcwd->interface = interface;
639         usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber;
640         usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ? le16_to_cpu(endpoint->wMaxPacketSize) : 8);
641
642         /* set up the memory buffer's */
643         if (!(usb_pcwd->intr_buffer = usb_buffer_alloc(udev, usb_pcwd->intr_size, GFP_ATOMIC, &usb_pcwd->intr_dma))) {
644                 printk(KERN_ERR PFX "Out of memory\n");
645                 goto error;
646         }
647
648         /* allocate the urb's */
649         usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
650         if (!usb_pcwd->intr_urb) {
651                 printk(KERN_ERR PFX "Out of memory\n");
652                 goto error;
653         }
654
655         /* initialise the intr urb's */
656         usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe,
657                         usb_pcwd->intr_buffer, usb_pcwd->intr_size,
658                         usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval);
659         usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma;
660         usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
661
662         /* register our interrupt URB with the USB system */
663         if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) {
664                 printk(KERN_ERR PFX "Problem registering interrupt URB\n");
665                 retval = -EIO; /* failure */
666                 goto error;
667         }
668
669         /* The device exists and can be communicated with */
670         usb_pcwd->exists = 1;
671
672         /* disable card */
673         usb_pcwd_stop(usb_pcwd);
674
675         /* Get the Firmware Version */
676         got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor);
677         if (got_fw_rev) {
678                 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
679         } else {
680                 sprintf(fw_ver_str, "<card no answer>");
681         }
682
683         printk(KERN_INFO PFX "Found card (Firmware: %s) with temp option\n",
684                 fw_ver_str);
685
686         /* Get switch settings */
687         usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy, &option_switches);
688
689         printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
690                 option_switches,
691                 ((option_switches & 0x10) ? "ON" : "OFF"),
692                 ((option_switches & 0x08) ? "ON" : "OFF"));
693
694         /* If heartbeat = 0 then we use the heartbeat from the dip-switches */
695         if (heartbeat == 0)
696                 heartbeat = heartbeat_tbl[(option_switches & 0x07)];
697
698         /* Check that the heartbeat value is within it's range ; if not reset to the default */
699         if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) {
700                 usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT);
701                 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
702                         WATCHDOG_HEARTBEAT);
703         }
704
705         retval = register_reboot_notifier(&usb_pcwd_notifier);
706         if (retval != 0) {
707                 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
708                         retval);
709                 goto error;
710         }
711
712         retval = misc_register(&usb_pcwd_temperature_miscdev);
713         if (retval != 0) {
714                 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
715                         TEMP_MINOR, retval);
716                 goto err_out_unregister_reboot;
717         }
718
719         retval = misc_register(&usb_pcwd_miscdev);
720         if (retval != 0) {
721                 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
722                         WATCHDOG_MINOR, retval);
723                 goto err_out_misc_deregister;
724         }
725
726         /* we can register the device now, as it is ready */
727         usb_set_intfdata (interface, usb_pcwd);
728
729         printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
730                 heartbeat, nowayout);
731
732         return 0;
733
734 err_out_misc_deregister:
735         misc_deregister(&usb_pcwd_temperature_miscdev);
736 err_out_unregister_reboot:
737         unregister_reboot_notifier(&usb_pcwd_notifier);
738 error:
739         if (usb_pcwd)
740                 usb_pcwd_delete(usb_pcwd);
741         usb_pcwd_device = NULL;
742         return retval;
743 }
744
745
746 /**
747  *      usb_pcwd_disconnect
748  *
749  *      Called by the usb core when the device is removed from the system.
750  *
751  *      This routine guarantees that the driver will not submit any more urbs
752  *      by clearing dev->udev.
753  */
754 static void usb_pcwd_disconnect(struct usb_interface *interface)
755 {
756         struct usb_pcwd_private *usb_pcwd;
757
758         /* prevent races with open() */
759         mutex_lock(&disconnect_mutex);
760
761         usb_pcwd = usb_get_intfdata (interface);
762         usb_set_intfdata (interface, NULL);
763
764         mutex_lock(&usb_pcwd->mtx);
765
766         /* Stop the timer before we leave */
767         if (!nowayout)
768                 usb_pcwd_stop(usb_pcwd);
769
770         /* We should now stop communicating with the USB PCWD device */
771         usb_pcwd->exists = 0;
772
773         /* Deregister */
774         misc_deregister(&usb_pcwd_miscdev);
775         misc_deregister(&usb_pcwd_temperature_miscdev);
776         unregister_reboot_notifier(&usb_pcwd_notifier);
777
778         mutex_unlock(&usb_pcwd->mtx);
779
780         /* Delete the USB PCWD device */
781         usb_pcwd_delete(usb_pcwd);
782
783         cards_found--;
784
785         mutex_unlock(&disconnect_mutex);
786
787         printk(KERN_INFO PFX "USB PC Watchdog disconnected\n");
788 }
789
790
791
792 /**
793  *      usb_pcwd_init
794  */
795 static int __init usb_pcwd_init(void)
796 {
797         int result;
798
799         /* register this driver with the USB subsystem */
800         result = usb_register(&usb_pcwd_driver);
801         if (result) {
802                 printk(KERN_ERR PFX "usb_register failed. Error number %d\n",
803                     result);
804                 return result;
805         }
806
807         printk(KERN_INFO PFX DRIVER_DESC " v" DRIVER_VERSION " (" DRIVER_DATE ")\n");
808         return 0;
809 }
810
811
812 /**
813  *      usb_pcwd_exit
814  */
815 static void __exit usb_pcwd_exit(void)
816 {
817         /* deregister this driver with the USB subsystem */
818         usb_deregister(&usb_pcwd_driver);
819 }
820
821
822 module_init (usb_pcwd_init);
823 module_exit (usb_pcwd_exit);