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