[PATCH] USB: remove .owner field from struct usb_driver
[linux-2.6.git] / drivers / char / watchdog / pcwd_usb.c
1 /*
2  *      Berkshire USB-PC Watchdog Card Driver
3  *
4  *      (c) Copyright 2004 Wim Van Sebroeck <wim@iguana.be>.
5  *
6  *      Based on source code of the following authors:
7  *        Ken Hollis <kenji@bitgate.com>,
8  *        Alan Cox <alan@redhat.com>,
9  *        Matt Domsch <Matt_Domsch@dell.com>,
10  *        Rob Radez <rob@osinvestor.com>,
11  *        Greg Kroah-Hartman <greg@kroah.com>
12  *
13  *      This program is free software; you can redistribute it and/or
14  *      modify it under the terms of the GNU General Public License
15  *      as published by the Free Software Foundation; either version
16  *      2 of the License, or (at your option) any later version.
17  *
18  *      Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
19  *      provide warranty for any of this software. This material is
20  *      provided "AS-IS" and at no charge.
21  *
22  *      Thanks also to Simon Machell at Berkshire Products Inc. for
23  *      providing the test hardware. More info is available at
24  *      http://www.berkprod.com/ or http://www.pcwatchdog.com/
25  */
26
27 #include <linux/config.h>
28 #include <linux/kernel.h>
29 #include <linux/errno.h>
30 #include <linux/init.h>
31 #include <linux/slab.h>
32 #include <linux/module.h>
33 #include <linux/moduleparam.h>
34 #include <linux/types.h>
35 #include <linux/delay.h>
36 #include <linux/miscdevice.h>
37 #include <linux/watchdog.h>
38 #include <linux/notifier.h>
39 #include <linux/reboot.h>
40 #include <linux/fs.h>
41 #include <linux/smp_lock.h>
42 #include <linux/completion.h>
43 #include <asm/uaccess.h>
44 #include <linux/usb.h>
45
46
47 #ifdef CONFIG_USB_DEBUG
48         static int debug = 1;
49 #else
50         static int debug;
51 #endif
52
53 /* Use our own dbg macro */
54 #undef dbg
55 #define dbg(format, arg...) do { if (debug) printk(KERN_DEBUG PFX format "\n" , ## arg); } while (0)
56
57
58 /* Module and Version Information */
59 #define DRIVER_VERSION "1.01"
60 #define DRIVER_DATE "15 Mar 2005"
61 #define DRIVER_AUTHOR "Wim Van Sebroeck <wim@iguana.be>"
62 #define DRIVER_DESC "Berkshire USB-PC Watchdog driver"
63 #define DRIVER_LICENSE "GPL"
64 #define DRIVER_NAME "pcwd_usb"
65 #define PFX DRIVER_NAME ": "
66
67 MODULE_AUTHOR(DRIVER_AUTHOR);
68 MODULE_DESCRIPTION(DRIVER_DESC);
69 MODULE_LICENSE(DRIVER_LICENSE);
70 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
71 MODULE_ALIAS_MISCDEV(TEMP_MINOR);
72
73 /* Module Parameters */
74 module_param(debug, int, 0);
75 MODULE_PARM_DESC(debug, "Debug enabled or not");
76
77 #define WATCHDOG_HEARTBEAT 2    /* 2 sec default heartbeat */
78 static int heartbeat = WATCHDOG_HEARTBEAT;
79 module_param(heartbeat, int, 0);
80 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
81
82 static int nowayout = WATCHDOG_NOWAYOUT;
83 module_param(nowayout, int, 0);
84 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
85
86 /* The vendor and product id's for the USB-PC Watchdog card */
87 #define USB_PCWD_VENDOR_ID      0x0c98
88 #define USB_PCWD_PRODUCT_ID     0x1140
89
90 /* table of devices that work with this driver */
91 static struct usb_device_id usb_pcwd_table [] = {
92         { USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) },
93         { }                                     /* Terminating entry */
94 };
95 MODULE_DEVICE_TABLE (usb, usb_pcwd_table);
96
97 /* according to documentation max. time to process a command for the USB
98  * watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */
99 #define USB_COMMAND_TIMEOUT     250
100
101 /* Watchdog's internal commands */
102 #define CMD_READ_TEMP                   0x02    /* Read Temperature; Re-trigger Watchdog */
103 #define CMD_TRIGGER                     CMD_READ_TEMP
104 #define CMD_GET_STATUS                  0x04    /* Get Status Information */
105 #define CMD_GET_FIRMWARE_VERSION        0x08    /* Get Firmware Version */
106 #define CMD_GET_DIP_SWITCH_SETTINGS     0x0c    /* Get Dip Switch Settings */
107 #define CMD_READ_WATCHDOG_TIMEOUT       0x18    /* Read Current Watchdog Time */
108 #define CMD_WRITE_WATCHDOG_TIMEOUT      0x19    /* Write Current Watchdog Time */
109 #define CMD_ENABLE_WATCHDOG             0x30    /* Enable / Disable Watchdog */
110 #define CMD_DISABLE_WATCHDOG            CMD_ENABLE_WATCHDOG
111
112 /* Some defines that I like to be somewhere else like include/linux/usb_hid.h */
113 #define HID_REQ_SET_REPORT              0x09
114 #define HID_DT_REPORT                   (USB_TYPE_CLASS | 0x02)
115
116 /* We can only use 1 card due to the /dev/watchdog restriction */
117 static int cards_found;
118
119 /* some internal variables */
120 static unsigned long is_active;
121 static char expect_release;
122
123 /* Structure to hold all of our device specific stuff */
124 struct usb_pcwd_private {
125         struct usb_device *     udev;                   /* save off the usb device pointer */
126         struct usb_interface *  interface;              /* the interface for this device */
127
128         unsigned int            interface_number;       /* the interface number used for cmd's */
129
130         unsigned char *         intr_buffer;            /* the buffer to intr data */
131         dma_addr_t              intr_dma;               /* the dma address for the intr buffer */
132         size_t                  intr_size;              /* the size of the intr buffer */
133         struct urb *            intr_urb;               /* the urb used for the intr pipe */
134
135         unsigned char           cmd_command;            /* The command that is reported back */
136         unsigned char           cmd_data_msb;           /* The data MSB that is reported back */
137         unsigned char           cmd_data_lsb;           /* The data LSB that is reported back */
138         atomic_t                cmd_received;           /* true if we received a report after a command */
139
140         int                     exists;                 /* Wether or not the device exists */
141         struct semaphore        sem;                    /* locks this structure */
142 };
143 static struct usb_pcwd_private *usb_pcwd_device;
144
145 /* prevent races between open() and disconnect() */
146 static DECLARE_MUTEX (disconnect_sem);
147
148 /* local function prototypes */
149 static int usb_pcwd_probe       (struct usb_interface *interface, const struct usb_device_id *id);
150 static void usb_pcwd_disconnect (struct usb_interface *interface);
151
152 /* usb specific object needed to register this driver with the usb subsystem */
153 static struct usb_driver usb_pcwd_driver = {
154         .name =         DRIVER_NAME,
155         .probe =        usb_pcwd_probe,
156         .disconnect =   usb_pcwd_disconnect,
157         .id_table =     usb_pcwd_table,
158 };
159
160
161 static void usb_pcwd_intr_done(struct urb *urb, struct pt_regs *regs)
162 {
163         struct usb_pcwd_private *usb_pcwd = (struct usb_pcwd_private *)urb->context;
164         unsigned char *data = usb_pcwd->intr_buffer;
165         int retval;
166
167         switch (urb->status) {
168         case 0:                 /* success */
169                 break;
170         case -ECONNRESET:       /* unlink */
171         case -ENOENT:
172         case -ESHUTDOWN:
173                 /* this urb is terminated, clean up */
174                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
175                 return;
176         /* -EPIPE:  should clear the halt */
177         default:                /* error */
178                 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
179                 goto resubmit;
180         }
181
182         dbg("received following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
183                 data[0], data[1], data[2]);
184
185         usb_pcwd->cmd_command  = data[0];
186         usb_pcwd->cmd_data_msb = data[1];
187         usb_pcwd->cmd_data_lsb = data[2];
188
189         /* notify anyone waiting that the cmd has finished */
190         atomic_set (&usb_pcwd->cmd_received, 1);
191
192 resubmit:
193         retval = usb_submit_urb (urb, GFP_ATOMIC);
194         if (retval)
195                 printk(KERN_ERR PFX "can't resubmit intr, usb_submit_urb failed with result %d\n",
196                         retval);
197 }
198
199 static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd, unsigned char cmd,
200         unsigned char *msb, unsigned char *lsb)
201 {
202         int got_response, count;
203         unsigned char buf[6];
204
205         /* We will not send any commands if the USB PCWD device does not exist */
206         if ((!usb_pcwd) || (!usb_pcwd->exists))
207                 return -1;
208
209         /* The USB PC Watchdog uses a 6 byte report format. The board currently uses
210          * only 3 of the six bytes of the report. */
211         buf[0] = cmd;                   /* Byte 0 = CMD */
212         buf[1] = *msb;                  /* Byte 1 = Data MSB */
213         buf[2] = *lsb;                  /* Byte 2 = Data LSB */
214         buf[3] = buf[4] = buf[5] = 0;   /* All other bytes not used */
215
216         dbg("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
217                 buf[0], buf[1], buf[2]);
218
219         atomic_set (&usb_pcwd->cmd_received, 0);
220
221         if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0),
222                         HID_REQ_SET_REPORT, HID_DT_REPORT,
223                         0x0200, usb_pcwd->interface_number, buf, sizeof(buf),
224                         USB_COMMAND_TIMEOUT) != sizeof(buf)) {
225                 dbg("usb_pcwd_send_command: error in usb_control_msg for cmd 0x%x 0x%x 0x%x\n", cmd, *msb, *lsb);
226         }
227         /* wait till the usb card processed the command,
228          * with a max. timeout of USB_COMMAND_TIMEOUT */
229         got_response = 0;
230         for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response); count++) {
231                 mdelay(1);
232                 if (atomic_read (&usb_pcwd->cmd_received))
233                         got_response = 1;
234         }
235
236         if ((got_response) && (cmd == usb_pcwd->cmd_command)) {
237                 /* read back response */
238                 *msb = usb_pcwd->cmd_data_msb;
239                 *lsb = usb_pcwd->cmd_data_lsb;
240         }
241
242         return got_response;
243 }
244
245 static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd)
246 {
247         unsigned char msb = 0x00;
248         unsigned char lsb = 0x00;
249         int retval;
250
251         /* Enable Watchdog */
252         retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG, &msb, &lsb);
253
254         if ((retval == 0) || (lsb == 0)) {
255                 printk(KERN_ERR PFX "Card did not acknowledge enable attempt\n");
256                 return -1;
257         }
258
259         return 0;
260 }
261
262 static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd)
263 {
264         unsigned char msb = 0xA5;
265         unsigned char lsb = 0xC3;
266         int retval;
267
268         /* Disable Watchdog */
269         retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG, &msb, &lsb);
270
271         if ((retval == 0) || (lsb != 0)) {
272                 printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n");
273                 return -1;
274         }
275
276         return 0;
277 }
278
279 static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd)
280 {
281         unsigned char dummy;
282
283         /* Re-trigger Watchdog */
284         usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy);
285
286         return 0;
287 }
288
289 static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t)
290 {
291         unsigned char msb = t / 256;
292         unsigned char lsb = t % 256;
293
294         if ((t < 0x0001) || (t > 0xFFFF))
295                 return -EINVAL;
296
297         /* Write new heartbeat to watchdog */
298         usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb);
299
300         heartbeat = t;
301         return 0;
302 }
303
304 static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd, int *temperature)
305 {
306         unsigned char msb, lsb;
307
308         usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb);
309
310         /*
311          * Convert celsius to fahrenheit, since this was
312          * the decided 'standard' for this return value.
313          */
314         *temperature = (lsb * 9 / 5) + 32;
315
316         return 0;
317 }
318
319 /*
320  *      /dev/watchdog handling
321  */
322
323 static ssize_t usb_pcwd_write(struct file *file, const char __user *data,
324                               size_t len, loff_t *ppos)
325 {
326         /* See if we got the magic character 'V' and reload the timer */
327         if (len) {
328                 if (!nowayout) {
329                         size_t i;
330
331                         /* note: just in case someone wrote the magic character
332                          * five months ago... */
333                         expect_release = 0;
334
335                         /* scan to see whether or not we got the magic character */
336                         for (i = 0; i != len; i++) {
337                                 char c;
338                                 if(get_user(c, data+i))
339                                         return -EFAULT;
340                                 if (c == 'V')
341                                         expect_release = 42;
342                         }
343                 }
344
345                 /* someone wrote to us, we should reload the timer */
346                 usb_pcwd_keepalive(usb_pcwd_device);
347         }
348         return len;
349 }
350
351 static int usb_pcwd_ioctl(struct inode *inode, struct file *file,
352                           unsigned int cmd, unsigned long arg)
353 {
354         void __user *argp = (void __user *)arg;
355         int __user *p = argp;
356         static struct watchdog_info ident = {
357                 .options =              WDIOF_KEEPALIVEPING |
358                                         WDIOF_SETTIMEOUT |
359                                         WDIOF_MAGICCLOSE,
360                 .firmware_version =     1,
361                 .identity =             DRIVER_NAME,
362         };
363
364         switch (cmd) {
365                 case WDIOC_GETSUPPORT:
366                         return copy_to_user(argp, &ident,
367                                 sizeof (ident)) ? -EFAULT : 0;
368
369                 case WDIOC_GETSTATUS:
370                 case WDIOC_GETBOOTSTATUS:
371                         return put_user(0, p);
372
373                 case WDIOC_GETTEMP:
374                 {
375                         int temperature;
376
377                         if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
378                                 return -EFAULT;
379
380                         return put_user(temperature, p);
381                 }
382
383                 case WDIOC_KEEPALIVE:
384                         usb_pcwd_keepalive(usb_pcwd_device);
385                         return 0;
386
387                 case WDIOC_SETOPTIONS:
388                 {
389                         int new_options, retval = -EINVAL;
390
391                         if (get_user (new_options, p))
392                                 return -EFAULT;
393
394                         if (new_options & WDIOS_DISABLECARD) {
395                                 usb_pcwd_stop(usb_pcwd_device);
396                                 retval = 0;
397                         }
398
399                         if (new_options & WDIOS_ENABLECARD) {
400                                 usb_pcwd_start(usb_pcwd_device);
401                                 retval = 0;
402                         }
403
404                         return retval;
405                 }
406
407                 case WDIOC_SETTIMEOUT:
408                 {
409                         int new_heartbeat;
410
411                         if (get_user(new_heartbeat, p))
412                                 return -EFAULT;
413
414                         if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat))
415                             return -EINVAL;
416
417                         usb_pcwd_keepalive(usb_pcwd_device);
418                         /* Fall */
419                 }
420
421                 case WDIOC_GETTIMEOUT:
422                         return put_user(heartbeat, p);
423
424                 default:
425                         return -ENOIOCTLCMD;
426         }
427 }
428
429 static int usb_pcwd_open(struct inode *inode, struct file *file)
430 {
431         /* /dev/watchdog can only be opened once */
432         if (test_and_set_bit(0, &is_active))
433                 return -EBUSY;
434
435         /* Activate */
436         usb_pcwd_start(usb_pcwd_device);
437         usb_pcwd_keepalive(usb_pcwd_device);
438         return nonseekable_open(inode, file);
439 }
440
441 static int usb_pcwd_release(struct inode *inode, struct file *file)
442 {
443         /*
444          *      Shut off the timer.
445          */
446         if (expect_release == 42) {
447                 usb_pcwd_stop(usb_pcwd_device);
448         } else {
449                 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
450                 usb_pcwd_keepalive(usb_pcwd_device);
451         }
452         expect_release = 0;
453         clear_bit(0, &is_active);
454         return 0;
455 }
456
457 /*
458  *      /dev/temperature handling
459  */
460
461 static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data,
462                                 size_t len, loff_t *ppos)
463 {
464         int temperature;
465
466         if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
467                 return -EFAULT;
468
469         if (copy_to_user(data, &temperature, 1))
470                 return -EFAULT;
471
472         return 1;
473 }
474
475 static int usb_pcwd_temperature_open(struct inode *inode, struct file *file)
476 {
477         return nonseekable_open(inode, file);
478 }
479
480 static int usb_pcwd_temperature_release(struct inode *inode, struct file *file)
481 {
482         return 0;
483 }
484
485 /*
486  *      Notify system
487  */
488
489 static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
490 {
491         if (code==SYS_DOWN || code==SYS_HALT) {
492                 /* Turn the WDT off */
493                 usb_pcwd_stop(usb_pcwd_device);
494         }
495
496         return NOTIFY_DONE;
497 }
498
499 /*
500  *      Kernel Interfaces
501  */
502
503 static struct file_operations usb_pcwd_fops = {
504         .owner =        THIS_MODULE,
505         .llseek =       no_llseek,
506         .write =        usb_pcwd_write,
507         .ioctl =        usb_pcwd_ioctl,
508         .open =         usb_pcwd_open,
509         .release =      usb_pcwd_release,
510 };
511
512 static struct miscdevice usb_pcwd_miscdev = {
513         .minor =        WATCHDOG_MINOR,
514         .name =         "watchdog",
515         .fops =         &usb_pcwd_fops,
516 };
517
518 static struct file_operations usb_pcwd_temperature_fops = {
519         .owner =        THIS_MODULE,
520         .llseek =       no_llseek,
521         .read =         usb_pcwd_temperature_read,
522         .open =         usb_pcwd_temperature_open,
523         .release =      usb_pcwd_temperature_release,
524 };
525
526 static struct miscdevice usb_pcwd_temperature_miscdev = {
527         .minor =        TEMP_MINOR,
528         .name =         "temperature",
529         .fops =         &usb_pcwd_temperature_fops,
530 };
531
532 static struct notifier_block usb_pcwd_notifier = {
533         .notifier_call =        usb_pcwd_notify_sys,
534 };
535
536 /**
537  *      usb_pcwd_delete
538  */
539 static inline void usb_pcwd_delete (struct usb_pcwd_private *usb_pcwd)
540 {
541         if (usb_pcwd->intr_urb != NULL)
542                 usb_free_urb (usb_pcwd->intr_urb);
543         if (usb_pcwd->intr_buffer != NULL)
544                 usb_buffer_free(usb_pcwd->udev, usb_pcwd->intr_size,
545                                 usb_pcwd->intr_buffer, usb_pcwd->intr_dma);
546         kfree (usb_pcwd);
547 }
548
549 /**
550  *      usb_pcwd_probe
551  *
552  *      Called by the usb core when a new device is connected that it thinks
553  *      this driver might be interested in.
554  */
555 static int usb_pcwd_probe(struct usb_interface *interface, const struct usb_device_id *id)
556 {
557         struct usb_device *udev = interface_to_usbdev(interface);
558         struct usb_host_interface *iface_desc;
559         struct usb_endpoint_descriptor *endpoint;
560         struct usb_pcwd_private *usb_pcwd = NULL;
561         int pipe, maxp;
562         int retval = -ENOMEM;
563         int got_fw_rev;
564         unsigned char fw_rev_major, fw_rev_minor;
565         char fw_ver_str[20];
566         unsigned char option_switches, dummy;
567
568         cards_found++;
569         if (cards_found > 1) {
570                 printk(KERN_ERR PFX "This driver only supports 1 device\n");
571                 return -ENODEV;
572         }
573
574         /* get the active interface descriptor */
575         iface_desc = interface->cur_altsetting;
576
577         /* check out that we have a HID device */
578         if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) {
579                 printk(KERN_ERR PFX "The device isn't a Human Interface Device\n");
580                 return -ENODEV;
581         }
582
583         /* check out the endpoint: it has to be Interrupt & IN */
584         endpoint = &iface_desc->endpoint[0].desc;
585
586         if (!((endpoint->bEndpointAddress & USB_DIR_IN) &&
587              ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
588                                 == USB_ENDPOINT_XFER_INT))) {
589                 /* we didn't find a Interrupt endpoint with direction IN */
590                 printk(KERN_ERR PFX "Couldn't find an INTR & IN endpoint\n");
591                 return -ENODEV;
592         }
593
594         /* get a handle to the interrupt data pipe */
595         pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
596         maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
597
598         /* allocate memory for our device and initialize it */
599         usb_pcwd = kmalloc (sizeof(struct usb_pcwd_private), GFP_KERNEL);
600         if (usb_pcwd == NULL) {
601                 printk(KERN_ERR PFX "Out of memory\n");
602                 goto error;
603         }
604         memset (usb_pcwd, 0x00, sizeof (*usb_pcwd));
605
606         usb_pcwd_device = usb_pcwd;
607
608         init_MUTEX (&usb_pcwd->sem);
609         usb_pcwd->udev = udev;
610         usb_pcwd->interface = interface;
611         usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber;
612         usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ? le16_to_cpu(endpoint->wMaxPacketSize) : 8);
613
614         /* set up the memory buffer's */
615         if (!(usb_pcwd->intr_buffer = usb_buffer_alloc(udev, usb_pcwd->intr_size, SLAB_ATOMIC, &usb_pcwd->intr_dma))) {
616                 printk(KERN_ERR PFX "Out of memory\n");
617                 goto error;
618         }
619
620         /* allocate the urb's */
621         usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
622         if (!usb_pcwd->intr_urb) {
623                 printk(KERN_ERR PFX "Out of memory\n");
624                 goto error;
625         }
626
627         /* initialise the intr urb's */
628         usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe,
629                         usb_pcwd->intr_buffer, usb_pcwd->intr_size,
630                         usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval);
631         usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma;
632         usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
633
634         /* register our interrupt URB with the USB system */
635         if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) {
636                 printk(KERN_ERR PFX "Problem registering interrupt URB\n");
637                 retval = -EIO; /* failure */
638                 goto error;
639         }
640
641         /* The device exists and can be communicated with */
642         usb_pcwd->exists = 1;
643
644         /* disable card */
645         usb_pcwd_stop(usb_pcwd);
646
647         /* Get the Firmware Version */
648         got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor);
649         if (got_fw_rev) {
650                 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
651         } else {
652                 sprintf(fw_ver_str, "<card no answer>");
653         }
654
655         printk(KERN_INFO PFX "Found card (Firmware: %s) with temp option\n",
656                 fw_ver_str);
657
658         /* Get switch settings */
659         usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy, &option_switches);
660
661         printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
662                 option_switches,
663                 ((option_switches & 0x10) ? "ON" : "OFF"),
664                 ((option_switches & 0x08) ? "ON" : "OFF"));
665
666         /* Check that the heartbeat value is within it's range ; if not reset to the default */
667         if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) {
668                 usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT);
669                 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
670                         WATCHDOG_HEARTBEAT);
671         }
672
673         retval = register_reboot_notifier(&usb_pcwd_notifier);
674         if (retval != 0) {
675                 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
676                         retval);
677                 goto error;
678         }
679
680         retval = misc_register(&usb_pcwd_temperature_miscdev);
681         if (retval != 0) {
682                 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
683                         TEMP_MINOR, retval);
684                 goto err_out_unregister_reboot;
685         }
686
687         retval = misc_register(&usb_pcwd_miscdev);
688         if (retval != 0) {
689                 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
690                         WATCHDOG_MINOR, retval);
691                 goto err_out_misc_deregister;
692         }
693
694         /* we can register the device now, as it is ready */
695         usb_set_intfdata (interface, usb_pcwd);
696
697         printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
698                 heartbeat, nowayout);
699
700         return 0;
701
702 err_out_misc_deregister:
703         misc_deregister(&usb_pcwd_temperature_miscdev);
704 err_out_unregister_reboot:
705         unregister_reboot_notifier(&usb_pcwd_notifier);
706 error:
707         usb_pcwd_delete (usb_pcwd);
708         usb_pcwd_device = NULL;
709         return retval;
710 }
711
712
713 /**
714  *      usb_pcwd_disconnect
715  *
716  *      Called by the usb core when the device is removed from the system.
717  *
718  *      This routine guarantees that the driver will not submit any more urbs
719  *      by clearing dev->udev.
720  */
721 static void usb_pcwd_disconnect(struct usb_interface *interface)
722 {
723         struct usb_pcwd_private *usb_pcwd;
724
725         /* prevent races with open() */
726         down (&disconnect_sem);
727
728         usb_pcwd = usb_get_intfdata (interface);
729         usb_set_intfdata (interface, NULL);
730
731         down (&usb_pcwd->sem);
732
733         /* Stop the timer before we leave */
734         if (!nowayout)
735                 usb_pcwd_stop(usb_pcwd);
736
737         /* We should now stop communicating with the USB PCWD device */
738         usb_pcwd->exists = 0;
739
740         /* Deregister */
741         misc_deregister(&usb_pcwd_miscdev);
742         misc_deregister(&usb_pcwd_temperature_miscdev);
743         unregister_reboot_notifier(&usb_pcwd_notifier);
744
745         up (&usb_pcwd->sem);
746
747         /* Delete the USB PCWD device */
748         usb_pcwd_delete(usb_pcwd);
749
750         cards_found--;
751
752         up (&disconnect_sem);
753
754         printk(KERN_INFO PFX "USB PC Watchdog disconnected\n");
755 }
756
757
758
759 /**
760  *      usb_pcwd_init
761  */
762 static int __init usb_pcwd_init(void)
763 {
764         int result;
765
766         /* register this driver with the USB subsystem */
767         result = usb_register(&usb_pcwd_driver);
768         if (result) {
769                 printk(KERN_ERR PFX "usb_register failed. Error number %d\n",
770                     result);
771                 return result;
772         }
773
774         printk(KERN_INFO PFX DRIVER_DESC " v" DRIVER_VERSION " (" DRIVER_DATE ")\n");
775         return 0;
776 }
777
778
779 /**
780  *      usb_pcwd_exit
781  */
782 static void __exit usb_pcwd_exit(void)
783 {
784         /* deregister this driver with the USB subsystem */
785         usb_deregister(&usb_pcwd_driver);
786 }
787
788
789 module_init (usb_pcwd_init);
790 module_exit (usb_pcwd_exit);