115a0ebebf4acdbded5cd73012c9b32701ff3789
[sfrench/cifs-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@lxorguk.ukuu.org.uk>,
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
28
29 #include <linux/module.h>       /* For module specific items */
30 #include <linux/moduleparam.h>  /* For new moduleparam's */
31 #include <linux/types.h>        /* For standard types (like size_t) */
32 #include <linux/errno.h>        /* For the -ENODEV/... values */
33 #include <linux/kernel.h>       /* For printk/panic/... */
34 #include <linux/delay.h>        /* For mdelay function */
35 #include <linux/miscdevice.h>   /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */
36 #include <linux/watchdog.h>     /* For the watchdog specific items */
37 #include <linux/notifier.h>     /* For notifier support */
38 #include <linux/reboot.h>       /* For reboot_notifier stuff */
39 #include <linux/init.h>         /* For __init/__exit/... */
40 #include <linux/fs.h>           /* For file operations */
41 #include <linux/usb.h>          /* For USB functions */
42 #include <linux/slab.h>         /* For kmalloc, ... */
43 #include <linux/mutex.h>        /* For mutex locking */
44 #include <linux/hid.h>          /* For HID_REQ_SET_REPORT & HID_DT_REPORT */
45 #include <linux/uaccess.h>      /* For copy_to_user/put_user/... */
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
55 #undef dbg
56 #ifndef DEBUG
57 #define DEBUG
58 #endif
59 #define dbg(format, ...)                                \
60 do {                                                    \
61         if (debug)                                      \
62                 pr_debug(format "\n", ##__VA_ARGS__);   \
63 } while (0)
64
65 /* Module and Version Information */
66 #define DRIVER_VERSION "1.02"
67 #define DRIVER_AUTHOR "Wim Van Sebroeck <wim@iguana.be>"
68 #define DRIVER_DESC "Berkshire USB-PC Watchdog driver"
69 #define DRIVER_LICENSE "GPL"
70 #define DRIVER_NAME "pcwd_usb"
71
72 MODULE_AUTHOR(DRIVER_AUTHOR);
73 MODULE_DESCRIPTION(DRIVER_DESC);
74 MODULE_LICENSE(DRIVER_LICENSE);
75 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
76 MODULE_ALIAS_MISCDEV(TEMP_MINOR);
77
78 /* Module Parameters */
79 module_param(debug, int, 0);
80 MODULE_PARM_DESC(debug, "Debug enabled or not");
81
82 #define WATCHDOG_HEARTBEAT 0    /* default heartbeat =
83                                                 delay-time from dip-switches */
84 static int heartbeat = WATCHDOG_HEARTBEAT;
85 module_param(heartbeat, int, 0);
86 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
87         "(0<heartbeat<65536 or 0=delay-time from dip-switches, default="
88                                 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
89
90 static bool nowayout = WATCHDOG_NOWAYOUT;
91 module_param(nowayout, bool, 0);
92 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
93                                 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
94
95 /* The vendor and product id's for the USB-PC Watchdog card */
96 #define USB_PCWD_VENDOR_ID      0x0c98
97 #define USB_PCWD_PRODUCT_ID     0x1140
98
99 /* table of devices that work with this driver */
100 static struct usb_device_id usb_pcwd_table[] = {
101         { USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) },
102         { }                                     /* Terminating entry */
103 };
104 MODULE_DEVICE_TABLE(usb, usb_pcwd_table);
105
106 /* according to documentation max. time to process a command for the USB
107  * watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */
108 #define USB_COMMAND_TIMEOUT     250
109
110 /* Watchdog's internal commands */
111 #define CMD_READ_TEMP                   0x02    /* Read Temperature;
112                                                         Re-trigger Watchdog */
113 #define CMD_TRIGGER                     CMD_READ_TEMP
114 #define CMD_GET_STATUS                  0x04    /* Get Status Information */
115 #define CMD_GET_FIRMWARE_VERSION        0x08    /* Get Firmware Version */
116 #define CMD_GET_DIP_SWITCH_SETTINGS     0x0c    /* Get Dip Switch Settings */
117 #define CMD_READ_WATCHDOG_TIMEOUT       0x18    /* Read Current Watchdog Time */
118 #define CMD_WRITE_WATCHDOG_TIMEOUT      0x19    /* Write Current WatchdogTime */
119 #define CMD_ENABLE_WATCHDOG             0x30    /* Enable / Disable Watchdog */
120 #define CMD_DISABLE_WATCHDOG            CMD_ENABLE_WATCHDOG
121
122 /* Watchdog's Dip Switch heartbeat values */
123 static const int heartbeat_tbl[] = {
124         5,      /* OFF-OFF-OFF  =  5 Sec  */
125         10,     /* OFF-OFF-ON   = 10 Sec  */
126         30,     /* OFF-ON-OFF   = 30 Sec  */
127         60,     /* OFF-ON-ON    =  1 Min  */
128         300,    /* ON-OFF-OFF   =  5 Min  */
129         600,    /* ON-OFF-ON    = 10 Min  */
130         1800,   /* ON-ON-OFF    = 30 Min  */
131         3600,   /* ON-ON-ON     =  1 hour */
132 };
133
134 /* We can only use 1 card due to the /dev/watchdog restriction */
135 static int cards_found;
136
137 /* some internal variables */
138 static unsigned long is_active;
139 static char expect_release;
140
141 /* Structure to hold all of our device specific stuff */
142 struct usb_pcwd_private {
143         /* save off the usb device pointer */
144         struct usb_device       *udev;
145         /* the interface for this device */
146         struct usb_interface    *interface;
147
148         /* the interface number used for cmd's */
149         unsigned int            interface_number;
150
151         /* the buffer to intr data */
152         unsigned char           *intr_buffer;
153         /* the dma address for the intr buffer */
154         dma_addr_t              intr_dma;
155         /* the size of the intr buffer */
156         size_t                  intr_size;
157         /* the urb used for the intr pipe */
158         struct urb              *intr_urb;
159
160         /* The command that is reported back */
161         unsigned char           cmd_command;
162         /* The data MSB that is reported back */
163         unsigned char           cmd_data_msb;
164         /* The data LSB that is reported back */
165         unsigned char           cmd_data_lsb;
166         /* true if we received a report after a command */
167         atomic_t                cmd_received;
168
169         /* Wether or not the device exists */
170         int                     exists;
171         /* locks this structure */
172         struct mutex            mtx;
173 };
174 static struct usb_pcwd_private *usb_pcwd_device;
175
176 /* prevent races between open() and disconnect() */
177 static DEFINE_MUTEX(disconnect_mutex);
178
179 /* local function prototypes */
180 static int usb_pcwd_probe(struct usb_interface *interface,
181                                                 const struct usb_device_id *id);
182 static void usb_pcwd_disconnect(struct usb_interface *interface);
183
184 /* usb specific object needed to register this driver with the usb subsystem */
185 static struct usb_driver usb_pcwd_driver = {
186         .name =         DRIVER_NAME,
187         .probe =        usb_pcwd_probe,
188         .disconnect =   usb_pcwd_disconnect,
189         .id_table =     usb_pcwd_table,
190 };
191
192
193 static void usb_pcwd_intr_done(struct urb *urb)
194 {
195         struct usb_pcwd_private *usb_pcwd =
196                                 (struct usb_pcwd_private *)urb->context;
197         unsigned char *data = usb_pcwd->intr_buffer;
198         int retval;
199
200         switch (urb->status) {
201         case 0:                 /* success */
202                 break;
203         case -ECONNRESET:       /* unlink */
204         case -ENOENT:
205         case -ESHUTDOWN:
206                 /* this urb is terminated, clean up */
207                 dbg("%s - urb shutting down with status: %d", __func__,
208                                                                 urb->status);
209                 return;
210         /* -EPIPE:  should clear the halt */
211         default:                /* error */
212                 dbg("%s - nonzero urb status received: %d", __func__,
213                                                                 urb->status);
214                 goto resubmit;
215         }
216
217         dbg("received following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
218                 data[0], data[1], data[2]);
219
220         usb_pcwd->cmd_command  = data[0];
221         usb_pcwd->cmd_data_msb = data[1];
222         usb_pcwd->cmd_data_lsb = data[2];
223
224         /* notify anyone waiting that the cmd has finished */
225         atomic_set(&usb_pcwd->cmd_received, 1);
226
227 resubmit:
228         retval = usb_submit_urb(urb, GFP_ATOMIC);
229         if (retval)
230                 pr_err("can't resubmit intr, usb_submit_urb failed with result %d\n",
231                        retval);
232 }
233
234 static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd,
235                 unsigned char cmd, unsigned char *msb, unsigned char *lsb)
236 {
237         int got_response, count;
238         unsigned char *buf;
239
240         /* We will not send any commands if the USB PCWD device does
241          * not exist */
242         if ((!usb_pcwd) || (!usb_pcwd->exists))
243                 return -1;
244
245         buf = kmalloc(6, GFP_KERNEL);
246         if (buf == NULL)
247                 return 0;
248
249         /* The USB PC Watchdog uses a 6 byte report format.
250          * The board currently uses only 3 of the six bytes of the report. */
251         buf[0] = cmd;                   /* Byte 0 = CMD */
252         buf[1] = *msb;                  /* Byte 1 = Data MSB */
253         buf[2] = *lsb;                  /* Byte 2 = Data LSB */
254         buf[3] = buf[4] = buf[5] = 0;   /* All other bytes not used */
255
256         dbg("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
257                 buf[0], buf[1], buf[2]);
258
259         atomic_set(&usb_pcwd->cmd_received, 0);
260
261         if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0),
262                         HID_REQ_SET_REPORT, HID_DT_REPORT,
263                         0x0200, usb_pcwd->interface_number, buf, sizeof(buf),
264                         USB_COMMAND_TIMEOUT) != sizeof(buf)) {
265                 dbg("usb_pcwd_send_command: error in usb_control_msg for "
266                                 "cmd 0x%x 0x%x 0x%x\n", cmd, *msb, *lsb);
267         }
268         /* wait till the usb card processed the command,
269          * with a max. timeout of USB_COMMAND_TIMEOUT */
270         got_response = 0;
271         for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response);
272                                                                 count++) {
273                 mdelay(1);
274                 if (atomic_read(&usb_pcwd->cmd_received))
275                         got_response = 1;
276         }
277
278         if ((got_response) && (cmd == usb_pcwd->cmd_command)) {
279                 /* read back response */
280                 *msb = usb_pcwd->cmd_data_msb;
281                 *lsb = usb_pcwd->cmd_data_lsb;
282         }
283
284         kfree(buf);
285
286         return got_response;
287 }
288
289 static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd)
290 {
291         unsigned char msb = 0x00;
292         unsigned char lsb = 0x00;
293         int retval;
294
295         /* Enable Watchdog */
296         retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG,
297                                                                 &msb, &lsb);
298
299         if ((retval == 0) || (lsb == 0)) {
300                 pr_err("Card did not acknowledge enable attempt\n");
301                 return -1;
302         }
303
304         return 0;
305 }
306
307 static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd)
308 {
309         unsigned char msb = 0xA5;
310         unsigned char lsb = 0xC3;
311         int retval;
312
313         /* Disable Watchdog */
314         retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG,
315                                                                 &msb, &lsb);
316
317         if ((retval == 0) || (lsb != 0)) {
318                 pr_err("Card did not acknowledge disable attempt\n");
319                 return -1;
320         }
321
322         return 0;
323 }
324
325 static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd)
326 {
327         unsigned char dummy;
328
329         /* Re-trigger Watchdog */
330         usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy);
331
332         return 0;
333 }
334
335 static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t)
336 {
337         unsigned char msb = t / 256;
338         unsigned char lsb = t % 256;
339
340         if ((t < 0x0001) || (t > 0xFFFF))
341                 return -EINVAL;
342
343         /* Write new heartbeat to watchdog */
344         usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb);
345
346         heartbeat = t;
347         return 0;
348 }
349
350 static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd,
351                                                         int *temperature)
352 {
353         unsigned char msb, lsb;
354
355         usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb);
356
357         /*
358          * Convert celsius to fahrenheit, since this was
359          * the decided 'standard' for this return value.
360          */
361         *temperature = (lsb * 9 / 5) + 32;
362
363         return 0;
364 }
365
366 static int usb_pcwd_get_timeleft(struct usb_pcwd_private *usb_pcwd,
367                                                                 int *time_left)
368 {
369         unsigned char msb, lsb;
370
371         /* Read the time that's left before rebooting */
372         /* Note: if the board is not yet armed then we will read 0xFFFF */
373         usb_pcwd_send_command(usb_pcwd, CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
374
375         *time_left = (msb << 8) + lsb;
376
377         return 0;
378 }
379
380 /*
381  *      /dev/watchdog handling
382  */
383
384 static ssize_t usb_pcwd_write(struct file *file, const char __user *data,
385                                                 size_t len, loff_t *ppos)
386 {
387         /* See if we got the magic character 'V' and reload the timer */
388         if (len) {
389                 if (!nowayout) {
390                         size_t i;
391
392                         /* note: just in case someone wrote the magic character
393                          * five months ago... */
394                         expect_release = 0;
395
396                         /* scan to see whether or not we got the
397                          * magic character */
398                         for (i = 0; i != len; i++) {
399                                 char c;
400                                 if (get_user(c, data + i))
401                                         return -EFAULT;
402                                 if (c == 'V')
403                                         expect_release = 42;
404                         }
405                 }
406
407                 /* someone wrote to us, we should reload the timer */
408                 usb_pcwd_keepalive(usb_pcwd_device);
409         }
410         return len;
411 }
412
413 static long usb_pcwd_ioctl(struct file *file, unsigned int cmd,
414                                                 unsigned long arg)
415 {
416         void __user *argp = (void __user *)arg;
417         int __user *p = argp;
418         static const struct watchdog_info ident = {
419                 .options =              WDIOF_KEEPALIVEPING |
420                                         WDIOF_SETTIMEOUT |
421                                         WDIOF_MAGICCLOSE,
422                 .firmware_version =     1,
423                 .identity =             DRIVER_NAME,
424         };
425
426         switch (cmd) {
427         case WDIOC_GETSUPPORT:
428                 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
429
430         case WDIOC_GETSTATUS:
431         case WDIOC_GETBOOTSTATUS:
432                 return put_user(0, p);
433
434         case WDIOC_GETTEMP:
435         {
436                 int temperature;
437
438                 if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
439                         return -EFAULT;
440
441                 return put_user(temperature, p);
442         }
443
444         case WDIOC_SETOPTIONS:
445         {
446                 int new_options, retval = -EINVAL;
447
448                 if (get_user(new_options, p))
449                         return -EFAULT;
450
451                 if (new_options & WDIOS_DISABLECARD) {
452                         usb_pcwd_stop(usb_pcwd_device);
453                         retval = 0;
454                 }
455
456                 if (new_options & WDIOS_ENABLECARD) {
457                         usb_pcwd_start(usb_pcwd_device);
458                         retval = 0;
459                 }
460
461                 return retval;
462         }
463
464         case WDIOC_KEEPALIVE:
465                 usb_pcwd_keepalive(usb_pcwd_device);
466                 return 0;
467
468         case WDIOC_SETTIMEOUT:
469         {
470                 int new_heartbeat;
471
472                 if (get_user(new_heartbeat, p))
473                         return -EFAULT;
474
475                 if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat))
476                         return -EINVAL;
477
478                 usb_pcwd_keepalive(usb_pcwd_device);
479                 /* Fall */
480         }
481
482         case WDIOC_GETTIMEOUT:
483                 return put_user(heartbeat, p);
484
485         case WDIOC_GETTIMELEFT:
486         {
487                 int time_left;
488
489                 if (usb_pcwd_get_timeleft(usb_pcwd_device, &time_left))
490                         return -EFAULT;
491
492                 return put_user(time_left, p);
493         }
494
495         default:
496                 return -ENOTTY;
497         }
498 }
499
500 static int usb_pcwd_open(struct inode *inode, struct file *file)
501 {
502         /* /dev/watchdog can only be opened once */
503         if (test_and_set_bit(0, &is_active))
504                 return -EBUSY;
505
506         /* Activate */
507         usb_pcwd_start(usb_pcwd_device);
508         usb_pcwd_keepalive(usb_pcwd_device);
509         return nonseekable_open(inode, file);
510 }
511
512 static int usb_pcwd_release(struct inode *inode, struct file *file)
513 {
514         /*
515          *      Shut off the timer.
516          */
517         if (expect_release == 42) {
518                 usb_pcwd_stop(usb_pcwd_device);
519         } else {
520                 pr_crit("Unexpected close, not stopping watchdog!\n");
521                 usb_pcwd_keepalive(usb_pcwd_device);
522         }
523         expect_release = 0;
524         clear_bit(0, &is_active);
525         return 0;
526 }
527
528 /*
529  *      /dev/temperature handling
530  */
531
532 static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data,
533                                 size_t len, loff_t *ppos)
534 {
535         int temperature;
536
537         if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
538                 return -EFAULT;
539
540         if (copy_to_user(data, &temperature, 1))
541                 return -EFAULT;
542
543         return 1;
544 }
545
546 static int usb_pcwd_temperature_open(struct inode *inode, struct file *file)
547 {
548         return nonseekable_open(inode, file);
549 }
550
551 static int usb_pcwd_temperature_release(struct inode *inode, struct file *file)
552 {
553         return 0;
554 }
555
556 /*
557  *      Notify system
558  */
559
560 static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code,
561                                                                 void *unused)
562 {
563         if (code == SYS_DOWN || code == SYS_HALT)
564                 usb_pcwd_stop(usb_pcwd_device); /* Turn the WDT off */
565
566         return NOTIFY_DONE;
567 }
568
569 /*
570  *      Kernel Interfaces
571  */
572
573 static const struct file_operations usb_pcwd_fops = {
574         .owner =        THIS_MODULE,
575         .llseek =       no_llseek,
576         .write =        usb_pcwd_write,
577         .unlocked_ioctl = usb_pcwd_ioctl,
578         .open =         usb_pcwd_open,
579         .release =      usb_pcwd_release,
580 };
581
582 static struct miscdevice usb_pcwd_miscdev = {
583         .minor =        WATCHDOG_MINOR,
584         .name =         "watchdog",
585         .fops =         &usb_pcwd_fops,
586 };
587
588 static const struct file_operations usb_pcwd_temperature_fops = {
589         .owner =        THIS_MODULE,
590         .llseek =       no_llseek,
591         .read =         usb_pcwd_temperature_read,
592         .open =         usb_pcwd_temperature_open,
593         .release =      usb_pcwd_temperature_release,
594 };
595
596 static struct miscdevice usb_pcwd_temperature_miscdev = {
597         .minor =        TEMP_MINOR,
598         .name =         "temperature",
599         .fops =         &usb_pcwd_temperature_fops,
600 };
601
602 static struct notifier_block usb_pcwd_notifier = {
603         .notifier_call =        usb_pcwd_notify_sys,
604 };
605
606 /**
607  *      usb_pcwd_delete
608  */
609 static inline void usb_pcwd_delete(struct usb_pcwd_private *usb_pcwd)
610 {
611         usb_free_urb(usb_pcwd->intr_urb);
612         if (usb_pcwd->intr_buffer != NULL)
613                 usb_free_coherent(usb_pcwd->udev, usb_pcwd->intr_size,
614                                   usb_pcwd->intr_buffer, usb_pcwd->intr_dma);
615         kfree(usb_pcwd);
616 }
617
618 /**
619  *      usb_pcwd_probe
620  *
621  *      Called by the usb core when a new device is connected that it thinks
622  *      this driver might be interested in.
623  */
624 static int usb_pcwd_probe(struct usb_interface *interface,
625                                                 const struct usb_device_id *id)
626 {
627         struct usb_device *udev = interface_to_usbdev(interface);
628         struct usb_host_interface *iface_desc;
629         struct usb_endpoint_descriptor *endpoint;
630         struct usb_pcwd_private *usb_pcwd = NULL;
631         int pipe, maxp;
632         int retval = -ENOMEM;
633         int got_fw_rev;
634         unsigned char fw_rev_major, fw_rev_minor;
635         char fw_ver_str[20];
636         unsigned char option_switches, dummy;
637
638         cards_found++;
639         if (cards_found > 1) {
640                 pr_err("This driver only supports 1 device\n");
641                 return -ENODEV;
642         }
643
644         /* get the active interface descriptor */
645         iface_desc = interface->cur_altsetting;
646
647         /* check out that we have a HID device */
648         if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) {
649                 pr_err("The device isn't a Human Interface Device\n");
650                 return -ENODEV;
651         }
652
653         /* check out the endpoint: it has to be Interrupt & IN */
654         endpoint = &iface_desc->endpoint[0].desc;
655
656         if (!usb_endpoint_is_int_in(endpoint)) {
657                 /* we didn't find a Interrupt endpoint with direction IN */
658                 pr_err("Couldn't find an INTR & IN endpoint\n");
659                 return -ENODEV;
660         }
661
662         /* get a handle to the interrupt data pipe */
663         pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
664         maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
665
666         /* allocate memory for our device and initialize it */
667         usb_pcwd = kzalloc(sizeof(struct usb_pcwd_private), GFP_KERNEL);
668         if (usb_pcwd == NULL) {
669                 pr_err("Out of memory\n");
670                 goto error;
671         }
672
673         usb_pcwd_device = usb_pcwd;
674
675         mutex_init(&usb_pcwd->mtx);
676         usb_pcwd->udev = udev;
677         usb_pcwd->interface = interface;
678         usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber;
679         usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ?
680                                 le16_to_cpu(endpoint->wMaxPacketSize) : 8);
681
682         /* set up the memory buffer's */
683         usb_pcwd->intr_buffer = usb_alloc_coherent(udev, usb_pcwd->intr_size,
684                                         GFP_ATOMIC, &usb_pcwd->intr_dma);
685         if (!usb_pcwd->intr_buffer) {
686                 pr_err("Out of memory\n");
687                 goto error;
688         }
689
690         /* allocate the urb's */
691         usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
692         if (!usb_pcwd->intr_urb) {
693                 pr_err("Out of memory\n");
694                 goto error;
695         }
696
697         /* initialise the intr urb's */
698         usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe,
699                         usb_pcwd->intr_buffer, usb_pcwd->intr_size,
700                         usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval);
701         usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma;
702         usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
703
704         /* register our interrupt URB with the USB system */
705         if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) {
706                 pr_err("Problem registering interrupt URB\n");
707                 retval = -EIO; /* failure */
708                 goto error;
709         }
710
711         /* The device exists and can be communicated with */
712         usb_pcwd->exists = 1;
713
714         /* disable card */
715         usb_pcwd_stop(usb_pcwd);
716
717         /* Get the Firmware Version */
718         got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION,
719                                                 &fw_rev_major, &fw_rev_minor);
720         if (got_fw_rev)
721                 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
722         else
723                 sprintf(fw_ver_str, "<card no answer>");
724
725         pr_info("Found card (Firmware: %s) with temp option\n", fw_ver_str);
726
727         /* Get switch settings */
728         usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy,
729                                                         &option_switches);
730
731         pr_info("Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
732                 option_switches,
733                 ((option_switches & 0x10) ? "ON" : "OFF"),
734                 ((option_switches & 0x08) ? "ON" : "OFF"));
735
736         /* If heartbeat = 0 then we use the heartbeat from the dip-switches */
737         if (heartbeat == 0)
738                 heartbeat = heartbeat_tbl[(option_switches & 0x07)];
739
740         /* Check that the heartbeat value is within it's range ;
741          * if not reset to the default */
742         if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) {
743                 usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT);
744                 pr_info("heartbeat value must be 0<heartbeat<65536, using %d\n",
745                         WATCHDOG_HEARTBEAT);
746         }
747
748         retval = register_reboot_notifier(&usb_pcwd_notifier);
749         if (retval != 0) {
750                 pr_err("cannot register reboot notifier (err=%d)\n", retval);
751                 goto error;
752         }
753
754         retval = misc_register(&usb_pcwd_temperature_miscdev);
755         if (retval != 0) {
756                 pr_err("cannot register miscdev on minor=%d (err=%d)\n",
757                        TEMP_MINOR, retval);
758                 goto err_out_unregister_reboot;
759         }
760
761         retval = misc_register(&usb_pcwd_miscdev);
762         if (retval != 0) {
763                 pr_err("cannot register miscdev on minor=%d (err=%d)\n",
764                        WATCHDOG_MINOR, retval);
765                 goto err_out_misc_deregister;
766         }
767
768         /* we can register the device now, as it is ready */
769         usb_set_intfdata(interface, usb_pcwd);
770
771         pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
772                 heartbeat, nowayout);
773
774         return 0;
775
776 err_out_misc_deregister:
777         misc_deregister(&usb_pcwd_temperature_miscdev);
778 err_out_unregister_reboot:
779         unregister_reboot_notifier(&usb_pcwd_notifier);
780 error:
781         if (usb_pcwd)
782                 usb_pcwd_delete(usb_pcwd);
783         usb_pcwd_device = NULL;
784         return retval;
785 }
786
787
788 /**
789  *      usb_pcwd_disconnect
790  *
791  *      Called by the usb core when the device is removed from the system.
792  *
793  *      This routine guarantees that the driver will not submit any more urbs
794  *      by clearing dev->udev.
795  */
796 static void usb_pcwd_disconnect(struct usb_interface *interface)
797 {
798         struct usb_pcwd_private *usb_pcwd;
799
800         /* prevent races with open() */
801         mutex_lock(&disconnect_mutex);
802
803         usb_pcwd = usb_get_intfdata(interface);
804         usb_set_intfdata(interface, NULL);
805
806         mutex_lock(&usb_pcwd->mtx);
807
808         /* Stop the timer before we leave */
809         if (!nowayout)
810                 usb_pcwd_stop(usb_pcwd);
811
812         /* We should now stop communicating with the USB PCWD device */
813         usb_pcwd->exists = 0;
814
815         /* Deregister */
816         misc_deregister(&usb_pcwd_miscdev);
817         misc_deregister(&usb_pcwd_temperature_miscdev);
818         unregister_reboot_notifier(&usb_pcwd_notifier);
819
820         mutex_unlock(&usb_pcwd->mtx);
821
822         /* Delete the USB PCWD device */
823         usb_pcwd_delete(usb_pcwd);
824
825         cards_found--;
826
827         mutex_unlock(&disconnect_mutex);
828
829         pr_info("USB PC Watchdog disconnected\n");
830 }
831
832 module_usb_driver(usb_pcwd_driver);