git.oblomov.eu Git - linux-2.6/blob - drivers/char/watchdog/pcwd_usb.c

   1 /*
   2  *      Berkshire USB-PC Watchdog Card Driver
   3  *
   4  *      (c) Copyright 2004 Wim Van Sebroeck <wim@iguana.be>.
   5  *
   6  *      Based on source code of the following authors:
   7  *        Ken Hollis <kenji@bitgate.com>,
   8  *        Alan Cox <alan@redhat.com>,
   9  *        Matt Domsch <Matt_Domsch@dell.com>,
  10  *        Rob Radez <rob@osinvestor.com>,
  11  *        Greg Kroah-Hartman <greg@kroah.com>
  12  *
  13  *      This program is free software; you can redistribute it and/or
  14  *      modify it under the terms of the GNU General Public License
  15  *      as published by the Free Software Foundation; either version
  16  *      2 of the License, or (at your option) any later version.
  17  *
  18  *      Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
  19  *      provide warranty for any of this software. This material is
  20  *      provided "AS-IS" and at no charge.
  21  *
  22  *      Thanks also to Simon Machell at Berkshire Products Inc. for
  23  *      providing the test hardware. More info is available at
  24  *      http://www.berkprod.com/ or http://www.pcwatchdog.com/
  25  */
  26
  27 #include <linux/config.h>
  28 #include <linux/kernel.h>
  29 #include <linux/errno.h>
  30 #include <linux/init.h>
  31 #include <linux/slab.h>
  32 #include <linux/module.h>
  33 #include <linux/moduleparam.h>
  34 #include <linux/types.h>
  35 #include <linux/delay.h>
  36 #include <linux/miscdevice.h>
  37 #include <linux/watchdog.h>
  38 #include <linux/notifier.h>
  39 #include <linux/reboot.h>
  40 #include <linux/fs.h>
  41 #include <linux/smp_lock.h>
  42 #include <linux/completion.h>
  43 #include <asm/uaccess.h>
  44 #include <linux/usb.h>
  45 #include <linux/mutex.h>
  46
  47
  48 #ifdef CONFIG_USB_DEBUG
  49         static int debug = 1;
  50 #else
  51         static int debug;
  52 #endif
  53
  54 /* Use our own dbg macro */
  55 #undef dbg
  56 #define dbg(format, arg...) do { if (debug) printk(KERN_DEBUG PFX format "\n" , ## arg); } while (0)
  57
  58
  59 /* Module and Version Information */
  60 #define DRIVER_VERSION "1.01"
  61 #define DRIVER_DATE "15 Mar 2005"
  62 #define DRIVER_AUTHOR "Wim Van Sebroeck <wim@iguana.be>"
  63 #define DRIVER_DESC "Berkshire USB-PC Watchdog driver"
  64 #define DRIVER_LICENSE "GPL"
  65 #define DRIVER_NAME "pcwd_usb"
  66 #define PFX DRIVER_NAME ": "
  67
  68 MODULE_AUTHOR(DRIVER_AUTHOR);
  69 MODULE_DESCRIPTION(DRIVER_DESC);
  70 MODULE_LICENSE(DRIVER_LICENSE);
  71 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
  72 MODULE_ALIAS_MISCDEV(TEMP_MINOR);
  73
  74 /* Module Parameters */
  75 module_param(debug, int, 0);
  76 MODULE_PARM_DESC(debug, "Debug enabled or not");
  77
  78 #define WATCHDOG_HEARTBEAT 2    /* 2 sec default heartbeat */
  79 static int heartbeat = WATCHDOG_HEARTBEAT;
  80 module_param(heartbeat, int, 0);
  81 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
  82
  83 static int nowayout = WATCHDOG_NOWAYOUT;
  84 module_param(nowayout, int, 0);
  85 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
  86
  87 /* The vendor and product id's for the USB-PC Watchdog card */
  88 #define USB_PCWD_VENDOR_ID      0x0c98
  89 #define USB_PCWD_PRODUCT_ID     0x1140
  90
  91 /* table of devices that work with this driver */
  92 static struct usb_device_id usb_pcwd_table [] = {
  93         { USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) },
  94         { }                                     /* Terminating entry */
  95 };
  96 MODULE_DEVICE_TABLE (usb, usb_pcwd_table);
  97
  98 /* according to documentation max. time to process a command for the USB
  99  * watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */
 100 #define USB_COMMAND_TIMEOUT     250
 101
 102 /* Watchdog's internal commands */
 103 #define CMD_READ_TEMP                   0x02    /* Read Temperature; Re-trigger Watchdog */
 104 #define CMD_TRIGGER                     CMD_READ_TEMP
 105 #define CMD_GET_STATUS                  0x04    /* Get Status Information */
 106 #define CMD_GET_FIRMWARE_VERSION        0x08    /* Get Firmware Version */
 107 #define CMD_GET_DIP_SWITCH_SETTINGS     0x0c    /* Get Dip Switch Settings */
 108 #define CMD_READ_WATCHDOG_TIMEOUT       0x18    /* Read Current Watchdog Time */
 109 #define CMD_WRITE_WATCHDOG_TIMEOUT      0x19    /* Write Current Watchdog Time */
 110 #define CMD_ENABLE_WATCHDOG             0x30    /* Enable / Disable Watchdog */
 111 #define CMD_DISABLE_WATCHDOG            CMD_ENABLE_WATCHDOG
 112
 113 /* Some defines that I like to be somewhere else like include/linux/usb_hid.h */
 114 #define HID_REQ_SET_REPORT              0x09
 115 #define HID_DT_REPORT                   (USB_TYPE_CLASS | 0x02)
 116
 117 /* We can only use 1 card due to the /dev/watchdog restriction */
 118 static int cards_found;
 119
 120 /* some internal variables */
 121 static unsigned long is_active;
 122 static char expect_release;
 123
 124 /* Structure to hold all of our device specific stuff */
 125 struct usb_pcwd_private {
 126         struct usb_device *     udev;                   /* save off the usb device pointer */
 127         struct usb_interface *  interface;              /* the interface for this device */
 128
 129         unsigned int            interface_number;       /* the interface number used for cmd's */
 130
 131         unsigned char *         intr_buffer;            /* the buffer to intr data */
 132         dma_addr_t              intr_dma;               /* the dma address for the intr buffer */
 133         size_t                  intr_size;              /* the size of the intr buffer */
 134         struct urb *            intr_urb;               /* the urb used for the intr pipe */
 135
 136         unsigned char           cmd_command;            /* The command that is reported back */
 137         unsigned char           cmd_data_msb;           /* The data MSB that is reported back */
 138         unsigned char           cmd_data_lsb;           /* The data LSB that is reported back */
 139         atomic_t                cmd_received;           /* true if we received a report after a command */
 140
 141         int                     exists;                 /* Wether or not the device exists */
 142         struct semaphore        sem;                    /* locks this structure */
 143 };
 144 static struct usb_pcwd_private *usb_pcwd_device;
 145
 146 /* prevent races between open() and disconnect() */
 147 static DEFINE_MUTEX(disconnect_mutex);
 148
 149 /* local function prototypes */
 150 static int usb_pcwd_probe       (struct usb_interface *interface, const struct usb_device_id *id);
 151 static void usb_pcwd_disconnect (struct usb_interface *interface);
 152
 153 /* usb specific object needed to register this driver with the usb subsystem */
 154 static struct usb_driver usb_pcwd_driver = {
 155         .name =         DRIVER_NAME,
 156         .probe =        usb_pcwd_probe,
 157         .disconnect =   usb_pcwd_disconnect,
 158         .id_table =     usb_pcwd_table,
 159 };
 160
 161
 162 static void usb_pcwd_intr_done(struct urb *urb, struct pt_regs *regs)
 163 {
 164         struct usb_pcwd_private *usb_pcwd = (struct usb_pcwd_private *)urb->context;
 165         unsigned char *data = usb_pcwd->intr_buffer;
 166         int retval;
 167
 168         switch (urb->status) {
 169         case 0:                 /* success */
 170                 break;
 171         case -ECONNRESET:       /* unlink */
 172         case -ENOENT:
 173         case -ESHUTDOWN:
 174                 /* this urb is terminated, clean up */
 175                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 176                 return;
 177         /* -EPIPE:  should clear the halt */
 178         default:                /* error */
 179                 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
 180                 goto resubmit;
 181         }
 182
 183         dbg("received following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
 184                 data[0], data[1], data[2]);
 185
 186         usb_pcwd->cmd_command  = data[0];
 187         usb_pcwd->cmd_data_msb = data[1];
 188         usb_pcwd->cmd_data_lsb = data[2];
 189
 190         /* notify anyone waiting that the cmd has finished */
 191         atomic_set (&usb_pcwd->cmd_received, 1);
 192
 193 resubmit:
 194         retval = usb_submit_urb (urb, GFP_ATOMIC);
 195         if (retval)
 196                 printk(KERN_ERR PFX "can't resubmit intr, usb_submit_urb failed with result %d\n",
 197                         retval);
 198 }
 199
 200 static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd, unsigned char cmd,
 201         unsigned char *msb, unsigned char *lsb)
 202 {
 203         int got_response, count;
 204         unsigned char buf[6];
 205
 206         /* We will not send any commands if the USB PCWD device does not exist */
 207         if ((!usb_pcwd) || (!usb_pcwd->exists))
 208                 return -1;
 209
 210         /* The USB PC Watchdog uses a 6 byte report format. The board currently uses
 211          * only 3 of the six bytes of the report. */
 212         buf[0] = cmd;                   /* Byte 0 = CMD */
 213         buf[1] = *msb;                  /* Byte 1 = Data MSB */
 214         buf[2] = *lsb;                  /* Byte 2 = Data LSB */
 215         buf[3] = buf[4] = buf[5] = 0;   /* All other bytes not used */
 216
 217         dbg("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
 218                 buf[0], buf[1], buf[2]);
 219
 220         atomic_set (&usb_pcwd->cmd_received, 0);
 221
 222         if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0),
 223                         HID_REQ_SET_REPORT, HID_DT_REPORT,
 224                         0x0200, usb_pcwd->interface_number, buf, sizeof(buf),
 225                         USB_COMMAND_TIMEOUT) != sizeof(buf)) {
 226                 dbg("usb_pcwd_send_command: error in usb_control_msg for cmd 0x%x 0x%x 0x%x\n", cmd, *msb, *lsb);
 227         }
 228         /* wait till the usb card processed the command,
 229          * with a max. timeout of USB_COMMAND_TIMEOUT */
 230         got_response = 0;
 231         for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response); count++) {
 232                 mdelay(1);
 233                 if (atomic_read (&usb_pcwd->cmd_received))
 234                         got_response = 1;
 235         }
 236
 237         if ((got_response) && (cmd == usb_pcwd->cmd_command)) {
 238                 /* read back response */
 239                 *msb = usb_pcwd->cmd_data_msb;
 240                 *lsb = usb_pcwd->cmd_data_lsb;
 241         }
 242
 243         return got_response;
 244 }
 245
 246 static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd)
 247 {
 248         unsigned char msb = 0x00;
 249         unsigned char lsb = 0x00;
 250         int retval;
 251
 252         /* Enable Watchdog */
 253         retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG, &msb, &lsb);
 254
 255         if ((retval == 0) || (lsb == 0)) {
 256                 printk(KERN_ERR PFX "Card did not acknowledge enable attempt\n");
 257                 return -1;
 258         }
 259
 260         return 0;
 261 }
 262
 263 static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd)
 264 {
 265         unsigned char msb = 0xA5;
 266         unsigned char lsb = 0xC3;
 267         int retval;
 268
 269         /* Disable Watchdog */
 270         retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG, &msb, &lsb);
 271
 272         if ((retval == 0) || (lsb != 0)) {
 273                 printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n");
 274                 return -1;
 275         }
 276
 277         return 0;
 278 }
 279
 280 static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd)
 281 {
 282         unsigned char dummy;
 283
 284         /* Re-trigger Watchdog */
 285         usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy);
 286
 287         return 0;
 288 }
 289
 290 static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t)
 291 {
 292         unsigned char msb = t / 256;
 293         unsigned char lsb = t % 256;
 294
 295         if ((t < 0x0001) || (t > 0xFFFF))
 296                 return -EINVAL;
 297
 298         /* Write new heartbeat to watchdog */
 299         usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb);
 300
 301         heartbeat = t;
 302         return 0;
 303 }
 304
 305 static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd, int *temperature)
 306 {
 307         unsigned char msb, lsb;
 308
 309         usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb);
 310
 311         /*
 312          * Convert celsius to fahrenheit, since this was
 313          * the decided 'standard' for this return value.
 314          */
 315         *temperature = (lsb * 9 / 5) + 32;
 316
 317         return 0;
 318 }
 319
 320 static int usb_pcwd_get_timeleft(struct usb_pcwd_private *usb_pcwd, int *time_left)
 321 {
 322         unsigned char msb, lsb;
 323
 324         /* Read the time that's left before rebooting */
 325         /* Note: if the board is not yet armed then we will read 0xFFFF */
 326         usb_pcwd_send_command(usb_pcwd, CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
 327
 328         *time_left = (msb << 8) + lsb;
 329
 330         return 0;
 331 }
 332
 333 /*
 334  *      /dev/watchdog handling
 335  */
 336
 337 static ssize_t usb_pcwd_write(struct file *file, const char __user *data,
 338                               size_t len, loff_t *ppos)
 339 {
 340         /* See if we got the magic character 'V' and reload the timer */
 341         if (len) {
 342                 if (!nowayout) {
 343                         size_t i;
 344
 345                         /* note: just in case someone wrote the magic character
 346                          * five months ago... */
 347                         expect_release = 0;
 348
 349                         /* scan to see whether or not we got the magic character */
 350                         for (i = 0; i != len; i++) {
 351                                 char c;
 352                                 if(get_user(c, data+i))
 353                                         return -EFAULT;
 354                                 if (c == 'V')
 355                                         expect_release = 42;
 356                         }
 357                 }
 358
 359                 /* someone wrote to us, we should reload the timer */
 360                 usb_pcwd_keepalive(usb_pcwd_device);
 361         }
 362         return len;
 363 }
 364
 365 static int usb_pcwd_ioctl(struct inode *inode, struct file *file,
 366                           unsigned int cmd, unsigned long arg)
 367 {
 368         void __user *argp = (void __user *)arg;
 369         int __user *p = argp;
 370         static struct watchdog_info ident = {
 371                 .options =              WDIOF_KEEPALIVEPING |
 372                                         WDIOF_SETTIMEOUT |
 373                                         WDIOF_MAGICCLOSE,
 374                 .firmware_version =     1,
 375                 .identity =             DRIVER_NAME,
 376         };
 377
 378         switch (cmd) {
 379                 case WDIOC_GETSUPPORT:
 380                         return copy_to_user(argp, &ident,
 381                                 sizeof (ident)) ? -EFAULT : 0;
 382
 383                 case WDIOC_GETSTATUS:
 384                 case WDIOC_GETBOOTSTATUS:
 385                         return put_user(0, p);
 386
 387                 case WDIOC_GETTEMP:
 388                 {
 389                         int temperature;
 390
 391                         if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
 392                                 return -EFAULT;
 393
 394                         return put_user(temperature, p);
 395                 }
 396
 397                 case WDIOC_KEEPALIVE:
 398                         usb_pcwd_keepalive(usb_pcwd_device);
 399                         return 0;
 400
 401                 case WDIOC_SETOPTIONS:
 402                 {
 403                         int new_options, retval = -EINVAL;
 404
 405                         if (get_user (new_options, p))
 406                                 return -EFAULT;
 407
 408                         if (new_options & WDIOS_DISABLECARD) {
 409                                 usb_pcwd_stop(usb_pcwd_device);
 410                                 retval = 0;
 411                         }
 412
 413                         if (new_options & WDIOS_ENABLECARD) {
 414                                 usb_pcwd_start(usb_pcwd_device);
 415                                 retval = 0;
 416                         }
 417
 418                         return retval;
 419                 }
 420
 421                 case WDIOC_SETTIMEOUT:
 422                 {
 423                         int new_heartbeat;
 424
 425                         if (get_user(new_heartbeat, p))
 426                                 return -EFAULT;
 427
 428                         if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat))
 429                             return -EINVAL;
 430
 431                         usb_pcwd_keepalive(usb_pcwd_device);
 432                         /* Fall */
 433                 }
 434
 435                 case WDIOC_GETTIMEOUT:
 436                         return put_user(heartbeat, p);
 437
 438                 case WDIOC_GETTIMELEFT:
 439                 {
 440                         int time_left;
 441
 442                         if (usb_pcwd_get_timeleft(usb_pcwd_device, &time_left))
 443                                 return -EFAULT;
 444
 445                         return put_user(time_left, p);
 446                 }
 447
 448                 default:
 449                         return -ENOIOCTLCMD;
 450         }
 451 }
 452
 453 static int usb_pcwd_open(struct inode *inode, struct file *file)
 454 {
 455         /* /dev/watchdog can only be opened once */
 456         if (test_and_set_bit(0, &is_active))
 457                 return -EBUSY;
 458
 459         /* Activate */
 460         usb_pcwd_start(usb_pcwd_device);
 461         usb_pcwd_keepalive(usb_pcwd_device);
 462         return nonseekable_open(inode, file);
 463 }
 464
 465 static int usb_pcwd_release(struct inode *inode, struct file *file)
 466 {
 467         /*
 468          *      Shut off the timer.
 469          */
 470         if (expect_release == 42) {
 471                 usb_pcwd_stop(usb_pcwd_device);
 472         } else {
 473                 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
 474                 usb_pcwd_keepalive(usb_pcwd_device);
 475         }
 476         expect_release = 0;
 477         clear_bit(0, &is_active);
 478         return 0;
 479 }
 480
 481 /*
 482  *      /dev/temperature handling
 483  */
 484
 485 static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data,
 486                                 size_t len, loff_t *ppos)
 487 {
 488         int temperature;
 489
 490         if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
 491                 return -EFAULT;
 492
 493         if (copy_to_user(data, &temperature, 1))
 494                 return -EFAULT;
 495
 496         return 1;
 497 }
 498
 499 static int usb_pcwd_temperature_open(struct inode *inode, struct file *file)
 500 {
 501         return nonseekable_open(inode, file);
 502 }
 503
 504 static int usb_pcwd_temperature_release(struct inode *inode, struct file *file)
 505 {
 506         return 0;
 507 }
 508
 509 /*
 510  *      Notify system
 511  */
 512
 513 static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
 514 {
 515         if (code==SYS_DOWN || code==SYS_HALT) {
 516                 /* Turn the WDT off */
 517                 usb_pcwd_stop(usb_pcwd_device);
 518         }
 519
 520         return NOTIFY_DONE;
 521 }
 522
 523 /*
 524  *      Kernel Interfaces
 525  */
 526
 527 static struct file_operations usb_pcwd_fops = {
 528         .owner =        THIS_MODULE,
 529         .llseek =       no_llseek,
 530         .write =        usb_pcwd_write,
 531         .ioctl =        usb_pcwd_ioctl,
 532         .open =         usb_pcwd_open,
 533         .release =      usb_pcwd_release,
 534 };
 535
 536 static struct miscdevice usb_pcwd_miscdev = {
 537         .minor =        WATCHDOG_MINOR,
 538         .name =         "watchdog",
 539         .fops =         &usb_pcwd_fops,
 540 };
 541
 542 static struct file_operations usb_pcwd_temperature_fops = {
 543         .owner =        THIS_MODULE,
 544         .llseek =       no_llseek,
 545         .read =         usb_pcwd_temperature_read,
 546         .open =         usb_pcwd_temperature_open,
 547         .release =      usb_pcwd_temperature_release,
 548 };
 549
 550 static struct miscdevice usb_pcwd_temperature_miscdev = {
 551         .minor =        TEMP_MINOR,
 552         .name =         "temperature",
 553         .fops =         &usb_pcwd_temperature_fops,
 554 };
 555
 556 static struct notifier_block usb_pcwd_notifier = {
 557         .notifier_call =        usb_pcwd_notify_sys,
 558 };
 559
 560 /**
 561  *      usb_pcwd_delete
 562  */
 563 static inline void usb_pcwd_delete (struct usb_pcwd_private *usb_pcwd)
 564 {
 565         if (usb_pcwd->intr_urb != NULL)
 566                 usb_free_urb (usb_pcwd->intr_urb);
 567         if (usb_pcwd->intr_buffer != NULL)
 568                 usb_buffer_free(usb_pcwd->udev, usb_pcwd->intr_size,
 569                                 usb_pcwd->intr_buffer, usb_pcwd->intr_dma);
 570         kfree (usb_pcwd);
 571 }
 572
 573 /**
 574  *      usb_pcwd_probe
 575  *
 576  *      Called by the usb core when a new device is connected that it thinks
 577  *      this driver might be interested in.
 578  */
 579 static int usb_pcwd_probe(struct usb_interface *interface, const struct usb_device_id *id)
 580 {
 581         struct usb_device *udev = interface_to_usbdev(interface);
 582         struct usb_host_interface *iface_desc;
 583         struct usb_endpoint_descriptor *endpoint;
 584         struct usb_pcwd_private *usb_pcwd = NULL;
 585         int pipe, maxp;
 586         int retval = -ENOMEM;
 587         int got_fw_rev;
 588         unsigned char fw_rev_major, fw_rev_minor;
 589         char fw_ver_str[20];
 590         unsigned char option_switches, dummy;
 591
 592         cards_found++;
 593         if (cards_found > 1) {
 594                 printk(KERN_ERR PFX "This driver only supports 1 device\n");
 595                 return -ENODEV;
 596         }
 597
 598         /* get the active interface descriptor */
 599         iface_desc = interface->cur_altsetting;
 600
 601         /* check out that we have a HID device */
 602         if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) {
 603                 printk(KERN_ERR PFX "The device isn't a Human Interface Device\n");
 604                 return -ENODEV;
 605         }
 606
 607         /* check out the endpoint: it has to be Interrupt & IN */
 608         endpoint = &iface_desc->endpoint[0].desc;
 609
 610         if (!((endpoint->bEndpointAddress & USB_DIR_IN) &&
 611              ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 612                                 == USB_ENDPOINT_XFER_INT))) {
 613                 /* we didn't find a Interrupt endpoint with direction IN */
 614                 printk(KERN_ERR PFX "Couldn't find an INTR & IN endpoint\n");
 615                 return -ENODEV;
 616         }
 617
 618         /* get a handle to the interrupt data pipe */
 619         pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
 620         maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
 621
 622         /* allocate memory for our device and initialize it */
 623         usb_pcwd = kmalloc (sizeof(struct usb_pcwd_private), GFP_KERNEL);
 624         if (usb_pcwd == NULL) {
 625                 printk(KERN_ERR PFX "Out of memory\n");
 626                 goto error;
 627         }
 628         memset (usb_pcwd, 0x00, sizeof (*usb_pcwd));
 629
 630         usb_pcwd_device = usb_pcwd;
 631
 632         init_MUTEX (&usb_pcwd->sem);
 633         usb_pcwd->udev = udev;
 634         usb_pcwd->interface = interface;
 635         usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber;
 636         usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ? le16_to_cpu(endpoint->wMaxPacketSize) : 8);
 637
 638         /* set up the memory buffer's */
 639         if (!(usb_pcwd->intr_buffer = usb_buffer_alloc(udev, usb_pcwd->intr_size, SLAB_ATOMIC, &usb_pcwd->intr_dma))) {
 640                 printk(KERN_ERR PFX "Out of memory\n");
 641                 goto error;
 642         }
 643
 644         /* allocate the urb's */
 645         usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
 646         if (!usb_pcwd->intr_urb) {
 647                 printk(KERN_ERR PFX "Out of memory\n");
 648                 goto error;
 649         }
 650
 651         /* initialise the intr urb's */
 652         usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe,
 653                         usb_pcwd->intr_buffer, usb_pcwd->intr_size,
 654                         usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval);
 655         usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma;
 656         usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 657
 658         /* register our interrupt URB with the USB system */
 659         if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) {
 660                 printk(KERN_ERR PFX "Problem registering interrupt URB\n");
 661                 retval = -EIO; /* failure */
 662                 goto error;
 663         }
 664
 665         /* The device exists and can be communicated with */
 666         usb_pcwd->exists = 1;
 667
 668         /* disable card */
 669         usb_pcwd_stop(usb_pcwd);
 670
 671         /* Get the Firmware Version */
 672         got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor);
 673         if (got_fw_rev) {
 674                 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
 675         } else {
 676                 sprintf(fw_ver_str, "<card no answer>");
 677         }
 678
 679         printk(KERN_INFO PFX "Found card (Firmware: %s) with temp option\n",
 680                 fw_ver_str);
 681
 682         /* Get switch settings */
 683         usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy, &option_switches);
 684
 685         printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
 686                 option_switches,
 687                 ((option_switches & 0x10) ? "ON" : "OFF"),
 688                 ((option_switches & 0x08) ? "ON" : "OFF"));
 689
 690         /* Check that the heartbeat value is within it's range ; if not reset to the default */
 691         if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) {
 692                 usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT);
 693                 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
 694                         WATCHDOG_HEARTBEAT);
 695         }
 696
 697         retval = register_reboot_notifier(&usb_pcwd_notifier);
 698         if (retval != 0) {
 699                 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
 700                         retval);
 701                 goto error;
 702         }
 703
 704         retval = misc_register(&usb_pcwd_temperature_miscdev);
 705         if (retval != 0) {
 706                 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 707                         TEMP_MINOR, retval);
 708                 goto err_out_unregister_reboot;
 709         }
 710
 711         retval = misc_register(&usb_pcwd_miscdev);
 712         if (retval != 0) {
 713                 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 714                         WATCHDOG_MINOR, retval);
 715                 goto err_out_misc_deregister;
 716         }
 717
 718         /* we can register the device now, as it is ready */
 719         usb_set_intfdata (interface, usb_pcwd);
 720
 721         printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
 722                 heartbeat, nowayout);
 723
 724         return 0;
 725
 726 err_out_misc_deregister:
 727         misc_deregister(&usb_pcwd_temperature_miscdev);
 728 err_out_unregister_reboot:
 729         unregister_reboot_notifier(&usb_pcwd_notifier);
 730 error:
 731         if (usb_pcwd)
 732                 usb_pcwd_delete(usb_pcwd);
 733         usb_pcwd_device = NULL;
 734         return retval;
 735 }
 736
 737
 738 /**
 739  *      usb_pcwd_disconnect
 740  *
 741  *      Called by the usb core when the device is removed from the system.
 742  *
 743  *      This routine guarantees that the driver will not submit any more urbs
 744  *      by clearing dev->udev.
 745  */
 746 static void usb_pcwd_disconnect(struct usb_interface *interface)
 747 {
 748         struct usb_pcwd_private *usb_pcwd;
 749
 750         /* prevent races with open() */
 751         mutex_lock(&disconnect_mutex);
 752
 753         usb_pcwd = usb_get_intfdata (interface);
 754         usb_set_intfdata (interface, NULL);
 755
 756         down (&usb_pcwd->sem);
 757
 758         /* Stop the timer before we leave */
 759         if (!nowayout)
 760                 usb_pcwd_stop(usb_pcwd);
 761
 762         /* We should now stop communicating with the USB PCWD device */
 763         usb_pcwd->exists = 0;
 764
 765         /* Deregister */
 766         misc_deregister(&usb_pcwd_miscdev);
 767         misc_deregister(&usb_pcwd_temperature_miscdev);
 768         unregister_reboot_notifier(&usb_pcwd_notifier);
 769
 770         up (&usb_pcwd->sem);
 771
 772         /* Delete the USB PCWD device */
 773         usb_pcwd_delete(usb_pcwd);
 774
 775         cards_found--;
 776
 777         mutex_unlock(&disconnect_mutex);
 778
 779         printk(KERN_INFO PFX "USB PC Watchdog disconnected\n");
 780 }
 781
 782
 783
 784 /**
 785  *      usb_pcwd_init
 786  */
 787 static int __init usb_pcwd_init(void)
 788 {
 789         int result;
 790
 791         /* register this driver with the USB subsystem */
 792         result = usb_register(&usb_pcwd_driver);
 793         if (result) {
 794                 printk(KERN_ERR PFX "usb_register failed. Error number %d\n",
 795                     result);
 796                 return result;
 797         }
 798
 799         printk(KERN_INFO PFX DRIVER_DESC " v" DRIVER_VERSION " (" DRIVER_DATE ")\n");
 800         return 0;
 801 }
 802
 803
 804 /**
 805  *      usb_pcwd_exit
 806  */
 807 static void __exit usb_pcwd_exit(void)
 808 {
 809         /* deregister this driver with the USB subsystem */
 810         usb_deregister(&usb_pcwd_driver);
 811 }
 812
 813
 814 module_init (usb_pcwd_init);
 815 module_exit (usb_pcwd_exit);