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#include <linux/module.h> /* For module specific items */ 28#include <linux/moduleparam.h> /* For new moduleparam's */ 29#include <linux/types.h> /* For standard types (like size_t) */ 30#include <linux/errno.h> /* For the -ENODEV/... values */ 31#include <linux/kernel.h> /* For printk/panic/... */ 32#include <linux/delay.h> /* For mdelay function */ 33#include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */ 34#include <linux/watchdog.h> /* For the watchdog specific items */ 35#include <linux/notifier.h> /* For notifier support */ 36#include <linux/reboot.h> /* For reboot_notifier stuff */ 37#include <linux/init.h> /* For __init/__exit/... */ 38#include <linux/fs.h> /* For file operations */ 39#include <linux/usb.h> /* For USB functions */ 40#include <linux/slab.h> /* For kmalloc, ... */ 41#include <linux/mutex.h> /* For mutex locking */ 42#include <linux/hid.h> /* For HID_REQ_SET_REPORT & HID_DT_REPORT */ 43#include <linux/uaccess.h> /* For copy_to_user/put_user/... */ 44 45 46#ifdef CONFIG_USB_DEBUG 47 static int debug = 1; 48#else 49 static int debug; 50#endif 51 52/* Use our own dbg macro */ 53#undef dbg 54#define dbg(format, arg...) \ 55 do { if (debug) printk(KERN_DEBUG PFX format "\n" , ## arg); } while (0) 56 57/* Module and Version Information */ 58#define DRIVER_VERSION "1.02" 59#define DRIVER_AUTHOR "Wim Van Sebroeck <wim@iguana.be>" 60#define DRIVER_DESC "Berkshire USB-PC Watchdog driver" 61#define DRIVER_LICENSE "GPL" 62#define DRIVER_NAME "pcwd_usb" 63#define PFX DRIVER_NAME ": " 64 65MODULE_AUTHOR(DRIVER_AUTHOR); 66MODULE_DESCRIPTION(DRIVER_DESC); 67MODULE_LICENSE(DRIVER_LICENSE); 68MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); 69MODULE_ALIAS_MISCDEV(TEMP_MINOR); 70 71/* Module Parameters */ 72module_param(debug, int, 0); 73MODULE_PARM_DESC(debug, "Debug enabled or not"); 74 75#define WATCHDOG_HEARTBEAT 0 /* default heartbeat = 76 delay-time from dip-switches */ 77static int heartbeat = WATCHDOG_HEARTBEAT; 78module_param(heartbeat, int, 0); 79MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. " 80 "(0<heartbeat<65536 or 0=delay-time from dip-switches, default=" 81 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); 82 83static int nowayout = WATCHDOG_NOWAYOUT; 84module_param(nowayout, int, 0); 85MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" 86 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); 87 88/* The vendor and product id's for the USB-PC Watchdog card */ 89#define USB_PCWD_VENDOR_ID 0x0c98 90#define USB_PCWD_PRODUCT_ID 0x1140 91 92/* table of devices that work with this driver */ 93static struct usb_device_id usb_pcwd_table[] = { 94 { USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) }, 95 { } /* Terminating entry */ 96}; 97MODULE_DEVICE_TABLE(usb, usb_pcwd_table); 98 99/* according to documentation max. time to process a command for the USB 100 * watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */ 101#define USB_COMMAND_TIMEOUT 250 102 103/* Watchdog's internal commands */ 104#define CMD_READ_TEMP 0x02 /* Read Temperature; 105 Re-trigger Watchdog */ 106#define CMD_TRIGGER CMD_READ_TEMP 107#define CMD_GET_STATUS 0x04 /* Get Status Information */ 108#define CMD_GET_FIRMWARE_VERSION 0x08 /* Get Firmware Version */ 109#define CMD_GET_DIP_SWITCH_SETTINGS 0x0c /* Get Dip Switch Settings */ 110#define CMD_READ_WATCHDOG_TIMEOUT 0x18 /* Read Current Watchdog Time */ 111#define CMD_WRITE_WATCHDOG_TIMEOUT 0x19 /* Write Current WatchdogTime */ 112#define CMD_ENABLE_WATCHDOG 0x30 /* Enable / Disable Watchdog */ 113#define CMD_DISABLE_WATCHDOG CMD_ENABLE_WATCHDOG 114 115/* Watchdog's Dip Switch heartbeat values */ 116static const int heartbeat_tbl[] = { 117 5, /* OFF-OFF-OFF = 5 Sec */ 118 10, /* OFF-OFF-ON = 10 Sec */ 119 30, /* OFF-ON-OFF = 30 Sec */ 120 60, /* OFF-ON-ON = 1 Min */ 121 300, /* ON-OFF-OFF = 5 Min */ 122 600, /* ON-OFF-ON = 10 Min */ 123 1800, /* ON-ON-OFF = 30 Min */ 124 3600, /* ON-ON-ON = 1 hour */ 125}; 126 127/* We can only use 1 card due to the /dev/watchdog restriction */ 128static int cards_found; 129 130/* some internal variables */ 131static unsigned long is_active; 132static char expect_release; 133 134/* Structure to hold all of our device specific stuff */ 135struct usb_pcwd_private { 136 /* save off the usb device pointer */ 137 struct usb_device *udev; 138 /* the interface for this device */ 139 struct usb_interface *interface; 140 141 /* the interface number used for cmd's */ 142 unsigned int interface_number; 143 144 /* the buffer to intr data */ 145 unsigned char *intr_buffer; 146 /* the dma address for the intr buffer */ 147 dma_addr_t intr_dma; 148 /* the size of the intr buffer */ 149 size_t intr_size; 150 /* the urb used for the intr pipe */ 151 struct urb *intr_urb; 152 153 /* The command that is reported back */ 154 unsigned char cmd_command; 155 /* The data MSB that is reported back */ 156 unsigned char cmd_data_msb; 157 /* The data LSB that is reported back */ 158 unsigned char cmd_data_lsb; 159 /* true if we received a report after a command */ 160 atomic_t cmd_received; 161 162 /* Wether or not the device exists */ 163 int exists; 164 /* locks this structure */ 165 struct mutex mtx; 166}; 167static struct usb_pcwd_private *usb_pcwd_device; 168 169/* prevent races between open() and disconnect() */ 170static DEFINE_MUTEX(disconnect_mutex); 171 172/* local function prototypes */ 173static int usb_pcwd_probe(struct usb_interface *interface, 174 const struct usb_device_id *id); 175static void usb_pcwd_disconnect(struct usb_interface *interface); 176 177/* usb specific object needed to register this driver with the usb subsystem */ 178static struct usb_driver usb_pcwd_driver = { 179 .name = DRIVER_NAME, 180 .probe = usb_pcwd_probe, 181 .disconnect = usb_pcwd_disconnect, 182 .id_table = usb_pcwd_table, 183}; 184 185 186static void usb_pcwd_intr_done(struct urb *urb) 187{ 188 struct usb_pcwd_private *usb_pcwd = 189 (struct usb_pcwd_private *)urb->context; 190 unsigned char *data = usb_pcwd->intr_buffer; 191 int retval; 192 193 switch (urb->status) { 194 case 0: /* success */ 195 break; 196 case -ECONNRESET: /* unlink */ 197 case -ENOENT: 198 case -ESHUTDOWN: 199 /* this urb is terminated, clean up */ 200 dbg("%s - urb shutting down with status: %d", __func__, 201 urb->status); 202 return; 203 /* -EPIPE: should clear the halt */ 204 default: /* error */ 205 dbg("%s - nonzero urb status received: %d", __func__, 206 urb->status); 207 goto resubmit; 208 } 209 210 dbg("received following data cmd=0x%02x msb=0x%02x lsb=0x%02x", 211 data[0], data[1], data[2]); 212 213 usb_pcwd->cmd_command = data[0]; 214 usb_pcwd->cmd_data_msb = data[1]; 215 usb_pcwd->cmd_data_lsb = data[2]; 216 217 /* notify anyone waiting that the cmd has finished */ 218 atomic_set(&usb_pcwd->cmd_received, 1); 219 220resubmit: 221 retval = usb_submit_urb(urb, GFP_ATOMIC); 222 if (retval) 223 printk(KERN_ERR PFX "can't resubmit intr, " 224 "usb_submit_urb failed with result %d\n", retval); 225} 226 227static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd, 228 unsigned char cmd, unsigned char *msb, unsigned char *lsb) 229{ 230 int got_response, count; 231 unsigned char buf[6]; 232 233 /* We will not send any commands if the USB PCWD device does 234 * not exist */ 235 if ((!usb_pcwd) || (!usb_pcwd->exists)) 236 return -1; 237 238 /* The USB PC Watchdog uses a 6 byte report format. 239 * The board currently uses only 3 of the six bytes of the report. */ 240 buf[0] = cmd; /* Byte 0 = CMD */ 241 buf[1] = *msb; /* Byte 1 = Data MSB */ 242 buf[2] = *lsb; /* Byte 2 = Data LSB */ 243 buf[3] = buf[4] = buf[5] = 0; /* All other bytes not used */ 244 245 dbg("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x", 246 buf[0], buf[1], buf[2]); 247 248 atomic_set(&usb_pcwd->cmd_received, 0); 249 250 if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0), 251 HID_REQ_SET_REPORT, HID_DT_REPORT, 252 0x0200, usb_pcwd->interface_number, buf, sizeof(buf), 253 USB_COMMAND_TIMEOUT) != sizeof(buf)) { 254 dbg("usb_pcwd_send_command: error in usb_control_msg for " 255 "cmd 0x%x 0x%x 0x%x\n", cmd, *msb, *lsb); 256 } 257 /* wait till the usb card processed the command, 258 * with a max. timeout of USB_COMMAND_TIMEOUT */ 259 got_response = 0; 260 for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response); 261 count++) { 262 mdelay(1); 263 if (atomic_read(&usb_pcwd->cmd_received)) 264 got_response = 1; 265 } 266 267 if ((got_response) && (cmd == usb_pcwd->cmd_command)) { 268 /* read back response */ 269 *msb = usb_pcwd->cmd_data_msb; 270 *lsb = usb_pcwd->cmd_data_lsb; 271 } 272 273 return got_response; 274} 275 276static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd) 277{ 278 unsigned char msb = 0x00; 279 unsigned char lsb = 0x00; 280 int retval; 281 282 /* Enable Watchdog */ 283 retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG, 284 &msb, &lsb); 285 286 if ((retval == 0) || (lsb == 0)) { 287 printk(KERN_ERR PFX 288 "Card did not acknowledge enable attempt\n"); 289 return -1; 290 } 291 292 return 0; 293} 294 295static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd) 296{ 297 unsigned char msb = 0xA5; 298 unsigned char lsb = 0xC3; 299 int retval; 300 301 /* Disable Watchdog */ 302 retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG, 303 &msb, &lsb); 304 305 if ((retval == 0) || (lsb != 0)) { 306 printk(KERN_ERR PFX 307 "Card did not acknowledge disable attempt\n"); 308 return -1; 309 } 310 311 return 0; 312} 313 314static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd) 315{ 316 unsigned char dummy; 317 318 /* Re-trigger Watchdog */ 319 usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy); 320 321 return 0; 322} 323 324static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t) 325{ 326 unsigned char msb = t / 256; 327 unsigned char lsb = t % 256; 328 329 if ((t < 0x0001) || (t > 0xFFFF)) 330 return -EINVAL; 331 332 /* Write new heartbeat to watchdog */ 333 usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb); 334 335 heartbeat = t; 336 return 0; 337} 338 339static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd, 340 int *temperature) 341{ 342 unsigned char msb, lsb; 343 344 usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb); 345 346 /* 347 * Convert celsius to fahrenheit, since this was 348 * the decided 'standard' for this return value. 349 */ 350 *temperature = (lsb * 9 / 5) + 32; 351 352 return 0; 353} 354 355static int usb_pcwd_get_timeleft(struct usb_pcwd_private *usb_pcwd, 356 int *time_left) 357{ 358 unsigned char msb, lsb; 359 360 /* Read the time that's left before rebooting */ 361 /* Note: if the board is not yet armed then we will read 0xFFFF */ 362 usb_pcwd_send_command(usb_pcwd, CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb); 363 364 *time_left = (msb << 8) + lsb; 365 366 return 0; 367} 368 369/* 370 * /dev/watchdog handling 371 */ 372 373static ssize_t usb_pcwd_write(struct file *file, const char __user *data, 374 size_t len, loff_t *ppos) 375{ 376 /* See if we got the magic character 'V' and reload the timer */ 377 if (len) { 378 if (!nowayout) { 379 size_t i; 380 381 /* note: just in case someone wrote the magic character 382 * five months ago... */ 383 expect_release = 0; 384 385 /* scan to see whether or not we got the 386 * magic character */ 387 for (i = 0; i != len; i++) { 388 char c; 389 if (get_user(c, data + i)) 390 return -EFAULT; 391 if (c == 'V') 392 expect_release = 42; 393 } 394 } 395 396 /* someone wrote to us, we should reload the timer */ 397 usb_pcwd_keepalive(usb_pcwd_device); 398 } 399 return len; 400} 401 402static long usb_pcwd_ioctl(struct file *file, unsigned int cmd, 403 unsigned long arg) 404{ 405 void __user *argp = (void __user *)arg; 406 int __user *p = argp; 407 static const struct watchdog_info ident = { 408 .options = WDIOF_KEEPALIVEPING | 409 WDIOF_SETTIMEOUT | 410 WDIOF_MAGICCLOSE, 411 .firmware_version = 1, 412 .identity = DRIVER_NAME, 413 }; 414 415 switch (cmd) { 416 case WDIOC_GETSUPPORT: 417 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; 418 419 case WDIOC_GETSTATUS: 420 case WDIOC_GETBOOTSTATUS: 421 return put_user(0, p); 422 423 case WDIOC_GETTEMP: 424 { 425 int temperature; 426 427 if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature)) 428 return -EFAULT; 429 430 return put_user(temperature, p); 431 } 432 433 case WDIOC_SETOPTIONS: 434 { 435 int new_options, retval = -EINVAL; 436 437 if (get_user(new_options, p)) 438 return -EFAULT; 439 440 if (new_options & WDIOS_DISABLECARD) { 441 usb_pcwd_stop(usb_pcwd_device); 442 retval = 0; 443 } 444 445 if (new_options & WDIOS_ENABLECARD) { 446 usb_pcwd_start(usb_pcwd_device); 447 retval = 0; 448 } 449 450 return retval; 451 } 452 453 case WDIOC_KEEPALIVE: 454 usb_pcwd_keepalive(usb_pcwd_device); 455 return 0; 456 457 case WDIOC_SETTIMEOUT: 458 { 459 int new_heartbeat; 460 461 if (get_user(new_heartbeat, p)) 462 return -EFAULT; 463 464 if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat)) 465 return -EINVAL; 466 467 usb_pcwd_keepalive(usb_pcwd_device); 468 /* Fall */ 469 } 470 471 case WDIOC_GETTIMEOUT: 472 return put_user(heartbeat, p); 473 474 case WDIOC_GETTIMELEFT: 475 { 476 int time_left; 477 478 if (usb_pcwd_get_timeleft(usb_pcwd_device, &time_left)) 479 return -EFAULT; 480 481 return put_user(time_left, p); 482 } 483 484 default: 485 return -ENOTTY; 486 } 487} 488 489static int usb_pcwd_open(struct inode *inode, struct file *file) 490{ 491 /* /dev/watchdog can only be opened once */ 492 if (test_and_set_bit(0, &is_active)) 493 return -EBUSY; 494 495 /* Activate */ 496 usb_pcwd_start(usb_pcwd_device); 497 usb_pcwd_keepalive(usb_pcwd_device); 498 return nonseekable_open(inode, file); 499} 500 501static int usb_pcwd_release(struct inode *inode, struct file *file) 502{ 503 /* 504 * Shut off the timer. 505 */ 506 if (expect_release == 42) { 507 usb_pcwd_stop(usb_pcwd_device); 508 } else { 509 printk(KERN_CRIT PFX 510 "Unexpected close, not stopping watchdog!\n"); 511 usb_pcwd_keepalive(usb_pcwd_device); 512 } 513 expect_release = 0; 514 clear_bit(0, &is_active); 515 return 0; 516} 517 518/* 519 * /dev/temperature handling 520 */ 521 522static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data, 523 size_t len, loff_t *ppos) 524{ 525 int temperature; 526 527 if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature)) 528 return -EFAULT; 529 530 if (copy_to_user(data, &temperature, 1)) 531 return -EFAULT; 532 533 return 1; 534} 535 536static int usb_pcwd_temperature_open(struct inode *inode, struct file *file) 537{ 538 return nonseekable_open(inode, file); 539} 540 541static int usb_pcwd_temperature_release(struct inode *inode, struct file *file) 542{ 543 return 0; 544} 545 546/* 547 * Notify system 548 */ 549 550static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code, 551 void *unused) 552{ 553 if (code == SYS_DOWN || code == SYS_HALT) 554 usb_pcwd_stop(usb_pcwd_device); /* Turn the WDT off */ 555 556 return NOTIFY_DONE; 557} 558 559/* 560 * Kernel Interfaces 561 */ 562 563static const struct file_operations usb_pcwd_fops = { 564 .owner = THIS_MODULE, 565 .llseek = no_llseek, 566 .write = usb_pcwd_write, 567 .unlocked_ioctl = usb_pcwd_ioctl, 568 .open = usb_pcwd_open, 569 .release = usb_pcwd_release, 570}; 571 572static struct miscdevice usb_pcwd_miscdev = { 573 .minor = WATCHDOG_MINOR, 574 .name = "watchdog", 575 .fops = &usb_pcwd_fops, 576}; 577 578static const struct file_operations usb_pcwd_temperature_fops = { 579 .owner = THIS_MODULE, 580 .llseek = no_llseek, 581 .read = usb_pcwd_temperature_read, 582 .open = usb_pcwd_temperature_open, 583 .release = usb_pcwd_temperature_release, 584}; 585 586static struct miscdevice usb_pcwd_temperature_miscdev = { 587 .minor = TEMP_MINOR, 588 .name = "temperature", 589 .fops = &usb_pcwd_temperature_fops, 590}; 591 592static struct notifier_block usb_pcwd_notifier = { 593 .notifier_call = usb_pcwd_notify_sys, 594}; 595 596/** 597 * usb_pcwd_delete 598 */ 599static inline void usb_pcwd_delete(struct usb_pcwd_private *usb_pcwd) 600{ 601 usb_free_urb(usb_pcwd->intr_urb); 602 if (usb_pcwd->intr_buffer != NULL) 603 usb_free_coherent(usb_pcwd->udev, usb_pcwd->intr_size, 604 usb_pcwd->intr_buffer, usb_pcwd->intr_dma); 605 kfree(usb_pcwd); 606} 607 608/** 609 * usb_pcwd_probe 610 * 611 * Called by the usb core when a new device is connected that it thinks 612 * this driver might be interested in. 613 */ 614static int usb_pcwd_probe(struct usb_interface *interface, 615 const struct usb_device_id *id) 616{ 617 struct usb_device *udev = interface_to_usbdev(interface); 618 struct usb_host_interface *iface_desc; 619 struct usb_endpoint_descriptor *endpoint; 620 struct usb_pcwd_private *usb_pcwd = NULL; 621 int pipe, maxp; 622 int retval = -ENOMEM; 623 int got_fw_rev; 624 unsigned char fw_rev_major, fw_rev_minor; 625 char fw_ver_str[20]; 626 unsigned char option_switches, dummy; 627 628 cards_found++; 629 if (cards_found > 1) { 630 printk(KERN_ERR PFX "This driver only supports 1 device\n"); 631 return -ENODEV; 632 } 633 634 /* get the active interface descriptor */ 635 iface_desc = interface->cur_altsetting; 636 637 /* check out that we have a HID device */ 638 if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) { 639 printk(KERN_ERR PFX 640 "The device isn't a Human Interface Device\n"); 641 return -ENODEV; 642 } 643 644 /* check out the endpoint: it has to be Interrupt & IN */ 645 endpoint = &iface_desc->endpoint[0].desc; 646 647 if (!usb_endpoint_is_int_in(endpoint)) { 648 /* we didn't find a Interrupt endpoint with direction IN */ 649 printk(KERN_ERR PFX "Couldn't find an INTR & IN endpoint\n"); 650 return -ENODEV; 651 } 652 653 /* get a handle to the interrupt data pipe */ 654 pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress); 655 maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe)); 656 657 /* allocate memory for our device and initialize it */ 658 usb_pcwd = kzalloc(sizeof(struct usb_pcwd_private), GFP_KERNEL); 659 if (usb_pcwd == NULL) { 660 printk(KERN_ERR PFX "Out of memory\n"); 661 goto error; 662 } 663 664 usb_pcwd_device = usb_pcwd; 665 666 mutex_init(&usb_pcwd->mtx); 667 usb_pcwd->udev = udev; 668 usb_pcwd->interface = interface; 669 usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber; 670 usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ? 671 le16_to_cpu(endpoint->wMaxPacketSize) : 8); 672 673 /* set up the memory buffer's */ 674 usb_pcwd->intr_buffer = usb_alloc_coherent(udev, usb_pcwd->intr_size, 675 GFP_ATOMIC, &usb_pcwd->intr_dma); 676 if (!usb_pcwd->intr_buffer) { 677 printk(KERN_ERR PFX "Out of memory\n"); 678 goto error; 679 } 680 681 /* allocate the urb's */ 682 usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL); 683 if (!usb_pcwd->intr_urb) { 684 printk(KERN_ERR PFX "Out of memory\n"); 685 goto error; 686 } 687 688 /* initialise the intr urb's */ 689 usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe, 690 usb_pcwd->intr_buffer, usb_pcwd->intr_size, 691 usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval); 692 usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma; 693 usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 694 695 /* register our interrupt URB with the USB system */ 696 if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) { 697 printk(KERN_ERR PFX "Problem registering interrupt URB\n"); 698 retval = -EIO; /* failure */ 699 goto error; 700 } 701 702 /* The device exists and can be communicated with */ 703 usb_pcwd->exists = 1; 704 705 /* disable card */ 706 usb_pcwd_stop(usb_pcwd); 707 708 /* Get the Firmware Version */ 709 got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION, 710 &fw_rev_major, &fw_rev_minor); 711 if (got_fw_rev) 712 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor); 713 else 714 sprintf(fw_ver_str, "<card no answer>"); 715 716 printk(KERN_INFO PFX "Found card (Firmware: %s) with temp option\n", 717 fw_ver_str); 718 719 /* Get switch settings */ 720 usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy, 721 &option_switches); 722 723 printk(KERN_INFO PFX "Option switches (0x%02x): " 724 "Temperature Reset Enable=%s, Power On Delay=%s\n", 725 option_switches, 726 ((option_switches & 0x10) ? "ON" : "OFF"), 727 ((option_switches & 0x08) ? "ON" : "OFF")); 728 729 /* If heartbeat = 0 then we use the heartbeat from the dip-switches */ 730 if (heartbeat == 0) 731 heartbeat = heartbeat_tbl[(option_switches & 0x07)]; 732 733 /* Check that the heartbeat value is within it's range ; 734 * if not reset to the default */ 735 if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) { 736 usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT); 737 printk(KERN_INFO PFX 738 "heartbeat value must be 0<heartbeat<65536, using %d\n", 739 WATCHDOG_HEARTBEAT); 740 } 741 742 retval = register_reboot_notifier(&usb_pcwd_notifier); 743 if (retval != 0) { 744 printk(KERN_ERR PFX 745 "cannot register reboot notifier (err=%d)\n", 746 retval); 747 goto error; 748 } 749 750 retval = misc_register(&usb_pcwd_temperature_miscdev); 751 if (retval != 0) { 752 printk(KERN_ERR PFX 753 "cannot register miscdev on minor=%d (err=%d)\n", 754 TEMP_MINOR, retval); 755 goto err_out_unregister_reboot; 756 } 757 758 retval = misc_register(&usb_pcwd_miscdev); 759 if (retval != 0) { 760 printk(KERN_ERR PFX 761 "cannot register miscdev on minor=%d (err=%d)\n", 762 WATCHDOG_MINOR, retval); 763 goto err_out_misc_deregister; 764 } 765 766 /* we can register the device now, as it is ready */ 767 usb_set_intfdata(interface, usb_pcwd); 768 769 printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", 770 heartbeat, nowayout); 771 772 return 0; 773 774err_out_misc_deregister: 775 misc_deregister(&usb_pcwd_temperature_miscdev); 776err_out_unregister_reboot: 777 unregister_reboot_notifier(&usb_pcwd_notifier); 778error: 779 if (usb_pcwd) 780 usb_pcwd_delete(usb_pcwd); 781 usb_pcwd_device = NULL; 782 return retval; 783} 784 785 786/** 787 * usb_pcwd_disconnect 788 * 789 * Called by the usb core when the device is removed from the system. 790 * 791 * This routine guarantees that the driver will not submit any more urbs 792 * by clearing dev->udev. 793 */ 794static void usb_pcwd_disconnect(struct usb_interface *interface) 795{ 796 struct usb_pcwd_private *usb_pcwd; 797 798 /* prevent races with open() */ 799 mutex_lock(&disconnect_mutex); 800 801 usb_pcwd = usb_get_intfdata(interface); 802 usb_set_intfdata(interface, NULL); 803 804 mutex_lock(&usb_pcwd->mtx); 805 806 /* Stop the timer before we leave */ 807 if (!nowayout) 808 usb_pcwd_stop(usb_pcwd); 809 810 /* We should now stop communicating with the USB PCWD device */ 811 usb_pcwd->exists = 0; 812 813 /* Deregister */ 814 misc_deregister(&usb_pcwd_miscdev); 815 misc_deregister(&usb_pcwd_temperature_miscdev); 816 unregister_reboot_notifier(&usb_pcwd_notifier); 817 818 mutex_unlock(&usb_pcwd->mtx); 819 820 /* Delete the USB PCWD device */ 821 usb_pcwd_delete(usb_pcwd); 822 823 cards_found--; 824 825 mutex_unlock(&disconnect_mutex); 826 827 printk(KERN_INFO PFX "USB PC Watchdog disconnected\n"); 828} 829 830 831 832/** 833 * usb_pcwd_init 834 */ 835static int __init usb_pcwd_init(void) 836{ 837 int result; 838 839 /* register this driver with the USB subsystem */ 840 result = usb_register(&usb_pcwd_driver); 841 if (result) { 842 printk(KERN_ERR PFX "usb_register failed. Error number %d\n", 843 result); 844 return result; 845 } 846 847 printk(KERN_INFO PFX DRIVER_DESC " v" DRIVER_VERSION "\n"); 848 return 0; 849} 850 851 852/** 853 * usb_pcwd_exit 854 */ 855static void __exit usb_pcwd_exit(void) 856{ 857 /* deregister this driver with the USB subsystem */ 858 usb_deregister(&usb_pcwd_driver); 859} 860 861 862module_init(usb_pcwd_init); 863module_exit(usb_pcwd_exit); 864