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