pcwd_usb.c revision 089ab0791d127e8ada526c4b4d18b7584be8acf0
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@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/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...) do { if (debug) printk(KERN_DEBUG PFX format "\n" , ## arg); } while (0) 55 56 57/* Module and Version Information */ 58#define DRIVER_VERSION "1.02" 59#define DRIVER_DATE "21 Jan 2007" 60#define DRIVER_AUTHOR "Wim Van Sebroeck <wim@iguana.be>" 61#define DRIVER_DESC "Berkshire USB-PC Watchdog driver" 62#define DRIVER_LICENSE "GPL" 63#define DRIVER_NAME "pcwd_usb" 64#define PFX DRIVER_NAME ": " 65 66MODULE_AUTHOR(DRIVER_AUTHOR); 67MODULE_DESCRIPTION(DRIVER_DESC); 68MODULE_LICENSE(DRIVER_LICENSE); 69MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); 70MODULE_ALIAS_MISCDEV(TEMP_MINOR); 71 72/* Module Parameters */ 73module_param(debug, int, 0); 74MODULE_PARM_DESC(debug, "Debug enabled or not"); 75 76#define WATCHDOG_HEARTBEAT 0 /* default heartbeat = delay-time from dip-switches */ 77static int heartbeat = WATCHDOG_HEARTBEAT; 78module_param(heartbeat, int, 0); 79MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536 or 0=delay-time from dip-switches, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); 80 81static int nowayout = WATCHDOG_NOWAYOUT; 82module_param(nowayout, int, 0); 83MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); 84 85/* The vendor and product id's for the USB-PC Watchdog card */ 86#define USB_PCWD_VENDOR_ID 0x0c98 87#define USB_PCWD_PRODUCT_ID 0x1140 88 89/* table of devices that work with this driver */ 90static struct usb_device_id usb_pcwd_table [] = { 91 { USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) }, 92 { } /* Terminating entry */ 93}; 94MODULE_DEVICE_TABLE (usb, usb_pcwd_table); 95 96/* according to documentation max. time to process a command for the USB 97 * watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */ 98#define USB_COMMAND_TIMEOUT 250 99 100/* Watchdog's internal commands */ 101#define CMD_READ_TEMP 0x02 /* Read Temperature; Re-trigger Watchdog */ 102#define CMD_TRIGGER CMD_READ_TEMP 103#define CMD_GET_STATUS 0x04 /* Get Status Information */ 104#define CMD_GET_FIRMWARE_VERSION 0x08 /* Get Firmware Version */ 105#define CMD_GET_DIP_SWITCH_SETTINGS 0x0c /* Get Dip Switch Settings */ 106#define CMD_READ_WATCHDOG_TIMEOUT 0x18 /* Read Current Watchdog Time */ 107#define CMD_WRITE_WATCHDOG_TIMEOUT 0x19 /* Write Current Watchdog Time */ 108#define CMD_ENABLE_WATCHDOG 0x30 /* Enable / Disable Watchdog */ 109#define CMD_DISABLE_WATCHDOG CMD_ENABLE_WATCHDOG 110 111/* Watchdog's Dip Switch heartbeat values */ 112static const int heartbeat_tbl [] = { 113 5, /* OFF-OFF-OFF = 5 Sec */ 114 10, /* OFF-OFF-ON = 10 Sec */ 115 30, /* OFF-ON-OFF = 30 Sec */ 116 60, /* OFF-ON-ON = 1 Min */ 117 300, /* ON-OFF-OFF = 5 Min */ 118 600, /* ON-OFF-ON = 10 Min */ 119 1800, /* ON-ON-OFF = 30 Min */ 120 3600, /* ON-ON-ON = 1 hour */ 121}; 122 123/* We can only use 1 card due to the /dev/watchdog restriction */ 124static int cards_found; 125 126/* some internal variables */ 127static unsigned long is_active; 128static char expect_release; 129 130/* Structure to hold all of our device specific stuff */ 131struct usb_pcwd_private { 132 struct usb_device * udev; /* save off the usb device pointer */ 133 struct usb_interface * interface; /* the interface for this device */ 134 135 unsigned int interface_number; /* the interface number used for cmd's */ 136 137 unsigned char * intr_buffer; /* the buffer to intr data */ 138 dma_addr_t intr_dma; /* the dma address for the intr buffer */ 139 size_t intr_size; /* the size of the intr buffer */ 140 struct urb * intr_urb; /* the urb used for the intr pipe */ 141 142 unsigned char cmd_command; /* The command that is reported back */ 143 unsigned char cmd_data_msb; /* The data MSB that is reported back */ 144 unsigned char cmd_data_lsb; /* The data LSB that is reported back */ 145 atomic_t cmd_received; /* true if we received a report after a command */ 146 147 int exists; /* Wether or not the device exists */ 148 struct mutex mtx; /* locks this structure */ 149}; 150static struct usb_pcwd_private *usb_pcwd_device; 151 152/* prevent races between open() and disconnect() */ 153static DEFINE_MUTEX(disconnect_mutex); 154 155/* local function prototypes */ 156static int usb_pcwd_probe (struct usb_interface *interface, const struct usb_device_id *id); 157static void usb_pcwd_disconnect (struct usb_interface *interface); 158 159/* usb specific object needed to register this driver with the usb subsystem */ 160static struct usb_driver usb_pcwd_driver = { 161 .name = DRIVER_NAME, 162 .probe = usb_pcwd_probe, 163 .disconnect = usb_pcwd_disconnect, 164 .id_table = usb_pcwd_table, 165}; 166 167 168static void usb_pcwd_intr_done(struct urb *urb) 169{ 170 struct usb_pcwd_private *usb_pcwd = (struct usb_pcwd_private *)urb->context; 171 unsigned char *data = usb_pcwd->intr_buffer; 172 int retval; 173 174 switch (urb->status) { 175 case 0: /* success */ 176 break; 177 case -ECONNRESET: /* unlink */ 178 case -ENOENT: 179 case -ESHUTDOWN: 180 /* this urb is terminated, clean up */ 181 dbg("%s - urb shutting down with status: %d", __func__, urb->status); 182 return; 183 /* -EPIPE: should clear the halt */ 184 default: /* error */ 185 dbg("%s - nonzero urb status received: %d", __func__, urb->status); 186 goto resubmit; 187 } 188 189 dbg("received following data cmd=0x%02x msb=0x%02x lsb=0x%02x", 190 data[0], data[1], data[2]); 191 192 usb_pcwd->cmd_command = data[0]; 193 usb_pcwd->cmd_data_msb = data[1]; 194 usb_pcwd->cmd_data_lsb = data[2]; 195 196 /* notify anyone waiting that the cmd has finished */ 197 atomic_set (&usb_pcwd->cmd_received, 1); 198 199resubmit: 200 retval = usb_submit_urb (urb, GFP_ATOMIC); 201 if (retval) 202 printk(KERN_ERR PFX "can't resubmit intr, usb_submit_urb failed with result %d\n", 203 retval); 204} 205 206static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd, unsigned char cmd, 207 unsigned char *msb, unsigned char *lsb) 208{ 209 int got_response, count; 210 unsigned char buf[6]; 211 212 /* We will not send any commands if the USB PCWD device does not exist */ 213 if ((!usb_pcwd) || (!usb_pcwd->exists)) 214 return -1; 215 216 /* The USB PC Watchdog uses a 6 byte report format. The board currently uses 217 * only 3 of the six bytes of the report. */ 218 buf[0] = cmd; /* Byte 0 = CMD */ 219 buf[1] = *msb; /* Byte 1 = Data MSB */ 220 buf[2] = *lsb; /* Byte 2 = Data LSB */ 221 buf[3] = buf[4] = buf[5] = 0; /* All other bytes not used */ 222 223 dbg("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x", 224 buf[0], buf[1], buf[2]); 225 226 atomic_set (&usb_pcwd->cmd_received, 0); 227 228 if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0), 229 HID_REQ_SET_REPORT, HID_DT_REPORT, 230 0x0200, usb_pcwd->interface_number, buf, sizeof(buf), 231 USB_COMMAND_TIMEOUT) != sizeof(buf)) { 232 dbg("usb_pcwd_send_command: error in usb_control_msg for cmd 0x%x 0x%x 0x%x\n", cmd, *msb, *lsb); 233 } 234 /* wait till the usb card processed the command, 235 * with a max. timeout of USB_COMMAND_TIMEOUT */ 236 got_response = 0; 237 for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response); count++) { 238 mdelay(1); 239 if (atomic_read (&usb_pcwd->cmd_received)) 240 got_response = 1; 241 } 242 243 if ((got_response) && (cmd == usb_pcwd->cmd_command)) { 244 /* read back response */ 245 *msb = usb_pcwd->cmd_data_msb; 246 *lsb = usb_pcwd->cmd_data_lsb; 247 } 248 249 return got_response; 250} 251 252static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd) 253{ 254 unsigned char msb = 0x00; 255 unsigned char lsb = 0x00; 256 int retval; 257 258 /* Enable Watchdog */ 259 retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG, &msb, &lsb); 260 261 if ((retval == 0) || (lsb == 0)) { 262 printk(KERN_ERR PFX "Card did not acknowledge enable attempt\n"); 263 return -1; 264 } 265 266 return 0; 267} 268 269static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd) 270{ 271 unsigned char msb = 0xA5; 272 unsigned char lsb = 0xC3; 273 int retval; 274 275 /* Disable Watchdog */ 276 retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG, &msb, &lsb); 277 278 if ((retval == 0) || (lsb != 0)) { 279 printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n"); 280 return -1; 281 } 282 283 return 0; 284} 285 286static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd) 287{ 288 unsigned char dummy; 289 290 /* Re-trigger Watchdog */ 291 usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy); 292 293 return 0; 294} 295 296static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t) 297{ 298 unsigned char msb = t / 256; 299 unsigned char lsb = t % 256; 300 301 if ((t < 0x0001) || (t > 0xFFFF)) 302 return -EINVAL; 303 304 /* Write new heartbeat to watchdog */ 305 usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb); 306 307 heartbeat = t; 308 return 0; 309} 310 311static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd, int *temperature) 312{ 313 unsigned char msb, lsb; 314 315 usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb); 316 317 /* 318 * Convert celsius to fahrenheit, since this was 319 * the decided 'standard' for this return value. 320 */ 321 *temperature = (lsb * 9 / 5) + 32; 322 323 return 0; 324} 325 326static int usb_pcwd_get_timeleft(struct usb_pcwd_private *usb_pcwd, int *time_left) 327{ 328 unsigned char msb, lsb; 329 330 /* Read the time that's left before rebooting */ 331 /* Note: if the board is not yet armed then we will read 0xFFFF */ 332 usb_pcwd_send_command(usb_pcwd, CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb); 333 334 *time_left = (msb << 8) + lsb; 335 336 return 0; 337} 338 339/* 340 * /dev/watchdog handling 341 */ 342 343static ssize_t usb_pcwd_write(struct file *file, const char __user *data, 344 size_t len, loff_t *ppos) 345{ 346 /* See if we got the magic character 'V' and reload the timer */ 347 if (len) { 348 if (!nowayout) { 349 size_t i; 350 351 /* note: just in case someone wrote the magic character 352 * five months ago... */ 353 expect_release = 0; 354 355 /* scan to see whether or not we got the magic character */ 356 for (i = 0; i != len; i++) { 357 char c; 358 if(get_user(c, data+i)) 359 return -EFAULT; 360 if (c == 'V') 361 expect_release = 42; 362 } 363 } 364 365 /* someone wrote to us, we should reload the timer */ 366 usb_pcwd_keepalive(usb_pcwd_device); 367 } 368 return len; 369} 370 371static int usb_pcwd_ioctl(struct inode *inode, struct file *file, 372 unsigned int cmd, unsigned long arg) 373{ 374 void __user *argp = (void __user *)arg; 375 int __user *p = argp; 376 static struct watchdog_info ident = { 377 .options = WDIOF_KEEPALIVEPING | 378 WDIOF_SETTIMEOUT | 379 WDIOF_MAGICCLOSE, 380 .firmware_version = 1, 381 .identity = DRIVER_NAME, 382 }; 383 384 switch (cmd) { 385 case WDIOC_GETSUPPORT: 386 return copy_to_user(argp, &ident, 387 sizeof (ident)) ? -EFAULT : 0; 388 389 case WDIOC_GETSTATUS: 390 case WDIOC_GETBOOTSTATUS: 391 return put_user(0, p); 392 393 case WDIOC_GETTEMP: 394 { 395 int temperature; 396 397 if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature)) 398 return -EFAULT; 399 400 return put_user(temperature, p); 401 } 402 403 case WDIOC_KEEPALIVE: 404 usb_pcwd_keepalive(usb_pcwd_device); 405 return 0; 406 407 case WDIOC_SETOPTIONS: 408 { 409 int new_options, retval = -EINVAL; 410 411 if (get_user (new_options, p)) 412 return -EFAULT; 413 414 if (new_options & WDIOS_DISABLECARD) { 415 usb_pcwd_stop(usb_pcwd_device); 416 retval = 0; 417 } 418 419 if (new_options & WDIOS_ENABLECARD) { 420 usb_pcwd_start(usb_pcwd_device); 421 retval = 0; 422 } 423 424 return retval; 425 } 426 427 case WDIOC_SETTIMEOUT: 428 { 429 int new_heartbeat; 430 431 if (get_user(new_heartbeat, p)) 432 return -EFAULT; 433 434 if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat)) 435 return -EINVAL; 436 437 usb_pcwd_keepalive(usb_pcwd_device); 438 /* Fall */ 439 } 440 441 case WDIOC_GETTIMEOUT: 442 return put_user(heartbeat, p); 443 444 case WDIOC_GETTIMELEFT: 445 { 446 int time_left; 447 448 if (usb_pcwd_get_timeleft(usb_pcwd_device, &time_left)) 449 return -EFAULT; 450 451 return put_user(time_left, p); 452 } 453 454 default: 455 return -ENOTTY; 456 } 457} 458 459static int usb_pcwd_open(struct inode *inode, struct file *file) 460{ 461 /* /dev/watchdog can only be opened once */ 462 if (test_and_set_bit(0, &is_active)) 463 return -EBUSY; 464 465 /* Activate */ 466 usb_pcwd_start(usb_pcwd_device); 467 usb_pcwd_keepalive(usb_pcwd_device); 468 return nonseekable_open(inode, file); 469} 470 471static int usb_pcwd_release(struct inode *inode, struct file *file) 472{ 473 /* 474 * Shut off the timer. 475 */ 476 if (expect_release == 42) { 477 usb_pcwd_stop(usb_pcwd_device); 478 } else { 479 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); 480 usb_pcwd_keepalive(usb_pcwd_device); 481 } 482 expect_release = 0; 483 clear_bit(0, &is_active); 484 return 0; 485} 486 487/* 488 * /dev/temperature handling 489 */ 490 491static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data, 492 size_t len, loff_t *ppos) 493{ 494 int temperature; 495 496 if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature)) 497 return -EFAULT; 498 499 if (copy_to_user(data, &temperature, 1)) 500 return -EFAULT; 501 502 return 1; 503} 504 505static int usb_pcwd_temperature_open(struct inode *inode, struct file *file) 506{ 507 return nonseekable_open(inode, file); 508} 509 510static int usb_pcwd_temperature_release(struct inode *inode, struct file *file) 511{ 512 return 0; 513} 514 515/* 516 * Notify system 517 */ 518 519static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused) 520{ 521 if (code==SYS_DOWN || code==SYS_HALT) { 522 /* Turn the WDT off */ 523 usb_pcwd_stop(usb_pcwd_device); 524 } 525 526 return NOTIFY_DONE; 527} 528 529/* 530 * Kernel Interfaces 531 */ 532 533static const struct file_operations usb_pcwd_fops = { 534 .owner = THIS_MODULE, 535 .llseek = no_llseek, 536 .write = usb_pcwd_write, 537 .ioctl = usb_pcwd_ioctl, 538 .open = usb_pcwd_open, 539 .release = usb_pcwd_release, 540}; 541 542static struct miscdevice usb_pcwd_miscdev = { 543 .minor = WATCHDOG_MINOR, 544 .name = "watchdog", 545 .fops = &usb_pcwd_fops, 546}; 547 548static const struct file_operations usb_pcwd_temperature_fops = { 549 .owner = THIS_MODULE, 550 .llseek = no_llseek, 551 .read = usb_pcwd_temperature_read, 552 .open = usb_pcwd_temperature_open, 553 .release = usb_pcwd_temperature_release, 554}; 555 556static struct miscdevice usb_pcwd_temperature_miscdev = { 557 .minor = TEMP_MINOR, 558 .name = "temperature", 559 .fops = &usb_pcwd_temperature_fops, 560}; 561 562static struct notifier_block usb_pcwd_notifier = { 563 .notifier_call = usb_pcwd_notify_sys, 564}; 565 566/** 567 * usb_pcwd_delete 568 */ 569static inline void usb_pcwd_delete (struct usb_pcwd_private *usb_pcwd) 570{ 571 usb_free_urb(usb_pcwd->intr_urb); 572 if (usb_pcwd->intr_buffer != NULL) 573 usb_buffer_free(usb_pcwd->udev, usb_pcwd->intr_size, 574 usb_pcwd->intr_buffer, usb_pcwd->intr_dma); 575 kfree (usb_pcwd); 576} 577 578/** 579 * usb_pcwd_probe 580 * 581 * Called by the usb core when a new device is connected that it thinks 582 * this driver might be interested in. 583 */ 584static int usb_pcwd_probe(struct usb_interface *interface, const struct usb_device_id *id) 585{ 586 struct usb_device *udev = interface_to_usbdev(interface); 587 struct usb_host_interface *iface_desc; 588 struct usb_endpoint_descriptor *endpoint; 589 struct usb_pcwd_private *usb_pcwd = NULL; 590 int pipe, maxp; 591 int retval = -ENOMEM; 592 int got_fw_rev; 593 unsigned char fw_rev_major, fw_rev_minor; 594 char fw_ver_str[20]; 595 unsigned char option_switches, dummy; 596 597 cards_found++; 598 if (cards_found > 1) { 599 printk(KERN_ERR PFX "This driver only supports 1 device\n"); 600 return -ENODEV; 601 } 602 603 /* get the active interface descriptor */ 604 iface_desc = interface->cur_altsetting; 605 606 /* check out that we have a HID device */ 607 if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) { 608 printk(KERN_ERR PFX "The device isn't a Human Interface Device\n"); 609 return -ENODEV; 610 } 611 612 /* check out the endpoint: it has to be Interrupt & IN */ 613 endpoint = &iface_desc->endpoint[0].desc; 614 615 if (!((endpoint->bEndpointAddress & USB_DIR_IN) && 616 ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) 617 == USB_ENDPOINT_XFER_INT))) { 618 /* we didn't find a Interrupt endpoint with direction IN */ 619 printk(KERN_ERR PFX "Couldn't find an INTR & IN endpoint\n"); 620 return -ENODEV; 621 } 622 623 /* get a handle to the interrupt data pipe */ 624 pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress); 625 maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe)); 626 627 /* allocate memory for our device and initialize it */ 628 usb_pcwd = kzalloc (sizeof(struct usb_pcwd_private), GFP_KERNEL); 629 if (usb_pcwd == NULL) { 630 printk(KERN_ERR PFX "Out of memory\n"); 631 goto error; 632 } 633 634 usb_pcwd_device = usb_pcwd; 635 636 mutex_init(&usb_pcwd->mtx); 637 usb_pcwd->udev = udev; 638 usb_pcwd->interface = interface; 639 usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber; 640 usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ? le16_to_cpu(endpoint->wMaxPacketSize) : 8); 641 642 /* set up the memory buffer's */ 643 if (!(usb_pcwd->intr_buffer = usb_buffer_alloc(udev, usb_pcwd->intr_size, GFP_ATOMIC, &usb_pcwd->intr_dma))) { 644 printk(KERN_ERR PFX "Out of memory\n"); 645 goto error; 646 } 647 648 /* allocate the urb's */ 649 usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL); 650 if (!usb_pcwd->intr_urb) { 651 printk(KERN_ERR PFX "Out of memory\n"); 652 goto error; 653 } 654 655 /* initialise the intr urb's */ 656 usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe, 657 usb_pcwd->intr_buffer, usb_pcwd->intr_size, 658 usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval); 659 usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma; 660 usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 661 662 /* register our interrupt URB with the USB system */ 663 if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) { 664 printk(KERN_ERR PFX "Problem registering interrupt URB\n"); 665 retval = -EIO; /* failure */ 666 goto error; 667 } 668 669 /* The device exists and can be communicated with */ 670 usb_pcwd->exists = 1; 671 672 /* disable card */ 673 usb_pcwd_stop(usb_pcwd); 674 675 /* Get the Firmware Version */ 676 got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor); 677 if (got_fw_rev) { 678 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor); 679 } else { 680 sprintf(fw_ver_str, "<card no answer>"); 681 } 682 683 printk(KERN_INFO PFX "Found card (Firmware: %s) with temp option\n", 684 fw_ver_str); 685 686 /* Get switch settings */ 687 usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy, &option_switches); 688 689 printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n", 690 option_switches, 691 ((option_switches & 0x10) ? "ON" : "OFF"), 692 ((option_switches & 0x08) ? "ON" : "OFF")); 693 694 /* If heartbeat = 0 then we use the heartbeat from the dip-switches */ 695 if (heartbeat == 0) 696 heartbeat = heartbeat_tbl[(option_switches & 0x07)]; 697 698 /* Check that the heartbeat value is within it's range ; if not reset to the default */ 699 if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) { 700 usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT); 701 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n", 702 WATCHDOG_HEARTBEAT); 703 } 704 705 retval = register_reboot_notifier(&usb_pcwd_notifier); 706 if (retval != 0) { 707 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", 708 retval); 709 goto error; 710 } 711 712 retval = misc_register(&usb_pcwd_temperature_miscdev); 713 if (retval != 0) { 714 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", 715 TEMP_MINOR, retval); 716 goto err_out_unregister_reboot; 717 } 718 719 retval = misc_register(&usb_pcwd_miscdev); 720 if (retval != 0) { 721 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", 722 WATCHDOG_MINOR, retval); 723 goto err_out_misc_deregister; 724 } 725 726 /* we can register the device now, as it is ready */ 727 usb_set_intfdata (interface, usb_pcwd); 728 729 printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", 730 heartbeat, nowayout); 731 732 return 0; 733 734err_out_misc_deregister: 735 misc_deregister(&usb_pcwd_temperature_miscdev); 736err_out_unregister_reboot: 737 unregister_reboot_notifier(&usb_pcwd_notifier); 738error: 739 if (usb_pcwd) 740 usb_pcwd_delete(usb_pcwd); 741 usb_pcwd_device = NULL; 742 return retval; 743} 744 745 746/** 747 * usb_pcwd_disconnect 748 * 749 * Called by the usb core when the device is removed from the system. 750 * 751 * This routine guarantees that the driver will not submit any more urbs 752 * by clearing dev->udev. 753 */ 754static void usb_pcwd_disconnect(struct usb_interface *interface) 755{ 756 struct usb_pcwd_private *usb_pcwd; 757 758 /* prevent races with open() */ 759 mutex_lock(&disconnect_mutex); 760 761 usb_pcwd = usb_get_intfdata (interface); 762 usb_set_intfdata (interface, NULL); 763 764 mutex_lock(&usb_pcwd->mtx); 765 766 /* Stop the timer before we leave */ 767 if (!nowayout) 768 usb_pcwd_stop(usb_pcwd); 769 770 /* We should now stop communicating with the USB PCWD device */ 771 usb_pcwd->exists = 0; 772 773 /* Deregister */ 774 misc_deregister(&usb_pcwd_miscdev); 775 misc_deregister(&usb_pcwd_temperature_miscdev); 776 unregister_reboot_notifier(&usb_pcwd_notifier); 777 778 mutex_unlock(&usb_pcwd->mtx); 779 780 /* Delete the USB PCWD device */ 781 usb_pcwd_delete(usb_pcwd); 782 783 cards_found--; 784 785 mutex_unlock(&disconnect_mutex); 786 787 printk(KERN_INFO PFX "USB PC Watchdog disconnected\n"); 788} 789 790 791 792/** 793 * usb_pcwd_init 794 */ 795static int __init usb_pcwd_init(void) 796{ 797 int result; 798 799 /* register this driver with the USB subsystem */ 800 result = usb_register(&usb_pcwd_driver); 801 if (result) { 802 printk(KERN_ERR PFX "usb_register failed. Error number %d\n", 803 result); 804 return result; 805 } 806 807 printk(KERN_INFO PFX DRIVER_DESC " v" DRIVER_VERSION " (" DRIVER_DATE ")\n"); 808 return 0; 809} 810 811 812/** 813 * usb_pcwd_exit 814 */ 815static void __exit usb_pcwd_exit(void) 816{ 817 /* deregister this driver with the USB subsystem */ 818 usb_deregister(&usb_pcwd_driver); 819} 820 821 822module_init (usb_pcwd_init); 823module_exit (usb_pcwd_exit); 824