pcwd_usb.c revision fa9363c5f866d6beedf36d4f4b1393ba802d8248
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 44#include <asm/uaccess.h> /* For copy_to_user/put_user/... */ 45 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#undef dbg 55#define dbg(format, arg...) do { if (debug) printk(KERN_DEBUG PFX format "\n" , ## arg); } while (0) 56 57 58/* Module and Version Information */ 59#define DRIVER_VERSION "1.02" 60#define DRIVER_DATE "21 Jan 2007" 61#define DRIVER_AUTHOR "Wim Van Sebroeck <wim@iguana.be>" 62#define DRIVER_DESC "Berkshire USB-PC Watchdog driver" 63#define DRIVER_LICENSE "GPL" 64#define DRIVER_NAME "pcwd_usb" 65#define PFX DRIVER_NAME ": " 66 67MODULE_AUTHOR(DRIVER_AUTHOR); 68MODULE_DESCRIPTION(DRIVER_DESC); 69MODULE_LICENSE(DRIVER_LICENSE); 70MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); 71MODULE_ALIAS_MISCDEV(TEMP_MINOR); 72 73/* Module Parameters */ 74module_param(debug, int, 0); 75MODULE_PARM_DESC(debug, "Debug enabled or not"); 76 77#define WATCHDOG_HEARTBEAT 0 /* default heartbeat = delay-time from dip-switches */ 78static int heartbeat = WATCHDOG_HEARTBEAT; 79module_param(heartbeat, int, 0); 80MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536 or 0=delay-time from dip-switches, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); 81 82static int nowayout = WATCHDOG_NOWAYOUT; 83module_param(nowayout, int, 0); 84MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); 85 86/* The vendor and product id's for the USB-PC Watchdog card */ 87#define USB_PCWD_VENDOR_ID 0x0c98 88#define USB_PCWD_PRODUCT_ID 0x1140 89 90/* table of devices that work with this driver */ 91static struct usb_device_id usb_pcwd_table [] = { 92 { USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) }, 93 { } /* Terminating entry */ 94}; 95MODULE_DEVICE_TABLE (usb, usb_pcwd_table); 96 97/* according to documentation max. time to process a command for the USB 98 * watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */ 99#define USB_COMMAND_TIMEOUT 250 100 101/* Watchdog's internal commands */ 102#define CMD_READ_TEMP 0x02 /* Read Temperature; Re-trigger Watchdog */ 103#define CMD_TRIGGER CMD_READ_TEMP 104#define CMD_GET_STATUS 0x04 /* Get Status Information */ 105#define CMD_GET_FIRMWARE_VERSION 0x08 /* Get Firmware Version */ 106#define CMD_GET_DIP_SWITCH_SETTINGS 0x0c /* Get Dip Switch Settings */ 107#define CMD_READ_WATCHDOG_TIMEOUT 0x18 /* Read Current Watchdog Time */ 108#define CMD_WRITE_WATCHDOG_TIMEOUT 0x19 /* Write Current Watchdog Time */ 109#define CMD_ENABLE_WATCHDOG 0x30 /* Enable / Disable Watchdog */ 110#define CMD_DISABLE_WATCHDOG CMD_ENABLE_WATCHDOG 111 112/* Watchdog's Dip Switch heartbeat values */ 113static const int heartbeat_tbl [] = { 114 5, /* OFF-OFF-OFF = 5 Sec */ 115 10, /* OFF-OFF-ON = 10 Sec */ 116 30, /* OFF-ON-OFF = 30 Sec */ 117 60, /* OFF-ON-ON = 1 Min */ 118 300, /* ON-OFF-OFF = 5 Min */ 119 600, /* ON-OFF-ON = 10 Min */ 120 1800, /* ON-ON-OFF = 30 Min */ 121 3600, /* ON-ON-ON = 1 hour */ 122}; 123 124/* We can only use 1 card due to the /dev/watchdog restriction */ 125static int cards_found; 126 127/* some internal variables */ 128static unsigned long is_active; 129static char expect_release; 130 131/* Structure to hold all of our device specific stuff */ 132struct usb_pcwd_private { 133 struct usb_device * udev; /* save off the usb device pointer */ 134 struct usb_interface * interface; /* the interface for this device */ 135 136 unsigned int interface_number; /* the interface number used for cmd's */ 137 138 unsigned char * intr_buffer; /* the buffer to intr data */ 139 dma_addr_t intr_dma; /* the dma address for the intr buffer */ 140 size_t intr_size; /* the size of the intr buffer */ 141 struct urb * intr_urb; /* the urb used for the intr pipe */ 142 143 unsigned char cmd_command; /* The command that is reported back */ 144 unsigned char cmd_data_msb; /* The data MSB that is reported back */ 145 unsigned char cmd_data_lsb; /* The data LSB that is reported back */ 146 atomic_t cmd_received; /* true if we received a report after a command */ 147 148 int exists; /* Wether or not the device exists */ 149 struct mutex mtx; /* locks this structure */ 150}; 151static struct usb_pcwd_private *usb_pcwd_device; 152 153/* prevent races between open() and disconnect() */ 154static DEFINE_MUTEX(disconnect_mutex); 155 156/* local function prototypes */ 157static int usb_pcwd_probe (struct usb_interface *interface, const struct usb_device_id *id); 158static void usb_pcwd_disconnect (struct usb_interface *interface); 159 160/* usb specific object needed to register this driver with the usb subsystem */ 161static struct usb_driver usb_pcwd_driver = { 162 .name = DRIVER_NAME, 163 .probe = usb_pcwd_probe, 164 .disconnect = usb_pcwd_disconnect, 165 .id_table = usb_pcwd_table, 166}; 167 168 169static void usb_pcwd_intr_done(struct urb *urb) 170{ 171 struct usb_pcwd_private *usb_pcwd = (struct usb_pcwd_private *)urb->context; 172 unsigned char *data = usb_pcwd->intr_buffer; 173 int retval; 174 175 switch (urb->status) { 176 case 0: /* success */ 177 break; 178 case -ECONNRESET: /* unlink */ 179 case -ENOENT: 180 case -ESHUTDOWN: 181 /* this urb is terminated, clean up */ 182 dbg("%s - urb shutting down with status: %d", __func__, urb->status); 183 return; 184 /* -EPIPE: should clear the halt */ 185 default: /* error */ 186 dbg("%s - nonzero urb status received: %d", __func__, urb->status); 187 goto resubmit; 188 } 189 190 dbg("received following data cmd=0x%02x msb=0x%02x lsb=0x%02x", 191 data[0], data[1], data[2]); 192 193 usb_pcwd->cmd_command = data[0]; 194 usb_pcwd->cmd_data_msb = data[1]; 195 usb_pcwd->cmd_data_lsb = data[2]; 196 197 /* notify anyone waiting that the cmd has finished */ 198 atomic_set (&usb_pcwd->cmd_received, 1); 199 200resubmit: 201 retval = usb_submit_urb (urb, GFP_ATOMIC); 202 if (retval) 203 printk(KERN_ERR PFX "can't resubmit intr, usb_submit_urb failed with result %d\n", 204 retval); 205} 206 207static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd, unsigned char cmd, 208 unsigned char *msb, unsigned char *lsb) 209{ 210 int got_response, count; 211 unsigned char buf[6]; 212 213 /* We will not send any commands if the USB PCWD device does not exist */ 214 if ((!usb_pcwd) || (!usb_pcwd->exists)) 215 return -1; 216 217 /* The USB PC Watchdog uses a 6 byte report format. The board currently uses 218 * only 3 of the six bytes of the report. */ 219 buf[0] = cmd; /* Byte 0 = CMD */ 220 buf[1] = *msb; /* Byte 1 = Data MSB */ 221 buf[2] = *lsb; /* Byte 2 = Data LSB */ 222 buf[3] = buf[4] = buf[5] = 0; /* All other bytes not used */ 223 224 dbg("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x", 225 buf[0], buf[1], buf[2]); 226 227 atomic_set (&usb_pcwd->cmd_received, 0); 228 229 if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0), 230 HID_REQ_SET_REPORT, HID_DT_REPORT, 231 0x0200, usb_pcwd->interface_number, buf, sizeof(buf), 232 USB_COMMAND_TIMEOUT) != sizeof(buf)) { 233 dbg("usb_pcwd_send_command: error in usb_control_msg for cmd 0x%x 0x%x 0x%x\n", cmd, *msb, *lsb); 234 } 235 /* wait till the usb card processed the command, 236 * with a max. timeout of USB_COMMAND_TIMEOUT */ 237 got_response = 0; 238 for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response); count++) { 239 mdelay(1); 240 if (atomic_read (&usb_pcwd->cmd_received)) 241 got_response = 1; 242 } 243 244 if ((got_response) && (cmd == usb_pcwd->cmd_command)) { 245 /* read back response */ 246 *msb = usb_pcwd->cmd_data_msb; 247 *lsb = usb_pcwd->cmd_data_lsb; 248 } 249 250 return got_response; 251} 252 253static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd) 254{ 255 unsigned char msb = 0x00; 256 unsigned char lsb = 0x00; 257 int retval; 258 259 /* Enable Watchdog */ 260 retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG, &msb, &lsb); 261 262 if ((retval == 0) || (lsb == 0)) { 263 printk(KERN_ERR PFX "Card did not acknowledge enable attempt\n"); 264 return -1; 265 } 266 267 return 0; 268} 269 270static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd) 271{ 272 unsigned char msb = 0xA5; 273 unsigned char lsb = 0xC3; 274 int retval; 275 276 /* Disable Watchdog */ 277 retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG, &msb, &lsb); 278 279 if ((retval == 0) || (lsb != 0)) { 280 printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n"); 281 return -1; 282 } 283 284 return 0; 285} 286 287static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd) 288{ 289 unsigned char dummy; 290 291 /* Re-trigger Watchdog */ 292 usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy); 293 294 return 0; 295} 296 297static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t) 298{ 299 unsigned char msb = t / 256; 300 unsigned char lsb = t % 256; 301 302 if ((t < 0x0001) || (t > 0xFFFF)) 303 return -EINVAL; 304 305 /* Write new heartbeat to watchdog */ 306 usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb); 307 308 heartbeat = t; 309 return 0; 310} 311 312static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd, int *temperature) 313{ 314 unsigned char msb, lsb; 315 316 usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb); 317 318 /* 319 * Convert celsius to fahrenheit, since this was 320 * the decided 'standard' for this return value. 321 */ 322 *temperature = (lsb * 9 / 5) + 32; 323 324 return 0; 325} 326 327static int usb_pcwd_get_timeleft(struct usb_pcwd_private *usb_pcwd, int *time_left) 328{ 329 unsigned char msb, lsb; 330 331 /* Read the time that's left before rebooting */ 332 /* Note: if the board is not yet armed then we will read 0xFFFF */ 333 usb_pcwd_send_command(usb_pcwd, CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb); 334 335 *time_left = (msb << 8) + lsb; 336 337 return 0; 338} 339 340/* 341 * /dev/watchdog handling 342 */ 343 344static ssize_t usb_pcwd_write(struct file *file, const char __user *data, 345 size_t len, loff_t *ppos) 346{ 347 /* See if we got the magic character 'V' and reload the timer */ 348 if (len) { 349 if (!nowayout) { 350 size_t i; 351 352 /* note: just in case someone wrote the magic character 353 * five months ago... */ 354 expect_release = 0; 355 356 /* scan to see whether or not we got the magic character */ 357 for (i = 0; i != len; i++) { 358 char c; 359 if(get_user(c, data+i)) 360 return -EFAULT; 361 if (c == 'V') 362 expect_release = 42; 363 } 364 } 365 366 /* someone wrote to us, we should reload the timer */ 367 usb_pcwd_keepalive(usb_pcwd_device); 368 } 369 return len; 370} 371 372static int usb_pcwd_ioctl(struct inode *inode, struct file *file, 373 unsigned int cmd, unsigned long arg) 374{ 375 void __user *argp = (void __user *)arg; 376 int __user *p = argp; 377 static struct watchdog_info ident = { 378 .options = WDIOF_KEEPALIVEPING | 379 WDIOF_SETTIMEOUT | 380 WDIOF_MAGICCLOSE, 381 .firmware_version = 1, 382 .identity = DRIVER_NAME, 383 }; 384 385 switch (cmd) { 386 case WDIOC_GETSUPPORT: 387 return copy_to_user(argp, &ident, 388 sizeof (ident)) ? -EFAULT : 0; 389 390 case WDIOC_GETSTATUS: 391 case WDIOC_GETBOOTSTATUS: 392 return put_user(0, p); 393 394 case WDIOC_GETTEMP: 395 { 396 int temperature; 397 398 if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature)) 399 return -EFAULT; 400 401 return put_user(temperature, p); 402 } 403 404 case WDIOC_KEEPALIVE: 405 usb_pcwd_keepalive(usb_pcwd_device); 406 return 0; 407 408 case WDIOC_SETOPTIONS: 409 { 410 int new_options, retval = -EINVAL; 411 412 if (get_user (new_options, p)) 413 return -EFAULT; 414 415 if (new_options & WDIOS_DISABLECARD) { 416 usb_pcwd_stop(usb_pcwd_device); 417 retval = 0; 418 } 419 420 if (new_options & WDIOS_ENABLECARD) { 421 usb_pcwd_start(usb_pcwd_device); 422 retval = 0; 423 } 424 425 return retval; 426 } 427 428 case WDIOC_SETTIMEOUT: 429 { 430 int new_heartbeat; 431 432 if (get_user(new_heartbeat, p)) 433 return -EFAULT; 434 435 if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat)) 436 return -EINVAL; 437 438 usb_pcwd_keepalive(usb_pcwd_device); 439 /* Fall */ 440 } 441 442 case WDIOC_GETTIMEOUT: 443 return put_user(heartbeat, p); 444 445 case WDIOC_GETTIMELEFT: 446 { 447 int time_left; 448 449 if (usb_pcwd_get_timeleft(usb_pcwd_device, &time_left)) 450 return -EFAULT; 451 452 return put_user(time_left, p); 453 } 454 455 default: 456 return -ENOTTY; 457 } 458} 459 460static int usb_pcwd_open(struct inode *inode, struct file *file) 461{ 462 /* /dev/watchdog can only be opened once */ 463 if (test_and_set_bit(0, &is_active)) 464 return -EBUSY; 465 466 /* Activate */ 467 usb_pcwd_start(usb_pcwd_device); 468 usb_pcwd_keepalive(usb_pcwd_device); 469 return nonseekable_open(inode, file); 470} 471 472static int usb_pcwd_release(struct inode *inode, struct file *file) 473{ 474 /* 475 * Shut off the timer. 476 */ 477 if (expect_release == 42) { 478 usb_pcwd_stop(usb_pcwd_device); 479 } else { 480 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); 481 usb_pcwd_keepalive(usb_pcwd_device); 482 } 483 expect_release = 0; 484 clear_bit(0, &is_active); 485 return 0; 486} 487 488/* 489 * /dev/temperature handling 490 */ 491 492static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data, 493 size_t len, loff_t *ppos) 494{ 495 int temperature; 496 497 if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature)) 498 return -EFAULT; 499 500 if (copy_to_user(data, &temperature, 1)) 501 return -EFAULT; 502 503 return 1; 504} 505 506static int usb_pcwd_temperature_open(struct inode *inode, struct file *file) 507{ 508 return nonseekable_open(inode, file); 509} 510 511static int usb_pcwd_temperature_release(struct inode *inode, struct file *file) 512{ 513 return 0; 514} 515 516/* 517 * Notify system 518 */ 519 520static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused) 521{ 522 if (code==SYS_DOWN || code==SYS_HALT) { 523 /* Turn the WDT off */ 524 usb_pcwd_stop(usb_pcwd_device); 525 } 526 527 return NOTIFY_DONE; 528} 529 530/* 531 * Kernel Interfaces 532 */ 533 534static const struct file_operations usb_pcwd_fops = { 535 .owner = THIS_MODULE, 536 .llseek = no_llseek, 537 .write = usb_pcwd_write, 538 .ioctl = usb_pcwd_ioctl, 539 .open = usb_pcwd_open, 540 .release = usb_pcwd_release, 541}; 542 543static struct miscdevice usb_pcwd_miscdev = { 544 .minor = WATCHDOG_MINOR, 545 .name = "watchdog", 546 .fops = &usb_pcwd_fops, 547}; 548 549static const struct file_operations usb_pcwd_temperature_fops = { 550 .owner = THIS_MODULE, 551 .llseek = no_llseek, 552 .read = usb_pcwd_temperature_read, 553 .open = usb_pcwd_temperature_open, 554 .release = usb_pcwd_temperature_release, 555}; 556 557static struct miscdevice usb_pcwd_temperature_miscdev = { 558 .minor = TEMP_MINOR, 559 .name = "temperature", 560 .fops = &usb_pcwd_temperature_fops, 561}; 562 563static struct notifier_block usb_pcwd_notifier = { 564 .notifier_call = usb_pcwd_notify_sys, 565}; 566 567/** 568 * usb_pcwd_delete 569 */ 570static inline void usb_pcwd_delete (struct usb_pcwd_private *usb_pcwd) 571{ 572 usb_free_urb(usb_pcwd->intr_urb); 573 if (usb_pcwd->intr_buffer != NULL) 574 usb_buffer_free(usb_pcwd->udev, usb_pcwd->intr_size, 575 usb_pcwd->intr_buffer, usb_pcwd->intr_dma); 576 kfree (usb_pcwd); 577} 578 579/** 580 * usb_pcwd_probe 581 * 582 * Called by the usb core when a new device is connected that it thinks 583 * this driver might be interested in. 584 */ 585static int usb_pcwd_probe(struct usb_interface *interface, const struct usb_device_id *id) 586{ 587 struct usb_device *udev = interface_to_usbdev(interface); 588 struct usb_host_interface *iface_desc; 589 struct usb_endpoint_descriptor *endpoint; 590 struct usb_pcwd_private *usb_pcwd = NULL; 591 int pipe, maxp; 592 int retval = -ENOMEM; 593 int got_fw_rev; 594 unsigned char fw_rev_major, fw_rev_minor; 595 char fw_ver_str[20]; 596 unsigned char option_switches, dummy; 597 598 cards_found++; 599 if (cards_found > 1) { 600 printk(KERN_ERR PFX "This driver only supports 1 device\n"); 601 return -ENODEV; 602 } 603 604 /* get the active interface descriptor */ 605 iface_desc = interface->cur_altsetting; 606 607 /* check out that we have a HID device */ 608 if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) { 609 printk(KERN_ERR PFX "The device isn't a Human Interface Device\n"); 610 return -ENODEV; 611 } 612 613 /* check out the endpoint: it has to be Interrupt & IN */ 614 endpoint = &iface_desc->endpoint[0].desc; 615 616 if (!((endpoint->bEndpointAddress & USB_DIR_IN) && 617 ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) 618 == USB_ENDPOINT_XFER_INT))) { 619 /* we didn't find a Interrupt endpoint with direction IN */ 620 printk(KERN_ERR PFX "Couldn't find an INTR & IN endpoint\n"); 621 return -ENODEV; 622 } 623 624 /* get a handle to the interrupt data pipe */ 625 pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress); 626 maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe)); 627 628 /* allocate memory for our device and initialize it */ 629 usb_pcwd = kzalloc (sizeof(struct usb_pcwd_private), GFP_KERNEL); 630 if (usb_pcwd == NULL) { 631 printk(KERN_ERR PFX "Out of memory\n"); 632 goto error; 633 } 634 635 usb_pcwd_device = usb_pcwd; 636 637 mutex_init(&usb_pcwd->mtx); 638 usb_pcwd->udev = udev; 639 usb_pcwd->interface = interface; 640 usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber; 641 usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ? le16_to_cpu(endpoint->wMaxPacketSize) : 8); 642 643 /* set up the memory buffer's */ 644 if (!(usb_pcwd->intr_buffer = usb_buffer_alloc(udev, usb_pcwd->intr_size, GFP_ATOMIC, &usb_pcwd->intr_dma))) { 645 printk(KERN_ERR PFX "Out of memory\n"); 646 goto error; 647 } 648 649 /* allocate the urb's */ 650 usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL); 651 if (!usb_pcwd->intr_urb) { 652 printk(KERN_ERR PFX "Out of memory\n"); 653 goto error; 654 } 655 656 /* initialise the intr urb's */ 657 usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe, 658 usb_pcwd->intr_buffer, usb_pcwd->intr_size, 659 usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval); 660 usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma; 661 usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 662 663 /* register our interrupt URB with the USB system */ 664 if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) { 665 printk(KERN_ERR PFX "Problem registering interrupt URB\n"); 666 retval = -EIO; /* failure */ 667 goto error; 668 } 669 670 /* The device exists and can be communicated with */ 671 usb_pcwd->exists = 1; 672 673 /* disable card */ 674 usb_pcwd_stop(usb_pcwd); 675 676 /* Get the Firmware Version */ 677 got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor); 678 if (got_fw_rev) { 679 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor); 680 } else { 681 sprintf(fw_ver_str, "<card no answer>"); 682 } 683 684 printk(KERN_INFO PFX "Found card (Firmware: %s) with temp option\n", 685 fw_ver_str); 686 687 /* Get switch settings */ 688 usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy, &option_switches); 689 690 printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n", 691 option_switches, 692 ((option_switches & 0x10) ? "ON" : "OFF"), 693 ((option_switches & 0x08) ? "ON" : "OFF")); 694 695 /* If heartbeat = 0 then we use the heartbeat from the dip-switches */ 696 if (heartbeat == 0) 697 heartbeat = heartbeat_tbl[(option_switches & 0x07)]; 698 699 /* Check that the heartbeat value is within it's range ; if not reset to the default */ 700 if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) { 701 usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT); 702 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n", 703 WATCHDOG_HEARTBEAT); 704 } 705 706 retval = register_reboot_notifier(&usb_pcwd_notifier); 707 if (retval != 0) { 708 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", 709 retval); 710 goto error; 711 } 712 713 retval = misc_register(&usb_pcwd_temperature_miscdev); 714 if (retval != 0) { 715 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", 716 TEMP_MINOR, retval); 717 goto err_out_unregister_reboot; 718 } 719 720 retval = misc_register(&usb_pcwd_miscdev); 721 if (retval != 0) { 722 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", 723 WATCHDOG_MINOR, retval); 724 goto err_out_misc_deregister; 725 } 726 727 /* we can register the device now, as it is ready */ 728 usb_set_intfdata (interface, usb_pcwd); 729 730 printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", 731 heartbeat, nowayout); 732 733 return 0; 734 735err_out_misc_deregister: 736 misc_deregister(&usb_pcwd_temperature_miscdev); 737err_out_unregister_reboot: 738 unregister_reboot_notifier(&usb_pcwd_notifier); 739error: 740 if (usb_pcwd) 741 usb_pcwd_delete(usb_pcwd); 742 usb_pcwd_device = NULL; 743 return retval; 744} 745 746 747/** 748 * usb_pcwd_disconnect 749 * 750 * Called by the usb core when the device is removed from the system. 751 * 752 * This routine guarantees that the driver will not submit any more urbs 753 * by clearing dev->udev. 754 */ 755static void usb_pcwd_disconnect(struct usb_interface *interface) 756{ 757 struct usb_pcwd_private *usb_pcwd; 758 759 /* prevent races with open() */ 760 mutex_lock(&disconnect_mutex); 761 762 usb_pcwd = usb_get_intfdata (interface); 763 usb_set_intfdata (interface, NULL); 764 765 mutex_lock(&usb_pcwd->mtx); 766 767 /* Stop the timer before we leave */ 768 if (!nowayout) 769 usb_pcwd_stop(usb_pcwd); 770 771 /* We should now stop communicating with the USB PCWD device */ 772 usb_pcwd->exists = 0; 773 774 /* Deregister */ 775 misc_deregister(&usb_pcwd_miscdev); 776 misc_deregister(&usb_pcwd_temperature_miscdev); 777 unregister_reboot_notifier(&usb_pcwd_notifier); 778 779 mutex_unlock(&usb_pcwd->mtx); 780 781 /* Delete the USB PCWD device */ 782 usb_pcwd_delete(usb_pcwd); 783 784 cards_found--; 785 786 mutex_unlock(&disconnect_mutex); 787 788 printk(KERN_INFO PFX "USB PC Watchdog disconnected\n"); 789} 790 791 792 793/** 794 * usb_pcwd_init 795 */ 796static int __init usb_pcwd_init(void) 797{ 798 int result; 799 800 /* register this driver with the USB subsystem */ 801 result = usb_register(&usb_pcwd_driver); 802 if (result) { 803 printk(KERN_ERR PFX "usb_register failed. Error number %d\n", 804 result); 805 return result; 806 } 807 808 printk(KERN_INFO PFX DRIVER_DESC " v" DRIVER_VERSION " (" DRIVER_DATE ")\n"); 809 return 0; 810} 811 812 813/** 814 * usb_pcwd_exit 815 */ 816static void __exit usb_pcwd_exit(void) 817{ 818 /* deregister this driver with the USB subsystem */ 819 usb_deregister(&usb_pcwd_driver); 820} 821 822 823module_init (usb_pcwd_init); 824module_exit (usb_pcwd_exit); 825