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...) 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 66 MODULE_AUTHOR(DRIVER_AUTHOR); 67 MODULE_DESCRIPTION(DRIVER_DESC); 68 MODULE_LICENSE(DRIVER_LICENSE); 69 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); 70 MODULE_ALIAS_MISCDEV(TEMP_MINOR); 71 72 /* Module Parameters */ 73 module_param(debug, int, 0); 74 MODULE_PARM_DESC(debug, "Debug enabled or not"); 75 76 #define WATCHDOG_HEARTBEAT 0 /* default heartbeat = delay-time from dip-switches */ 77 static int heartbeat = WATCHDOG_HEARTBEAT; 78 module_param(heartbeat, int, 0); 79 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536 or 0=delay-time from dip-switches, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); 80 81 static int nowayout = WATCHDOG_NOWAYOUT; 82 module_param(nowayout, int, 0); 83 MODULE_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 */ 90 static struct usb_device_id usb_pcwd_table[] = { 91 { USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) }, 92 { } /* Terminating entry */ 93 }; 94 MODULE_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 */ 112 static 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 */ 124 static int cards_found; 125 126 /* some internal variables */ 127 static unsigned long is_active; 128 static char expect_release; 129 130 /* Structure to hold all of our device specific stuff */ 131 struct 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 }; 150 static struct usb_pcwd_private *usb_pcwd_device; 151 152 /* prevent races between open() and disconnect() */ 153 static DEFINE_MUTEX(disconnect_mutex); 154 155 /* local function prototypes */ 156 static int usb_pcwd_probe(struct usb_interface *interface, const struct usb_device_id *id); 157 static void usb_pcwd_disconnect(struct usb_interface *interface); 158 159 /* usb specific object needed to register this driver with the usb subsystem */ 160 static 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 }; 166 167 168 static 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); 198 199 resubmit: 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 } 205 206 static 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 } 251 252 static 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 } 268 269 static 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 } 285 286 static 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 } 295 296 static 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 } 310 311 static 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 } 325 326 static 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 */ 342 343 static 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 } 370 371 static long usb_pcwd_ioctl(struct file *file, unsigned int cmd, 372 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, sizeof(ident)) ? -EFAULT : 0; 387 388 case WDIOC_GETSTATUS: 389 case WDIOC_GETBOOTSTATUS: 390 return put_user(0, p); 391 392 case WDIOC_GETTEMP: 393 { 394 int temperature; 395 396 if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature)) 397 return -EFAULT; 398 399 return put_user(temperature, p); 400 } 401 402 case WDIOC_SETOPTIONS: 403 { 404 int new_options, retval = -EINVAL; 405 406 if (get_user(new_options, p)) 407 return -EFAULT; 408 409 if (new_options & WDIOS_DISABLECARD) { 410 usb_pcwd_stop(usb_pcwd_device); 411 retval = 0; 412 } 413 414 if (new_options & WDIOS_ENABLECARD) { 415 usb_pcwd_start(usb_pcwd_device); 416 retval = 0; 417 } 418 419 return retval; 420 } 421 422 case WDIOC_KEEPALIVE: 423 usb_pcwd_keepalive(usb_pcwd_device); 424 return 0; 425 426 case WDIOC_SETTIMEOUT: 427 { 428 int new_heartbeat; 429 430 if (get_user(new_heartbeat, p)) 431 return -EFAULT; 432 433 if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat)) 434 return -EINVAL; 435 436 usb_pcwd_keepalive(usb_pcwd_device); 437 /* Fall */ 438 } 439 440 case WDIOC_GETTIMEOUT: 441 return put_user(heartbeat, p); 442 443 case WDIOC_GETTIMELEFT: 444 { 445 int time_left; 446 447 if (usb_pcwd_get_timeleft(usb_pcwd_device, &time_left)) 448 return -EFAULT; 449 450 return put_user(time_left, p); 451 } 452 453 default: 454 return -ENOTTY; 455 } 456 } 457 458 static int usb_pcwd_open(struct inode *inode, struct file *file) 459 { 460 /* /dev/watchdog can only be opened once */ 461 if (test_and_set_bit(0, &is_active)) 462 return -EBUSY; 463 464 /* Activate */ 465 usb_pcwd_start(usb_pcwd_device); 466 usb_pcwd_keepalive(usb_pcwd_device); 467 return nonseekable_open(inode, file); 468 } 469 470 static int usb_pcwd_release(struct inode *inode, struct file *file) 471 { 472 /* 473 * Shut off the timer. 474 */ 475 if (expect_release == 42) { 476 usb_pcwd_stop(usb_pcwd_device); 477 } else { 478 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); 479 usb_pcwd_keepalive(usb_pcwd_device); 480 } 481 expect_release = 0; 482 clear_bit(0, &is_active); 483 return 0; 484 } 485 486 /* 487 * /dev/temperature handling 488 */ 489 490 static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data, 491 size_t len, loff_t *ppos) 492 { 493 int temperature; 494 495 if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature)) 496 return -EFAULT; 497 498 if (copy_to_user(data, &temperature, 1)) 499 return -EFAULT; 500 501 return 1; 502 } 503 504 static int usb_pcwd_temperature_open(struct inode *inode, struct file *file) 505 { 506 return nonseekable_open(inode, file); 507 } 508 509 static int usb_pcwd_temperature_release(struct inode *inode, struct file *file) 510 { 511 return 0; 512 } 513 514 /* 515 * Notify system 516 */ 517 518 static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused) 519 { 520 if (code == SYS_DOWN || code == SYS_HALT) 521 usb_pcwd_stop(usb_pcwd_device); /* Turn the WDT off */ 522 523 return NOTIFY_DONE; 524 } 525 526 /* 527 * Kernel Interfaces 528 */ 529 530 static const struct file_operations usb_pcwd_fops = { 531 .owner = THIS_MODULE, 532 .llseek = no_llseek, 533 .write = usb_pcwd_write, 534 .unlocked_ioctl = usb_pcwd_ioctl, 535 .open = usb_pcwd_open, 536 .release = usb_pcwd_release, 537 }; 538 539 static struct miscdevice usb_pcwd_miscdev = { 540 .minor = WATCHDOG_MINOR, 541 .name = "watchdog", 542 .fops = &usb_pcwd_fops, 543 }; 544 545 static const struct file_operations usb_pcwd_temperature_fops = { 546 .owner = THIS_MODULE, 547 .llseek = no_llseek, 548 .read = usb_pcwd_temperature_read, 549 .open = usb_pcwd_temperature_open, 550 .release = usb_pcwd_temperature_release, 551 }; 552 553 static struct miscdevice usb_pcwd_temperature_miscdev = { 554 .minor = TEMP_MINOR, 555 .name = "temperature", 556 .fops = &usb_pcwd_temperature_fops, 557 }; 558 559 static struct notifier_block usb_pcwd_notifier = { 560 .notifier_call = usb_pcwd_notify_sys, 561 }; 562 563 /** 564 * usb_pcwd_delete 565 */ 566 static inline void usb_pcwd_delete(struct usb_pcwd_private *usb_pcwd) 567 { 568 usb_free_urb(usb_pcwd->intr_urb); 569 if (usb_pcwd->intr_buffer != NULL) 570 usb_buffer_free(usb_pcwd->udev, usb_pcwd->intr_size, 571 usb_pcwd->intr_buffer, usb_pcwd->intr_dma); 572 kfree(usb_pcwd); 573 } 574 575 /** 576 * usb_pcwd_probe 577 * 578 * Called by the usb core when a new device is connected that it thinks 579 * this driver might be interested in. 580 */ 581 static int usb_pcwd_probe(struct usb_interface *interface, const struct usb_device_id *id) 582 { 583 struct usb_device *udev = interface_to_usbdev(interface); 584 struct usb_host_interface *iface_desc; 585 struct usb_endpoint_descriptor *endpoint; 586 struct usb_pcwd_private *usb_pcwd = NULL; 587 int pipe, maxp; 588 int retval = -ENOMEM; 589 int got_fw_rev; 590 unsigned char fw_rev_major, fw_rev_minor; 591 char fw_ver_str[20]; 592 unsigned char option_switches, dummy; 593 594 cards_found++; 595 if (cards_found > 1) { 596 printk(KERN_ERR PFX "This driver only supports 1 device\n"); 597 return -ENODEV; 598 } 599 600 /* get the active interface descriptor */ 601 iface_desc = interface->cur_altsetting; 602 603 /* check out that we have a HID device */ 604 if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) { 605 printk(KERN_ERR PFX "The device isn't a Human Interface Device\n"); 606 return -ENODEV; 607 } 608 609 /* check out the endpoint: it has to be Interrupt & IN */ 610 endpoint = &iface_desc->endpoint[0].desc; 611 612 if (!((endpoint->bEndpointAddress & USB_DIR_IN) && 613 ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) 614 == USB_ENDPOINT_XFER_INT))) { 615 /* we didn't find a Interrupt endpoint with direction IN */ 616 printk(KERN_ERR PFX "Couldn't find an INTR & IN endpoint\n"); 617 return -ENODEV; 618 } 619 620 /* get a handle to the interrupt data pipe */ 621 pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress); 622 maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe)); 623 624 /* allocate memory for our device and initialize it */ 625 usb_pcwd = kzalloc(sizeof(struct usb_pcwd_private), GFP_KERNEL); 626 if (usb_pcwd == NULL) { 627 printk(KERN_ERR PFX "Out of memory\n"); 628 goto error; 629 } 630 631 usb_pcwd_device = usb_pcwd; 632 633 mutex_init(&usb_pcwd->mtx); 634 usb_pcwd->udev = udev; 635 usb_pcwd->interface = interface; 636 usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber; 637 usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ? le16_to_cpu(endpoint->wMaxPacketSize) : 8); 638 639 /* set up the memory buffer's */ 640 usb_pcwd->intr_buffer = usb_buffer_alloc(udev, usb_pcwd->intr_size, GFP_ATOMIC, &usb_pcwd->intr_dma); 641 if (!usb_pcwd->intr_buffer) { 642 printk(KERN_ERR PFX "Out of memory\n"); 643 goto error; 644 } 645 646 /* allocate the urb's */ 647 usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL); 648 if (!usb_pcwd->intr_urb) { 649 printk(KERN_ERR PFX "Out of memory\n"); 650 goto error; 651 } 652 653 /* initialise the intr urb's */ 654 usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe, 655 usb_pcwd->intr_buffer, usb_pcwd->intr_size, 656 usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval); 657 usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma; 658 usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 659 660 /* register our interrupt URB with the USB system */ 661 if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) { 662 printk(KERN_ERR PFX "Problem registering interrupt URB\n"); 663 retval = -EIO; /* failure */ 664 goto error; 665 } 666 667 /* The device exists and can be communicated with */ 668 usb_pcwd->exists = 1; 669 670 /* disable card */ 671 usb_pcwd_stop(usb_pcwd); 672 673 /* Get the Firmware Version */ 674 got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor); 675 if (got_fw_rev) 676 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor); 677 else 678 sprintf(fw_ver_str, "<card no answer>"); 679 680 printk(KERN_INFO PFX "Found card (Firmware: %s) with temp option\n", 681 fw_ver_str); 682 683 /* Get switch settings */ 684 usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy, &option_switches); 685 686 printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n", 687 option_switches, 688 ((option_switches & 0x10) ? "ON" : "OFF"), 689 ((option_switches & 0x08) ? "ON" : "OFF")); 690 691 /* If heartbeat = 0 then we use the heartbeat from the dip-switches */ 692 if (heartbeat == 0) 693 heartbeat = heartbeat_tbl[(option_switches & 0x07)]; 694 695 /* Check that the heartbeat value is within it's range ; if not reset to the default */ 696 if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) { 697 usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT); 698 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n", 699 WATCHDOG_HEARTBEAT); 700 } 701 702 retval = register_reboot_notifier(&usb_pcwd_notifier); 703 if (retval != 0) { 704 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", 705 retval); 706 goto error; 707 } 708 709 retval = misc_register(&usb_pcwd_temperature_miscdev); 710 if (retval != 0) { 711 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", 712 TEMP_MINOR, retval); 713 goto err_out_unregister_reboot; 714 } 715 716 retval = misc_register(&usb_pcwd_miscdev); 717 if (retval != 0) { 718 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", 719 WATCHDOG_MINOR, retval); 720 goto err_out_misc_deregister; 721 } 722 723 /* we can register the device now, as it is ready */ 724 usb_set_intfdata(interface, usb_pcwd); 725 726 printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", 727 heartbeat, nowayout); 728 729 return 0; 730 731 err_out_misc_deregister: 732 misc_deregister(&usb_pcwd_temperature_miscdev); 733 err_out_unregister_reboot: 734 unregister_reboot_notifier(&usb_pcwd_notifier); 735 error: 736 if (usb_pcwd) 737 usb_pcwd_delete(usb_pcwd); 738 usb_pcwd_device = NULL; 739 return retval; 740 } 741 742 743 /** 744 * usb_pcwd_disconnect 745 * 746 * Called by the usb core when the device is removed from the system. 747 * 748 * This routine guarantees that the driver will not submit any more urbs 749 * by clearing dev->udev. 750 */ 751 static void usb_pcwd_disconnect(struct usb_interface *interface) 752 { 753 struct usb_pcwd_private *usb_pcwd; 754 755 /* prevent races with open() */ 756 mutex_lock(&disconnect_mutex); 757 758 usb_pcwd = usb_get_intfdata(interface); 759 usb_set_intfdata(interface, NULL); 760 761 mutex_lock(&usb_pcwd->mtx); 762 763 /* Stop the timer before we leave */ 764 if (!nowayout) 765 usb_pcwd_stop(usb_pcwd); 766 767 /* We should now stop communicating with the USB PCWD device */ 768 usb_pcwd->exists = 0; 769 770 /* Deregister */ 771 misc_deregister(&usb_pcwd_miscdev); 772 misc_deregister(&usb_pcwd_temperature_miscdev); 773 unregister_reboot_notifier(&usb_pcwd_notifier); 774 775 mutex_unlock(&usb_pcwd->mtx); 776 777 /* Delete the USB PCWD device */ 778 usb_pcwd_delete(usb_pcwd); 779 780 cards_found--; 781 782 mutex_unlock(&disconnect_mutex); 783 784 printk(KERN_INFO PFX "USB PC Watchdog disconnected\n"); 785 } 786 787 788 789 /** 790 * usb_pcwd_init 791 */ 792 static int __init usb_pcwd_init(void) 793 { 794 int result; 795 796 /* register this driver with the USB subsystem */ 797 result = usb_register(&usb_pcwd_driver); 798 if (result) { 799 printk(KERN_ERR PFX "usb_register failed. Error number %d\n", 800 result); 801 return result; 802 } 803 804 printk(KERN_INFO PFX DRIVER_DESC " v" DRIVER_VERSION " (" DRIVER_DATE ")\n"); 805 return 0; 806 } 807 808 809 /** 810 * usb_pcwd_exit 811 */ 812 static void __exit usb_pcwd_exit(void) 813 { 814 /* deregister this driver with the USB subsystem */ 815 usb_deregister(&usb_pcwd_driver); 816 } 817 818 819 module_init(usb_pcwd_init); 820 module_exit(usb_pcwd_exit); 821