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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 | /* * Berkshire USB-PC Watchdog Card Driver * * (c) Copyright 2004 Wim Van Sebroeck <wim@iguana.be>. * * Based on source code of the following authors: * Ken Hollis <kenji@bitgate.com>, * Alan Cox <alan@redhat.com>, * Matt Domsch <Matt_Domsch@dell.com>, * Rob Radez <rob@osinvestor.com>, * Greg Kroah-Hartman <greg@kroah.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor * provide warranty for any of this software. This material is * provided "AS-IS" and at no charge. * * Thanks also to Simon Machell at Berkshire Products Inc. for * providing the test hardware. More info is available at * http://www.berkprod.com/ or http://www.pcwatchdog.com/ */ #include <linux/kernel.h> #include <linux/errno.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/types.h> #include <linux/delay.h> #include <linux/miscdevice.h> #include <linux/watchdog.h> #include <linux/notifier.h> #include <linux/reboot.h> #include <linux/fs.h> #include <linux/smp_lock.h> #include <linux/completion.h> #include <asm/uaccess.h> #include <linux/usb.h> #include <linux/mutex.h> #include <linux/hid.h> /* For HID_REQ_SET_REPORT & HID_DT_REPORT */ #ifdef CONFIG_USB_DEBUG static int debug = 1; #else static int debug; #endif /* Use our own dbg macro */ #undef dbg #define dbg(format, arg...) do { if (debug) printk(KERN_DEBUG PFX format "\n" , ## arg); } while (0) /* Module and Version Information */ #define DRIVER_VERSION "1.01" #define DRIVER_DATE "15 Mar 2005" #define DRIVER_AUTHOR "Wim Van Sebroeck <wim@iguana.be>" #define DRIVER_DESC "Berkshire USB-PC Watchdog driver" #define DRIVER_LICENSE "GPL" #define DRIVER_NAME "pcwd_usb" #define PFX DRIVER_NAME ": " MODULE_AUTHOR(DRIVER_AUTHOR); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE(DRIVER_LICENSE); MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); MODULE_ALIAS_MISCDEV(TEMP_MINOR); /* Module Parameters */ module_param(debug, int, 0); MODULE_PARM_DESC(debug, "Debug enabled or not"); #define WATCHDOG_HEARTBEAT 2 /* 2 sec default heartbeat */ static int heartbeat = WATCHDOG_HEARTBEAT; module_param(heartbeat, int, 0); MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); static int nowayout = WATCHDOG_NOWAYOUT; module_param(nowayout, int, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); /* The vendor and product id's for the USB-PC Watchdog card */ #define USB_PCWD_VENDOR_ID 0x0c98 #define USB_PCWD_PRODUCT_ID 0x1140 /* table of devices that work with this driver */ static struct usb_device_id usb_pcwd_table [] = { { USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) }, { } /* Terminating entry */ }; MODULE_DEVICE_TABLE (usb, usb_pcwd_table); /* according to documentation max. time to process a command for the USB * watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */ #define USB_COMMAND_TIMEOUT 250 /* Watchdog's internal commands */ #define CMD_READ_TEMP 0x02 /* Read Temperature; Re-trigger Watchdog */ #define CMD_TRIGGER CMD_READ_TEMP #define CMD_GET_STATUS 0x04 /* Get Status Information */ #define CMD_GET_FIRMWARE_VERSION 0x08 /* Get Firmware Version */ #define CMD_GET_DIP_SWITCH_SETTINGS 0x0c /* Get Dip Switch Settings */ #define CMD_READ_WATCHDOG_TIMEOUT 0x18 /* Read Current Watchdog Time */ #define CMD_WRITE_WATCHDOG_TIMEOUT 0x19 /* Write Current Watchdog Time */ #define CMD_ENABLE_WATCHDOG 0x30 /* Enable / Disable Watchdog */ #define CMD_DISABLE_WATCHDOG CMD_ENABLE_WATCHDOG /* We can only use 1 card due to the /dev/watchdog restriction */ static int cards_found; /* some internal variables */ static unsigned long is_active; static char expect_release; /* Structure to hold all of our device specific stuff */ struct usb_pcwd_private { struct usb_device * udev; /* save off the usb device pointer */ struct usb_interface * interface; /* the interface for this device */ unsigned int interface_number; /* the interface number used for cmd's */ unsigned char * intr_buffer; /* the buffer to intr data */ dma_addr_t intr_dma; /* the dma address for the intr buffer */ size_t intr_size; /* the size of the intr buffer */ struct urb * intr_urb; /* the urb used for the intr pipe */ unsigned char cmd_command; /* The command that is reported back */ unsigned char cmd_data_msb; /* The data MSB that is reported back */ unsigned char cmd_data_lsb; /* The data LSB that is reported back */ atomic_t cmd_received; /* true if we received a report after a command */ int exists; /* Wether or not the device exists */ struct semaphore sem; /* locks this structure */ }; static struct usb_pcwd_private *usb_pcwd_device; /* prevent races between open() and disconnect() */ static DEFINE_MUTEX(disconnect_mutex); /* local function prototypes */ static int usb_pcwd_probe (struct usb_interface *interface, const struct usb_device_id *id); static void usb_pcwd_disconnect (struct usb_interface *interface); /* usb specific object needed to register this driver with the usb subsystem */ static struct usb_driver usb_pcwd_driver = { .name = DRIVER_NAME, .probe = usb_pcwd_probe, .disconnect = usb_pcwd_disconnect, .id_table = usb_pcwd_table, }; static void usb_pcwd_intr_done(struct urb *urb) { struct usb_pcwd_private *usb_pcwd = (struct usb_pcwd_private *)urb->context; unsigned char *data = usb_pcwd->intr_buffer; int retval; switch (urb->status) { case 0: /* success */ break; case -ECONNRESET: /* unlink */ case -ENOENT: case -ESHUTDOWN: /* this urb is terminated, clean up */ dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status); return; /* -EPIPE: should clear the halt */ default: /* error */ dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status); goto resubmit; } dbg("received following data cmd=0x%02x msb=0x%02x lsb=0x%02x", data[0], data[1], data[2]); usb_pcwd->cmd_command = data[0]; usb_pcwd->cmd_data_msb = data[1]; usb_pcwd->cmd_data_lsb = data[2]; /* notify anyone waiting that the cmd has finished */ atomic_set (&usb_pcwd->cmd_received, 1); resubmit: retval = usb_submit_urb (urb, GFP_ATOMIC); if (retval) printk(KERN_ERR PFX "can't resubmit intr, usb_submit_urb failed with result %d\n", retval); } static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd, unsigned char cmd, unsigned char *msb, unsigned char *lsb) { int got_response, count; unsigned char buf[6]; /* We will not send any commands if the USB PCWD device does not exist */ if ((!usb_pcwd) || (!usb_pcwd->exists)) return -1; /* The USB PC Watchdog uses a 6 byte report format. The board currently uses * only 3 of the six bytes of the report. */ buf[0] = cmd; /* Byte 0 = CMD */ buf[1] = *msb; /* Byte 1 = Data MSB */ buf[2] = *lsb; /* Byte 2 = Data LSB */ buf[3] = buf[4] = buf[5] = 0; /* All other bytes not used */ dbg("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x", buf[0], buf[1], buf[2]); atomic_set (&usb_pcwd->cmd_received, 0); if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0), HID_REQ_SET_REPORT, HID_DT_REPORT, 0x0200, usb_pcwd->interface_number, buf, sizeof(buf), USB_COMMAND_TIMEOUT) != sizeof(buf)) { dbg("usb_pcwd_send_command: error in usb_control_msg for cmd 0x%x 0x%x 0x%x\n", cmd, *msb, *lsb); } /* wait till the usb card processed the command, * with a max. timeout of USB_COMMAND_TIMEOUT */ got_response = 0; for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response); count++) { mdelay(1); if (atomic_read (&usb_pcwd->cmd_received)) got_response = 1; } if ((got_response) && (cmd == usb_pcwd->cmd_command)) { /* read back response */ *msb = usb_pcwd->cmd_data_msb; *lsb = usb_pcwd->cmd_data_lsb; } return got_response; } static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd) { unsigned char msb = 0x00; unsigned char lsb = 0x00; int retval; /* Enable Watchdog */ retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG, &msb, &lsb); if ((retval == 0) || (lsb == 0)) { printk(KERN_ERR PFX "Card did not acknowledge enable attempt\n"); return -1; } return 0; } static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd) { unsigned char msb = 0xA5; unsigned char lsb = 0xC3; int retval; /* Disable Watchdog */ retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG, &msb, &lsb); if ((retval == 0) || (lsb != 0)) { printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n"); return -1; } return 0; } static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd) { unsigned char dummy; /* Re-trigger Watchdog */ usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy); return 0; } static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t) { unsigned char msb = t / 256; unsigned char lsb = t % 256; if ((t < 0x0001) || (t > 0xFFFF)) return -EINVAL; /* Write new heartbeat to watchdog */ usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb); heartbeat = t; return 0; } static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd, int *temperature) { unsigned char msb, lsb; usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb); /* * Convert celsius to fahrenheit, since this was * the decided 'standard' for this return value. */ *temperature = (lsb * 9 / 5) + 32; return 0; } static int usb_pcwd_get_timeleft(struct usb_pcwd_private *usb_pcwd, int *time_left) { unsigned char msb, lsb; /* Read the time that's left before rebooting */ /* Note: if the board is not yet armed then we will read 0xFFFF */ usb_pcwd_send_command(usb_pcwd, CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb); *time_left = (msb << 8) + lsb; return 0; } /* * /dev/watchdog handling */ static ssize_t usb_pcwd_write(struct file *file, const char __user *data, size_t len, loff_t *ppos) { /* See if we got the magic character 'V' and reload the timer */ if (len) { if (!nowayout) { size_t i; /* note: just in case someone wrote the magic character * five months ago... */ expect_release = 0; /* scan to see whether or not we got the magic character */ for (i = 0; i != len; i++) { char c; if(get_user(c, data+i)) return -EFAULT; if (c == 'V') expect_release = 42; } } /* someone wrote to us, we should reload the timer */ usb_pcwd_keepalive(usb_pcwd_device); } return len; } static int usb_pcwd_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { void __user *argp = (void __user *)arg; int __user *p = argp; static struct watchdog_info ident = { .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, .firmware_version = 1, .identity = DRIVER_NAME, }; switch (cmd) { case WDIOC_GETSUPPORT: return copy_to_user(argp, &ident, sizeof (ident)) ? -EFAULT : 0; case WDIOC_GETSTATUS: case WDIOC_GETBOOTSTATUS: return put_user(0, p); case WDIOC_GETTEMP: { int temperature; if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature)) return -EFAULT; return put_user(temperature, p); } case WDIOC_KEEPALIVE: usb_pcwd_keepalive(usb_pcwd_device); return 0; case WDIOC_SETOPTIONS: { int new_options, retval = -EINVAL; if (get_user (new_options, p)) return -EFAULT; if (new_options & WDIOS_DISABLECARD) { usb_pcwd_stop(usb_pcwd_device); retval = 0; } if (new_options & WDIOS_ENABLECARD) { usb_pcwd_start(usb_pcwd_device); retval = 0; } return retval; } case WDIOC_SETTIMEOUT: { int new_heartbeat; if (get_user(new_heartbeat, p)) return -EFAULT; if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat)) return -EINVAL; usb_pcwd_keepalive(usb_pcwd_device); /* Fall */ } case WDIOC_GETTIMEOUT: return put_user(heartbeat, p); case WDIOC_GETTIMELEFT: { int time_left; if (usb_pcwd_get_timeleft(usb_pcwd_device, &time_left)) return -EFAULT; return put_user(time_left, p); } default: return -ENOTTY; } } static int usb_pcwd_open(struct inode *inode, struct file *file) { /* /dev/watchdog can only be opened once */ if (test_and_set_bit(0, &is_active)) return -EBUSY; /* Activate */ usb_pcwd_start(usb_pcwd_device); usb_pcwd_keepalive(usb_pcwd_device); return nonseekable_open(inode, file); } static int usb_pcwd_release(struct inode *inode, struct file *file) { /* * Shut off the timer. */ if (expect_release == 42) { usb_pcwd_stop(usb_pcwd_device); } else { printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); usb_pcwd_keepalive(usb_pcwd_device); } expect_release = 0; clear_bit(0, &is_active); return 0; } /* * /dev/temperature handling */ static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data, size_t len, loff_t *ppos) { int temperature; if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature)) return -EFAULT; if (copy_to_user(data, &temperature, 1)) return -EFAULT; return 1; } static int usb_pcwd_temperature_open(struct inode *inode, struct file *file) { return nonseekable_open(inode, file); } static int usb_pcwd_temperature_release(struct inode *inode, struct file *file) { return 0; } /* * Notify system */ static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused) { if (code==SYS_DOWN || code==SYS_HALT) { /* Turn the WDT off */ usb_pcwd_stop(usb_pcwd_device); } return NOTIFY_DONE; } /* * Kernel Interfaces */ static const struct file_operations usb_pcwd_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .write = usb_pcwd_write, .ioctl = usb_pcwd_ioctl, .open = usb_pcwd_open, .release = usb_pcwd_release, }; static struct miscdevice usb_pcwd_miscdev = { .minor = WATCHDOG_MINOR, .name = "watchdog", .fops = &usb_pcwd_fops, }; static const struct file_operations usb_pcwd_temperature_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .read = usb_pcwd_temperature_read, .open = usb_pcwd_temperature_open, .release = usb_pcwd_temperature_release, }; static struct miscdevice usb_pcwd_temperature_miscdev = { .minor = TEMP_MINOR, .name = "temperature", .fops = &usb_pcwd_temperature_fops, }; static struct notifier_block usb_pcwd_notifier = { .notifier_call = usb_pcwd_notify_sys, }; /** * usb_pcwd_delete */ static inline void usb_pcwd_delete (struct usb_pcwd_private *usb_pcwd) { usb_free_urb(usb_pcwd->intr_urb); if (usb_pcwd->intr_buffer != NULL) usb_buffer_free(usb_pcwd->udev, usb_pcwd->intr_size, usb_pcwd->intr_buffer, usb_pcwd->intr_dma); kfree (usb_pcwd); } /** * usb_pcwd_probe * * Called by the usb core when a new device is connected that it thinks * this driver might be interested in. */ static int usb_pcwd_probe(struct usb_interface *interface, const struct usb_device_id *id) { struct usb_device *udev = interface_to_usbdev(interface); struct usb_host_interface *iface_desc; struct usb_endpoint_descriptor *endpoint; struct usb_pcwd_private *usb_pcwd = NULL; int pipe, maxp; int retval = -ENOMEM; int got_fw_rev; unsigned char fw_rev_major, fw_rev_minor; char fw_ver_str[20]; unsigned char option_switches, dummy; cards_found++; if (cards_found > 1) { printk(KERN_ERR PFX "This driver only supports 1 device\n"); return -ENODEV; } /* get the active interface descriptor */ iface_desc = interface->cur_altsetting; /* check out that we have a HID device */ if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) { printk(KERN_ERR PFX "The device isn't a Human Interface Device\n"); return -ENODEV; } /* check out the endpoint: it has to be Interrupt & IN */ endpoint = &iface_desc->endpoint[0].desc; if (!((endpoint->bEndpointAddress & USB_DIR_IN) && ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT))) { /* we didn't find a Interrupt endpoint with direction IN */ printk(KERN_ERR PFX "Couldn't find an INTR & IN endpoint\n"); return -ENODEV; } /* get a handle to the interrupt data pipe */ pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress); maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe)); /* allocate memory for our device and initialize it */ usb_pcwd = kmalloc (sizeof(struct usb_pcwd_private), GFP_KERNEL); if (usb_pcwd == NULL) { printk(KERN_ERR PFX "Out of memory\n"); goto error; } memset (usb_pcwd, 0x00, sizeof (*usb_pcwd)); usb_pcwd_device = usb_pcwd; init_MUTEX (&usb_pcwd->sem); usb_pcwd->udev = udev; usb_pcwd->interface = interface; usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber; usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ? le16_to_cpu(endpoint->wMaxPacketSize) : 8); /* set up the memory buffer's */ if (!(usb_pcwd->intr_buffer = usb_buffer_alloc(udev, usb_pcwd->intr_size, GFP_ATOMIC, &usb_pcwd->intr_dma))) { printk(KERN_ERR PFX "Out of memory\n"); goto error; } /* allocate the urb's */ usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL); if (!usb_pcwd->intr_urb) { printk(KERN_ERR PFX "Out of memory\n"); goto error; } /* initialise the intr urb's */ usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe, usb_pcwd->intr_buffer, usb_pcwd->intr_size, usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval); usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma; usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; /* register our interrupt URB with the USB system */ if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) { printk(KERN_ERR PFX "Problem registering interrupt URB\n"); retval = -EIO; /* failure */ goto error; } /* The device exists and can be communicated with */ usb_pcwd->exists = 1; /* disable card */ usb_pcwd_stop(usb_pcwd); /* Get the Firmware Version */ got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor); if (got_fw_rev) { sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor); } else { sprintf(fw_ver_str, "<card no answer>"); } printk(KERN_INFO PFX "Found card (Firmware: %s) with temp option\n", fw_ver_str); /* Get switch settings */ usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy, &option_switches); printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n", option_switches, ((option_switches & 0x10) ? "ON" : "OFF"), ((option_switches & 0x08) ? "ON" : "OFF")); /* Check that the heartbeat value is within it's range ; if not reset to the default */ if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) { usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT); printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n", WATCHDOG_HEARTBEAT); } retval = register_reboot_notifier(&usb_pcwd_notifier); if (retval != 0) { printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", retval); goto error; } retval = misc_register(&usb_pcwd_temperature_miscdev); if (retval != 0) { printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", TEMP_MINOR, retval); goto err_out_unregister_reboot; } retval = misc_register(&usb_pcwd_miscdev); if (retval != 0) { printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", WATCHDOG_MINOR, retval); goto err_out_misc_deregister; } /* we can register the device now, as it is ready */ usb_set_intfdata (interface, usb_pcwd); printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", heartbeat, nowayout); return 0; err_out_misc_deregister: misc_deregister(&usb_pcwd_temperature_miscdev); err_out_unregister_reboot: unregister_reboot_notifier(&usb_pcwd_notifier); error: if (usb_pcwd) usb_pcwd_delete(usb_pcwd); usb_pcwd_device = NULL; return retval; } /** * usb_pcwd_disconnect * * Called by the usb core when the device is removed from the system. * * This routine guarantees that the driver will not submit any more urbs * by clearing dev->udev. */ static void usb_pcwd_disconnect(struct usb_interface *interface) { struct usb_pcwd_private *usb_pcwd; /* prevent races with open() */ mutex_lock(&disconnect_mutex); usb_pcwd = usb_get_intfdata (interface); usb_set_intfdata (interface, NULL); down (&usb_pcwd->sem); /* Stop the timer before we leave */ if (!nowayout) usb_pcwd_stop(usb_pcwd); /* We should now stop communicating with the USB PCWD device */ usb_pcwd->exists = 0; /* Deregister */ misc_deregister(&usb_pcwd_miscdev); misc_deregister(&usb_pcwd_temperature_miscdev); unregister_reboot_notifier(&usb_pcwd_notifier); up (&usb_pcwd->sem); /* Delete the USB PCWD device */ usb_pcwd_delete(usb_pcwd); cards_found--; mutex_unlock(&disconnect_mutex); printk(KERN_INFO PFX "USB PC Watchdog disconnected\n"); } /** * usb_pcwd_init */ static int __init usb_pcwd_init(void) { int result; /* register this driver with the USB subsystem */ result = usb_register(&usb_pcwd_driver); if (result) { printk(KERN_ERR PFX "usb_register failed. Error number %d\n", result); return result; } printk(KERN_INFO PFX DRIVER_DESC " v" DRIVER_VERSION " (" DRIVER_DATE ")\n"); return 0; } /** * usb_pcwd_exit */ static void __exit usb_pcwd_exit(void) { /* deregister this driver with the USB subsystem */ usb_deregister(&usb_pcwd_driver); } module_init (usb_pcwd_init); module_exit (usb_pcwd_exit); |