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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Berkshire PCI-PC Watchdog Card Driver
3 *
Wim Van Sebroeckb3faed62005-10-22 16:27:19 +02004 * (c) Copyright 2003-2005 Wim Van Sebroeck <wim@iguana.be>.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
6 * Based on source code of the following authors:
7 * Ken Hollis <kenji@bitgate.com>,
8 * Lindsay Harris <lindsay@bluegum.com>,
9 * Alan Cox <alan@redhat.com>,
10 * Matt Domsch <Matt_Domsch@dell.com>,
11 * Rob Radez <rob@osinvestor.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
23/*
Wim Van Sebroeck58b519f2006-05-21 12:48:44 +020024 * A bells and whistles driver is available from:
Wim Van Sebroeckb3faed62005-10-22 16:27:19 +020025 * http://www.kernel.org/pub/linux/kernel/people/wim/pcwd/pcwd_pci/
26 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070027 * More info available at http://www.berkprod.com/ or http://www.pcwatchdog.com/
28 */
29
30/*
31 * Includes, defines, variables, module parameters, ...
32 */
33
Wim Van Sebroeckc315b7e82005-09-12 00:21:19 +020034#include <linux/module.h> /* For module specific items */
35#include <linux/moduleparam.h> /* For new moduleparam's */
36#include <linux/types.h> /* For standard types (like size_t) */
37#include <linux/errno.h> /* For the -ENODEV/... values */
38#include <linux/kernel.h> /* For printk/panic/... */
39#include <linux/delay.h> /* For mdelay function */
40#include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */
41#include <linux/watchdog.h> /* For the watchdog specific items */
42#include <linux/notifier.h> /* For notifier support */
43#include <linux/reboot.h> /* For reboot_notifier stuff */
44#include <linux/init.h> /* For __init/__exit/... */
45#include <linux/fs.h> /* For file operations */
46#include <linux/pci.h> /* For pci functions */
47#include <linux/ioport.h> /* For io-port access */
48#include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Wim Van Sebroeckc315b7e82005-09-12 00:21:19 +020050#include <asm/uaccess.h> /* For copy_to_user/put_user/... */
51#include <asm/io.h> /* For inb/outb/... */
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53/* Module and version information */
Wim Van Sebroecka0800f62005-09-29 16:21:50 +020054#define WATCHDOG_VERSION "1.02"
55#define WATCHDOG_DATE "03 Sep 2005"
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog"
57#define WATCHDOG_NAME "pcwd_pci"
58#define PFX WATCHDOG_NAME ": "
59#define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION " (" WATCHDOG_DATE ")\n"
60
61/* Stuff for the PCI ID's */
62#ifndef PCI_VENDOR_ID_QUICKLOGIC
63#define PCI_VENDOR_ID_QUICKLOGIC 0x11e3
64#endif
65
66#ifndef PCI_DEVICE_ID_WATCHDOG_PCIPCWD
67#define PCI_DEVICE_ID_WATCHDOG_PCIPCWD 0x5030
68#endif
69
70/*
71 * These are the defines that describe the control status bits for the
72 * PCI-PC Watchdog card.
73 */
Wim Van Sebroecka0800f62005-09-29 16:21:50 +020074/* Port 1 : Control Status #1 */
75#define WD_PCI_WTRP 0x01 /* Watchdog Trip status */
76#define WD_PCI_HRBT 0x02 /* Watchdog Heartbeat */
77#define WD_PCI_TTRP 0x04 /* Temperature Trip status */
78#define WD_PCI_RL2A 0x08 /* Relay 2 Active */
79#define WD_PCI_RL1A 0x10 /* Relay 1 Active */
80#define WD_PCI_R2DS 0x40 /* Relay 2 Disable Temperature-trip/reset */
81#define WD_PCI_RLY2 0x80 /* Activate Relay 2 on the board */
82/* Port 2 : Control Status #2 */
83#define WD_PCI_WDIS 0x10 /* Watchdog Disable */
84#define WD_PCI_ENTP 0x20 /* Enable Temperature Trip Reset */
85#define WD_PCI_WRSP 0x40 /* Watchdog wrote response */
86#define WD_PCI_PCMD 0x80 /* PC has sent command */
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88/* according to documentation max. time to process a command for the pci
89 * watchdog card is 100 ms, so we give it 150 ms to do it's job */
90#define PCI_COMMAND_TIMEOUT 150
91
92/* Watchdog's internal commands */
Wim Van Sebroecka0800f62005-09-29 16:21:50 +020093#define CMD_GET_STATUS 0x04
94#define CMD_GET_FIRMWARE_VERSION 0x08
95#define CMD_READ_WATCHDOG_TIMEOUT 0x18
96#define CMD_WRITE_WATCHDOG_TIMEOUT 0x19
97#define CMD_GET_CLEAR_RESET_COUNT 0x84
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
99/* We can only use 1 card due to the /dev/watchdog restriction */
100static int cards_found;
101
102/* internal variables */
103static int temp_panic;
104static unsigned long is_active;
105static char expect_release;
Wim Van Sebroecka0800f62005-09-29 16:21:50 +0200106static struct { /* this is private data for each PCI-PC watchdog card */
107 int supports_temp; /* Wether or not the card has a temperature device */
108 int boot_status; /* The card's boot status */
109 unsigned long io_addr; /* The cards I/O address */
110 spinlock_t io_lock; /* the lock for io operations */
111 struct pci_dev *pdev; /* the PCI-device */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112} pcipcwd_private;
113
114/* module parameters */
Wim Van Sebroeck195331d2005-09-29 16:22:30 +0200115#define QUIET 0 /* Default */
116#define VERBOSE 1 /* Verbose */
117#define DEBUG 2 /* print fancy stuff too */
118static int debug = QUIET;
119module_param(debug, int, 0);
120MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
121
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122#define WATCHDOG_HEARTBEAT 2 /* 2 sec default heartbeat */
123static int heartbeat = WATCHDOG_HEARTBEAT;
124module_param(heartbeat, int, 0);
125MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
126
Andrey Panin4bfdf372005-07-27 11:43:58 -0700127static int nowayout = WATCHDOG_NOWAYOUT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128module_param(nowayout, int, 0);
129MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
130
131/*
132 * Internal functions
133 */
134
135static int send_command(int cmd, int *msb, int *lsb)
136{
137 int got_response, count;
138
Wim Van Sebroeck195331d2005-09-29 16:22:30 +0200139 if (debug >= DEBUG)
140 printk(KERN_DEBUG PFX "sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x\n",
141 cmd, *msb, *lsb);
142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 spin_lock(&pcipcwd_private.io_lock);
144 /* If a command requires data it should be written first.
145 * Data for commands with 8 bits of data should be written to port 4.
146 * Commands with 16 bits of data, should be written as LSB to port 4
147 * and MSB to port 5.
148 * After the required data has been written then write the command to
149 * port 6. */
150 outb_p(*lsb, pcipcwd_private.io_addr + 4);
151 outb_p(*msb, pcipcwd_private.io_addr + 5);
152 outb_p(cmd, pcipcwd_private.io_addr + 6);
153
154 /* wait till the pci card processed the command, signaled by
155 * the WRSP bit in port 2 and give it a max. timeout of
156 * PCI_COMMAND_TIMEOUT to process */
Wim Van Sebroecka0800f62005-09-29 16:21:50 +0200157 got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response); count++) {
159 mdelay(1);
Wim Van Sebroecka0800f62005-09-29 16:21:50 +0200160 got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 }
162
Wim Van Sebroeck195331d2005-09-29 16:22:30 +0200163 if (debug >= DEBUG) {
164 if (got_response) {
165 printk(KERN_DEBUG PFX "time to process command was: %d ms\n",
166 count);
167 } else {
168 printk(KERN_DEBUG PFX "card did not respond on command!\n");
169 }
170 }
171
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 if (got_response) {
173 /* read back response */
174 *lsb = inb_p(pcipcwd_private.io_addr + 4);
175 *msb = inb_p(pcipcwd_private.io_addr + 5);
176
177 /* clear WRSP bit */
178 inb_p(pcipcwd_private.io_addr + 6);
Wim Van Sebroeck195331d2005-09-29 16:22:30 +0200179
180 if (debug >= DEBUG)
181 printk(KERN_DEBUG PFX "received following data for cmd=0x%02x: msb=0x%02x lsb=0x%02x\n",
182 cmd, *msb, *lsb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 }
Wim Van Sebroeck195331d2005-09-29 16:22:30 +0200184
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 spin_unlock(&pcipcwd_private.io_lock);
186
187 return got_response;
188}
189
Wim Van Sebroecka0800f62005-09-29 16:21:50 +0200190static inline void pcipcwd_check_temperature_support(void)
191{
192 if (inb_p(pcipcwd_private.io_addr) != 0xF0)
193 pcipcwd_private.supports_temp = 1;
194}
195
196static int pcipcwd_get_option_switches(void)
197{
198 int option_switches;
199
200 option_switches = inb_p(pcipcwd_private.io_addr + 3);
201 return option_switches;
202}
203
204static void pcipcwd_show_card_info(void)
205{
206 int got_fw_rev, fw_rev_major, fw_rev_minor;
207 char fw_ver_str[20]; /* The cards firmware version */
208 int option_switches;
209
210 got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor);
211 if (got_fw_rev) {
212 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
213 } else {
214 sprintf(fw_ver_str, "<card no answer>");
215 }
216
217 /* Get switch settings */
218 option_switches = pcipcwd_get_option_switches();
219
220 printk(KERN_INFO PFX "Found card at port 0x%04x (Firmware: %s) %s temp option\n",
221 (int) pcipcwd_private.io_addr, fw_ver_str,
222 (pcipcwd_private.supports_temp ? "with" : "without"));
223
224 printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
225 option_switches,
226 ((option_switches & 0x10) ? "ON" : "OFF"),
227 ((option_switches & 0x08) ? "ON" : "OFF"));
228
229 if (pcipcwd_private.boot_status & WDIOF_CARDRESET)
230 printk(KERN_INFO PFX "Previous reset was caused by the Watchdog card\n");
231
232 if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
233 printk(KERN_INFO PFX "Card sensed a CPU Overheat\n");
234
235 if (pcipcwd_private.boot_status == 0)
236 printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n");
237}
238
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239static int pcipcwd_start(void)
240{
241 int stat_reg;
242
243 spin_lock(&pcipcwd_private.io_lock);
244 outb_p(0x00, pcipcwd_private.io_addr + 3);
245 udelay(1000);
246
247 stat_reg = inb_p(pcipcwd_private.io_addr + 2);
248 spin_unlock(&pcipcwd_private.io_lock);
249
Wim Van Sebroecka0800f62005-09-29 16:21:50 +0200250 if (stat_reg & WD_PCI_WDIS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 printk(KERN_ERR PFX "Card timer not enabled\n");
252 return -1;
253 }
254
Wim Van Sebroeck195331d2005-09-29 16:22:30 +0200255 if (debug >= VERBOSE)
256 printk(KERN_DEBUG PFX "Watchdog started\n");
257
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 return 0;
259}
260
261static int pcipcwd_stop(void)
262{
263 int stat_reg;
264
265 spin_lock(&pcipcwd_private.io_lock);
266 outb_p(0xA5, pcipcwd_private.io_addr + 3);
267 udelay(1000);
268
269 outb_p(0xA5, pcipcwd_private.io_addr + 3);
270 udelay(1000);
271
272 stat_reg = inb_p(pcipcwd_private.io_addr + 2);
273 spin_unlock(&pcipcwd_private.io_lock);
274
Wim Van Sebroecka0800f62005-09-29 16:21:50 +0200275 if (!(stat_reg & WD_PCI_WDIS)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n");
277 return -1;
278 }
279
Wim Van Sebroeck195331d2005-09-29 16:22:30 +0200280 if (debug >= VERBOSE)
281 printk(KERN_DEBUG PFX "Watchdog stopped\n");
282
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 return 0;
284}
285
286static int pcipcwd_keepalive(void)
287{
288 /* Re-trigger watchdog by writing to port 0 */
Wim Van Sebroecka0800f62005-09-29 16:21:50 +0200289 outb_p(0x42, pcipcwd_private.io_addr); /* send out any data */
Wim Van Sebroeck195331d2005-09-29 16:22:30 +0200290
291 if (debug >= DEBUG)
292 printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n");
293
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 return 0;
295}
296
297static int pcipcwd_set_heartbeat(int t)
298{
299 int t_msb = t / 256;
300 int t_lsb = t % 256;
301
302 if ((t < 0x0001) || (t > 0xFFFF))
303 return -EINVAL;
304
305 /* Write new heartbeat to watchdog */
306 send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb);
307
308 heartbeat = t;
Wim Van Sebroeck195331d2005-09-29 16:22:30 +0200309 if (debug >= VERBOSE)
310 printk(KERN_DEBUG PFX "New heartbeat: %d\n",
311 heartbeat);
312
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 return 0;
314}
315
316static int pcipcwd_get_status(int *status)
317{
Wim Van Sebroecka0800f62005-09-29 16:21:50 +0200318 int control_status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
320 *status=0;
Wim Van Sebroecka0800f62005-09-29 16:21:50 +0200321 control_status = inb_p(pcipcwd_private.io_addr + 1);
322 if (control_status & WD_PCI_WTRP)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 *status |= WDIOF_CARDRESET;
Wim Van Sebroecka0800f62005-09-29 16:21:50 +0200324 if (control_status & WD_PCI_TTRP) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 *status |= WDIOF_OVERHEAT;
326 if (temp_panic)
327 panic(PFX "Temperature overheat trip!\n");
328 }
329
Wim Van Sebroeck195331d2005-09-29 16:22:30 +0200330 if (debug >= DEBUG)
331 printk(KERN_DEBUG PFX "Control Status #1: 0x%02x\n",
332 control_status);
333
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 return 0;
335}
336
337static int pcipcwd_clear_status(void)
338{
Wim Van Sebroecka0800f62005-09-29 16:21:50 +0200339 int control_status;
340 int msb;
341 int reset_counter;
342
Wim Van Sebroeck195331d2005-09-29 16:22:30 +0200343 if (debug >= VERBOSE)
344 printk(KERN_INFO PFX "clearing watchdog trip status & LED\n");
345
Wim Van Sebroecka0800f62005-09-29 16:21:50 +0200346 control_status = inb_p(pcipcwd_private.io_addr + 1);
347
Wim Van Sebroeck195331d2005-09-29 16:22:30 +0200348 if (debug >= DEBUG) {
349 printk(KERN_DEBUG PFX "status was: 0x%02x\n", control_status);
350 printk(KERN_DEBUG PFX "sending: 0x%02x\n",
351 (control_status & WD_PCI_R2DS) | WD_PCI_WTRP);
352 }
353
Wim Van Sebroecka0800f62005-09-29 16:21:50 +0200354 /* clear trip status & LED and keep mode of relay 2 */
355 outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP, pcipcwd_private.io_addr + 1);
356
357 /* clear reset counter */
358 msb=0;
359 reset_counter=0xff;
360 send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter);
361
Wim Van Sebroeck195331d2005-09-29 16:22:30 +0200362 if (debug >= DEBUG) {
363 printk(KERN_DEBUG PFX "reset count was: 0x%02x\n",
364 reset_counter);
365 }
366
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 return 0;
368}
369
370static int pcipcwd_get_temperature(int *temperature)
371{
372 *temperature = 0;
373 if (!pcipcwd_private.supports_temp)
374 return -ENODEV;
375
Wim Van Sebroecka0800f62005-09-29 16:21:50 +0200376 *temperature = inb_p(pcipcwd_private.io_addr);
377
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 /*
379 * Convert celsius to fahrenheit, since this was
380 * the decided 'standard' for this return value.
381 */
Wim Van Sebroecka0800f62005-09-29 16:21:50 +0200382 *temperature = (*temperature * 9 / 5) + 32;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
Wim Van Sebroeck195331d2005-09-29 16:22:30 +0200384 if (debug >= DEBUG) {
385 printk(KERN_DEBUG PFX "temperature is: %d F\n",
386 *temperature);
387 }
388
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 return 0;
390}
391
Wim Van Sebroeck58b519f2006-05-21 12:48:44 +0200392static int pcipcwd_get_timeleft(int *time_left)
393{
394 int msb;
395 int lsb;
396
397 /* Read the time that's left before rebooting */
398 /* Note: if the board is not yet armed then we will read 0xFFFF */
399 send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
400
401 *time_left = (msb << 8) + lsb;
402
403 if (debug >= VERBOSE)
404 printk(KERN_DEBUG PFX "Time left before next reboot: %d\n",
405 *time_left);
406
407 return 0;
408}
409
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410/*
411 * /dev/watchdog handling
412 */
413
414static ssize_t pcipcwd_write(struct file *file, const char __user *data,
Wim Van Sebroecka0800f62005-09-29 16:21:50 +0200415 size_t len, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416{
417 /* See if we got the magic character 'V' and reload the timer */
418 if (len) {
419 if (!nowayout) {
420 size_t i;
421
422 /* note: just in case someone wrote the magic character
423 * five months ago... */
424 expect_release = 0;
425
426 /* scan to see whether or not we got the magic character */
427 for (i = 0; i != len; i++) {
428 char c;
429 if(get_user(c, data+i))
430 return -EFAULT;
431 if (c == 'V')
432 expect_release = 42;
433 }
434 }
435
436 /* someone wrote to us, we should reload the timer */
437 pcipcwd_keepalive();
438 }
439 return len;
440}
441
442static int pcipcwd_ioctl(struct inode *inode, struct file *file,
443 unsigned int cmd, unsigned long arg)
444{
445 void __user *argp = (void __user *)arg;
446 int __user *p = argp;
447 static struct watchdog_info ident = {
448 .options = WDIOF_OVERHEAT |
449 WDIOF_CARDRESET |
450 WDIOF_KEEPALIVEPING |
451 WDIOF_SETTIMEOUT |
452 WDIOF_MAGICCLOSE,
453 .firmware_version = 1,
454 .identity = WATCHDOG_DRIVER_NAME,
455 };
456
457 switch (cmd) {
458 case WDIOC_GETSUPPORT:
459 return copy_to_user(argp, &ident,
460 sizeof (ident)) ? -EFAULT : 0;
461
462 case WDIOC_GETSTATUS:
463 {
464 int status;
465
466 pcipcwd_get_status(&status);
467
468 return put_user(status, p);
469 }
470
471 case WDIOC_GETBOOTSTATUS:
472 return put_user(pcipcwd_private.boot_status, p);
473
474 case WDIOC_GETTEMP:
475 {
476 int temperature;
477
478 if (pcipcwd_get_temperature(&temperature))
479 return -EFAULT;
480
481 return put_user(temperature, p);
482 }
483
484 case WDIOC_KEEPALIVE:
485 pcipcwd_keepalive();
486 return 0;
487
488 case WDIOC_SETOPTIONS:
489 {
490 int new_options, retval = -EINVAL;
491
492 if (get_user (new_options, p))
493 return -EFAULT;
494
495 if (new_options & WDIOS_DISABLECARD) {
Wim Van Sebroeckc315b7e82005-09-12 00:21:19 +0200496 if (pcipcwd_stop())
497 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 retval = 0;
499 }
500
501 if (new_options & WDIOS_ENABLECARD) {
Wim Van Sebroeckc315b7e82005-09-12 00:21:19 +0200502 if (pcipcwd_start())
503 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 retval = 0;
505 }
506
507 if (new_options & WDIOS_TEMPPANIC) {
508 temp_panic = 1;
509 retval = 0;
510 }
511
512 return retval;
513 }
514
515 case WDIOC_SETTIMEOUT:
516 {
517 int new_heartbeat;
518
519 if (get_user(new_heartbeat, p))
520 return -EFAULT;
521
522 if (pcipcwd_set_heartbeat(new_heartbeat))
523 return -EINVAL;
524
525 pcipcwd_keepalive();
526 /* Fall */
527 }
528
529 case WDIOC_GETTIMEOUT:
530 return put_user(heartbeat, p);
531
Wim Van Sebroeck58b519f2006-05-21 12:48:44 +0200532 case WDIOC_GETTIMELEFT:
533 {
534 int time_left;
535
536 if (pcipcwd_get_timeleft(&time_left))
537 return -EFAULT;
538
539 return put_user(time_left, p);
540 }
541
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 default:
Samuel Tardieu795b89d2006-09-09 17:34:31 +0200543 return -ENOTTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 }
545}
546
547static int pcipcwd_open(struct inode *inode, struct file *file)
548{
549 /* /dev/watchdog can only be opened once */
Wim Van Sebroecka0800f62005-09-29 16:21:50 +0200550 if (test_and_set_bit(0, &is_active)) {
Wim Van Sebroeck195331d2005-09-29 16:22:30 +0200551 if (debug >= VERBOSE)
552 printk(KERN_ERR PFX "Attempt to open already opened device.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 return -EBUSY;
Wim Van Sebroecka0800f62005-09-29 16:21:50 +0200554 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555
556 /* Activate */
557 pcipcwd_start();
558 pcipcwd_keepalive();
559 return nonseekable_open(inode, file);
560}
561
562static int pcipcwd_release(struct inode *inode, struct file *file)
563{
564 /*
565 * Shut off the timer.
566 */
567 if (expect_release == 42) {
568 pcipcwd_stop();
569 } else {
570 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
571 pcipcwd_keepalive();
572 }
573 expect_release = 0;
574 clear_bit(0, &is_active);
575 return 0;
576}
577
578/*
579 * /dev/temperature handling
580 */
581
582static ssize_t pcipcwd_temp_read(struct file *file, char __user *data,
583 size_t len, loff_t *ppos)
584{
585 int temperature;
586
587 if (pcipcwd_get_temperature(&temperature))
588 return -EFAULT;
589
590 if (copy_to_user (data, &temperature, 1))
591 return -EFAULT;
592
593 return 1;
594}
595
596static int pcipcwd_temp_open(struct inode *inode, struct file *file)
597{
598 if (!pcipcwd_private.supports_temp)
599 return -ENODEV;
600
601 return nonseekable_open(inode, file);
602}
603
604static int pcipcwd_temp_release(struct inode *inode, struct file *file)
605{
606 return 0;
607}
608
609/*
610 * Notify system
611 */
612
613static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
614{
615 if (code==SYS_DOWN || code==SYS_HALT) {
616 /* Turn the WDT off */
617 pcipcwd_stop();
618 }
619
620 return NOTIFY_DONE;
621}
622
623/*
624 * Kernel Interfaces
625 */
626
Arjan van de Ven62322d22006-07-03 00:24:21 -0700627static const struct file_operations pcipcwd_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 .owner = THIS_MODULE,
629 .llseek = no_llseek,
630 .write = pcipcwd_write,
631 .ioctl = pcipcwd_ioctl,
632 .open = pcipcwd_open,
633 .release = pcipcwd_release,
634};
635
636static struct miscdevice pcipcwd_miscdev = {
637 .minor = WATCHDOG_MINOR,
638 .name = "watchdog",
639 .fops = &pcipcwd_fops,
640};
641
Arjan van de Ven62322d22006-07-03 00:24:21 -0700642static const struct file_operations pcipcwd_temp_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 .owner = THIS_MODULE,
644 .llseek = no_llseek,
645 .read = pcipcwd_temp_read,
646 .open = pcipcwd_temp_open,
647 .release = pcipcwd_temp_release,
648};
649
650static struct miscdevice pcipcwd_temp_miscdev = {
651 .minor = TEMP_MINOR,
652 .name = "temperature",
653 .fops = &pcipcwd_temp_fops,
654};
655
656static struct notifier_block pcipcwd_notifier = {
657 .notifier_call = pcipcwd_notify_sys,
658};
659
660/*
661 * Init & exit routines
662 */
663
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664static int __devinit pcipcwd_card_init(struct pci_dev *pdev,
665 const struct pci_device_id *ent)
666{
667 int ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668
669 cards_found++;
670 if (cards_found == 1)
671 printk(KERN_INFO PFX DRIVER_VERSION);
672
673 if (cards_found > 1) {
674 printk(KERN_ERR PFX "This driver only supports 1 device\n");
675 return -ENODEV;
676 }
677
678 if (pci_enable_device(pdev)) {
679 printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
680 return -ENODEV;
681 }
682
683 if (pci_resource_start(pdev, 0) == 0x0000) {
684 printk(KERN_ERR PFX "No I/O-Address for card detected\n");
685 ret = -ENODEV;
686 goto err_out_disable_device;
687 }
688
689 pcipcwd_private.pdev = pdev;
690 pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
691
692 if (pci_request_regions(pdev, WATCHDOG_NAME)) {
693 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
694 (int) pcipcwd_private.io_addr);
695 ret = -EIO;
696 goto err_out_disable_device;
697 }
698
699 /* get the boot_status */
700 pcipcwd_get_status(&pcipcwd_private.boot_status);
701
702 /* clear the "card caused reboot" flag */
703 pcipcwd_clear_status();
704
705 /* disable card */
706 pcipcwd_stop();
707
708 /* Check whether or not the card supports the temperature device */
Wim Van Sebroecka0800f62005-09-29 16:21:50 +0200709 pcipcwd_check_temperature_support();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710
Wim Van Sebroecka0800f62005-09-29 16:21:50 +0200711 /* Show info about the card itself */
712 pcipcwd_show_card_info();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713
714 /* Check that the heartbeat value is within it's range ; if not reset to the default */
715 if (pcipcwd_set_heartbeat(heartbeat)) {
716 pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
717 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
718 WATCHDOG_HEARTBEAT);
719 }
720
721 ret = register_reboot_notifier(&pcipcwd_notifier);
722 if (ret != 0) {
723 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
724 ret);
725 goto err_out_release_region;
726 }
727
728 if (pcipcwd_private.supports_temp) {
729 ret = misc_register(&pcipcwd_temp_miscdev);
730 if (ret != 0) {
731 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
732 TEMP_MINOR, ret);
733 goto err_out_unregister_reboot;
734 }
735 }
736
737 ret = misc_register(&pcipcwd_miscdev);
738 if (ret != 0) {
739 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
740 WATCHDOG_MINOR, ret);
741 goto err_out_misc_deregister;
742 }
743
744 printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
745 heartbeat, nowayout);
746
747 return 0;
748
749err_out_misc_deregister:
750 if (pcipcwd_private.supports_temp)
751 misc_deregister(&pcipcwd_temp_miscdev);
752err_out_unregister_reboot:
753 unregister_reboot_notifier(&pcipcwd_notifier);
754err_out_release_region:
755 pci_release_regions(pdev);
756err_out_disable_device:
757 pci_disable_device(pdev);
758 return ret;
759}
760
761static void __devexit pcipcwd_card_exit(struct pci_dev *pdev)
762{
763 /* Stop the timer before we leave */
764 if (!nowayout)
765 pcipcwd_stop();
766
767 /* Deregister */
768 misc_deregister(&pcipcwd_miscdev);
769 if (pcipcwd_private.supports_temp)
770 misc_deregister(&pcipcwd_temp_miscdev);
771 unregister_reboot_notifier(&pcipcwd_notifier);
772 pci_release_regions(pdev);
773 pci_disable_device(pdev);
774 cards_found--;
775}
776
777static struct pci_device_id pcipcwd_pci_tbl[] = {
778 { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
779 PCI_ANY_ID, PCI_ANY_ID, },
780 { 0 }, /* End of list */
781};
782MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
783
784static struct pci_driver pcipcwd_driver = {
785 .name = WATCHDOG_NAME,
786 .id_table = pcipcwd_pci_tbl,
787 .probe = pcipcwd_card_init,
788 .remove = __devexit_p(pcipcwd_card_exit),
789};
790
791static int __init pcipcwd_init_module(void)
792{
Wim Van Sebroecka0800f62005-09-29 16:21:50 +0200793 spin_lock_init(&pcipcwd_private.io_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794
795 return pci_register_driver(&pcipcwd_driver);
796}
797
798static void __exit pcipcwd_cleanup_module(void)
799{
800 pci_unregister_driver(&pcipcwd_driver);
801}
802
803module_init(pcipcwd_init_module);
804module_exit(pcipcwd_cleanup_module);
805
806MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
807MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
808MODULE_LICENSE("GPL");
809MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
810MODULE_ALIAS_MISCDEV(TEMP_MINOR);