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HID: ThrustMaster FF driver is no longer experimental
[linux-2.6-block.git] / drivers / watchdog / pcwd_pci.c
CommitLineData
1da177e4
LT		 1/*
2 * Berkshire PCI-PC Watchdog Card Driver
3 *
39e3a055 4 * (c) Copyright 2003-2007 Wim Van Sebroeck <wim@iguana.be>.
1da177e4
LT		 5 *
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/*
58b519f3 24 * A bells and whistles driver is available from:
b3faed63
WVS		 25 * http://www.kernel.org/pub/linux/kernel/people/wim/pcwd/pcwd_pci/
26 *
1da177e4
LT		 27 * More info available at http://www.berkprod.com/ or http://www.pcwatchdog.com/
28 */
29
30/*
31 * Includes, defines, variables, module parameters, ...
32 */
33
c315b7e8
WVS		 34#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/... */
49
50#include <asm/uaccess.h> /* For copy_to_user/put_user/... */
51#include <asm/io.h> /* For inb/outb/... */
1da177e4
LT		 52
53/* Module and version information */
39e3a055 54#define WATCHDOG_VERSION "1.03"
bffda5c8 55#define WATCHDOG_DATE "21 Jan 2007"
1da177e4
LT		 56#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 */
a0800f6d
WVS		 74/* 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 */
1da177e4
LT		 87
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 */
a0800f6d
WVS		 93#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
1da177e4 98
39e3a055
WVS		 99/* Watchdog's Dip Switch heartbeat values */
100static const int heartbeat_tbl [] = {
101 5, /* OFF-OFF-OFF = 5 Sec */
102 10, /* OFF-OFF-ON = 10 Sec */
103 30, /* OFF-ON-OFF = 30 Sec */
104 60, /* OFF-ON-ON = 1 Min */
105 300, /* ON-OFF-OFF = 5 Min */
106 600, /* ON-OFF-ON = 10 Min */
107 1800, /* ON-ON-OFF = 30 Min */
108 3600, /* ON-ON-ON = 1 hour */
109};
110
1da177e4
LT		 111/* We can only use 1 card due to the /dev/watchdog restriction */
112static int cards_found;
113
114/* internal variables */
115static int temp_panic;
116static unsigned long is_active;
117static char expect_release;
a0800f6d
WVS		 118static struct { /* this is private data for each PCI-PC watchdog card */
119 int supports_temp; /* Wether or not the card has a temperature device */
120 int boot_status; /* The card's boot status */
121 unsigned long io_addr; /* The cards I/O address */
122 spinlock_t io_lock; /* the lock for io operations */
123 struct pci_dev *pdev; /* the PCI-device */
1da177e4
LT		 124} pcipcwd_private;
125
126/* module parameters */
195331d7
WVS		 127#define QUIET 0 /* Default */
128#define VERBOSE 1 /* Verbose */
129#define DEBUG 2 /* print fancy stuff too */
130static int debug = QUIET;
131module_param(debug, int, 0);
132MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
133
39e3a055 134#define WATCHDOG_HEARTBEAT 0 /* default heartbeat = delay-time from dip-switches */
1da177e4
LT		 135static int heartbeat = WATCHDOG_HEARTBEAT;
136module_param(heartbeat, int, 0);
39e3a055 137MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536 or 0=delay-time from dip-switches, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
1da177e4 138
4bfdf378 139static int nowayout = WATCHDOG_NOWAYOUT;
1da177e4 140module_param(nowayout, int, 0);
bffda5c8 141MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
1da177e4
LT		 142
143/*
144 * Internal functions
145 */
146
147static int send_command(int cmd, int *msb, int *lsb)
148{
149 int got_response, count;
150
195331d7
WVS		 151 if (debug >= DEBUG)
152 printk(KERN_DEBUG PFX "sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x\n",
153 cmd, *msb, *lsb);
154
1da177e4
LT		 155 spin_lock(&pcipcwd_private.io_lock);
156 /* If a command requires data it should be written first.
157 * Data for commands with 8 bits of data should be written to port 4.
158 * Commands with 16 bits of data, should be written as LSB to port 4
159 * and MSB to port 5.
160 * After the required data has been written then write the command to
161 * port 6. */
162 outb_p(*lsb, pcipcwd_private.io_addr + 4);
163 outb_p(*msb, pcipcwd_private.io_addr + 5);
164 outb_p(cmd, pcipcwd_private.io_addr + 6);
165
166 /* wait till the pci card processed the command, signaled by
167 * the WRSP bit in port 2 and give it a max. timeout of
168 * PCI_COMMAND_TIMEOUT to process */
a0800f6d 169 got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
1da177e4
LT		 170 for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response); count++) {
171 mdelay(1);
a0800f6d 172 got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
1da177e4
LT		 173 }
174
195331d7
WVS		 175 if (debug >= DEBUG) {
176 if (got_response) {
177 printk(KERN_DEBUG PFX "time to process command was: %d ms\n",
178 count);
179 } else {
180 printk(KERN_DEBUG PFX "card did not respond on command!\n");
181 }
182 }
183
1da177e4
LT		 184 if (got_response) {
185 /* read back response */
186 *lsb = inb_p(pcipcwd_private.io_addr + 4);
187 *msb = inb_p(pcipcwd_private.io_addr + 5);
188
189 /* clear WRSP bit */
190 inb_p(pcipcwd_private.io_addr + 6);
195331d7
WVS		 191
192 if (debug >= DEBUG)
193 printk(KERN_DEBUG PFX "received following data for cmd=0x%02x: msb=0x%02x lsb=0x%02x\n",
194 cmd, *msb, *lsb);
1da177e4 195 }
195331d7 196
1da177e4
LT		 197 spin_unlock(&pcipcwd_private.io_lock);
198
199 return got_response;
200}
201
a0800f6d
WVS		 202static inline void pcipcwd_check_temperature_support(void)
203{
204 if (inb_p(pcipcwd_private.io_addr) != 0xF0)
205 pcipcwd_private.supports_temp = 1;
206}
207
208static int pcipcwd_get_option_switches(void)
209{
210 int option_switches;
211
212 option_switches = inb_p(pcipcwd_private.io_addr + 3);
213 return option_switches;
214}
215
216static void pcipcwd_show_card_info(void)
217{
218 int got_fw_rev, fw_rev_major, fw_rev_minor;
219 char fw_ver_str[20]; /* The cards firmware version */
220 int option_switches;
221
222 got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor);
223 if (got_fw_rev) {
224 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
225 } else {
226 sprintf(fw_ver_str, "<card no answer>");
227 }
228
229 /* Get switch settings */
230 option_switches = pcipcwd_get_option_switches();
231
232 printk(KERN_INFO PFX "Found card at port 0x%04x (Firmware: %s) %s temp option\n",
233 (int) pcipcwd_private.io_addr, fw_ver_str,
234 (pcipcwd_private.supports_temp ? "with" : "without"));
235
236 printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
237 option_switches,
238 ((option_switches & 0x10) ? "ON" : "OFF"),
239 ((option_switches & 0x08) ? "ON" : "OFF"));
240
241 if (pcipcwd_private.boot_status & WDIOF_CARDRESET)
242 printk(KERN_INFO PFX "Previous reset was caused by the Watchdog card\n");
243
244 if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
245 printk(KERN_INFO PFX "Card sensed a CPU Overheat\n");
246
247 if (pcipcwd_private.boot_status == 0)
248 printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n");
249}
250
1da177e4
LT		 251static int pcipcwd_start(void)
252{
253 int stat_reg;
254
255 spin_lock(&pcipcwd_private.io_lock);
256 outb_p(0x00, pcipcwd_private.io_addr + 3);
257 udelay(1000);
258
259 stat_reg = inb_p(pcipcwd_private.io_addr + 2);
260 spin_unlock(&pcipcwd_private.io_lock);
261
a0800f6d 262 if (stat_reg & WD_PCI_WDIS) {
1da177e4
LT		 263 printk(KERN_ERR PFX "Card timer not enabled\n");
264 return -1;
265 }
266
195331d7
WVS		 267 if (debug >= VERBOSE)
268 printk(KERN_DEBUG PFX "Watchdog started\n");
269
1da177e4
LT		 270 return 0;
271}
272
273static int pcipcwd_stop(void)
274{
275 int stat_reg;
276
277 spin_lock(&pcipcwd_private.io_lock);
278 outb_p(0xA5, pcipcwd_private.io_addr + 3);
279 udelay(1000);
280
281 outb_p(0xA5, pcipcwd_private.io_addr + 3);
282 udelay(1000);
283
284 stat_reg = inb_p(pcipcwd_private.io_addr + 2);
285 spin_unlock(&pcipcwd_private.io_lock);
286
a0800f6d 287 if (!(stat_reg & WD_PCI_WDIS)) {
1da177e4
LT		 288 printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n");
289 return -1;
290 }
291
195331d7
WVS		 292 if (debug >= VERBOSE)
293 printk(KERN_DEBUG PFX "Watchdog stopped\n");
294
1da177e4
LT		 295 return 0;
296}
297
298static int pcipcwd_keepalive(void)
299{
300 /* Re-trigger watchdog by writing to port 0 */
045798b5 301 spin_lock(&pcipcwd_private.io_lock);
a0800f6d 302 outb_p(0x42, pcipcwd_private.io_addr); /* send out any data */
045798b5 303 spin_unlock(&pcipcwd_private.io_lock);
195331d7
WVS		 304
305 if (debug >= DEBUG)
306 printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n");
307
1da177e4
LT		 308 return 0;
309}
310
311static int pcipcwd_set_heartbeat(int t)
312{
313 int t_msb = t / 256;
314 int t_lsb = t % 256;
315
316 if ((t < 0x0001) || (t > 0xFFFF))
317 return -EINVAL;
318
319 /* Write new heartbeat to watchdog */
320 send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb);
321
322 heartbeat = t;
195331d7
WVS		 323 if (debug >= VERBOSE)
324 printk(KERN_DEBUG PFX "New heartbeat: %d\n",
325 heartbeat);
326
1da177e4
LT		 327 return 0;
328}
329
330static int pcipcwd_get_status(int *status)
331{
a0800f6d 332 int control_status;
1da177e4
LT		 333
334 *status=0;
a0800f6d
WVS		 335 control_status = inb_p(pcipcwd_private.io_addr + 1);
336 if (control_status & WD_PCI_WTRP)
1da177e4 337 *status |= WDIOF_CARDRESET;
a0800f6d 338 if (control_status & WD_PCI_TTRP) {
1da177e4
LT		 339 *status |= WDIOF_OVERHEAT;
340 if (temp_panic)
341 panic(PFX "Temperature overheat trip!\n");
342 }
343
195331d7
WVS		 344 if (debug >= DEBUG)
345 printk(KERN_DEBUG PFX "Control Status #1: 0x%02x\n",
346 control_status);
347
1da177e4
LT		 348 return 0;
349}
350
351static int pcipcwd_clear_status(void)
352{
a0800f6d
WVS		 353 int control_status;
354 int msb;
355 int reset_counter;
356
195331d7
WVS		 357 if (debug >= VERBOSE)
358 printk(KERN_INFO PFX "clearing watchdog trip status & LED\n");
359
a0800f6d
WVS		 360 control_status = inb_p(pcipcwd_private.io_addr + 1);
361
195331d7
WVS		 362 if (debug >= DEBUG) {
363 printk(KERN_DEBUG PFX "status was: 0x%02x\n", control_status);
364 printk(KERN_DEBUG PFX "sending: 0x%02x\n",
365 (control_status & WD_PCI_R2DS) | WD_PCI_WTRP);
366 }
367
a0800f6d
WVS		 368 /* clear trip status & LED and keep mode of relay 2 */
369 outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP, pcipcwd_private.io_addr + 1);
370
371 /* clear reset counter */
372 msb=0;
373 reset_counter=0xff;
374 send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter);
375
195331d7
WVS		 376 if (debug >= DEBUG) {
377 printk(KERN_DEBUG PFX "reset count was: 0x%02x\n",
378 reset_counter);
379 }
380
1da177e4
LT		 381 return 0;
382}
383
384static int pcipcwd_get_temperature(int *temperature)
385{
386 *temperature = 0;
387 if (!pcipcwd_private.supports_temp)
388 return -ENODEV;
389
045798b5 390 spin_lock(&pcipcwd_private.io_lock);
a0800f6d 391 *temperature = inb_p(pcipcwd_private.io_addr);
045798b5 392 spin_unlock(&pcipcwd_private.io_lock);
a0800f6d 393
1da177e4
LT		 394 /*
395 * Convert celsius to fahrenheit, since this was
396 * the decided 'standard' for this return value.
397 */
a0800f6d 398 *temperature = (*temperature * 9 / 5) + 32;
1da177e4 399
195331d7
WVS		 400 if (debug >= DEBUG) {
401 printk(KERN_DEBUG PFX "temperature is: %d F\n",
402 *temperature);
403 }
404
1da177e4
LT		 405 return 0;
406}
407
58b519f3
WVS		 408static int pcipcwd_get_timeleft(int *time_left)
409{
410 int msb;
411 int lsb;
412
413 /* Read the time that's left before rebooting */
414 /* Note: if the board is not yet armed then we will read 0xFFFF */
415 send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
416
417 *time_left = (msb << 8) + lsb;
418
419 if (debug >= VERBOSE)
420 printk(KERN_DEBUG PFX "Time left before next reboot: %d\n",
421 *time_left);
422
423 return 0;
424}
425
1da177e4
LT		 426/*
427 * /dev/watchdog handling
428 */
429
430static ssize_t pcipcwd_write(struct file *file, const char __user *data,
a0800f6d 431 size_t len, loff_t *ppos)
1da177e4
LT		 432{
433 /* See if we got the magic character 'V' and reload the timer */
434 if (len) {
435 if (!nowayout) {
436 size_t i;
437
438 /* note: just in case someone wrote the magic character
439 * five months ago... */
440 expect_release = 0;
441
442 /* scan to see whether or not we got the magic character */
443 for (i = 0; i != len; i++) {
444 char c;
445 if(get_user(c, data+i))
446 return -EFAULT;
447 if (c == 'V')
448 expect_release = 42;
449 }
450 }
451
452 /* someone wrote to us, we should reload the timer */
453 pcipcwd_keepalive();
454 }
455 return len;
456}
457
458static int pcipcwd_ioctl(struct inode *inode, struct file *file,
459 unsigned int cmd, unsigned long arg)
460{
461 void __user *argp = (void __user *)arg;
462 int __user *p = argp;
463 static struct watchdog_info ident = {
464 .options = WDIOF_OVERHEAT |
465 WDIOF_CARDRESET |
466 WDIOF_KEEPALIVEPING |
467 WDIOF_SETTIMEOUT |
468 WDIOF_MAGICCLOSE,
469 .firmware_version = 1,
470 .identity = WATCHDOG_DRIVER_NAME,
471 };
472
473 switch (cmd) {
474 case WDIOC_GETSUPPORT:
475 return copy_to_user(argp, &ident,
476 sizeof (ident)) ? -EFAULT : 0;
477
478 case WDIOC_GETSTATUS:
479 {
480 int status;
481
482 pcipcwd_get_status(&status);
483
484 return put_user(status, p);
485 }
486
487 case WDIOC_GETBOOTSTATUS:
488 return put_user(pcipcwd_private.boot_status, p);
489
490 case WDIOC_GETTEMP:
491 {
492 int temperature;
493
494 if (pcipcwd_get_temperature(&temperature))
495 return -EFAULT;
496
497 return put_user(temperature, p);
498 }
499
500 case WDIOC_KEEPALIVE:
501 pcipcwd_keepalive();
502 return 0;
503
504 case WDIOC_SETOPTIONS:
505 {
506 int new_options, retval = -EINVAL;
507
508 if (get_user (new_options, p))
509 return -EFAULT;
510
511 if (new_options & WDIOS_DISABLECARD) {
c315b7e8
WVS		 512 if (pcipcwd_stop())
513 return -EIO;
1da177e4
LT		 514 retval = 0;
515 }
516
517 if (new_options & WDIOS_ENABLECARD) {
c315b7e8
WVS		 518 if (pcipcwd_start())
519 return -EIO;
1da177e4
LT		 520 retval = 0;
521 }
522
523 if (new_options & WDIOS_TEMPPANIC) {
524 temp_panic = 1;
525 retval = 0;
526 }
527
528 return retval;
529 }
530
531 case WDIOC_SETTIMEOUT:
532 {
533 int new_heartbeat;
534
535 if (get_user(new_heartbeat, p))
536 return -EFAULT;
537
538 if (pcipcwd_set_heartbeat(new_heartbeat))
539 return -EINVAL;
540
541 pcipcwd_keepalive();
542 /* Fall */
543 }
544
545 case WDIOC_GETTIMEOUT:
546 return put_user(heartbeat, p);
547
58b519f3
WVS		 548 case WDIOC_GETTIMELEFT:
549 {
550 int time_left;
551
552 if (pcipcwd_get_timeleft(&time_left))
553 return -EFAULT;
554
555 return put_user(time_left, p);
556 }
557
1da177e4 558 default:
795b89d2 559 return -ENOTTY;
1da177e4
LT		 560 }
561}
562
563static int pcipcwd_open(struct inode *inode, struct file *file)
564{
565 /* /dev/watchdog can only be opened once */
a0800f6d 566 if (test_and_set_bit(0, &is_active)) {
195331d7
WVS		 567 if (debug >= VERBOSE)
568 printk(KERN_ERR PFX "Attempt to open already opened device.\n");
1da177e4 569 return -EBUSY;
a0800f6d 570 }
1da177e4
LT		 571
572 /* Activate */
573 pcipcwd_start();
574 pcipcwd_keepalive();
575 return nonseekable_open(inode, file);
576}
577
578static int pcipcwd_release(struct inode *inode, struct file *file)
579{
580 /*
581 * Shut off the timer.
582 */
583 if (expect_release == 42) {
584 pcipcwd_stop();
585 } else {
586 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
587 pcipcwd_keepalive();
588 }
589 expect_release = 0;
590 clear_bit(0, &is_active);
591 return 0;
592}
593
594/*
595 * /dev/temperature handling
596 */
597
598static ssize_t pcipcwd_temp_read(struct file *file, char __user *data,
599 size_t len, loff_t *ppos)
600{
601 int temperature;
602
603 if (pcipcwd_get_temperature(&temperature))
604 return -EFAULT;
605
606 if (copy_to_user (data, &temperature, 1))
607 return -EFAULT;
608
609 return 1;
610}
611
612static int pcipcwd_temp_open(struct inode *inode, struct file *file)
613{
614 if (!pcipcwd_private.supports_temp)
615 return -ENODEV;
616
617 return nonseekable_open(inode, file);
618}
619
620static int pcipcwd_temp_release(struct inode *inode, struct file *file)
621{
622 return 0;
623}
624
625/*
626 * Notify system
627 */
628
629static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
630{
631 if (code==SYS_DOWN || code==SYS_HALT) {
632 /* Turn the WDT off */
633 pcipcwd_stop();
634 }
635
636 return NOTIFY_DONE;
637}
638
639/*
640 * Kernel Interfaces
641 */
642
62322d25 643static const struct file_operations pcipcwd_fops = {
1da177e4
LT		 644 .owner = THIS_MODULE,
645 .llseek = no_llseek,
646 .write = pcipcwd_write,
647 .ioctl = pcipcwd_ioctl,
648 .open = pcipcwd_open,
649 .release = pcipcwd_release,
650};
651
652static struct miscdevice pcipcwd_miscdev = {
653 .minor = WATCHDOG_MINOR,
654 .name = "watchdog",
655 .fops = &pcipcwd_fops,
656};
657
62322d25 658static const struct file_operations pcipcwd_temp_fops = {
1da177e4
LT		 659 .owner = THIS_MODULE,
660 .llseek = no_llseek,
661 .read = pcipcwd_temp_read,
662 .open = pcipcwd_temp_open,
663 .release = pcipcwd_temp_release,
664};
665
666static struct miscdevice pcipcwd_temp_miscdev = {
667 .minor = TEMP_MINOR,
668 .name = "temperature",
669 .fops = &pcipcwd_temp_fops,
670};
671
672static struct notifier_block pcipcwd_notifier = {
673 .notifier_call = pcipcwd_notify_sys,
674};
675
676/*
677 * Init & exit routines
678 */
679
1da177e4
LT		 680static int __devinit pcipcwd_card_init(struct pci_dev *pdev,
681 const struct pci_device_id *ent)
682{
683 int ret = -EIO;
1da177e4
LT		 684
685 cards_found++;
686 if (cards_found == 1)
687 printk(KERN_INFO PFX DRIVER_VERSION);
688
689 if (cards_found > 1) {
690 printk(KERN_ERR PFX "This driver only supports 1 device\n");
691 return -ENODEV;
692 }
693
694 if (pci_enable_device(pdev)) {
695 printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
696 return -ENODEV;
697 }
698
699 if (pci_resource_start(pdev, 0) == 0x0000) {
700 printk(KERN_ERR PFX "No I/O-Address for card detected\n");
701 ret = -ENODEV;
702 goto err_out_disable_device;
703 }
704
705 pcipcwd_private.pdev = pdev;
706 pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
707
708 if (pci_request_regions(pdev, WATCHDOG_NAME)) {
709 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
710 (int) pcipcwd_private.io_addr);
711 ret = -EIO;
712 goto err_out_disable_device;
713 }
714
715 /* get the boot_status */
716 pcipcwd_get_status(&pcipcwd_private.boot_status);
717
718 /* clear the "card caused reboot" flag */
719 pcipcwd_clear_status();
720
721 /* disable card */
722 pcipcwd_stop();
723
724 /* Check whether or not the card supports the temperature device */
a0800f6d 725 pcipcwd_check_temperature_support();
1da177e4 726
a0800f6d
WVS		 727 /* Show info about the card itself */
728 pcipcwd_show_card_info();
1da177e4 729
39e3a055
WVS		 730 /* If heartbeat = 0 then we use the heartbeat from the dip-switches */
731 if (heartbeat == 0)
732 heartbeat = heartbeat_tbl[(pcipcwd_get_option_switches() & 0x07)];
733
1da177e4
LT		 734 /* Check that the heartbeat value is within it's range ; if not reset to the default */
735 if (pcipcwd_set_heartbeat(heartbeat)) {
736 pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
737 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
738 WATCHDOG_HEARTBEAT);
739 }
740
741 ret = register_reboot_notifier(&pcipcwd_notifier);
742 if (ret != 0) {
743 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
744 ret);
745 goto err_out_release_region;
746 }
747
748 if (pcipcwd_private.supports_temp) {
749 ret = misc_register(&pcipcwd_temp_miscdev);
750 if (ret != 0) {
751 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
752 TEMP_MINOR, ret);
753 goto err_out_unregister_reboot;
754 }
755 }
756
757 ret = misc_register(&pcipcwd_miscdev);
758 if (ret != 0) {
759 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
760 WATCHDOG_MINOR, ret);
761 goto err_out_misc_deregister;
762 }
763
764 printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
765 heartbeat, nowayout);
766
767 return 0;
768
769err_out_misc_deregister:
770 if (pcipcwd_private.supports_temp)
771 misc_deregister(&pcipcwd_temp_miscdev);
772err_out_unregister_reboot:
773 unregister_reboot_notifier(&pcipcwd_notifier);
774err_out_release_region:
775 pci_release_regions(pdev);
776err_out_disable_device:
777 pci_disable_device(pdev);
778 return ret;
779}
780
781static void __devexit pcipcwd_card_exit(struct pci_dev *pdev)
782{
783 /* Stop the timer before we leave */
784 if (!nowayout)
785 pcipcwd_stop();
786
787 /* Deregister */
788 misc_deregister(&pcipcwd_miscdev);
789 if (pcipcwd_private.supports_temp)
790 misc_deregister(&pcipcwd_temp_miscdev);
791 unregister_reboot_notifier(&pcipcwd_notifier);
792 pci_release_regions(pdev);
793 pci_disable_device(pdev);
794 cards_found--;
795}
796
797static struct pci_device_id pcipcwd_pci_tbl[] = {
798 { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
799 PCI_ANY_ID, PCI_ANY_ID, },
800 { 0 }, /* End of list */
801};
802MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
803
804static struct pci_driver pcipcwd_driver = {
805 .name = WATCHDOG_NAME,
806 .id_table = pcipcwd_pci_tbl,
807 .probe = pcipcwd_card_init,
808 .remove = __devexit_p(pcipcwd_card_exit),
809};
810
811static int __init pcipcwd_init_module(void)
812{
a0800f6d 813 spin_lock_init(&pcipcwd_private.io_lock);
1da177e4
LT		 814
815 return pci_register_driver(&pcipcwd_driver);
816}
817
818static void __exit pcipcwd_cleanup_module(void)
819{
820 pci_unregister_driver(&pcipcwd_driver);
045798b5
WVS		 821
822 printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
1da177e4
LT		 823}
824
825module_init(pcipcwd_init_module);
826module_exit(pcipcwd_cleanup_module);
827
828MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
829MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
830MODULE_LICENSE("GPL");
831MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
832MODULE_ALIAS_MISCDEV(TEMP_MINOR);
Linux 6.x block layer and io_uring tree(s)