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checkpatch: if should not continue a preceeding brace
[linux-2.6/mini2440.git] / drivers / watchdog / pcwd.c
blob9e1331a3b2157e5c7e746ab164209bc0fe77cbe7
1 /*
2 * PC Watchdog Driver
3 * by Ken Hollis (khollis@bitgate.com)
4 *
5 * Permission granted from Simon Machell (smachell@berkprod.com)
6 * Written for the Linux Kernel, and GPLed by Ken Hollis
7 *
8 * 960107 Added request_region routines, modulized the whole thing.
9 * 960108 Fixed end-of-file pointer (Thanks to Dan Hollis), added
10 * WD_TIMEOUT define.
11 * 960216 Added eof marker on the file, and changed verbose messages.
12 * 960716 Made functional and cosmetic changes to the source for
13 * inclusion in Linux 2.0.x kernels, thanks to Alan Cox.
14 * 960717 Removed read/seek routines, replaced with ioctl. Also, added
15 * check_region command due to Alan's suggestion.
16 * 960821 Made changes to compile in newer 2.0.x kernels. Added
17 * "cold reboot sense" entry.
18 * 960825 Made a few changes to code, deleted some defines and made
19 * typedefs to replace them. Made heartbeat reset only available
20 * via ioctl, and removed the write routine.
21 * 960828 Added new items for PC Watchdog Rev.C card.
22 * 960829 Changed around all of the IOCTLs, added new features,
23 * added watchdog disable/re-enable routines. Added firmware
24 * version reporting. Added read routine for temperature.
25 * Removed some extra defines, added an autodetect Revision
26 * routine.
27 * 961006 Revised some documentation, fixed some cosmetic bugs. Made
28 * drivers to panic the system if it's overheating at bootup.
29 * 961118 Changed some verbiage on some of the output, tidied up
30 * code bits, and added compatibility to 2.1.x.
31 * 970912 Enabled board on open and disable on close.
32 * 971107 Took account of recent VFS changes (broke read).
33 * 971210 Disable board on initialisation in case board already ticking.
34 * 971222 Changed open/close for temperature handling
35 * Michael Meskes <meskes@debian.org>.
36 * 980112 Used minor numbers from include/linux/miscdevice.h
37 * 990403 Clear reset status after reading control status register in
38 * pcwd_showprevstate(). [Marc Boucher <marc@mbsi.ca>]
39 * 990605 Made changes to code to support Firmware 1.22a, added
40 * fairly useless proc entry.
41 * 990610 removed said useless proc code for the merge <alan>
42 * 000403 Removed last traces of proc code. <davej>
43 * 011214 Added nowayout module option to override
44 * CONFIG_WATCHDOG_NOWAYOUT <Matt_Domsch@dell.com>
45 * Added timeout module option to override default
46 */
47
48 /*
49 * A bells and whistles driver is available from http://www.pcwd.de/
50 * More info available at http://www.berkprod.com/ or
51 * http://www.pcwatchdog.com/
52 */
53
54 #include <linux/module.h> /* For module specific items */
55 #include <linux/moduleparam.h> /* For new moduleparam's */
56 #include <linux/types.h> /* For standard types (like size_t) */
57 #include <linux/errno.h> /* For the -ENODEV/... values */
58 #include <linux/kernel.h> /* For printk/panic/... */
59 #include <linux/delay.h> /* For mdelay function */
60 #include <linux/timer.h> /* For timer related operations */
61 #include <linux/jiffies.h> /* For jiffies stuff */
62 #include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */
63 #include <linux/watchdog.h> /* For the watchdog specific items */
64 #include <linux/reboot.h> /* For kernel_power_off() */
65 #include <linux/init.h> /* For __init/__exit/... */
66 #include <linux/fs.h> /* For file operations */
67 #include <linux/isa.h> /* For isa devices */
68 #include <linux/ioport.h> /* For io-port access */
69 #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
70 #include <linux/uaccess.h> /* For copy_to_user/put_user/... */
71 #include <linux/io.h> /* For inb/outb/... */
72
73 /* Module and version information */
74 #define WATCHDOG_VERSION "1.20"
75 #define WATCHDOG_DATE "18 Feb 2007"
76 #define WATCHDOG_DRIVER_NAME "ISA-PC Watchdog"
77 #define WATCHDOG_NAME "pcwd"
78 #define PFX WATCHDOG_NAME ": "
79 #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION " (" WATCHDOG_DATE ")\n"
80 #define WD_VER WATCHDOG_VERSION " (" WATCHDOG_DATE ")"
81
82 /*
83 * It should be noted that PCWD_REVISION_B was removed because A and B
84 * are essentially the same types of card, with the exception that B
85 * has temperature reporting. Since I didn't receive a Rev.B card,
86 * the Rev.B card is not supported. (It's a good thing too, as they
87 * are no longer in production.)
88 */
89 #define PCWD_REVISION_A 1
90 #define PCWD_REVISION_C 2
91
92 /*
93 * These are the auto-probe addresses available.
94 *
95 * Revision A only uses ports 0x270 and 0x370. Revision C introduced 0x350.
96 * Revision A has an address range of 2 addresses, while Revision C has 4.
97 */
98 #define PCWD_ISA_NR_CARDS 3
99 static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 };
100
101 /*
102 * These are the defines that describe the control status bits for the
103 * PCI-PC Watchdog card.
104 */
105 /* Port 1 : Control Status #1 for the PC Watchdog card, revision A. */
106 #define WD_WDRST 0x01 /* Previously reset state */
107 #define WD_T110 0x02 /* Temperature overheat sense */
108 #define WD_HRTBT 0x04 /* Heartbeat sense */
109 #define WD_RLY2 0x08 /* External relay triggered */
110 #define WD_SRLY2 0x80 /* Software external relay triggered */
111 /* Port 1 : Control Status #1 for the PC Watchdog card, revision C. */
112 #define WD_REVC_WTRP 0x01 /* Watchdog Trip status */
113 #define WD_REVC_HRBT 0x02 /* Watchdog Heartbeat */
114 #define WD_REVC_TTRP 0x04 /* Temperature Trip status */
115 #define WD_REVC_RL2A 0x08 /* Relay 2 activated by
116 on-board processor */
117 #define WD_REVC_RL1A 0x10 /* Relay 1 active */
118 #define WD_REVC_R2DS 0x40 /* Relay 2 disable */
119 #define WD_REVC_RLY2 0x80 /* Relay 2 activated? */
120 /* Port 2 : Control Status #2 */
121 #define WD_WDIS 0x10 /* Watchdog Disabled */
122 #define WD_ENTP 0x20 /* Watchdog Enable Temperature Trip */
123 #define WD_SSEL 0x40 /* Watchdog Switch Select
124 (1:SW1 <-> 0:SW2) */
125 #define WD_WCMD 0x80 /* Watchdog Command Mode */
126
127 /* max. time we give an ISA watchdog card to process a command */
128 /* 500ms for each 4 bit response (according to spec.) */
129 #define ISA_COMMAND_TIMEOUT 1000
130
131 /* Watchdog's internal commands */
132 #define CMD_ISA_IDLE 0x00
133 #define CMD_ISA_VERSION_INTEGER 0x01
134 #define CMD_ISA_VERSION_TENTH 0x02
135 #define CMD_ISA_VERSION_HUNDRETH 0x03
136 #define CMD_ISA_VERSION_MINOR 0x04
137 #define CMD_ISA_SWITCH_SETTINGS 0x05
138 #define CMD_ISA_RESET_PC 0x06
139 #define CMD_ISA_ARM_0 0x07
140 #define CMD_ISA_ARM_30 0x08
141 #define CMD_ISA_ARM_60 0x09
142 #define CMD_ISA_DELAY_TIME_2SECS 0x0A
143 #define CMD_ISA_DELAY_TIME_4SECS 0x0B
144 #define CMD_ISA_DELAY_TIME_8SECS 0x0C
145 #define CMD_ISA_RESET_RELAYS 0x0D
146
147 /* Watchdog's Dip Switch heartbeat values */
148 static const int heartbeat_tbl[] = {
149 20, /* OFF-OFF-OFF = 20 Sec */
150 40, /* OFF-OFF-ON = 40 Sec */
151 60, /* OFF-ON-OFF = 1 Min */
152 300, /* OFF-ON-ON = 5 Min */
153 600, /* ON-OFF-OFF = 10 Min */
154 1800, /* ON-OFF-ON = 30 Min */
155 3600, /* ON-ON-OFF = 1 Hour */
156 7200, /* ON-ON-ON = 2 hour */
157 };
158
159 /*
160 * We are using an kernel timer to do the pinging of the watchdog
161 * every ~500ms. We try to set the internal heartbeat of the
162 * watchdog to 2 ms.
163 */
164
165 #define WDT_INTERVAL (HZ/2+1)
166
167 /* We can only use 1 card due to the /dev/watchdog restriction */
168 static int cards_found;
169
170 /* internal variables */
171 static unsigned long open_allowed;
172 static char expect_close;
173 static int temp_panic;
174
175 /* this is private data for each ISA-PC watchdog card */
176 static struct {
177 char fw_ver_str[6]; /* The cards firmware version */
178 int revision; /* The card's revision */
179 int supports_temp; /* Whether or not the card has
180 a temperature device */
181 int command_mode; /* Whether or not the card is in
182 command mode */
183 int boot_status; /* The card's boot status */
184 int io_addr; /* The cards I/O address */
185 spinlock_t io_lock; /* the lock for io operations */
186 struct timer_list timer; /* The timer that pings the watchdog */
187 unsigned long next_heartbeat; /* the next_heartbeat for the timer */
188 } pcwd_private;
189
190 /* module parameters */
191 #define QUIET 0 /* Default */
192 #define VERBOSE 1 /* Verbose */
193 #define DEBUG 2 /* print fancy stuff too */
194 static int debug = QUIET;
195 module_param(debug, int, 0);
196 MODULE_PARM_DESC(debug,
197 "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
198
199 /* default heartbeat = delay-time from dip-switches */
200 #define WATCHDOG_HEARTBEAT 0
201 static int heartbeat = WATCHDOG_HEARTBEAT;
202 module_param(heartbeat, int, 0);
203 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (2 <= heartbeat <= 7200 or 0=delay-time from dip-switches, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
204
205 static int nowayout = WATCHDOG_NOWAYOUT;
206 module_param(nowayout, int, 0);
207 MODULE_PARM_DESC(nowayout,
208 "Watchdog cannot be stopped once started (default="
209 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
210
211 /*
212 * Internal functions
213 */
214
215 static int send_isa_command(int cmd)
216 {
217 int i;
218 int control_status;
219 int port0, last_port0; /* Double read for stabilising */
220
221 if (debug >= DEBUG)
222 printk(KERN_DEBUG PFX "sending following data cmd=0x%02x\n",
223 cmd);
224
225 /* The WCMD bit must be 1 and the command is only 4 bits in size */
226 control_status = (cmd & 0x0F) | WD_WCMD;
227 outb_p(control_status, pcwd_private.io_addr + 2);
228 udelay(ISA_COMMAND_TIMEOUT);
229
230 port0 = inb_p(pcwd_private.io_addr);
231 for (i = 0; i < 25; ++i) {
232 last_port0 = port0;
233 port0 = inb_p(pcwd_private.io_addr);
234
235 if (port0 == last_port0)
236 break; /* Data is stable */
237
238 udelay(250);
239 }
240
241 if (debug >= DEBUG)
242 printk(KERN_DEBUG PFX "received following data for cmd=0x%02x: port0=0x%02x last_port0=0x%02x\n",
243 cmd, port0, last_port0);
244
245 return port0;
246 }
247
248 static int set_command_mode(void)
249 {
250 int i, found = 0, count = 0;
251
252 /* Set the card into command mode */
253 spin_lock(&pcwd_private.io_lock);
254 while ((!found) && (count < 3)) {
255 i = send_isa_command(CMD_ISA_IDLE);
256
257 if (i == 0x00)
258 found = 1;
259 else if (i == 0xF3) {
260 /* Card does not like what we've done to it */
261 outb_p(0x00, pcwd_private.io_addr + 2);
262 udelay(1200); /* Spec says wait 1ms */
263 outb_p(0x00, pcwd_private.io_addr + 2);
264 udelay(ISA_COMMAND_TIMEOUT);
265 }
266 count++;
267 }
268 spin_unlock(&pcwd_private.io_lock);
269 pcwd_private.command_mode = found;
270
271 if (debug >= DEBUG)
272 printk(KERN_DEBUG PFX "command_mode=%d\n",
273 pcwd_private.command_mode);
274
275 return found;
276 }
277
278 static void unset_command_mode(void)
279 {
280 /* Set the card into normal mode */
281 spin_lock(&pcwd_private.io_lock);
282 outb_p(0x00, pcwd_private.io_addr + 2);
283 udelay(ISA_COMMAND_TIMEOUT);
284 spin_unlock(&pcwd_private.io_lock);
285
286 pcwd_private.command_mode = 0;
287
288 if (debug >= DEBUG)
289 printk(KERN_DEBUG PFX "command_mode=%d\n",
290 pcwd_private.command_mode);
291 }
292
293 static inline void pcwd_check_temperature_support(void)
294 {
295 if (inb(pcwd_private.io_addr) != 0xF0)
296 pcwd_private.supports_temp = 1;
297 }
298
299 static inline void pcwd_get_firmware(void)
300 {
301 int one, ten, hund, minor;
302
303 strcpy(pcwd_private.fw_ver_str, "ERROR");
304
305 if (set_command_mode()) {
306 one = send_isa_command(CMD_ISA_VERSION_INTEGER);
307 ten = send_isa_command(CMD_ISA_VERSION_TENTH);
308 hund = send_isa_command(CMD_ISA_VERSION_HUNDRETH);
309 minor = send_isa_command(CMD_ISA_VERSION_MINOR);
310 sprintf(pcwd_private.fw_ver_str, "%c.%c%c%c",
311 one, ten, hund, minor);
312 }
313 unset_command_mode();
314
315 return;
316 }
317
318 static inline int pcwd_get_option_switches(void)
319 {
320 int option_switches = 0;
321
322 if (set_command_mode()) {
323 /* Get switch settings */
324 option_switches = send_isa_command(CMD_ISA_SWITCH_SETTINGS);
325 }
326
327 unset_command_mode();
328 return option_switches;
329 }
330
331 static void pcwd_show_card_info(void)
332 {
333 int option_switches;
334
335 /* Get some extra info from the hardware (in command/debug/diag mode) */
336 if (pcwd_private.revision == PCWD_REVISION_A)
337 printk(KERN_INFO PFX
338 "ISA-PC Watchdog (REV.A) detected at port 0x%04x\n",
339 pcwd_private.io_addr);
340 else if (pcwd_private.revision == PCWD_REVISION_C) {
341 pcwd_get_firmware();
342 printk(KERN_INFO PFX "ISA-PC Watchdog (REV.C) detected at port 0x%04x (Firmware version: %s)\n",
343 pcwd_private.io_addr, pcwd_private.fw_ver_str);
344 option_switches = pcwd_get_option_switches();
345 printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
346 option_switches,
347 ((option_switches & 0x10) ? "ON" : "OFF"),
348 ((option_switches & 0x08) ? "ON" : "OFF"));
349
350 /* Reprogram internal heartbeat to 2 seconds */
351 if (set_command_mode()) {
352 send_isa_command(CMD_ISA_DELAY_TIME_2SECS);
353 unset_command_mode();
354 }
355 }
356
357 if (pcwd_private.supports_temp)
358 printk(KERN_INFO PFX "Temperature Option Detected\n");
359
360 if (pcwd_private.boot_status & WDIOF_CARDRESET)
361 printk(KERN_INFO PFX "Previous reboot was caused by the card\n");
362
363 if (pcwd_private.boot_status & WDIOF_OVERHEAT) {
364 printk(KERN_EMERG PFX
365 "Card senses a CPU Overheat. Panicking!\n");
366 printk(KERN_EMERG PFX
367 "CPU Overheat\n");
368 }
369
370 if (pcwd_private.boot_status == 0)
371 printk(KERN_INFO PFX
372 "No previous trip detected - Cold boot or reset\n");
373 }
374
375 static void pcwd_timer_ping(unsigned long data)
376 {
377 int wdrst_stat;
378
379 /* If we got a heartbeat pulse within the WDT_INTERVAL
380 * we agree to ping the WDT */
381 if (time_before(jiffies, pcwd_private.next_heartbeat)) {
382 /* Ping the watchdog */
383 spin_lock(&pcwd_private.io_lock);
384 if (pcwd_private.revision == PCWD_REVISION_A) {
385 /* Rev A cards are reset by setting the
386 WD_WDRST bit in register 1 */
387 wdrst_stat = inb_p(pcwd_private.io_addr);
388 wdrst_stat &= 0x0F;
389 wdrst_stat |= WD_WDRST;
390
391 outb_p(wdrst_stat, pcwd_private.io_addr + 1);
392 } else {
393 /* Re-trigger watchdog by writing to port 0 */
394 outb_p(0x00, pcwd_private.io_addr);
395 }
396
397 /* Re-set the timer interval */
398 mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL);
399
400 spin_unlock(&pcwd_private.io_lock);
401 } else {
402 printk(KERN_WARNING PFX
403 "Heartbeat lost! Will not ping the watchdog\n");
404 }
405 }
406
407 static int pcwd_start(void)
408 {
409 int stat_reg;
410
411 pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ);
412
413 /* Start the timer */
414 mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL);
415
416 /* Enable the port */
417 if (pcwd_private.revision == PCWD_REVISION_C) {
418 spin_lock(&pcwd_private.io_lock);
419 outb_p(0x00, pcwd_private.io_addr + 3);
420 udelay(ISA_COMMAND_TIMEOUT);
421 stat_reg = inb_p(pcwd_private.io_addr + 2);
422 spin_unlock(&pcwd_private.io_lock);
423 if (stat_reg & WD_WDIS) {
424 printk(KERN_INFO PFX "Could not start watchdog\n");
425 return -EIO;
426 }
427 }
428
429 if (debug >= VERBOSE)
430 printk(KERN_DEBUG PFX "Watchdog started\n");
431
432 return 0;
433 }
434
435 static int pcwd_stop(void)
436 {
437 int stat_reg;
438
439 /* Stop the timer */
440 del_timer(&pcwd_private.timer);
441
442 /* Disable the board */
443 if (pcwd_private.revision == PCWD_REVISION_C) {
444 spin_lock(&pcwd_private.io_lock);
445 outb_p(0xA5, pcwd_private.io_addr + 3);
446 udelay(ISA_COMMAND_TIMEOUT);
447 outb_p(0xA5, pcwd_private.io_addr + 3);
448 udelay(ISA_COMMAND_TIMEOUT);
449 stat_reg = inb_p(pcwd_private.io_addr + 2);
450 spin_unlock(&pcwd_private.io_lock);
451 if ((stat_reg & WD_WDIS) == 0) {
452 printk(KERN_INFO PFX "Could not stop watchdog\n");
453 return -EIO;
454 }
455 }
456
457 if (debug >= VERBOSE)
458 printk(KERN_DEBUG PFX "Watchdog stopped\n");
459
460 return 0;
461 }
462
463 static int pcwd_keepalive(void)
464 {
465 /* user land ping */
466 pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ);
467
468 if (debug >= DEBUG)
469 printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n");
470
471 return 0;
472 }
473
474 static int pcwd_set_heartbeat(int t)
475 {
476 if (t < 2 || t > 7200) /* arbitrary upper limit */
477 return -EINVAL;
478
479 heartbeat = t;
480
481 if (debug >= VERBOSE)
482 printk(KERN_DEBUG PFX "New heartbeat: %d\n",
483 heartbeat);
484
485 return 0;
486 }
487
488 static int pcwd_get_status(int *status)
489 {
490 int control_status;
491
492 *status = 0;
493 spin_lock(&pcwd_private.io_lock);
494 if (pcwd_private.revision == PCWD_REVISION_A)
495 /* Rev A cards return status information from
496 * the base register, which is used for the
497 * temperature in other cards. */
498 control_status = inb(pcwd_private.io_addr);
499 else {
500 /* Rev C cards return card status in the base
501 * address + 1 register. And use different bits
502 * to indicate a card initiated reset, and an
503 * over-temperature condition. And the reboot
504 * status can be reset. */
505 control_status = inb(pcwd_private.io_addr + 1);
506 }
507 spin_unlock(&pcwd_private.io_lock);
508
509 if (pcwd_private.revision == PCWD_REVISION_A) {
510 if (control_status & WD_WDRST)
511 *status |= WDIOF_CARDRESET;
512
513 if (control_status & WD_T110) {
514 *status |= WDIOF_OVERHEAT;
515 if (temp_panic) {
516 printk(KERN_INFO PFX
517 "Temperature overheat trip!\n");
518 kernel_power_off();
519 }
520 }
521 } else {
522 if (control_status & WD_REVC_WTRP)
523 *status |= WDIOF_CARDRESET;
524
525 if (control_status & WD_REVC_TTRP) {
526 *status |= WDIOF_OVERHEAT;
527 if (temp_panic) {
528 printk(KERN_INFO PFX
529 "Temperature overheat trip!\n");
530 kernel_power_off();
531 }
532 }
533 }
534
535 return 0;
536 }
537
538 static int pcwd_clear_status(void)
539 {
540 int control_status;
541
542 if (pcwd_private.revision == PCWD_REVISION_C) {
543 spin_lock(&pcwd_private.io_lock);
544
545 if (debug >= VERBOSE)
546 printk(KERN_INFO PFX
547 "clearing watchdog trip status\n");
548
549 control_status = inb_p(pcwd_private.io_addr + 1);
550
551 if (debug >= DEBUG) {
552 printk(KERN_DEBUG PFX "status was: 0x%02x\n",
553 control_status);
554 printk(KERN_DEBUG PFX "sending: 0x%02x\n",
555 (control_status & WD_REVC_R2DS));
556 }
557
558 /* clear reset status & Keep Relay 2 disable state as it is */
559 outb_p((control_status & WD_REVC_R2DS),
560 pcwd_private.io_addr + 1);
561
562 spin_unlock(&pcwd_private.io_lock);
563 }
564 return 0;
565 }
566
567 static int pcwd_get_temperature(int *temperature)
568 {
569 /* check that port 0 gives temperature info and no command results */
570 if (pcwd_private.command_mode)
571 return -1;
572
573 *temperature = 0;
574 if (!pcwd_private.supports_temp)
575 return -ENODEV;
576
577 /*
578 * Convert celsius to fahrenheit, since this was
579 * the decided 'standard' for this return value.
580 */
581 spin_lock(&pcwd_private.io_lock);
582 *temperature = ((inb(pcwd_private.io_addr)) * 9 / 5) + 32;
583 spin_unlock(&pcwd_private.io_lock);
584
585 if (debug >= DEBUG) {
586 printk(KERN_DEBUG PFX "temperature is: %d F\n",
587 *temperature);
588 }
589
590 return 0;
591 }
592
593 /*
594 * /dev/watchdog handling
595 */
596
597 static long pcwd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
598 {
599 int rv;
600 int status;
601 int temperature;
602 int new_heartbeat;
603 int __user *argp = (int __user *)arg;
604 static struct watchdog_info ident = {
605 .options = WDIOF_OVERHEAT |
606 WDIOF_CARDRESET |
607 WDIOF_KEEPALIVEPING |
608 WDIOF_SETTIMEOUT |
609 WDIOF_MAGICCLOSE,
610 .firmware_version = 1,
611 .identity = "PCWD",
612 };
613
614 switch (cmd) {
615 case WDIOC_GETSUPPORT:
616 if (copy_to_user(argp, &ident, sizeof(ident)))
617 return -EFAULT;
618 return 0;
619
620 case WDIOC_GETSTATUS:
621 pcwd_get_status(&status);
622 return put_user(status, argp);
623
624 case WDIOC_GETBOOTSTATUS:
625 return put_user(pcwd_private.boot_status, argp);
626
627 case WDIOC_GETTEMP:
628 if (pcwd_get_temperature(&temperature))
629 return -EFAULT;
630
631 return put_user(temperature, argp);
632
633 case WDIOC_SETOPTIONS:
634 if (pcwd_private.revision == PCWD_REVISION_C) {
635 if (get_user(rv, argp))
636 return -EFAULT;
637
638 if (rv & WDIOS_DISABLECARD) {
639 status = pcwd_stop();
640 if (status < 0)
641 return status;
642 }
643 if (rv & WDIOS_ENABLECARD) {
644 status = pcwd_start();
645 if (status < 0)
646 return status;
647 }
648 if (rv & WDIOS_TEMPPANIC)
649 temp_panic = 1;
650 }
651 return -EINVAL;
652
653 case WDIOC_KEEPALIVE:
654 pcwd_keepalive();
655 return 0;
656
657 case WDIOC_SETTIMEOUT:
658 if (get_user(new_heartbeat, argp))
659 return -EFAULT;
660
661 if (pcwd_set_heartbeat(new_heartbeat))
662 return -EINVAL;
663
664 pcwd_keepalive();
665 /* Fall */
666
667 case WDIOC_GETTIMEOUT:
668 return put_user(heartbeat, argp);
669
670 default:
671 return -ENOTTY;
672 }
673
674 return 0;
675 }
676
677 static ssize_t pcwd_write(struct file *file, const char __user *buf, size_t len,
678 loff_t *ppos)
679 {
680 if (len) {
681 if (!nowayout) {
682 size_t i;
683
684 /* In case it was set long ago */
685 expect_close = 0;
686
687 for (i = 0; i != len; i++) {
688 char c;
689
690 if (get_user(c, buf + i))
691 return -EFAULT;
692 if (c == 'V')
693 expect_close = 42;
694 }
695 }
696 pcwd_keepalive();
697 }
698 return len;
699 }
700
701 static int pcwd_open(struct inode *inode, struct file *file)
702 {
703 if (test_and_set_bit(0, &open_allowed))
704 return -EBUSY;
705 if (nowayout)
706 __module_get(THIS_MODULE);
707 /* Activate */
708 pcwd_start();
709 pcwd_keepalive();
710 return nonseekable_open(inode, file);
711 }
712
713 static int pcwd_close(struct inode *inode, struct file *file)
714 {
715 if (expect_close == 42)
716 pcwd_stop();
717 else {
718 printk(KERN_CRIT PFX
719 "Unexpected close, not stopping watchdog!\n");
720 pcwd_keepalive();
721 }
722 expect_close = 0;
723 clear_bit(0, &open_allowed);
724 return 0;
725 }
726
727 /*
728 * /dev/temperature handling
729 */
730
731 static ssize_t pcwd_temp_read(struct file *file, char __user *buf, size_t count,
732 loff_t *ppos)
733 {
734 int temperature;
735
736 if (pcwd_get_temperature(&temperature))
737 return -EFAULT;
738
739 if (copy_to_user(buf, &temperature, 1))
740 return -EFAULT;
741
742 return 1;
743 }
744
745 static int pcwd_temp_open(struct inode *inode, struct file *file)
746 {
747 if (!pcwd_private.supports_temp)
748 return -ENODEV;
749
750 return nonseekable_open(inode, file);
751 }
752
753 static int pcwd_temp_close(struct inode *inode, struct file *file)
754 {
755 return 0;
756 }
757
758 /*
759 * Kernel Interfaces
760 */
761
762 static const struct file_operations pcwd_fops = {
763 .owner = THIS_MODULE,
764 .llseek = no_llseek,
765 .write = pcwd_write,
766 .unlocked_ioctl = pcwd_ioctl,
767 .open = pcwd_open,
768 .release = pcwd_close,
769 };
770
771 static struct miscdevice pcwd_miscdev = {
772 .minor = WATCHDOG_MINOR,
773 .name = "watchdog",
774 .fops = &pcwd_fops,
775 };
776
777 static const struct file_operations pcwd_temp_fops = {
778 .owner = THIS_MODULE,
779 .llseek = no_llseek,
780 .read = pcwd_temp_read,
781 .open = pcwd_temp_open,
782 .release = pcwd_temp_close,
783 };
784
785 static struct miscdevice temp_miscdev = {
786 .minor = TEMP_MINOR,
787 .name = "temperature",
788 .fops = &pcwd_temp_fops,
789 };
790
791 /*
792 * Init & exit routines
793 */
794
795 static inline int get_revision(void)
796 {
797 int r = PCWD_REVISION_C;
798
799 spin_lock(&pcwd_private.io_lock);
800 /* REV A cards use only 2 io ports; test
801 * presumes a floating bus reads as 0xff. */
802 if ((inb(pcwd_private.io_addr + 2) == 0xFF) ||
803 (inb(pcwd_private.io_addr + 3) == 0xFF))
804 r = PCWD_REVISION_A;
805 spin_unlock(&pcwd_private.io_lock);
806
807 return r;
808 }
809
810 /*
811 * The ISA cards have a heartbeat bit in one of the registers, which
812 * register is card dependent. The heartbeat bit is monitored, and if
813 * found, is considered proof that a Berkshire card has been found.
814 * The initial rate is once per second at board start up, then twice
815 * per second for normal operation.
816 */
817 static int __devinit pcwd_isa_match(struct device *dev, unsigned int id)
818 {
819 int base_addr = pcwd_ioports[id];
820 int port0, last_port0; /* Reg 0, in case it's REV A */
821 int port1, last_port1; /* Register 1 for REV C cards */
822 int i;
823 int retval;
824
825 if (debug >= DEBUG)
826 printk(KERN_DEBUG PFX "pcwd_isa_match id=%d\n",
827 id);
828
829 if (!request_region(base_addr, 4, "PCWD")) {
830 printk(KERN_INFO PFX "Port 0x%04x unavailable\n", base_addr);
831 return 0;
832 }
833
834 retval = 0;
835
836 port0 = inb_p(base_addr); /* For REV A boards */
837 port1 = inb_p(base_addr + 1); /* For REV C boards */
838 if (port0 != 0xff || port1 != 0xff) {
839 /* Not an 'ff' from a floating bus, so must be a card! */
840 for (i = 0; i < 4; ++i) {
841
842 msleep(500);
843
844 last_port0 = port0;
845 last_port1 = port1;
846
847 port0 = inb_p(base_addr);
848 port1 = inb_p(base_addr + 1);
849
850 /* Has either hearbeat bit changed? */
851 if ((port0 ^ last_port0) & WD_HRTBT ||
852 (port1 ^ last_port1) & WD_REVC_HRBT) {
853 retval = 1;
854 break;
855 }
856 }
857 }
858 release_region(base_addr, 4);
859
860 return retval;
861 }
862
863 static int __devinit pcwd_isa_probe(struct device *dev, unsigned int id)
864 {
865 int ret;
866
867 if (debug >= DEBUG)
868 printk(KERN_DEBUG PFX "pcwd_isa_probe id=%d\n",
869 id);
870
871 cards_found++;
872 if (cards_found == 1)
873 printk(KERN_INFO PFX "v%s Ken Hollis (kenji@bitgate.com)\n",
874 WD_VER);
875
876 if (cards_found > 1) {
877 printk(KERN_ERR PFX "This driver only supports 1 device\n");
878 return -ENODEV;
879 }
880
881 if (pcwd_ioports[id] == 0x0000) {
882 printk(KERN_ERR PFX "No I/O-Address for card detected\n");
883 return -ENODEV;
884 }
885 pcwd_private.io_addr = pcwd_ioports[id];
886
887 spin_lock_init(&pcwd_private.io_lock);
888
889 /* Check card's revision */
890 pcwd_private.revision = get_revision();
891
892 if (!request_region(pcwd_private.io_addr,
893 (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) {
894 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
895 pcwd_private.io_addr);
896 ret = -EIO;
897 goto error_request_region;
898 }
899
900 /* Initial variables */
901 pcwd_private.supports_temp = 0;
902 temp_panic = 0;
903 pcwd_private.boot_status = 0x0000;
904
905 /* get the boot_status */
906 pcwd_get_status(&pcwd_private.boot_status);
907
908 /* clear the "card caused reboot" flag */
909 pcwd_clear_status();
910
911 setup_timer(&pcwd_private.timer, pcwd_timer_ping, 0);
912
913 /* Disable the board */
914 pcwd_stop();
915
916 /* Check whether or not the card supports the temperature device */
917 pcwd_check_temperature_support();
918
919 /* Show info about the card itself */
920 pcwd_show_card_info();
921
922 /* If heartbeat = 0 then we use the heartbeat from the dip-switches */
923 if (heartbeat == 0)
924 heartbeat = heartbeat_tbl[(pcwd_get_option_switches() & 0x07)];
925
926 /* Check that the heartbeat value is within it's range;
927 if not reset to the default */
928 if (pcwd_set_heartbeat(heartbeat)) {
929 pcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
930 printk(KERN_INFO PFX
931 "heartbeat value must be 2 <= heartbeat <= 7200, using %d\n",
932 WATCHDOG_HEARTBEAT);
933 }
934
935 if (pcwd_private.supports_temp) {
936 ret = misc_register(&temp_miscdev);
937 if (ret) {
938 printk(KERN_ERR PFX
939 "cannot register miscdev on minor=%d (err=%d)\n",
940 TEMP_MINOR, ret);
941 goto error_misc_register_temp;
942 }
943 }
944
945 ret = misc_register(&pcwd_miscdev);
946 if (ret) {
947 printk(KERN_ERR PFX
948 "cannot register miscdev on minor=%d (err=%d)\n",
949 WATCHDOG_MINOR, ret);
950 goto error_misc_register_watchdog;
951 }
952
953 printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
954 heartbeat, nowayout);
955
956 return 0;
957
958 error_misc_register_watchdog:
959 if (pcwd_private.supports_temp)
960 misc_deregister(&temp_miscdev);
961 error_misc_register_temp:
962 release_region(pcwd_private.io_addr,
963 (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4);
964 error_request_region:
965 pcwd_private.io_addr = 0x0000;
966 cards_found--;
967 return ret;
968 }
969
970 static int __devexit pcwd_isa_remove(struct device *dev, unsigned int id)
971 {
972 if (debug >= DEBUG)
973 printk(KERN_DEBUG PFX "pcwd_isa_remove id=%d\n",
974 id);
975
976 if (!pcwd_private.io_addr)
977 return 1;
978
979 /* Disable the board */
980 if (!nowayout)
981 pcwd_stop();
982
983 /* Deregister */
984 misc_deregister(&pcwd_miscdev);
985 if (pcwd_private.supports_temp)
986 misc_deregister(&temp_miscdev);
987 release_region(pcwd_private.io_addr,
988 (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4);
989 pcwd_private.io_addr = 0x0000;
990 cards_found--;
991
992 return 0;
993 }
994
995 static void pcwd_isa_shutdown(struct device *dev, unsigned int id)
996 {
997 if (debug >= DEBUG)
998 printk(KERN_DEBUG PFX "pcwd_isa_shutdown id=%d\n",
999 id);
1000
1001 pcwd_stop();
1002 }
1003
1004 static struct isa_driver pcwd_isa_driver = {
1005 .match = pcwd_isa_match,
1006 .probe = pcwd_isa_probe,
1007 .remove = __devexit_p(pcwd_isa_remove),
1008 .shutdown = pcwd_isa_shutdown,
1009 .driver = {
1010 .owner = THIS_MODULE,
1011 .name = WATCHDOG_NAME,
1012 },
1013 };
1014
1015 static int __init pcwd_init_module(void)
1016 {
1017 return isa_register_driver(&pcwd_isa_driver, PCWD_ISA_NR_CARDS);
1018 }
1019
1020 static void __exit pcwd_cleanup_module(void)
1021 {
1022 isa_unregister_driver(&pcwd_isa_driver);
1023 printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
1024 }
1025
1026 module_init(pcwd_init_module);
1027 module_exit(pcwd_cleanup_module);
1028
1029 MODULE_AUTHOR("Ken Hollis <kenji@bitgate.com>, Wim Van Sebroeck <wim@iguana.be>");
1030 MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver");
1031 MODULE_VERSION(WATCHDOG_VERSION);
1032 MODULE_LICENSE("GPL");
1033 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
1034 MODULE_ALIAS_MISCDEV(TEMP_MINOR);
Support for the Chinese Samsung S3C2440 based development boards