Commit | Line | Data |
---|---|---|
09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * PC Watchdog Driver | |
4 | * by Ken Hollis (khollis@bitgate.com) | |
5 | * | |
f9146f26 | 6 | * Permission granted from Simon Machell (smachell@berkprod.com) |
1da177e4 LT |
7 | * Written for the Linux Kernel, and GPLed by Ken Hollis |
8 | * | |
9 | * 960107 Added request_region routines, modulized the whole thing. | |
10 | * 960108 Fixed end-of-file pointer (Thanks to Dan Hollis), added | |
11 | * WD_TIMEOUT define. | |
12 | * 960216 Added eof marker on the file, and changed verbose messages. | |
13 | * 960716 Made functional and cosmetic changes to the source for | |
14 | * inclusion in Linux 2.0.x kernels, thanks to Alan Cox. | |
15 | * 960717 Removed read/seek routines, replaced with ioctl. Also, added | |
16 | * check_region command due to Alan's suggestion. | |
17 | * 960821 Made changes to compile in newer 2.0.x kernels. Added | |
18 | * "cold reboot sense" entry. | |
19 | * 960825 Made a few changes to code, deleted some defines and made | |
20 | * typedefs to replace them. Made heartbeat reset only available | |
21 | * via ioctl, and removed the write routine. | |
22 | * 960828 Added new items for PC Watchdog Rev.C card. | |
23 | * 960829 Changed around all of the IOCTLs, added new features, | |
24 | * added watchdog disable/re-enable routines. Added firmware | |
25 | * version reporting. Added read routine for temperature. | |
26 | * Removed some extra defines, added an autodetect Revision | |
27 | * routine. | |
143a2e54 WVS |
28 | * 961006 Revised some documentation, fixed some cosmetic bugs. Made |
29 | * drivers to panic the system if it's overheating at bootup. | |
1da177e4 LT |
30 | * 961118 Changed some verbiage on some of the output, tidied up |
31 | * code bits, and added compatibility to 2.1.x. | |
143a2e54 | 32 | * 970912 Enabled board on open and disable on close. |
1da177e4 | 33 | * 971107 Took account of recent VFS changes (broke read). |
143a2e54 WVS |
34 | * 971210 Disable board on initialisation in case board already ticking. |
35 | * 971222 Changed open/close for temperature handling | |
36 | * Michael Meskes <meskes@debian.org>. | |
37 | * 980112 Used minor numbers from include/linux/miscdevice.h | |
38 | * 990403 Clear reset status after reading control status register in | |
39 | * pcwd_showprevstate(). [Marc Boucher <marc@mbsi.ca>] | |
1da177e4 LT |
40 | * 990605 Made changes to code to support Firmware 1.22a, added |
41 | * fairly useless proc entry. | |
42 | * 990610 removed said useless proc code for the merge <alan> | |
43 | * 000403 Removed last traces of proc code. <davej> | |
261dcc70 AC |
44 | * 011214 Added nowayout module option to override |
45 | * CONFIG_WATCHDOG_NOWAYOUT <Matt_Domsch@dell.com> | |
143a2e54 | 46 | * Added timeout module option to override default |
1da177e4 LT |
47 | */ |
48 | ||
49 | /* | |
50 | * A bells and whistles driver is available from http://www.pcwd.de/ | |
261dcc70 AC |
51 | * More info available at http://www.berkprod.com/ or |
52 | * http://www.pcwatchdog.com/ | |
1da177e4 LT |
53 | */ |
54 | ||
27c766aa JP |
55 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
56 | ||
fd41fa61 WVS |
57 | #include <linux/module.h> /* For module specific items */ |
58 | #include <linux/moduleparam.h> /* For new moduleparam's */ | |
59 | #include <linux/types.h> /* For standard types (like size_t) */ | |
60 | #include <linux/errno.h> /* For the -ENODEV/... values */ | |
61 | #include <linux/kernel.h> /* For printk/panic/... */ | |
62 | #include <linux/delay.h> /* For mdelay function */ | |
63 | #include <linux/timer.h> /* For timer related operations */ | |
64 | #include <linux/jiffies.h> /* For jiffies stuff */ | |
487722cf | 65 | #include <linux/miscdevice.h> /* For struct miscdevice */ |
fd41fa61 | 66 | #include <linux/watchdog.h> /* For the watchdog specific items */ |
5aa15050 | 67 | #include <linux/reboot.h> /* For kernel_power_off() */ |
fd41fa61 WVS |
68 | #include <linux/init.h> /* For __init/__exit/... */ |
69 | #include <linux/fs.h> /* For file operations */ | |
5aa15050 | 70 | #include <linux/isa.h> /* For isa devices */ |
fd41fa61 WVS |
71 | #include <linux/ioport.h> /* For io-port access */ |
72 | #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */ | |
261dcc70 AC |
73 | #include <linux/uaccess.h> /* For copy_to_user/put_user/... */ |
74 | #include <linux/io.h> /* For inb/outb/... */ | |
fd41fa61 WVS |
75 | |
76 | /* Module and version information */ | |
5aa15050 WVS |
77 | #define WATCHDOG_VERSION "1.20" |
78 | #define WATCHDOG_DATE "18 Feb 2007" | |
a7122f91 WVS |
79 | #define WATCHDOG_DRIVER_NAME "ISA-PC Watchdog" |
80 | #define WATCHDOG_NAME "pcwd" | |
143a2e54 | 81 | #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION "\n" |
1da177e4 LT |
82 | |
83 | /* | |
84 | * It should be noted that PCWD_REVISION_B was removed because A and B | |
85 | * are essentially the same types of card, with the exception that B | |
86 | * has temperature reporting. Since I didn't receive a Rev.B card, | |
87 | * the Rev.B card is not supported. (It's a good thing too, as they | |
88 | * are no longer in production.) | |
89 | */ | |
90 | #define PCWD_REVISION_A 1 | |
91 | #define PCWD_REVISION_C 2 | |
92 | ||
5aa15050 WVS |
93 | /* |
94 | * These are the auto-probe addresses available. | |
95 | * | |
96 | * Revision A only uses ports 0x270 and 0x370. Revision C introduced 0x350. | |
97 | * Revision A has an address range of 2 addresses, while Revision C has 4. | |
98 | */ | |
99 | #define PCWD_ISA_NR_CARDS 3 | |
100 | static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 }; | |
101 | ||
1da177e4 | 102 | /* |
8f0235dc WVS |
103 | * These are the defines that describe the control status bits for the |
104 | * PCI-PC Watchdog card. | |
105 | */ | |
106 | /* Port 1 : Control Status #1 for the PC Watchdog card, revision A. */ | |
4206f0c4 WVS |
107 | #define WD_WDRST 0x01 /* Previously reset state */ |
108 | #define WD_T110 0x02 /* Temperature overheat sense */ | |
109 | #define WD_HRTBT 0x04 /* Heartbeat sense */ | |
110 | #define WD_RLY2 0x08 /* External relay triggered */ | |
111 | #define WD_SRLY2 0x80 /* Software external relay triggered */ | |
8f0235dc | 112 | /* Port 1 : Control Status #1 for the PC Watchdog card, revision C. */ |
4206f0c4 WVS |
113 | #define WD_REVC_WTRP 0x01 /* Watchdog Trip status */ |
114 | #define WD_REVC_HRBT 0x02 /* Watchdog Heartbeat */ | |
115 | #define WD_REVC_TTRP 0x04 /* Temperature Trip status */ | |
261dcc70 AC |
116 | #define WD_REVC_RL2A 0x08 /* Relay 2 activated by |
117 | on-board processor */ | |
4206f0c4 WVS |
118 | #define WD_REVC_RL1A 0x10 /* Relay 1 active */ |
119 | #define WD_REVC_R2DS 0x40 /* Relay 2 disable */ | |
120 | #define WD_REVC_RLY2 0x80 /* Relay 2 activated? */ | |
8f0235dc WVS |
121 | /* Port 2 : Control Status #2 */ |
122 | #define WD_WDIS 0x10 /* Watchdog Disabled */ | |
123 | #define WD_ENTP 0x20 /* Watchdog Enable Temperature Trip */ | |
261dcc70 AC |
124 | #define WD_SSEL 0x40 /* Watchdog Switch Select |
125 | (1:SW1 <-> 0:SW2) */ | |
8f0235dc | 126 | #define WD_WCMD 0x80 /* Watchdog Command Mode */ |
1da177e4 LT |
127 | |
128 | /* max. time we give an ISA watchdog card to process a command */ | |
129 | /* 500ms for each 4 bit response (according to spec.) */ | |
130 | #define ISA_COMMAND_TIMEOUT 1000 | |
131 | ||
132 | /* Watchdog's internal commands */ | |
fd41fa61 WVS |
133 | #define CMD_ISA_IDLE 0x00 |
134 | #define CMD_ISA_VERSION_INTEGER 0x01 | |
135 | #define CMD_ISA_VERSION_TENTH 0x02 | |
136 | #define CMD_ISA_VERSION_HUNDRETH 0x03 | |
137 | #define CMD_ISA_VERSION_MINOR 0x04 | |
138 | #define CMD_ISA_SWITCH_SETTINGS 0x05 | |
369fa252 WVS |
139 | #define CMD_ISA_RESET_PC 0x06 |
140 | #define CMD_ISA_ARM_0 0x07 | |
141 | #define CMD_ISA_ARM_30 0x08 | |
142 | #define CMD_ISA_ARM_60 0x09 | |
fd41fa61 WVS |
143 | #define CMD_ISA_DELAY_TIME_2SECS 0x0A |
144 | #define CMD_ISA_DELAY_TIME_4SECS 0x0B | |
145 | #define CMD_ISA_DELAY_TIME_8SECS 0x0C | |
369fa252 | 146 | #define CMD_ISA_RESET_RELAYS 0x0D |
1da177e4 | 147 | |
f3dc0733 | 148 | /* Watchdog's Dip Switch heartbeat values */ |
7944d3a5 | 149 | static const int heartbeat_tbl[] = { |
f3dc0733 WVS |
150 | 20, /* OFF-OFF-OFF = 20 Sec */ |
151 | 40, /* OFF-OFF-ON = 40 Sec */ | |
152 | 60, /* OFF-ON-OFF = 1 Min */ | |
153 | 300, /* OFF-ON-ON = 5 Min */ | |
154 | 600, /* ON-OFF-OFF = 10 Min */ | |
155 | 1800, /* ON-OFF-ON = 30 Min */ | |
156 | 3600, /* ON-ON-OFF = 1 Hour */ | |
157 | 7200, /* ON-ON-ON = 2 hour */ | |
158 | }; | |
159 | ||
1da177e4 LT |
160 | /* |
161 | * We are using an kernel timer to do the pinging of the watchdog | |
162 | * every ~500ms. We try to set the internal heartbeat of the | |
163 | * watchdog to 2 ms. | |
164 | */ | |
165 | ||
166 | #define WDT_INTERVAL (HZ/2+1) | |
167 | ||
168 | /* We can only use 1 card due to the /dev/watchdog restriction */ | |
169 | static int cards_found; | |
170 | ||
171 | /* internal variables */ | |
36cbaa87 | 172 | static unsigned long open_allowed; |
1da177e4 | 173 | static char expect_close; |
1da177e4 | 174 | static int temp_panic; |
261dcc70 AC |
175 | |
176 | /* this is private data for each ISA-PC watchdog card */ | |
177 | static struct { | |
2891b6ad | 178 | char fw_ver_str[6]; /* The cards firmware version */ |
a2be8786 | 179 | int revision; /* The card's revision */ |
261dcc70 AC |
180 | int supports_temp; /* Whether or not the card has |
181 | a temperature device */ | |
182 | int command_mode; /* Whether or not the card is in | |
183 | command mode */ | |
a2be8786 WVS |
184 | int boot_status; /* The card's boot status */ |
185 | int io_addr; /* The cards I/O address */ | |
186 | spinlock_t io_lock; /* the lock for io operations */ | |
187 | struct timer_list timer; /* The timer that pings the watchdog */ | |
188 | unsigned long next_heartbeat; /* the next_heartbeat for the timer */ | |
189 | } pcwd_private; | |
1da177e4 LT |
190 | |
191 | /* module parameters */ | |
c324ab42 WVS |
192 | #define QUIET 0 /* Default */ |
193 | #define VERBOSE 1 /* Verbose */ | |
194 | #define DEBUG 2 /* print fancy stuff too */ | |
195 | static int debug = QUIET; | |
196 | module_param(debug, int, 0); | |
261dcc70 AC |
197 | MODULE_PARM_DESC(debug, |
198 | "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)"); | |
c324ab42 | 199 | |
261dcc70 AC |
200 | /* default heartbeat = delay-time from dip-switches */ |
201 | #define WATCHDOG_HEARTBEAT 0 | |
1da177e4 LT |
202 | static int heartbeat = WATCHDOG_HEARTBEAT; |
203 | module_param(heartbeat, int, 0); | |
143a2e54 WVS |
204 | MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. " |
205 | "(2 <= heartbeat <= 7200 or 0=delay-time from dip-switches, default=" | |
206 | __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); | |
1da177e4 | 207 | |
86a1e189 WVS |
208 | static bool nowayout = WATCHDOG_NOWAYOUT; |
209 | module_param(nowayout, bool, 0); | |
261dcc70 AC |
210 | MODULE_PARM_DESC(nowayout, |
211 | "Watchdog cannot be stopped once started (default=" | |
212 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
1da177e4 LT |
213 | |
214 | /* | |
215 | * Internal functions | |
216 | */ | |
217 | ||
218 | static int send_isa_command(int cmd) | |
219 | { | |
220 | int i; | |
221 | int control_status; | |
222 | int port0, last_port0; /* Double read for stabilising */ | |
223 | ||
c324ab42 | 224 | if (debug >= DEBUG) |
27c766aa | 225 | pr_debug("sending following data cmd=0x%02x\n", cmd); |
c324ab42 | 226 | |
1da177e4 | 227 | /* The WCMD bit must be 1 and the command is only 4 bits in size */ |
8f0235dc | 228 | control_status = (cmd & 0x0F) | WD_WCMD; |
a2be8786 | 229 | outb_p(control_status, pcwd_private.io_addr + 2); |
1da177e4 LT |
230 | udelay(ISA_COMMAND_TIMEOUT); |
231 | ||
a2be8786 | 232 | port0 = inb_p(pcwd_private.io_addr); |
1da177e4 LT |
233 | for (i = 0; i < 25; ++i) { |
234 | last_port0 = port0; | |
a2be8786 | 235 | port0 = inb_p(pcwd_private.io_addr); |
1da177e4 LT |
236 | |
237 | if (port0 == last_port0) | |
238 | break; /* Data is stable */ | |
239 | ||
261dcc70 | 240 | udelay(250); |
1da177e4 LT |
241 | } |
242 | ||
c324ab42 | 243 | if (debug >= DEBUG) |
27c766aa JP |
244 | pr_debug("received following data for cmd=0x%02x: port0=0x%02x last_port0=0x%02x\n", |
245 | cmd, port0, last_port0); | |
c324ab42 | 246 | |
1da177e4 LT |
247 | return port0; |
248 | } | |
249 | ||
250 | static int set_command_mode(void) | |
251 | { | |
261dcc70 | 252 | int i, found = 0, count = 0; |
1da177e4 LT |
253 | |
254 | /* Set the card into command mode */ | |
a2be8786 | 255 | spin_lock(&pcwd_private.io_lock); |
1da177e4 LT |
256 | while ((!found) && (count < 3)) { |
257 | i = send_isa_command(CMD_ISA_IDLE); | |
258 | ||
259 | if (i == 0x00) | |
260 | found = 1; | |
261 | else if (i == 0xF3) { | |
262 | /* Card does not like what we've done to it */ | |
a2be8786 | 263 | outb_p(0x00, pcwd_private.io_addr + 2); |
1da177e4 | 264 | udelay(1200); /* Spec says wait 1ms */ |
a2be8786 | 265 | outb_p(0x00, pcwd_private.io_addr + 2); |
1da177e4 LT |
266 | udelay(ISA_COMMAND_TIMEOUT); |
267 | } | |
268 | count++; | |
269 | } | |
a2be8786 WVS |
270 | spin_unlock(&pcwd_private.io_lock); |
271 | pcwd_private.command_mode = found; | |
1da177e4 | 272 | |
c324ab42 | 273 | if (debug >= DEBUG) |
27c766aa | 274 | pr_debug("command_mode=%d\n", pcwd_private.command_mode); |
c324ab42 | 275 | |
7944d3a5 | 276 | return found; |
1da177e4 LT |
277 | } |
278 | ||
279 | static void unset_command_mode(void) | |
280 | { | |
281 | /* Set the card into normal mode */ | |
a2be8786 WVS |
282 | spin_lock(&pcwd_private.io_lock); |
283 | outb_p(0x00, pcwd_private.io_addr + 2); | |
1da177e4 | 284 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 | 285 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 | 286 | |
a2be8786 | 287 | pcwd_private.command_mode = 0; |
c324ab42 WVS |
288 | |
289 | if (debug >= DEBUG) | |
27c766aa | 290 | pr_debug("command_mode=%d\n", pcwd_private.command_mode); |
1da177e4 LT |
291 | } |
292 | ||
85875211 WVS |
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 | ||
2891b6ad | 299 | static inline void pcwd_get_firmware(void) |
af3b38d9 WVS |
300 | { |
301 | int one, ten, hund, minor; | |
af3b38d9 | 302 | |
6bbc20bc | 303 | strcpy(pcwd_private.fw_ver_str, "ERROR"); |
af3b38d9 WVS |
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); | |
261dcc70 AC |
310 | sprintf(pcwd_private.fw_ver_str, "%c.%c%c%c", |
311 | one, ten, hund, minor); | |
af3b38d9 | 312 | } |
af3b38d9 | 313 | unset_command_mode(); |
2891b6ad WVS |
314 | |
315 | return; | |
af3b38d9 WVS |
316 | } |
317 | ||
318 | static inline int pcwd_get_option_switches(void) | |
319 | { | |
261dcc70 | 320 | int option_switches = 0; |
af3b38d9 WVS |
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(); | |
7944d3a5 | 328 | return option_switches; |
af3b38d9 WVS |
329 | } |
330 | ||
331 | static void pcwd_show_card_info(void) | |
332 | { | |
af3b38d9 WVS |
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) | |
27c766aa JP |
337 | pr_info("ISA-PC Watchdog (REV.A) detected at port 0x%04x\n", |
338 | pcwd_private.io_addr); | |
af3b38d9 | 339 | else if (pcwd_private.revision == PCWD_REVISION_C) { |
2891b6ad | 340 | pcwd_get_firmware(); |
27c766aa | 341 | pr_info("ISA-PC Watchdog (REV.C) detected at port 0x%04x (Firmware version: %s)\n", |
2891b6ad | 342 | pcwd_private.io_addr, pcwd_private.fw_ver_str); |
af3b38d9 | 343 | option_switches = pcwd_get_option_switches(); |
27c766aa | 344 | pr_info("Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n", |
af3b38d9 WVS |
345 | option_switches, |
346 | ((option_switches & 0x10) ? "ON" : "OFF"), | |
347 | ((option_switches & 0x08) ? "ON" : "OFF")); | |
348 | ||
349 | /* Reprogram internal heartbeat to 2 seconds */ | |
350 | if (set_command_mode()) { | |
351 | send_isa_command(CMD_ISA_DELAY_TIME_2SECS); | |
352 | unset_command_mode(); | |
353 | } | |
354 | } | |
355 | ||
356 | if (pcwd_private.supports_temp) | |
27c766aa | 357 | pr_info("Temperature Option Detected\n"); |
af3b38d9 WVS |
358 | |
359 | if (pcwd_private.boot_status & WDIOF_CARDRESET) | |
27c766aa | 360 | pr_info("Previous reboot was caused by the card\n"); |
af3b38d9 WVS |
361 | |
362 | if (pcwd_private.boot_status & WDIOF_OVERHEAT) { | |
27c766aa JP |
363 | pr_emerg("Card senses a CPU Overheat. Panicking!\n"); |
364 | pr_emerg("CPU Overheat\n"); | |
af3b38d9 WVS |
365 | } |
366 | ||
367 | if (pcwd_private.boot_status == 0) | |
27c766aa | 368 | pr_info("No previous trip detected - Cold boot or reset\n"); |
af3b38d9 WVS |
369 | } |
370 | ||
e99e88a9 | 371 | static void pcwd_timer_ping(struct timer_list *unused) |
1da177e4 LT |
372 | { |
373 | int wdrst_stat; | |
374 | ||
375 | /* If we got a heartbeat pulse within the WDT_INTERVAL | |
376 | * we agree to ping the WDT */ | |
261dcc70 | 377 | if (time_before(jiffies, pcwd_private.next_heartbeat)) { |
1da177e4 | 378 | /* Ping the watchdog */ |
a2be8786 WVS |
379 | spin_lock(&pcwd_private.io_lock); |
380 | if (pcwd_private.revision == PCWD_REVISION_A) { | |
261dcc70 AC |
381 | /* Rev A cards are reset by setting the |
382 | WD_WDRST bit in register 1 */ | |
a2be8786 | 383 | wdrst_stat = inb_p(pcwd_private.io_addr); |
1da177e4 LT |
384 | wdrst_stat &= 0x0F; |
385 | wdrst_stat |= WD_WDRST; | |
386 | ||
a2be8786 | 387 | outb_p(wdrst_stat, pcwd_private.io_addr + 1); |
1da177e4 LT |
388 | } else { |
389 | /* Re-trigger watchdog by writing to port 0 */ | |
a2be8786 | 390 | outb_p(0x00, pcwd_private.io_addr); |
1da177e4 LT |
391 | } |
392 | ||
393 | /* Re-set the timer interval */ | |
a2be8786 | 394 | mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); |
1da177e4 | 395 | |
a2be8786 | 396 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 | 397 | } else { |
27c766aa | 398 | pr_warn("Heartbeat lost! Will not ping the watchdog\n"); |
1da177e4 LT |
399 | } |
400 | } | |
401 | ||
402 | static int pcwd_start(void) | |
403 | { | |
404 | int stat_reg; | |
405 | ||
a2be8786 | 406 | pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); |
1da177e4 LT |
407 | |
408 | /* Start the timer */ | |
a2be8786 | 409 | mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); |
1da177e4 LT |
410 | |
411 | /* Enable the port */ | |
a2be8786 WVS |
412 | if (pcwd_private.revision == PCWD_REVISION_C) { |
413 | spin_lock(&pcwd_private.io_lock); | |
414 | outb_p(0x00, pcwd_private.io_addr + 3); | |
1da177e4 | 415 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 WVS |
416 | stat_reg = inb_p(pcwd_private.io_addr + 2); |
417 | spin_unlock(&pcwd_private.io_lock); | |
8f0235dc | 418 | if (stat_reg & WD_WDIS) { |
27c766aa | 419 | pr_info("Could not start watchdog\n"); |
1da177e4 LT |
420 | return -EIO; |
421 | } | |
422 | } | |
c324ab42 WVS |
423 | |
424 | if (debug >= VERBOSE) | |
27c766aa | 425 | pr_debug("Watchdog started\n"); |
c324ab42 | 426 | |
1da177e4 LT |
427 | return 0; |
428 | } | |
429 | ||
430 | static int pcwd_stop(void) | |
431 | { | |
432 | int stat_reg; | |
433 | ||
434 | /* Stop the timer */ | |
a2be8786 | 435 | del_timer(&pcwd_private.timer); |
1da177e4 LT |
436 | |
437 | /* Disable the board */ | |
a2be8786 WVS |
438 | if (pcwd_private.revision == PCWD_REVISION_C) { |
439 | spin_lock(&pcwd_private.io_lock); | |
440 | outb_p(0xA5, pcwd_private.io_addr + 3); | |
1da177e4 | 441 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 | 442 | outb_p(0xA5, pcwd_private.io_addr + 3); |
1da177e4 | 443 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 WVS |
444 | stat_reg = inb_p(pcwd_private.io_addr + 2); |
445 | spin_unlock(&pcwd_private.io_lock); | |
8f0235dc | 446 | if ((stat_reg & WD_WDIS) == 0) { |
27c766aa | 447 | pr_info("Could not stop watchdog\n"); |
1da177e4 LT |
448 | return -EIO; |
449 | } | |
450 | } | |
c324ab42 WVS |
451 | |
452 | if (debug >= VERBOSE) | |
27c766aa | 453 | pr_debug("Watchdog stopped\n"); |
c324ab42 | 454 | |
1da177e4 LT |
455 | return 0; |
456 | } | |
457 | ||
458 | static int pcwd_keepalive(void) | |
459 | { | |
460 | /* user land ping */ | |
a2be8786 | 461 | pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); |
c324ab42 WVS |
462 | |
463 | if (debug >= DEBUG) | |
27c766aa | 464 | pr_debug("Watchdog keepalive signal send\n"); |
c324ab42 | 465 | |
1da177e4 LT |
466 | return 0; |
467 | } | |
468 | ||
469 | static int pcwd_set_heartbeat(int t) | |
470 | { | |
261dcc70 | 471 | if (t < 2 || t > 7200) /* arbitrary upper limit */ |
1da177e4 LT |
472 | return -EINVAL; |
473 | ||
474 | heartbeat = t; | |
c324ab42 WVS |
475 | |
476 | if (debug >= VERBOSE) | |
27c766aa | 477 | pr_debug("New heartbeat: %d\n", heartbeat); |
c324ab42 | 478 | |
1da177e4 LT |
479 | return 0; |
480 | } | |
481 | ||
482 | static int pcwd_get_status(int *status) | |
483 | { | |
4206f0c4 | 484 | int control_status; |
1da177e4 | 485 | |
261dcc70 | 486 | *status = 0; |
a2be8786 WVS |
487 | spin_lock(&pcwd_private.io_lock); |
488 | if (pcwd_private.revision == PCWD_REVISION_A) | |
1da177e4 LT |
489 | /* Rev A cards return status information from |
490 | * the base register, which is used for the | |
491 | * temperature in other cards. */ | |
4206f0c4 | 492 | control_status = inb(pcwd_private.io_addr); |
1da177e4 LT |
493 | else { |
494 | /* Rev C cards return card status in the base | |
495 | * address + 1 register. And use different bits | |
496 | * to indicate a card initiated reset, and an | |
497 | * over-temperature condition. And the reboot | |
498 | * status can be reset. */ | |
4206f0c4 | 499 | control_status = inb(pcwd_private.io_addr + 1); |
1da177e4 | 500 | } |
a2be8786 | 501 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 | 502 | |
a2be8786 | 503 | if (pcwd_private.revision == PCWD_REVISION_A) { |
4206f0c4 | 504 | if (control_status & WD_WDRST) |
1da177e4 LT |
505 | *status |= WDIOF_CARDRESET; |
506 | ||
4206f0c4 | 507 | if (control_status & WD_T110) { |
1da177e4 LT |
508 | *status |= WDIOF_OVERHEAT; |
509 | if (temp_panic) { | |
27c766aa | 510 | pr_info("Temperature overheat trip!\n"); |
68acc05d | 511 | kernel_power_off(); |
1da177e4 LT |
512 | } |
513 | } | |
514 | } else { | |
4206f0c4 | 515 | if (control_status & WD_REVC_WTRP) |
1da177e4 LT |
516 | *status |= WDIOF_CARDRESET; |
517 | ||
4206f0c4 | 518 | if (control_status & WD_REVC_TTRP) { |
1da177e4 LT |
519 | *status |= WDIOF_OVERHEAT; |
520 | if (temp_panic) { | |
27c766aa | 521 | pr_info("Temperature overheat trip!\n"); |
68acc05d | 522 | kernel_power_off(); |
1da177e4 LT |
523 | } |
524 | } | |
525 | } | |
526 | ||
527 | return 0; | |
528 | } | |
529 | ||
530 | static int pcwd_clear_status(void) | |
531 | { | |
4206f0c4 WVS |
532 | int control_status; |
533 | ||
a2be8786 WVS |
534 | if (pcwd_private.revision == PCWD_REVISION_C) { |
535 | spin_lock(&pcwd_private.io_lock); | |
4206f0c4 | 536 | |
c324ab42 | 537 | if (debug >= VERBOSE) |
27c766aa | 538 | pr_info("clearing watchdog trip status\n"); |
c324ab42 | 539 | |
4206f0c4 WVS |
540 | control_status = inb_p(pcwd_private.io_addr + 1); |
541 | ||
c324ab42 | 542 | if (debug >= DEBUG) { |
27c766aa JP |
543 | pr_debug("status was: 0x%02x\n", control_status); |
544 | pr_debug("sending: 0x%02x\n", | |
545 | (control_status & WD_REVC_R2DS)); | |
c324ab42 WVS |
546 | } |
547 | ||
4206f0c4 | 548 | /* clear reset status & Keep Relay 2 disable state as it is */ |
261dcc70 AC |
549 | outb_p((control_status & WD_REVC_R2DS), |
550 | pcwd_private.io_addr + 1); | |
4206f0c4 | 551 | |
a2be8786 | 552 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 LT |
553 | } |
554 | return 0; | |
555 | } | |
556 | ||
557 | static int pcwd_get_temperature(int *temperature) | |
558 | { | |
559 | /* check that port 0 gives temperature info and no command results */ | |
a2be8786 | 560 | if (pcwd_private.command_mode) |
1da177e4 LT |
561 | return -1; |
562 | ||
563 | *temperature = 0; | |
a2be8786 | 564 | if (!pcwd_private.supports_temp) |
1da177e4 LT |
565 | return -ENODEV; |
566 | ||
567 | /* | |
568 | * Convert celsius to fahrenheit, since this was | |
569 | * the decided 'standard' for this return value. | |
570 | */ | |
a2be8786 WVS |
571 | spin_lock(&pcwd_private.io_lock); |
572 | *temperature = ((inb(pcwd_private.io_addr)) * 9 / 5) + 32; | |
573 | spin_unlock(&pcwd_private.io_lock); | |
1da177e4 | 574 | |
c324ab42 | 575 | if (debug >= DEBUG) { |
27c766aa | 576 | pr_debug("temperature is: %d F\n", *temperature); |
c324ab42 WVS |
577 | } |
578 | ||
1da177e4 LT |
579 | return 0; |
580 | } | |
581 | ||
582 | /* | |
583 | * /dev/watchdog handling | |
584 | */ | |
585 | ||
261dcc70 | 586 | static long pcwd_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
587 | { |
588 | int rv; | |
589 | int status; | |
590 | int temperature; | |
591 | int new_heartbeat; | |
592 | int __user *argp = (int __user *)arg; | |
42747d71 | 593 | static const struct watchdog_info ident = { |
1da177e4 LT |
594 | .options = WDIOF_OVERHEAT | |
595 | WDIOF_CARDRESET | | |
596 | WDIOF_KEEPALIVEPING | | |
597 | WDIOF_SETTIMEOUT | | |
598 | WDIOF_MAGICCLOSE, | |
599 | .firmware_version = 1, | |
600 | .identity = "PCWD", | |
601 | }; | |
602 | ||
261dcc70 | 603 | switch (cmd) { |
1da177e4 | 604 | case WDIOC_GETSUPPORT: |
261dcc70 | 605 | if (copy_to_user(argp, &ident, sizeof(ident))) |
1da177e4 LT |
606 | return -EFAULT; |
607 | return 0; | |
608 | ||
609 | case WDIOC_GETSTATUS: | |
610 | pcwd_get_status(&status); | |
611 | return put_user(status, argp); | |
612 | ||
613 | case WDIOC_GETBOOTSTATUS: | |
a2be8786 | 614 | return put_user(pcwd_private.boot_status, argp); |
1da177e4 LT |
615 | |
616 | case WDIOC_GETTEMP: | |
617 | if (pcwd_get_temperature(&temperature)) | |
618 | return -EFAULT; | |
619 | ||
620 | return put_user(temperature, argp); | |
621 | ||
622 | case WDIOC_SETOPTIONS: | |
261dcc70 AC |
623 | if (pcwd_private.revision == PCWD_REVISION_C) { |
624 | if (get_user(rv, argp)) | |
1da177e4 LT |
625 | return -EFAULT; |
626 | ||
261dcc70 AC |
627 | if (rv & WDIOS_DISABLECARD) { |
628 | status = pcwd_stop(); | |
629 | if (status < 0) | |
630 | return status; | |
1da177e4 | 631 | } |
261dcc70 AC |
632 | if (rv & WDIOS_ENABLECARD) { |
633 | status = pcwd_start(); | |
634 | if (status < 0) | |
635 | return status; | |
1da177e4 | 636 | } |
1da177e4 | 637 | if (rv & WDIOS_TEMPPANIC) |
1da177e4 | 638 | temp_panic = 1; |
1da177e4 LT |
639 | } |
640 | return -EINVAL; | |
641 | ||
642 | case WDIOC_KEEPALIVE: | |
643 | pcwd_keepalive(); | |
644 | return 0; | |
645 | ||
646 | case WDIOC_SETTIMEOUT: | |
647 | if (get_user(new_heartbeat, argp)) | |
648 | return -EFAULT; | |
649 | ||
650 | if (pcwd_set_heartbeat(new_heartbeat)) | |
651 | return -EINVAL; | |
652 | ||
653 | pcwd_keepalive(); | |
654 | /* Fall */ | |
655 | ||
656 | case WDIOC_GETTIMEOUT: | |
657 | return put_user(heartbeat, argp); | |
0c06090c WVS |
658 | |
659 | default: | |
660 | return -ENOTTY; | |
1da177e4 LT |
661 | } |
662 | ||
663 | return 0; | |
664 | } | |
665 | ||
666 | static ssize_t pcwd_write(struct file *file, const char __user *buf, size_t len, | |
667 | loff_t *ppos) | |
668 | { | |
669 | if (len) { | |
670 | if (!nowayout) { | |
671 | size_t i; | |
672 | ||
673 | /* In case it was set long ago */ | |
674 | expect_close = 0; | |
675 | ||
676 | for (i = 0; i != len; i++) { | |
677 | char c; | |
678 | ||
679 | if (get_user(c, buf + i)) | |
680 | return -EFAULT; | |
681 | if (c == 'V') | |
682 | expect_close = 42; | |
683 | } | |
684 | } | |
685 | pcwd_keepalive(); | |
686 | } | |
687 | return len; | |
688 | } | |
689 | ||
690 | static int pcwd_open(struct inode *inode, struct file *file) | |
691 | { | |
261dcc70 | 692 | if (test_and_set_bit(0, &open_allowed)) |
1da177e4 | 693 | return -EBUSY; |
1da177e4 LT |
694 | if (nowayout) |
695 | __module_get(THIS_MODULE); | |
1da177e4 LT |
696 | /* Activate */ |
697 | pcwd_start(); | |
698 | pcwd_keepalive(); | |
c5bf68fe | 699 | return stream_open(inode, file); |
1da177e4 LT |
700 | } |
701 | ||
702 | static int pcwd_close(struct inode *inode, struct file *file) | |
703 | { | |
261dcc70 | 704 | if (expect_close == 42) |
1da177e4 | 705 | pcwd_stop(); |
261dcc70 | 706 | else { |
27c766aa | 707 | pr_crit("Unexpected close, not stopping watchdog!\n"); |
1da177e4 LT |
708 | pcwd_keepalive(); |
709 | } | |
710 | expect_close = 0; | |
261dcc70 | 711 | clear_bit(0, &open_allowed); |
1da177e4 LT |
712 | return 0; |
713 | } | |
714 | ||
715 | /* | |
716 | * /dev/temperature handling | |
717 | */ | |
718 | ||
719 | static ssize_t pcwd_temp_read(struct file *file, char __user *buf, size_t count, | |
720 | loff_t *ppos) | |
721 | { | |
722 | int temperature; | |
723 | ||
724 | if (pcwd_get_temperature(&temperature)) | |
725 | return -EFAULT; | |
726 | ||
727 | if (copy_to_user(buf, &temperature, 1)) | |
728 | return -EFAULT; | |
729 | ||
730 | return 1; | |
731 | } | |
732 | ||
733 | static int pcwd_temp_open(struct inode *inode, struct file *file) | |
734 | { | |
a2be8786 | 735 | if (!pcwd_private.supports_temp) |
1da177e4 LT |
736 | return -ENODEV; |
737 | ||
c5bf68fe | 738 | return stream_open(inode, file); |
1da177e4 LT |
739 | } |
740 | ||
741 | static int pcwd_temp_close(struct inode *inode, struct file *file) | |
742 | { | |
743 | return 0; | |
744 | } | |
745 | ||
1da177e4 LT |
746 | /* |
747 | * Kernel Interfaces | |
748 | */ | |
749 | ||
62322d25 | 750 | static const struct file_operations pcwd_fops = { |
1da177e4 LT |
751 | .owner = THIS_MODULE, |
752 | .llseek = no_llseek, | |
753 | .write = pcwd_write, | |
261dcc70 | 754 | .unlocked_ioctl = pcwd_ioctl, |
1da177e4 LT |
755 | .open = pcwd_open, |
756 | .release = pcwd_close, | |
757 | }; | |
758 | ||
759 | static struct miscdevice pcwd_miscdev = { | |
760 | .minor = WATCHDOG_MINOR, | |
761 | .name = "watchdog", | |
762 | .fops = &pcwd_fops, | |
763 | }; | |
764 | ||
62322d25 | 765 | static const struct file_operations pcwd_temp_fops = { |
1da177e4 LT |
766 | .owner = THIS_MODULE, |
767 | .llseek = no_llseek, | |
768 | .read = pcwd_temp_read, | |
769 | .open = pcwd_temp_open, | |
770 | .release = pcwd_temp_close, | |
771 | }; | |
772 | ||
773 | static struct miscdevice temp_miscdev = { | |
774 | .minor = TEMP_MINOR, | |
775 | .name = "temperature", | |
776 | .fops = &pcwd_temp_fops, | |
777 | }; | |
778 | ||
1da177e4 LT |
779 | /* |
780 | * Init & exit routines | |
781 | */ | |
782 | ||
1da177e4 LT |
783 | static inline int get_revision(void) |
784 | { | |
785 | int r = PCWD_REVISION_C; | |
786 | ||
a2be8786 | 787 | spin_lock(&pcwd_private.io_lock); |
1da177e4 LT |
788 | /* REV A cards use only 2 io ports; test |
789 | * presumes a floating bus reads as 0xff. */ | |
a2be8786 WVS |
790 | if ((inb(pcwd_private.io_addr + 2) == 0xFF) || |
791 | (inb(pcwd_private.io_addr + 3) == 0xFF)) | |
261dcc70 | 792 | r = PCWD_REVISION_A; |
a2be8786 | 793 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 LT |
794 | |
795 | return r; | |
796 | } | |
797 | ||
5aa15050 WVS |
798 | /* |
799 | * The ISA cards have a heartbeat bit in one of the registers, which | |
800 | * register is card dependent. The heartbeat bit is monitored, and if | |
801 | * found, is considered proof that a Berkshire card has been found. | |
802 | * The initial rate is once per second at board start up, then twice | |
803 | * per second for normal operation. | |
804 | */ | |
2d991a16 | 805 | static int pcwd_isa_match(struct device *dev, unsigned int id) |
5aa15050 | 806 | { |
261dcc70 | 807 | int base_addr = pcwd_ioports[id]; |
5aa15050 WVS |
808 | int port0, last_port0; /* Reg 0, in case it's REV A */ |
809 | int port1, last_port1; /* Register 1 for REV C cards */ | |
810 | int i; | |
811 | int retval; | |
812 | ||
813 | if (debug >= DEBUG) | |
27c766aa | 814 | pr_debug("pcwd_isa_match id=%d\n", id); |
5aa15050 | 815 | |
261dcc70 | 816 | if (!request_region(base_addr, 4, "PCWD")) { |
27c766aa | 817 | pr_info("Port 0x%04x unavailable\n", base_addr); |
5aa15050 WVS |
818 | return 0; |
819 | } | |
820 | ||
821 | retval = 0; | |
822 | ||
823 | port0 = inb_p(base_addr); /* For REV A boards */ | |
824 | port1 = inb_p(base_addr + 1); /* For REV C boards */ | |
825 | if (port0 != 0xff || port1 != 0xff) { | |
826 | /* Not an 'ff' from a floating bus, so must be a card! */ | |
827 | for (i = 0; i < 4; ++i) { | |
828 | ||
829 | msleep(500); | |
830 | ||
831 | last_port0 = port0; | |
832 | last_port1 = port1; | |
833 | ||
834 | port0 = inb_p(base_addr); | |
835 | port1 = inb_p(base_addr + 1); | |
836 | ||
837 | /* Has either hearbeat bit changed? */ | |
838 | if ((port0 ^ last_port0) & WD_HRTBT || | |
839 | (port1 ^ last_port1) & WD_REVC_HRBT) { | |
840 | retval = 1; | |
841 | break; | |
842 | } | |
843 | } | |
844 | } | |
261dcc70 | 845 | release_region(base_addr, 4); |
5aa15050 WVS |
846 | |
847 | return retval; | |
848 | } | |
849 | ||
2d991a16 | 850 | static int pcwd_isa_probe(struct device *dev, unsigned int id) |
1da177e4 LT |
851 | { |
852 | int ret; | |
1da177e4 | 853 | |
5aa15050 | 854 | if (debug >= DEBUG) |
27c766aa | 855 | pr_debug("pcwd_isa_probe id=%d\n", id); |
5aa15050 | 856 | |
1da177e4 LT |
857 | cards_found++; |
858 | if (cards_found == 1) | |
27c766aa | 859 | pr_info("v%s Ken Hollis (kenji@bitgate.com)\n", |
143a2e54 | 860 | WATCHDOG_VERSION); |
1da177e4 LT |
861 | |
862 | if (cards_found > 1) { | |
27c766aa | 863 | pr_err("This driver only supports 1 device\n"); |
1da177e4 LT |
864 | return -ENODEV; |
865 | } | |
866 | ||
5aa15050 | 867 | if (pcwd_ioports[id] == 0x0000) { |
27c766aa | 868 | pr_err("No I/O-Address for card detected\n"); |
1da177e4 LT |
869 | return -ENODEV; |
870 | } | |
5aa15050 WVS |
871 | pcwd_private.io_addr = pcwd_ioports[id]; |
872 | ||
873 | spin_lock_init(&pcwd_private.io_lock); | |
1da177e4 LT |
874 | |
875 | /* Check card's revision */ | |
a2be8786 | 876 | pcwd_private.revision = get_revision(); |
1da177e4 | 877 | |
261dcc70 AC |
878 | if (!request_region(pcwd_private.io_addr, |
879 | (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) { | |
27c766aa JP |
880 | pr_err("I/O address 0x%04x already in use\n", |
881 | pcwd_private.io_addr); | |
261dcc70 | 882 | ret = -EIO; |
5aa15050 | 883 | goto error_request_region; |
1da177e4 LT |
884 | } |
885 | ||
886 | /* Initial variables */ | |
a2be8786 | 887 | pcwd_private.supports_temp = 0; |
1da177e4 | 888 | temp_panic = 0; |
a2be8786 | 889 | pcwd_private.boot_status = 0x0000; |
1da177e4 LT |
890 | |
891 | /* get the boot_status */ | |
a2be8786 | 892 | pcwd_get_status(&pcwd_private.boot_status); |
1da177e4 LT |
893 | |
894 | /* clear the "card caused reboot" flag */ | |
895 | pcwd_clear_status(); | |
896 | ||
e99e88a9 | 897 | timer_setup(&pcwd_private.timer, pcwd_timer_ping, 0); |
1da177e4 LT |
898 | |
899 | /* Disable the board */ | |
900 | pcwd_stop(); | |
901 | ||
902 | /* Check whether or not the card supports the temperature device */ | |
85875211 | 903 | pcwd_check_temperature_support(); |
1da177e4 | 904 | |
af3b38d9 WVS |
905 | /* Show info about the card itself */ |
906 | pcwd_show_card_info(); | |
1da177e4 | 907 | |
f3dc0733 WVS |
908 | /* If heartbeat = 0 then we use the heartbeat from the dip-switches */ |
909 | if (heartbeat == 0) | |
910 | heartbeat = heartbeat_tbl[(pcwd_get_option_switches() & 0x07)]; | |
911 | ||
261dcc70 AC |
912 | /* Check that the heartbeat value is within it's range; |
913 | if not reset to the default */ | |
fd41fa61 WVS |
914 | if (pcwd_set_heartbeat(heartbeat)) { |
915 | pcwd_set_heartbeat(WATCHDOG_HEARTBEAT); | |
27c766aa JP |
916 | pr_info("heartbeat value must be 2 <= heartbeat <= 7200, using %d\n", |
917 | WATCHDOG_HEARTBEAT); | |
1da177e4 LT |
918 | } |
919 | ||
a2be8786 | 920 | if (pcwd_private.supports_temp) { |
1da177e4 LT |
921 | ret = misc_register(&temp_miscdev); |
922 | if (ret) { | |
27c766aa JP |
923 | pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
924 | TEMP_MINOR, ret); | |
5aa15050 | 925 | goto error_misc_register_temp; |
1da177e4 LT |
926 | } |
927 | } | |
928 | ||
929 | ret = misc_register(&pcwd_miscdev); | |
930 | if (ret) { | |
27c766aa JP |
931 | pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
932 | WATCHDOG_MINOR, ret); | |
5aa15050 | 933 | goto error_misc_register_watchdog; |
1da177e4 LT |
934 | } |
935 | ||
27c766aa | 936 | pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n", |
1da177e4 LT |
937 | heartbeat, nowayout); |
938 | ||
939 | return 0; | |
5aa15050 WVS |
940 | |
941 | error_misc_register_watchdog: | |
942 | if (pcwd_private.supports_temp) | |
943 | misc_deregister(&temp_miscdev); | |
944 | error_misc_register_temp: | |
261dcc70 AC |
945 | release_region(pcwd_private.io_addr, |
946 | (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); | |
5aa15050 WVS |
947 | error_request_region: |
948 | pcwd_private.io_addr = 0x0000; | |
949 | cards_found--; | |
950 | return ret; | |
1da177e4 LT |
951 | } |
952 | ||
4b12b896 | 953 | static int pcwd_isa_remove(struct device *dev, unsigned int id) |
1da177e4 | 954 | { |
5aa15050 | 955 | if (debug >= DEBUG) |
27c766aa | 956 | pr_debug("pcwd_isa_remove id=%d\n", id); |
5aa15050 WVS |
957 | |
958 | if (!pcwd_private.io_addr) | |
959 | return 1; | |
960 | ||
1da177e4 LT |
961 | /* Disable the board */ |
962 | if (!nowayout) | |
963 | pcwd_stop(); | |
964 | ||
965 | /* Deregister */ | |
966 | misc_deregister(&pcwd_miscdev); | |
a2be8786 | 967 | if (pcwd_private.supports_temp) |
1da177e4 | 968 | misc_deregister(&temp_miscdev); |
261dcc70 AC |
969 | release_region(pcwd_private.io_addr, |
970 | (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); | |
a2be8786 | 971 | pcwd_private.io_addr = 0x0000; |
f1c3a056 | 972 | cards_found--; |
5aa15050 WVS |
973 | |
974 | return 0; | |
1da177e4 LT |
975 | } |
976 | ||
5aa15050 | 977 | static void pcwd_isa_shutdown(struct device *dev, unsigned int id) |
1da177e4 | 978 | { |
5aa15050 | 979 | if (debug >= DEBUG) |
27c766aa | 980 | pr_debug("pcwd_isa_shutdown id=%d\n", id); |
1da177e4 | 981 | |
5aa15050 | 982 | pcwd_stop(); |
1da177e4 LT |
983 | } |
984 | ||
5aa15050 WVS |
985 | static struct isa_driver pcwd_isa_driver = { |
986 | .match = pcwd_isa_match, | |
987 | .probe = pcwd_isa_probe, | |
82268714 | 988 | .remove = pcwd_isa_remove, |
5aa15050 WVS |
989 | .shutdown = pcwd_isa_shutdown, |
990 | .driver = { | |
991 | .owner = THIS_MODULE, | |
992 | .name = WATCHDOG_NAME, | |
993 | }, | |
994 | }; | |
1da177e4 | 995 | |
b7a8c420 | 996 | module_isa_driver(pcwd_isa_driver, PCWD_ISA_NR_CARDS); |
1da177e4 | 997 | |
143a2e54 WVS |
998 | MODULE_AUTHOR("Ken Hollis <kenji@bitgate.com>, " |
999 | "Wim Van Sebroeck <wim@iguana.be>"); | |
1da177e4 | 1000 | MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver"); |
5aa15050 | 1001 | MODULE_VERSION(WATCHDOG_VERSION); |
1da177e4 | 1002 | MODULE_LICENSE("GPL"); |