Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * PC Watchdog Driver | |
3 | * by Ken Hollis (khollis@bitgate.com) | |
4 | * | |
f9146f26 | 5 | * Permission granted from Simon Machell (smachell@berkprod.com) |
1da177e4 LT |
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. | |
143a2e54 WVS |
27 | * 961006 Revised some documentation, fixed some cosmetic bugs. Made |
28 | * drivers to panic the system if it's overheating at bootup. | |
1da177e4 LT |
29 | * 961118 Changed some verbiage on some of the output, tidied up |
30 | * code bits, and added compatibility to 2.1.x. | |
143a2e54 | 31 | * 970912 Enabled board on open and disable on close. |
1da177e4 | 32 | * 971107 Took account of recent VFS changes (broke read). |
143a2e54 WVS |
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>] | |
1da177e4 LT |
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> | |
261dcc70 AC |
43 | * 011214 Added nowayout module option to override |
44 | * CONFIG_WATCHDOG_NOWAYOUT <Matt_Domsch@dell.com> | |
143a2e54 | 45 | * Added timeout module option to override default |
1da177e4 LT |
46 | */ |
47 | ||
48 | /* | |
49 | * A bells and whistles driver is available from http://www.pcwd.de/ | |
261dcc70 AC |
50 | * More info available at http://www.berkprod.com/ or |
51 | * http://www.pcwatchdog.com/ | |
1da177e4 LT |
52 | */ |
53 | ||
27c766aa JP |
54 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
55 | ||
fd41fa61 WVS |
56 | #include <linux/module.h> /* For module specific items */ |
57 | #include <linux/moduleparam.h> /* For new moduleparam's */ | |
58 | #include <linux/types.h> /* For standard types (like size_t) */ | |
59 | #include <linux/errno.h> /* For the -ENODEV/... values */ | |
60 | #include <linux/kernel.h> /* For printk/panic/... */ | |
61 | #include <linux/delay.h> /* For mdelay function */ | |
62 | #include <linux/timer.h> /* For timer related operations */ | |
63 | #include <linux/jiffies.h> /* For jiffies stuff */ | |
64 | #include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */ | |
65 | #include <linux/watchdog.h> /* For the watchdog specific items */ | |
5aa15050 | 66 | #include <linux/reboot.h> /* For kernel_power_off() */ |
fd41fa61 WVS |
67 | #include <linux/init.h> /* For __init/__exit/... */ |
68 | #include <linux/fs.h> /* For file operations */ | |
5aa15050 | 69 | #include <linux/isa.h> /* For isa devices */ |
fd41fa61 WVS |
70 | #include <linux/ioport.h> /* For io-port access */ |
71 | #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */ | |
261dcc70 AC |
72 | #include <linux/uaccess.h> /* For copy_to_user/put_user/... */ |
73 | #include <linux/io.h> /* For inb/outb/... */ | |
fd41fa61 WVS |
74 | |
75 | /* Module and version information */ | |
5aa15050 WVS |
76 | #define WATCHDOG_VERSION "1.20" |
77 | #define WATCHDOG_DATE "18 Feb 2007" | |
a7122f91 WVS |
78 | #define WATCHDOG_DRIVER_NAME "ISA-PC Watchdog" |
79 | #define WATCHDOG_NAME "pcwd" | |
143a2e54 | 80 | #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION "\n" |
1da177e4 LT |
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 | ||
5aa15050 WVS |
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 | ||
1da177e4 | 101 | /* |
8f0235dc WVS |
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. */ | |
4206f0c4 WVS |
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 */ | |
8f0235dc | 111 | /* Port 1 : Control Status #1 for the PC Watchdog card, revision C. */ |
4206f0c4 WVS |
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 */ | |
261dcc70 AC |
115 | #define WD_REVC_RL2A 0x08 /* Relay 2 activated by |
116 | on-board processor */ | |
4206f0c4 WVS |
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? */ | |
8f0235dc WVS |
120 | /* Port 2 : Control Status #2 */ |
121 | #define WD_WDIS 0x10 /* Watchdog Disabled */ | |
122 | #define WD_ENTP 0x20 /* Watchdog Enable Temperature Trip */ | |
261dcc70 AC |
123 | #define WD_SSEL 0x40 /* Watchdog Switch Select |
124 | (1:SW1 <-> 0:SW2) */ | |
8f0235dc | 125 | #define WD_WCMD 0x80 /* Watchdog Command Mode */ |
1da177e4 LT |
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 */ | |
fd41fa61 WVS |
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 | |
369fa252 WVS |
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 | |
fd41fa61 WVS |
142 | #define CMD_ISA_DELAY_TIME_2SECS 0x0A |
143 | #define CMD_ISA_DELAY_TIME_4SECS 0x0B | |
144 | #define CMD_ISA_DELAY_TIME_8SECS 0x0C | |
369fa252 | 145 | #define CMD_ISA_RESET_RELAYS 0x0D |
1da177e4 | 146 | |
f3dc0733 | 147 | /* Watchdog's Dip Switch heartbeat values */ |
7944d3a5 | 148 | static const int heartbeat_tbl[] = { |
f3dc0733 WVS |
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 | ||
1da177e4 LT |
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 */ | |
36cbaa87 | 171 | static unsigned long open_allowed; |
1da177e4 | 172 | static char expect_close; |
1da177e4 | 173 | static int temp_panic; |
261dcc70 AC |
174 | |
175 | /* this is private data for each ISA-PC watchdog card */ | |
176 | static struct { | |
2891b6ad | 177 | char fw_ver_str[6]; /* The cards firmware version */ |
a2be8786 | 178 | int revision; /* The card's revision */ |
261dcc70 AC |
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 */ | |
a2be8786 WVS |
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; | |
1da177e4 LT |
189 | |
190 | /* module parameters */ | |
c324ab42 WVS |
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); | |
261dcc70 AC |
196 | MODULE_PARM_DESC(debug, |
197 | "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)"); | |
c324ab42 | 198 | |
261dcc70 AC |
199 | /* default heartbeat = delay-time from dip-switches */ |
200 | #define WATCHDOG_HEARTBEAT 0 | |
1da177e4 LT |
201 | static int heartbeat = WATCHDOG_HEARTBEAT; |
202 | module_param(heartbeat, int, 0); | |
143a2e54 WVS |
203 | MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. " |
204 | "(2 <= heartbeat <= 7200 or 0=delay-time from dip-switches, default=" | |
205 | __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); | |
1da177e4 | 206 | |
86a1e189 WVS |
207 | static bool nowayout = WATCHDOG_NOWAYOUT; |
208 | module_param(nowayout, bool, 0); | |
261dcc70 AC |
209 | MODULE_PARM_DESC(nowayout, |
210 | "Watchdog cannot be stopped once started (default=" | |
211 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
1da177e4 LT |
212 | |
213 | /* | |
214 | * Internal functions | |
215 | */ | |
216 | ||
217 | static int send_isa_command(int cmd) | |
218 | { | |
219 | int i; | |
220 | int control_status; | |
221 | int port0, last_port0; /* Double read for stabilising */ | |
222 | ||
c324ab42 | 223 | if (debug >= DEBUG) |
27c766aa | 224 | pr_debug("sending following data cmd=0x%02x\n", cmd); |
c324ab42 | 225 | |
1da177e4 | 226 | /* The WCMD bit must be 1 and the command is only 4 bits in size */ |
8f0235dc | 227 | control_status = (cmd & 0x0F) | WD_WCMD; |
a2be8786 | 228 | outb_p(control_status, pcwd_private.io_addr + 2); |
1da177e4 LT |
229 | udelay(ISA_COMMAND_TIMEOUT); |
230 | ||
a2be8786 | 231 | port0 = inb_p(pcwd_private.io_addr); |
1da177e4 LT |
232 | for (i = 0; i < 25; ++i) { |
233 | last_port0 = port0; | |
a2be8786 | 234 | port0 = inb_p(pcwd_private.io_addr); |
1da177e4 LT |
235 | |
236 | if (port0 == last_port0) | |
237 | break; /* Data is stable */ | |
238 | ||
261dcc70 | 239 | udelay(250); |
1da177e4 LT |
240 | } |
241 | ||
c324ab42 | 242 | if (debug >= DEBUG) |
27c766aa JP |
243 | pr_debug("received following data for cmd=0x%02x: port0=0x%02x last_port0=0x%02x\n", |
244 | cmd, port0, last_port0); | |
c324ab42 | 245 | |
1da177e4 LT |
246 | return port0; |
247 | } | |
248 | ||
249 | static int set_command_mode(void) | |
250 | { | |
261dcc70 | 251 | int i, found = 0, count = 0; |
1da177e4 LT |
252 | |
253 | /* Set the card into command mode */ | |
a2be8786 | 254 | spin_lock(&pcwd_private.io_lock); |
1da177e4 LT |
255 | while ((!found) && (count < 3)) { |
256 | i = send_isa_command(CMD_ISA_IDLE); | |
257 | ||
258 | if (i == 0x00) | |
259 | found = 1; | |
260 | else if (i == 0xF3) { | |
261 | /* Card does not like what we've done to it */ | |
a2be8786 | 262 | outb_p(0x00, pcwd_private.io_addr + 2); |
1da177e4 | 263 | udelay(1200); /* Spec says wait 1ms */ |
a2be8786 | 264 | outb_p(0x00, pcwd_private.io_addr + 2); |
1da177e4 LT |
265 | udelay(ISA_COMMAND_TIMEOUT); |
266 | } | |
267 | count++; | |
268 | } | |
a2be8786 WVS |
269 | spin_unlock(&pcwd_private.io_lock); |
270 | pcwd_private.command_mode = found; | |
1da177e4 | 271 | |
c324ab42 | 272 | if (debug >= DEBUG) |
27c766aa | 273 | pr_debug("command_mode=%d\n", pcwd_private.command_mode); |
c324ab42 | 274 | |
7944d3a5 | 275 | return found; |
1da177e4 LT |
276 | } |
277 | ||
278 | static void unset_command_mode(void) | |
279 | { | |
280 | /* Set the card into normal mode */ | |
a2be8786 WVS |
281 | spin_lock(&pcwd_private.io_lock); |
282 | outb_p(0x00, pcwd_private.io_addr + 2); | |
1da177e4 | 283 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 | 284 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 | 285 | |
a2be8786 | 286 | pcwd_private.command_mode = 0; |
c324ab42 WVS |
287 | |
288 | if (debug >= DEBUG) | |
27c766aa | 289 | pr_debug("command_mode=%d\n", pcwd_private.command_mode); |
1da177e4 LT |
290 | } |
291 | ||
85875211 WVS |
292 | static inline void pcwd_check_temperature_support(void) |
293 | { | |
294 | if (inb(pcwd_private.io_addr) != 0xF0) | |
295 | pcwd_private.supports_temp = 1; | |
296 | } | |
297 | ||
2891b6ad | 298 | static inline void pcwd_get_firmware(void) |
af3b38d9 WVS |
299 | { |
300 | int one, ten, hund, minor; | |
af3b38d9 | 301 | |
6bbc20bc | 302 | strcpy(pcwd_private.fw_ver_str, "ERROR"); |
af3b38d9 WVS |
303 | |
304 | if (set_command_mode()) { | |
305 | one = send_isa_command(CMD_ISA_VERSION_INTEGER); | |
306 | ten = send_isa_command(CMD_ISA_VERSION_TENTH); | |
307 | hund = send_isa_command(CMD_ISA_VERSION_HUNDRETH); | |
308 | minor = send_isa_command(CMD_ISA_VERSION_MINOR); | |
261dcc70 AC |
309 | sprintf(pcwd_private.fw_ver_str, "%c.%c%c%c", |
310 | one, ten, hund, minor); | |
af3b38d9 | 311 | } |
af3b38d9 | 312 | unset_command_mode(); |
2891b6ad WVS |
313 | |
314 | return; | |
af3b38d9 WVS |
315 | } |
316 | ||
317 | static inline int pcwd_get_option_switches(void) | |
318 | { | |
261dcc70 | 319 | int option_switches = 0; |
af3b38d9 WVS |
320 | |
321 | if (set_command_mode()) { | |
322 | /* Get switch settings */ | |
323 | option_switches = send_isa_command(CMD_ISA_SWITCH_SETTINGS); | |
324 | } | |
325 | ||
326 | unset_command_mode(); | |
7944d3a5 | 327 | return option_switches; |
af3b38d9 WVS |
328 | } |
329 | ||
330 | static void pcwd_show_card_info(void) | |
331 | { | |
af3b38d9 WVS |
332 | int option_switches; |
333 | ||
334 | /* Get some extra info from the hardware (in command/debug/diag mode) */ | |
335 | if (pcwd_private.revision == PCWD_REVISION_A) | |
27c766aa JP |
336 | pr_info("ISA-PC Watchdog (REV.A) detected at port 0x%04x\n", |
337 | pcwd_private.io_addr); | |
af3b38d9 | 338 | else if (pcwd_private.revision == PCWD_REVISION_C) { |
2891b6ad | 339 | pcwd_get_firmware(); |
27c766aa | 340 | pr_info("ISA-PC Watchdog (REV.C) detected at port 0x%04x (Firmware version: %s)\n", |
2891b6ad | 341 | pcwd_private.io_addr, pcwd_private.fw_ver_str); |
af3b38d9 | 342 | option_switches = pcwd_get_option_switches(); |
27c766aa | 343 | pr_info("Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n", |
af3b38d9 WVS |
344 | option_switches, |
345 | ((option_switches & 0x10) ? "ON" : "OFF"), | |
346 | ((option_switches & 0x08) ? "ON" : "OFF")); | |
347 | ||
348 | /* Reprogram internal heartbeat to 2 seconds */ | |
349 | if (set_command_mode()) { | |
350 | send_isa_command(CMD_ISA_DELAY_TIME_2SECS); | |
351 | unset_command_mode(); | |
352 | } | |
353 | } | |
354 | ||
355 | if (pcwd_private.supports_temp) | |
27c766aa | 356 | pr_info("Temperature Option Detected\n"); |
af3b38d9 WVS |
357 | |
358 | if (pcwd_private.boot_status & WDIOF_CARDRESET) | |
27c766aa | 359 | pr_info("Previous reboot was caused by the card\n"); |
af3b38d9 WVS |
360 | |
361 | if (pcwd_private.boot_status & WDIOF_OVERHEAT) { | |
27c766aa JP |
362 | pr_emerg("Card senses a CPU Overheat. Panicking!\n"); |
363 | pr_emerg("CPU Overheat\n"); | |
af3b38d9 WVS |
364 | } |
365 | ||
366 | if (pcwd_private.boot_status == 0) | |
27c766aa | 367 | pr_info("No previous trip detected - Cold boot or reset\n"); |
af3b38d9 WVS |
368 | } |
369 | ||
1da177e4 LT |
370 | static void pcwd_timer_ping(unsigned long data) |
371 | { | |
372 | int wdrst_stat; | |
373 | ||
374 | /* If we got a heartbeat pulse within the WDT_INTERVAL | |
375 | * we agree to ping the WDT */ | |
261dcc70 | 376 | if (time_before(jiffies, pcwd_private.next_heartbeat)) { |
1da177e4 | 377 | /* Ping the watchdog */ |
a2be8786 WVS |
378 | spin_lock(&pcwd_private.io_lock); |
379 | if (pcwd_private.revision == PCWD_REVISION_A) { | |
261dcc70 AC |
380 | /* Rev A cards are reset by setting the |
381 | WD_WDRST bit in register 1 */ | |
a2be8786 | 382 | wdrst_stat = inb_p(pcwd_private.io_addr); |
1da177e4 LT |
383 | wdrst_stat &= 0x0F; |
384 | wdrst_stat |= WD_WDRST; | |
385 | ||
a2be8786 | 386 | outb_p(wdrst_stat, pcwd_private.io_addr + 1); |
1da177e4 LT |
387 | } else { |
388 | /* Re-trigger watchdog by writing to port 0 */ | |
a2be8786 | 389 | outb_p(0x00, pcwd_private.io_addr); |
1da177e4 LT |
390 | } |
391 | ||
392 | /* Re-set the timer interval */ | |
a2be8786 | 393 | mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); |
1da177e4 | 394 | |
a2be8786 | 395 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 | 396 | } else { |
27c766aa | 397 | pr_warn("Heartbeat lost! Will not ping the watchdog\n"); |
1da177e4 LT |
398 | } |
399 | } | |
400 | ||
401 | static int pcwd_start(void) | |
402 | { | |
403 | int stat_reg; | |
404 | ||
a2be8786 | 405 | pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); |
1da177e4 LT |
406 | |
407 | /* Start the timer */ | |
a2be8786 | 408 | mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); |
1da177e4 LT |
409 | |
410 | /* Enable the port */ | |
a2be8786 WVS |
411 | if (pcwd_private.revision == PCWD_REVISION_C) { |
412 | spin_lock(&pcwd_private.io_lock); | |
413 | outb_p(0x00, pcwd_private.io_addr + 3); | |
1da177e4 | 414 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 WVS |
415 | stat_reg = inb_p(pcwd_private.io_addr + 2); |
416 | spin_unlock(&pcwd_private.io_lock); | |
8f0235dc | 417 | if (stat_reg & WD_WDIS) { |
27c766aa | 418 | pr_info("Could not start watchdog\n"); |
1da177e4 LT |
419 | return -EIO; |
420 | } | |
421 | } | |
c324ab42 WVS |
422 | |
423 | if (debug >= VERBOSE) | |
27c766aa | 424 | pr_debug("Watchdog started\n"); |
c324ab42 | 425 | |
1da177e4 LT |
426 | return 0; |
427 | } | |
428 | ||
429 | static int pcwd_stop(void) | |
430 | { | |
431 | int stat_reg; | |
432 | ||
433 | /* Stop the timer */ | |
a2be8786 | 434 | del_timer(&pcwd_private.timer); |
1da177e4 LT |
435 | |
436 | /* Disable the board */ | |
a2be8786 WVS |
437 | if (pcwd_private.revision == PCWD_REVISION_C) { |
438 | spin_lock(&pcwd_private.io_lock); | |
439 | outb_p(0xA5, pcwd_private.io_addr + 3); | |
1da177e4 | 440 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 | 441 | outb_p(0xA5, pcwd_private.io_addr + 3); |
1da177e4 | 442 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 WVS |
443 | stat_reg = inb_p(pcwd_private.io_addr + 2); |
444 | spin_unlock(&pcwd_private.io_lock); | |
8f0235dc | 445 | if ((stat_reg & WD_WDIS) == 0) { |
27c766aa | 446 | pr_info("Could not stop watchdog\n"); |
1da177e4 LT |
447 | return -EIO; |
448 | } | |
449 | } | |
c324ab42 WVS |
450 | |
451 | if (debug >= VERBOSE) | |
27c766aa | 452 | pr_debug("Watchdog stopped\n"); |
c324ab42 | 453 | |
1da177e4 LT |
454 | return 0; |
455 | } | |
456 | ||
457 | static int pcwd_keepalive(void) | |
458 | { | |
459 | /* user land ping */ | |
a2be8786 | 460 | pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); |
c324ab42 WVS |
461 | |
462 | if (debug >= DEBUG) | |
27c766aa | 463 | pr_debug("Watchdog keepalive signal send\n"); |
c324ab42 | 464 | |
1da177e4 LT |
465 | return 0; |
466 | } | |
467 | ||
468 | static int pcwd_set_heartbeat(int t) | |
469 | { | |
261dcc70 | 470 | if (t < 2 || t > 7200) /* arbitrary upper limit */ |
1da177e4 LT |
471 | return -EINVAL; |
472 | ||
473 | heartbeat = t; | |
c324ab42 WVS |
474 | |
475 | if (debug >= VERBOSE) | |
27c766aa | 476 | pr_debug("New heartbeat: %d\n", heartbeat); |
c324ab42 | 477 | |
1da177e4 LT |
478 | return 0; |
479 | } | |
480 | ||
481 | static int pcwd_get_status(int *status) | |
482 | { | |
4206f0c4 | 483 | int control_status; |
1da177e4 | 484 | |
261dcc70 | 485 | *status = 0; |
a2be8786 WVS |
486 | spin_lock(&pcwd_private.io_lock); |
487 | if (pcwd_private.revision == PCWD_REVISION_A) | |
1da177e4 LT |
488 | /* Rev A cards return status information from |
489 | * the base register, which is used for the | |
490 | * temperature in other cards. */ | |
4206f0c4 | 491 | control_status = inb(pcwd_private.io_addr); |
1da177e4 LT |
492 | else { |
493 | /* Rev C cards return card status in the base | |
494 | * address + 1 register. And use different bits | |
495 | * to indicate a card initiated reset, and an | |
496 | * over-temperature condition. And the reboot | |
497 | * status can be reset. */ | |
4206f0c4 | 498 | control_status = inb(pcwd_private.io_addr + 1); |
1da177e4 | 499 | } |
a2be8786 | 500 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 | 501 | |
a2be8786 | 502 | if (pcwd_private.revision == PCWD_REVISION_A) { |
4206f0c4 | 503 | if (control_status & WD_WDRST) |
1da177e4 LT |
504 | *status |= WDIOF_CARDRESET; |
505 | ||
4206f0c4 | 506 | if (control_status & WD_T110) { |
1da177e4 LT |
507 | *status |= WDIOF_OVERHEAT; |
508 | if (temp_panic) { | |
27c766aa | 509 | pr_info("Temperature overheat trip!\n"); |
68acc05d | 510 | kernel_power_off(); |
1da177e4 LT |
511 | } |
512 | } | |
513 | } else { | |
4206f0c4 | 514 | if (control_status & WD_REVC_WTRP) |
1da177e4 LT |
515 | *status |= WDIOF_CARDRESET; |
516 | ||
4206f0c4 | 517 | if (control_status & WD_REVC_TTRP) { |
1da177e4 LT |
518 | *status |= WDIOF_OVERHEAT; |
519 | if (temp_panic) { | |
27c766aa | 520 | pr_info("Temperature overheat trip!\n"); |
68acc05d | 521 | kernel_power_off(); |
1da177e4 LT |
522 | } |
523 | } | |
524 | } | |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
529 | static int pcwd_clear_status(void) | |
530 | { | |
4206f0c4 WVS |
531 | int control_status; |
532 | ||
a2be8786 WVS |
533 | if (pcwd_private.revision == PCWD_REVISION_C) { |
534 | spin_lock(&pcwd_private.io_lock); | |
4206f0c4 | 535 | |
c324ab42 | 536 | if (debug >= VERBOSE) |
27c766aa | 537 | pr_info("clearing watchdog trip status\n"); |
c324ab42 | 538 | |
4206f0c4 WVS |
539 | control_status = inb_p(pcwd_private.io_addr + 1); |
540 | ||
c324ab42 | 541 | if (debug >= DEBUG) { |
27c766aa JP |
542 | pr_debug("status was: 0x%02x\n", control_status); |
543 | pr_debug("sending: 0x%02x\n", | |
544 | (control_status & WD_REVC_R2DS)); | |
c324ab42 WVS |
545 | } |
546 | ||
4206f0c4 | 547 | /* clear reset status & Keep Relay 2 disable state as it is */ |
261dcc70 AC |
548 | outb_p((control_status & WD_REVC_R2DS), |
549 | pcwd_private.io_addr + 1); | |
4206f0c4 | 550 | |
a2be8786 | 551 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 LT |
552 | } |
553 | return 0; | |
554 | } | |
555 | ||
556 | static int pcwd_get_temperature(int *temperature) | |
557 | { | |
558 | /* check that port 0 gives temperature info and no command results */ | |
a2be8786 | 559 | if (pcwd_private.command_mode) |
1da177e4 LT |
560 | return -1; |
561 | ||
562 | *temperature = 0; | |
a2be8786 | 563 | if (!pcwd_private.supports_temp) |
1da177e4 LT |
564 | return -ENODEV; |
565 | ||
566 | /* | |
567 | * Convert celsius to fahrenheit, since this was | |
568 | * the decided 'standard' for this return value. | |
569 | */ | |
a2be8786 WVS |
570 | spin_lock(&pcwd_private.io_lock); |
571 | *temperature = ((inb(pcwd_private.io_addr)) * 9 / 5) + 32; | |
572 | spin_unlock(&pcwd_private.io_lock); | |
1da177e4 | 573 | |
c324ab42 | 574 | if (debug >= DEBUG) { |
27c766aa | 575 | pr_debug("temperature is: %d F\n", *temperature); |
c324ab42 WVS |
576 | } |
577 | ||
1da177e4 LT |
578 | return 0; |
579 | } | |
580 | ||
581 | /* | |
582 | * /dev/watchdog handling | |
583 | */ | |
584 | ||
261dcc70 | 585 | static long pcwd_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
586 | { |
587 | int rv; | |
588 | int status; | |
589 | int temperature; | |
590 | int new_heartbeat; | |
591 | int __user *argp = (int __user *)arg; | |
42747d71 | 592 | static const struct watchdog_info ident = { |
1da177e4 LT |
593 | .options = WDIOF_OVERHEAT | |
594 | WDIOF_CARDRESET | | |
595 | WDIOF_KEEPALIVEPING | | |
596 | WDIOF_SETTIMEOUT | | |
597 | WDIOF_MAGICCLOSE, | |
598 | .firmware_version = 1, | |
599 | .identity = "PCWD", | |
600 | }; | |
601 | ||
261dcc70 | 602 | switch (cmd) { |
1da177e4 | 603 | case WDIOC_GETSUPPORT: |
261dcc70 | 604 | if (copy_to_user(argp, &ident, sizeof(ident))) |
1da177e4 LT |
605 | return -EFAULT; |
606 | return 0; | |
607 | ||
608 | case WDIOC_GETSTATUS: | |
609 | pcwd_get_status(&status); | |
610 | return put_user(status, argp); | |
611 | ||
612 | case WDIOC_GETBOOTSTATUS: | |
a2be8786 | 613 | return put_user(pcwd_private.boot_status, argp); |
1da177e4 LT |
614 | |
615 | case WDIOC_GETTEMP: | |
616 | if (pcwd_get_temperature(&temperature)) | |
617 | return -EFAULT; | |
618 | ||
619 | return put_user(temperature, argp); | |
620 | ||
621 | case WDIOC_SETOPTIONS: | |
261dcc70 AC |
622 | if (pcwd_private.revision == PCWD_REVISION_C) { |
623 | if (get_user(rv, argp)) | |
1da177e4 LT |
624 | return -EFAULT; |
625 | ||
261dcc70 AC |
626 | if (rv & WDIOS_DISABLECARD) { |
627 | status = pcwd_stop(); | |
628 | if (status < 0) | |
629 | return status; | |
1da177e4 | 630 | } |
261dcc70 AC |
631 | if (rv & WDIOS_ENABLECARD) { |
632 | status = pcwd_start(); | |
633 | if (status < 0) | |
634 | return status; | |
1da177e4 | 635 | } |
1da177e4 | 636 | if (rv & WDIOS_TEMPPANIC) |
1da177e4 | 637 | temp_panic = 1; |
1da177e4 LT |
638 | } |
639 | return -EINVAL; | |
640 | ||
641 | case WDIOC_KEEPALIVE: | |
642 | pcwd_keepalive(); | |
643 | return 0; | |
644 | ||
645 | case WDIOC_SETTIMEOUT: | |
646 | if (get_user(new_heartbeat, argp)) | |
647 | return -EFAULT; | |
648 | ||
649 | if (pcwd_set_heartbeat(new_heartbeat)) | |
650 | return -EINVAL; | |
651 | ||
652 | pcwd_keepalive(); | |
653 | /* Fall */ | |
654 | ||
655 | case WDIOC_GETTIMEOUT: | |
656 | return put_user(heartbeat, argp); | |
0c06090c WVS |
657 | |
658 | default: | |
659 | return -ENOTTY; | |
1da177e4 LT |
660 | } |
661 | ||
662 | return 0; | |
663 | } | |
664 | ||
665 | static ssize_t pcwd_write(struct file *file, const char __user *buf, size_t len, | |
666 | loff_t *ppos) | |
667 | { | |
668 | if (len) { | |
669 | if (!nowayout) { | |
670 | size_t i; | |
671 | ||
672 | /* In case it was set long ago */ | |
673 | expect_close = 0; | |
674 | ||
675 | for (i = 0; i != len; i++) { | |
676 | char c; | |
677 | ||
678 | if (get_user(c, buf + i)) | |
679 | return -EFAULT; | |
680 | if (c == 'V') | |
681 | expect_close = 42; | |
682 | } | |
683 | } | |
684 | pcwd_keepalive(); | |
685 | } | |
686 | return len; | |
687 | } | |
688 | ||
689 | static int pcwd_open(struct inode *inode, struct file *file) | |
690 | { | |
261dcc70 | 691 | if (test_and_set_bit(0, &open_allowed)) |
1da177e4 | 692 | return -EBUSY; |
1da177e4 LT |
693 | if (nowayout) |
694 | __module_get(THIS_MODULE); | |
1da177e4 LT |
695 | /* Activate */ |
696 | pcwd_start(); | |
697 | pcwd_keepalive(); | |
698 | return nonseekable_open(inode, file); | |
699 | } | |
700 | ||
701 | static int pcwd_close(struct inode *inode, struct file *file) | |
702 | { | |
261dcc70 | 703 | if (expect_close == 42) |
1da177e4 | 704 | pcwd_stop(); |
261dcc70 | 705 | else { |
27c766aa | 706 | pr_crit("Unexpected close, not stopping watchdog!\n"); |
1da177e4 LT |
707 | pcwd_keepalive(); |
708 | } | |
709 | expect_close = 0; | |
261dcc70 | 710 | clear_bit(0, &open_allowed); |
1da177e4 LT |
711 | return 0; |
712 | } | |
713 | ||
714 | /* | |
715 | * /dev/temperature handling | |
716 | */ | |
717 | ||
718 | static ssize_t pcwd_temp_read(struct file *file, char __user *buf, size_t count, | |
719 | loff_t *ppos) | |
720 | { | |
721 | int temperature; | |
722 | ||
723 | if (pcwd_get_temperature(&temperature)) | |
724 | return -EFAULT; | |
725 | ||
726 | if (copy_to_user(buf, &temperature, 1)) | |
727 | return -EFAULT; | |
728 | ||
729 | return 1; | |
730 | } | |
731 | ||
732 | static int pcwd_temp_open(struct inode *inode, struct file *file) | |
733 | { | |
a2be8786 | 734 | if (!pcwd_private.supports_temp) |
1da177e4 LT |
735 | return -ENODEV; |
736 | ||
737 | return nonseekable_open(inode, file); | |
738 | } | |
739 | ||
740 | static int pcwd_temp_close(struct inode *inode, struct file *file) | |
741 | { | |
742 | return 0; | |
743 | } | |
744 | ||
1da177e4 LT |
745 | /* |
746 | * Kernel Interfaces | |
747 | */ | |
748 | ||
62322d25 | 749 | static const struct file_operations pcwd_fops = { |
1da177e4 LT |
750 | .owner = THIS_MODULE, |
751 | .llseek = no_llseek, | |
752 | .write = pcwd_write, | |
261dcc70 | 753 | .unlocked_ioctl = pcwd_ioctl, |
1da177e4 LT |
754 | .open = pcwd_open, |
755 | .release = pcwd_close, | |
756 | }; | |
757 | ||
758 | static struct miscdevice pcwd_miscdev = { | |
759 | .minor = WATCHDOG_MINOR, | |
760 | .name = "watchdog", | |
761 | .fops = &pcwd_fops, | |
762 | }; | |
763 | ||
62322d25 | 764 | static const struct file_operations pcwd_temp_fops = { |
1da177e4 LT |
765 | .owner = THIS_MODULE, |
766 | .llseek = no_llseek, | |
767 | .read = pcwd_temp_read, | |
768 | .open = pcwd_temp_open, | |
769 | .release = pcwd_temp_close, | |
770 | }; | |
771 | ||
772 | static struct miscdevice temp_miscdev = { | |
773 | .minor = TEMP_MINOR, | |
774 | .name = "temperature", | |
775 | .fops = &pcwd_temp_fops, | |
776 | }; | |
777 | ||
1da177e4 LT |
778 | /* |
779 | * Init & exit routines | |
780 | */ | |
781 | ||
1da177e4 LT |
782 | static inline int get_revision(void) |
783 | { | |
784 | int r = PCWD_REVISION_C; | |
785 | ||
a2be8786 | 786 | spin_lock(&pcwd_private.io_lock); |
1da177e4 LT |
787 | /* REV A cards use only 2 io ports; test |
788 | * presumes a floating bus reads as 0xff. */ | |
a2be8786 WVS |
789 | if ((inb(pcwd_private.io_addr + 2) == 0xFF) || |
790 | (inb(pcwd_private.io_addr + 3) == 0xFF)) | |
261dcc70 | 791 | r = PCWD_REVISION_A; |
a2be8786 | 792 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 LT |
793 | |
794 | return r; | |
795 | } | |
796 | ||
5aa15050 WVS |
797 | /* |
798 | * The ISA cards have a heartbeat bit in one of the registers, which | |
799 | * register is card dependent. The heartbeat bit is monitored, and if | |
800 | * found, is considered proof that a Berkshire card has been found. | |
801 | * The initial rate is once per second at board start up, then twice | |
802 | * per second for normal operation. | |
803 | */ | |
804 | static int __devinit pcwd_isa_match(struct device *dev, unsigned int id) | |
805 | { | |
261dcc70 | 806 | int base_addr = pcwd_ioports[id]; |
5aa15050 WVS |
807 | int port0, last_port0; /* Reg 0, in case it's REV A */ |
808 | int port1, last_port1; /* Register 1 for REV C cards */ | |
809 | int i; | |
810 | int retval; | |
811 | ||
812 | if (debug >= DEBUG) | |
27c766aa | 813 | pr_debug("pcwd_isa_match id=%d\n", id); |
5aa15050 | 814 | |
261dcc70 | 815 | if (!request_region(base_addr, 4, "PCWD")) { |
27c766aa | 816 | pr_info("Port 0x%04x unavailable\n", base_addr); |
5aa15050 WVS |
817 | return 0; |
818 | } | |
819 | ||
820 | retval = 0; | |
821 | ||
822 | port0 = inb_p(base_addr); /* For REV A boards */ | |
823 | port1 = inb_p(base_addr + 1); /* For REV C boards */ | |
824 | if (port0 != 0xff || port1 != 0xff) { | |
825 | /* Not an 'ff' from a floating bus, so must be a card! */ | |
826 | for (i = 0; i < 4; ++i) { | |
827 | ||
828 | msleep(500); | |
829 | ||
830 | last_port0 = port0; | |
831 | last_port1 = port1; | |
832 | ||
833 | port0 = inb_p(base_addr); | |
834 | port1 = inb_p(base_addr + 1); | |
835 | ||
836 | /* Has either hearbeat bit changed? */ | |
837 | if ((port0 ^ last_port0) & WD_HRTBT || | |
838 | (port1 ^ last_port1) & WD_REVC_HRBT) { | |
839 | retval = 1; | |
840 | break; | |
841 | } | |
842 | } | |
843 | } | |
261dcc70 | 844 | release_region(base_addr, 4); |
5aa15050 WVS |
845 | |
846 | return retval; | |
847 | } | |
848 | ||
849 | static int __devinit pcwd_isa_probe(struct device *dev, unsigned int id) | |
1da177e4 LT |
850 | { |
851 | int ret; | |
1da177e4 | 852 | |
5aa15050 | 853 | if (debug >= DEBUG) |
27c766aa | 854 | pr_debug("pcwd_isa_probe id=%d\n", id); |
5aa15050 | 855 | |
1da177e4 LT |
856 | cards_found++; |
857 | if (cards_found == 1) | |
27c766aa | 858 | pr_info("v%s Ken Hollis (kenji@bitgate.com)\n", |
143a2e54 | 859 | WATCHDOG_VERSION); |
1da177e4 LT |
860 | |
861 | if (cards_found > 1) { | |
27c766aa | 862 | pr_err("This driver only supports 1 device\n"); |
1da177e4 LT |
863 | return -ENODEV; |
864 | } | |
865 | ||
5aa15050 | 866 | if (pcwd_ioports[id] == 0x0000) { |
27c766aa | 867 | pr_err("No I/O-Address for card detected\n"); |
1da177e4 LT |
868 | return -ENODEV; |
869 | } | |
5aa15050 WVS |
870 | pcwd_private.io_addr = pcwd_ioports[id]; |
871 | ||
872 | spin_lock_init(&pcwd_private.io_lock); | |
1da177e4 LT |
873 | |
874 | /* Check card's revision */ | |
a2be8786 | 875 | pcwd_private.revision = get_revision(); |
1da177e4 | 876 | |
261dcc70 AC |
877 | if (!request_region(pcwd_private.io_addr, |
878 | (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) { | |
27c766aa JP |
879 | pr_err("I/O address 0x%04x already in use\n", |
880 | pcwd_private.io_addr); | |
261dcc70 | 881 | ret = -EIO; |
5aa15050 | 882 | goto error_request_region; |
1da177e4 LT |
883 | } |
884 | ||
885 | /* Initial variables */ | |
a2be8786 | 886 | pcwd_private.supports_temp = 0; |
1da177e4 | 887 | temp_panic = 0; |
a2be8786 | 888 | pcwd_private.boot_status = 0x0000; |
1da177e4 LT |
889 | |
890 | /* get the boot_status */ | |
a2be8786 | 891 | pcwd_get_status(&pcwd_private.boot_status); |
1da177e4 LT |
892 | |
893 | /* clear the "card caused reboot" flag */ | |
894 | pcwd_clear_status(); | |
895 | ||
82eb7c50 | 896 | setup_timer(&pcwd_private.timer, pcwd_timer_ping, 0); |
1da177e4 LT |
897 | |
898 | /* Disable the board */ | |
899 | pcwd_stop(); | |
900 | ||
901 | /* Check whether or not the card supports the temperature device */ | |
85875211 | 902 | pcwd_check_temperature_support(); |
1da177e4 | 903 | |
af3b38d9 WVS |
904 | /* Show info about the card itself */ |
905 | pcwd_show_card_info(); | |
1da177e4 | 906 | |
f3dc0733 WVS |
907 | /* If heartbeat = 0 then we use the heartbeat from the dip-switches */ |
908 | if (heartbeat == 0) | |
909 | heartbeat = heartbeat_tbl[(pcwd_get_option_switches() & 0x07)]; | |
910 | ||
261dcc70 AC |
911 | /* Check that the heartbeat value is within it's range; |
912 | if not reset to the default */ | |
fd41fa61 WVS |
913 | if (pcwd_set_heartbeat(heartbeat)) { |
914 | pcwd_set_heartbeat(WATCHDOG_HEARTBEAT); | |
27c766aa JP |
915 | pr_info("heartbeat value must be 2 <= heartbeat <= 7200, using %d\n", |
916 | WATCHDOG_HEARTBEAT); | |
1da177e4 LT |
917 | } |
918 | ||
a2be8786 | 919 | if (pcwd_private.supports_temp) { |
1da177e4 LT |
920 | ret = misc_register(&temp_miscdev); |
921 | if (ret) { | |
27c766aa JP |
922 | pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
923 | TEMP_MINOR, ret); | |
5aa15050 | 924 | goto error_misc_register_temp; |
1da177e4 LT |
925 | } |
926 | } | |
927 | ||
928 | ret = misc_register(&pcwd_miscdev); | |
929 | if (ret) { | |
27c766aa JP |
930 | pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
931 | WATCHDOG_MINOR, ret); | |
5aa15050 | 932 | goto error_misc_register_watchdog; |
1da177e4 LT |
933 | } |
934 | ||
27c766aa | 935 | pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n", |
1da177e4 LT |
936 | heartbeat, nowayout); |
937 | ||
938 | return 0; | |
5aa15050 WVS |
939 | |
940 | error_misc_register_watchdog: | |
941 | if (pcwd_private.supports_temp) | |
942 | misc_deregister(&temp_miscdev); | |
943 | error_misc_register_temp: | |
261dcc70 AC |
944 | release_region(pcwd_private.io_addr, |
945 | (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); | |
5aa15050 WVS |
946 | error_request_region: |
947 | pcwd_private.io_addr = 0x0000; | |
948 | cards_found--; | |
949 | return ret; | |
1da177e4 LT |
950 | } |
951 | ||
5aa15050 | 952 | static int __devexit pcwd_isa_remove(struct device *dev, unsigned int id) |
1da177e4 | 953 | { |
5aa15050 | 954 | if (debug >= DEBUG) |
27c766aa | 955 | pr_debug("pcwd_isa_remove id=%d\n", id); |
5aa15050 WVS |
956 | |
957 | if (!pcwd_private.io_addr) | |
958 | return 1; | |
959 | ||
1da177e4 LT |
960 | /* Disable the board */ |
961 | if (!nowayout) | |
962 | pcwd_stop(); | |
963 | ||
964 | /* Deregister */ | |
965 | misc_deregister(&pcwd_miscdev); | |
a2be8786 | 966 | if (pcwd_private.supports_temp) |
1da177e4 | 967 | misc_deregister(&temp_miscdev); |
261dcc70 AC |
968 | release_region(pcwd_private.io_addr, |
969 | (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); | |
a2be8786 | 970 | pcwd_private.io_addr = 0x0000; |
f1c3a056 | 971 | cards_found--; |
5aa15050 WVS |
972 | |
973 | return 0; | |
1da177e4 LT |
974 | } |
975 | ||
5aa15050 | 976 | static void pcwd_isa_shutdown(struct device *dev, unsigned int id) |
1da177e4 | 977 | { |
5aa15050 | 978 | if (debug >= DEBUG) |
27c766aa | 979 | pr_debug("pcwd_isa_shutdown id=%d\n", id); |
1da177e4 | 980 | |
5aa15050 | 981 | pcwd_stop(); |
1da177e4 LT |
982 | } |
983 | ||
5aa15050 WVS |
984 | static struct isa_driver pcwd_isa_driver = { |
985 | .match = pcwd_isa_match, | |
986 | .probe = pcwd_isa_probe, | |
82268714 | 987 | .remove = pcwd_isa_remove, |
5aa15050 WVS |
988 | .shutdown = pcwd_isa_shutdown, |
989 | .driver = { | |
990 | .owner = THIS_MODULE, | |
991 | .name = WATCHDOG_NAME, | |
992 | }, | |
993 | }; | |
1da177e4 LT |
994 | |
995 | static int __init pcwd_init_module(void) | |
996 | { | |
5aa15050 | 997 | return isa_register_driver(&pcwd_isa_driver, PCWD_ISA_NR_CARDS); |
1da177e4 LT |
998 | } |
999 | ||
1000 | static void __exit pcwd_cleanup_module(void) | |
1001 | { | |
5aa15050 | 1002 | isa_unregister_driver(&pcwd_isa_driver); |
27c766aa | 1003 | pr_info("Watchdog Module Unloaded\n"); |
1da177e4 LT |
1004 | } |
1005 | ||
1006 | module_init(pcwd_init_module); | |
1007 | module_exit(pcwd_cleanup_module); | |
1008 | ||
143a2e54 WVS |
1009 | MODULE_AUTHOR("Ken Hollis <kenji@bitgate.com>, " |
1010 | "Wim Van Sebroeck <wim@iguana.be>"); | |
1da177e4 | 1011 | MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver"); |
5aa15050 | 1012 | MODULE_VERSION(WATCHDOG_VERSION); |
1da177e4 LT |
1013 | MODULE_LICENSE("GPL"); |
1014 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
1015 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); |