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Commit | Line | Data |
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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. | |
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 CONFIG_WATCHDOG_NOWAYOUT <Matt_Domsch@dell.com> | |
44 | * Added timeout module option to override default | |
45 | */ | |
46 | ||
47 | /* | |
48 | * A bells and whistles driver is available from http://www.pcwd.de/ | |
49 | * More info available at http://www.berkprod.com/ or http://www.pcwatchdog.com/ | |
50 | */ | |
51 | ||
fd41fa61 WVS |
52 | #include <linux/module.h> /* For module specific items */ |
53 | #include <linux/moduleparam.h> /* For new moduleparam's */ | |
54 | #include <linux/types.h> /* For standard types (like size_t) */ | |
55 | #include <linux/errno.h> /* For the -ENODEV/... values */ | |
56 | #include <linux/kernel.h> /* For printk/panic/... */ | |
57 | #include <linux/delay.h> /* For mdelay function */ | |
58 | #include <linux/timer.h> /* For timer related operations */ | |
59 | #include <linux/jiffies.h> /* For jiffies stuff */ | |
60 | #include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */ | |
61 | #include <linux/watchdog.h> /* For the watchdog specific items */ | |
62 | #include <linux/notifier.h> /* For notifier support */ | |
63 | #include <linux/reboot.h> /* For reboot_notifier stuff */ | |
64 | #include <linux/init.h> /* For __init/__exit/... */ | |
65 | #include <linux/fs.h> /* For file operations */ | |
66 | #include <linux/ioport.h> /* For io-port access */ | |
67 | #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */ | |
1da177e4 | 68 | |
fd41fa61 WVS |
69 | #include <asm/uaccess.h> /* For copy_to_user/put_user/... */ |
70 | #include <asm/io.h> /* For inb/outb/... */ | |
71 | ||
72 | /* Module and version information */ | |
f3dc0733 | 73 | #define WATCHDOG_VERSION "1.18" |
bffda5c8 | 74 | #define WATCHDOG_DATE "21 Jan 2007" |
a7122f91 WVS |
75 | #define WATCHDOG_DRIVER_NAME "ISA-PC Watchdog" |
76 | #define WATCHDOG_NAME "pcwd" | |
77 | #define PFX WATCHDOG_NAME ": " | |
78 | #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION " (" WATCHDOG_DATE ")\n" | |
79 | #define WD_VER WATCHDOG_VERSION " (" WATCHDOG_DATE ")" | |
1da177e4 LT |
80 | |
81 | /* | |
82 | * It should be noted that PCWD_REVISION_B was removed because A and B | |
83 | * are essentially the same types of card, with the exception that B | |
84 | * has temperature reporting. Since I didn't receive a Rev.B card, | |
85 | * the Rev.B card is not supported. (It's a good thing too, as they | |
86 | * are no longer in production.) | |
87 | */ | |
88 | #define PCWD_REVISION_A 1 | |
89 | #define PCWD_REVISION_C 2 | |
90 | ||
91 | /* | |
8f0235dc WVS |
92 | * These are the defines that describe the control status bits for the |
93 | * PCI-PC Watchdog card. | |
94 | */ | |
95 | /* Port 1 : Control Status #1 for the PC Watchdog card, revision A. */ | |
4206f0c4 WVS |
96 | #define WD_WDRST 0x01 /* Previously reset state */ |
97 | #define WD_T110 0x02 /* Temperature overheat sense */ | |
98 | #define WD_HRTBT 0x04 /* Heartbeat sense */ | |
99 | #define WD_RLY2 0x08 /* External relay triggered */ | |
100 | #define WD_SRLY2 0x80 /* Software external relay triggered */ | |
8f0235dc | 101 | /* Port 1 : Control Status #1 for the PC Watchdog card, revision C. */ |
4206f0c4 WVS |
102 | #define WD_REVC_WTRP 0x01 /* Watchdog Trip status */ |
103 | #define WD_REVC_HRBT 0x02 /* Watchdog Heartbeat */ | |
104 | #define WD_REVC_TTRP 0x04 /* Temperature Trip status */ | |
105 | #define WD_REVC_RL2A 0x08 /* Relay 2 activated by on-board processor */ | |
106 | #define WD_REVC_RL1A 0x10 /* Relay 1 active */ | |
107 | #define WD_REVC_R2DS 0x40 /* Relay 2 disable */ | |
108 | #define WD_REVC_RLY2 0x80 /* Relay 2 activated? */ | |
8f0235dc WVS |
109 | /* Port 2 : Control Status #2 */ |
110 | #define WD_WDIS 0x10 /* Watchdog Disabled */ | |
111 | #define WD_ENTP 0x20 /* Watchdog Enable Temperature Trip */ | |
112 | #define WD_SSEL 0x40 /* Watchdog Switch Select (1:SW1 <-> 0:SW2) */ | |
113 | #define WD_WCMD 0x80 /* Watchdog Command Mode */ | |
1da177e4 LT |
114 | |
115 | /* max. time we give an ISA watchdog card to process a command */ | |
116 | /* 500ms for each 4 bit response (according to spec.) */ | |
117 | #define ISA_COMMAND_TIMEOUT 1000 | |
118 | ||
119 | /* Watchdog's internal commands */ | |
fd41fa61 WVS |
120 | #define CMD_ISA_IDLE 0x00 |
121 | #define CMD_ISA_VERSION_INTEGER 0x01 | |
122 | #define CMD_ISA_VERSION_TENTH 0x02 | |
123 | #define CMD_ISA_VERSION_HUNDRETH 0x03 | |
124 | #define CMD_ISA_VERSION_MINOR 0x04 | |
125 | #define CMD_ISA_SWITCH_SETTINGS 0x05 | |
369fa252 WVS |
126 | #define CMD_ISA_RESET_PC 0x06 |
127 | #define CMD_ISA_ARM_0 0x07 | |
128 | #define CMD_ISA_ARM_30 0x08 | |
129 | #define CMD_ISA_ARM_60 0x09 | |
fd41fa61 WVS |
130 | #define CMD_ISA_DELAY_TIME_2SECS 0x0A |
131 | #define CMD_ISA_DELAY_TIME_4SECS 0x0B | |
132 | #define CMD_ISA_DELAY_TIME_8SECS 0x0C | |
369fa252 | 133 | #define CMD_ISA_RESET_RELAYS 0x0D |
1da177e4 | 134 | |
f3dc0733 WVS |
135 | /* Watchdog's Dip Switch heartbeat values */ |
136 | static const int heartbeat_tbl [] = { | |
137 | 20, /* OFF-OFF-OFF = 20 Sec */ | |
138 | 40, /* OFF-OFF-ON = 40 Sec */ | |
139 | 60, /* OFF-ON-OFF = 1 Min */ | |
140 | 300, /* OFF-ON-ON = 5 Min */ | |
141 | 600, /* ON-OFF-OFF = 10 Min */ | |
142 | 1800, /* ON-OFF-ON = 30 Min */ | |
143 | 3600, /* ON-ON-OFF = 1 Hour */ | |
144 | 7200, /* ON-ON-ON = 2 hour */ | |
145 | }; | |
146 | ||
1da177e4 LT |
147 | /* |
148 | * We are using an kernel timer to do the pinging of the watchdog | |
149 | * every ~500ms. We try to set the internal heartbeat of the | |
150 | * watchdog to 2 ms. | |
151 | */ | |
152 | ||
153 | #define WDT_INTERVAL (HZ/2+1) | |
154 | ||
155 | /* We can only use 1 card due to the /dev/watchdog restriction */ | |
156 | static int cards_found; | |
157 | ||
158 | /* internal variables */ | |
159 | static atomic_t open_allowed = ATOMIC_INIT(1); | |
160 | static char expect_close; | |
1da177e4 | 161 | static int temp_panic; |
a2be8786 | 162 | static struct { /* this is private data for each ISA-PC watchdog card */ |
2891b6ad | 163 | char fw_ver_str[6]; /* The cards firmware version */ |
a2be8786 WVS |
164 | int revision; /* The card's revision */ |
165 | int supports_temp; /* Wether or not the card has a temperature device */ | |
166 | int command_mode; /* Wether or not the card is in command mode */ | |
167 | int boot_status; /* The card's boot status */ | |
168 | int io_addr; /* The cards I/O address */ | |
169 | spinlock_t io_lock; /* the lock for io operations */ | |
170 | struct timer_list timer; /* The timer that pings the watchdog */ | |
171 | unsigned long next_heartbeat; /* the next_heartbeat for the timer */ | |
172 | } pcwd_private; | |
1da177e4 LT |
173 | |
174 | /* module parameters */ | |
c324ab42 WVS |
175 | #define QUIET 0 /* Default */ |
176 | #define VERBOSE 1 /* Verbose */ | |
177 | #define DEBUG 2 /* print fancy stuff too */ | |
178 | static int debug = QUIET; | |
179 | module_param(debug, int, 0); | |
180 | MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)"); | |
181 | ||
f3dc0733 | 182 | #define WATCHDOG_HEARTBEAT 0 /* default heartbeat = delay-time from dip-switches */ |
1da177e4 LT |
183 | static int heartbeat = WATCHDOG_HEARTBEAT; |
184 | module_param(heartbeat, int, 0); | |
f3dc0733 | 185 | MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (2<=heartbeat<=7200 or 0=delay-time from dip-switches, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); |
1da177e4 | 186 | |
4bfdf378 | 187 | static int nowayout = WATCHDOG_NOWAYOUT; |
1da177e4 | 188 | module_param(nowayout, int, 0); |
bffda5c8 | 189 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
1da177e4 LT |
190 | |
191 | /* | |
192 | * Internal functions | |
193 | */ | |
194 | ||
195 | static int send_isa_command(int cmd) | |
196 | { | |
197 | int i; | |
198 | int control_status; | |
199 | int port0, last_port0; /* Double read for stabilising */ | |
200 | ||
c324ab42 WVS |
201 | if (debug >= DEBUG) |
202 | printk(KERN_DEBUG PFX "sending following data cmd=0x%02x\n", | |
203 | cmd); | |
204 | ||
1da177e4 | 205 | /* The WCMD bit must be 1 and the command is only 4 bits in size */ |
8f0235dc | 206 | control_status = (cmd & 0x0F) | WD_WCMD; |
a2be8786 | 207 | outb_p(control_status, pcwd_private.io_addr + 2); |
1da177e4 LT |
208 | udelay(ISA_COMMAND_TIMEOUT); |
209 | ||
a2be8786 | 210 | port0 = inb_p(pcwd_private.io_addr); |
1da177e4 LT |
211 | for (i = 0; i < 25; ++i) { |
212 | last_port0 = port0; | |
a2be8786 | 213 | port0 = inb_p(pcwd_private.io_addr); |
1da177e4 LT |
214 | |
215 | if (port0 == last_port0) | |
216 | break; /* Data is stable */ | |
217 | ||
218 | udelay (250); | |
219 | } | |
220 | ||
c324ab42 WVS |
221 | if (debug >= DEBUG) |
222 | printk(KERN_DEBUG PFX "received following data for cmd=0x%02x: port0=0x%02x last_port0=0x%02x\n", | |
223 | cmd, port0, last_port0); | |
224 | ||
1da177e4 LT |
225 | return port0; |
226 | } | |
227 | ||
228 | static int set_command_mode(void) | |
229 | { | |
230 | int i, found=0, count=0; | |
231 | ||
232 | /* Set the card into command mode */ | |
a2be8786 | 233 | spin_lock(&pcwd_private.io_lock); |
1da177e4 LT |
234 | while ((!found) && (count < 3)) { |
235 | i = send_isa_command(CMD_ISA_IDLE); | |
236 | ||
237 | if (i == 0x00) | |
238 | found = 1; | |
239 | else if (i == 0xF3) { | |
240 | /* Card does not like what we've done to it */ | |
a2be8786 | 241 | outb_p(0x00, pcwd_private.io_addr + 2); |
1da177e4 | 242 | udelay(1200); /* Spec says wait 1ms */ |
a2be8786 | 243 | outb_p(0x00, pcwd_private.io_addr + 2); |
1da177e4 LT |
244 | udelay(ISA_COMMAND_TIMEOUT); |
245 | } | |
246 | count++; | |
247 | } | |
a2be8786 WVS |
248 | spin_unlock(&pcwd_private.io_lock); |
249 | pcwd_private.command_mode = found; | |
1da177e4 | 250 | |
c324ab42 WVS |
251 | if (debug >= DEBUG) |
252 | printk(KERN_DEBUG PFX "command_mode=%d\n", | |
253 | pcwd_private.command_mode); | |
254 | ||
1da177e4 LT |
255 | return(found); |
256 | } | |
257 | ||
258 | static void unset_command_mode(void) | |
259 | { | |
260 | /* Set the card into normal mode */ | |
a2be8786 WVS |
261 | spin_lock(&pcwd_private.io_lock); |
262 | outb_p(0x00, pcwd_private.io_addr + 2); | |
1da177e4 | 263 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 | 264 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 | 265 | |
a2be8786 | 266 | pcwd_private.command_mode = 0; |
c324ab42 WVS |
267 | |
268 | if (debug >= DEBUG) | |
269 | printk(KERN_DEBUG PFX "command_mode=%d\n", | |
270 | pcwd_private.command_mode); | |
1da177e4 LT |
271 | } |
272 | ||
85875211 WVS |
273 | static inline void pcwd_check_temperature_support(void) |
274 | { | |
275 | if (inb(pcwd_private.io_addr) != 0xF0) | |
276 | pcwd_private.supports_temp = 1; | |
277 | } | |
278 | ||
2891b6ad | 279 | static inline void pcwd_get_firmware(void) |
af3b38d9 WVS |
280 | { |
281 | int one, ten, hund, minor; | |
af3b38d9 | 282 | |
6bbc20bc | 283 | strcpy(pcwd_private.fw_ver_str, "ERROR"); |
af3b38d9 WVS |
284 | |
285 | if (set_command_mode()) { | |
286 | one = send_isa_command(CMD_ISA_VERSION_INTEGER); | |
287 | ten = send_isa_command(CMD_ISA_VERSION_TENTH); | |
288 | hund = send_isa_command(CMD_ISA_VERSION_HUNDRETH); | |
289 | minor = send_isa_command(CMD_ISA_VERSION_MINOR); | |
2891b6ad | 290 | sprintf(pcwd_private.fw_ver_str, "%c.%c%c%c", one, ten, hund, minor); |
af3b38d9 | 291 | } |
af3b38d9 | 292 | unset_command_mode(); |
2891b6ad WVS |
293 | |
294 | return; | |
af3b38d9 WVS |
295 | } |
296 | ||
297 | static inline int pcwd_get_option_switches(void) | |
298 | { | |
299 | int option_switches=0; | |
300 | ||
301 | if (set_command_mode()) { | |
302 | /* Get switch settings */ | |
303 | option_switches = send_isa_command(CMD_ISA_SWITCH_SETTINGS); | |
304 | } | |
305 | ||
306 | unset_command_mode(); | |
307 | return(option_switches); | |
308 | } | |
309 | ||
310 | static void pcwd_show_card_info(void) | |
311 | { | |
af3b38d9 WVS |
312 | int option_switches; |
313 | ||
314 | /* Get some extra info from the hardware (in command/debug/diag mode) */ | |
315 | if (pcwd_private.revision == PCWD_REVISION_A) | |
316 | printk(KERN_INFO PFX "ISA-PC Watchdog (REV.A) detected at port 0x%04x\n", pcwd_private.io_addr); | |
317 | else if (pcwd_private.revision == PCWD_REVISION_C) { | |
2891b6ad | 318 | pcwd_get_firmware(); |
af3b38d9 | 319 | printk(KERN_INFO PFX "ISA-PC Watchdog (REV.C) detected at port 0x%04x (Firmware version: %s)\n", |
2891b6ad | 320 | pcwd_private.io_addr, pcwd_private.fw_ver_str); |
af3b38d9 WVS |
321 | option_switches = pcwd_get_option_switches(); |
322 | printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n", | |
323 | option_switches, | |
324 | ((option_switches & 0x10) ? "ON" : "OFF"), | |
325 | ((option_switches & 0x08) ? "ON" : "OFF")); | |
326 | ||
327 | /* Reprogram internal heartbeat to 2 seconds */ | |
328 | if (set_command_mode()) { | |
329 | send_isa_command(CMD_ISA_DELAY_TIME_2SECS); | |
330 | unset_command_mode(); | |
331 | } | |
332 | } | |
333 | ||
334 | if (pcwd_private.supports_temp) | |
335 | printk(KERN_INFO PFX "Temperature Option Detected\n"); | |
336 | ||
337 | if (pcwd_private.boot_status & WDIOF_CARDRESET) | |
338 | printk(KERN_INFO PFX "Previous reboot was caused by the card\n"); | |
339 | ||
340 | if (pcwd_private.boot_status & WDIOF_OVERHEAT) { | |
341 | printk(KERN_EMERG PFX "Card senses a CPU Overheat. Panicking!\n"); | |
342 | printk(KERN_EMERG PFX "CPU Overheat\n"); | |
343 | } | |
344 | ||
345 | if (pcwd_private.boot_status == 0) | |
346 | printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n"); | |
347 | } | |
348 | ||
1da177e4 LT |
349 | static void pcwd_timer_ping(unsigned long data) |
350 | { | |
351 | int wdrst_stat; | |
352 | ||
353 | /* If we got a heartbeat pulse within the WDT_INTERVAL | |
354 | * we agree to ping the WDT */ | |
a2be8786 | 355 | if(time_before(jiffies, pcwd_private.next_heartbeat)) { |
1da177e4 | 356 | /* Ping the watchdog */ |
a2be8786 WVS |
357 | spin_lock(&pcwd_private.io_lock); |
358 | if (pcwd_private.revision == PCWD_REVISION_A) { | |
1da177e4 | 359 | /* Rev A cards are reset by setting the WD_WDRST bit in register 1 */ |
a2be8786 | 360 | wdrst_stat = inb_p(pcwd_private.io_addr); |
1da177e4 LT |
361 | wdrst_stat &= 0x0F; |
362 | wdrst_stat |= WD_WDRST; | |
363 | ||
a2be8786 | 364 | outb_p(wdrst_stat, pcwd_private.io_addr + 1); |
1da177e4 LT |
365 | } else { |
366 | /* Re-trigger watchdog by writing to port 0 */ | |
a2be8786 | 367 | outb_p(0x00, pcwd_private.io_addr); |
1da177e4 LT |
368 | } |
369 | ||
370 | /* Re-set the timer interval */ | |
a2be8786 | 371 | mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); |
1da177e4 | 372 | |
a2be8786 | 373 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 LT |
374 | } else { |
375 | printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n"); | |
376 | } | |
377 | } | |
378 | ||
379 | static int pcwd_start(void) | |
380 | { | |
381 | int stat_reg; | |
382 | ||
a2be8786 | 383 | pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); |
1da177e4 LT |
384 | |
385 | /* Start the timer */ | |
a2be8786 | 386 | mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); |
1da177e4 LT |
387 | |
388 | /* Enable the port */ | |
a2be8786 WVS |
389 | if (pcwd_private.revision == PCWD_REVISION_C) { |
390 | spin_lock(&pcwd_private.io_lock); | |
391 | outb_p(0x00, pcwd_private.io_addr + 3); | |
1da177e4 | 392 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 WVS |
393 | stat_reg = inb_p(pcwd_private.io_addr + 2); |
394 | spin_unlock(&pcwd_private.io_lock); | |
8f0235dc | 395 | if (stat_reg & WD_WDIS) { |
1da177e4 LT |
396 | printk(KERN_INFO PFX "Could not start watchdog\n"); |
397 | return -EIO; | |
398 | } | |
399 | } | |
c324ab42 WVS |
400 | |
401 | if (debug >= VERBOSE) | |
402 | printk(KERN_DEBUG PFX "Watchdog started\n"); | |
403 | ||
1da177e4 LT |
404 | return 0; |
405 | } | |
406 | ||
407 | static int pcwd_stop(void) | |
408 | { | |
409 | int stat_reg; | |
410 | ||
411 | /* Stop the timer */ | |
a2be8786 | 412 | del_timer(&pcwd_private.timer); |
1da177e4 LT |
413 | |
414 | /* Disable the board */ | |
a2be8786 WVS |
415 | if (pcwd_private.revision == PCWD_REVISION_C) { |
416 | spin_lock(&pcwd_private.io_lock); | |
417 | outb_p(0xA5, pcwd_private.io_addr + 3); | |
1da177e4 | 418 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 | 419 | outb_p(0xA5, pcwd_private.io_addr + 3); |
1da177e4 | 420 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 WVS |
421 | stat_reg = inb_p(pcwd_private.io_addr + 2); |
422 | spin_unlock(&pcwd_private.io_lock); | |
8f0235dc | 423 | if ((stat_reg & WD_WDIS) == 0) { |
1da177e4 LT |
424 | printk(KERN_INFO PFX "Could not stop watchdog\n"); |
425 | return -EIO; | |
426 | } | |
427 | } | |
c324ab42 WVS |
428 | |
429 | if (debug >= VERBOSE) | |
430 | printk(KERN_DEBUG PFX "Watchdog stopped\n"); | |
431 | ||
1da177e4 LT |
432 | return 0; |
433 | } | |
434 | ||
435 | static int pcwd_keepalive(void) | |
436 | { | |
437 | /* user land ping */ | |
a2be8786 | 438 | pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); |
c324ab42 WVS |
439 | |
440 | if (debug >= DEBUG) | |
441 | printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n"); | |
442 | ||
1da177e4 LT |
443 | return 0; |
444 | } | |
445 | ||
446 | static int pcwd_set_heartbeat(int t) | |
447 | { | |
448 | if ((t < 2) || (t > 7200)) /* arbitrary upper limit */ | |
449 | return -EINVAL; | |
450 | ||
451 | heartbeat = t; | |
c324ab42 WVS |
452 | |
453 | if (debug >= VERBOSE) | |
454 | printk(KERN_DEBUG PFX "New heartbeat: %d\n", | |
455 | heartbeat); | |
456 | ||
1da177e4 LT |
457 | return 0; |
458 | } | |
459 | ||
460 | static int pcwd_get_status(int *status) | |
461 | { | |
4206f0c4 | 462 | int control_status; |
1da177e4 LT |
463 | |
464 | *status=0; | |
a2be8786 WVS |
465 | spin_lock(&pcwd_private.io_lock); |
466 | if (pcwd_private.revision == PCWD_REVISION_A) | |
1da177e4 LT |
467 | /* Rev A cards return status information from |
468 | * the base register, which is used for the | |
469 | * temperature in other cards. */ | |
4206f0c4 | 470 | control_status = inb(pcwd_private.io_addr); |
1da177e4 LT |
471 | else { |
472 | /* Rev C cards return card status in the base | |
473 | * address + 1 register. And use different bits | |
474 | * to indicate a card initiated reset, and an | |
475 | * over-temperature condition. And the reboot | |
476 | * status can be reset. */ | |
4206f0c4 | 477 | control_status = inb(pcwd_private.io_addr + 1); |
1da177e4 | 478 | } |
a2be8786 | 479 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 | 480 | |
a2be8786 | 481 | if (pcwd_private.revision == PCWD_REVISION_A) { |
4206f0c4 | 482 | if (control_status & WD_WDRST) |
1da177e4 LT |
483 | *status |= WDIOF_CARDRESET; |
484 | ||
4206f0c4 | 485 | if (control_status & WD_T110) { |
1da177e4 LT |
486 | *status |= WDIOF_OVERHEAT; |
487 | if (temp_panic) { | |
488 | printk (KERN_INFO PFX "Temperature overheat trip!\n"); | |
68acc05d | 489 | kernel_power_off(); |
369fa252 | 490 | /* or should we just do a: panic(PFX "Temperature overheat trip!\n"); */ |
1da177e4 LT |
491 | } |
492 | } | |
493 | } else { | |
4206f0c4 | 494 | if (control_status & WD_REVC_WTRP) |
1da177e4 LT |
495 | *status |= WDIOF_CARDRESET; |
496 | ||
4206f0c4 | 497 | if (control_status & WD_REVC_TTRP) { |
1da177e4 LT |
498 | *status |= WDIOF_OVERHEAT; |
499 | if (temp_panic) { | |
500 | printk (KERN_INFO PFX "Temperature overheat trip!\n"); | |
68acc05d | 501 | kernel_power_off(); |
369fa252 | 502 | /* or should we just do a: panic(PFX "Temperature overheat trip!\n"); */ |
1da177e4 LT |
503 | } |
504 | } | |
505 | } | |
506 | ||
507 | return 0; | |
508 | } | |
509 | ||
510 | static int pcwd_clear_status(void) | |
511 | { | |
4206f0c4 WVS |
512 | int control_status; |
513 | ||
a2be8786 WVS |
514 | if (pcwd_private.revision == PCWD_REVISION_C) { |
515 | spin_lock(&pcwd_private.io_lock); | |
4206f0c4 | 516 | |
c324ab42 WVS |
517 | if (debug >= VERBOSE) |
518 | printk(KERN_INFO PFX "clearing watchdog trip status\n"); | |
519 | ||
4206f0c4 WVS |
520 | control_status = inb_p(pcwd_private.io_addr + 1); |
521 | ||
c324ab42 WVS |
522 | if (debug >= DEBUG) { |
523 | printk(KERN_DEBUG PFX "status was: 0x%02x\n", control_status); | |
524 | printk(KERN_DEBUG PFX "sending: 0x%02x\n", | |
525 | (control_status & WD_REVC_R2DS)); | |
526 | } | |
527 | ||
4206f0c4 WVS |
528 | /* clear reset status & Keep Relay 2 disable state as it is */ |
529 | outb_p((control_status & WD_REVC_R2DS), pcwd_private.io_addr + 1); | |
530 | ||
a2be8786 | 531 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 LT |
532 | } |
533 | return 0; | |
534 | } | |
535 | ||
536 | static int pcwd_get_temperature(int *temperature) | |
537 | { | |
538 | /* check that port 0 gives temperature info and no command results */ | |
a2be8786 | 539 | if (pcwd_private.command_mode) |
1da177e4 LT |
540 | return -1; |
541 | ||
542 | *temperature = 0; | |
a2be8786 | 543 | if (!pcwd_private.supports_temp) |
1da177e4 LT |
544 | return -ENODEV; |
545 | ||
546 | /* | |
547 | * Convert celsius to fahrenheit, since this was | |
548 | * the decided 'standard' for this return value. | |
549 | */ | |
a2be8786 WVS |
550 | spin_lock(&pcwd_private.io_lock); |
551 | *temperature = ((inb(pcwd_private.io_addr)) * 9 / 5) + 32; | |
552 | spin_unlock(&pcwd_private.io_lock); | |
1da177e4 | 553 | |
c324ab42 WVS |
554 | if (debug >= DEBUG) { |
555 | printk(KERN_DEBUG PFX "temperature is: %d F\n", | |
556 | *temperature); | |
557 | } | |
558 | ||
1da177e4 LT |
559 | return 0; |
560 | } | |
561 | ||
562 | /* | |
563 | * /dev/watchdog handling | |
564 | */ | |
565 | ||
566 | static int pcwd_ioctl(struct inode *inode, struct file *file, | |
567 | unsigned int cmd, unsigned long arg) | |
568 | { | |
569 | int rv; | |
570 | int status; | |
571 | int temperature; | |
572 | int new_heartbeat; | |
573 | int __user *argp = (int __user *)arg; | |
574 | static struct watchdog_info ident = { | |
575 | .options = WDIOF_OVERHEAT | | |
576 | WDIOF_CARDRESET | | |
577 | WDIOF_KEEPALIVEPING | | |
578 | WDIOF_SETTIMEOUT | | |
579 | WDIOF_MAGICCLOSE, | |
580 | .firmware_version = 1, | |
581 | .identity = "PCWD", | |
582 | }; | |
583 | ||
584 | switch(cmd) { | |
585 | default: | |
795b89d2 | 586 | return -ENOTTY; |
1da177e4 LT |
587 | |
588 | case WDIOC_GETSUPPORT: | |
589 | if(copy_to_user(argp, &ident, sizeof(ident))) | |
590 | return -EFAULT; | |
591 | return 0; | |
592 | ||
593 | case WDIOC_GETSTATUS: | |
594 | pcwd_get_status(&status); | |
595 | return put_user(status, argp); | |
596 | ||
597 | case WDIOC_GETBOOTSTATUS: | |
a2be8786 | 598 | return put_user(pcwd_private.boot_status, argp); |
1da177e4 LT |
599 | |
600 | case WDIOC_GETTEMP: | |
601 | if (pcwd_get_temperature(&temperature)) | |
602 | return -EFAULT; | |
603 | ||
604 | return put_user(temperature, argp); | |
605 | ||
606 | case WDIOC_SETOPTIONS: | |
a2be8786 | 607 | if (pcwd_private.revision == PCWD_REVISION_C) |
1da177e4 LT |
608 | { |
609 | if(copy_from_user(&rv, argp, sizeof(int))) | |
610 | return -EFAULT; | |
611 | ||
612 | if (rv & WDIOS_DISABLECARD) | |
613 | { | |
614 | return pcwd_stop(); | |
615 | } | |
616 | ||
617 | if (rv & WDIOS_ENABLECARD) | |
618 | { | |
619 | return pcwd_start(); | |
620 | } | |
621 | ||
622 | if (rv & WDIOS_TEMPPANIC) | |
623 | { | |
624 | temp_panic = 1; | |
625 | } | |
626 | } | |
627 | return -EINVAL; | |
628 | ||
629 | case WDIOC_KEEPALIVE: | |
630 | pcwd_keepalive(); | |
631 | return 0; | |
632 | ||
633 | case WDIOC_SETTIMEOUT: | |
634 | if (get_user(new_heartbeat, argp)) | |
635 | return -EFAULT; | |
636 | ||
637 | if (pcwd_set_heartbeat(new_heartbeat)) | |
638 | return -EINVAL; | |
639 | ||
640 | pcwd_keepalive(); | |
641 | /* Fall */ | |
642 | ||
643 | case WDIOC_GETTIMEOUT: | |
644 | return put_user(heartbeat, argp); | |
645 | } | |
646 | ||
647 | return 0; | |
648 | } | |
649 | ||
650 | static ssize_t pcwd_write(struct file *file, const char __user *buf, size_t len, | |
651 | loff_t *ppos) | |
652 | { | |
653 | if (len) { | |
654 | if (!nowayout) { | |
655 | size_t i; | |
656 | ||
657 | /* In case it was set long ago */ | |
658 | expect_close = 0; | |
659 | ||
660 | for (i = 0; i != len; i++) { | |
661 | char c; | |
662 | ||
663 | if (get_user(c, buf + i)) | |
664 | return -EFAULT; | |
665 | if (c == 'V') | |
666 | expect_close = 42; | |
667 | } | |
668 | } | |
669 | pcwd_keepalive(); | |
670 | } | |
671 | return len; | |
672 | } | |
673 | ||
674 | static int pcwd_open(struct inode *inode, struct file *file) | |
675 | { | |
676 | if (!atomic_dec_and_test(&open_allowed) ) { | |
c324ab42 WVS |
677 | if (debug >= VERBOSE) |
678 | printk(KERN_ERR PFX "Attempt to open already opened device.\n"); | |
1da177e4 LT |
679 | atomic_inc( &open_allowed ); |
680 | return -EBUSY; | |
681 | } | |
682 | ||
683 | if (nowayout) | |
684 | __module_get(THIS_MODULE); | |
685 | ||
686 | /* Activate */ | |
687 | pcwd_start(); | |
688 | pcwd_keepalive(); | |
689 | return nonseekable_open(inode, file); | |
690 | } | |
691 | ||
692 | static int pcwd_close(struct inode *inode, struct file *file) | |
693 | { | |
694 | if (expect_close == 42) { | |
695 | pcwd_stop(); | |
696 | } else { | |
697 | printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); | |
698 | pcwd_keepalive(); | |
699 | } | |
700 | expect_close = 0; | |
701 | atomic_inc( &open_allowed ); | |
702 | return 0; | |
703 | } | |
704 | ||
705 | /* | |
706 | * /dev/temperature handling | |
707 | */ | |
708 | ||
709 | static ssize_t pcwd_temp_read(struct file *file, char __user *buf, size_t count, | |
710 | loff_t *ppos) | |
711 | { | |
712 | int temperature; | |
713 | ||
714 | if (pcwd_get_temperature(&temperature)) | |
715 | return -EFAULT; | |
716 | ||
717 | if (copy_to_user(buf, &temperature, 1)) | |
718 | return -EFAULT; | |
719 | ||
720 | return 1; | |
721 | } | |
722 | ||
723 | static int pcwd_temp_open(struct inode *inode, struct file *file) | |
724 | { | |
a2be8786 | 725 | if (!pcwd_private.supports_temp) |
1da177e4 LT |
726 | return -ENODEV; |
727 | ||
728 | return nonseekable_open(inode, file); | |
729 | } | |
730 | ||
731 | static int pcwd_temp_close(struct inode *inode, struct file *file) | |
732 | { | |
733 | return 0; | |
734 | } | |
735 | ||
736 | /* | |
737 | * Notify system | |
738 | */ | |
739 | ||
740 | static int pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused) | |
741 | { | |
742 | if (code==SYS_DOWN || code==SYS_HALT) { | |
743 | /* Turn the WDT off */ | |
744 | pcwd_stop(); | |
745 | } | |
746 | ||
747 | return NOTIFY_DONE; | |
748 | } | |
749 | ||
750 | /* | |
751 | * Kernel Interfaces | |
752 | */ | |
753 | ||
62322d25 | 754 | static const struct file_operations pcwd_fops = { |
1da177e4 LT |
755 | .owner = THIS_MODULE, |
756 | .llseek = no_llseek, | |
757 | .write = pcwd_write, | |
758 | .ioctl = pcwd_ioctl, | |
759 | .open = pcwd_open, | |
760 | .release = pcwd_close, | |
761 | }; | |
762 | ||
763 | static struct miscdevice pcwd_miscdev = { | |
764 | .minor = WATCHDOG_MINOR, | |
765 | .name = "watchdog", | |
766 | .fops = &pcwd_fops, | |
767 | }; | |
768 | ||
62322d25 | 769 | static const struct file_operations pcwd_temp_fops = { |
1da177e4 LT |
770 | .owner = THIS_MODULE, |
771 | .llseek = no_llseek, | |
772 | .read = pcwd_temp_read, | |
773 | .open = pcwd_temp_open, | |
774 | .release = pcwd_temp_close, | |
775 | }; | |
776 | ||
777 | static struct miscdevice temp_miscdev = { | |
778 | .minor = TEMP_MINOR, | |
779 | .name = "temperature", | |
780 | .fops = &pcwd_temp_fops, | |
781 | }; | |
782 | ||
783 | static struct notifier_block pcwd_notifier = { | |
784 | .notifier_call = pcwd_notify_sys, | |
785 | }; | |
786 | ||
787 | /* | |
788 | * Init & exit routines | |
789 | */ | |
790 | ||
1da177e4 LT |
791 | static inline int get_revision(void) |
792 | { | |
793 | int r = PCWD_REVISION_C; | |
794 | ||
a2be8786 | 795 | spin_lock(&pcwd_private.io_lock); |
1da177e4 LT |
796 | /* REV A cards use only 2 io ports; test |
797 | * presumes a floating bus reads as 0xff. */ | |
a2be8786 WVS |
798 | if ((inb(pcwd_private.io_addr + 2) == 0xFF) || |
799 | (inb(pcwd_private.io_addr + 3) == 0xFF)) | |
1da177e4 | 800 | r=PCWD_REVISION_A; |
a2be8786 | 801 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 LT |
802 | |
803 | return r; | |
804 | } | |
805 | ||
1da177e4 LT |
806 | static int __devinit pcwatchdog_init(int base_addr) |
807 | { | |
808 | int ret; | |
1da177e4 LT |
809 | |
810 | cards_found++; | |
811 | if (cards_found == 1) | |
812 | printk(KERN_INFO PFX "v%s Ken Hollis (kenji@bitgate.com)\n", WD_VER); | |
813 | ||
814 | if (cards_found > 1) { | |
815 | printk(KERN_ERR PFX "This driver only supports 1 device\n"); | |
816 | return -ENODEV; | |
817 | } | |
818 | ||
819 | if (base_addr == 0x0000) { | |
820 | printk(KERN_ERR PFX "No I/O-Address for card detected\n"); | |
821 | return -ENODEV; | |
822 | } | |
a2be8786 | 823 | pcwd_private.io_addr = base_addr; |
1da177e4 LT |
824 | |
825 | /* Check card's revision */ | |
a2be8786 | 826 | pcwd_private.revision = get_revision(); |
1da177e4 | 827 | |
a2be8786 | 828 | if (!request_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) { |
1da177e4 | 829 | printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", |
a2be8786 WVS |
830 | pcwd_private.io_addr); |
831 | pcwd_private.io_addr = 0x0000; | |
1da177e4 LT |
832 | return -EIO; |
833 | } | |
834 | ||
835 | /* Initial variables */ | |
a2be8786 | 836 | pcwd_private.supports_temp = 0; |
1da177e4 | 837 | temp_panic = 0; |
a2be8786 | 838 | pcwd_private.boot_status = 0x0000; |
1da177e4 LT |
839 | |
840 | /* get the boot_status */ | |
a2be8786 | 841 | pcwd_get_status(&pcwd_private.boot_status); |
1da177e4 LT |
842 | |
843 | /* clear the "card caused reboot" flag */ | |
844 | pcwd_clear_status(); | |
845 | ||
82eb7c50 | 846 | setup_timer(&pcwd_private.timer, pcwd_timer_ping, 0); |
1da177e4 LT |
847 | |
848 | /* Disable the board */ | |
849 | pcwd_stop(); | |
850 | ||
851 | /* Check whether or not the card supports the temperature device */ | |
85875211 | 852 | pcwd_check_temperature_support(); |
1da177e4 | 853 | |
af3b38d9 WVS |
854 | /* Show info about the card itself */ |
855 | pcwd_show_card_info(); | |
1da177e4 | 856 | |
f3dc0733 WVS |
857 | /* If heartbeat = 0 then we use the heartbeat from the dip-switches */ |
858 | if (heartbeat == 0) | |
859 | heartbeat = heartbeat_tbl[(pcwd_get_option_switches() & 0x07)]; | |
860 | ||
1da177e4 | 861 | /* Check that the heartbeat value is within it's range ; if not reset to the default */ |
fd41fa61 WVS |
862 | if (pcwd_set_heartbeat(heartbeat)) { |
863 | pcwd_set_heartbeat(WATCHDOG_HEARTBEAT); | |
864 | printk(KERN_INFO PFX "heartbeat value must be 2<=heartbeat<=7200, using %d\n", | |
865 | WATCHDOG_HEARTBEAT); | |
1da177e4 LT |
866 | } |
867 | ||
868 | ret = register_reboot_notifier(&pcwd_notifier); | |
869 | if (ret) { | |
870 | printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", | |
871 | ret); | |
a2be8786 WVS |
872 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
873 | pcwd_private.io_addr = 0x0000; | |
1da177e4 LT |
874 | return ret; |
875 | } | |
876 | ||
a2be8786 | 877 | if (pcwd_private.supports_temp) { |
1da177e4 LT |
878 | ret = misc_register(&temp_miscdev); |
879 | if (ret) { | |
880 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
881 | TEMP_MINOR, ret); | |
882 | unregister_reboot_notifier(&pcwd_notifier); | |
a2be8786 WVS |
883 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
884 | pcwd_private.io_addr = 0x0000; | |
1da177e4 LT |
885 | return ret; |
886 | } | |
887 | } | |
888 | ||
889 | ret = misc_register(&pcwd_miscdev); | |
890 | if (ret) { | |
891 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
892 | WATCHDOG_MINOR, ret); | |
a2be8786 | 893 | if (pcwd_private.supports_temp) |
1da177e4 LT |
894 | misc_deregister(&temp_miscdev); |
895 | unregister_reboot_notifier(&pcwd_notifier); | |
a2be8786 WVS |
896 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
897 | pcwd_private.io_addr = 0x0000; | |
1da177e4 LT |
898 | return ret; |
899 | } | |
900 | ||
901 | printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", | |
902 | heartbeat, nowayout); | |
903 | ||
904 | return 0; | |
905 | } | |
906 | ||
907 | static void __devexit pcwatchdog_exit(void) | |
908 | { | |
909 | /* Disable the board */ | |
910 | if (!nowayout) | |
911 | pcwd_stop(); | |
912 | ||
913 | /* Deregister */ | |
914 | misc_deregister(&pcwd_miscdev); | |
a2be8786 | 915 | if (pcwd_private.supports_temp) |
1da177e4 LT |
916 | misc_deregister(&temp_miscdev); |
917 | unregister_reboot_notifier(&pcwd_notifier); | |
a2be8786 WVS |
918 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
919 | pcwd_private.io_addr = 0x0000; | |
f1c3a056 | 920 | cards_found--; |
1da177e4 LT |
921 | } |
922 | ||
923 | /* | |
924 | * The ISA cards have a heartbeat bit in one of the registers, which | |
925 | * register is card dependent. The heartbeat bit is monitored, and if | |
926 | * found, is considered proof that a Berkshire card has been found. | |
927 | * The initial rate is once per second at board start up, then twice | |
928 | * per second for normal operation. | |
929 | */ | |
930 | static int __init pcwd_checkcard(int base_addr) | |
931 | { | |
932 | int port0, last_port0; /* Reg 0, in case it's REV A */ | |
933 | int port1, last_port1; /* Register 1 for REV C cards */ | |
934 | int i; | |
935 | int retval; | |
936 | ||
937 | if (!request_region (base_addr, 4, "PCWD")) { | |
938 | printk (KERN_INFO PFX "Port 0x%04x unavailable\n", base_addr); | |
939 | return 0; | |
940 | } | |
941 | ||
942 | retval = 0; | |
943 | ||
944 | port0 = inb_p(base_addr); /* For REV A boards */ | |
945 | port1 = inb_p(base_addr + 1); /* For REV C boards */ | |
946 | if (port0 != 0xff || port1 != 0xff) { | |
947 | /* Not an 'ff' from a floating bus, so must be a card! */ | |
948 | for (i = 0; i < 4; ++i) { | |
949 | ||
950 | msleep(500); | |
951 | ||
952 | last_port0 = port0; | |
953 | last_port1 = port1; | |
954 | ||
955 | port0 = inb_p(base_addr); | |
956 | port1 = inb_p(base_addr + 1); | |
957 | ||
958 | /* Has either hearbeat bit changed? */ | |
959 | if ((port0 ^ last_port0) & WD_HRTBT || | |
960 | (port1 ^ last_port1) & WD_REVC_HRBT) { | |
961 | retval = 1; | |
962 | break; | |
963 | } | |
964 | } | |
965 | } | |
966 | release_region (base_addr, 4); | |
967 | ||
968 | return retval; | |
969 | } | |
970 | ||
971 | /* | |
972 | * These are the auto-probe addresses available. | |
973 | * | |
974 | * Revision A only uses ports 0x270 and 0x370. Revision C introduced 0x350. | |
975 | * Revision A has an address range of 2 addresses, while Revision C has 4. | |
976 | */ | |
977 | static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 }; | |
978 | ||
979 | static int __init pcwd_init_module(void) | |
980 | { | |
981 | int i, found = 0; | |
982 | ||
a2be8786 | 983 | spin_lock_init(&pcwd_private.io_lock); |
1da177e4 LT |
984 | |
985 | for (i = 0; pcwd_ioports[i] != 0; i++) { | |
986 | if (pcwd_checkcard(pcwd_ioports[i])) { | |
987 | if (!(pcwatchdog_init(pcwd_ioports[i]))) | |
988 | found++; | |
989 | } | |
990 | } | |
991 | ||
992 | if (!found) { | |
993 | printk (KERN_INFO PFX "No card detected, or port not available\n"); | |
994 | return -ENODEV; | |
995 | } | |
996 | ||
997 | return 0; | |
998 | } | |
999 | ||
1000 | static void __exit pcwd_cleanup_module(void) | |
1001 | { | |
a2be8786 | 1002 | if (pcwd_private.io_addr) |
1da177e4 | 1003 | pcwatchdog_exit(); |
369fa252 WVS |
1004 | |
1005 | printk(KERN_INFO PFX "Watchdog Module Unloaded.\n"); | |
1da177e4 LT |
1006 | } |
1007 | ||
1008 | module_init(pcwd_init_module); | |
1009 | module_exit(pcwd_cleanup_module); | |
1010 | ||
1011 | MODULE_AUTHOR("Ken Hollis <kenji@bitgate.com>"); | |
1012 | MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver"); | |
1013 | MODULE_LICENSE("GPL"); | |
1014 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
1015 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); |