Commit | Line | Data |
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789fc0ad SAMJ |
1 | /* |
2 | * NS pc87413-wdt Watchdog Timer driver for Linux 2.6.x.x | |
3 | * | |
00b3b3e6 | 4 | * This code is based on wdt.c with original copyright. |
789fc0ad | 5 | * |
00b3b3e6 SAMJ |
6 | * (C) Copyright 2006 Sven Anders, <anders@anduras.de> |
7 | * and Marcus Junker, <junker@anduras.de> | |
789fc0ad SAMJ |
8 | * |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | * | |
00b3b3e6 | 14 | * Neither Sven Anders, Marcus Junker nor ANDURAS AG |
789fc0ad SAMJ |
15 | * admit liability nor provide warranty for any of this software. |
16 | * This material is provided "AS-IS" and at no charge. | |
17 | * | |
00b3b3e6 | 18 | * Release 1.1 |
789fc0ad SAMJ |
19 | */ |
20 | ||
789fc0ad SAMJ |
21 | #include <linux/module.h> |
22 | #include <linux/types.h> | |
23 | #include <linux/miscdevice.h> | |
24 | #include <linux/watchdog.h> | |
25 | #include <linux/ioport.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/notifier.h> | |
28 | #include <linux/fs.h> | |
29 | #include <linux/reboot.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/spinlock.h> | |
32 | #include <linux/moduleparam.h> | |
33 | #include <linux/version.h> | |
aee334c2 AC |
34 | #include <linux/io.h> |
35 | #include <linux/uaccess.h> | |
789fc0ad | 36 | |
789fc0ad SAMJ |
37 | #include <asm/system.h> |
38 | ||
00b3b3e6 | 39 | /* #define DEBUG 1 */ |
789fc0ad | 40 | |
00b3b3e6 SAMJ |
41 | #define DEFAULT_TIMEOUT 1 /* 1 minute */ |
42 | #define MAX_TIMEOUT 255 | |
789fc0ad | 43 | |
00b3b3e6 SAMJ |
44 | #define VERSION "1.1" |
45 | #define MODNAME "pc87413 WDT" | |
46 | #define PFX MODNAME ": " | |
47 | #define DPFX MODNAME " - DEBUG: " | |
789fc0ad | 48 | |
00b3b3e6 SAMJ |
49 | #define WDT_INDEX_IO_PORT (io+0) /* I/O port base (index register) */ |
50 | #define WDT_DATA_IO_PORT (WDT_INDEX_IO_PORT+1) | |
51 | #define SWC_LDN 0x04 | |
52 | #define SIOCFG2 0x22 /* Serial IO register */ | |
53 | #define WDCTL 0x10 /* Watchdog-Timer-Controll-Register */ | |
54 | #define WDTO 0x11 /* Watchdog timeout register */ | |
55 | #define WDCFG 0x12 /* Watchdog config register */ | |
789fc0ad | 56 | |
00b3b3e6 | 57 | static int io = 0x2E; /* Address used on Portwell Boards */ |
789fc0ad | 58 | |
aee334c2 AC |
59 | static int timeout = DEFAULT_TIMEOUT; /* timeout value */ |
60 | static unsigned long timer_enabled; /* is the timer enabled? */ | |
789fc0ad | 61 | |
aee334c2 | 62 | static char expect_close; /* is the close expected? */ |
789fc0ad | 63 | |
aee334c2 | 64 | static DEFINE_SPINLOCK(io_lock); /* to guard us from io races */ |
789fc0ad | 65 | |
00b3b3e6 | 66 | static int nowayout = WATCHDOG_NOWAYOUT; |
789fc0ad | 67 | |
00b3b3e6 | 68 | /* -- Low level function ----------------------------------------*/ |
789fc0ad | 69 | |
00b3b3e6 | 70 | /* Select pins for Watchdog output */ |
789fc0ad | 71 | |
aee334c2 | 72 | static inline void pc87413_select_wdt_out(void) |
789fc0ad | 73 | { |
00b3b3e6 | 74 | unsigned int cr_data = 0; |
789fc0ad | 75 | |
00b3b3e6 | 76 | /* Step 1: Select multiple pin,pin55,as WDT output */ |
789fc0ad SAMJ |
77 | |
78 | outb_p(SIOCFG2, WDT_INDEX_IO_PORT); | |
79 | ||
aee334c2 | 80 | cr_data = inb(WDT_DATA_IO_PORT); |
789fc0ad SAMJ |
81 | |
82 | cr_data |= 0x80; /* Set Bit7 to 1*/ | |
83 | outb_p(SIOCFG2, WDT_INDEX_IO_PORT); | |
84 | ||
85 | outb_p(cr_data, WDT_DATA_IO_PORT); | |
86 | ||
00b3b3e6 | 87 | #ifdef DEBUG |
aee334c2 AC |
88 | printk(KERN_INFO DPFX |
89 | "Select multiple pin,pin55,as WDT output: Bit7 to 1: %d\n", | |
90 | cr_data); | |
00b3b3e6 | 91 | #endif |
789fc0ad SAMJ |
92 | } |
93 | ||
00b3b3e6 | 94 | /* Enable SWC functions */ |
789fc0ad | 95 | |
00b3b3e6 SAMJ |
96 | static inline void pc87413_enable_swc(void) |
97 | { | |
aee334c2 | 98 | unsigned int cr_data = 0; |
789fc0ad SAMJ |
99 | |
100 | /* Step 2: Enable SWC functions */ | |
101 | ||
102 | outb_p(0x07, WDT_INDEX_IO_PORT); /* Point SWC_LDN (LDN=4) */ | |
103 | outb_p(SWC_LDN, WDT_DATA_IO_PORT); | |
104 | ||
105 | outb_p(0x30, WDT_INDEX_IO_PORT); /* Read Index 0x30 First */ | |
00b3b3e6 | 106 | cr_data = inb(WDT_DATA_IO_PORT); |
789fc0ad SAMJ |
107 | cr_data |= 0x01; /* Set Bit0 to 1 */ |
108 | outb_p(0x30, WDT_INDEX_IO_PORT); | |
109 | outb_p(cr_data, WDT_DATA_IO_PORT); /* Index0x30_bit0P1 */ | |
110 | ||
00b3b3e6 | 111 | #ifdef DEBUG |
789fc0ad | 112 | printk(KERN_INFO DPFX "pc87413 - Enable SWC functions\n"); |
00b3b3e6 | 113 | #endif |
789fc0ad SAMJ |
114 | } |
115 | ||
00b3b3e6 SAMJ |
116 | /* Read SWC I/O base address */ |
117 | ||
118 | static inline unsigned int pc87413_get_swc_base(void) | |
789fc0ad | 119 | { |
00b3b3e6 SAMJ |
120 | unsigned int swc_base_addr = 0; |
121 | unsigned char addr_l, addr_h = 0; | |
789fc0ad SAMJ |
122 | |
123 | /* Step 3: Read SWC I/O Base Address */ | |
124 | ||
125 | outb_p(0x60, WDT_INDEX_IO_PORT); /* Read Index 0x60 */ | |
00b3b3e6 | 126 | addr_h = inb(WDT_DATA_IO_PORT); |
789fc0ad SAMJ |
127 | |
128 | outb_p(0x61, WDT_INDEX_IO_PORT); /* Read Index 0x61 */ | |
129 | ||
00b3b3e6 | 130 | addr_l = inb(WDT_DATA_IO_PORT); |
789fc0ad SAMJ |
131 | |
132 | swc_base_addr = (addr_h << 8) + addr_l; | |
00b3b3e6 | 133 | #ifdef DEBUG |
aee334c2 AC |
134 | printk(KERN_INFO DPFX |
135 | "Read SWC I/O Base Address: low %d, high %d, res %d\n", | |
136 | addr_l, addr_h, swc_base_addr); | |
00b3b3e6 | 137 | #endif |
789fc0ad SAMJ |
138 | return swc_base_addr; |
139 | } | |
140 | ||
00b3b3e6 SAMJ |
141 | /* Select Bank 3 of SWC */ |
142 | ||
143 | static inline void pc87413_swc_bank3(unsigned int swc_base_addr) | |
789fc0ad SAMJ |
144 | { |
145 | /* Step 4: Select Bank3 of SWC */ | |
00b3b3e6 | 146 | outb_p(inb(swc_base_addr + 0x0f) | 0x03, swc_base_addr + 0x0f); |
00b3b3e6 | 147 | #ifdef DEBUG |
789fc0ad | 148 | printk(KERN_INFO DPFX "Select Bank3 of SWC\n"); |
00b3b3e6 | 149 | #endif |
789fc0ad SAMJ |
150 | } |
151 | ||
00b3b3e6 SAMJ |
152 | /* Set watchdog timeout to x minutes */ |
153 | ||
154 | static inline void pc87413_programm_wdto(unsigned int swc_base_addr, | |
155 | char pc87413_time) | |
789fc0ad SAMJ |
156 | { |
157 | /* Step 5: Programm WDTO, Twd. */ | |
00b3b3e6 | 158 | outb_p(pc87413_time, swc_base_addr + WDTO); |
00b3b3e6 | 159 | #ifdef DEBUG |
789fc0ad | 160 | printk(KERN_INFO DPFX "Set WDTO to %d minutes\n", pc87413_time); |
00b3b3e6 | 161 | #endif |
789fc0ad SAMJ |
162 | } |
163 | ||
00b3b3e6 SAMJ |
164 | /* Enable WDEN */ |
165 | ||
166 | static inline void pc87413_enable_wden(unsigned int swc_base_addr) | |
789fc0ad SAMJ |
167 | { |
168 | /* Step 6: Enable WDEN */ | |
aee334c2 | 169 | outb_p(inb(swc_base_addr + WDCTL) | 0x01, swc_base_addr + WDCTL); |
00b3b3e6 | 170 | #ifdef DEBUG |
789fc0ad | 171 | printk(KERN_INFO DPFX "Enable WDEN\n"); |
00b3b3e6 | 172 | #endif |
789fc0ad SAMJ |
173 | } |
174 | ||
00b3b3e6 SAMJ |
175 | /* Enable SW_WD_TREN */ |
176 | static inline void pc87413_enable_sw_wd_tren(unsigned int swc_base_addr) | |
789fc0ad SAMJ |
177 | { |
178 | /* Enable SW_WD_TREN */ | |
aee334c2 | 179 | outb_p(inb(swc_base_addr + WDCFG) | 0x80, swc_base_addr + WDCFG); |
00b3b3e6 | 180 | #ifdef DEBUG |
789fc0ad | 181 | printk(KERN_INFO DPFX "Enable SW_WD_TREN\n"); |
00b3b3e6 | 182 | #endif |
789fc0ad SAMJ |
183 | } |
184 | ||
00b3b3e6 SAMJ |
185 | /* Disable SW_WD_TREN */ |
186 | ||
187 | static inline void pc87413_disable_sw_wd_tren(unsigned int swc_base_addr) | |
789fc0ad SAMJ |
188 | { |
189 | /* Disable SW_WD_TREN */ | |
aee334c2 | 190 | outb_p(inb(swc_base_addr + WDCFG) & 0x7f, swc_base_addr + WDCFG); |
00b3b3e6 | 191 | #ifdef DEBUG |
789fc0ad | 192 | printk(KERN_INFO DPFX "pc87413 - Disable SW_WD_TREN\n"); |
00b3b3e6 | 193 | #endif |
789fc0ad SAMJ |
194 | } |
195 | ||
00b3b3e6 | 196 | /* Enable SW_WD_TRG */ |
789fc0ad | 197 | |
00b3b3e6 | 198 | static inline void pc87413_enable_sw_wd_trg(unsigned int swc_base_addr) |
789fc0ad | 199 | { |
789fc0ad | 200 | /* Enable SW_WD_TRG */ |
aee334c2 | 201 | outb_p(inb(swc_base_addr + WDCTL) | 0x80, swc_base_addr + WDCTL); |
00b3b3e6 | 202 | #ifdef DEBUG |
789fc0ad | 203 | printk(KERN_INFO DPFX "pc87413 - Enable SW_WD_TRG\n"); |
00b3b3e6 | 204 | #endif |
789fc0ad SAMJ |
205 | } |
206 | ||
00b3b3e6 | 207 | /* Disable SW_WD_TRG */ |
789fc0ad | 208 | |
00b3b3e6 SAMJ |
209 | static inline void pc87413_disable_sw_wd_trg(unsigned int swc_base_addr) |
210 | { | |
789fc0ad | 211 | /* Disable SW_WD_TRG */ |
aee334c2 | 212 | outb_p(inb(swc_base_addr + WDCTL) & 0x7f, swc_base_addr + WDCTL); |
00b3b3e6 | 213 | #ifdef DEBUG |
789fc0ad | 214 | printk(KERN_INFO DPFX "Disable SW_WD_TRG\n"); |
00b3b3e6 | 215 | #endif |
789fc0ad SAMJ |
216 | } |
217 | ||
00b3b3e6 | 218 | /* -- Higher level functions ------------------------------------*/ |
789fc0ad | 219 | |
00b3b3e6 | 220 | /* Enable the watchdog */ |
789fc0ad | 221 | |
00b3b3e6 | 222 | static void pc87413_enable(void) |
789fc0ad | 223 | { |
00b3b3e6 SAMJ |
224 | unsigned int swc_base_addr; |
225 | ||
226 | spin_lock(&io_lock); | |
789fc0ad SAMJ |
227 | |
228 | pc87413_select_wdt_out(); | |
229 | pc87413_enable_swc(); | |
230 | swc_base_addr = pc87413_get_swc_base(); | |
231 | pc87413_swc_bank3(swc_base_addr); | |
00b3b3e6 SAMJ |
232 | pc87413_programm_wdto(swc_base_addr, timeout); |
233 | pc87413_enable_wden(swc_base_addr); | |
234 | pc87413_enable_sw_wd_tren(swc_base_addr); | |
235 | pc87413_enable_sw_wd_trg(swc_base_addr); | |
236 | ||
237 | spin_unlock(&io_lock); | |
789fc0ad SAMJ |
238 | } |
239 | ||
00b3b3e6 | 240 | /* Disable the watchdog */ |
789fc0ad | 241 | |
00b3b3e6 | 242 | static void pc87413_disable(void) |
789fc0ad | 243 | { |
00b3b3e6 SAMJ |
244 | unsigned int swc_base_addr; |
245 | ||
246 | spin_lock(&io_lock); | |
789fc0ad SAMJ |
247 | |
248 | pc87413_select_wdt_out(); | |
249 | pc87413_enable_swc(); | |
250 | swc_base_addr = pc87413_get_swc_base(); | |
251 | pc87413_swc_bank3(swc_base_addr); | |
252 | pc87413_disable_sw_wd_tren(swc_base_addr); | |
253 | pc87413_disable_sw_wd_trg(swc_base_addr); | |
00b3b3e6 SAMJ |
254 | pc87413_programm_wdto(swc_base_addr, 0); |
255 | ||
256 | spin_unlock(&io_lock); | |
789fc0ad SAMJ |
257 | } |
258 | ||
00b3b3e6 | 259 | /* Refresh the watchdog */ |
789fc0ad | 260 | |
00b3b3e6 | 261 | static void pc87413_refresh(void) |
789fc0ad | 262 | { |
00b3b3e6 SAMJ |
263 | unsigned int swc_base_addr; |
264 | ||
265 | spin_lock(&io_lock); | |
789fc0ad SAMJ |
266 | |
267 | pc87413_select_wdt_out(); | |
268 | pc87413_enable_swc(); | |
269 | swc_base_addr = pc87413_get_swc_base(); | |
270 | pc87413_swc_bank3(swc_base_addr); | |
00b3b3e6 SAMJ |
271 | pc87413_disable_sw_wd_tren(swc_base_addr); |
272 | pc87413_disable_sw_wd_trg(swc_base_addr); | |
273 | pc87413_programm_wdto(swc_base_addr, timeout); | |
789fc0ad SAMJ |
274 | pc87413_enable_wden(swc_base_addr); |
275 | pc87413_enable_sw_wd_tren(swc_base_addr); | |
276 | pc87413_enable_sw_wd_trg(swc_base_addr); | |
277 | ||
00b3b3e6 | 278 | spin_unlock(&io_lock); |
789fc0ad SAMJ |
279 | } |
280 | ||
00b3b3e6 SAMJ |
281 | /* -- File operations -------------------------------------------*/ |
282 | ||
283 | /** | |
284 | * pc87413_open: | |
285 | * @inode: inode of device | |
286 | * @file: file handle to device | |
287 | * | |
288 | */ | |
289 | ||
290 | static int pc87413_open(struct inode *inode, struct file *file) | |
291 | { | |
292 | /* /dev/watchdog can only be opened once */ | |
293 | ||
294 | if (test_and_set_bit(0, &timer_enabled)) | |
295 | return -EBUSY; | |
296 | ||
297 | if (nowayout) | |
298 | __module_get(THIS_MODULE); | |
789fc0ad | 299 | |
00b3b3e6 SAMJ |
300 | /* Reload and activate timer */ |
301 | pc87413_refresh(); | |
789fc0ad | 302 | |
aee334c2 AC |
303 | printk(KERN_INFO MODNAME |
304 | "Watchdog enabled. Timeout set to %d minute(s).\n", timeout); | |
00b3b3e6 SAMJ |
305 | |
306 | return nonseekable_open(inode, file); | |
307 | } | |
789fc0ad SAMJ |
308 | |
309 | /** | |
00b3b3e6 SAMJ |
310 | * pc87413_release: |
311 | * @inode: inode to board | |
312 | * @file: file handle to board | |
789fc0ad | 313 | * |
00b3b3e6 SAMJ |
314 | * The watchdog has a configurable API. There is a religious dispute |
315 | * between people who want their watchdog to be able to shut down and | |
316 | * those who want to be sure if the watchdog manager dies the machine | |
317 | * reboots. In the former case we disable the counters, in the latter | |
318 | * case you have to open it again very soon. | |
789fc0ad SAMJ |
319 | */ |
320 | ||
00b3b3e6 | 321 | static int pc87413_release(struct inode *inode, struct file *file) |
789fc0ad | 322 | { |
00b3b3e6 SAMJ |
323 | /* Shut off the timer. */ |
324 | ||
325 | if (expect_close == 42) { | |
326 | pc87413_disable(); | |
aee334c2 AC |
327 | printk(KERN_INFO MODNAME |
328 | "Watchdog disabled, sleeping again...\n"); | |
00b3b3e6 | 329 | } else { |
aee334c2 AC |
330 | printk(KERN_CRIT MODNAME |
331 | "Unexpected close, not stopping watchdog!\n"); | |
00b3b3e6 SAMJ |
332 | pc87413_refresh(); |
333 | } | |
00b3b3e6 SAMJ |
334 | clear_bit(0, &timer_enabled); |
335 | expect_close = 0; | |
00b3b3e6 | 336 | return 0; |
789fc0ad SAMJ |
337 | } |
338 | ||
00b3b3e6 SAMJ |
339 | /** |
340 | * pc87413_status: | |
341 | * | |
342 | * return, if the watchdog is enabled (timeout is set...) | |
343 | */ | |
344 | ||
345 | ||
346 | static int pc87413_status(void) | |
789fc0ad | 347 | { |
0835caa2 | 348 | return 0; /* currently not supported */ |
789fc0ad SAMJ |
349 | } |
350 | ||
351 | /** | |
352 | * pc87413_write: | |
353 | * @file: file handle to the watchdog | |
00b3b3e6 SAMJ |
354 | * @data: data buffer to write |
355 | * @len: length in bytes | |
789fc0ad SAMJ |
356 | * @ppos: pointer to the position to write. No seeks allowed |
357 | * | |
358 | * A write to a watchdog device is defined as a keepalive signal. Any | |
359 | * write of data will do, as we we don't define content meaning. | |
360 | */ | |
361 | ||
00b3b3e6 SAMJ |
362 | static ssize_t pc87413_write(struct file *file, const char __user *data, |
363 | size_t len, loff_t *ppos) | |
789fc0ad | 364 | { |
00b3b3e6 SAMJ |
365 | /* See if we got the magic character 'V' and reload the timer */ |
366 | if (len) { | |
367 | if (!nowayout) { | |
368 | size_t i; | |
369 | ||
370 | /* reset expect flag */ | |
371 | expect_close = 0; | |
372 | ||
aee334c2 AC |
373 | /* scan to see whether or not we got the |
374 | magic character */ | |
00b3b3e6 SAMJ |
375 | for (i = 0; i != len; i++) { |
376 | char c; | |
377 | if (get_user(c, data+i)) | |
378 | return -EFAULT; | |
379 | if (c == 'V') | |
380 | expect_close = 42; | |
381 | } | |
382 | } | |
383 | ||
384 | /* someone wrote to us, we should reload the timer */ | |
385 | pc87413_refresh(); | |
789fc0ad | 386 | } |
00b3b3e6 | 387 | return len; |
789fc0ad SAMJ |
388 | } |
389 | ||
00b3b3e6 | 390 | /** |
789fc0ad | 391 | * pc87413_ioctl: |
789fc0ad SAMJ |
392 | * @file: file handle to the device |
393 | * @cmd: watchdog command | |
394 | * @arg: argument pointer | |
395 | * | |
396 | * The watchdog API defines a common set of functions for all watchdogs | |
397 | * according to their available features. We only actually usefully support | |
398 | * querying capabilities and current status. | |
399 | */ | |
400 | ||
aee334c2 AC |
401 | static long pc87413_ioctl(struct file *file, unsigned int cmd, |
402 | unsigned long arg) | |
789fc0ad | 403 | { |
00b3b3e6 SAMJ |
404 | int new_timeout; |
405 | ||
406 | union { | |
407 | struct watchdog_info __user *ident; | |
408 | int __user *i; | |
409 | } uarg; | |
410 | ||
411 | static struct watchdog_info ident = { | |
412 | .options = WDIOF_KEEPALIVEPING | | |
aee334c2 AC |
413 | WDIOF_SETTIMEOUT | |
414 | WDIOF_MAGICCLOSE, | |
00b3b3e6 SAMJ |
415 | .firmware_version = 1, |
416 | .identity = "PC87413(HF/F) watchdog" | |
789fc0ad SAMJ |
417 | }; |
418 | ||
00b3b3e6 | 419 | uarg.i = (int __user *)arg; |
789fc0ad | 420 | |
aee334c2 AC |
421 | switch (cmd) { |
422 | case WDIOC_GETSUPPORT: | |
423 | return copy_to_user(uarg.ident, &ident, | |
424 | sizeof(ident)) ? -EFAULT : 0; | |
425 | case WDIOC_GETSTATUS: | |
426 | return put_user(pc87413_status(), uarg.i); | |
427 | case WDIOC_GETBOOTSTATUS: | |
428 | return put_user(0, uarg.i); | |
0c06090c WVS |
429 | case WDIOC_SETOPTIONS: |
430 | { | |
431 | int options, retval = -EINVAL; | |
432 | if (get_user(options, uarg.i)) | |
433 | return -EFAULT; | |
434 | if (options & WDIOS_DISABLECARD) { | |
435 | pc87413_disable(); | |
436 | retval = 0; | |
437 | } | |
438 | if (options & WDIOS_ENABLECARD) { | |
439 | pc87413_enable(); | |
440 | retval = 0; | |
441 | } | |
442 | return retval; | |
443 | } | |
aee334c2 AC |
444 | case WDIOC_KEEPALIVE: |
445 | pc87413_refresh(); | |
00b3b3e6 | 446 | #ifdef DEBUG |
aee334c2 | 447 | printk(KERN_INFO DPFX "keepalive\n"); |
00b3b3e6 | 448 | #endif |
aee334c2 AC |
449 | return 0; |
450 | case WDIOC_SETTIMEOUT: | |
451 | if (get_user(new_timeout, uarg.i)) | |
452 | return -EFAULT; | |
453 | /* the API states this is given in secs */ | |
454 | new_timeout /= 60; | |
455 | if (new_timeout < 0 || new_timeout > MAX_TIMEOUT) | |
456 | return -EINVAL; | |
457 | timeout = new_timeout; | |
458 | pc87413_refresh(); | |
459 | /* fall through and return the new timeout... */ | |
460 | case WDIOC_GETTIMEOUT: | |
461 | new_timeout = timeout * 60; | |
462 | return put_user(new_timeout, uarg.i); | |
aee334c2 AC |
463 | default: |
464 | return -ENOTTY; | |
789fc0ad | 465 | } |
789fc0ad SAMJ |
466 | } |
467 | ||
00b3b3e6 SAMJ |
468 | /* -- Notifier funtions -----------------------------------------*/ |
469 | ||
789fc0ad SAMJ |
470 | /** |
471 | * notify_sys: | |
472 | * @this: our notifier block | |
473 | * @code: the event being reported | |
474 | * @unused: unused | |
475 | * | |
476 | * Our notifier is called on system shutdowns. We want to turn the card | |
477 | * off at reboot otherwise the machine will reboot again during memory | |
478 | * test or worse yet during the following fsck. This would suck, in fact | |
479 | * trust me - if it happens it does suck. | |
480 | */ | |
481 | ||
00b3b3e6 SAMJ |
482 | static int pc87413_notify_sys(struct notifier_block *this, |
483 | unsigned long code, | |
484 | void *unused) | |
789fc0ad | 485 | { |
00b3b3e6 | 486 | if (code == SYS_DOWN || code == SYS_HALT) |
789fc0ad SAMJ |
487 | /* Turn the card off */ |
488 | pc87413_disable(); | |
789fc0ad SAMJ |
489 | return NOTIFY_DONE; |
490 | } | |
491 | ||
00b3b3e6 | 492 | /* -- Module's structures ---------------------------------------*/ |
789fc0ad | 493 | |
2b8693c0 | 494 | static const struct file_operations pc87413_fops = { |
789fc0ad | 495 | .owner = THIS_MODULE, |
00b3b3e6 | 496 | .llseek = no_llseek, |
789fc0ad | 497 | .write = pc87413_write, |
aee334c2 | 498 | .unlocked_ioctl = pc87413_ioctl, |
789fc0ad SAMJ |
499 | .open = pc87413_open, |
500 | .release = pc87413_release, | |
501 | }; | |
502 | ||
aee334c2 | 503 | static struct notifier_block pc87413_notifier = { |
00b3b3e6 | 504 | .notifier_call = pc87413_notify_sys, |
789fc0ad SAMJ |
505 | }; |
506 | ||
aee334c2 | 507 | static struct miscdevice pc87413_miscdev = { |
00b3b3e6 SAMJ |
508 | .minor = WATCHDOG_MINOR, |
509 | .name = "watchdog", | |
510 | .fops = &pc87413_fops | |
789fc0ad SAMJ |
511 | }; |
512 | ||
00b3b3e6 | 513 | /* -- Module init functions -------------------------------------*/ |
789fc0ad SAMJ |
514 | |
515 | /** | |
00b3b3e6 | 516 | * pc87413_init: module's "constructor" |
789fc0ad SAMJ |
517 | * |
518 | * Set up the WDT watchdog board. All we have to do is grab the | |
519 | * resources we require and bitch if anyone beat us to them. | |
520 | * The open() function will actually kick the board off. | |
521 | */ | |
522 | ||
00b3b3e6 | 523 | static int __init pc87413_init(void) |
789fc0ad SAMJ |
524 | { |
525 | int ret; | |
526 | ||
aee334c2 AC |
527 | printk(KERN_INFO PFX "Version " VERSION " at io 0x%X\n", |
528 | WDT_INDEX_IO_PORT); | |
789fc0ad SAMJ |
529 | |
530 | /* request_region(io, 2, "pc87413"); */ | |
531 | ||
789fc0ad SAMJ |
532 | ret = register_reboot_notifier(&pc87413_notifier); |
533 | if (ret != 0) { | |
aee334c2 AC |
534 | printk(KERN_ERR PFX |
535 | "cannot register reboot notifier (err=%d)\n", ret); | |
789fc0ad SAMJ |
536 | } |
537 | ||
789fc0ad | 538 | ret = misc_register(&pc87413_miscdev); |
789fc0ad | 539 | if (ret != 0) { |
00b3b3e6 SAMJ |
540 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", |
541 | WATCHDOG_MINOR, ret); | |
789fc0ad SAMJ |
542 | unregister_reboot_notifier(&pc87413_notifier); |
543 | return ret; | |
544 | } | |
00b3b3e6 | 545 | printk(KERN_INFO PFX "initialized. timeout=%d min \n", timeout); |
00b3b3e6 | 546 | pc87413_enable(); |
789fc0ad SAMJ |
547 | return 0; |
548 | } | |
549 | ||
00b3b3e6 SAMJ |
550 | /** |
551 | * pc87413_exit: module's "destructor" | |
552 | * | |
553 | * Unload the watchdog. You cannot do this with any file handles open. | |
554 | * If your watchdog is set to continue ticking on close and you unload | |
555 | * it, well it keeps ticking. We won't get the interrupt but the board | |
556 | * will not touch PC memory so all is fine. You just have to load a new | |
557 | * module in 60 seconds or reboot. | |
558 | */ | |
559 | ||
560 | static void __exit pc87413_exit(void) | |
561 | { | |
562 | /* Stop the timer before we leave */ | |
aee334c2 | 563 | if (!nowayout) { |
00b3b3e6 SAMJ |
564 | pc87413_disable(); |
565 | printk(KERN_INFO MODNAME "Watchdog disabled.\n"); | |
566 | } | |
567 | ||
568 | misc_deregister(&pc87413_miscdev); | |
569 | unregister_reboot_notifier(&pc87413_notifier); | |
570 | /* release_region(io,2); */ | |
571 | ||
572 | printk(MODNAME " watchdog component driver removed.\n"); | |
573 | } | |
789fc0ad SAMJ |
574 | |
575 | module_init(pc87413_init); | |
576 | module_exit(pc87413_exit); | |
577 | ||
00b3b3e6 | 578 | MODULE_AUTHOR("Sven Anders <anders@anduras.de>, Marcus Junker <junker@anduras.de>,"); |
789fc0ad | 579 | MODULE_DESCRIPTION("PC87413 WDT driver"); |
00b3b3e6 SAMJ |
580 | MODULE_LICENSE("GPL"); |
581 | ||
789fc0ad SAMJ |
582 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |
583 | ||
00b3b3e6 | 584 | module_param(io, int, 0); |
0835caa2 | 585 | MODULE_PARM_DESC(io, MODNAME " I/O port (default: " __MODULE_STRING(io) ")."); |
00b3b3e6 SAMJ |
586 | |
587 | module_param(timeout, int, 0); | |
aee334c2 AC |
588 | MODULE_PARM_DESC(timeout, |
589 | "Watchdog timeout in minutes (default=" | |
590 | __MODULE_STRING(timeout) ")."); | |
00b3b3e6 SAMJ |
591 | |
592 | module_param(nowayout, int, 0); | |
aee334c2 AC |
593 | MODULE_PARM_DESC(nowayout, |
594 | "Watchdog cannot be stopped once started (default=" | |
595 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
00b3b3e6 | 596 |