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> | |
aee334c2 AC |
33 | #include <linux/io.h> |
34 | #include <linux/uaccess.h> | |
789fc0ad | 35 | |
789fc0ad SAMJ |
36 | #include <asm/system.h> |
37 | ||
00b3b3e6 | 38 | /* #define DEBUG 1 */ |
789fc0ad | 39 | |
7944d3a5 | 40 | #define DEFAULT_TIMEOUT 1 /* 1 minute */ |
00b3b3e6 | 41 | #define MAX_TIMEOUT 255 |
789fc0ad | 42 | |
00b3b3e6 SAMJ |
43 | #define VERSION "1.1" |
44 | #define MODNAME "pc87413 WDT" | |
45 | #define PFX MODNAME ": " | |
46 | #define DPFX MODNAME " - DEBUG: " | |
789fc0ad | 47 | |
7944d3a5 | 48 | #define WDT_INDEX_IO_PORT (io+0) /* I/O port base (index register) */ |
00b3b3e6 SAMJ |
49 | #define WDT_DATA_IO_PORT (WDT_INDEX_IO_PORT+1) |
50 | #define SWC_LDN 0x04 | |
7944d3a5 WVS |
51 | #define SIOCFG2 0x22 /* Serial IO register */ |
52 | #define WDCTL 0x10 /* Watchdog-Timer-Controll-Register */ | |
53 | #define WDTO 0x11 /* Watchdog timeout register */ | |
54 | #define WDCFG 0x12 /* Watchdog config register */ | |
789fc0ad | 55 | |
7944d3a5 | 56 | static int io = 0x2E; /* Address used on Portwell Boards */ |
789fc0ad | 57 | |
7944d3a5 | 58 | static int timeout = DEFAULT_TIMEOUT; /* timeout value */ |
aee334c2 | 59 | static unsigned long timer_enabled; /* is the timer enabled? */ |
789fc0ad | 60 | |
aee334c2 | 61 | static char expect_close; /* is the close expected? */ |
789fc0ad | 62 | |
aee334c2 | 63 | static DEFINE_SPINLOCK(io_lock); /* to guard us from io races */ |
789fc0ad | 64 | |
00b3b3e6 | 65 | static int nowayout = WATCHDOG_NOWAYOUT; |
789fc0ad | 66 | |
00b3b3e6 | 67 | /* -- Low level function ----------------------------------------*/ |
789fc0ad | 68 | |
00b3b3e6 | 69 | /* Select pins for Watchdog output */ |
789fc0ad | 70 | |
aee334c2 | 71 | static inline void pc87413_select_wdt_out(void) |
789fc0ad | 72 | { |
00b3b3e6 | 73 | unsigned int cr_data = 0; |
789fc0ad | 74 | |
00b3b3e6 | 75 | /* Step 1: Select multiple pin,pin55,as WDT output */ |
789fc0ad SAMJ |
76 | |
77 | outb_p(SIOCFG2, WDT_INDEX_IO_PORT); | |
78 | ||
aee334c2 | 79 | cr_data = inb(WDT_DATA_IO_PORT); |
789fc0ad SAMJ |
80 | |
81 | cr_data |= 0x80; /* Set Bit7 to 1*/ | |
82 | outb_p(SIOCFG2, WDT_INDEX_IO_PORT); | |
83 | ||
84 | outb_p(cr_data, WDT_DATA_IO_PORT); | |
85 | ||
00b3b3e6 | 86 | #ifdef DEBUG |
aee334c2 AC |
87 | printk(KERN_INFO DPFX |
88 | "Select multiple pin,pin55,as WDT output: Bit7 to 1: %d\n", | |
89 | cr_data); | |
00b3b3e6 | 90 | #endif |
789fc0ad SAMJ |
91 | } |
92 | ||
00b3b3e6 | 93 | /* Enable SWC functions */ |
789fc0ad | 94 | |
00b3b3e6 SAMJ |
95 | static inline void pc87413_enable_swc(void) |
96 | { | |
aee334c2 | 97 | unsigned int cr_data = 0; |
789fc0ad SAMJ |
98 | |
99 | /* Step 2: Enable SWC functions */ | |
100 | ||
7944d3a5 | 101 | outb_p(0x07, WDT_INDEX_IO_PORT); /* Point SWC_LDN (LDN=4) */ |
789fc0ad SAMJ |
102 | outb_p(SWC_LDN, WDT_DATA_IO_PORT); |
103 | ||
7944d3a5 | 104 | outb_p(0x30, WDT_INDEX_IO_PORT); /* Read Index 0x30 First */ |
00b3b3e6 | 105 | cr_data = inb(WDT_DATA_IO_PORT); |
7944d3a5 | 106 | cr_data |= 0x01; /* Set Bit0 to 1 */ |
789fc0ad | 107 | outb_p(0x30, WDT_INDEX_IO_PORT); |
7944d3a5 | 108 | outb_p(cr_data, WDT_DATA_IO_PORT); /* Index0x30_bit0P1 */ |
789fc0ad | 109 | |
00b3b3e6 | 110 | #ifdef DEBUG |
789fc0ad | 111 | printk(KERN_INFO DPFX "pc87413 - Enable SWC functions\n"); |
00b3b3e6 | 112 | #endif |
789fc0ad SAMJ |
113 | } |
114 | ||
00b3b3e6 SAMJ |
115 | /* Read SWC I/O base address */ |
116 | ||
117 | static inline unsigned int pc87413_get_swc_base(void) | |
789fc0ad | 118 | { |
00b3b3e6 SAMJ |
119 | unsigned int swc_base_addr = 0; |
120 | unsigned char addr_l, addr_h = 0; | |
789fc0ad SAMJ |
121 | |
122 | /* Step 3: Read SWC I/O Base Address */ | |
123 | ||
7944d3a5 | 124 | outb_p(0x60, WDT_INDEX_IO_PORT); /* Read Index 0x60 */ |
00b3b3e6 | 125 | addr_h = inb(WDT_DATA_IO_PORT); |
789fc0ad | 126 | |
7944d3a5 | 127 | outb_p(0x61, WDT_INDEX_IO_PORT); /* Read Index 0x61 */ |
789fc0ad | 128 | |
00b3b3e6 | 129 | addr_l = inb(WDT_DATA_IO_PORT); |
789fc0ad SAMJ |
130 | |
131 | swc_base_addr = (addr_h << 8) + addr_l; | |
00b3b3e6 | 132 | #ifdef DEBUG |
aee334c2 AC |
133 | printk(KERN_INFO DPFX |
134 | "Read SWC I/O Base Address: low %d, high %d, res %d\n", | |
135 | addr_l, addr_h, swc_base_addr); | |
00b3b3e6 | 136 | #endif |
789fc0ad SAMJ |
137 | return swc_base_addr; |
138 | } | |
139 | ||
00b3b3e6 SAMJ |
140 | /* Select Bank 3 of SWC */ |
141 | ||
142 | static inline void pc87413_swc_bank3(unsigned int swc_base_addr) | |
789fc0ad SAMJ |
143 | { |
144 | /* Step 4: Select Bank3 of SWC */ | |
00b3b3e6 | 145 | outb_p(inb(swc_base_addr + 0x0f) | 0x03, swc_base_addr + 0x0f); |
00b3b3e6 | 146 | #ifdef DEBUG |
789fc0ad | 147 | printk(KERN_INFO DPFX "Select Bank3 of SWC\n"); |
00b3b3e6 | 148 | #endif |
789fc0ad SAMJ |
149 | } |
150 | ||
00b3b3e6 SAMJ |
151 | /* Set watchdog timeout to x minutes */ |
152 | ||
153 | static inline void pc87413_programm_wdto(unsigned int swc_base_addr, | |
154 | char pc87413_time) | |
789fc0ad SAMJ |
155 | { |
156 | /* Step 5: Programm WDTO, Twd. */ | |
00b3b3e6 | 157 | outb_p(pc87413_time, swc_base_addr + WDTO); |
00b3b3e6 | 158 | #ifdef DEBUG |
789fc0ad | 159 | printk(KERN_INFO DPFX "Set WDTO to %d minutes\n", pc87413_time); |
00b3b3e6 | 160 | #endif |
789fc0ad SAMJ |
161 | } |
162 | ||
00b3b3e6 SAMJ |
163 | /* Enable WDEN */ |
164 | ||
165 | static inline void pc87413_enable_wden(unsigned int swc_base_addr) | |
789fc0ad SAMJ |
166 | { |
167 | /* Step 6: Enable WDEN */ | |
aee334c2 | 168 | outb_p(inb(swc_base_addr + WDCTL) | 0x01, swc_base_addr + WDCTL); |
00b3b3e6 | 169 | #ifdef DEBUG |
789fc0ad | 170 | printk(KERN_INFO DPFX "Enable WDEN\n"); |
00b3b3e6 | 171 | #endif |
789fc0ad SAMJ |
172 | } |
173 | ||
00b3b3e6 SAMJ |
174 | /* Enable SW_WD_TREN */ |
175 | static inline void pc87413_enable_sw_wd_tren(unsigned int swc_base_addr) | |
789fc0ad SAMJ |
176 | { |
177 | /* Enable SW_WD_TREN */ | |
aee334c2 | 178 | outb_p(inb(swc_base_addr + WDCFG) | 0x80, swc_base_addr + WDCFG); |
00b3b3e6 | 179 | #ifdef DEBUG |
789fc0ad | 180 | printk(KERN_INFO DPFX "Enable SW_WD_TREN\n"); |
00b3b3e6 | 181 | #endif |
789fc0ad SAMJ |
182 | } |
183 | ||
00b3b3e6 SAMJ |
184 | /* Disable SW_WD_TREN */ |
185 | ||
186 | static inline void pc87413_disable_sw_wd_tren(unsigned int swc_base_addr) | |
789fc0ad SAMJ |
187 | { |
188 | /* Disable SW_WD_TREN */ | |
aee334c2 | 189 | outb_p(inb(swc_base_addr + WDCFG) & 0x7f, swc_base_addr + WDCFG); |
00b3b3e6 | 190 | #ifdef DEBUG |
789fc0ad | 191 | printk(KERN_INFO DPFX "pc87413 - Disable SW_WD_TREN\n"); |
00b3b3e6 | 192 | #endif |
789fc0ad SAMJ |
193 | } |
194 | ||
00b3b3e6 | 195 | /* Enable SW_WD_TRG */ |
789fc0ad | 196 | |
00b3b3e6 | 197 | static inline void pc87413_enable_sw_wd_trg(unsigned int swc_base_addr) |
789fc0ad | 198 | { |
789fc0ad | 199 | /* Enable SW_WD_TRG */ |
aee334c2 | 200 | outb_p(inb(swc_base_addr + WDCTL) | 0x80, swc_base_addr + WDCTL); |
00b3b3e6 | 201 | #ifdef DEBUG |
789fc0ad | 202 | printk(KERN_INFO DPFX "pc87413 - Enable SW_WD_TRG\n"); |
00b3b3e6 | 203 | #endif |
789fc0ad SAMJ |
204 | } |
205 | ||
00b3b3e6 | 206 | /* Disable SW_WD_TRG */ |
789fc0ad | 207 | |
00b3b3e6 SAMJ |
208 | static inline void pc87413_disable_sw_wd_trg(unsigned int swc_base_addr) |
209 | { | |
789fc0ad | 210 | /* Disable SW_WD_TRG */ |
aee334c2 | 211 | outb_p(inb(swc_base_addr + WDCTL) & 0x7f, swc_base_addr + WDCTL); |
00b3b3e6 | 212 | #ifdef DEBUG |
789fc0ad | 213 | printk(KERN_INFO DPFX "Disable SW_WD_TRG\n"); |
00b3b3e6 | 214 | #endif |
789fc0ad SAMJ |
215 | } |
216 | ||
00b3b3e6 | 217 | /* -- Higher level functions ------------------------------------*/ |
789fc0ad | 218 | |
00b3b3e6 | 219 | /* Enable the watchdog */ |
789fc0ad | 220 | |
00b3b3e6 | 221 | static void pc87413_enable(void) |
789fc0ad | 222 | { |
00b3b3e6 SAMJ |
223 | unsigned int swc_base_addr; |
224 | ||
225 | spin_lock(&io_lock); | |
789fc0ad SAMJ |
226 | |
227 | pc87413_select_wdt_out(); | |
228 | pc87413_enable_swc(); | |
229 | swc_base_addr = pc87413_get_swc_base(); | |
230 | pc87413_swc_bank3(swc_base_addr); | |
00b3b3e6 SAMJ |
231 | pc87413_programm_wdto(swc_base_addr, timeout); |
232 | pc87413_enable_wden(swc_base_addr); | |
233 | pc87413_enable_sw_wd_tren(swc_base_addr); | |
234 | pc87413_enable_sw_wd_trg(swc_base_addr); | |
235 | ||
236 | spin_unlock(&io_lock); | |
789fc0ad SAMJ |
237 | } |
238 | ||
00b3b3e6 | 239 | /* Disable the watchdog */ |
789fc0ad | 240 | |
00b3b3e6 | 241 | static void pc87413_disable(void) |
789fc0ad | 242 | { |
00b3b3e6 SAMJ |
243 | unsigned int swc_base_addr; |
244 | ||
245 | spin_lock(&io_lock); | |
789fc0ad SAMJ |
246 | |
247 | pc87413_select_wdt_out(); | |
248 | pc87413_enable_swc(); | |
249 | swc_base_addr = pc87413_get_swc_base(); | |
250 | pc87413_swc_bank3(swc_base_addr); | |
251 | pc87413_disable_sw_wd_tren(swc_base_addr); | |
252 | pc87413_disable_sw_wd_trg(swc_base_addr); | |
00b3b3e6 SAMJ |
253 | pc87413_programm_wdto(swc_base_addr, 0); |
254 | ||
255 | spin_unlock(&io_lock); | |
789fc0ad SAMJ |
256 | } |
257 | ||
00b3b3e6 | 258 | /* Refresh the watchdog */ |
789fc0ad | 259 | |
00b3b3e6 | 260 | static void pc87413_refresh(void) |
789fc0ad | 261 | { |
00b3b3e6 SAMJ |
262 | unsigned int swc_base_addr; |
263 | ||
264 | spin_lock(&io_lock); | |
789fc0ad SAMJ |
265 | |
266 | pc87413_select_wdt_out(); | |
267 | pc87413_enable_swc(); | |
268 | swc_base_addr = pc87413_get_swc_base(); | |
269 | pc87413_swc_bank3(swc_base_addr); | |
00b3b3e6 SAMJ |
270 | pc87413_disable_sw_wd_tren(swc_base_addr); |
271 | pc87413_disable_sw_wd_trg(swc_base_addr); | |
272 | pc87413_programm_wdto(swc_base_addr, timeout); | |
789fc0ad SAMJ |
273 | pc87413_enable_wden(swc_base_addr); |
274 | pc87413_enable_sw_wd_tren(swc_base_addr); | |
275 | pc87413_enable_sw_wd_trg(swc_base_addr); | |
276 | ||
00b3b3e6 | 277 | spin_unlock(&io_lock); |
789fc0ad SAMJ |
278 | } |
279 | ||
00b3b3e6 SAMJ |
280 | /* -- File operations -------------------------------------------*/ |
281 | ||
282 | /** | |
283 | * pc87413_open: | |
284 | * @inode: inode of device | |
285 | * @file: file handle to device | |
286 | * | |
287 | */ | |
288 | ||
289 | static int pc87413_open(struct inode *inode, struct file *file) | |
290 | { | |
291 | /* /dev/watchdog can only be opened once */ | |
292 | ||
293 | if (test_and_set_bit(0, &timer_enabled)) | |
294 | return -EBUSY; | |
295 | ||
296 | if (nowayout) | |
297 | __module_get(THIS_MODULE); | |
789fc0ad | 298 | |
00b3b3e6 SAMJ |
299 | /* Reload and activate timer */ |
300 | pc87413_refresh(); | |
789fc0ad | 301 | |
aee334c2 AC |
302 | printk(KERN_INFO MODNAME |
303 | "Watchdog enabled. Timeout set to %d minute(s).\n", timeout); | |
00b3b3e6 SAMJ |
304 | |
305 | return nonseekable_open(inode, file); | |
306 | } | |
789fc0ad SAMJ |
307 | |
308 | /** | |
00b3b3e6 SAMJ |
309 | * pc87413_release: |
310 | * @inode: inode to board | |
311 | * @file: file handle to board | |
789fc0ad | 312 | * |
00b3b3e6 SAMJ |
313 | * The watchdog has a configurable API. There is a religious dispute |
314 | * between people who want their watchdog to be able to shut down and | |
315 | * those who want to be sure if the watchdog manager dies the machine | |
316 | * reboots. In the former case we disable the counters, in the latter | |
317 | * case you have to open it again very soon. | |
789fc0ad SAMJ |
318 | */ |
319 | ||
00b3b3e6 | 320 | static int pc87413_release(struct inode *inode, struct file *file) |
789fc0ad | 321 | { |
00b3b3e6 SAMJ |
322 | /* Shut off the timer. */ |
323 | ||
324 | if (expect_close == 42) { | |
325 | pc87413_disable(); | |
aee334c2 AC |
326 | printk(KERN_INFO MODNAME |
327 | "Watchdog disabled, sleeping again...\n"); | |
00b3b3e6 | 328 | } else { |
aee334c2 AC |
329 | printk(KERN_CRIT MODNAME |
330 | "Unexpected close, not stopping watchdog!\n"); | |
00b3b3e6 SAMJ |
331 | pc87413_refresh(); |
332 | } | |
00b3b3e6 SAMJ |
333 | clear_bit(0, &timer_enabled); |
334 | expect_close = 0; | |
00b3b3e6 | 335 | return 0; |
789fc0ad SAMJ |
336 | } |
337 | ||
00b3b3e6 SAMJ |
338 | /** |
339 | * pc87413_status: | |
340 | * | |
341 | * return, if the watchdog is enabled (timeout is set...) | |
342 | */ | |
343 | ||
344 | ||
345 | static int pc87413_status(void) | |
789fc0ad | 346 | { |
0835caa2 | 347 | return 0; /* currently not supported */ |
789fc0ad SAMJ |
348 | } |
349 | ||
350 | /** | |
351 | * pc87413_write: | |
352 | * @file: file handle to the watchdog | |
00b3b3e6 SAMJ |
353 | * @data: data buffer to write |
354 | * @len: length in bytes | |
789fc0ad SAMJ |
355 | * @ppos: pointer to the position to write. No seeks allowed |
356 | * | |
357 | * A write to a watchdog device is defined as a keepalive signal. Any | |
358 | * write of data will do, as we we don't define content meaning. | |
359 | */ | |
360 | ||
00b3b3e6 SAMJ |
361 | static ssize_t pc87413_write(struct file *file, const char __user *data, |
362 | size_t len, loff_t *ppos) | |
789fc0ad | 363 | { |
00b3b3e6 SAMJ |
364 | /* See if we got the magic character 'V' and reload the timer */ |
365 | if (len) { | |
366 | if (!nowayout) { | |
367 | size_t i; | |
368 | ||
369 | /* reset expect flag */ | |
370 | expect_close = 0; | |
371 | ||
aee334c2 AC |
372 | /* scan to see whether or not we got the |
373 | magic character */ | |
00b3b3e6 SAMJ |
374 | for (i = 0; i != len; i++) { |
375 | char c; | |
7944d3a5 | 376 | if (get_user(c, data + i)) |
00b3b3e6 SAMJ |
377 | return -EFAULT; |
378 | if (c == 'V') | |
379 | expect_close = 42; | |
380 | } | |
381 | } | |
382 | ||
383 | /* someone wrote to us, we should reload the timer */ | |
384 | pc87413_refresh(); | |
789fc0ad | 385 | } |
00b3b3e6 | 386 | return len; |
789fc0ad SAMJ |
387 | } |
388 | ||
00b3b3e6 | 389 | /** |
789fc0ad | 390 | * pc87413_ioctl: |
789fc0ad SAMJ |
391 | * @file: file handle to the device |
392 | * @cmd: watchdog command | |
393 | * @arg: argument pointer | |
394 | * | |
395 | * The watchdog API defines a common set of functions for all watchdogs | |
396 | * according to their available features. We only actually usefully support | |
397 | * querying capabilities and current status. | |
398 | */ | |
399 | ||
aee334c2 AC |
400 | static long pc87413_ioctl(struct file *file, unsigned int cmd, |
401 | unsigned long arg) | |
789fc0ad | 402 | { |
00b3b3e6 SAMJ |
403 | int new_timeout; |
404 | ||
405 | union { | |
406 | struct watchdog_info __user *ident; | |
407 | int __user *i; | |
408 | } uarg; | |
409 | ||
410 | static struct watchdog_info ident = { | |
411 | .options = WDIOF_KEEPALIVEPING | | |
aee334c2 AC |
412 | WDIOF_SETTIMEOUT | |
413 | WDIOF_MAGICCLOSE, | |
00b3b3e6 | 414 | .firmware_version = 1, |
7944d3a5 | 415 | .identity = "PC87413(HF/F) watchdog", |
789fc0ad SAMJ |
416 | }; |
417 | ||
00b3b3e6 | 418 | uarg.i = (int __user *)arg; |
789fc0ad | 419 | |
aee334c2 AC |
420 | switch (cmd) { |
421 | case WDIOC_GETSUPPORT: | |
422 | return copy_to_user(uarg.ident, &ident, | |
423 | sizeof(ident)) ? -EFAULT : 0; | |
424 | case WDIOC_GETSTATUS: | |
425 | return put_user(pc87413_status(), uarg.i); | |
426 | case WDIOC_GETBOOTSTATUS: | |
427 | return put_user(0, uarg.i); | |
0c06090c WVS |
428 | case WDIOC_SETOPTIONS: |
429 | { | |
430 | int options, retval = -EINVAL; | |
431 | if (get_user(options, uarg.i)) | |
432 | return -EFAULT; | |
433 | if (options & WDIOS_DISABLECARD) { | |
434 | pc87413_disable(); | |
435 | retval = 0; | |
436 | } | |
437 | if (options & WDIOS_ENABLECARD) { | |
438 | pc87413_enable(); | |
439 | retval = 0; | |
440 | } | |
441 | return retval; | |
442 | } | |
aee334c2 AC |
443 | case WDIOC_KEEPALIVE: |
444 | pc87413_refresh(); | |
00b3b3e6 | 445 | #ifdef DEBUG |
aee334c2 | 446 | printk(KERN_INFO DPFX "keepalive\n"); |
00b3b3e6 | 447 | #endif |
aee334c2 AC |
448 | return 0; |
449 | case WDIOC_SETTIMEOUT: | |
450 | if (get_user(new_timeout, uarg.i)) | |
451 | return -EFAULT; | |
452 | /* the API states this is given in secs */ | |
453 | new_timeout /= 60; | |
454 | if (new_timeout < 0 || new_timeout > MAX_TIMEOUT) | |
455 | return -EINVAL; | |
456 | timeout = new_timeout; | |
457 | pc87413_refresh(); | |
458 | /* fall through and return the new timeout... */ | |
459 | case WDIOC_GETTIMEOUT: | |
460 | new_timeout = timeout * 60; | |
461 | return put_user(new_timeout, uarg.i); | |
aee334c2 AC |
462 | default: |
463 | return -ENOTTY; | |
789fc0ad | 464 | } |
789fc0ad SAMJ |
465 | } |
466 | ||
00b3b3e6 SAMJ |
467 | /* -- Notifier funtions -----------------------------------------*/ |
468 | ||
789fc0ad SAMJ |
469 | /** |
470 | * notify_sys: | |
471 | * @this: our notifier block | |
472 | * @code: the event being reported | |
473 | * @unused: unused | |
474 | * | |
475 | * Our notifier is called on system shutdowns. We want to turn the card | |
476 | * off at reboot otherwise the machine will reboot again during memory | |
477 | * test or worse yet during the following fsck. This would suck, in fact | |
478 | * trust me - if it happens it does suck. | |
479 | */ | |
480 | ||
00b3b3e6 SAMJ |
481 | static int pc87413_notify_sys(struct notifier_block *this, |
482 | unsigned long code, | |
483 | void *unused) | |
789fc0ad | 484 | { |
00b3b3e6 | 485 | if (code == SYS_DOWN || code == SYS_HALT) |
789fc0ad SAMJ |
486 | /* Turn the card off */ |
487 | pc87413_disable(); | |
789fc0ad SAMJ |
488 | return NOTIFY_DONE; |
489 | } | |
490 | ||
00b3b3e6 | 491 | /* -- Module's structures ---------------------------------------*/ |
789fc0ad | 492 | |
2b8693c0 | 493 | static const struct file_operations pc87413_fops = { |
789fc0ad | 494 | .owner = THIS_MODULE, |
00b3b3e6 | 495 | .llseek = no_llseek, |
789fc0ad | 496 | .write = pc87413_write, |
aee334c2 | 497 | .unlocked_ioctl = pc87413_ioctl, |
789fc0ad SAMJ |
498 | .open = pc87413_open, |
499 | .release = pc87413_release, | |
500 | }; | |
501 | ||
aee334c2 | 502 | static struct notifier_block pc87413_notifier = { |
00b3b3e6 | 503 | .notifier_call = pc87413_notify_sys, |
789fc0ad SAMJ |
504 | }; |
505 | ||
aee334c2 | 506 | static struct miscdevice pc87413_miscdev = { |
00b3b3e6 SAMJ |
507 | .minor = WATCHDOG_MINOR, |
508 | .name = "watchdog", | |
7944d3a5 | 509 | .fops = &pc87413_fops, |
789fc0ad SAMJ |
510 | }; |
511 | ||
00b3b3e6 | 512 | /* -- Module init functions -------------------------------------*/ |
789fc0ad SAMJ |
513 | |
514 | /** | |
00b3b3e6 | 515 | * pc87413_init: module's "constructor" |
789fc0ad SAMJ |
516 | * |
517 | * Set up the WDT watchdog board. All we have to do is grab the | |
518 | * resources we require and bitch if anyone beat us to them. | |
519 | * The open() function will actually kick the board off. | |
520 | */ | |
521 | ||
00b3b3e6 | 522 | static int __init pc87413_init(void) |
789fc0ad SAMJ |
523 | { |
524 | int ret; | |
525 | ||
aee334c2 AC |
526 | printk(KERN_INFO PFX "Version " VERSION " at io 0x%X\n", |
527 | WDT_INDEX_IO_PORT); | |
789fc0ad SAMJ |
528 | |
529 | /* request_region(io, 2, "pc87413"); */ | |
530 | ||
789fc0ad SAMJ |
531 | ret = register_reboot_notifier(&pc87413_notifier); |
532 | if (ret != 0) { | |
aee334c2 AC |
533 | printk(KERN_ERR PFX |
534 | "cannot register reboot notifier (err=%d)\n", ret); | |
789fc0ad SAMJ |
535 | } |
536 | ||
789fc0ad | 537 | ret = misc_register(&pc87413_miscdev); |
789fc0ad | 538 | if (ret != 0) { |
143a2e54 WVS |
539 | printk(KERN_ERR PFX |
540 | "cannot register miscdev on minor=%d (err=%d)\n", | |
00b3b3e6 | 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); | |
7944d3a5 | 570 | /* release_region(io, 2); */ |
00b3b3e6 | 571 | |
7944d3a5 | 572 | printk(KERN_INFO MODNAME " watchdog component driver removed.\n"); |
00b3b3e6 | 573 | } |
789fc0ad SAMJ |
574 | |
575 | module_init(pc87413_init); | |
576 | module_exit(pc87413_exit); | |
577 | ||
143a2e54 WVS |
578 | MODULE_AUTHOR("Sven Anders <anders@anduras.de>, " |
579 | "Marcus Junker <junker@anduras.de>,"); | |
789fc0ad | 580 | MODULE_DESCRIPTION("PC87413 WDT driver"); |
00b3b3e6 SAMJ |
581 | MODULE_LICENSE("GPL"); |
582 | ||
789fc0ad SAMJ |
583 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |
584 | ||
00b3b3e6 | 585 | module_param(io, int, 0); |
0835caa2 | 586 | MODULE_PARM_DESC(io, MODNAME " I/O port (default: " __MODULE_STRING(io) ")."); |
00b3b3e6 SAMJ |
587 | |
588 | module_param(timeout, int, 0); | |
aee334c2 AC |
589 | MODULE_PARM_DESC(timeout, |
590 | "Watchdog timeout in minutes (default=" | |
591 | __MODULE_STRING(timeout) ")."); | |
00b3b3e6 SAMJ |
592 | |
593 | module_param(nowayout, int, 0); | |
aee334c2 AC |
594 | MODULE_PARM_DESC(nowayout, |
595 | "Watchdog cannot be stopped once started (default=" | |
596 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
00b3b3e6 | 597 |