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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 | |
76550d32 RD |
56 | #define IO_DEFAULT 0x2E /* Address used on Portwell Boards */ |
57 | ||
58 | static int io = IO_DEFAULT; | |
789fc0ad | 59 | |
7944d3a5 | 60 | static int timeout = DEFAULT_TIMEOUT; /* timeout value */ |
aee334c2 | 61 | static unsigned long timer_enabled; /* is the timer enabled? */ |
789fc0ad | 62 | |
aee334c2 | 63 | static char expect_close; /* is the close expected? */ |
789fc0ad | 64 | |
aee334c2 | 65 | static DEFINE_SPINLOCK(io_lock); /* to guard us from io races */ |
789fc0ad | 66 | |
00b3b3e6 | 67 | static int nowayout = WATCHDOG_NOWAYOUT; |
789fc0ad | 68 | |
00b3b3e6 | 69 | /* -- Low level function ----------------------------------------*/ |
789fc0ad | 70 | |
00b3b3e6 | 71 | /* Select pins for Watchdog output */ |
789fc0ad | 72 | |
aee334c2 | 73 | static inline void pc87413_select_wdt_out(void) |
789fc0ad | 74 | { |
00b3b3e6 | 75 | unsigned int cr_data = 0; |
789fc0ad | 76 | |
00b3b3e6 | 77 | /* Step 1: Select multiple pin,pin55,as WDT output */ |
789fc0ad SAMJ |
78 | |
79 | outb_p(SIOCFG2, WDT_INDEX_IO_PORT); | |
80 | ||
aee334c2 | 81 | cr_data = inb(WDT_DATA_IO_PORT); |
789fc0ad SAMJ |
82 | |
83 | cr_data |= 0x80; /* Set Bit7 to 1*/ | |
84 | outb_p(SIOCFG2, WDT_INDEX_IO_PORT); | |
85 | ||
86 | outb_p(cr_data, WDT_DATA_IO_PORT); | |
87 | ||
00b3b3e6 | 88 | #ifdef DEBUG |
aee334c2 AC |
89 | printk(KERN_INFO DPFX |
90 | "Select multiple pin,pin55,as WDT output: Bit7 to 1: %d\n", | |
91 | cr_data); | |
00b3b3e6 | 92 | #endif |
789fc0ad SAMJ |
93 | } |
94 | ||
00b3b3e6 | 95 | /* Enable SWC functions */ |
789fc0ad | 96 | |
00b3b3e6 SAMJ |
97 | static inline void pc87413_enable_swc(void) |
98 | { | |
aee334c2 | 99 | unsigned int cr_data = 0; |
789fc0ad SAMJ |
100 | |
101 | /* Step 2: Enable SWC functions */ | |
102 | ||
7944d3a5 | 103 | outb_p(0x07, WDT_INDEX_IO_PORT); /* Point SWC_LDN (LDN=4) */ |
789fc0ad SAMJ |
104 | outb_p(SWC_LDN, WDT_DATA_IO_PORT); |
105 | ||
7944d3a5 | 106 | outb_p(0x30, WDT_INDEX_IO_PORT); /* Read Index 0x30 First */ |
00b3b3e6 | 107 | cr_data = inb(WDT_DATA_IO_PORT); |
7944d3a5 | 108 | cr_data |= 0x01; /* Set Bit0 to 1 */ |
789fc0ad | 109 | outb_p(0x30, WDT_INDEX_IO_PORT); |
7944d3a5 | 110 | outb_p(cr_data, WDT_DATA_IO_PORT); /* Index0x30_bit0P1 */ |
789fc0ad | 111 | |
00b3b3e6 | 112 | #ifdef DEBUG |
789fc0ad | 113 | printk(KERN_INFO DPFX "pc87413 - Enable SWC functions\n"); |
00b3b3e6 | 114 | #endif |
789fc0ad SAMJ |
115 | } |
116 | ||
00b3b3e6 SAMJ |
117 | /* Read SWC I/O base address */ |
118 | ||
119 | static inline unsigned int pc87413_get_swc_base(void) | |
789fc0ad | 120 | { |
00b3b3e6 SAMJ |
121 | unsigned int swc_base_addr = 0; |
122 | unsigned char addr_l, addr_h = 0; | |
789fc0ad SAMJ |
123 | |
124 | /* Step 3: Read SWC I/O Base Address */ | |
125 | ||
7944d3a5 | 126 | outb_p(0x60, WDT_INDEX_IO_PORT); /* Read Index 0x60 */ |
00b3b3e6 | 127 | addr_h = inb(WDT_DATA_IO_PORT); |
789fc0ad | 128 | |
7944d3a5 | 129 | outb_p(0x61, WDT_INDEX_IO_PORT); /* Read Index 0x61 */ |
789fc0ad | 130 | |
00b3b3e6 | 131 | addr_l = inb(WDT_DATA_IO_PORT); |
789fc0ad SAMJ |
132 | |
133 | swc_base_addr = (addr_h << 8) + addr_l; | |
00b3b3e6 | 134 | #ifdef DEBUG |
aee334c2 AC |
135 | printk(KERN_INFO DPFX |
136 | "Read SWC I/O Base Address: low %d, high %d, res %d\n", | |
137 | addr_l, addr_h, swc_base_addr); | |
00b3b3e6 | 138 | #endif |
789fc0ad SAMJ |
139 | return swc_base_addr; |
140 | } | |
141 | ||
00b3b3e6 SAMJ |
142 | /* Select Bank 3 of SWC */ |
143 | ||
144 | static inline void pc87413_swc_bank3(unsigned int swc_base_addr) | |
789fc0ad SAMJ |
145 | { |
146 | /* Step 4: Select Bank3 of SWC */ | |
00b3b3e6 | 147 | outb_p(inb(swc_base_addr + 0x0f) | 0x03, swc_base_addr + 0x0f); |
00b3b3e6 | 148 | #ifdef DEBUG |
789fc0ad | 149 | printk(KERN_INFO DPFX "Select Bank3 of SWC\n"); |
00b3b3e6 | 150 | #endif |
789fc0ad SAMJ |
151 | } |
152 | ||
00b3b3e6 SAMJ |
153 | /* Set watchdog timeout to x minutes */ |
154 | ||
155 | static inline void pc87413_programm_wdto(unsigned int swc_base_addr, | |
156 | char pc87413_time) | |
789fc0ad SAMJ |
157 | { |
158 | /* Step 5: Programm WDTO, Twd. */ | |
00b3b3e6 | 159 | outb_p(pc87413_time, swc_base_addr + WDTO); |
00b3b3e6 | 160 | #ifdef DEBUG |
789fc0ad | 161 | printk(KERN_INFO DPFX "Set WDTO to %d minutes\n", pc87413_time); |
00b3b3e6 | 162 | #endif |
789fc0ad SAMJ |
163 | } |
164 | ||
00b3b3e6 SAMJ |
165 | /* Enable WDEN */ |
166 | ||
167 | static inline void pc87413_enable_wden(unsigned int swc_base_addr) | |
789fc0ad SAMJ |
168 | { |
169 | /* Step 6: Enable WDEN */ | |
aee334c2 | 170 | outb_p(inb(swc_base_addr + WDCTL) | 0x01, swc_base_addr + WDCTL); |
00b3b3e6 | 171 | #ifdef DEBUG |
789fc0ad | 172 | printk(KERN_INFO DPFX "Enable WDEN\n"); |
00b3b3e6 | 173 | #endif |
789fc0ad SAMJ |
174 | } |
175 | ||
00b3b3e6 SAMJ |
176 | /* Enable SW_WD_TREN */ |
177 | static inline void pc87413_enable_sw_wd_tren(unsigned int swc_base_addr) | |
789fc0ad SAMJ |
178 | { |
179 | /* Enable SW_WD_TREN */ | |
aee334c2 | 180 | outb_p(inb(swc_base_addr + WDCFG) | 0x80, swc_base_addr + WDCFG); |
00b3b3e6 | 181 | #ifdef DEBUG |
789fc0ad | 182 | printk(KERN_INFO DPFX "Enable SW_WD_TREN\n"); |
00b3b3e6 | 183 | #endif |
789fc0ad SAMJ |
184 | } |
185 | ||
00b3b3e6 SAMJ |
186 | /* Disable SW_WD_TREN */ |
187 | ||
188 | static inline void pc87413_disable_sw_wd_tren(unsigned int swc_base_addr) | |
789fc0ad SAMJ |
189 | { |
190 | /* Disable SW_WD_TREN */ | |
aee334c2 | 191 | outb_p(inb(swc_base_addr + WDCFG) & 0x7f, swc_base_addr + WDCFG); |
00b3b3e6 | 192 | #ifdef DEBUG |
789fc0ad | 193 | printk(KERN_INFO DPFX "pc87413 - Disable SW_WD_TREN\n"); |
00b3b3e6 | 194 | #endif |
789fc0ad SAMJ |
195 | } |
196 | ||
00b3b3e6 | 197 | /* Enable SW_WD_TRG */ |
789fc0ad | 198 | |
00b3b3e6 | 199 | static inline void pc87413_enable_sw_wd_trg(unsigned int swc_base_addr) |
789fc0ad | 200 | { |
789fc0ad | 201 | /* Enable SW_WD_TRG */ |
aee334c2 | 202 | outb_p(inb(swc_base_addr + WDCTL) | 0x80, swc_base_addr + WDCTL); |
00b3b3e6 | 203 | #ifdef DEBUG |
789fc0ad | 204 | printk(KERN_INFO DPFX "pc87413 - Enable SW_WD_TRG\n"); |
00b3b3e6 | 205 | #endif |
789fc0ad SAMJ |
206 | } |
207 | ||
00b3b3e6 | 208 | /* Disable SW_WD_TRG */ |
789fc0ad | 209 | |
00b3b3e6 SAMJ |
210 | static inline void pc87413_disable_sw_wd_trg(unsigned int swc_base_addr) |
211 | { | |
789fc0ad | 212 | /* Disable SW_WD_TRG */ |
aee334c2 | 213 | outb_p(inb(swc_base_addr + WDCTL) & 0x7f, swc_base_addr + WDCTL); |
00b3b3e6 | 214 | #ifdef DEBUG |
789fc0ad | 215 | printk(KERN_INFO DPFX "Disable SW_WD_TRG\n"); |
00b3b3e6 | 216 | #endif |
789fc0ad SAMJ |
217 | } |
218 | ||
00b3b3e6 | 219 | /* -- Higher level functions ------------------------------------*/ |
789fc0ad | 220 | |
00b3b3e6 | 221 | /* Enable the watchdog */ |
789fc0ad | 222 | |
00b3b3e6 | 223 | static void pc87413_enable(void) |
789fc0ad | 224 | { |
00b3b3e6 SAMJ |
225 | unsigned int swc_base_addr; |
226 | ||
227 | spin_lock(&io_lock); | |
789fc0ad SAMJ |
228 | |
229 | pc87413_select_wdt_out(); | |
230 | pc87413_enable_swc(); | |
231 | swc_base_addr = pc87413_get_swc_base(); | |
232 | pc87413_swc_bank3(swc_base_addr); | |
00b3b3e6 SAMJ |
233 | pc87413_programm_wdto(swc_base_addr, timeout); |
234 | pc87413_enable_wden(swc_base_addr); | |
235 | pc87413_enable_sw_wd_tren(swc_base_addr); | |
236 | pc87413_enable_sw_wd_trg(swc_base_addr); | |
237 | ||
238 | spin_unlock(&io_lock); | |
789fc0ad SAMJ |
239 | } |
240 | ||
00b3b3e6 | 241 | /* Disable the watchdog */ |
789fc0ad | 242 | |
00b3b3e6 | 243 | static void pc87413_disable(void) |
789fc0ad | 244 | { |
00b3b3e6 SAMJ |
245 | unsigned int swc_base_addr; |
246 | ||
247 | spin_lock(&io_lock); | |
789fc0ad SAMJ |
248 | |
249 | pc87413_select_wdt_out(); | |
250 | pc87413_enable_swc(); | |
251 | swc_base_addr = pc87413_get_swc_base(); | |
252 | pc87413_swc_bank3(swc_base_addr); | |
253 | pc87413_disable_sw_wd_tren(swc_base_addr); | |
254 | pc87413_disable_sw_wd_trg(swc_base_addr); | |
00b3b3e6 SAMJ |
255 | pc87413_programm_wdto(swc_base_addr, 0); |
256 | ||
257 | spin_unlock(&io_lock); | |
789fc0ad SAMJ |
258 | } |
259 | ||
00b3b3e6 | 260 | /* Refresh the watchdog */ |
789fc0ad | 261 | |
00b3b3e6 | 262 | static void pc87413_refresh(void) |
789fc0ad | 263 | { |
00b3b3e6 SAMJ |
264 | unsigned int swc_base_addr; |
265 | ||
266 | spin_lock(&io_lock); | |
789fc0ad SAMJ |
267 | |
268 | pc87413_select_wdt_out(); | |
269 | pc87413_enable_swc(); | |
270 | swc_base_addr = pc87413_get_swc_base(); | |
271 | pc87413_swc_bank3(swc_base_addr); | |
00b3b3e6 SAMJ |
272 | pc87413_disable_sw_wd_tren(swc_base_addr); |
273 | pc87413_disable_sw_wd_trg(swc_base_addr); | |
274 | pc87413_programm_wdto(swc_base_addr, timeout); | |
789fc0ad SAMJ |
275 | pc87413_enable_wden(swc_base_addr); |
276 | pc87413_enable_sw_wd_tren(swc_base_addr); | |
277 | pc87413_enable_sw_wd_trg(swc_base_addr); | |
278 | ||
00b3b3e6 | 279 | spin_unlock(&io_lock); |
789fc0ad SAMJ |
280 | } |
281 | ||
00b3b3e6 SAMJ |
282 | /* -- File operations -------------------------------------------*/ |
283 | ||
284 | /** | |
285 | * pc87413_open: | |
286 | * @inode: inode of device | |
287 | * @file: file handle to device | |
288 | * | |
289 | */ | |
290 | ||
291 | static int pc87413_open(struct inode *inode, struct file *file) | |
292 | { | |
293 | /* /dev/watchdog can only be opened once */ | |
294 | ||
295 | if (test_and_set_bit(0, &timer_enabled)) | |
296 | return -EBUSY; | |
297 | ||
298 | if (nowayout) | |
299 | __module_get(THIS_MODULE); | |
789fc0ad | 300 | |
00b3b3e6 SAMJ |
301 | /* Reload and activate timer */ |
302 | pc87413_refresh(); | |
789fc0ad | 303 | |
aee334c2 AC |
304 | printk(KERN_INFO MODNAME |
305 | "Watchdog enabled. Timeout set to %d minute(s).\n", timeout); | |
00b3b3e6 SAMJ |
306 | |
307 | return nonseekable_open(inode, file); | |
308 | } | |
789fc0ad SAMJ |
309 | |
310 | /** | |
00b3b3e6 SAMJ |
311 | * pc87413_release: |
312 | * @inode: inode to board | |
313 | * @file: file handle to board | |
789fc0ad | 314 | * |
00b3b3e6 SAMJ |
315 | * The watchdog has a configurable API. There is a religious dispute |
316 | * between people who want their watchdog to be able to shut down and | |
317 | * those who want to be sure if the watchdog manager dies the machine | |
318 | * reboots. In the former case we disable the counters, in the latter | |
319 | * case you have to open it again very soon. | |
789fc0ad SAMJ |
320 | */ |
321 | ||
00b3b3e6 | 322 | static int pc87413_release(struct inode *inode, struct file *file) |
789fc0ad | 323 | { |
00b3b3e6 SAMJ |
324 | /* Shut off the timer. */ |
325 | ||
326 | if (expect_close == 42) { | |
327 | pc87413_disable(); | |
aee334c2 AC |
328 | printk(KERN_INFO MODNAME |
329 | "Watchdog disabled, sleeping again...\n"); | |
00b3b3e6 | 330 | } else { |
aee334c2 AC |
331 | printk(KERN_CRIT MODNAME |
332 | "Unexpected close, not stopping watchdog!\n"); | |
00b3b3e6 SAMJ |
333 | pc87413_refresh(); |
334 | } | |
00b3b3e6 SAMJ |
335 | clear_bit(0, &timer_enabled); |
336 | expect_close = 0; | |
00b3b3e6 | 337 | return 0; |
789fc0ad SAMJ |
338 | } |
339 | ||
00b3b3e6 SAMJ |
340 | /** |
341 | * pc87413_status: | |
342 | * | |
343 | * return, if the watchdog is enabled (timeout is set...) | |
344 | */ | |
345 | ||
346 | ||
347 | static int pc87413_status(void) | |
789fc0ad | 348 | { |
0835caa2 | 349 | return 0; /* currently not supported */ |
789fc0ad SAMJ |
350 | } |
351 | ||
352 | /** | |
353 | * pc87413_write: | |
354 | * @file: file handle to the watchdog | |
00b3b3e6 SAMJ |
355 | * @data: data buffer to write |
356 | * @len: length in bytes | |
789fc0ad SAMJ |
357 | * @ppos: pointer to the position to write. No seeks allowed |
358 | * | |
359 | * A write to a watchdog device is defined as a keepalive signal. Any | |
360 | * write of data will do, as we we don't define content meaning. | |
361 | */ | |
362 | ||
00b3b3e6 SAMJ |
363 | static ssize_t pc87413_write(struct file *file, const char __user *data, |
364 | size_t len, loff_t *ppos) | |
789fc0ad | 365 | { |
00b3b3e6 SAMJ |
366 | /* See if we got the magic character 'V' and reload the timer */ |
367 | if (len) { | |
368 | if (!nowayout) { | |
369 | size_t i; | |
370 | ||
371 | /* reset expect flag */ | |
372 | expect_close = 0; | |
373 | ||
aee334c2 AC |
374 | /* scan to see whether or not we got the |
375 | magic character */ | |
00b3b3e6 SAMJ |
376 | for (i = 0; i != len; i++) { |
377 | char c; | |
7944d3a5 | 378 | if (get_user(c, data + i)) |
00b3b3e6 SAMJ |
379 | return -EFAULT; |
380 | if (c == 'V') | |
381 | expect_close = 42; | |
382 | } | |
383 | } | |
384 | ||
385 | /* someone wrote to us, we should reload the timer */ | |
386 | pc87413_refresh(); | |
789fc0ad | 387 | } |
00b3b3e6 | 388 | return len; |
789fc0ad SAMJ |
389 | } |
390 | ||
00b3b3e6 | 391 | /** |
789fc0ad | 392 | * pc87413_ioctl: |
789fc0ad SAMJ |
393 | * @file: file handle to the device |
394 | * @cmd: watchdog command | |
395 | * @arg: argument pointer | |
396 | * | |
397 | * The watchdog API defines a common set of functions for all watchdogs | |
398 | * according to their available features. We only actually usefully support | |
399 | * querying capabilities and current status. | |
400 | */ | |
401 | ||
aee334c2 AC |
402 | static long pc87413_ioctl(struct file *file, unsigned int cmd, |
403 | unsigned long arg) | |
789fc0ad | 404 | { |
00b3b3e6 SAMJ |
405 | int new_timeout; |
406 | ||
407 | union { | |
408 | struct watchdog_info __user *ident; | |
409 | int __user *i; | |
410 | } uarg; | |
411 | ||
42747d71 | 412 | static const struct watchdog_info ident = { |
00b3b3e6 | 413 | .options = WDIOF_KEEPALIVEPING | |
aee334c2 AC |
414 | WDIOF_SETTIMEOUT | |
415 | WDIOF_MAGICCLOSE, | |
00b3b3e6 | 416 | .firmware_version = 1, |
7944d3a5 | 417 | .identity = "PC87413(HF/F) watchdog", |
789fc0ad SAMJ |
418 | }; |
419 | ||
00b3b3e6 | 420 | uarg.i = (int __user *)arg; |
789fc0ad | 421 | |
aee334c2 AC |
422 | switch (cmd) { |
423 | case WDIOC_GETSUPPORT: | |
424 | return copy_to_user(uarg.ident, &ident, | |
425 | sizeof(ident)) ? -EFAULT : 0; | |
426 | case WDIOC_GETSTATUS: | |
427 | return put_user(pc87413_status(), uarg.i); | |
428 | case WDIOC_GETBOOTSTATUS: | |
429 | return put_user(0, uarg.i); | |
0c06090c WVS |
430 | case WDIOC_SETOPTIONS: |
431 | { | |
432 | int options, retval = -EINVAL; | |
433 | if (get_user(options, uarg.i)) | |
434 | return -EFAULT; | |
435 | if (options & WDIOS_DISABLECARD) { | |
436 | pc87413_disable(); | |
437 | retval = 0; | |
438 | } | |
439 | if (options & WDIOS_ENABLECARD) { | |
440 | pc87413_enable(); | |
441 | retval = 0; | |
442 | } | |
443 | return retval; | |
444 | } | |
aee334c2 AC |
445 | case WDIOC_KEEPALIVE: |
446 | pc87413_refresh(); | |
00b3b3e6 | 447 | #ifdef DEBUG |
aee334c2 | 448 | printk(KERN_INFO DPFX "keepalive\n"); |
00b3b3e6 | 449 | #endif |
aee334c2 AC |
450 | return 0; |
451 | case WDIOC_SETTIMEOUT: | |
452 | if (get_user(new_timeout, uarg.i)) | |
453 | return -EFAULT; | |
454 | /* the API states this is given in secs */ | |
455 | new_timeout /= 60; | |
456 | if (new_timeout < 0 || new_timeout > MAX_TIMEOUT) | |
457 | return -EINVAL; | |
458 | timeout = new_timeout; | |
459 | pc87413_refresh(); | |
460 | /* fall through and return the new timeout... */ | |
461 | case WDIOC_GETTIMEOUT: | |
462 | new_timeout = timeout * 60; | |
463 | return put_user(new_timeout, uarg.i); | |
aee334c2 AC |
464 | default: |
465 | return -ENOTTY; | |
789fc0ad | 466 | } |
789fc0ad SAMJ |
467 | } |
468 | ||
00b3b3e6 SAMJ |
469 | /* -- Notifier funtions -----------------------------------------*/ |
470 | ||
789fc0ad SAMJ |
471 | /** |
472 | * notify_sys: | |
473 | * @this: our notifier block | |
474 | * @code: the event being reported | |
475 | * @unused: unused | |
476 | * | |
477 | * Our notifier is called on system shutdowns. We want to turn the card | |
478 | * off at reboot otherwise the machine will reboot again during memory | |
479 | * test or worse yet during the following fsck. This would suck, in fact | |
480 | * trust me - if it happens it does suck. | |
481 | */ | |
482 | ||
00b3b3e6 SAMJ |
483 | static int pc87413_notify_sys(struct notifier_block *this, |
484 | unsigned long code, | |
485 | void *unused) | |
789fc0ad | 486 | { |
00b3b3e6 | 487 | if (code == SYS_DOWN || code == SYS_HALT) |
789fc0ad SAMJ |
488 | /* Turn the card off */ |
489 | pc87413_disable(); | |
789fc0ad SAMJ |
490 | return NOTIFY_DONE; |
491 | } | |
492 | ||
00b3b3e6 | 493 | /* -- Module's structures ---------------------------------------*/ |
789fc0ad | 494 | |
2b8693c0 | 495 | static const struct file_operations pc87413_fops = { |
789fc0ad | 496 | .owner = THIS_MODULE, |
00b3b3e6 | 497 | .llseek = no_llseek, |
789fc0ad | 498 | .write = pc87413_write, |
aee334c2 | 499 | .unlocked_ioctl = pc87413_ioctl, |
789fc0ad SAMJ |
500 | .open = pc87413_open, |
501 | .release = pc87413_release, | |
502 | }; | |
503 | ||
aee334c2 | 504 | static struct notifier_block pc87413_notifier = { |
00b3b3e6 | 505 | .notifier_call = pc87413_notify_sys, |
789fc0ad SAMJ |
506 | }; |
507 | ||
aee334c2 | 508 | static struct miscdevice pc87413_miscdev = { |
00b3b3e6 SAMJ |
509 | .minor = WATCHDOG_MINOR, |
510 | .name = "watchdog", | |
7944d3a5 | 511 | .fops = &pc87413_fops, |
789fc0ad SAMJ |
512 | }; |
513 | ||
00b3b3e6 | 514 | /* -- Module init functions -------------------------------------*/ |
789fc0ad SAMJ |
515 | |
516 | /** | |
00b3b3e6 | 517 | * pc87413_init: module's "constructor" |
789fc0ad SAMJ |
518 | * |
519 | * Set up the WDT watchdog board. All we have to do is grab the | |
520 | * resources we require and bitch if anyone beat us to them. | |
521 | * The open() function will actually kick the board off. | |
522 | */ | |
523 | ||
00b3b3e6 | 524 | static int __init pc87413_init(void) |
789fc0ad SAMJ |
525 | { |
526 | int ret; | |
527 | ||
aee334c2 AC |
528 | printk(KERN_INFO PFX "Version " VERSION " at io 0x%X\n", |
529 | WDT_INDEX_IO_PORT); | |
789fc0ad SAMJ |
530 | |
531 | /* request_region(io, 2, "pc87413"); */ | |
532 | ||
789fc0ad SAMJ |
533 | ret = register_reboot_notifier(&pc87413_notifier); |
534 | if (ret != 0) { | |
aee334c2 AC |
535 | printk(KERN_ERR PFX |
536 | "cannot register reboot notifier (err=%d)\n", ret); | |
789fc0ad SAMJ |
537 | } |
538 | ||
789fc0ad | 539 | ret = misc_register(&pc87413_miscdev); |
789fc0ad | 540 | if (ret != 0) { |
143a2e54 WVS |
541 | printk(KERN_ERR PFX |
542 | "cannot register miscdev on minor=%d (err=%d)\n", | |
00b3b3e6 | 543 | WATCHDOG_MINOR, ret); |
789fc0ad SAMJ |
544 | unregister_reboot_notifier(&pc87413_notifier); |
545 | return ret; | |
546 | } | |
00b3b3e6 | 547 | printk(KERN_INFO PFX "initialized. timeout=%d min \n", timeout); |
00b3b3e6 | 548 | pc87413_enable(); |
789fc0ad SAMJ |
549 | return 0; |
550 | } | |
551 | ||
00b3b3e6 SAMJ |
552 | /** |
553 | * pc87413_exit: module's "destructor" | |
554 | * | |
555 | * Unload the watchdog. You cannot do this with any file handles open. | |
556 | * If your watchdog is set to continue ticking on close and you unload | |
557 | * it, well it keeps ticking. We won't get the interrupt but the board | |
558 | * will not touch PC memory so all is fine. You just have to load a new | |
559 | * module in 60 seconds or reboot. | |
560 | */ | |
561 | ||
562 | static void __exit pc87413_exit(void) | |
563 | { | |
564 | /* Stop the timer before we leave */ | |
aee334c2 | 565 | if (!nowayout) { |
00b3b3e6 SAMJ |
566 | pc87413_disable(); |
567 | printk(KERN_INFO MODNAME "Watchdog disabled.\n"); | |
568 | } | |
569 | ||
570 | misc_deregister(&pc87413_miscdev); | |
571 | unregister_reboot_notifier(&pc87413_notifier); | |
7944d3a5 | 572 | /* release_region(io, 2); */ |
00b3b3e6 | 573 | |
7944d3a5 | 574 | printk(KERN_INFO MODNAME " watchdog component driver removed.\n"); |
00b3b3e6 | 575 | } |
789fc0ad SAMJ |
576 | |
577 | module_init(pc87413_init); | |
578 | module_exit(pc87413_exit); | |
579 | ||
143a2e54 WVS |
580 | MODULE_AUTHOR("Sven Anders <anders@anduras.de>, " |
581 | "Marcus Junker <junker@anduras.de>,"); | |
789fc0ad | 582 | MODULE_DESCRIPTION("PC87413 WDT driver"); |
00b3b3e6 SAMJ |
583 | MODULE_LICENSE("GPL"); |
584 | ||
789fc0ad SAMJ |
585 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |
586 | ||
00b3b3e6 | 587 | module_param(io, int, 0); |
76550d32 RD |
588 | MODULE_PARM_DESC(io, MODNAME " I/O port (default: " |
589 | __MODULE_STRING(IO_DEFAULT) ")."); | |
00b3b3e6 SAMJ |
590 | |
591 | module_param(timeout, int, 0); | |
aee334c2 AC |
592 | MODULE_PARM_DESC(timeout, |
593 | "Watchdog timeout in minutes (default=" | |
76550d32 | 594 | __MODULE_STRING(DEFAULT_TIMEOUT) ")."); |
00b3b3e6 SAMJ |
595 | |
596 | module_param(nowayout, int, 0); | |
aee334c2 AC |
597 | MODULE_PARM_DESC(nowayout, |
598 | "Watchdog cannot be stopped once started (default=" | |
599 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
00b3b3e6 | 600 |