Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 2 | * Wdt977 0.04: A Watchdog Device for Netwinder W83977AF chip |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * (c) Copyright 1998 Rebel.com (Woody Suwalski <woody@netwinder.org>) |
| 5 | * |
| 6 | * ----------------------- |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * as published by the Free Software Foundation; either version |
| 11 | * 2 of the License, or (at your option) any later version. |
| 12 | * |
| 13 | * ----------------------- |
| 14 | * 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com> |
| 15 | * Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT |
| 16 | * 19-Dec-2001 Woody Suwalski: Netwinder fixes, ioctl interface |
| 17 | * 06-Jan-2002 Woody Suwalski: For compatibility, convert all timeouts |
| 18 | * from minutes to seconds. |
| 19 | * 07-Jul-2003 Daniele Bellucci: Audit return code of misc_register in |
| 20 | * nwwatchdog_init. |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 21 | * 25-Oct-2005 Woody Suwalski: Convert addresses to #defs, add spinlocks |
| 22 | * remove limitiation to be used on Netwinders only |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | */ |
| 24 | |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/moduleparam.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <linux/types.h> |
| 28 | #include <linux/kernel.h> |
| 29 | #include <linux/fs.h> |
| 30 | #include <linux/miscdevice.h> |
| 31 | #include <linux/init.h> |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 32 | #include <linux/ioport.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/watchdog.h> |
| 34 | #include <linux/notifier.h> |
| 35 | #include <linux/reboot.h> |
| 36 | |
| 37 | #include <asm/io.h> |
| 38 | #include <asm/system.h> |
| 39 | #include <asm/mach-types.h> |
| 40 | #include <asm/uaccess.h> |
| 41 | |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 42 | #define WATCHDOG_VERSION "0.04" |
| 43 | #define WATCHDOG_NAME "Wdt977" |
| 44 | #define PFX WATCHDOG_NAME ": " |
| 45 | #define DRIVER_VERSION WATCHDOG_NAME " driver, v" WATCHDOG_VERSION "\n" |
| 46 | |
| 47 | #define IO_INDEX_PORT 0x370 /* on some systems it can be 0x3F0 */ |
| 48 | #define IO_DATA_PORT (IO_INDEX_PORT+1) |
| 49 | |
| 50 | #define UNLOCK_DATA 0x87 |
| 51 | #define LOCK_DATA 0xAA |
| 52 | #define DEVICE_REGISTER 0x07 |
| 53 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
| 55 | #define DEFAULT_TIMEOUT 60 /* default timeout in seconds */ |
| 56 | |
| 57 | static int timeout = DEFAULT_TIMEOUT; |
| 58 | static int timeoutM; /* timeout in minutes */ |
| 59 | static unsigned long timer_alive; |
| 60 | static int testmode; |
| 61 | static char expect_close; |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 62 | static spinlock_t spinlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
| 64 | module_param(timeout, int, 0); |
| 65 | MODULE_PARM_DESC(timeout,"Watchdog timeout in seconds (60..15300), default=" __MODULE_STRING(DEFAULT_TIMEOUT) ")"); |
| 66 | module_param(testmode, int, 0); |
| 67 | MODULE_PARM_DESC(testmode,"Watchdog testmode (1 = no reboot), default=0"); |
| 68 | |
Andrey Panin | 4bfdf37 | 2005-07-27 11:43:58 -0700 | [diff] [blame] | 69 | static int nowayout = WATCHDOG_NOWAYOUT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | module_param(nowayout, int, 0); |
Wim Van Sebroeck | bffda5c | 2007-01-27 20:54:24 +0100 | [diff] [blame^] | 71 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
| 73 | /* |
| 74 | * Start the watchdog |
| 75 | */ |
| 76 | |
| 77 | static int wdt977_start(void) |
| 78 | { |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 79 | unsigned long flags; |
| 80 | |
| 81 | spin_lock_irqsave(&spinlock, flags); |
| 82 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | /* unlock the SuperIO chip */ |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 84 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
| 85 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
| 87 | /* select device Aux2 (device=8) and set watchdog regs F2, F3 and F4 |
| 88 | * F2 has the timeout in minutes |
| 89 | * F3 could be set to the POWER LED blink (with GP17 set to PowerLed) |
| 90 | * at timeout, and to reset timer on kbd/mouse activity (not impl.) |
| 91 | * F4 is used to just clear the TIMEOUT'ed state (bit 0) |
| 92 | */ |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 93 | outb_p(DEVICE_REGISTER, IO_INDEX_PORT); |
| 94 | outb_p(0x08, IO_DATA_PORT); |
| 95 | outb_p(0xF2, IO_INDEX_PORT); |
| 96 | outb_p(timeoutM, IO_DATA_PORT); |
| 97 | outb_p(0xF3, IO_INDEX_PORT); |
| 98 | outb_p(0x00, IO_DATA_PORT); /* another setting is 0E for kbd/mouse/LED */ |
| 99 | outb_p(0xF4, IO_INDEX_PORT); |
| 100 | outb_p(0x00, IO_DATA_PORT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | |
| 102 | /* at last select device Aux1 (dev=7) and set GP16 as a watchdog output */ |
| 103 | /* in test mode watch the bit 1 on F4 to indicate "triggered" */ |
| 104 | if (!testmode) |
| 105 | { |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 106 | outb_p(DEVICE_REGISTER, IO_INDEX_PORT); |
| 107 | outb_p(0x07, IO_DATA_PORT); |
| 108 | outb_p(0xE6, IO_INDEX_PORT); |
| 109 | outb_p(0x08, IO_DATA_PORT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | } |
| 111 | |
| 112 | /* lock the SuperIO chip */ |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 113 | outb_p(LOCK_DATA, IO_INDEX_PORT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 115 | spin_unlock_irqrestore(&spinlock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | printk(KERN_INFO PFX "activated.\n"); |
| 117 | |
| 118 | return 0; |
| 119 | } |
| 120 | |
| 121 | /* |
| 122 | * Stop the watchdog |
| 123 | */ |
| 124 | |
| 125 | static int wdt977_stop(void) |
| 126 | { |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 127 | unsigned long flags; |
| 128 | spin_lock_irqsave(&spinlock, flags); |
| 129 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | /* unlock the SuperIO chip */ |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 131 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
| 132 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
| 134 | /* select device Aux2 (device=8) and set watchdog regs F2,F3 and F4 |
| 135 | * F3 is reset to its default state |
| 136 | * F4 can clear the TIMEOUT'ed state (bit 0) - back to default |
| 137 | * We can not use GP17 as a PowerLed, as we use its usage as a RedLed |
| 138 | */ |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 139 | outb_p(DEVICE_REGISTER, IO_INDEX_PORT); |
| 140 | outb_p(0x08, IO_DATA_PORT); |
| 141 | outb_p(0xF2, IO_INDEX_PORT); |
| 142 | outb_p(0xFF, IO_DATA_PORT); |
| 143 | outb_p(0xF3, IO_INDEX_PORT); |
| 144 | outb_p(0x00, IO_DATA_PORT); |
| 145 | outb_p(0xF4, IO_INDEX_PORT); |
| 146 | outb_p(0x00, IO_DATA_PORT); |
| 147 | outb_p(0xF2, IO_INDEX_PORT); |
| 148 | outb_p(0x00, IO_DATA_PORT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
| 150 | /* at last select device Aux1 (dev=7) and set GP16 as a watchdog output */ |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 151 | outb_p(DEVICE_REGISTER, IO_INDEX_PORT); |
| 152 | outb_p(0x07, IO_DATA_PORT); |
| 153 | outb_p(0xE6, IO_INDEX_PORT); |
| 154 | outb_p(0x08, IO_DATA_PORT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
| 156 | /* lock the SuperIO chip */ |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 157 | outb_p(LOCK_DATA, IO_INDEX_PORT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 159 | spin_unlock_irqrestore(&spinlock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | printk(KERN_INFO PFX "shutdown.\n"); |
| 161 | |
| 162 | return 0; |
| 163 | } |
| 164 | |
| 165 | /* |
| 166 | * Send a keepalive ping to the watchdog |
| 167 | * This is done by simply re-writing the timeout to reg. 0xF2 |
| 168 | */ |
| 169 | |
| 170 | static int wdt977_keepalive(void) |
| 171 | { |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 172 | unsigned long flags; |
| 173 | spin_lock_irqsave(&spinlock, flags); |
| 174 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | /* unlock the SuperIO chip */ |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 176 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
| 177 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | |
| 179 | /* select device Aux2 (device=8) and kicks watchdog reg F2 */ |
| 180 | /* F2 has the timeout in minutes */ |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 181 | outb_p(DEVICE_REGISTER, IO_INDEX_PORT); |
| 182 | outb_p(0x08, IO_DATA_PORT); |
| 183 | outb_p(0xF2, IO_INDEX_PORT); |
| 184 | outb_p(timeoutM, IO_DATA_PORT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | |
| 186 | /* lock the SuperIO chip */ |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 187 | outb_p(LOCK_DATA, IO_INDEX_PORT); |
| 188 | spin_unlock_irqrestore(&spinlock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | /* |
| 194 | * Set the watchdog timeout value |
| 195 | */ |
| 196 | |
| 197 | static int wdt977_set_timeout(int t) |
| 198 | { |
| 199 | int tmrval; |
| 200 | |
| 201 | /* convert seconds to minutes, rounding up */ |
| 202 | tmrval = (t + 59) / 60; |
| 203 | |
| 204 | if (machine_is_netwinder()) { |
| 205 | /* we have a hw bug somewhere, so each 977 minute is actually only 30sec |
| 206 | * this limits the max timeout to half of device max of 255 minutes... |
| 207 | */ |
| 208 | tmrval += tmrval; |
| 209 | } |
| 210 | |
| 211 | if ((tmrval < 1) || (tmrval > 255)) |
| 212 | return -EINVAL; |
| 213 | |
| 214 | /* timeout is the timeout in seconds, timeoutM is the timeout in minutes) */ |
| 215 | timeout = t; |
| 216 | timeoutM = tmrval; |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | /* |
| 221 | * Get the watchdog status |
| 222 | */ |
| 223 | |
| 224 | static int wdt977_get_status(int *status) |
| 225 | { |
| 226 | int new_status; |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 227 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 229 | spin_lock_irqsave(&spinlock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | |
| 231 | /* unlock the SuperIO chip */ |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 232 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
| 233 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | |
| 235 | /* select device Aux2 (device=8) and read watchdog reg F4 */ |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 236 | outb_p(DEVICE_REGISTER, IO_INDEX_PORT); |
| 237 | outb_p(0x08, IO_DATA_PORT); |
| 238 | outb_p(0xF4, IO_INDEX_PORT); |
| 239 | new_status = inb_p(IO_DATA_PORT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | |
| 241 | /* lock the SuperIO chip */ |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 242 | outb_p(LOCK_DATA, IO_INDEX_PORT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 244 | spin_unlock_irqrestore(&spinlock, flags); |
| 245 | |
| 246 | *status=0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | if (new_status & 1) |
| 248 | *status |= WDIOF_CARDRESET; |
| 249 | |
| 250 | return 0; |
| 251 | } |
| 252 | |
| 253 | |
| 254 | /* |
| 255 | * /dev/watchdog handling |
| 256 | */ |
| 257 | |
| 258 | static int wdt977_open(struct inode *inode, struct file *file) |
| 259 | { |
| 260 | /* If the watchdog is alive we don't need to start it again */ |
| 261 | if( test_and_set_bit(0,&timer_alive) ) |
| 262 | return -EBUSY; |
| 263 | |
| 264 | if (nowayout) |
| 265 | __module_get(THIS_MODULE); |
| 266 | |
| 267 | wdt977_start(); |
| 268 | return nonseekable_open(inode, file); |
| 269 | } |
| 270 | |
| 271 | static int wdt977_release(struct inode *inode, struct file *file) |
| 272 | { |
| 273 | /* |
| 274 | * Shut off the timer. |
| 275 | * Lock it in if it's a module and we set nowayout |
| 276 | */ |
| 277 | if (expect_close == 42) |
| 278 | { |
| 279 | wdt977_stop(); |
| 280 | clear_bit(0,&timer_alive); |
| 281 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | wdt977_keepalive(); |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 283 | printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | } |
| 285 | expect_close = 0; |
| 286 | return 0; |
| 287 | } |
| 288 | |
| 289 | |
| 290 | /* |
| 291 | * wdt977_write: |
| 292 | * @file: file handle to the watchdog |
| 293 | * @buf: buffer to write (unused as data does not matter here |
| 294 | * @count: count of bytes |
| 295 | * @ppos: pointer to the position to write. No seeks allowed |
| 296 | * |
| 297 | * A write to a watchdog device is defined as a keepalive signal. Any |
| 298 | * write of data will do, as we we don't define content meaning. |
| 299 | */ |
| 300 | |
| 301 | static ssize_t wdt977_write(struct file *file, const char __user *buf, |
| 302 | size_t count, loff_t *ppos) |
| 303 | { |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 304 | if (count) |
| 305 | { |
| 306 | if (!nowayout) |
| 307 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | size_t i; |
| 309 | |
| 310 | /* In case it was set long ago */ |
| 311 | expect_close = 0; |
| 312 | |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 313 | for (i = 0; i != count; i++) |
| 314 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | char c; |
| 316 | if (get_user(c, buf + i)) |
| 317 | return -EFAULT; |
| 318 | if (c == 'V') |
| 319 | expect_close = 42; |
| 320 | } |
| 321 | } |
| 322 | |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 323 | /* someone wrote to us, we should restart timer */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | wdt977_keepalive(); |
| 325 | } |
| 326 | return count; |
| 327 | } |
| 328 | |
| 329 | /* |
| 330 | * wdt977_ioctl: |
| 331 | * @inode: inode of the device |
| 332 | * @file: file handle to the device |
| 333 | * @cmd: watchdog command |
| 334 | * @arg: argument pointer |
| 335 | * |
| 336 | * The watchdog API defines a common set of functions for all watchdogs |
| 337 | * according to their available features. |
| 338 | */ |
| 339 | |
| 340 | static struct watchdog_info ident = { |
| 341 | .options = WDIOF_SETTIMEOUT | |
| 342 | WDIOF_MAGICCLOSE | |
| 343 | WDIOF_KEEPALIVEPING, |
| 344 | .firmware_version = 1, |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 345 | .identity = WATCHDOG_NAME, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | }; |
| 347 | |
| 348 | static int wdt977_ioctl(struct inode *inode, struct file *file, |
| 349 | unsigned int cmd, unsigned long arg) |
| 350 | { |
| 351 | int status; |
| 352 | int new_options, retval = -EINVAL; |
| 353 | int new_timeout; |
| 354 | union { |
| 355 | struct watchdog_info __user *ident; |
| 356 | int __user *i; |
| 357 | } uarg; |
| 358 | |
| 359 | uarg.i = (int __user *)arg; |
| 360 | |
| 361 | switch(cmd) |
| 362 | { |
| 363 | default: |
Samuel Tardieu | 795b89d | 2006-09-09 17:34:31 +0200 | [diff] [blame] | 364 | return -ENOTTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | |
| 366 | case WDIOC_GETSUPPORT: |
| 367 | return copy_to_user(uarg.ident, &ident, |
| 368 | sizeof(ident)) ? -EFAULT : 0; |
| 369 | |
| 370 | case WDIOC_GETSTATUS: |
| 371 | wdt977_get_status(&status); |
| 372 | return put_user(status, uarg.i); |
| 373 | |
| 374 | case WDIOC_GETBOOTSTATUS: |
| 375 | return put_user(0, uarg.i); |
| 376 | |
| 377 | case WDIOC_KEEPALIVE: |
| 378 | wdt977_keepalive(); |
| 379 | return 0; |
| 380 | |
| 381 | case WDIOC_SETOPTIONS: |
| 382 | if (get_user (new_options, uarg.i)) |
| 383 | return -EFAULT; |
| 384 | |
| 385 | if (new_options & WDIOS_DISABLECARD) { |
| 386 | wdt977_stop(); |
| 387 | retval = 0; |
| 388 | } |
| 389 | |
| 390 | if (new_options & WDIOS_ENABLECARD) { |
| 391 | wdt977_start(); |
| 392 | retval = 0; |
| 393 | } |
| 394 | |
| 395 | return retval; |
| 396 | |
| 397 | case WDIOC_SETTIMEOUT: |
| 398 | if (get_user(new_timeout, uarg.i)) |
| 399 | return -EFAULT; |
| 400 | |
| 401 | if (wdt977_set_timeout(new_timeout)) |
| 402 | return -EINVAL; |
| 403 | |
| 404 | wdt977_keepalive(); |
| 405 | /* Fall */ |
| 406 | |
| 407 | case WDIOC_GETTIMEOUT: |
| 408 | return put_user(timeout, uarg.i); |
| 409 | |
| 410 | } |
| 411 | } |
| 412 | |
| 413 | static int wdt977_notify_sys(struct notifier_block *this, unsigned long code, |
| 414 | void *unused) |
| 415 | { |
| 416 | if(code==SYS_DOWN || code==SYS_HALT) |
| 417 | wdt977_stop(); |
| 418 | return NOTIFY_DONE; |
| 419 | } |
| 420 | |
Arjan van de Ven | 62322d2 | 2006-07-03 00:24:21 -0700 | [diff] [blame] | 421 | static const struct file_operations wdt977_fops= |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | { |
| 423 | .owner = THIS_MODULE, |
| 424 | .llseek = no_llseek, |
| 425 | .write = wdt977_write, |
| 426 | .ioctl = wdt977_ioctl, |
| 427 | .open = wdt977_open, |
| 428 | .release = wdt977_release, |
| 429 | }; |
| 430 | |
| 431 | static struct miscdevice wdt977_miscdev= |
| 432 | { |
| 433 | .minor = WATCHDOG_MINOR, |
| 434 | .name = "watchdog", |
| 435 | .fops = &wdt977_fops, |
| 436 | }; |
| 437 | |
| 438 | static struct notifier_block wdt977_notifier = { |
| 439 | .notifier_call = wdt977_notify_sys, |
| 440 | }; |
| 441 | |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 442 | static int __init wd977_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | { |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 444 | int rc; |
| 445 | |
| 446 | //if (!machine_is_netwinder()) |
| 447 | // return -ENODEV; |
| 448 | |
| 449 | printk(KERN_INFO PFX DRIVER_VERSION); |
| 450 | |
| 451 | spin_lock_init(&spinlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | |
| 453 | /* Check that the timeout value is within it's range ; if not reset to the default */ |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 454 | if (wdt977_set_timeout(timeout)) |
| 455 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | wdt977_set_timeout(DEFAULT_TIMEOUT); |
| 457 | printk(KERN_INFO PFX "timeout value must be 60<timeout<15300, using %d\n", |
| 458 | DEFAULT_TIMEOUT); |
| 459 | } |
| 460 | |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 461 | /* on Netwinder the IOports are already reserved by |
| 462 | * arch/arm/mach-footbridge/netwinder-hw.c |
| 463 | */ |
| 464 | if (!machine_is_netwinder()) |
| 465 | { |
| 466 | if (!request_region(IO_INDEX_PORT, 2, WATCHDOG_NAME)) |
| 467 | { |
| 468 | printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", |
| 469 | IO_INDEX_PORT); |
| 470 | rc = -EIO; |
| 471 | goto err_out; |
| 472 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | } |
| 474 | |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 475 | rc = misc_register(&wdt977_miscdev); |
| 476 | if (rc) |
| 477 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 479 | wdt977_miscdev.minor, rc); |
| 480 | goto err_out_region; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | } |
| 482 | |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 483 | rc = register_reboot_notifier(&wdt977_notifier); |
| 484 | if (rc) |
| 485 | { |
| 486 | printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", |
| 487 | rc); |
| 488 | goto err_out_miscdev; |
| 489 | } |
| 490 | |
| 491 | printk(KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d, testmode=%i)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | timeout, nowayout, testmode); |
| 493 | |
| 494 | return 0; |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 495 | |
| 496 | err_out_miscdev: |
| 497 | misc_deregister(&wdt977_miscdev); |
| 498 | err_out_region: |
| 499 | if (!machine_is_netwinder()) |
| 500 | release_region(IO_INDEX_PORT,2); |
| 501 | err_out: |
| 502 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | } |
| 504 | |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 505 | static void __exit wd977_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | { |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 507 | wdt977_stop(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | misc_deregister(&wdt977_miscdev); |
| 509 | unregister_reboot_notifier(&wdt977_notifier); |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 510 | release_region(IO_INDEX_PORT,2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | } |
| 512 | |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 513 | module_init(wd977_init); |
| 514 | module_exit(wd977_exit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | |
Woody Suwalski | 4dab06f | 2006-01-08 01:00:31 -0800 | [diff] [blame] | 516 | MODULE_AUTHOR("Woody Suwalski <woodys@xandros.com>"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | MODULE_DESCRIPTION("W83977AF Watchdog driver"); |
| 518 | MODULE_LICENSE("GPL"); |
| 519 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |