Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 1 | /* |
| 2 | * W83977F Watchdog Timer Driver for Winbond W83977F I/O Chip |
| 3 | * |
| 4 | * (c) Copyright 2005 Jose Goncalves <jose.goncalves@inov.pt> |
| 5 | * |
| 6 | * Based on w83877f_wdt.c by Scott Jennings, |
| 7 | * and wdt977.c by Woody Suwalski |
| 8 | * |
| 9 | * ----------------------- |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU General Public License |
| 13 | * as published by the Free Software Foundation; either version |
| 14 | * 2 of the License, or (at your option) any later version. |
| 15 | * |
| 16 | */ |
| 17 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 19 | |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 20 | #include <linux/module.h> |
| 21 | #include <linux/moduleparam.h> |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 22 | #include <linux/types.h> |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/fs.h> |
| 25 | #include <linux/miscdevice.h> |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/ioport.h> |
| 28 | #include <linux/watchdog.h> |
| 29 | #include <linux/notifier.h> |
| 30 | #include <linux/reboot.h> |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 31 | #include <linux/uaccess.h> |
| 32 | #include <linux/io.h> |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 33 | |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 34 | |
| 35 | #define WATCHDOG_VERSION "1.00" |
| 36 | #define WATCHDOG_NAME "W83977F WDT" |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 37 | |
| 38 | #define IO_INDEX_PORT 0x3F0 |
| 39 | #define IO_DATA_PORT (IO_INDEX_PORT+1) |
| 40 | |
| 41 | #define UNLOCK_DATA 0x87 |
| 42 | #define LOCK_DATA 0xAA |
| 43 | #define DEVICE_REGISTER 0x07 |
| 44 | |
| 45 | #define DEFAULT_TIMEOUT 45 /* default timeout in seconds */ |
| 46 | |
| 47 | static int timeout = DEFAULT_TIMEOUT; |
| 48 | static int timeoutW; /* timeout in watchdog counter units */ |
| 49 | static unsigned long timer_alive; |
| 50 | static int testmode; |
| 51 | static char expect_close; |
Alexey Dobriyan | c7dfd0c | 2007-11-01 16:27:08 -0700 | [diff] [blame] | 52 | static DEFINE_SPINLOCK(spinlock); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 53 | |
| 54 | module_param(timeout, int, 0); |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 55 | MODULE_PARM_DESC(timeout, |
| 56 | "Watchdog timeout in seconds (15..7635), default=" |
| 57 | __MODULE_STRING(DEFAULT_TIMEOUT) ")"); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 58 | module_param(testmode, int, 0); |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 59 | MODULE_PARM_DESC(testmode, "Watchdog testmode (1 = no reboot), default=0"); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 60 | |
Wim Van Sebroeck | 86a1e18 | 2012-03-05 16:51:11 +0100 | [diff] [blame] | 61 | static bool nowayout = WATCHDOG_NOWAYOUT; |
| 62 | module_param(nowayout, bool, 0); |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 63 | MODULE_PARM_DESC(nowayout, |
| 64 | "Watchdog cannot be stopped once started (default=" |
| 65 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 66 | |
| 67 | /* |
| 68 | * Start the watchdog |
| 69 | */ |
| 70 | |
| 71 | static int wdt_start(void) |
| 72 | { |
| 73 | unsigned long flags; |
| 74 | |
| 75 | spin_lock_irqsave(&spinlock, flags); |
| 76 | |
| 77 | /* Unlock the SuperIO chip */ |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 78 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
| 79 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 80 | |
| 81 | /* |
| 82 | * Select device Aux2 (device=8) to set watchdog regs F2, F3 and F4. |
| 83 | * F2 has the timeout in watchdog counter units. |
| 84 | * F3 is set to enable watchdog LED blink at timeout. |
| 85 | * F4 is used to just clear the TIMEOUT'ed state (bit 0). |
| 86 | */ |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 87 | outb_p(DEVICE_REGISTER, IO_INDEX_PORT); |
| 88 | outb_p(0x08, IO_DATA_PORT); |
| 89 | outb_p(0xF2, IO_INDEX_PORT); |
| 90 | outb_p(timeoutW, IO_DATA_PORT); |
| 91 | outb_p(0xF3, IO_INDEX_PORT); |
| 92 | outb_p(0x08, IO_DATA_PORT); |
| 93 | outb_p(0xF4, IO_INDEX_PORT); |
| 94 | outb_p(0x00, IO_DATA_PORT); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 95 | |
| 96 | /* Set device Aux2 active */ |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 97 | outb_p(0x30, IO_INDEX_PORT); |
| 98 | outb_p(0x01, IO_DATA_PORT); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 99 | |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 100 | /* |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 101 | * Select device Aux1 (dev=7) to set GP16 as the watchdog output |
| 102 | * (in reg E6) and GP13 as the watchdog LED output (in reg E3). |
| 103 | * Map GP16 at pin 119. |
| 104 | * In test mode watch the bit 0 on F4 to indicate "triggered" or |
| 105 | * check watchdog LED on SBC. |
| 106 | */ |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 107 | outb_p(DEVICE_REGISTER, IO_INDEX_PORT); |
| 108 | outb_p(0x07, IO_DATA_PORT); |
| 109 | if (!testmode) { |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 110 | unsigned pin_map; |
| 111 | |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 112 | outb_p(0xE6, IO_INDEX_PORT); |
| 113 | outb_p(0x0A, IO_DATA_PORT); |
| 114 | outb_p(0x2C, IO_INDEX_PORT); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 115 | pin_map = inb_p(IO_DATA_PORT); |
| 116 | pin_map |= 0x10; |
| 117 | pin_map &= ~(0x20); |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 118 | outb_p(0x2C, IO_INDEX_PORT); |
| 119 | outb_p(pin_map, IO_DATA_PORT); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 120 | } |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 121 | outb_p(0xE3, IO_INDEX_PORT); |
| 122 | outb_p(0x08, IO_DATA_PORT); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 123 | |
| 124 | /* Set device Aux1 active */ |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 125 | outb_p(0x30, IO_INDEX_PORT); |
| 126 | outb_p(0x01, IO_DATA_PORT); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 127 | |
| 128 | /* Lock the SuperIO chip */ |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 129 | outb_p(LOCK_DATA, IO_INDEX_PORT); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 130 | |
| 131 | spin_unlock_irqrestore(&spinlock, flags); |
| 132 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 133 | pr_info("activated\n"); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 134 | |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | /* |
| 139 | * Stop the watchdog |
| 140 | */ |
| 141 | |
| 142 | static int wdt_stop(void) |
| 143 | { |
| 144 | unsigned long flags; |
| 145 | |
| 146 | spin_lock_irqsave(&spinlock, flags); |
| 147 | |
| 148 | /* Unlock the SuperIO chip */ |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 149 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
| 150 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 151 | |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 152 | /* |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 153 | * Select device Aux2 (device=8) to set watchdog regs F2, F3 and F4. |
| 154 | * F2 is reset to its default value (watchdog timer disabled). |
| 155 | * F3 is reset to its default state. |
| 156 | * F4 clears the TIMEOUT'ed state (bit 0) - back to default. |
| 157 | */ |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 158 | outb_p(DEVICE_REGISTER, IO_INDEX_PORT); |
| 159 | outb_p(0x08, IO_DATA_PORT); |
| 160 | outb_p(0xF2, IO_INDEX_PORT); |
| 161 | outb_p(0xFF, IO_DATA_PORT); |
| 162 | outb_p(0xF3, IO_INDEX_PORT); |
| 163 | outb_p(0x00, IO_DATA_PORT); |
| 164 | outb_p(0xF4, IO_INDEX_PORT); |
| 165 | outb_p(0x00, IO_DATA_PORT); |
| 166 | outb_p(0xF2, IO_INDEX_PORT); |
| 167 | outb_p(0x00, IO_DATA_PORT); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 168 | |
| 169 | /* |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 170 | * Select device Aux1 (dev=7) to set GP16 (in reg E6) and |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 171 | * Gp13 (in reg E3) as inputs. |
| 172 | */ |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 173 | outb_p(DEVICE_REGISTER, IO_INDEX_PORT); |
| 174 | outb_p(0x07, IO_DATA_PORT); |
| 175 | if (!testmode) { |
| 176 | outb_p(0xE6, IO_INDEX_PORT); |
| 177 | outb_p(0x01, IO_DATA_PORT); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 178 | } |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 179 | outb_p(0xE3, IO_INDEX_PORT); |
| 180 | outb_p(0x01, IO_DATA_PORT); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 181 | |
| 182 | /* Lock the SuperIO chip */ |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 183 | outb_p(LOCK_DATA, IO_INDEX_PORT); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 184 | |
| 185 | spin_unlock_irqrestore(&spinlock, flags); |
| 186 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 187 | pr_info("shutdown\n"); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 188 | |
| 189 | return 0; |
| 190 | } |
| 191 | |
| 192 | /* |
| 193 | * Send a keepalive ping to the watchdog |
| 194 | * This is done by simply re-writing the timeout to reg. 0xF2 |
| 195 | */ |
| 196 | |
| 197 | static int wdt_keepalive(void) |
| 198 | { |
| 199 | unsigned long flags; |
| 200 | |
| 201 | spin_lock_irqsave(&spinlock, flags); |
| 202 | |
| 203 | /* Unlock the SuperIO chip */ |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 204 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
| 205 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 206 | |
| 207 | /* Select device Aux2 (device=8) to kick watchdog reg F2 */ |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 208 | outb_p(DEVICE_REGISTER, IO_INDEX_PORT); |
| 209 | outb_p(0x08, IO_DATA_PORT); |
| 210 | outb_p(0xF2, IO_INDEX_PORT); |
| 211 | outb_p(timeoutW, IO_DATA_PORT); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 212 | |
| 213 | /* Lock the SuperIO chip */ |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 214 | outb_p(LOCK_DATA, IO_INDEX_PORT); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 215 | |
| 216 | spin_unlock_irqrestore(&spinlock, flags); |
| 217 | |
| 218 | return 0; |
| 219 | } |
| 220 | |
| 221 | /* |
| 222 | * Set the watchdog timeout value |
| 223 | */ |
| 224 | |
| 225 | static int wdt_set_timeout(int t) |
| 226 | { |
| 227 | int tmrval; |
| 228 | |
| 229 | /* |
| 230 | * Convert seconds to watchdog counter time units, rounding up. |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 231 | * On PCM-5335 watchdog units are 30 seconds/step with 15 sec startup |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 232 | * value. This information is supplied in the PCM-5335 manual and was |
| 233 | * checked by me on a real board. This is a bit strange because W83977f |
| 234 | * datasheet says counter unit is in minutes! |
| 235 | */ |
| 236 | if (t < 15) |
| 237 | return -EINVAL; |
| 238 | |
| 239 | tmrval = ((t + 15) + 29) / 30; |
| 240 | |
| 241 | if (tmrval > 255) |
| 242 | return -EINVAL; |
| 243 | |
| 244 | /* |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 245 | * timeout is the timeout in seconds, |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 246 | * timeoutW is the timeout in watchdog counter units. |
| 247 | */ |
| 248 | timeoutW = tmrval; |
| 249 | timeout = (timeoutW * 30) - 15; |
| 250 | return 0; |
| 251 | } |
| 252 | |
| 253 | /* |
| 254 | * Get the watchdog status |
| 255 | */ |
| 256 | |
| 257 | static int wdt_get_status(int *status) |
| 258 | { |
| 259 | int new_status; |
| 260 | unsigned long flags; |
| 261 | |
| 262 | spin_lock_irqsave(&spinlock, flags); |
| 263 | |
| 264 | /* Unlock the SuperIO chip */ |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 265 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
| 266 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 267 | |
| 268 | /* Select device Aux2 (device=8) to read watchdog reg F4 */ |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 269 | outb_p(DEVICE_REGISTER, IO_INDEX_PORT); |
| 270 | outb_p(0x08, IO_DATA_PORT); |
| 271 | outb_p(0xF4, IO_INDEX_PORT); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 272 | new_status = inb_p(IO_DATA_PORT); |
| 273 | |
| 274 | /* Lock the SuperIO chip */ |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 275 | outb_p(LOCK_DATA, IO_INDEX_PORT); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 276 | |
| 277 | spin_unlock_irqrestore(&spinlock, flags); |
| 278 | |
| 279 | *status = 0; |
| 280 | if (new_status & 1) |
| 281 | *status |= WDIOF_CARDRESET; |
| 282 | |
| 283 | return 0; |
| 284 | } |
| 285 | |
| 286 | |
| 287 | /* |
| 288 | * /dev/watchdog handling |
| 289 | */ |
| 290 | |
| 291 | static int wdt_open(struct inode *inode, struct file *file) |
| 292 | { |
| 293 | /* If the watchdog is alive we don't need to start it again */ |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 294 | if (test_and_set_bit(0, &timer_alive)) |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 295 | return -EBUSY; |
| 296 | |
| 297 | if (nowayout) |
| 298 | __module_get(THIS_MODULE); |
| 299 | |
| 300 | wdt_start(); |
| 301 | return nonseekable_open(inode, file); |
| 302 | } |
| 303 | |
| 304 | static int wdt_release(struct inode *inode, struct file *file) |
| 305 | { |
| 306 | /* |
| 307 | * Shut off the timer. |
| 308 | * Lock it in if it's a module and we set nowayout |
| 309 | */ |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 310 | if (expect_close == 42) { |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 311 | wdt_stop(); |
| 312 | clear_bit(0, &timer_alive); |
| 313 | } else { |
| 314 | wdt_keepalive(); |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 315 | pr_crit("unexpected close, not stopping watchdog!\n"); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 316 | } |
| 317 | expect_close = 0; |
| 318 | return 0; |
| 319 | } |
| 320 | |
| 321 | /* |
| 322 | * wdt_write: |
| 323 | * @file: file handle to the watchdog |
| 324 | * @buf: buffer to write (unused as data does not matter here |
| 325 | * @count: count of bytes |
| 326 | * @ppos: pointer to the position to write. No seeks allowed |
| 327 | * |
| 328 | * A write to a watchdog device is defined as a keepalive signal. Any |
| 329 | * write of data will do, as we we don't define content meaning. |
| 330 | */ |
| 331 | |
| 332 | static ssize_t wdt_write(struct file *file, const char __user *buf, |
| 333 | size_t count, loff_t *ppos) |
| 334 | { |
| 335 | /* See if we got the magic character 'V' and reload the timer */ |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 336 | if (count) { |
| 337 | if (!nowayout) { |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 338 | size_t ofs; |
| 339 | |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 340 | /* note: just in case someone wrote the |
| 341 | magic character long ago */ |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 342 | expect_close = 0; |
| 343 | |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 344 | /* scan to see whether or not we got the |
| 345 | magic character */ |
| 346 | for (ofs = 0; ofs != count; ofs++) { |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 347 | char c; |
| 348 | if (get_user(c, buf + ofs)) |
| 349 | return -EFAULT; |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 350 | if (c == 'V') |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 351 | expect_close = 42; |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 352 | } |
| 353 | } |
| 354 | |
| 355 | /* someone wrote to us, we should restart timer */ |
| 356 | wdt_keepalive(); |
| 357 | } |
| 358 | return count; |
| 359 | } |
| 360 | |
| 361 | /* |
| 362 | * wdt_ioctl: |
| 363 | * @inode: inode of the device |
| 364 | * @file: file handle to the device |
| 365 | * @cmd: watchdog command |
| 366 | * @arg: argument pointer |
| 367 | * |
| 368 | * The watchdog API defines a common set of functions for all watchdogs |
| 369 | * according to their available features. |
| 370 | */ |
| 371 | |
Wim Van Sebroeck | 42747d7 | 2009-12-26 18:55:22 +0000 | [diff] [blame] | 372 | static const struct watchdog_info ident = { |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 373 | .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, |
| 374 | .firmware_version = 1, |
| 375 | .identity = WATCHDOG_NAME, |
| 376 | }; |
| 377 | |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 378 | static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 379 | { |
| 380 | int status; |
| 381 | int new_options, retval = -EINVAL; |
| 382 | int new_timeout; |
| 383 | union { |
| 384 | struct watchdog_info __user *ident; |
| 385 | int __user *i; |
| 386 | } uarg; |
| 387 | |
| 388 | uarg.i = (int __user *)arg; |
| 389 | |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 390 | switch (cmd) { |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 391 | case WDIOC_GETSUPPORT: |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 392 | return copy_to_user(uarg.ident, &ident, |
| 393 | sizeof(ident)) ? -EFAULT : 0; |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 394 | |
| 395 | case WDIOC_GETSTATUS: |
| 396 | wdt_get_status(&status); |
| 397 | return put_user(status, uarg.i); |
| 398 | |
| 399 | case WDIOC_GETBOOTSTATUS: |
| 400 | return put_user(0, uarg.i); |
| 401 | |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 402 | case WDIOC_SETOPTIONS: |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 403 | if (get_user(new_options, uarg.i)) |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 404 | return -EFAULT; |
| 405 | |
| 406 | if (new_options & WDIOS_DISABLECARD) { |
| 407 | wdt_stop(); |
| 408 | retval = 0; |
| 409 | } |
| 410 | |
| 411 | if (new_options & WDIOS_ENABLECARD) { |
| 412 | wdt_start(); |
| 413 | retval = 0; |
| 414 | } |
| 415 | |
| 416 | return retval; |
| 417 | |
Wim Van Sebroeck | 0c06090c | 2008-07-18 11:41:17 +0000 | [diff] [blame] | 418 | case WDIOC_KEEPALIVE: |
| 419 | wdt_keepalive(); |
| 420 | return 0; |
| 421 | |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 422 | case WDIOC_SETTIMEOUT: |
| 423 | if (get_user(new_timeout, uarg.i)) |
| 424 | return -EFAULT; |
| 425 | |
| 426 | if (wdt_set_timeout(new_timeout)) |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 427 | return -EINVAL; |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 428 | |
| 429 | wdt_keepalive(); |
| 430 | /* Fall */ |
| 431 | |
| 432 | case WDIOC_GETTIMEOUT: |
| 433 | return put_user(timeout, uarg.i); |
| 434 | |
Wim Van Sebroeck | 0c06090c | 2008-07-18 11:41:17 +0000 | [diff] [blame] | 435 | default: |
| 436 | return -ENOTTY; |
| 437 | |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 438 | } |
| 439 | } |
| 440 | |
| 441 | static int wdt_notify_sys(struct notifier_block *this, unsigned long code, |
| 442 | void *unused) |
| 443 | { |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 444 | if (code == SYS_DOWN || code == SYS_HALT) |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 445 | wdt_stop(); |
| 446 | return NOTIFY_DONE; |
| 447 | } |
| 448 | |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 449 | static const struct file_operations wdt_fops = { |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 450 | .owner = THIS_MODULE, |
| 451 | .llseek = no_llseek, |
| 452 | .write = wdt_write, |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 453 | .unlocked_ioctl = wdt_ioctl, |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 454 | .open = wdt_open, |
| 455 | .release = wdt_release, |
| 456 | }; |
| 457 | |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 458 | static struct miscdevice wdt_miscdev = { |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 459 | .minor = WATCHDOG_MINOR, |
| 460 | .name = "watchdog", |
| 461 | .fops = &wdt_fops, |
| 462 | }; |
| 463 | |
| 464 | static struct notifier_block wdt_notifier = { |
| 465 | .notifier_call = wdt_notify_sys, |
| 466 | }; |
| 467 | |
| 468 | static int __init w83977f_wdt_init(void) |
| 469 | { |
| 470 | int rc; |
| 471 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 472 | pr_info("driver v%s\n", WATCHDOG_VERSION); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 473 | |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 474 | /* |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 475 | * Check that the timeout value is within it's range; |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 476 | * if not reset to the default |
| 477 | */ |
| 478 | if (wdt_set_timeout(timeout)) { |
| 479 | wdt_set_timeout(DEFAULT_TIMEOUT); |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 480 | pr_info("timeout value must be 15 <= timeout <= 7635, using %d\n", |
| 481 | DEFAULT_TIMEOUT); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 482 | } |
| 483 | |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 484 | if (!request_region(IO_INDEX_PORT, 2, WATCHDOG_NAME)) { |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 485 | pr_err("I/O address 0x%04x already in use\n", IO_INDEX_PORT); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 486 | rc = -EIO; |
| 487 | goto err_out; |
| 488 | } |
| 489 | |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 490 | rc = register_reboot_notifier(&wdt_notifier); |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 491 | if (rc) { |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 492 | pr_err("cannot register reboot notifier (err=%d)\n", rc); |
Wim Van Sebroeck | c6cb13a | 2007-12-26 20:32:51 +0000 | [diff] [blame] | 493 | goto err_out_region; |
| 494 | } |
| 495 | |
| 496 | rc = misc_register(&wdt_miscdev); |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 497 | if (rc) { |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 498 | pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
| 499 | wdt_miscdev.minor, rc); |
Wim Van Sebroeck | c6cb13a | 2007-12-26 20:32:51 +0000 | [diff] [blame] | 500 | goto err_out_reboot; |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 501 | } |
| 502 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 503 | pr_info("initialized. timeout=%d sec (nowayout=%d testmode=%d)\n", |
| 504 | timeout, nowayout, testmode); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 505 | |
| 506 | return 0; |
| 507 | |
Wim Van Sebroeck | c6cb13a | 2007-12-26 20:32:51 +0000 | [diff] [blame] | 508 | err_out_reboot: |
| 509 | unregister_reboot_notifier(&wdt_notifier); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 510 | err_out_region: |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 511 | release_region(IO_INDEX_PORT, 2); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 512 | err_out: |
| 513 | return rc; |
| 514 | } |
| 515 | |
| 516 | static void __exit w83977f_wdt_exit(void) |
| 517 | { |
| 518 | wdt_stop(); |
| 519 | misc_deregister(&wdt_miscdev); |
| 520 | unregister_reboot_notifier(&wdt_notifier); |
Alan Cox | 84af401 | 2008-05-19 14:09:34 +0100 | [diff] [blame] | 521 | release_region(IO_INDEX_PORT, 2); |
Jose Miguel Goncalves | b4cc4aa | 2005-09-06 17:05:30 -0700 | [diff] [blame] | 522 | } |
| 523 | |
| 524 | module_init(w83977f_wdt_init); |
| 525 | module_exit(w83977f_wdt_exit); |
| 526 | |
| 527 | MODULE_AUTHOR("Jose Goncalves <jose.goncalves@inov.pt>"); |
| 528 | MODULE_DESCRIPTION("Driver for watchdog timer in W83977F I/O chip"); |
| 529 | MODULE_LICENSE("GPL"); |
| 530 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |