Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Watchdog Timer Driver |
| 3 | * for ITE IT87xx Environment Control - Low Pin Count Input / Output |
| 4 | * |
| 5 | * (c) Copyright 2007 Oliver Schuster <olivers137@aol.com> |
| 6 | * |
| 7 | * Based on softdog.c by Alan Cox, |
| 8 | * 83977f_wdt.c by Jose Goncalves, |
| 9 | * it87.c by Chris Gauthron, Jean Delvare |
| 10 | * |
| 11 | * Data-sheets: Publicly available at the ITE website |
| 12 | * http://www.ite.com.tw/ |
| 13 | * |
| 14 | * Support of the watchdog timers, which are available on |
Huaro Tomita | 4bc3027 | 2011-01-21 07:37:51 +0900 | [diff] [blame] | 15 | * IT8702, IT8712, IT8716, IT8718, IT8720, IT8721 and IT8726. |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 16 | * |
| 17 | * This program is free software; you can redistribute it and/or |
| 18 | * modify it under the terms of the GNU General Public License |
| 19 | * as published by the Free Software Foundation; either version |
| 20 | * 2 of the License, or (at your option) any later version. |
| 21 | * |
| 22 | * This program is distributed in the hope that it will be useful, |
| 23 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 25 | * GNU General Public License for more details. |
| 26 | * |
| 27 | * You should have received a copy of the GNU General Public License |
| 28 | * along with this program; if not, write to the Free Software |
| 29 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 30 | */ |
| 31 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame^] | 32 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 33 | |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 34 | #include <linux/module.h> |
| 35 | #include <linux/moduleparam.h> |
| 36 | #include <linux/types.h> |
| 37 | #include <linux/kernel.h> |
| 38 | #include <linux/fs.h> |
| 39 | #include <linux/miscdevice.h> |
| 40 | #include <linux/init.h> |
| 41 | #include <linux/ioport.h> |
| 42 | #include <linux/watchdog.h> |
| 43 | #include <linux/notifier.h> |
| 44 | #include <linux/reboot.h> |
| 45 | #include <linux/uaccess.h> |
| 46 | #include <linux/io.h> |
| 47 | |
| 48 | #include <asm/system.h> |
| 49 | |
Huaro Tomita | 4bc3027 | 2011-01-21 07:37:51 +0900 | [diff] [blame] | 50 | #define WATCHDOG_VERSION "1.14" |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 51 | #define WATCHDOG_NAME "IT87 WDT" |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 52 | #define DRIVER_VERSION WATCHDOG_NAME " driver, v" WATCHDOG_VERSION "\n" |
| 53 | #define WD_MAGIC 'V' |
| 54 | |
| 55 | /* Defaults for Module Parameter */ |
| 56 | #define DEFAULT_NOGAMEPORT 0 |
| 57 | #define DEFAULT_EXCLUSIVE 1 |
Wim Van Sebroeck | 5f3b275 | 2011-02-23 20:04:38 +0000 | [diff] [blame] | 58 | #define DEFAULT_TIMEOUT 60 |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 59 | #define DEFAULT_TESTMODE 0 |
| 60 | #define DEFAULT_NOWAYOUT WATCHDOG_NOWAYOUT |
| 61 | |
| 62 | /* IO Ports */ |
| 63 | #define REG 0x2e |
| 64 | #define VAL 0x2f |
| 65 | |
| 66 | /* Logical device Numbers LDN */ |
| 67 | #define GPIO 0x07 |
| 68 | #define GAMEPORT 0x09 |
| 69 | #define CIR 0x0a |
| 70 | |
| 71 | /* Configuration Registers and Functions */ |
| 72 | #define LDNREG 0x07 |
| 73 | #define CHIPID 0x20 |
Wim Van Sebroeck | 5f3b275 | 2011-02-23 20:04:38 +0000 | [diff] [blame] | 74 | #define CHIPREV 0x22 |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 75 | #define ACTREG 0x30 |
Wim Van Sebroeck | 5f3b275 | 2011-02-23 20:04:38 +0000 | [diff] [blame] | 76 | #define BASEREG 0x60 |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 77 | |
| 78 | /* Chip Id numbers */ |
| 79 | #define NO_DEV_ID 0xffff |
Ondrej Zajicek | dfb0b8e | 2010-09-14 02:54:16 +0200 | [diff] [blame] | 80 | #define IT8702_ID 0x8702 |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 81 | #define IT8705_ID 0x8705 |
| 82 | #define IT8712_ID 0x8712 |
| 83 | #define IT8716_ID 0x8716 |
| 84 | #define IT8718_ID 0x8718 |
Ondrej Zajicek | ee3e965 | 2010-09-14 02:47:28 +0200 | [diff] [blame] | 85 | #define IT8720_ID 0x8720 |
Huaro Tomita | 4bc3027 | 2011-01-21 07:37:51 +0900 | [diff] [blame] | 86 | #define IT8721_ID 0x8721 |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 87 | #define IT8726_ID 0x8726 /* the data sheet suggest wrongly 0x8716 */ |
| 88 | |
| 89 | /* GPIO Configuration Registers LDN=0x07 */ |
Wim Van Sebroeck | 5f3b275 | 2011-02-23 20:04:38 +0000 | [diff] [blame] | 90 | #define WDTCTRL 0x71 |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 91 | #define WDTCFG 0x72 |
| 92 | #define WDTVALLSB 0x73 |
| 93 | #define WDTVALMSB 0x74 |
| 94 | |
| 95 | /* GPIO Bits WDTCTRL */ |
| 96 | #define WDT_CIRINT 0x80 |
| 97 | #define WDT_MOUSEINT 0x40 |
| 98 | #define WDT_KYBINT 0x20 |
Huaro Tomita | 4bc3027 | 2011-01-21 07:37:51 +0900 | [diff] [blame] | 99 | #define WDT_GAMEPORT 0x10 /* not in it8718, it8720, it8721 */ |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 100 | #define WDT_FORCE 0x02 |
| 101 | #define WDT_ZERO 0x01 |
| 102 | |
| 103 | /* GPIO Bits WDTCFG */ |
| 104 | #define WDT_TOV1 0x80 |
| 105 | #define WDT_KRST 0x40 |
| 106 | #define WDT_TOVE 0x20 |
Huaro Tomita | 4bc3027 | 2011-01-21 07:37:51 +0900 | [diff] [blame] | 107 | #define WDT_PWROK 0x10 /* not in it8721 */ |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 108 | #define WDT_INT_MASK 0x0f |
| 109 | |
| 110 | /* CIR Configuration Register LDN=0x0a */ |
Wim Van Sebroeck | 5f3b275 | 2011-02-23 20:04:38 +0000 | [diff] [blame] | 111 | #define CIR_ILS 0x70 |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 112 | |
| 113 | /* The default Base address is not always available, we use this */ |
| 114 | #define CIR_BASE 0x0208 |
| 115 | |
| 116 | /* CIR Controller */ |
| 117 | #define CIR_DR(b) (b) |
| 118 | #define CIR_IER(b) (b + 1) |
| 119 | #define CIR_RCR(b) (b + 2) |
| 120 | #define CIR_TCR1(b) (b + 3) |
| 121 | #define CIR_TCR2(b) (b + 4) |
| 122 | #define CIR_TSR(b) (b + 5) |
| 123 | #define CIR_RSR(b) (b + 6) |
| 124 | #define CIR_BDLR(b) (b + 5) |
| 125 | #define CIR_BDHR(b) (b + 6) |
| 126 | #define CIR_IIR(b) (b + 7) |
| 127 | |
| 128 | /* Default Base address of Game port */ |
| 129 | #define GP_BASE_DEFAULT 0x0201 |
| 130 | |
| 131 | /* wdt_status */ |
| 132 | #define WDTS_TIMER_RUN 0 |
| 133 | #define WDTS_DEV_OPEN 1 |
| 134 | #define WDTS_KEEPALIVE 2 |
| 135 | #define WDTS_LOCKED 3 |
| 136 | #define WDTS_USE_GP 4 |
| 137 | #define WDTS_EXPECTED 5 |
| 138 | |
Huaro Tomita | 4bc3027 | 2011-01-21 07:37:51 +0900 | [diff] [blame] | 139 | static unsigned int base, gpact, ciract, max_units, chip_type; |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 140 | static unsigned long wdt_status; |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 141 | |
| 142 | static int nogameport = DEFAULT_NOGAMEPORT; |
| 143 | static int exclusive = DEFAULT_EXCLUSIVE; |
| 144 | static int timeout = DEFAULT_TIMEOUT; |
| 145 | static int testmode = DEFAULT_TESTMODE; |
| 146 | static int nowayout = DEFAULT_NOWAYOUT; |
| 147 | |
| 148 | module_param(nogameport, int, 0); |
| 149 | MODULE_PARM_DESC(nogameport, "Forbid the activation of game port, default=" |
| 150 | __MODULE_STRING(DEFAULT_NOGAMEPORT)); |
| 151 | module_param(exclusive, int, 0); |
| 152 | MODULE_PARM_DESC(exclusive, "Watchdog exclusive device open, default=" |
| 153 | __MODULE_STRING(DEFAULT_EXCLUSIVE)); |
| 154 | module_param(timeout, int, 0); |
| 155 | MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds, default=" |
| 156 | __MODULE_STRING(DEFAULT_TIMEOUT)); |
| 157 | module_param(testmode, int, 0); |
| 158 | MODULE_PARM_DESC(testmode, "Watchdog test mode (1 = no reboot), default=" |
| 159 | __MODULE_STRING(DEFAULT_TESTMODE)); |
| 160 | module_param(nowayout, int, 0); |
| 161 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started, default=" |
| 162 | __MODULE_STRING(WATCHDOG_NOWAYOUT)); |
| 163 | |
| 164 | /* Superio Chip */ |
| 165 | |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 166 | static inline int superio_enter(void) |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 167 | { |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 168 | /* |
| 169 | * Try to reserve REG and REG + 1 for exclusive access. |
| 170 | */ |
| 171 | if (!request_muxed_region(REG, 2, WATCHDOG_NAME)) |
| 172 | return -EBUSY; |
| 173 | |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 174 | outb(0x87, REG); |
| 175 | outb(0x01, REG); |
| 176 | outb(0x55, REG); |
| 177 | outb(0x55, REG); |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 178 | return 0; |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 179 | } |
| 180 | |
| 181 | static inline void superio_exit(void) |
| 182 | { |
| 183 | outb(0x02, REG); |
| 184 | outb(0x02, VAL); |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 185 | release_region(REG, 2); |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 186 | } |
| 187 | |
| 188 | static inline void superio_select(int ldn) |
| 189 | { |
| 190 | outb(LDNREG, REG); |
| 191 | outb(ldn, VAL); |
| 192 | } |
| 193 | |
| 194 | static inline int superio_inb(int reg) |
| 195 | { |
| 196 | outb(reg, REG); |
| 197 | return inb(VAL); |
| 198 | } |
| 199 | |
| 200 | static inline void superio_outb(int val, int reg) |
| 201 | { |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 202 | outb(reg, REG); |
| 203 | outb(val, VAL); |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 204 | } |
| 205 | |
| 206 | static inline int superio_inw(int reg) |
| 207 | { |
| 208 | int val; |
| 209 | outb(reg++, REG); |
| 210 | val = inb(VAL) << 8; |
| 211 | outb(reg, REG); |
| 212 | val |= inb(VAL); |
| 213 | return val; |
| 214 | } |
| 215 | |
| 216 | static inline void superio_outw(int val, int reg) |
| 217 | { |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 218 | outb(reg++, REG); |
| 219 | outb(val >> 8, VAL); |
| 220 | outb(reg, REG); |
| 221 | outb(val, VAL); |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 222 | } |
| 223 | |
Ondrej Zajicek | dfb0b8e | 2010-09-14 02:54:16 +0200 | [diff] [blame] | 224 | /* Internal function, should be called after superio_select(GPIO) */ |
| 225 | static void wdt_update_timeout(void) |
| 226 | { |
Huaro Tomita | 4bc3027 | 2011-01-21 07:37:51 +0900 | [diff] [blame] | 227 | unsigned char cfg = WDT_KRST; |
Ondrej Zajicek | dfb0b8e | 2010-09-14 02:54:16 +0200 | [diff] [blame] | 228 | int tm = timeout; |
| 229 | |
| 230 | if (testmode) |
| 231 | cfg = 0; |
| 232 | |
| 233 | if (tm <= max_units) |
| 234 | cfg |= WDT_TOV1; |
| 235 | else |
| 236 | tm /= 60; |
| 237 | |
Huaro Tomita | 4bc3027 | 2011-01-21 07:37:51 +0900 | [diff] [blame] | 238 | if (chip_type != IT8721_ID) |
| 239 | cfg |= WDT_PWROK; |
| 240 | |
Ondrej Zajicek | dfb0b8e | 2010-09-14 02:54:16 +0200 | [diff] [blame] | 241 | superio_outb(cfg, WDTCFG); |
| 242 | superio_outb(tm, WDTVALLSB); |
| 243 | if (max_units > 255) |
| 244 | superio_outb(tm>>8, WDTVALMSB); |
| 245 | } |
| 246 | |
| 247 | static int wdt_round_time(int t) |
| 248 | { |
| 249 | t += 59; |
| 250 | t -= t % 60; |
| 251 | return t; |
| 252 | } |
| 253 | |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 254 | /* watchdog timer handling */ |
| 255 | |
| 256 | static void wdt_keepalive(void) |
| 257 | { |
| 258 | if (test_bit(WDTS_USE_GP, &wdt_status)) |
| 259 | inb(base); |
| 260 | else |
| 261 | /* The timer reloads with around 5 msec delay */ |
| 262 | outb(0x55, CIR_DR(base)); |
| 263 | set_bit(WDTS_KEEPALIVE, &wdt_status); |
| 264 | } |
| 265 | |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 266 | static int wdt_start(void) |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 267 | { |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 268 | int ret = superio_enter(); |
| 269 | if (ret) |
| 270 | return ret; |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 271 | |
| 272 | superio_select(GPIO); |
| 273 | if (test_bit(WDTS_USE_GP, &wdt_status)) |
| 274 | superio_outb(WDT_GAMEPORT, WDTCTRL); |
| 275 | else |
| 276 | superio_outb(WDT_CIRINT, WDTCTRL); |
Ondrej Zajicek | dfb0b8e | 2010-09-14 02:54:16 +0200 | [diff] [blame] | 277 | wdt_update_timeout(); |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 278 | |
| 279 | superio_exit(); |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 280 | |
| 281 | return 0; |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 282 | } |
| 283 | |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 284 | static int wdt_stop(void) |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 285 | { |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 286 | int ret = superio_enter(); |
| 287 | if (ret) |
| 288 | return ret; |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 289 | |
| 290 | superio_select(GPIO); |
| 291 | superio_outb(0x00, WDTCTRL); |
| 292 | superio_outb(WDT_TOV1, WDTCFG); |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 293 | superio_outb(0x00, WDTVALLSB); |
Ondrej Zajicek | dfb0b8e | 2010-09-14 02:54:16 +0200 | [diff] [blame] | 294 | if (max_units > 255) |
| 295 | superio_outb(0x00, WDTVALMSB); |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 296 | |
| 297 | superio_exit(); |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 298 | return 0; |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 299 | } |
| 300 | |
| 301 | /** |
| 302 | * wdt_set_timeout - set a new timeout value with watchdog ioctl |
| 303 | * @t: timeout value in seconds |
| 304 | * |
Ondrej Zajicek | dfb0b8e | 2010-09-14 02:54:16 +0200 | [diff] [blame] | 305 | * The hardware device has a 8 or 16 bit watchdog timer (depends on |
| 306 | * chip version) that can be configured to count seconds or minutes. |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 307 | * |
| 308 | * Used within WDIOC_SETTIMEOUT watchdog device ioctl. |
| 309 | */ |
| 310 | |
| 311 | static int wdt_set_timeout(int t) |
| 312 | { |
Ondrej Zajicek | dfb0b8e | 2010-09-14 02:54:16 +0200 | [diff] [blame] | 313 | if (t < 1 || t > max_units * 60) |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 314 | return -EINVAL; |
| 315 | |
Ondrej Zajicek | dfb0b8e | 2010-09-14 02:54:16 +0200 | [diff] [blame] | 316 | if (t > max_units) |
| 317 | timeout = wdt_round_time(t); |
| 318 | else |
| 319 | timeout = t; |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 320 | |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 321 | if (test_bit(WDTS_TIMER_RUN, &wdt_status)) { |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 322 | int ret = superio_enter(); |
| 323 | if (ret) |
| 324 | return ret; |
| 325 | |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 326 | superio_select(GPIO); |
Ondrej Zajicek | dfb0b8e | 2010-09-14 02:54:16 +0200 | [diff] [blame] | 327 | wdt_update_timeout(); |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 328 | superio_exit(); |
| 329 | } |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 330 | return 0; |
| 331 | } |
| 332 | |
| 333 | /** |
| 334 | * wdt_get_status - determines the status supported by watchdog ioctl |
| 335 | * @status: status returned to user space |
| 336 | * |
| 337 | * The status bit of the device does not allow to distinguish |
| 338 | * between a regular system reset and a watchdog forced reset. |
| 339 | * But, in test mode it is useful, so it is supported through |
| 340 | * WDIOC_GETSTATUS watchdog ioctl. Additionally the driver |
| 341 | * reports the keepalive signal and the acception of the magic. |
| 342 | * |
| 343 | * Used within WDIOC_GETSTATUS watchdog device ioctl. |
| 344 | */ |
| 345 | |
| 346 | static int wdt_get_status(int *status) |
| 347 | { |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 348 | *status = 0; |
| 349 | if (testmode) { |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 350 | int ret = superio_enter(); |
| 351 | if (ret) |
| 352 | return ret; |
| 353 | |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 354 | superio_select(GPIO); |
| 355 | if (superio_inb(WDTCTRL) & WDT_ZERO) { |
| 356 | superio_outb(0x00, WDTCTRL); |
| 357 | clear_bit(WDTS_TIMER_RUN, &wdt_status); |
| 358 | *status |= WDIOF_CARDRESET; |
| 359 | } |
| 360 | |
| 361 | superio_exit(); |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 362 | } |
| 363 | if (test_and_clear_bit(WDTS_KEEPALIVE, &wdt_status)) |
| 364 | *status |= WDIOF_KEEPALIVEPING; |
| 365 | if (test_bit(WDTS_EXPECTED, &wdt_status)) |
| 366 | *status |= WDIOF_MAGICCLOSE; |
| 367 | return 0; |
| 368 | } |
| 369 | |
| 370 | /* /dev/watchdog handling */ |
| 371 | |
| 372 | /** |
| 373 | * wdt_open - watchdog file_operations .open |
| 374 | * @inode: inode of the device |
| 375 | * @file: file handle to the device |
| 376 | * |
| 377 | * The watchdog timer starts by opening the device. |
| 378 | * |
| 379 | * Used within the file operation of the watchdog device. |
| 380 | */ |
| 381 | |
| 382 | static int wdt_open(struct inode *inode, struct file *file) |
| 383 | { |
| 384 | if (exclusive && test_and_set_bit(WDTS_DEV_OPEN, &wdt_status)) |
| 385 | return -EBUSY; |
| 386 | if (!test_and_set_bit(WDTS_TIMER_RUN, &wdt_status)) { |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 387 | int ret; |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 388 | if (nowayout && !test_and_set_bit(WDTS_LOCKED, &wdt_status)) |
| 389 | __module_get(THIS_MODULE); |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 390 | |
| 391 | ret = wdt_start(); |
| 392 | if (ret) { |
| 393 | clear_bit(WDTS_LOCKED, &wdt_status); |
| 394 | clear_bit(WDTS_TIMER_RUN, &wdt_status); |
| 395 | clear_bit(WDTS_DEV_OPEN, &wdt_status); |
| 396 | return ret; |
| 397 | } |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 398 | } |
| 399 | return nonseekable_open(inode, file); |
| 400 | } |
| 401 | |
| 402 | /** |
| 403 | * wdt_release - watchdog file_operations .release |
| 404 | * @inode: inode of the device |
| 405 | * @file: file handle to the device |
| 406 | * |
| 407 | * Closing the watchdog device either stops the watchdog timer |
| 408 | * or in the case, that nowayout is set or the magic character |
| 409 | * wasn't written, a critical warning about an running watchdog |
| 410 | * timer is given. |
| 411 | * |
| 412 | * Used within the file operation of the watchdog device. |
| 413 | */ |
| 414 | |
| 415 | static int wdt_release(struct inode *inode, struct file *file) |
| 416 | { |
| 417 | if (test_bit(WDTS_TIMER_RUN, &wdt_status)) { |
| 418 | if (test_and_clear_bit(WDTS_EXPECTED, &wdt_status)) { |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 419 | int ret = wdt_stop(); |
| 420 | if (ret) { |
| 421 | /* |
| 422 | * Stop failed. Just keep the watchdog alive |
| 423 | * and hope nothing bad happens. |
| 424 | */ |
| 425 | set_bit(WDTS_EXPECTED, &wdt_status); |
| 426 | wdt_keepalive(); |
| 427 | return ret; |
| 428 | } |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 429 | clear_bit(WDTS_TIMER_RUN, &wdt_status); |
| 430 | } else { |
| 431 | wdt_keepalive(); |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame^] | 432 | pr_crit("unexpected close, not stopping watchdog!\n"); |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 433 | } |
| 434 | } |
| 435 | clear_bit(WDTS_DEV_OPEN, &wdt_status); |
| 436 | return 0; |
| 437 | } |
| 438 | |
| 439 | /** |
| 440 | * wdt_write - watchdog file_operations .write |
| 441 | * @file: file handle to the watchdog |
| 442 | * @buf: buffer to write |
| 443 | * @count: count of bytes |
| 444 | * @ppos: pointer to the position to write. No seeks allowed |
| 445 | * |
| 446 | * A write to a watchdog device is defined as a keepalive signal. Any |
| 447 | * write of data will do, as we don't define content meaning. |
| 448 | * |
| 449 | * Used within the file operation of the watchdog device. |
| 450 | */ |
| 451 | |
| 452 | static ssize_t wdt_write(struct file *file, const char __user *buf, |
| 453 | size_t count, loff_t *ppos) |
| 454 | { |
| 455 | if (count) { |
| 456 | clear_bit(WDTS_EXPECTED, &wdt_status); |
| 457 | wdt_keepalive(); |
| 458 | } |
| 459 | if (!nowayout) { |
| 460 | size_t ofs; |
| 461 | |
| 462 | /* note: just in case someone wrote the magic character long ago */ |
| 463 | for (ofs = 0; ofs != count; ofs++) { |
| 464 | char c; |
| 465 | if (get_user(c, buf + ofs)) |
| 466 | return -EFAULT; |
| 467 | if (c == WD_MAGIC) |
| 468 | set_bit(WDTS_EXPECTED, &wdt_status); |
| 469 | } |
| 470 | } |
| 471 | return count; |
| 472 | } |
| 473 | |
Wim Van Sebroeck | 42747d7 | 2009-12-26 18:55:22 +0000 | [diff] [blame] | 474 | static const struct watchdog_info ident = { |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 475 | .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, |
| 476 | .firmware_version = 1, |
| 477 | .identity = WATCHDOG_NAME, |
| 478 | }; |
| 479 | |
| 480 | /** |
| 481 | * wdt_ioctl - watchdog file_operations .unlocked_ioctl |
| 482 | * @file: file handle to the device |
| 483 | * @cmd: watchdog command |
| 484 | * @arg: argument pointer |
| 485 | * |
| 486 | * The watchdog API defines a common set of functions for all watchdogs |
| 487 | * according to their available features. |
| 488 | * |
| 489 | * Used within the file operation of the watchdog device. |
| 490 | */ |
| 491 | |
| 492 | static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 493 | { |
| 494 | int rc = 0, status, new_options, new_timeout; |
| 495 | union { |
| 496 | struct watchdog_info __user *ident; |
| 497 | int __user *i; |
| 498 | } uarg; |
| 499 | |
| 500 | uarg.i = (int __user *)arg; |
| 501 | |
| 502 | switch (cmd) { |
| 503 | case WDIOC_GETSUPPORT: |
| 504 | return copy_to_user(uarg.ident, |
| 505 | &ident, sizeof(ident)) ? -EFAULT : 0; |
| 506 | |
| 507 | case WDIOC_GETSTATUS: |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 508 | rc = wdt_get_status(&status); |
| 509 | if (rc) |
| 510 | return rc; |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 511 | return put_user(status, uarg.i); |
| 512 | |
| 513 | case WDIOC_GETBOOTSTATUS: |
| 514 | return put_user(0, uarg.i); |
| 515 | |
| 516 | case WDIOC_KEEPALIVE: |
| 517 | wdt_keepalive(); |
| 518 | return 0; |
| 519 | |
| 520 | case WDIOC_SETOPTIONS: |
| 521 | if (get_user(new_options, uarg.i)) |
| 522 | return -EFAULT; |
| 523 | |
| 524 | switch (new_options) { |
| 525 | case WDIOS_DISABLECARD: |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 526 | if (test_bit(WDTS_TIMER_RUN, &wdt_status)) { |
| 527 | rc = wdt_stop(); |
| 528 | if (rc) |
| 529 | return rc; |
| 530 | } |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 531 | clear_bit(WDTS_TIMER_RUN, &wdt_status); |
| 532 | return 0; |
| 533 | |
| 534 | case WDIOS_ENABLECARD: |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 535 | if (!test_and_set_bit(WDTS_TIMER_RUN, &wdt_status)) { |
| 536 | rc = wdt_start(); |
| 537 | if (rc) { |
| 538 | clear_bit(WDTS_TIMER_RUN, &wdt_status); |
| 539 | return rc; |
| 540 | } |
| 541 | } |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 542 | return 0; |
| 543 | |
| 544 | default: |
| 545 | return -EFAULT; |
| 546 | } |
| 547 | |
| 548 | case WDIOC_SETTIMEOUT: |
| 549 | if (get_user(new_timeout, uarg.i)) |
| 550 | return -EFAULT; |
| 551 | rc = wdt_set_timeout(new_timeout); |
| 552 | case WDIOC_GETTIMEOUT: |
| 553 | if (put_user(timeout, uarg.i)) |
| 554 | return -EFAULT; |
| 555 | return rc; |
| 556 | |
| 557 | default: |
| 558 | return -ENOTTY; |
| 559 | } |
| 560 | } |
| 561 | |
| 562 | static int wdt_notify_sys(struct notifier_block *this, unsigned long code, |
| 563 | void *unused) |
| 564 | { |
| 565 | if (code == SYS_DOWN || code == SYS_HALT) |
| 566 | wdt_stop(); |
| 567 | return NOTIFY_DONE; |
| 568 | } |
| 569 | |
| 570 | static const struct file_operations wdt_fops = { |
| 571 | .owner = THIS_MODULE, |
| 572 | .llseek = no_llseek, |
| 573 | .write = wdt_write, |
| 574 | .unlocked_ioctl = wdt_ioctl, |
| 575 | .open = wdt_open, |
| 576 | .release = wdt_release, |
| 577 | }; |
| 578 | |
| 579 | static struct miscdevice wdt_miscdev = { |
| 580 | .minor = WATCHDOG_MINOR, |
| 581 | .name = "watchdog", |
| 582 | .fops = &wdt_fops, |
| 583 | }; |
| 584 | |
| 585 | static struct notifier_block wdt_notifier = { |
| 586 | .notifier_call = wdt_notify_sys, |
| 587 | }; |
| 588 | |
| 589 | static int __init it87_wdt_init(void) |
| 590 | { |
| 591 | int rc = 0; |
Ondrej Zajicek | ee3e965 | 2010-09-14 02:47:28 +0200 | [diff] [blame] | 592 | int try_gameport = !nogameport; |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 593 | u8 chip_rev; |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 594 | int gp_rreq_fail = 0; |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 595 | |
Ondrej Zajicek | dfb0b8e | 2010-09-14 02:54:16 +0200 | [diff] [blame] | 596 | wdt_status = 0; |
| 597 | |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 598 | rc = superio_enter(); |
| 599 | if (rc) |
| 600 | return rc; |
| 601 | |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 602 | chip_type = superio_inw(CHIPID); |
| 603 | chip_rev = superio_inb(CHIPREV) & 0x0f; |
| 604 | superio_exit(); |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 605 | |
| 606 | switch (chip_type) { |
Ondrej Zajicek | dfb0b8e | 2010-09-14 02:54:16 +0200 | [diff] [blame] | 607 | case IT8702_ID: |
| 608 | max_units = 255; |
| 609 | break; |
| 610 | case IT8712_ID: |
| 611 | max_units = (chip_rev < 8) ? 255 : 65535; |
| 612 | break; |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 613 | case IT8716_ID: |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 614 | case IT8726_ID: |
Ondrej Zajicek | dfb0b8e | 2010-09-14 02:54:16 +0200 | [diff] [blame] | 615 | max_units = 65535; |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 616 | break; |
Ondrej Zajicek | ee3e965 | 2010-09-14 02:47:28 +0200 | [diff] [blame] | 617 | case IT8718_ID: |
| 618 | case IT8720_ID: |
Huaro Tomita | 4bc3027 | 2011-01-21 07:37:51 +0900 | [diff] [blame] | 619 | case IT8721_ID: |
Ondrej Zajicek | dfb0b8e | 2010-09-14 02:54:16 +0200 | [diff] [blame] | 620 | max_units = 65535; |
Ondrej Zajicek | ee3e965 | 2010-09-14 02:47:28 +0200 | [diff] [blame] | 621 | try_gameport = 0; |
| 622 | break; |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 623 | case IT8705_ID: |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame^] | 624 | pr_err("Unsupported Chip found, Chip %04x Revision %02x\n", |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 625 | chip_type, chip_rev); |
| 626 | return -ENODEV; |
| 627 | case NO_DEV_ID: |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame^] | 628 | pr_err("no device\n"); |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 629 | return -ENODEV; |
| 630 | default: |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame^] | 631 | pr_err("Unknown Chip found, Chip %04x Revision %04x\n", |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 632 | chip_type, chip_rev); |
| 633 | return -ENODEV; |
| 634 | } |
| 635 | |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 636 | rc = superio_enter(); |
| 637 | if (rc) |
| 638 | return rc; |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 639 | |
| 640 | superio_select(GPIO); |
| 641 | superio_outb(WDT_TOV1, WDTCFG); |
| 642 | superio_outb(0x00, WDTCTRL); |
| 643 | |
| 644 | /* First try to get Gameport support */ |
Ondrej Zajicek | ee3e965 | 2010-09-14 02:47:28 +0200 | [diff] [blame] | 645 | if (try_gameport) { |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 646 | superio_select(GAMEPORT); |
| 647 | base = superio_inw(BASEREG); |
| 648 | if (!base) { |
| 649 | base = GP_BASE_DEFAULT; |
| 650 | superio_outw(base, BASEREG); |
| 651 | } |
| 652 | gpact = superio_inb(ACTREG); |
| 653 | superio_outb(0x01, ACTREG); |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 654 | if (request_region(base, 1, WATCHDOG_NAME)) |
| 655 | set_bit(WDTS_USE_GP, &wdt_status); |
| 656 | else |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 657 | gp_rreq_fail = 1; |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 658 | } |
| 659 | |
| 660 | /* If we haven't Gameport support, try to get CIR support */ |
| 661 | if (!test_bit(WDTS_USE_GP, &wdt_status)) { |
| 662 | if (!request_region(CIR_BASE, 8, WATCHDOG_NAME)) { |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 663 | if (gp_rreq_fail) |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame^] | 664 | pr_err("I/O Address 0x%04x and 0x%04x already in use\n", |
| 665 | base, CIR_BASE); |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 666 | else |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame^] | 667 | pr_err("I/O Address 0x%04x already in use\n", |
| 668 | CIR_BASE); |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 669 | rc = -EIO; |
| 670 | goto err_out; |
| 671 | } |
| 672 | base = CIR_BASE; |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 673 | |
| 674 | superio_select(CIR); |
| 675 | superio_outw(base, BASEREG); |
| 676 | superio_outb(0x00, CIR_ILS); |
| 677 | ciract = superio_inb(ACTREG); |
| 678 | superio_outb(0x01, ACTREG); |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 679 | if (gp_rreq_fail) { |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 680 | superio_select(GAMEPORT); |
| 681 | superio_outb(gpact, ACTREG); |
| 682 | } |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 683 | } |
| 684 | |
Ondrej Zajicek | dfb0b8e | 2010-09-14 02:54:16 +0200 | [diff] [blame] | 685 | if (timeout < 1 || timeout > max_units * 60) { |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 686 | timeout = DEFAULT_TIMEOUT; |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame^] | 687 | pr_warn("Timeout value out of range, use default %d sec\n", |
| 688 | DEFAULT_TIMEOUT); |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 689 | } |
| 690 | |
Ondrej Zajicek | dfb0b8e | 2010-09-14 02:54:16 +0200 | [diff] [blame] | 691 | if (timeout > max_units) |
| 692 | timeout = wdt_round_time(timeout); |
| 693 | |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 694 | rc = register_reboot_notifier(&wdt_notifier); |
| 695 | if (rc) { |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame^] | 696 | pr_err("Cannot register reboot notifier (err=%d)\n", rc); |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 697 | goto err_out_region; |
| 698 | } |
| 699 | |
| 700 | rc = misc_register(&wdt_miscdev); |
| 701 | if (rc) { |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame^] | 702 | pr_err("Cannot register miscdev on minor=%d (err=%d)\n", |
| 703 | wdt_miscdev.minor, rc); |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 704 | goto err_out_reboot; |
| 705 | } |
| 706 | |
| 707 | /* Initialize CIR to use it as keepalive source */ |
| 708 | if (!test_bit(WDTS_USE_GP, &wdt_status)) { |
| 709 | outb(0x00, CIR_RCR(base)); |
| 710 | outb(0xc0, CIR_TCR1(base)); |
| 711 | outb(0x5c, CIR_TCR2(base)); |
| 712 | outb(0x10, CIR_IER(base)); |
| 713 | outb(0x00, CIR_BDHR(base)); |
| 714 | outb(0x01, CIR_BDLR(base)); |
| 715 | outb(0x09, CIR_IER(base)); |
| 716 | } |
| 717 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame^] | 718 | pr_info("Chip IT%04x revision %d initialized. timeout=%d sec (nowayout=%d testmode=%d exclusive=%d nogameport=%d)\n", |
| 719 | chip_type, chip_rev, timeout, |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 720 | nowayout, testmode, exclusive, nogameport); |
| 721 | |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 722 | superio_exit(); |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 723 | return 0; |
| 724 | |
| 725 | err_out_reboot: |
| 726 | unregister_reboot_notifier(&wdt_notifier); |
| 727 | err_out_region: |
| 728 | release_region(base, test_bit(WDTS_USE_GP, &wdt_status) ? 1 : 8); |
| 729 | if (!test_bit(WDTS_USE_GP, &wdt_status)) { |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 730 | superio_select(CIR); |
| 731 | superio_outb(ciract, ACTREG); |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 732 | } |
| 733 | err_out: |
Ondrej Zajicek | ee3e965 | 2010-09-14 02:47:28 +0200 | [diff] [blame] | 734 | if (try_gameport) { |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 735 | superio_select(GAMEPORT); |
| 736 | superio_outb(gpact, ACTREG); |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 737 | } |
| 738 | |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 739 | superio_exit(); |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 740 | return rc; |
| 741 | } |
| 742 | |
| 743 | static void __exit it87_wdt_exit(void) |
| 744 | { |
Nat Gurumoorthy | a134b82 | 2011-05-09 11:45:07 -0700 | [diff] [blame] | 745 | if (superio_enter() == 0) { |
| 746 | superio_select(GPIO); |
| 747 | superio_outb(0x00, WDTCTRL); |
| 748 | superio_outb(0x00, WDTCFG); |
| 749 | superio_outb(0x00, WDTVALLSB); |
| 750 | if (max_units > 255) |
| 751 | superio_outb(0x00, WDTVALMSB); |
| 752 | if (test_bit(WDTS_USE_GP, &wdt_status)) { |
| 753 | superio_select(GAMEPORT); |
| 754 | superio_outb(gpact, ACTREG); |
| 755 | } else { |
| 756 | superio_select(CIR); |
| 757 | superio_outb(ciract, ACTREG); |
| 758 | } |
| 759 | superio_exit(); |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 760 | } |
Oliver Schuster | e1fee94 | 2008-03-05 16:48:45 +0100 | [diff] [blame] | 761 | |
| 762 | misc_deregister(&wdt_miscdev); |
| 763 | unregister_reboot_notifier(&wdt_notifier); |
| 764 | release_region(base, test_bit(WDTS_USE_GP, &wdt_status) ? 1 : 8); |
| 765 | } |
| 766 | |
| 767 | module_init(it87_wdt_init); |
| 768 | module_exit(it87_wdt_exit); |
| 769 | |
| 770 | MODULE_AUTHOR("Oliver Schuster"); |
| 771 | MODULE_DESCRIPTION("Hardware Watchdog Device Driver for IT87xx EC-LPC I/O"); |
| 772 | MODULE_LICENSE("GPL"); |
| 773 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |