Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 1 | /* |
Samuel Tardieu | de710d6 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 2 | * w83697hf/hg WDT driver |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 3 | * |
Samuel Tardieu | 3fdee8d | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 4 | * (c) Copyright 2006 Samuel Tardieu <sam@rfc1149.net> |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 5 | * (c) Copyright 2006 Marcus Junker <junker@anduras.de> |
| 6 | * |
Samuel Tardieu | de710d6 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 7 | * Based on w83627hf_wdt.c which is based on advantechwdt.c |
| 8 | * which is based on wdt.c. |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 9 | * Original copyright messages: |
| 10 | * |
Jan Engelhardt | 96de0e2 | 2007-10-19 23:21:04 +0200 | [diff] [blame] | 11 | * (c) Copyright 2003 Pádraig Brady <P@draigBrady.com> |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 12 | * |
| 13 | * (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl> |
| 14 | * |
| 15 | * (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved. |
| 16 | * http://www.redhat.com |
| 17 | * |
| 18 | * This program is free software; you can redistribute it and/or |
| 19 | * modify it under the terms of the GNU General Public License |
| 20 | * as published by the Free Software Foundation; either version |
| 21 | * 2 of the License, or (at your option) any later version. |
| 22 | * |
| 23 | * Neither Marcus Junker nor ANDURAS AG admit liability nor provide |
| 24 | * warranty for any of this software. This material is provided |
| 25 | * "AS-IS" and at no charge. |
| 26 | */ |
| 27 | |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/moduleparam.h> |
| 30 | #include <linux/types.h> |
| 31 | #include <linux/miscdevice.h> |
| 32 | #include <linux/watchdog.h> |
| 33 | #include <linux/fs.h> |
| 34 | #include <linux/ioport.h> |
| 35 | #include <linux/notifier.h> |
| 36 | #include <linux/reboot.h> |
| 37 | #include <linux/init.h> |
Wim Van Sebroeck | ab9d441 | 2006-09-02 18:50:20 +0200 | [diff] [blame] | 38 | #include <linux/spinlock.h> |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 39 | #include <linux/io.h> |
| 40 | #include <linux/uaccess.h> |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 41 | |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 42 | #include <asm/system.h> |
| 43 | |
Samuel Tardieu | de710d6 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 44 | #define WATCHDOG_NAME "w83697hf/hg WDT" |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 45 | #define PFX WATCHDOG_NAME ": " |
| 46 | #define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */ |
Samuel Tardieu | 6fd6560 | 2008-03-12 14:28:03 +0100 | [diff] [blame] | 47 | #define WATCHDOG_EARLY_DISABLE 1 /* Disable until userland kicks in */ |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 48 | |
| 49 | static unsigned long wdt_is_open; |
| 50 | static char expect_close; |
Alexey Dobriyan | c7dfd0c | 2007-11-01 16:27:08 -0700 | [diff] [blame] | 51 | static DEFINE_SPINLOCK(io_lock); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 52 | |
| 53 | /* You must set this - there is no sane way to probe for this board. */ |
Samuel Tardieu | c81b299 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 54 | static int wdt_io = 0x2e; |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 55 | module_param(wdt_io, int, 0); |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 56 | MODULE_PARM_DESC(wdt_io, |
| 57 | "w83697hf/hg WDT io port (default 0x2e, 0 = autodetect)"); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 58 | |
| 59 | static int timeout = WATCHDOG_TIMEOUT; /* in seconds */ |
| 60 | module_param(timeout, int, 0); |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 61 | MODULE_PARM_DESC(timeout, |
| 62 | "Watchdog timeout in seconds. 1<= timeout <=255 (default=" |
| 63 | __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 64 | |
| 65 | static int nowayout = WATCHDOG_NOWAYOUT; |
| 66 | module_param(nowayout, int, 0); |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 67 | MODULE_PARM_DESC(nowayout, |
| 68 | "Watchdog cannot be stopped once started (default=" |
| 69 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 70 | |
Samuel Tardieu | 6fd6560 | 2008-03-12 14:28:03 +0100 | [diff] [blame] | 71 | static int early_disable = WATCHDOG_EARLY_DISABLE; |
| 72 | module_param(early_disable, int, 0); |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 73 | MODULE_PARM_DESC(early_disable, |
| 74 | "Watchdog gets disabled at boot time (default=" |
| 75 | __MODULE_STRING(WATCHDOG_EARLY_DISABLE) ")"); |
Samuel Tardieu | 6fd6560 | 2008-03-12 14:28:03 +0100 | [diff] [blame] | 76 | |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 77 | /* |
| 78 | * Kernel methods. |
| 79 | */ |
| 80 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 81 | #define W83697HF_EFER (wdt_io + 0) /* Extended Function Enable Register */ |
| 82 | #define W83697HF_EFIR (wdt_io + 0) /* Extended Function Index Register |
| 83 | (same as EFER) */ |
| 84 | #define W83697HF_EFDR (wdt_io + 1) /* Extended Function Data Register */ |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 85 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 86 | static inline void w83697hf_unlock(void) |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 87 | { |
Samuel Tardieu | 44d7d32 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 88 | outb_p(0x87, W83697HF_EFER); /* Enter extended function mode */ |
| 89 | outb_p(0x87, W83697HF_EFER); /* Again according to manual */ |
Samuel Tardieu | f7be332 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 90 | } |
| 91 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 92 | static inline void w83697hf_lock(void) |
Samuel Tardieu | fe851eb | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 93 | { |
| 94 | outb_p(0xAA, W83697HF_EFER); /* Leave extended function mode */ |
| 95 | } |
| 96 | |
Samuel Tardieu | 0cd5447 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 97 | /* |
Samuel Tardieu | d46ab59 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 98 | * The three functions w83697hf_get_reg(), w83697hf_set_reg() and |
| 99 | * w83697hf_write_timeout() must be called with the device unlocked. |
Samuel Tardieu | 0cd5447 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 100 | */ |
| 101 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 102 | static unsigned char w83697hf_get_reg(unsigned char reg) |
Samuel Tardieu | 0cd5447 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 103 | { |
| 104 | outb_p(reg, W83697HF_EFIR); |
| 105 | return inb_p(W83697HF_EFDR); |
| 106 | } |
| 107 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 108 | static void w83697hf_set_reg(unsigned char reg, unsigned char data) |
Samuel Tardieu | 0cd5447 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 109 | { |
| 110 | outb_p(reg, W83697HF_EFIR); |
| 111 | outb_p(data, W83697HF_EFDR); |
| 112 | } |
| 113 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 114 | static void w83697hf_write_timeout(int timeout) |
Samuel Tardieu | d46ab59 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 115 | { |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 116 | /* Write Timeout counter to CRF4 */ |
| 117 | w83697hf_set_reg(0xF4, timeout); |
Samuel Tardieu | d46ab59 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 118 | } |
| 119 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 120 | static void w83697hf_select_wdt(void) |
Samuel Tardieu | a7933e0 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 121 | { |
| 122 | w83697hf_unlock(); |
| 123 | w83697hf_set_reg(0x07, 0x08); /* Switch to logic device 8 (GPIO2) */ |
| 124 | } |
| 125 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 126 | static inline void w83697hf_deselect_wdt(void) |
Samuel Tardieu | a7933e0 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 127 | { |
| 128 | w83697hf_lock(); |
| 129 | } |
| 130 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 131 | static void w83697hf_init(void) |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 132 | { |
Samuel Tardieu | b7b9868 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 133 | unsigned char bbuf; |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 134 | |
Samuel Tardieu | fa69afd | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 135 | w83697hf_select_wdt(); |
| 136 | |
Samuel Tardieu | b7b9868 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 137 | bbuf = w83697hf_get_reg(0x29); |
| 138 | bbuf &= ~0x60; |
| 139 | bbuf |= 0x20; |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 140 | |
| 141 | /* Set pin 119 to WDTO# mode (= CR29, WDT0) */ |
| 142 | w83697hf_set_reg(0x29, bbuf); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 143 | |
Samuel Tardieu | b7b9868 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 144 | bbuf = w83697hf_get_reg(0xF3); |
| 145 | bbuf &= ~0x04; |
| 146 | w83697hf_set_reg(0xF3, bbuf); /* Count mode is seconds */ |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 147 | |
Samuel Tardieu | fa69afd | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 148 | w83697hf_deselect_wdt(); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 149 | } |
| 150 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 151 | static void wdt_ping(void) |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 152 | { |
Wim Van Sebroeck | ab9d441 | 2006-09-02 18:50:20 +0200 | [diff] [blame] | 153 | spin_lock(&io_lock); |
Samuel Tardieu | a7933e0 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 154 | w83697hf_select_wdt(); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 155 | |
Samuel Tardieu | d46ab59 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 156 | w83697hf_write_timeout(timeout); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 157 | |
Samuel Tardieu | a7933e0 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 158 | w83697hf_deselect_wdt(); |
Wim Van Sebroeck | ab9d441 | 2006-09-02 18:50:20 +0200 | [diff] [blame] | 159 | spin_unlock(&io_lock); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 160 | } |
| 161 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 162 | static void wdt_enable(void) |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 163 | { |
Samuel Tardieu | 089d813 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 164 | spin_lock(&io_lock); |
| 165 | w83697hf_select_wdt(); |
| 166 | |
| 167 | w83697hf_write_timeout(timeout); |
| 168 | w83697hf_set_reg(0x30, 1); /* Enable timer */ |
| 169 | |
| 170 | w83697hf_deselect_wdt(); |
| 171 | spin_unlock(&io_lock); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 172 | } |
| 173 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 174 | static void wdt_disable(void) |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 175 | { |
Samuel Tardieu | 089d813 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 176 | spin_lock(&io_lock); |
| 177 | w83697hf_select_wdt(); |
| 178 | |
| 179 | w83697hf_set_reg(0x30, 0); /* Disable timer */ |
| 180 | w83697hf_write_timeout(0); |
| 181 | |
| 182 | w83697hf_deselect_wdt(); |
| 183 | spin_unlock(&io_lock); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 184 | } |
| 185 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 186 | static unsigned char wdt_running(void) |
Samuel Tardieu | 6fd6560 | 2008-03-12 14:28:03 +0100 | [diff] [blame] | 187 | { |
| 188 | unsigned char t; |
| 189 | |
| 190 | spin_lock(&io_lock); |
| 191 | w83697hf_select_wdt(); |
| 192 | |
| 193 | t = w83697hf_get_reg(0xF4); /* Read timer */ |
| 194 | |
| 195 | w83697hf_deselect_wdt(); |
| 196 | spin_unlock(&io_lock); |
| 197 | |
| 198 | return t; |
| 199 | } |
| 200 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 201 | static int wdt_set_heartbeat(int t) |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 202 | { |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 203 | if (t < 1 || t > 255) |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 204 | return -EINVAL; |
| 205 | |
| 206 | timeout = t; |
| 207 | return 0; |
| 208 | } |
| 209 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 210 | static ssize_t wdt_write(struct file *file, const char __user *buf, |
| 211 | size_t count, loff_t *ppos) |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 212 | { |
| 213 | if (count) { |
| 214 | if (!nowayout) { |
| 215 | size_t i; |
| 216 | |
| 217 | expect_close = 0; |
| 218 | |
| 219 | for (i = 0; i != count; i++) { |
| 220 | char c; |
| 221 | if (get_user(c, buf+i)) |
| 222 | return -EFAULT; |
| 223 | if (c == 'V') |
| 224 | expect_close = 42; |
| 225 | } |
| 226 | } |
| 227 | wdt_ping(); |
| 228 | } |
| 229 | return count; |
| 230 | } |
| 231 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 232 | static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 233 | { |
| 234 | void __user *argp = (void __user *)arg; |
| 235 | int __user *p = argp; |
| 236 | int new_timeout; |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 237 | static const struct watchdog_info ident = { |
| 238 | .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
| 239 | | WDIOF_MAGICCLOSE, |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 240 | .firmware_version = 1, |
| 241 | .identity = "W83697HF WDT", |
| 242 | }; |
| 243 | |
| 244 | switch (cmd) { |
| 245 | case WDIOC_GETSUPPORT: |
Samuel Tardieu | db16525 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 246 | if (copy_to_user(argp, &ident, sizeof(ident))) |
| 247 | return -EFAULT; |
| 248 | break; |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 249 | |
| 250 | case WDIOC_GETSTATUS: |
| 251 | case WDIOC_GETBOOTSTATUS: |
Samuel Tardieu | db16525 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 252 | return put_user(0, p); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 253 | |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 254 | case WDIOC_SETOPTIONS: |
| 255 | { |
Samuel Tardieu | db16525 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 256 | int options, retval = -EINVAL; |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 257 | |
Samuel Tardieu | db16525 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 258 | if (get_user(options, p)) |
| 259 | return -EFAULT; |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 260 | |
Samuel Tardieu | db16525 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 261 | if (options & WDIOS_DISABLECARD) { |
| 262 | wdt_disable(); |
| 263 | retval = 0; |
| 264 | } |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 265 | |
Samuel Tardieu | db16525 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 266 | if (options & WDIOS_ENABLECARD) { |
Samuel Tardieu | 089d813 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 267 | wdt_enable(); |
Samuel Tardieu | db16525 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 268 | retval = 0; |
| 269 | } |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 270 | |
Samuel Tardieu | db16525 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 271 | return retval; |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 272 | } |
| 273 | |
Wim Van Sebroeck | 0c06090 | 2008-07-18 11:41:17 +0000 | [diff] [blame] | 274 | case WDIOC_KEEPALIVE: |
| 275 | wdt_ping(); |
| 276 | break; |
| 277 | |
| 278 | case WDIOC_SETTIMEOUT: |
| 279 | if (get_user(new_timeout, p)) |
| 280 | return -EFAULT; |
| 281 | if (wdt_set_heartbeat(new_timeout)) |
| 282 | return -EINVAL; |
| 283 | wdt_ping(); |
| 284 | /* Fall */ |
| 285 | |
| 286 | case WDIOC_GETTIMEOUT: |
| 287 | return put_user(timeout, p); |
| 288 | |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 289 | default: |
Samuel Tardieu | db16525 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 290 | return -ENOTTY; |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 291 | } |
| 292 | return 0; |
| 293 | } |
| 294 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 295 | static int wdt_open(struct inode *inode, struct file *file) |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 296 | { |
| 297 | if (test_and_set_bit(0, &wdt_is_open)) |
| 298 | return -EBUSY; |
| 299 | /* |
| 300 | * Activate |
| 301 | */ |
| 302 | |
Samuel Tardieu | 089d813 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 303 | wdt_enable(); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 304 | return nonseekable_open(inode, file); |
| 305 | } |
| 306 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 307 | static int wdt_close(struct inode *inode, struct file *file) |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 308 | { |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 309 | if (expect_close == 42) |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 310 | wdt_disable(); |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 311 | else { |
| 312 | printk(KERN_CRIT PFX |
| 313 | "Unexpected close, not stopping watchdog!\n"); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 314 | wdt_ping(); |
| 315 | } |
| 316 | expect_close = 0; |
| 317 | clear_bit(0, &wdt_is_open); |
| 318 | return 0; |
| 319 | } |
| 320 | |
| 321 | /* |
| 322 | * Notifier for system down |
| 323 | */ |
| 324 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 325 | static int wdt_notify_sys(struct notifier_block *this, unsigned long code, |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 326 | void *unused) |
| 327 | { |
| 328 | if (code == SYS_DOWN || code == SYS_HALT) { |
| 329 | /* Turn the WDT off */ |
| 330 | wdt_disable(); |
| 331 | } |
| 332 | return NOTIFY_DONE; |
| 333 | } |
| 334 | |
| 335 | /* |
| 336 | * Kernel Interfaces |
| 337 | */ |
| 338 | |
Arjan van de Ven | 2b8693c | 2007-02-12 00:55:32 -0800 | [diff] [blame] | 339 | static const struct file_operations wdt_fops = { |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 340 | .owner = THIS_MODULE, |
| 341 | .llseek = no_llseek, |
| 342 | .write = wdt_write, |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 343 | .unlocked_ioctl = wdt_ioctl, |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 344 | .open = wdt_open, |
| 345 | .release = wdt_close, |
| 346 | }; |
| 347 | |
| 348 | static struct miscdevice wdt_miscdev = { |
| 349 | .minor = WATCHDOG_MINOR, |
| 350 | .name = "watchdog", |
| 351 | .fops = &wdt_fops, |
| 352 | }; |
| 353 | |
| 354 | /* |
| 355 | * The WDT needs to learn about soft shutdowns in order to |
| 356 | * turn the timebomb registers off. |
| 357 | */ |
| 358 | |
| 359 | static struct notifier_block wdt_notifier = { |
| 360 | .notifier_call = wdt_notify_sys, |
| 361 | }; |
| 362 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 363 | static int w83697hf_check_wdt(void) |
Samuel Tardieu | c81b299 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 364 | { |
| 365 | if (!request_region(wdt_io, 2, WATCHDOG_NAME)) { |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 366 | printk(KERN_ERR PFX |
| 367 | "I/O address 0x%x already in use\n", wdt_io); |
Samuel Tardieu | c81b299 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 368 | return -EIO; |
| 369 | } |
| 370 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 371 | printk(KERN_DEBUG PFX |
| 372 | "Looking for watchdog at address 0x%x\n", wdt_io); |
Samuel Tardieu | c81b299 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 373 | w83697hf_unlock(); |
| 374 | if (w83697hf_get_reg(0x20) == 0x60) { |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 375 | printk(KERN_INFO PFX |
| 376 | "watchdog found at address 0x%x\n", wdt_io); |
Samuel Tardieu | c81b299 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 377 | w83697hf_lock(); |
| 378 | return 0; |
| 379 | } |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 380 | /* Reprotect in case it was a compatible device */ |
| 381 | w83697hf_lock(); |
Samuel Tardieu | c81b299 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 382 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 383 | printk(KERN_INFO PFX "watchdog not found at address 0x%x\n", wdt_io); |
Samuel Tardieu | c81b299 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 384 | release_region(wdt_io, 2); |
| 385 | return -EIO; |
| 386 | } |
| 387 | |
Wim Van Sebroeck | e223f01 | 2006-09-15 17:59:07 +0200 | [diff] [blame] | 388 | static int w83697hf_ioports[] = { 0x2e, 0x4e, 0x00 }; |
| 389 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 390 | static int __init wdt_init(void) |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 391 | { |
Wim Van Sebroeck | e223f01 | 2006-09-15 17:59:07 +0200 | [diff] [blame] | 392 | int ret, i, found = 0; |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 393 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 394 | printk(KERN_INFO PFX "WDT driver for W83697HF/HG initializing\n"); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 395 | |
Wim Van Sebroeck | e223f01 | 2006-09-15 17:59:07 +0200 | [diff] [blame] | 396 | if (wdt_io == 0) { |
| 397 | /* we will autodetect the W83697HF/HG watchdog */ |
| 398 | for (i = 0; ((!found) && (w83697hf_ioports[i] != 0)); i++) { |
| 399 | wdt_io = w83697hf_ioports[i]; |
Wim Van Sebroeck | cde10ba | 2008-01-18 21:01:34 +0000 | [diff] [blame] | 400 | if (!w83697hf_check_wdt()) |
Wim Van Sebroeck | e223f01 | 2006-09-15 17:59:07 +0200 | [diff] [blame] | 401 | found++; |
| 402 | } |
| 403 | } else { |
Samuel Tardieu | c81b299 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 404 | if (!w83697hf_check_wdt()) |
Wim Van Sebroeck | e223f01 | 2006-09-15 17:59:07 +0200 | [diff] [blame] | 405 | found++; |
Samuel Tardieu | c81b299 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 406 | } |
| 407 | |
Wim Van Sebroeck | e223f01 | 2006-09-15 17:59:07 +0200 | [diff] [blame] | 408 | if (!found) { |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 409 | printk(KERN_ERR PFX "No W83697HF/HG could be found\n"); |
Wim Van Sebroeck | e223f01 | 2006-09-15 17:59:07 +0200 | [diff] [blame] | 410 | ret = -EIO; |
| 411 | goto out; |
| 412 | } |
Samuel Tardieu | c81b299 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 413 | |
Samuel Tardieu | fa69afd | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 414 | w83697hf_init(); |
Samuel Tardieu | 6fd6560 | 2008-03-12 14:28:03 +0100 | [diff] [blame] | 415 | if (early_disable) { |
| 416 | if (wdt_running()) |
| 417 | printk (KERN_WARNING PFX "Stopping previously enabled watchdog until userland kicks in\n"); |
| 418 | wdt_disable(); |
| 419 | } |
Samuel Tardieu | c81b299 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 420 | |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 421 | if (wdt_set_heartbeat(timeout)) { |
| 422 | wdt_set_heartbeat(WATCHDOG_TIMEOUT); |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 423 | printk(KERN_INFO PFX |
| 424 | "timeout value must be 1 <= timeout <= 255, using %d\n", |
| 425 | WATCHDOG_TIMEOUT); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 426 | } |
| 427 | |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 428 | ret = register_reboot_notifier(&wdt_notifier); |
| 429 | if (ret != 0) { |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 430 | printk(KERN_ERR PFX |
| 431 | "cannot register reboot notifier (err=%d)\n", ret); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 432 | goto unreg_regions; |
| 433 | } |
| 434 | |
| 435 | ret = misc_register(&wdt_miscdev); |
| 436 | if (ret != 0) { |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 437 | printk(KERN_ERR PFX |
| 438 | "cannot register miscdev on minor=%d (err=%d)\n", |
| 439 | WATCHDOG_MINOR, ret); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 440 | goto unreg_reboot; |
| 441 | } |
| 442 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 443 | printk(KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n", |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 444 | timeout, nowayout); |
| 445 | |
| 446 | out: |
| 447 | return ret; |
| 448 | unreg_reboot: |
| 449 | unregister_reboot_notifier(&wdt_notifier); |
| 450 | unreg_regions: |
Samuel Tardieu | b41a9f5 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 451 | release_region(wdt_io, 2); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 452 | goto out; |
| 453 | } |
| 454 | |
Alan Cox | c1c8dd3 | 2008-05-19 14:09:23 +0100 | [diff] [blame] | 455 | static void __exit wdt_exit(void) |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 456 | { |
| 457 | misc_deregister(&wdt_miscdev); |
| 458 | unregister_reboot_notifier(&wdt_notifier); |
Samuel Tardieu | b41a9f5 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 459 | release_region(wdt_io, 2); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 460 | } |
| 461 | |
| 462 | module_init(wdt_init); |
| 463 | module_exit(wdt_exit); |
| 464 | |
| 465 | MODULE_LICENSE("GPL"); |
Samuel Tardieu | 3fdee8d | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 466 | MODULE_AUTHOR("Marcus Junker <junker@anduras.de>, Samuel Tardieu <sam@rfc1149.net>"); |
Samuel Tardieu | de710d6 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 467 | MODULE_DESCRIPTION("w83697hf/hg WDT driver"); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 468 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |