Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * IB700 Single Board Computer WDT driver |
| 3 | * |
| 4 | * (c) Copyright 2001 Charles Howes <chowes@vsol.net> |
| 5 | * |
Wim Van Sebroeck | c9d7710 | 2007-01-27 22:07:03 +0100 | [diff] [blame] | 6 | * Based on advantechwdt.c which is based on acquirewdt.c which |
| 7 | * is based on wdt.c. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * |
| 9 | * (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl> |
| 10 | * |
| 11 | * Based on acquirewdt.c which is based on wdt.c. |
| 12 | * Original copyright messages: |
| 13 | * |
Alan Cox | 29fa058 | 2008-10-27 15:17:56 +0000 | [diff] [blame] | 14 | * (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>, |
| 15 | * All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [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 | * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide |
| 23 | * warranty for any of this software. This material is provided |
| 24 | * "AS-IS" and at no charge. |
| 25 | * |
Alan Cox | 29fa058 | 2008-10-27 15:17:56 +0000 | [diff] [blame] | 26 | * (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | * |
Wim Van Sebroeck | c9d7710 | 2007-01-27 22:07:03 +0100 | [diff] [blame] | 28 | * 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com> |
| 29 | * Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT |
| 30 | * Added timeout module option to override default |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | * |
| 32 | */ |
| 33 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/module.h> |
| 35 | #include <linux/types.h> |
| 36 | #include <linux/miscdevice.h> |
| 37 | #include <linux/watchdog.h> |
| 38 | #include <linux/ioport.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <linux/fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <linux/init.h> |
| 41 | #include <linux/spinlock.h> |
| 42 | #include <linux/moduleparam.h> |
Wim Van Sebroeck | 745ac1ea | 2007-01-27 22:39:46 +0100 | [diff] [blame] | 43 | #include <linux/platform_device.h> |
Alan Cox | 2e43ba7 | 2008-05-19 14:05:52 +0100 | [diff] [blame] | 44 | #include <linux/io.h> |
| 45 | #include <linux/uaccess.h> |
Wim Van Sebroeck | 089ab07 | 2008-07-15 11:46:11 +0000 | [diff] [blame] | 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include <asm/system.h> |
| 48 | |
Wim Van Sebroeck | 745ac1ea | 2007-01-27 22:39:46 +0100 | [diff] [blame] | 49 | static struct platform_device *ibwdt_platform_device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | static unsigned long ibwdt_is_open; |
Alexey Dobriyan | c7dfd0c | 2007-11-01 16:27:08 -0700 | [diff] [blame] | 51 | static DEFINE_SPINLOCK(ibwdt_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | static char expect_close; |
| 53 | |
Wim Van Sebroeck | 745ac1ea | 2007-01-27 22:39:46 +0100 | [diff] [blame] | 54 | /* Module information */ |
| 55 | #define DRV_NAME "ib700wdt" |
| 56 | #define PFX DRV_NAME ": " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
| 58 | /* |
| 59 | * |
| 60 | * Watchdog Timer Configuration |
| 61 | * |
| 62 | * The function of the watchdog timer is to reset the system |
| 63 | * automatically and is defined at I/O port 0443H. To enable the |
| 64 | * watchdog timer and allow the system to reset, write I/O port 0443H. |
| 65 | * To disable the timer, write I/O port 0441H for the system to stop the |
| 66 | * watchdog function. The timer has a tolerance of 20% for its |
| 67 | * intervals. |
| 68 | * |
| 69 | * The following describes how the timer should be programmed. |
| 70 | * |
| 71 | * Enabling Watchdog: |
| 72 | * MOV AX,000FH (Choose the values from 0 to F) |
| 73 | * MOV DX,0443H |
| 74 | * OUT DX,AX |
| 75 | * |
| 76 | * Disabling Watchdog: |
| 77 | * MOV AX,000FH (Any value is fine.) |
| 78 | * MOV DX,0441H |
| 79 | * OUT DX,AX |
| 80 | * |
| 81 | * Watchdog timer control table: |
| 82 | * Level Value Time/sec | Level Value Time/sec |
| 83 | * 1 F 0 | 9 7 16 |
| 84 | * 2 E 2 | 10 6 18 |
| 85 | * 3 D 4 | 11 5 20 |
| 86 | * 4 C 6 | 12 4 22 |
| 87 | * 5 B 8 | 13 3 24 |
| 88 | * 6 A 10 | 14 2 26 |
| 89 | * 7 9 12 | 15 1 28 |
| 90 | * 8 8 14 | 16 0 30 |
| 91 | * |
| 92 | */ |
| 93 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | #define WDT_STOP 0x441 |
| 95 | #define WDT_START 0x443 |
| 96 | |
| 97 | /* Default timeout */ |
Wim Van Sebroeck | 794db26 | 2008-10-15 11:44:40 +0000 | [diff] [blame] | 98 | #define WATCHDOG_TIMEOUT 30 /* 30 seconds +/- 20% */ |
| 99 | static int timeout = WATCHDOG_TIMEOUT; /* in seconds */ |
| 100 | module_param(timeout, int, 0); |
| 101 | MODULE_PARM_DESC(timeout, |
| 102 | "Watchdog timeout in seconds. 0<= timeout <=30, default=" |
| 103 | __MODULE_STRING(WATCHDOG_TIMEOUT) "."); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
Andrey Panin | 4bfdf37 | 2005-07-27 11:43:58 -0700 | [diff] [blame] | 105 | static int nowayout = WATCHDOG_NOWAYOUT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | module_param(nowayout, int, 0); |
Alan Cox | 2e43ba7 | 2008-05-19 14:05:52 +0100 | [diff] [blame] | 107 | MODULE_PARM_DESC(nowayout, |
| 108 | "Watchdog cannot be stopped once started (default=" |
| 109 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
| 111 | |
| 112 | /* |
Wim Van Sebroeck | 35d55c9 | 2007-01-27 21:50:53 +0100 | [diff] [blame] | 113 | * Watchdog Operations |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | */ |
| 115 | |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 116 | static void ibwdt_ping(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | { |
Wim Van Sebroeck | 794db26 | 2008-10-15 11:44:40 +0000 | [diff] [blame] | 118 | int wd_margin = 15 - ((timeout + 1) / 2); |
| 119 | |
Wim Van Sebroeck | e42162a | 2007-01-27 22:12:54 +0100 | [diff] [blame] | 120 | spin_lock(&ibwdt_lock); |
| 121 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | /* Write a watchdog value */ |
| 123 | outb_p(wd_margin, WDT_START); |
Wim Van Sebroeck | e42162a | 2007-01-27 22:12:54 +0100 | [diff] [blame] | 124 | |
| 125 | spin_unlock(&ibwdt_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | } |
| 127 | |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 128 | static void ibwdt_disable(void) |
Wim Van Sebroeck | 35d55c9 | 2007-01-27 21:50:53 +0100 | [diff] [blame] | 129 | { |
Wim Van Sebroeck | e42162a | 2007-01-27 22:12:54 +0100 | [diff] [blame] | 130 | spin_lock(&ibwdt_lock); |
Wim Van Sebroeck | 35d55c9 | 2007-01-27 21:50:53 +0100 | [diff] [blame] | 131 | outb_p(0, WDT_STOP); |
Wim Van Sebroeck | e42162a | 2007-01-27 22:12:54 +0100 | [diff] [blame] | 132 | spin_unlock(&ibwdt_lock); |
Wim Van Sebroeck | 35d55c9 | 2007-01-27 21:50:53 +0100 | [diff] [blame] | 133 | } |
| 134 | |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 135 | static int ibwdt_set_heartbeat(int t) |
Wim Van Sebroeck | 35d55c9 | 2007-01-27 21:50:53 +0100 | [diff] [blame] | 136 | { |
Wim Van Sebroeck | 794db26 | 2008-10-15 11:44:40 +0000 | [diff] [blame] | 137 | if (t < 0 || t > 30) |
Wim Van Sebroeck | 35d55c9 | 2007-01-27 21:50:53 +0100 | [diff] [blame] | 138 | return -EINVAL; |
| 139 | |
Wim Van Sebroeck | 794db26 | 2008-10-15 11:44:40 +0000 | [diff] [blame] | 140 | timeout = t; |
Wim Van Sebroeck | 35d55c9 | 2007-01-27 21:50:53 +0100 | [diff] [blame] | 141 | return 0; |
| 142 | } |
| 143 | |
| 144 | /* |
| 145 | * /dev/watchdog handling |
| 146 | */ |
| 147 | |
Alan Cox | 2e43ba7 | 2008-05-19 14:05:52 +0100 | [diff] [blame] | 148 | static ssize_t ibwdt_write(struct file *file, const char __user *buf, |
| 149 | size_t count, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | { |
| 151 | if (count) { |
| 152 | if (!nowayout) { |
| 153 | size_t i; |
| 154 | |
| 155 | /* In case it was set long ago */ |
| 156 | expect_close = 0; |
| 157 | |
| 158 | for (i = 0; i != count; i++) { |
| 159 | char c; |
| 160 | if (get_user(c, buf + i)) |
| 161 | return -EFAULT; |
| 162 | if (c == 'V') |
| 163 | expect_close = 42; |
| 164 | } |
| 165 | } |
| 166 | ibwdt_ping(); |
| 167 | } |
| 168 | return count; |
| 169 | } |
| 170 | |
Alan Cox | 2e43ba7 | 2008-05-19 14:05:52 +0100 | [diff] [blame] | 171 | static long ibwdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | { |
Wim Van Sebroeck | 35d55c9 | 2007-01-27 21:50:53 +0100 | [diff] [blame] | 173 | int new_margin; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | void __user *argp = (void __user *)arg; |
| 175 | int __user *p = argp; |
| 176 | |
| 177 | static struct watchdog_info ident = { |
Alan Cox | 2e43ba7 | 2008-05-19 14:05:52 +0100 | [diff] [blame] | 178 | .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
| 179 | | WDIOF_MAGICCLOSE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | .firmware_version = 1, |
| 181 | .identity = "IB700 WDT", |
| 182 | }; |
| 183 | |
| 184 | switch (cmd) { |
| 185 | case WDIOC_GETSUPPORT: |
Alan Cox | 2e43ba7 | 2008-05-19 14:05:52 +0100 | [diff] [blame] | 186 | if (copy_to_user(argp, &ident, sizeof(ident))) |
| 187 | return -EFAULT; |
| 188 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | |
| 190 | case WDIOC_GETSTATUS: |
Wim Van Sebroeck | c9d7710 | 2007-01-27 22:07:03 +0100 | [diff] [blame] | 191 | case WDIOC_GETBOOTSTATUS: |
Alan Cox | 2e43ba7 | 2008-05-19 14:05:52 +0100 | [diff] [blame] | 192 | return put_user(0, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | |
Wim Van Sebroeck | e42162a | 2007-01-27 22:12:54 +0100 | [diff] [blame] | 194 | case WDIOC_SETOPTIONS: |
| 195 | { |
Alan Cox | 2e43ba7 | 2008-05-19 14:05:52 +0100 | [diff] [blame] | 196 | int options, retval = -EINVAL; |
Wim Van Sebroeck | e42162a | 2007-01-27 22:12:54 +0100 | [diff] [blame] | 197 | |
Alan Cox | 2e43ba7 | 2008-05-19 14:05:52 +0100 | [diff] [blame] | 198 | if (get_user(options, p)) |
| 199 | return -EFAULT; |
Wim Van Sebroeck | e42162a | 2007-01-27 22:12:54 +0100 | [diff] [blame] | 200 | |
Alan Cox | 2e43ba7 | 2008-05-19 14:05:52 +0100 | [diff] [blame] | 201 | if (options & WDIOS_DISABLECARD) { |
| 202 | ibwdt_disable(); |
| 203 | retval = 0; |
| 204 | } |
| 205 | if (options & WDIOS_ENABLECARD) { |
| 206 | ibwdt_ping(); |
| 207 | retval = 0; |
| 208 | } |
| 209 | return retval; |
Wim Van Sebroeck | e42162a | 2007-01-27 22:12:54 +0100 | [diff] [blame] | 210 | } |
Wim Van Sebroeck | 0c06090 | 2008-07-18 11:41:17 +0000 | [diff] [blame] | 211 | case WDIOC_KEEPALIVE: |
| 212 | ibwdt_ping(); |
| 213 | break; |
| 214 | |
| 215 | case WDIOC_SETTIMEOUT: |
| 216 | if (get_user(new_margin, p)) |
| 217 | return -EFAULT; |
| 218 | if (ibwdt_set_heartbeat(new_margin)) |
| 219 | return -EINVAL; |
| 220 | ibwdt_ping(); |
| 221 | /* Fall */ |
| 222 | |
| 223 | case WDIOC_GETTIMEOUT: |
Wim Van Sebroeck | 794db26 | 2008-10-15 11:44:40 +0000 | [diff] [blame] | 224 | return put_user(timeout, p); |
Wim Van Sebroeck | 0c06090 | 2008-07-18 11:41:17 +0000 | [diff] [blame] | 225 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | default: |
Alan Cox | 2e43ba7 | 2008-05-19 14:05:52 +0100 | [diff] [blame] | 227 | return -ENOTTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | } |
| 229 | return 0; |
| 230 | } |
| 231 | |
Alan Cox | 2e43ba7 | 2008-05-19 14:05:52 +0100 | [diff] [blame] | 232 | static int ibwdt_open(struct inode *inode, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | { |
Alan Cox | 2e43ba7 | 2008-05-19 14:05:52 +0100 | [diff] [blame] | 234 | if (test_and_set_bit(0, &ibwdt_is_open)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | return -EBUSY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | if (nowayout) |
| 237 | __module_get(THIS_MODULE); |
| 238 | |
| 239 | /* Activate */ |
| 240 | ibwdt_ping(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | return nonseekable_open(inode, file); |
| 242 | } |
| 243 | |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 244 | static int ibwdt_close(struct inode *inode, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | { |
Wim Van Sebroeck | c9d7710 | 2007-01-27 22:07:03 +0100 | [diff] [blame] | 246 | if (expect_close == 42) { |
Wim Van Sebroeck | 35d55c9 | 2007-01-27 21:50:53 +0100 | [diff] [blame] | 247 | ibwdt_disable(); |
Wim Van Sebroeck | c9d7710 | 2007-01-27 22:07:03 +0100 | [diff] [blame] | 248 | } else { |
Alan Cox | 2e43ba7 | 2008-05-19 14:05:52 +0100 | [diff] [blame] | 249 | printk(KERN_CRIT PFX |
| 250 | "WDT device closed unexpectedly. WDT will not stop!\n"); |
Wim Van Sebroeck | c9d7710 | 2007-01-27 22:07:03 +0100 | [diff] [blame] | 251 | ibwdt_ping(); |
| 252 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | clear_bit(0, &ibwdt_is_open); |
| 254 | expect_close = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | return 0; |
| 256 | } |
| 257 | |
| 258 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | * Kernel Interfaces |
| 260 | */ |
| 261 | |
Arjan van de Ven | 62322d2 | 2006-07-03 00:24:21 -0700 | [diff] [blame] | 262 | static const struct file_operations ibwdt_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | .owner = THIS_MODULE, |
| 264 | .llseek = no_llseek, |
| 265 | .write = ibwdt_write, |
Alan Cox | 2e43ba7 | 2008-05-19 14:05:52 +0100 | [diff] [blame] | 266 | .unlocked_ioctl = ibwdt_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | .open = ibwdt_open, |
| 268 | .release = ibwdt_close, |
| 269 | }; |
| 270 | |
| 271 | static struct miscdevice ibwdt_miscdev = { |
| 272 | .minor = WATCHDOG_MINOR, |
| 273 | .name = "watchdog", |
| 274 | .fops = &ibwdt_fops, |
| 275 | }; |
| 276 | |
| 277 | /* |
Wim Van Sebroeck | f6e4803 | 2007-01-27 21:58:08 +0100 | [diff] [blame] | 278 | * Init & exit routines |
| 279 | */ |
| 280 | |
Wim Van Sebroeck | 745ac1ea | 2007-01-27 22:39:46 +0100 | [diff] [blame] | 281 | static int __devinit ibwdt_probe(struct platform_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | { |
| 283 | int res; |
| 284 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | #if WDT_START != WDT_STOP |
| 286 | if (!request_region(WDT_STOP, 1, "IB700 WDT")) { |
Alan Cox | 2e43ba7 | 2008-05-19 14:05:52 +0100 | [diff] [blame] | 287 | printk(KERN_ERR PFX "STOP method I/O %X is not available.\n", |
| 288 | WDT_STOP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | res = -EIO; |
| 290 | goto out_nostopreg; |
| 291 | } |
| 292 | #endif |
| 293 | |
| 294 | if (!request_region(WDT_START, 1, "IB700 WDT")) { |
Alan Cox | 2e43ba7 | 2008-05-19 14:05:52 +0100 | [diff] [blame] | 295 | printk(KERN_ERR PFX "START method I/O %X is not available.\n", |
| 296 | WDT_START); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | res = -EIO; |
| 298 | goto out_nostartreg; |
| 299 | } |
Wim Van Sebroeck | f6e4803 | 2007-01-27 21:58:08 +0100 | [diff] [blame] | 300 | |
Wim Van Sebroeck | 794db26 | 2008-10-15 11:44:40 +0000 | [diff] [blame] | 301 | /* Check that the heartbeat value is within it's range ; |
| 302 | * if not reset to the default */ |
| 303 | if (ibwdt_set_heartbeat(timeout)) { |
| 304 | ibwdt_set_heartbeat(WATCHDOG_TIMEOUT); |
| 305 | printk(KERN_INFO PFX |
| 306 | "timeout value must be 0<=x<=30, using %d\n", timeout); |
| 307 | } |
| 308 | |
Wim Van Sebroeck | f6e4803 | 2007-01-27 21:58:08 +0100 | [diff] [blame] | 309 | res = misc_register(&ibwdt_miscdev); |
| 310 | if (res) { |
Alan Cox | 2e43ba7 | 2008-05-19 14:05:52 +0100 | [diff] [blame] | 311 | printk(KERN_ERR PFX "failed to register misc device\n"); |
Wim Van Sebroeck | f6e4803 | 2007-01-27 21:58:08 +0100 | [diff] [blame] | 312 | goto out_nomisc; |
| 313 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | return 0; |
| 315 | |
Wim Van Sebroeck | f6e4803 | 2007-01-27 21:58:08 +0100 | [diff] [blame] | 316 | out_nomisc: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | release_region(WDT_START, 1); |
| 318 | out_nostartreg: |
| 319 | #if WDT_START != WDT_STOP |
| 320 | release_region(WDT_STOP, 1); |
| 321 | #endif |
| 322 | out_nostopreg: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | return res; |
| 324 | } |
| 325 | |
Wim Van Sebroeck | 745ac1ea | 2007-01-27 22:39:46 +0100 | [diff] [blame] | 326 | static int __devexit ibwdt_remove(struct platform_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | { |
| 328 | misc_deregister(&ibwdt_miscdev); |
Alan Cox | 2e43ba7 | 2008-05-19 14:05:52 +0100 | [diff] [blame] | 329 | release_region(WDT_START, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | #if WDT_START != WDT_STOP |
Alan Cox | 2e43ba7 | 2008-05-19 14:05:52 +0100 | [diff] [blame] | 331 | release_region(WDT_STOP, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | #endif |
Wim Van Sebroeck | 745ac1ea | 2007-01-27 22:39:46 +0100 | [diff] [blame] | 333 | return 0; |
| 334 | } |
| 335 | |
Wim Van Sebroeck | 35fcf53 | 2007-01-27 22:54:18 +0100 | [diff] [blame] | 336 | static void ibwdt_shutdown(struct platform_device *dev) |
| 337 | { |
| 338 | /* Turn the WDT off if we have a soft shutdown */ |
| 339 | ibwdt_disable(); |
| 340 | } |
| 341 | |
Wim Van Sebroeck | 745ac1ea | 2007-01-27 22:39:46 +0100 | [diff] [blame] | 342 | static struct platform_driver ibwdt_driver = { |
| 343 | .probe = ibwdt_probe, |
| 344 | .remove = __devexit_p(ibwdt_remove), |
Wim Van Sebroeck | 35fcf53 | 2007-01-27 22:54:18 +0100 | [diff] [blame] | 345 | .shutdown = ibwdt_shutdown, |
Wim Van Sebroeck | 745ac1ea | 2007-01-27 22:39:46 +0100 | [diff] [blame] | 346 | .driver = { |
| 347 | .owner = THIS_MODULE, |
| 348 | .name = DRV_NAME, |
| 349 | }, |
| 350 | }; |
| 351 | |
| 352 | static int __init ibwdt_init(void) |
| 353 | { |
| 354 | int err; |
| 355 | |
Alan Cox | 2e43ba7 | 2008-05-19 14:05:52 +0100 | [diff] [blame] | 356 | printk(KERN_INFO PFX |
| 357 | "WDT driver for IB700 single board computer initialising.\n"); |
Wim Van Sebroeck | 745ac1ea | 2007-01-27 22:39:46 +0100 | [diff] [blame] | 358 | |
| 359 | err = platform_driver_register(&ibwdt_driver); |
| 360 | if (err) |
| 361 | return err; |
| 362 | |
Alan Cox | 2e43ba7 | 2008-05-19 14:05:52 +0100 | [diff] [blame] | 363 | ibwdt_platform_device = platform_device_register_simple(DRV_NAME, |
| 364 | -1, NULL, 0); |
Wim Van Sebroeck | 745ac1ea | 2007-01-27 22:39:46 +0100 | [diff] [blame] | 365 | if (IS_ERR(ibwdt_platform_device)) { |
| 366 | err = PTR_ERR(ibwdt_platform_device); |
| 367 | goto unreg_platform_driver; |
| 368 | } |
| 369 | |
| 370 | return 0; |
| 371 | |
| 372 | unreg_platform_driver: |
| 373 | platform_driver_unregister(&ibwdt_driver); |
| 374 | return err; |
| 375 | } |
| 376 | |
| 377 | static void __exit ibwdt_exit(void) |
| 378 | { |
| 379 | platform_device_unregister(ibwdt_platform_device); |
| 380 | platform_driver_unregister(&ibwdt_driver); |
| 381 | printk(KERN_INFO PFX "Watchdog Module Unloaded.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | } |
| 383 | |
| 384 | module_init(ibwdt_init); |
| 385 | module_exit(ibwdt_exit); |
| 386 | |
| 387 | MODULE_AUTHOR("Charles Howes <chowes@vsol.net>"); |
| 388 | MODULE_DESCRIPTION("IB700 SBC watchdog driver"); |
| 389 | MODULE_LICENSE("GPL"); |
| 390 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |
| 391 | |
| 392 | /* end of ib700wdt.c */ |