w83627hf_wdt.c revision 28dd1b0b9191ac9cd0b96fa4d09d951498bfbadb
11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 20e94f2ee0d1947ba6c2c00c3e971ff93ce8edec1Vlad Drukker * w83627hf/thf WDT driver 30e94f2ee0d1947ba6c2c00c3e971ff93ce8edec1Vlad Drukker * 40e94f2ee0d1947ba6c2c00c3e971ff93ce8edec1Vlad Drukker * (c) Copyright 2007 Vlad Drukker <vlad@storewiz.com> 50e94f2ee0d1947ba6c2c00c3e971ff93ce8edec1Vlad Drukker * added support for W83627THF. 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 728dd1b0b9191ac9cd0b96fa4d09d951498bfbadbP�draig Brady * (c) Copyright 2003,2007 P�draig Brady <P@draigBrady.com> 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Based on advantechwdt.c which is based on wdt.c. 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Original copyright messages: 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl> 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved. 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * http://www.redhat.com 161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This program is free software; you can redistribute it and/or 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * modify it under the terms of the GNU General Public License 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * as published by the Free Software Foundation; either version 201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2 of the License, or (at your option) any later version. 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * warranty for any of this software. This material is provided 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * "AS-IS" and at no charge. 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * (c) Copyright 1995 Alan Cox <alan@redhat.com> 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/module.h> 301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/moduleparam.h> 311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/types.h> 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/miscdevice.h> 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/watchdog.h> 341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/fs.h> 351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/ioport.h> 361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/notifier.h> 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/reboot.h> 381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/init.h> 39ab9d441425559aa035ba6327f21e8922e8a13927Wim Van Sebroeck#include <linux/spinlock.h> 401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/io.h> 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/uaccess.h> 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/system.h> 441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4528dd1b0b9191ac9cd0b96fa4d09d951498bfbadbP�draig Brady#define WATCHDOG_NAME "w83627hf/thf/hg WDT" 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define PFX WATCHDOG_NAME ": " 471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */ 481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic unsigned long wdt_is_open; 501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic char expect_close; 51ab9d441425559aa035ba6327f21e8922e8a13927Wim Van Sebroeckstatic spinlock_t io_lock; 521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* You must set this - there is no sane way to probe for this board. */ 541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int wdt_io = 0x2E; 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_param(wdt_io, int, 0); 560e94f2ee0d1947ba6c2c00c3e971ff93ce8edec1Vlad DrukkerMODULE_PARM_DESC(wdt_io, "w83627hf/thf WDT io port (default 0x2E)"); 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int timeout = WATCHDOG_TIMEOUT; /* in seconds */ 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_param(timeout, int, 0); 6028dd1b0b9191ac9cd0b96fa4d09d951498bfbadbP�draig BradyMODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. 1<= timeout <=255, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) "."); 611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 624bfdf37830111321e2cd1fe0102dd776ce93194dAndrey Paninstatic int nowayout = WATCHDOG_NOWAYOUT; 631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_param(nowayout, int, 0); 64bffda5c87cf60d27a27f2e862c82c474f8e89767Wim Van SebroeckMODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); 651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Kernel methods. 681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define WDT_EFER (wdt_io+0) /* Extended Function Enable Registers */ 711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define WDT_EFIR (wdt_io+0) /* Extended Function Index Register (same as EFER) */ 721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define WDT_EFDR (WDT_EFIR+1) /* Extended Function Data Register */ 731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void 751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsw83627hf_select_wd_register(void) 761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 770e94f2ee0d1947ba6c2c00c3e971ff93ce8edec1Vlad Drukker unsigned char c; 781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds outb_p(0x87, WDT_EFER); /* Enter extended function mode */ 791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds outb_p(0x87, WDT_EFER); /* Again according to manual */ 801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8128dd1b0b9191ac9cd0b96fa4d09d951498bfbadbP�draig Brady outb(0x20, WDT_EFER); /* check chip version */ 820e94f2ee0d1947ba6c2c00c3e971ff93ce8edec1Vlad Drukker c = inb(WDT_EFDR); 8328dd1b0b9191ac9cd0b96fa4d09d951498bfbadbP�draig Brady if (c == 0x82) { /* W83627THF */ 840e94f2ee0d1947ba6c2c00c3e971ff93ce8edec1Vlad Drukker outb_p(0x2b, WDT_EFER); /* select GPIO3 */ 850e94f2ee0d1947ba6c2c00c3e971ff93ce8edec1Vlad Drukker c = ((inb_p(WDT_EFDR) & 0xf7) | 0x04); /* select WDT0 */ 860e94f2ee0d1947ba6c2c00c3e971ff93ce8edec1Vlad Drukker outb_p(0x2b, WDT_EFER); 870e94f2ee0d1947ba6c2c00c3e971ff93ce8edec1Vlad Drukker outb_p(c, WDT_EFDR); /* set GPIO3 to WDT0 */ 880e94f2ee0d1947ba6c2c00c3e971ff93ce8edec1Vlad Drukker } 890e94f2ee0d1947ba6c2c00c3e971ff93ce8edec1Vlad Drukker 901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds outb_p(0x07, WDT_EFER); /* point to logical device number reg */ 911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds outb_p(0x08, WDT_EFDR); /* select logical device 8 (GPIO2) */ 921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds outb_p(0x30, WDT_EFER); /* select CR30 */ 931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds outb_p(0x01, WDT_EFDR); /* set bit 0 to activate GPIO2 */ 941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void 971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsw83627hf_unselect_wd_register(void) 981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds outb_p(0xAA, WDT_EFER); /* Leave extended function mode */ 1001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* tyan motherboards seem to set F5 to 0x4C ? 1031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * So explicitly init to appropriate value. */ 1041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void 1051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsw83627hf_init(void) 1061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char t; 1081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds w83627hf_select_wd_register(); 1101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11193642ecd463df30d032da8ac37c2676cee4ad876P@Draig Brady outb_p(0xF6, WDT_EFER); /* Select CRF6 */ 11293642ecd463df30d032da8ac37c2676cee4ad876P@Draig Brady t=inb_p(WDT_EFDR); /* read CRF6 */ 11393642ecd463df30d032da8ac37c2676cee4ad876P@Draig Brady if (t != 0) { 11493642ecd463df30d032da8ac37c2676cee4ad876P@Draig Brady printk (KERN_INFO PFX "Watchdog already running. Resetting timeout to %d sec\n", timeout); 11593642ecd463df30d032da8ac37c2676cee4ad876P@Draig Brady outb_p(timeout, WDT_EFDR); /* Write back to CRF6 */ 11693642ecd463df30d032da8ac37c2676cee4ad876P@Draig Brady } 11728dd1b0b9191ac9cd0b96fa4d09d951498bfbadbP�draig Brady 1181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds outb_p(0xF5, WDT_EFER); /* Select CRF5 */ 1191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds t=inb_p(WDT_EFDR); /* read CRF5 */ 1201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds t&=~0x0C; /* set second mode & disable keyboard turning off watchdog */ 1211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds outb_p(t, WDT_EFDR); /* Write back to CRF5 */ 1221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12328dd1b0b9191ac9cd0b96fa4d09d951498bfbadbP�draig Brady outb_p(0xF7, WDT_EFER); /* Select CRF7 */ 12428dd1b0b9191ac9cd0b96fa4d09d951498bfbadbP�draig Brady t=inb_p(WDT_EFDR); /* read CRF7 */ 12528dd1b0b9191ac9cd0b96fa4d09d951498bfbadbP�draig Brady t&=~0xC0; /* disable keyboard & mouse turning off watchdog */ 12628dd1b0b9191ac9cd0b96fa4d09d951498bfbadbP�draig Brady outb_p(t, WDT_EFDR); /* Write back to CRF7 */ 12728dd1b0b9191ac9cd0b96fa4d09d951498bfbadbP�draig Brady 1281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds w83627hf_unselect_wd_register(); 1291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void 1321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswdt_ctrl(int timeout) 1331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 134ab9d441425559aa035ba6327f21e8922e8a13927Wim Van Sebroeck spin_lock(&io_lock); 13528dd1b0b9191ac9cd0b96fa4d09d951498bfbadbP�draig Brady 1361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds w83627hf_select_wd_register(); 1371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds outb_p(0xF6, WDT_EFER); /* Select CRF6 */ 1391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds outb_p(timeout, WDT_EFDR); /* Write Timeout counter to CRF6 */ 1401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds w83627hf_unselect_wd_register(); 142ab9d441425559aa035ba6327f21e8922e8a13927Wim Van Sebroeck 143ab9d441425559aa035ba6327f21e8922e8a13927Wim Van Sebroeck spin_unlock(&io_lock); 1441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int 1471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswdt_ping(void) 1481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wdt_ctrl(timeout); 1501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 1511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int 1541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswdt_disable(void) 1551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wdt_ctrl(0); 1571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 1581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int 1611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswdt_set_heartbeat(int t) 1621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 16328dd1b0b9191ac9cd0b96fa4d09d951498bfbadbP�draig Brady if ((t < 1) || (t > 255)) 1641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 1651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds timeout = t; 1671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 1681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic ssize_t 1711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) 1721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (count) { 1741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!nowayout) { 1751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t i; 1761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds expect_close = 0; 1781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i != count; i++) { 1801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds char c; 1811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (get_user(c, buf+i)) 1821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EFAULT; 1831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (c == 'V') 1841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds expect_close = 42; 1851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wdt_ping(); 1881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return count; 1901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int 1931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, 1941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long arg) 1951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds void __user *argp = (void __user *)arg; 1971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int __user *p = argp; 1981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int new_timeout; 1991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds static struct watchdog_info ident = { 2001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, 2011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .firmware_version = 1, 2021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .identity = "W83627HF WDT", 2031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds }; 2041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds switch (cmd) { 2061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case WDIOC_GETSUPPORT: 2071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy_to_user(argp, &ident, sizeof(ident))) 2081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EFAULT; 2091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 2101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case WDIOC_GETSTATUS: 2121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case WDIOC_GETBOOTSTATUS: 2131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return put_user(0, p); 2141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case WDIOC_KEEPALIVE: 2161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wdt_ping(); 2171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 2181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case WDIOC_SETTIMEOUT: 2201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (get_user(new_timeout, p)) 2211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EFAULT; 2221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (wdt_set_heartbeat(new_timeout)) 2231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 2241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wdt_ping(); 2251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Fall */ 2261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case WDIOC_GETTIMEOUT: 2281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return put_user(timeout, p); 2291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case WDIOC_SETOPTIONS: 2311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds { 2321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int options, retval = -EINVAL; 2331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (get_user(options, p)) 2351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EFAULT; 2361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (options & WDIOS_DISABLECARD) { 2381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wdt_disable(); 2391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds retval = 0; 2401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (options & WDIOS_ENABLECARD) { 2431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wdt_ping(); 2441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds retval = 0; 2451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return retval; 2481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds default: 251795b89d207d8ff5397f9ff1f4d44662aa7c821fcSamuel Tardieu return -ENOTTY; 2521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 2541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int 2571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswdt_open(struct inode *inode, struct file *file) 2581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (test_and_set_bit(0, &wdt_is_open)) 2601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EBUSY; 2611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 2621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Activate 2631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wdt_ping(); 2661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return nonseekable_open(inode, file); 2671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int 2701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswdt_close(struct inode *inode, struct file *file) 2711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (expect_close == 42) { 2731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wdt_disable(); 2741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 2751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); 2761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wdt_ping(); 2771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds expect_close = 0; 2791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds clear_bit(0, &wdt_is_open); 2801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 2811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 2841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Notifier for system down 2851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int 2881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswdt_notify_sys(struct notifier_block *this, unsigned long code, 2891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds void *unused) 2901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (code == SYS_DOWN || code == SYS_HALT) { 2921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Turn the WDT off */ 2931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wdt_disable(); 2941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NOTIFY_DONE; 2961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 2991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Kernel Interfaces 3001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 30262322d2554d2f9680c8ace7bbf1f97d8fa84ad1aArjan van de Venstatic const struct file_operations wdt_fops = { 3031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .owner = THIS_MODULE, 3041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .llseek = no_llseek, 3051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .write = wdt_write, 3061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .ioctl = wdt_ioctl, 3071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .open = wdt_open, 3081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .release = wdt_close, 3091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 3101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct miscdevice wdt_miscdev = { 3121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .minor = WATCHDOG_MINOR, 3131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .name = "watchdog", 3141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .fops = &wdt_fops, 3151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 3161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 3181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The WDT needs to learn about soft shutdowns in order to 3191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * turn the timebomb registers off. 3201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct notifier_block wdt_notifier = { 3231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .notifier_call = wdt_notify_sys, 3241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 3251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int __init 3271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswdt_init(void) 3281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int ret; 3301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 331ab9d441425559aa035ba6327f21e8922e8a13927Wim Van Sebroeck spin_lock_init(&io_lock); 332ab9d441425559aa035ba6327f21e8922e8a13927Wim Van Sebroeck 33328dd1b0b9191ac9cd0b96fa4d09d951498bfbadbP�draig Brady printk(KERN_INFO "WDT driver for the Winbond(TM) W83627HF/THF/HG Super I/O chip initialising.\n"); 3341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (wdt_set_heartbeat(timeout)) { 3361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wdt_set_heartbeat(WATCHDOG_TIMEOUT); 33728dd1b0b9191ac9cd0b96fa4d09d951498bfbadbP�draig Brady printk (KERN_INFO PFX "timeout value must be 1<=timeout<=255, using %d\n", 3381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds WATCHDOG_TIMEOUT); 3391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!request_region(wdt_io, 1, WATCHDOG_NAME)) { 3421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk (KERN_ERR PFX "I/O address 0x%04x already in use\n", 3431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wdt_io); 3441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = -EIO; 3451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 3461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds w83627hf_init(); 3491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = register_reboot_notifier(&wdt_notifier); 3511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ret != 0) { 3521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", 3531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret); 3541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto unreg_regions; 3551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = misc_register(&wdt_miscdev); 3581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ret != 0) { 3591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", 3601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds WATCHDOG_MINOR, ret); 3611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto unreg_reboot; 3621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk (KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n", 3651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds timeout, nowayout); 3661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsout: 3681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return ret; 3691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsunreg_reboot: 3701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unregister_reboot_notifier(&wdt_notifier); 3711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsunreg_regions: 3721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds release_region(wdt_io, 1); 3731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 3741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void __exit 3771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswdt_exit(void) 3781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds misc_deregister(&wdt_miscdev); 3801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unregister_reboot_notifier(&wdt_notifier); 3811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds release_region(wdt_io,1); 3821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_init(wdt_init); 3851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_exit(wdt_exit); 3861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_LICENSE("GPL"); 3881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_AUTHOR("P�draig Brady <P@draigBrady.com>"); 3890e94f2ee0d1947ba6c2c00c3e971ff93ce8edec1Vlad DrukkerMODULE_DESCRIPTION("w83627hf/thf WDT driver"); 3901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); 391