1b7e04f8cSWim Van Sebroeck /* 2b7e04f8cSWim Van Sebroeck * Industrial Computer Source WDT500/501 driver 3b7e04f8cSWim Van Sebroeck * 4b7e04f8cSWim Van Sebroeck * (c) Copyright 1996-1997 Alan Cox <alan@redhat.com>, All Rights Reserved. 5b7e04f8cSWim Van Sebroeck * http://www.redhat.com 6b7e04f8cSWim Van Sebroeck * 7b7e04f8cSWim Van Sebroeck * This program is free software; you can redistribute it and/or 8b7e04f8cSWim Van Sebroeck * modify it under the terms of the GNU General Public License 9b7e04f8cSWim Van Sebroeck * as published by the Free Software Foundation; either version 10b7e04f8cSWim Van Sebroeck * 2 of the License, or (at your option) any later version. 11b7e04f8cSWim Van Sebroeck * 12b7e04f8cSWim Van Sebroeck * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide 13b7e04f8cSWim Van Sebroeck * warranty for any of this software. This material is provided 14b7e04f8cSWim Van Sebroeck * "AS-IS" and at no charge. 15b7e04f8cSWim Van Sebroeck * 16b7e04f8cSWim Van Sebroeck * (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk> 17b7e04f8cSWim Van Sebroeck * 18b7e04f8cSWim Van Sebroeck * Release 0.10. 19b7e04f8cSWim Van Sebroeck * 20b7e04f8cSWim Van Sebroeck * Fixes 21b7e04f8cSWim Van Sebroeck * Dave Gregorich : Modularisation and minor bugs 22b7e04f8cSWim Van Sebroeck * Alan Cox : Added the watchdog ioctl() stuff 23b7e04f8cSWim Van Sebroeck * Alan Cox : Fixed the reboot problem (as noted by 24b7e04f8cSWim Van Sebroeck * Matt Crocker). 25b7e04f8cSWim Van Sebroeck * Alan Cox : Added wdt= boot option 26b7e04f8cSWim Van Sebroeck * Alan Cox : Cleaned up copy/user stuff 27b7e04f8cSWim Van Sebroeck * Tim Hockin : Added insmod parameters, comment cleanup 28b7e04f8cSWim Van Sebroeck * Parameterized timeout 29b7e04f8cSWim Van Sebroeck * Tigran Aivazian : Restructured wdt_init() to handle failures 30b7e04f8cSWim Van Sebroeck * Joel Becker : Added WDIOC_GET/SETTIMEOUT 31b7e04f8cSWim Van Sebroeck * Matt Domsch : Added nowayout module option 32b7e04f8cSWim Van Sebroeck */ 33b7e04f8cSWim Van Sebroeck 34b7e04f8cSWim Van Sebroeck #include <linux/interrupt.h> 35b7e04f8cSWim Van Sebroeck #include <linux/module.h> 36b7e04f8cSWim Van Sebroeck #include <linux/moduleparam.h> 37b7e04f8cSWim Van Sebroeck #include <linux/types.h> 38b7e04f8cSWim Van Sebroeck #include <linux/miscdevice.h> 39b7e04f8cSWim Van Sebroeck #include <linux/watchdog.h> 40b7e04f8cSWim Van Sebroeck #include <linux/fs.h> 41b7e04f8cSWim Van Sebroeck #include <linux/ioport.h> 42b7e04f8cSWim Van Sebroeck #include <linux/notifier.h> 43b7e04f8cSWim Van Sebroeck #include <linux/reboot.h> 44b7e04f8cSWim Van Sebroeck #include <linux/init.h> 45b7e04f8cSWim Van Sebroeck 46b7e04f8cSWim Van Sebroeck #include <asm/io.h> 47b7e04f8cSWim Van Sebroeck #include <asm/uaccess.h> 48b7e04f8cSWim Van Sebroeck #include <asm/system.h> 49b7e04f8cSWim Van Sebroeck #include "wd501p.h" 50b7e04f8cSWim Van Sebroeck 51b7e04f8cSWim Van Sebroeck static unsigned long wdt_is_open; 52b7e04f8cSWim Van Sebroeck static char expect_close; 53b7e04f8cSWim Van Sebroeck 54b7e04f8cSWim Van Sebroeck /* 55b7e04f8cSWim Van Sebroeck * Module parameters 56b7e04f8cSWim Van Sebroeck */ 57b7e04f8cSWim Van Sebroeck 58b7e04f8cSWim Van Sebroeck #define WD_TIMO 60 /* Default heartbeat = 60 seconds */ 59b7e04f8cSWim Van Sebroeck 60b7e04f8cSWim Van Sebroeck static int heartbeat = WD_TIMO; 61b7e04f8cSWim Van Sebroeck static int wd_heartbeat; 62b7e04f8cSWim Van Sebroeck module_param(heartbeat, int, 0); 63b7e04f8cSWim Van Sebroeck MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WD_TIMO) ")"); 64b7e04f8cSWim Van Sebroeck 65b7e04f8cSWim Van Sebroeck static int nowayout = WATCHDOG_NOWAYOUT; 66b7e04f8cSWim Van Sebroeck module_param(nowayout, int, 0); 67b7e04f8cSWim Van Sebroeck MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); 68b7e04f8cSWim Van Sebroeck 69b7e04f8cSWim Van Sebroeck /* You must set these - there is no sane way to probe for this board. */ 70b7e04f8cSWim Van Sebroeck static int io=0x240; 71b7e04f8cSWim Van Sebroeck static int irq=11; 72b7e04f8cSWim Van Sebroeck 73*01c785dcSAlan Cox static DEFINE_SPINLOCK(wdt_lock); 74*01c785dcSAlan Cox 75b7e04f8cSWim Van Sebroeck module_param(io, int, 0); 76b7e04f8cSWim Van Sebroeck MODULE_PARM_DESC(io, "WDT io port (default=0x240)"); 77b7e04f8cSWim Van Sebroeck module_param(irq, int, 0); 78b7e04f8cSWim Van Sebroeck MODULE_PARM_DESC(irq, "WDT irq (default=11)"); 79b7e04f8cSWim Van Sebroeck 80b7e04f8cSWim Van Sebroeck #ifdef CONFIG_WDT_501 81b7e04f8cSWim Van Sebroeck /* Support for the Fan Tachometer on the WDT501-P */ 82b7e04f8cSWim Van Sebroeck static int tachometer; 83b7e04f8cSWim Van Sebroeck 84b7e04f8cSWim Van Sebroeck module_param(tachometer, int, 0); 85b7e04f8cSWim Van Sebroeck MODULE_PARM_DESC(tachometer, "WDT501-P Fan Tachometer support (0=disable, default=0)"); 86b7e04f8cSWim Van Sebroeck #endif /* CONFIG_WDT_501 */ 87b7e04f8cSWim Van Sebroeck 88b7e04f8cSWim Van Sebroeck /* 89b7e04f8cSWim Van Sebroeck * Programming support 90b7e04f8cSWim Van Sebroeck */ 91b7e04f8cSWim Van Sebroeck 92b7e04f8cSWim Van Sebroeck static void wdt_ctr_mode(int ctr, int mode) 93b7e04f8cSWim Van Sebroeck { 94b7e04f8cSWim Van Sebroeck ctr<<=6; 95b7e04f8cSWim Van Sebroeck ctr|=0x30; 96b7e04f8cSWim Van Sebroeck ctr|=(mode<<1); 97b7e04f8cSWim Van Sebroeck outb_p(ctr, WDT_CR); 98b7e04f8cSWim Van Sebroeck } 99b7e04f8cSWim Van Sebroeck 100b7e04f8cSWim Van Sebroeck static void wdt_ctr_load(int ctr, int val) 101b7e04f8cSWim Van Sebroeck { 102b7e04f8cSWim Van Sebroeck outb_p(val&0xFF, WDT_COUNT0+ctr); 103b7e04f8cSWim Van Sebroeck outb_p(val>>8, WDT_COUNT0+ctr); 104b7e04f8cSWim Van Sebroeck } 105b7e04f8cSWim Van Sebroeck 106b7e04f8cSWim Van Sebroeck /** 107b7e04f8cSWim Van Sebroeck * wdt_start: 108b7e04f8cSWim Van Sebroeck * 109b7e04f8cSWim Van Sebroeck * Start the watchdog driver. 110b7e04f8cSWim Van Sebroeck */ 111b7e04f8cSWim Van Sebroeck 112b7e04f8cSWim Van Sebroeck static int wdt_start(void) 113b7e04f8cSWim Van Sebroeck { 114*01c785dcSAlan Cox unsigned long flags; 115*01c785dcSAlan Cox spin_lock_irqsave(&wdt_lock, flags); 116b7e04f8cSWim Van Sebroeck inb_p(WDT_DC); /* Disable watchdog */ 117b7e04f8cSWim Van Sebroeck wdt_ctr_mode(0,3); /* Program CTR0 for Mode 3: Square Wave Generator */ 118b7e04f8cSWim Van Sebroeck wdt_ctr_mode(1,2); /* Program CTR1 for Mode 2: Rate Generator */ 119b7e04f8cSWim Van Sebroeck wdt_ctr_mode(2,0); /* Program CTR2 for Mode 0: Pulse on Terminal Count */ 120b7e04f8cSWim Van Sebroeck wdt_ctr_load(0, 8948); /* Count at 100Hz */ 121b7e04f8cSWim Van Sebroeck wdt_ctr_load(1,wd_heartbeat); /* Heartbeat */ 122b7e04f8cSWim Van Sebroeck wdt_ctr_load(2,65535); /* Length of reset pulse */ 123b7e04f8cSWim Van Sebroeck outb_p(0, WDT_DC); /* Enable watchdog */ 124*01c785dcSAlan Cox spin_unlock_irqrestore(&wdt_lock, flags); 125b7e04f8cSWim Van Sebroeck return 0; 126b7e04f8cSWim Van Sebroeck } 127b7e04f8cSWim Van Sebroeck 128b7e04f8cSWim Van Sebroeck /** 129b7e04f8cSWim Van Sebroeck * wdt_stop: 130b7e04f8cSWim Van Sebroeck * 131b7e04f8cSWim Van Sebroeck * Stop the watchdog driver. 132b7e04f8cSWim Van Sebroeck */ 133b7e04f8cSWim Van Sebroeck 134b7e04f8cSWim Van Sebroeck static int wdt_stop (void) 135b7e04f8cSWim Van Sebroeck { 136*01c785dcSAlan Cox unsigned long flags; 137*01c785dcSAlan Cox spin_lock_irqsave(&wdt_lock, flags); 138b7e04f8cSWim Van Sebroeck /* Turn the card off */ 139b7e04f8cSWim Van Sebroeck inb_p(WDT_DC); /* Disable watchdog */ 140b7e04f8cSWim Van Sebroeck wdt_ctr_load(2,0); /* 0 length reset pulses now */ 141*01c785dcSAlan Cox spin_unlock_irqrestore(&wdt_lock, flags); 142b7e04f8cSWim Van Sebroeck return 0; 143b7e04f8cSWim Van Sebroeck } 144b7e04f8cSWim Van Sebroeck 145b7e04f8cSWim Van Sebroeck /** 146b7e04f8cSWim Van Sebroeck * wdt_ping: 147b7e04f8cSWim Van Sebroeck * 148b7e04f8cSWim Van Sebroeck * Reload counter one with the watchdog heartbeat. We don't bother reloading 149b7e04f8cSWim Van Sebroeck * the cascade counter. 150b7e04f8cSWim Van Sebroeck */ 151b7e04f8cSWim Van Sebroeck 152b7e04f8cSWim Van Sebroeck static int wdt_ping(void) 153b7e04f8cSWim Van Sebroeck { 154*01c785dcSAlan Cox unsigned long flags; 155*01c785dcSAlan Cox spin_lock_irqsave(&wdt_lock, flags); 156b7e04f8cSWim Van Sebroeck /* Write a watchdog value */ 157b7e04f8cSWim Van Sebroeck inb_p(WDT_DC); /* Disable watchdog */ 158b7e04f8cSWim Van Sebroeck wdt_ctr_mode(1,2); /* Re-Program CTR1 for Mode 2: Rate Generator */ 159b7e04f8cSWim Van Sebroeck wdt_ctr_load(1,wd_heartbeat); /* Heartbeat */ 160b7e04f8cSWim Van Sebroeck outb_p(0, WDT_DC); /* Enable watchdog */ 161*01c785dcSAlan Cox spin_unlock_irqrestore(&wdt_lock, flags); 162b7e04f8cSWim Van Sebroeck return 0; 163b7e04f8cSWim Van Sebroeck } 164b7e04f8cSWim Van Sebroeck 165b7e04f8cSWim Van Sebroeck /** 166b7e04f8cSWim Van Sebroeck * wdt_set_heartbeat: 167b7e04f8cSWim Van Sebroeck * @t: the new heartbeat value that needs to be set. 168b7e04f8cSWim Van Sebroeck * 169b7e04f8cSWim Van Sebroeck * Set a new heartbeat value for the watchdog device. If the heartbeat value is 170b7e04f8cSWim Van Sebroeck * incorrect we keep the old value and return -EINVAL. If successfull we 171b7e04f8cSWim Van Sebroeck * return 0. 172b7e04f8cSWim Van Sebroeck */ 173b7e04f8cSWim Van Sebroeck static int wdt_set_heartbeat(int t) 174b7e04f8cSWim Van Sebroeck { 175b7e04f8cSWim Van Sebroeck if ((t < 1) || (t > 65535)) 176b7e04f8cSWim Van Sebroeck return -EINVAL; 177b7e04f8cSWim Van Sebroeck 178b7e04f8cSWim Van Sebroeck heartbeat = t; 179b7e04f8cSWim Van Sebroeck wd_heartbeat = t * 100; 180b7e04f8cSWim Van Sebroeck return 0; 181b7e04f8cSWim Van Sebroeck } 182b7e04f8cSWim Van Sebroeck 183b7e04f8cSWim Van Sebroeck /** 184b7e04f8cSWim Van Sebroeck * wdt_get_status: 185b7e04f8cSWim Van Sebroeck * @status: the new status. 186b7e04f8cSWim Van Sebroeck * 187b7e04f8cSWim Van Sebroeck * Extract the status information from a WDT watchdog device. There are 188b7e04f8cSWim Van Sebroeck * several board variants so we have to know which bits are valid. Some 189b7e04f8cSWim Van Sebroeck * bits default to one and some to zero in order to be maximally painful. 190b7e04f8cSWim Van Sebroeck * 191b7e04f8cSWim Van Sebroeck * we then map the bits onto the status ioctl flags. 192b7e04f8cSWim Van Sebroeck */ 193b7e04f8cSWim Van Sebroeck 194b7e04f8cSWim Van Sebroeck static int wdt_get_status(int *status) 195b7e04f8cSWim Van Sebroeck { 196*01c785dcSAlan Cox unsigned char new_status; 197*01c785dcSAlan Cox unsigned long flags; 198*01c785dcSAlan Cox 199*01c785dcSAlan Cox spin_lock_irqsave(&wdt_lock, flags); 200*01c785dcSAlan Cox new_status = inb_p(WDT_SR); 201*01c785dcSAlan Cox spin_unlock_irqrestore(&wdt_lock, flags); 202b7e04f8cSWim Van Sebroeck 203b7e04f8cSWim Van Sebroeck *status=0; 204b7e04f8cSWim Van Sebroeck if (new_status & WDC_SR_ISOI0) 205b7e04f8cSWim Van Sebroeck *status |= WDIOF_EXTERN1; 206b7e04f8cSWim Van Sebroeck if (new_status & WDC_SR_ISII1) 207b7e04f8cSWim Van Sebroeck *status |= WDIOF_EXTERN2; 208b7e04f8cSWim Van Sebroeck #ifdef CONFIG_WDT_501 209b7e04f8cSWim Van Sebroeck if (!(new_status & WDC_SR_TGOOD)) 210b7e04f8cSWim Van Sebroeck *status |= WDIOF_OVERHEAT; 211b7e04f8cSWim Van Sebroeck if (!(new_status & WDC_SR_PSUOVER)) 212b7e04f8cSWim Van Sebroeck *status |= WDIOF_POWEROVER; 213b7e04f8cSWim Van Sebroeck if (!(new_status & WDC_SR_PSUUNDR)) 214b7e04f8cSWim Van Sebroeck *status |= WDIOF_POWERUNDER; 215b7e04f8cSWim Van Sebroeck if (tachometer) { 216b7e04f8cSWim Van Sebroeck if (!(new_status & WDC_SR_FANGOOD)) 217b7e04f8cSWim Van Sebroeck *status |= WDIOF_FANFAULT; 218b7e04f8cSWim Van Sebroeck } 219b7e04f8cSWim Van Sebroeck #endif /* CONFIG_WDT_501 */ 220b7e04f8cSWim Van Sebroeck return 0; 221b7e04f8cSWim Van Sebroeck } 222b7e04f8cSWim Van Sebroeck 223b7e04f8cSWim Van Sebroeck #ifdef CONFIG_WDT_501 224b7e04f8cSWim Van Sebroeck /** 225b7e04f8cSWim Van Sebroeck * wdt_get_temperature: 226b7e04f8cSWim Van Sebroeck * 227b7e04f8cSWim Van Sebroeck * Reports the temperature in degrees Fahrenheit. The API is in 228b7e04f8cSWim Van Sebroeck * farenheit. It was designed by an imperial measurement luddite. 229b7e04f8cSWim Van Sebroeck */ 230b7e04f8cSWim Van Sebroeck 231b7e04f8cSWim Van Sebroeck static int wdt_get_temperature(int *temperature) 232b7e04f8cSWim Van Sebroeck { 233*01c785dcSAlan Cox unsigned short c; 234*01c785dcSAlan Cox unsigned long flags; 235b7e04f8cSWim Van Sebroeck 236*01c785dcSAlan Cox spin_lock_irqsave(&wdt_lock, flags); 237*01c785dcSAlan Cox c = inb_p(WDT_RT); 238*01c785dcSAlan Cox spin_unlock_irqrestore(&wdt_lock, flags); 239b7e04f8cSWim Van Sebroeck *temperature = (c * 11 / 15) + 7; 240b7e04f8cSWim Van Sebroeck return 0; 241b7e04f8cSWim Van Sebroeck } 242b7e04f8cSWim Van Sebroeck #endif /* CONFIG_WDT_501 */ 243b7e04f8cSWim Van Sebroeck 244b7e04f8cSWim Van Sebroeck /** 245b7e04f8cSWim Van Sebroeck * wdt_interrupt: 246b7e04f8cSWim Van Sebroeck * @irq: Interrupt number 247b7e04f8cSWim Van Sebroeck * @dev_id: Unused as we don't allow multiple devices. 248b7e04f8cSWim Van Sebroeck * 249b7e04f8cSWim Van Sebroeck * Handle an interrupt from the board. These are raised when the status 250b7e04f8cSWim Van Sebroeck * map changes in what the board considers an interesting way. That means 251b7e04f8cSWim Van Sebroeck * a failure condition occurring. 252b7e04f8cSWim Van Sebroeck */ 253b7e04f8cSWim Van Sebroeck 254b7e04f8cSWim Van Sebroeck static irqreturn_t wdt_interrupt(int irq, void *dev_id) 255b7e04f8cSWim Van Sebroeck { 256b7e04f8cSWim Van Sebroeck /* 257b7e04f8cSWim Van Sebroeck * Read the status register see what is up and 258b7e04f8cSWim Van Sebroeck * then printk it. 259b7e04f8cSWim Van Sebroeck */ 260*01c785dcSAlan Cox unsigned char status; 261*01c785dcSAlan Cox 262*01c785dcSAlan Cox spin_lock(&wdt_lock); 263*01c785dcSAlan Cox status = inb_p(WDT_SR); 264b7e04f8cSWim Van Sebroeck 265b7e04f8cSWim Van Sebroeck printk(KERN_CRIT "WDT status %d\n", status); 266b7e04f8cSWim Van Sebroeck 267b7e04f8cSWim Van Sebroeck #ifdef CONFIG_WDT_501 268b7e04f8cSWim Van Sebroeck if (!(status & WDC_SR_TGOOD)) 269b7e04f8cSWim Van Sebroeck printk(KERN_CRIT "Overheat alarm.(%d)\n",inb_p(WDT_RT)); 270b7e04f8cSWim Van Sebroeck if (!(status & WDC_SR_PSUOVER)) 271b7e04f8cSWim Van Sebroeck printk(KERN_CRIT "PSU over voltage.\n"); 272b7e04f8cSWim Van Sebroeck if (!(status & WDC_SR_PSUUNDR)) 273b7e04f8cSWim Van Sebroeck printk(KERN_CRIT "PSU under voltage.\n"); 274b7e04f8cSWim Van Sebroeck if (tachometer) { 275b7e04f8cSWim Van Sebroeck if (!(status & WDC_SR_FANGOOD)) 276b7e04f8cSWim Van Sebroeck printk(KERN_CRIT "Possible fan fault.\n"); 277b7e04f8cSWim Van Sebroeck } 278b7e04f8cSWim Van Sebroeck #endif /* CONFIG_WDT_501 */ 27959338d4cSIlpo Jarvinen if (!(status & WDC_SR_WCCR)) { 280b7e04f8cSWim Van Sebroeck #ifdef SOFTWARE_REBOOT 281b7e04f8cSWim Van Sebroeck #ifdef ONLY_TESTING 282b7e04f8cSWim Van Sebroeck printk(KERN_CRIT "Would Reboot.\n"); 283b7e04f8cSWim Van Sebroeck #else 284b7e04f8cSWim Van Sebroeck printk(KERN_CRIT "Initiating system reboot.\n"); 285b7e04f8cSWim Van Sebroeck emergency_restart(); 286b7e04f8cSWim Van Sebroeck #endif 287b7e04f8cSWim Van Sebroeck #else 288b7e04f8cSWim Van Sebroeck printk(KERN_CRIT "Reset in 5ms.\n"); 289b7e04f8cSWim Van Sebroeck #endif 29059338d4cSIlpo Jarvinen } 291*01c785dcSAlan Cox spin_unlock(&wdt_lock); 292b7e04f8cSWim Van Sebroeck return IRQ_HANDLED; 293b7e04f8cSWim Van Sebroeck } 294b7e04f8cSWim Van Sebroeck 295b7e04f8cSWim Van Sebroeck 296b7e04f8cSWim Van Sebroeck /** 297b7e04f8cSWim Van Sebroeck * wdt_write: 298b7e04f8cSWim Van Sebroeck * @file: file handle to the watchdog 299b7e04f8cSWim Van Sebroeck * @buf: buffer to write (unused as data does not matter here 300b7e04f8cSWim Van Sebroeck * @count: count of bytes 301b7e04f8cSWim Van Sebroeck * @ppos: pointer to the position to write. No seeks allowed 302b7e04f8cSWim Van Sebroeck * 303b7e04f8cSWim Van Sebroeck * A write to a watchdog device is defined as a keepalive signal. Any 304b7e04f8cSWim Van Sebroeck * write of data will do, as we we don't define content meaning. 305b7e04f8cSWim Van Sebroeck */ 306b7e04f8cSWim Van Sebroeck 307b7e04f8cSWim Van Sebroeck static ssize_t wdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) 308b7e04f8cSWim Van Sebroeck { 309b7e04f8cSWim Van Sebroeck if(count) { 310b7e04f8cSWim Van Sebroeck if (!nowayout) { 311b7e04f8cSWim Van Sebroeck size_t i; 312b7e04f8cSWim Van Sebroeck 313b7e04f8cSWim Van Sebroeck /* In case it was set long ago */ 314b7e04f8cSWim Van Sebroeck expect_close = 0; 315b7e04f8cSWim Van Sebroeck 316b7e04f8cSWim Van Sebroeck for (i = 0; i != count; i++) { 317b7e04f8cSWim Van Sebroeck char c; 318b7e04f8cSWim Van Sebroeck if (get_user(c, buf + i)) 319b7e04f8cSWim Van Sebroeck return -EFAULT; 320b7e04f8cSWim Van Sebroeck if (c == 'V') 321b7e04f8cSWim Van Sebroeck expect_close = 42; 322b7e04f8cSWim Van Sebroeck } 323b7e04f8cSWim Van Sebroeck } 324b7e04f8cSWim Van Sebroeck wdt_ping(); 325b7e04f8cSWim Van Sebroeck } 326b7e04f8cSWim Van Sebroeck return count; 327b7e04f8cSWim Van Sebroeck } 328b7e04f8cSWim Van Sebroeck 329b7e04f8cSWim Van Sebroeck /** 330b7e04f8cSWim Van Sebroeck * wdt_ioctl: 331b7e04f8cSWim Van Sebroeck * @inode: inode of the device 332b7e04f8cSWim Van Sebroeck * @file: file handle to the device 333b7e04f8cSWim Van Sebroeck * @cmd: watchdog command 334b7e04f8cSWim Van Sebroeck * @arg: argument pointer 335b7e04f8cSWim Van Sebroeck * 336b7e04f8cSWim Van Sebroeck * The watchdog API defines a common set of functions for all watchdogs 337b7e04f8cSWim Van Sebroeck * according to their available features. We only actually usefully support 338b7e04f8cSWim Van Sebroeck * querying capabilities and current status. 339b7e04f8cSWim Van Sebroeck */ 340b7e04f8cSWim Van Sebroeck 341b7e04f8cSWim Van Sebroeck static int wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, 342b7e04f8cSWim Van Sebroeck unsigned long arg) 343b7e04f8cSWim Van Sebroeck { 344b7e04f8cSWim Van Sebroeck void __user *argp = (void __user *)arg; 345b7e04f8cSWim Van Sebroeck int __user *p = argp; 346b7e04f8cSWim Van Sebroeck int new_heartbeat; 347b7e04f8cSWim Van Sebroeck int status; 348b7e04f8cSWim Van Sebroeck 349b7e04f8cSWim Van Sebroeck static struct watchdog_info ident = { 350b7e04f8cSWim Van Sebroeck .options = WDIOF_SETTIMEOUT| 351b7e04f8cSWim Van Sebroeck WDIOF_MAGICCLOSE| 352b7e04f8cSWim Van Sebroeck WDIOF_KEEPALIVEPING, 353b7e04f8cSWim Van Sebroeck .firmware_version = 1, 354b7e04f8cSWim Van Sebroeck .identity = "WDT500/501", 355b7e04f8cSWim Van Sebroeck }; 356b7e04f8cSWim Van Sebroeck 357b7e04f8cSWim Van Sebroeck /* Add options according to the card we have */ 358b7e04f8cSWim Van Sebroeck ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2); 359b7e04f8cSWim Van Sebroeck #ifdef CONFIG_WDT_501 360b7e04f8cSWim Van Sebroeck ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|WDIOF_POWEROVER); 361b7e04f8cSWim Van Sebroeck if (tachometer) 362b7e04f8cSWim Van Sebroeck ident.options |= WDIOF_FANFAULT; 363b7e04f8cSWim Van Sebroeck #endif /* CONFIG_WDT_501 */ 364b7e04f8cSWim Van Sebroeck 365b7e04f8cSWim Van Sebroeck switch(cmd) 366b7e04f8cSWim Van Sebroeck { 367b7e04f8cSWim Van Sebroeck default: 368b7e04f8cSWim Van Sebroeck return -ENOTTY; 369b7e04f8cSWim Van Sebroeck case WDIOC_GETSUPPORT: 370b7e04f8cSWim Van Sebroeck return copy_to_user(argp, &ident, sizeof(ident))?-EFAULT:0; 371b7e04f8cSWim Van Sebroeck 372b7e04f8cSWim Van Sebroeck case WDIOC_GETSTATUS: 373b7e04f8cSWim Van Sebroeck wdt_get_status(&status); 374b7e04f8cSWim Van Sebroeck return put_user(status, p); 375b7e04f8cSWim Van Sebroeck case WDIOC_GETBOOTSTATUS: 376b7e04f8cSWim Van Sebroeck return put_user(0, p); 377b7e04f8cSWim Van Sebroeck case WDIOC_KEEPALIVE: 378b7e04f8cSWim Van Sebroeck wdt_ping(); 379b7e04f8cSWim Van Sebroeck return 0; 380b7e04f8cSWim Van Sebroeck case WDIOC_SETTIMEOUT: 381b7e04f8cSWim Van Sebroeck if (get_user(new_heartbeat, p)) 382b7e04f8cSWim Van Sebroeck return -EFAULT; 383b7e04f8cSWim Van Sebroeck 384b7e04f8cSWim Van Sebroeck if (wdt_set_heartbeat(new_heartbeat)) 385b7e04f8cSWim Van Sebroeck return -EINVAL; 386b7e04f8cSWim Van Sebroeck 387b7e04f8cSWim Van Sebroeck wdt_ping(); 388b7e04f8cSWim Van Sebroeck /* Fall */ 389b7e04f8cSWim Van Sebroeck case WDIOC_GETTIMEOUT: 390b7e04f8cSWim Van Sebroeck return put_user(heartbeat, p); 391b7e04f8cSWim Van Sebroeck } 392b7e04f8cSWim Van Sebroeck } 393b7e04f8cSWim Van Sebroeck 394b7e04f8cSWim Van Sebroeck /** 395b7e04f8cSWim Van Sebroeck * wdt_open: 396b7e04f8cSWim Van Sebroeck * @inode: inode of device 397b7e04f8cSWim Van Sebroeck * @file: file handle to device 398b7e04f8cSWim Van Sebroeck * 399b7e04f8cSWim Van Sebroeck * The watchdog device has been opened. The watchdog device is single 400b7e04f8cSWim Van Sebroeck * open and on opening we load the counters. Counter zero is a 100Hz 401b7e04f8cSWim Van Sebroeck * cascade, into counter 1 which downcounts to reboot. When the counter 402b7e04f8cSWim Van Sebroeck * triggers counter 2 downcounts the length of the reset pulse which 403b7e04f8cSWim Van Sebroeck * set set to be as long as possible. 404b7e04f8cSWim Van Sebroeck */ 405b7e04f8cSWim Van Sebroeck 406b7e04f8cSWim Van Sebroeck static int wdt_open(struct inode *inode, struct file *file) 407b7e04f8cSWim Van Sebroeck { 408b7e04f8cSWim Van Sebroeck if(test_and_set_bit(0, &wdt_is_open)) 409b7e04f8cSWim Van Sebroeck return -EBUSY; 410b7e04f8cSWim Van Sebroeck /* 411b7e04f8cSWim Van Sebroeck * Activate 412b7e04f8cSWim Van Sebroeck */ 413b7e04f8cSWim Van Sebroeck wdt_start(); 414b7e04f8cSWim Van Sebroeck return nonseekable_open(inode, file); 415b7e04f8cSWim Van Sebroeck } 416b7e04f8cSWim Van Sebroeck 417b7e04f8cSWim Van Sebroeck /** 418b7e04f8cSWim Van Sebroeck * wdt_release: 419b7e04f8cSWim Van Sebroeck * @inode: inode to board 420b7e04f8cSWim Van Sebroeck * @file: file handle to board 421b7e04f8cSWim Van Sebroeck * 422b7e04f8cSWim Van Sebroeck * The watchdog has a configurable API. There is a religious dispute 423b7e04f8cSWim Van Sebroeck * between people who want their watchdog to be able to shut down and 424b7e04f8cSWim Van Sebroeck * those who want to be sure if the watchdog manager dies the machine 425b7e04f8cSWim Van Sebroeck * reboots. In the former case we disable the counters, in the latter 426b7e04f8cSWim Van Sebroeck * case you have to open it again very soon. 427b7e04f8cSWim Van Sebroeck */ 428b7e04f8cSWim Van Sebroeck 429b7e04f8cSWim Van Sebroeck static int wdt_release(struct inode *inode, struct file *file) 430b7e04f8cSWim Van Sebroeck { 431b7e04f8cSWim Van Sebroeck if (expect_close == 42) { 432b7e04f8cSWim Van Sebroeck wdt_stop(); 433b7e04f8cSWim Van Sebroeck clear_bit(0, &wdt_is_open); 434b7e04f8cSWim Van Sebroeck } else { 435b7e04f8cSWim Van Sebroeck printk(KERN_CRIT "wdt: WDT device closed unexpectedly. WDT will not stop!\n"); 436b7e04f8cSWim Van Sebroeck wdt_ping(); 437b7e04f8cSWim Van Sebroeck } 438b7e04f8cSWim Van Sebroeck expect_close = 0; 439b7e04f8cSWim Van Sebroeck return 0; 440b7e04f8cSWim Van Sebroeck } 441b7e04f8cSWim Van Sebroeck 442b7e04f8cSWim Van Sebroeck #ifdef CONFIG_WDT_501 443b7e04f8cSWim Van Sebroeck /** 444b7e04f8cSWim Van Sebroeck * wdt_temp_read: 445b7e04f8cSWim Van Sebroeck * @file: file handle to the watchdog board 446b7e04f8cSWim Van Sebroeck * @buf: buffer to write 1 byte into 447b7e04f8cSWim Van Sebroeck * @count: length of buffer 448b7e04f8cSWim Van Sebroeck * @ptr: offset (no seek allowed) 449b7e04f8cSWim Van Sebroeck * 450b7e04f8cSWim Van Sebroeck * Temp_read reports the temperature in degrees Fahrenheit. The API is in 451b7e04f8cSWim Van Sebroeck * farenheit. It was designed by an imperial measurement luddite. 452b7e04f8cSWim Van Sebroeck */ 453b7e04f8cSWim Van Sebroeck 454b7e04f8cSWim Van Sebroeck static ssize_t wdt_temp_read(struct file *file, char __user *buf, size_t count, loff_t *ptr) 455b7e04f8cSWim Van Sebroeck { 456b7e04f8cSWim Van Sebroeck int temperature; 457b7e04f8cSWim Van Sebroeck 458b7e04f8cSWim Van Sebroeck if (wdt_get_temperature(&temperature)) 459b7e04f8cSWim Van Sebroeck return -EFAULT; 460b7e04f8cSWim Van Sebroeck 461b7e04f8cSWim Van Sebroeck if (copy_to_user (buf, &temperature, 1)) 462b7e04f8cSWim Van Sebroeck return -EFAULT; 463b7e04f8cSWim Van Sebroeck 464b7e04f8cSWim Van Sebroeck return 1; 465b7e04f8cSWim Van Sebroeck } 466b7e04f8cSWim Van Sebroeck 467b7e04f8cSWim Van Sebroeck /** 468b7e04f8cSWim Van Sebroeck * wdt_temp_open: 469b7e04f8cSWim Van Sebroeck * @inode: inode of device 470b7e04f8cSWim Van Sebroeck * @file: file handle to device 471b7e04f8cSWim Van Sebroeck * 472b7e04f8cSWim Van Sebroeck * The temperature device has been opened. 473b7e04f8cSWim Van Sebroeck */ 474b7e04f8cSWim Van Sebroeck 475b7e04f8cSWim Van Sebroeck static int wdt_temp_open(struct inode *inode, struct file *file) 476b7e04f8cSWim Van Sebroeck { 477b7e04f8cSWim Van Sebroeck return nonseekable_open(inode, file); 478b7e04f8cSWim Van Sebroeck } 479b7e04f8cSWim Van Sebroeck 480b7e04f8cSWim Van Sebroeck /** 481b7e04f8cSWim Van Sebroeck * wdt_temp_release: 482b7e04f8cSWim Van Sebroeck * @inode: inode to board 483b7e04f8cSWim Van Sebroeck * @file: file handle to board 484b7e04f8cSWim Van Sebroeck * 485b7e04f8cSWim Van Sebroeck * The temperature device has been closed. 486b7e04f8cSWim Van Sebroeck */ 487b7e04f8cSWim Van Sebroeck 488b7e04f8cSWim Van Sebroeck static int wdt_temp_release(struct inode *inode, struct file *file) 489b7e04f8cSWim Van Sebroeck { 490b7e04f8cSWim Van Sebroeck return 0; 491b7e04f8cSWim Van Sebroeck } 492b7e04f8cSWim Van Sebroeck #endif /* CONFIG_WDT_501 */ 493b7e04f8cSWim Van Sebroeck 494b7e04f8cSWim Van Sebroeck /** 495b7e04f8cSWim Van Sebroeck * notify_sys: 496b7e04f8cSWim Van Sebroeck * @this: our notifier block 497b7e04f8cSWim Van Sebroeck * @code: the event being reported 498b7e04f8cSWim Van Sebroeck * @unused: unused 499b7e04f8cSWim Van Sebroeck * 500b7e04f8cSWim Van Sebroeck * Our notifier is called on system shutdowns. We want to turn the card 501b7e04f8cSWim Van Sebroeck * off at reboot otherwise the machine will reboot again during memory 502b7e04f8cSWim Van Sebroeck * test or worse yet during the following fsck. This would suck, in fact 503b7e04f8cSWim Van Sebroeck * trust me - if it happens it does suck. 504b7e04f8cSWim Van Sebroeck */ 505b7e04f8cSWim Van Sebroeck 506b7e04f8cSWim Van Sebroeck static int wdt_notify_sys(struct notifier_block *this, unsigned long code, 507b7e04f8cSWim Van Sebroeck void *unused) 508b7e04f8cSWim Van Sebroeck { 509b7e04f8cSWim Van Sebroeck if(code==SYS_DOWN || code==SYS_HALT) { 510b7e04f8cSWim Van Sebroeck /* Turn the card off */ 511b7e04f8cSWim Van Sebroeck wdt_stop(); 512b7e04f8cSWim Van Sebroeck } 513b7e04f8cSWim Van Sebroeck return NOTIFY_DONE; 514b7e04f8cSWim Van Sebroeck } 515b7e04f8cSWim Van Sebroeck 516b7e04f8cSWim Van Sebroeck /* 517b7e04f8cSWim Van Sebroeck * Kernel Interfaces 518b7e04f8cSWim Van Sebroeck */ 519b7e04f8cSWim Van Sebroeck 520b7e04f8cSWim Van Sebroeck 521b7e04f8cSWim Van Sebroeck static const struct file_operations wdt_fops = { 522b7e04f8cSWim Van Sebroeck .owner = THIS_MODULE, 523b7e04f8cSWim Van Sebroeck .llseek = no_llseek, 524b7e04f8cSWim Van Sebroeck .write = wdt_write, 525b7e04f8cSWim Van Sebroeck .ioctl = wdt_ioctl, 526b7e04f8cSWim Van Sebroeck .open = wdt_open, 527b7e04f8cSWim Van Sebroeck .release = wdt_release, 528b7e04f8cSWim Van Sebroeck }; 529b7e04f8cSWim Van Sebroeck 530b7e04f8cSWim Van Sebroeck static struct miscdevice wdt_miscdev = { 531b7e04f8cSWim Van Sebroeck .minor = WATCHDOG_MINOR, 532b7e04f8cSWim Van Sebroeck .name = "watchdog", 533b7e04f8cSWim Van Sebroeck .fops = &wdt_fops, 534b7e04f8cSWim Van Sebroeck }; 535b7e04f8cSWim Van Sebroeck 536b7e04f8cSWim Van Sebroeck #ifdef CONFIG_WDT_501 537b7e04f8cSWim Van Sebroeck static const struct file_operations wdt_temp_fops = { 538b7e04f8cSWim Van Sebroeck .owner = THIS_MODULE, 539b7e04f8cSWim Van Sebroeck .llseek = no_llseek, 540b7e04f8cSWim Van Sebroeck .read = wdt_temp_read, 541b7e04f8cSWim Van Sebroeck .open = wdt_temp_open, 542b7e04f8cSWim Van Sebroeck .release = wdt_temp_release, 543b7e04f8cSWim Van Sebroeck }; 544b7e04f8cSWim Van Sebroeck 545b7e04f8cSWim Van Sebroeck static struct miscdevice temp_miscdev = { 546b7e04f8cSWim Van Sebroeck .minor = TEMP_MINOR, 547b7e04f8cSWim Van Sebroeck .name = "temperature", 548b7e04f8cSWim Van Sebroeck .fops = &wdt_temp_fops, 549b7e04f8cSWim Van Sebroeck }; 550b7e04f8cSWim Van Sebroeck #endif /* CONFIG_WDT_501 */ 551b7e04f8cSWim Van Sebroeck 552b7e04f8cSWim Van Sebroeck /* 553b7e04f8cSWim Van Sebroeck * The WDT card needs to learn about soft shutdowns in order to 554b7e04f8cSWim Van Sebroeck * turn the timebomb registers off. 555b7e04f8cSWim Van Sebroeck */ 556b7e04f8cSWim Van Sebroeck 557b7e04f8cSWim Van Sebroeck static struct notifier_block wdt_notifier = { 558b7e04f8cSWim Van Sebroeck .notifier_call = wdt_notify_sys, 559b7e04f8cSWim Van Sebroeck }; 560b7e04f8cSWim Van Sebroeck 561b7e04f8cSWim Van Sebroeck /** 562b7e04f8cSWim Van Sebroeck * cleanup_module: 563b7e04f8cSWim Van Sebroeck * 564b7e04f8cSWim Van Sebroeck * Unload the watchdog. You cannot do this with any file handles open. 565b7e04f8cSWim Van Sebroeck * If your watchdog is set to continue ticking on close and you unload 566b7e04f8cSWim Van Sebroeck * it, well it keeps ticking. We won't get the interrupt but the board 567b7e04f8cSWim Van Sebroeck * will not touch PC memory so all is fine. You just have to load a new 568b7e04f8cSWim Van Sebroeck * module in 60 seconds or reboot. 569b7e04f8cSWim Van Sebroeck */ 570b7e04f8cSWim Van Sebroeck 571b7e04f8cSWim Van Sebroeck static void __exit wdt_exit(void) 572b7e04f8cSWim Van Sebroeck { 573b7e04f8cSWim Van Sebroeck misc_deregister(&wdt_miscdev); 574b7e04f8cSWim Van Sebroeck #ifdef CONFIG_WDT_501 575b7e04f8cSWim Van Sebroeck misc_deregister(&temp_miscdev); 576b7e04f8cSWim Van Sebroeck #endif /* CONFIG_WDT_501 */ 577b7e04f8cSWim Van Sebroeck unregister_reboot_notifier(&wdt_notifier); 578b7e04f8cSWim Van Sebroeck free_irq(irq, NULL); 579b7e04f8cSWim Van Sebroeck release_region(io,8); 580b7e04f8cSWim Van Sebroeck } 581b7e04f8cSWim Van Sebroeck 582b7e04f8cSWim Van Sebroeck /** 583b7e04f8cSWim Van Sebroeck * wdt_init: 584b7e04f8cSWim Van Sebroeck * 585b7e04f8cSWim Van Sebroeck * Set up the WDT watchdog board. All we have to do is grab the 586b7e04f8cSWim Van Sebroeck * resources we require and bitch if anyone beat us to them. 587b7e04f8cSWim Van Sebroeck * The open() function will actually kick the board off. 588b7e04f8cSWim Van Sebroeck */ 589b7e04f8cSWim Van Sebroeck 590b7e04f8cSWim Van Sebroeck static int __init wdt_init(void) 591b7e04f8cSWim Van Sebroeck { 592b7e04f8cSWim Van Sebroeck int ret; 593b7e04f8cSWim Van Sebroeck 594b7e04f8cSWim Van Sebroeck /* Check that the heartbeat value is within it's range ; if not reset to the default */ 595b7e04f8cSWim Van Sebroeck if (wdt_set_heartbeat(heartbeat)) { 596b7e04f8cSWim Van Sebroeck wdt_set_heartbeat(WD_TIMO); 597b7e04f8cSWim Van Sebroeck printk(KERN_INFO "wdt: heartbeat value must be 0<heartbeat<65536, using %d\n", 598b7e04f8cSWim Van Sebroeck WD_TIMO); 599b7e04f8cSWim Van Sebroeck } 600b7e04f8cSWim Van Sebroeck 601b7e04f8cSWim Van Sebroeck if (!request_region(io, 8, "wdt501p")) { 602b7e04f8cSWim Van Sebroeck printk(KERN_ERR "wdt: I/O address 0x%04x already in use\n", io); 603b7e04f8cSWim Van Sebroeck ret = -EBUSY; 604b7e04f8cSWim Van Sebroeck goto out; 605b7e04f8cSWim Van Sebroeck } 606b7e04f8cSWim Van Sebroeck 607b7e04f8cSWim Van Sebroeck ret = request_irq(irq, wdt_interrupt, IRQF_DISABLED, "wdt501p", NULL); 608b7e04f8cSWim Van Sebroeck if(ret) { 609b7e04f8cSWim Van Sebroeck printk(KERN_ERR "wdt: IRQ %d is not free.\n", irq); 610b7e04f8cSWim Van Sebroeck goto outreg; 611b7e04f8cSWim Van Sebroeck } 612b7e04f8cSWim Van Sebroeck 613b7e04f8cSWim Van Sebroeck ret = register_reboot_notifier(&wdt_notifier); 614b7e04f8cSWim Van Sebroeck if(ret) { 615b7e04f8cSWim Van Sebroeck printk(KERN_ERR "wdt: cannot register reboot notifier (err=%d)\n", ret); 616b7e04f8cSWim Van Sebroeck goto outirq; 617b7e04f8cSWim Van Sebroeck } 618b7e04f8cSWim Van Sebroeck 619b7e04f8cSWim Van Sebroeck #ifdef CONFIG_WDT_501 620b7e04f8cSWim Van Sebroeck ret = misc_register(&temp_miscdev); 621b7e04f8cSWim Van Sebroeck if (ret) { 622b7e04f8cSWim Van Sebroeck printk(KERN_ERR "wdt: cannot register miscdev on minor=%d (err=%d)\n", 623b7e04f8cSWim Van Sebroeck TEMP_MINOR, ret); 624b7e04f8cSWim Van Sebroeck goto outrbt; 625b7e04f8cSWim Van Sebroeck } 626b7e04f8cSWim Van Sebroeck #endif /* CONFIG_WDT_501 */ 627b7e04f8cSWim Van Sebroeck 628b7e04f8cSWim Van Sebroeck ret = misc_register(&wdt_miscdev); 629b7e04f8cSWim Van Sebroeck if (ret) { 630b7e04f8cSWim Van Sebroeck printk(KERN_ERR "wdt: cannot register miscdev on minor=%d (err=%d)\n", 631b7e04f8cSWim Van Sebroeck WATCHDOG_MINOR, ret); 632b7e04f8cSWim Van Sebroeck goto outmisc; 633b7e04f8cSWim Van Sebroeck } 634b7e04f8cSWim Van Sebroeck 635b7e04f8cSWim Van Sebroeck ret = 0; 636b7e04f8cSWim Van Sebroeck printk(KERN_INFO "WDT500/501-P driver 0.10 at 0x%04x (Interrupt %d). heartbeat=%d sec (nowayout=%d)\n", 637b7e04f8cSWim Van Sebroeck io, irq, heartbeat, nowayout); 638b7e04f8cSWim Van Sebroeck #ifdef CONFIG_WDT_501 639b7e04f8cSWim Van Sebroeck printk(KERN_INFO "wdt: Fan Tachometer is %s\n", (tachometer ? "Enabled" : "Disabled")); 640b7e04f8cSWim Van Sebroeck #endif /* CONFIG_WDT_501 */ 641b7e04f8cSWim Van Sebroeck 642b7e04f8cSWim Van Sebroeck out: 643b7e04f8cSWim Van Sebroeck return ret; 644b7e04f8cSWim Van Sebroeck 645b7e04f8cSWim Van Sebroeck outmisc: 646b7e04f8cSWim Van Sebroeck #ifdef CONFIG_WDT_501 647b7e04f8cSWim Van Sebroeck misc_deregister(&temp_miscdev); 648b7e04f8cSWim Van Sebroeck outrbt: 649b7e04f8cSWim Van Sebroeck #endif /* CONFIG_WDT_501 */ 650b7e04f8cSWim Van Sebroeck unregister_reboot_notifier(&wdt_notifier); 651b7e04f8cSWim Van Sebroeck outirq: 652b7e04f8cSWim Van Sebroeck free_irq(irq, NULL); 653b7e04f8cSWim Van Sebroeck outreg: 654b7e04f8cSWim Van Sebroeck release_region(io,8); 655b7e04f8cSWim Van Sebroeck goto out; 656b7e04f8cSWim Van Sebroeck } 657b7e04f8cSWim Van Sebroeck 658b7e04f8cSWim Van Sebroeck module_init(wdt_init); 659b7e04f8cSWim Van Sebroeck module_exit(wdt_exit); 660b7e04f8cSWim Van Sebroeck 661b7e04f8cSWim Van Sebroeck MODULE_AUTHOR("Alan Cox"); 662b7e04f8cSWim Van Sebroeck MODULE_DESCRIPTION("Driver for ISA ICS watchdog cards (WDT500/501)"); 663b7e04f8cSWim Van Sebroeck MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); 664b7e04f8cSWim Van Sebroeck MODULE_ALIAS_MISCDEV(TEMP_MINOR); 665b7e04f8cSWim Van Sebroeck MODULE_LICENSE("GPL"); 666