*
* (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
*
- * (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved.
- * http://www.redhat.com
+ * (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
+ * All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/spinlock.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
-#include <asm/io.h>
-#include <asm/uaccess.h>
#include <asm/system.h>
#define WATCHDOG_NAME "w83697hf/hg WDT"
#define PFX WATCHDOG_NAME ": "
#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
+#define WATCHDOG_EARLY_DISABLE 1 /* Disable until userland kicks in */
static unsigned long wdt_is_open;
static char expect_close;
/* You must set this - there is no sane way to probe for this board. */
static int wdt_io = 0x2e;
module_param(wdt_io, int, 0);
-MODULE_PARM_DESC(wdt_io, "w83697hf/hg WDT io port (default 0x2e, 0 = autodetect)");
+MODULE_PARM_DESC(wdt_io,
+ "w83697hf/hg WDT io port (default 0x2e, 0 = autodetect)");
static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
module_param(timeout, int, 0);
-MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. 1<= timeout <=255 (default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
+MODULE_PARM_DESC(timeout,
+ "Watchdog timeout in seconds. 1<= timeout <=255 (default="
+ __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0);
-MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+MODULE_PARM_DESC(nowayout,
+ "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+static int early_disable = WATCHDOG_EARLY_DISABLE;
+module_param(early_disable, int, 0);
+MODULE_PARM_DESC(early_disable,
+ "Watchdog gets disabled at boot time (default="
+ __MODULE_STRING(WATCHDOG_EARLY_DISABLE) ")");
/*
* Kernel methods.
*/
-#define W83697HF_EFER (wdt_io+0) /* Extended Function Enable Register */
-#define W83697HF_EFIR (wdt_io+0) /* Extended Function Index Register (same as EFER) */
-#define W83697HF_EFDR (wdt_io+1) /* Extended Function Data Register */
+#define W83697HF_EFER (wdt_io + 0) /* Extended Function Enable Register */
+#define W83697HF_EFIR (wdt_io + 0) /* Extended Function Index Register
+ (same as EFER) */
+#define W83697HF_EFDR (wdt_io + 1) /* Extended Function Data Register */
-static inline void
-w83697hf_unlock(void)
+static inline void w83697hf_unlock(void)
{
outb_p(0x87, W83697HF_EFER); /* Enter extended function mode */
outb_p(0x87, W83697HF_EFER); /* Again according to manual */
}
-static inline void
-w83697hf_lock(void)
+static inline void w83697hf_lock(void)
{
outb_p(0xAA, W83697HF_EFER); /* Leave extended function mode */
}
* w83697hf_write_timeout() must be called with the device unlocked.
*/
-static unsigned char
-w83697hf_get_reg(unsigned char reg)
+static unsigned char w83697hf_get_reg(unsigned char reg)
{
outb_p(reg, W83697HF_EFIR);
return inb_p(W83697HF_EFDR);
}
-static void
-w83697hf_set_reg(unsigned char reg, unsigned char data)
+static void w83697hf_set_reg(unsigned char reg, unsigned char data)
{
outb_p(reg, W83697HF_EFIR);
outb_p(data, W83697HF_EFDR);
}
-static void
-w83697hf_write_timeout(int timeout)
+static void w83697hf_write_timeout(int timeout)
{
- w83697hf_set_reg(0xF4, timeout); /* Write Timeout counter to CRF4 */
+ /* Write Timeout counter to CRF4 */
+ w83697hf_set_reg(0xF4, timeout);
}
-static void
-w83697hf_select_wdt(void)
+static void w83697hf_select_wdt(void)
{
w83697hf_unlock();
w83697hf_set_reg(0x07, 0x08); /* Switch to logic device 8 (GPIO2) */
}
-static inline void
-w83697hf_deselect_wdt(void)
+static inline void w83697hf_deselect_wdt(void)
{
w83697hf_lock();
}
-static void
-w83697hf_init(void)
+static void w83697hf_init(void)
{
unsigned char bbuf;
bbuf = w83697hf_get_reg(0x29);
bbuf &= ~0x60;
bbuf |= 0x20;
- w83697hf_set_reg(0x29, bbuf); /* Set pin 119 to WDTO# mode (= CR29, WDT0) */
+
+ /* Set pin 119 to WDTO# mode (= CR29, WDT0) */
+ w83697hf_set_reg(0x29, bbuf);
bbuf = w83697hf_get_reg(0xF3);
bbuf &= ~0x04;
w83697hf_deselect_wdt();
}
-static void
-wdt_ping(void)
+static void wdt_ping(void)
{
spin_lock(&io_lock);
w83697hf_select_wdt();
spin_unlock(&io_lock);
}
-static void
-wdt_enable(void)
+static void wdt_enable(void)
{
spin_lock(&io_lock);
w83697hf_select_wdt();
spin_unlock(&io_lock);
}
-static void
-wdt_disable(void)
+static void wdt_disable(void)
{
spin_lock(&io_lock);
w83697hf_select_wdt();
spin_unlock(&io_lock);
}
-static int
-wdt_set_heartbeat(int t)
+static unsigned char wdt_running(void)
+{
+ unsigned char t;
+
+ spin_lock(&io_lock);
+ w83697hf_select_wdt();
+
+ t = w83697hf_get_reg(0xF4); /* Read timer */
+
+ w83697hf_deselect_wdt();
+ spin_unlock(&io_lock);
+
+ return t;
+}
+
+static int wdt_set_heartbeat(int t)
{
- if ((t < 1) || (t > 255))
+ if (t < 1 || t > 255)
return -EINVAL;
timeout = t;
return 0;
}
-static ssize_t
-wdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
+static ssize_t wdt_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
{
if (count) {
if (!nowayout) {
for (i = 0; i != count; i++) {
char c;
- if (get_user(c, buf+i))
+ if (get_user(c, buf + i))
return -EFAULT;
if (c == 'V')
expect_close = 42;
return count;
}
-static int
-wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
- unsigned long arg)
+static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
void __user *argp = (void __user *)arg;
int __user *p = argp;
int new_timeout;
- static struct watchdog_info ident = {
- .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
+ static const struct watchdog_info ident = {
+ .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT
+ | WDIOF_MAGICCLOSE,
.firmware_version = 1,
.identity = "W83697HF WDT",
};
case WDIOC_GETBOOTSTATUS:
return put_user(0, p);
- case WDIOC_KEEPALIVE:
- wdt_ping();
- break;
-
- case WDIOC_SETTIMEOUT:
- if (get_user(new_timeout, p))
- return -EFAULT;
- if (wdt_set_heartbeat(new_timeout))
- return -EINVAL;
- wdt_ping();
- /* Fall */
-
- case WDIOC_GETTIMEOUT:
- return put_user(timeout, p);
-
case WDIOC_SETOPTIONS:
{
int options, retval = -EINVAL;
return retval;
}
+ case WDIOC_KEEPALIVE:
+ wdt_ping();
+ break;
+
+ case WDIOC_SETTIMEOUT:
+ if (get_user(new_timeout, p))
+ return -EFAULT;
+ if (wdt_set_heartbeat(new_timeout))
+ return -EINVAL;
+ wdt_ping();
+ /* Fall */
+
+ case WDIOC_GETTIMEOUT:
+ return put_user(timeout, p);
+
default:
return -ENOTTY;
}
return 0;
}
-static int
-wdt_open(struct inode *inode, struct file *file)
+static int wdt_open(struct inode *inode, struct file *file)
{
if (test_and_set_bit(0, &wdt_is_open))
return -EBUSY;
return nonseekable_open(inode, file);
}
-static int
-wdt_close(struct inode *inode, struct file *file)
+static int wdt_close(struct inode *inode, struct file *file)
{
- if (expect_close == 42) {
+ if (expect_close == 42)
wdt_disable();
- } else {
- printk (KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
+ else {
+ printk(KERN_CRIT PFX
+ "Unexpected close, not stopping watchdog!\n");
wdt_ping();
}
expect_close = 0;
* Notifier for system down
*/
-static int
-wdt_notify_sys(struct notifier_block *this, unsigned long code,
+static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
void *unused)
{
- if (code == SYS_DOWN || code == SYS_HALT) {
- /* Turn the WDT off */
- wdt_disable();
- }
+ if (code == SYS_DOWN || code == SYS_HALT)
+ wdt_disable(); /* Turn the WDT off */
+
return NOTIFY_DONE;
}
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = wdt_write,
- .ioctl = wdt_ioctl,
+ .unlocked_ioctl = wdt_ioctl,
.open = wdt_open,
.release = wdt_close,
};
.notifier_call = wdt_notify_sys,
};
-static int
-w83697hf_check_wdt(void)
+static int w83697hf_check_wdt(void)
{
if (!request_region(wdt_io, 2, WATCHDOG_NAME)) {
- printk (KERN_ERR PFX "I/O address 0x%x already in use\n", wdt_io);
+ printk(KERN_ERR PFX
+ "I/O address 0x%x already in use\n", wdt_io);
return -EIO;
}
- printk (KERN_DEBUG PFX "Looking for watchdog at address 0x%x\n", wdt_io);
+ printk(KERN_DEBUG PFX
+ "Looking for watchdog at address 0x%x\n", wdt_io);
w83697hf_unlock();
if (w83697hf_get_reg(0x20) == 0x60) {
- printk (KERN_INFO PFX "watchdog found at address 0x%x\n", wdt_io);
+ printk(KERN_INFO PFX
+ "watchdog found at address 0x%x\n", wdt_io);
w83697hf_lock();
return 0;
}
- w83697hf_lock(); /* Reprotect in case it was a compatible device */
+ /* Reprotect in case it was a compatible device */
+ w83697hf_lock();
- printk (KERN_INFO PFX "watchdog not found at address 0x%x\n", wdt_io);
+ printk(KERN_INFO PFX "watchdog not found at address 0x%x\n", wdt_io);
release_region(wdt_io, 2);
return -EIO;
}
static int w83697hf_ioports[] = { 0x2e, 0x4e, 0x00 };
-static int __init
-wdt_init(void)
+static int __init wdt_init(void)
{
int ret, i, found = 0;
- printk (KERN_INFO PFX "WDT driver for W83697HF/HG initializing\n");
+ printk(KERN_INFO PFX "WDT driver for W83697HF/HG initializing\n");
if (wdt_io == 0) {
/* we will autodetect the W83697HF/HG watchdog */
}
if (!found) {
- printk (KERN_ERR PFX "No W83697HF/HG could be found\n");
+ printk(KERN_ERR PFX "No W83697HF/HG could be found\n");
ret = -EIO;
goto out;
}
w83697hf_init();
- wdt_disable(); /* Disable watchdog until first use */
+ if (early_disable) {
+ if (wdt_running())
+ printk(KERN_WARNING PFX "Stopping previously enabled "
+ "watchdog until userland kicks in\n");
+ wdt_disable();
+ }
if (wdt_set_heartbeat(timeout)) {
wdt_set_heartbeat(WATCHDOG_TIMEOUT);
- printk (KERN_INFO PFX "timeout value must be 1<=timeout<=255, using %d\n",
- WATCHDOG_TIMEOUT);
+ printk(KERN_INFO PFX
+ "timeout value must be 1 <= timeout <= 255, using %d\n",
+ WATCHDOG_TIMEOUT);
}
ret = register_reboot_notifier(&wdt_notifier);
if (ret != 0) {
- printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
- ret);
+ printk(KERN_ERR PFX
+ "cannot register reboot notifier (err=%d)\n", ret);
goto unreg_regions;
}
ret = misc_register(&wdt_miscdev);
if (ret != 0) {
- printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
- WATCHDOG_MINOR, ret);
+ printk(KERN_ERR PFX
+ "cannot register miscdev on minor=%d (err=%d)\n",
+ WATCHDOG_MINOR, ret);
goto unreg_reboot;
}
- printk (KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n",
+ printk(KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n",
timeout, nowayout);
out:
goto out;
}
-static void __exit
-wdt_exit(void)
+static void __exit wdt_exit(void)
{
misc_deregister(&wdt_miscdev);
unregister_reboot_notifier(&wdt_notifier);
module_exit(wdt_exit);
MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Marcus Junker <junker@anduras.de>, Samuel Tardieu <sam@rfc1149.net>");
+MODULE_AUTHOR("Marcus Junker <junker@anduras.de>, "
+ "Samuel Tardieu <sam@rfc1149.net>");
MODULE_DESCRIPTION("w83697hf/hg WDT driver");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff