Commit bea9b7fa authored by Linus Torvalds's avatar Linus Torvalds

Merge

parents 5dbafd23 541aaffb
...@@ -346,6 +346,18 @@ config ALIM7101_WDT ...@@ -346,6 +346,18 @@ config ALIM7101_WDT
module, say M here and read <file:Documentation/modules.txt>. Most module, say M here and read <file:Documentation/modules.txt>. Most
people will say N. people will say N.
config ALIM1535_WDT
tristate "ALi M1535 PMU Watchdog Timer"
depends on WATCHDOG
---help---
This is the driver for the hardware watchdog on the ALi M1535 PMU.
This driver is also available as a module ( = code which can be
inserted in and removed from the running kernel whenever you want).
The module is called alim1535_wdt. If you want to compile it as a
module, say M here and read <file:Documentation/modules.txt>. Most
people will say N.
config SC1200_WDT config SC1200_WDT
tristate "National Semiconductor PC87307/PC97307 (ala SC1200) Watchdog" tristate "National Semiconductor PC87307/PC97307 (ala SC1200) Watchdog"
depends on WATCHDOG depends on WATCHDOG
......
...@@ -27,6 +27,7 @@ obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o ...@@ -27,6 +27,7 @@ obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o
obj-$(CONFIG_W83877F_WDT) += w83877f_wdt.o obj-$(CONFIG_W83877F_WDT) += w83877f_wdt.o
obj-$(CONFIG_SC520_WDT) += sc520_wdt.o obj-$(CONFIG_SC520_WDT) += sc520_wdt.o
obj-$(CONFIG_ALIM7101_WDT) += alim7101_wdt.o obj-$(CONFIG_ALIM7101_WDT) += alim7101_wdt.o
obj-$(CONFIG_ALIM1535_WDT) += alim1535_wdt.o
obj-$(CONFIG_SC1200_WDT) += sc1200wdt.o obj-$(CONFIG_SC1200_WDT) += sc1200wdt.o
obj-$(CONFIG_WAFER_WDT) += wafer5823wdt.o obj-$(CONFIG_WAFER_WDT) += wafer5823wdt.o
obj-$(CONFIG_CPU5_WDT) += cpu5wdt.o obj-$(CONFIG_CPU5_WDT) += cpu5wdt.o
......
/* /*
* Acquire Single Board Computer Watchdog Timer driver for Linux 2.1.x * Acquire Single Board Computer Watchdog Timer driver
* *
* Based on wdt.c. Original copyright messages: * Based on wdt.c. Original copyright messages:
* *
...@@ -10,10 +10,10 @@ ...@@ -10,10 +10,10 @@
* modify it under the terms of the GNU General Public License * modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version * as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version. * 2 of the License, or (at your option) any later version.
* *
* Neither Alan Cox nor CymruNet Ltd. admit liability nor provide * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
* warranty for any of this software. This material is provided * warranty for any of this software. This material is provided
* "AS-IS" and at no charge. * "AS-IS" and at no charge.
* *
* (c) Copyright 1995 Alan Cox <alan@redhat.com> * (c) Copyright 1995 Alan Cox <alan@redhat.com>
* *
...@@ -22,33 +22,39 @@ ...@@ -22,33 +22,39 @@
* Can't add timeout - driver doesn't allow changing value * Can't add timeout - driver doesn't allow changing value
*/ */
#include <linux/config.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/moduleparam.h> #include <linux/moduleparam.h>
#include <linux/types.h> #include <linux/types.h>
#include <linux/miscdevice.h> #include <linux/miscdevice.h>
#include <linux/watchdog.h> #include <linux/watchdog.h>
#include <linux/fs.h>
#include <linux/ioport.h> #include <linux/ioport.h>
#include <linux/notifier.h> #include <linux/notifier.h>
#include <linux/fs.h>
#include <linux/reboot.h> #include <linux/reboot.h>
#include <linux/init.h> #include <linux/init.h>
#include <linux/spinlock.h>
#include <asm/io.h> #include <asm/io.h>
#include <asm/uaccess.h> #include <asm/uaccess.h>
#include <asm/system.h> #include <asm/system.h>
static int acq_is_open; #define WATCHDOG_NAME "Acquire WDT"
static spinlock_t acq_lock; #define PFX WATCHDOG_NAME ": "
static int expect_close = 0; #define WATCHDOG_TIMEOUT 0 /* ??? Is the timeout hardcoded to 1 minute ??? */
static unsigned long acq_is_open;
static char expect_close;
/* /*
* You must set these - there is no sane way to probe for this board. * You must set these - there is no sane way to probe for this board.
*/ */
#define WDT_STOP 0x43 static int wdt_stop = 0x43;
#define WDT_START 0x443 module_param(wdt_stop, int, 0);
MODULE_PARM_DESC(wdt_stop, "Acquire WDT 'stop' io port (default 0x43)");
static int wdt_start = 0x443;
module_param(wdt_start, int, 0);
MODULE_PARM_DESC(wdt_start, "Acquire WDT 'start' io port (default 0x443)");
#ifdef CONFIG_WATCHDOG_NOWAYOUT #ifdef CONFIG_WATCHDOG_NOWAYOUT
static int nowayout = 1; static int nowayout = 1;
...@@ -62,38 +68,52 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CON ...@@ -62,38 +68,52 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CON
/* /*
* Kernel methods. * Kernel methods.
*/ */
static void acq_ping(void) static void acq_ping(void)
{ {
/* Write a watchdog value */ /* Write a watchdog value */
inb_p(WDT_START); inb_p(wdt_start);
} }
static void acq_stop(void)
{
/* Turn the card off */
inb_p(wdt_stop);
}
/*
* /dev/watchdog handling.
*/
static ssize_t acq_write(struct file *file, const char *buf, size_t count, loff_t *ppos) static ssize_t acq_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
{ {
/* Can't seek (pwrite) on this device */ /* Can't seek (pwrite) on this device */
if (ppos != &file->f_pos) if (ppos != &file->f_pos)
return -ESPIPE; return -ESPIPE;
/* See if we got the magic character 'V' and reload the timer */
if(count) { if(count) {
if (!nowayout) { if (!nowayout) {
size_t i; size_t i;
/* note: just in case someone wrote the magic character
* five months ago... */
expect_close = 0; expect_close = 0;
/* scan to see wether or not we got the magic character */
for (i = 0; i != count; i++) { for (i = 0; i != count; i++) {
char c; char c;
if (get_user(c, buf + i)) if (get_user(c, buf + i))
return -EFAULT; return -EFAULT;
if (c == 'V') if (c == 'V')
expect_close = 1; expect_close = 42;
} }
} }
/* Well, anyhow someone wrote to us, we should return that favour */
acq_ping(); acq_ping();
return 1;
} }
return 0; return count;
} }
static int acq_ioctl(struct inode *inode, struct file *file, unsigned int cmd, static int acq_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
...@@ -103,65 +123,75 @@ static int acq_ioctl(struct inode *inode, struct file *file, unsigned int cmd, ...@@ -103,65 +123,75 @@ static int acq_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
{ {
.options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, .options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
.firmware_version = 1, .firmware_version = 1,
.identity = "Acquire WDT" .identity = "Acquire WDT",
}; };
switch(cmd) switch(cmd)
{ {
case WDIOC_GETSUPPORT: case WDIOC_GETSUPPORT:
if (copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident))) return copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident)) ? -EFAULT : 0;
return -EFAULT;
break;
case WDIOC_GETSTATUS: case WDIOC_GETSTATUS:
if (copy_to_user((int *)arg, &acq_is_open, sizeof(int))) case WDIOC_GETBOOTSTATUS:
return -EFAULT; return put_user(0, (int *)arg);
break;
case WDIOC_KEEPALIVE: case WDIOC_KEEPALIVE:
acq_ping(); acq_ping();
break; return 0;
case WDIOC_GETTIMEOUT:
return put_user(WATCHDOG_TIMEOUT, (int *)arg);
case WDIOC_SETOPTIONS:
{
int options, retval = -EINVAL;
if (get_user(options, (int *)arg))
return -EFAULT;
if (options & WDIOS_DISABLECARD)
{
acq_stop();
retval = 0;
}
if (options & WDIOS_ENABLECARD)
{
acq_ping();
retval = 0;
}
return retval;
}
default: default:
return -ENOTTY; return -ENOIOCTLCMD;
} }
return 0;
} }
static int acq_open(struct inode *inode, struct file *file) static int acq_open(struct inode *inode, struct file *file)
{ {
if ((iminor(inode) == WATCHDOG_MINOR)) { if (test_and_set_bit(0, &acq_is_open))
spin_lock(&acq_lock); return -EBUSY;
if(acq_is_open) {
spin_unlock(&acq_lock);
return -EBUSY;
}
if (nowayout)
__module_get(THIS_MODULE);
/* Activate */ if (nowayout)
acq_is_open=1; __module_get(THIS_MODULE);
inb_p(WDT_START);
spin_unlock(&acq_lock);
return 0;
} else { /* Activate */
return -ENODEV; acq_ping();
} return 0;
} }
static int acq_close(struct inode *inode, struct file *file) static int acq_close(struct inode *inode, struct file *file)
{ {
if(iminor(inode)==WATCHDOG_MINOR) { if (expect_close == 42) {
spin_lock(&acq_lock); acq_stop();
if (expect_close) } else {
inb_p(WDT_STOP); printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
else acq_ping();
printk(KERN_CRIT "WDT closed unexpectedly. WDT will not stop!\n");
acq_is_open=0;
spin_unlock(&acq_lock);
} }
clear_bit(0, &acq_is_open);
expect_close = 0;
return 0; return 0;
} }
...@@ -172,20 +202,20 @@ static int acq_close(struct inode *inode, struct file *file) ...@@ -172,20 +202,20 @@ static int acq_close(struct inode *inode, struct file *file)
static int acq_notify_sys(struct notifier_block *this, unsigned long code, static int acq_notify_sys(struct notifier_block *this, unsigned long code,
void *unused) void *unused)
{ {
if(code==SYS_DOWN || code==SYS_HALT) if(code==SYS_DOWN || code==SYS_HALT) {
/* Turn the card off */ /* Turn the WDT off */
inb_p(WDT_STOP); acq_stop();
}
return NOTIFY_DONE; return NOTIFY_DONE;
} }
/* /*
* Kernel Interfaces * Kernel Interfaces
*/ */
static struct file_operations acq_fops = { static struct file_operations acq_fops = {
.owner = THIS_MODULE, .owner = THIS_MODULE,
.llseek = no_llseek,
.write = acq_write, .write = acq_write,
.ioctl = acq_ioctl, .ioctl = acq_ioctl,
.open = acq_open, .open = acq_open,
...@@ -196,52 +226,84 @@ static struct miscdevice acq_miscdev= ...@@ -196,52 +226,84 @@ static struct miscdevice acq_miscdev=
{ {
.minor = WATCHDOG_MINOR, .minor = WATCHDOG_MINOR,
.name = "watchdog", .name = "watchdog",
.fops = &acq_fops .fops = &acq_fops,
}; };
/* /*
* The WDT card needs to learn about soft shutdowns in order to * The WDT card needs to learn about soft shutdowns in order to
* turn the timebomb registers off. * turn the timebomb registers off.
*/ */
static struct notifier_block acq_notifier = static struct notifier_block acq_notifier =
{ {
.notifier_call = acq_notify_sys, .notifier_call = acq_notify_sys,
.next = NULL, .next = NULL,
.priority = 0 .priority = 0,
}; };
static int __init acq_init(void) static int __init acq_init(void)
{ {
int ret;
printk(KERN_INFO "WDT driver for Acquire single board computer initialising.\n"); printk(KERN_INFO "WDT driver for Acquire single board computer initialising.\n");
spin_lock_init(&acq_lock); if (wdt_stop != wdt_start) {
if (misc_register(&acq_miscdev)) if (!request_region(wdt_stop, 1, WATCHDOG_NAME)) {
return -ENODEV; printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
if (!request_region(WDT_STOP, 1, "Acquire WDT")) { wdt_stop);
misc_deregister(&acq_miscdev); ret = -EIO;
return -EIO; goto out;
}
} }
if (!request_region(WDT_START, 1, "Acquire WDT")) {
release_region(WDT_STOP, 1); if (!request_region(wdt_start, 1, WATCHDOG_NAME)) {
misc_deregister(&acq_miscdev); printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
return -EIO; wdt_start);
ret = -EIO;
goto unreg_stop;
} }
register_reboot_notifier(&acq_notifier); ret = register_reboot_notifier(&acq_notifier);
return 0; if (ret != 0) {
printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
ret);
goto unreg_regions;
}
ret = misc_register(&acq_miscdev);
if (ret != 0) {
printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, ret);
goto unreg_reboot;
}
printk (KERN_INFO PFX "initialized. (nowayout=%d)\n",
nowayout);
out:
return ret;
unreg_reboot:
unregister_reboot_notifier(&acq_notifier);
unreg_regions:
release_region(wdt_start, 1);
unreg_stop:
if (wdt_stop != wdt_start)
release_region(wdt_stop, 1);
goto out;
} }
static void __exit acq_exit(void) static void __exit acq_exit(void)
{ {
misc_deregister(&acq_miscdev); misc_deregister(&acq_miscdev);
unregister_reboot_notifier(&acq_notifier); unregister_reboot_notifier(&acq_notifier);
release_region(WDT_STOP,1); if(wdt_stop != wdt_start)
release_region(WDT_START,1); release_region(wdt_stop,1);
release_region(wdt_start,1);
} }
module_init(acq_init); module_init(acq_init);
module_exit(acq_exit); module_exit(acq_exit);
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");
MODULE_AUTHOR("Unkown");
MODULE_DESCRIPTION("Acquire Single Board Computer Watchdog Timer driver");
...@@ -133,7 +133,7 @@ advwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, ...@@ -133,7 +133,7 @@ advwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
static struct watchdog_info ident = { static struct watchdog_info ident = {
.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
.firmware_version = 1, .firmware_version = 1,
.identity = "Advantech WDT" .identity = "Advantech WDT",
}; };
switch (cmd) { switch (cmd) {
......
This diff is collapsed.
/* /*
* ICP Wafer 5823 Single Board Computer WDT driver for Linux 2.4.x * ICP Wafer 5823 Single Board Computer WDT driver
* http://www.icpamerica.com/wafer_5823.php * http://www.icpamerica.com/wafer_5823.php
* May also work on other similar models * May also work on other similar models
* *
...@@ -17,10 +17,10 @@ ...@@ -17,10 +17,10 @@
* modify it under the terms of the GNU General Public License * modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version * as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version. * 2 of the License, or (at your option) any later version.
* *
* Neither Alan Cox nor CymruNet Ltd. admit liability nor provide * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
* warranty for any of this software. This material is provided * warranty for any of this software. This material is provided
* "AS-IS" and at no charge. * "AS-IS" and at no charge.
* *
* (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk> * (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>
* *
...@@ -39,9 +39,13 @@ ...@@ -39,9 +39,13 @@
#include <asm/io.h> #include <asm/io.h>
#include <asm/uaccess.h> #include <asm/uaccess.h>
#define WATCHDOG_NAME "Wafer 5823 WDT"
#define PFX WATCHDOG_NAME ": "
#define WD_TIMO 60 /* 60 sec default timeout */
static unsigned long wafwdt_is_open; static unsigned long wafwdt_is_open;
static char expect_close;
static spinlock_t wafwdt_lock; static spinlock_t wafwdt_lock;
static int expect_close = 0;
/* /*
* You must set these - there is no sane way to probe for this board. * You must set these - there is no sane way to probe for this board.
...@@ -52,11 +56,17 @@ static int expect_close = 0; ...@@ -52,11 +56,17 @@ static int expect_close = 0;
* to restart it again. * to restart it again.
*/ */
#define WDT_START 0x443 static int wdt_stop = 0x843;
#define WDT_STOP 0x843 module_param(wdt_stop, int, 0);
MODULE_PARM_DESC(wdt_stop, "Wafer 5823 WDT 'stop' io port (default 0x843)");
static int wdt_start = 0x443;
module_param(wdt_start, int, 0);
MODULE_PARM_DESC(wdt_start, "Wafer 5823 WDT 'start' io port (default 0x443)");
#define WD_TIMO 60 /* 1 minute */ static int timeout = WD_TIMO; /* in seconds */
static int wd_margin = WD_TIMO; module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. 1<= timeout <=255, default=" __MODULE_STRING(WD_TIMO) ".");
#ifdef CONFIG_WATCHDOG_NOWAYOUT #ifdef CONFIG_WATCHDOG_NOWAYOUT
static int nowayout = 1; static int nowayout = 1;
...@@ -70,24 +80,24 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CON ...@@ -70,24 +80,24 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CON
static void wafwdt_ping(void) static void wafwdt_ping(void)
{ {
/* pat watchdog */ /* pat watchdog */
spin_lock(&wafwdt_lock); spin_lock(&wafwdt_lock);
inb_p(WDT_STOP); inb_p(wdt_stop);
inb_p(WDT_START); inb_p(wdt_start);
spin_unlock(&wafwdt_lock); spin_unlock(&wafwdt_lock);
} }
static void wafwdt_start(void) static void wafwdt_start(void)
{ {
/* start up watchdog */ /* start up watchdog */
outb_p(wd_margin, WDT_START); outb_p(timeout, wdt_start);
inb_p(WDT_START); inb_p(wdt_start);
} }
static void static void
wafwdt_stop(void) wafwdt_stop(void)
{ {
/* stop watchdog */ /* stop watchdog */
inb_p(WDT_STOP); inb_p(wdt_stop);
} }
static ssize_t wafwdt_write(struct file *file, const char *buf, size_t count, loff_t * ppos) static ssize_t wafwdt_write(struct file *file, const char *buf, size_t count, loff_t * ppos)
...@@ -96,6 +106,7 @@ static ssize_t wafwdt_write(struct file *file, const char *buf, size_t count, lo ...@@ -96,6 +106,7 @@ static ssize_t wafwdt_write(struct file *file, const char *buf, size_t count, lo
if (ppos != &file->f_pos) if (ppos != &file->f_pos)
return -ESPIPE; return -ESPIPE;
/* See if we got the magic character 'V' and reload the timer */
if (count) { if (count) {
if (!nowayout) { if (!nowayout) {
size_t i; size_t i;
...@@ -103,30 +114,30 @@ static ssize_t wafwdt_write(struct file *file, const char *buf, size_t count, lo ...@@ -103,30 +114,30 @@ static ssize_t wafwdt_write(struct file *file, const char *buf, size_t count, lo
/* In case it was set long ago */ /* In case it was set long ago */
expect_close = 0; expect_close = 0;
/* scan to see wether or not we got the magic character */
for (i = 0; i != count; i++) { for (i = 0; i != count; i++) {
char c; char c;
if (get_user(c, buf + i)) if (get_user(c, buf + i))
return -EFAULT; return -EFAULT;
if (c == 'V') if (c == 'V')
expect_close = 1; expect_close = 42;
} }
} }
/* Well, anyhow someone wrote to us, we should return that favour */
wafwdt_ping(); wafwdt_ping();
return 1;
} }
return 0; return count;
} }
static int wafwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, static int wafwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg) unsigned long arg)
{ {
int new_margin; int new_timeout;
static struct watchdog_info ident = { static struct watchdog_info ident = {
.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
.firmware_version = 1, .firmware_version = 1,
.identity = "Wafer 5823 WDT" .identity = "Wafer 5823 WDT",
}; };
int one=1;
switch (cmd) { switch (cmd) {
case WDIOC_GETSUPPORT: case WDIOC_GETSUPPORT:
...@@ -136,25 +147,44 @@ static int wafwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd ...@@ -136,25 +147,44 @@ static int wafwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd
break; break;
case WDIOC_GETSTATUS: case WDIOC_GETSTATUS:
if (copy_to_user((int *) arg, &one, sizeof (int))) case WDIOC_GETBOOTSTATUS:
return -EFAULT; return put_user(0, (int *)arg);
break;
case WDIOC_KEEPALIVE: case WDIOC_KEEPALIVE:
wafwdt_ping(); wafwdt_ping();
break; break;
case WDIOC_SETTIMEOUT: case WDIOC_SETTIMEOUT:
if (get_user(new_margin, (int *)arg)) if (get_user(new_timeout, (int *)arg))
return -EFAULT; return -EFAULT;
if ((new_margin < 1) || (new_margin > 255)) if ((new_timeout < 1) || (new_timeout > 255))
return -EINVAL; return -EINVAL;
wd_margin = new_margin; timeout = new_timeout;
wafwdt_stop(); wafwdt_stop();
wafwdt_start(); wafwdt_start();
/* Fall */ /* Fall */
case WDIOC_GETTIMEOUT: case WDIOC_GETTIMEOUT:
return put_user(wd_margin, (int *)arg); return put_user(timeout, (int *)arg);
case WDIOC_SETOPTIONS:
{
int options, retval = -EINVAL;
if (get_user(options, (int *)arg))
return -EFAULT;
if (options & WDIOS_DISABLECARD) {
wafwdt_start();
retval = 0;
}
if (options & WDIOS_ENABLECARD) {
wafwdt_stop();
retval = 0;
}
return retval;
}
default: default:
return -ENOTTY; return -ENOTTY;
...@@ -166,6 +196,10 @@ static int wafwdt_open(struct inode *inode, struct file *file) ...@@ -166,6 +196,10 @@ static int wafwdt_open(struct inode *inode, struct file *file)
{ {
if (test_and_set_bit(0, &wafwdt_is_open)) if (test_and_set_bit(0, &wafwdt_is_open))
return -EBUSY; return -EBUSY;
/*
* Activate
*/
wafwdt_start(); wafwdt_start();
return 0; return 0;
} }
...@@ -173,12 +207,14 @@ static int wafwdt_open(struct inode *inode, struct file *file) ...@@ -173,12 +207,14 @@ static int wafwdt_open(struct inode *inode, struct file *file)
static int static int
wafwdt_close(struct inode *inode, struct file *file) wafwdt_close(struct inode *inode, struct file *file)
{ {
clear_bit(0, &wafwdt_is_open); if (expect_close == 42) {
if (expect_close) {
wafwdt_stop(); wafwdt_stop();
} else { } else {
printk(KERN_CRIT "WDT device closed unexpectedly. WDT will not stop!\n"); printk(KERN_CRIT PFX "WDT device closed unexpectedly. WDT will not stop!\n");
wafwdt_ping();
} }
clear_bit(0, &wafwdt_is_open);
expect_close = 0;
return 0; return 0;
} }
...@@ -201,6 +237,7 @@ static int wafwdt_notify_sys(struct notifier_block *this, unsigned long code, vo ...@@ -201,6 +237,7 @@ static int wafwdt_notify_sys(struct notifier_block *this, unsigned long code, vo
static struct file_operations wafwdt_fops = { static struct file_operations wafwdt_fops = {
.owner = THIS_MODULE, .owner = THIS_MODULE,
.llseek = no_llseek,
.write = wafwdt_write, .write = wafwdt_write,
.ioctl = wafwdt_ioctl, .ioctl = wafwdt_ioctl,
.open = wafwdt_open, .open = wafwdt_open,
...@@ -210,53 +247,93 @@ static struct file_operations wafwdt_fops = { ...@@ -210,53 +247,93 @@ static struct file_operations wafwdt_fops = {
static struct miscdevice wafwdt_miscdev = { static struct miscdevice wafwdt_miscdev = {
.minor = WATCHDOG_MINOR, .minor = WATCHDOG_MINOR,
.name = "watchdog", .name = "watchdog",
.fops = &wafwdt_fops .fops = &wafwdt_fops,
}; };
/* /*
* The WDT needs to learn about soft shutdowns in order to * The WDT needs to learn about soft shutdowns in order to
* turn the timebomb registers off. * turn the timebomb registers off.
*/ */
static struct notifier_block wafwdt_notifier = { static struct notifier_block wafwdt_notifier = {
.notifier_call = wafwdt_notify_sys, .notifier_call = wafwdt_notify_sys,
.next = NULL, .next = NULL,
.priority = 0 .priority = 0,
}; };
static int __init wafwdt_init(void) static int __init wafwdt_init(void)
{ {
int ret;
printk(KERN_INFO "WDT driver for Wafer 5823 single board computer initialising.\n"); printk(KERN_INFO "WDT driver for Wafer 5823 single board computer initialising.\n");
spin_lock_init(&wafwdt_lock); spin_lock_init(&wafwdt_lock);
if(!request_region(WDT_STOP, 1, "Wafer 5823 WDT"))
goto error; if (timeout < 1 || timeout > 63) {
if(!request_region(WDT_START, 1, "Wafer 5823 WDT")) timeout = WD_TIMO;
printk (KERN_INFO PFX "timeout value must be 1<=x<=255, using %d\n",
timeout);
}
if (wdt_stop != wdt_start) {
if(!request_region(wdt_stop, 1, "Wafer 5823 WDT")) {
printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
wdt_stop);
ret = -EIO;
goto error;
}
}
if(!request_region(wdt_start, 1, "Wafer 5823 WDT")) {
printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
wdt_start);
ret = -EIO;
goto error2; goto error2;
if(misc_register(&wafwdt_miscdev)<0) }
ret = register_reboot_notifier(&wafwdt_notifier);
if (ret != 0) {
printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
ret);
goto error3; goto error3;
register_reboot_notifier(&wafwdt_notifier); }
return 0;
ret = misc_register(&wafwdt_miscdev);
if (ret != 0) {
printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, ret);
goto error4;
}
printk (KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n",
timeout, nowayout);
return ret;
error4:
unregister_reboot_notifier(&wafwdt_notifier);
error3: error3:
release_region(WDT_START, 1); release_region(wdt_start, 1);
error2: error2:
release_region(WDT_STOP, 1); if (wdt_stop != wdt_start)
release_region(wdt_stop, 1);
error: error:
return -ENODEV; return ret;
} }
static void __exit wafwdt_exit(void) static void __exit wafwdt_exit(void)
{ {
misc_deregister(&wafwdt_miscdev); misc_deregister(&wafwdt_miscdev);
unregister_reboot_notifier(&wafwdt_notifier); unregister_reboot_notifier(&wafwdt_notifier);
release_region(WDT_STOP, 1); if(wdt_stop != wdt_start)
release_region(WDT_START, 1); release_region(wdt_stop, 1);
release_region(wdt_start, 1);
} }
module_init(wafwdt_init); module_init(wafwdt_init);
module_exit(wafwdt_exit); module_exit(wafwdt_exit);
MODULE_AUTHOR("Justin Cormack"); MODULE_AUTHOR("Justin Cormack");
MODULE_DESCRIPTION("ICP Wafer 5823 Single Board Computer WDT driver");
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");
/* end of wafer5823wdt.c */ /* end of wafer5823wdt.c */
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment