static int
advwdt_close(struct inode *inode, struct file *file)
{
if (adv_expect_close == 42) {
advwdt_disable();
} else {
printk(KERN_CRIT "advancetechwdt: Unexpected close, not stopping watchdog!\n");
advwdt_ping();
}
clear_bit(0, &advwdt_is_open);
adv_expect_close = 0;
return 0;
}
static int
advwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg)
{
int new_margin;
static struct watchdog_info ident = {
options: WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
firmware_version: 0,
identity: "Advantech WDT"
};
switch (cmd) {
case WDIOC_GETSUPPORT:
if (copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident)))
return -EFAULT;
break;
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
return put_user(0, (int *)arg);
case WDIOC_KEEPALIVE:
advwdt_ping();
break;
case WDIOC_SETTIMEOUT:
if (get_user(new_margin, (int *)arg))
return -EFAULT;
if ((new_margin < 1) || (new_margin > 63))
return -EINVAL;
wd_margin = new_margin;
advwdt_ping();
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(wd_margin, (int *)arg);
case WDIOC_SETOPTIONS:
{
int options, retval = -EINVAL;
if (get_user(options, (int *)arg))
return -EFAULT;
if (options & WDIOS_DISABLECARD) {
advwdt_disable();
retval = 0;
}
if (options & WDIOS_ENABLECARD) {
advwdt_ping();
retval = 0;
}
return retval;
}
default:
return -ENOTTY;
}
return 0;
}
static void advwdt_shutdown(struct platform_device *dev)
{
/* Turn the WDT off if we have a soft shutdown */
advwdt_disable();
}
static int
advwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg)
{
int new_timeout;
void __user *argp = (void __user *)arg;
int __user *p = argp;
static struct watchdog_info ident = {
.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
.firmware_version = 1,
.identity = "Advantech WDT",
};
switch (cmd) {
case WDIOC_GETSUPPORT:
if (copy_to_user(argp, &ident, sizeof(ident)))
return -EFAULT;
break;
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
return put_user(0, p);
case WDIOC_KEEPALIVE:
advwdt_ping();
break;
case WDIOC_SETTIMEOUT:
if (get_user(new_timeout, p))
return -EFAULT;
if ((new_timeout < 1) || (new_timeout > 63))
return -EINVAL;
timeout = new_timeout;
advwdt_ping();
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(timeout, p);
case WDIOC_SETOPTIONS:
{
int options, retval = -EINVAL;
if (get_user(options, p))
return -EFAULT;
if (options & WDIOS_DISABLECARD) {
advwdt_disable();
retval = 0;
}
if (options & WDIOS_ENABLECARD) {
advwdt_ping();
retval = 0;
}
return retval;
}
default:
return -ENOIOCTLCMD;
}
return 0;
}
static int
advwdt_open(struct inode *inode, struct file *file)
{
if (test_and_set_bit(0, &advwdt_is_open))
return -EBUSY;
/*
* Activate
*/
advwdt_ping();
return nonseekable_open(inode, file);
}
static int
advwdt_close(struct inode *inode, struct file *file)
{
if (adv_expect_close == 42) {
advwdt_disable();
} else {
printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
advwdt_ping();
}
clear_bit(0, &advwdt_is_open);
adv_expect_close = 0;
return 0;
}
/*
* Notifier for system down
*/
static int
advwdt_notify_sys(struct notifier_block *this, unsigned long code,
void *unused)
{
if (code == SYS_DOWN || code == SYS_HALT) {
/* Turn the WDT off */
advwdt_disable();
}
return NOTIFY_DONE;
}
/*
* Kernel Interfaces
*/
static const struct file_operations advwdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = advwdt_write,
.ioctl = advwdt_ioctl,
.open = advwdt_open,
.release = advwdt_close,
};
static struct miscdevice advwdt_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
.fops = &advwdt_fops,
};
/*
* The WDT needs to learn about soft shutdowns in order to
* turn the timebomb registers off.
*/
static struct notifier_block advwdt_notifier = {
.notifier_call = advwdt_notify_sys,
};
static int __init
advwdt_init(void)
{
int ret;
printk(KERN_INFO "WDT driver for Advantech single board computer initialising.\n");
if (timeout < 1 || timeout > 63) {
timeout = WATCHDOG_TIMEOUT;
printk (KERN_INFO PFX "timeout value must be 1<=x<=63, using %d\n",
timeout);
}
if (wdt_stop != wdt_start) {
if (!request_region(wdt_stop, 1, WATCHDOG_NAME)) {
printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
wdt_stop);
ret = -EIO;
goto out;
}
}
if (!request_region(wdt_start, 1, WATCHDOG_NAME)) {
printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
wdt_start);
ret = -EIO;
goto unreg_stop;
}
ret = register_reboot_notifier(&advwdt_notifier);
if (ret != 0) {
printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
ret);
goto unreg_regions;
}
ret = misc_register(&advwdt_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. timeout=%d sec (nowayout=%d)\n",
timeout, nowayout);
out:
return ret;
unreg_reboot:
unregister_reboot_notifier(&advwdt_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
advwdt_exit(void)
{
misc_deregister(&advwdt_miscdev);
unregister_reboot_notifier(&advwdt_notifier);
if(wdt_stop != wdt_start)
release_region(wdt_stop,1);
release_region(wdt_start,1);
}
static long advwdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
int new_timeout;
void __user *argp = (void __user *)arg;
int __user *p = argp;
static const struct watchdog_info ident = {
.options = WDIOF_KEEPALIVEPING |
WDIOF_SETTIMEOUT |
WDIOF_MAGICCLOSE,
.firmware_version = 1,
.identity = WATCHDOG_NAME,
};
switch (cmd) {
case WDIOC_GETSUPPORT:
if (copy_to_user(argp, &ident, sizeof(ident)))
return -EFAULT;
break;
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
return put_user(0, p);
case WDIOC_SETOPTIONS:
{
int options, retval = -EINVAL;
if (get_user(options, p))
return -EFAULT;
if (options & WDIOS_DISABLECARD) {
advwdt_disable();
retval = 0;
}
if (options & WDIOS_ENABLECARD) {
advwdt_ping();
retval = 0;
}
return retval;
}
case WDIOC_KEEPALIVE:
advwdt_ping();
break;
case WDIOC_SETTIMEOUT:
if (get_user(new_timeout, p))
return -EFAULT;
if (advwdt_set_heartbeat(new_timeout))
return -EINVAL;
advwdt_ping();
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(timeout, p);
default:
return -ENOTTY;
}
return 0;
}
static int advwdt_open(struct inode *inode, struct file *file)
{
if (test_and_set_bit(0, &advwdt_is_open))
return -EBUSY;
/*
* Activate
*/
advwdt_ping();
return nonseekable_open(inode, file);
}
static int advwdt_close(struct inode *inode, struct file *file)
{
if (adv_expect_close == 42) {
advwdt_disable();
} else {
pr_crit("Unexpected close, not stopping watchdog!\n");
advwdt_ping();
}
clear_bit(0, &advwdt_is_open);
adv_expect_close = 0;
return 0;
}
/*
* Kernel Interfaces
*/
static const struct file_operations advwdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = advwdt_write,
.unlocked_ioctl = advwdt_ioctl,
.open = advwdt_open,
.release = advwdt_close,
};
static struct miscdevice advwdt_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
.fops = &advwdt_fops,
};
/*
* Init & exit routines
*/
static int advwdt_probe(struct platform_device *dev)
{
int ret;
if (wdt_stop != wdt_start) {
if (!request_region(wdt_stop, 1, WATCHDOG_NAME)) {
pr_err("I/O address 0x%04x already in use\n",
wdt_stop);
ret = -EIO;
goto out;
}
}
if (!request_region(wdt_start, 1, WATCHDOG_NAME)) {
pr_err("I/O address 0x%04x already in use\n", wdt_start);
ret = -EIO;
goto unreg_stop;
}
/* Check that the heartbeat value is within it's range ;
* if not reset to the default */
if (advwdt_set_heartbeat(timeout)) {
advwdt_set_heartbeat(WATCHDOG_TIMEOUT);
pr_info("timeout value must be 1<=x<=63, using %d\n", timeout);
}
ret = misc_register(&advwdt_miscdev);
if (ret != 0) {
pr_err("cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, ret);
goto unreg_regions;
}
pr_info("initialized. timeout=%d sec (nowayout=%d)\n",
timeout, nowayout);
out:
return ret;
unreg_regions:
release_region(wdt_start, 1);
unreg_stop:
if (wdt_stop != wdt_start)
release_region(wdt_stop, 1);
goto out;
}
static int advwdt_remove(struct platform_device *dev)
{
misc_deregister(&advwdt_miscdev);
release_region(wdt_start, 1);
if (wdt_stop != wdt_start)
release_region(wdt_stop, 1);
return 0;
}
