static int eurwdt_release(struct inode *inode, struct file *file)
{
if (minor(inode->i_rdev) == WATCHDOG_MINOR) {
#ifndef CONFIG_WATCHDOG_NOWAYOUT
eurwdt_disable_timer();
#endif
eurwdt_is_open = 0;
MOD_DEC_USE_COUNT;
}
return 0;
}
static void eurwdt_activate_timer(void)
{
eurwdt_disable_timer();
eurwdt_write_reg(WDT_CTRL_REG, 0x01); /* activate the WDT */
eurwdt_write_reg(WDT_OUTPIN_CFG, !strcmp("int", ev) ?
WDT_EVENT_INT : WDT_EVENT_REBOOT);
/* Setting interrupt line */
if (irq == 2 || irq > 15 || irq < 0) {
printk(KERN_ERR ": invalid irq number\n");
irq = 0; /* if invalid we disable interrupt */
}
if (irq == 0)
printk(KERN_INFO ": interrupt disabled\n");
eurwdt_write_reg(WDT_TIMER_CFG, irq<<4);
eurwdt_write_reg(WDT_UNIT_SEL, WDT_UNIT_SECS); /* we use seconds */
eurwdt_set_timeout(0); /* the default timeout */
}
static long eurwdt_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
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 = "WDT Eurotech CPU-1220/1410",
};
int time;
int options, retval = -EINVAL;
switch (cmd) {
case WDIOC_GETSUPPORT:
return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
return put_user(0, p);
case WDIOC_SETOPTIONS:
if (get_user(options, p))
return -EFAULT;
spin_lock(&eurwdt_lock);
if (options & WDIOS_DISABLECARD) {
eurwdt_disable_timer();
retval = 0;
}
if (options & WDIOS_ENABLECARD) {
eurwdt_activate_timer();
eurwdt_ping();
retval = 0;
}
spin_unlock(&eurwdt_lock);
return retval;
case WDIOC_KEEPALIVE:
spin_lock(&eurwdt_lock);
eurwdt_ping();
spin_unlock(&eurwdt_lock);
return 0;
case WDIOC_SETTIMEOUT:
if (copy_from_user(&time, p, sizeof(int)))
return -EFAULT;
/* Sanity check */
if (time < 0 || time > 255)
return -EINVAL;
spin_lock(&eurwdt_lock);
eurwdt_timeout = time;
eurwdt_set_timeout(time);
spin_unlock(&eurwdt_lock);
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(eurwdt_timeout, p);
default:
return -ENOTTY;
}
}
/**
* eurwdt_open:
* @inode: inode of device
* @file: file handle to device
*
* The misc device has been opened. The watchdog device is single
* open and on opening we load the counter.
*/
static int eurwdt_open(struct inode *inode, struct file *file)
{
if (test_and_set_bit(0, &eurwdt_is_open))
return -EBUSY;
eurwdt_timeout = WDT_TIMEOUT; /* initial timeout */
/* Activate the WDT */
eurwdt_activate_timer();
return nonseekable_open(inode, file);
}
/**
* eurwdt_release:
* @inode: inode to board
* @file: file handle to board
*
* The watchdog has a configurable API. There is a religious dispute
* between people who want their watchdog to be able to shut down and
* those who want to be sure if the watchdog manager dies the machine
* reboots. In the former case we disable the counters, in the latter
* case you have to open it again very soon.
*/
static int eurwdt_release(struct inode *inode, struct file *file)
{
if (eur_expect_close == 42)
eurwdt_disable_timer();
else {
printk(KERN_CRIT
"eurwdt: Unexpected close, not stopping watchdog!\n");
eurwdt_ping();
}
clear_bit(0, &eurwdt_is_open);
eur_expect_close = 0;
return 0;
}
/**
* eurwdt_notify_sys:
* @this: our notifier block
* @code: the event being reported
* @unused: unused
*
* Our notifier is called on system shutdowns. We want to turn the card
* off at reboot otherwise the machine will reboot again during memory
* test or worse yet during the following fsck. This would suck, in fact
* trust me - if it happens it does suck.
*/
static int eurwdt_notify_sys(struct notifier_block *this, unsigned long code,
void *unused)
{
if (code == SYS_DOWN || code == SYS_HALT)
eurwdt_disable_timer(); /* Turn the card off */
return NOTIFY_DONE;
}
/*
* Kernel Interfaces
*/
static const struct file_operations eurwdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = eurwdt_write,
.unlocked_ioctl = eurwdt_ioctl,
.open = eurwdt_open,
.release = eurwdt_release,
};
static struct miscdevice eurwdt_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
.fops = &eurwdt_fops,
};
/*
* The WDT card needs to learn about soft shutdowns in order to
* turn the timebomb registers off.
*/
static struct notifier_block eurwdt_notifier = {
.notifier_call = eurwdt_notify_sys,
};
/**
* cleanup_module:
*
* Unload the watchdog. You cannot do this with any file handles open.
* If your watchdog is set to continue ticking on close and you unload
* it, well it keeps ticking. We won't get the interrupt but the board
* will not touch PC memory so all is fine. You just have to load a new
* module in 60 seconds or reboot.
*/
static void __exit eurwdt_exit(void)
{
eurwdt_lock_chip();
misc_deregister(&eurwdt_miscdev);
unregister_reboot_notifier(&eurwdt_notifier);
release_region(io, 2);
free_irq(irq, NULL);
}
/**
* eurwdt_init:
*
* Set up the WDT watchdog board. After grabbing the resources
* we require we need also to unlock the device.
* The open() function will actually kick the board off.
*/
static int __init eurwdt_init(void)
{
int ret;
ret = request_irq(irq, eurwdt_interrupt, IRQF_DISABLED, "eurwdt", NULL);
if (ret) {
printk(KERN_ERR "eurwdt: IRQ %d is not free.\n", irq);
goto out;
}
if (!request_region(io, 2, "eurwdt")) {
printk(KERN_ERR "eurwdt: IO %X is not free.\n", io);
ret = -EBUSY;
goto outirq;
}
ret = register_reboot_notifier(&eurwdt_notifier);
if (ret) {
printk(KERN_ERR
"eurwdt: can't register reboot notifier (err=%d)\n", ret);
goto outreg;
}
spin_lock_init(&eurwdt_lock);
ret = misc_register(&eurwdt_miscdev);
if (ret) {
printk(KERN_ERR "eurwdt: can't misc_register on minor=%d\n",
WATCHDOG_MINOR);
goto outreboot;
}
eurwdt_unlock_chip();
ret = 0;
printk(KERN_INFO "Eurotech WDT driver 0.01 at %X (Interrupt %d)"
" - timeout event: %s\n",
io, irq, (!strcmp("int", ev) ? "int" : "reboot"));
out:
return ret;
outreboot:
unregister_reboot_notifier(&eurwdt_notifier);
outreg:
release_region(io, 2);
outirq:
free_irq(irq, NULL);
goto out;
}