static int wdt_open(struct inode *inode, struct file *file)
{
/* Allow only one person to hold it open */
if (access)
return -EBUSY;
if (nowayout)
__module_get(THIS_MODULE);
/* Activate timer */
wdt_reset_counter();
wdt_set_timeout();
printk(KERN_INFO NAME ": enabling watchdog timer\n");
access = 1;
return 0;
}
void wdt_test(unsigned int seconds, unsigned int reset_int)
{
// wdt 13Mhz
*(VUINT_T *)0xD4050200 = 0x7;
udelay(10);
*(VUINT_T *)0xD4050200 = 0x3;
udelay(100);
*(VUINT_T *)0xD4051020 |= 0x10;
wdt_reset_counter();
// the wdt timer seems only use 256hz
// see the emei register TimersCP section for details
wdt_set_match(seconds * 256);
wdt_enable(reset_int);
printf("-------- wdt rest --------------\n");
while (1);
}
static ssize_t wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos)
{
/* Refresh the timer. */
if (len) {
if (!nowayout) {
size_t i;
/* In case it was set long ago */
expect_close = 0;
for (i = 0; i != len; i++) {
char c;
if (get_user(c, data + i))
return -EFAULT;
if (c == 'V')
expect_close = 1;
}
}
wdt_reset_counter();
return len;
}
return 0;
}
static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
int new_timeout;
static struct watchdog_info ident = {
.options = WDIOF_SETTIMEOUT |
WDIOF_KEEPALIVEPING |
WDIOF_MAGICCLOSE,
.firmware_version = 0,
.identity = "ADM5120_WDT Watchdog",
};
switch (cmd) {
default:
return -ENOTTY;
case WDIOC_GETSUPPORT:
if (copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident)))
return -EFAULT;
return 0;
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
return put_user(0, (int *)arg);
case WDIOC_KEEPALIVE:
wdt_reset_counter();
return 0;
case WDIOC_SETTIMEOUT:
if (get_user(new_timeout, (int *)arg))
return -EFAULT;
if (new_timeout < 1)
return -EINVAL;
if (new_timeout > MAX_TIMEOUT)
return -EINVAL;
timeout = new_timeout;
wdt_set_timeout();
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(timeout, (int *)arg);
}
}
static const struct file_operations wdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = wdt_write,
.unlocked_ioctl = wdt_ioctl,
.open = wdt_open,
.release = wdt_release,
};
static struct miscdevice wdt_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
.fops = &wdt_fops,
};
static char banner[] __initdata = KERN_INFO NAME ": Watchdog Timer version " VERSION "\n";
static int __init watchdog_init(void)
{
int ret;
ret = misc_register(&wdt_miscdev);
if (ret)
return ret;
wdt_disable();
printk(banner);
return 0;
}
static void __exit watchdog_exit(void)
{
misc_deregister(&wdt_miscdev);
}
