static int dw_wdt_open(struct inode *inode, struct file *filp)
{
if (test_and_set_bit(0, &dw_wdt.in_use))
return -EBUSY;
/* Make sure we don't get unloaded. */
__module_get(THIS_MODULE);
spin_lock(&dw_wdt.lock);
if (!dw_wdt_is_enabled()) {
/*
* The watchdog is not currently enabled. Set the timeout to
* the maximum and then start it.
*/
dw_wdt_set_top(DW_WDT_MAX_TOP);
writel(WDOG_CONTROL_REG_WDT_EN_MASK,
dw_wdt.regs + WDOG_CONTROL_REG_OFFSET);
}
dw_wdt_set_next_heartbeat();
spin_unlock(&dw_wdt.lock);
return nonseekable_open(inode, filp);
}
static int dw_wdt_open(struct inode *inode, struct file *filp)
{
if (test_and_set_bit(0, &dw_wdt.in_use))
return -EBUSY;
__module_get(THIS_MODULE);
spin_lock(&dw_wdt.lock);
if (!dw_wdt_is_enabled()) {
dw_wdt_set_top(DW_WDT_MAX_TOP);
writel(WDOG_CONTROL_REG_WDT_EN_MASK,
dw_wdt.regs + WDOG_CONTROL_REG_OFFSET);
}
dw_wdt_set_next_heartbeat();
spin_unlock(&dw_wdt.lock);
return nonseekable_open(inode, filp);
}
static long dw_wdt_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
unsigned long val;
int timeout;
switch (cmd) {
case WDIOC_GETSUPPORT:
return copy_to_user((struct watchdog_info *)arg, &dw_wdt_ident,
sizeof(dw_wdt_ident)) ? -EFAULT : 0;
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
return put_user(0, (int *)arg);
case WDIOC_KEEPALIVE:
dw_wdt_set_next_heartbeat();
return 0;
case WDIOC_SETTIMEOUT:
if (get_user(val, (int __user *)arg))
return -EFAULT;
timeout = dw_wdt_set_top(val);
return put_user(timeout , (int __user *)arg);
case WDIOC_GETTIMEOUT:
return put_user(dw_wdt_get_top(), (int __user *)arg);
case WDIOC_GETTIMELEFT:
if (get_user(val, (int __user *)arg))
return -EFAULT;
return put_user(dw_wdt_time_left(), (int __user *)arg);
default:
return -ENOTTY;
}
}
