-/*
- * Handle commands from user-space.
- */
-static long at91_wdt_ioctl(struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- void __user *argp = (void __user *)arg;
- int __user *p = argp;
- int new_value;
-
- switch (cmd) {
- case WDIOC_GETSUPPORT:
- return copy_to_user(argp, &at91_wdt_info,
- sizeof(at91_wdt_info)) ? -EFAULT : 0;
-
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- return put_user(0, p);
-
- case WDIOC_KEEPALIVE:
- at91wdt_private.next_heartbeat = jiffies + heartbeat * HZ;
- return 0;
-
- case WDIOC_SETTIMEOUT:
- if (get_user(new_value, p))
- return -EFAULT;
-
- heartbeat = new_value;
- at91wdt_private.next_heartbeat = jiffies + heartbeat * HZ;
-
- return put_user(new_value, p); /* return current value */
-
- case WDIOC_GETTIMEOUT:
- return put_user(heartbeat, p);
- }
- return -ENOTTY;
-}
-
-/*
- * Pat the watchdog whenever device is written to.
- */
-static ssize_t at91_wdt_write(struct file *file, const char *data, size_t len,
- loff_t *ppos)
-{
- if (!len)
- return 0;
-
- /* Scan for magic character */
- if (!nowayout) {
- size_t i;
-
- at91wdt_private.expect_close = 0;
-
- for (i = 0; i < len; i++) {
- char c;
- if (get_user(c, data + i))
- return -EFAULT;
- if (c == 'V') {
- at91wdt_private.expect_close = 42;
- break;
- }
- }
- }
-
- at91wdt_private.next_heartbeat = jiffies + heartbeat * HZ;
-
- return len;
-}
-
-/* ......................................................................... */
-
-static const struct file_operations at91wdt_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .unlocked_ioctl = at91_wdt_ioctl,
- .open = at91_wdt_open,
- .release = at91_wdt_close,
- .write = at91_wdt_write,