watchdog: WatchDog Timer Driver Core - Add WDIOC_SETTIMEOUT and WDIOC_GETTIMEOUT ioctl

This part add's the WDIOC_SETTIMEOUT and WDIOC_GETTIMEOUT ioctl
functionality to the WatchDog Timer Driver Core framework.

Signed-off-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
index 9f5550e16ab5..2c0289deaadd 100644
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -190,6 +190,26 @@ static long watchdog_ioctl(struct file *file, unsigned int cmd,
                         return -EOPNOTSUPP;
                 watchdog_ping(wdd);
                 return 0;
+        case WDIOC_SETTIMEOUT:
+                if ((wdd->ops->set_timeout == NULL) ||
+                    !(wdd->info->options & WDIOF_SETTIMEOUT))
+                        return -EOPNOTSUPP;
+                if (get_user(val, p))
+                        return -EFAULT;
+                err = wdd->ops->set_timeout(wdd, val);
+                if (err < 0)
+                        return err;
+                wdd->timeout = val;
+                /* If the watchdog is active then we send a keepalive ping
+                 * to make sure that the watchdog keep's running (and if
+                 * possible that it takes the new timeout) */
+                watchdog_ping(wdd);
+                /* Fall */
+        case WDIOC_GETTIMEOUT:
+                /* timeout == 0 means that we don't know the timeout */
+                if (wdd->timeout == 0)
+                        return -EOPNOTSUPP;
+                return put_user(wdd->timeout, p);
         default:
                 return -ENOTTY;
         }