watchdog: WatchDog Timer Driver Core - Add WDIOC_SETOPTIONS ioctl
This part add's the WDIOC_SETOPTIONS 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>
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@ -56,8 +56,9 @@ It contains following fields:
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This data should only be accessed via the watchdog_set_drvadata and
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watchdog_get_drvdata routines.
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* status: this field contains a number of status bits that give extra
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information about the status of the device (Like: is the device opened via
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the /dev/watchdog interface or not, ...).
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information about the status of the device (Like: is the watchdog timer
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running/active, is the device opened via the /dev/watchdog interface or not,
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...).
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The list of watchdog operations is defined as:
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@ -109,6 +110,10 @@ they are supported. These optional routines/operations are:
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The status bits should (preferably) be set with the set_bit and clear_bit alike
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bit-operations. The status bits that are defined are:
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* WDOG_ACTIVE: this status bit indicates whether or not a watchdog timer device
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is active or not. When the watchdog is active after booting, then you should
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set this status bit (Note: when you register the watchdog timer device with
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this bit set, then opening /dev/watchdog will skip the start operation)
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* WDOG_DEV_OPEN: this status bit shows whether or not the watchdog device
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was opened via /dev/watchdog.
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(This bit should only be used by the WatchDog Timer Driver Core).
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@ -54,14 +54,64 @@ static struct watchdog_device *wdd;
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* If the watchdog has no own ping operation then it needs to be
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* restarted via the start operation. This wrapper function does
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* exactly that.
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* We only ping when the watchdog device is running.
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*/
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static int watchdog_ping(struct watchdog_device *wddev)
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{
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if (wddev->ops->ping)
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return wddev->ops->ping(wddev); /* ping the watchdog */
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else
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return wddev->ops->start(wddev); /* restart the watchdog */
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if (test_bit(WDOG_ACTIVE, &wdd->status)) {
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if (wddev->ops->ping)
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return wddev->ops->ping(wddev); /* ping the watchdog */
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else
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return wddev->ops->start(wddev); /* restart watchdog */
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}
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return 0;
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}
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/*
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* watchdog_start: wrapper to start the watchdog.
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* @wddev: the watchdog device to start
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*
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* Start the watchdog if it is not active and mark it active.
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* This function returns zero on success or a negative errno code for
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* failure.
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*/
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static int watchdog_start(struct watchdog_device *wddev)
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{
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int err;
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if (!test_bit(WDOG_ACTIVE, &wdd->status)) {
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err = wddev->ops->start(wddev);
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if (err < 0)
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return err;
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set_bit(WDOG_ACTIVE, &wdd->status);
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}
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return 0;
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}
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/*
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* watchdog_stop: wrapper to stop the watchdog.
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* @wddev: the watchdog device to stop
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*
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* Stop the watchdog if it is still active and unmark it active.
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* This function returns zero on success or a negative errno code for
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* failure.
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*/
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static int watchdog_stop(struct watchdog_device *wddev)
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{
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int err;
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if (test_bit(WDOG_ACTIVE, &wdd->status)) {
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err = wddev->ops->stop(wddev);
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if (err < 0)
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return err;
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clear_bit(WDOG_ACTIVE, &wdd->status);
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}
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return 0;
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}
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/*
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@ -110,6 +160,7 @@ static long watchdog_ioctl(struct file *file, unsigned int cmd,
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void __user *argp = (void __user *)arg;
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int __user *p = argp;
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unsigned int val;
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int err;
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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@ -120,6 +171,20 @@ static long watchdog_ioctl(struct file *file, unsigned int cmd,
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return put_user(val, p);
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case WDIOC_GETBOOTSTATUS:
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return put_user(wdd->bootstatus, p);
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case WDIOC_SETOPTIONS:
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if (get_user(val, p))
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return -EFAULT;
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if (val & WDIOS_DISABLECARD) {
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err = watchdog_stop(wdd);
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if (err < 0)
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return err;
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}
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if (val & WDIOS_ENABLECARD) {
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err = watchdog_start(wdd);
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if (err < 0)
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return err;
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}
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return 0;
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case WDIOC_KEEPALIVE:
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if (!(wdd->info->options & WDIOF_KEEPALIVEPING))
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return -EOPNOTSUPP;
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@ -155,7 +220,7 @@ static int watchdog_open(struct inode *inode, struct file *file)
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if (!try_module_get(wdd->ops->owner))
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goto out;
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err = wdd->ops->start(wdd);
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err = watchdog_start(wdd);
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if (err < 0)
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goto out_mod;
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@ -181,8 +246,8 @@ static int watchdog_release(struct inode *inode, struct file *file)
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{
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int err;
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err = wdd->ops->stop(wdd);
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if (err != 0) {
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err = watchdog_stop(wdd);
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if (err < 0) {
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pr_crit("%s: watchdog did not stop!\n", wdd->info->identity);
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watchdog_ping(wdd);
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}
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@ -106,6 +106,7 @@ struct watchdog_device {
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void *driver_data;
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unsigned long status;
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/* Bit numbers for status flags */
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#define WDOG_ACTIVE 0 /* Is the watchdog running/active */
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#define WDOG_DEV_OPEN 1 /* Opened via /dev/watchdog ? */
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};
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