forked from luck/tmp_suning_uos_patched
watchdog: WatchDog Timer Driver Core - Add basic ioctl functionality
This part add's the basic ioctl functionality to the WatchDog Timer Driver Core framework. The supported ioctl call's are: WDIOC_GETSUPPORT WDIOC_GETSTATUS WDIOC_GETBOOTSTATUS 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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@ -41,6 +41,7 @@ The watchdog device structure looks like this:
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struct watchdog_device {
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const struct watchdog_info *info;
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const struct watchdog_ops *ops;
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unsigned int bootstatus;
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void *driver_data;
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unsigned long status;
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};
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@ -49,6 +50,8 @@ It contains following fields:
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* info: a pointer to a watchdog_info structure. This structure gives some
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additional information about the watchdog timer itself. (Like it's unique name)
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* ops: a pointer to the list of watchdog operations that the watchdog supports.
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* bootstatus: status of the device after booting (reported with watchdog
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WDIOF_* status bits).
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* driver_data: a pointer to the drivers private data of a watchdog device.
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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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@ -65,6 +68,7 @@ struct watchdog_ops {
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int (*stop)(struct watchdog_device *);
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/* optional operations */
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int (*ping)(struct watchdog_device *);
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unsigned int (*status)(struct watchdog_device *);
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};
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It is important that you first define the module owner of the watchdog timer
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@ -97,6 +101,8 @@ they are supported. These optional routines/operations are:
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the watchdog timer driver core does: to send a keepalive ping to the watchdog
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timer hardware it will either use the ping operation (when available) or the
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start operation (when the ping operation is not available).
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* status: this routine checks the status of the watchdog timer device. The
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status of the device is reported with watchdog WDIOF_* status flags/bits.
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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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@ -94,6 +94,37 @@ static ssize_t watchdog_write(struct file *file, const char __user *data,
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return len;
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}
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/*
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* watchdog_ioctl: handle the different ioctl's for the watchdog device.
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* @file: file handle to the device
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* @cmd: watchdog command
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* @arg: argument pointer
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*
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* The watchdog API defines a common set of functions for all watchdogs
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* according to their available features.
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*/
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static long watchdog_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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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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switch (cmd) {
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case WDIOC_GETSUPPORT:
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return copy_to_user(argp, wdd->info,
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sizeof(struct watchdog_info)) ? -EFAULT : 0;
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case WDIOC_GETSTATUS:
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val = wdd->ops->status ? wdd->ops->status(wdd) : 0;
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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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default:
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return -ENOTTY;
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}
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}
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/*
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* watchdog_open: open the /dev/watchdog device.
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* @inode: inode of device
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@ -163,6 +194,7 @@ static int watchdog_release(struct inode *inode, struct file *file)
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static const struct file_operations watchdog_fops = {
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.owner = THIS_MODULE,
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.write = watchdog_write,
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.unlocked_ioctl = watchdog_ioctl,
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.open = watchdog_open,
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.release = watchdog_release,
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};
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@ -68,6 +68,7 @@ struct watchdog_device;
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* @start: The routine for starting the watchdog device.
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* @stop: The routine for stopping the watchdog device.
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* @ping: The routine that sends a keepalive ping to the watchdog device.
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* @status: The routine that shows the status of the watchdog device.
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*
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* The watchdog_ops structure contains a list of low-level operations
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* that control a watchdog device. It also contains the module that owns
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@ -81,12 +82,14 @@ struct watchdog_ops {
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int (*stop)(struct watchdog_device *);
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/* optional operations */
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int (*ping)(struct watchdog_device *);
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unsigned int (*status)(struct watchdog_device *);
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};
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/** struct watchdog_device - The structure that defines a watchdog device
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*
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* @info: Pointer to a watchdog_info structure.
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* @ops: Pointer to the list of watchdog operations.
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* @bootstatus: Status of the watchdog device at boot.
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* @driver-data:Pointer to the drivers private data.
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* @status: Field that contains the devices internal status bits.
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*
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@ -99,6 +102,7 @@ struct watchdog_ops {
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struct watchdog_device {
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const struct watchdog_info *info;
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const struct watchdog_ops *ops;
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unsigned int bootstatus;
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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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