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| author | Wim Van Sebroeck <wim@iguana.be> | 2011-07-22 22:56:38 +0400 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@iguana.be> | 2011-07-28 12:01:05 +0400 |
| commit | 2fa03560ab3a6dd83cad9bfd5692179fc2ceabb3 (patch) | |
| tree | b208649368917b6c8d16c5cc737b2b83e906d074 /drivers/watchdog | |
| parent | 43316044d4f64da008d6aca7d4b60771b9a24eb8 (diff) | |
| download | linux-2fa03560ab3a6dd83cad9bfd5692179fc2ceabb3.tar.xz | |
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>
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/watchdog_dev.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c index 366f49ce69b8..00a611293065 100644 --- a/drivers/watchdog/watchdog_dev.c +++ b/drivers/watchdog/watchdog_dev.c @@ -95,6 +95,37 @@ static ssize_t watchdog_write(struct file *file, const char __user *data, } /* + * watchdog_ioctl: handle the different ioctl's for the watchdog device. + * @file: file handle to the device + * @cmd: watchdog command + * @arg: argument pointer + * + * The watchdog API defines a common set of functions for all watchdogs + * according to their available features. + */ + +static long watchdog_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + void __user *argp = (void __user *)arg; + int __user *p = argp; + unsigned int val; + + switch (cmd) { + case WDIOC_GETSUPPORT: + return copy_to_user(argp, wdd->info, + sizeof(struct watchdog_info)) ? -EFAULT : 0; + case WDIOC_GETSTATUS: + val = wdd->ops->status ? wdd->ops->status(wdd) : 0; + return put_user(val, p); + case WDIOC_GETBOOTSTATUS: + return put_user(wdd->bootstatus, p); + default: + return -ENOTTY; + } +} + +/* * watchdog_open: open the /dev/watchdog device. * @inode: inode of device * @file: file handle to device @@ -163,6 +194,7 @@ static int watchdog_release(struct inode *inode, struct file *file) static const struct file_operations watchdog_fops = { .owner = THIS_MODULE, .write = watchdog_write, + .unlocked_ioctl = watchdog_ioctl, .open = watchdog_open, .release = watchdog_release, }; |