diff options
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, }; |