diff options
Diffstat (limited to 'include/linux/watchdog.h')
| -rw-r--r-- | include/linux/watchdog.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/include/linux/watchdog.h b/include/linux/watchdog.h index ac40716b44e9..da70f0facd2b 100644 --- a/include/linux/watchdog.h +++ b/include/linux/watchdog.h @@ -45,6 +45,8 @@ struct watchdog_info { #define WDIOF_SETTIMEOUT 0x0080 /* Set timeout (in seconds) */ #define WDIOF_MAGICCLOSE 0x0100 /* Supports magic close char */ #define WDIOF_PRETIMEOUT 0x0200 /* Pretimeout (in seconds), get/set */ +#define WDIOF_ALARMONLY 0x0400 /* Watchdog triggers a management or + other external alarm not a reboot */ #define WDIOF_KEEPALIVEPING 0x8000 /* Keep alive ping reply */ #define WDIOS_DISABLECARD 0x0001 /* Turn off the watchdog timer */ @@ -54,6 +56,8 @@ struct watchdog_info { #ifdef __KERNEL__ #include <linux/bitops.h> +#include <linux/device.h> +#include <linux/cdev.h> struct watchdog_ops; struct watchdog_device; @@ -67,6 +71,8 @@ struct watchdog_device; * @status: The routine that shows the status of the watchdog device. * @set_timeout:The routine for setting the watchdog devices timeout value. * @get_timeleft:The routine that get's the time that's left before a reset. + * @ref: The ref operation for dyn. allocated watchdog_device structs + * @unref: The unref operation for dyn. allocated watchdog_device structs * @ioctl: The routines that handles extra ioctl calls. * * The watchdog_ops structure contains a list of low-level operations @@ -84,11 +90,17 @@ struct watchdog_ops { unsigned int (*status)(struct watchdog_device *); int (*set_timeout)(struct watchdog_device *, unsigned int); unsigned int (*get_timeleft)(struct watchdog_device *); + void (*ref)(struct watchdog_device *); + void (*unref)(struct watchdog_device *); long (*ioctl)(struct watchdog_device *, unsigned int, unsigned long); }; /** struct watchdog_device - The structure that defines a watchdog device * + * @id: The watchdog's ID. (Allocated by watchdog_register_device) + * @cdev: The watchdog's Character device. + * @dev: The device for our watchdog + * @parent: The parent bus device * @info: Pointer to a watchdog_info structure. * @ops: Pointer to the list of watchdog operations. * @bootstatus: Status of the watchdog device at boot. @@ -96,6 +108,7 @@ struct watchdog_ops { * @min_timeout:The watchdog devices minimum timeout value. * @max_timeout:The watchdog devices maximum timeout value. * @driver-data:Pointer to the drivers private data. + * @lock: Lock for watchdog core internal use only. * @status: Field that contains the devices internal status bits. * * The watchdog_device structure contains all information about a @@ -103,8 +116,15 @@ struct watchdog_ops { * * The driver-data field may not be accessed directly. It must be accessed * via the watchdog_set_drvdata and watchdog_get_drvdata helpers. + * + * The lock field is for watchdog core internal use only and should not be + * touched. */ struct watchdog_device { + int id; + struct cdev cdev; + struct device *dev; + struct device *parent; const struct watchdog_info *info; const struct watchdog_ops *ops; unsigned int bootstatus; @@ -112,12 +132,14 @@ struct watchdog_device { unsigned int min_timeout; unsigned int max_timeout; void *driver_data; + struct mutex lock; unsigned long status; /* Bit numbers for status flags */ #define WDOG_ACTIVE 0 /* Is the watchdog running/active */ #define WDOG_DEV_OPEN 1 /* Opened via /dev/watchdog ? */ #define WDOG_ALLOW_RELEASE 2 /* Did we receive the magic char ? */ #define WDOG_NO_WAY_OUT 3 /* Is 'nowayout' feature set ? */ +#define WDOG_UNREGISTERED 4 /* Has the device been unregistered */ }; #ifdef CONFIG_WATCHDOG_NOWAYOUT @@ -128,6 +150,12 @@ struct watchdog_device { #define WATCHDOG_NOWAYOUT_INIT_STATUS 0 #endif +/* Use the following function to check wether or not the watchdog is active */ +static inline bool watchdog_active(struct watchdog_device *wdd) +{ + return test_bit(WDOG_ACTIVE, &wdd->status); +} + /* Use the following function to set the nowayout feature */ static inline void watchdog_set_nowayout(struct watchdog_device *wdd, bool nowayout) { |