mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 12:43:55 +08:00
607ca46e97
Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Michael Kerrisk <mtk.manpages@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Dave Jones <davej@redhat.com>
137 lines
4.6 KiB
C
137 lines
4.6 KiB
C
/*
|
|
* Generic watchdog defines. Derived from..
|
|
*
|
|
* Berkshire PC Watchdog Defines
|
|
* by Ken Hollis <khollis@bitgate.com>
|
|
*
|
|
*/
|
|
#ifndef _LINUX_WATCHDOG_H
|
|
#define _LINUX_WATCHDOG_H
|
|
|
|
|
|
#include <linux/bitops.h>
|
|
#include <linux/device.h>
|
|
#include <linux/cdev.h>
|
|
#include <uapi/linux/watchdog.h>
|
|
|
|
struct watchdog_ops;
|
|
struct watchdog_device;
|
|
|
|
/** struct watchdog_ops - The watchdog-devices operations
|
|
*
|
|
* @owner: The module owner.
|
|
* @start: The routine for starting the watchdog device.
|
|
* @stop: The routine for stopping the watchdog device.
|
|
* @ping: The routine that sends a keepalive ping to the 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
|
|
* that control a watchdog device. It also contains the module that owns
|
|
* these operations. The start and stop function are mandatory, all other
|
|
* functions are optonal.
|
|
*/
|
|
struct watchdog_ops {
|
|
struct module *owner;
|
|
/* mandatory operations */
|
|
int (*start)(struct watchdog_device *);
|
|
int (*stop)(struct watchdog_device *);
|
|
/* optional operations */
|
|
int (*ping)(struct watchdog_device *);
|
|
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.
|
|
* @timeout: The watchdog devices timeout value.
|
|
* @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
|
|
* watchdog timer device.
|
|
*
|
|
* 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;
|
|
unsigned int timeout;
|
|
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
|
|
#define WATCHDOG_NOWAYOUT 1
|
|
#define WATCHDOG_NOWAYOUT_INIT_STATUS (1 << WDOG_NO_WAY_OUT)
|
|
#else
|
|
#define WATCHDOG_NOWAYOUT 0
|
|
#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)
|
|
{
|
|
if (nowayout)
|
|
set_bit(WDOG_NO_WAY_OUT, &wdd->status);
|
|
}
|
|
|
|
/* Use the following functions to manipulate watchdog driver specific data */
|
|
static inline void watchdog_set_drvdata(struct watchdog_device *wdd, void *data)
|
|
{
|
|
wdd->driver_data = data;
|
|
}
|
|
|
|
static inline void *watchdog_get_drvdata(struct watchdog_device *wdd)
|
|
{
|
|
return wdd->driver_data;
|
|
}
|
|
|
|
/* drivers/watchdog/core/watchdog_core.c */
|
|
extern int watchdog_register_device(struct watchdog_device *);
|
|
extern void watchdog_unregister_device(struct watchdog_device *);
|
|
|
|
#endif /* ifndef _LINUX_WATCHDOG_H */
|