diff options
Diffstat (limited to 'include/linux/watchdog.h')
| -rw-r--r-- | include/linux/watchdog.h | 88 |
1 files changed, 40 insertions, 48 deletions
diff --git a/include/linux/watchdog.h b/include/linux/watchdog.h index 43ba5b3ce2a..2a3038ee17a 100644 --- a/include/linux/watchdog.h +++ b/include/linux/watchdog.h @@ -5,55 +5,14 @@ * by Ken Hollis <khollis@bitgate.com> * */ - #ifndef _LINUX_WATCHDOG_H #define _LINUX_WATCHDOG_H -#include <linux/ioctl.h> -#include <linux/types.h> - -#define WATCHDOG_IOCTL_BASE 'W' - -struct watchdog_info { - __u32 options; /* Options the card/driver supports */ - __u32 firmware_version; /* Firmware version of the card */ - __u8 identity[32]; /* Identity of the board */ -}; - -#define WDIOC_GETSUPPORT _IOR(WATCHDOG_IOCTL_BASE, 0, struct watchdog_info) -#define WDIOC_GETSTATUS _IOR(WATCHDOG_IOCTL_BASE, 1, int) -#define WDIOC_GETBOOTSTATUS _IOR(WATCHDOG_IOCTL_BASE, 2, int) -#define WDIOC_GETTEMP _IOR(WATCHDOG_IOCTL_BASE, 3, int) -#define WDIOC_SETOPTIONS _IOR(WATCHDOG_IOCTL_BASE, 4, int) -#define WDIOC_KEEPALIVE _IOR(WATCHDOG_IOCTL_BASE, 5, int) -#define WDIOC_SETTIMEOUT _IOWR(WATCHDOG_IOCTL_BASE, 6, int) -#define WDIOC_GETTIMEOUT _IOR(WATCHDOG_IOCTL_BASE, 7, int) -#define WDIOC_SETPRETIMEOUT _IOWR(WATCHDOG_IOCTL_BASE, 8, int) -#define WDIOC_GETPRETIMEOUT _IOR(WATCHDOG_IOCTL_BASE, 9, int) -#define WDIOC_GETTIMELEFT _IOR(WATCHDOG_IOCTL_BASE, 10, int) - -#define WDIOF_UNKNOWN -1 /* Unknown flag error */ -#define WDIOS_UNKNOWN -1 /* Unknown status error */ - -#define WDIOF_OVERHEAT 0x0001 /* Reset due to CPU overheat */ -#define WDIOF_FANFAULT 0x0002 /* Fan failed */ -#define WDIOF_EXTERN1 0x0004 /* External relay 1 */ -#define WDIOF_EXTERN2 0x0008 /* External relay 2 */ -#define WDIOF_POWERUNDER 0x0010 /* Power bad/power fault */ -#define WDIOF_CARDRESET 0x0020 /* Card previously reset the CPU */ -#define WDIOF_POWEROVER 0x0040 /* Power over voltage */ -#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_KEEPALIVEPING 0x8000 /* Keep alive ping reply */ - -#define WDIOS_DISABLECARD 0x0001 /* Turn off the watchdog timer */ -#define WDIOS_ENABLECARD 0x0002 /* Turn on the watchdog timer */ -#define WDIOS_TEMPPANIC 0x0004 /* Kernel panic on temperature trip */ - -#ifdef __KERNEL__ #include <linux/bitops.h> +#include <linux/device.h> +#include <linux/cdev.h> +#include <uapi/linux/watchdog.h> struct watchdog_ops; struct watchdog_device; @@ -66,6 +25,9 @@ struct 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 @@ -82,11 +44,18 @@ struct watchdog_ops { 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. @@ -94,6 +63,7 @@ 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 @@ -101,8 +71,15 @@ 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; @@ -110,12 +87,14 @@ 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 @@ -126,13 +105,26 @@ struct watchdog_device { #define WATCHDOG_NOWAYOUT_INIT_STATUS 0 #endif +/* Use the following function to check whether 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, int nowayout) +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 function to check if a timeout value is invalid */ +static inline bool watchdog_timeout_invalid(struct watchdog_device *wdd, unsigned int t) +{ + return ((wdd->max_timeout != 0) && + (t < wdd->min_timeout || t > wdd->max_timeout)); +} + /* Use the following functions to manipulate watchdog driver specific data */ static inline void watchdog_set_drvdata(struct watchdog_device *wdd, void *data) { @@ -144,10 +136,10 @@ static inline void *watchdog_get_drvdata(struct watchdog_device *wdd) return wdd->driver_data; } -/* drivers/watchdog/core/watchdog_core.c */ +/* drivers/watchdog/watchdog_core.c */ +extern int watchdog_init_timeout(struct watchdog_device *wdd, + unsigned int timeout_parm, struct device *dev); extern int watchdog_register_device(struct watchdog_device *); extern void watchdog_unregister_device(struct watchdog_device *); -#endif /* __KERNEL__ */ - #endif /* ifndef _LINUX_WATCHDOG_H */ |