2 * Generic watchdog defines. Derived from..
4 * Berkshire PC Watchdog Defines
5 * by Ken Hollis <khollis@bitgate.com>
9 #ifndef _LINUX_WATCHDOG_H
10 #define _LINUX_WATCHDOG_H
12 #include <linux/ioctl.h>
13 #include <linux/types.h>
15 #define WATCHDOG_IOCTL_BASE 'W'
17 struct watchdog_info
{
18 __u32 options
; /* Options the card/driver supports */
19 __u32 firmware_version
; /* Firmware version of the card */
20 __u8 identity
[32]; /* Identity of the board */
23 #define WDIOC_GETSUPPORT _IOR(WATCHDOG_IOCTL_BASE, 0, struct watchdog_info)
24 #define WDIOC_GETSTATUS _IOR(WATCHDOG_IOCTL_BASE, 1, int)
25 #define WDIOC_GETBOOTSTATUS _IOR(WATCHDOG_IOCTL_BASE, 2, int)
26 #define WDIOC_GETTEMP _IOR(WATCHDOG_IOCTL_BASE, 3, int)
27 #define WDIOC_SETOPTIONS _IOR(WATCHDOG_IOCTL_BASE, 4, int)
28 #define WDIOC_KEEPALIVE _IOR(WATCHDOG_IOCTL_BASE, 5, int)
29 #define WDIOC_SETTIMEOUT _IOWR(WATCHDOG_IOCTL_BASE, 6, int)
30 #define WDIOC_GETTIMEOUT _IOR(WATCHDOG_IOCTL_BASE, 7, int)
31 #define WDIOC_SETPRETIMEOUT _IOWR(WATCHDOG_IOCTL_BASE, 8, int)
32 #define WDIOC_GETPRETIMEOUT _IOR(WATCHDOG_IOCTL_BASE, 9, int)
33 #define WDIOC_GETTIMELEFT _IOR(WATCHDOG_IOCTL_BASE, 10, int)
35 #define WDIOF_UNKNOWN -1 /* Unknown flag error */
36 #define WDIOS_UNKNOWN -1 /* Unknown status error */
38 #define WDIOF_OVERHEAT 0x0001 /* Reset due to CPU overheat */
39 #define WDIOF_FANFAULT 0x0002 /* Fan failed */
40 #define WDIOF_EXTERN1 0x0004 /* External relay 1 */
41 #define WDIOF_EXTERN2 0x0008 /* External relay 2 */
42 #define WDIOF_POWERUNDER 0x0010 /* Power bad/power fault */
43 #define WDIOF_CARDRESET 0x0020 /* Card previously reset the CPU */
44 #define WDIOF_POWEROVER 0x0040 /* Power over voltage */
45 #define WDIOF_SETTIMEOUT 0x0080 /* Set timeout (in seconds) */
46 #define WDIOF_MAGICCLOSE 0x0100 /* Supports magic close char */
47 #define WDIOF_PRETIMEOUT 0x0200 /* Pretimeout (in seconds), get/set */
48 #define WDIOF_KEEPALIVEPING 0x8000 /* Keep alive ping reply */
50 #define WDIOS_DISABLECARD 0x0001 /* Turn off the watchdog timer */
51 #define WDIOS_ENABLECARD 0x0002 /* Turn on the watchdog timer */
52 #define WDIOS_TEMPPANIC 0x0004 /* Kernel panic on temperature trip */
56 #ifdef CONFIG_WATCHDOG_NOWAYOUT
57 #define WATCHDOG_NOWAYOUT 1
59 #define WATCHDOG_NOWAYOUT 0
63 struct watchdog_device
;
65 /** struct watchdog_ops - The watchdog-devices operations
67 * @owner: The module owner.
68 * @start: The routine for starting the watchdog device.
69 * @stop: The routine for stopping the watchdog device.
70 * @ping: The routine that sends a keepalive ping to the watchdog device.
71 * @status: The routine that shows the status of the watchdog device.
72 * @set_timeout:The routine for setting the watchdog devices timeout value.
73 * @ioctl: The routines that handles extra ioctl calls.
75 * The watchdog_ops structure contains a list of low-level operations
76 * that control a watchdog device. It also contains the module that owns
77 * these operations. The start and stop function are mandatory, all other
78 * functions are optonal.
82 /* mandatory operations */
83 int (*start
)(struct watchdog_device
*);
84 int (*stop
)(struct watchdog_device
*);
85 /* optional operations */
86 int (*ping
)(struct watchdog_device
*);
87 unsigned int (*status
)(struct watchdog_device
*);
88 int (*set_timeout
)(struct watchdog_device
*, unsigned int);
89 long (*ioctl
)(struct watchdog_device
*, unsigned int, unsigned long);
92 /** struct watchdog_device - The structure that defines a watchdog device
94 * @info: Pointer to a watchdog_info structure.
95 * @ops: Pointer to the list of watchdog operations.
96 * @bootstatus: Status of the watchdog device at boot.
97 * @timeout: The watchdog devices timeout value.
98 * @min_timeout:The watchdog devices minimum timeout value.
99 * @max_timeout:The watchdog devices maximum timeout value.
100 * @driver-data:Pointer to the drivers private data.
101 * @status: Field that contains the devices internal status bits.
103 * The watchdog_device structure contains all information about a
104 * watchdog timer device.
106 * The driver-data field may not be accessed directly. It must be accessed
107 * via the watchdog_set_drvdata and watchdog_get_drvdata helpers.
109 struct watchdog_device
{
110 const struct watchdog_info
*info
;
111 const struct watchdog_ops
*ops
;
112 unsigned int bootstatus
;
113 unsigned int timeout
;
114 unsigned int min_timeout
;
115 unsigned int max_timeout
;
117 unsigned long status
;
118 /* Bit numbers for status flags */
119 #define WDOG_ACTIVE 0 /* Is the watchdog running/active */
120 #define WDOG_DEV_OPEN 1 /* Opened via /dev/watchdog ? */
121 #define WDOG_ALLOW_RELEASE 2 /* Did we receive the magic char ? */
122 #define WDOG_NO_WAY_OUT 3 /* Is 'nowayout' feature set ? */
125 /* Use the following functions to manipulate watchdog driver specific data */
126 static inline void watchdog_set_drvdata(struct watchdog_device
*wdd
, void *data
)
128 wdd
->driver_data
= data
;
131 static inline void *watchdog_get_drvdata(struct watchdog_device
*wdd
)
133 return wdd
->driver_data
;
136 /* drivers/watchdog/core/watchdog_core.c */
137 extern int watchdog_register_device(struct watchdog_device
*);
138 extern void watchdog_unregister_device(struct watchdog_device
*);
140 #endif /* __KERNEL__ */
142 #endif /* ifndef _LINUX_WATCHDOG_H */