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1/*
2 * Generic watchdog defines. Derived from..
3 *
4 * Berkshire PC Watchdog Defines
5 * by Ken Hollis <khollis@bitgate.com>
6 *
7 */
8
9#ifndef _LINUX_WATCHDOG_H
10#define _LINUX_WATCHDOG_H
11
12#include <linux/ioctl.h>
13#include <linux/types.h>
14
15#define WATCHDOG_IOCTL_BASE 'W'
16
17struct 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 */
21};
22
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)
34
35#define WDIOF_UNKNOWN -1 /* Unknown flag error */
36#define WDIOS_UNKNOWN -1 /* Unknown status error */
37
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 */
49
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 */
53
54#ifdef __KERNEL__
55
56#include <linux/bitops.h>
57
58struct watchdog_ops;
59struct watchdog_device;
60
61/** struct watchdog_ops - The watchdog-devices operations
62 *
63 * @owner: The module owner.
64 * @start: The routine for starting the watchdog device.
65 * @stop: The routine for stopping the watchdog device.
66 * @ping: The routine that sends a keepalive ping to the watchdog device.
67 * @status: The routine that shows the status of the watchdog device.
68 * @set_timeout:The routine for setting the watchdog devices timeout value.
69 * @get_timeleft:The routine that get's the time that's left before a reset.
70 * @ioctl: The routines that handles extra ioctl calls.
71 *
72 * The watchdog_ops structure contains a list of low-level operations
73 * that control a watchdog device. It also contains the module that owns
74 * these operations. The start and stop function are mandatory, all other
75 * functions are optonal.
76 */
77struct watchdog_ops {
78 struct module *owner;
79 /* mandatory operations */
80 int (*start)(struct watchdog_device *);
81 int (*stop)(struct watchdog_device *);
82 /* optional operations */
83 int (*ping)(struct watchdog_device *);
84 unsigned int (*status)(struct watchdog_device *);
85 int (*set_timeout)(struct watchdog_device *, unsigned int);
86 unsigned int (*get_timeleft)(struct watchdog_device *);
87 long (*ioctl)(struct watchdog_device *, unsigned int, unsigned long);
88};
89
90/** struct watchdog_device - The structure that defines a watchdog device
91 *
92 * @info: Pointer to a watchdog_info structure.
93 * @ops: Pointer to the list of watchdog operations.
94 * @bootstatus: Status of the watchdog device at boot.
95 * @timeout: The watchdog devices timeout value.
96 * @min_timeout:The watchdog devices minimum timeout value.
97 * @max_timeout:The watchdog devices maximum timeout value.
98 * @driver-data:Pointer to the drivers private data.
99 * @status: Field that contains the devices internal status bits.
100 *
101 * The watchdog_device structure contains all information about a
102 * watchdog timer device.
103 *
104 * The driver-data field may not be accessed directly. It must be accessed
105 * via the watchdog_set_drvdata and watchdog_get_drvdata helpers.
106 */
107struct watchdog_device {
108 const struct watchdog_info *info;
109 const struct watchdog_ops *ops;
110 unsigned int bootstatus;
111 unsigned int timeout;
112 unsigned int min_timeout;
113 unsigned int max_timeout;
114 void *driver_data;
115 unsigned long status;
116/* Bit numbers for status flags */
117#define WDOG_ACTIVE 0 /* Is the watchdog running/active */
118#define WDOG_DEV_OPEN 1 /* Opened via /dev/watchdog ? */
119#define WDOG_ALLOW_RELEASE 2 /* Did we receive the magic char ? */
120#define WDOG_NO_WAY_OUT 3 /* Is 'nowayout' feature set ? */
121};
122
123#ifdef CONFIG_WATCHDOG_NOWAYOUT
124#define WATCHDOG_NOWAYOUT 1
125#define WATCHDOG_NOWAYOUT_INIT_STATUS (1 << WDOG_NO_WAY_OUT)
126#else
127#define WATCHDOG_NOWAYOUT 0
128#define WATCHDOG_NOWAYOUT_INIT_STATUS 0
129#endif
130
131/* Use the following function to set the nowayout feature */
132static inline void watchdog_set_nowayout(struct watchdog_device *wdd, bool nowayout)
133{
134 if (nowayout)
135 set_bit(WDOG_NO_WAY_OUT, &wdd->status);
136}
137
138/* Use the following functions to manipulate watchdog driver specific data */
139static inline void watchdog_set_drvdata(struct watchdog_device *wdd, void *data)
140{
141 wdd->driver_data = data;
142}
143
144static inline void *watchdog_get_drvdata(struct watchdog_device *wdd)
145{
146 return wdd->driver_data;
147}
148
149/* drivers/watchdog/core/watchdog_core.c */
150extern int watchdog_register_device(struct watchdog_device *);
151extern void watchdog_unregister_device(struct watchdog_device *);
152
153#endif /* __KERNEL__ */
154
155#endif /* ifndef _LINUX_WATCHDOG_H */