Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 * @ioctl: The routines that handles extra ioctl calls.
70 *
71 * The watchdog_ops structure contains a list of low-level operations
72 * that control a watchdog device. It also contains the module that owns
73 * these operations. The start and stop function are mandatory, all other
74 * functions are optonal.
75 */
76struct watchdog_ops {
77 struct module *owner;
78 /* mandatory operations */
79 int (*start)(struct watchdog_device *);
80 int (*stop)(struct watchdog_device *);
81 /* optional operations */
82 int (*ping)(struct watchdog_device *);
83 unsigned int (*status)(struct watchdog_device *);
84 int (*set_timeout)(struct watchdog_device *, unsigned int);
85 long (*ioctl)(struct watchdog_device *, unsigned int, unsigned long);
86};
87
88/** struct watchdog_device - The structure that defines a watchdog device
89 *
90 * @info: Pointer to a watchdog_info structure.
91 * @ops: Pointer to the list of watchdog operations.
92 * @bootstatus: Status of the watchdog device at boot.
93 * @timeout: The watchdog devices timeout value.
94 * @min_timeout:The watchdog devices minimum timeout value.
95 * @max_timeout:The watchdog devices maximum timeout value.
96 * @driver-data:Pointer to the drivers private data.
97 * @status: Field that contains the devices internal status bits.
98 *
99 * The watchdog_device structure contains all information about a
100 * watchdog timer device.
101 *
102 * The driver-data field may not be accessed directly. It must be accessed
103 * via the watchdog_set_drvdata and watchdog_get_drvdata helpers.
104 */
105struct watchdog_device {
106 const struct watchdog_info *info;
107 const struct watchdog_ops *ops;
108 unsigned int bootstatus;
109 unsigned int timeout;
110 unsigned int min_timeout;
111 unsigned int max_timeout;
112 void *driver_data;
113 unsigned long status;
114/* Bit numbers for status flags */
115#define WDOG_ACTIVE 0 /* Is the watchdog running/active */
116#define WDOG_DEV_OPEN 1 /* Opened via /dev/watchdog ? */
117#define WDOG_ALLOW_RELEASE 2 /* Did we receive the magic char ? */
118#define WDOG_NO_WAY_OUT 3 /* Is 'nowayout' feature set ? */
119};
120
121#ifdef CONFIG_WATCHDOG_NOWAYOUT
122#define WATCHDOG_NOWAYOUT 1
123#define WATCHDOG_NOWAYOUT_INIT_STATUS (1 << WDOG_NO_WAY_OUT)
124#else
125#define WATCHDOG_NOWAYOUT 0
126#define WATCHDOG_NOWAYOUT_INIT_STATUS 0
127#endif
128
129/* Use the following function to set the nowayout feature */
130static inline void watchdog_set_nowayout(struct watchdog_device *wdd, int nowayout)
131{
132 if (nowayout)
133 set_bit(WDOG_NO_WAY_OUT, &wdd->status);
134}
135
136/* Use the following functions to manipulate watchdog driver specific data */
137static inline void watchdog_set_drvdata(struct watchdog_device *wdd, void *data)
138{
139 wdd->driver_data = data;
140}
141
142static inline void *watchdog_get_drvdata(struct watchdog_device *wdd)
143{
144 return wdd->driver_data;
145}
146
147/* drivers/watchdog/core/watchdog_core.c */
148extern int watchdog_register_device(struct watchdog_device *);
149extern void watchdog_unregister_device(struct watchdog_device *);
150
151#endif /* __KERNEL__ */
152
153#endif /* ifndef _LINUX_WATCHDOG_H */