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Commit | Line | Data |
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1da177e4 LT |
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 | ||
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 */ | |
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) | |
e05b59fe CM |
31 | #define WDIOC_SETPRETIMEOUT _IOWR(WATCHDOG_IOCTL_BASE, 8, int) |
32 | #define WDIOC_GETPRETIMEOUT _IOR(WATCHDOG_IOCTL_BASE, 9, int) | |
58b519f3 | 33 | #define WDIOC_GETTIMELEFT _IOR(WATCHDOG_IOCTL_BASE, 10, int) |
1da177e4 LT |
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 */ | |
58b519f3 WVS |
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 */ | |
e05b59fe | 47 | #define WDIOF_PRETIMEOUT 0x0200 /* Pretimeout (in seconds), get/set */ |
2bbeed01 AC |
48 | #define WDIOF_ALARMONLY 0x0400 /* Watchdog triggers a management or |
49 | other external alarm not a reboot */ | |
1da177e4 LT |
50 | #define WDIOF_KEEPALIVEPING 0x8000 /* Keep alive ping reply */ |
51 | ||
52 | #define WDIOS_DISABLECARD 0x0001 /* Turn off the watchdog timer */ | |
53 | #define WDIOS_ENABLECARD 0x0002 /* Turn on the watchdog timer */ | |
54 | #define WDIOS_TEMPPANIC 0x0004 /* Kernel panic on temperature trip */ | |
55 | ||
4bfdf378 AP |
56 | #ifdef __KERNEL__ |
57 | ||
ff0b3cd4 | 58 | #include <linux/bitops.h> |
45f5fed3 AC |
59 | #include <linux/device.h> |
60 | #include <linux/cdev.h> | |
4bfdf378 | 61 | |
43316044 WVS |
62 | struct watchdog_ops; |
63 | struct watchdog_device; | |
64 | ||
65 | /** struct watchdog_ops - The watchdog-devices operations | |
66 | * | |
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. | |
2fa03560 | 71 | * @status: The routine that shows the status of the watchdog device. |
014d694e | 72 | * @set_timeout:The routine for setting the watchdog devices timeout value. |
fd7b673c | 73 | * @get_timeleft:The routine that get's the time that's left before a reset. |
78d88fc0 | 74 | * @ioctl: The routines that handles extra ioctl calls. |
43316044 WVS |
75 | * |
76 | * The watchdog_ops structure contains a list of low-level operations | |
77 | * that control a watchdog device. It also contains the module that owns | |
78 | * these operations. The start and stop function are mandatory, all other | |
79 | * functions are optonal. | |
80 | */ | |
81 | struct watchdog_ops { | |
82 | struct module *owner; | |
83 | /* mandatory operations */ | |
84 | int (*start)(struct watchdog_device *); | |
85 | int (*stop)(struct watchdog_device *); | |
86 | /* optional operations */ | |
87 | int (*ping)(struct watchdog_device *); | |
2fa03560 | 88 | unsigned int (*status)(struct watchdog_device *); |
014d694e | 89 | int (*set_timeout)(struct watchdog_device *, unsigned int); |
fd7b673c | 90 | unsigned int (*get_timeleft)(struct watchdog_device *); |
78d88fc0 | 91 | long (*ioctl)(struct watchdog_device *, unsigned int, unsigned long); |
43316044 WVS |
92 | }; |
93 | ||
94 | /** struct watchdog_device - The structure that defines a watchdog device | |
95 | * | |
45f5fed3 AC |
96 | * @id: The watchdog's ID. (Allocated by watchdog_register_device) |
97 | * @cdev: The watchdog's Character device. | |
d6b469d9 AC |
98 | * @dev: The device for our watchdog |
99 | * @parent: The parent bus device | |
43316044 WVS |
100 | * @info: Pointer to a watchdog_info structure. |
101 | * @ops: Pointer to the list of watchdog operations. | |
2fa03560 | 102 | * @bootstatus: Status of the watchdog device at boot. |
014d694e | 103 | * @timeout: The watchdog devices timeout value. |
3f43f68e WVS |
104 | * @min_timeout:The watchdog devices minimum timeout value. |
105 | * @max_timeout:The watchdog devices maximum timeout value. | |
43316044 | 106 | * @driver-data:Pointer to the drivers private data. |
f4e9c82f | 107 | * @lock: Lock for watchdog core internal use only. |
43316044 WVS |
108 | * @status: Field that contains the devices internal status bits. |
109 | * | |
110 | * The watchdog_device structure contains all information about a | |
111 | * watchdog timer device. | |
112 | * | |
113 | * The driver-data field may not be accessed directly. It must be accessed | |
114 | * via the watchdog_set_drvdata and watchdog_get_drvdata helpers. | |
f4e9c82f HG |
115 | * |
116 | * The lock field is for watchdog core internal use only and should not be | |
117 | * touched. | |
43316044 WVS |
118 | */ |
119 | struct watchdog_device { | |
45f5fed3 AC |
120 | int id; |
121 | struct cdev cdev; | |
d6b469d9 AC |
122 | struct device *dev; |
123 | struct device *parent; | |
43316044 WVS |
124 | const struct watchdog_info *info; |
125 | const struct watchdog_ops *ops; | |
2fa03560 | 126 | unsigned int bootstatus; |
014d694e | 127 | unsigned int timeout; |
3f43f68e WVS |
128 | unsigned int min_timeout; |
129 | unsigned int max_timeout; | |
43316044 | 130 | void *driver_data; |
f4e9c82f | 131 | struct mutex lock; |
43316044 WVS |
132 | unsigned long status; |
133 | /* Bit numbers for status flags */ | |
234445b4 | 134 | #define WDOG_ACTIVE 0 /* Is the watchdog running/active */ |
43316044 | 135 | #define WDOG_DEV_OPEN 1 /* Opened via /dev/watchdog ? */ |
017cf080 | 136 | #define WDOG_ALLOW_RELEASE 2 /* Did we receive the magic char ? */ |
7e192b9c | 137 | #define WDOG_NO_WAY_OUT 3 /* Is 'nowayout' feature set ? */ |
43316044 WVS |
138 | }; |
139 | ||
ff0b3cd4 WVS |
140 | #ifdef CONFIG_WATCHDOG_NOWAYOUT |
141 | #define WATCHDOG_NOWAYOUT 1 | |
142 | #define WATCHDOG_NOWAYOUT_INIT_STATUS (1 << WDOG_NO_WAY_OUT) | |
143 | #else | |
144 | #define WATCHDOG_NOWAYOUT 0 | |
145 | #define WATCHDOG_NOWAYOUT_INIT_STATUS 0 | |
146 | #endif | |
147 | ||
257f8c4a VK |
148 | /* Use the following function to check wether or not the watchdog is active */ |
149 | static inline bool watchdog_active(struct watchdog_device *wdd) | |
150 | { | |
151 | return test_bit(WDOG_ACTIVE, &wdd->status); | |
152 | } | |
153 | ||
ff0b3cd4 | 154 | /* Use the following function to set the nowayout feature */ |
86a1e189 | 155 | static inline void watchdog_set_nowayout(struct watchdog_device *wdd, bool nowayout) |
ff0b3cd4 WVS |
156 | { |
157 | if (nowayout) | |
158 | set_bit(WDOG_NO_WAY_OUT, &wdd->status); | |
159 | } | |
160 | ||
43316044 WVS |
161 | /* Use the following functions to manipulate watchdog driver specific data */ |
162 | static inline void watchdog_set_drvdata(struct watchdog_device *wdd, void *data) | |
163 | { | |
164 | wdd->driver_data = data; | |
165 | } | |
166 | ||
167 | static inline void *watchdog_get_drvdata(struct watchdog_device *wdd) | |
168 | { | |
169 | return wdd->driver_data; | |
170 | } | |
171 | ||
172 | /* drivers/watchdog/core/watchdog_core.c */ | |
173 | extern int watchdog_register_device(struct watchdog_device *); | |
174 | extern void watchdog_unregister_device(struct watchdog_device *); | |
175 | ||
4bfdf378 AP |
176 | #endif /* __KERNEL__ */ |
177 | ||
1da177e4 | 178 | #endif /* ifndef _LINUX_WATCHDOG_H */ |