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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 | */ | |
1da177e4 LT |
8 | #ifndef _LINUX_WATCHDOG_H |
9 | #define _LINUX_WATCHDOG_H | |
10 | ||
4bfdf378 | 11 | |
ff0b3cd4 | 12 | #include <linux/bitops.h> |
45f5fed3 AC |
13 | #include <linux/device.h> |
14 | #include <linux/cdev.h> | |
2165bf52 | 15 | #include <linux/notifier.h> |
607ca46e | 16 | #include <uapi/linux/watchdog.h> |
4bfdf378 | 17 | |
43316044 WVS |
18 | struct watchdog_ops; |
19 | struct watchdog_device; | |
b4ffb190 | 20 | struct watchdog_core_data; |
43316044 WVS |
21 | |
22 | /** struct watchdog_ops - The watchdog-devices operations | |
23 | * | |
24 | * @owner: The module owner. | |
25 | * @start: The routine for starting the watchdog device. | |
26 | * @stop: The routine for stopping the watchdog device. | |
27 | * @ping: The routine that sends a keepalive ping to the watchdog device. | |
2fa03560 | 28 | * @status: The routine that shows the status of the watchdog device. |
760d2800 WS |
29 | * @set_timeout:The routine for setting the watchdog devices timeout value (in seconds). |
30 | * @get_timeleft:The routine that gets the time left before a reset (in seconds). | |
2165bf52 | 31 | * @restart: The routine for restarting the machine. |
78d88fc0 | 32 | * @ioctl: The routines that handles extra ioctl calls. |
43316044 WVS |
33 | * |
34 | * The watchdog_ops structure contains a list of low-level operations | |
35 | * that control a watchdog device. It also contains the module that owns | |
36 | * these operations. The start and stop function are mandatory, all other | |
80220fa7 | 37 | * functions are optional. |
43316044 WVS |
38 | */ |
39 | struct watchdog_ops { | |
40 | struct module *owner; | |
41 | /* mandatory operations */ | |
42 | int (*start)(struct watchdog_device *); | |
43 | int (*stop)(struct watchdog_device *); | |
44 | /* optional operations */ | |
45 | int (*ping)(struct watchdog_device *); | |
2fa03560 | 46 | unsigned int (*status)(struct watchdog_device *); |
014d694e | 47 | int (*set_timeout)(struct watchdog_device *, unsigned int); |
fd7b673c | 48 | unsigned int (*get_timeleft)(struct watchdog_device *); |
2165bf52 | 49 | int (*restart)(struct watchdog_device *); |
78d88fc0 | 50 | long (*ioctl)(struct watchdog_device *, unsigned int, unsigned long); |
43316044 WVS |
51 | }; |
52 | ||
53 | /** struct watchdog_device - The structure that defines a watchdog device | |
54 | * | |
45f5fed3 | 55 | * @id: The watchdog's ID. (Allocated by watchdog_register_device) |
d6b469d9 AC |
56 | * @dev: The device for our watchdog |
57 | * @parent: The parent bus device | |
43316044 WVS |
58 | * @info: Pointer to a watchdog_info structure. |
59 | * @ops: Pointer to the list of watchdog operations. | |
2fa03560 | 60 | * @bootstatus: Status of the watchdog device at boot. |
760d2800 WS |
61 | * @timeout: The watchdog devices timeout value (in seconds). |
62 | * @min_timeout:The watchdog devices minimum timeout value (in seconds). | |
63 | * @max_timeout:The watchdog devices maximum timeout value (in seconds). | |
e1313196 | 64 | * @reboot_nb: The notifier block to stop watchdog on reboot. |
2165bf52 | 65 | * @restart_nb: The notifier block to register a restart function. |
b4ffb190 GR |
66 | * @driver_data:Pointer to the drivers private data. |
67 | * @wd_data: Pointer to watchdog core internal data. | |
43316044 | 68 | * @status: Field that contains the devices internal status bits. |
ef90174f JBT |
69 | * @deferred: entry in wtd_deferred_reg_list which is used to |
70 | * register early initialized watchdogs. | |
43316044 WVS |
71 | * |
72 | * The watchdog_device structure contains all information about a | |
73 | * watchdog timer device. | |
74 | * | |
75 | * The driver-data field may not be accessed directly. It must be accessed | |
76 | * via the watchdog_set_drvdata and watchdog_get_drvdata helpers. | |
f4e9c82f HG |
77 | * |
78 | * The lock field is for watchdog core internal use only and should not be | |
79 | * touched. | |
43316044 WVS |
80 | */ |
81 | struct watchdog_device { | |
45f5fed3 | 82 | int id; |
d6b469d9 AC |
83 | struct device *dev; |
84 | struct device *parent; | |
43316044 WVS |
85 | const struct watchdog_info *info; |
86 | const struct watchdog_ops *ops; | |
2fa03560 | 87 | unsigned int bootstatus; |
014d694e | 88 | unsigned int timeout; |
3f43f68e WVS |
89 | unsigned int min_timeout; |
90 | unsigned int max_timeout; | |
e1313196 | 91 | struct notifier_block reboot_nb; |
2165bf52 | 92 | struct notifier_block restart_nb; |
43316044 | 93 | void *driver_data; |
b4ffb190 | 94 | struct watchdog_core_data *wd_data; |
43316044 WVS |
95 | unsigned long status; |
96 | /* Bit numbers for status flags */ | |
234445b4 | 97 | #define WDOG_ACTIVE 0 /* Is the watchdog running/active */ |
b4ffb190 GR |
98 | #define WDOG_NO_WAY_OUT 1 /* Is 'nowayout' feature set ? */ |
99 | #define WDOG_STOP_ON_REBOOT 2 /* Should be stopped on reboot */ | |
ef90174f | 100 | struct list_head deferred; |
43316044 WVS |
101 | }; |
102 | ||
4846e378 UKK |
103 | #define WATCHDOG_NOWAYOUT IS_BUILTIN(CONFIG_WATCHDOG_NOWAYOUT) |
104 | #define WATCHDOG_NOWAYOUT_INIT_STATUS (WATCHDOG_NOWAYOUT << WDOG_NO_WAY_OUT) | |
ff0b3cd4 | 105 | |
48fc7f7e | 106 | /* Use the following function to check whether or not the watchdog is active */ |
257f8c4a VK |
107 | static inline bool watchdog_active(struct watchdog_device *wdd) |
108 | { | |
109 | return test_bit(WDOG_ACTIVE, &wdd->status); | |
110 | } | |
111 | ||
ff0b3cd4 | 112 | /* Use the following function to set the nowayout feature */ |
86a1e189 | 113 | static inline void watchdog_set_nowayout(struct watchdog_device *wdd, bool nowayout) |
ff0b3cd4 WVS |
114 | { |
115 | if (nowayout) | |
116 | set_bit(WDOG_NO_WAY_OUT, &wdd->status); | |
117 | } | |
118 | ||
e1313196 DR |
119 | /* Use the following function to stop the watchdog on reboot */ |
120 | static inline void watchdog_stop_on_reboot(struct watchdog_device *wdd) | |
121 | { | |
122 | set_bit(WDOG_STOP_ON_REBOOT, &wdd->status); | |
123 | } | |
124 | ||
3048253e FP |
125 | /* Use the following function to check if a timeout value is invalid */ |
126 | static inline bool watchdog_timeout_invalid(struct watchdog_device *wdd, unsigned int t) | |
127 | { | |
1e935949 GR |
128 | /* |
129 | * The timeout is invalid if | |
130 | * - the requested value is smaller than the configured minimum timeout, | |
131 | * or | |
132 | * - a maximum timeout is configured, and the requested value is larger | |
133 | * than the maximum timeout. | |
134 | */ | |
135 | return t < wdd->min_timeout || | |
136 | (wdd->max_timeout && t > wdd->max_timeout); | |
3048253e FP |
137 | } |
138 | ||
43316044 WVS |
139 | /* Use the following functions to manipulate watchdog driver specific data */ |
140 | static inline void watchdog_set_drvdata(struct watchdog_device *wdd, void *data) | |
141 | { | |
142 | wdd->driver_data = data; | |
143 | } | |
144 | ||
145 | static inline void *watchdog_get_drvdata(struct watchdog_device *wdd) | |
146 | { | |
147 | return wdd->driver_data; | |
148 | } | |
149 | ||
cf13a84d | 150 | /* drivers/watchdog/watchdog_core.c */ |
2165bf52 | 151 | void watchdog_set_restart_priority(struct watchdog_device *wdd, int priority); |
3048253e FP |
152 | extern int watchdog_init_timeout(struct watchdog_device *wdd, |
153 | unsigned int timeout_parm, struct device *dev); | |
43316044 WVS |
154 | extern int watchdog_register_device(struct watchdog_device *); |
155 | extern void watchdog_unregister_device(struct watchdog_device *); | |
156 | ||
1da177e4 | 157 | #endif /* ifndef _LINUX_WATCHDOG_H */ |