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 | */ | |
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 | 56 | * @parent: The parent bus device |
faa58475 GR |
57 | * @groups: List of sysfs attribute groups to create when creating the |
58 | * watchdog device. | |
43316044 WVS |
59 | * @info: Pointer to a watchdog_info structure. |
60 | * @ops: Pointer to the list of watchdog operations. | |
2fa03560 | 61 | * @bootstatus: Status of the watchdog device at boot. |
760d2800 WS |
62 | * @timeout: The watchdog devices timeout value (in seconds). |
63 | * @min_timeout:The watchdog devices minimum timeout value (in seconds). | |
64 | * @max_timeout:The watchdog devices maximum timeout value (in seconds). | |
e1313196 | 65 | * @reboot_nb: The notifier block to stop watchdog on reboot. |
2165bf52 | 66 | * @restart_nb: The notifier block to register a restart function. |
b4ffb190 GR |
67 | * @driver_data:Pointer to the drivers private data. |
68 | * @wd_data: Pointer to watchdog core internal data. | |
43316044 | 69 | * @status: Field that contains the devices internal status bits. |
ef90174f JBT |
70 | * @deferred: entry in wtd_deferred_reg_list which is used to |
71 | * register early initialized watchdogs. | |
43316044 WVS |
72 | * |
73 | * The watchdog_device structure contains all information about a | |
74 | * watchdog timer device. | |
75 | * | |
76 | * The driver-data field may not be accessed directly. It must be accessed | |
77 | * via the watchdog_set_drvdata and watchdog_get_drvdata helpers. | |
f4e9c82f HG |
78 | * |
79 | * The lock field is for watchdog core internal use only and should not be | |
80 | * touched. | |
43316044 WVS |
81 | */ |
82 | struct watchdog_device { | |
45f5fed3 | 83 | int id; |
d6b469d9 | 84 | struct device *parent; |
faa58475 | 85 | const struct attribute_group **groups; |
43316044 WVS |
86 | const struct watchdog_info *info; |
87 | const struct watchdog_ops *ops; | |
2fa03560 | 88 | unsigned int bootstatus; |
014d694e | 89 | unsigned int timeout; |
3f43f68e WVS |
90 | unsigned int min_timeout; |
91 | unsigned int max_timeout; | |
e1313196 | 92 | struct notifier_block reboot_nb; |
2165bf52 | 93 | struct notifier_block restart_nb; |
43316044 | 94 | void *driver_data; |
b4ffb190 | 95 | struct watchdog_core_data *wd_data; |
43316044 WVS |
96 | unsigned long status; |
97 | /* Bit numbers for status flags */ | |
234445b4 | 98 | #define WDOG_ACTIVE 0 /* Is the watchdog running/active */ |
b4ffb190 GR |
99 | #define WDOG_NO_WAY_OUT 1 /* Is 'nowayout' feature set ? */ |
100 | #define WDOG_STOP_ON_REBOOT 2 /* Should be stopped on reboot */ | |
ef90174f | 101 | struct list_head deferred; |
43316044 WVS |
102 | }; |
103 | ||
4846e378 UKK |
104 | #define WATCHDOG_NOWAYOUT IS_BUILTIN(CONFIG_WATCHDOG_NOWAYOUT) |
105 | #define WATCHDOG_NOWAYOUT_INIT_STATUS (WATCHDOG_NOWAYOUT << WDOG_NO_WAY_OUT) | |
ff0b3cd4 | 106 | |
48fc7f7e | 107 | /* Use the following function to check whether or not the watchdog is active */ |
257f8c4a VK |
108 | static inline bool watchdog_active(struct watchdog_device *wdd) |
109 | { | |
110 | return test_bit(WDOG_ACTIVE, &wdd->status); | |
111 | } | |
112 | ||
ff0b3cd4 | 113 | /* Use the following function to set the nowayout feature */ |
86a1e189 | 114 | static inline void watchdog_set_nowayout(struct watchdog_device *wdd, bool nowayout) |
ff0b3cd4 WVS |
115 | { |
116 | if (nowayout) | |
117 | set_bit(WDOG_NO_WAY_OUT, &wdd->status); | |
118 | } | |
119 | ||
e1313196 DR |
120 | /* Use the following function to stop the watchdog on reboot */ |
121 | static inline void watchdog_stop_on_reboot(struct watchdog_device *wdd) | |
122 | { | |
123 | set_bit(WDOG_STOP_ON_REBOOT, &wdd->status); | |
124 | } | |
125 | ||
3048253e FP |
126 | /* Use the following function to check if a timeout value is invalid */ |
127 | static inline bool watchdog_timeout_invalid(struct watchdog_device *wdd, unsigned int t) | |
128 | { | |
1e935949 GR |
129 | /* |
130 | * The timeout is invalid if | |
131 | * - the requested value is smaller than the configured minimum timeout, | |
132 | * or | |
133 | * - a maximum timeout is configured, and the requested value is larger | |
134 | * than the maximum timeout. | |
135 | */ | |
136 | return t < wdd->min_timeout || | |
137 | (wdd->max_timeout && t > wdd->max_timeout); | |
3048253e FP |
138 | } |
139 | ||
43316044 WVS |
140 | /* Use the following functions to manipulate watchdog driver specific data */ |
141 | static inline void watchdog_set_drvdata(struct watchdog_device *wdd, void *data) | |
142 | { | |
143 | wdd->driver_data = data; | |
144 | } | |
145 | ||
146 | static inline void *watchdog_get_drvdata(struct watchdog_device *wdd) | |
147 | { | |
148 | return wdd->driver_data; | |
149 | } | |
150 | ||
cf13a84d | 151 | /* drivers/watchdog/watchdog_core.c */ |
2165bf52 | 152 | void watchdog_set_restart_priority(struct watchdog_device *wdd, int priority); |
3048253e FP |
153 | extern int watchdog_init_timeout(struct watchdog_device *wdd, |
154 | unsigned int timeout_parm, struct device *dev); | |
43316044 WVS |
155 | extern int watchdog_register_device(struct watchdog_device *); |
156 | extern void watchdog_unregister_device(struct watchdog_device *); | |
157 | ||
1da177e4 | 158 | #endif /* ifndef _LINUX_WATCHDOG_H */ |