1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __WATCHDOG_PRETIMEOUT_H
3 #define __WATCHDOG_PRETIMEOUT_H
4 
5 #define WATCHDOG_GOV_NAME_MAXLEN	20
6 
7 struct watchdog_device;
8 
9 struct watchdog_governor {
10 	const char	name[WATCHDOG_GOV_NAME_MAXLEN];
11 	void		(*pretimeout)(struct watchdog_device *wdd);
12 };
13 
14 #if IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_GOV)
15 /* Interfaces to watchdog pretimeout governors */
16 int watchdog_register_governor(struct watchdog_governor *gov);
17 void watchdog_unregister_governor(struct watchdog_governor *gov);
18 
19 /* Interfaces to watchdog_dev.c */
20 int watchdog_register_pretimeout(struct watchdog_device *wdd);
21 void watchdog_unregister_pretimeout(struct watchdog_device *wdd);
22 int watchdog_pretimeout_available_governors_get(char *buf);
23 int watchdog_pretimeout_governor_get(struct watchdog_device *wdd, char *buf);
24 int watchdog_pretimeout_governor_set(struct watchdog_device *wdd,
25 				     const char *buf);
26 
27 #if IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_DEFAULT_GOV_NOOP)
28 #define WATCHDOG_PRETIMEOUT_DEFAULT_GOV		"noop"
29 #elif IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_DEFAULT_GOV_PANIC)
30 #define WATCHDOG_PRETIMEOUT_DEFAULT_GOV		"panic"
31 #endif
32 
33 #else
34 static inline int watchdog_register_pretimeout(struct watchdog_device *wdd)
35 {
36 	return 0;
37 }
38 
39 static inline void watchdog_unregister_pretimeout(struct watchdog_device *wdd)
40 {
41 }
42 
43 static inline int watchdog_pretimeout_available_governors_get(char *buf)
44 {
45 	return -EINVAL;
46 }
47 
48 static inline int watchdog_pretimeout_governor_get(struct watchdog_device *wdd,
49 						   char *buf)
50 {
51 	return -EINVAL;
52 }
53 
54 static inline int watchdog_pretimeout_governor_set(struct watchdog_device *wdd,
55 						   const char *buf)
56 {
57 	return -EINVAL;
58 }
59 #endif
60 
61 #endif
62