drivers/watchdog/watchdog_pretimeout.h

   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