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author | Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> | 2016-10-07 15:39:54 +0300 |
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committer | Wim Van Sebroeck <wim@iguana.be> | 2016-10-08 10:27:10 +0200 |
commit | ff84136cb6a4943f489ad037fe93f43be0573c23 (patch) | |
tree | bde99dc52bf4066e666681d280011d37d17d269a /drivers/watchdog/watchdog_pretimeout.h | |
parent | fc113d54e9d7ef3296cdf2eff49c8ca0a3e5a482 (diff) |
watchdog: add watchdog pretimeout governor framework
The change adds a simple watchdog pretimeout framework infrastructure,
its purpose is to allow users to select a desired handling of watchdog
pretimeout events, which may be generated by some watchdog devices.
A user selects a default watchdog pretimeout governor during
compilation stage.
Watchdogs with WDIOF_PRETIMEOUT capability now have one more device
attribute in sysfs, pretimeout_governor attribute is intended to display
the selected watchdog pretimeout governor.
The framework has no impact at runtime on watchdog devices with no
WDIOF_PRETIMEOUT capability set.
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog/watchdog_pretimeout.h')
-rw-r--r-- | drivers/watchdog/watchdog_pretimeout.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/watchdog/watchdog_pretimeout.h b/drivers/watchdog/watchdog_pretimeout.h new file mode 100644 index 000000000000..c6cd9f80adb2 --- /dev/null +++ b/drivers/watchdog/watchdog_pretimeout.h @@ -0,0 +1,40 @@ +#ifndef __WATCHDOG_PRETIMEOUT_H +#define __WATCHDOG_PRETIMEOUT_H + +#define WATCHDOG_GOV_NAME_MAXLEN 20 + +struct watchdog_device; + +struct watchdog_governor { + const char name[WATCHDOG_GOV_NAME_MAXLEN]; + void (*pretimeout)(struct watchdog_device *wdd); +}; + +#if IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_GOV) +/* Interfaces to watchdog pretimeout governors */ +int watchdog_register_governor(struct watchdog_governor *gov); +void watchdog_unregister_governor(struct watchdog_governor *gov); + +/* Interfaces to watchdog_dev.c */ +int watchdog_register_pretimeout(struct watchdog_device *wdd); +void watchdog_unregister_pretimeout(struct watchdog_device *wdd); +int watchdog_pretimeout_governor_get(struct watchdog_device *wdd, char *buf); + +#else +static inline int watchdog_register_pretimeout(struct watchdog_device *wdd) +{ + return 0; +} + +static inline void watchdog_unregister_pretimeout(struct watchdog_device *wdd) +{ +} + +static inline int watchdog_pretimeout_governor_get(struct watchdog_device *wdd, + char *buf) +{ + return -EINVAL; +} +#endif + +#endif |