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| author | Matthew Garrett <mjg59@srcf.ucam.org> | 2008-08-26 21:09:59 +0100 |
|---|---|---|
| committer | Anton Vorontsov <cbouatmailru@gmail.com> | 2008-09-01 02:42:54 +0400 |
| commit | 942ed161944b3476639916cf544e6975b29c985a (patch) | |
| tree | a05e3bd0d6b59de318f3bfc5557502c13dde1bc4 /include/linux/power_supply.h | |
| parent | e82374fd1a804e197fc2a54c3930e70c5d300abc (diff) | |
| download | linux-942ed161944b3476639916cf544e6975b29c985a.tar.gz linux-942ed161944b3476639916cf544e6975b29c985a.tar.xz | |
power_supply: Add function to return system-wide power state
Certain drivers benefit from knowing whether the system is on ac or
battery, for instance when determining which backlight registers to
read. This adds a simple call to determine whether there's an online
power supply other than any batteries.
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
Diffstat (limited to 'include/linux/power_supply.h')
| -rw-r--r-- | include/linux/power_supply.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h index ea96ead1d39d..f9348cba6dc1 100644 --- a/include/linux/power_supply.h +++ b/include/linux/power_supply.h @@ -165,6 +165,12 @@ struct power_supply_info { extern void power_supply_changed(struct power_supply *psy); extern int power_supply_am_i_supplied(struct power_supply *psy); +#if defined(CONFIG_POWER_SUPPLY) || defined(CONFIG_POWER_SUPPLY_MODULE) +extern int power_supply_is_system_supplied(void); +#else +static inline int power_supply_is_system_supplied(void) { return -ENOSYS; } +#endif + extern int power_supply_register(struct device *parent, struct power_supply *psy); extern void power_supply_unregister(struct power_supply *psy); |