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authorMatthew Garrett <mjg59@srcf.ucam.org>2008-08-27 00:09:59 +0400
committerAnton Vorontsov <cbouatmailru@gmail.com>2008-09-01 02:42:54 +0400
commit942ed161944b3476639916cf544e6975b29c985a (patch)
treea05e3bd0d6b59de318f3bfc5557502c13dde1bc4 /include/linux/power_supply.h
parente82374fd1a804e197fc2a54c3930e70c5d300abc (diff)
downloadlinux-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.h6
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);