diff options
| 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 /drivers/power | |
| parent | e82374fd1a804e197fc2a54c3930e70c5d300abc (diff) | |
| download | linux-942ed161944b3476639916cf544e6975b29c985a.tar.gz | |
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 'drivers/power')
| -rw-r--r-- | drivers/power/power_supply_core.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c index cb1ccb472921..f44f5b608f6a 100644 --- a/drivers/power/power_supply_core.c +++ b/drivers/power/power_supply_core.c @@ -87,6 +87,30 @@ int power_supply_am_i_supplied(struct power_supply *psy) return error; } +static int __power_supply_is_system_supplied(struct device *dev, void *data) +{ + union power_supply_propval ret = {0,}; + struct power_supply *psy = dev_get_drvdata(dev); + + if (psy->type != POWER_SUPPLY_TYPE_BATTERY) { + if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret)) + return 0; + if (ret.intval) + return ret.intval; + } + return 0; +} + +int power_supply_is_system_supplied(void) +{ + int error; + + error = class_for_each_device(power_supply_class, NULL, NULL, + __power_supply_is_system_supplied); + + return error; +} + int power_supply_register(struct device *parent, struct power_supply *psy) { int rc = 0; @@ -148,6 +172,7 @@ static void __exit power_supply_class_exit(void) EXPORT_SYMBOL_GPL(power_supply_changed); EXPORT_SYMBOL_GPL(power_supply_am_i_supplied); +EXPORT_SYMBOL_GPL(power_supply_is_system_supplied); EXPORT_SYMBOL_GPL(power_supply_register); EXPORT_SYMBOL_GPL(power_supply_unregister); |