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power_supply: Add function to return system-wide power state

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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 <[email protected]>
Signed-off-by: Anton Vorontsov <[email protected]>
This commit is contained in:
Matthew Garrett 2008-08-26 21:09:59 +01:00 • committed by Anton Vorontsov
commit 942ed16194
2 changed files with 31 additions and 0 deletions
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25
drivers/power/power_supply_core.c
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@ -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);