Messages in this thread Patch in this message | | | Date | Tue, 26 Aug 2008 21:09:59 +0100 | From | Matthew Garrett <> | Subject | [PATCH] power-supply: Add function to return system-wide power state |
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(resend, I screwed up the Cc)
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>
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The name is a bit odd, but seems to fit in with the existing naming scheme.
diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c index cb1ccb4..6a687da 100644 --- a/drivers/power/power_supply_core.c +++ b/drivers/power/power_supply_core.c @@ -87,6 +87,31 @@ 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() +{ + 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 +173,7 @@ 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); diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h index ea96ead..3e67d0c 100644 --- a/include/linux/power_supply.h +++ b/include/linux/power_supply.h @@ -164,6 +164,7 @@ struct power_supply_info { extern void power_supply_changed(struct power_supply *psy); extern int power_supply_am_i_supplied(struct power_supply *psy); +extern int power_supply_is_system_supplied(void); extern int power_supply_register(struct device *parent, struct power_supply *psy); -- Matthew Garrett | mjg59@srcf.ucam.org
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