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Commit 942ed161 authored by Matthew Garrett's avatar Matthew Garrett Committed by Anton Vorontsov
Browse files

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: default avatarMatthew Garrett <mjg@redhat.com>
Signed-off-by: default avatarAnton Vorontsov <cbouatmailru@gmail.com>
parent e82374fd

drivers/power/power_supply_core.c

+25 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/power_supply.h

+6 −0
Original line number Diff line number Diff line
@@ -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);