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Commit 83516651 authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge
Browse files

power_supply: allow a power supply to explicitly point to powered device 



If a power supply has a scope of "Device", then allow the power supply
to indicate what device it actually powers. This is represented in the
power supply's sysfs directory as a symlink named "powers", which points to
the sysfs directory of the powered device.

If the device has children, then the sub-devices are also powered by
the same power supply.

Signed-off-by: default avatarJeremy Fitzhardinge <jeremy@goop.org>
Cc: Richard Hughes <richard@hughsie.com>
parent 25a0bc2d

drivers/power/power_supply_core.c

+7 −0
Original line number Original line Diff line number Diff line
@@ -147,6 +147,12 @@ struct power_supply *power_supply_get_by_name(char *name) 
}

}

EXPORT_SYMBOL_GPL(power_supply_get_by_name);

EXPORT_SYMBOL_GPL(power_supply_get_by_name);





int power_supply_powers(struct power_supply *psy, struct device *dev)

{

	return sysfs_create_link_nowarn(&psy->dev->kobj, &dev->kobj, "powers");

}

EXPORT_SYMBOL_GPL(power_supply_powers);



static void power_supply_dev_release(struct device *dev)

static void power_supply_dev_release(struct device *dev)

{

{

	pr_debug("device: '%s': %s\n", dev_name(dev), __func__);

	pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
@@ -202,6 +208,7 @@ EXPORT_SYMBOL_GPL(power_supply_register); 
void power_supply_unregister(struct power_supply *psy)

void power_supply_unregister(struct power_supply *psy)

{

{

	cancel_work_sync(&psy->changed_work);

	cancel_work_sync(&psy->changed_work);

	sysfs_remove_link(&psy->dev->kobj, "powers");

	power_supply_remove_triggers(psy);

	power_supply_remove_triggers(psy);

	device_unregister(psy->dev);

	device_unregister(psy->dev);

}

}

include/linux/power_supply.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -218,6 +218,7 @@ static inline int power_supply_is_system_supplied(void) { return -ENOSYS; } 
extern int power_supply_register(struct device *parent,

extern int power_supply_register(struct device *parent,

				 struct power_supply *psy);

				 struct power_supply *psy);

extern void power_supply_unregister(struct power_supply *psy);

extern void power_supply_unregister(struct power_supply *psy);

extern int power_supply_powers(struct power_supply *psy, struct device *dev);





/* For APM emulation, think legacy userspace. */

/* For APM emulation, think legacy userspace. */

extern struct class *power_supply_class;

extern struct class *power_supply_class;