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Commit c3142dd8 authored by Hans de Goede's avatar Hans de Goede Committed by Sebastian Reichel
Browse files

power: supply: Add power_supply_set_input_current_limit_from_supplier helper 



On some devices the USB Type-C port power (USB PD 2.0) negotiation is
done by a separate port-controller IC, while the current limit is
controlled through another (charger) IC.

It has been decided to model this by modelling the external Type-C
power brick (adapter/charger) as a power-supply class device which
supplies the charger-IC, with its voltage-now and current-max representing
the negotiated voltage and max current draw.

This commit adds a power_supply_set_input_current_limit_from_supplier
helper function which charger power-supply drivers can call to get
the max-current from their supplier and have this applied
through their set_property call-back to their input-current-limit.

Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.co.uk>
parent 4f1e0cb7

drivers/power/supply/power_supply_core.c

+41 −0
Original line number Diff line number Diff line
@@ -371,6 +371,47 @@ int power_supply_is_system_supplied(void) 
}

EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);



static int __power_supply_get_supplier_max_current(struct device *dev,

						   void *data)

{

	union power_supply_propval ret = {0,};

	struct power_supply *epsy = dev_get_drvdata(dev);

	struct power_supply *psy = data;



	if (__power_supply_is_supplied_by(epsy, psy))

		if (!epsy->desc->get_property(epsy,

					      POWER_SUPPLY_PROP_CURRENT_MAX,

					      &ret))

			return ret.intval;



	return 0;

}



int power_supply_set_input_current_limit_from_supplier(struct power_supply *psy)

{

	union power_supply_propval val = {0,};

	int curr;



	if (!psy->desc->set_property)

		return -EINVAL;



	/*

	 * This function is not intended for use with a supply with multiple

	 * suppliers, we simply pick the first supply to report a non 0

	 * max-current.

	 */

	curr = class_for_each_device(power_supply_class, NULL, psy,

				      __power_supply_get_supplier_max_current);

	if (curr <= 0)

		return (curr == 0) ? -ENODEV : curr;



	val.intval = curr;



	return psy->desc->set_property(psy,

				POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, &val);

}

EXPORT_SYMBOL_GPL(power_supply_set_input_current_limit_from_supplier);



int power_supply_set_battery_charged(struct power_supply *psy)

{

	if (atomic_read(&psy->use_cnt) >= 0 &&

include/linux/power_supply.h

+2 −0
Original line number Diff line number Diff line
@@ -332,6 +332,8 @@ extern int power_supply_get_battery_info(struct power_supply *psy, 
					 struct power_supply_battery_info *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_set_input_current_limit_from_supplier(

					 struct power_supply *psy);

extern int power_supply_set_battery_charged(struct power_supply *psy);



#ifdef CONFIG_POWER_SUPPLY