Commit 8be558dc authored by Frank Wang's avatar Frank Wang Committed by Greg Kroah-Hartman
Browse files

usb: typec: tcpm: add get max power support 



Traverse fixed pdos to calculate the maximum power that the charger
can provide, and it can be get by POWER_SUPPLY_PROP_INPUT_POWER_LIMIT
property.

Signed-off-by: default avatarFrank Wang <frank.wang@rock-chips.com>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20230616075241.27690-2-frank.wang@rock-chips.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 1e35f074

drivers/usb/typec/tcpm/tcpm.c

+24 −0
Original line number Diff line number Diff line
@@ -6340,6 +6340,27 @@ static int tcpm_psy_get_current_now(struct tcpm_port *port, 
	return 0;

}



static int tcpm_psy_get_input_power_limit(struct tcpm_port *port,

					  union power_supply_propval *val)

{

	unsigned int src_mv, src_ma, max_src_uw = 0;

	unsigned int i, tmp;



	for (i = 0; i < port->nr_source_caps; i++) {

		u32 pdo = port->source_caps[i];



		if (pdo_type(pdo) == PDO_TYPE_FIXED) {

			src_mv = pdo_fixed_voltage(pdo);

			src_ma = pdo_max_current(pdo);

			tmp = src_mv * src_ma;

			max_src_uw = tmp > max_src_uw ? tmp : max_src_uw;

		}

	}



	val->intval = max_src_uw;

	return 0;

}



static int tcpm_psy_get_prop(struct power_supply *psy,

			     enum power_supply_property psp,

			     union power_supply_propval *val)
@@ -6369,6 +6390,9 @@ static int tcpm_psy_get_prop(struct power_supply *psy, 
	case POWER_SUPPLY_PROP_CURRENT_NOW:

		ret = tcpm_psy_get_current_now(port, val);

		break;

	case POWER_SUPPLY_PROP_INPUT_POWER_LIMIT:

		tcpm_psy_get_input_power_limit(port, val);

		break;

	default:

		ret = -EINVAL;

		break;