Hallo Hans :-)
On Sun, Aug 6, 2017 at 5:35 AM, Hans de Goede <hdegoede@xxxxxxxxxx> wrote:
> 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 support for this to the bq24190_charger driver by calling
> power_supply_set_input_current_limit_from_supplier helper if the
> "input-current-limit-from-supplier" device-property is set.
>
> Note this replaces the functionality to get the current-limit from an
> extcon device, which will be removed in a follow-up commit.
>
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> ---
> drivers/power/supply/bq24190_charger.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/drivers/power/supply/bq24190_charger.c b/drivers/power/supply/bq24190_charger.c
> index d78e2c6dc127..1f6424f0772f 100644
> --- a/drivers/power/supply/bq24190_charger.c
> +++ b/drivers/power/supply/bq24190_charger.c
> @@ -161,6 +161,7 @@ struct bq24190_dev_info {
> char model_name[I2C_NAME_SIZE];
> bool initialized;
> bool irq_event;
> + bool input_current_limit_from_supplier;
> struct mutex f_reg_lock;
> u8 f_reg;
> u8 ss_reg;
> @@ -1137,6 +1138,14 @@ static int bq24190_charger_property_is_writeable(struct power_supply *psy,
> return ret;
> }
>
> +static void bq24190_charger_external_power_changed(struct power_supply *psy)
> +{
> + struct bq24190_dev_info *bdi = power_supply_get_drvdata(psy);
> +
> + if (bdi->input_current_limit_from_supplier)
> + power_supply_set_input_current_limit_from_supplier(psy);
> +}
> +
> static enum power_supply_property bq24190_charger_properties[] = {
> POWER_SUPPLY_PROP_CHARGE_TYPE,
> POWER_SUPPLY_PROP_HEALTH,
> @@ -1165,6 +1174,7 @@ static const struct power_supply_desc bq24190_charger_desc = {
> .get_property = bq24190_charger_get_property,
> .set_property = bq24190_charger_set_property,
> .property_is_writeable = bq24190_charger_property_is_writeable,
> + .external_power_changed = bq24190_charger_external_power_changed,
> };
>
> /* Battery power supply property routines */
> @@ -1654,6 +1664,10 @@ static int bq24190_probe(struct i2c_client *client,
> return -EINVAL;
> }
>
> + bdi->input_current_limit_from_supplier =
> + device_property_read_bool(dev,
> + "input-current-limit-from-supplier");
Since this invokes the new power_supply_class function, should this be
a devicetree property, not just a driver-to-driver switch? If so, the
property name should probably be defined in
Doc...bindings/power/supply/power_supply.txt.
My latest bq24190 series has a new DT doc, which should ref a new DT property.
