power: supply: bq24190_charger: Get input_current_limit from our supplier

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 adding
an external_power_changed callback and calling
power_supply_set_input_current_limit_from_supplier from this callback.
This callback will only get called if the bq24190 has a parent-supply.

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@redhat.com>
Tony Lindgren <tony@atomide.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>

diff --git a/drivers/power/supply/bq24190_charger.c b/drivers/power/supply/bq24190_charger.c
index e606a078b0dde8602c1b742fdd2a6def8808645c..35ff406aca483e93974aed9ae0514855269fa3eb 100644 (file)
--- a/drivers/power/supply/bq24190_charger.c
+++ b/drivers/power/supply/bq24190_charger.c
@@ -165,6 +165,7 @@ struct bq24190_dev_info {
        struct extcon_dev               *extcon;
        struct notifier_block           extcon_nb;
        struct delayed_work             extcon_work;
+       struct delayed_work             input_current_limit_work;
        char                            model_name[I2C_NAME_SIZE];
        bool                            initialized;
        bool                            irq_event;
@@ -1210,6 +1211,32 @@ static int bq24190_charger_property_is_writeable(struct power_supply *psy,
        return ret;
 }
 
+static void bq24190_input_current_limit_work(struct work_struct *work)
+{
+       struct bq24190_dev_info *bdi =
+               container_of(work, struct bq24190_dev_info,
+                            input_current_limit_work.work);
+
+       power_supply_set_input_current_limit_from_supplier(bdi->charger);
+}
+
+/* Sync the input-current-limit with our parent supply (if we have one) */
+static void bq24190_charger_external_power_changed(struct power_supply *psy)
+{
+       struct bq24190_dev_info *bdi = power_supply_get_drvdata(psy);
+
+       /*
+        * The Power-Good detection may take up to 220ms, sometimes
+        * the external charger detection is quicker, and the bq24190 will
+        * reset to iinlim based on its own charger detection (which is not
+        * hooked up when using external charger detection) resulting in a
+        * too low default 500mA iinlim. Delay setting the input-current-limit
+        * for 300ms to avoid this.
+        */
+       queue_delayed_work(system_wq, &bdi->input_current_limit_work,
+                          msecs_to_jiffies(300));
+}
+
 static enum power_supply_property bq24190_charger_properties[] = {
        POWER_SUPPLY_PROP_CHARGE_TYPE,
        POWER_SUPPLY_PROP_HEALTH,
@@ -1240,6 +1267,7 @@ 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 */
@@ -1758,6 +1786,8 @@ static int bq24190_probe(struct i2c_client *client,
        mutex_init(&bdi->f_reg_lock);
        bdi->f_reg = 0;
        bdi->ss_reg = BQ24190_REG_SS_VBUS_STAT_MASK; /* impossible state */
+       INIT_DELAYED_WORK(&bdi->input_current_limit_work,
+                         bq24190_input_current_limit_work);
 
        i2c_set_clientdata(client, bdi);