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power: supply: bq24190_charger: Get input_current_limit from our supplier

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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>
This commit is contained in:
Hans de Goede 2017-08-30 11:48:12 +02:00 committed by Sebastian Reichel
parent 66b6bef2c4
commit 18f8e6f695
1 changed files with 30 additions and 0 deletions
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30
drivers/power/supply/bq24190_charger.c
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@ -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);