Hi,
On Tue, Aug 15, 2017 at 10:04:56PM +0200, Hans de Goede 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 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: Hans de Goede <hdegoede@xxxxxxxxxx>
Thanks, queued.
-- Sebastian
> drivers/power/supply/power_supply_core.c | 41 ++++++++++++++++++++++++++++++++
> include/linux/power_supply.h | 2 ++
> 2 files changed, 43 insertions(+)
>
> diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c
> index 0741fce..3f92574 100644
> --- a/drivers/power/supply/power_supply_core.c
> +++ b/drivers/power/supply/power_supply_core.c
> @@ -375,6 +375,47 @@ 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 &&
> diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
> index de89066..79e90b3 100644
> --- a/include/linux/power_supply.h
> +++ b/include/linux/power_supply.h
> @@ -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
> --
> 2.9.4
>
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