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power: supply: Add power_supply_set_input_current_limit_from_supplier helper

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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 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@redhat.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
This commit is contained in:
Hans de Goede 2017-08-15 22:04:56 +02:00 committed by Sebastian Reichel
parent 4f1e0cb788
commit c3142dd8be
2 changed files with 43 additions and 0 deletions
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41
drivers/power/supply/power_supply_core.c
View File

@ -371,6 +371,47 @@ 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 &&

2
include/linux/power_supply.h
View File

@ -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