[PATCH v2 3/4] power: supply: core: fix charge_behaviour formatting

[Thomas Weißschuh]

This property is documented to have a special format which exposes all
available behaviours and the currently active one at the same time.
For this special format some helpers are provided.

However the default property logic in power_supply_sysfs.c is not using
the helper and the default logic only prints the currently active
behaviour.

Adjust power_supply_sysfs.c to follow the documented format.

There are currently two in-tree drivers exposing charge behaviours:
thinkpad_acpi and mm8013.
thinkpad_acpi is not affected by the change, as it directly uses the
helpers and does not use the power_supply_sysfs.c logic.

As mm8013 does not set implement desc->charge_behaviours.
the new logic will preserve the simple output format in this case.

Fixes: 1b0b6cc8030d ("power: supply: add charge_behaviour attributes")
Signed-off-by: Thomas Weißschuh <linux@xxxxxxxxxxxxxx>
---
 drivers/power/supply/power_supply_sysfs.c | 20 ++++++++++++++++++++
 include/linux/power_supply.h              |  1 +
 2 files changed, 21 insertions(+)

diff --git a/drivers/power/supply/power_supply_sysfs.c b/drivers/power/supply/power_supply_sysfs.c
index 10fec411794b..a20aa0156b0a 100644
--- a/drivers/power/supply/power_supply_sysfs.c
+++ b/drivers/power/supply/power_supply_sysfs.c
@@ -271,6 +271,23 @@ static ssize_t power_supply_show_usb_type(struct device *dev,
 	return count;
 }
 
+static ssize_t power_supply_show_charge_behaviour(struct device *dev,
+						  struct power_supply *psy,
+						  union power_supply_propval *value,
+						  char *buf)
+{
+	int ret;
+
+	ret = power_supply_get_property(psy,
+					POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR,
+					value);
+	if (ret < 0)
+		return ret;
+
+	return power_supply_charge_behaviour_show(dev, psy->desc->charge_behaviours,
+						  value->intval, buf);
+}
+
 static ssize_t power_supply_show_property(struct device *dev,
 					  struct device_attribute *attr,
 					  char *buf) {
@@ -303,6 +320,9 @@ static ssize_t power_supply_show_property(struct device *dev,
 		ret = power_supply_show_usb_type(dev, psy->desc,
 						&value, buf);
 		break;
+	case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
+		ret = power_supply_show_charge_behaviour(dev, psy, &value, buf);
+		break;
 	case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER:
 		ret = sysfs_emit(buf, "%s\n", value.strval);
 		break;
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index c0992a77feea..a50ee69503bf 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -242,6 +242,7 @@ struct power_supply_config {
 struct power_supply_desc {
 	const char *name;
 	enum power_supply_type type;
+	u8 charge_behaviours;
 	const enum power_supply_usb_type *usb_types;
 	size_t num_usb_types;
 	const enum power_supply_property *properties;

-- 
2.44.0