Commit 539b9c94 authored by Thomas Weißschuh's avatar Thomas Weißschuh Committed by Hans de Goede
Browse files

power: supply: add helpers for charge_behaviour sysfs 



These helper functions can be used by drivers to implement their own
sysfs-attributes.
This is useful for ACPI-drivers extending the default ACPI-battery with
their own charge_behaviour attributes.

Signed-off-by: default avatarThomas Weißschuh <linux@weissschuh.net>
Acked-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20211123232704.25394-3-linux@weissschuh.net


Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
parent 1b0b6cc8

drivers/power/supply/power_supply_sysfs.c

+55 −0
Original line number Diff line number Diff line
@@ -133,6 +133,12 @@ static const char * const POWER_SUPPLY_SCOPE_TEXT[] = { 
	[POWER_SUPPLY_SCOPE_DEVICE]	= "Device",

};



static const char * const POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[] = {

	[POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO]		= "auto",

	[POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE]	= "inhibit-charge",

	[POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE]	= "force-discharge",

};



static struct power_supply_attr power_supply_attrs[] = {

	/* Properties of type `int' */

	POWER_SUPPLY_ENUM_ATTR(STATUS),
@@ -484,3 +490,52 @@ int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env) 


	return ret;

}



ssize_t power_supply_charge_behaviour_show(struct device *dev,

					   unsigned int available_behaviours,

					   enum power_supply_charge_behaviour current_behaviour,

					   char *buf)

{

	bool match = false, available, active;

	ssize_t count = 0;

	int i;



	for (i = 0; i < ARRAY_SIZE(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT); i++) {

		available = available_behaviours & BIT(i);

		active = i == current_behaviour;



		if (available && active) {

			count += sysfs_emit_at(buf, count, "[%s] ",

					       POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]);

			match = true;

		} else if (available) {

			count += sysfs_emit_at(buf, count, "%s ",

					       POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]);

		}

	}



	if (!match) {

		dev_warn(dev, "driver reporting unsupported charge behaviour\n");

		return -EINVAL;

	}



	if (count)

		buf[count - 1] = '\n';



	return count;

}

EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_show);



int power_supply_charge_behaviour_parse(unsigned int available_behaviours, const char *buf)

{

	int i = sysfs_match_string(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT, buf);



	if (i < 0)

		return i;



	if (available_behaviours & BIT(i))

		return i;



	return -EINVAL;

}

EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_parse);

include/linux/power_supply.h

+9 −0
Original line number Diff line number Diff line
@@ -546,4 +546,13 @@ static inline 
void power_supply_remove_hwmon_sysfs(struct power_supply *psy) {}

#endif



#ifdef CONFIG_SYSFS

ssize_t power_supply_charge_behaviour_show(struct device *dev,

					   unsigned int available_behaviours,

					   enum power_supply_charge_behaviour behaviour,

					   char *buf);



int power_supply_charge_behaviour_parse(unsigned int available_behaviours, const char *buf);

#endif



#endif /* __LINUX_POWER_SUPPLY_H__ */