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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: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20211123232704.25394-3-linux@weissschuh.net
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Thomas Weißschuh 2021-11-24 00:27:02 +01:00 committed by Hans de Goede
parent 1b0b6cc803
commit 539b9c94ac
2 changed files with 64 additions and 0 deletions
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55
drivers/power/supply/power_supply_sysfs.c
View File

@ -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 @@ out:
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);

9
include/linux/power_supply.h
View File

@ -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__ */