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@xxxxxxxxxxxxxx>
---
drivers/power/supply/power_supply_sysfs.c | 55 +++++++++++++++++++++++
include/linux/power_supply.h | 9 ++++
2 files changed, 64 insertions(+)
diff --git a/drivers/power/supply/power_supply_sysfs.c b/drivers/power/supply/power_supply_sysfs.c
index c3d7cbcd4fad..5e3b8c15ddbe 100644
--- a/drivers/power/supply/power_supply_sysfs.c
+++ b/drivers/power/supply/power_supply_sysfs.c
@@ -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);
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index 70c333e86293..71f0379c2af8 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -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__ */
--
2.34.0
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