diff options
| author | Thomas Weißschuh <linux@weissschuh.net> | 2021-11-24 00:27:02 +0100 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2021-12-21 16:27:42 +0100 |
| commit | 539b9c94ac83563842a27e8cc3de5164b15c4de0 (patch) | |
| tree | c762821cba3c02141ea90407f0dd2f933302fe53 /drivers/power | |
| parent | 1b0b6cc8030d08d2a24e9e5f85dc36c5a58200ba (diff) | |
| download | linux-539b9c94ac83563842a27e8cc3de5164b15c4de0.tar.gz linux-539b9c94ac83563842a27e8cc3de5164b15c4de0.tar.bz2 linux-539b9c94ac83563842a27e8cc3de5164b15c4de0.zip | |
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>
Diffstat (limited to 'drivers/power')
| -rw-r--r-- | drivers/power/supply/power_supply_sysfs.c | 55 |
1 files changed, 55 insertions, 0 deletions
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 @@ 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); |