power: supply: max17040: Send uevent in SOC and status change

Notify core through power_supply_changed() in case of changes in state
of charge and power supply status. This is useful for user-space to
efficiently update current battery level.

Signed-off-by: Matheus Castello <matheus@castello.eng.br>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

diff --git a/drivers/power/supply/max17040_battery.c b/drivers/power/supply/max17040_battery.c
index 2a2a1fd..c1188e9 100644 (file)
--- a/drivers/power/supply/max17040_battery.c
+++ b/drivers/power/supply/max17040_battery.c
@@ -207,10 +207,19 @@ static void max17040_check_changes(struct i2c_client *client)
 static void max17040_work(struct work_struct *work)
 {
        struct max17040_chip *chip;
+       int last_soc, last_status;
 
        chip = container_of(work, struct max17040_chip, work.work);
+
+       /* store SOC and status to check changes */
+       last_soc = chip->soc;
+       last_status = chip->status;
        max17040_check_changes(chip->client);
 
+       /* check changes and send uevent */
+       if (last_soc != chip->soc || last_status != chip->status)
+               power_supply_changed(chip->battery);
+
        queue_delayed_work(system_power_efficient_wq, &chip->work,
                           MAX17040_DELAY);
 }