[PATCH 4/4] power: supply: max17040: Send uevent in SOC changes

[Matheus Castello]

Add check for changes in state of charge from delayed work, so
in case of changes we call power_supply_changed to send an uevent.

power_supply_changed send an uevent for alert user space about
changes, is useful for example to user space apps made changes in
UI battery level or made other decisions.

Signed-off-by: Matheus Castello <math...@castello.eng.br>
---
 drivers/power/supply/max17040_battery.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/power/supply/max17040_battery.c 
b/drivers/power/supply/max17040_battery.c
index 3efa52d32b44..72915ac9e13b 100644
--- a/drivers/power/supply/max17040_battery.c
+++ b/drivers/power/supply/max17040_battery.c
@@ -202,14 +202,22 @@ static void max17040_get_of_data(struct max17040_chip 
*chip)
 static void max17040_work(struct work_struct *work)
 {
        struct max17040_chip *chip;
+       u16 last_soc;
 
        chip = container_of(work, struct max17040_chip, work.work);
 
+       /* store SOC for check change */
+       last_soc = chip->soc;
+
        max17040_get_vcell(chip->client);
        max17040_get_soc(chip->client);
        max17040_get_online(chip->client);
        max17040_get_status(chip->client);
 
+       /* check changes and send uevent */
+       if (last_soc != chip->soc)
+               power_supply_changed(chip->battery);
+
        queue_delayed_work(system_power_efficient_wq, &chip->work,
                           MAX17040_DELAY);
 }
-- 
2.13.3