[PATCH v3 5/5] power: supply: max17040: Send uevent in SOC and status change

[Matheus Castello]

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 <math...@castello.eng.br>
---
 drivers/power/supply/max17040_battery.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/power/supply/max17040_battery.c 
b/drivers/power/supply/max17040_battery.c
index 61e6fcfea8a1..34278845cfe5 100644
--- a/drivers/power/supply/max17040_battery.c
+++ b/drivers/power/supply/max17040_battery.c
@@ -176,6 +176,9 @@ static void max17040_get_online(struct i2c_client *client)
 static void max17040_get_status(struct i2c_client *client)
 {
        struct max17040_chip *chip = i2c_get_clientdata(client);
+       int last_status;
+
+       last_status = chip->status;

        if (!chip->pdata || !chip->pdata->charger_online
                        || !chip->pdata->charger_enable) {
@@ -194,6 +197,9 @@ static void max17040_get_status(struct i2c_client *client)

        if (chip->soc > MAX17040_BATTERY_FULL)
                chip->status = POWER_SUPPLY_STATUS_FULL;
+
+       if (last_status != chip->status)
+               power_supply_changed(chip->battery);
 }

 static void max17040_get_of_data(struct max17040_chip *chip)
@@ -217,10 +223,18 @@ static void max17040_check_changes(struct i2c_client 
*client)
 static void max17040_work(struct work_struct *work)
 {
        struct max17040_chip *chip;
+       int last_soc;

        chip = container_of(work, struct max17040_chip, work.work);
+
+       /* store SOC for check change */
+       last_soc = chip->soc;
        max17040_check_changes(chip->client);

+       /* check changes and send uevent */
+       if (chip->soc >= 0 && last_soc != chip->soc)
+               power_supply_changed(chip->battery);
+
        queue_delayed_work(system_power_efficient_wq, &chip->work,
                           MAX17040_DELAY);
 }
--
2.20.1