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

Matheus Castello
2019-05-27T02:46:18Z

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>
---
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