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

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Date:   Sun, 26 May 2019 23:22:58 -0300
From:   Matheus Castello <matheus@...tello.eng.br>
To:     sre@...nel.org, krzk@...nel.org, robh+dt@...nel.org
Cc:     mark.rutland@....com, cw00.choi@...sung.com,
        b.zolnierkie@...sung.com, lee.jones@...aro.org,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Matheus Castello <matheus@...tello.eng.br>
Subject: [PATCH v3 5/5] 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@...tello.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