linux-kernel - [PATCH v4 4/4] power: supply: max17040: Send uevent in SOC and status change

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Message-Id: <20191031184134.30621-5-matheus@castello.eng.br>
Date:   Thu, 31 Oct 2019 15:41:34 -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 v4 4/4] 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 | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/power/supply/max17040_battery.c b/drivers/power/supply/max17040_battery.c
index 802575342c72..0ed3d856e4f5 100644
--- a/drivers/power/supply/max17040_battery.c
+++ b/drivers/power/supply/max17040_battery.c
@@ -210,10 +210,19 @@ 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);
 }
--
2.24.0.rc2