linux-kernel - [PATCH 2/2] power: supply: bq2415x_charger: report charging state changes to userspace

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Message-ID: <20241128085759.11840-2-absicsz@gmail.com>
Date: Thu, 28 Nov 2024 10:57:28 +0200
From: "Sicelo A. Mhlongo" <absicsz@...il.com>
To: linux-pm@...r.kernel.org
Cc: pali@...nel.org,
	sre@...nel.org,
	linux-kernel@...r.kernel.org,
	maemo-leste@...ts.dyne.org,
	"Sicelo A. Mhlongo" <absicsz@...il.com>
Subject: [PATCH 2/2] power: supply: bq2415x_charger: report charging state changes to userspace

Continuously track the charging status register in order to send uevents
whenever the state changes. Generate an uevent also when the chip's OTG
line is toggled, in bq2415x_notifier_call().

Signed-off-by: Sicelo A. Mhlongo <absicsz@...il.com>
---
 drivers/power/supply/bq2415x_charger.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/power/supply/bq2415x_charger.c b/drivers/power/supply/bq2415x_charger.c
index 1a02195769a3..0234f7724872 100644
--- a/drivers/power/supply/bq2415x_charger.c
+++ b/drivers/power/supply/bq2415x_charger.c
@@ -171,6 +171,7 @@ struct bq2415x_device {
 	char *name;
 	int autotimer;	/* 1 - if driver automatically reset timer, 0 - not */
 	int automode;	/* 1 - enabled, 0 - disabled; -1 - not supported */
+	int charge_status;
 	int id;
 };
 
@@ -835,6 +836,8 @@ static int bq2415x_notifier_call(struct notifier_block *nb,
 	if (!bq2415x_update_reported_mode(bq, prop.intval))
 		return NOTIFY_OK;
 
+	power_supply_changed(bq->charger);
+
 	/* if automode is not enabled do not tell about reported_mode */
 	if (bq->automode < 1)
 		return NOTIFY_OK;
@@ -889,12 +892,19 @@ static void bq2415x_timer_work(struct work_struct *work)
 	int ret;
 	int error;
 	int boost;
+	int charge;
 
 	if (bq->automode > 0 && (bq->reported_mode != bq->mode)) {
 		sysfs_notify(&bq->charger->dev.kobj, NULL, "reported_mode");
 		bq2415x_set_mode(bq, bq->reported_mode);
 	}
 
+	charge = bq2415x_exec_command(bq, BQ2415X_CHARGE_STATUS);
+	if (bq->charge_status != charge) {
+		power_supply_changed(bq->charger);
+		bq->charge_status = charge;
+	}
+
 	if (!bq->autotimer)
 		return;
 
-- 
2.45.2