linux-kernel - [PATCH v1 1/2] power: supply: smb347-charger: Improve interrupt initialization

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Date:   Tue,  2 Mar 2021 13:10:26 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sebastian Reichel <sre@...nel.org>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1 1/2] power: supply: smb347-charger: Improve interrupt initialization

A previous commit attempted to fix IRQ usage in a case where interrupt
is failed to initialize, but it missed couple more cases that could be
improved. The interrupt could be undefined and then everything related
to interrupt shouldn't be touched by driver. Secondly, we shouldn't ignore
errors that aren't directly related to enabling interrupt in hardware,
like enabling h/w write-access or requesting interrupt. Improve interrupt
initialization in the driver in order to handle the missing cases.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/power/supply/smb347-charger.c | 58 +++++++++++++++++----------
 1 file changed, 36 insertions(+), 22 deletions(-)

diff --git a/drivers/power/supply/smb347-charger.c b/drivers/power/supply/smb347-charger.c
index 8cfbd8d6b478..ee13cd5d2b04 100644
--- a/drivers/power/supply/smb347-charger.c
+++ b/drivers/power/supply/smb347-charger.c
@@ -911,11 +911,14 @@ static int smb347_irq_init(struct smb347_charger *smb,
 {
 	int ret;
 
-	ret = devm_request_threaded_irq(smb->dev, client->irq, NULL,
-					smb347_interrupt, IRQF_ONESHOT,
-					client->name, smb);
-	if (ret < 0)
-		return ret;
+	smb->irq_unsupported = true;
+
+	/*
+	 * Interrupt pin is optional. If it is connected, we setup the
+	 * interrupt support here.
+	 */
+	if (!client->irq)
+		return 0;
 
 	ret = smb347_set_writable(smb, true);
 	if (ret < 0)
@@ -931,7 +934,25 @@ static int smb347_irq_init(struct smb347_charger *smb,
 
 	smb347_set_writable(smb, false);
 
-	return ret;
+	if (ret < 0) {
+		dev_warn(smb->dev, "failed to initialize IRQ: %d\n", ret);
+		dev_warn(smb->dev, "disabling IRQ support\n");
+		return 0;
+	}
+
+	ret = devm_request_threaded_irq(smb->dev, client->irq, NULL,
+					smb347_interrupt, IRQF_ONESHOT,
+					client->name, smb);
+	if (ret)
+		return ret;
+
+	smb->irq_unsupported = false;
+
+	ret = smb347_irq_enable(smb);
+	if (ret < 0)
+		return ret;
+
+	return 0;
 }
 
 /*
@@ -1120,9 +1141,13 @@ static int smb347_get_property(struct power_supply *psy,
 	struct i2c_client *client = to_i2c_client(smb->dev);
 	int ret;
 
-	disable_irq(client->irq);
+	if (!smb->irq_unsupported)
+		disable_irq(client->irq);
+
 	ret = smb347_get_property_locked(psy, prop, val);
-	enable_irq(client->irq);
+
+	if (!smb->irq_unsupported)
+		enable_irq(client->irq);
 
 	return ret;
 }
@@ -1339,20 +1364,9 @@ static int smb347_probe(struct i2c_client *client,
 	if (ret < 0)
 		return ret;
 
-	/*
-	 * Interrupt pin is optional. If it is connected, we setup the
-	 * interrupt support here.
-	 */
-	if (client->irq) {
-		ret = smb347_irq_init(smb, client);
-		if (ret < 0) {
-			dev_warn(dev, "failed to initialize IRQ: %d\n", ret);
-			dev_warn(dev, "disabling IRQ support\n");
-			smb->irq_unsupported = true;
-		} else {
-			smb347_irq_enable(smb);
-		}
-	}
+	ret = smb347_irq_init(smb, client);
+	if (ret)
+		return ret;
 
 	return 0;
 }
-- 
2.29.2