linux-kernel - [PATCH] driver: pca953x: avoid error message when resuming

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Date:   Mon,  7 Mar 2022 11:19:55 -0300
From:   Alifer Moraes <alifer.m@...iscite.com>
To:     linux-kernel@...r.kernel.org
Cc:     brgl@...ev.pl, eran.m@...iscite.com, linus.walleij@...aro.org,
        linux-gpio@...r.kernel.org, pierluigi.p@...iscite.com,
        FrancescoFerraro <francesco.f@...iscite.com>,
        Alifer Moraes <alifer.m@...iscite.com>
Subject: [PATCH] driver: pca953x: avoid error message when resuming

From: FrancescoFerraro <francesco.f@...iscite.com>

Avoids the error messages "pca953x 1-0020: failed reading register"
when resuming from suspend using gpio-key attached to pca9534.

Signed-off-by: Francesco Ferraro <francesco.f@...iscite.com>
Signed-off-by: Alifer Moraes <alifer.m@...iscite.com>
---
 drivers/gpio/gpio-pca953x.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index d2fe76f3f34f..4f35b75dcbb1 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -211,6 +211,7 @@ struct pca953x_chip {
 	struct regulator *regulator;
 
 	const struct pca953x_reg_config *regs;
+	int is_in_suspend;
 };
 
 static int pca953x_bank_shift(struct pca953x_chip *chip)
@@ -412,7 +413,8 @@ static int pca953x_read_regs(struct pca953x_chip *chip, int reg, unsigned long *
 
 	ret = regmap_bulk_read(chip->regmap, regaddr, value, NBANK(chip));
 	if (ret < 0) {
-		dev_err(&chip->client->dev, "failed reading register\n");
+		if (!chip->is_in_suspend)
+			dev_err(&chip->client->dev, "failed reading register\n");
 		return ret;
 	}
 
@@ -954,6 +956,7 @@ static int pca953x_probe(struct i2c_client *client,
 	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
 	if (chip == NULL)
 		return -ENOMEM;
+	chip->is_in_suspend = 0;
 
 	pdata = dev_get_platdata(&client->dev);
 	if (pdata) {
@@ -1161,6 +1164,8 @@ static int pca953x_suspend(struct device *dev)
 	else
 		regulator_disable(chip->regulator);
 
+	chip->is_in_suspend = 1;
+
 	return 0;
 }
 
@@ -1189,6 +1194,8 @@ static int pca953x_resume(struct device *dev)
 		return ret;
 	}
 
+	chip->is_in_suspend = 0;
+
 	return 0;
 }
 #endif
-- 
2.25.1