linux-kernel - [PATCH v2] iio: adc: mcp320x: Simplify device removal logic

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Date: Mon, 19 Feb 2024 09:41:40 +0200
From: Arturas Moskvinas <arturas.moskvinas@...il.com>
To: jic23@...nel.org,
	Jonathan.Cameron@...wei.com,
	oskar.andero@...il.com,
	lars@...afoo.de,
	lukas@...ner.de
Cc: linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Arturas Moskvinas <arturas.moskvinas@...il.com>
Subject: [PATCH v2] iio: adc: mcp320x: Simplify device removal logic

Use devm_* APIs to enable/disable regulator and to register in IIO infrastructure.

Signed-off-by: Arturas Moskvinas <arturas.moskvinas@...il.com>

---
v1 -> v2:
- Use devm_add_action_or_reset instead of devm_regulator_get_enable to automate disabling regulator
- Remove empty mcp320x_remove function
---
 drivers/iio/adc/mcp320x.c | 29 +++++++++--------------------
 1 file changed, 9 insertions(+), 20 deletions(-)

diff --git a/drivers/iio/adc/mcp320x.c b/drivers/iio/adc/mcp320x.c
index f3b81798b3c9..da1421bd7b62 100644
--- a/drivers/iio/adc/mcp320x.c
+++ b/drivers/iio/adc/mcp320x.c
@@ -371,6 +371,11 @@ static const struct mcp320x_chip_info mcp320x_chip_infos[] = {
 	},
 };
 
+static void mcp320x_regulator_disable(void *reg)
+{
+	regulator_disable(reg);
+}
+
 static int mcp320x_probe(struct spi_device *spi)
 {
 	struct iio_dev *indio_dev;
@@ -388,7 +393,6 @@ static int mcp320x_probe(struct spi_device *spi)
 	indio_dev->name = spi_get_device_id(spi)->name;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->info = &mcp320x_info;
-	spi_set_drvdata(spi, indio_dev);
 
 	device_index = spi_get_device_id(spi)->driver_data;
 	chip_info = &mcp320x_chip_infos[device_index];
@@ -445,27 +449,13 @@ static int mcp320x_probe(struct spi_device *spi)
 	if (ret < 0)
 		return ret;
 
-	mutex_init(&adc->lock);
-
-	ret = iio_device_register(indio_dev);
+	ret = devm_add_action_or_reset(&spi->dev, mcp320x_regulator_disable, adc->reg);
 	if (ret < 0)
-		goto reg_disable;
-
-	return 0;
-
-reg_disable:
-	regulator_disable(adc->reg);
-
-	return ret;
-}
+		return ret;
 
-static void mcp320x_remove(struct spi_device *spi)
-{
-	struct iio_dev *indio_dev = spi_get_drvdata(spi);
-	struct mcp320x *adc = iio_priv(indio_dev);
+	mutex_init(&adc->lock);
 
-	iio_device_unregister(indio_dev);
-	regulator_disable(adc->reg);
+	return devm_iio_device_register(&spi->dev, indio_dev);
 }
 
 static const struct of_device_id mcp320x_dt_ids[] = {
@@ -520,7 +510,6 @@ static struct spi_driver mcp320x_driver = {
 		.of_match_table = mcp320x_dt_ids,
 	},
 	.probe = mcp320x_probe,
-	.remove = mcp320x_remove,
 	.id_table = mcp320x_id,
 };
 module_spi_driver(mcp320x_driver);

base-commit: 8d3dea210042f54b952b481838c1e7dfc4ec751d
-- 
2.43.2