[PATCH v4 4/9] iio: adc: mcp3911: use resource-managed version of iio_device_register

[Marcus Folkesson]

Keep using managed resources as much as possible.

Signed-off-by: Marcus Folkesson <marcus.folkesson@xxxxxxxxx>
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
---
 drivers/iio/adc/Kconfig   |  2 ++
 drivers/iio/adc/mcp3911.c | 51 ++++++++++++++++++++-------------------
 2 files changed, 28 insertions(+), 25 deletions(-)

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 7fe5930891e0..3b5db59f3931 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -718,6 +718,8 @@ config MCP3422
 config MCP3911
 	tristate "Microchip Technology MCP3911 driver"
 	depends on SPI
+	select IIO_BUFFER
+	select IIO_TRIGGERED_BUFFER
 	help
 	  Say yes here to build support for Microchip Technology's MCP3911
 	  analog to digital converter.
diff --git a/drivers/iio/adc/mcp3911.c b/drivers/iio/adc/mcp3911.c
index 890af7dca62d..00dadb1761dc 100644
--- a/drivers/iio/adc/mcp3911.c
+++ b/drivers/iio/adc/mcp3911.c
@@ -258,6 +258,18 @@ static int mcp3911_config(struct mcp3911 *adc)
 	return  mcp3911_write(adc, MCP3911_REG_CONFIG, configreg, 2);
 }
 
+static void mcp3911_cleanup_clock(void *_adc)
+{
+	struct mcp3911 *adc = _adc;
+	clk_disable_unprepare(adc->clki);
+}
+
+static void mcp3911_cleanup_regulator(void *_adc)
+{
+	struct mcp3911 *adc = _adc;
+	regulator_disable(adc->vref);
+}
+
 static int mcp3911_probe(struct spi_device *spi)
 {
 	struct iio_dev *indio_dev;
@@ -286,6 +298,11 @@ static int mcp3911_probe(struct spi_device *spi)
 		ret = regulator_enable(adc->vref);
 		if (ret)
 			return ret;
+
+		ret = devm_add_action_or_reset(&spi->dev,
+				mcp3911_cleanup_regulator, adc);
+		if (ret)
+			return ret;
 	}
 
 	adc->clki = devm_clk_get(&adc->spi->dev, NULL);
@@ -296,21 +313,25 @@ static int mcp3911_probe(struct spi_device *spi)
 			dev_err(&adc->spi->dev,
 				"failed to get adc clk (%ld)\n",
 				PTR_ERR(adc->clki));
-			ret = PTR_ERR(adc->clki);
-			goto reg_disable;
+			return PTR_ERR(adc->clki);
 		}
 	} else {
 		ret = clk_prepare_enable(adc->clki);
 		if (ret < 0) {
 			dev_err(&adc->spi->dev,
 				"Failed to enable clki: %d\n", ret);
-			goto reg_disable;
+			return ret;
 		}
+
+		ret = devm_add_action_or_reset(&spi->dev,
+				mcp3911_cleanup_clock, adc);
+		if (ret)
+			return ret;
 	}
 
 	ret = mcp3911_config(adc);
 	if (ret)
-		goto clk_disable;
+		return ret;
 
 	indio_dev->name = spi_get_device_id(spi)->name;
 	indio_dev->modes = INDIO_DIRECT_MODE;
@@ -322,31 +343,11 @@ static int mcp3911_probe(struct spi_device *spi)
 
 	mutex_init(&adc->lock);
 
-	ret = iio_device_register(indio_dev);
-	if (ret)
-		goto clk_disable;
-
-	return ret;
-
-clk_disable:
-	clk_disable_unprepare(adc->clki);
-reg_disable:
-	if (adc->vref)
-		regulator_disable(adc->vref);
-
-	return ret;
+	return devm_iio_device_register(&adc->spi->dev, indio_dev);
 }
 
 static void mcp3911_remove(struct spi_device *spi)
 {
-	struct iio_dev *indio_dev = spi_get_drvdata(spi);
-	struct mcp3911 *adc = iio_priv(indio_dev);
-
-	iio_device_unregister(indio_dev);
-
-	clk_disable_unprepare(adc->clki);
-	if (adc->vref)
-		regulator_disable(adc->vref);
 }
 
 static const struct of_device_id mcp3911_dt_ids[] = {
-- 
2.36.1