linux-kernel - [PATCH] iio: adc: lpc18xx_adc: Convert probe to device managed version

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Message-ID: <YWCOERbPXRrvaRN8@Andryuu.br>
Date:   Fri, 8 Oct 2021 15:29:37 -0300
From:   André Gustavo Nakagomi Lopez <andregnl@....br>
To:     jic23@...nel.org, lars@...afoo.de, vz@...ia.com
Cc:     linux-iio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, andregnl@....br
Subject: [PATCH] iio: adc: lpc18xx_adc: Convert probe to device managed
 version

The remove function and the goto sections are not necessary if devm
functions are used.

Convert device register to devm version. Add hook functions to release
device resources, and use them inside probe with devm_add_action,
which will release resources on driver detach.

To maintain the order of which device resources were released/reseted,
register the hook functions as soon as resources are obtained/initialized.
Since devres actions are called on driver detach, the remove
function and the error-handling goto sections are no longer necessary.

Signed-off-by: André Gustavo Nakagomi Lopez <andregnl@....br>
---
I was not able to test the patch due to the fact I do not have the necessary hardware.
 drivers/iio/adc/lpc18xx_adc.c | 60 +++++++++++++++++++----------------
 1 file changed, 33 insertions(+), 27 deletions(-)

diff --git a/drivers/iio/adc/lpc18xx_adc.c b/drivers/iio/adc/lpc18xx_adc.c
index 3566990ae87d..7b6ba5e4a003 100644
--- a/drivers/iio/adc/lpc18xx_adc.c
+++ b/drivers/iio/adc/lpc18xx_adc.c
@@ -115,6 +115,23 @@ static const struct iio_info lpc18xx_adc_info = {
 	.read_raw = lpc18xx_adc_read_raw,
 };
 
+static void lpc18xx_writel(void *data)
+{
+	struct lpc18xx_adc *adc = data;
+
+	writel(0, adc->base + LPC18XX_ADC_CR);
+}
+
+static void lpc18xx_clk_disable_unprepare(void *clk)
+{
+	clk_disable_unprepare(clk);
+}
+
+static void lpc18xx_regulator_disable(void *vref)
+{
+	regulator_disable(vref);
+}
+
 static int lpc18xx_adc_probe(struct platform_device *pdev)
 {
 	struct iio_dev *indio_dev;
@@ -163,46 +180,36 @@ static int lpc18xx_adc_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	ret = devm_add_action_or_reset(&pdev->dev, lpc18xx_regulator_disable, adc->vref);
+	if (ret)
+		return ret;
+
 	ret = clk_prepare_enable(adc->clk);
 	if (ret) {
 		dev_err(&pdev->dev, "unable to enable clock\n");
-		goto dis_reg;
+		return ret;
 	}
 
+	ret = devm_add_action_or_reset(&pdev->dev, lpc18xx_clk_disable_unprepare,
+				       adc->clk);
+	if (ret)
+		return ret;
+
 	adc->cr_reg = (clkdiv << LPC18XX_ADC_CR_CLKDIV_SHIFT) |
 			LPC18XX_ADC_CR_PDN;
 	writel(adc->cr_reg, adc->base + LPC18XX_ADC_CR);
 
-	ret = iio_device_register(indio_dev);
-	if (ret) {
-		dev_err(&pdev->dev, "unable to register device\n");
-		goto dis_clk;
-	}
+	ret = devm_add_action_or_reset(&pdev->dev, lpc18xx_writel, adc);
+	if (ret)
+		return ret;
 
-	return 0;
+	ret = devm_iio_device_register(&pdev->dev, indio_dev);
+	if (ret)
+		dev_err(&pdev->dev, "unable to register device\n");
 
-dis_clk:
-	writel(0, adc->base + LPC18XX_ADC_CR);
-	clk_disable_unprepare(adc->clk);
-dis_reg:
-	regulator_disable(adc->vref);
 	return ret;
 }
 
-static int lpc18xx_adc_remove(struct platform_device *pdev)
-{
-	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
-	struct lpc18xx_adc *adc = iio_priv(indio_dev);
-
-	iio_device_unregister(indio_dev);
-
-	writel(0, adc->base + LPC18XX_ADC_CR);
-	clk_disable_unprepare(adc->clk);
-	regulator_disable(adc->vref);
-
-	return 0;
-}
-
 static const struct of_device_id lpc18xx_adc_match[] = {
 	{ .compatible = "nxp,lpc1850-adc" },
 	{ /* sentinel */ }
@@ -211,7 +218,6 @@ MODULE_DEVICE_TABLE(of, lpc18xx_adc_match);
 
 static struct platform_driver lpc18xx_adc_driver = {
 	.probe	= lpc18xx_adc_probe,
-	.remove	= lpc18xx_adc_remove,
 	.driver	= {
 		.name = "lpc18xx-adc",
 		.of_match_table = lpc18xx_adc_match,
-- 
2.33.0