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Date:   Sun, 21 Oct 2018 11:49:28 +0530
From:   Nishad Kamdar <nishadkamdar@gmail.com>
To:     Lars-Peter Clausen <lars@metafoo.de>
Cc:     Michael Hennerich <Michael.Hennerich@analog.com>,
        Jonathan Cameron <jic23@kernel.org>,
        Hartmut Knaack <knaack.h@gmx.de>,
        Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-iio@vger.kernel.org, devel@driverdev.osuosl.org,
        linux-kernel@vger.kernel.org, outreachy-kernel@googlegroups.com
Subject: [PATCH] staging: iio: ad2s1210: Switch to the gpio descriptor
 interface
Message-ID: <20181021061924.GA11073@nishad>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
User-Agent: Mutt/1.9.4 (2018-02-28)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Use the gpiod interface instead of the deprecated old non-descriptor
interface.

Signed-off-by: Nishad Kamdar <nishadkamdar@gmail.com>
---
 drivers/staging/iio/resolver/ad2s1210.c | 110 +++++++++++++++---------
 drivers/staging/iio/resolver/ad2s1210.h |   3 -
 2 files changed, 71 insertions(+), 42 deletions(-)

diff --git a/drivers/staging/iio/resolver/ad2s1210.c b/drivers/staging/iio/resolver/ad2s1210.c
index ac13b99bd9cb..ed372a5f9130 100644
--- a/drivers/staging/iio/resolver/ad2s1210.c
+++ b/drivers/staging/iio/resolver/ad2s1210.c
@@ -15,7 +15,7 @@
 #include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/delay.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/module.h>
 
 #include <linux/iio/iio.h>
@@ -73,6 +73,11 @@ struct ad2s1210_state {
 	const struct ad2s1210_platform_data *pdata;
 	struct mutex lock;
 	struct spi_device *sdev;
+	struct gpio_desc *sample;
+	struct gpio_desc *a0;
+	struct gpio_desc *a1;
+	struct gpio_desc *res0;
+	struct gpio_desc *res1;
 	unsigned int fclkin;
 	unsigned int fexcit;
 	bool hysteresis;
@@ -91,8 +96,8 @@ static const int ad2s1210_mode_vals[4][2] = {
 static inline void ad2s1210_set_mode(enum ad2s1210_mode mode,
 				     struct ad2s1210_state *st)
 {
-	gpio_set_value(st->pdata->a[0], ad2s1210_mode_vals[mode][0]);
-	gpio_set_value(st->pdata->a[1], ad2s1210_mode_vals[mode][1]);
+	gpiod_set_value(st->a0, ad2s1210_mode_vals[mode][0]);
+	gpiod_set_value(st->a1, ad2s1210_mode_vals[mode][1]);
 	st->mode = mode;
 }
 
@@ -152,8 +157,8 @@ int ad2s1210_update_frequency_control_word(struct ad2s1210_state *st)
 
 static unsigned char ad2s1210_read_resolution_pin(struct ad2s1210_state *st)
 {
-	int resolution = (gpio_get_value(st->pdata->res[0]) << 1) |
-			  gpio_get_value(st->pdata->res[1]);
+	int resolution = (gpiod_get_value(st->res0) << 1) |
+			  gpiod_get_value(st->res1);
 
 	return ad2s1210_resolution_value[resolution];
 }
@@ -164,10 +169,10 @@ static const int ad2s1210_res_pins[4][2] = {
 
 static inline void ad2s1210_set_resolution_pin(struct ad2s1210_state *st)
 {
-	gpio_set_value(st->pdata->res[0],
-		       ad2s1210_res_pins[(st->resolution - 10) / 2][0]);
-	gpio_set_value(st->pdata->res[1],
-		       ad2s1210_res_pins[(st->resolution - 10) / 2][1]);
+	gpiod_set_value(st->res0,
+			ad2s1210_res_pins[(st->resolution - 10) / 2][0]);
+	gpiod_set_value(st->res1,
+			ad2s1210_res_pins[(st->resolution - 10) / 2][1]);
 }
 
 static inline int ad2s1210_soft_reset(struct ad2s1210_state *st)
@@ -401,15 +406,15 @@ static ssize_t ad2s1210_clear_fault(struct device *dev,
 	int ret;
 
 	mutex_lock(&st->lock);
-	gpio_set_value(st->pdata->sample, 0);
+	gpiod_set_value(st->sample, 0);
 	/* delay (2 * tck + 20) nano seconds */
 	udelay(1);
-	gpio_set_value(st->pdata->sample, 1);
+	gpiod_set_value(st->sample, 1);
 	ret = ad2s1210_config_read(st, AD2S1210_REG_FAULT);
 	if (ret < 0)
 		goto error_ret;
-	gpio_set_value(st->pdata->sample, 0);
-	gpio_set_value(st->pdata->sample, 1);
+	gpiod_set_value(st->sample, 0);
+	gpiod_set_value(st->sample, 1);
 error_ret:
 	mutex_unlock(&st->lock);
 
@@ -466,7 +471,7 @@ static int ad2s1210_read_raw(struct iio_dev *indio_dev,
 	s16 vel;
 
 	mutex_lock(&st->lock);
-	gpio_set_value(st->pdata->sample, 0);
+	gpiod_set_value(st->sample, 0);
 	/* delay (6 * tck + 20) nano seconds */
 	udelay(1);
 
@@ -512,7 +517,7 @@ static int ad2s1210_read_raw(struct iio_dev *indio_dev,
 	}
 
 error_ret:
-	gpio_set_value(st->pdata->sample, 1);
+	gpiod_set_value(st->sample, 1);
 	/* delay (2 * tck + 20) nano seconds */
 	udelay(1);
 	mutex_unlock(&st->lock);
@@ -628,32 +633,59 @@ static const struct iio_info ad2s1210_info = {
 	.attrs = &ad2s1210_attribute_group,
 };
 
-static int ad2s1210_setup_gpios(struct ad2s1210_state *st)
+static int ad2s1210_setup_gpios(struct spi_device *spi,
+				struct ad2s1210_state *st)
 {
-	unsigned long flags = st->pdata->gpioin ? GPIOF_DIR_IN : GPIOF_DIR_OUT;
-	struct gpio ad2s1210_gpios[] = {
-		{ st->pdata->sample, GPIOF_DIR_IN, "sample" },
-		{ st->pdata->a[0], flags, "a0" },
-		{ st->pdata->a[1], flags, "a1" },
-		{ st->pdata->res[0], flags, "res0" },
-		{ st->pdata->res[0], flags, "res1" },
-	};
+	int ret = 0;
+	unsigned long flags = st->pdata->gpioin ? GPIOD_IN : GPIOD_OUT_LOW;
+
+	st->sample = devm_gpiod_get(&spi->dev, "sample", GPIOD_IN);
+	if (IS_ERR(st->sample)) {
+		ret = PTR_ERR(st->sample);
+		dev_err(&spi->dev, "Failed to request sample GPIO: %d\n",
+			ret);
+		return ret;
+	}
+	st->a0 = devm_gpiod_get(&spi->dev, "a0", flags);
+	if (IS_ERR(st->a0)) {
+		ret = PTR_ERR(st->a0);
+		dev_err(&spi->dev, "Failed to request a0 GPIO: %d\n",
+			ret);
+		return ret;
+	}
+	st->a1 = devm_gpiod_get(&spi->dev, "a1", flags);
+	if (IS_ERR(st->a1)) {
+		ret = PTR_ERR(st->a1);
+		dev_err(&spi->dev, "Failed to request a1 GPIO: %d\n",
+			ret);
+		return ret;
+	}
+	st->res0 = devm_gpiod_get(&spi->dev, "res0", flags);
+	if (IS_ERR(st->res0)) {
+		ret = PTR_ERR(st->res0);
+		dev_err(&spi->dev, "Failed to request res0 GPIO: %d\n",
+			ret);
+		return ret;
+	}
+	st->res1 = devm_gpiod_get(&spi->dev, "res1", flags);
+	if (IS_ERR(st->res1)) {
+		ret = PTR_ERR(st->res1);
+		dev_err(&spi->dev, "Failed to request res1 GPIO: %d\n",
+			ret);
+		return ret;
+	}
 
-	return gpio_request_array(ad2s1210_gpios, ARRAY_SIZE(ad2s1210_gpios));
+	return ret;
 }
 
-static void ad2s1210_free_gpios(struct ad2s1210_state *st)
+static void ad2s1210_free_gpios(struct spi_device *spi,
+				struct ad2s1210_state *st)
 {
-	unsigned long flags = st->pdata->gpioin ? GPIOF_DIR_IN : GPIOF_DIR_OUT;
-	struct gpio ad2s1210_gpios[] = {
-		{ st->pdata->sample, GPIOF_DIR_IN, "sample" },
-		{ st->pdata->a[0], flags, "a0" },
-		{ st->pdata->a[1], flags, "a1" },
-		{ st->pdata->res[0], flags, "res0" },
-		{ st->pdata->res[0], flags, "res1" },
-	};
-
-	gpio_free_array(ad2s1210_gpios, ARRAY_SIZE(ad2s1210_gpios));
+	devm_gpiod_put(&spi->dev, st->sample);
+	devm_gpiod_put(&spi->dev, st->a0);
+	devm_gpiod_put(&spi->dev, st->a1);
+	devm_gpiod_put(&spi->dev, st->res0);
+	devm_gpiod_put(&spi->dev, st->res1);
 }
 
 static int ad2s1210_probe(struct spi_device *spi)
@@ -670,7 +702,7 @@ static int ad2s1210_probe(struct spi_device *spi)
 		return -ENOMEM;
 	st = iio_priv(indio_dev);
 	st->pdata = spi->dev.platform_data;
-	ret = ad2s1210_setup_gpios(st);
+	ret = ad2s1210_setup_gpios(spi, st);
 	if (ret < 0)
 		return ret;
 
@@ -702,7 +734,7 @@ static int ad2s1210_probe(struct spi_device *spi)
 	return 0;
 
 error_free_gpios:
-	ad2s1210_free_gpios(st);
+	ad2s1210_free_gpios(spi, st);
 	return ret;
 }
 
@@ -711,7 +743,7 @@ static int ad2s1210_remove(struct spi_device *spi)
 	struct iio_dev *indio_dev = spi_get_drvdata(spi);
 
 	iio_device_unregister(indio_dev);
-	ad2s1210_free_gpios(iio_priv(indio_dev));
+	ad2s1210_free_gpios(spi, iio_priv(indio_dev));
 
 	return 0;
 }
diff --git a/drivers/staging/iio/resolver/ad2s1210.h b/drivers/staging/iio/resolver/ad2s1210.h
index e9b2147701fc..63d479b20a6c 100644
--- a/drivers/staging/iio/resolver/ad2s1210.h
+++ b/drivers/staging/iio/resolver/ad2s1210.h
@@ -12,9 +12,6 @@
 #define _AD2S1210_H
 
 struct ad2s1210_platform_data {
-	unsigned int		sample;
-	unsigned int		a[2];
-	unsigned int		res[2];
 	bool			gpioin;
 };
 #endif /* _AD2S1210_H */
-- 
2.17.1