[PATCH v5] staging: iio: adc: ad7816: Use modern IIO attribute macros

Replace the legacy IIO_DEVICE_ATTR() macros with the modern
IIO_DEVICE_ATTR_RW() and IIO_DEVICE_ATTR_RO() macros.

This includes renaming driver-specific callback functions to
standard <name>_show() and <name>_store() formats.

Signed-off-by: Md. Mahmudul Hasan Mabud <[email protected]>
---
v5:
  - Converted to a standalone single patch (previously part of the v3/v4 series).
  - Updated commit message and fixed function header line lengths and wrapping based on Andy Shevchenko's feedback on v3.
    Link: https://lore.kernel.org/linux-iio/[email protected]/
v4:
  - Sent by mistake without updates.
v3:
  - Initial version (as patch 4/4 of the series).

 drivers/staging/iio/adc/ad7816.c | 64 ++++++++++++--------------------
 1 file changed, 24 insertions(+), 40 deletions(-)

diff --git a/drivers/staging/iio/adc/ad7816.c b/drivers/staging/iio/adc/ad7816.c
index 30644d2d7..62bbd7b34 100644
--- a/drivers/staging/iio/adc/ad7816.c
+++ b/drivers/staging/iio/adc/ad7816.c
@@ -116,9 +116,8 @@ static int ad7816_spi_write(struct ad7816_chip_info *chip, u8 data)
 	return ret;
 }
 
-static ssize_t ad7816_show_mode(struct device *dev,
-				struct device_attribute *attr,
-				char *buf)
+static ssize_t mode_show(struct device *dev, struct device_attribute *attr,
+			 char *buf)
 {
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct ad7816_chip_info *chip = iio_priv(indio_dev);
@@ -128,10 +127,8 @@ static ssize_t ad7816_show_mode(struct device *dev,
 	return sysfs_emit(buf, "full\n");
 }
 
-static ssize_t ad7816_store_mode(struct device *dev,
-				 struct device_attribute *attr,
-				 const char *buf,
-				 size_t len)
+static ssize_t mode_store(struct device *dev, struct device_attribute *attr,
+			  const char *buf, size_t len)
 {
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct ad7816_chip_info *chip = iio_priv(indio_dev);
@@ -147,24 +144,19 @@ static ssize_t ad7816_store_mode(struct device *dev,
 	return len;
 }
 
-static IIO_DEVICE_ATTR(mode, 0644,
-		ad7816_show_mode,
-		ad7816_store_mode,
-		0);
+static IIO_DEVICE_ATTR_RW(mode, 0);
 
-static ssize_t ad7816_show_available_modes(struct device *dev,
-					   struct device_attribute *attr,
-					   char *buf)
+static ssize_t available_modes_show(struct device *dev,
+				    struct device_attribute *attr,
+				    char *buf)
 {
 	return sysfs_emit(buf, "full\npower-save\n");
 }
 
-static IIO_DEVICE_ATTR(available_modes, 0444, ad7816_show_available_modes,
-			NULL, 0);
+static IIO_DEVICE_ATTR_RO(available_modes, 0);
 
-static ssize_t ad7816_show_channel(struct device *dev,
-				   struct device_attribute *attr,
-				   char *buf)
+static ssize_t channel_show(struct device *dev, struct device_attribute *attr,
+			    char *buf)
 {
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct ad7816_chip_info *chip = iio_priv(indio_dev);
@@ -172,10 +164,8 @@ static ssize_t ad7816_show_channel(struct device *dev,
 	return sysfs_emit(buf, "%d\n", chip->channel_id);
 }
 
-static ssize_t ad7816_store_channel(struct device *dev,
-				    struct device_attribute *attr,
-				    const char *buf,
-				    size_t len)
+static ssize_t channel_store(struct device *dev, struct device_attribute *attr,
+			     const char *buf, size_t len)
 {
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct ad7816_chip_info *chip = iio_priv(indio_dev);
@@ -205,14 +195,10 @@ static ssize_t ad7816_store_channel(struct device *dev,
 	return len;
 }
 
-static IIO_DEVICE_ATTR(channel, 0644,
-		ad7816_show_channel,
-		ad7816_store_channel,
-		0);
+static IIO_DEVICE_ATTR_RW(channel, 0);
 
-static ssize_t ad7816_show_value(struct device *dev,
-				 struct device_attribute *attr,
-				 char *buf)
+static ssize_t value_show(struct device *dev, struct device_attribute *attr,
+			  char *buf)
 {
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct ad7816_chip_info *chip = iio_priv(indio_dev);
@@ -236,7 +222,7 @@ static ssize_t ad7816_show_value(struct device *dev,
 	return sysfs_emit(buf, "%u\n", data);
 }
 
-static IIO_DEVICE_ATTR(value, 0444, ad7816_show_value, NULL, 0);
+static IIO_DEVICE_ATTR_RO(value, 0);
 
 static struct attribute *ad7816_attributes[] = {
 	&iio_dev_attr_available_modes.dev_attr.attr,
@@ -266,9 +252,8 @@ static irqreturn_t ad7816_event_handler(int irq, void *private)
 	return IRQ_HANDLED;
 }
 
-static ssize_t ad7816_show_oti(struct device *dev,
-			       struct device_attribute *attr,
-			       char *buf)
+static ssize_t oti_show(struct device *dev, struct device_attribute *attr,
+			char *buf)
 {
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct ad7816_chip_info *chip = iio_priv(indio_dev);
@@ -286,10 +271,10 @@ static ssize_t ad7816_show_oti(struct device *dev,
 	return sysfs_emit(buf, "%u\n", chip->oti_data[chip->channel_id]);
 }
 
-static inline ssize_t ad7816_set_oti(struct device *dev,
-				     struct device_attribute *attr,
-				     const char *buf,
-				     size_t len)
+static inline ssize_t oti_store(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf,
+				size_t len)
 {
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct ad7816_chip_info *chip = iio_priv(indio_dev);
@@ -327,8 +312,7 @@ static inline ssize_t ad7816_set_oti(struct device *dev,
 	return len;
 }
 
-static IIO_DEVICE_ATTR(oti, 0644,
-		       ad7816_show_oti, ad7816_set_oti, 0);
+static IIO_DEVICE_ATTR_RW(oti, 0);
 
 static struct attribute *ad7816_event_attributes[] = {
 	&iio_dev_attr_oti.dev_attr.attr,
-- 
2.34.1