Modernize the driver by using IIO_DEVICE_ATTR_RW and
IIO_DEVICE_ATTR_RO macros. This involves renaming the callback
functions to standard <name>_show and <name>_store formats, making
the code cleaner and more maintainable.

Signed-off-by: Md. Mahmudul Hasan Mabud <mdmahmudulhasan1511@gmail.com>
---
 drivers/staging/iio/adc/ad7816.c | 72 ++++++++++++++------------------
 1 file changed, 32 insertions(+), 40 deletions(-)

diff --git a/drivers/staging/iio/adc/ad7816.c b/drivers/staging/iio/adc/ad7816.c
index f2486cb29..80f84e2bb 100644
--- a/drivers/staging/iio/adc/ad7816.c
+++ b/drivers/staging/iio/adc/ad7816.c
@@ -121,9 +121,9 @@ 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);
@@ -131,10 +131,10 @@ static ssize_t ad7816_show_mode(struct device *dev,
 	return sysfs_emit(buf, "%s\n", ad7816_modes[chip->mode]);
 }
 
-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);
@@ -150,24 +150,20 @@ 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);
@@ -175,10 +171,10 @@ 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);
@@ -208,14 +204,11 @@ 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);
@@ -239,7 +232,7 @@ 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,
@@ -269,9 +262,9 @@ 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);
@@ -289,10 +282,10 @@ 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);
@@ -330,8 +323,7 @@ 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

On Tue, Mar 31, 2026 at 12:17:10AM +0600, Md. Mahmudul Hasan Mabud wrote:
> Modernize the driver by using IIO_DEVICE_ATTR_RW and

IIO_DEVICE_ATTR_RW()

> IIO_DEVICE_ATTR_RO macros. This involves renaming the callback

IIO_DEVICE_ATTR_RO()

> functions to standard <name>_show and <name>_store formats, making

"...<name>_show() and <name>_store()..."

> the code cleaner and more maintainable.

...

> -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)

You can use room on the previous line(s)

static ssize_t mode_show(struct device *dev, struct device_attribute *attr,
			 char *buf)

...

> -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)

static ssize_t mode_store(struct device *dev, struct device_attribute *attr,
			  const char *buf, size_t len)

And so on...

...

> -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)

This is okay to leave as is, as it might be too long (over 80).

-- 
With Best Regards,
Andy Shevchenko