Replace manual strcmp() logic with sysfs_match_string() to simplify
the mode selection process. This reduces boilerplate code and
leverages standard kernel helper functions for string matching.

Signed-off-by: Md. Mahmudul Hasan Mabud <mdmahmudulhasan1511@gmail.com>
---
 drivers/staging/iio/adc/ad7816.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/iio/adc/ad7816.c b/drivers/staging/iio/adc/ad7816.c
index 9a2f60b97..253ef2262 100644
--- a/drivers/staging/iio/adc/ad7816.c
+++ b/drivers/staging/iio/adc/ad7816.c
@@ -59,6 +59,11 @@ enum ad7816_type {
 	ID_AD7818,
 };
 
+static const char * const ad7816_modes[] = {
+	[AD7816_FULL] = "full",
+	[AD7816_PD] = "power-save",
+};
+
 /*
  * ad7816 data access by SPI
  */
@@ -136,14 +141,14 @@ static ssize_t ad7816_store_mode(struct device *dev,
 {
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct ad7816_chip_info *chip = iio_priv(indio_dev);
+	int ret;
 
-	if (strcmp(buf, "full") == 0) {
-		gpiod_set_value(chip->rdwr_pin, 1);
-		chip->mode = AD7816_FULL;
-	} else {
-		gpiod_set_value(chip->rdwr_pin, 0);
-		chip->mode = AD7816_PD;
-	}
+	ret = sysfs_match_string(ad7816_modes, buf);
+	if (ret < 0)
+		return ret;
+
+	chip->mode = ret;
+	gpiod_set_value(chip->rdwr_pin, ret == AD7816_FULL);
 
 	return len;
 }
-- 
2.34.1