Redefine AD7816_FULL and AD7816_PD constants to start from 0 instead
of 1. This change is necessary to use these constants as direct
indices for the mode string array and to align with standard
indexing in modern sysfs helpers.

Signed-off-by: Md. Mahmudul Hasan Mabud <mdmahmudulhasan1511@gmail.com>
---
 drivers/staging/iio/adc/ad7816.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/iio/adc/ad7816.c b/drivers/staging/iio/adc/ad7816.c
index 172acf135..9a2f60b97 100644
--- a/drivers/staging/iio/adc/ad7816.c
+++ b/drivers/staging/iio/adc/ad7816.c
@@ -22,8 +22,9 @@
 /*
  * AD7816 config masks
  */
-#define AD7816_FULL			0x1
-#define AD7816_PD			0x2
+#define AD7816_FULL			0
+#define AD7816_PD			1
+
 #define AD7816_CS_MASK			0x7
 #define AD7816_CS_MAX			0x4
 
-- 
2.34.1