staging:iio:ad7780: add chip ID values and mask

The ad7780 supports both the ad778x and ad717x families. Each chip has
a corresponding ID. This patch provides a mask for extracting ID values
from the status bits and also macros for the correct values for the
ad7170, ad7171, ad7780 and ad7781.

Signed-off-by: Renato Lui Geh <renatogeh@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/staging/iio/adc/ad7780.c b/drivers/staging/iio/adc/ad7780.c
index 8ee1f88..f064dcf 100644 (file)
--- a/drivers/staging/iio/adc/ad7780.c
+++ b/drivers/staging/iio/adc/ad7780.c
@@ -30,6 +30,12 @@
 #define AD7780_ID0             BIT(3)
 #define AD7780_GAIN            BIT(2)
 
+#define AD7170_ID              0
+#define AD7171_ID              1
+#define AD7780_ID              1
+#define AD7781_ID              0
+
+#define AD7780_ID_MASK         (AD7780_ID0 | AD7780_ID1)
 
 #define AD7780_PATTERN_GOOD    1
 #define AD7780_PATTERN_MASK    GENMASK(1, 0)