[PATCH v2 1/2] staging: iio: ad7780: check if ad778x before gain update

[Giuliano Belinassi]

Only the ad778x have the 'gain' status bit. Check it before updating
through a new variable is_ad778x in chip_info.

Signed-off-by: Giuliano Belinassi <giuliano.belina...@usp.br>
---
Changes in v2:
        - Squashed is_ad778x declaration commit with the ad778x checkage
        - Changed is_ad778x type to bool
 
 drivers/staging/iio/adc/ad7780.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/iio/adc/ad7780.c b/drivers/staging/iio/adc/ad7780.c
index 91e016d534ed..9ec2b002539e 100644
--- a/drivers/staging/iio/adc/ad7780.c
+++ b/drivers/staging/iio/adc/ad7780.c
@@ -35,6 +35,7 @@ struct ad7780_chip_info {
        struct iio_chan_spec    channel;
        unsigned int            pattern_mask;
        unsigned int            pattern;
+       bool                    is_ad778x;
 };
 
 struct ad7780_state {
@@ -113,10 +114,12 @@ static int ad7780_postprocess_sample(struct 
ad_sigma_delta *sigma_delta,
            ((raw_sample & chip_info->pattern_mask) != chip_info->pattern))
                return -EIO;
 
-       if (raw_sample & AD7780_GAIN)
-               st->gain = 1;
-       else
-               st->gain = 128;
+       if (chip_info->is_ad778x) {
+               if (raw_sample & AD7780_GAIN)
+                       st->gain = 1;
+               else
+                       st->gain = 128;
+       }
 
        return 0;
 }
@@ -135,21 +138,25 @@ static const struct ad7780_chip_info 
ad7780_chip_info_tbl[] = {
                .channel = AD7780_CHANNEL(12, 24),
                .pattern = 0x5,
                .pattern_mask = 0x7,
+               .is_ad778x = false,
        },
        [ID_AD7171] = {
                .channel = AD7780_CHANNEL(16, 24),
                .pattern = 0x5,
                .pattern_mask = 0x7,
+               .is_ad778x = false,
        },
        [ID_AD7780] = {
                .channel = AD7780_CHANNEL(24, 32),
                .pattern = 0x1,
                .pattern_mask = 0x3,
+               .is_ad778x = true,
        },
        [ID_AD7781] = {
                .channel = AD7780_CHANNEL(20, 32),
                .pattern = 0x1,
                .pattern_mask = 0x3,
+               .is_ad778x = true,
        },
 };
 
-- 
2.19.1

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