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