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staging: iio: ad7780: add gain reading to ad778x 

This patch adds a new functionality of reading gain values from the
ad778x chips. This value is stored in the chip's state struct and is
updated whenever a read or write call is performed on the driver.

Signed-off-by: Renato Lui Geh <renatogeh@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Renato Lui Geh 2019-03-15 23:13:13 -03:00 committed by Jonathan Cameron
parent ae9f86feb4
commit 0149ba2d5b
1 changed files with 5 additions and 0 deletions
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5
drivers/staging/iio/adc/ad7780.c
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@ -42,6 +42,8 @@
#define AD7780_GAIN_MIDPOINT 64
#define AD7780_FILTER_MIDPOINT 13350
static const unsigned int ad778x_gain[2] = { 1, 128 };
struct ad7780_chip_info {
struct iio_chan_spec channel;
unsigned int pattern_mask;
@ -179,6 +181,9 @@ static int ad7780_postprocess_sample(struct ad_sigma_delta *sigma_delta,
((raw_sample & chip_info->pattern_mask) != chip_info->pattern))
return -EIO;
if (chip_info->is_ad778x)
st->gain = ad778x_gain[raw_sample & AD7780_GAIN];
return 0;
}