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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>
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@ -42,6 +42,8 @@
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#define AD7780_GAIN_MIDPOINT 64
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#define AD7780_FILTER_MIDPOINT 13350
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static const unsigned int ad778x_gain[2] = { 1, 128 };
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struct ad7780_chip_info {
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struct iio_chan_spec channel;
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unsigned int pattern_mask;
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@ -179,6 +181,9 @@ static int ad7780_postprocess_sample(struct ad_sigma_delta *sigma_delta,
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((raw_sample & chip_info->pattern_mask) != chip_info->pattern))
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return -EIO;
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if (chip_info->is_ad778x)
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st->gain = ad778x_gain[raw_sample & AD7780_GAIN];
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return 0;
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}
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