Commit 0149ba2d authored by Renato Lui Geh's avatar Renato Lui Geh Committed by Jonathan Cameron
Browse files

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: default avatarRenato Lui Geh <renatogeh@gmail.com>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent ae9f86fe

drivers/staging/iio/adc/ad7780.c

+5 −0
Original line number Diff line number Diff line
@@ -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;

}

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