From 0149ba2d5b6d6799e6aeb1ae25773008745c1c5a Mon Sep 17 00:00:00 2001 From: Renato Lui Geh Date: Fri, 15 Mar 2019 23:13:13 -0300 Subject: [PATCH] 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 Signed-off-by: Jonathan Cameron --- drivers/staging/iio/adc/ad7780.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/staging/iio/adc/ad7780.c b/drivers/staging/iio/adc/ad7780.c index 0968a69e537e..abb30c161b00 100644 --- a/drivers/staging/iio/adc/ad7780.c +++ b/drivers/staging/iio/adc/ad7780.c @@ -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; } -- 2.11.0