diff options
| author | Renato Lui Geh <renatogeh@gmail.com> | 2019-03-15 23:13:13 -0300 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2019-04-04 20:20:03 +0100 |
| commit | 0149ba2d5b6d6799e6aeb1ae25773008745c1c5a (patch) | |
| tree | 9fc8d7ae4713cc566ada7c6bcc75c84c15824c1c /drivers/staging/iio | |
| parent | ae9f86feb4294864cf7274acae6561ec4d95a7d0 (diff) | |
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>
Diffstat (limited to 'drivers/staging/iio')
| -rw-r--r-- | drivers/staging/iio/adc/ad7780.c | 5 |
1 files changed, 5 insertions, 0 deletions
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; } |