Commit 0ae0c43a authored Jun 19, 2019 by Olivier Moysan Committed by Greg Kroah-Hartman Sep 19, 2019

iio: adc: stm32-dfsdm: fix data type



commit c6013bf50e2a2a94ab3d012e191096432aa50c6f upstream.

Fix the data type as DFSDM raw output is complements 2,
24bits left aligned in a 32-bit register.
This change does not affect AUDIO path
- Set data as signed for IIO (as for AUDIO)
- Set 8 bit right shift for IIO.
The 8 LSBs bits of data contains channel info and are masked.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Fixes: e2e6771c ("IIO: ADC: add STM32 DFSDM sigma delta ADC support")
Acked-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent acf77c41

drivers/iio/adc/stm32-dfsdm-adc.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -981,11 +981,11 @@ static int stm32_dfsdm_adc_chan_init_one(struct iio_dev *indio_dev,
		ch->info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO);

		if (adc->dev_data->type == DFSDM_AUDIO) {
		ch->scan_type.sign = 's';
		ch->ext_info = dfsdm_adc_audio_ext_info;
		} else {
		ch->scan_type.sign = 'u';
		ch->scan_type.shift = 8;
		}
		ch->scan_type.sign = 's';
		ch->scan_type.realbits = 24;
		ch->scan_type.storagebits = 32;