linux-kernel - [PATCH 4.19 44/50] iio: adc: stm32-dfsdm: fix data type

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Message-Id: <20190918061228.175134274@linuxfoundation.org>
Date:   Wed, 18 Sep 2019 08:19:27 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Olivier Moysan <olivier.moysan@...com>,
        Fabrice Gasnier <fabrice.gasnier@...com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH 4.19 44/50] iio: adc: stm32-dfsdm: fix data type

From: Olivier Moysan <olivier.moysan@...com>

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@...com>
Fixes: e2e6771c6462 ("IIO: ADC: add STM32 DFSDM sigma delta ADC support")
Acked-by: Fabrice Gasnier <fabrice.gasnier@...com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iio/adc/stm32-dfsdm-adc.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/iio/adc/stm32-dfsdm-adc.c
+++ b/drivers/iio/adc/stm32-dfsdm-adc.c
@@ -981,11 +981,11 @@ static int stm32_dfsdm_adc_chan_init_one
 	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;