Messages in this thread Patch in this message | | | From | Dragos Bogdan <> | Subject | [PATCH] iio:ad7793: Fix the serial interface reset | Date | Mon, 4 Sep 2017 18:00:48 +0300 |
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The serial interface can be reset by writing 32 consecutive 1s to the device. The value of 'ret' is overwritten when ad7793_check_platform_data() is called, so it should be initialized to -1 only before doing the spi_write().
Fixes: commit 2edb769d246e ("iio:ad7793: Add support for the ad7798 and ad7799")
Signed-off-by: Dragos Bogdan <dragos.bogdan@analog.com> --- drivers/iio/adc/ad7793.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/adc/ad7793.c b/drivers/iio/adc/ad7793.c index e6706a09e100..8680abf72dd2 100644 --- a/drivers/iio/adc/ad7793.c +++ b/drivers/iio/adc/ad7793.c @@ -257,7 +257,7 @@ static int ad7793_setup(struct iio_dev *indio_dev, unsigned int vref_mv) { struct ad7793_state *st = iio_priv(indio_dev); - int i, ret = -1; + int i, ret; unsigned long long scale_uv; u32 id; @@ -266,6 +266,7 @@ static int ad7793_setup(struct iio_dev *indio_dev, return ret; /* reset the serial interface */ + ret = -1; ret = spi_write(st->sd.spi, (u8 *)&ret, sizeof(ret)); if (ret < 0) goto out; -- 2.11.0
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