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iio: Fix two mpl3115 issues in measurement conversion

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(i) pressure is 20-bit unsigned, not signed; the buffer description
is incorrect; for raw reads, this is just cosmetic

(ii) temperature is 12-bit signed, not 16-bit; this affects
readout of temperatures below zero as the sign bit is incorrectly
processed

reported via private mail

Cc: stable@vger.kernel.org
Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Reported-by: Robert Deliën <robert@delien.nl>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Peter Meerwald 2014-05-20 08:36:00 +01:00 committed by Jonathan Cameron
parent c0a36f08f4
commit d29f592929
1 changed files with 3 additions and 3 deletions
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6
drivers/iio/pressure/mpl3115.c
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@ -98,7 +98,7 @@ static int mpl3115_read_raw(struct iio_dev *indio_dev,
mutex_unlock(&data->lock);
if (ret < 0)
return ret;
*val = sign_extend32(be32_to_cpu(tmp) >> 12, 23);
*val = be32_to_cpu(tmp) >> 12;
return IIO_VAL_INT;
case IIO_TEMP: /* in 0.0625 celsius / LSB */
mutex_lock(&data->lock);
@ -112,7 +112,7 @@ static int mpl3115_read_raw(struct iio_dev *indio_dev,
mutex_unlock(&data->lock);
if (ret < 0)
return ret;
*val = sign_extend32(be32_to_cpu(tmp) >> 20, 15);
*val = sign_extend32(be32_to_cpu(tmp) >> 20, 11);
return IIO_VAL_INT;
default:
return -EINVAL;
@ -185,7 +185,7 @@ static const struct iio_chan_spec mpl3115_channels[] = {
BIT(IIO_CHAN_INFO_SCALE),
.scan_index = 0,
.scan_type = {
.sign = 's',
.sign = 'u',
.realbits = 20,
.storagebits = 32,
.shift = 12,