diff options
| author | Peter Meerwald <pmeerw@pmeerw.net> | 2014-05-20 08:36:00 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-06-26 15:17:36 -0400 |
| commit | 5999ec53f60b270adf0a59edb63043fe60bc3464 (patch) | |
| tree | ed18d29f683c68fe300d72970fdd7eb4cb5d940f /drivers | |
| parent | 9ab8ee47dd0ebd1b51acaa40bc3281cc58af6f6f (diff) | |
iio: Fix two mpl3115 issues in measurement conversion
commit d29f592929489d0a7c414396fae28119f3d280e1 upstream.
(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
Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Reported-by: Robert Deliën <robert@delien.nl>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/iio/pressure/mpl3115.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/iio/pressure/mpl3115.c b/drivers/iio/pressure/mpl3115.c index ba6d0c520e6..01b2e0b1887 100644 --- a/drivers/iio/pressure/mpl3115.c +++ b/drivers/iio/pressure/mpl3115.c @@ -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, |