From 5999ec53f60b270adf0a59edb63043fe60bc3464 Mon Sep 17 00:00:00 2001 From: Peter Meerwald Date: Tue, 20 May 2014 08:36:00 +0100 Subject: [PATCH] iio: Fix two mpl3115 issues in measurement conversion MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Reported-by: Robert Deliën Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/iio/pressure/mpl3115.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/iio/pressure/mpl3115.c b/drivers/iio/pressure/mpl3115.c index ba6d0c5..01b2e0b 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, -- 1.9.1