iio: accel: kxsd9: Fix scaling bug

[ Upstream commit 307fe9dd11ae44d4f8881ee449a7cbac36e1f5de ]

All the scaling of the KXSD9 involves multiplication with a
fraction number < 1.

However the scaling value returned from IIO_INFO_SCALE was
unpredictable as only the micros of the value was assigned, and
not the integer part, resulting in scaling like this:

$cat in_accel_scale
-1057462640.011978

Fix this by assigning zero to the integer part.

Cc: stable@vger.kernel.org
Tested-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>

diff --git a/drivers/iio/accel/kxsd9.c b/drivers/iio/accel/kxsd9.c
index 6dfce7e722cb5bff32a963f1c61f9da085881fe3..2254f8509a695d6574dd71bdb5bfcdb7c34720a6 100644 (file)
--- a/drivers/iio/accel/kxsd9.c
+++ b/drivers/iio/accel/kxsd9.c
@@ -166,6 +166,7 @@ static int kxsd9_read_raw(struct iio_dev *indio_dev,
                ret = spi_w8r8(st->us, KXSD9_READ(KXSD9_REG_CTRL_C));
                if (ret)
                        goto error_ret;
+               *val = 0;
                *val2 = kxsd9_micro_scales[ret & KXSD9_FS_MASK];
                ret = IIO_VAL_INT_PLUS_MICRO;
                break;