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authorLinus Walleij <linus.walleij@linaro.org>2016-12-31 01:54:18 +0300
committerJonathan Cameron <jic23@kernel.org>2016-12-31 17:35:04 +0300
commit65e4345c8ef8811bbb4860fe5f2df10646b7f2e1 (patch)
treeacbe27a1509fc0ed28dd6eeecbc6f9eb9723dafb /drivers/iio/common
parent65c8aea07de11b6507efa175edb44bd8b4488218 (diff)
downloadlinux-65e4345c8ef8811bbb4860fe5f2df10646b7f2e1.tar.xz
iio: accel: st_accel: fix LIS3LV02 reading and scaling
The LIS3LV02 has a special bit that need to be set to get the read values left aligned. Before this patch we get gibberish like this: iio_generic_buffer -a -c10 -n lis3lv02dl_accel (...) 0.000000 -0.010042 -0.642688 19155832931907 0.000000 -0.010042 -0.642688 19155858751073 Which is because we read a raw value for 1g as 64 which is the nominal 1024 for 1g shifted 4 bits to the left by being right-aligned rather than left aligned. Since all other sensors are left aligned, add some code to set the special DAS (data alignment setting) bit to 1 so that the right value is now read like this: iio_generic_buffer -a -c10 -n lis3lv02dl_accel (...) 0.000000 -0.147095 -10.120135 24761614364956 -0.029419 -0.176514 -10.120135 24761631624540 The scaling was weird as well: we have a gain of 1000 for 1g and 3000 for 6g. I don't even remember how I came up with the old values but they are wrong. Fixes: 3acddf74f807 ("iio: st-sensors: add support for lis3lv02d accelerometer") Cc: Lorenzo Bianconi <lorenzo.bianconi@st.com> Cc: Giuseppe Barba <giuseppe.barba@st.com> Cc: Denis Ciocca <denis.ciocca@st.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/common')
-rw-r--r--drivers/iio/common/st_sensors/st_sensors_core.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/iio/common/st_sensors/st_sensors_core.c b/drivers/iio/common/st_sensors/st_sensors_core.c
index d5cf7f31eaf9..79c8c7cd70d5 100644
--- a/drivers/iio/common/st_sensors/st_sensors_core.c
+++ b/drivers/iio/common/st_sensors/st_sensors_core.c
@@ -401,6 +401,15 @@ int st_sensors_init_sensor(struct iio_dev *indio_dev,
return err;
}
+ /* set DAS */
+ if (sdata->sensor_settings->das.addr) {
+ err = st_sensors_write_data_with_mask(indio_dev,
+ sdata->sensor_settings->das.addr,
+ sdata->sensor_settings->das.mask, 1);
+ if (err < 0)
+ return err;
+ }
+
if (sdata->int_pin_open_drain) {
dev_info(&indio_dev->dev,
"set interrupt line to open drain mode\n");