linux/drivers/iio/common/st_sensors
Linus Walleij 65e4345c8e 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: 3acddf74f8 ("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>
2016-12-31 14:35:04 +00:00
..
Kconfig
Makefile
st_sensors_buffer.c iio: common: st_sensors: fix channel data parsing 2016-12-31 14:32:09 +00:00
st_sensors_core.c iio: accel: st_accel: fix LIS3LV02 reading and scaling 2016-12-31 14:35:04 +00:00
st_sensors_core.h iio: st_sensors: support active-low interrupts 2016-01-10 12:35:32 +00:00
st_sensors_i2c.c iio:st_sensors: emulate SMBus block read if needed 2016-05-29 16:04:17 +01:00
st_sensors_spi.c
st_sensors_trigger.c fix:iio:common:st_sensors:st_sensors_trigger:mark symbols static where possible 2016-08-29 20:13:12 +01:00