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author | Linus Walleij <linus.walleij@linaro.org> | 2016-12-30 23:54:18 +0100 |
---|---|---|
committer | Jonathan Cameron <jic23@kernel.org> | 2016-12-31 14:35:04 +0000 |
commit | 65e4345c8ef8811bbb4860fe5f2df10646b7f2e1 (patch) | |
tree | acbe27a1509fc0ed28dd6eeecbc6f9eb9723dafb /drivers/iio/common/st_sensors | |
parent | 65c8aea07de11b6507efa175edb44bd8b4488218 (diff) | |
download | op-kernel-dev-65e4345c8ef8811bbb4860fe5f2df10646b7f2e1.zip op-kernel-dev-65e4345c8ef8811bbb4860fe5f2df10646b7f2e1.tar.gz |
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/st_sensors')
-rw-r--r-- | drivers/iio/common/st_sensors/st_sensors_core.c | 9 |
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 d5cf7f3..79c8c7c 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"); |