44a76de8ca
Scaling factor values for Acc lead to an unacceptable rounding of the full scale (FS) calculated by some SensorHAL on Android devices. For examples setting FS to 4g the in_accel_x_scale, in_accel_y_scale and in_accel_z_scale are 0.001196 on 6 decimal digits and the FS is 0.001196 × ((2^15) − 1) ~= 39.1893 m/s^2. Android CTS R10 SensorParameterRangeTest test expects a value greater than 39.20 m/s^2 so this test fails (ACCELEROMETER_MAX_RANGE = 4 * 9.80). Using 9 decimal digits the new scale factor is 0.001196411 and the FS now is 0.001196411 × ((2^15)−1) ~= 39.2028 m/s^2. This patch extends to IIO_VAL_INT_PLUS_NANO type the scaling factor to all IMU devices where SensorParameterRangeTest CTS test fails. Signed-off-by: Mario Tesi <mario.tesi@st.com> Acked-by: Lorenzo Bianconi <lorenzo@kernel.org> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Link: https://lore.kernel.org/r/1600361236-2285-1-git-send-email-martepisa@gmail.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.