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stm-sensors-hal-iio Android multi-hal 2.x

Introduction

This is the documentation page for the Android multi-hal 2.x components of the sensors-hal iio.

Configuration

Default settings

Default parameters can be set at compile time by changing the Android.bp cflags (under core, see core documentation).

Build instructions

1> clone this repository into desired folder (i.e. hardware/st/sensors-hal):

git clone https://github.com/STMicroelectronics/st-mems-android-linux-sensors-hal.git hardware/st/sensors-hal

2> enable soong module (i.e. hardware/st/sensors-hal/multi-hal/Android.bp):

...
enabled: true,
...

3> create the hals.conf file (device/<vendor>/<board>/multi-hal/hals.conf) that lists the names of the sub-hals to load:

[email protected]

4> modify the device makefile (i.e. device/<vendor>/<board>/device.mk) by adding these lines:

# Build stm-sensors-hal with multi-hal 2.1 interface
PRODUCT_PACKAGES += \
	[email protected] \
	[email protected]

# Copy multi-hal config file
PRODUCT_COPY_FILES += \
	$(LOCAL_PATH)/multi-hal/hals.conf:$(TARGET_COPY_OUT_VENDOR)/etc/sensors/hals.conf

# Copy sensors config file(s)
PRODUCT_COPY_FILES += \
	frameworks/native/data/etc/android.hardware.sensor.accelerometer.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.hardware.sensor.accelerometer.xml \
	frameworks/native/data/etc/android.hardware.sensor.ambient_temperature.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.hardware.sensor.ambient_temperature.xml \
	frameworks/native/data/etc/android.hardware.sensor.compass.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.hardware.sensor.compass.xml \
	frameworks/native/data/etc/android.hardware.sensor.gyroscope.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.hardware.sensor.gyroscope.xml \
	frameworks/native/data/etc/android.hardware.sensor.hifi_sensors.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.hardware.sensor.hifi_sensors.xml \
	frameworks/native/data/etc/android.hardware.sensor.relative_humidity.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.hardware.sensor.relative_humidity.xml \
	frameworks/native/data/etc/android.hardware.sensor.stepcounter.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.hardware.sensor.stepcounter.xml \
	frameworks/native/data/etc/android.hardware.sensor.stepdetector.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.hardware.sensor.stepdetector.xml

5> modify the sepolicy file_contexts file (i.e. device/<vendor>/<board>/sepolicy/file_contexts) by adding these lines:

/vendor/bin/hw/android\.hardware\.sensors@2\.1-service\.multihal  u:object_r:hal_sensors_default_exec:s0

6> modify the sepolicy hal_sensors.te file (i.e. device/<vendor>/<board>/sepolicy/hal_sensors.te) by adding these lines:

# allow access to sysfs device iio
allow hal_sensors_default sysfs:dir { open read };
allow hal_sensors_default sysfs:file { open read write getattr };
allow hal_sensors_default sensors_device:chr_file rw_file_perms;

7> modify the uevent rules file (i.e. device/<vendor>/<board>/ueventd.rc) by adding these lines:

#common iio char devices
/dev/iio:device* 0666 system system

#sensors common
/sys/bus/iio/devices/iio:device* buffer/enable 0666 system system
/sys/bus/iio/devices/iio:device* buffer/length 0666 system system
/sys/bus/iio/devices/iio:device* sampling_frequency 0666 system system
/sys/bus/iio/devices/iio:device* hwfifo_flush 0666 system system
/sys/bus/iio/devices/iio:device* hwfifo_enabled 0666 system system
/sys/bus/iio/devices/iio:device* hwfifo_watermark 0666 system system
/sys/bus/iio/devices/iio:device* injection_mode 0666 system system
/sys/bus/iio/devices/iio:device* current_timestamp_clock 0666 system system
/sys/bus/iio/devices/iio:device* scan_elements/in_timestamp_en 0666 system system
/sys/bus/iio/devices/iio:device* scan_elements/in_count_en 0666 system system

#accelerometer sensor
/sys/bus/iio/devices/iio:device* in_accel_x_scale 0666 system system
/sys/bus/iio/devices/iio:device* in_accel_y_scale 0666 system system
/sys/bus/iio/devices/iio:device* in_accel_z_scale 0666 system system
/sys/bus/iio/devices/iio:device* scan_elements/in_accel_x_en 0666 system system
/sys/bus/iio/devices/iio:device* scan_elements/in_accel_y_en 0666 system system
/sys/bus/iio/devices/iio:device* scan_elements/in_accel_z_en 0666 system system

#gyroscope sensor
/sys/bus/iio/devices/iio:device* in_anglvel_x_scale 0666 system system
/sys/bus/iio/devices/iio:device* in_anglvel_y_scale 0666 system system
/sys/bus/iio/devices/iio:device* in_anglvel_z_scale 0666 system system
/sys/bus/iio/devices/iio:device* scan_elements/in_anglvel_x_en 0666 system system
/sys/bus/iio/devices/iio:device* scan_elements/in_anglvel_y_en 0666 system system
/sys/bus/iio/devices/iio:device* scan_elements/in_anglvel_z_en 0666 system system

#magnetometer sensor
/sys/bus/iio/devices/iio:device* in_magn_x_scale 0666 system system
/sys/bus/iio/devices/iio:device* in_magn_y_scale 0666 system system
/sys/bus/iio/devices/iio:device* in_magn_z_scale 0666 system system
/sys/bus/iio/devices/iio:device* scan_elements/in_magn_x_en 0666 system system
/sys/bus/iio/devices/iio:device* scan_elements/in_magn_y_en 0666 system system
/sys/bus/iio/devices/iio:device* scan_elements/in_magn_z_en 0666 system system

#step counter sensor
/sys/bus/iio/devices/iio:device* scan_elements/in_step_counter_en 0666 system system
/sys/bus/iio/devices/iio:device* max_delivery_rate 0666 system system

#temperature sensor
/sys/bus/iio/devices/iio:device* scan_elements/in_temp_en 0666 system system

#gesture sensor
/sys/bus/iio/devices/iio:device* scan_elements/in_gesture_en 0666 system system

#pressure sensor
/sys/bus/iio/devices/iio:device* scan_elements/in_pressure_en 0666 system system

#humidity sensor
/sys/bus/iio/devices/iio:device* scan_elements/in_humidityrelative_en 0666 system system

8> build aosp as described into official documentation.