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Diffstat (limited to 'modules/sensors/dynamic_sensor/README.md')
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diff --git a/modules/sensors/dynamic_sensor/README.md b/modules/sensors/dynamic_sensor/README.md new file mode 100644 index 00000000..5d5bd6d3 --- /dev/null +++ b/modules/sensors/dynamic_sensor/README.md @@ -0,0 +1,153 @@ +# Dynamic Sensors + +[TOC] + +## Links + +* [Sensor HAL dynamic sensor support](https://source.android.com/devices/sensors/sensors-hal2#dynamic-sensors) +* [Sensors Multi-HAL](https://source.android.com/devices/sensors/sensors-multihal) + +## Adding dynamic sensor support to a device + +A few files need to be modified to add dynamic sensor support to a device. The +dynamic sensor HAL must be enabled in the device product makefile and in the +sensor sub-HAL configuration file, raw HID devices must be configured, and raw +HID device and dynamic sensor property permissions must be set up in the SELinux +policy files. + +```shell +acme-co$ git -C device/acme/rocket-phone diff +diff --git a/sensor_hal/hals.conf b/sensor_hal/hals.conf +index a1f4b8b..d112546 100644 +--- a/sensor_hal/hals.conf ++++ b/sensor_hal/hals.conf +@@ -1 +1,2 @@ ++sensors.dynamic_sensor_hal.so + sensors.rocket-phone.so +diff --git a/rocket-phone.mk b/rocket-phone.mk +index 3fc8538..b1bd8a1 100644 +--- a/rocket-phone.mk ++++ b/rocket-phone.mk +@@ -73,6 +73,9 @@ + PRODUCT_PACKAGES += sensors.rocket-phone + PRODUCT_PACKAGES += thruster_stats + ++# Add the dynamic sensor HAL. ++PRODUCT_PACKAGES += sensors.dynamic_sensor_hal ++ + # Only install test tools in debug build or eng build. + ifneq ($(filter userdebug eng,$(TARGET_BUILD_VARIANT)),) + PRODUCT_PACKAGES += thruster_test +diff --git a/conf/ueventd.rc b/conf/ueventd.rc +index 88ee00b..2f03009 100644 +--- a/conf/ueventd.rc ++++ b/conf/ueventd.rc +@@ -209,3 +209,7 @@ + + # Thrusters + /dev/thruster* 0600 system system ++ ++# Raw HID devices ++/dev/hidraw* 0660 system system ++ +diff --git a/sepolicy/sensor_hal.te b/sepolicy/sensor_hal.te +index 0797253..22a4208 100644 +--- a/sepolicy/sensor_hal.te ++++ b/sepolicy/sensor_hal.te +@@ -52,6 +52,9 @@ + # Allow sensor HAL to read thruster state. + allow hal_sensors_default thruster_state:file r_file_perms; + ++# Allow access for dynamic sensor properties. ++get_prop(hal_sensors_default, vendor_dynamic_sensor_prop) ++ ++# Allow access to raw HID devices for dynamic sensors. ++allow hal_sensors_default device:dir r_dir_perms; ++allow hal_sensors_default hidraw_device:chr_file rw_file_perms; ++ + # + # Thruster sensor enforcements. + # +diff --git a/sepolicy/device.te b/sepolicy/device.te +index bc3c947..bad0be0 100644 +--- a/sepolicy/device.te ++++ b/sepolicy/device.te +@@ -55,3 +55,7 @@ + + # Thruster + type thruster_device, dev_type; ++ ++# Raw HID device ++type hidraw_device, dev_type; ++ +diff --git a/sepolicy/property.te b/sepolicy/property.te +index 4b671a4..bb0894f 100644 +--- a/sepolicy/property.te ++++ b/sepolicy/property.te +@@ -49,3 +49,7 @@ + + # Thruster + vendor_internal_prop(vendor_thruster_debug_prop) ++ ++# Dynamic sensor ++vendor_internal_prop(vendor_dynamic_sensor_prop) ++ +diff --git a/sepolicy/file_contexts b/sepolicy/file_contexts +index bc03a78..ff401dc 100644 +--- a/sepolicy/file_contexts ++++ b/sepolicy/file_contexts +@@ -441,3 +441,7 @@ + /dev/thruster-fuel u:object_r:thruster_device:s0 + /dev/thruster-output u:object_r:thruster_device:s0 + /dev/thruster-telemetry u:object_r:thruster_device:s0 ++ ++# Raw HID device ++/dev/hidraw[0-9]* u:object_r:hidraw_device:s0 ++ +diff --git a/sepolicy/property_contexts b/sepolicy/property_contexts +index 5d2f018..18a6059 100644 +--- a/sepolicy/property_contexts ++++ b/sepolicy/property_contexts +@@ -104,3 +104,7 @@ + + # Thruster + vendor.thruster.debug u:object_r:vendor_thruster_debug_prop:s0 ++ ++# Dynamic sensor ++vendor.dynamic_sensor. u:object_r:vendor_dynamic_sensor_prop:s0 ++ +acme-co$ +``` + +Once the file modifications are made, rebuild and flash. The dynamic sensor HAL +should be initialized and appear in the sensor service. + +```shell +acme-co$ make -j28 && fastboot flashall +. +. +. +acme-co$ adb logcat -d | grep DynamicSensorHal +12-15 18:18:45.735 791 791 D DynamicSensorHal: DynamicSensorsSubHal::getSensorsList_2_1 invoked. +12-15 18:18:47.474 791 791 D DynamicSensorHal: DynamicSensorsSubHal::initialize invoked. +acme-co$ adb shell dumpsys sensorservice | grep Dynamic +0000000000) Dynamic Sensor Manager | Google | ver: 1 | type: android.sensor.dynamic_sensor_meta(32) | perm: n/a | flags: 0x00000007 +Dynamic Sensor Manager (handle=0x00000000, connections=1) + Dynamic Sensor Manager 0x00000000 | status: active | pending flush events 0 +acme-co$ adb logcat -c +acme-co$ +``` + +When a dynamic sensor is paired with the device (e.g., Bluetooth rocket buds), +it will appear in the sensor service. + +```shell +acme-co$ adb logcat -d | grep "DynamicSensorHal\|hidraw\|Rocket" +12-15 18:19:55.268 157 157 I hid-generic 0003: 1234:5678.0001: hidraw0: BLUETOOTH HID v0.00 Device [RocketBuds] on +12-15 18:19:55.235 791 809 E DynamicSensorHal: return 1 sensors +12-15 18:19:56.239 1629 1787 I SensorService: Dynamic sensor handle 0x1 connected, type 65536, name RocketBuds +acme-co$ adb shell dumpsys sensorservice | grep Rocket +0x00000001) RocketBuds | BLUETOOTH 1234:1234 | ver: 1 | type: com.google.hardware.sensor.hid_dynamic.headtracker(65536) | perm: n/a | flags: 0x00000020 +acme-co$ +``` + |