How to get sensors.imx8.so to be used by Android 10?

[fadedbee]

I've followed the instructions in the README.md and I now have the following shared object libraries:

 smarc_mx8mq:/ # ls -lA /vendor/lib*/hw/sensors.imx8.so                                                                                         
-rw-r--r-- 1 root root 122684 2021-09-06 14:50 /vendor/lib/hw/sensors.imx8.so
-rw-r--r-- 1 root root 144208 2021-09-06 14:50 /vendor/lib64/hw/sensors.imx8.so

I have added logging to these libraries and can see that they are not being used. (None of the logging is output.)

This is confirmed by:

    smarc_mx8mq:/ # lsof | grep libsensor                                                                                                         
    main       3609       root  mem       REG              179,5     94928       2271 /system/lib64/libsensor.so
    main       3610       root  mem       REG              179,5     71304       1580 /system/lib/libsensor.so
    audioserver  3645 audioserve  mem       REG              179,5     56984       2272 /system/lib64/libsensorprivacy.so
    cameraserver  3655 cameraserv  mem       REG              179,5     40852       1581 /system/lib/libsensorprivacy.so
    system_server  3890     system  mem       REG              179,5     56600       2274 /system/lib64/libsensorservicehidl.so
    ...a dozen more lines...

    smarc_mx8mq:/ # lsof | grep sensors.imx8
    1|smarc_mx8mq:/ #

With adb logcat I see:

09-03 15:45:27.906  3413  3413 I hwservicemanager: getTransport: Cannot find entry android.hardware.sensors@2.0::ISensors/default in either framework or device manifest.
09-03 15:45:27.910  3413  3413 I hwservicemanager: getTransport: Cannot find entry android.hardware.sensors@1.0::ISensors/default in either framework or device manifest.

This makes it look as if I need to add sensors.imx8.so to a manifest, but device/embedian/imx8m/smarc_mx8mq/manifest.xml looks like:

    <manifest version="1.0" type="device" target-level="4">
        <hal format="hidl">
            <name>android.hardware.radio</name>
            <transport>hwbinder</transport>
            <version>1.4</version>
            <interface>
                <name>IRadio</name>
                <instance>slot1</instance>
            </interface>
        </hal>
        <hal format="hidl">
            <name>android.hardware.graphics.allocator</name>
            <transport>hwbinder</transport>
            <impl level="generic"></impl>
            <version>2.0</version>
            <interface>
                <name>IAllocator</name>
                <instance>default</instance>
            </interface>
        </hal>
        ...many more...

The stanzas do not specify library (path) names. I do not see how adding a sensors stanza will help.

How do I make Android use these new shared libraries and see the accelerometer?

[fadedbee]

With the stanza:

    <hal format="hidl">
        <name>android.hardware.sensors</name>
        <transport>hwbinder</transport>
        <version>1.0</version>
        <interface>
            <name>ISensors</name>
            <instance>default</instance>
        </interface>
    </hal>

The errors are now:

    09-03 15:52:50.873  3890  3987 I ServiceManagement: getService: Trying again for android.hardware.sensors@1.0::ISensors/default...
    09-03 15:52:51.873  3890  3987 W ServiceManagement: Waited one second for android.hardware.sensors@1.0::ISensors/default
    09-03 15:52:51.874  3890  3987 I ServiceManagement: getService: Trying again for android.hardware.sensors@1.0::ISensors/default...
    09-03 15:52:52.874  3890  3987 W ServiceManagement: Waited one second for android.hardware.sensors@1.0::ISensors/default
    09-03 15:52:52.876  3890  3987 I ServiceManagement: getService: Trying again for android.hardware.sensors@1.0::ISensors/default...
    09-03 15:52:53.876  3890  3987 W ServiceManagement: Waited one second for android.hardware.sensors@1.0::ISensors/default

I chose version 1.0, after reading https://source.android.com/devices/sensors/hal-interface and https://source.android.com/devices/sensors/sensors-hal2

(The ST Sensors HAL has get_sensors_list() from 1.0 but not getSensorsList() from 2.0.)

[fadedbee]

The problem I had was that the vendor AOSP distribution was not including Sensors at all.

The solution was to add:

    PRODUCT_PACKAGES += android.hardware.sensors@1.0-impl
    PRODUCT_PACKAGES += android.hardware.sensors@1.0-service

to smarc_mx8mq.mk and correct the stanza to:

    <hal format="hidl">
        <name>android.hardware.sensors</name>
        <transport>hwbinder</transport>
        <version>1.0</version>
        <interface>
            <name>ISensors</name>
            <instance>default</instance>
        </interface>
        <fqname>@1.0::ISensors/default</fqname>
    </hal>