I'm running into a similar issue trying to get sensors to work on a
htc_dream build (the Dev phone, "trout") of a recently updated Android
distribution...
It looks like the error is being generated by a path built in 'mydroid/
hardware/libhardware/hardware.c', right here:
mydroid/hardware/libhardware/hardware.c:152 hw_get_module()
snprintf(path, sizeof(path), "%s/%s.%s.so",
HAL_LIBRARY_PATH, id, variant);
... with this defined earlier in the file:
mydroid/hardware/libhardware/hardware.c:33
#define HAL_LIBRARY_PATH "/system/lib/hw"
Running logcat while the phone boots gives these errors:
...
W( 61) load: module=/system/lib/hw/copybit.trout.so error=Cannot
find library (HAL)
...
W( 61) load: module=/system/lib/hw/overlay.trout.so error=Cannot
find library (HAL)
...
W( 61) load: module=/system/lib/hw/sensors.trout.so error=Cannot
find library (HAL)
...
I inserted some debugging lines in a couple of places, then tried to
run an APK which checks for available sensors, which spit this out:
D( 295) hw_get_module: module=sensors (HAL)
D( 295) linker: loading /system/lib/hw/sensors.trout.so ()
W( 295) load: module=/system/lib/hw/sensors.trout.so error=Cannot
find library (HAL)
D( 295) hal_module_info_get: X id=sensors hmi=0x0 status=-22 (HAL)
D( 295) found sensor: null, handle=0 (SensorManager)
So, even though the sensors physically exist, any applications see
NULL: no sensors available.
Looking earlier in the logs, it looks like something is trying to add
sensors using the same missing library:
I( 61) New device: path=/dev/input/event4 name=compass id=0x10000
(of 0x1) index=1 fd=45 classes=0x0 (EventHub)
D( 61) hw_get_module: module=sensors (HAL)
D( 61) linker: loading /system/lib/hw/sensors.trout.so ()
W( 61) load: module=/system/lib/hw/sensors.trout.so error=Cannot
find library (HAL)
D( 61) hal_module_info_get: X id=sensors hmi=0x0 status=-22 (HAL)
D( 61) found sensor: null, handle=0 (SensorManager)
...
The directory '/system/lib/hw' doesn't exist, nor do any "*.trout.so"
files.
Are these libraries supposed to be there? How should they be
generated?
On Feb 3, 5:47 pm, sal de la tierra <[email protected]> wrote:
> I am looking to fill in the sensor_default for the HAL layer. I have
> several different kernel drivers for different sensor devices
> (accelerometer, magnetometer, proximity, etc) and I am trying to get
> them all to register. When I have done the build and try to invoke the
> sensor manager, I get the following messages in the logcat:
>
> E/HAL ( 298): load: module=/system/lib/hw/sensors.default.so
> error=Cannot find library
> D/SensorManager( 298): found sensor: null, handle=0
>
> I am trying to figure out where the /system/lib/hw/sensors.default.so
> comes from and how to include it into my build. Any suggestions would
> be appreciated.
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