I was browsing for AOSP
bluetooth code to know more about HIDL
.
As per my understanding, HIDL
provides an interface between System services
and HAL layer
.
But as per official android doc here , It seems that HIDL
is interface between bluetooth stack(/system/bt)
and bluetooth firmware implementation.
Shouldn't HIDL
be present between Bluetooth process services and bluetooth stack?
Am I missing something here?
The question you have to ask is which parts of the whole Bluetooth stack can be provided by Android and which parts have to be provided by the hardware/device manufacturer.
Google probably decided that all they need from a hardware/device manufacturer is what is described in the Bluetooth HIDL interfaces and that they provide the rest of the stack in the Android framework.