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73416ba
(Get the code!)
Created attachment 77561
Patch with driver implementation (suits both 0.5.0 and latest git snapshot)
I've updated the driver, partially switched to asynchronous transfers for device initialization together with some code cleanup.
There's still a short initialization sequence that has to be done before capturing, which is done synchronously.
If I understand correctly, an application using libfprint assumes that the device is ready for capturing the image right after fp_async_
So that if pre-capture initialization is done asynchronously, the user will be asked to deploy his finger right away, before the initalization is completed. And if there is a delay during initialization and the user is quick enough, hse will actually swipe the finger before the device is initialized.
I'm not sure that this is better than UI freeze, that's why I left synchronous transfers there. Some kind of intermediate "now you can swipe your finger" callback could seem a better solution, but that's a lot of work.
In any case, I'm also attaching a patch to make all initialization asynchronous.