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If a key is down prior to the time of initialization, we would not get the
down event for the key, and thus think that the key is not pressed.

Add an interface that allows one to provide a callback to execute
on all keys that are currently down.

Change-Id: I2a4096c0cb4c7c7a9a80d207835f168a0b418413
Signed-off-by: Dima Zavin <dima@android.com>

Change-Id: Iad52a6f2adcae0068d252d6163586f9d7b93121d
Signed-off-by: Dima Zavin <dima@android.com>

Events are now delivered through a callback mechanism during
a call to ev_dispatch(). This will allow us to extend the events
code to handle other devices/fds, not just input. One such example
is the ability to process uevents.

During initialization, we provide an input callback to ev_init
that gets called when a new event is encountered during dispatch.

ev_get has been removed and replaced with ev_get_input() helper
function that can be called from inside the callback to attempt
to get an input event.

The existing client of ev_get in recovery has been split up such
that the input thread just calls ev_wait(); ev_dispatch(); and
the input_callback handles individual events by using the
ev_get_input() helper.

Change-Id: I24d8e71bd1533876b4ab1ae751ba200fea43c049
Signed-off-by: Dima Zavin <dima@android.com>

Change-Id: I5c3ee61cbf6fadae50f10b9f2e73caceaa5048a7
Signed-off-by: Dima Zavin <dima@android.com>

Change-Id: I5e8f477b7b205794f2975f12e6b6010c177f6052
Signed-off-by: Dima Zavin <dima@android.com>

Take some device-specific details of the recovery UI (eg, what keys to
press to bring up the interface and perform actions, exact text of the
menu, etc.) and split them out into separate C functions.  Arrange to
take implementations of those functions from the appropriate vendor
directory at build time.  Provide a default implementation in case no
vendor-specific one is available.