WIP: Kindle Scribe hardware rotation

[mergen3107]

Trying to re-implement fixes discussed in #11269 (comment)

Work in Progress. I mainly created this PR to be able to quickly show and ask about steps I tried.

Maybe this PR will become a good one in future?

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This change is 

[mergen3107]

Didn't achieve much progress today. To be continued :D

[mergen3107]

I played around yesterday with Kindle Scribe Init and KindleTouch:Exit(), but I found out that Generic Device Init is in the way.

My goal with these optimization is to force Kindle SW and HW rotation to canonical upright Portrait ("0" in SW, "3" in HW) upon every cold start. This will make sure that the swipe directions are setup correctly each time.

However, Generic Device Exit saved the last rotation upon exit or restart which Generic Device Init then restore to upon fresh start or restart.

1. Is there a way to let Generic Device Init know that this is a restart and not a fresh start? This has worked great to pass through between Generic Device Exit and KindleTouch Exit, but I couldn't make it work between Generic Exit and Generic Init.

2. If so, may I guard that code with "if restart" so that it doesn't restore rotation if it's a fresh start?

If the answer is no and you guys wouldn't like to change Device Init (because it is common for all devices), then that's probably OK. I am happy as long as my end result doesn't have touch and UI rotations misaligned.

Thanks!

[mergen3107]

(Commits aren't up to date with my experiments yet, so please don't review yet)

[mergen3107]

Same as here:
#11265 (comment)

[Frenzie]

Any relation to koreader/koreader-base#1719?

[mergen3107]

@Frenzie
Sort of :D I close that one too, because I got a Kindle Scribe case that enforces U orientation.