Randall Spangler a6060f53ee cr50: Add physical presence state machine ...

This will be used as part of case closed debugging configuration.
Currently, this only adds the state machine, and a test command which
is available when CR50_DEV=1.  It also adds a new sleep mask flag for
physical presence detect, instead of oveloading FORCE_NO_DSLEEP.

The physical presence state machine supports both short (tap 5 times
in 15 seconds) and long (short, followed by 4 more taps 1-5 minutes
apart) sequences.  It will call a callback function at the end of the
sequence, so that multiple things can each request physical presence
in turn.  This will be used by ccdopen / ccdunlock / testlab commands
for CCD V1.

Eventually, CCD config will replace the unlock sequence handling in
wp.c.  But for now, we don't touch that.

See go/cr50-ccd-wp for more information.

BUG=b:62537474
BRANCH=none
TEST=manual
	Short sequence:
		pp short
		pp
		pp
		pp # See "Physical presence good"
	Timeout
		pp short
		pp # 15 sec later, get timeout error
	Long sequence:
		pp long
		pp
		pp
		pp
		(wait 2 sec)
		pp
		(wait 2 sec)
		pp # See "PP good"
	Long sequence, presses too fast:
		pp long
		pp
		pp
		pp
		pp # See "PP L too soon"
		(wait 2 sec)
		pp
		(wait 2 sec)
		pp # See "Physical presence good"
	Abort:
		pp short
		pp abort # See "Physical presence aborted"

Change-Id: I09da81ad11d328e7d7740c3fe838a5f67d7b8708
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/568796
Reviewed-by: Aseda Aboagye <aaboagye@chromium.org>
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-by: Mary Ruthven <mruthven@chromium.org>

2017-07-19 14:41:21 -07:00

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