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Detachable devices need firmware help to process battery disconnect requests promptly. The request happens when the user keeps pressed both power and "volume up" buttons and yanks the charger cable. Once this condition is detected a 5 s timeout is started, and if the charger cable is not plugged back in during this interval, the code initiates a low polarity pulse on both EC_RST_L and BAT_EN outputs. Lowering BAT_EN level will cause the battery cut off which is supposed to cause an immediate system power down. BRANCH=none BUG=chrome-os-partner:59833 TEST=verified desired behavior on an H1 dev board with a H1B2-D chip. Change-Id: Iecdcc93e228f4bc18734569bd896b0afa4bb752a Signed-off-by: Vadim Bendebury <vbendeb@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/426345 Reviewed-by: Marius Schilder <mschilder@chromium.org>