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This change takes away control of trackpad from EC entirely. This will prevent EC from interfering with the OS's interaction with the trackpad for firmware update, device detection at boot, or entering S3. Disadvantages are the trackpad will stay on (thus can wake up the system unintentionally) when the system enters S3 in laptop mode then transitions to tablet mode, or vice versa: the trackpad will stay off (thus cannot wake up the system) when the system enters S3 in tablet mode then transitions to laptop mode. However, these corner cases can be handled by waking up the system upon mode transition. The OS can then disable or enable the trackpad depending on the transition direction (laptop <-> tablet) and re-enters S3. Or the OS can leave the system running because mode transition implies a user's intention to start interacting with the device. The keyboard will continue to be managed by EC and disabled or enabled upon mode transition. BUG=chrome-os-partner:61058 BRANCH=reef TEST=Put device into S3 in tablet mode. Wake it up. Change-Id: I2f4aa72d704c6562dd861b105225b1995226a09a Reviewed-on: https://chromium-review.googlesource.com/421275 Commit-Ready: Daisuke Nojiri <dnojiri@chromium.org> Tested-by: Daisuke Nojiri <dnojiri@chromium.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly