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We add 2 hashes that each map to a list of allowed commands (command list is secret, and provided by Elan). UPDATE_EXTRA_CMD_TOUCHPAD_DEBUG on the USB interface have the following format for the parameter: - param[0]: must be 0xff - param[1]: offset of the I2C command in data - param[2]: command length - param[3-4]: read-back length (MSB first) over I2C, can be 0 - param[5-49]: data, is verified using SHA-256 hash. The I2C command pointed at by param[1-2] is then sent over I2C, and the data is read back into a shared buffer of size param[3-4]. The data can be fetched over USB by a single byte USB update touchpad debug command (indicating an offset in 64-bytes unit), fetching data from the shared buffer in blocks of 64 bytes. BRANCH=none BUG=b:63993891 TEST=Elan can run debugging commands using their proprietary tool. Change-Id: Idb19bcb940b7f030c3b3aeaf39d6b725fcb9ef34 Signed-off-by: Nicolas Boichat <drinkcat@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/763576 Reviewed-by: Chun-ta Lin <itspeter@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