Input: synaptics - use firmware data for Cr-48
The profile sensor clickpad in a Cr-48 Chromebook does a reasonable job of tracking individual fingers. This tracking isn't perfect, but, experiments show that it works better than just passing "semi-mt" data to userspace, and making userspace try to deduce where the fingers are given a bounding box. This patch tries to report correct two-finger positions instead of the {(min_x, min_y), (max_x, max_y)} for profile sensor clickpads on Cr-48 chromebooks. Note that this device's firmware always reports the higher (smaller y) finger in the "sgm" packet, and the lower (larger y) finger in the "agm" packet. Thus, when a new finger arrives on the pad, the kernel driver uses input core's contact tracking facilities to match contacts with slots. Inspired by patch by Daniel Kurtz <djkurtz@chromium.org> and Chung-yih Wang <cywang@chromium.org> Signed-off-by: NHenrik Rydberg <rydberg@euromail.se> Reviewed-by: NBenson Leung <bleung@chromium.org> Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>
Showing
想要评论请 注册 或 登录