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authorDaniel Kurtz <djkurtz@chromium.org>2011-08-24 10:02:31 +0400
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2011-08-24 10:08:16 +0400
commita6ca40c11eb5d98e53176adf527e430f7037a8c9 (patch)
tree74d08548873d3b6a9d58c8f0728025881d818b58 /Documentation/input
parent3cdfee9ea7e98eb6e8c3d4d66f2dfcfffe6afc4d (diff)
downloadlinux-a6ca40c11eb5d98e53176adf527e430f7037a8c9.tar.xz
Input: synaptics - decode AGM packet types
A Synaptics image sensor tracks 5 fingers, but can only report 2. The algorithm for choosing which 2 fingers to report and in which packet: Touchpad maintains 5 slots, numbered 0 to 4 Initially all slots are empty As new fingers are detected, assign them to the lowest available slots The touchpad always reports: SGM: lowest numbered non-empty slot AGM: highest numbered non-empty slot, if there is one In addition, these touchpads have a special AGM packet type which reports the number of fingers currently being tracked, and which finger is in each of the two slots. Unfortunately, these "TYPE=2" packets are only used when more than 3 fingers are being tracked. When less than 4 fingers are present, the 'w' value must be used to track how many fingers are present, and knowing which fingers are being reported is much more difficult, if not impossible. Signed-off-by: Daniel Kurtz <djkurtz@chromium.org> Acked-by: Chase Douglas <chase.douglas@canonical.com> Acked-by: Henrik Rydberg <rydberg@euromail.se> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
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