[Bug 205690] [psm] [patch]: Add support for Elantech trackpads

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205690

--- Comment #59 from Guilherme Salazar <gmesalazar at gmail.com> ---
(In reply to Vladimir Kondratyev from comment #58)

PSM-related parts of dmesg and "sysctl hw.psm below; the gesture data I posted
at http://pastebin.com/2WDATpGp. Please let me know if you need me to do it
again.

$ dmesg
...
Elantech touchpad hardware v.3 firmware v.0x450f02
psm: SEND_AUX_DEV_STATUS return code:00fa
psm: status 79 17 0c
psm: SET_SCALING11 return code:00fa
psm: SEND_AUX_DEV_STATUS return code:00fa
psm: status 0b 01 14
psm: SEND_AUX_DEV_STATUS return code:00fa
psm: status 5b 7c 78
  Model information:
   MaxX:     2940
   MaxY:     1400
   DpmmX:    32
   DpmmY:    32
   TracesX:  22
   TracesY:  11
   SemiMT:   0
   Clickpad: 0
   Trackpad: 0
   CRC:      0
   Pressure: 1
elantech: END init
psm0: found Elantech Touchpad
...

$ sysctl hw.psm.
hw.psm.elantech.touchpad_off: 0
hw.psm.elantech.vscroll_div_max: 50
hw.psm.elantech.vscroll_div_min: 30
hw.psm.elantech.vscroll_min_delta: 15
hw.psm.elantech.vscroll_ver_area: 0
hw.psm.elantech.vscroll_hor_area: 0
hw.psm.elantech.taphold_timeout: 125000
hw.psm.elantech.tap_min_queue: 2
hw.psm.elantech.tap_max_delta: 25
hw.psm.elantech.div_len: 30
hw.psm.elantech.div_max_na: 10
hw.psm.elantech.div_max: 6
hw.psm.elantech.div_min: 3
hw.psm.elantech.weight_len_squared: 200
hw.psm.elantech.weight_previous_na: 20
hw.psm.elantech.weight_previous: 6
hw.psm.elantech.weight_current: 3
hw.psm.elantech.multiplicator: 10000
hw.psm.elantech.window_max: 10
hw.psm.elantech.window_min: 4
hw.psm.elantech.na_left: 0
hw.psm.elantech.na_bottom: 0
hw.psm.elantech.na_right: 0
hw.psm.elantech.na_top: 0
hw.psm.elantech.margin_left: 0
hw.psm.elantech.margin_bottom: 0
hw.psm.elantech.margin_right: 0
hw.psm.elantech.margin_top: 0
hw.psm.elantech.max_width: 10
hw.psm.elantech.max_pressure: 220
hw.psm.elantech.min_pressure: 1
hw.psm.elantech.two_finger_scroll: 1
hw.psm.elantech.max_y: 1400
hw.psm.elantech.max_x: 2940
hw.psm.elantech.directional_scrolls: 0
hw.psm.tap_timeout: 125000
hw.psm.tap_threshold: 25
hw.psm.tap_enabled: -1

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