CYAPA(4) Device Drivers Manual CYAPA(4)

cyapa — Cypress APA trackpad with I2C interface driver

To compile this driver into the kernel, place the following lines into the kernel configuration file:

device cyapa
device ig4
device iicbus

Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

cyapa_load="YES"
ig4_load="YES"

On many Chromebook models this driver can be automatically configured with the help of the chromebook_platform(4) driver. Alternatively, the


cyapa driver can be manually configured in /boot/device.hints:
hint.cyapa.0.at="iicbus0"
hint.cyapa.0.addr="0xCE"
hint.cyapa.1.at="iicbus1"
hint.cyapa.1.addr="0xCE"

The cyapa driver provides support for the Cypress APA trackpad. It emulates the IntelliMouse PS/2 protocol. It supports basic mouse ioctls, so that moused(8) is supported properly.

                   2/3               1/3
          +--------------------+------------+
          |                    |   Middle   |
          |                    |   Button   |
          |       Left         |            |
          |      Button        +------------+
          |                    |   Right    |
          |                    |   Button   |
          +--------------------+............|
          |     Thumb/Button Area           | 15%
          +---------------------------------+

Two finger scrolling
Use two fingers for Z axis scrolling.
Button down/second finger
While one finger clicks and holds down the touchpad, the second finger can be used to move the mouse cursor. This can be useful for drawing or selecting text.
Thumb/Button area
The lower 15% of the trackpad will not affect the mouse cursor position. This allows for high precision clicking, by controlling the cursor with the index finger and pushing/holding the pad down with the thumb.
Trackpad button
Push physical button. The left two thirds of the pad issues a LEFT button event. The upper right corner issues a MIDDLE button event. The lower right corner issues a RIGHT button. Optionally, tap to click can be enabled (see below).

On a system using device.hints(5), these values are configurable for cyapa:

hint.cyapa.%d.at
target iicbus(4).
hint.cyapa.%d.addr
cyapa i2c address on the iicbus(4).

These sysctl(8) variables are available:

debug.cyapa_idle_freq
Scan frequency in idle mode, the default is 1.
debug.cyapa_slow_freq
Scan frequency in slow mode, the default is 20.
debug.cyapa_norm_freq
Scan frequency in normal mode, the default is 100.
debug.cyapa_minpressure
Minimum pressure to detect a finger, the default is 12.
debug.cyapa_enable_tapclick
Controls tap to click. Possible values:
0
Tap to click is disabled. This is the default value.
1
Tap to click always generates a left mouse button event.
2
Tap to click generates left mouse button event if the left 2/3rds of the pad are tapped and a right mouse button event otherwise.
3
Tap to click generates mouse button events as if the physical button was pressed (see DESCRIPTION above).
debug.cyapa_tapclick_min_ticks
Minimum tap duration in ticks to create a click, the default is 1.
debug.cyapa_tapclick_max_ticks
Maximum tap duration in ticks to create a click, the default is 8.
debug.cyapa_move_min_ticks
Minimum ticks before cursor movement occurs, the default is 4.
debug.cyapa_scroll_wait_ticks
Ticks to wait before starting to scroll, the default is 0.
debug.cyapa_scroll_stick_ticks
Ticks while preventing cursor movement on single finger after scroll, the default is 15.
debug.cyapa_thumbarea_percent
Size of bottom thumb area in percent, the default is 15.
debug.cyapa_debug
Setting this to a non-zero value enables debug output to console and syslog, the default is 0.
debug.cyapa_reset
Setting this to a non-zero value reinitializes the device. The sysctl resets to zero immediately.

cyapa creates /dev/cyapa0, which presents the mouse as an IntelliMouse PS/2 device. It supports moused(8) levels 0 through 2, level 1 is used by default.

To use cyapa with moused(8), add the following lines to the rc.conf(5) file:

moused_enable="YES"
moused_port="/dev/cyapa0"

If vertical scrolling is not desired, add

moused_flags="-l0"

to rc.conf(5).

Enable tap to click for the left and the right mouse button and disable the thumb area by adding these lines to the sysctl.conf(5) file:

debug.cyapa_thumbarea_percent=0
debug.cyapa_enable_tapclick=2

chromebook_platform(4), ig4(4), iicbus(4), sysmouse(4), moused(8)

The original cyapa driver was written for DragonFly BSD by Matthew Dillon.

It has been ported, modified, and enhanced for FreeBSD by Michael Gmelin <freebsd@grem.de>.

This manual page was written by Michael Gmelin <freebsd@grem.de>.

The cyapa driver detects the device from the I2C address. This might have unforeseen consequences if the initialization sequence is sent to an unknown device at that address.

December 18, 2018 Debian