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Cypress APA trackpad with I2C interface driver.

October 03, 2016
CYAPA(4) BSD Kernel Interfaces 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 configura‐ tion 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" In /boot/device.hints:"iicbus0" hint.cyapa.0.addr="0xCE""iicbus1" hint.cyapa.1.addr="0xCE"


The cyapa driver provides support for the Cypress APA trackpad. It emulates the Intel‐ liMouse PS/2 protocol. It supports basic mouse ioctls, so that moused(8) is supported prop‐ erly. Trackpad layout 2/3 1/3 +--------------------+------------+ | | Middle | | | Button | | Left | | | Button +------------+ | | Right | | | Button | +--------------------+............| | Thumb/Button Area | 15% +---------------------------------+ Trackpad features 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 fin‐ ger 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: 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 sup‐ ports 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


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 <>. This manual page was written by Michael Gmelin <>.


The cyapa driver detects the device from the I2C address. This might have unforeseen conse‐ quences if the initialization sequence is sent to an unknown device at that address.
BSD October 03, 2016 BSD
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cyapa(4freebsd) referred by chromebook_platform(4freebsd)
refer to ig4(4freebsd) | iicbus(4freebsd) | sysctl(8) | sysctl.conf(5) | sysmouse(4freebsd)
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