forked from luck/tmp_suning_uos_patched
e938fbfd4a
In older versions of the elantech hardware/firmware those bits always were unset, so it didn't actually matter, but newer versions seem to use those high bits for something else, screwing up the coordinates we report to the input layer for those devices. Signed-off-by: Florian Ragwitz <rafl@debian.org> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
406 lines
10 KiB
Plaintext
406 lines
10 KiB
Plaintext
Elantech Touchpad Driver
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========================
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Copyright (C) 2007-2008 Arjan Opmeer <arjan@opmeer.net>
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Extra information for hardware version 1 found and
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provided by Steve Havelka
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Version 2 (EeePC) hardware support based on patches
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received from Woody at Xandros and forwarded to me
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by user StewieGriffin at the eeeuser.com forum
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Contents
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~~~~~~~~
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1. Introduction
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2. Extra knobs
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3. Hardware version 1
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3.1 Registers
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3.2 Native relative mode 4 byte packet format
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3.3 Native absolute mode 4 byte packet format
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4. Hardware version 2
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4.1 Registers
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4.2 Native absolute mode 6 byte packet format
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4.2.1 One finger touch
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4.2.2 Two finger touch
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1. Introduction
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~~~~~~~~~~~~
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Currently the Linux Elantech touchpad driver is aware of two different
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hardware versions unimaginatively called version 1 and version 2. Version 1
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is found in "older" laptops and uses 4 bytes per packet. Version 2 seems to
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be introduced with the EeePC and uses 6 bytes per packet.
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The driver tries to support both hardware versions and should be compatible
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with the Xorg Synaptics touchpad driver and its graphical configuration
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utilities.
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Additionally the operation of the touchpad can be altered by adjusting the
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contents of some of its internal registers. These registers are represented
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by the driver as sysfs entries under /sys/bus/serio/drivers/psmouse/serio?
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that can be read from and written to.
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Currently only the registers for hardware version 1 are somewhat understood.
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Hardware version 2 seems to use some of the same registers but it is not
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known whether the bits in the registers represent the same thing or might
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have changed their meaning.
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On top of that, some register settings have effect only when the touchpad is
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in relative mode and not in absolute mode. As the Linux Elantech touchpad
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driver always puts the hardware into absolute mode not all information
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mentioned below can be used immediately. But because there is no freely
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available Elantech documentation the information is provided here anyway for
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completeness sake.
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/////////////////////////////////////////////////////////////////////////////
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2. Extra knobs
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~~~~~~~~~~~
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Currently the Linux Elantech touchpad driver provides two extra knobs under
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/sys/bus/serio/drivers/psmouse/serio? for the user.
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* debug
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Turn different levels of debugging ON or OFF.
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By echoing "0" to this file all debugging will be turned OFF.
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Currently a value of "1" will turn on some basic debugging and a value of
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"2" will turn on packet debugging. For hardware version 1 the default is
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OFF. For version 2 the default is "1".
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Turning packet debugging on will make the driver dump every packet
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received to the syslog before processing it. Be warned that this can
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generate quite a lot of data!
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* paritycheck
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Turns parity checking ON or OFF.
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By echoing "0" to this file parity checking will be turned OFF. Any
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non-zero value will turn it ON. For hardware version 1 the default is ON.
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For version 2 the default it is OFF.
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Hardware version 1 provides basic data integrity verification by
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calculating a parity bit for the last 3 bytes of each packet. The driver
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can check these bits and reject any packet that appears corrupted. Using
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this knob you can bypass that check.
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It is not known yet whether hardware version 2 provides the same parity
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bits. Hence checking is disabled by default. Currently even turning it on
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will do nothing.
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/////////////////////////////////////////////////////////////////////////////
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3. Hardware version 1
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==================
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3.1 Registers
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~~~~~~~~~
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By echoing a hexadecimal value to a register it contents can be altered.
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For example:
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echo -n 0x16 > reg_10
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* reg_10
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bit 7 6 5 4 3 2 1 0
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B C T D L A S E
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E: 1 = enable smart edges unconditionally
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S: 1 = enable smart edges only when dragging
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A: 1 = absolute mode (needs 4 byte packets, see reg_11)
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L: 1 = enable drag lock (see reg_22)
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D: 1 = disable dynamic resolution
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T: 1 = disable tapping
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C: 1 = enable corner tap
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B: 1 = swap left and right button
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* reg_11
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bit 7 6 5 4 3 2 1 0
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1 0 0 H V 1 F P
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P: 1 = enable parity checking for relative mode
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F: 1 = enable native 4 byte packet mode
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V: 1 = enable vertical scroll area
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H: 1 = enable horizontal scroll area
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* reg_20
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single finger width?
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* reg_21
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scroll area width (small: 0x40 ... wide: 0xff)
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* reg_22
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drag lock time out (short: 0x14 ... long: 0xfe;
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0xff = tap again to release)
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* reg_23
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tap make timeout?
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* reg_24
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tap release timeout?
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* reg_25
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smart edge cursor speed (0x02 = slow, 0x03 = medium, 0x04 = fast)
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* reg_26
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smart edge activation area width?
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3.2 Native relative mode 4 byte packet format
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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byte 0:
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bit 7 6 5 4 3 2 1 0
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c c p2 p1 1 M R L
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L, R, M = 1 when Left, Right, Middle mouse button pressed
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some models have M as byte 3 odd parity bit
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when parity checking is enabled (reg_11, P = 1):
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p1..p2 = byte 1 and 2 odd parity bit
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c = 1 when corner tap detected
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byte 1:
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bit 7 6 5 4 3 2 1 0
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dx7 dx6 dx5 dx4 dx3 dx2 dx1 dx0
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dx7..dx0 = x movement; positive = right, negative = left
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byte 1 = 0xf0 when corner tap detected
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byte 2:
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bit 7 6 5 4 3 2 1 0
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dy7 dy6 dy5 dy4 dy3 dy2 dy1 dy0
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dy7..dy0 = y movement; positive = up, negative = down
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byte 3:
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parity checking enabled (reg_11, P = 1):
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bit 7 6 5 4 3 2 1 0
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w h n1 n0 ds3 ds2 ds1 ds0
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normally:
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ds3..ds0 = scroll wheel amount and direction
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positive = down or left
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negative = up or right
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when corner tap detected:
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ds0 = 1 when top right corner tapped
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ds1 = 1 when bottom right corner tapped
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ds2 = 1 when bottom left corner tapped
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ds3 = 1 when top left corner tapped
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n1..n0 = number of fingers on touchpad
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only models with firmware 2.x report this, models with
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firmware 1.x seem to map one, two and three finger taps
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directly to L, M and R mouse buttons
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h = 1 when horizontal scroll action
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w = 1 when wide finger touch?
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otherwise (reg_11, P = 0):
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bit 7 6 5 4 3 2 1 0
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ds7 ds6 ds5 ds4 ds3 ds2 ds1 ds0
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ds7..ds0 = vertical scroll amount and direction
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negative = up
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positive = down
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3.3 Native absolute mode 4 byte packet format
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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byte 0:
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firmware version 1.x:
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bit 7 6 5 4 3 2 1 0
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D U p1 p2 1 p3 R L
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L, R = 1 when Left, Right mouse button pressed
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p1..p3 = byte 1..3 odd parity bit
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D, U = 1 when rocker switch pressed Up, Down
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firmware version 2.x:
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bit 7 6 5 4 3 2 1 0
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n1 n0 p2 p1 1 p3 R L
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L, R = 1 when Left, Right mouse button pressed
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p1..p3 = byte 1..3 odd parity bit
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n1..n0 = number of fingers on touchpad
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byte 1:
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firmware version 1.x:
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bit 7 6 5 4 3 2 1 0
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f 0 th tw x9 x8 y9 y8
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tw = 1 when two finger touch
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th = 1 when three finger touch
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f = 1 when finger touch
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firmware version 2.x:
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bit 7 6 5 4 3 2 1 0
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. . . . x9 x8 y9 y8
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byte 2:
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bit 7 6 5 4 3 2 1 0
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x7 x6 x5 x4 x3 x2 x1 x0
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x9..x0 = absolute x value (horizontal)
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byte 3:
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bit 7 6 5 4 3 2 1 0
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y7 y6 y5 y4 y3 y2 y1 y0
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y9..y0 = absolute y value (vertical)
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/////////////////////////////////////////////////////////////////////////////
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4. Hardware version 2
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==================
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4.1 Registers
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~~~~~~~~~
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By echoing a hexadecimal value to a register it contents can be altered.
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For example:
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echo -n 0x56 > reg_10
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* reg_10
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bit 7 6 5 4 3 2 1 0
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0 1 0 1 0 1 D 0
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D: 1 = enable drag and drop
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* reg_11
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bit 7 6 5 4 3 2 1 0
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1 0 0 0 S 0 1 0
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S: 1 = enable vertical scroll
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* reg_21
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unknown (0x00)
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* reg_22
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drag and drop release time out (short: 0x70 ... long 0x7e;
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0x7f = never i.e. tap again to release)
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4.2 Native absolute mode 6 byte packet format
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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4.2.1 One finger touch
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~~~~~~~~~~~~~~~~
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byte 0:
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bit 7 6 5 4 3 2 1 0
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n1 n0 . . . . R L
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L, R = 1 when Left, Right mouse button pressed
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n1..n0 = numbers of fingers on touchpad
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byte 1:
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bit 7 6 5 4 3 2 1 0
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. . . . . x10 x9 x8
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byte 2:
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bit 7 6 5 4 3 2 1 0
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x7 x6 x5 x4 x4 x2 x1 x0
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x10..x0 = absolute x value (horizontal)
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byte 3:
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bit 7 6 5 4 3 2 1 0
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. . . . . . . .
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byte 4:
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bit 7 6 5 4 3 2 1 0
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. . . . . . y9 y8
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byte 5:
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bit 7 6 5 4 3 2 1 0
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y7 y6 y5 y4 y3 y2 y1 y0
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y9..y0 = absolute y value (vertical)
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4.2.2 Two finger touch
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~~~~~~~~~~~~~~~~
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byte 0:
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bit 7 6 5 4 3 2 1 0
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n1 n0 ay8 ax8 . . R L
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L, R = 1 when Left, Right mouse button pressed
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n1..n0 = numbers of fingers on touchpad
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byte 1:
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bit 7 6 5 4 3 2 1 0
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ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
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ax8..ax0 = first finger absolute x value
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byte 2:
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bit 7 6 5 4 3 2 1 0
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ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0
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ay8..ay0 = first finger absolute y value
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byte 3:
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bit 7 6 5 4 3 2 1 0
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. . by8 bx8 . . . .
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byte 4:
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bit 7 6 5 4 3 2 1 0
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bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0
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bx8..bx0 = second finger absolute x value
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byte 5:
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bit 7 6 5 4 3 2 1 0
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by7 by8 by5 by4 by3 by2 by1 by0
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by8..by0 = second finger absolute y value
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