mirror of
https://github.com/torvalds/linux.git
synced 2024-11-11 06:31:49 +00:00
2a0bd75e5e
This is version 5 of the driver. Relative mode support has been dropped (users wishing to use touchpad in relative mode can use standard PS/2 protocol emulation done in hardware). The driver supports both original version of Elantech protocol and the newer one used by touchpads installed in EeePC. Signed-off-by: Arjan Opmeer <arjan@opmeer.net> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
406 lines
10 KiB
Plaintext
406 lines
10 KiB
Plaintext
Elantech Touchpad Driver
|
|
========================
|
|
|
|
Copyright (C) 2007-2008 Arjan Opmeer <arjan@opmeer.net>
|
|
|
|
Extra information for hardware version 1 found and
|
|
provided by Steve Havelka
|
|
|
|
Version 2 (EeePC) hardware support based on patches
|
|
received from Woody at Xandros and forwarded to me
|
|
by user StewieGriffin at the eeeuser.com forum
|
|
|
|
|
|
Contents
|
|
~~~~~~~~
|
|
|
|
1. Introduction
|
|
2. Extra knobs
|
|
3. Hardware version 1
|
|
3.1 Registers
|
|
3.2 Native relative mode 4 byte packet format
|
|
3.3 Native absolute mode 4 byte packet format
|
|
4. Hardware version 2
|
|
4.1 Registers
|
|
4.2 Native absolute mode 6 byte packet format
|
|
4.2.1 One finger touch
|
|
4.2.2 Two finger touch
|
|
|
|
|
|
|
|
1. Introduction
|
|
~~~~~~~~~~~~
|
|
|
|
Currently the Linux Elantech touchpad driver is aware of two different
|
|
hardware versions unimaginatively called version 1 and version 2. Version 1
|
|
is found in "older" laptops and uses 4 bytes per packet. Version 2 seems to
|
|
be introduced with the EeePC and uses 6 bytes per packet.
|
|
|
|
The driver tries to support both hardware versions and should be compatible
|
|
with the Xorg Synaptics touchpad driver and its graphical configuration
|
|
utilities.
|
|
|
|
Additionally the operation of the touchpad can be altered by adjusting the
|
|
contents of some of its internal registers. These registers are represented
|
|
by the driver as sysfs entries under /sys/bus/serio/drivers/psmouse/serio?
|
|
that can be read from and written to.
|
|
|
|
Currently only the registers for hardware version 1 are somewhat understood.
|
|
Hardware version 2 seems to use some of the same registers but it is not
|
|
known whether the bits in the registers represent the same thing or might
|
|
have changed their meaning.
|
|
|
|
On top of that, some register settings have effect only when the touchpad is
|
|
in relative mode and not in absolute mode. As the Linux Elantech touchpad
|
|
driver always puts the hardware into absolute mode not all information
|
|
mentioned below can be used immediately. But because there is no freely
|
|
available Elantech documentation the information is provided here anyway for
|
|
completeness sake.
|
|
|
|
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
2. Extra knobs
|
|
~~~~~~~~~~~
|
|
|
|
Currently the Linux Elantech touchpad driver provides two extra knobs under
|
|
/sys/bus/serio/drivers/psmouse/serio? for the user.
|
|
|
|
* debug
|
|
|
|
Turn different levels of debugging ON or OFF.
|
|
|
|
By echoing "0" to this file all debugging will be turned OFF.
|
|
|
|
Currently a value of "1" will turn on some basic debugging and a value of
|
|
"2" will turn on packet debugging. For hardware version 1 the default is
|
|
OFF. For version 2 the default is "1".
|
|
|
|
Turning packet debugging on will make the driver dump every packet
|
|
received to the syslog before processing it. Be warned that this can
|
|
generate quite a lot of data!
|
|
|
|
* paritycheck
|
|
|
|
Turns parity checking ON or OFF.
|
|
|
|
By echoing "0" to this file parity checking will be turned OFF. Any
|
|
non-zero value will turn it ON. For hardware version 1 the default is ON.
|
|
For version 2 the default it is OFF.
|
|
|
|
Hardware version 1 provides basic data integrity verification by
|
|
calculating a parity bit for the last 3 bytes of each packet. The driver
|
|
can check these bits and reject any packet that appears corrupted. Using
|
|
this knob you can bypass that check.
|
|
|
|
It is not known yet whether hardware version 2 provides the same parity
|
|
bits. Hence checking is disabled by default. Currently even turning it on
|
|
will do nothing.
|
|
|
|
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
3. Hardware version 1
|
|
==================
|
|
|
|
3.1 Registers
|
|
~~~~~~~~~
|
|
|
|
By echoing a hexadecimal value to a register it contents can be altered.
|
|
|
|
For example:
|
|
|
|
echo -n 0x16 > reg_10
|
|
|
|
* reg_10
|
|
|
|
bit 7 6 5 4 3 2 1 0
|
|
B C T D L A S E
|
|
|
|
E: 1 = enable smart edges unconditionally
|
|
S: 1 = enable smart edges only when dragging
|
|
A: 1 = absolute mode (needs 4 byte packets, see reg_11)
|
|
L: 1 = enable drag lock (see reg_22)
|
|
D: 1 = disable dynamic resolution
|
|
T: 1 = disable tapping
|
|
C: 1 = enable corner tap
|
|
B: 1 = swap left and right button
|
|
|
|
* reg_11
|
|
|
|
bit 7 6 5 4 3 2 1 0
|
|
1 0 0 H V 1 F P
|
|
|
|
P: 1 = enable parity checking for relative mode
|
|
F: 1 = enable native 4 byte packet mode
|
|
V: 1 = enable vertical scroll area
|
|
H: 1 = enable horizontal scroll area
|
|
|
|
* reg_20
|
|
|
|
single finger width?
|
|
|
|
* reg_21
|
|
|
|
scroll area width (small: 0x40 ... wide: 0xff)
|
|
|
|
* reg_22
|
|
|
|
drag lock time out (short: 0x14 ... long: 0xfe;
|
|
0xff = tap again to release)
|
|
|
|
* reg_23
|
|
|
|
tap make timeout?
|
|
|
|
* reg_24
|
|
|
|
tap release timeout?
|
|
|
|
* reg_25
|
|
|
|
smart edge cursor speed (0x02 = slow, 0x03 = medium, 0x04 = fast)
|
|
|
|
* reg_26
|
|
|
|
smart edge activation area width?
|
|
|
|
|
|
3.2 Native relative mode 4 byte packet format
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
byte 0:
|
|
bit 7 6 5 4 3 2 1 0
|
|
c c p2 p1 1 M R L
|
|
|
|
L, R, M = 1 when Left, Right, Middle mouse button pressed
|
|
some models have M as byte 3 odd parity bit
|
|
when parity checking is enabled (reg_11, P = 1):
|
|
p1..p2 = byte 1 and 2 odd parity bit
|
|
c = 1 when corner tap detected
|
|
|
|
byte 1:
|
|
bit 7 6 5 4 3 2 1 0
|
|
dx7 dx6 dx5 dx4 dx3 dx2 dx1 dx0
|
|
|
|
dx7..dx0 = x movement; positive = right, negative = left
|
|
byte 1 = 0xf0 when corner tap detected
|
|
|
|
byte 2:
|
|
bit 7 6 5 4 3 2 1 0
|
|
dy7 dy6 dy5 dy4 dy3 dy2 dy1 dy0
|
|
|
|
dy7..dy0 = y movement; positive = up, negative = down
|
|
|
|
byte 3:
|
|
parity checking enabled (reg_11, P = 1):
|
|
|
|
bit 7 6 5 4 3 2 1 0
|
|
w h n1 n0 ds3 ds2 ds1 ds0
|
|
|
|
normally:
|
|
ds3..ds0 = scroll wheel amount and direction
|
|
positive = down or left
|
|
negative = up or right
|
|
when corner tap detected:
|
|
ds0 = 1 when top right corner tapped
|
|
ds1 = 1 when bottom right corner tapped
|
|
ds2 = 1 when bottom left corner tapped
|
|
ds3 = 1 when top left corner tapped
|
|
n1..n0 = number of fingers on touchpad
|
|
only models with firmware 2.x report this, models with
|
|
firmware 1.x seem to map one, two and three finger taps
|
|
directly to L, M and R mouse buttons
|
|
h = 1 when horizontal scroll action
|
|
w = 1 when wide finger touch?
|
|
|
|
otherwise (reg_11, P = 0):
|
|
|
|
bit 7 6 5 4 3 2 1 0
|
|
ds7 ds6 ds5 ds4 ds3 ds2 ds1 ds0
|
|
|
|
ds7..ds0 = vertical scroll amount and direction
|
|
negative = up
|
|
positive = down
|
|
|
|
|
|
3.3 Native absolute mode 4 byte packet format
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
byte 0:
|
|
firmware version 1.x:
|
|
|
|
bit 7 6 5 4 3 2 1 0
|
|
D U p1 p2 1 p3 R L
|
|
|
|
L, R = 1 when Left, Right mouse button pressed
|
|
p1..p3 = byte 1..3 odd parity bit
|
|
D, U = 1 when rocker switch pressed Up, Down
|
|
|
|
firmware version 2.x:
|
|
|
|
bit 7 6 5 4 3 2 1 0
|
|
n1 n0 p2 p1 1 p3 R L
|
|
|
|
L, R = 1 when Left, Right mouse button pressed
|
|
p1..p3 = byte 1..3 odd parity bit
|
|
n1..n0 = number of fingers on touchpad
|
|
|
|
byte 1:
|
|
firmware version 1.x:
|
|
|
|
bit 7 6 5 4 3 2 1 0
|
|
f 0 th tw x9 x8 y9 y8
|
|
|
|
tw = 1 when two finger touch
|
|
th = 1 when three finger touch
|
|
f = 1 when finger touch
|
|
|
|
firmware version 2.x:
|
|
|
|
bit 7 6 5 4 3 2 1 0
|
|
. . . . x9 x8 y9 y8
|
|
|
|
byte 2:
|
|
bit 7 6 5 4 3 2 1 0
|
|
x7 x6 x5 x4 x3 x2 x1 x0
|
|
|
|
x9..x0 = absolute x value (horizontal)
|
|
|
|
byte 3:
|
|
bit 7 6 5 4 3 2 1 0
|
|
y7 y6 y5 y4 y3 y2 y1 y0
|
|
|
|
y9..y0 = absolute y value (vertical)
|
|
|
|
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
4. Hardware version 2
|
|
==================
|
|
|
|
|
|
4.1 Registers
|
|
~~~~~~~~~
|
|
|
|
By echoing a hexadecimal value to a register it contents can be altered.
|
|
|
|
For example:
|
|
|
|
echo -n 0x56 > reg_10
|
|
|
|
* reg_10
|
|
|
|
bit 7 6 5 4 3 2 1 0
|
|
0 1 0 1 0 1 D 0
|
|
|
|
D: 1 = enable drag and drop
|
|
|
|
* reg_11
|
|
|
|
bit 7 6 5 4 3 2 1 0
|
|
1 0 0 0 S 0 1 0
|
|
|
|
S: 1 = enable vertical scroll
|
|
|
|
* reg_21
|
|
|
|
unknown (0x00)
|
|
|
|
* reg_22
|
|
|
|
drag and drop release time out (short: 0x70 ... long 0x7e;
|
|
0x7f = never i.e. tap again to release)
|
|
|
|
|
|
4.2 Native absolute mode 6 byte packet format
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
4.2.1 One finger touch
|
|
~~~~~~~~~~~~~~~~
|
|
|
|
byte 0:
|
|
|
|
bit 7 6 5 4 3 2 1 0
|
|
n1 n0 . . . . R L
|
|
|
|
L, R = 1 when Left, Right mouse button pressed
|
|
n1..n0 = numbers of fingers on touchpad
|
|
|
|
byte 1:
|
|
|
|
bit 7 6 5 4 3 2 1 0
|
|
x15 x14 x13 x12 x11 x10 x9 x8
|
|
|
|
byte 2:
|
|
|
|
bit 7 6 5 4 3 2 1 0
|
|
x7 x6 x5 x4 x4 x2 x1 x0
|
|
|
|
x15..x0 = absolute x value (horizontal)
|
|
|
|
byte 3:
|
|
|
|
bit 7 6 5 4 3 2 1 0
|
|
. . . . . . . .
|
|
|
|
byte 4:
|
|
|
|
bit 7 6 5 4 3 2 1 0
|
|
y15 y14 y13 y12 y11 y10 y8 y8
|
|
|
|
byte 5:
|
|
|
|
bit 7 6 5 4 3 2 1 0
|
|
y7 y6 y5 y4 y3 y2 y1 y0
|
|
|
|
y15..y0 = absolute y value (vertical)
|
|
|
|
|
|
4.2.2 Two finger touch
|
|
~~~~~~~~~~~~~~~~
|
|
|
|
byte 0:
|
|
|
|
bit 7 6 5 4 3 2 1 0
|
|
n1 n0 ay8 ax8 . . R L
|
|
|
|
L, R = 1 when Left, Right mouse button pressed
|
|
n1..n0 = numbers of fingers on touchpad
|
|
|
|
byte 1:
|
|
|
|
bit 7 6 5 4 3 2 1 0
|
|
ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
|
|
|
|
ax8..ax0 = first finger absolute x value
|
|
|
|
byte 2:
|
|
|
|
bit 7 6 5 4 3 2 1 0
|
|
ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0
|
|
|
|
ay8..ay0 = first finger absolute y value
|
|
|
|
byte 3:
|
|
|
|
bit 7 6 5 4 3 2 1 0
|
|
. . by8 bx8 . . . .
|
|
|
|
byte 4:
|
|
|
|
bit 7 6 5 4 3 2 1 0
|
|
bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0
|
|
|
|
bx8..bx0 = second finger absolute x value
|
|
|
|
byte 5:
|
|
|
|
bit 7 6 5 4 3 2 1 0
|
|
by7 by8 by5 by4 by3 by2 by1 by0
|
|
|
|
by8..by0 = second finger absolute y value
|