Commit 604aed61 authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab Committed by Dmitry Torokhov
Browse files

Input: elantech - convert documentation into ReST format



This file require minimum adjustments to be a valid ReST file.
Do it, in order to be able to parse it with Sphinx.

We opted to remove section numbers, as this can be automatically
generated on Sphinx, by using :numbered: tag at index.
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent c87d6465
......@@ -10,9 +10,7 @@ Elantech Touchpad Driver
received from Woody at Xandros and forwarded to me
by user StewieGriffin at the eeeuser.com forum
Contents
~~~~~~~~
.. Contents
1. Introduction
2. Extra knobs
......@@ -45,8 +43,8 @@ Contents
1. Introduction
~~~~~~~~~~~~
Introduction
~~~~~~~~~~~~
Currently the Linux Elantech touchpad driver is aware of four different
hardware versions unimaginatively called version 1,version 2, version 3
......@@ -88,11 +86,8 @@ available Elantech documentation the information is provided here anyway for
completeness sake.
/////////////////////////////////////////////////////////////////////////////
2. Extra knobs
~~~~~~~~~~~
Extra knobs
~~~~~~~~~~~
Currently the Linux Elantech touchpad driver provides three extra knobs under
/sys/bus/serio/drivers/psmouse/serio? for the user.
......@@ -142,18 +137,17 @@ Currently the Linux Elantech touchpad driver provides three extra knobs under
Reading the crc_enabled value will show the active value. Echoing
"0" or "1" to this file will set the state to "0" or "1".
/////////////////////////////////////////////////////////////////////////////
Differentiating hardware versions
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3. Differentiating hardware versions
=================================
To detect the hardware version, read the version number as param[0].param[1].param[2]
To detect the hardware version, read the version number as param[0].param[1].param[2]::
4 bytes version: (after the arrow is the name given in the Dell-provided driver)
02.00.22 => EF013
02.06.00 => EF019
In the wild, there appear to be more versions, such as 00.01.64, 01.00.21,
02.00.00, 02.00.04, 02.00.06.
02.00.00, 02.00.04, 02.00.06::
6 bytes:
02.00.30 => EF113
......@@ -162,6 +156,7 @@ In the wild, there appear to be more versions, such as 00.01.64, 01.00.21,
02.0B.00 => EF215
04.01.XX => Scroll_EF051
04.02.XX => EF051
In the wild, there appear to be more versions, such as 04.03.01, 04.04.11. There
appears to be almost no difference, except for EF113, which does not report
pressure/width and has different data consistency checks.
......@@ -170,21 +165,20 @@ Probably all the versions with param[0] <= 01 can be considered as
4 bytes/firmware 1. The versions < 02.08.00, with the exception of 02.00.30, as
4 bytes/firmware 2. Everything >= 02.08.00 can be considered as 6 bytes.
/////////////////////////////////////////////////////////////////////////////
4. Hardware version 1
==================
Hardware version 1
~~~~~~~~~~~~~~~~~~
4.1 Registers
~~~~~~~~~
Registers
---------
By echoing a hexadecimal value to a register it contents can be altered.
For example:
For example::
echo -n 0x16 > reg_10
* reg_10
* reg_10::
bit 7 6 5 4 3 2 1 0
B C T D L A S E
......@@ -198,7 +192,7 @@ For example:
C: 1 = enable corner tap
B: 1 = swap left and right button
* reg_11
* reg_11::
bit 7 6 5 4 3 2 1 0
1 0 0 H V 1 F P
......@@ -208,40 +202,41 @@ For example:
V: 1 = enable vertical scroll area
H: 1 = enable horizontal scroll area
* reg_20
* reg_20::
single finger width?
* reg_21
* reg_21::
scroll area width (small: 0x40 ... wide: 0xff)
* reg_22
* reg_22::
drag lock time out (short: 0x14 ... long: 0xfe;
0xff = tap again to release)
* reg_23
* reg_23::
tap make timeout?
* reg_24
* reg_24::
tap release timeout?
* reg_25
* reg_25::
smart edge cursor speed (0x02 = slow, 0x03 = medium, 0x04 = fast)
* reg_26
* reg_26::
smart edge activation area width?
4.2 Native relative mode 4 byte packet format
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Native relative mode 4 byte packet format
-----------------------------------------
byte 0::
byte 0:
bit 7 6 5 4 3 2 1 0
c c p2 p1 1 M R L
......@@ -251,20 +246,23 @@ byte 0:
p1..p2 = byte 1 and 2 odd parity bit
c = 1 when corner tap detected
byte 1:
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:
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:
byte 3::
parity checking enabled (reg_11, P = 1):
bit 7 6 5 4 3 2 1 0
......@@ -296,14 +294,15 @@ byte 3:
positive = down
4.3 Native absolute mode 4 byte packet format
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Native absolute mode 4 byte packet format
-----------------------------------------
EF013 and EF019 have a special behaviour (due to a bug in the firmware?), and
when 1 finger is touching, the first 2 position reports must be discarded.
This counting is reset whenever a different number of fingers is reported.
byte 0:
byte 0::
firmware version 1.x:
bit 7 6 5 4 3 2 1 0
......@@ -322,7 +321,8 @@ byte 0:
p1..p3 = byte 1..3 odd parity bit
n1..n0 = number of fingers on touchpad
byte 1:
byte 1::
firmware version 1.x:
bit 7 6 5 4 3 2 1 0
......@@ -337,65 +337,68 @@ byte 1:
bit 7 6 5 4 3 2 1 0
. . . . x9 x8 y9 y8
byte 2:
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:
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)
/////////////////////////////////////////////////////////////////////////////
Hardware version 2
~~~~~~~~~~~~~~~~~~
5. Hardware version 2
==================
5.1 Registers
~~~~~~~~~
Registers
---------
By echoing a hexadecimal value to a register it contents can be altered.
For example:
For example::
echo -n 0x56 > reg_10
* 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
* 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
* reg_21::
unknown (0x00)
* reg_22
* reg_22::
drag and drop release time out (short: 0x70 ... long 0x7e;
0x7f = never i.e. tap again to release)
5.2 Native absolute mode 6 byte packet format
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5.2.1 Parity checking and packet re-synchronization
Native absolute mode 6 byte packet format
-----------------------------------------
Parity checking and packet re-synchronization
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
There is no parity checking, however some consistency checks can be performed.
For instance for EF113:
For instance for EF113::
SA1= packet[0];
A1 = packet[1];
B1 = packet[2];
......@@ -410,7 +413,8 @@ For instance for EF113:
(((SA1 & 0xC0) != 0x80) && (( C1 & 0xF0) != 0x00)) ) // check Byte 5
// error detected
For all the other ones, there are just a few constant bits:
For all the other ones, there are just a few constant bits::
if( ((packet[0] & 0x0C) != 0x04) ||
((packet[3] & 0x0f) != 0x02) )
// error detected
......@@ -418,10 +422,10 @@ For all the other ones, there are just a few constant bits:
In case an error is detected, all the packets are shifted by one (and packet[0] is discarded).
5.2.2 One/Three finger touch
~~~~~~~~~~~~~~~~
One/Three finger touch
^^^^^^^^^^^^^^^^^^^^^^
byte 0:
byte 0::
bit 7 6 5 4 3 2 1 0
n1 n0 w3 w2 . . R L
......@@ -429,19 +433,19 @@ byte 0:
L, R = 1 when Left, Right mouse button pressed
n1..n0 = number of fingers on touchpad
byte 1:
byte 1::
bit 7 6 5 4 3 2 1 0
p7 p6 p5 p4 x11 x10 x9 x8
byte 2:
byte 2::
bit 7 6 5 4 3 2 1 0
x7 x6 x5 x4 x3 x2 x1 x0
x11..x0 = absolute x value (horizontal)
byte 3:
byte 3::
bit 7 6 5 4 3 2 1 0
n4 vf w1 w0 . . . b2
......@@ -460,14 +464,14 @@ byte 3:
6 = Another one
7 = Another one
byte 4:
byte 4::
bit 7 6 5 4 3 2 1 0
p3 p1 p2 p0 y11 y10 y9 y8
p7..p0 = pressure (not EF113)
byte 5:
byte 5::
bit 7 6 5 4 3 2 1 0
y7 y6 y5 y4 y3 y2 y1 y0
......@@ -475,15 +479,15 @@ byte 5:
y11..y0 = absolute y value (vertical)
5.2.3 Two finger touch
~~~~~~~~~~~~~~~~
Two finger touch
^^^^^^^^^^^^^^^^
Note that the two pairs of coordinates are not exactly the coordinates of the
two fingers, but only the pair of the lower-left and upper-right coordinates.
So the actual fingers might be situated on the other diagonal of the square
defined by these two points.
byte 0:
byte 0::
bit 7 6 5 4 3 2 1 0
n1 n0 ay8 ax8 . . R L
......@@ -491,47 +495,46 @@ byte 0:
L, R = 1 when Left, Right mouse button pressed
n1..n0 = number of fingers on touchpad
byte 1:
byte 1::
bit 7 6 5 4 3 2 1 0
ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
ax8..ax0 = lower-left finger absolute x value
byte 2:
byte 2::
bit 7 6 5 4 3 2 1 0
ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0
ay8..ay0 = lower-left finger absolute y value
byte 3:
byte 3::
bit 7 6 5 4 3 2 1 0
. . by8 bx8 . . . .
byte 4:
byte 4::
bit 7 6 5 4 3 2 1 0
bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0
bx8..bx0 = upper-right finger absolute x value
byte 5:
byte 5::
bit 7 6 5 4 3 2 1 0
by7 by8 by5 by4 by3 by2 by1 by0
by8..by0 = upper-right finger absolute y value
/////////////////////////////////////////////////////////////////////////////
Hardware version 3
~~~~~~~~~~~~~~~~~~
6. Hardware version 3
==================
Registers
---------
6.1 Registers
~~~~~~~~~
* reg_10
* reg_10::
bit 7 6 5 4 3 2 1 0
0 0 0 0 R F T A
......@@ -541,8 +544,9 @@ byte 5:
F: 1 = disable ABS Position Filter
R: 1 = enable real hardware resolution
6.2 Native absolute mode 6 byte packet format
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Native absolute mode 6 byte packet format
-----------------------------------------
1 and 3 finger touch shares the same 6-byte packet format, except that
3 finger touch only reports the position of the center of all three fingers.
......@@ -552,19 +556,21 @@ Note on debounce:
In case the box has unstable power supply or other electricity issues, or
when number of finger changes, F/W would send "debounce packet" to inform
driver that the hardware is in debounce status.
The debouce packet has the following signature:
The debouce packet has the following signature::
byte 0: 0xc4
byte 1: 0xff
byte 2: 0xff
byte 3: 0x02
byte 4: 0xff
byte 5: 0xff
When we encounter this kind of packet, we just ignore it.
6.2.1 One/Three finger touch
~~~~~~~~~~~~~~~~~~~~~~
One/Three finger touch
^^^^^^^^^^^^^^^^^^^^^^
byte 0:
byte 0::
bit 7 6 5 4 3 2 1 0
n1 n0 w3 w2 0 1 R L
......@@ -572,63 +578,63 @@ byte 0:
L, R = 1 when Left, Right mouse button pressed
n1..n0 = number of fingers on touchpad
byte 1:
byte 1::
bit 7 6 5 4 3 2 1 0
p7 p6 p5 p4 x11 x10 x9 x8
byte 2:
byte 2::
bit 7 6 5 4 3 2 1 0
x7 x6 x5 x4 x3 x2 x1 x0
x11..x0 = absolute x value (horizontal)
byte 3:
byte 3::
bit 7 6 5 4 3 2 1 0
0 0 w1 w0 0 0 1 0
w3..w0 = width of the finger touch
byte 4:
byte 4::
bit 7 6 5 4 3 2 1 0
p3 p1 p2 p0 y11 y10 y9 y8
p7..p0 = pressure
byte 5:
byte 5::
bit 7 6 5 4 3 2 1 0
y7 y6 y5 y4 y3 y2 y1 y0
y11..y0 = absolute y value (vertical)
6.2.2 Two finger touch
~~~~~~~~~~~~~~~~
Two finger touch
^^^^^^^^^^^^^^^^
The packet format is exactly the same for two finger touch, except the hardware
sends two 6 byte packets. The first packet contains data for the first finger,
the second packet has data for the second finger. So for two finger touch a
total of 12 bytes are sent.
/////////////////////////////////////////////////////////////////////////////
Hardware version 4
~~~~~~~~~~~~~~~~~~
7. Hardware version 4
==================
Registers
---------
7.1 Registers
~~~~~~~~~
* reg_07
* reg_07::
bit 7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 A
A: 1 = enable absolute tracking
7.2 Native absolute mode 6 byte packet format
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Native absolute mode 6 byte packet format
-----------------------------------------
v4 hardware is a true multitouch touchpad, capable of tracking up to 5 fingers.
Unfortunately, due to PS/2's limited bandwidth, its packet format is rather
complex.
......@@ -647,45 +653,49 @@ position, until we receive a status packet.
One exception is one finger touch. when a status packet tells us there is only
one finger, the hardware would just send head packets afterwards.
7.2.1 Status packet
~~~~~~~~~~~~~
Status packet
^^^^^^^^^^^^^
byte 0:
byte 0::
bit 7 6 5 4 3 2 1 0
. . . . 0 1 R L
L, R = 1 when Left, Right mouse button pressed
byte 1:
byte 1::
bit 7 6 5 4 3 2 1 0
. . . ft4 ft3 ft2 ft1 ft0
ft4 ft3 ft2 ft1 ft0 ftn = 1 when finger n is on touchpad
byte 2: not used
byte 2::
not used
byte 3:
byte 3::
bit 7 6 5 4 3 2 1 0
. . . 1 0 0 0 0
constant bits
byte 4:
byte 4::
bit 7 6 5 4 3 2 1 0
p . . . . . . .
p = 1 for palm
byte 5: not used
byte 5::
7.2.2 Head packet
~~~~~~~~~~~
not used
byte 0:
Head packet
^^^^^^^^^^^
byte 0::
bit 7 6 5 4 3 2 1 0
w3 w2 w1 w0 0 1 R L
......@@ -693,43 +703,43 @@ byte 0:
L, R = 1 when Left, Right mouse button pressed
w3..w0 = finger width (spans how many trace lines)
byte 1:
byte 1::
bit 7 6 5 4 3 2 1 0
p7 p6 p5 p4 x11 x10 x9 x8
byte 2:
byte 2::
bit 7 6 5 4 3 2 1 0
x7 x6 x5 x4 x3 x2 x1 x0
x11..x0 = absolute x value (horizontal)
byte 3:
byte 3::
bit 7 6 5 4 3 2 1 0
id2 id1 id0 1 0 0 0 1
id2..id0 = finger id
byte 4:
byte 4::
bit 7 6 5 4 3 2 1 0
p3 p1 p2 p0 y11 y10 y9 y8
p7..p0 = pressure
byte 5:
byte 5::
bit 7 6 5 4 3 2 1 0
y7 y6 y5 y4 y3 y2 y1 y0
y11..y0 = absolute y value (vertical)
7.2.3 Motion packet
~~~~~~~~~~~~~
Motion packet
^^^^^^^^^^^^^
byte 0:
byte 0::
bit 7 6 5 4 3 2 1 0
id2 id1 id0 w 0 1 R L
......@@ -739,35 +749,35 @@ byte 0:
w = 1 when delta overflows (> 127 or < -128), in this case
firmware sends us (delta x / 5) and (delta y / 5)
byte 1:
byte 1::
bit 7 6 5 4 3 2 1 0
x7 x6 x5 x4 x3 x2 x1 x0