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-rw-r--r--Documentation/input/elantech.txt306
1 files changed, 165 insertions, 141 deletions
diff --git a/Documentation/input/elantech.txt b/Documentation/input/elantech.txt
index 1ec0db7879d3..c3374a7ce7af 100644
--- a/Documentation/input/elantech.txt
+++ b/Documentation/input/elantech.txt
@@ -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
x7..x0 = delta x (two's complement)
-byte 2:
+byte 2::
bit 7 6 5 4 3 2 1 0
y7 y6 y5 y4 y3 y2 y1 y0
y7..y0 = delta y (two's complement)
-byte 3:
+byte 3::
bit 7 6 5 4 3 2 1 0
id2 id1 id0 1 0 0 1 0
id2..id0 = finger id
-byte 4:
+byte 4::
bit 7 6 5 4 3 2 1 0
x7 x6 x5 x4 x3 x2 x1 x0
x7..x0 = delta x (two's complement)
-byte 5:
+byte 5::
bit 7 6 5 4 3 2 1 0
y7 y6 y5 y4 y3 y2 y1 y0
@@ -778,33 +788,47 @@ byte 5:
byte 3 ~ 5 for another
-8. Trackpoint (for Hardware version 3 and 4)
- =========================================
-8.1 Registers
- ~~~~~~~~~
+Trackpoint (for Hardware version 3 and 4)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Registers
+---------
+
No special registers have been identified.
-8.2 Native relative mode 6 byte packet format
- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-8.2.1 Status Packet
- ~~~~~~~~~~~~~
+Native relative mode 6 byte packet format
+-----------------------------------------
+
+Status Packet
+^^^^^^^^^^^^^
+
+byte 0::
-byte 0:
bit 7 6 5 4 3 2 1 0
0 0 sx sy 0 M R L
-byte 1:
+
+byte 1::
+
bit 7 6 5 4 3 2 1 0
~sx 0 0 0 0 0 0 0
-byte 2:
+
+byte 2::
+
bit 7 6 5 4 3 2 1 0
~sy 0 0 0 0 0 0 0
-byte 3:
+
+byte 3::
+
bit 7 6 5 4 3 2 1 0
0 0 ~sy ~sx 0 1 1 0
-byte 4:
+
+byte 4::
+
bit 7 6 5 4 3 2 1 0
x7 x6 x5 x4 x3 x2 x1 x0
-byte 5:
+
+byte 5::
+
bit 7 6 5 4 3 2 1 0
y7 y6 y5 y4 y3 y2 y1 y0
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-18 09:07:07 +0100