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authorÉric Piel <E.A.B.Piel@tudelft.nl>2011-05-16 22:45:54 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2011-05-16 22:48:24 -0700
commit71c6d18859ccb137343017ec995b76d9f62bd9b0 (patch)
treeec41f95956a7107c65a6322210471e17aae3d89b /Documentation/input
parent215ef98677c3e43cefd2159d76543f368a7f87b9 (diff)
downloadlinux-71c6d18859ccb137343017ec995b76d9f62bd9b0.tar.gz
Input: elantech - describe further the protocol
For some Dell laptops, Ubuntu had a special version of the elantech driver with more knowledge on the devices. It can be found there: http://zinc.ubuntu.com/git?p=mid-team/hardy-netbook.git;a=blob;f=drivers/input/mouse/elantech.c;h=d0e2cafed162428f72e3654f4dda85e08ea486b3;hb=refs/heads/abi-22 By inspecting the source code, and doing some test on a real hardware, I have completed the protocol specification (especially for the 6 bytes protocol). It also adds information about the mapping between the version reported by the device and the protocol to use. Signed-off-by: Éric Piel <eric.piel@tremplin-utc.net> Reviewed-by: Henrik Rydberg <rydberg@euromail.se> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'Documentation/input')
-rw-r--r--Documentation/input/elantech.txt123
1 files changed, 100 insertions, 23 deletions
diff --git a/Documentation/input/elantech.txt b/Documentation/input/elantech.txt
index 56941ae1f5d..db798af5ef9 100644
--- a/Documentation/input/elantech.txt
+++ b/Documentation/input/elantech.txt
@@ -34,7 +34,8 @@ Contents
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.
+be introduced with the EeePC and uses 6 bytes per packet, and provides
+additional features such as position of two fingers, and width of the touch.
The driver tries to support both hardware versions and should be compatible
with the Xorg Synaptics touchpad driver and its graphical configuration
@@ -94,18 +95,44 @@ Currently the Linux Elantech touchpad driver provides two extra knobs under
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.
-
+ Hardware version 2 does not provide the same parity bits. Only some basic
+ data consistency checking can be done. For now checking is disabled by
+ default. Currently even turning it on will do nothing.
/////////////////////////////////////////////////////////////////////////////
+3. Differentiating hardware versions
+ =================================
+
+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.
+
+ 6 bytes:
+ 02.00.30 => EF113
+ 02.08.00 => EF023
+ 02.08.XX => EF123
+ 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.
+
+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.
+
+/////////////////////////////////////////////////////////////////////////////
-3. Hardware version 1
+4. Hardware version 1
==================
-3.1 Registers
+4.1 Registers
~~~~~~~~~
By echoing a hexadecimal value to a register it contents can be altered.
@@ -168,7 +195,7 @@ For example:
smart edge activation area width?
-3.2 Native relative mode 4 byte packet format
+4.2 Native relative mode 4 byte packet format
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
byte 0:
@@ -226,9 +253,13 @@ byte 3:
positive = down
-3.3 Native absolute mode 4 byte packet format
+4.3 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:
firmware version 1.x:
@@ -279,11 +310,11 @@ byte 3:
/////////////////////////////////////////////////////////////////////////////
-4. Hardware version 2
+5. Hardware version 2
==================
-4.1 Registers
+5.1 Registers
~~~~~~~~~
By echoing a hexadecimal value to a register it contents can be altered.
@@ -316,16 +347,41 @@ For example:
0x7f = never i.e. tap again to release)
-4.2 Native absolute mode 6 byte packet format
+5.2 Native absolute mode 6 byte packet format
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-4.2.1 One finger touch
+5.2.1 Parity checking and packet re-synchronization
+There is no parity checking, however some consistency checks can be performed.
+
+For instance for EF113:
+ SA1= packet[0];
+ A1 = packet[1];
+ B1 = packet[2];
+ SB1= packet[3];
+ C1 = packet[4];
+ D1 = packet[5];
+ if( (((SA1 & 0x3C) != 0x3C) && ((SA1 & 0xC0) != 0x80)) || // check Byte 1
+ (((SA1 & 0x0C) != 0x0C) && ((SA1 & 0xC0) == 0x80)) || // check Byte 1 (one finger pressed)
+ (((SA1 & 0xC0) != 0x80) && (( A1 & 0xF0) != 0x00)) || // check Byte 2
+ (((SB1 & 0x3E) != 0x38) && ((SA1 & 0xC0) != 0x80)) || // check Byte 4
+ (((SB1 & 0x0E) != 0x08) && ((SA1 & 0xC0) == 0x80)) || // check Byte 4 (one finger pressed)
+ (((SA1 & 0xC0) != 0x80) && (( C1 & 0xF0) != 0x00)) ) // check Byte 5
+ // error detected
+
+For all the other ones, there are just a few constant bits:
+ if( ((packet[0] & 0x0C) != 0x04) ||
+ ((packet[3] & 0x0f) != 0x02) )
+ // error detected
+
+
+In case an error is detected, all the packets are shifted by one (and packet[0] is discarded).
+
+5.2.1 One/Three finger touch
~~~~~~~~~~~~~~~~
byte 0:
bit 7 6 5 4 3 2 1 0
- n1 n0 . . . . R L
+ n1 n0 w3 w2 . . R L
L, R = 1 when Left, Right mouse button pressed
n1..n0 = numbers of fingers on touchpad
@@ -333,24 +389,40 @@ byte 0:
byte 1:
bit 7 6 5 4 3 2 1 0
- . . . . . x10 x9 x8
+ p7 p6 p5 p4 . x10 x9 x8
byte 2:
bit 7 6 5 4 3 2 1 0
- x7 x6 x5 x4 x4 x2 x1 x0
+ x7 x6 x5 x4 x3 x2 x1 x0
x10..x0 = absolute x value (horizontal)
byte 3:
bit 7 6 5 4 3 2 1 0
- . . . . . . . .
+ n4 vf w1 w0 . . . b2
+
+ n4 = set if more than 3 fingers (only in 3 fingers mode)
+ vf = a kind of flag ? (only on EF123, 0 when finger is over one
+ of the buttons, 1 otherwise)
+ w3..w0 = width of the finger touch (not EF113)
+ b2 (on EF113 only, 0 otherwise), b2.R.L indicates one button pressed:
+ 0 = none
+ 1 = Left
+ 2 = Right
+ 3 = Middle (Left and Right)
+ 4 = Forward
+ 5 = Back
+ 6 = Another one
+ 7 = Another one
byte 4:
bit 7 6 5 4 3 2 1 0
- . . . . . . y9 y8
+ p3 p1 p2 p0 . . y9 y8
+
+ p7..p0 = pressure (not EF113)
byte 5:
@@ -363,6 +435,11 @@ byte 5:
4.2.2 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:
bit 7 6 5 4 3 2 1 0
@@ -376,14 +453,14 @@ 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
+ ax8..ax0 = lower-left 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
+ ay8..ay0 = lower-left finger absolute y value
byte 3:
@@ -395,11 +472,11 @@ 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
+ bx8..bx0 = upper-right 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
+ by8..by0 = upper-right finger absolute y value