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authorLinus Torvalds <torvalds@linux-foundation.org>2011-10-27 08:44:20 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2011-10-27 08:44:20 +0200
commit396e6e49c58bb23d1814d3c240c736c9f01523c5 (patch)
treea6ec8dac896c3ea3ac7b1bb0dce8728766afcf91 /Documentation/input
parent18974369cfe23acf16d0fb79e0d1fba7a9a95ec0 (diff)
parent6ad390a25a9d1d8606b9b826878f0a30639dc2b3 (diff)
downloadlinux-396e6e49c58bb23d1814d3c240c736c9f01523c5.tar.gz
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: (68 commits) Input: adp5589-keys - add support for the ADP5585 derivatives Input: imx_keypad - add pm suspend and resume support Input: force feedback - potential integer wrap in input_ff_create() Input: tsc2007 - make sure that X plate resistance is specified Input: serio_raw - fix memory leak when closing char device Input: serio_raw - kick clients when disconnecting port Input: serio_raw - explicitly mark disconnected ports as dead Input: serio_raw - fix coding style issues Input: serio_raw - use dev_*() for messages Input: serio_raw - use bool for boolean data Input: serio_raw - perform proper locking when adding clients to list Input: serio_raw - rename serio_raw_list to serio_raw_client Input: serio_raw - use kref instead of rolling out its own refcounting Input: psmouse - switch to using dev_*() for messages Input: wacom - correct max Y value on medium bamboos Input: wacom - add ABS_DISTANCE to Bamboo Pen reports Input: wacom - remove unneeded touch pressure initialization Input: lm8323 - wrap suspend and resume in CONFIG_PM_SLEEP Input: ad7879-i2c - wrap suspend and resume in CONFIG_PM_SLEEP Input: synaptics_i2c - wrap suspend and resume in CONFIG_PM_SLEEP ...
Diffstat (limited to 'Documentation/input')
-rw-r--r--Documentation/input/elantech.txt295
-rw-r--r--Documentation/input/multi-touch-protocol.txt14
2 files changed, 293 insertions, 16 deletions
diff --git a/Documentation/input/elantech.txt b/Documentation/input/elantech.txt
index db798af5ef9..5602eb71ad5 100644
--- a/Documentation/input/elantech.txt
+++ b/Documentation/input/elantech.txt
@@ -16,15 +16,28 @@ 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
+ 3. Differentiating hardware versions
+ 4. Hardware version 1
4.1 Registers
- 4.2 Native absolute mode 6 byte packet format
- 4.2.1 One finger touch
- 4.2.2 Two finger touch
+ 4.2 Native relative mode 4 byte packet format
+ 4.3 Native absolute mode 4 byte packet format
+ 5. Hardware version 2
+ 5.1 Registers
+ 5.2 Native absolute mode 6 byte packet format
+ 5.2.1 Parity checking and packet re-synchronization
+ 5.2.2 One/Three finger touch
+ 5.2.3 Two finger touch
+ 6. Hardware version 3
+ 6.1 Registers
+ 6.2 Native absolute mode 6 byte packet format
+ 6.2.1 One/Three finger touch
+ 6.2.2 Two finger touch
+ 7. Hardware version 4
+ 7.1 Registers
+ 7.2 Native absolute mode 6 byte packet format
+ 7.2.1 Status packet
+ 7.2.2 Head packet
+ 7.2.3 Motion packet
@@ -375,7 +388,7 @@ 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).
-5.2.1 One/Three finger touch
+5.2.2 One/Three finger touch
~~~~~~~~~~~~~~~~
byte 0:
@@ -384,19 +397,19 @@ byte 0:
n1 n0 w3 w2 . . R L
L, R = 1 when Left, Right mouse button pressed
- n1..n0 = numbers of fingers on touchpad
+ n1..n0 = number of fingers on touchpad
byte 1:
bit 7 6 5 4 3 2 1 0
- p7 p6 p5 p4 . x10 x9 x8
+ p7 p6 p5 p4 x11 x10 x9 x8
byte 2:
bit 7 6 5 4 3 2 1 0
x7 x6 x5 x4 x3 x2 x1 x0
- x10..x0 = absolute x value (horizontal)
+ x11..x0 = absolute x value (horizontal)
byte 3:
@@ -420,7 +433,7 @@ byte 3:
byte 4:
bit 7 6 5 4 3 2 1 0
- p3 p1 p2 p0 . . y9 y8
+ p3 p1 p2 p0 y11 y10 y9 y8
p7..p0 = pressure (not EF113)
@@ -429,10 +442,10 @@ byte 5:
bit 7 6 5 4 3 2 1 0
y7 y6 y5 y4 y3 y2 y1 y0
- y9..y0 = absolute y value (vertical)
+ y11..y0 = absolute y value (vertical)
-4.2.2 Two finger touch
+5.2.3 Two finger touch
~~~~~~~~~~~~~~~~
Note that the two pairs of coordinates are not exactly the coordinates of the
@@ -446,7 +459,7 @@ byte 0:
n1 n0 ay8 ax8 . . R L
L, R = 1 when Left, Right mouse button pressed
- n1..n0 = numbers of fingers on touchpad
+ n1..n0 = number of fingers on touchpad
byte 1:
@@ -480,3 +493,253 @@ byte 5:
by7 by8 by5 by4 by3 by2 by1 by0
by8..by0 = upper-right finger absolute y value
+
+/////////////////////////////////////////////////////////////////////////////
+
+6. Hardware version 3
+ ==================
+
+6.1 Registers
+ ~~~~~~~~~
+* reg_10
+
+ bit 7 6 5 4 3 2 1 0
+ 0 0 0 0 0 0 0 A
+
+ A: 1 = enable absolute tracking
+
+6.2 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.
+
+Firmware would send 12 bytes of data for 2 finger touch.
+
+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:
+ 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
+ ~~~~~~~~~~~~~~~~~~~~~~
+
+byte 0:
+
+ bit 7 6 5 4 3 2 1 0
+ n1 n0 w3 w2 0 1 R L
+
+ L, R = 1 when Left, Right mouse button pressed
+ n1..n0 = number of fingers on touchpad
+
+byte 1:
+
+ bit 7 6 5 4 3 2 1 0
+ p7 p6 p5 p4 x11 x10 x9 x8
+
+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:
+
+ 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:
+
+ bit 7 6 5 4 3 2 1 0
+ p3 p1 p2 p0 y11 y10 y9 y8
+
+ p7..p0 = pressure
+
+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
+ ~~~~~~~~~~~~~~~~
+
+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.
+
+/////////////////////////////////////////////////////////////////////////////
+
+7. Hardware version 4
+ ==================
+
+7.1 Registers
+ ~~~~~~~~~
+* 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
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+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.
+
+Whenever the numbers or identities of the fingers changes, the hardware sends a
+status packet to indicate how many and which fingers is on touchpad, followed by
+head packets or motion packets. A head packet contains data of finger id, finger
+position (absolute x, y values), width, and pressure. A motion packet contains
+two fingers' position delta.
+
+For example, when status packet tells there are 2 fingers on touchpad, then we
+can expect two following head packets. If the finger status doesn't change,
+the following packets would be motion packets, only sending delta of finger
+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
+ ~~~~~~~~~~~~~
+
+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:
+
+ 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 3:
+
+ bit 7 6 5 4 3 2 1 0
+ . . . 1 0 0 0 0
+
+ constant bits
+
+byte 4:
+
+ bit 7 6 5 4 3 2 1 0
+ p . . . . . . .
+
+ p = 1 for palm
+
+byte 5: not used
+
+7.2.2 Head packet
+ ~~~~~~~~~~~
+
+byte 0:
+
+ bit 7 6 5 4 3 2 1 0
+ w3 w2 w1 w0 0 1 R L
+
+ L, R = 1 when Left, Right mouse button pressed
+ w3..w0 = finger width (spans how many trace lines)
+
+byte 1:
+
+ bit 7 6 5 4 3 2 1 0
+ p7 p6 p5 p4 x11 x10 x9 x8
+
+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:
+
+ bit 7 6 5 4 3 2 1 0
+ id2 id1 id0 1 0 0 0 1
+
+ id2..id0 = finger id
+
+byte 4:
+
+ bit 7 6 5 4 3 2 1 0
+ p3 p1 p2 p0 y11 y10 y9 y8
+
+ p7..p0 = pressure
+
+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
+ ~~~~~~~~~~~~~
+
+byte 0:
+
+ bit 7 6 5 4 3 2 1 0
+ id2 id1 id0 w 0 1 R L
+
+ L, R = 1 when Left, Right mouse button pressed
+ id2..id0 = finger id
+ w = 1 when delta overflows (> 127 or < -128), in this case
+ firmware sends us (delta x / 5) and (delta y / 5)
+
+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:
+
+ 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:
+
+ bit 7 6 5 4 3 2 1 0
+ id2 id1 id0 1 0 0 1 0
+
+ id2..id0 = finger id
+
+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:
+
+ 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 0 ~ 2 for one finger
+ byte 3 ~ 5 for another
diff --git a/Documentation/input/multi-touch-protocol.txt b/Documentation/input/multi-touch-protocol.txt
index 71536e78406..543101c5bf2 100644
--- a/Documentation/input/multi-touch-protocol.txt
+++ b/Documentation/input/multi-touch-protocol.txt
@@ -65,6 +65,20 @@ the full state of each initiated contact has to reside in the receiving
end. Upon receiving an MT event, one simply updates the appropriate
attribute of the current slot.
+Some devices identify and/or track more contacts than they can report to the
+driver. A driver for such a device should associate one type B slot with each
+contact that is reported by the hardware. Whenever the identity of the
+contact associated with a slot changes, the driver should invalidate that
+slot by changing its ABS_MT_TRACKING_ID. If the hardware signals that it is
+tracking more contacts than it is currently reporting, the driver should use
+a BTN_TOOL_*TAP event to inform userspace of the total number of contacts
+being tracked by the hardware at that moment. The driver should do this by
+explicitly sending the corresponding BTN_TOOL_*TAP event and setting
+use_count to false when calling input_mt_report_pointer_emulation().
+The driver should only advertise as many slots as the hardware can report.
+Userspace can detect that a driver can report more total contacts than slots
+by noting that the largest supported BTN_TOOL_*TAP event is larger than the
+total number of type B slots reported in the absinfo for the ABS_MT_SLOT axis.
Protocol Example A
------------------