Merge branches 'arm/rockchip', 'arm/exynos', 'arm/smmu', 'x86/vt-d', 'x86/amd', ...

[karo-tx-linux.git] / Documentation / input / alps.txt

diff --git a/Documentation/input/alps.txt b/Documentation/input/alps.txt
index 92ae734c00c348ab810373e0dc838a92462c932f..c86f2f1ae4f6aa2d9af3e3987e8be06fd237dbef 100644 (file)
--- a/Documentation/input/alps.txt
+++ b/Documentation/input/alps.txt
@@ -58,7 +58,7 @@ To exit command mode, PSMOUSE_CMD_SETSTREAM (EA) is sent to the touchpad.
 While in command mode, register addresses can be set by first sending a
 specific command, either EC for v3 devices or F5 for v4 devices. Then the
 address is sent one nibble at a time, where each nibble is encoded as a
-command with optional data. This enoding differs slightly between the v3 and
+command with optional data. This encoding differs slightly between the v3 and
 v4 protocols.
 
 Once an address has been set, the addressed register can be read by sending
@@ -94,6 +94,10 @@ PS/2 packet format
 
 Note that the device never signals overflow condition.
 
+For protocol version 2 devices when the trackpoint is used, and no fingers
+are on the touchpad, the M R L bits signal the combined status of both the
+pointingstick and touchpad buttons.
+
 ALPS Absolute Mode - Protocol Version 1
 --------------------------------------
 
@@ -107,7 +111,7 @@ ALPS Absolute Mode - Protocol Version 1
 ALPS Absolute Mode - Protocol Version 2
 ---------------------------------------
 
- byte 0:  1    ?    ?    ?    1    ?    ?    ?
+ byte 0:  1    ?    ?    ?    1  PSM  PSR  PSL
  byte 1:  0   x6   x5   x4   x3   x2   x1   x0
  byte 2:  0  x10   x9   x8   x7    ?  fin  ges
  byte 3:  0   y9   y8   y7    1    M    R    L
@@ -115,7 +119,8 @@ ALPS Absolute Mode - Protocol Version 2
  byte 5:  0   z6   z5   z4   z3   z2   z1   z0
 
 Protocol Version 2 DualPoint devices send standard PS/2 mouse packets for
-the DualPoint Stick.
+the DualPoint Stick. For non interleaved dualpoint devices the pointingstick
+buttons get reported separately in the PSM, PSR and PSL bits.
 
 Dualpoint device -- interleaved packet format
 ---------------------------------------------
@@ -139,7 +144,7 @@ ALPS Absolute Mode - Protocol Version 3
 ---------------------------------------
 
 ALPS protocol version 3 has three different packet formats. The first two are
-associated with touchpad events, and the third is associatd with trackstick
+associated with touchpad events, and the third is associated with trackstick
 events.
 
 The first type is the touchpad position packet.