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Enable middle-mouse button emulation.

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Ported from xf86-input-mouse, with a few cleanups.
This commit is contained in:
Peter Hutterer
2008-06-10 15:55:40 +09:30
parent b0f6987ee6
commit e8887435ac
5 changed files with 418 additions and 28 deletions
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13
man/evdev.man
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@@ -10,6 +10,8 @@ evdev \- Generic Linux input driver
.B " Driver \*qevdev\*q"
.BI " Option \*qDevice\*q \*q" devpath \*q
.BI " Option \*qPath\*q \*q" path \*q
.BI " Option \*qEmulate3Buttons\*q \*q" True \*q
.BI " Option \*qEmulate3Timeout\*q \*q" 50 \*q
\ \ ...
.B EndSection
.fi
@@ -54,6 +56,17 @@ generally be of the form \*q/dev/input/by-path/xyz\*q, where xyz includes the
name of the device. The mapping from device node to hardware is
system-dependent. This option has precedence over the \*qDevice\*q option but
one of \*qPath\*q or \*qDevice\*q must be given.
.TP 7
.BI "Option \*qEmulate3Buttons\*q \*q" boolean \*q
Enable/disable the emulation of the third (middle) mouse button for mice
which only have two physical buttons. The third button is emulated by
pressing both buttons simultaneously. Default: on, unless the device reports
the presence of a physical button 3.
.TP 7
.BI "Option \*qEmulate3Timeout\*q \*q" integer \*q
Sets the timeout (in milliseconds) that the driver waits before deciding
if two buttons where pressed "simultaneously" when 3 button emulation is
enabled. Default: 50.
.SH AUTHORS
Kristian Høgsberg.
.SH "SEE ALSO"

4
src/Makefile.am
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@@ -28,4 +28,6 @@
@DRIVER_NAME@_drv_la_LDFLAGS = -module -avoid-version
@DRIVER_NAME@_drv_ladir = @inputdir@
@DRIVER_NAME@_drv_la_SOURCES = @DRIVER_NAME@.c
@DRIVER_NAME@_drv_la_SOURCES = @DRIVER_NAME@.c \
@DRIVER_NAME@.h \
emuMB.c

308
src/emuMB.c Normal file
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@@ -0,0 +1,308 @@
/*
* Copyright 1990,91 by Thomas Roell, Dinkelscherben, Germany.
* Copyright 1993 by David Dawes <dawes@xfree86.org>
* Copyright 2002 by SuSE Linux AG, Author: Egbert Eich
* Copyright 1994-2002 by The XFree86 Project, Inc.
* Copyright 2002 by Paul Elliott
* (Ported from xf86-input-mouse, above copyrights taken from there)
* Copyright © 2008 University of South Australia
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that the above copyright notice appear in all copies
* and that both that copyright notice and this permission notice
* appear in supporting documentation, and that the name of Red Hat
* not be used in advertising or publicity pertaining to distribution
* of the software without specific, written prior permission. Red
* Hat makes no representations about the suitability of this software
* for any purpose. It is provided "as is" without express or implied
* warranty.
*
* THE AUTHORS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
* NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
/* Middle mouse button emulation code. */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "evdev.h"
/*
* Lets create a simple finite-state machine for 3 button emulation:
*
* We track buttons 1 and 3 (left and right). There are 11 states:
* 0 ground - initial state
* 1 delayed left - left pressed, waiting for right
* 2 delayed right - right pressed, waiting for left
* 3 pressed middle - right and left pressed, emulated middle sent
* 4 pressed left - left pressed and sent
* 5 pressed right - right pressed and sent
* 6 released left - left released after emulated middle
* 7 released right - right released after emulated middle
* 8 repressed left - left pressed after released left
* 9 repressed right - right pressed after released right
* 10 pressed both - both pressed, not emulating middle
*
* At each state, we need handlers for the following events
* 0: no buttons down
* 1: left button down
* 2: right button down
* 3: both buttons down
* 4: emulate3Timeout passed without a button change
* Note that button events are not deltas, they are the set of buttons being
* pressed now. It's possible (ie, mouse hardware does it) to go from (eg)
* left down to right down without anything in between, so all cases must be
* handled.
*
* a handler consists of three values:
* 0: action1
* 1: action2
* 2: new emulation state
*
* action > 0: ButtonPress
* action = 0: nothing
* action < 0: ButtonRelease
*
* The comment preceeding each section is the current emulation state.
* The comments to the right are of the form
* <button state> (<events>) -> <new emulation state>
* which should be read as
* If the buttons are in <button state>, generate <events> then go to
* <new emulation state>.
*/
static signed char stateTab[11][5][3] = {
/* 0 ground */
{
{ 0, 0, 0 }, /* nothing -> ground (no change) */
{ 0, 0, 1 }, /* left -> delayed left */
{ 0, 0, 2 }, /* right -> delayed right */
{ 2, 0, 3 }, /* left & right (middle press) -> pressed middle */
{ 0, 0, -1 } /* timeout N/A */
},
/* 1 delayed left */
{
{ 1, -1, 0 }, /* nothing (left event) -> ground */
{ 0, 0, 1 }, /* left -> delayed left (no change) */
{ 1, -1, 2 }, /* right (left event) -> delayed right */
{ 2, 0, 3 }, /* left & right (middle press) -> pressed middle */
{ 1, 0, 4 }, /* timeout (left press) -> pressed left */
},
/* 2 delayed right */
{
{ 3, -3, 0 }, /* nothing (right event) -> ground */
{ 3, -3, 1 }, /* left (right event) -> delayed left (no change) */
{ 0, 0, 2 }, /* right -> delayed right (no change) */
{ 2, 0, 3 }, /* left & right (middle press) -> pressed middle */
{ 3, 0, 5 }, /* timeout (right press) -> pressed right */
},
/* 3 pressed middle */
{
{ -2, 0, 0 }, /* nothing (middle release) -> ground */
{ 0, 0, 7 }, /* left -> released right */
{ 0, 0, 6 }, /* right -> released left */
{ 0, 0, 3 }, /* left & right -> pressed middle (no change) */
{ 0, 0, -1 }, /* timeout N/A */
},
/* 4 pressed left */
{
{ -1, 0, 0 }, /* nothing (left release) -> ground */
{ 0, 0, 4 }, /* left -> pressed left (no change) */
{ -1, 0, 2 }, /* right (left release) -> delayed right */
{ 3, 0, 10 }, /* left & right (right press) -> pressed both */
{ 0, 0, -1 }, /* timeout N/A */
},
/* 5 pressed right */
{
{ -3, 0, 0 }, /* nothing (right release) -> ground */
{ -3, 0, 1 }, /* left (right release) -> delayed left */
{ 0, 0, 5 }, /* right -> pressed right (no change) */
{ 1, 0, 10 }, /* left & right (left press) -> pressed both */
{ 0, 0, -1 }, /* timeout N/A */
},
/* 6 released left */
{
{ -2, 0, 0 }, /* nothing (middle release) -> ground */
{ -2, 0, 1 }, /* left (middle release) -> delayed left */
{ 0, 0, 6 }, /* right -> released left (no change) */
{ 1, 0, 8 }, /* left & right (left press) -> repressed left */
{ 0, 0, -1 }, /* timeout N/A */
},
/* 7 released right */
{
{ -2, 0, 0 }, /* nothing (middle release) -> ground */
{ 0, 0, 7 }, /* left -> released right (no change) */
{ -2, 0, 2 }, /* right (middle release) -> delayed right */
{ 3, 0, 9 }, /* left & right (right press) -> repressed right */
{ 0, 0, -1 }, /* timeout N/A */
},
/* 8 repressed left */
{
{ -2, -1, 0 }, /* nothing (middle release, left release) -> ground */
{ -2, 0, 4 }, /* left (middle release) -> pressed left */
{ -1, 0, 6 }, /* right (left release) -> released left */
{ 0, 0, 8 }, /* left & right -> repressed left (no change) */
{ 0, 0, -1 }, /* timeout N/A */
},
/* 9 repressed right */
{
{ -2, -3, 0 }, /* nothing (middle release, right release) -> ground */
{ -3, 0, 7 }, /* left (right release) -> released right */
{ -2, 0, 5 }, /* right (middle release) -> pressed right */
{ 0, 0, 9 }, /* left & right -> repressed right (no change) */
{ 0, 0, -1 }, /* timeout N/A */
},
/* 10 pressed both */
{
{ -1, -3, 0 }, /* nothing (left release, right release) -> ground */
{ -3, 0, 4 }, /* left (right release) -> pressed left */
{ -1, 0, 5 }, /* right (left release) -> pressed right */
{ 0, 0, 10 }, /* left & right -> pressed both (no change) */
{ 0, 0, -1 }, /* timeout N/A */
},
};
int
EvdevMBEmuTimer(InputInfoPtr pInfo)
{
EvdevPtr pEvdev = pInfo->private;
int sigstate;
int id;
sigstate = xf86BlockSIGIO ();
pEvdev->emulateMB.pending = FALSE;
if ((id = stateTab[pEvdev->emulateMB.state][4][0]) != 0) {
xf86PostButtonEvent(pInfo->dev, 0, abs(id), (id >= 0), 0, 0);
pEvdev->emulateMB.state =
stateTab[pEvdev->emulateMB.state][4][2];
} else {
ErrorF("Got unexpected buttonTimer in state %d\n",
pEvdev->emulateMB.state);
}
xf86UnblockSIGIO (sigstate);
return 0;
}
/**
* Emulate a middle button on button press.
*
* @param code Evdev event code (BTN_LEFT or BTN_RIGHT)
* @param press TRUE if press, FALSE if release.
*
* @return TRUE if event was swallowed by middle mouse button emulation, FALSE
* otherwise.
*/
BOOL
EvdevMBEmuFilterEvent(InputInfoPtr pInfo, int code, BOOL press)
{
EvdevPtr pEvdev = pInfo->private;
int id;
int *btstate;
int ret = FALSE;
if (!pEvdev->emulateMB.enabled)
return ret;
/* don't care about other buttons */
if (code != BTN_LEFT && code != BTN_RIGHT)
return ret;
btstate = &pEvdev->emulateMB.buttonstate;
if (press)
*btstate |= (code == BTN_LEFT) ? 0x1 : 0x2;
else
*btstate &= (code == BTN_LEFT) ? ~0x1 : ~0x2;
if ((id = stateTab[pEvdev->emulateMB.state][*btstate][0]) != 0)
{
xf86PostButtonEvent(pInfo->dev, 0, abs(id), (id >= 0), 0, 0);
ret = TRUE;
}
if ((id = stateTab[pEvdev->emulateMB.state][*btstate][1]) != 0)
{
xf86PostButtonEvent(pInfo->dev, 0, abs(id), (id >= 0), 0, 0);
ret = TRUE;
}
pEvdev->emulateMB.state =
stateTab[pEvdev->emulateMB.state][*btstate][2];
if (stateTab[pEvdev->emulateMB.state][4][0] != 0) {
pEvdev->emulateMB.expires = GetTimeInMillis () + pEvdev->emulateMB.timeout;
pEvdev->emulateMB.pending = TRUE;
ret = TRUE;
} else {
pEvdev->emulateMB.pending = FALSE;
}
return ret;
}
void EvdevMBEmuWakeupHandler(pointer data,
int i,
pointer LastSelectMask)
{
InputInfoPtr pInfo = (InputInfoPtr)data;
EvdevPtr pEvdev = (EvdevPtr)pInfo->private;
int ms;
if (pEvdev->emulateMB.pending)
{
ms = pEvdev->emulateMB.expires - GetTimeInMillis();
if (ms <= 0)
EvdevMBEmuTimer(pInfo);
}
}
void EvdevMBEmuBlockHandler(pointer data,
struct timeval **waitTime,
pointer LastSelectMask)
{
InputInfoPtr pInfo = (InputInfoPtr) data;
EvdevPtr pEvdev= (EvdevPtr) pInfo->private;
int ms;
if (pEvdev->emulateMB.pending)
{
ms = pEvdev->emulateMB.expires - GetTimeInMillis ();
if (ms <= 0)
ms = 0;
AdjustWaitForDelay (waitTime, ms);
}
}
void
EvdevMBEmuPreInit(InputInfoPtr pInfo)
{
EvdevPtr pEvdev = (EvdevPtr)pInfo->private;
pEvdev->emulateMB.enabled = xf86SetBoolOption(pInfo->options,
"Emulate3Buttons", TRUE);
pEvdev->emulateMB.timeout = xf86SetIntOption(pInfo->options,
"Emulate3Timeout", 50);
RegisterBlockAndWakeupHandlers (EvdevMBEmuBlockHandler,
EvdevMBEmuWakeupHandler,
(pointer)pInfo);
}
/* Enable/disable middle mouse button emulation. */
void
EvdevMBEmuEnable(InputInfoPtr pInfo, BOOL enable)
{
EvdevPtr pEvdev = (EvdevPtr)pInfo->private;
pEvdev->emulateMB.enabled = enable;
}

41
src/evdev.c
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@@ -33,7 +33,6 @@
#include <X11/XF86keysym.h>
#include <X11/extensions/XIproto.h>
#include <linux/input.h>
#include <unistd.h>
#include <misc.h>
@@ -44,10 +43,7 @@
#include <exevents.h>
#include <mipointer.h>
#if defined(XKB)
/* XXX VERY WRONG. this is a client side header. */
#include <X11/extensions/XKBstr.h>
#endif
#include "evdev.h"
#include <xf86Module.h>
@@ -91,25 +87,6 @@
#define MODEFLAG 8
#define COMPOSEFLAG 16
typedef struct {
int kernel24;
int screen;
int min_x, min_y, max_x, max_y;
int abs_x, abs_y, old_x, old_y;
int flags;
int tool;
/* XKB stuff has to be per-device rather than per-driver */
int noXkb;
#ifdef XKB
char *xkb_rules;
char *xkb_model;
char *xkb_layout;
char *xkb_variant;
char *xkb_options;
XkbComponentNamesRec xkbnames;
#endif
} EvdevRec, *EvdevPtr;
static const char *evdevDefaults[] = {
"XkbRules", "base",
@@ -241,10 +218,12 @@ EvdevReadInput(InputInfoPtr pInfo)
switch (ev.code) {
/* swap here, pretend we're an X-conformant device. */
case BTN_LEFT:
xf86PostButtonEvent(pInfo->dev, 0, 1, value, 0, 0);
if (!EvdevMBEmuFilterEvent(pInfo, ev.code, value))
xf86PostButtonEvent(pInfo->dev, 0, 1, value, 0, 0);
break;
case BTN_RIGHT:
xf86PostButtonEvent(pInfo->dev, 0, 3, value, 0, 0);
if (!EvdevMBEmuFilterEvent(pInfo, ev.code, value))
xf86PostButtonEvent(pInfo->dev, 0, 3, value, 0, 0);
break;
case BTN_MIDDLE:
xf86PostButtonEvent(pInfo->dev, 0, 2, value, 0, 0);
@@ -964,6 +943,12 @@ EvdevProbe(InputInfoPtr pInfo)
has_buttons = TRUE;
}
if (TestBit(BTN_MIDDLE, key_bitmask)) {
xf86Msg(X_INFO, "%s: Found middle button. Disabling emulation.\n",
pInfo->name);
EvdevMBEmuEnable(pInfo, FALSE);
}
for (i = 0; i < BTN_MISC; i++)
if (TestBit(i, key_bitmask))
break;
@@ -1044,6 +1029,8 @@ EvdevPreInit(InputDriverPtr drv, IDevPtr dev, int flags)
*/
pEvdev->tool = 1;
EvdevMBEmuPreInit(pInfo);
device = xf86CheckStrOption(dev->commonOptions, "Path", NULL);
if (!device)
device = xf86CheckStrOption(dev->commonOptions, "Device", NULL);
@@ -1052,7 +1039,7 @@ EvdevPreInit(InputDriverPtr drv, IDevPtr dev, int flags)
xf86DeleteInput(pInfo, 0);
return NULL;
}
xf86Msg(deviceFrom, "%s: Device: \"%s\"\n", pInfo->name, device);
do {
pInfo->fd = open(device, O_RDWR, 0);

80
src/evdev.h Normal file
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@@ -0,0 +1,80 @@
/*
* Copyright © 2004-2008 Red Hat, Inc.
* Copyright © 2008 University of South Australia
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that the above copyright notice appear in all copies
* and that both that copyright notice and this permission notice
* appear in supporting documentation, and that the name of Red Hat
* not be used in advertising or publicity pertaining to distribution
* of the software without specific, written prior permission. Red
* Hat makes no representations about the suitability of this software
* for any purpose. It is provided "as is" without express or implied
* warranty.
*
* THE AUTHORS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
* NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Authors:
* Kristian Høgsberg (krh@redhat.com)
* Adam Jackson (ajax@redhat.com)
* Peter Hutterer (peter@cs.unisa.edu.au)
*/
#ifndef EVDEV_H
#define EVDEV_H
#include <linux/input.h>
#include <xf86Xinput.h>
#include <xf86_OSproc.h>
#if defined(XKB)
/* XXX VERY WRONG. this is a client side header. */
#include <X11/extensions/XKBstr.h>
#endif
typedef struct {
int kernel24;
int screen;
int min_x, min_y, max_x, max_y;
int abs_x, abs_y, old_x, old_y;
int flags;
int tool;
/* XKB stuff has to be per-device rather than per-driver */
int noXkb;
#ifdef XKB
char *xkb_rules;
char *xkb_model;
char *xkb_layout;
char *xkb_variant;
char *xkb_options;
XkbComponentNamesRec xkbnames;
#endif
/* Middle mouse button emulation */
struct {
BOOL enabled;
BOOL pending; /* timer waiting? */
int buttonstate; /* phys. button state */
int state; /* state machine (see bt3emu.c) */
Time expires; /* time of expiry */
Time timeout;
} emulateMB;
} EvdevRec, *EvdevPtr;
/* Middle Button emulation */
int EvdevMBEmuTimer(InputInfoPtr);
BOOL EvdevMBEmuFilterEvent(InputInfoPtr, int, BOOL);
void EvdevMBEmuWakeupHandler(pointer, int, pointer);
void EvdevMBEmuBlockHandler(pointer, struct timeval**, pointer);
void EvdevMBEmuPreInit(InputInfoPtr);
void EvdevMBEmuEnable(InputInfoPtr, BOOL);
#endif