driver/multitouch.c - chromiumos/third_party/multitouch - Git at Google

 /***************************************************************************
  *
  * Multitouch X driver
  * Copyright (C) 2008 Henrik Rydberg <rydberg@euromail.se>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  *
  **************************************************************************/

 #include "gestures.h"

 #if GET_ABI_MAJOR(ABI_XINPUT_VERSION) >= 7
 #include <X11/Xatom.h>
 #include <xserver-properties.h>
 #endif

 #if GET_ABI_MAJOR(ABI_XINPUT_VERSION) >= 12
 typedef InputInfoPtr LocalDevicePtr;
 #endif

 /* these should be user-configurable at some point */
 static const float vscroll_fraction = 0.025;
 static const float hscroll_fraction = 0.05;
 static const float vswipe_fraction = 0.25;
 static const float hswipe_fraction = 0.25;
 static const float scale_fraction = 0.05;
 static const float rot_fraction = 0.05;

 /* button mapping simplified */
 #define PROPMAP(m, x, y) m[x] = XIGetKnownProperty(y)

 static void pointer_control(DeviceIntPtr dev, PtrCtrl *ctrl)
 {
 	xf86Msg(X_INFO, "pointer_control\n");
 }

 static int pointer_property(DeviceIntPtr dev,
 			    Atom property,
 			    XIPropertyValuePtr prop,
 			    BOOL checkonly)
 {
 	xf86Msg(X_INFO, "pointer_property\n");
 	return Success;
 }

 #if GET_ABI_MAJOR(ABI_XINPUT_VERSION) >= 7
 static void initAxesLabels(Atom map[2])
 {
 	memset(map, 0, 2 * sizeof(Atom));
 	PROPMAP(map, 0, AXIS_LABEL_PROP_REL_X);
 	PROPMAP(map, 1, AXIS_LABEL_PROP_REL_Y);
 }

 static void initButtonLabels(Atom map[DIM_BUTTON])
 {
 	memset(map, 0, DIM_BUTTON * sizeof(Atom));
 	PROPMAP(map, MT_BUTTON_LEFT, BTN_LABEL_PROP_BTN_LEFT);
 	PROPMAP(map, MT_BUTTON_MIDDLE, BTN_LABEL_PROP_BTN_MIDDLE);
 	PROPMAP(map, MT_BUTTON_RIGHT, BTN_LABEL_PROP_BTN_RIGHT);
 	PROPMAP(map, MT_BUTTON_WHEEL_UP, BTN_LABEL_PROP_BTN_WHEEL_UP);
 	PROPMAP(map, MT_BUTTON_WHEEL_DOWN, BTN_LABEL_PROP_BTN_WHEEL_DOWN);
 	PROPMAP(map, MT_BUTTON_HWHEEL_LEFT, BTN_LABEL_PROP_BTN_HWHEEL_LEFT);
 	PROPMAP(map, MT_BUTTON_HWHEEL_RIGHT, BTN_LABEL_PROP_BTN_HWHEEL_RIGHT);
 	/* how to map swipe buttons? */
 	PROPMAP(map, MT_BUTTON_SWIPE_UP, BTN_LABEL_PROP_BTN_0);
 	PROPMAP(map, MT_BUTTON_SWIPE_DOWN, BTN_LABEL_PROP_BTN_1);
 	PROPMAP(map, MT_BUTTON_SWIPE_LEFT, BTN_LABEL_PROP_BTN_2);
 	PROPMAP(map, MT_BUTTON_SWIPE_RIGHT, BTN_LABEL_PROP_BTN_3);
 	/* how to map scale and rotate? */
 	PROPMAP(map, MT_BUTTON_SCALE_DOWN, BTN_LABEL_PROP_BTN_4);
 	PROPMAP(map, MT_BUTTON_SCALE_UP, BTN_LABEL_PROP_BTN_5);
 	PROPMAP(map, MT_BUTTON_ROTATE_LEFT, BTN_LABEL_PROP_BTN_6);
 	PROPMAP(map, MT_BUTTON_ROTATE_RIGHT, BTN_LABEL_PROP_BTN_7);
 }
 #endif

 static int device_init(DeviceIntPtr dev, LocalDevicePtr local)
 {
 	struct MTouch *mt = local->private;
 	unsigned char btmap[DIM_BUTTON + 1] = {
 		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
 	};
 #if GET_ABI_MAJOR(ABI_XINPUT_VERSION) >= 7
 	Atom axes_labels[2], btn_labels[DIM_BUTTON];
 	initAxesLabels(axes_labels);
 	initButtonLabels(btn_labels);
 #endif

 	local->fd = xf86OpenSerial(local->options);
 	if (local->fd < 0) {
 		xf86Msg(X_ERROR, "multitouch: cannot open device\n");
 		return !Success;
 	}
 	if (configure_mtouch(mt, local->fd)) {
 		xf86Msg(X_ERROR, "multitouch: cannot configure device\n");
 		return !Success;
 	}
 	xf86CloseSerial(local->fd);

 #if GET_ABI_MAJOR(ABI_XINPUT_VERSION) < 3
 	InitPointerDeviceStruct((DevicePtr)dev,
 				btmap, DIM_BUTTON,
 				GetMotionHistory,
 				pointer_control,
 				GetMotionHistorySize(),
 				2);
 #elif GET_ABI_MAJOR(ABI_XINPUT_VERSION) < 7
 	InitPointerDeviceStruct((DevicePtr)dev,
 				btmap, DIM_BUTTON,
 				pointer_control,
 				GetMotionHistorySize(),
 				2);
 #elif GET_ABI_MAJOR(ABI_XINPUT_VERSION) >= 7
 	InitPointerDeviceStruct((DevicePtr)dev,
 				btmap, DIM_BUTTON, btn_labels,
 				pointer_control,
 				GetMotionHistorySize(),
 				2, axes_labels);
 #else
 #error "Unsupported ABI_XINPUT_VERSION"
 #endif

 	xf86InitValuatorAxisStruct(dev, 0,
 #if GET_ABI_MAJOR(ABI_XINPUT_VERSION) >= 7
 				   axes_labels[0],
 #endif
 				   mt->caps.abs[MTDEV_POSITION_X].minimum,
 				   mt->caps.abs[MTDEV_POSITION_X].maximum,
 #if GET_ABI_MAJOR(ABI_XINPUT_VERSION) >= 12
 				   1, 0, 1, Absolute);
 #else
 				   1, 0, 1);
 #endif
 	xf86InitValuatorDefaults(dev, 0);
 	xf86InitValuatorAxisStruct(dev, 1,
 #if GET_ABI_MAJOR(ABI_XINPUT_VERSION) >= 7
 				   axes_labels[1],
 #endif
 				   mt->caps.abs[MTDEV_POSITION_Y].minimum,
 				   mt->caps.abs[MTDEV_POSITION_Y].maximum,
 #if GET_ABI_MAJOR(ABI_XINPUT_VERSION) >= 12
 				   1, 0, 1, Absolute);
 #else
 				   1, 0, 1);
 #endif
 	xf86InitValuatorDefaults(dev, 1);

 	XIRegisterPropertyHandler(dev, pointer_property, NULL, NULL);

 	return Success;
 }

 static int device_on(LocalDevicePtr local)
 {
 	struct MTouch *mt = local->private;
 	local->fd = xf86OpenSerial(local->options);
 	if (local->fd < 0) {
 		xf86Msg(X_ERROR, "multitouch: cannot open device\n");
 		return !Success;
 	}
 	if (open_mtouch(mt, local->fd)) {
 		xf86Msg(X_ERROR, "multitouch: cannot grab device\n");
 		return !Success;
 	}
 	xf86AddEnabledDevice(local);
 	return Success;
 }

 static int device_off(LocalDevicePtr local)
 {
 	struct MTouch *mt = local->private;
 	xf86RemoveEnabledDevice(local);
 	if (close_mtouch(mt, local->fd))
 		xf86Msg(X_WARNING, "multitouch: cannot ungrab device\n");
 	xf86CloseSerial(local->fd);
 	return Success;
 }

 static int device_close(LocalDevicePtr local)
 {
 	return Success;
 }

 static void tickle_button(LocalDevicePtr local, int id)
 {
 	xf86PostButtonEvent(local->dev, FALSE, id, 1, 0, 0);
 	xf86PostButtonEvent(local->dev, FALSE, id, 0, 0, 0);
 }

 static void button_scroll(LocalDevicePtr local,
 			  int btdec, int btinc,
 			  int *scroll, int step,
 			  int delta)
 {
 	*scroll += delta;
 	while (*scroll > step) {
 		tickle_button(local, btinc);
 		*scroll -= step;
 	}
 	while (*scroll < -step) {
 		tickle_button(local, btdec);
 		*scroll += step;
 	}
 }

 static void handle_gestures(LocalDevicePtr local,
 			    const struct Gestures *gs,
 			    const struct Capabilities *caps)
 {
 	static int vscroll, hscroll, vswipe, hswipe, scale, rot;
 	int i;
 	if (!gs->same_fingers) {
 		vscroll = 0;
 		hscroll = 0;
 		vswipe = 0;
 		hswipe = 0;
 	}
 	foreach_bit(i, gs->btmask)
 		xf86PostButtonEvent(local->dev, FALSE,
 				    i + 1, GETBIT(gs->btdata, i), 0, 0);
 	if (GETBIT(gs->type, GS_MOVE))
 		xf86PostMotionEvent(local->dev, 0, 0, 2, gs->dx, gs->dy);

 	if (GETBIT(gs->type, GS_VSCROLL)) {
 		int step = 1 + vscroll_fraction * get_cap_ysize(caps);
 		button_scroll(local, 4, 5, &vscroll, step, gs->dy);
 	}
 	if (GETBIT(gs->type, GS_HSCROLL)) {
 		int step = 1 + hscroll_fraction * get_cap_xsize(caps);
 		button_scroll(local, 6, 7, &hscroll, step, gs->dx);
 	}
 	if (GETBIT(gs->type, GS_VSWIPE)) {
 		int step = 1 + vswipe_fraction * get_cap_ysize(caps);
 		button_scroll(local, 8, 9, &vswipe, step, gs->dy);
 	}
 	if (GETBIT(gs->type, GS_HSWIPE)) {
 		int step = 1 + hswipe_fraction * get_cap_xsize(caps);
 		button_scroll(local, 10, 11, &hswipe, step, gs->dx);
 	}
 	if (GETBIT(gs->type, GS_SCALE)) {
 		int step = 1 + scale_fraction * get_cap_xsize(caps);
 		button_scroll(local, 12, 13, &scale, step, gs->scale);
 	}
 	if (GETBIT(gs->type, GS_ROTATE)) {
 		int step = 1 + rot_fraction * get_cap_xsize(caps);
 		button_scroll(local, 14, 15, &rot, step, gs->rot);
 	}
 	if (GETBIT(gs->type, GS_TAP) && gs->ntap == 1) {
 		foreach_bit(i, gs->tapmask)
 			tickle_button(local, i + 1);
 	}
 	if (GETBIT(gs->type, GS_VSWIPE4)) {
 		int step = 1 + vswipe_fraction * get_cap_ysize(caps);
 		button_scroll(local, 16, 17, &vswipe, step, gs->dy);
 	}
 	if (GETBIT(gs->type, GS_HSWIPE4)) {
 		int step = 1 + hswipe_fraction * get_cap_xsize(caps);
 		button_scroll(local, 18, 19, &hswipe, step, gs->dx);
 	}
 }

 /* called for each full received packet from the touchpad */
 static void read_input(LocalDevicePtr local)
 {
 	struct Gestures gs;
 	struct MTouch *mt = local->private;
 	while (read_packet(mt, local->fd) > 0) {
 		extract_gestures(&gs, mt);
 		handle_gestures(local, &gs, &mt->caps);
 	}
 	if (has_delayed_gestures(mt, local->fd)) {
 		extract_delayed_gestures(&gs, mt);
 		handle_gestures(local, &gs, &mt->caps);
 	}
 }

 static Bool device_control(DeviceIntPtr dev, int mode)
 {
 	LocalDevicePtr local = dev->public.devicePrivate;
 	switch (mode) {
 	case DEVICE_INIT:
 		xf86Msg(X_INFO, "device control: init\n");
 		return device_init(dev, local);
 	case DEVICE_ON:
 		xf86Msg(X_INFO, "device control: on\n");
 		return device_on(local);
 	case DEVICE_OFF:
 		xf86Msg(X_INFO, "device control: off\n");
 		return device_off(local);
 	case DEVICE_CLOSE:
 		xf86Msg(X_INFO, "device control: close\n");
 		return device_close(local);
 	default:
 		xf86Msg(X_INFO, "device control: default\n");
 		return BadValue;
 	}
 }


 #if GET_ABI_MAJOR(ABI_XINPUT_VERSION) >= 12
 static int preinit(InputDriverPtr drv, InputInfoPtr pInfo, int flags)
 {
 	struct MTouch *mt;

 	mt = calloc(1, sizeof(*mt));
 	if (!mt)
 		return BadAlloc;

 	pInfo->private = mt;
 	pInfo->type_name = XI_TOUCHPAD;
 	pInfo->device_control = device_control;
 	pInfo->read_input = read_input;
 	pInfo->switch_mode = 0;
 	//xf86CollectInputOptions(local, NULL);
 	//xf86ProcessCommonOptions(local, local->options);

 	return Success;
 }
 #else
 static InputInfoPtr preinit(InputDriverPtr drv, IDevPtr dev, int flags)
 {
 	struct MTouch *mt;
 	InputInfoPtr local = xf86AllocateInput(drv, 0);
 	if (!local)
 		goto error;
 	mt = calloc(1, sizeof(struct MTouch));
 	if (!mt)
 		goto error;

 	local->name = dev->identifier;
 	local->type_name = XI_TOUCHPAD;
 	local->device_control = device_control;
 	local->read_input = read_input;
 	local->private = mt;
 	local->flags = XI86_POINTER_CAPABLE | XI86_SEND_DRAG_EVENTS;
 	local->conf_idev = dev;

 	xf86CollectInputOptions(local, NULL, NULL);
 	/* xf86OptionListReport(local->options); */
 	xf86ProcessCommonOptions(local, local->options);

 	local->flags |= XI86_CONFIGURED;
  error:
 	return local;
 }
 #endif

 static void uninit(InputDriverPtr drv, InputInfoPtr local, int flags)
 {
 	free(local->private);
 	local->private = 0;
 	xf86DeleteInput(local, 0);
 }

 _X_EXPORT InputDriverRec MULTITOUCH = {
 	1,
 	"multitouch",
 	NULL,
 	preinit,
 	uninit,
 	NULL,
 	0
 };

 static XF86ModuleVersionInfo VERSION = {
 	"multitouch",
 	MODULEVENDORSTRING,
 	MODINFOSTRING1,
 	MODINFOSTRING2,
 	XORG_VERSION_CURRENT,
 	0, 1, 0,
 	ABI_CLASS_XINPUT,
 	ABI_XINPUT_VERSION,
 	MOD_CLASS_XINPUT,
 	{0, 0, 0, 0}
 };

 static pointer setup(pointer module, pointer options, int *errmaj, int *errmin)
 {
 	xf86AddInputDriver(&MULTITOUCH, module, 0);
 	return module;
 }

 _X_EXPORT XF86ModuleData multitouchModuleData = {&VERSION, &setup, NULL };
	/***************************************************************************
	*
	* Multitouch X driver
	* Copyright (C) 2008 Henrik Rydberg <rydberg@euromail.se>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	*
	**************************************************************************/

	#include "gestures.h"

	#if GET_ABI_MAJOR(ABI_XINPUT_VERSION) >= 7
	#include <X11/Xatom.h>
	#include <xserver-properties.h>
	#endif

	#if GET_ABI_MAJOR(ABI_XINPUT_VERSION) >= 12
	typedef InputInfoPtr LocalDevicePtr;
	#endif

	/* these should be user-configurable at some point */
	static const float vscroll_fraction = 0.025;
	static const float hscroll_fraction = 0.05;
	static const float vswipe_fraction = 0.25;
	static const float hswipe_fraction = 0.25;
	static const float scale_fraction = 0.05;
	static const float rot_fraction = 0.05;

	/* button mapping simplified */
	#define PROPMAP(m, x, y) m[x] = XIGetKnownProperty(y)

	static void pointer_control(DeviceIntPtr dev, PtrCtrl *ctrl)
	{
	xf86Msg(X_INFO, "pointer_control\n");
	}

	static int pointer_property(DeviceIntPtr dev,
	Atom property,
	XIPropertyValuePtr prop,
	BOOL checkonly)
	{
	xf86Msg(X_INFO, "pointer_property\n");
	return Success;
	}

	#if GET_ABI_MAJOR(ABI_XINPUT_VERSION) >= 7
	static void initAxesLabels(Atom map[2])
	{
	memset(map, 0, 2 * sizeof(Atom));
	PROPMAP(map, 0, AXIS_LABEL_PROP_REL_X);
	PROPMAP(map, 1, AXIS_LABEL_PROP_REL_Y);
	}

	static void initButtonLabels(Atom map[DIM_BUTTON])
	{
	memset(map, 0, DIM_BUTTON * sizeof(Atom));
	PROPMAP(map, MT_BUTTON_LEFT, BTN_LABEL_PROP_BTN_LEFT);
	PROPMAP(map, MT_BUTTON_MIDDLE, BTN_LABEL_PROP_BTN_MIDDLE);
	PROPMAP(map, MT_BUTTON_RIGHT, BTN_LABEL_PROP_BTN_RIGHT);
	PROPMAP(map, MT_BUTTON_WHEEL_UP, BTN_LABEL_PROP_BTN_WHEEL_UP);
	PROPMAP(map, MT_BUTTON_WHEEL_DOWN, BTN_LABEL_PROP_BTN_WHEEL_DOWN);
	PROPMAP(map, MT_BUTTON_HWHEEL_LEFT, BTN_LABEL_PROP_BTN_HWHEEL_LEFT);
	PROPMAP(map, MT_BUTTON_HWHEEL_RIGHT, BTN_LABEL_PROP_BTN_HWHEEL_RIGHT);
	/* how to map swipe buttons? */
	PROPMAP(map, MT_BUTTON_SWIPE_UP, BTN_LABEL_PROP_BTN_0);
	PROPMAP(map, MT_BUTTON_SWIPE_DOWN, BTN_LABEL_PROP_BTN_1);
	PROPMAP(map, MT_BUTTON_SWIPE_LEFT, BTN_LABEL_PROP_BTN_2);
	PROPMAP(map, MT_BUTTON_SWIPE_RIGHT, BTN_LABEL_PROP_BTN_3);
	/* how to map scale and rotate? */
	PROPMAP(map, MT_BUTTON_SCALE_DOWN, BTN_LABEL_PROP_BTN_4);
	PROPMAP(map, MT_BUTTON_SCALE_UP, BTN_LABEL_PROP_BTN_5);
	PROPMAP(map, MT_BUTTON_ROTATE_LEFT, BTN_LABEL_PROP_BTN_6);
	PROPMAP(map, MT_BUTTON_ROTATE_RIGHT, BTN_LABEL_PROP_BTN_7);
	}
	#endif

	static int device_init(DeviceIntPtr dev, LocalDevicePtr local)
	{
	struct MTouch *mt = local->private;
	unsigned char btmap[DIM_BUTTON + 1] = {
	0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
	};
	#if GET_ABI_MAJOR(ABI_XINPUT_VERSION) >= 7
	Atom axes_labels[2], btn_labels[DIM_BUTTON];
	initAxesLabels(axes_labels);
	initButtonLabels(btn_labels);
	#endif

	local->fd = xf86OpenSerial(local->options);
	if (local->fd < 0) {
	xf86Msg(X_ERROR, "multitouch: cannot open device\n");
	return !Success;
	}
	if (configure_mtouch(mt, local->fd)) {
	xf86Msg(X_ERROR, "multitouch: cannot configure device\n");
	return !Success;
	}
	xf86CloseSerial(local->fd);

	#if GET_ABI_MAJOR(ABI_XINPUT_VERSION) < 3
	InitPointerDeviceStruct((DevicePtr)dev,
	btmap, DIM_BUTTON,
	GetMotionHistory,
	pointer_control,
	GetMotionHistorySize(),
	2);
	#elif GET_ABI_MAJOR(ABI_XINPUT_VERSION) < 7
	InitPointerDeviceStruct((DevicePtr)dev,
	btmap, DIM_BUTTON,
	pointer_control,
	GetMotionHistorySize(),
	2);
	#elif GET_ABI_MAJOR(ABI_XINPUT_VERSION) >= 7
	InitPointerDeviceStruct((DevicePtr)dev,
	btmap, DIM_BUTTON, btn_labels,
	pointer_control,
	GetMotionHistorySize(),
	2, axes_labels);
	#else
	#error "Unsupported ABI_XINPUT_VERSION"
	#endif

	xf86InitValuatorAxisStruct(dev, 0,
	#if GET_ABI_MAJOR(ABI_XINPUT_VERSION) >= 7
	axes_labels[0],
	#endif
	mt->caps.abs[MTDEV_POSITION_X].minimum,
	mt->caps.abs[MTDEV_POSITION_X].maximum,
	#if GET_ABI_MAJOR(ABI_XINPUT_VERSION) >= 12
	1, 0, 1, Absolute);
	#else
	1, 0, 1);
	#endif
	xf86InitValuatorDefaults(dev, 0);
	xf86InitValuatorAxisStruct(dev, 1,
	#if GET_ABI_MAJOR(ABI_XINPUT_VERSION) >= 7
	axes_labels[1],
	#endif
	mt->caps.abs[MTDEV_POSITION_Y].minimum,
	mt->caps.abs[MTDEV_POSITION_Y].maximum,
	#if GET_ABI_MAJOR(ABI_XINPUT_VERSION) >= 12
	1, 0, 1, Absolute);
	#else
	1, 0, 1);
	#endif
	xf86InitValuatorDefaults(dev, 1);

	XIRegisterPropertyHandler(dev, pointer_property, NULL, NULL);

	return Success;
	}

	static int device_on(LocalDevicePtr local)
	{
	struct MTouch *mt = local->private;
	local->fd = xf86OpenSerial(local->options);
	if (local->fd < 0) {
	xf86Msg(X_ERROR, "multitouch: cannot open device\n");
	return !Success;
	}
	if (open_mtouch(mt, local->fd)) {
	xf86Msg(X_ERROR, "multitouch: cannot grab device\n");
	return !Success;
	}
	xf86AddEnabledDevice(local);
	return Success;
	}

	static int device_off(LocalDevicePtr local)
	{
	struct MTouch *mt = local->private;
	xf86RemoveEnabledDevice(local);
	if (close_mtouch(mt, local->fd))
	xf86Msg(X_WARNING, "multitouch: cannot ungrab device\n");
	xf86CloseSerial(local->fd);
	return Success;
	}

	static int device_close(LocalDevicePtr local)
	{
	return Success;
	}

	static void tickle_button(LocalDevicePtr local, int id)
	{
	xf86PostButtonEvent(local->dev, FALSE, id, 1, 0, 0);
	xf86PostButtonEvent(local->dev, FALSE, id, 0, 0, 0);
	}

	static void button_scroll(LocalDevicePtr local,
	int btdec, int btinc,
	int *scroll, int step,
	int delta)
	{
	*scroll += delta;
	while (*scroll > step) {
	tickle_button(local, btinc);
	*scroll -= step;
	}
	while (*scroll < -step) {
	tickle_button(local, btdec);
	*scroll += step;
	}
	}

	static void handle_gestures(LocalDevicePtr local,
	const struct Gestures *gs,
	const struct Capabilities *caps)
	{
	static int vscroll, hscroll, vswipe, hswipe, scale, rot;
	int i;
	if (!gs->same_fingers) {
	vscroll = 0;
	hscroll = 0;
	vswipe = 0;
	hswipe = 0;
	}
	foreach_bit(i, gs->btmask)
	xf86PostButtonEvent(local->dev, FALSE,
	i + 1, GETBIT(gs->btdata, i), 0, 0);
	if (GETBIT(gs->type, GS_MOVE))
	xf86PostMotionEvent(local->dev, 0, 0, 2, gs->dx, gs->dy);

	if (GETBIT(gs->type, GS_VSCROLL)) {
	int step = 1 + vscroll_fraction * get_cap_ysize(caps);
	button_scroll(local, 4, 5, &vscroll, step, gs->dy);
	}
	if (GETBIT(gs->type, GS_HSCROLL)) {
	int step = 1 + hscroll_fraction * get_cap_xsize(caps);
	button_scroll(local, 6, 7, &hscroll, step, gs->dx);
	}
	if (GETBIT(gs->type, GS_VSWIPE)) {
	int step = 1 + vswipe_fraction * get_cap_ysize(caps);
	button_scroll(local, 8, 9, &vswipe, step, gs->dy);
	}
	if (GETBIT(gs->type, GS_HSWIPE)) {
	int step = 1 + hswipe_fraction * get_cap_xsize(caps);
	button_scroll(local, 10, 11, &hswipe, step, gs->dx);
	}
	if (GETBIT(gs->type, GS_SCALE)) {
	int step = 1 + scale_fraction * get_cap_xsize(caps);
	button_scroll(local, 12, 13, &scale, step, gs->scale);
	}
	if (GETBIT(gs->type, GS_ROTATE)) {
	int step = 1 + rot_fraction * get_cap_xsize(caps);
	button_scroll(local, 14, 15, &rot, step, gs->rot);
	}
	if (GETBIT(gs->type, GS_TAP) && gs->ntap == 1) {
	foreach_bit(i, gs->tapmask)
	tickle_button(local, i + 1);
	}
	if (GETBIT(gs->type, GS_VSWIPE4)) {
	int step = 1 + vswipe_fraction * get_cap_ysize(caps);
	button_scroll(local, 16, 17, &vswipe, step, gs->dy);
	}
	if (GETBIT(gs->type, GS_HSWIPE4)) {
	int step = 1 + hswipe_fraction * get_cap_xsize(caps);
	button_scroll(local, 18, 19, &hswipe, step, gs->dx);
	}
	}

	/* called for each full received packet from the touchpad */
	static void read_input(LocalDevicePtr local)
	{
	struct Gestures gs;
	struct MTouch *mt = local->private;
	while (read_packet(mt, local->fd) > 0) {
	extract_gestures(&gs, mt);
	handle_gestures(local, &gs, &mt->caps);
	}
	if (has_delayed_gestures(mt, local->fd)) {
	extract_delayed_gestures(&gs, mt);
	handle_gestures(local, &gs, &mt->caps);
	}
	}

	static Bool device_control(DeviceIntPtr dev, int mode)
	{
	LocalDevicePtr local = dev->public.devicePrivate;
	switch (mode) {
	case DEVICE_INIT:
	xf86Msg(X_INFO, "device control: init\n");
	return device_init(dev, local);
	case DEVICE_ON:
	xf86Msg(X_INFO, "device control: on\n");
	return device_on(local);
	case DEVICE_OFF:
	xf86Msg(X_INFO, "device control: off\n");
	return device_off(local);
	case DEVICE_CLOSE:
	xf86Msg(X_INFO, "device control: close\n");
	return device_close(local);
	default:
	xf86Msg(X_INFO, "device control: default\n");
	return BadValue;
	}
	}


	#if GET_ABI_MAJOR(ABI_XINPUT_VERSION) >= 12
	static int preinit(InputDriverPtr drv, InputInfoPtr pInfo, int flags)
	{
	struct MTouch *mt;

	mt = calloc(1, sizeof(*mt));
	if (!mt)
	return BadAlloc;

	pInfo->private = mt;
	pInfo->type_name = XI_TOUCHPAD;
	pInfo->device_control = device_control;
	pInfo->read_input = read_input;
	pInfo->switch_mode = 0;
	//xf86CollectInputOptions(local, NULL);
	//xf86ProcessCommonOptions(local, local->options);

	return Success;
	}
	#else
	static InputInfoPtr preinit(InputDriverPtr drv, IDevPtr dev, int flags)
	{
	struct MTouch *mt;
	InputInfoPtr local = xf86AllocateInput(drv, 0);
	if (!local)
	goto error;
	mt = calloc(1, sizeof(struct MTouch));
	if (!mt)
	goto error;

	local->name = dev->identifier;
	local->type_name = XI_TOUCHPAD;
	local->device_control = device_control;
	local->read_input = read_input;
	local->private = mt;
	local->flags = XI86_POINTER_CAPABLE \| XI86_SEND_DRAG_EVENTS;
	local->conf_idev = dev;

	xf86CollectInputOptions(local, NULL, NULL);
	/* xf86OptionListReport(local->options); */
	xf86ProcessCommonOptions(local, local->options);

	local->flags \|= XI86_CONFIGURED;
	error:
	return local;
	}
	#endif

	static void uninit(InputDriverPtr drv, InputInfoPtr local, int flags)
	{
	free(local->private);
	local->private = 0;
	xf86DeleteInput(local, 0);
	}

	_X_EXPORT InputDriverRec MULTITOUCH = {
	1,
	"multitouch",
	NULL,
	preinit,
	uninit,
	NULL,
	0
	};

	static XF86ModuleVersionInfo VERSION = {
	"multitouch",
	MODULEVENDORSTRING,
	MODINFOSTRING1,
	MODINFOSTRING2,
	XORG_VERSION_CURRENT,
	0, 1, 0,
	ABI_CLASS_XINPUT,
	ABI_XINPUT_VERSION,
	MOD_CLASS_XINPUT,
	{0, 0, 0, 0}
	};

	static pointer setup(pointer module, pointer options, int errmaj, int errmin)
	{
	xf86AddInputDriver(&MULTITOUCH, module, 0);
	return module;
	}

	_X_EXPORT XF86ModuleData multitouchModuleData = {&VERSION, &setup, NULL };