libinput/src/libinput.c

/*
 * Copyright © 2013 Jonas Ådahl
 * Copyright © 2013-2015 Red Hat, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include "config.h"

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/epoll.h>
#include <unistd.h>
#include <assert.h>

#include "libinput.h"
#include "libinput-private.h"
#include "evdev.h"
#include "timer.h"

#define require_event_type(li_, type_, retval_, ...)	\
	if (type_ == LIBINPUT_EVENT_NONE) abort(); \
	if (!check_event_type(li_, __func__, type_, __VA_ARGS__, -1)) \
		return retval_; \

static inline bool
check_event_type(struct libinput *libinput,
		 const char *function_name,
		 enum libinput_event_type type_in,
		 ...)
{
	bool rc = false;
	va_list args;
	unsigned int type_permitted;

	va_start(args, type_in);
	type_permitted = va_arg(args, unsigned int);

	while (type_permitted != (unsigned int)-1) {
		if (type_permitted == type_in) {
			rc = true;
			break;
		}
		type_permitted = va_arg(args, unsigned int);
	}

	va_end(args);

	if (!rc)
		log_bug_client(libinput,
			       "Invalid event type %d passed to %s()\n",
			       type_in, function_name);

	return rc;
}

struct libinput_source {
	libinput_source_dispatch_t dispatch;
	void *user_data;
	int fd;
	struct list link;
};

struct libinput_event_device_notify {
	struct libinput_event base;
};

struct libinput_event_keyboard {
	struct libinput_event base;
	uint64_t time;
	uint32_t key;
	uint32_t seat_key_count;
	enum libinput_key_state state;
};

struct libinput_event_pointer {
	struct libinput_event base;
	uint64_t time;
	struct normalized_coords delta;
	struct device_float_coords delta_raw;
	struct device_coords absolute;
	struct discrete_coords discrete;
	uint32_t button;
	uint32_t seat_button_count;
	enum libinput_button_state state;
	enum libinput_pointer_axis_source source;
	uint32_t axes;
};

struct libinput_event_touch {
	struct libinput_event base;
	uint64_t time;
	int32_t slot;
	int32_t seat_slot;
	struct device_coords point;
};

struct libinput_event_gesture {
	struct libinput_event base;
	uint64_t time;
	int finger_count;
	int cancelled;
	struct normalized_coords delta;
	struct normalized_coords delta_unaccel;
	double scale;
	double angle;
};

static void
libinput_default_log_func(struct libinput *libinput,
			  enum libinput_log_priority priority,
			  const char *format, va_list args)
{
	const char *prefix;

	switch(priority) {
	case LIBINPUT_LOG_PRIORITY_DEBUG: prefix = "debug"; break;
	case LIBINPUT_LOG_PRIORITY_INFO: prefix = "info"; break;
	case LIBINPUT_LOG_PRIORITY_ERROR: prefix = "error"; break;
	default: prefix="<invalid priority>"; break;
	}

	fprintf(stderr, "libinput %s: ", prefix);
	vfprintf(stderr, format, args);
}

void
log_msg_va(struct libinput *libinput,
	   enum libinput_log_priority priority,
	   const char *format,
	   va_list args)
{
	if (libinput->log_handler &&
	    libinput->log_priority <= priority)
		libinput->log_handler(libinput, priority, format, args);
}

void
log_msg(struct libinput *libinput,
	enum libinput_log_priority priority,
	const char *format, ...)
{
	va_list args;

	va_start(args, format);
	log_msg_va(libinput, priority, format, args);
	va_end(args);
}

void
log_msg_ratelimit(struct libinput *libinput,
		  struct ratelimit *ratelimit,
		  enum libinput_log_priority priority,
		  const char *format, ...)
{
	va_list args;
	enum ratelimit_state state;

	state = ratelimit_test(ratelimit);
	if (state == RATELIMIT_EXCEEDED)
		return;

	va_start(args, format);
	log_msg_va(libinput, priority, format, args);
	va_end(args);

	if (state == RATELIMIT_THRESHOLD)
		log_msg(libinput,
			priority,
			"WARNING: log rate limit exceeded (%d msgs per %dms). Discarding future messages.\n",
			ratelimit->burst,
			us2ms(ratelimit->interval));
}

LIBINPUT_EXPORT void
libinput_log_set_priority(struct libinput *libinput,
			  enum libinput_log_priority priority)
{
	libinput->log_priority = priority;
}

LIBINPUT_EXPORT enum libinput_log_priority
libinput_log_get_priority(const struct libinput *libinput)
{
	return libinput->log_priority;
}

LIBINPUT_EXPORT void
libinput_log_set_handler(struct libinput *libinput,
			 libinput_log_handler log_handler)
{
	libinput->log_handler = log_handler;
}

static void
libinput_device_group_destroy(struct libinput_device_group *group);

static void
libinput_post_event(struct libinput *libinput,
		    struct libinput_event *event);

LIBINPUT_EXPORT enum libinput_event_type
libinput_event_get_type(struct libinput_event *event)
{
	return event->type;
}

LIBINPUT_EXPORT struct libinput *
libinput_event_get_context(struct libinput_event *event)
{
	return event->device->seat->libinput;
}

LIBINPUT_EXPORT struct libinput_device *
libinput_event_get_device(struct libinput_event *event)
{
	return event->device;
}

LIBINPUT_EXPORT struct libinput_event_pointer *
libinput_event_get_pointer_event(struct libinput_event *event)
{
	require_event_type(libinput_event_get_context(event),
			   event->type,
			   NULL,
			   LIBINPUT_EVENT_POINTER_MOTION,
			   LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE,
			   LIBINPUT_EVENT_POINTER_BUTTON,
			   LIBINPUT_EVENT_POINTER_AXIS);

	return (struct libinput_event_pointer *) event;
}

LIBINPUT_EXPORT struct libinput_event_keyboard *
libinput_event_get_keyboard_event(struct libinput_event *event)
{
	require_event_type(libinput_event_get_context(event),
			   event->type,
			   NULL,
			   LIBINPUT_EVENT_KEYBOARD_KEY);

	return (struct libinput_event_keyboard *) event;
}

LIBINPUT_EXPORT struct libinput_event_touch *
libinput_event_get_touch_event(struct libinput_event *event)
{
	require_event_type(libinput_event_get_context(event),
			   event->type,
			   NULL,
			   LIBINPUT_EVENT_TOUCH_DOWN,
			   LIBINPUT_EVENT_TOUCH_UP,
			   LIBINPUT_EVENT_TOUCH_MOTION,
			   LIBINPUT_EVENT_TOUCH_CANCEL,
			   LIBINPUT_EVENT_TOUCH_FRAME);

	return (struct libinput_event_touch *) event;
}

LIBINPUT_EXPORT struct libinput_event_gesture *
libinput_event_get_gesture_event(struct libinput_event *event)
{
	require_event_type(libinput_event_get_context(event),
			   event->type,
			   NULL,
			   LIBINPUT_EVENT_GESTURE_SWIPE_BEGIN,
			   LIBINPUT_EVENT_GESTURE_SWIPE_UPDATE,
			   LIBINPUT_EVENT_GESTURE_SWIPE_END,
			   LIBINPUT_EVENT_GESTURE_PINCH_BEGIN,
			   LIBINPUT_EVENT_GESTURE_PINCH_UPDATE,
			   LIBINPUT_EVENT_GESTURE_PINCH_END);

	return (struct libinput_event_gesture *) event;
}

LIBINPUT_EXPORT struct libinput_event_device_notify *
libinput_event_get_device_notify_event(struct libinput_event *event)
{
	require_event_type(libinput_event_get_context(event),
			   event->type,
			   NULL,
			   LIBINPUT_EVENT_DEVICE_ADDED,
			   LIBINPUT_EVENT_DEVICE_REMOVED);

	return (struct libinput_event_device_notify *) event;
}

LIBINPUT_EXPORT uint32_t
libinput_event_keyboard_get_time(struct libinput_event_keyboard *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_KEYBOARD_KEY);

	return us2ms(event->time);
}

LIBINPUT_EXPORT uint64_t
libinput_event_keyboard_get_time_usec(struct libinput_event_keyboard *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_KEYBOARD_KEY);

	return event->time;
}

LIBINPUT_EXPORT uint32_t
libinput_event_keyboard_get_key(struct libinput_event_keyboard *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_KEYBOARD_KEY);

	return event->key;
}

LIBINPUT_EXPORT enum libinput_key_state
libinput_event_keyboard_get_key_state(struct libinput_event_keyboard *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_KEYBOARD_KEY);

	return event->state;
}

LIBINPUT_EXPORT uint32_t
libinput_event_keyboard_get_seat_key_count(
	struct libinput_event_keyboard *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_KEYBOARD_KEY);

	return event->seat_key_count;
}

LIBINPUT_EXPORT uint32_t
libinput_event_pointer_get_time(struct libinput_event_pointer *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_POINTER_MOTION,
			   LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE,
			   LIBINPUT_EVENT_POINTER_BUTTON,
			   LIBINPUT_EVENT_POINTER_AXIS);

	return us2ms(event->time);
}

LIBINPUT_EXPORT uint64_t
libinput_event_pointer_get_time_usec(struct libinput_event_pointer *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_POINTER_MOTION,
			   LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE,
			   LIBINPUT_EVENT_POINTER_BUTTON,
			   LIBINPUT_EVENT_POINTER_AXIS);

	return event->time;
}

LIBINPUT_EXPORT double
libinput_event_pointer_get_dx(struct libinput_event_pointer *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_POINTER_MOTION);

	return event->delta.x;
}

LIBINPUT_EXPORT double
libinput_event_pointer_get_dy(struct libinput_event_pointer *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_POINTER_MOTION);

	return event->delta.y;
}

LIBINPUT_EXPORT double
libinput_event_pointer_get_dx_unaccelerated(
	struct libinput_event_pointer *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_POINTER_MOTION);

	return event->delta_raw.x;
}

LIBINPUT_EXPORT double
libinput_event_pointer_get_dy_unaccelerated(
	struct libinput_event_pointer *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_POINTER_MOTION);

	return event->delta_raw.y;
}

LIBINPUT_EXPORT double
libinput_event_pointer_get_absolute_x(struct libinput_event_pointer *event)
{
	struct evdev_device *device =
		(struct evdev_device *) event->base.device;

	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE);

	return evdev_convert_to_mm(device->abs.absinfo_x, event->absolute.x);
}

LIBINPUT_EXPORT double
libinput_event_pointer_get_absolute_y(struct libinput_event_pointer *event)
{
	struct evdev_device *device =
		(struct evdev_device *) event->base.device;

	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE);

	return evdev_convert_to_mm(device->abs.absinfo_y, event->absolute.y);
}

LIBINPUT_EXPORT double
libinput_event_pointer_get_absolute_x_transformed(
	struct libinput_event_pointer *event,
	uint32_t width)
{
	struct evdev_device *device =
		(struct evdev_device *) event->base.device;

	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE);

	return evdev_device_transform_x(device, event->absolute.x, width);
}

LIBINPUT_EXPORT double
libinput_event_pointer_get_absolute_y_transformed(
	struct libinput_event_pointer *event,
	uint32_t height)
{
	struct evdev_device *device =
		(struct evdev_device *) event->base.device;

	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE);

	return evdev_device_transform_y(device, event->absolute.y, height);
}

LIBINPUT_EXPORT uint32_t
libinput_event_pointer_get_button(struct libinput_event_pointer *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_POINTER_BUTTON);

	return event->button;
}

LIBINPUT_EXPORT enum libinput_button_state
libinput_event_pointer_get_button_state(struct libinput_event_pointer *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_POINTER_BUTTON);

	return event->state;
}

LIBINPUT_EXPORT uint32_t
libinput_event_pointer_get_seat_button_count(
	struct libinput_event_pointer *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_POINTER_BUTTON);

	return event->seat_button_count;
}

LIBINPUT_EXPORT int
libinput_event_pointer_has_axis(struct libinput_event_pointer *event,
				enum libinput_pointer_axis axis)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_POINTER_AXIS);

	switch (axis) {
	case LIBINPUT_POINTER_AXIS_SCROLL_HORIZONTAL:
	case LIBINPUT_POINTER_AXIS_SCROLL_VERTICAL:
		return !!(event->axes & AS_MASK(axis));
	}

	return 0;
}

LIBINPUT_EXPORT double
libinput_event_pointer_get_axis_value(struct libinput_event_pointer *event,
				      enum libinput_pointer_axis axis)
{
	struct libinput *libinput = event->base.device->seat->libinput;
	double value = 0;

	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0.0,
			   LIBINPUT_EVENT_POINTER_AXIS);

	if (!libinput_event_pointer_has_axis(event, axis)) {
		log_bug_client(libinput, "value requested for unset axis\n");
	} else {
		switch (axis) {
		case LIBINPUT_POINTER_AXIS_SCROLL_HORIZONTAL:
			value = event->delta.x;
			break;
		case LIBINPUT_POINTER_AXIS_SCROLL_VERTICAL:
			value = event->delta.y;
			break;
		}
	}

	return value;
}

LIBINPUT_EXPORT double
libinput_event_pointer_get_axis_value_discrete(struct libinput_event_pointer *event,
					       enum libinput_pointer_axis axis)
{
	struct libinput *libinput = event->base.device->seat->libinput;
	double value = 0;

	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0.0,
			   LIBINPUT_EVENT_POINTER_AXIS);

	if (!libinput_event_pointer_has_axis(event, axis)) {
		log_bug_client(libinput, "value requested for unset axis\n");
	} else {
		switch (axis) {
		case LIBINPUT_POINTER_AXIS_SCROLL_HORIZONTAL:
			value = event->discrete.x;
			break;
		case LIBINPUT_POINTER_AXIS_SCROLL_VERTICAL:
			value = event->discrete.y;
			break;
		}
	}
	return value;
}

LIBINPUT_EXPORT enum libinput_pointer_axis_source
libinput_event_pointer_get_axis_source(struct libinput_event_pointer *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_POINTER_AXIS);

	return event->source;
}

LIBINPUT_EXPORT uint32_t
libinput_event_touch_get_time(struct libinput_event_touch *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_TOUCH_DOWN,
			   LIBINPUT_EVENT_TOUCH_UP,
			   LIBINPUT_EVENT_TOUCH_MOTION,
			   LIBINPUT_EVENT_TOUCH_CANCEL,
			   LIBINPUT_EVENT_TOUCH_FRAME);

	return us2ms(event->time);
}

LIBINPUT_EXPORT uint64_t
libinput_event_touch_get_time_usec(struct libinput_event_touch *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_TOUCH_DOWN,
			   LIBINPUT_EVENT_TOUCH_UP,
			   LIBINPUT_EVENT_TOUCH_MOTION,
			   LIBINPUT_EVENT_TOUCH_CANCEL,
			   LIBINPUT_EVENT_TOUCH_FRAME);

	return event->time;
}

LIBINPUT_EXPORT int32_t
libinput_event_touch_get_slot(struct libinput_event_touch *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_TOUCH_DOWN,
			   LIBINPUT_EVENT_TOUCH_UP,
			   LIBINPUT_EVENT_TOUCH_MOTION,
			   LIBINPUT_EVENT_TOUCH_CANCEL);

	return event->slot;
}

LIBINPUT_EXPORT int32_t
libinput_event_touch_get_seat_slot(struct libinput_event_touch *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_TOUCH_DOWN,
			   LIBINPUT_EVENT_TOUCH_UP,
			   LIBINPUT_EVENT_TOUCH_MOTION,
			   LIBINPUT_EVENT_TOUCH_CANCEL);

	return event->seat_slot;
}

LIBINPUT_EXPORT double
libinput_event_touch_get_x(struct libinput_event_touch *event)
{
	struct evdev_device *device =
		(struct evdev_device *) event->base.device;

	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_TOUCH_DOWN,
			   LIBINPUT_EVENT_TOUCH_MOTION);

	return evdev_convert_to_mm(device->abs.absinfo_x, event->point.x);
}

LIBINPUT_EXPORT double
libinput_event_touch_get_x_transformed(struct libinput_event_touch *event,
				       uint32_t width)
{
	struct evdev_device *device =
		(struct evdev_device *) event->base.device;

	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_TOUCH_DOWN,
			   LIBINPUT_EVENT_TOUCH_MOTION);

	return evdev_device_transform_x(device, event->point.x, width);
}

LIBINPUT_EXPORT double
libinput_event_touch_get_y_transformed(struct libinput_event_touch *event,
				       uint32_t height)
{
	struct evdev_device *device =
		(struct evdev_device *) event->base.device;

	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_TOUCH_DOWN,
			   LIBINPUT_EVENT_TOUCH_MOTION);

	return evdev_device_transform_y(device, event->point.y, height);
}

LIBINPUT_EXPORT double
libinput_event_touch_get_y(struct libinput_event_touch *event)
{
	struct evdev_device *device =
		(struct evdev_device *) event->base.device;

	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_TOUCH_DOWN,
			   LIBINPUT_EVENT_TOUCH_MOTION);

	return evdev_convert_to_mm(device->abs.absinfo_y, event->point.y);
}

LIBINPUT_EXPORT uint32_t
libinput_event_gesture_get_time(struct libinput_event_gesture *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_GESTURE_PINCH_BEGIN,
			   LIBINPUT_EVENT_GESTURE_PINCH_UPDATE,
			   LIBINPUT_EVENT_GESTURE_PINCH_END,
			   LIBINPUT_EVENT_GESTURE_SWIPE_BEGIN,
			   LIBINPUT_EVENT_GESTURE_SWIPE_UPDATE,
			   LIBINPUT_EVENT_GESTURE_SWIPE_END);

	return us2ms(event->time);
}

LIBINPUT_EXPORT uint64_t
libinput_event_gesture_get_time_usec(struct libinput_event_gesture *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_GESTURE_PINCH_BEGIN,
			   LIBINPUT_EVENT_GESTURE_PINCH_UPDATE,
			   LIBINPUT_EVENT_GESTURE_PINCH_END,
			   LIBINPUT_EVENT_GESTURE_SWIPE_BEGIN,
			   LIBINPUT_EVENT_GESTURE_SWIPE_UPDATE,
			   LIBINPUT_EVENT_GESTURE_SWIPE_END);

	return event->time;
}

LIBINPUT_EXPORT int
libinput_event_gesture_get_finger_count(struct libinput_event_gesture *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_GESTURE_PINCH_BEGIN,
			   LIBINPUT_EVENT_GESTURE_PINCH_UPDATE,
			   LIBINPUT_EVENT_GESTURE_PINCH_END,
			   LIBINPUT_EVENT_GESTURE_SWIPE_BEGIN,
			   LIBINPUT_EVENT_GESTURE_SWIPE_UPDATE,
			   LIBINPUT_EVENT_GESTURE_SWIPE_END);

	return event->finger_count;
}

LIBINPUT_EXPORT int
libinput_event_gesture_get_cancelled(struct libinput_event_gesture *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0,
			   LIBINPUT_EVENT_GESTURE_PINCH_END,
			   LIBINPUT_EVENT_GESTURE_SWIPE_END);

	return event->cancelled;
}

LIBINPUT_EXPORT double
libinput_event_gesture_get_dx(struct libinput_event_gesture *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0.0,
			   LIBINPUT_EVENT_GESTURE_PINCH_BEGIN,
			   LIBINPUT_EVENT_GESTURE_PINCH_UPDATE,
			   LIBINPUT_EVENT_GESTURE_PINCH_END,
			   LIBINPUT_EVENT_GESTURE_SWIPE_BEGIN,
			   LIBINPUT_EVENT_GESTURE_SWIPE_UPDATE,
			   LIBINPUT_EVENT_GESTURE_SWIPE_END);

	return event->delta.x;
}

LIBINPUT_EXPORT double
libinput_event_gesture_get_dy(struct libinput_event_gesture *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0.0,
			   LIBINPUT_EVENT_GESTURE_PINCH_BEGIN,
			   LIBINPUT_EVENT_GESTURE_PINCH_UPDATE,
			   LIBINPUT_EVENT_GESTURE_PINCH_END,
			   LIBINPUT_EVENT_GESTURE_SWIPE_BEGIN,
			   LIBINPUT_EVENT_GESTURE_SWIPE_UPDATE,
			   LIBINPUT_EVENT_GESTURE_SWIPE_END);

	return event->delta.y;
}

LIBINPUT_EXPORT double
libinput_event_gesture_get_dx_unaccelerated(
	struct libinput_event_gesture *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0.0,
			   LIBINPUT_EVENT_GESTURE_PINCH_BEGIN,
			   LIBINPUT_EVENT_GESTURE_PINCH_UPDATE,
			   LIBINPUT_EVENT_GESTURE_PINCH_END,
			   LIBINPUT_EVENT_GESTURE_SWIPE_BEGIN,
			   LIBINPUT_EVENT_GESTURE_SWIPE_UPDATE,
			   LIBINPUT_EVENT_GESTURE_SWIPE_END);

	return event->delta_unaccel.x;
}

LIBINPUT_EXPORT double
libinput_event_gesture_get_dy_unaccelerated(
	struct libinput_event_gesture *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0.0,
			   LIBINPUT_EVENT_GESTURE_PINCH_BEGIN,
			   LIBINPUT_EVENT_GESTURE_PINCH_UPDATE,
			   LIBINPUT_EVENT_GESTURE_PINCH_END,
			   LIBINPUT_EVENT_GESTURE_SWIPE_BEGIN,
			   LIBINPUT_EVENT_GESTURE_SWIPE_UPDATE,
			   LIBINPUT_EVENT_GESTURE_SWIPE_END);

	return event->delta_unaccel.y;
}

LIBINPUT_EXPORT double
libinput_event_gesture_get_scale(struct libinput_event_gesture *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0.0,
			   LIBINPUT_EVENT_GESTURE_PINCH_BEGIN,
			   LIBINPUT_EVENT_GESTURE_PINCH_UPDATE,
			   LIBINPUT_EVENT_GESTURE_PINCH_END);

	return event->scale;
}

LIBINPUT_EXPORT double
libinput_event_gesture_get_angle_delta(struct libinput_event_gesture *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   0.0,
			   LIBINPUT_EVENT_GESTURE_PINCH_BEGIN,
			   LIBINPUT_EVENT_GESTURE_PINCH_UPDATE,
			   LIBINPUT_EVENT_GESTURE_PINCH_END);

	return event->angle;
}

struct libinput_source *
libinput_add_fd(struct libinput *libinput,
		int fd,
		libinput_source_dispatch_t dispatch,
		void *user_data)
{
	struct libinput_source *source;
	struct epoll_event ep;

	source = zalloc(sizeof *source);
	if (!source)
		return NULL;

	source->dispatch = dispatch;
	source->user_data = user_data;
	source->fd = fd;

	memset(&ep, 0, sizeof ep);
	ep.events = EPOLLIN;
	ep.data.ptr = source;

	if (epoll_ctl(libinput->epoll_fd, EPOLL_CTL_ADD, fd, &ep) < 0) {
		free(source);
		return NULL;
	}

	return source;
}

void
libinput_remove_source(struct libinput *libinput,
		       struct libinput_source *source)
{
	epoll_ctl(libinput->epoll_fd, EPOLL_CTL_DEL, source->fd, NULL);
	source->fd = -1;
	list_insert(&libinput->source_destroy_list, &source->link);
}

int
libinput_init(struct libinput *libinput,
	      const struct libinput_interface *interface,
	      const struct libinput_interface_backend *interface_backend,
	      void *user_data)
{
	libinput->epoll_fd = epoll_create1(EPOLL_CLOEXEC);;
	if (libinput->epoll_fd < 0)
		return -1;

	libinput->events_len = 4;
	libinput->events = zalloc(libinput->events_len * sizeof(*libinput->events));
	if (!libinput->events) {
		close(libinput->epoll_fd);
		return -1;
	}

	libinput->log_handler = libinput_default_log_func;
	libinput->log_priority = LIBINPUT_LOG_PRIORITY_ERROR;
	libinput->interface = interface;
	libinput->interface_backend = interface_backend;
	libinput->user_data = user_data;
	libinput->refcount = 1;
	list_init(&libinput->source_destroy_list);
	list_init(&libinput->seat_list);
	list_init(&libinput->device_group_list);

	if (libinput_timer_subsys_init(libinput) != 0) {
		free(libinput->events);
		close(libinput->epoll_fd);
		return -1;
	}

	return 0;
}

static void
libinput_device_destroy(struct libinput_device *device);

static void
libinput_seat_destroy(struct libinput_seat *seat);

static void
libinput_drop_destroyed_sources(struct libinput *libinput)
{
	struct libinput_source *source, *next;

	list_for_each_safe(source, next, &libinput->source_destroy_list, link)
		free(source);
	list_init(&libinput->source_destroy_list);
}

LIBINPUT_EXPORT struct libinput *
libinput_ref(struct libinput *libinput)
{
	libinput->refcount++;
	return libinput;
}

LIBINPUT_EXPORT struct libinput *
libinput_unref(struct libinput *libinput)
{
	struct libinput_event *event;
	struct libinput_device *device, *next_device;
	struct libinput_seat *seat, *next_seat;
	struct libinput_device_group *group, *next_group;

	if (libinput == NULL)
		return NULL;

	assert(libinput->refcount > 0);
	libinput->refcount--;
	if (libinput->refcount > 0)
		return libinput;

	libinput_suspend(libinput);

	libinput->interface_backend->destroy(libinput);

	while ((event = libinput_get_event(libinput)))
	       libinput_event_destroy(event);

	free(libinput->events);

	list_for_each_safe(seat, next_seat, &libinput->seat_list, link) {
		list_for_each_safe(device, next_device,
				   &seat->devices_list,
				   link)
			libinput_device_destroy(device);

		libinput_seat_destroy(seat);
	}

	list_for_each_safe(group,
			   next_group,
			   &libinput->device_group_list,
			   link) {
		libinput_device_group_destroy(group);
	}

	libinput_timer_subsys_destroy(libinput);
	libinput_drop_destroyed_sources(libinput);
	close(libinput->epoll_fd);
	free(libinput);

	return NULL;
}

LIBINPUT_EXPORT void
libinput_event_destroy(struct libinput_event *event)
{
	if (event == NULL)
		return;

	if (event->device)
		libinput_device_unref(event->device);

	free(event);
}

int
open_restricted(struct libinput *libinput,
		const char *path, int flags)
{
	return libinput->interface->open_restricted(path,
						    flags,
						    libinput->user_data);
}

void
close_restricted(struct libinput *libinput, int fd)
{
	return libinput->interface->close_restricted(fd, libinput->user_data);
}

bool
ignore_litest_test_suite_device(struct udev_device *device)
{
	if (!getenv("LIBINPUT_RUNNING_TEST_SUITE") &&
	    udev_device_get_property_value(device, "LIBINPUT_TEST_DEVICE"))
		return true;

	return false;
}

void
libinput_seat_init(struct libinput_seat *seat,
		   struct libinput *libinput,
		   const char *physical_name,
		   const char *logical_name,
		   libinput_seat_destroy_func destroy)
{
	seat->refcount = 1;
	seat->libinput = libinput;
	seat->physical_name = strdup(physical_name);
	seat->logical_name = strdup(logical_name);
	seat->destroy = destroy;
	list_init(&seat->devices_list);
	list_insert(&libinput->seat_list, &seat->link);
}

LIBINPUT_EXPORT struct libinput_seat *
libinput_seat_ref(struct libinput_seat *seat)
{
	seat->refcount++;
	return seat;
}

static void
libinput_seat_destroy(struct libinput_seat *seat)
{
	list_remove(&seat->link);
	free(seat->logical_name);
	free(seat->physical_name);
	seat->destroy(seat);
}

LIBINPUT_EXPORT struct libinput_seat *
libinput_seat_unref(struct libinput_seat *seat)
{
	assert(seat->refcount > 0);
	seat->refcount--;
	if (seat->refcount == 0) {
		libinput_seat_destroy(seat);
		return NULL;
	} else {
		return seat;
	}
}

LIBINPUT_EXPORT void
libinput_seat_set_user_data(struct libinput_seat *seat, void *user_data)
{
	seat->user_data = user_data;
}

LIBINPUT_EXPORT void *
libinput_seat_get_user_data(struct libinput_seat *seat)
{
	return seat->user_data;
}

LIBINPUT_EXPORT struct libinput *
libinput_seat_get_context(struct libinput_seat *seat)
{
	return seat->libinput;
}

LIBINPUT_EXPORT const char *
libinput_seat_get_physical_name(struct libinput_seat *seat)
{
	return seat->physical_name;
}

LIBINPUT_EXPORT const char *
libinput_seat_get_logical_name(struct libinput_seat *seat)
{
	return seat->logical_name;
}

void
libinput_device_init(struct libinput_device *device,
		     struct libinput_seat *seat)
{
	device->seat = seat;
	device->refcount = 1;
	list_init(&device->event_listeners);
}

LIBINPUT_EXPORT struct libinput_device *
libinput_device_ref(struct libinput_device *device)
{
	device->refcount++;
	return device;
}

static void
libinput_device_destroy(struct libinput_device *device)
{
	assert(list_empty(&device->event_listeners));
	evdev_device_destroy((struct evdev_device *) device);
}

LIBINPUT_EXPORT struct libinput_device *
libinput_device_unref(struct libinput_device *device)
{
	assert(device->refcount > 0);
	device->refcount--;
	if (device->refcount == 0) {
		libinput_device_destroy(device);
		return NULL;
	} else {
		return device;
	}
}

LIBINPUT_EXPORT int
libinput_get_fd(struct libinput *libinput)
{
	return libinput->epoll_fd;
}

LIBINPUT_EXPORT int
libinput_dispatch(struct libinput *libinput)
{
	struct libinput_source *source;
	struct epoll_event ep[32];
	int i, count;

	count = epoll_wait(libinput->epoll_fd, ep, ARRAY_LENGTH(ep), 0);
	if (count < 0)
		return -errno;

	for (i = 0; i < count; ++i) {
		source = ep[i].data.ptr;
		if (source->fd == -1)
			continue;

		source->dispatch(source->user_data);
	}

	libinput_drop_destroyed_sources(libinput);

	return 0;
}

void
libinput_device_add_event_listener(struct libinput_device *device,
				   struct libinput_event_listener *listener,
				   void (*notify_func)(
						uint64_t time,
						struct libinput_event *event,
						void *notify_func_data),
				   void *notify_func_data)
{
	listener->notify_func = notify_func;
	listener->notify_func_data = notify_func_data;
	list_insert(&device->event_listeners, &listener->link);
}

void
libinput_device_remove_event_listener(struct libinput_event_listener *listener)
{
	list_remove(&listener->link);
}

static uint32_t
update_seat_key_count(struct libinput_seat *seat,
		      int32_t key,
		      enum libinput_key_state state)
{
	assert(key >= 0 && key <= KEY_MAX);

	switch (state) {
	case LIBINPUT_KEY_STATE_PRESSED:
		return ++seat->button_count[key];
	case LIBINPUT_KEY_STATE_RELEASED:
		/* We might not have received the first PRESSED event. */
		if (seat->button_count[key] == 0)
			return 0;

		return --seat->button_count[key];
	}

	return 0;
}

static uint32_t
update_seat_button_count(struct libinput_seat *seat,
			 int32_t button,
			 enum libinput_button_state state)
{
	assert(button >= 0 && button <= KEY_MAX);

	switch (state) {
	case LIBINPUT_BUTTON_STATE_PRESSED:
		return ++seat->button_count[button];
	case LIBINPUT_BUTTON_STATE_RELEASED:
		/* We might not have received the first PRESSED event. */
		if (seat->button_count[button] == 0)
			return 0;

		return --seat->button_count[button];
	}

	return 0;
}

static void
init_event_base(struct libinput_event *event,
		struct libinput_device *device,
		enum libinput_event_type type)
{
	event->type = type;
	event->device = device;
}

static void
post_base_event(struct libinput_device *device,
		enum libinput_event_type type,
		struct libinput_event *event)
{
	struct libinput *libinput = device->seat->libinput;
	init_event_base(event, device, type);
	libinput_post_event(libinput, event);
}

static void
post_device_event(struct libinput_device *device,
		  uint64_t time,
		  enum libinput_event_type type,
		  struct libinput_event *event)
{
	struct libinput_event_listener *listener, *tmp;

	init_event_base(event, device, type);

	list_for_each_safe(listener, tmp, &device->event_listeners, link)
		listener->notify_func(time, event, listener->notify_func_data);

	libinput_post_event(device->seat->libinput, event);
}

void
notify_added_device(struct libinput_device *device)
{
	struct libinput_event_device_notify *added_device_event;

	added_device_event = zalloc(sizeof *added_device_event);
	if (!added_device_event)
		return;

	post_base_event(device,
			LIBINPUT_EVENT_DEVICE_ADDED,
			&added_device_event->base);
}

void
notify_removed_device(struct libinput_device *device)
{
	struct libinput_event_device_notify *removed_device_event;

	removed_device_event = zalloc(sizeof *removed_device_event);
	if (!removed_device_event)
		return;

	post_base_event(device,
			LIBINPUT_EVENT_DEVICE_REMOVED,
			&removed_device_event->base);
}

static inline bool
device_has_cap(struct libinput_device *device,
	       enum libinput_device_capability cap)
{
	const char *capability;

	if (libinput_device_has_capability(device, cap))
		return true;

	switch (cap) {
	case LIBINPUT_DEVICE_CAP_POINTER:
		capability = "CAP_POINTER";
		break;
	case LIBINPUT_DEVICE_CAP_KEYBOARD:
		capability = "CAP_KEYBOARD";
		break;
	case LIBINPUT_DEVICE_CAP_TOUCH:
		capability = "CAP_TOUCH";
		break;
	case LIBINPUT_DEVICE_CAP_GESTURE:
		capability = "CAP_GESTURE";
		break;
	}

	log_bug_libinput(device->seat->libinput,
			 "Event for missing capability %s on device \"%s\"\n",
			 capability,
			 libinput_device_get_name(device));

	return false;
}

void
keyboard_notify_key(struct libinput_device *device,
		    uint64_t time,
		    uint32_t key,
		    enum libinput_key_state state)
{
	struct libinput_event_keyboard *key_event;
	uint32_t seat_key_count;

	if (!device_has_cap(device, LIBINPUT_DEVICE_CAP_KEYBOARD))
		return;

	key_event = zalloc(sizeof *key_event);
	if (!key_event)
		return;

	seat_key_count = update_seat_key_count(device->seat, key, state);

	*key_event = (struct libinput_event_keyboard) {
		.time = time,
		.key = key,
		.state = state,
		.seat_key_count = seat_key_count,
	};

	post_device_event(device, time,
			  LIBINPUT_EVENT_KEYBOARD_KEY,
			  &key_event->base);
}

void
pointer_notify_motion(struct libinput_device *device,
		      uint64_t time,
		      const struct normalized_coords *delta,
		      const struct device_float_coords *raw)
{
	struct libinput_event_pointer *motion_event;

	if (!device_has_cap(device, LIBINPUT_DEVICE_CAP_POINTER))
		return;

	motion_event = zalloc(sizeof *motion_event);
	if (!motion_event)
		return;

	*motion_event = (struct libinput_event_pointer) {
		.time = time,
		.delta = *delta,
		.delta_raw = *raw,
	};

	post_device_event(device, time,
			  LIBINPUT_EVENT_POINTER_MOTION,
			  &motion_event->base);
}

void
pointer_notify_motion_absolute(struct libinput_device *device,
			       uint64_t time,
			       const struct device_coords *point)
{
	struct libinput_event_pointer *motion_absolute_event;

	if (!device_has_cap(device, LIBINPUT_DEVICE_CAP_POINTER))
		return;

	motion_absolute_event = zalloc(sizeof *motion_absolute_event);
	if (!motion_absolute_event)
		return;

	*motion_absolute_event = (struct libinput_event_pointer) {
		.time = time,
		.absolute = *point,
	};

	post_device_event(device, time,
			  LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE,
			  &motion_absolute_event->base);
}

void
pointer_notify_button(struct libinput_device *device,
		      uint64_t time,
		      int32_t button,
		      enum libinput_button_state state)
{
	struct libinput_event_pointer *button_event;
	int32_t seat_button_count;

	if (!device_has_cap(device, LIBINPUT_DEVICE_CAP_POINTER))
		return;

	button_event = zalloc(sizeof *button_event);
	if (!button_event)
		return;

	seat_button_count = update_seat_button_count(device->seat,
						     button,
						     state);

	*button_event = (struct libinput_event_pointer) {
		.time = time,
		.button = button,
		.state = state,
		.seat_button_count = seat_button_count,
	};

	post_device_event(device, time,
			  LIBINPUT_EVENT_POINTER_BUTTON,
			  &button_event->base);
}

void
pointer_notify_axis(struct libinput_device *device,
		    uint64_t time,
		    uint32_t axes,
		    enum libinput_pointer_axis_source source,
		    const struct normalized_coords *delta,
		    const struct discrete_coords *discrete)
{
	struct libinput_event_pointer *axis_event;

	if (!device_has_cap(device, LIBINPUT_DEVICE_CAP_POINTER))
		return;

	axis_event = zalloc(sizeof *axis_event);
	if (!axis_event)
		return;

	*axis_event = (struct libinput_event_pointer) {
		.time = time,
		.delta = *delta,
		.source = source,
		.axes = axes,
		.discrete = *discrete,
	};

	post_device_event(device, time,
			  LIBINPUT_EVENT_POINTER_AXIS,
			  &axis_event->base);
}

void
touch_notify_touch_down(struct libinput_device *device,
			uint64_t time,
			int32_t slot,
			int32_t seat_slot,
			const struct device_coords *point)
{
	struct libinput_event_touch *touch_event;

	if (!device_has_cap(device, LIBINPUT_DEVICE_CAP_TOUCH))
		return;

	touch_event = zalloc(sizeof *touch_event);
	if (!touch_event)
		return;

	*touch_event = (struct libinput_event_touch) {
		.time = time,
		.slot = slot,
		.seat_slot = seat_slot,
		.point = *point,
	};

	post_device_event(device, time,
			  LIBINPUT_EVENT_TOUCH_DOWN,
			  &touch_event->base);
}

void
touch_notify_touch_motion(struct libinput_device *device,
			  uint64_t time,
			  int32_t slot,
			  int32_t seat_slot,
			  const struct device_coords *point)
{
	struct libinput_event_touch *touch_event;

	if (!device_has_cap(device, LIBINPUT_DEVICE_CAP_TOUCH))
		return;

	touch_event = zalloc(sizeof *touch_event);
	if (!touch_event)
		return;

	*touch_event = (struct libinput_event_touch) {
		.time = time,
		.slot = slot,
		.seat_slot = seat_slot,
		.point = *point,
	};

	post_device_event(device, time,
			  LIBINPUT_EVENT_TOUCH_MOTION,
			  &touch_event->base);
}

void
touch_notify_touch_up(struct libinput_device *device,
		      uint64_t time,
		      int32_t slot,
		      int32_t seat_slot)
{
	struct libinput_event_touch *touch_event;

	if (!device_has_cap(device, LIBINPUT_DEVICE_CAP_TOUCH))
		return;

	touch_event = zalloc(sizeof *touch_event);
	if (!touch_event)
		return;

	*touch_event = (struct libinput_event_touch) {
		.time = time,
		.slot = slot,
		.seat_slot = seat_slot,
	};

	post_device_event(device, time,
			  LIBINPUT_EVENT_TOUCH_UP,
			  &touch_event->base);
}

void
touch_notify_frame(struct libinput_device *device,
		   uint64_t time)
{
	struct libinput_event_touch *touch_event;

	if (!device_has_cap(device, LIBINPUT_DEVICE_CAP_TOUCH))
		return;

	touch_event = zalloc(sizeof *touch_event);
	if (!touch_event)
		return;

	*touch_event = (struct libinput_event_touch) {
		.time = time,
	};

	post_device_event(device, time,
			  LIBINPUT_EVENT_TOUCH_FRAME,
			  &touch_event->base);
}

static void
gesture_notify(struct libinput_device *device,
	       uint64_t time,
	       enum libinput_event_type type,
	       int finger_count,
	       int cancelled,
	       const struct normalized_coords *delta,
	       const struct normalized_coords *unaccel,
	       double scale,
	       double angle)
{
	struct libinput_event_gesture *gesture_event;

	if (!device_has_cap(device, LIBINPUT_DEVICE_CAP_GESTURE))
		return;

	gesture_event = zalloc(sizeof *gesture_event);
	if (!gesture_event)
		return;

	*gesture_event = (struct libinput_event_gesture) {
		.time = time,
		.finger_count = finger_count,
		.cancelled = cancelled,
		.delta = *delta,
		.delta_unaccel = *unaccel,
		.scale = scale,
		.angle = angle,
	};

	post_device_event(device, time, type,
			  &gesture_event->base);
}

void
gesture_notify_swipe(struct libinput_device *device,
		     uint64_t time,
		     enum libinput_event_type type,
		     int finger_count,
		     const struct normalized_coords *delta,
		     const struct normalized_coords *unaccel)
{
	gesture_notify(device, time, type, finger_count, 0, delta, unaccel,
		       0.0, 0.0);
}

void
gesture_notify_swipe_end(struct libinput_device *device,
			 uint64_t time,
			 int finger_count,
			 int cancelled)
{
	const struct normalized_coords zero = { 0.0, 0.0 };

	gesture_notify(device, time, LIBINPUT_EVENT_GESTURE_SWIPE_END,
		       finger_count, cancelled, &zero, &zero, 0.0, 0.0);
}

void
gesture_notify_pinch(struct libinput_device *device,
		     uint64_t time,
		     enum libinput_event_type type,
		     const struct normalized_coords *delta,
		     const struct normalized_coords *unaccel,
		     double scale,
		     double angle)
{
	gesture_notify(device, time, type, 2, 0, delta, unaccel,
		       scale, angle);
}

void
gesture_notify_pinch_end(struct libinput_device *device,
			 uint64_t time,
			 double scale,
			 int cancelled)
{
	const struct normalized_coords zero = { 0.0, 0.0 };

	gesture_notify(device, time, LIBINPUT_EVENT_GESTURE_PINCH_END,
		       2, cancelled, &zero, &zero, scale, 0.0);
}

static void
libinput_post_event(struct libinput *libinput,
		    struct libinput_event *event)
{
	struct libinput_event **events = libinput->events;
	size_t events_len = libinput->events_len;
	size_t events_count = libinput->events_count;
	size_t move_len;
	size_t new_out;

	events_count++;
	if (events_count > events_len) {
		events_len *= 2;
		events = realloc(events, events_len * sizeof *events);
		if (!events) {
			log_error(libinput,
				  "Failed to reallocate event ring buffer. "
				  "Events may be discarded\n");
			return;
		}

		if (libinput->events_count > 0 && libinput->events_in == 0) {
			libinput->events_in = libinput->events_len;
		} else if (libinput->events_count > 0 &&
			   libinput->events_out >= libinput->events_in) {
			move_len = libinput->events_len - libinput->events_out;
			new_out = events_len - move_len;
			memmove(events + new_out,
				events + libinput->events_out,
				move_len * sizeof *events);
			libinput->events_out = new_out;
		}

		libinput->events = events;
		libinput->events_len = events_len;
	}

	if (event->device)
		libinput_device_ref(event->device);

	libinput->events_count = events_count;
	events[libinput->events_in] = event;
	libinput->events_in = (libinput->events_in + 1) % libinput->events_len;
}

LIBINPUT_EXPORT struct libinput_event *
libinput_get_event(struct libinput *libinput)
{
	struct libinput_event *event;

	if (libinput->events_count == 0)
		return NULL;

	event = libinput->events[libinput->events_out];
	libinput->events_out =
		(libinput->events_out + 1) % libinput->events_len;
	libinput->events_count--;

	return event;
}

LIBINPUT_EXPORT enum libinput_event_type
libinput_next_event_type(struct libinput *libinput)
{
	struct libinput_event *event;

	if (libinput->events_count == 0)
		return LIBINPUT_EVENT_NONE;

	event = libinput->events[libinput->events_out];
	return event->type;
}

LIBINPUT_EXPORT void
libinput_set_user_data(struct libinput *libinput,
		       void *user_data)
{
	libinput->user_data = user_data;
}

LIBINPUT_EXPORT void *
libinput_get_user_data(struct libinput *libinput)
{
	return libinput->user_data;
}

LIBINPUT_EXPORT int
libinput_resume(struct libinput *libinput)
{
	return libinput->interface_backend->resume(libinput);
}

LIBINPUT_EXPORT void
libinput_suspend(struct libinput *libinput)
{
	libinput->interface_backend->suspend(libinput);
}

LIBINPUT_EXPORT void
libinput_device_set_user_data(struct libinput_device *device, void *user_data)
{
	device->user_data = user_data;
}

LIBINPUT_EXPORT void *
libinput_device_get_user_data(struct libinput_device *device)
{
	return device->user_data;
}

LIBINPUT_EXPORT struct libinput *
libinput_device_get_context(struct libinput_device *device)
{
	return libinput_seat_get_context(device->seat);
}

LIBINPUT_EXPORT struct libinput_device_group *
libinput_device_get_device_group(struct libinput_device *device)
{
	return device->group;
}

LIBINPUT_EXPORT const char *
libinput_device_get_sysname(struct libinput_device *device)
{
	return evdev_device_get_sysname((struct evdev_device *) device);
}

LIBINPUT_EXPORT const char *
libinput_device_get_name(struct libinput_device *device)
{
	return evdev_device_get_name((struct evdev_device *) device);
}

LIBINPUT_EXPORT unsigned int
libinput_device_get_id_product(struct libinput_device *device)
{
	return evdev_device_get_id_product((struct evdev_device *) device);
}

LIBINPUT_EXPORT unsigned int
libinput_device_get_id_vendor(struct libinput_device *device)
{
	return evdev_device_get_id_vendor((struct evdev_device *) device);
}

LIBINPUT_EXPORT const char *
libinput_device_get_output_name(struct libinput_device *device)
{
	return evdev_device_get_output((struct evdev_device *) device);
}

LIBINPUT_EXPORT struct libinput_seat *
libinput_device_get_seat(struct libinput_device *device)
{
	return device->seat;
}

LIBINPUT_EXPORT int
libinput_device_set_seat_logical_name(struct libinput_device *device,
				      const char *name)
{
	struct libinput *libinput = device->seat->libinput;

	if (name == NULL)
		return -1;

	return libinput->interface_backend->device_change_seat(device,
							       name);
}

LIBINPUT_EXPORT struct udev_device *
libinput_device_get_udev_device(struct libinput_device *device)
{
	return evdev_device_get_udev_device((struct evdev_device *)device);
}

LIBINPUT_EXPORT void
libinput_device_led_update(struct libinput_device *device,
			   enum libinput_led leds)
{
	evdev_device_led_update((struct evdev_device *) device, leds);
}

LIBINPUT_EXPORT int
libinput_device_has_capability(struct libinput_device *device,
			       enum libinput_device_capability capability)
{
	return evdev_device_has_capability((struct evdev_device *) device,
					   capability);
}

LIBINPUT_EXPORT int
libinput_device_get_size(struct libinput_device *device,
			 double *width,
			 double *height)
{
	return evdev_device_get_size((struct evdev_device *)device,
				     width,
				     height);
}

LIBINPUT_EXPORT int
libinput_device_pointer_has_button(struct libinput_device *device, uint32_t code)
{
	return evdev_device_has_button((struct evdev_device *)device, code);
}

LIBINPUT_EXPORT int
libinput_device_keyboard_has_key(struct libinput_device *device, uint32_t code)
{
	return evdev_device_has_key((struct evdev_device *)device, code);
}

LIBINPUT_EXPORT struct libinput_event *
libinput_event_device_notify_get_base_event(struct libinput_event_device_notify *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   NULL,
			   LIBINPUT_EVENT_DEVICE_ADDED,
			   LIBINPUT_EVENT_DEVICE_REMOVED);

	return &event->base;
}

LIBINPUT_EXPORT struct libinput_event *
libinput_event_keyboard_get_base_event(struct libinput_event_keyboard *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   NULL,
			   LIBINPUT_EVENT_KEYBOARD_KEY);

	return &event->base;
}

LIBINPUT_EXPORT struct libinput_event *
libinput_event_pointer_get_base_event(struct libinput_event_pointer *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   NULL,
			   LIBINPUT_EVENT_POINTER_MOTION,
			   LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE,
			   LIBINPUT_EVENT_POINTER_BUTTON,
			   LIBINPUT_EVENT_POINTER_AXIS);

	return &event->base;
}

LIBINPUT_EXPORT struct libinput_event *
libinput_event_touch_get_base_event(struct libinput_event_touch *event)
{
	require_event_type(libinput_event_get_context(&event->base),
			   event->base.type,
			   NULL,
			   LIBINPUT_EVENT_TOUCH_DOWN,
			   LIBINPUT_EVENT_TOUCH_UP,
			   LIBINPUT_EVENT_TOUCH_MOTION,
			   LIBINPUT_EVENT_TOUCH_CANCEL,
			   LIBINPUT_EVENT_TOUCH_FRAME);

	return &event->base;
}

LIBINPUT_EXPORT struct libinput_event *
libinput_event_gesture_get_base_event(struct libinput_event_gesture *event)
{
	return &event->base;
}

LIBINPUT_EXPORT struct libinput_device_group *
libinput_device_group_ref(struct libinput_device_group *group)
{
	group->refcount++;
	return group;
}

struct libinput_device_group *
libinput_device_group_create(struct libinput *libinput,
			     const char *identifier)
{
	struct libinput_device_group *group;

	group = zalloc(sizeof *group);
	if (!group)
		return NULL;

	group->refcount = 1;
	if (identifier) {
		group->identifier = strdup(identifier);
		if (!group->identifier) {
			free(group);
			return NULL;
		}
	}

	list_init(&group->link);
	list_insert(&libinput->device_group_list, &group->link);

	return group;
}

struct libinput_device_group *
libinput_device_group_find_group(struct libinput *libinput,
				 const char *identifier)
{
	struct libinput_device_group *g = NULL;

	list_for_each(g, &libinput->device_group_list, link) {
		if (identifier && g->identifier &&
		    streq(g->identifier, identifier)) {
			return g;
		}
	}

	return NULL;
}

void
libinput_device_set_device_group(struct libinput_device *device,
				 struct libinput_device_group *group)
{
	device->group = group;
	libinput_device_group_ref(group);
}

static void
libinput_device_group_destroy(struct libinput_device_group *group)
{
	list_remove(&group->link);
	free(group->identifier);
	free(group);
}

LIBINPUT_EXPORT struct libinput_device_group *
libinput_device_group_unref(struct libinput_device_group *group)
{
	assert(group->refcount > 0);
	group->refcount--;
	if (group->refcount == 0) {
		libinput_device_group_destroy(group);
		return NULL;
	} else {
		return group;
	}
}

LIBINPUT_EXPORT void
libinput_device_group_set_user_data(struct libinput_device_group *group,
				    void *user_data)
{
	group->user_data = user_data;
}

LIBINPUT_EXPORT void *
libinput_device_group_get_user_data(struct libinput_device_group *group)
{
	return group->user_data;
}

LIBINPUT_EXPORT const char *
libinput_config_status_to_str(enum libinput_config_status status)
{
	const char *str = NULL;

	switch(status) {
	case LIBINPUT_CONFIG_STATUS_SUCCESS:
		str = "Success";
		break;
	case LIBINPUT_CONFIG_STATUS_UNSUPPORTED:
		str = "Unsupported configuration option";
		break;
	case LIBINPUT_CONFIG_STATUS_INVALID:
		str = "Invalid argument range";
		break;
	}

	return str;
}

LIBINPUT_EXPORT int
libinput_device_config_tap_get_finger_count(struct libinput_device *device)
{
	return device->config.tap ? device->config.tap->count(device) : 0;
}

LIBINPUT_EXPORT enum libinput_config_status
libinput_device_config_tap_set_enabled(struct libinput_device *device,
				       enum libinput_config_tap_state enable)
{
	if (enable != LIBINPUT_CONFIG_TAP_ENABLED &&
	    enable != LIBINPUT_CONFIG_TAP_DISABLED)
		return LIBINPUT_CONFIG_STATUS_INVALID;

	if (libinput_device_config_tap_get_finger_count(device) == 0)
		return enable ? LIBINPUT_CONFIG_STATUS_UNSUPPORTED :
				LIBINPUT_CONFIG_STATUS_SUCCESS;

	return device->config.tap->set_enabled(device, enable);

}

LIBINPUT_EXPORT enum libinput_config_tap_state
libinput_device_config_tap_get_enabled(struct libinput_device *device)
{
	if (libinput_device_config_tap_get_finger_count(device) == 0)
		return LIBINPUT_CONFIG_TAP_DISABLED;

	return device->config.tap->get_enabled(device);
}

LIBINPUT_EXPORT enum libinput_config_tap_state
libinput_device_config_tap_get_default_enabled(struct libinput_device *device)
{
	if (libinput_device_config_tap_get_finger_count(device) == 0)
		return LIBINPUT_CONFIG_TAP_DISABLED;

	return device->config.tap->get_default(device);
}

LIBINPUT_EXPORT enum libinput_config_status
libinput_device_config_tap_set_drag_lock_enabled(struct libinput_device *device,
						 enum libinput_config_drag_lock_state enable)
{
	if (enable != LIBINPUT_CONFIG_DRAG_LOCK_ENABLED &&
	    enable != LIBINPUT_CONFIG_DRAG_LOCK_DISABLED)
		return LIBINPUT_CONFIG_STATUS_INVALID;

	if (libinput_device_config_tap_get_finger_count(device) == 0)
		return enable ? LIBINPUT_CONFIG_STATUS_UNSUPPORTED :
				LIBINPUT_CONFIG_STATUS_SUCCESS;

	return device->config.tap->set_draglock_enabled(device, enable);
}

LIBINPUT_EXPORT enum libinput_config_drag_lock_state
libinput_device_config_tap_get_drag_lock_enabled(struct libinput_device *device)
{
	if (libinput_device_config_tap_get_finger_count(device) == 0)
		return LIBINPUT_CONFIG_DRAG_LOCK_DISABLED;

	return device->config.tap->get_draglock_enabled(device);
}

LIBINPUT_EXPORT enum libinput_config_drag_lock_state
libinput_device_config_tap_get_default_drag_lock_enabled(struct libinput_device *device)
{
	if (libinput_device_config_tap_get_finger_count(device) == 0)
		return LIBINPUT_CONFIG_DRAG_LOCK_DISABLED;

	return device->config.tap->get_default_draglock_enabled(device);
}

LIBINPUT_EXPORT int
libinput_device_config_calibration_has_matrix(struct libinput_device *device)
{
	return device->config.calibration ?
		device->config.calibration->has_matrix(device) : 0;
}

LIBINPUT_EXPORT enum libinput_config_status
libinput_device_config_calibration_set_matrix(struct libinput_device *device,
					      const float matrix[6])
{
	if (!libinput_device_config_calibration_has_matrix(device))
		return LIBINPUT_CONFIG_STATUS_UNSUPPORTED;

	return device->config.calibration->set_matrix(device, matrix);
}

LIBINPUT_EXPORT int
libinput_device_config_calibration_get_matrix(struct libinput_device *device,
					      float matrix[6])
{
	if (!libinput_device_config_calibration_has_matrix(device))
		return 0;

	return device->config.calibration->get_matrix(device, matrix);
}

LIBINPUT_EXPORT int
libinput_device_config_calibration_get_default_matrix(struct libinput_device *device,
						      float matrix[6])
{
	if (!libinput_device_config_calibration_has_matrix(device))
		return 0;

	return device->config.calibration->get_default_matrix(device, matrix);
}

LIBINPUT_EXPORT uint32_t
libinput_device_config_send_events_get_modes(struct libinput_device *device)
{
	uint32_t modes = LIBINPUT_CONFIG_SEND_EVENTS_ENABLED;

	if (device->config.sendevents)
		modes |= device->config.sendevents->get_modes(device);

	return modes;
}

LIBINPUT_EXPORT enum libinput_config_status
libinput_device_config_send_events_set_mode(struct libinput_device *device,
					    uint32_t mode)
{
	if ((libinput_device_config_send_events_get_modes(device) & mode) != mode)
		return LIBINPUT_CONFIG_STATUS_UNSUPPORTED;

	if (device->config.sendevents)
		return device->config.sendevents->set_mode(device, mode);
	else /* mode must be _ENABLED to get here */
		return LIBINPUT_CONFIG_STATUS_SUCCESS;
}

LIBINPUT_EXPORT uint32_t
libinput_device_config_send_events_get_mode(struct libinput_device *device)
{
	if (device->config.sendevents)
		return device->config.sendevents->get_mode(device);
	else
		return LIBINPUT_CONFIG_SEND_EVENTS_ENABLED;
}

LIBINPUT_EXPORT uint32_t
libinput_device_config_send_events_get_default_mode(struct libinput_device *device)
{
	return LIBINPUT_CONFIG_SEND_EVENTS_ENABLED;
}

LIBINPUT_EXPORT int
libinput_device_config_accel_is_available(struct libinput_device *device)
{
	return device->config.accel ?
		device->config.accel->available(device) : 0;
}

LIBINPUT_EXPORT enum libinput_config_status
libinput_device_config_accel_set_speed(struct libinput_device *device,
				       double speed)
{
	/* Need the negation in case speed is NaN */
	if (!(speed >= -1.0 && speed <= 1.0))
		return LIBINPUT_CONFIG_STATUS_INVALID;

	if (!libinput_device_config_accel_is_available(device))
		return LIBINPUT_CONFIG_STATUS_UNSUPPORTED;

	return device->config.accel->set_speed(device, speed);
}
LIBINPUT_EXPORT double
libinput_device_config_accel_get_speed(struct libinput_device *device)
{
	if (!libinput_device_config_accel_is_available(device))
		return 0;

	return device->config.accel->get_speed(device);
}

LIBINPUT_EXPORT double
libinput_device_config_accel_get_default_speed(struct libinput_device *device)
{
	if (!libinput_device_config_accel_is_available(device))
		return 0;

	return device->config.accel->get_default_speed(device);
}

LIBINPUT_EXPORT uint32_t
libinput_device_config_accel_get_profiles(struct libinput_device *device)
{
	if (!libinput_device_config_accel_is_available(device))
		return 0;

	return device->config.accel->get_profiles(device);
}

LIBINPUT_EXPORT enum libinput_config_accel_profile
libinput_device_config_accel_get_profile(struct libinput_device *device)
{
	if (!libinput_device_config_accel_is_available(device))
		return LIBINPUT_CONFIG_ACCEL_PROFILE_NONE;

	return device->config.accel->get_profile(device);
}

LIBINPUT_EXPORT enum libinput_config_accel_profile
libinput_device_config_accel_get_default_profile(struct libinput_device *device)
{
	if (!libinput_device_config_accel_is_available(device))
		return LIBINPUT_CONFIG_ACCEL_PROFILE_NONE;

	return device->config.accel->get_profile(device);
}

LIBINPUT_EXPORT enum libinput_config_status
libinput_device_config_accel_set_profile(struct libinput_device *device,
					 enum libinput_config_accel_profile profile)
{
	switch (profile) {
	case LIBINPUT_CONFIG_ACCEL_PROFILE_FLAT:
	case LIBINPUT_CONFIG_ACCEL_PROFILE_ADAPTIVE:
		break;
	default:
		return LIBINPUT_CONFIG_STATUS_INVALID;
	}

	if (!libinput_device_config_accel_is_available(device) ||
	    (libinput_device_config_accel_get_profiles(device) & profile) == 0)
		return LIBINPUT_CONFIG_STATUS_UNSUPPORTED;

	return device->config.accel->set_profile(device, profile);
}

LIBINPUT_EXPORT int
libinput_device_config_scroll_has_natural_scroll(struct libinput_device *device)
{
	if (!device->config.natural_scroll)
		return 0;

	return device->config.natural_scroll->has(device);
}

LIBINPUT_EXPORT enum libinput_config_status
libinput_device_config_scroll_set_natural_scroll_enabled(struct libinput_device *device,
							 int enabled)
{
	if (!libinput_device_config_scroll_has_natural_scroll(device))
		return LIBINPUT_CONFIG_STATUS_UNSUPPORTED;

	return device->config.natural_scroll->set_enabled(device, enabled);
}

LIBINPUT_EXPORT int
libinput_device_config_scroll_get_natural_scroll_enabled(struct libinput_device *device)
{
	if (!device->config.natural_scroll)
		return 0;

	return device->config.natural_scroll->get_enabled(device);
}

LIBINPUT_EXPORT int
libinput_device_config_scroll_get_default_natural_scroll_enabled(struct libinput_device *device)
{
	if (!device->config.natural_scroll)
		return 0;

	return device->config.natural_scroll->get_default_enabled(device);
}

LIBINPUT_EXPORT int
libinput_device_config_left_handed_is_available(struct libinput_device *device)
{
	if (!device->config.left_handed)
		return 0;

	return device->config.left_handed->has(device);
}

LIBINPUT_EXPORT enum libinput_config_status
libinput_device_config_left_handed_set(struct libinput_device *device,
				       int left_handed)
{
	if (!libinput_device_config_left_handed_is_available(device))
		return LIBINPUT_CONFIG_STATUS_UNSUPPORTED;

	return device->config.left_handed->set(device, left_handed);
}

LIBINPUT_EXPORT int
libinput_device_config_left_handed_get(struct libinput_device *device)
{
	if (!libinput_device_config_left_handed_is_available(device))
		return 0;

	return device->config.left_handed->get(device);
}

LIBINPUT_EXPORT int
libinput_device_config_left_handed_get_default(struct libinput_device *device)
{
	if (!libinput_device_config_left_handed_is_available(device))
		return 0;

	return device->config.left_handed->get_default(device);
}

LIBINPUT_EXPORT uint32_t
libinput_device_config_click_get_methods(struct libinput_device *device)
{
	if (device->config.click_method)
		return device->config.click_method->get_methods(device);
	else
		return 0;
}

LIBINPUT_EXPORT enum libinput_config_status
libinput_device_config_click_set_method(struct libinput_device *device,
					enum libinput_config_click_method method)
{
	/* Check method is a single valid method */
	switch (method) {
	case LIBINPUT_CONFIG_CLICK_METHOD_NONE:
	case LIBINPUT_CONFIG_CLICK_METHOD_BUTTON_AREAS:
	case LIBINPUT_CONFIG_CLICK_METHOD_CLICKFINGER:
		break;
	default:
		return LIBINPUT_CONFIG_STATUS_INVALID;
	}

	if ((libinput_device_config_click_get_methods(device) & method) != method)
		return LIBINPUT_CONFIG_STATUS_UNSUPPORTED;

	if (device->config.click_method)
		return device->config.click_method->set_method(device, method);
	else /* method must be _NONE to get here */
		return LIBINPUT_CONFIG_STATUS_SUCCESS;
}

LIBINPUT_EXPORT enum libinput_config_click_method
libinput_device_config_click_get_method(struct libinput_device *device)
{
	if (device->config.click_method)
		return device->config.click_method->get_method(device);
	else
		return LIBINPUT_CONFIG_CLICK_METHOD_NONE;
}

LIBINPUT_EXPORT enum libinput_config_click_method
libinput_device_config_click_get_default_method(struct libinput_device *device)
{
	if (device->config.click_method)
		return device->config.click_method->get_default_method(device);
	else
		return LIBINPUT_CONFIG_CLICK_METHOD_NONE;
}

LIBINPUT_EXPORT int
libinput_device_config_middle_emulation_is_available(
		struct libinput_device *device)
{
	if (device->config.middle_emulation)
		return device->config.middle_emulation->available(device);
	else
		return LIBINPUT_CONFIG_MIDDLE_EMULATION_DISABLED;
}

LIBINPUT_EXPORT enum libinput_config_status
libinput_device_config_middle_emulation_set_enabled(
		struct libinput_device *device,
		enum libinput_config_middle_emulation_state enable)
{
	int available =
		libinput_device_config_middle_emulation_is_available(device);

	switch (enable) {
	case LIBINPUT_CONFIG_MIDDLE_EMULATION_DISABLED:
		if (!available)
			return LIBINPUT_CONFIG_STATUS_SUCCESS;
		break;
	case LIBINPUT_CONFIG_MIDDLE_EMULATION_ENABLED:
		if (!available)
			return LIBINPUT_CONFIG_STATUS_UNSUPPORTED;
		break;
	default:
		return LIBINPUT_CONFIG_STATUS_INVALID;
	}

	return device->config.middle_emulation->set(device, enable);
}

LIBINPUT_EXPORT enum libinput_config_middle_emulation_state
libinput_device_config_middle_emulation_get_enabled(
		struct libinput_device *device)
{
	if (!libinput_device_config_middle_emulation_is_available(device))
		return LIBINPUT_CONFIG_MIDDLE_EMULATION_DISABLED;

	return device->config.middle_emulation->get(device);
}

LIBINPUT_EXPORT enum libinput_config_middle_emulation_state
libinput_device_config_middle_emulation_get_default_enabled(
		struct libinput_device *device)
{
	if (!libinput_device_config_middle_emulation_is_available(device))
		return LIBINPUT_CONFIG_MIDDLE_EMULATION_DISABLED;

	return device->config.middle_emulation->get_default(device);
}

LIBINPUT_EXPORT uint32_t
libinput_device_config_scroll_get_methods(struct libinput_device *device)
{
	if (device->config.scroll_method)
		return device->config.scroll_method->get_methods(device);
	else
		return 0;
}

LIBINPUT_EXPORT enum libinput_config_status
libinput_device_config_scroll_set_method(struct libinput_device *device,
					 enum libinput_config_scroll_method method)
{
	/* Check method is a single valid method */
	switch (method) {
	case LIBINPUT_CONFIG_SCROLL_NO_SCROLL:
	case LIBINPUT_CONFIG_SCROLL_2FG:
	case LIBINPUT_CONFIG_SCROLL_EDGE:
	case LIBINPUT_CONFIG_SCROLL_ON_BUTTON_DOWN:
		break;
	default:
		return LIBINPUT_CONFIG_STATUS_INVALID;
	}

	if ((libinput_device_config_scroll_get_methods(device) & method) != method)
		return LIBINPUT_CONFIG_STATUS_UNSUPPORTED;

	if (device->config.scroll_method)
		return device->config.scroll_method->set_method(device, method);
	else /* method must be _NO_SCROLL to get here */
		return LIBINPUT_CONFIG_STATUS_SUCCESS;
}

LIBINPUT_EXPORT enum libinput_config_scroll_method
libinput_device_config_scroll_get_method(struct libinput_device *device)
{
	if (device->config.scroll_method)
		return device->config.scroll_method->get_method(device);
	else
		return LIBINPUT_CONFIG_SCROLL_NO_SCROLL;
}

LIBINPUT_EXPORT enum libinput_config_scroll_method
libinput_device_config_scroll_get_default_method(struct libinput_device *device)
{
	if (device->config.scroll_method)
		return device->config.scroll_method->get_default_method(device);
	else
		return LIBINPUT_CONFIG_SCROLL_NO_SCROLL;
}

LIBINPUT_EXPORT enum libinput_config_status
libinput_device_config_scroll_set_button(struct libinput_device *device,
					 uint32_t button)
{
	if (button && !libinput_device_pointer_has_button(device, button))
		return LIBINPUT_CONFIG_STATUS_INVALID;

	if ((libinput_device_config_scroll_get_methods(device) &
	     LIBINPUT_CONFIG_SCROLL_ON_BUTTON_DOWN) == 0)
		return LIBINPUT_CONFIG_STATUS_UNSUPPORTED;

	return device->config.scroll_method->set_button(device, button);
}

LIBINPUT_EXPORT uint32_t
libinput_device_config_scroll_get_button(struct libinput_device *device)
{
	if ((libinput_device_config_scroll_get_methods(device) &
	     LIBINPUT_CONFIG_SCROLL_ON_BUTTON_DOWN) == 0)
		return 0;

	return device->config.scroll_method->get_button(device);
}

LIBINPUT_EXPORT uint32_t
libinput_device_config_scroll_get_default_button(struct libinput_device *device)
{
	if ((libinput_device_config_scroll_get_methods(device) &
	     LIBINPUT_CONFIG_SCROLL_ON_BUTTON_DOWN) == 0)
		return 0;

	return device->config.scroll_method->get_default_button(device);
}

LIBINPUT_EXPORT int
libinput_device_config_dwt_is_available(struct libinput_device *device)
{
	if (!device->config.dwt)
		return 0;

	return device->config.dwt->is_available(device);
}

LIBINPUT_EXPORT enum libinput_config_status
libinput_device_config_dwt_set_enabled(struct libinput_device *device,
				       enum libinput_config_dwt_state enable)
{
	if (enable != LIBINPUT_CONFIG_DWT_ENABLED &&
	    enable != LIBINPUT_CONFIG_DWT_DISABLED)
		return LIBINPUT_CONFIG_STATUS_INVALID;

	if (!libinput_device_config_dwt_is_available(device))
		return enable ? LIBINPUT_CONFIG_STATUS_UNSUPPORTED :
				LIBINPUT_CONFIG_STATUS_SUCCESS;

	return device->config.dwt->set_enabled(device, enable);
}

LIBINPUT_EXPORT enum libinput_config_dwt_state
libinput_device_config_dwt_get_enabled(struct libinput_device *device)
{
	if (!libinput_device_config_dwt_is_available(device))
		return LIBINPUT_CONFIG_DWT_DISABLED;

	return device->config.dwt->get_enabled(device);
}

LIBINPUT_EXPORT enum libinput_config_dwt_state
libinput_device_config_dwt_get_default_enabled(struct libinput_device *device)
{
	if (!libinput_device_config_dwt_is_available(device))
		return LIBINPUT_CONFIG_DWT_DISABLED;

	return device->config.dwt->get_default_enabled(device);
}