/*
 * Copyright 2012 Google, Inc
 * Copyright © 2016 Collabora, Ltd.
 *
 * Based on the implementation from the Android Open Source Project
 *
 * 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.
 *
 * Authors:
 *    Robert Foss <robert.foss@collabora.com>
 */

#include <fcntl.h>
#include <poll.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <linux/sync_file.h>
#include <sys/ioctl.h>

#include "sw_sync.h"

#ifndef SW_SYNC_IOC_INC
struct sw_sync_create_fence_data {
	__u32	value;
	char	name[32];
	__s32	fence;
};

#define SW_SYNC_IOC_MAGIC		'W'
#define SW_SYNC_IOC_CREATE_FENCE	_IOWR(SW_SYNC_IOC_MAGIC, 0,\
						struct sw_sync_create_fence_data)
#define SW_SYNC_IOC_INC			_IOW(SW_SYNC_IOC_MAGIC, 1, __u32)
#endif

#define DEVFS_SW_SYNC   "/dev/sw_sync"
#define DEBUGFS_SW_SYNC "/sys/kernel/debug/sync/sw_sync"

bool sw_sync_is_supported(void)
{
	if (access(DEVFS_SW_SYNC, R_OK | W_OK) != -1) {
		return true;
	} else if (access(DEBUGFS_SW_SYNC, R_OK | W_OK) != -1 ) {
		return true;
	}

	return false;
}

int sw_sync_timeline_create(void)
{
	int fd = open(DEVFS_SW_SYNC, O_RDWR);

	if (fd < 0)
		fd = open(DEBUGFS_SW_SYNC, O_RDWR);

	return fd;
}

void sw_sync_timeline_destroy(int fd)
{
	close(fd);
}

void sw_sync_fence_destroy(int fd)
{
	close(fd);
}

int sw_sync_fence_create(int fd, int32_t seqno)
{
	struct sw_sync_create_fence_data data = {};
	data.value = seqno;

	if (fd < 0)
		return -1;

	ioctl(fd, SW_SYNC_IOC_CREATE_FENCE, &data);

	return data.fence;
}

void sw_sync_timeline_inc(int fd, uint32_t count)
{
	uint32_t arg = count;

	if (fd == 0 || fd == -1)
		return;

	ioctl(fd, SW_SYNC_IOC_INC, &arg);
}