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 * videobuf2-core.h - Video Buffer 2 Core Framework
 *
 * Copyright (C) 2010 Samsung Electronics
 *
 * Author: Pawel Osciak <pawel@osciak.com>
 *
 * 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.
 */
#ifndef _MEDIA_VIDEOBUF2_CORE_H
#define _MEDIA_VIDEOBUF2_CORE_H

#include <linux/mm_types.h>
#include <linux/mutex.h>
#include <linux/poll.h>
#include <linux/dma-buf.h>
#include <linux/bitops.h>
#include <media/media-request.h>
#include <media/frame_vector.h>

#define VB2_MAX_FRAME	(32)
#define VB2_MAX_PLANES	(8)

/**
 * enum vb2_memory - type of memory model used to make the buffers visible
 *	on userspace.
 *
 * @VB2_MEMORY_UNKNOWN:	Buffer status is unknown or it is not used yet on
 *			userspace.
 * @VB2_MEMORY_MMAP:	The buffers are allocated by the Kernel and it is
 *			memory mapped via mmap() ioctl. This model is
 *			also used when the user is using the buffers via
 *			read() or write() system calls.
 * @VB2_MEMORY_USERPTR:	The buffers was allocated in userspace and it is
 *			memory mapped via mmap() ioctl.
 * @VB2_MEMORY_DMABUF:	The buffers are passed to userspace via DMA buffer.
 */
enum vb2_memory {
	VB2_MEMORY_UNKNOWN	= 0,
	VB2_MEMORY_MMAP		= 1,
	VB2_MEMORY_USERPTR	= 2,
	VB2_MEMORY_DMABUF	= 4,
};

struct vb2_fileio_data;
struct vb2_threadio_data;
struct vb2_buffer;

/**
 * struct vb2_mem_ops - memory handling/memory allocator operations.
 * @alloc:	allocate video memory and, optionally, allocator private data,
 *		return ERR_PTR() on failure or a pointer to allocator private,
 *		per-buffer data on success; the returned private structure
 *		will then be passed as @buf_priv argument to other ops in this
 *		structure. The size argument to this function shall be
 *		*page aligned*.
 * @put:	inform the allocator that the buffer will no longer be used;
 *		usually will result in the allocator freeing the buffer (if
 *		no other users of this buffer are present); the @buf_priv
 *		argument is the allocator private per-buffer structure
 *		previously returned from the alloc callback.
 * @get_dmabuf: acquire userspace memory for a hardware operation; used for
 *		 DMABUF memory types.
 * @get_userptr: acquire userspace memory for a hardware operation; used for
 *		 USERPTR memory types; vaddr is the address passed to the
 *		 videobuf2 layer when queuing a video buffer of USERPTR type;
 *		 should return an allocator private per-buffer structure
 *		 associated with the buffer on success, ERR_PTR() on failure;
 *		 the returned private structure will then be passed as @buf_priv
 *		 argument to other ops in this structure.
 * @put_userptr: inform the allocator that a USERPTR buffer will no longer
 *		 be used.
 * @prepare:	called every time the buffer is passed from userspace to the
 *		driver, useful for cache synchronisation, optional.
 * @finish:	called every time the buffer is passed back from the driver
 *		to the userspace, also optional.
 * @attach_dmabuf: attach a shared &struct dma_buf for a hardware operation;
 *		   used for DMABUF memory types; dev is the alloc device
 *		   dbuf is the shared dma_buf; returns ERR_PTR() on failure;
 *		   allocator private per-buffer structure on success;
 *		   this needs to be used for further accesses to the buffer.
 * @detach_dmabuf: inform the exporter of the buffer that the current DMABUF
 *		   buffer is no longer used; the @buf_priv argument is the
 *		   allocator private per-buffer structure previously returned
 *		   from the attach_dmabuf callback.
 * @map_dmabuf: request for access to the dmabuf from allocator; the allocator
 *		of dmabuf is informed that this driver is going to use the
 *		dmabuf.
 * @unmap_dmabuf: releases access control to the dmabuf - allocator is notified
 *		  that this driver is done using the dmabuf for now.
 * @vaddr:	return a kernel virtual address to a given memory buffer
 *		associat