[media] vb2: fix VBI/poll regression

[pandora-kernel.git] / include / media / videobuf2-core.h

/*
 * videobuf2-core.h - V4L2 driver helper 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/videodev2.h>
#include <linux/dma-buf.h>

struct vb2_alloc_ctx;
struct vb2_fileio_data;
struct vb2_threadio_data;

/**
 * struct vb2_mem_ops - memory handling/memory allocator operations
 * @alloc:      allocate video memory and, optionally, allocator private data,
 *              return NULL 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. Additional gfp_flags to use when allocating the
 *              are also passed to this operation. These flags are from the
 *              gfp_flags field of vb2_queue.
 * @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_userptr: acquire userspace memory for a hardware operation; used for
 *               USERPTR memory types; vaddr is the address passed to the
 *               videobuf layer when queuing a video buffer of USERPTR type;
 *               should return an allocator private per-buffer structure
 *               associated with the buffer on success, NULL 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.
 * @attach_dmabuf: attach a shared struct dma_buf for a hardware operation;
 *                 used for DMABUF memory types; alloc_ctx is the alloc context
 *                 dbuf is the shared dma_buf; returns NULL 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.
 * @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.
 * @vaddr:      return a kernel virtual address to a given memory buffer
 *              associated with the passed private structure or NULL if no
 *              such mapping exists.
 * @cookie:     return allocator specific cookie for a given memory buffer
 *              associated with the passed private structure or NULL if not
 *              available.
 * @num_users:  return the current number of users of a memory buffer;
 *              return 1 if the videobuf layer (or actually the driver using
 *              it) is the only user.
 * @mmap:       setup a userspace mapping for a given memory buffer under
 *              the provided virtual memory region.
 *
 * Required ops for USERPTR types: get_userptr, put_userptr.
 * Required ops for MMAP types: alloc, put, num_users, mmap.
 * Required ops for read/write access types: alloc, put, num_users, vaddr.
 * Required ops for DMABUF types: attach_dmabuf, detach_dmabuf, map_dmabuf,
 *                                unmap_dmabuf.
 */
struct vb2_mem_ops {
        void            *(*alloc)(void *alloc_ctx, unsigned long size, gfp_t gfp_flags);
        void            (*put)(void *buf_priv);
        struct dma_buf *(*get_dmabuf)(void *buf_priv, unsigned long flags);

        void            *(*get_userptr)(void *alloc_ctx, unsigned long vaddr,
                                        unsigned long size, int write);
        void            (*put_userptr)(void *buf_priv);

        void            (*prepare)(void *buf_priv);
        void            (*finish)(void *buf_priv);

        void            *(*attach_dmabuf)(void *alloc_ctx, struct dma_buf *dbuf,
                                unsigned long size, int write);
        void            (*detach_dmabuf)(void *buf_priv);
        int             (*map_dmabuf)(void *buf_priv);
        void            (*unmap_dmabuf)(void *buf_priv);

        void            *(*vaddr)(void *buf_priv);
        void            *(*cookie)(void *buf_priv);

        unsigned int    (*num_users)(void *buf_priv);

        int             (*mmap)(void *buf_priv, struct vm_area_struct *vma);
};

struct vb2_plane {
        void                    *mem_priv;
        struct dma_buf          *dbuf;
        unsigned int            dbuf_mapped;
};

/**
 * enum vb2_io_modes - queue access methods
 * @VB2_MMAP:           driver supports MMAP with streaming API
 * @VB2_USERPTR:        driver supports USERPTR with streaming API
 * @VB2_READ:           driver supports read() style access
 * @VB2_WRITE:          driver supports write() style access
 * @VB2_DMABUF:         driver supports DMABUF with streaming API
 */
enum vb2_io_modes {
        VB2_MMAP        = (1 << 0),
        VB2_USERPTR     = (1 << 1),
        VB2_READ        = (1 << 2),
        VB2_WRITE       = (1 << 3),
        VB2_DMABUF      = (1 << 4),
};

/**
 * enum vb2_fileio_flags - flags for selecting a mode of the file io emulator,
 * by default the 'streaming' style is used by the file io emulator
 * @VB2_FILEIO_READ_ONCE:       report EOF after reading the first buffer
 * @VB2_FILEIO_WRITE_IMMEDIATELY:       queue buffer after each write() call
 */
enum vb2_fileio_flags {
        VB2_FILEIO_READ_ONCE            = (1 << 0),
        VB2_FILEIO_WRITE_IMMEDIATELY    = (1 << 1),
};

/**
 * enum vb2_buffer_state - current video buffer state
 * @VB2_BUF_STATE_DEQUEUED:     buffer under userspace control
 * @VB2_BUF_STATE_PREPARING:    buffer is being prepared in videobuf
 * @VB2_BUF_STATE_PREPARED:     buffer prepared in videobuf and by the driver
 * @VB2_BUF_STATE_QUEUED:       buffer queued in videobuf, but not in driver
 * @VB2_BUF_STATE_ACTIVE:       buffer queued in driver and possibly used
 *                              in a hardware operation
 * @VB2_BUF_STATE_DONE:         buffer returned from driver to videobuf, but
 *                              not yet dequeued to userspace
 * @VB2_BUF_STATE_ERROR:        same as above, but the operation on the buffer
 *                              has ended with an error, which will be reported
 *                              to the userspace when it is dequeued
 */
enum vb2_buffer_state {
        VB2_BUF_STATE_DEQUEUED,
        VB2_BUF_STATE_PREPARING,
        VB2_BUF_STATE_PREPARED,
        VB2_BUF_STATE_QUEUED,
        VB2_BUF_STATE_ACTIVE,
        VB2_BUF_STATE_DONE,
        VB2_BUF_STATE_ERROR,
};

struct vb2_queue;

/**
 * struct vb2_buffer - represents a video buffer
 * @v4l2_buf:           struct v4l2_buffer associated with this buffer; can
 *                      be read by the driver and relevant entries can be
 *                      changed by the driver in case of CAPTURE types
 *                      (such as timestamp)
 * @v4l2_planes:        struct v4l2_planes associated with this buffer; can
 *                      be read by the driver and relevant entries can be
 *                      changed by the driver in case of CAPTURE types
 *                      (such as bytesused); NOTE that even for single-planar
 *                      types, the v4l2_planes[0] struct should be used
 *                      instead of v4l2_buf for filling bytesused - drivers
 *                      should use the vb2_set_plane_payload() function for that
 * @vb2_queue:          the queue to which this driver belongs
 * @num_planes:         number of planes in the buffer
 *                      on an internal driver queue
 * @state:              current buffer state; do not change
 * @queued_entry:       entry on the queued buffers list, which holds all
 *                      buffers queued from userspace
 * @done_entry:         entry on the list that stores all buffers ready to
 *                      be dequeued to userspace
 * @planes:             private per-plane information; do not change
 */
struct vb2_buffer {
        struct v4l2_buffer      v4l2_buf;
        struct v4l2_plane       v4l2_planes[VIDEO_MAX_PLANES];

        struct vb2_queue        *vb2_queue;

        unsigned int            num_planes;

/* Private: internal use only */
        enum vb2_buffer_state   state;

        struct list_head        queued_entry;
        struct list_head        done_entry;

        struct vb2_plane        planes[VIDEO_MAX_PLANES];

#ifdef CONFIG_VIDEO_ADV_DEBUG
        /*
         * Counters for how often these buffer-related ops are
         * called. Used to check for unbalanced ops.
         */
        u32             cnt_mem_alloc;
        u32             cnt_mem_put;
        u32             cnt_mem_get_dmabuf;
        u32             cnt_mem_get_userptr;
        u32             cnt_mem_put_userptr;
        u32             cnt_mem_prepare;
        u32             cnt_mem_finish;
        u32             cnt_mem_attach_dmabuf;
        u32             cnt_mem_detach_dmabuf;
        u32             cnt_mem_map_dmabuf;
        u32             cnt_mem_unmap_dmabuf;
        u32             cnt_mem_vaddr;
        u32             cnt_mem_cookie;
        u32             cnt_mem_num_users;
        u32             cnt_mem_mmap;

        u32             cnt_buf_init;
        u32             cnt_buf_prepare;
        u32             cnt_buf_finish;
        u32             cnt_buf_cleanup;
        u32             cnt_buf_queue;

        /* This counts the number of calls to vb2_buffer_done() */
        u32             cnt_buf_done;
#endif
};

/**
 * struct vb2_ops - driver-specific callbacks
 *
 * @queue_setup:        called from VIDIOC_REQBUFS and VIDIOC_CREATE_BUFS
 *                      handlers before memory allocation, or, if
 *                      *num_planes != 0, after the allocation to verify a
 *                      smaller number of buffers. Driver should return
 *                      the required number of buffers in *num_buffers, the
 *                      required number of planes per buffer in *num_planes; the
 *                      size of each plane should be set in the sizes[] array
 *                      and optional per-plane allocator specific context in the
 *                      alloc_ctxs[] array. When called from VIDIOC_REQBUFS,
 *                      fmt == NULL, the driver has to use the currently
 *                      configured format and *num_buffers is the total number
 *                      of buffers, that are being allocated. When called from
 *                      VIDIOC_CREATE_BUFS, fmt != NULL and it describes the
 *                      target frame format (if the format isn't valid the
 *                      callback must return -EINVAL). In this case *num_buffers
 *                      are being allocated additionally to q->num_buffers.
 * @wait_prepare:       release any locks taken while calling vb2 functions;
 *                      it is called before an ioctl needs to wait for a new
 *                      buffer to arrive; required to avoid a deadlock in
 *                      blocking access type.
 * @wait_finish:        reacquire all locks released in the previous callback;
 *                      required to continue operation after sleeping while
 *                      waiting for a new buffer to arrive.
 * @buf_init:           called once after allocating a buffer (in MMAP case)
 *                      or after acquiring a new USERPTR buffer; drivers may
 *                      perform additional buffer-related initialization;
 *                      initialization failure (return != 0) will prevent
 *                      queue setup from completing successfully; optional.
 * @buf_prepare:        called every time the buffer is queued from userspace
 *                      and from the VIDIOC_PREPARE_BUF ioctl; drivers may
 *                      perform any initialization required before each hardware
 *                      operation in this callback; drivers that support
 *                      VIDIOC_CREATE_BUFS must also validate the buffer size;
 *                      if an error is returned, the buffer will not be queued
 *                      in driver; optional.
 * @buf_finish:         called before every dequeue of the buffer back to
 *                      userspace; drivers may perform any operations required
 *                      before userspace accesses the buffer; optional. The
 *                      buffer state can be one of the following: DONE and
 *                      ERROR occur while streaming is in progress, and the
 *                      PREPARED state occurs when the queue has been canceled
 *                      and all pending buffers are being returned to their
 *                      default DEQUEUED state. Typically you only have to do
 *                      something if the state is VB2_BUF_STATE_DONE, since in
 *                      all other cases the buffer contents will be ignored
 *                      anyway.
 * @buf_cleanup:        called once before the buffer is freed; drivers may
 *                      perform any additional cleanup; optional.
 * @start_streaming:    called once to enter 'streaming' state; the driver may
 *                      receive buffers with @buf_queue callback before
 *                      @start_streaming is called; the driver gets the number
 *                      of already queued buffers in count parameter; driver
 *                      can return an error if hardware fails, in that case all
 *                      buffers that have been already given by the @buf_queue
 *                      callback are to be returned by the driver by calling
 *                      @vb2_buffer_done(VB2_BUF_STATE_QUEUED).
 *                      If you need a minimum number of buffers before you can
 *                      start streaming, then set @min_buffers_needed in the
 *                      vb2_queue structure. If that is non-zero then
 *                      start_streaming won't be called until at least that
 *                      many buffers have been queued up by userspace.
 * @stop_streaming:     called when 'streaming' state must be disabled; driver
 *                      should stop any DMA transactions or wait until they
 *                      finish and give back all buffers it got from buf_queue()
 *                      callback by calling @vb2_buffer_done() with either
 *                      VB2_BUF_STATE_DONE or VB2_BUF_STATE_ERROR; may use
 *                      vb2_wait_for_all_buffers() function
 * @buf_queue:          passes buffer vb to the driver; driver may start
 *                      hardware operation on this buffer; driver should give
 *                      the buffer back by calling vb2_buffer_done() function;
 *                      it is allways called after calling STREAMON ioctl;
 *                      might be called before start_streaming callback if user
 *                      pre-queued buffers before calling STREAMON.
 */
struct vb2_ops {
        int (*queue_setup)(struct vb2_queue *q, const struct v4l2_format *fmt,
                           unsigned int *num_buffers, unsigned int *num_planes,
                           unsigned int sizes[], void *alloc_ctxs[]);

        void (*wait_prepare)(struct vb2_queue *q);
        void (*wait_finish)(struct vb2_queue *q);

        int (*buf_init)(struct vb2_buffer *vb);
        int (*buf_prepare)(struct vb2_buffer *vb);
        void (*buf_finish)(struct vb2_buffer *vb);
        void (*buf_cleanup)(struct vb2_buffer *vb);

        int (*start_streaming)(struct vb2_queue *q, unsigned int count);
        void (*stop_streaming)(struct vb2_queue *q);

        void (*buf_queue)(struct vb2_buffer *vb);
};

struct v4l2_fh;

/**
 * struct vb2_queue - a videobuf queue
 *
 * @type:       queue type (see V4L2_BUF_TYPE_* in linux/videodev2.h
 * @io_modes:   supported io methods (see vb2_io_modes enum)
 * @io_flags:   additional io flags (see vb2_fileio_flags enum)
 * @lock:       pointer to a mutex that protects the vb2_queue struct. The
 *              driver can set this to a mutex to let the v4l2 core serialize
 *              the queuing ioctls. If the driver wants to handle locking
 *              itself, then this should be set to NULL. This lock is not used
 *              by the videobuf2 core API.
 * @owner:      The filehandle that 'owns' the buffers, i.e. the filehandle
 *              that called reqbufs, create_buffers or started fileio.
 *              This field is not used by the videobuf2 core API, but it allows
 *              drivers to easily associate an owner filehandle with the queue.
 * @ops:        driver-specific callbacks
 * @mem_ops:    memory allocator specific callbacks
 * @drv_priv:   driver private data
 * @buf_struct_size: size of the driver-specific buffer structure;
 *              "0" indicates the driver doesn't want to use a custom buffer
 *              structure type, so sizeof(struct vb2_buffer) will is used
 * @timestamp_flags: Timestamp flags; V4L2_BUF_FLAGS_TIMESTAMP_* and
 *              V4L2_BUF_FLAGS_TSTAMP_SRC_*
 * @gfp_flags:  additional gfp flags used when allocating the buffers.
 *              Typically this is 0, but it may be e.g. GFP_DMA or __GFP_DMA32
 *              to force the buffer allocation to a specific memory zone.
 * @min_buffers_needed: the minimum number of buffers needed before
 *              start_streaming() can be called. Used when a DMA engine
 *              cannot be started unless at least this number of buffers
 *              have been queued into the driver.
 *
 * @memory:     current memory type used
 * @bufs:       videobuf buffer structures
 * @num_buffers: number of allocated/used buffers
 * @queued_list: list of buffers currently queued from userspace
 * @queued_count: number of buffers queued and ready for streaming.
 * @owned_by_drv_count: number of buffers owned by the driver
 * @done_list:  list of buffers ready to be dequeued to userspace
 * @done_lock:  lock to protect done_list list
 * @done_wq:    waitqueue for processes waiting for buffers ready to be dequeued
 * @alloc_ctx:  memory type/allocator-specific contexts for each plane
 * @streaming:  current streaming state
 * @start_streaming_called: start_streaming() was called successfully and we
 *              started streaming.
 * @error:      a fatal error occurred on the queue
 * @waiting_for_buffers: used in poll() to check if vb2 is still waiting for
 *              buffers. Only set for capture queues if qbuf has not yet been
 *              called since poll() needs to return POLLERR in that situation.
 * @fileio:     file io emulator internal data, used only if emulator is active
 * @threadio:   thread io internal data, used only if thread is active
 */
struct vb2_queue {
        enum v4l2_buf_type              type;
        unsigned int                    io_modes;
        unsigned int                    io_flags;
        struct mutex                    *lock;
        struct v4l2_fh                  *owner;

        const struct vb2_ops            *ops;
        const struct vb2_mem_ops        *mem_ops;
        void                            *drv_priv;
        unsigned int                    buf_struct_size;
        u32                             timestamp_flags;
        gfp_t                           gfp_flags;
        u32                             min_buffers_needed;

/* private: internal use only */
        enum v4l2_memory                memory;
        struct vb2_buffer               *bufs[VIDEO_MAX_FRAME];
        unsigned int                    num_buffers;

        struct list_head                queued_list;
        unsigned int                    queued_count;

        atomic_t                        owned_by_drv_count;
        struct list_head                done_list;
        spinlock_t                      done_lock;
        wait_queue_head_t               done_wq;

        void                            *alloc_ctx[VIDEO_MAX_PLANES];
        unsigned int                    plane_sizes[VIDEO_MAX_PLANES];

        unsigned int                    streaming:1;
        unsigned int                    start_streaming_called:1;
        unsigned int                    error:1;
        unsigned int                    waiting_for_buffers:1;

        struct vb2_fileio_data          *fileio;
        struct vb2_threadio_data        *threadio;

#ifdef CONFIG_VIDEO_ADV_DEBUG
        /*
         * Counters for how often these queue-related ops are
         * called. Used to check for unbalanced ops.
         */
        u32                             cnt_queue_setup;
        u32                             cnt_wait_prepare;
        u32                             cnt_wait_finish;
        u32                             cnt_start_streaming;
        u32                             cnt_stop_streaming;
#endif
};

void *vb2_plane_vaddr(struct vb2_buffer *vb, unsigned int plane_no);
void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no);

void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state);
void vb2_discard_done(struct vb2_queue *q);
int vb2_wait_for_all_buffers(struct vb2_queue *q);

int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b);
int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req);

int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create);
int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b);

int __must_check vb2_queue_init(struct vb2_queue *q);

void vb2_queue_release(struct vb2_queue *q);
void vb2_queue_error(struct vb2_queue *q);

int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b);
int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb);
int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking);

int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type);
int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type);

int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma);
#ifndef CONFIG_MMU
unsigned long vb2_get_unmapped_area(struct vb2_queue *q,
                                    unsigned long addr,
                                    unsigned long len,
                                    unsigned long pgoff,
                                    unsigned long flags);
#endif
unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait);
size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count,
                loff_t *ppos, int nonblock);
size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count,
                loff_t *ppos, int nonblock);
/**
 * vb2_thread_fnc - callback function for use with vb2_thread
 *
 * This is called whenever a buffer is dequeued in the thread.
 */
typedef int (*vb2_thread_fnc)(struct vb2_buffer *vb, void *priv);

/**
 * vb2_thread_start() - start a thread for the given queue.
 * @q:          videobuf queue
 * @fnc:        callback function
 * @priv:       priv pointer passed to the callback function
 * @thread_name:the name of the thread. This will be prefixed with "vb2-".
 *
 * This starts a thread that will queue and dequeue until an error occurs
 * or @vb2_thread_stop is called.
 *
 * This function should not be used for anything else but the videobuf2-dvb
 * support. If you think you have another good use-case for this, then please
 * contact the linux-media mailinglist first.
 */
int vb2_thread_start(struct vb2_queue *q, vb2_thread_fnc fnc, void *priv,
                     const char *thread_name);

/**
 * vb2_thread_stop() - stop the thread for the given queue.
 * @q:          videobuf queue
 */
int vb2_thread_stop(struct vb2_queue *q);

/**
 * vb2_is_streaming() - return streaming status of the queue
 * @q:          videobuf queue
 */
static inline bool vb2_is_streaming(struct vb2_queue *q)
{
        return q->streaming;
}

/**
 * vb2_fileio_is_active() - return true if fileio is active.
 * @q:          videobuf queue
 *
 * This returns true if read() or write() is used to stream the data
 * as opposed to stream I/O. This is almost never an important distinction,
 * except in rare cases. One such case is that using read() or write() to
 * stream a format using V4L2_FIELD_ALTERNATE is not allowed since there
 * is no way you can pass the field information of each buffer to/from
 * userspace. A driver that supports this field format should check for
 * this in the queue_setup op and reject it if this function returns true.
 */
static inline bool vb2_fileio_is_active(struct vb2_queue *q)
{
        return q->fileio;
}

/**
 * vb2_is_busy() - return busy status of the queue
 * @q:          videobuf queue
 *
 * This function checks if queue has any buffers allocated.
 */
static inline bool vb2_is_busy(struct vb2_queue *q)
{
        return (q->num_buffers > 0);
}

/**
 * vb2_get_drv_priv() - return driver private data associated with the queue
 * @q:          videobuf queue
 */
static inline void *vb2_get_drv_priv(struct vb2_queue *q)
{
        return q->drv_priv;
}

/**
 * vb2_set_plane_payload() - set bytesused for the plane plane_no
 * @vb:         buffer for which plane payload should be set
 * @plane_no:   plane number for which payload should be set
 * @size:       payload in bytes
 */
static inline void vb2_set_plane_payload(struct vb2_buffer *vb,
                                 unsigned int plane_no, unsigned long size)
{
        if (plane_no < vb->num_planes)
                vb->v4l2_planes[plane_no].bytesused = size;
}

/**
 * vb2_get_plane_payload() - get bytesused for the plane plane_no
 * @vb:         buffer for which plane payload should be set
 * @plane_no:   plane number for which payload should be set
 * @size:       payload in bytes
 */
static inline unsigned long vb2_get_plane_payload(struct vb2_buffer *vb,
                                 unsigned int plane_no)
{
        if (plane_no < vb->num_planes)
                return vb->v4l2_planes[plane_no].bytesused;
        return 0;
}

/**
 * vb2_plane_size() - return plane size in bytes
 * @vb:         buffer for which plane size should be returned
 * @plane_no:   plane number for which size should be returned
 */
static inline unsigned long
vb2_plane_size(struct vb2_buffer *vb, unsigned int plane_no)
{
        if (plane_no < vb->num_planes)
                return vb->v4l2_planes[plane_no].length;
        return 0;
}

/*
 * The following functions are not part of the vb2 core API, but are simple
 * helper functions that you can use in your struct v4l2_file_operations,
 * struct v4l2_ioctl_ops and struct vb2_ops. They will serialize if vb2_queue->lock
 * or video_device->lock is set, and they will set and test vb2_queue->owner
 * to check if the calling filehandle is permitted to do the queuing operation.
 */

/* struct v4l2_ioctl_ops helpers */

int vb2_ioctl_reqbufs(struct file *file, void *priv,
                          struct v4l2_requestbuffers *p);
int vb2_ioctl_create_bufs(struct file *file, void *priv,
                          struct v4l2_create_buffers *p);
int vb2_ioctl_prepare_buf(struct file *file, void *priv,
                          struct v4l2_buffer *p);
int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p);
int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p);
int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p);
int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i);
int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i);
int vb2_ioctl_expbuf(struct file *file, void *priv,
        struct v4l2_exportbuffer *p);

/* struct v4l2_file_operations helpers */

int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma);
int vb2_fop_release(struct file *file);
int _vb2_fop_release(struct file *file, struct mutex *lock);
ssize_t vb2_fop_write(struct file *file, const char __user *buf,
                size_t count, loff_t *ppos);
ssize_t vb2_fop_read(struct file *file, char __user *buf,
                size_t count, loff_t *ppos);
unsigned int vb2_fop_poll(struct file *file, poll_table *wait);
#ifndef CONFIG_MMU
unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr,
                unsigned long len, unsigned long pgoff, unsigned long flags);
#endif

/* struct vb2_ops helpers, only use if vq->lock is non-NULL. */

void vb2_ops_wait_prepare(struct vb2_queue *vq);
void vb2_ops_wait_finish(struct vb2_queue *vq);

#endif /* _MEDIA_VIDEOBUF2_CORE_H */