linux/drivers/media/pci/ivtv/ivtv-queue.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
    buffer queues.
    Copyright (C) 2003-2004  Kevin Thayer <nufan_wfk at yahoo.com>
    Copyright (C) 2004  Chris Kennedy <[email protected]>
    Copyright (C) 2005-2007  Hans Verkuil <[email protected]>

 */

#ifndef IVTV_QUEUE_H
#define IVTV_QUEUE_H

#define IVTV_DMA_UNMAPPED …
#define SLICED_VBI_PIO …

/* ivtv_buffer utility functions */

static inline int ivtv_might_use_pio(struct ivtv_stream *s)
{ … }

static inline int ivtv_use_pio(struct ivtv_stream *s)
{ … }

static inline int ivtv_might_use_dma(struct ivtv_stream *s)
{ … }

static inline int ivtv_use_dma(struct ivtv_stream *s)
{ … }

static inline void ivtv_buf_sync_for_cpu(struct ivtv_stream *s, struct ivtv_buffer *buf)
{ … }

static inline void ivtv_buf_sync_for_device(struct ivtv_stream *s, struct ivtv_buffer *buf)
{ … }

int ivtv_buf_copy_from_user(struct ivtv_stream *s, struct ivtv_buffer *buf, const char __user *src, int copybytes);
void ivtv_buf_swap(struct ivtv_buffer *buf);

/* ivtv_queue utility functions */
void ivtv_queue_init(struct ivtv_queue *q);
void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q);
struct ivtv_buffer *ivtv_dequeue(struct ivtv_stream *s, struct ivtv_queue *q);
int ivtv_queue_move(struct ivtv_stream *s, struct ivtv_queue *from, struct ivtv_queue *steal,
		    struct ivtv_queue *to, int needed_bytes);
void ivtv_flush_queues(struct ivtv_stream *s);

/* ivtv_stream utility functions */
int ivtv_stream_alloc(struct ivtv_stream *s);
void ivtv_stream_free(struct ivtv_stream *s);

static inline void ivtv_stream_sync_for_cpu(struct ivtv_stream *s)
{ … }

static inline void ivtv_stream_sync_for_device(struct ivtv_stream *s)
{ … }

#endif