include/media/videobuf-dma-contig.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * helper functions for physically contiguous capture buffers
   4  *
   5  * The functions support hardware lacking scatter gather support
   6  * (i.e. the buffers must be linear in physical memory)
   7  *
   8  * Copyright (c) 2008 Magnus Damm
   9  */
  10 #ifndef _VIDEOBUF_DMA_CONTIG_H
  11 #define _VIDEOBUF_DMA_CONTIG_H
  12
  13 #include <linux/dma-mapping.h>
  14 #include <media/videobuf-core.h>
  15
  16 void videobuf_queue_dma_contig_init(struct videobuf_queue *q,
  17                                     const struct videobuf_queue_ops *ops,
  18                                     struct device *dev,
  19                                     spinlock_t *irqlock,
  20                                     enum v4l2_buf_type type,
  21                                     enum v4l2_field field,
  22                                     unsigned int msize,
  23                                     void *priv,
  24                                     struct mutex *ext_lock);
  25
  26 dma_addr_t videobuf_to_dma_contig(struct videobuf_buffer *buf);
  27 void videobuf_dma_contig_free(struct videobuf_queue *q,
  28                               struct videobuf_buffer *buf);
  29
  30 #endif /* _VIDEOBUF_DMA_CONTIG_H */