linux/drivers/media/platform/ti/omap/omap_vout_vrfb.c

/*
 * omap_vout_vrfb.c
 *
 * Copyright (C) 2010 Texas Instruments.
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 *
 */

#include <linux/sched.h>
#include <linux/platform_device.h>
#include <linux/videodev2.h>
#include <linux/slab.h>

#include <media/v4l2-device.h>

#include <video/omapvrfb.h>

#include "omap_voutdef.h"
#include "omap_voutlib.h"
#include "omap_vout_vrfb.h"

#define OMAP_DMA_NO_DEVICE …

/*
 * Function for allocating video buffers
 */
static int omap_vout_allocate_vrfb_buffers(struct omap_vout_device *vout,
		unsigned int *count, int startindex)
{ … }

/*
 * Wakes up the application once the DMA transfer to VRFB space is completed.
 */
static void omap_vout_vrfb_dma_tx_callback(void *data)
{ … }

/*
 * Free VRFB buffers
 */
void omap_vout_free_vrfb_buffers(struct omap_vout_device *vout)
{ … }

int omap_vout_setup_vrfb_bufs(struct platform_device *pdev, int vid_num,
			      bool static_vrfb_allocation)
{ … }

/*
 * Release the VRFB context once the module exits
 */
void omap_vout_release_vrfb(struct omap_vout_device *vout)
{ … }

/*
 * Allocate the buffers for the VRFB space.  Data is copied from V4L2
 * buffers to the VRFB buffers using the DMA engine.
 */
int omap_vout_vrfb_buffer_setup(struct omap_vout_device *vout,
			  unsigned int *count, unsigned int startindex)
{ … }

int omap_vout_prepare_vrfb(struct omap_vout_device *vout,
			   struct vb2_buffer *vb)
{ … }

/*
 * Calculate the buffer offsets from which the streaming should
 * start. This offset calculation is mainly required because of
 * the VRFB 32 pixels alignment with rotation.
 */
void omap_vout_calculate_vrfb_offset(struct omap_vout_device *vout)
{ … }