1. 根目录:
2. drivers
3. media
4. platform
5. vsp1
6. vsp1_entity.c

/*
 * vsp1_entity.c  --  R-Car VSP1 Base Entity
 *
 * Copyright (C) 2013-2014 Renesas Electronics Corporation
 *
 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.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; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/device.h>
#include <linux/gfp.h>

#include <media/media-entity.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-subdev.h>

#include "vsp1.h"
#include "vsp1_entity.h"
#include "vsp1_video.h"

bool vsp1_entity_is_streaming(struct vsp1_entity *entity)
{
	bool streaming;

	mutex_lock(&entity->lock);
	streaming = entity->streaming;
	mutex_unlock(&entity->lock);

	return streaming;
}

int vsp1_entity_set_streaming(struct vsp1_entity *entity, bool streaming)
{
	int ret;

	mutex_lock(&entity->lock);
	entity->streaming = streaming;
	mutex_unlock(&entity->lock);

	if (!streaming)
		return 0;

	if (!entity->subdev.ctrl_handler)
		return 0;

	ret = v4l2_ctrl_handler_setup(entity->subdev.ctrl_handler);
	if (ret < 0) {
		mutex_lock(&entity->lock);
		entity->streaming = false;
		mutex_unlock(&entity->lock);
	}

	return ret;
}

/* -----------------------------------------------------------------------------
 * V4L2 Subdevice Operations
 */

struct v4l2_mbus_framefmt *
vsp1_entity_get_pad_format(struct vsp1_entity *entity,
			   struct v4l2_subdev_fh *fh,
			   unsigned int pad, u32 which)
{
	switch (which) {
	case V4L2_SUBDEV_FORMAT_TRY:
		return v4l2_subdev_get_try_format(fh, pad);
	case V4L2_SUBDEV_FORMAT_ACTIVE:
		return &entity->formats[pad];
	default:
		return NULL;
	}
}

/*
 * vsp1_entity_init_formats - Initialize formats on all pads
 * @subdev: V4L2 subdevice
 * @fh: V4L2 subdev file handle
 *
 * Initialize all pad formats with default values. If fh is not NULL, try
 * formats are initialized on the file handle. Otherwise active formats are
 * initialized on the device.
 */
void vsp1_entity_init_formats(struct v4l2_subdev *subdev,
			    struct v4l2_subdev_fh *fh)
{
	struct v4l2_subdev_format format;
	unsigned int pad;

	for (pad = 0; pad < subdev->entity.num_pads - 1; ++pad) {
		memset(&format, 0, sizeof(format));

		format.pad = pad;
		format.which = fh ? V4L2_SUBDEV_FORMAT_TRY
			     : V4L2_SUBDEV_FORMAT_ACTIVE;

		v4l2_subdev_call(subdev, pad, set_fmt, fh, &format);
	}
}

static int vsp1_entity_open(struct v4l2_subdev *subdev,
			    struct v4l2_subdev_fh *fh)
{
	vsp1_entity_init_formats(subdev, fh);

	return 0;
}

const struct v4l2_subdev_internal_ops vsp1_subdev_internal_ops = {
	.open = vsp1_entity_open,
};

/* -----------------------------------------------------------------------------
 * Media Operations
 */

static int vsp1_entity_link_setup(struct media_entity *entity,
				  const struct media_pad *local,
				  const struct media_pad *remote, u32 flags)
{
	struct vsp1_entity *source;

	if (!(local->flags & MEDIA_PAD_FL_SOURCE))
		return 0;

	source = container_of(local->entity, struct vsp1_entity, subdev.entity);

	if (!source->route)
		return 0;

	if (flags & MEDIA_LNK_FL_ENABLED) {
		if (source->sink)
			return -EBUSY;
		source->sink = remote->entity;
		source->sink_pad = remote->index;
	} else {
		source->sink = NULL;
		source->sink_pad = 0;
	}

	return 0;
}

const struct media_entity_operations vsp1_media_ops = {
	.link_setup = vsp1_entity_link_setup,
	.link_validate = v4l2_subdev_link_validate,
};

/* -----------------------------------------------------------------------------
 * Initialization
 */

static const struct vsp1_route vsp1_routes[] = {
	{ VSP1_ENTITY_BRU, 0, VI6_DPR_BRU_ROUTE,
	  { VI6_DPR_NODE_BRU_IN(0), VI6_DPR_NODE_BRU_IN(1),
	    VI6_DPR_NODE_BRU_IN(2), VI6_DPR_NODE_BRU_IN(3), } },
	{ VSP1_ENTITY_HSI, 0, VI6_DPR_HSI_ROUTE, { VI6_DPR_NODE_HSI, } },
	{ VSP1_ENTITY_HST, 0, VI6_DPR_HST_ROUTE, { VI6_DPR_NODE_HST, } },
	{ VSP1_ENTITY_LIF, 0, 0, { VI6_DPR_NODE_LIF, } },
	{ VSP1_ENTITY_LUT, 0, VI6_DPR_LUT_ROUTE, { VI6_DPR_NODE_LUT, } },
	{ VSP1_ENTITY_RPF, 0, VI6_DPR_RPF_ROUTE(0), { VI6_DPR_NODE_RPF(0), } },
	{ VSP1_ENTITY_RPF, 1, VI6_DPR_RPF_ROUTE(1), { VI6_DPR_NODE_RPF(1), } },
	{ VSP1_ENTITY_RPF, 2, VI6_DPR_RPF_ROUTE(2), { VI6_DPR_NODE_RPF(2), } },
	{ VSP1_ENTITY_RPF, 3, VI6_DPR_RPF_ROUTE(3), { VI6_DPR_NODE_RPF(3), } },
	{ VSP1_ENTITY_RPF, 4, VI6_DPR_RPF_ROUTE(4), { VI6_DPR_NODE_RPF(4), } },
	{ VSP1_ENTITY_SRU, 0, VI6_DPR_SRU_ROUTE, { VI6_DPR_NODE_SRU, } },
	{ VSP1_ENTITY_UDS, 0, VI6_DPR_UDS_ROUTE(0), { VI6_DPR_NODE_UDS(0), } },
	{ VSP1_ENTITY_UDS, 1, VI6_DPR_UDS_ROUTE(1), { VI6_DPR_NODE_UDS(1), } },
	{ VSP1_ENTITY_UDS, 2, VI6_DPR_UDS_ROUTE(2), { VI6_DPR_NODE_UDS(2), } },
	{ VSP1_ENTITY_WPF, 0, 0, { VI6_DPR_NODE_WPF(0), } },
	{ VSP1_ENTITY_WPF, 1, 0, { VI6_DPR_NODE_WPF(1), } },
	{ VSP1_ENTITY_WPF, 2, 0, { VI6_DPR_NODE_WPF(2), } },
	{ VSP1_ENTITY_WPF, 3, 0, { VI6_DPR_NODE_WPF(3), } },
};

int vsp1_entity_init(struct vsp1_device *vsp1, struct vsp1_entity *entity,
		     unsigned int num_pads)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(vsp1_routes); ++i) {
		if (vsp1_routes[i].type == entity->type &&
		    vsp1_routes[i].index == entity->index) {
			entity->route = &vsp1_routes[i];
			break;
		}
	}

	if (i == ARRAY_SIZE(vsp1_routes))
		return -EINVAL;

	mutex_init(&entity->lock);

	entity->vsp1 = vsp1;
	entity->source_pad = num_pads - 1;

	/* Allocate formats and pads. */
	entity->formats = devm_kzalloc(vsp1->dev,
				       num_pads * sizeof(*entity->formats),
				       GFP_KERNEL);
	if (entity->formats == NULL)
		return -ENOMEM;

	entity->pads = devm_kzalloc(vsp1->dev, num_pads * sizeof(*entity->pads),
				    GFP_KERNEL);
	if (entity->pads == NULL)
		return -ENOMEM;

	/* Initialize pads. */
	for (i = 0; i < num_pads - 1; ++i)
		entity->pads[i].flags = MEDIA_PAD_FL_SINK;

	entity->pads[num_pads - 1].flags = MEDIA_PAD_FL_SOURCE;

	/* Initialize the media entity. */
	return media_entity_init(&entity->subdev.entity, num_pads,
				 entity->pads, 0);
}

void vsp1_entity_destroy(struct vsp1_entity *entity)
{
	if (entity->video)
		vsp1_video_cleanup(entity->video);
	if (entity->subdev.ctrl_handler)
		v4l2_ctrl_handler_free(entity->subdev.ctrl_handler);
	media_entity_cleanup(&entity->subdev.entity);

	mutex_destroy(&entity->lock);
}