drivers/media/platform/renesas/vsp1/vsp1_hsit.c

Source file repositories/reference/linux-study-clean/drivers/media/platform/renesas/vsp1/vsp1_hsit.c

File Facts

System
Linux kernel
Corpus path
drivers/media/platform/renesas/vsp1/vsp1_hsit.c
Extension
.c
Size
5999 bytes
Lines
234
Domain
Driver Families
Bucket
drivers/media
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0+
/*
 * vsp1_hsit.c  --  R-Car VSP1 Hue Saturation value (Inverse) Transform
 *
 * Copyright (C) 2013 Renesas Corporation
 *
 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
 */

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

#include <media/v4l2-subdev.h>

#include "vsp1.h"
#include "vsp1_dl.h"
#include "vsp1_entity.h"
#include "vsp1_hsit.h"

#define HSIT_MIN_SIZE				4U
#define HSIT_MAX_SIZE				8190U

/* -----------------------------------------------------------------------------
 * Device Access
 */

static inline void vsp1_hsit_write(struct vsp1_hsit *hsit,
				   struct vsp1_dl_body *dlb, u32 reg, u32 data)
{
	vsp1_dl_body_write(dlb, reg, data);
}

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

static const unsigned int hsit_codes[] = {
	MEDIA_BUS_FMT_ARGB8888_1X32,
	MEDIA_BUS_FMT_AHSV8888_1X32,
};

static int hsit_enum_mbus_code(struct v4l2_subdev *subdev,
			       struct v4l2_subdev_state *sd_state,
			       struct v4l2_subdev_mbus_code_enum *code)
{
	struct vsp1_hsit *hsit = to_hsit(subdev);

	if (code->index > 0)
		return -EINVAL;

	if ((code->pad == HSIT_PAD_SINK && !hsit->inverse) |
	    (code->pad == HSIT_PAD_SOURCE && hsit->inverse))
		code->code = MEDIA_BUS_FMT_ARGB8888_1X32;
	else
		code->code = MEDIA_BUS_FMT_AHSV8888_1X32;

	return 0;
}

static int hsit_enum_frame_size(struct v4l2_subdev *subdev,
				struct v4l2_subdev_state *sd_state,
				struct v4l2_subdev_frame_size_enum *fse)
{
	struct vsp1_entity *entity = to_vsp1_entity(subdev);
	struct vsp1_hsit *hsit = to_hsit(subdev);
	u32 code;

	if (fse->index)
		return -EINVAL;

	if ((fse->pad == HSIT_PAD_SINK && !hsit->inverse) |
	    (fse->pad == HSIT_PAD_SOURCE && hsit->inverse))
		code = MEDIA_BUS_FMT_ARGB8888_1X32;
	else
		code = MEDIA_BUS_FMT_AHSV8888_1X32;

	if (fse->code != code)
		return -EINVAL;

	if (fse->pad == 0) {
		fse->min_width = entity->min_width;
		fse->max_width = entity->max_width;
		fse->min_height = entity->min_height;
		fse->max_height = entity->max_height;
	} else {
		struct v4l2_subdev_state *state;
		struct v4l2_mbus_framefmt *format;

		state = vsp1_entity_get_state(entity, sd_state, fse->which);

Annotation

Implementation Notes