drivers/media/test-drivers/vimc/vimc-sensor.c

Source file repositories/reference/linux-study-clean/drivers/media/test-drivers/vimc/vimc-sensor.c

File Facts

System
Linux kernel
Corpus path
drivers/media/test-drivers/vimc/vimc-sensor.c
Extension
.c
Size
14458 bytes
Lines
508
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-or-later
/*
 * vimc-sensor.c Virtual Media Controller Driver
 *
 * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
 */

#include <linux/v4l2-mediabus.h>
#include <linux/vmalloc.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
#include <media/v4l2-subdev.h>
#include <media/tpg/v4l2-tpg.h>

#include "vimc-common.h"

static const struct v4l2_mbus_framefmt fmt_default = {
	.width = 640,
	.height = 480,
	.code = MEDIA_BUS_FMT_RGB888_1X24,
	.field = V4L2_FIELD_NONE,
	.colorspace = V4L2_COLORSPACE_SRGB,
};

static int vimc_sensor_init_state(struct v4l2_subdev *sd,
				  struct v4l2_subdev_state *sd_state)
{
	struct vimc_sensor_device *vsensor =
		container_of(sd, struct vimc_sensor_device, sd);

	struct v4l2_mbus_framefmt *mf;

	mf = v4l2_subdev_state_get_format(sd_state, 0);
	*mf = fmt_default;
	vsensor->hw.size.width = fmt_default.width;
	vsensor->hw.size.height = fmt_default.height;

	return 0;
}

static int vimc_sensor_enum_mbus_code(struct v4l2_subdev *sd,
				      struct v4l2_subdev_state *sd_state,
				      struct v4l2_subdev_mbus_code_enum *code)
{
	u32 mbus_code = vimc_mbus_code_by_index(code->index);

	if (!mbus_code)
		return -EINVAL;

	code->code = mbus_code;

	return 0;
}

static int vimc_sensor_enum_frame_size(struct v4l2_subdev *sd,
				       struct v4l2_subdev_state *sd_state,
				       struct v4l2_subdev_frame_size_enum *fse)
{
	const struct vimc_pix_map *vpix;

	if (fse->index)
		return -EINVAL;

	/* Only accept code in the pix map table */
	vpix = vimc_pix_map_by_code(fse->code);
	if (!vpix)
		return -EINVAL;

	fse->min_width = VIMC_FRAME_MIN_WIDTH;
	fse->max_width = VIMC_FRAME_MAX_WIDTH;
	fse->min_height = VIMC_FRAME_MIN_HEIGHT;
	fse->max_height = VIMC_FRAME_MAX_HEIGHT;

	return 0;
}

static void vimc_sensor_tpg_s_format(struct vimc_sensor_device *vsensor,
				     const struct v4l2_mbus_framefmt *format)
{
	const struct vimc_pix_map *vpix = vimc_pix_map_by_code(format->code);

	tpg_reset_source(&vsensor->tpg, format->width, format->height,
			 format->field);
	tpg_s_bytesperline(&vsensor->tpg, 0, format->width * vpix->bpp);
	tpg_s_buf_height(&vsensor->tpg, format->height);
	tpg_s_fourcc(&vsensor->tpg, vpix->pixelformat);
	/* TODO: add support for V4L2_FIELD_ALTERNATE */
	tpg_s_field(&vsensor->tpg, format->field, false);
	tpg_s_colorspace(&vsensor->tpg, format->colorspace);
	tpg_s_ycbcr_enc(&vsensor->tpg, format->ycbcr_enc);

Annotation

Implementation Notes