path: root/isp/subdev.c

/*
 * OMAP3 ISP library - V4L2 sub-devices
 *
 * Copyright (C) 2010-2011 Ideas on board SPRL
 *
 * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at
 * your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#include <linux/v4l2-subdev.h>

#include "media.h"
#include "subdev.h"
#include "tools.h"

static struct {
	const char *name;
	enum v4l2_mbus_pixelcode code;
} mbus_formats[] = {
	{ "YUYV", V4L2_MBUS_FMT_YUYV8_1X16 },
	{ "UYVY", V4L2_MBUS_FMT_UYVY8_1X16 },
	{ "SGRBG10", V4L2_MBUS_FMT_SGRBG10_1X10 },
	{ "SGRBG10_DPCM8", V4L2_MBUS_FMT_SGRBG10_DPCM8_1X8 },
};

static const char *pixelcode_to_string(enum v4l2_mbus_pixelcode code)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(mbus_formats); ++i) {
		if (mbus_formats[i].code == code)
			return mbus_formats[i].name;
	}

	return "unknown";
}

int v4l2_subdev_open(struct media_entity *entity)
{
	if (entity->fd != -1)
		return 0;

	entity->fd = open(entity->devname, O_RDWR);
	if (entity->fd == -1) {
		printf("%s: Failed to open subdev device node %s\n", __func__,
			entity->devname);
		return -errno;
	}

	return 0;
}

void v4l2_subdev_close(struct media_entity *entity)
{
	if (entity->fd == -1)
		return;

	close(entity->fd);
	entity->fd = -1;
}

int v4l2_subdev_get_format(struct media_entity *entity,
	struct v4l2_mbus_framefmt *format, unsigned int pad,
	enum v4l2_subdev_format_whence which)
{
	struct v4l2_subdev_format fmt;
	int ret;

	ret = v4l2_subdev_open(entity);
	if (ret < 0)
		return ret;

	memset(&fmt, 0, sizeof(fmt));
	fmt.pad = pad;
	fmt.which = which;

	ret = ioctl(entity->fd, VIDIOC_SUBDEV_G_FMT, &fmt);
	if (ret < 0)
		return -errno;

	*format = fmt.format;
	return 0;
}

int v4l2_subdev_set_format(struct media_entity *entity,
	struct v4l2_mbus_framefmt *format, unsigned int pad,
	enum v4l2_subdev_format_whence which)
{
	struct v4l2_subdev_format fmt;
	int ret;

	ret = v4l2_subdev_open(entity);
	if (ret < 0)
		return ret;

	memset(&fmt, 0, sizeof(fmt));
	fmt.pad = pad;
	fmt.which = which;
	fmt.format = *format;

	ret = ioctl(entity->fd, VIDIOC_SUBDEV_S_FMT, &fmt);
	if (ret < 0)
		return -errno;

	*format = fmt.format;
	return 0;
}

int v4l2_subdev_get_crop(struct media_entity *entity, struct v4l2_rect *rect,
			 unsigned int pad, enum v4l2_subdev_format_whence which)
{
	struct v4l2_subdev_crop crop;
	int ret;

	ret = v4l2_subdev_open(entity);
	if (ret < 0)
		return ret;

	memset(&crop, 0, sizeof(crop));
	crop.pad = pad;
	crop.which = which;

	ret = ioctl(entity->fd, VIDIOC_SUBDEV_G_CROP, &crop);
	if (ret < 0)
		return -errno;

	*rect = crop.rect;
	return 0;
}

int v4l2_subdev_set_crop(struct media_entity *entity, struct v4l2_rect *rect,
			 unsigned int pad, enum v4l2_subdev_format_whence which)
{
	struct v4l2_subdev_crop crop;
	int ret;

	ret = v4l2_subdev_open(entity);
	if (ret < 0)
		return ret;

	memset(&crop, 0, sizeof(crop));
	crop.pad = pad;
	crop.which = which;
	crop.rect = *rect;

	ret = ioctl(entity->fd, VIDIOC_SUBDEV_S_CROP, &crop);
	if (ret < 0)
		return -errno;

	*rect = crop.rect;
	return 0;
}

int v4l2_subdev_set_frame_interval(struct media_entity *entity,
				   struct v4l2_fract *interval)
{
	struct v4l2_subdev_frame_interval ival;
	int ret;

	ret = v4l2_subdev_open(entity);
	if (ret < 0)
		return ret;

	memset(&ival, 0, sizeof(ival));
	ival.interval = *interval;

	ret = ioctl(entity->fd, VIDIOC_SUBDEV_S_FRAME_INTERVAL, &ival);
	if (ret < 0)
		return -errno;

	*interval = ival.interval;
	return 0;
}

/* -----------------------------------------------------------------------------
 * Controls
 */

int v4l2_subdev_get_control(struct media_entity *entity, unsigned int id,
			    int32_t *value)
{
	struct v4l2_control ctrl;
	int ret;

	ret = v4l2_subdev_open(entity);
	if (ret < 0)
		return ret;

	ctrl.id = id;

	ret = ioctl(entity->fd, VIDIOC_G_CTRL, &ctrl);
	if (ret < 0) {
		printf("unable to get control: %s (%d).\n",
			strerror(errno), errno);
		return -errno;
	}

	*value = ctrl.value;
	return 0;
}

int v4l2_subdev_set_control(struct media_entity *entity, unsigned int id,
			    int32_t *value)
{
	struct v4l2_control ctrl;
	int ret;

	ret = v4l2_subdev_open(entity);
	if (ret < 0)
		return ret;

	ctrl.id = id;
	ctrl.value = *value;

	ret = ioctl(entity->fd, VIDIOC_S_CTRL, &ctrl);
	if (ret < 0) {
		printf("unable to set control: %s (%d).\n",
			strerror(errno), errno);
		return -errno;
	}

	*value = ctrl.value;
	return 0;
}

int v4l2_subdev_get_controls(struct media_entity *entity, unsigned int count,
			     struct v4l2_ext_control *ctrls)
{
	struct v4l2_ext_controls controls;
	int ret;

	ret = v4l2_subdev_open(entity);
	if (ret < 0)
		return ret;

	memset(&controls, 0, sizeof controls);
	controls.count = count;
	controls.controls = ctrls;

	ret = ioctl(entity->fd, VIDIOC_G_EXT_CTRLS, &controls);
	if (ret < 0)
		printf("unable to get multiple controls: %s (%d).\n",
			strerror(errno), errno);

	return ret;
}

int v4l2_subdev_set_controls(struct media_entity *entity, unsigned int count,
			     struct v4l2_ext_control *ctrls)
{
	struct v4l2_ext_controls controls;
	int ret;

	ret = v4l2_subdev_open(entity);
	if (ret < 0)
		return ret;

	memset(&controls, 0, sizeof controls);
	controls.count = count;
	controls.controls = ctrls;

	ret = ioctl(entity->fd, VIDIOC_S_EXT_CTRLS, &controls);
	if (ret < 0)
		printf("unable to set multiple controls: %s (%d).\n",
			strerror(errno), errno);

	return ret;
}