soc_camera_platform.c

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/*
 * Generic Platform Camera Driver
 *
 * Copyright (C) 2008 Magnus Damm
 * Based on mt9m001 driver,
 * Copyright (C) 2008, Guennadi Liakhovetski <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/videodev2.h>
#include <media/v4l2-subdev.h>
#include <media/soc_camera.h>
#include <media/soc_camera_platform.h>

struct soc_camera_platform_priv {
    struct v4l2_subdev subdev;
};

static struct soc_camera_platform_priv *get_priv(struct platform_device *pdev)
{
    struct v4l2_subdev *subdev = platform_get_drvdata(pdev);
    return container_of(subdev, struct soc_camera_platform_priv, subdev);
}

static int soc_camera_platform_s_stream(struct v4l2_subdev *sd, int enable)
{
    struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
    return p->set_capture(p, enable);
}

static int soc_camera_platform_fill_fmt(struct v4l2_subdev *sd,
                    struct v4l2_mbus_framefmt *mf)
{
    struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);

    mf->width   = p->format.width;
    mf->height  = p->format.height;
    mf->code    = p->format.code;
    mf->colorspace  = p->format.colorspace;
    mf->field   = p->format.field;

    return 0;
}

static int soc_camera_platform_s_power(struct v4l2_subdev *sd, int on)
{
    struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);

    return soc_camera_set_power(p->icd->control, p->icd->link, on);
}

static struct v4l2_subdev_core_ops platform_subdev_core_ops = {
    .s_power = soc_camera_platform_s_power,
};

static int soc_camera_platform_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
                    enum v4l2_mbus_pixelcode *code)
{
    struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);

    if (index)
        return -EINVAL;

    *code = p->format.code;
    return 0;
}

static int soc_camera_platform_g_crop(struct v4l2_subdev *sd,
                      struct v4l2_crop *a)
{
    struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);

    a->c.left   = 0;
    a->c.top    = 0;
    a->c.width  = p->format.width;
    a->c.height = p->format.height;
    a->type     = V4L2_BUF_TYPE_VIDEO_CAPTURE;

    return 0;
}

static int soc_camera_platform_cropcap(struct v4l2_subdev *sd,
                       struct v4l2_cropcap *a)
{
    struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);

    a->bounds.left          = 0;
    a->bounds.top           = 0;
    a->bounds.width         = p->format.width;
    a->bounds.height        = p->format.height;
    a->defrect          = a->bounds;
    a->type             = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    a->pixelaspect.numerator    = 1;
    a->pixelaspect.denominator  = 1;

    return 0;
}

static int soc_camera_platform_g_mbus_config(struct v4l2_subdev *sd,
                         struct v4l2_mbus_config *cfg)
{
    struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);

    cfg->flags = p->mbus_param;
    cfg->type = p->mbus_type;

    return 0;
}

static struct v4l2_subdev_video_ops platform_subdev_video_ops = {
    .s_stream   = soc_camera_platform_s_stream,
    .enum_mbus_fmt  = soc_camera_platform_enum_fmt,
    .cropcap    = soc_camera_platform_cropcap,
    .g_crop     = soc_camera_platform_g_crop,
    .try_mbus_fmt   = soc_camera_platform_fill_fmt,
    .g_mbus_fmt = soc_camera_platform_fill_fmt,
    .s_mbus_fmt = soc_camera_platform_fill_fmt,
    .g_mbus_config  = soc_camera_platform_g_mbus_config,
};

static struct v4l2_subdev_ops platform_subdev_ops = {
    .core   = &platform_subdev_core_ops,
    .video  = &platform_subdev_video_ops,
};

static int soc_camera_platform_probe(struct platform_device *pdev)
{
    struct soc_camera_host *ici;
    struct soc_camera_platform_priv *priv;
    struct soc_camera_platform_info *p = pdev->dev.platform_data;
    struct soc_camera_device *icd;
    int ret;

    if (!p)
        return -EINVAL;

    if (!p->icd) {
        dev_err(&pdev->dev,
            "Platform has not set soc_camera_device pointer!\n");
        return -EINVAL;
    }

    priv = kzalloc(sizeof(*priv), GFP_KERNEL);
    if (!priv)
        return -ENOMEM;

    icd = p->icd;

    /* soc-camera convention: control's drvdata points to the subdev */
    platform_set_drvdata(pdev, &priv->subdev);
    /* Set the control device reference */
    icd->control = &pdev->dev;

    ici = to_soc_camera_host(icd->parent);

    v4l2_subdev_init(&priv->subdev, &platform_subdev_ops);
    v4l2_set_subdevdata(&priv->subdev, p);
    strncpy(priv->subdev.name, dev_name(&pdev->dev), V4L2_SUBDEV_NAME_SIZE);

    ret = v4l2_device_register_subdev(&ici->v4l2_dev, &priv->subdev);
    if (ret)
        goto evdrs;

    return ret;

evdrs:
    platform_set_drvdata(pdev, NULL);
    kfree(priv);
    return ret;
}

static int soc_camera_platform_remove(struct platform_device *pdev)
{
    struct soc_camera_platform_priv *priv = get_priv(pdev);
    struct soc_camera_platform_info *p = v4l2_get_subdevdata(&priv->subdev);

    p->icd->control = NULL;
    v4l2_device_unregister_subdev(&priv->subdev);
    platform_set_drvdata(pdev, NULL);
    kfree(priv);
    return 0;
}

static struct platform_driver soc_camera_platform_driver = {
    .driver     = {
        .name   = "soc_camera_platform",
        .owner  = THIS_MODULE,
    },
    .probe      = soc_camera_platform_probe,
    .remove     = soc_camera_platform_remove,
};

module_platform_driver(soc_camera_platform_driver);

MODULE_DESCRIPTION("SoC Camera Platform driver");
MODULE_AUTHOR("Magnus Damm");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:soc_camera_platform");