soc_camera.c

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/*
 * camera image capture (abstract) bus driver
 *
 * Copyright (C) 2008, Guennadi Liakhovetski <[email protected]>
 *
 * This driver provides an interface between platform-specific camera
 * busses and camera devices. It should be used if the camera is
 * connected not over a "proper" bus like PCI or USB, but over a
 * special bus, like, for example, the Quick Capture interface on PXA270
 * SoCs. Later it should also be used for i.MX31 SoCs from Freescale.
 * It can handle multiple cameras and / or multiple busses, which can
 * be used, e.g., in stereo-vision applications.
 *
 * 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/device.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/vmalloc.h>

#include <media/soc_camera.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-dev.h>
#include <media/videobuf-core.h>
#include <media/videobuf2-core.h>
#include <media/soc_mediabus.h>

/* Default to VGA resolution */
#define DEFAULT_WIDTH   640
#define DEFAULT_HEIGHT  480

#define is_streaming(ici, icd)              \
    (((ici)->ops->init_videobuf) ?          \
     (icd)->vb_vidq.streaming :         \
     vb2_is_streaming(&(icd)->vb2_vidq))

static LIST_HEAD(hosts);
static LIST_HEAD(devices);
static DEFINE_MUTEX(list_lock);     /* Protects the list of hosts */

int soc_camera_power_on(struct device *dev, struct soc_camera_link *icl)
{
    int ret = regulator_bulk_enable(icl->num_regulators,
                    icl->regulators);
    if (ret < 0) {
        dev_err(dev, "Cannot enable regulators\n");
        return ret;
    }

    if (icl->power) {
        ret = icl->power(dev, 1);
        if (ret < 0) {
            dev_err(dev,
                "Platform failed to power-on the camera.\n");
            regulator_bulk_disable(icl->num_regulators,
                           icl->regulators);
        }
    }

    return ret;
}
EXPORT_SYMBOL(soc_camera_power_on);

int soc_camera_power_off(struct device *dev, struct soc_camera_link *icl)
{
    int ret = 0;
    int err;

    if (icl->power) {
        err = icl->power(dev, 0);
        if (err < 0) {
            dev_err(dev,
                "Platform failed to power-off the camera.\n");
            ret = err;
        }
    }

    err = regulator_bulk_disable(icl->num_regulators,
                     icl->regulators);
    if (err < 0) {
        dev_err(dev, "Cannot disable regulators\n");
        ret = ret ? : err;
    }

    return ret;
}
EXPORT_SYMBOL(soc_camera_power_off);

static int __soc_camera_power_on(struct soc_camera_device *icd)
{
    struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
    int ret;

    ret = v4l2_subdev_call(sd, core, s_power, 1);
    if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
        return ret;

    return 0;
}

static int __soc_camera_power_off(struct soc_camera_device *icd)
{
    struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
    int ret;

    ret = v4l2_subdev_call(sd, core, s_power, 0);
    if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
        return ret;

    return 0;
}

const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
    struct soc_camera_device *icd, unsigned int fourcc)
{
    unsigned int i;

    for (i = 0; i < icd->num_user_formats; i++)
        if (icd->user_formats[i].host_fmt->fourcc == fourcc)
            return icd->user_formats + i;
    return NULL;
}
EXPORT_SYMBOL(soc_camera_xlate_by_fourcc);

unsigned long soc_camera_apply_board_flags(struct soc_camera_link *icl,
                       const struct v4l2_mbus_config *cfg)
{
    unsigned long f, flags = cfg->flags;

    /* If only one of the two polarities is supported, switch to the opposite */
    if (icl->flags & SOCAM_SENSOR_INVERT_HSYNC) {
        f = flags & (V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_LOW);
        if (f == V4L2_MBUS_HSYNC_ACTIVE_HIGH || f == V4L2_MBUS_HSYNC_ACTIVE_LOW)
            flags ^= V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_LOW;
    }

    if (icl->flags & SOCAM_SENSOR_INVERT_VSYNC) {
        f = flags & (V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW);
        if (f == V4L2_MBUS_VSYNC_ACTIVE_HIGH || f == V4L2_MBUS_VSYNC_ACTIVE_LOW)
            flags ^= V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW;
    }

    if (icl->flags & SOCAM_SENSOR_INVERT_PCLK) {
        f = flags & (V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING);
        if (f == V4L2_MBUS_PCLK_SAMPLE_RISING || f == V4L2_MBUS_PCLK_SAMPLE_FALLING)
            flags ^= V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING;
    }

    return flags;
}
EXPORT_SYMBOL(soc_camera_apply_board_flags);

#define pixfmtstr(x) (x) & 0xff, ((x) >> 8) & 0xff, ((x) >> 16) & 0xff, \
    ((x) >> 24) & 0xff

static int soc_camera_try_fmt(struct soc_camera_device *icd,
                  struct v4l2_format *f)
{
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
    const struct soc_camera_format_xlate *xlate;
    struct v4l2_pix_format *pix = &f->fmt.pix;
    int ret;

    dev_dbg(icd->pdev, "TRY_FMT(%c%c%c%c, %ux%u)\n",
        pixfmtstr(pix->pixelformat), pix->width, pix->height);

    if (pix->pixelformat != V4L2_PIX_FMT_JPEG &&
        !(ici->capabilities & SOCAM_HOST_CAP_STRIDE)) {
        pix->bytesperline = 0;
        pix->sizeimage = 0;
    }

    ret = ici->ops->try_fmt(icd, f);
    if (ret < 0)
        return ret;

    xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
    if (!xlate)
        return -EINVAL;

    ret = soc_mbus_bytes_per_line(pix->width, xlate->host_fmt);
    if (ret < 0)
        return ret;

    pix->bytesperline = max_t(u32, pix->bytesperline, ret);

    ret = soc_mbus_image_size(xlate->host_fmt, pix->bytesperline,
                  pix->height);
    if (ret < 0)
        return ret;

    pix->sizeimage = max_t(u32, pix->sizeimage, ret);

    return 0;
}

static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
                      struct v4l2_format *f)
{
    struct soc_camera_device *icd = file->private_data;

    WARN_ON(priv != file->private_data);

    /* Only single-plane capture is supported so far */
    if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
        return -EINVAL;

    /* limit format to hardware capabilities */
    return soc_camera_try_fmt(icd, f);
}

static int soc_camera_enum_input(struct file *file, void *priv,
                 struct v4l2_input *inp)
{
    if (inp->index != 0)
        return -EINVAL;

    /* default is camera */
    inp->type = V4L2_INPUT_TYPE_CAMERA;
    inp->std  = V4L2_STD_UNKNOWN;
    strcpy(inp->name, "Camera");

    return 0;
}

static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i)
{
    *i = 0;

    return 0;
}

static int soc_camera_s_input(struct file *file, void *priv, unsigned int i)
{
    if (i > 0)
        return -EINVAL;

    return 0;
}

static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id *a)
{
    struct soc_camera_device *icd = file->private_data;
    struct v4l2_subdev *sd = soc_camera_to_subdev(icd);

    return v4l2_subdev_call(sd, core, s_std, *a);
}

static int soc_camera_g_std(struct file *file, void *priv, v4l2_std_id *a)
{
    struct soc_camera_device *icd = file->private_data;
    struct v4l2_subdev *sd = soc_camera_to_subdev(icd);

    return v4l2_subdev_call(sd, core, g_std, a);
}

static int soc_camera_enum_framesizes(struct file *file, void *fh,
                     struct v4l2_frmsizeenum *fsize)
{
    struct soc_camera_device *icd = file->private_data;
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);

    return ici->ops->enum_framesizes(icd, fsize);
}

static int soc_camera_reqbufs(struct file *file, void *priv,
                  struct v4l2_requestbuffers *p)
{
    int ret;
    struct soc_camera_device *icd = file->private_data;
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);

    WARN_ON(priv != file->private_data);

    if (icd->streamer && icd->streamer != file)
        return -EBUSY;

    if (ici->ops->init_videobuf) {
        ret = videobuf_reqbufs(&icd->vb_vidq, p);
        if (ret < 0)
            return ret;

        ret = ici->ops->reqbufs(icd, p);
    } else {
        ret = vb2_reqbufs(&icd->vb2_vidq, p);
    }

    if (!ret && !icd->streamer)
        icd->streamer = file;

    return ret;
}

static int soc_camera_querybuf(struct file *file, void *priv,
                   struct v4l2_buffer *p)
{
    struct soc_camera_device *icd = file->private_data;
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);

    WARN_ON(priv != file->private_data);

    if (ici->ops->init_videobuf)
        return videobuf_querybuf(&icd->vb_vidq, p);
    else
        return vb2_querybuf(&icd->vb2_vidq, p);
}

static int soc_camera_qbuf(struct file *file, void *priv,
               struct v4l2_buffer *p)
{
    struct soc_camera_device *icd = file->private_data;
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);

    WARN_ON(priv != file->private_data);

    if (icd->streamer != file)
        return -EBUSY;

    if (ici->ops->init_videobuf)
        return videobuf_qbuf(&icd->vb_vidq, p);
    else
        return vb2_qbuf(&icd->vb2_vidq, p);
}

static int soc_camera_dqbuf(struct file *file, void *priv,
                struct v4l2_buffer *p)
{
    struct soc_camera_device *icd = file->private_data;
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);

    WARN_ON(priv != file->private_data);

    if (icd->streamer != file)
        return -EBUSY;

    if (ici->ops->init_videobuf)
        return videobuf_dqbuf(&icd->vb_vidq, p, file->f_flags & O_NONBLOCK);
    else
        return vb2_dqbuf(&icd->vb2_vidq, p, file->f_flags & O_NONBLOCK);
}

static int soc_camera_create_bufs(struct file *file, void *priv,
                struct v4l2_create_buffers *create)
{
    struct soc_camera_device *icd = file->private_data;
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);

    /* videobuf2 only */
    if (ici->ops->init_videobuf)
        return -EINVAL;
    else
        return vb2_create_bufs(&icd->vb2_vidq, create);
}

static int soc_camera_prepare_buf(struct file *file, void *priv,
                  struct v4l2_buffer *b)
{
    struct soc_camera_device *icd = file->private_data;
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);

    /* videobuf2 only */
    if (ici->ops->init_videobuf)
        return -EINVAL;
    else
        return vb2_prepare_buf(&icd->vb2_vidq, b);
}

/* Always entered with .video_lock held */
static int soc_camera_init_user_formats(struct soc_camera_device *icd)
{
    struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
    unsigned int i, fmts = 0, raw_fmts = 0;
    int ret;
    enum v4l2_mbus_pixelcode code;

    while (!v4l2_subdev_call(sd, video, enum_mbus_fmt, raw_fmts, &code))
        raw_fmts++;

    if (!ici->ops->get_formats)
        /*
         * Fallback mode - the host will have to serve all
         * sensor-provided formats one-to-one to the user
         */
        fmts = raw_fmts;
    else
        /*
         * First pass - only count formats this host-sensor
         * configuration can provide
         */
        for (i = 0; i < raw_fmts; i++) {
            ret = ici->ops->get_formats(icd, i, NULL);
            if (ret < 0)
                return ret;
            fmts += ret;
        }

    if (!fmts)
        return -ENXIO;

    icd->user_formats =
        vmalloc(fmts * sizeof(struct soc_camera_format_xlate));
    if (!icd->user_formats)
        return -ENOMEM;

    dev_dbg(icd->pdev, "Found %d supported formats.\n", fmts);

    /* Second pass - actually fill data formats */
    fmts = 0;
    for (i = 0; i < raw_fmts; i++)
        if (!ici->ops->get_formats) {
            v4l2_subdev_call(sd, video, enum_mbus_fmt, i, &code);
            icd->user_formats[fmts].host_fmt =
                soc_mbus_get_fmtdesc(code);
            if (icd->user_formats[fmts].host_fmt)
                icd->user_formats[fmts++].code = code;
        } else {
            ret = ici->ops->get_formats(icd, i,
                            &icd->user_formats[fmts]);
            if (ret < 0)
                goto egfmt;
            fmts += ret;
        }

    icd->num_user_formats = fmts;
    icd->current_fmt = &icd->user_formats[0];

    return 0;

egfmt:
    vfree(icd->user_formats);
    return ret;
}

/* Always entered with .video_lock held */
static void soc_camera_free_user_formats(struct soc_camera_device *icd)
{
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);

    if (ici->ops->put_formats)
        ici->ops->put_formats(icd);
    icd->current_fmt = NULL;
    icd->num_user_formats = 0;
    vfree(icd->user_formats);
    icd->user_formats = NULL;
}

/* Called with .vb_lock held, or from the first open(2), see comment there */
static int soc_camera_set_fmt(struct soc_camera_device *icd,
                  struct v4l2_format *f)
{
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
    struct v4l2_pix_format *pix = &f->fmt.pix;
    int ret;

    dev_dbg(icd->pdev, "S_FMT(%c%c%c%c, %ux%u)\n",
        pixfmtstr(pix->pixelformat), pix->width, pix->height);

    /* We always call try_fmt() before set_fmt() or set_crop() */
    ret = soc_camera_try_fmt(icd, f);
    if (ret < 0)
        return ret;

    ret = ici->ops->set_fmt(icd, f);
    if (ret < 0) {
        return ret;
    } else if (!icd->current_fmt ||
           icd->current_fmt->host_fmt->fourcc != pix->pixelformat) {
        dev_err(icd->pdev,
            "Host driver hasn't set up current format correctly!\n");
        return -EINVAL;
    }

    icd->user_width     = pix->width;
    icd->user_height    = pix->height;
    icd->bytesperline   = pix->bytesperline;
    icd->sizeimage      = pix->sizeimage;
    icd->colorspace     = pix->colorspace;
    icd->field      = pix->field;
    if (ici->ops->init_videobuf)
        icd->vb_vidq.field = pix->field;

    dev_dbg(icd->pdev, "set width: %d height: %d\n",
        icd->user_width, icd->user_height);

    /* set physical bus parameters */
    return ici->ops->set_bus_param(icd);
}

static int soc_camera_open(struct file *file)
{
    struct video_device *vdev = video_devdata(file);
    struct soc_camera_device *icd = dev_get_drvdata(vdev->parent);
    struct soc_camera_link *icl = to_soc_camera_link(icd);
    struct soc_camera_host *ici;
    int ret;

    if (!to_soc_camera_control(icd))
        /* No device driver attached */
        return -ENODEV;

    ici = to_soc_camera_host(icd->parent);

    if (mutex_lock_interruptible(&icd->video_lock))
        return -ERESTARTSYS;
    if (!try_module_get(ici->ops->owner)) {
        dev_err(icd->pdev, "Couldn't lock capture bus driver.\n");
        ret = -EINVAL;
        goto emodule;
    }

    icd->use_count++;

    /* Now we really have to activate the camera */
    if (icd->use_count == 1) {
        /* Restore parameters before the last close() per V4L2 API */
        struct v4l2_format f = {
            .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
            .fmt.pix = {
                .width      = icd->user_width,
                .height     = icd->user_height,
                .field      = icd->field,
                .colorspace = icd->colorspace,
                .pixelformat    =
                    icd->current_fmt->host_fmt->fourcc,
            },
        };

        /* The camera could have been already on, try to reset */
        if (icl->reset)
            icl->reset(icd->pdev);

        /* Don't mess with the host during probe */
        mutex_lock(&ici->host_lock);
        ret = ici->ops->add(icd);
        mutex_unlock(&ici->host_lock);
        if (ret < 0) {
            dev_err(icd->pdev, "Couldn't activate the camera: %d\n", ret);
            goto eiciadd;
        }

        ret = __soc_camera_power_on(icd);
        if (ret < 0)
            goto epower;

        pm_runtime_enable(&icd->vdev->dev);
        ret = pm_runtime_resume(&icd->vdev->dev);
        if (ret < 0 && ret != -ENOSYS)
            goto eresume;

        /*
         * Try to configure with default parameters. Notice: this is the
         * very first open, so, we cannot race against other calls,
         * apart from someone else calling open() simultaneously, but
         * .video_lock is protecting us against it.
         */
        ret = soc_camera_set_fmt(icd, &f);
        if (ret < 0)
            goto esfmt;

        if (ici->ops->init_videobuf) {
            ici->ops->init_videobuf(&icd->vb_vidq, icd);
        } else {
            ret = ici->ops->init_videobuf2(&icd->vb2_vidq, icd);
            if (ret < 0)
                goto einitvb;
        }
        v4l2_ctrl_handler_setup(&icd->ctrl_handler);
    }
    mutex_unlock(&icd->video_lock);

    file->private_data = icd;
    dev_dbg(icd->pdev, "camera device open\n");

    return 0;

    /*
     * First four errors are entered with the .video_lock held
     * and use_count == 1
     */
einitvb:
esfmt:
    pm_runtime_disable(&icd->vdev->dev);
eresume:
    __soc_camera_power_off(icd);
epower:
    ici->ops->remove(icd);
eiciadd:
    icd->use_count--;
    module_put(ici->ops->owner);
emodule:
    mutex_unlock(&icd->video_lock);

    return ret;
}

static int soc_camera_close(struct file *file)
{
    struct soc_camera_device *icd = file->private_data;
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);

    mutex_lock(&icd->video_lock);
    icd->use_count--;
    if (!icd->use_count) {
        pm_runtime_suspend(&icd->vdev->dev);
        pm_runtime_disable(&icd->vdev->dev);

        if (ici->ops->init_videobuf2)
            vb2_queue_release(&icd->vb2_vidq);
        ici->ops->remove(icd);

        __soc_camera_power_off(icd);
    }

    if (icd->streamer == file)
        icd->streamer = NULL;
    mutex_unlock(&icd->video_lock);

    module_put(ici->ops->owner);

    dev_dbg(icd->pdev, "camera device close\n");

    return 0;
}

static ssize_t soc_camera_read(struct file *file, char __user *buf,
                   size_t count, loff_t *ppos)
{
    struct soc_camera_device *icd = file->private_data;
    int err = -EINVAL;

    dev_err(icd->pdev, "camera device read not implemented\n");

    return err;
}

static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
{
    struct soc_camera_device *icd = file->private_data;
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
    int err;

    dev_dbg(icd->pdev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);

    if (icd->streamer != file)
        return -EBUSY;

    if (mutex_lock_interruptible(&icd->video_lock))
        return -ERESTARTSYS;
    if (ici->ops->init_videobuf)
        err = videobuf_mmap_mapper(&icd->vb_vidq, vma);
    else
        err = vb2_mmap(&icd->vb2_vidq, vma);
    mutex_unlock(&icd->video_lock);

    dev_dbg(icd->pdev, "vma start=0x%08lx, size=%ld, ret=%d\n",
        (unsigned long)vma->vm_start,
        (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
        err);

    return err;
}

static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
{
    struct soc_camera_device *icd = file->private_data;
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
    unsigned res = POLLERR;

    if (icd->streamer != file)
        return POLLERR;

    mutex_lock(&icd->video_lock);
    if (ici->ops->init_videobuf && list_empty(&icd->vb_vidq.stream))
        dev_err(icd->pdev, "Trying to poll with no queued buffers!\n");
    else
        res = ici->ops->poll(file, pt);
    mutex_unlock(&icd->video_lock);
    return res;
}

void soc_camera_lock(struct vb2_queue *vq)
{
    struct soc_camera_device *icd = vb2_get_drv_priv(vq);
    mutex_lock(&icd->video_lock);
}
EXPORT_SYMBOL(soc_camera_lock);

void soc_camera_unlock(struct vb2_queue *vq)
{
    struct soc_camera_device *icd = vb2_get_drv_priv(vq);
    mutex_unlock(&icd->video_lock);
}
EXPORT_SYMBOL(soc_camera_unlock);

static struct v4l2_file_operations soc_camera_fops = {
    .owner      = THIS_MODULE,
    .open       = soc_camera_open,
    .release    = soc_camera_close,
    .unlocked_ioctl = video_ioctl2,
    .read       = soc_camera_read,
    .mmap       = soc_camera_mmap,
    .poll       = soc_camera_poll,
};

static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
                    struct v4l2_format *f)
{
    struct soc_camera_device *icd = file->private_data;
    int ret;

    WARN_ON(priv != file->private_data);

    if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
        dev_warn(icd->pdev, "Wrong buf-type %d\n", f->type);
        return -EINVAL;
    }

    if (icd->streamer && icd->streamer != file)
        return -EBUSY;

    if (is_streaming(to_soc_camera_host(icd->parent), icd)) {
        dev_err(icd->pdev, "S_FMT denied: queue initialised\n");
        return -EBUSY;
    }

    ret = soc_camera_set_fmt(icd, f);

    if (!ret && !icd->streamer)
        icd->streamer = file;

    return ret;
}

static int soc_camera_enum_fmt_vid_cap(struct file *file, void  *priv,
                       struct v4l2_fmtdesc *f)
{
    struct soc_camera_device *icd = file->private_data;
    const struct soc_mbus_pixelfmt *format;

    WARN_ON(priv != file->private_data);

    if (f->index >= icd->num_user_formats)
        return -EINVAL;

    format = icd->user_formats[f->index].host_fmt;

    if (format->name)
        strlcpy(f->description, format->name, sizeof(f->description));
    f->pixelformat = format->fourcc;
    return 0;
}

static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
                    struct v4l2_format *f)
{
    struct soc_camera_device *icd = file->private_data;
    struct v4l2_pix_format *pix = &f->fmt.pix;

    WARN_ON(priv != file->private_data);

    if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
        return -EINVAL;

    pix->width      = icd->user_width;
    pix->height     = icd->user_height;
    pix->bytesperline   = icd->bytesperline;
    pix->sizeimage      = icd->sizeimage;
    pix->field      = icd->field;
    pix->pixelformat    = icd->current_fmt->host_fmt->fourcc;
    pix->colorspace     = icd->colorspace;
    dev_dbg(icd->pdev, "current_fmt->fourcc: 0x%08x\n",
        icd->current_fmt->host_fmt->fourcc);
    return 0;
}

static int soc_camera_querycap(struct file *file, void  *priv,
                   struct v4l2_capability *cap)
{
    struct soc_camera_device *icd = file->private_data;
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);

    WARN_ON(priv != file->private_data);

    strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
    return ici->ops->querycap(ici, cap);
}

static int soc_camera_streamon(struct file *file, void *priv,
                   enum v4l2_buf_type i)
{
    struct soc_camera_device *icd = file->private_data;
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
    struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
    int ret;

    WARN_ON(priv != file->private_data);

    if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
        return -EINVAL;

    if (icd->streamer != file)
        return -EBUSY;

    /* This calls buf_queue from host driver's videobuf_queue_ops */
    if (ici->ops->init_videobuf)
        ret = videobuf_streamon(&icd->vb_vidq);
    else
        ret = vb2_streamon(&icd->vb2_vidq, i);

    if (!ret)
        v4l2_subdev_call(sd, video, s_stream, 1);

    return ret;
}

static int soc_camera_streamoff(struct file *file, void *priv,
                enum v4l2_buf_type i)
{
    struct soc_camera_device *icd = file->private_data;
    struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);

    WARN_ON(priv != file->private_data);

    if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
        return -EINVAL;

    if (icd->streamer != file)
        return -EBUSY;

    /*
     * This calls buf_release from host driver's videobuf_queue_ops for all
     * remaining buffers. When the last buffer is freed, stop capture
     */
    if (ici->ops->init_videobuf)
        videobuf_streamoff(&icd->vb_vidq);
    else
        vb2_streamoff(&icd->vb2_vidq, i);

    v4l2_subdev_call(sd, video, s_stream, 0);

    return 0;
}

static int soc_camera_cropcap(struct file *file, void *fh,
                  struct v4l2_cropcap *a)
{
    struct soc_camera_device *icd = file->private_data;
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);

    return ici->ops->cropcap(icd, a);
}

static int soc_camera_g_crop(struct file *file, void *fh,
                 struct v4l2_crop *a)
{
    struct soc_camera_device *icd = file->private_data;
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
    int ret;

    ret = ici->ops->get_crop(icd, a);

    return ret;
}

/*
 * According to the V4L2 API, drivers shall not update the struct v4l2_crop
 * argument with the actual geometry, instead, the user shall use G_CROP to
 * retrieve it.
 */
static int soc_camera_s_crop(struct file *file, void *fh,
                 const struct v4l2_crop *a)
{
    struct soc_camera_device *icd = file->private_data;
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
    const struct v4l2_rect *rect = &a->c;
    struct v4l2_crop current_crop;
    int ret;

    if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
        return -EINVAL;

    dev_dbg(icd->pdev, "S_CROP(%ux%u@%u:%u)\n",
        rect->width, rect->height, rect->left, rect->top);

    /* If get_crop fails, we'll let host and / or client drivers decide */
    ret = ici->ops->get_crop(icd, &current_crop);

    /* Prohibit window size change with initialised buffers */
    if (ret < 0) {
        dev_err(icd->pdev,
            "S_CROP denied: getting current crop failed\n");
    } else if ((a->c.width == current_crop.c.width &&
            a->c.height == current_crop.c.height) ||
           !is_streaming(ici, icd)) {
        /* same size or not streaming - use .set_crop() */
        ret = ici->ops->set_crop(icd, a);
    } else if (ici->ops->set_livecrop) {
        ret = ici->ops->set_livecrop(icd, a);
    } else {
        dev_err(icd->pdev,
            "S_CROP denied: queue initialised and sizes differ\n");
        ret = -EBUSY;
    }

    return ret;
}

static int soc_camera_g_selection(struct file *file, void *fh,
                  struct v4l2_selection *s)
{
    struct soc_camera_device *icd = file->private_data;
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);

    /* With a wrong type no need to try to fall back to cropping */
    if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
        return -EINVAL;

    if (!ici->ops->get_selection)
        return -ENOTTY;

    return ici->ops->get_selection(icd, s);
}

static int soc_camera_s_selection(struct file *file, void *fh,
                  struct v4l2_selection *s)
{
    struct soc_camera_device *icd = file->private_data;
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
    int ret;

    /* In all these cases cropping emulation will not help */
    if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
        (s->target != V4L2_SEL_TGT_COMPOSE &&
         s->target != V4L2_SEL_TGT_CROP))
        return -EINVAL;

    if (s->target == V4L2_SEL_TGT_COMPOSE) {
        /* No output size change during a running capture! */
        if (is_streaming(ici, icd) &&
            (icd->user_width != s->r.width ||
             icd->user_height != s->r.height))
            return -EBUSY;

        /*
         * Only one user is allowed to change the output format, touch
         * buffers, start / stop streaming, poll for data
         */
        if (icd->streamer && icd->streamer != file)
            return -EBUSY;
    }

    if (!ici->ops->set_selection)
        return -ENOTTY;

    ret = ici->ops->set_selection(icd, s);
    if (!ret &&
        s->target == V4L2_SEL_TGT_COMPOSE) {
        icd->user_width = s->r.width;
        icd->user_height = s->r.height;
        if (!icd->streamer)
            icd->streamer = file;
    }

    return ret;
}

static int soc_camera_g_parm(struct file *file, void *fh,
                 struct v4l2_streamparm *a)
{
    struct soc_camera_device *icd = file->private_data;
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);

    if (ici->ops->get_parm)
        return ici->ops->get_parm(icd, a);

    return -ENOIOCTLCMD;
}

static int soc_camera_s_parm(struct file *file, void *fh,
                 struct v4l2_streamparm *a)
{
    struct soc_camera_device *icd = file->private_data;
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);

    if (ici->ops->set_parm)
        return ici->ops->set_parm(icd, a);

    return -ENOIOCTLCMD;
}

static int soc_camera_g_chip_ident(struct file *file, void *fh,
                   struct v4l2_dbg_chip_ident *id)
{
    struct soc_camera_device *icd = file->private_data;
    struct v4l2_subdev *sd = soc_camera_to_subdev(icd);

    return v4l2_subdev_call(sd, core, g_chip_ident, id);
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int soc_camera_g_register(struct file *file, void *fh,
                 struct v4l2_dbg_register *reg)
{
    struct soc_camera_device *icd = file->private_data;
    struct v4l2_subdev *sd = soc_camera_to_subdev(icd);

    return v4l2_subdev_call(sd, core, g_register, reg);
}

static int soc_camera_s_register(struct file *file, void *fh,
                 struct v4l2_dbg_register *reg)
{
    struct soc_camera_device *icd = file->private_data;
    struct v4l2_subdev *sd = soc_camera_to_subdev(icd);

    return v4l2_subdev_call(sd, core, s_register, reg);
}
#endif

static int soc_camera_probe(struct soc_camera_device *icd);

/* So far this function cannot fail */
static void scan_add_host(struct soc_camera_host *ici)
{
    struct soc_camera_device *icd;

    mutex_lock(&ici->host_lock);

    list_for_each_entry(icd, &devices, list) {
        if (icd->iface == ici->nr) {
            int ret;

            icd->parent = ici->v4l2_dev.dev;
            ret = soc_camera_probe(icd);
        }
    }

    mutex_unlock(&ici->host_lock);
}

#ifdef CONFIG_I2C_BOARDINFO
static int soc_camera_init_i2c(struct soc_camera_device *icd,
                   struct soc_camera_link *icl)
{
    struct i2c_client *client;
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
    struct i2c_adapter *adap = i2c_get_adapter(icl->i2c_adapter_id);
    struct v4l2_subdev *subdev;

    if (!adap) {
        dev_err(icd->pdev, "Cannot get I2C adapter #%d. No driver?\n",
            icl->i2c_adapter_id);
        goto ei2cga;
    }

    icl->board_info->platform_data = icl;

    subdev = v4l2_i2c_new_subdev_board(&ici->v4l2_dev, adap,
                icl->board_info, NULL);
    if (!subdev)
        goto ei2cnd;

    client = v4l2_get_subdevdata(subdev);

    /* Use to_i2c_client(dev) to recover the i2c client */
    icd->control = &client->dev;

    return 0;
ei2cnd:
    i2c_put_adapter(adap);
ei2cga:
    return -ENODEV;
}

static void soc_camera_free_i2c(struct soc_camera_device *icd)
{
    struct i2c_client *client =
        to_i2c_client(to_soc_camera_control(icd));
    struct i2c_adapter *adap = client->adapter;

    icd->control = NULL;
    v4l2_device_unregister_subdev(i2c_get_clientdata(client));
    i2c_unregister_device(client);
    i2c_put_adapter(adap);
}
#else
#define soc_camera_init_i2c(icd, icl)   (-ENODEV)
#define soc_camera_free_i2c(icd)    do {} while (0)
#endif

static int soc_camera_video_start(struct soc_camera_device *icd);
static int video_dev_create(struct soc_camera_device *icd);
/* Called during host-driver probe */
static int soc_camera_probe(struct soc_camera_device *icd)
{
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
    struct soc_camera_link *icl = to_soc_camera_link(icd);
    struct device *control = NULL;
    struct v4l2_subdev *sd;
    struct v4l2_mbus_framefmt mf;
    int ret;

    dev_info(icd->pdev, "Probing %s\n", dev_name(icd->pdev));

    /*
     * Currently the subdev with the largest number of controls (13) is
     * ov6550. So let's pick 16 as a hint for the control handler. Note
     * that this is a hint only: too large and you waste some memory, too
     * small and there is a (very) small performance hit when looking up
     * controls in the internal hash.
     */
    ret = v4l2_ctrl_handler_init(&icd->ctrl_handler, 16);
    if (ret < 0)
        return ret;

    ret = regulator_bulk_get(icd->pdev, icl->num_regulators,
                 icl->regulators);
    if (ret < 0)
        goto ereg;

    /* The camera could have been already on, try to reset */
    if (icl->reset)
        icl->reset(icd->pdev);

    ret = ici->ops->add(icd);
    if (ret < 0)
        goto eadd;

    /* Must have icd->vdev before registering the device */
    ret = video_dev_create(icd);
    if (ret < 0)
        goto evdc;

    /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
    if (icl->board_info) {
        ret = soc_camera_init_i2c(icd, icl);
        if (ret < 0)
            goto eadddev;
    } else if (!icl->add_device || !icl->del_device) {
        ret = -EINVAL;
        goto eadddev;
    } else {
        if (icl->module_name)
            ret = request_module(icl->module_name);

        ret = icl->add_device(icd);
        if (ret < 0)
            goto eadddev;

        /*
         * FIXME: this is racy, have to use driver-binding notification,
         * when it is available
         */
        control = to_soc_camera_control(icd);
        if (!control || !control->driver || !dev_get_drvdata(control) ||
            !try_module_get(control->driver->owner)) {
            icl->del_device(icd);
            ret = -ENODEV;
            goto enodrv;
        }
    }

    sd = soc_camera_to_subdev(icd);
    sd->grp_id = soc_camera_grp_id(icd);
    v4l2_set_subdev_hostdata(sd, icd);

    ret = v4l2_ctrl_add_handler(&icd->ctrl_handler, sd->ctrl_handler, NULL);
    if (ret < 0)
        goto ectrl;

    /* At this point client .probe() should have run already */
    ret = soc_camera_init_user_formats(icd);
    if (ret < 0)
        goto eiufmt;

    icd->field = V4L2_FIELD_ANY;

    /*
     * ..._video_start() will create a device node, video_register_device()
     * itself is protected against concurrent open() calls, but we also have
     * to protect our data.
     */
    mutex_lock(&icd->video_lock);

    ret = soc_camera_video_start(icd);
    if (ret < 0)
        goto evidstart;

    /* Try to improve our guess of a reasonable window format */
    if (!v4l2_subdev_call(sd, video, g_mbus_fmt, &mf)) {
        icd->user_width     = mf.width;
        icd->user_height    = mf.height;
        icd->colorspace     = mf.colorspace;
        icd->field      = mf.field;
    }

    ici->ops->remove(icd);

    mutex_unlock(&icd->video_lock);

    return 0;

evidstart:
    mutex_unlock(&icd->video_lock);
    soc_camera_free_user_formats(icd);
eiufmt:
ectrl:
    if (icl->board_info) {
        soc_camera_free_i2c(icd);
    } else {
        icl->del_device(icd);
        module_put(control->driver->owner);
    }
enodrv:
eadddev:
    video_device_release(icd->vdev);
    icd->vdev = NULL;
evdc:
    ici->ops->remove(icd);
eadd:
    regulator_bulk_free(icl->num_regulators, icl->regulators);
ereg:
    v4l2_ctrl_handler_free(&icd->ctrl_handler);
    return ret;
}

/*
 * This is called on device_unregister, which only means we have to disconnect
 * from the host, but not remove ourselves from the device list
 */
static int soc_camera_remove(struct soc_camera_device *icd)
{
    struct soc_camera_link *icl = to_soc_camera_link(icd);
    struct video_device *vdev = icd->vdev;

    BUG_ON(!icd->parent);

    v4l2_ctrl_handler_free(&icd->ctrl_handler);
    if (vdev) {
        video_unregister_device(vdev);
        icd->vdev = NULL;
    }

    if (icl->board_info) {
        soc_camera_free_i2c(icd);
    } else {
        struct device_driver *drv = to_soc_camera_control(icd)->driver;
        if (drv) {
            icl->del_device(icd);
            module_put(drv->owner);
        }
    }
    soc_camera_free_user_formats(icd);

    regulator_bulk_free(icl->num_regulators, icl->regulators);

    return 0;
}

static int default_cropcap(struct soc_camera_device *icd,
               struct v4l2_cropcap *a)
{
    struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
    return v4l2_subdev_call(sd, video, cropcap, a);
}

static int default_g_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
{
    struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
    return v4l2_subdev_call(sd, video, g_crop, a);
}

static int default_s_crop(struct soc_camera_device *icd, const struct v4l2_crop *a)
{
    struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
    return v4l2_subdev_call(sd, video, s_crop, a);
}

static int default_g_parm(struct soc_camera_device *icd,
              struct v4l2_streamparm *parm)
{
    struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
    return v4l2_subdev_call(sd, video, g_parm, parm);
}

static int default_s_parm(struct soc_camera_device *icd,
              struct v4l2_streamparm *parm)
{
    struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
    return v4l2_subdev_call(sd, video, s_parm, parm);
}

static int default_enum_framesizes(struct soc_camera_device *icd,
                   struct v4l2_frmsizeenum *fsize)
{
    int ret;
    struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
    const struct soc_camera_format_xlate *xlate;
    __u32 pixfmt = fsize->pixel_format;
    struct v4l2_frmsizeenum fsize_mbus = *fsize;

    xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
    if (!xlate)
        return -EINVAL;
    /* map xlate-code to pixel_format, sensor only handle xlate-code*/
    fsize_mbus.pixel_format = xlate->code;

    ret = v4l2_subdev_call(sd, video, enum_framesizes, &fsize_mbus);
    if (ret < 0)
        return ret;

    *fsize = fsize_mbus;
    fsize->pixel_format = pixfmt;

    return 0;
}

int soc_camera_host_register(struct soc_camera_host *ici)
{
    struct soc_camera_host *ix;
    int ret;

    if (!ici || !ici->ops ||
        !ici->ops->try_fmt ||
        !ici->ops->set_fmt ||
        !ici->ops->set_bus_param ||
        !ici->ops->querycap ||
        ((!ici->ops->init_videobuf ||
          !ici->ops->reqbufs) &&
         !ici->ops->init_videobuf2) ||
        !ici->ops->add ||
        !ici->ops->remove ||
        !ici->ops->poll ||
        !ici->v4l2_dev.dev)
        return -EINVAL;

    if (!ici->ops->set_crop)
        ici->ops->set_crop = default_s_crop;
    if (!ici->ops->get_crop)
        ici->ops->get_crop = default_g_crop;
    if (!ici->ops->cropcap)
        ici->ops->cropcap = default_cropcap;
    if (!ici->ops->set_parm)
        ici->ops->set_parm = default_s_parm;
    if (!ici->ops->get_parm)
        ici->ops->get_parm = default_g_parm;
    if (!ici->ops->enum_framesizes)
        ici->ops->enum_framesizes = default_enum_framesizes;

    mutex_lock(&list_lock);
    list_for_each_entry(ix, &hosts, list) {
        if (ix->nr == ici->nr) {
            ret = -EBUSY;
            goto edevreg;
        }
    }

    ret = v4l2_device_register(ici->v4l2_dev.dev, &ici->v4l2_dev);
    if (ret < 0)
        goto edevreg;

    list_add_tail(&ici->list, &hosts);
    mutex_unlock(&list_lock);

    mutex_init(&ici->host_lock);
    scan_add_host(ici);

    return 0;

edevreg:
    mutex_unlock(&list_lock);
    return ret;
}
EXPORT_SYMBOL(soc_camera_host_register);

/* Unregister all clients! */
void soc_camera_host_unregister(struct soc_camera_host *ici)
{
    struct soc_camera_device *icd;

    mutex_lock(&list_lock);

    list_del(&ici->list);
    list_for_each_entry(icd, &devices, list)
        if (icd->iface == ici->nr && to_soc_camera_control(icd))
            soc_camera_remove(icd);

    mutex_unlock(&list_lock);

    v4l2_device_unregister(&ici->v4l2_dev);
}
EXPORT_SYMBOL(soc_camera_host_unregister);

/* Image capture device */
static int soc_camera_device_register(struct soc_camera_device *icd)
{
    struct soc_camera_device *ix;
    int num = -1, i;

    for (i = 0; i < 256 && num < 0; i++) {
        num = i;
        /* Check if this index is available on this interface */
        list_for_each_entry(ix, &devices, list) {
            if (ix->iface == icd->iface && ix->devnum == i) {
                num = -1;
                break;
            }
        }
    }

    if (num < 0)
        /*
         * ok, we have 256 cameras on this host...
         * man, stay reasonable...
         */
        return -ENOMEM;

    icd->devnum     = num;
    icd->use_count      = 0;
    icd->host_priv      = NULL;
    mutex_init(&icd->video_lock);

    list_add_tail(&icd->list, &devices);

    return 0;
}

static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
    .vidioc_querycap     = soc_camera_querycap,
    .vidioc_try_fmt_vid_cap  = soc_camera_try_fmt_vid_cap,
    .vidioc_g_fmt_vid_cap    = soc_camera_g_fmt_vid_cap,
    .vidioc_s_fmt_vid_cap    = soc_camera_s_fmt_vid_cap,
    .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
    .vidioc_enum_input   = soc_camera_enum_input,
    .vidioc_g_input      = soc_camera_g_input,
    .vidioc_s_input      = soc_camera_s_input,
    .vidioc_s_std        = soc_camera_s_std,
    .vidioc_g_std        = soc_camera_g_std,
    .vidioc_enum_framesizes  = soc_camera_enum_framesizes,
    .vidioc_reqbufs      = soc_camera_reqbufs,
    .vidioc_querybuf     = soc_camera_querybuf,
    .vidioc_qbuf         = soc_camera_qbuf,
    .vidioc_dqbuf        = soc_camera_dqbuf,
    .vidioc_create_bufs  = soc_camera_create_bufs,
    .vidioc_prepare_buf  = soc_camera_prepare_buf,
    .vidioc_streamon     = soc_camera_streamon,
    .vidioc_streamoff    = soc_camera_streamoff,
    .vidioc_cropcap      = soc_camera_cropcap,
    .vidioc_g_crop       = soc_camera_g_crop,
    .vidioc_s_crop       = soc_camera_s_crop,
    .vidioc_g_selection  = soc_camera_g_selection,
    .vidioc_s_selection  = soc_camera_s_selection,
    .vidioc_g_parm       = soc_camera_g_parm,
    .vidioc_s_parm       = soc_camera_s_parm,
    .vidioc_g_chip_ident     = soc_camera_g_chip_ident,
#ifdef CONFIG_VIDEO_ADV_DEBUG
    .vidioc_g_register   = soc_camera_g_register,
    .vidioc_s_register   = soc_camera_s_register,
#endif
};

static int video_dev_create(struct soc_camera_device *icd)
{
    struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
    struct video_device *vdev = video_device_alloc();

    if (!vdev)
        return -ENOMEM;

    strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));

    vdev->parent        = icd->pdev;
    vdev->current_norm  = V4L2_STD_UNKNOWN;
    vdev->fops      = &soc_camera_fops;
    vdev->ioctl_ops     = &soc_camera_ioctl_ops;
    vdev->release       = video_device_release;
    vdev->tvnorms       = V4L2_STD_UNKNOWN;
    vdev->ctrl_handler  = &icd->ctrl_handler;
    vdev->lock      = &icd->video_lock;

    icd->vdev = vdev;

    return 0;
}

/*
 * Called from soc_camera_probe() above (with .video_lock held???)
 */
static int soc_camera_video_start(struct soc_camera_device *icd)
{
    const struct device_type *type = icd->vdev->dev.type;
    int ret;

    if (!icd->parent)
        return -ENODEV;

    ret = video_register_device(icd->vdev, VFL_TYPE_GRABBER, -1);
    if (ret < 0) {
        dev_err(icd->pdev, "video_register_device failed: %d\n", ret);
        return ret;
    }

    /* Restore device type, possibly set by the subdevice driver */
    icd->vdev->dev.type = type;

    return 0;
}

static int __devinit soc_camera_pdrv_probe(struct platform_device *pdev)
{
    struct soc_camera_link *icl = pdev->dev.platform_data;
    struct soc_camera_device *icd;

    if (!icl)
        return -EINVAL;

    icd = devm_kzalloc(&pdev->dev, sizeof(*icd), GFP_KERNEL);
    if (!icd)
        return -ENOMEM;

    icd->iface = icl->bus_id;
    icd->link = icl;
    icd->pdev = &pdev->dev;
    platform_set_drvdata(pdev, icd);

    icd->user_width     = DEFAULT_WIDTH;
    icd->user_height    = DEFAULT_HEIGHT;

    return soc_camera_device_register(icd);
}

/*
 * Only called on rmmod for each platform device, since they are not
 * hot-pluggable. Now we know, that all our users - hosts and devices have
 * been unloaded already
 */
static int __devexit soc_camera_pdrv_remove(struct platform_device *pdev)
{
    struct soc_camera_device *icd = platform_get_drvdata(pdev);

    if (!icd)
        return -EINVAL;

    list_del(&icd->list);

    return 0;
}

static struct platform_driver __refdata soc_camera_pdrv = {
    .probe = soc_camera_pdrv_probe,
    .remove  = __devexit_p(soc_camera_pdrv_remove),
    .driver  = {
        .name   = "soc-camera-pdrv",
        .owner  = THIS_MODULE,
    },
};

module_platform_driver(soc_camera_pdrv);

MODULE_DESCRIPTION("Image capture bus driver");
MODULE_AUTHOR("Guennadi Liakhovetski <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:soc-camera-pdrv");