timblogiw.c

Go to the documentation of this file.

/*
 * timblogiw.c timberdale FPGA LogiWin Video In driver
 * Copyright (c) 2009-2010 Intel Corporation
 *
 * 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.
 *
 * This program 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 General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* Supports:
 * Timberdale FPGA LogiWin Video In
 */

#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/dmaengine.h>
#include <linux/scatterlist.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-device.h>
#include <media/videobuf-dma-contig.h>
#include <media/timb_video.h>

#define DRIVER_NAME         "timb-video"

#define TIMBLOGIWIN_NAME        "Timberdale Video-In"
#define TIMBLOGIW_VERSION_CODE      0x04

#define TIMBLOGIW_LINES_PER_DESC    44
#define TIMBLOGIW_MAX_VIDEO_MEM     16

#define TIMBLOGIW_HAS_DECODER(lw)   (lw->pdata.encoder.module_name)


struct timblogiw {
    struct video_device     video_dev;
    struct v4l2_device      v4l2_dev; /* mutual exclusion */
    struct mutex            lock;
    struct device           *dev;
    struct timb_video_platform_data pdata;
    struct v4l2_subdev      *sd_enc;    /* encoder */
    bool                opened;
};

struct timblogiw_tvnorm {
    v4l2_std_id std;
    u16     width;
    u16     height;
    u8  fps;
};

struct timblogiw_fh {
    struct videobuf_queue       vb_vidq;
    struct timblogiw_tvnorm const   *cur_norm;
    struct list_head        capture;
    struct dma_chan         *chan;
    spinlock_t          queue_lock; /* mutual exclusion */
    unsigned int            frame_count;
};

struct timblogiw_buffer {
    /* common v4l buffer stuff -- must be first */
    struct videobuf_buffer  vb;
    struct scatterlist  sg[16];
    dma_cookie_t        cookie;
    struct timblogiw_fh *fh;
};

const struct timblogiw_tvnorm timblogiw_tvnorms[] = {
    {
        .std            = V4L2_STD_PAL,
        .width          = 720,
        .height         = 576,
        .fps            = 25
    },
    {
        .std            = V4L2_STD_NTSC,
        .width          = 720,
        .height         = 480,
        .fps            = 30
    }
};

static int timblogiw_bytes_per_line(const struct timblogiw_tvnorm *norm)
{
    return norm->width * 2;
}


static int timblogiw_frame_size(const struct timblogiw_tvnorm *norm)
{
    return norm->height * timblogiw_bytes_per_line(norm);
}

static const struct timblogiw_tvnorm *timblogiw_get_norm(const v4l2_std_id std)
{
    int i;
    for (i = 0; i < ARRAY_SIZE(timblogiw_tvnorms); i++)
        if (timblogiw_tvnorms[i].std & std)
            return timblogiw_tvnorms + i;

    /* default to first element */
    return timblogiw_tvnorms;
}

static void timblogiw_dma_cb(void *data)
{
    struct timblogiw_buffer *buf = data;
    struct timblogiw_fh *fh = buf->fh;
    struct videobuf_buffer *vb = &buf->vb;

    spin_lock(&fh->queue_lock);

    /* mark the transfer done */
    buf->cookie = -1;

    fh->frame_count++;

    if (vb->state != VIDEOBUF_ERROR) {
        list_del(&vb->queue);
        do_gettimeofday(&vb->ts);
        vb->field_count = fh->frame_count * 2;
        vb->state = VIDEOBUF_DONE;

        wake_up(&vb->done);
    }

    if (!list_empty(&fh->capture)) {
        vb = list_entry(fh->capture.next, struct videobuf_buffer,
            queue);
        vb->state = VIDEOBUF_ACTIVE;
    }

    spin_unlock(&fh->queue_lock);
}

static bool timblogiw_dma_filter_fn(struct dma_chan *chan, void *filter_param)
{
    return chan->chan_id == (uintptr_t)filter_param;
}

/* IOCTL functions */

static int timblogiw_g_fmt(struct file *file, void  *priv,
    struct v4l2_format *format)
{
    struct video_device *vdev = video_devdata(file);
    struct timblogiw *lw = video_get_drvdata(vdev);
    struct timblogiw_fh *fh = priv;

    dev_dbg(&vdev->dev, "%s entry\n", __func__);

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

    mutex_lock(&lw->lock);

    format->fmt.pix.width = fh->cur_norm->width;
    format->fmt.pix.height = fh->cur_norm->height;
    format->fmt.pix.pixelformat = V4L2_PIX_FMT_UYVY;
    format->fmt.pix.bytesperline = timblogiw_bytes_per_line(fh->cur_norm);
    format->fmt.pix.sizeimage = timblogiw_frame_size(fh->cur_norm);
    format->fmt.pix.field = V4L2_FIELD_NONE;

    mutex_unlock(&lw->lock);

    return 0;
}

static int timblogiw_try_fmt(struct file *file, void  *priv,
    struct v4l2_format *format)
{
    struct video_device *vdev = video_devdata(file);
    struct v4l2_pix_format *pix = &format->fmt.pix;

    dev_dbg(&vdev->dev,
        "%s - width=%d, height=%d, pixelformat=%d, field=%d\n"
        "bytes per line %d, size image: %d, colorspace: %d\n",
        __func__,
        pix->width, pix->height, pix->pixelformat, pix->field,
        pix->bytesperline, pix->sizeimage, pix->colorspace);

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

    if (pix->field != V4L2_FIELD_NONE)
        return -EINVAL;

    if (pix->pixelformat != V4L2_PIX_FMT_UYVY)
        return -EINVAL;

    return 0;
}

static int timblogiw_s_fmt(struct file *file, void  *priv,
    struct v4l2_format *format)
{
    struct video_device *vdev = video_devdata(file);
    struct timblogiw *lw = video_get_drvdata(vdev);
    struct timblogiw_fh *fh = priv;
    struct v4l2_pix_format *pix = &format->fmt.pix;
    int err;

    mutex_lock(&lw->lock);

    err = timblogiw_try_fmt(file, priv, format);
    if (err)
        goto out;

    if (videobuf_queue_is_busy(&fh->vb_vidq)) {
        dev_err(&vdev->dev, "%s queue busy\n", __func__);
        err = -EBUSY;
        goto out;
    }

    pix->width = fh->cur_norm->width;
    pix->height = fh->cur_norm->height;

out:
    mutex_unlock(&lw->lock);
    return err;
}

static int timblogiw_querycap(struct file *file, void  *priv,
    struct v4l2_capability *cap)
{
    struct video_device *vdev = video_devdata(file);

    dev_dbg(&vdev->dev, "%s: Entry\n",  __func__);
    memset(cap, 0, sizeof(*cap));
    strncpy(cap->card, TIMBLOGIWIN_NAME, sizeof(cap->card)-1);
    strncpy(cap->driver, DRIVER_NAME, sizeof(cap->driver) - 1);
    strlcpy(cap->bus_info, vdev->name, sizeof(cap->bus_info));
    cap->version = TIMBLOGIW_VERSION_CODE;
    cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
        V4L2_CAP_READWRITE;

    return 0;
}

static int timblogiw_enum_fmt(struct file *file, void  *priv,
    struct v4l2_fmtdesc *fmt)
{
    struct video_device *vdev = video_devdata(file);

    dev_dbg(&vdev->dev, "%s, index: %d\n",  __func__, fmt->index);

    if (fmt->index != 0)
        return -EINVAL;
    memset(fmt, 0, sizeof(*fmt));
    fmt->index = 0;
    fmt->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    strncpy(fmt->description, "4:2:2, packed, YUYV",
        sizeof(fmt->description)-1);
    fmt->pixelformat = V4L2_PIX_FMT_UYVY;

    return 0;
}

static int timblogiw_g_parm(struct file *file, void *priv,
    struct v4l2_streamparm *sp)
{
    struct timblogiw_fh *fh = priv;
    struct v4l2_captureparm *cp = &sp->parm.capture;

    cp->capability = V4L2_CAP_TIMEPERFRAME;
    cp->timeperframe.numerator = 1;
    cp->timeperframe.denominator = fh->cur_norm->fps;

    return 0;
}

static int timblogiw_reqbufs(struct file *file, void  *priv,
    struct v4l2_requestbuffers *rb)
{
    struct video_device *vdev = video_devdata(file);
    struct timblogiw_fh *fh = priv;

    dev_dbg(&vdev->dev, "%s: entry\n",  __func__);

    return videobuf_reqbufs(&fh->vb_vidq, rb);
}

static int timblogiw_querybuf(struct file *file, void  *priv,
    struct v4l2_buffer *b)
{
    struct video_device *vdev = video_devdata(file);
    struct timblogiw_fh *fh = priv;

    dev_dbg(&vdev->dev, "%s: entry\n",  __func__);

    return videobuf_querybuf(&fh->vb_vidq, b);
}

static int timblogiw_qbuf(struct file *file, void  *priv, struct v4l2_buffer *b)
{
    struct video_device *vdev = video_devdata(file);
    struct timblogiw_fh *fh = priv;

    dev_dbg(&vdev->dev, "%s: entry\n",  __func__);

    return videobuf_qbuf(&fh->vb_vidq, b);
}

static int timblogiw_dqbuf(struct file *file, void  *priv,
    struct v4l2_buffer *b)
{
    struct video_device *vdev = video_devdata(file);
    struct timblogiw_fh *fh = priv;

    dev_dbg(&vdev->dev, "%s: entry\n",  __func__);

    return videobuf_dqbuf(&fh->vb_vidq, b, file->f_flags & O_NONBLOCK);
}

static int timblogiw_g_std(struct file *file, void  *priv, v4l2_std_id *std)
{
    struct video_device *vdev = video_devdata(file);
    struct timblogiw_fh *fh = priv;

    dev_dbg(&vdev->dev, "%s: entry\n",  __func__);

    *std = fh->cur_norm->std;
    return 0;
}

static int timblogiw_s_std(struct file *file, void  *priv, v4l2_std_id *std)
{
    struct video_device *vdev = video_devdata(file);
    struct timblogiw *lw = video_get_drvdata(vdev);
    struct timblogiw_fh *fh = priv;
    int err = 0;

    dev_dbg(&vdev->dev, "%s: entry\n",  __func__);

    mutex_lock(&lw->lock);

    if (TIMBLOGIW_HAS_DECODER(lw))
        err = v4l2_subdev_call(lw->sd_enc, core, s_std, *std);

    if (!err)
        fh->cur_norm = timblogiw_get_norm(*std);

    mutex_unlock(&lw->lock);

    return err;
}

static int timblogiw_enuminput(struct file *file, void  *priv,
    struct v4l2_input *inp)
{
    struct video_device *vdev = video_devdata(file);
    int i;

    dev_dbg(&vdev->dev, "%s: Entry\n",  __func__);

    if (inp->index != 0)
        return -EINVAL;

    inp->index = 0;

    strncpy(inp->name, "Timb input 1", sizeof(inp->name) - 1);
    inp->type = V4L2_INPUT_TYPE_CAMERA;

    inp->std = 0;
    for (i = 0; i < ARRAY_SIZE(timblogiw_tvnorms); i++)
        inp->std |= timblogiw_tvnorms[i].std;

    return 0;
}

static int timblogiw_g_input(struct file *file, void  *priv,
    unsigned int *input)
{
    struct video_device *vdev = video_devdata(file);

    dev_dbg(&vdev->dev, "%s: Entry\n",  __func__);

    *input = 0;

    return 0;
}

static int timblogiw_s_input(struct file *file, void  *priv, unsigned int input)
{
    struct video_device *vdev = video_devdata(file);

    dev_dbg(&vdev->dev, "%s: Entry\n",  __func__);

    if (input != 0)
        return -EINVAL;
    return 0;
}

static int timblogiw_streamon(struct file *file, void  *priv, unsigned int type)
{
    struct video_device *vdev = video_devdata(file);
    struct timblogiw_fh *fh = priv;

    dev_dbg(&vdev->dev, "%s: entry\n",  __func__);

    if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
        dev_dbg(&vdev->dev, "%s - No capture device\n", __func__);
        return -EINVAL;
    }

    fh->frame_count = 0;
    return videobuf_streamon(&fh->vb_vidq);
}

static int timblogiw_streamoff(struct file *file, void  *priv,
    unsigned int type)
{
    struct video_device *vdev = video_devdata(file);
    struct timblogiw_fh *fh = priv;

    dev_dbg(&vdev->dev, "%s entry\n",  __func__);

    if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
        return -EINVAL;

    return videobuf_streamoff(&fh->vb_vidq);
}

static int timblogiw_querystd(struct file *file, void  *priv, v4l2_std_id *std)
{
    struct video_device *vdev = video_devdata(file);
    struct timblogiw *lw = video_get_drvdata(vdev);
    struct timblogiw_fh *fh = priv;

    dev_dbg(&vdev->dev, "%s entry\n",  __func__);

    if (TIMBLOGIW_HAS_DECODER(lw))
        return v4l2_subdev_call(lw->sd_enc, video, querystd, std);
    else {
        *std = fh->cur_norm->std;
        return 0;
    }
}

static int timblogiw_enum_framesizes(struct file *file, void  *priv,
    struct v4l2_frmsizeenum *fsize)
{
    struct video_device *vdev = video_devdata(file);
    struct timblogiw_fh *fh = priv;

    dev_dbg(&vdev->dev, "%s - index: %d, format: %d\n",  __func__,
        fsize->index, fsize->pixel_format);

    if ((fsize->index != 0) ||
        (fsize->pixel_format != V4L2_PIX_FMT_UYVY))
        return -EINVAL;

    fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
    fsize->discrete.width = fh->cur_norm->width;
    fsize->discrete.height = fh->cur_norm->height;

    return 0;
}

/* Video buffer functions */

static int buffer_setup(struct videobuf_queue *vq, unsigned int *count,
    unsigned int *size)
{
    struct timblogiw_fh *fh = vq->priv_data;

    *size = timblogiw_frame_size(fh->cur_norm);

    if (!*count)
        *count = 32;

    while (*size * *count > TIMBLOGIW_MAX_VIDEO_MEM * 1024 * 1024)
        (*count)--;

    return 0;
}

static int buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
    enum v4l2_field field)
{
    struct timblogiw_fh *fh = vq->priv_data;
    struct timblogiw_buffer *buf = container_of(vb, struct timblogiw_buffer,
        vb);
    unsigned int data_size = timblogiw_frame_size(fh->cur_norm);
    int err = 0;

    if (vb->baddr && vb->bsize < data_size)
        /* User provided buffer, but it is too small */
        return -ENOMEM;

    vb->size = data_size;
    vb->width = fh->cur_norm->width;
    vb->height = fh->cur_norm->height;
    vb->field = field;

    if (vb->state == VIDEOBUF_NEEDS_INIT) {
        int i;
        unsigned int size;
        unsigned int bytes_per_desc = TIMBLOGIW_LINES_PER_DESC *
            timblogiw_bytes_per_line(fh->cur_norm);
        dma_addr_t addr;

        sg_init_table(buf->sg, ARRAY_SIZE(buf->sg));

        err = videobuf_iolock(vq, vb, NULL);
        if (err)
            goto err;

        addr = videobuf_to_dma_contig(vb);
        for (i = 0, size = 0; size < data_size; i++) {
            sg_dma_address(buf->sg + i) = addr + size;
            size += bytes_per_desc;
            sg_dma_len(buf->sg + i) = (size > data_size) ?
                (bytes_per_desc - (size - data_size)) :
                bytes_per_desc;
        }

        vb->state = VIDEOBUF_PREPARED;
        buf->cookie = -1;
        buf->fh = fh;
    }

    return 0;

err:
    videobuf_dma_contig_free(vq, vb);
    vb->state = VIDEOBUF_NEEDS_INIT;
    return err;
}

static void buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
{
    struct timblogiw_fh *fh = vq->priv_data;
    struct timblogiw_buffer *buf = container_of(vb, struct timblogiw_buffer,
        vb);
    struct dma_async_tx_descriptor *desc;
    int sg_elems;
    int bytes_per_desc = TIMBLOGIW_LINES_PER_DESC *
        timblogiw_bytes_per_line(fh->cur_norm);

    sg_elems = timblogiw_frame_size(fh->cur_norm) / bytes_per_desc;
    sg_elems +=
        (timblogiw_frame_size(fh->cur_norm) % bytes_per_desc) ? 1 : 0;

    if (list_empty(&fh->capture))
        vb->state = VIDEOBUF_ACTIVE;
    else
        vb->state = VIDEOBUF_QUEUED;

    list_add_tail(&vb->queue, &fh->capture);

    spin_unlock_irq(&fh->queue_lock);

    desc = dmaengine_prep_slave_sg(fh->chan,
        buf->sg, sg_elems, DMA_DEV_TO_MEM,
        DMA_PREP_INTERRUPT | DMA_COMPL_SKIP_SRC_UNMAP);
    if (!desc) {
        spin_lock_irq(&fh->queue_lock);
        list_del_init(&vb->queue);
        vb->state = VIDEOBUF_PREPARED;
        return;
    }

    desc->callback_param = buf;
    desc->callback = timblogiw_dma_cb;

    buf->cookie = desc->tx_submit(desc);

    spin_lock_irq(&fh->queue_lock);
}

static void buffer_release(struct videobuf_queue *vq,
    struct videobuf_buffer *vb)
{
    struct timblogiw_fh *fh = vq->priv_data;
    struct timblogiw_buffer *buf = container_of(vb, struct timblogiw_buffer,
        vb);

    videobuf_waiton(vq, vb, 0, 0);
    if (buf->cookie >= 0)
        dma_sync_wait(fh->chan, buf->cookie);

    videobuf_dma_contig_free(vq, vb);
    vb->state = VIDEOBUF_NEEDS_INIT;
}

static struct videobuf_queue_ops timblogiw_video_qops = {
    .buf_setup      = buffer_setup,
    .buf_prepare    = buffer_prepare,
    .buf_queue      = buffer_queue,
    .buf_release    = buffer_release,
};

/* Device Operations functions */

static int timblogiw_open(struct file *file)
{
    struct video_device *vdev = video_devdata(file);
    struct timblogiw *lw = video_get_drvdata(vdev);
    struct timblogiw_fh *fh;
    v4l2_std_id std;
    dma_cap_mask_t mask;
    int err = 0;

    dev_dbg(&vdev->dev, "%s: entry\n", __func__);

    mutex_lock(&lw->lock);
    if (lw->opened) {
        err = -EBUSY;
        goto out;
    }

    if (TIMBLOGIW_HAS_DECODER(lw) && !lw->sd_enc) {
        struct i2c_adapter *adapt;

        /* find the video decoder */
        adapt = i2c_get_adapter(lw->pdata.i2c_adapter);
        if (!adapt) {
            dev_err(&vdev->dev, "No I2C bus #%d\n",
                lw->pdata.i2c_adapter);
            err = -ENODEV;
            goto out;
        }

        /* now find the encoder */
        lw->sd_enc = v4l2_i2c_new_subdev_board(&lw->v4l2_dev, adapt,
            lw->pdata.encoder.info, NULL);

        i2c_put_adapter(adapt);

        if (!lw->sd_enc) {
            dev_err(&vdev->dev, "Failed to get encoder: %s\n",
                lw->pdata.encoder.module_name);
            err = -ENODEV;
            goto out;
        }
    }

    fh = kzalloc(sizeof(*fh), GFP_KERNEL);
    if (!fh) {
        err = -ENOMEM;
        goto out;
    }

    fh->cur_norm = timblogiw_tvnorms;
    timblogiw_querystd(file, fh, &std);
    fh->cur_norm = timblogiw_get_norm(std);

    INIT_LIST_HEAD(&fh->capture);
    spin_lock_init(&fh->queue_lock);

    dma_cap_zero(mask);
    dma_cap_set(DMA_SLAVE, mask);
    dma_cap_set(DMA_PRIVATE, mask);

    /* find the DMA channel */
    fh->chan = dma_request_channel(mask, timblogiw_dma_filter_fn,
            (void *)(uintptr_t)lw->pdata.dma_channel);
    if (!fh->chan) {
        dev_err(&vdev->dev, "Failed to get DMA channel\n");
        kfree(fh);
        err = -ENODEV;
        goto out;
    }

    file->private_data = fh;
    videobuf_queue_dma_contig_init(&fh->vb_vidq,
        &timblogiw_video_qops, lw->dev, &fh->queue_lock,
        V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE,
        sizeof(struct timblogiw_buffer), fh, NULL);

    lw->opened = true;
out:
    mutex_unlock(&lw->lock);

    return err;
}

static int timblogiw_close(struct file *file)
{
    struct video_device *vdev = video_devdata(file);
    struct timblogiw *lw = video_get_drvdata(vdev);
    struct timblogiw_fh *fh = file->private_data;

    dev_dbg(&vdev->dev, "%s: Entry\n",  __func__);

    videobuf_stop(&fh->vb_vidq);
    videobuf_mmap_free(&fh->vb_vidq);

    dma_release_channel(fh->chan);

    kfree(fh);

    mutex_lock(&lw->lock);
    lw->opened = false;
    mutex_unlock(&lw->lock);
    return 0;
}

static ssize_t timblogiw_read(struct file *file, char __user *data,
    size_t count, loff_t *ppos)
{
    struct video_device *vdev = video_devdata(file);
    struct timblogiw_fh *fh = file->private_data;

    dev_dbg(&vdev->dev, "%s: entry\n",  __func__);

    return videobuf_read_stream(&fh->vb_vidq, data, count, ppos, 0,
        file->f_flags & O_NONBLOCK);
}

static unsigned int timblogiw_poll(struct file *file,
    struct poll_table_struct *wait)
{
    struct video_device *vdev = video_devdata(file);
    struct timblogiw_fh *fh = file->private_data;

    dev_dbg(&vdev->dev, "%s: entry\n",  __func__);

    return videobuf_poll_stream(file, &fh->vb_vidq, wait);
}

static int timblogiw_mmap(struct file *file, struct vm_area_struct *vma)
{
    struct video_device *vdev = video_devdata(file);
    struct timblogiw_fh *fh = file->private_data;

    dev_dbg(&vdev->dev, "%s: entry\n", __func__);

    return videobuf_mmap_mapper(&fh->vb_vidq, vma);
}

/* Platform device functions */

static __devinitconst struct v4l2_ioctl_ops timblogiw_ioctl_ops = {
    .vidioc_querycap        = timblogiw_querycap,
    .vidioc_enum_fmt_vid_cap    = timblogiw_enum_fmt,
    .vidioc_g_fmt_vid_cap       = timblogiw_g_fmt,
    .vidioc_try_fmt_vid_cap     = timblogiw_try_fmt,
    .vidioc_s_fmt_vid_cap       = timblogiw_s_fmt,
    .vidioc_g_parm          = timblogiw_g_parm,
    .vidioc_reqbufs         = timblogiw_reqbufs,
    .vidioc_querybuf        = timblogiw_querybuf,
    .vidioc_qbuf            = timblogiw_qbuf,
    .vidioc_dqbuf           = timblogiw_dqbuf,
    .vidioc_g_std           = timblogiw_g_std,
    .vidioc_s_std           = timblogiw_s_std,
    .vidioc_enum_input      = timblogiw_enuminput,
    .vidioc_g_input         = timblogiw_g_input,
    .vidioc_s_input         = timblogiw_s_input,
    .vidioc_streamon        = timblogiw_streamon,
    .vidioc_streamoff       = timblogiw_streamoff,
    .vidioc_querystd        = timblogiw_querystd,
    .vidioc_enum_framesizes     = timblogiw_enum_framesizes,
};

static __devinitconst struct v4l2_file_operations timblogiw_fops = {
    .owner      = THIS_MODULE,
    .open       = timblogiw_open,
    .release    = timblogiw_close,
    .unlocked_ioctl     = video_ioctl2, /* V4L2 ioctl handler */
    .mmap       = timblogiw_mmap,
    .read       = timblogiw_read,
    .poll       = timblogiw_poll,
};

static __devinitconst struct video_device timblogiw_template = {
    .name       = TIMBLOGIWIN_NAME,
    .fops       = &timblogiw_fops,
    .ioctl_ops  = &timblogiw_ioctl_ops,
    .release    = video_device_release_empty,
    .minor      = -1,
    .tvnorms    = V4L2_STD_PAL | V4L2_STD_NTSC
};

static int __devinit timblogiw_probe(struct platform_device *pdev)
{
    int err;
    struct timblogiw *lw = NULL;
    struct timb_video_platform_data *pdata = pdev->dev.platform_data;

    if (!pdata) {
        dev_err(&pdev->dev, "No platform data\n");
        err = -EINVAL;
        goto err;
    }

    if (!pdata->encoder.module_name)
        dev_info(&pdev->dev, "Running without decoder\n");

    lw = kzalloc(sizeof(*lw), GFP_KERNEL);
    if (!lw) {
        err = -ENOMEM;
        goto err;
    }

    if (pdev->dev.parent)
        lw->dev = pdev->dev.parent;
    else
        lw->dev = &pdev->dev;

    memcpy(&lw->pdata, pdata, sizeof(lw->pdata));

    mutex_init(&lw->lock);

    lw->video_dev = timblogiw_template;

    strlcpy(lw->v4l2_dev.name, DRIVER_NAME, sizeof(lw->v4l2_dev.name));
    err = v4l2_device_register(NULL, &lw->v4l2_dev);
    if (err)
        goto err_register;

    lw->video_dev.v4l2_dev = &lw->v4l2_dev;

    platform_set_drvdata(pdev, lw);
    video_set_drvdata(&lw->video_dev, lw);

    err = video_register_device(&lw->video_dev, VFL_TYPE_GRABBER, 0);
    if (err) {
        dev_err(&pdev->dev, "Error reg video: %d\n", err);
        goto err_request;
    }


    return 0;

err_request:
    platform_set_drvdata(pdev, NULL);
    v4l2_device_unregister(&lw->v4l2_dev);
err_register:
    kfree(lw);
err:
    dev_err(&pdev->dev, "Failed to register: %d\n", err);

    return err;
}

static int __devexit timblogiw_remove(struct platform_device *pdev)
{
    struct timblogiw *lw = platform_get_drvdata(pdev);

    video_unregister_device(&lw->video_dev);

    v4l2_device_unregister(&lw->v4l2_dev);

    kfree(lw);

    platform_set_drvdata(pdev, NULL);

    return 0;
}

static struct platform_driver timblogiw_platform_driver = {
    .driver = {
        .name   = DRIVER_NAME,
        .owner  = THIS_MODULE,
    },
    .probe      = timblogiw_probe,
    .remove     = __devexit_p(timblogiw_remove),
};

module_platform_driver(timblogiw_platform_driver);

MODULE_DESCRIPTION(TIMBLOGIWIN_NAME);
MODULE_AUTHOR("Pelagicore AB <[email protected]>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:"DRIVER_NAME);