bfin_capture.c

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/*
 * Analog Devices video capture driver
 *
 * Copyright (c) 2011 Analog Devices Inc.
 *
 * 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.
 */

#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/types.h>

#include <media/v4l2-chip-ident.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/videobuf2-dma-contig.h>

#include <asm/dma.h>

#include <media/blackfin/bfin_capture.h>
#include <media/blackfin/ppi.h>

#define CAPTURE_DRV_NAME        "bfin_capture"
#define BCAP_MIN_NUM_BUF        2

struct bcap_format {
    char *desc;
    u32 pixelformat;
    enum v4l2_mbus_pixelcode mbus_code;
    int bpp; /* bits per pixel */
};

struct bcap_buffer {
    struct vb2_buffer vb;
    struct list_head list;
};

struct bcap_device {
    /* capture device instance */
    struct v4l2_device v4l2_dev;
    /* v4l2 control handler */
    struct v4l2_ctrl_handler ctrl_handler;
    /* device node data */
    struct video_device *video_dev;
    /* sub device instance */
    struct v4l2_subdev *sd;
    /* capture config */
    struct bfin_capture_config *cfg;
    /* ppi interface */
    struct ppi_if *ppi;
    /* current input */
    unsigned int cur_input;
    /* current selected standard */
    v4l2_std_id std;
    /* used to store pixel format */
    struct v4l2_pix_format fmt;
    /* bits per pixel*/
    int bpp;
    /* used to store sensor supported format */
    struct bcap_format *sensor_formats;
    /* number of sensor formats array */
    int num_sensor_formats;
    /* pointing to current video buffer */
    struct bcap_buffer *cur_frm;
    /* pointing to next video buffer */
    struct bcap_buffer *next_frm;
    /* buffer queue used in videobuf2 */
    struct vb2_queue buffer_queue;
    /* allocator-specific contexts for each plane */
    struct vb2_alloc_ctx *alloc_ctx;
    /* queue of filled frames */
    struct list_head dma_queue;
    /* used in videobuf2 callback */
    spinlock_t lock;
    /* used to access capture device */
    struct mutex mutex;
    /* used to wait ppi to complete one transfer */
    struct completion comp;
    /* prepare to stop */
    bool stop;
};

struct bcap_fh {
    struct v4l2_fh fh;
    /* indicates whether this file handle is doing IO */
    bool io_allowed;
};

static const struct bcap_format bcap_formats[] = {
    {
        .desc        = "YCbCr 4:2:2 Interleaved UYVY",
        .pixelformat = V4L2_PIX_FMT_UYVY,
        .mbus_code   = V4L2_MBUS_FMT_UYVY8_2X8,
        .bpp         = 16,
    },
    {
        .desc        = "YCbCr 4:2:2 Interleaved YUYV",
        .pixelformat = V4L2_PIX_FMT_YUYV,
        .mbus_code   = V4L2_MBUS_FMT_YUYV8_2X8,
        .bpp         = 16,
    },
    {
        .desc        = "RGB 565",
        .pixelformat = V4L2_PIX_FMT_RGB565,
        .mbus_code   = V4L2_MBUS_FMT_RGB565_2X8_LE,
        .bpp         = 16,
    },
    {
        .desc        = "RGB 444",
        .pixelformat = V4L2_PIX_FMT_RGB444,
        .mbus_code   = V4L2_MBUS_FMT_RGB444_2X8_PADHI_LE,
        .bpp         = 16,
    },

};
#define BCAP_MAX_FMTS ARRAY_SIZE(bcap_formats)

static irqreturn_t bcap_isr(int irq, void *dev_id);

static struct bcap_buffer *to_bcap_vb(struct vb2_buffer *vb)
{
    return container_of(vb, struct bcap_buffer, vb);
}

static int bcap_init_sensor_formats(struct bcap_device *bcap_dev)
{
    enum v4l2_mbus_pixelcode code;
    struct bcap_format *sf;
    unsigned int num_formats = 0;
    int i, j;

    while (!v4l2_subdev_call(bcap_dev->sd, video,
                enum_mbus_fmt, num_formats, &code))
        num_formats++;
    if (!num_formats)
        return -ENXIO;

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

    for (i = 0; i < num_formats; i++) {
        v4l2_subdev_call(bcap_dev->sd, video,
                enum_mbus_fmt, i, &code);
        for (j = 0; j < BCAP_MAX_FMTS; j++)
            if (code == bcap_formats[j].mbus_code)
                break;
        if (j == BCAP_MAX_FMTS) {
            /* we don't allow this sensor working with our bridge */
            kfree(sf);
            return -EINVAL;
        }
        sf[i] = bcap_formats[j];
    }
    bcap_dev->sensor_formats = sf;
    bcap_dev->num_sensor_formats = num_formats;
    return 0;
}

static void bcap_free_sensor_formats(struct bcap_device *bcap_dev)
{
    bcap_dev->num_sensor_formats = 0;
    kfree(bcap_dev->sensor_formats);
    bcap_dev->sensor_formats = NULL;
}

static int bcap_open(struct file *file)
{
    struct bcap_device *bcap_dev = video_drvdata(file);
    struct video_device *vfd = bcap_dev->video_dev;
    struct bcap_fh *bcap_fh;

    if (!bcap_dev->sd) {
        v4l2_err(&bcap_dev->v4l2_dev, "No sub device registered\n");
        return -ENODEV;
    }

    bcap_fh = kzalloc(sizeof(*bcap_fh), GFP_KERNEL);
    if (!bcap_fh) {
        v4l2_err(&bcap_dev->v4l2_dev,
             "unable to allocate memory for file handle object\n");
        return -ENOMEM;
    }

    v4l2_fh_init(&bcap_fh->fh, vfd);

    /* store pointer to v4l2_fh in private_data member of file */
    file->private_data = &bcap_fh->fh;
    v4l2_fh_add(&bcap_fh->fh);
    bcap_fh->io_allowed = false;
    return 0;
}

static int bcap_release(struct file *file)
{
    struct bcap_device *bcap_dev = video_drvdata(file);
    struct v4l2_fh *fh = file->private_data;
    struct bcap_fh *bcap_fh = container_of(fh, struct bcap_fh, fh);

    /* if this instance is doing IO */
    if (bcap_fh->io_allowed)
        vb2_queue_release(&bcap_dev->buffer_queue);

    file->private_data = NULL;
    v4l2_fh_del(&bcap_fh->fh);
    v4l2_fh_exit(&bcap_fh->fh);
    kfree(bcap_fh);
    return 0;
}

static int bcap_mmap(struct file *file, struct vm_area_struct *vma)
{
    struct bcap_device *bcap_dev = video_drvdata(file);
    int ret;

    if (mutex_lock_interruptible(&bcap_dev->mutex))
        return -ERESTARTSYS;
    ret = vb2_mmap(&bcap_dev->buffer_queue, vma);
    mutex_unlock(&bcap_dev->mutex);
    return ret;
}

#ifndef CONFIG_MMU
static unsigned long bcap_get_unmapped_area(struct file *file,
                        unsigned long addr,
                        unsigned long len,
                        unsigned long pgoff,
                        unsigned long flags)
{
    struct bcap_device *bcap_dev = video_drvdata(file);

    return vb2_get_unmapped_area(&bcap_dev->buffer_queue,
                     addr,
                     len,
                     pgoff,
                     flags);
}
#endif

static unsigned int bcap_poll(struct file *file, poll_table *wait)
{
    struct bcap_device *bcap_dev = video_drvdata(file);
    unsigned int res;

    mutex_lock(&bcap_dev->mutex);
    res = vb2_poll(&bcap_dev->buffer_queue, file, wait);
    mutex_unlock(&bcap_dev->mutex);
    return res;
}

static int bcap_queue_setup(struct vb2_queue *vq,
                const struct v4l2_format *fmt,
                unsigned int *nbuffers, unsigned int *nplanes,
                unsigned int sizes[], void *alloc_ctxs[])
{
    struct bcap_device *bcap_dev = vb2_get_drv_priv(vq);

    if (*nbuffers < BCAP_MIN_NUM_BUF)
        *nbuffers = BCAP_MIN_NUM_BUF;

    *nplanes = 1;
    sizes[0] = bcap_dev->fmt.sizeimage;
    alloc_ctxs[0] = bcap_dev->alloc_ctx;

    return 0;
}

static int bcap_buffer_init(struct vb2_buffer *vb)
{
    struct bcap_buffer *buf = to_bcap_vb(vb);

    INIT_LIST_HEAD(&buf->list);
    return 0;
}

static int bcap_buffer_prepare(struct vb2_buffer *vb)
{
    struct bcap_device *bcap_dev = vb2_get_drv_priv(vb->vb2_queue);
    struct bcap_buffer *buf = to_bcap_vb(vb);
    unsigned long size;

    size = bcap_dev->fmt.sizeimage;
    if (vb2_plane_size(vb, 0) < size) {
        v4l2_err(&bcap_dev->v4l2_dev, "buffer too small (%lu < %lu)\n",
                vb2_plane_size(vb, 0), size);
        return -EINVAL;
    }
    vb2_set_plane_payload(&buf->vb, 0, size);

    return 0;
}

static void bcap_buffer_queue(struct vb2_buffer *vb)
{
    struct bcap_device *bcap_dev = vb2_get_drv_priv(vb->vb2_queue);
    struct bcap_buffer *buf = to_bcap_vb(vb);
    unsigned long flags;

    spin_lock_irqsave(&bcap_dev->lock, flags);
    list_add_tail(&buf->list, &bcap_dev->dma_queue);
    spin_unlock_irqrestore(&bcap_dev->lock, flags);
}

static void bcap_buffer_cleanup(struct vb2_buffer *vb)
{
    struct bcap_device *bcap_dev = vb2_get_drv_priv(vb->vb2_queue);
    struct bcap_buffer *buf = to_bcap_vb(vb);
    unsigned long flags;

    spin_lock_irqsave(&bcap_dev->lock, flags);
    list_del_init(&buf->list);
    spin_unlock_irqrestore(&bcap_dev->lock, flags);
}

static void bcap_lock(struct vb2_queue *vq)
{
    struct bcap_device *bcap_dev = vb2_get_drv_priv(vq);
    mutex_lock(&bcap_dev->mutex);
}

static void bcap_unlock(struct vb2_queue *vq)
{
    struct bcap_device *bcap_dev = vb2_get_drv_priv(vq);
    mutex_unlock(&bcap_dev->mutex);
}

static int bcap_start_streaming(struct vb2_queue *vq, unsigned int count)
{
    struct bcap_device *bcap_dev = vb2_get_drv_priv(vq);
    struct ppi_if *ppi = bcap_dev->ppi;
    struct ppi_params params;
    int ret;

    /* enable streamon on the sub device */
    ret = v4l2_subdev_call(bcap_dev->sd, video, s_stream, 1);
    if (ret && (ret != -ENOIOCTLCMD)) {
        v4l2_err(&bcap_dev->v4l2_dev, "stream on failed in subdev\n");
        return ret;
    }

    /* set ppi params */
    params.width = bcap_dev->fmt.width;
    params.height = bcap_dev->fmt.height;
    params.bpp = bcap_dev->bpp;
    params.ppi_control = bcap_dev->cfg->ppi_control;
    params.int_mask = bcap_dev->cfg->int_mask;
    params.blank_clocks = bcap_dev->cfg->blank_clocks;
    ret = ppi->ops->set_params(ppi, &params);
    if (ret < 0) {
        v4l2_err(&bcap_dev->v4l2_dev,
                "Error in setting ppi params\n");
        return ret;
    }

    /* attach ppi DMA irq handler */
    ret = ppi->ops->attach_irq(ppi, bcap_isr);
    if (ret < 0) {
        v4l2_err(&bcap_dev->v4l2_dev,
                "Error in attaching interrupt handler\n");
        return ret;
    }

    INIT_COMPLETION(bcap_dev->comp);
    bcap_dev->stop = false;
    return 0;
}

static int bcap_stop_streaming(struct vb2_queue *vq)
{
    struct bcap_device *bcap_dev = vb2_get_drv_priv(vq);
    struct ppi_if *ppi = bcap_dev->ppi;
    int ret;

    if (!vb2_is_streaming(vq))
        return 0;

    bcap_dev->stop = true;
    wait_for_completion(&bcap_dev->comp);
    ppi->ops->stop(ppi);
    ppi->ops->detach_irq(ppi);
    ret = v4l2_subdev_call(bcap_dev->sd, video, s_stream, 0);
    if (ret && (ret != -ENOIOCTLCMD))
        v4l2_err(&bcap_dev->v4l2_dev,
                "stream off failed in subdev\n");

    /* release all active buffers */
    while (!list_empty(&bcap_dev->dma_queue)) {
        bcap_dev->next_frm = list_entry(bcap_dev->dma_queue.next,
                        struct bcap_buffer, list);
        list_del(&bcap_dev->next_frm->list);
        vb2_buffer_done(&bcap_dev->next_frm->vb, VB2_BUF_STATE_ERROR);
    }
    return 0;
}

static struct vb2_ops bcap_video_qops = {
    .queue_setup            = bcap_queue_setup,
    .buf_init               = bcap_buffer_init,
    .buf_prepare            = bcap_buffer_prepare,
    .buf_cleanup            = bcap_buffer_cleanup,
    .buf_queue              = bcap_buffer_queue,
    .wait_prepare           = bcap_unlock,
    .wait_finish            = bcap_lock,
    .start_streaming        = bcap_start_streaming,
    .stop_streaming         = bcap_stop_streaming,
};

static int bcap_reqbufs(struct file *file, void *priv,
            struct v4l2_requestbuffers *req_buf)
{
    struct bcap_device *bcap_dev = video_drvdata(file);
    struct vb2_queue *vq = &bcap_dev->buffer_queue;
    struct v4l2_fh *fh = file->private_data;
    struct bcap_fh *bcap_fh = container_of(fh, struct bcap_fh, fh);

    if (vb2_is_busy(vq))
        return -EBUSY;

    bcap_fh->io_allowed = true;

    return vb2_reqbufs(vq, req_buf);
}

static int bcap_querybuf(struct file *file, void *priv,
                struct v4l2_buffer *buf)
{
    struct bcap_device *bcap_dev = video_drvdata(file);

    return vb2_querybuf(&bcap_dev->buffer_queue, buf);
}

static int bcap_qbuf(struct file *file, void *priv,
            struct v4l2_buffer *buf)
{
    struct bcap_device *bcap_dev = video_drvdata(file);
    struct v4l2_fh *fh = file->private_data;
    struct bcap_fh *bcap_fh = container_of(fh, struct bcap_fh, fh);

    if (!bcap_fh->io_allowed)
        return -EBUSY;

    return vb2_qbuf(&bcap_dev->buffer_queue, buf);
}

static int bcap_dqbuf(struct file *file, void *priv,
            struct v4l2_buffer *buf)
{
    struct bcap_device *bcap_dev = video_drvdata(file);
    struct v4l2_fh *fh = file->private_data;
    struct bcap_fh *bcap_fh = container_of(fh, struct bcap_fh, fh);

    if (!bcap_fh->io_allowed)
        return -EBUSY;

    return vb2_dqbuf(&bcap_dev->buffer_queue,
                buf, file->f_flags & O_NONBLOCK);
}

static irqreturn_t bcap_isr(int irq, void *dev_id)
{
    struct ppi_if *ppi = dev_id;
    struct bcap_device *bcap_dev = ppi->priv;
    struct timeval timevalue;
    struct vb2_buffer *vb = &bcap_dev->cur_frm->vb;
    dma_addr_t addr;

    spin_lock(&bcap_dev->lock);

    if (bcap_dev->cur_frm != bcap_dev->next_frm) {
        do_gettimeofday(&timevalue);
        vb->v4l2_buf.timestamp = timevalue;
        vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
        bcap_dev->cur_frm = bcap_dev->next_frm;
    }

    ppi->ops->stop(ppi);

    if (bcap_dev->stop) {
        complete(&bcap_dev->comp);
    } else {
        if (!list_empty(&bcap_dev->dma_queue)) {
            bcap_dev->next_frm = list_entry(bcap_dev->dma_queue.next,
                        struct bcap_buffer, list);
            list_del(&bcap_dev->next_frm->list);
            addr = vb2_dma_contig_plane_dma_addr(&bcap_dev->next_frm->vb, 0);
            ppi->ops->update_addr(ppi, (unsigned long)addr);
        }
        ppi->ops->start(ppi);
    }

    spin_unlock(&bcap_dev->lock);

    return IRQ_HANDLED;
}

static int bcap_streamon(struct file *file, void *priv,
                enum v4l2_buf_type buf_type)
{
    struct bcap_device *bcap_dev = video_drvdata(file);
    struct bcap_fh *fh = file->private_data;
    struct ppi_if *ppi = bcap_dev->ppi;
    dma_addr_t addr;
    int ret;

    if (!fh->io_allowed)
        return -EBUSY;

    /* call streamon to start streaming in videobuf */
    ret = vb2_streamon(&bcap_dev->buffer_queue, buf_type);
    if (ret)
        return ret;

    /* if dma queue is empty, return error */
    if (list_empty(&bcap_dev->dma_queue)) {
        v4l2_err(&bcap_dev->v4l2_dev, "dma queue is empty\n");
        ret = -EINVAL;
        goto err;
    }

    /* get the next frame from the dma queue */
    bcap_dev->next_frm = list_entry(bcap_dev->dma_queue.next,
                    struct bcap_buffer, list);
    bcap_dev->cur_frm = bcap_dev->next_frm;
    /* remove buffer from the dma queue */
    list_del(&bcap_dev->cur_frm->list);
    addr = vb2_dma_contig_plane_dma_addr(&bcap_dev->cur_frm->vb, 0);
    /* update DMA address */
    ppi->ops->update_addr(ppi, (unsigned long)addr);
    /* enable ppi */
    ppi->ops->start(ppi);

    return 0;
err:
    vb2_streamoff(&bcap_dev->buffer_queue, buf_type);
    return ret;
}

static int bcap_streamoff(struct file *file, void *priv,
                enum v4l2_buf_type buf_type)
{
    struct bcap_device *bcap_dev = video_drvdata(file);
    struct bcap_fh *fh = file->private_data;

    if (!fh->io_allowed)
        return -EBUSY;

    return vb2_streamoff(&bcap_dev->buffer_queue, buf_type);
}

static int bcap_querystd(struct file *file, void *priv, v4l2_std_id *std)
{
    struct bcap_device *bcap_dev = video_drvdata(file);

    return v4l2_subdev_call(bcap_dev->sd, video, querystd, std);
}

static int bcap_g_std(struct file *file, void *priv, v4l2_std_id *std)
{
    struct bcap_device *bcap_dev = video_drvdata(file);

    *std = bcap_dev->std;
    return 0;
}

static int bcap_s_std(struct file *file, void *priv, v4l2_std_id *std)
{
    struct bcap_device *bcap_dev = video_drvdata(file);
    int ret;

    if (vb2_is_busy(&bcap_dev->buffer_queue))
        return -EBUSY;

    ret = v4l2_subdev_call(bcap_dev->sd, core, s_std, *std);
    if (ret < 0)
        return ret;

    bcap_dev->std = *std;
    return 0;
}

static int bcap_enum_input(struct file *file, void *priv,
                struct v4l2_input *input)
{
    struct bcap_device *bcap_dev = video_drvdata(file);
    struct bfin_capture_config *config = bcap_dev->cfg;
    int ret;
    u32 status;

    if (input->index >= config->num_inputs)
        return -EINVAL;

    *input = config->inputs[input->index];
    /* get input status */
    ret = v4l2_subdev_call(bcap_dev->sd, video, g_input_status, &status);
    if (!ret)
        input->status = status;
    return 0;
}

static int bcap_g_input(struct file *file, void *priv, unsigned int *index)
{
    struct bcap_device *bcap_dev = video_drvdata(file);

    *index = bcap_dev->cur_input;
    return 0;
}

static int bcap_s_input(struct file *file, void *priv, unsigned int index)
{
    struct bcap_device *bcap_dev = video_drvdata(file);
    struct bfin_capture_config *config = bcap_dev->cfg;
    struct bcap_route *route;
    int ret;

    if (vb2_is_busy(&bcap_dev->buffer_queue))
        return -EBUSY;

    if (index >= config->num_inputs)
        return -EINVAL;

    route = &config->routes[index];
    ret = v4l2_subdev_call(bcap_dev->sd, video, s_routing,
                route->input, route->output, 0);
    if ((ret < 0) && (ret != -ENOIOCTLCMD)) {
        v4l2_err(&bcap_dev->v4l2_dev, "Failed to set input\n");
        return ret;
    }
    bcap_dev->cur_input = index;
    return 0;
}

static int bcap_try_format(struct bcap_device *bcap,
                struct v4l2_pix_format *pixfmt,
                enum v4l2_mbus_pixelcode *mbus_code,
                int *bpp)
{
    struct bcap_format *sf = bcap->sensor_formats;
    struct bcap_format *fmt = NULL;
    struct v4l2_mbus_framefmt mbus_fmt;
    int ret, i;

    for (i = 0; i < bcap->num_sensor_formats; i++) {
        fmt = &sf[i];
        if (pixfmt->pixelformat == fmt->pixelformat)
            break;
    }
    if (i == bcap->num_sensor_formats)
        fmt = &sf[0];

    if (mbus_code)
        *mbus_code = fmt->mbus_code;
    if (bpp)
        *bpp = fmt->bpp;
    v4l2_fill_mbus_format(&mbus_fmt, pixfmt, fmt->mbus_code);
    ret = v4l2_subdev_call(bcap->sd, video,
                try_mbus_fmt, &mbus_fmt);
    if (ret < 0)
        return ret;
    v4l2_fill_pix_format(pixfmt, &mbus_fmt);
    pixfmt->bytesperline = pixfmt->width * fmt->bpp / 8;
    pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height;
    return 0;
}

static int bcap_enum_fmt_vid_cap(struct file *file, void  *priv,
                    struct v4l2_fmtdesc *fmt)
{
    struct bcap_device *bcap_dev = video_drvdata(file);
    struct bcap_format *sf = bcap_dev->sensor_formats;

    if (fmt->index >= bcap_dev->num_sensor_formats)
        return -EINVAL;

    fmt->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    strlcpy(fmt->description,
        sf[fmt->index].desc,
        sizeof(fmt->description));
    fmt->pixelformat = sf[fmt->index].pixelformat;
    return 0;
}

static int bcap_try_fmt_vid_cap(struct file *file, void *priv,
                    struct v4l2_format *fmt)
{
    struct bcap_device *bcap_dev = video_drvdata(file);
    struct v4l2_pix_format *pixfmt = &fmt->fmt.pix;

    return bcap_try_format(bcap_dev, pixfmt, NULL, NULL);
}

static int bcap_g_fmt_vid_cap(struct file *file, void *priv,
                struct v4l2_format *fmt)
{
    struct bcap_device *bcap_dev = video_drvdata(file);

    fmt->fmt.pix = bcap_dev->fmt;
    return 0;
}

static int bcap_s_fmt_vid_cap(struct file *file, void *priv,
                struct v4l2_format *fmt)
{
    struct bcap_device *bcap_dev = video_drvdata(file);
    struct v4l2_mbus_framefmt mbus_fmt;
    enum v4l2_mbus_pixelcode mbus_code;
    struct v4l2_pix_format *pixfmt = &fmt->fmt.pix;
    int ret, bpp;

    if (vb2_is_busy(&bcap_dev->buffer_queue))
        return -EBUSY;

    /* see if format works */
    ret = bcap_try_format(bcap_dev, pixfmt, &mbus_code, &bpp);
    if (ret < 0)
        return ret;

    v4l2_fill_mbus_format(&mbus_fmt, pixfmt, mbus_code);
    ret = v4l2_subdev_call(bcap_dev->sd, video, s_mbus_fmt, &mbus_fmt);
    if (ret < 0)
        return ret;
    bcap_dev->fmt = *pixfmt;
    bcap_dev->bpp = bpp;
    return 0;
}

static int bcap_querycap(struct file *file, void  *priv,
                struct v4l2_capability *cap)
{
    struct bcap_device *bcap_dev = video_drvdata(file);

    cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
    strlcpy(cap->driver, CAPTURE_DRV_NAME, sizeof(cap->driver));
    strlcpy(cap->bus_info, "Blackfin Platform", sizeof(cap->bus_info));
    strlcpy(cap->card, bcap_dev->cfg->card_name, sizeof(cap->card));
    return 0;
}

static int bcap_g_parm(struct file *file, void *fh,
                struct v4l2_streamparm *a)
{
    struct bcap_device *bcap_dev = video_drvdata(file);

    if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
        return -EINVAL;
    return v4l2_subdev_call(bcap_dev->sd, video, g_parm, a);
}

static int bcap_s_parm(struct file *file, void *fh,
                struct v4l2_streamparm *a)
{
    struct bcap_device *bcap_dev = video_drvdata(file);

    if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
        return -EINVAL;
    return v4l2_subdev_call(bcap_dev->sd, video, s_parm, a);
}

static int bcap_g_chip_ident(struct file *file, void *priv,
        struct v4l2_dbg_chip_ident *chip)
{
    struct bcap_device *bcap_dev = video_drvdata(file);

    chip->ident = V4L2_IDENT_NONE;
    chip->revision = 0;
    if (chip->match.type != V4L2_CHIP_MATCH_I2C_DRIVER &&
            chip->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
        return -EINVAL;

    return v4l2_subdev_call(bcap_dev->sd, core,
            g_chip_ident, chip);
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int bcap_dbg_g_register(struct file *file, void *priv,
        struct v4l2_dbg_register *reg)
{
    struct bcap_device *bcap_dev = video_drvdata(file);

    return v4l2_subdev_call(bcap_dev->sd, core,
            g_register, reg);
}

static int bcap_dbg_s_register(struct file *file, void *priv,
        struct v4l2_dbg_register *reg)
{
    struct bcap_device *bcap_dev = video_drvdata(file);

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

static int bcap_log_status(struct file *file, void *priv)
{
    struct bcap_device *bcap_dev = video_drvdata(file);
    /* status for sub devices */
    v4l2_device_call_all(&bcap_dev->v4l2_dev, 0, core, log_status);
    return 0;
}

static const struct v4l2_ioctl_ops bcap_ioctl_ops = {
    .vidioc_querycap         = bcap_querycap,
    .vidioc_g_fmt_vid_cap    = bcap_g_fmt_vid_cap,
    .vidioc_enum_fmt_vid_cap = bcap_enum_fmt_vid_cap,
    .vidioc_s_fmt_vid_cap    = bcap_s_fmt_vid_cap,
    .vidioc_try_fmt_vid_cap  = bcap_try_fmt_vid_cap,
    .vidioc_enum_input       = bcap_enum_input,
    .vidioc_g_input          = bcap_g_input,
    .vidioc_s_input          = bcap_s_input,
    .vidioc_querystd         = bcap_querystd,
    .vidioc_s_std            = bcap_s_std,
    .vidioc_g_std            = bcap_g_std,
    .vidioc_reqbufs          = bcap_reqbufs,
    .vidioc_querybuf         = bcap_querybuf,
    .vidioc_qbuf             = bcap_qbuf,
    .vidioc_dqbuf            = bcap_dqbuf,
    .vidioc_streamon         = bcap_streamon,
    .vidioc_streamoff        = bcap_streamoff,
    .vidioc_g_parm           = bcap_g_parm,
    .vidioc_s_parm           = bcap_s_parm,
    .vidioc_g_chip_ident     = bcap_g_chip_ident,
#ifdef CONFIG_VIDEO_ADV_DEBUG
    .vidioc_g_register       = bcap_dbg_g_register,
    .vidioc_s_register       = bcap_dbg_s_register,
#endif
    .vidioc_log_status       = bcap_log_status,
};

static struct v4l2_file_operations bcap_fops = {
    .owner = THIS_MODULE,
    .open = bcap_open,
    .release = bcap_release,
    .unlocked_ioctl = video_ioctl2,
    .mmap = bcap_mmap,
#ifndef CONFIG_MMU
    .get_unmapped_area = bcap_get_unmapped_area,
#endif
    .poll = bcap_poll
};

static int __devinit bcap_probe(struct platform_device *pdev)
{
    struct bcap_device *bcap_dev;
    struct video_device *vfd;
    struct i2c_adapter *i2c_adap;
    struct bfin_capture_config *config;
    struct vb2_queue *q;
    int ret;

    config = pdev->dev.platform_data;
    if (!config) {
        v4l2_err(pdev->dev.driver, "Unable to get board config\n");
        return -ENODEV;
    }

    bcap_dev = kzalloc(sizeof(*bcap_dev), GFP_KERNEL);
    if (!bcap_dev) {
        v4l2_err(pdev->dev.driver, "Unable to alloc bcap_dev\n");
        return -ENOMEM;
    }

    bcap_dev->cfg = config;

    bcap_dev->ppi = ppi_create_instance(config->ppi_info);
    if (!bcap_dev->ppi) {
        v4l2_err(pdev->dev.driver, "Unable to create ppi\n");
        ret = -ENODEV;
        goto err_free_dev;
    }
    bcap_dev->ppi->priv = bcap_dev;

    bcap_dev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
    if (IS_ERR(bcap_dev->alloc_ctx)) {
        ret = PTR_ERR(bcap_dev->alloc_ctx);
        goto err_free_ppi;
    }

    vfd = video_device_alloc();
    if (!vfd) {
        ret = -ENOMEM;
        v4l2_err(pdev->dev.driver, "Unable to alloc video device\n");
        goto err_cleanup_ctx;
    }

    /* initialize field of video device */
    vfd->release            = video_device_release;
    vfd->fops               = &bcap_fops;
    vfd->ioctl_ops          = &bcap_ioctl_ops;
    vfd->tvnorms            = 0;
    vfd->v4l2_dev           = &bcap_dev->v4l2_dev;
    set_bit(V4L2_FL_USE_FH_PRIO, &vfd->flags);
    strncpy(vfd->name, CAPTURE_DRV_NAME, sizeof(vfd->name));
    bcap_dev->video_dev     = vfd;

    ret = v4l2_device_register(&pdev->dev, &bcap_dev->v4l2_dev);
    if (ret) {
        v4l2_err(pdev->dev.driver,
                "Unable to register v4l2 device\n");
        goto err_release_vdev;
    }
    v4l2_info(&bcap_dev->v4l2_dev, "v4l2 device registered\n");

    bcap_dev->v4l2_dev.ctrl_handler = &bcap_dev->ctrl_handler;
    ret = v4l2_ctrl_handler_init(&bcap_dev->ctrl_handler, 0);
    if (ret) {
        v4l2_err(&bcap_dev->v4l2_dev,
                "Unable to init control handler\n");
        goto err_unreg_v4l2;
    }

    spin_lock_init(&bcap_dev->lock);
    /* initialize queue */
    q = &bcap_dev->buffer_queue;
    q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    q->io_modes = VB2_MMAP;
    q->drv_priv = bcap_dev;
    q->buf_struct_size = sizeof(struct bcap_buffer);
    q->ops = &bcap_video_qops;
    q->mem_ops = &vb2_dma_contig_memops;

    vb2_queue_init(q);

    mutex_init(&bcap_dev->mutex);
    init_completion(&bcap_dev->comp);

    /* init video dma queues */
    INIT_LIST_HEAD(&bcap_dev->dma_queue);

    vfd->lock = &bcap_dev->mutex;

    /* register video device */
    ret = video_register_device(bcap_dev->video_dev, VFL_TYPE_GRABBER, -1);
    if (ret) {
        v4l2_err(&bcap_dev->v4l2_dev,
                "Unable to register video device\n");
        goto err_free_handler;
    }
    video_set_drvdata(bcap_dev->video_dev, bcap_dev);
    v4l2_info(&bcap_dev->v4l2_dev, "video device registered as: %s\n",
            video_device_node_name(vfd));

    /* load up the subdevice */
    i2c_adap = i2c_get_adapter(config->i2c_adapter_id);
    if (!i2c_adap) {
        v4l2_err(&bcap_dev->v4l2_dev,
                "Unable to find i2c adapter\n");
        ret = -ENODEV;
        goto err_unreg_vdev;

    }
    bcap_dev->sd = v4l2_i2c_new_subdev_board(&bcap_dev->v4l2_dev,
                         i2c_adap,
                         &config->board_info,
                         NULL);
    if (bcap_dev->sd) {
        int i;
        /* update tvnorms from the sub devices */
        for (i = 0; i < config->num_inputs; i++)
            vfd->tvnorms |= config->inputs[i].std;
    } else {
        v4l2_err(&bcap_dev->v4l2_dev,
                "Unable to register sub device\n");
        goto err_unreg_vdev;
    }

    v4l2_info(&bcap_dev->v4l2_dev, "v4l2 sub device registered\n");

    /* now we can probe the default state */
    if (vfd->tvnorms) {
        v4l2_std_id std;
        ret = v4l2_subdev_call(bcap_dev->sd, core, g_std, &std);
        if (ret) {
            v4l2_err(&bcap_dev->v4l2_dev,
                    "Unable to get std\n");
            goto err_unreg_vdev;
        }
        bcap_dev->std = std;
    }
    ret = bcap_init_sensor_formats(bcap_dev);
    if (ret) {
        v4l2_err(&bcap_dev->v4l2_dev,
                "Unable to create sensor formats table\n");
        goto err_unreg_vdev;
    }
    return 0;
err_unreg_vdev:
    video_unregister_device(bcap_dev->video_dev);
    bcap_dev->video_dev = NULL;
err_free_handler:
    v4l2_ctrl_handler_free(&bcap_dev->ctrl_handler);
err_unreg_v4l2:
    v4l2_device_unregister(&bcap_dev->v4l2_dev);
err_release_vdev:
    if (bcap_dev->video_dev)
        video_device_release(bcap_dev->video_dev);
err_cleanup_ctx:
    vb2_dma_contig_cleanup_ctx(bcap_dev->alloc_ctx);
err_free_ppi:
    ppi_delete_instance(bcap_dev->ppi);
err_free_dev:
    kfree(bcap_dev);
    return ret;
}

static int __devexit bcap_remove(struct platform_device *pdev)
{
    struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
    struct bcap_device *bcap_dev = container_of(v4l2_dev,
                        struct bcap_device, v4l2_dev);

    bcap_free_sensor_formats(bcap_dev);
    video_unregister_device(bcap_dev->video_dev);
    v4l2_ctrl_handler_free(&bcap_dev->ctrl_handler);
    v4l2_device_unregister(v4l2_dev);
    vb2_dma_contig_cleanup_ctx(bcap_dev->alloc_ctx);
    ppi_delete_instance(bcap_dev->ppi);
    kfree(bcap_dev);
    return 0;
}

static struct platform_driver bcap_driver = {
    .driver = {
        .name  = CAPTURE_DRV_NAME,
        .owner = THIS_MODULE,
    },
    .probe = bcap_probe,
    .remove = __devexit_p(bcap_remove),
};

static __init int bcap_init(void)
{
    return platform_driver_register(&bcap_driver);
}

static __exit void bcap_exit(void)
{
    platform_driver_unregister(&bcap_driver);
}

module_init(bcap_init);
module_exit(bcap_exit);

MODULE_DESCRIPTION("Analog Devices blackfin video capture driver");
MODULE_AUTHOR("Scott Jiang <[email protected]>");
MODULE_LICENSE("GPL v2");