// SPDX-License-Identifier: GPL-2.0-only
/*
 * ispvideo.c
 *
 * TI OMAP3 ISP - Generic video node
 *
 * Copyright (C) 2009-2010 Nokia Corporation
 *
 * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 *           Sakari Ailus <sakari.ailus@iki.fi>
 */

#include <linux/clk.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/pagemap.h>
#include <linux/scatterlist.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>

#include <media/v4l2-dev.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-mc.h>
#include <media/videobuf2-dma-contig.h>

#include "ispvideo.h"
#include "isp.h"


/* -----------------------------------------------------------------------------
 * Helper functions
 */

/*
 * NOTE: When adding new media bus codes, always remember to add
 * corresponding in-memory formats to the table below!!!
 *
 * If there are multiple entries with the same pixelformat but
 * different media bus codes, then keep those together. Otherwise
 * isp_video_enum_format() cannot detect duplicate pixelformats.
 */
static struct isp_format_info formats[] = {
        { MEDIA_BUS_FMT_Y8_1X8, MEDIA_BUS_FMT_Y8_1X8,
          MEDIA_BUS_FMT_Y8_1X8, MEDIA_BUS_FMT_Y8_1X8,
          V4L2_PIX_FMT_GREY, 8, 1, },
        { MEDIA_BUS_FMT_Y10_1X10, MEDIA_BUS_FMT_Y10_1X10,
          MEDIA_BUS_FMT_Y10_1X10, MEDIA_BUS_FMT_Y8_1X8,
          V4L2_PIX_FMT_Y10, 10, 2, },
        { MEDIA_BUS_FMT_Y12_1X12, MEDIA_BUS_FMT_Y10_1X10,
          MEDIA_BUS_FMT_Y12_1X12, MEDIA_BUS_FMT_Y8_1X8,
          V4L2_PIX_FMT_Y12, 12, 2, },
        { MEDIA_BUS_FMT_SBGGR8_1X8, MEDIA_BUS_FMT_SBGGR8_1X8,
          MEDIA_BUS_FMT_SBGGR8_1X8, MEDIA_BUS_FMT_SBGGR8_1X8,
          V4L2_PIX_FMT_SBGGR8, 8, 1, },
        { MEDIA_BUS_FMT_SGBRG8_1X8, MEDIA_BUS_FMT_SGBRG8_1X8,
          MEDIA_BUS_FMT_SGBRG8_1X8, MEDIA_BUS_FMT_SGBRG8_1X8,
          V4L2_PIX_FMT_SGBRG8, 8, 1, },
        { MEDIA_BUS_FMT_SGRBG8_1X8, MEDIA_BUS_FMT_SGRBG8_1X8,
          MEDIA_BUS_FMT_SGRBG8_1X8, MEDIA_BUS_FMT_SGRBG8_1X8,
          V4L2_PIX_FMT_SGRBG8, 8, 1, },
        { MEDIA_BUS_FMT_SRGGB8_1X8, MEDIA_BUS_FMT_SRGGB8_1X8,
          MEDIA_BUS_FMT_SRGGB8_1X8, MEDIA_BUS_FMT_SRGGB8_1X8,
          V4L2_PIX_FMT_SRGGB8, 8, 1, },
        { MEDIA_BUS_FMT_SBGGR10_DPCM8_1X8, MEDIA_BUS_FMT_SBGGR10_DPCM8_1X8,
          MEDIA_BUS_FMT_SBGGR10_1X10, 0,
          V4L2_PIX_FMT_SBGGR10DPCM8, 8, 1, },
        { MEDIA_BUS_FMT_SGBRG10_DPCM8_1X8, MEDIA_BUS_FMT_SGBRG10_DPCM8_1X8,
          MEDIA_BUS_FMT_SGBRG10_1X10, 0,
          V4L2_PIX_FMT_SGBRG10DPCM8, 8, 1, },
        { MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8, MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8,
          MEDIA_BUS_FMT_SGRBG10_1X10, 0,
          V4L2_PIX_FMT_SGRBG10DPCM8, 8, 1, },
        { MEDIA_BUS_FMT_SRGGB10_DPCM8_1X8, MEDIA_BUS_FMT_SRGGB10_DPCM8_1X8,
          MEDIA_BUS_FMT_SRGGB10_1X10, 0,
          V4L2_PIX_FMT_SRGGB10DPCM8, 8, 1, },
        { MEDIA_BUS_FMT_SBGGR10_1X10, MEDIA_BUS_FMT_SBGGR10_1X10,
          MEDIA_BUS_FMT_SBGGR10_1X10, MEDIA_BUS_FMT_SBGGR8_1X8,
          V4L2_PIX_FMT_SBGGR10, 10, 2, },
        { MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SGBRG10_1X10,
          MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SGBRG8_1X8,
          V4L2_PIX_FMT_SGBRG10, 10, 2, },
        { MEDIA_BUS_FMT_SGRBG10_1X10, MEDIA_BUS_FMT_SGRBG10_1X10,
          MEDIA_BUS_FMT_SGRBG10_1X10, MEDIA_BUS_FMT_SGRBG8_1X8,
          V4L2_PIX_FMT_SGRBG10, 10, 2, },
        { MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SRGGB10_1X10,
          MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SRGGB8_1X8,
          V4L2_PIX_FMT_SRGGB10, 10, 2, },
        { MEDIA_BUS_FMT_SBGGR12_1X12, MEDIA_BUS_FMT_SBGGR10_1X10,
          MEDIA_BUS_FMT_SBGGR12_1X12, MEDIA_BUS_FMT_SBGGR8_1X8,
          V4L2_PIX_FMT_SBGGR12, 12, 2, },
        { MEDIA_BUS_FMT_SGBRG12_1X12, MEDIA_BUS_FMT_SGBRG10_1X10,
          MEDIA_BUS_FMT_SGBRG12_1X12, MEDIA_BUS_FMT_SGBRG8_1X8,
          V4L2_PIX_FMT_SGBRG12, 12, 2, },
        { MEDIA_BUS_FMT_SGRBG12_1X12, MEDIA_BUS_FMT_SGRBG10_1X10,
          MEDIA_BUS_FMT_SGRBG12_1X12, MEDIA_BUS_FMT_SGRBG8_1X8,
          V4L2_PIX_FMT_SGRBG12, 12, 2, },
        { MEDIA_BUS_FMT_SRGGB12_1X12, MEDIA_BUS_FMT_SRGGB10_1X10,
          MEDIA_BUS_FMT_SRGGB12_1X12, MEDIA_BUS_FMT_SRGGB8_1X8,
          V4L2_PIX_FMT_SRGGB12, 12, 2, },
        { MEDIA_BUS_FMT_UYVY8_1X16, MEDIA_BUS_FMT_UYVY8_1X16,
          MEDIA_BUS_FMT_UYVY8_1X16, 0,
          V4L2_PIX_FMT_UYVY, 16, 2, },
        { MEDIA_BUS_FMT_UYVY8_2X8, MEDIA_BUS_FMT_UYVY8_2X8,
          MEDIA_BUS_FMT_UYVY8_2X8, 0,
          V4L2_PIX_FMT_UYVY, 8, 2, },
        { MEDIA_BUS_FMT_YUYV8_1X16, MEDIA_BUS_FMT_YUYV8_1X16,
          MEDIA_BUS_FMT_YUYV8_1X16, 0,
          V4L2_PIX_FMT_YUYV, 16, 2, },
        { MEDIA_BUS_FMT_YUYV8_2X8, MEDIA_BUS_FMT_YUYV8_2X8,
          MEDIA_BUS_FMT_YUYV8_2X8, 0,
          V4L2_PIX_FMT_YUYV, 8, 2, },
        /* Empty entry to catch the unsupported pixel code (0) used by the CCDC
         * module and avoid NULL pointer dereferences.
         */
        { 0, }
};

const struct isp_format_info *omap3isp_video_format_info(u32 code)
{
        unsigned int i;

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

        return NULL;
}

/*
 * isp_video_mbus_to_pix - Convert v4l2_mbus_framefmt to v4l2_pix_format
 * @video: ISP video instance
 * @mbus: v4l2_mbus_framefmt format (input)
 * @pix: v4l2_pix_format format (output)
 *
 * Fill the output pix structure with information from the input mbus format.
 * The bytesperline and sizeimage fields are computed from the requested bytes
 * per line value in the pix format and information from the video instance.
 *
 * Return the number of padding bytes at end of line.
 */
static unsigned int isp_video_mbus_to_pix(const struct isp_video *video,
                                          const struct v4l2_mbus_framefmt *mbus,
                                          struct v4l2_pix_format *pix)
{
        unsigned int bpl = pix->bytesperline;
        unsigned int min_bpl;
        unsigned int i;

        memset(pix, 0, sizeof(*pix));
        pix->width = mbus->width;
        pix->height = mbus->height;

        for (i = 0; i < ARRAY_SIZE(formats) - 1; ++i) {
                if (formats[i].code == mbus->code)
                        break;
        }

        if (WARN_ON(i == ARRAY_SIZE(formats) - 1))
                return 0;

        min_bpl = pix->width * formats[i].bpp;

        /* Clamp the requested bytes per line value. If the maximum bytes per
         * line value is zero, the module doesn't support user configurable line
         * sizes. Override the requested value with the minimum in that case.
         */
        if (video->bpl_max)
                bpl = clamp(bpl, min_bpl, video->bpl_max);
        else
                bpl = min_bpl;

        if (!video->bpl_zero_padding || bpl != min_bpl)
                bpl = ALIGN(bpl, video->bpl_alignment);

        pix->pixelformat = formats[i].pixelformat;
        pix->bytesperline = bpl;
        pix->sizeimage = pix->bytesperline * pix->height;
        pix->colorspace = mbus->colorspace;
        pix->field = mbus->field;

        return bpl - min_bpl;
}

static void isp_video_pix_to_mbus(const struct v4l2_pix_format *pix,
                                  struct v4l2_mbus_framefmt *mbus)
{
        unsigned int i;

        memset(mbus, 0, sizeof(*mbus));
        mbus->width = pix->width;
        mbus->height = pix->height;

        /* Skip the last format in the loop so that it will be selected if no
         * match is found.
         */
        for (i = 0; i < ARRAY_SIZE(formats) - 2; ++i) {
                if (formats[i].pixelformat == pix->pixelformat)
                        break;
        }

        mbus->code = formats[i].code;
        mbus->colorspace = pix->colorspace;
        mbus->field = pix->field;
}

static struct v4l2_subdev *
isp_video_remote_subdev(struct isp_video *video, u32 *pad)
{
        struct media_pad *remote;

        remote = media_pad_remote_pad_first(&video->pad);

        if (!remote || !is_media_entity_v4l2_subdev(remote->entity))
                return NULL;

        if (pad)
                *pad = remote->index;

        return media_entity_to_v4l2_subdev(remote->entity);
}

/* Return a pointer to the ISP video instance at the far end of the pipeline. */
static int isp_video_get_graph_data(struct isp_video *video,
                                    struct isp_pipeline *pipe)
{
        struct media_pipeline_entity_iter iter;
        struct media_entity *entity;
        struct isp_video *far_end = NULL;
        int ret;

        ret = media_pipeline_entity_iter_init(&pipe->pipe, &iter);
        if (ret)
                return ret;

        media_pipeline_for_each_entity(&pipe->pipe, &iter, entity) {
                struct isp_video *__video;

                media_entity_enum_set(&pipe->ent_enum, entity);

                if (far_end != NULL)
                        continue;

                if (entity == &video->video.entity)
                        continue;

                if (!is_media_entity_v4l2_video_device(entity))
                        continue;

                __video = to_isp_video(media_entity_to_video_device(entity));
                if (__video->type != video->type)
                        far_end = __video;
        }

        media_pipeline_entity_iter_cleanup(&iter);

        if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
                pipe->input = far_end;
                pipe->output = video;
        } else {
                if (far_end == NULL)
                        return -EPIPE;

                pipe->input = video;
                pipe->output = far_end;
        }

        return 0;
}

static int
__isp_video_get_format(struct isp_video *video, struct v4l2_format *format)
{
        struct v4l2_subdev_format fmt = {
                .which = V4L2_SUBDEV_FORMAT_ACTIVE,
        };
        struct v4l2_subdev *subdev;
        u32 pad;
        int ret;

        subdev = isp_video_remote_subdev(video, &pad);
        if (subdev == NULL)
                return -EINVAL;

        fmt.pad = pad;

        mutex_lock(&video->mutex);
        ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
        mutex_unlock(&video->mutex);

        if (ret)
                return ret;

        format->type = video->type;
        return isp_video_mbus_to_pix(video, &fmt.format, &format->fmt.pix);
}

static int
isp_video_check_format(struct isp_video *video, struct isp_video_fh *vfh)
{
        struct v4l2_format format;
        int ret;

        memcpy(&format, &vfh->format, sizeof(format));
        ret = __isp_video_get_format(video, &format);
        if (ret < 0)
                return ret;

        if (vfh->format.fmt.pix.pixelformat != format.fmt.pix.pixelformat ||
            vfh->format.fmt.pix.height != format.fmt.pix.height ||
            vfh->format.fmt.pix.width != format.fmt.pix.width ||
            vfh->format.fmt.pix.bytesperline != format.fmt.pix.bytesperline ||
            vfh->format.fmt.pix.sizeimage != format.fmt.pix.sizeimage ||
            vfh->format.fmt.pix.field != format.fmt.pix.field)
                return -EINVAL;

        return 0;
}

/* -----------------------------------------------------------------------------
 * Video queue operations
 */

static int isp_video_queue_setup(struct vb2_queue *queue,
                                 unsigned int *count, unsigned int *num_planes,
                                 unsigned int sizes[], struct device *alloc_devs[])
{
        struct isp_video_fh *vfh = vb2_get_drv_priv(queue);
        struct isp_video *video = vfh->video;

        if (*num_planes) {
                if (*num_planes != 1)
                        return -EINVAL;
                if (sizes[0] < vfh->format.fmt.pix.sizeimage)
                        return -EINVAL;
                return 0;
        }
        *num_planes = 1;

        sizes[0] = vfh->format.fmt.pix.sizeimage;
        if (sizes[0] == 0)
                return -EINVAL;

        *count = min(*count, video->capture_mem / PAGE_ALIGN(sizes[0]));

        return 0;
}

static int isp_video_buffer_prepare(struct vb2_buffer *buf)
{
        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(buf);
        struct isp_video_fh *vfh = vb2_get_drv_priv(buf->vb2_queue);
        unsigned int size = vfh->format.fmt.pix.sizeimage;
        struct isp_buffer *buffer = to_isp_buffer(vbuf);
        struct isp_video *video = vfh->video;
        dma_addr_t addr;

        /* Refuse to prepare the buffer is the video node has registered an
         * error. We don't need to take any lock here as the operation is
         * inherently racy. The authoritative check will be performed in the
         * queue handler, which can't return an error, this check is just a best
         * effort to notify userspace as early as possible.
         */
        if (unlikely(video->error))
                return -EIO;

        addr = vb2_dma_contig_plane_dma_addr(buf, 0);
        if (!IS_ALIGNED(addr, 32)) {
                dev_dbg(video->isp->dev,
                        "Buffer address must be aligned to 32 bytes boundary.\n");
                return -EINVAL;
        }

        if (vb2_plane_size(&buffer->vb.vb2_buf, 0) < size) {
                dev_dbg(video->isp->dev,
                        "data will not fit into plane (%lu < %u)\n",
                        vb2_plane_size(&buffer->vb.vb2_buf, 0), size);
                return -EINVAL;
        }
        vb2_set_plane_payload(&buffer->vb.vb2_buf, 0, size);
        buffer->dma = addr;

        return 0;
}

/*
 * isp_video_buffer_queue - Add buffer to streaming queue
 * @buf: Video buffer
 *
 * In memory-to-memory mode, start streaming on the pipeline if buffers are
 * queued on both the input and the output, if the pipeline isn't already busy.
 * If the pipeline is busy, it will be restarted in the output module interrupt
 * handler.
 */
static void isp_video_buffer_queue(struct vb2_buffer *buf)
{
        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(buf);
        struct isp_video_fh *vfh = vb2_get_drv_priv(buf->vb2_queue);
        struct isp_buffer *buffer = to_isp_buffer(vbuf);
        struct isp_video *video = vfh->video;
        struct isp_pipeline *pipe = to_isp_pipeline(&video->video.entity);
        enum isp_pipeline_state state;
        unsigned long flags;
        unsigned int empty;
        unsigned int start;

        spin_lock_irqsave(&video->irqlock, flags);

        if (unlikely(video->error)) {
                vb2_buffer_done(&buffer->vb.vb2_buf, VB2_BUF_STATE_ERROR);
                spin_unlock_irqrestore(&video->irqlock, flags);
                return;
        }

        empty = list_empty(&video->dmaqueue);
        list_add_tail(&buffer->irqlist, &video->dmaqueue);

        spin_unlock_irqrestore(&video->irqlock, flags);

        if (empty) {
                if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
                        state = ISP_PIPELINE_QUEUE_OUTPUT;
                else
                        state = ISP_PIPELINE_QUEUE_INPUT;

                spin_lock_irqsave(&pipe->lock, flags);
                pipe->state |= state;
                video->ops->queue(video, buffer);
                video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_QUEUED;

                start = isp_pipeline_ready(pipe);
                if (start)
                        pipe->state |= ISP_PIPELINE_STREAM;
                spin_unlock_irqrestore(&pipe->lock, flags);

                if (start)
                        omap3isp_pipeline_set_stream(pipe,
                                                ISP_PIPELINE_STREAM_SINGLESHOT);
        }
}

/*
 * omap3isp_video_return_buffers - Return all queued buffers to videobuf2
 * @video: ISP video object
 * @state: new state for the returned buffers
 *
 * Return all buffers queued on the video node to videobuf2 in the given state.
 * The buffer state should be VB2_BUF_STATE_QUEUED if called due to an error
 * when starting the stream, or VB2_BUF_STATE_ERROR otherwise.
 *
 * The function must be called with the video irqlock held.
 */
static void omap3isp_video_return_buffers(struct isp_video *video,
                                          enum vb2_buffer_state state)
{
        while (!list_empty(&video->dmaqueue)) {
                struct isp_buffer *buf;

                buf = list_first_entry(&video->dmaqueue,
                                       struct isp_buffer, irqlist);
                list_del(&buf->irqlist);
                vb2_buffer_done(&buf->vb.vb2_buf, state);
        }
}

static int isp_video_start_streaming(struct vb2_queue *queue,
                                     unsigned int count)
{
        struct isp_video_fh *vfh = vb2_get_drv_priv(queue);
        struct isp_video *video = vfh->video;
        struct isp_pipeline *pipe = to_isp_pipeline(&video->video.entity);
        unsigned long flags;
        int ret;

        /* In sensor-to-memory mode, the stream can be started synchronously
         * to the stream on command. In memory-to-memory mode, it will be
         * started when buffers are queued on both the input and output.
         */
        if (pipe->input)
                return 0;

        ret = omap3isp_pipeline_set_stream(pipe,
                                           ISP_PIPELINE_STREAM_CONTINUOUS);
        if (ret < 0) {
                spin_lock_irqsave(&video->irqlock, flags);
                omap3isp_video_return_buffers(video, VB2_BUF_STATE_QUEUED);
                spin_unlock_irqrestore(&video->irqlock, flags);
                return ret;
        }

        spin_lock_irqsave(&video->irqlock, flags);
        if (list_empty(&video->dmaqueue))
                video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_UNDERRUN;
        spin_unlock_irqrestore(&video->irqlock, flags);

        return 0;
}

static const struct vb2_ops isp_video_queue_ops = {
        .queue_setup = isp_video_queue_setup,
        .buf_prepare = isp_video_buffer_prepare,
        .buf_queue = isp_video_buffer_queue,
        .start_streaming = isp_video_start_streaming,
};

/*
 * omap3isp_video_buffer_next - Complete the current buffer and return the next
 * @video: ISP video object
 *
 * Remove the current video buffer from the DMA queue and fill its timestamp and
 * field count before handing it back to videobuf2.
 *
 * For capture video nodes the buffer state is set to VB2_BUF_STATE_DONE if no
 * error has been flagged in the pipeline, or to VB2_BUF_STATE_ERROR otherwise.
 * For video output nodes the buffer state is always set to VB2_BUF_STATE_DONE.
 *
 * The DMA queue is expected to contain at least one buffer.
 *
 * Return a pointer to the next buffer in the DMA queue, or NULL if the queue is
 * empty.
 */
struct isp_buffer *omap3isp_video_buffer_next(struct isp_video *video)
{
        struct isp_pipeline *pipe = to_isp_pipeline(&video->video.entity);
        enum vb2_buffer_state vb_state;
        struct isp_buffer *buf;
        unsigned long flags;

        spin_lock_irqsave(&video->irqlock, flags);
        if (WARN_ON(list_empty(&video->dmaqueue))) {
                spin_unlock_irqrestore(&video->irqlock, flags);
                return NULL;
        }

        buf = list_first_entry(&video->dmaqueue, struct isp_buffer,
                               irqlist);
        list_del(&buf->irqlist);
        spin_unlock_irqrestore(&video->irqlock, flags);

        buf->vb.vb2_buf.timestamp = ktime_get_ns();

        /* Do frame number propagation only if this is the output video node.
         * Frame number either comes from the CSI receivers or it gets
         * incremented here if H3A is not active.
         * Note: There is no guarantee that the output buffer will finish
         * first, so the input number might lag behind by 1 in some cases.
         */
        if (video == pipe->output && !pipe->do_propagation)
                buf->vb.sequence =
                        atomic_inc_return(&pipe->frame_number);
        else
                buf->vb.sequence = atomic_read(&pipe->frame_number);

        if (pipe->field != V4L2_FIELD_NONE)
                buf->vb.sequence /= 2;

        buf->vb.field = pipe->field;

        /* Report pipeline errors to userspace on the capture device side. */
        if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && pipe->error) {
                vb_state = VB2_BUF_STATE_ERROR;
                pipe->error = false;
        } else {
                vb_state = VB2_BUF_STATE_DONE;
        }

        vb2_buffer_done(&buf->vb.vb2_buf, vb_state);

        spin_lock_irqsave(&video->irqlock, flags);

        if (list_empty(&video->dmaqueue)) {
                enum isp_pipeline_state state;

                spin_unlock_irqrestore(&video->irqlock, flags);

                if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
                        state = ISP_PIPELINE_QUEUE_OUTPUT
                              | ISP_PIPELINE_STREAM;
                else
                        state = ISP_PIPELINE_QUEUE_INPUT
                              | ISP_PIPELINE_STREAM;

                spin_lock_irqsave(&pipe->lock, flags);
                pipe->state &= ~state;
                if (video->pipe.stream_state == ISP_PIPELINE_STREAM_CONTINUOUS)
                        video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_UNDERRUN;
                spin_unlock_irqrestore(&pipe->lock, flags);
                return NULL;
        }

        if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && pipe->input != NULL) {
                spin_lock(&pipe->lock);
                pipe->state &= ~ISP_PIPELINE_STREAM;
                spin_unlock(&pipe->lock);
        }

        buf = list_first_entry(&video->dmaqueue, struct isp_buffer,
                               irqlist);

        spin_unlock_irqrestore(&video->irqlock, flags);

        return buf;
}

/*
 * omap3isp_video_cancel_stream - Cancel stream on a video node
 * @video: ISP video object
 *
 * Cancelling a stream returns all buffers queued on the video node to videobuf2
 * in the erroneous state and makes sure no new buffer can be queued.
 */
void omap3isp_video_cancel_stream(struct isp_video *video)
{
        unsigned long flags;

        spin_lock_irqsave(&video->irqlock, flags);
        omap3isp_video_return_buffers(video, VB2_BUF_STATE_ERROR);
        video->error = true;
        spin_unlock_irqrestore(&video->irqlock, flags);
}

/*
 * omap3isp_video_resume - Perform resume operation on the buffers
 * @video: ISP video object
 * @continuous: Pipeline is in single shot mode if 0 or continuous mode otherwise
 *
 * This function is intended to be used on suspend/resume scenario. It
 * requests video queue layer to discard buffers marked as DONE if it's in
 * continuous mode and requests ISP modules to queue again the ACTIVE buffer
 * if there's any.
 */
void omap3isp_video_resume(struct isp_video *video, int continuous)
{
        struct isp_buffer *buf = NULL;

        if (continuous && video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
                mutex_lock(&video->queue_lock);
                vb2_discard_done(video->queue);
                mutex_unlock(&video->queue_lock);
        }

        if (!list_empty(&video->dmaqueue)) {
                buf = list_first_entry(&video->dmaqueue,
                                       struct isp_buffer, irqlist);
                video->ops->queue(video, buf);
                video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_QUEUED;
        } else {
                if (continuous)
                        video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_UNDERRUN;
        }
}

/* -----------------------------------------------------------------------------
 * V4L2 ioctls
 */

static int
isp_video_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
{
        struct isp_video *video = video_drvdata(file);

        strscpy(cap->driver, ISP_VIDEO_DRIVER_NAME, sizeof(cap->driver));
        strscpy(cap->card, video->video.name, sizeof(cap->card));

        cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT
                | V4L2_CAP_STREAMING | V4L2_CAP_DEVICE_CAPS | V4L2_CAP_IO_MC;

        return 0;
}

static int
isp_video_enum_format(struct file *file, void *fh, struct v4l2_fmtdesc *f)
{
        struct isp_video *video = video_drvdata(file);
        unsigned int i, j;

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

        for (i = 0, j = 0; i < ARRAY_SIZE(formats); i++) {
                /* Weed out duplicate pixelformats with different mbus codes */
                if (!f->mbus_code && i &&
                    formats[i - 1].pixelformat == formats[i].pixelformat)
                        continue;
                if (f->mbus_code && formats[i].code != f->mbus_code)
                        continue;

                if (j == f->index) {
                        f->pixelformat = formats[i].pixelformat;
                        return 0;
                }
                j++;
        }

        return -EINVAL;
}

static int
isp_video_get_format(struct file *file, void *fh, struct v4l2_format *format)
{
        struct isp_video_fh *vfh = file_to_isp_video_fh(file);
        struct isp_video *video = video_drvdata(file);

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

        mutex_lock(&video->mutex);
        *format = vfh->format;
        mutex_unlock(&video->mutex);

        return 0;
}

static int
isp_video_try_format(struct file *file, void *fh, struct v4l2_format *format)
{
        struct isp_video *video = video_drvdata(file);
        struct v4l2_subdev_format fmt = {
                .which = V4L2_SUBDEV_FORMAT_ACTIVE,
        };
        struct v4l2_subdev *subdev;
        u32 pad;
        int ret;

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

        /* Replace unsupported field orders with sane defaults. */
        switch (format->fmt.pix.field) {
        case V4L2_FIELD_NONE:
                /* Progressive is supported everywhere. */
                break;
        case V4L2_FIELD_ALTERNATE:
                /* ALTERNATE is not supported on output nodes. */
                if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
                        format->fmt.pix.field = V4L2_FIELD_NONE;
                break;
        case V4L2_FIELD_INTERLACED:
                /* The ISP has no concept of video standard, select the
                 * top-bottom order when the unqualified interlaced order is
                 * requested.
                 */
                format->fmt.pix.field = V4L2_FIELD_INTERLACED_TB;
                fallthrough;
        case V4L2_FIELD_INTERLACED_TB:
        case V4L2_FIELD_INTERLACED_BT:
                /* Interlaced orders are only supported at the CCDC output. */
                if (video != &video->isp->isp_ccdc.video_out)
                        format->fmt.pix.field = V4L2_FIELD_NONE;
                break;
        case V4L2_FIELD_TOP:
        case V4L2_FIELD_BOTTOM:
        case V4L2_FIELD_SEQ_TB:
        case V4L2_FIELD_SEQ_BT:
        default:
                /* All other field orders are currently unsupported, default to
                 * progressive.
                 */
                format->fmt.pix.field = V4L2_FIELD_NONE;
                break;
        }

        if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) {
                isp_video_pix_to_mbus(&format->fmt.pix, &fmt.format);
                isp_video_mbus_to_pix(video, &fmt.format, &format->fmt.pix);
                return 0;
        }

        subdev = isp_video_remote_subdev(video, &pad);
        if (subdev == NULL)
                return -EINVAL;

        isp_video_pix_to_mbus(&format->fmt.pix, &fmt.format);

        fmt.pad = pad;
        ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
        if (ret)
                return ret == -ENOIOCTLCMD ? -ENOTTY : ret;

        isp_video_mbus_to_pix(video, &fmt.format, &format->fmt.pix);
        return 0;
}

static int
isp_video_set_format(struct file *file, void *fh, struct v4l2_format *format)
{
        struct isp_video_fh *vfh = file_to_isp_video_fh(file);
        struct isp_video *video = video_drvdata(file);
        int ret;

        ret = isp_video_try_format(file, fh, format);
        if (ret)
                return ret;

        mutex_lock(&video->mutex);
        vfh->format = *format;
        mutex_unlock(&video->mutex);

        return 0;
}

static int
isp_video_get_selection(struct file *file, void *fh, struct v4l2_selection *sel)
{
        struct isp_video *video = video_drvdata(file);
        struct v4l2_subdev_format format = {
                .which = V4L2_SUBDEV_FORMAT_ACTIVE,
        };
        struct v4l2_subdev *subdev;
        struct v4l2_subdev_selection sdsel = {
                .which = V4L2_SUBDEV_FORMAT_ACTIVE,
                .target = sel->target,
        };
        u32 pad;
        int ret;

        switch (sel->target) {
        case V4L2_SEL_TGT_CROP:
        case V4L2_SEL_TGT_CROP_BOUNDS:
        case V4L2_SEL_TGT_CROP_DEFAULT:
                if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
                        return -EINVAL;
                break;
        case V4L2_SEL_TGT_COMPOSE:
        case V4L2_SEL_TGT_COMPOSE_BOUNDS:
        case V4L2_SEL_TGT_COMPOSE_DEFAULT:
                if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
                        return -EINVAL;
                break;
        default:
                return -EINVAL;
        }
        subdev = isp_video_remote_subdev(video, &pad);
        if (subdev == NULL)
                return -EINVAL;

        /* Try the get selection operation first and fallback to get format if not
         * implemented.
         */
        sdsel.pad = pad;
        ret = v4l2_subdev_call(subdev, pad, get_selection, NULL, &sdsel);
        if (!ret)
                sel->r = sdsel.r;
        if (ret != -ENOIOCTLCMD)
                return ret;

        format.pad = pad;
        ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &format);
        if (ret < 0)
                return ret == -ENOIOCTLCMD ? -ENOTTY : ret;

        sel->r.left = 0;
        sel->r.top = 0;
        sel->r.width = format.format.width;
        sel->r.height = format.format.height;

        return 0;
}

static int
isp_video_set_selection(struct file *file, void *fh, struct v4l2_selection *sel)
{
        struct isp_video *video = video_drvdata(file);
        struct v4l2_subdev *subdev;
        struct v4l2_subdev_selection sdsel = {
                .which = V4L2_SUBDEV_FORMAT_ACTIVE,
                .target = sel->target,
                .flags = sel->flags,
                .r = sel->r,
        };
        u32 pad;
        int ret;

        switch (sel->target) {
        case V4L2_SEL_TGT_CROP:
                if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
                        return -EINVAL;
                break;
        case V4L2_SEL_TGT_COMPOSE:
                if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
                        return -EINVAL;
                break;
        default:
                return -EINVAL;
        }
        subdev = isp_video_remote_subdev(video, &pad);
        if (subdev == NULL)
                return -EINVAL;

        sdsel.pad = pad;
        mutex_lock(&video->mutex);
        ret = v4l2_subdev_call(subdev, pad, set_selection, NULL, &sdsel);
        mutex_unlock(&video->mutex);
        if (!ret)
                sel->r = sdsel.r;

        return ret == -ENOIOCTLCMD ? -ENOTTY : ret;
}

static int
isp_video_get_param(struct file *file, void *fh, struct v4l2_streamparm *a)
{
        struct isp_video_fh *vfh = file_to_isp_video_fh(file);
        struct isp_video *video = video_drvdata(file);

        if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
            video->type != a->type)
                return -EINVAL;

        memset(a, 0, sizeof(*a));
        a->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
        a->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
        a->parm.output.timeperframe = vfh->timeperframe;

        return 0;
}

static int
isp_video_set_param(struct file *file, void *fh, struct v4l2_streamparm *a)
{
        struct isp_video_fh *vfh = file_to_isp_video_fh(file);
        struct isp_video *video = video_drvdata(file);

        if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
            video->type != a->type)
                return -EINVAL;

        if (a->parm.output.timeperframe.denominator == 0)
                a->parm.output.timeperframe.denominator = 1;
        if (a->parm.output.timeperframe.numerator == 0)
                a->parm.output.timeperframe.numerator = 1;

        a->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
        vfh->timeperframe = a->parm.output.timeperframe;

        return 0;
}

static int
isp_video_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *rb)
{
        struct isp_video_fh *vfh = file_to_isp_video_fh(file);
        struct isp_video *video = video_drvdata(file);
        int ret;

        mutex_lock(&video->queue_lock);
        ret = vb2_reqbufs(&vfh->queue, rb);
        mutex_unlock(&video->queue_lock);

        return ret;
}

static int
isp_video_create_bufs(struct file *file, void *fh, struct v4l2_create_buffers *p)
{
        struct isp_video_fh *vfh = file_to_isp_video_fh(file);
        struct isp_video *video = video_drvdata(file);
        int ret;

        mutex_lock(&video->queue_lock);
        ret = vb2_create_bufs(&vfh->queue, p);
        mutex_unlock(&video->queue_lock);

        return ret;
}

static int
isp_video_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
{
        struct isp_video_fh *vfh = file_to_isp_video_fh(file);
        struct isp_video *video = video_drvdata(file);
        int ret;

        mutex_lock(&video->queue_lock);
        ret = vb2_querybuf(&vfh->queue, b);
        mutex_unlock(&video->queue_lock);

        return ret;
}

static int
isp_video_prepare_buf(struct file *file, void *fh, struct v4l2_buffer *b)
{
        struct isp_video_fh *vfh = file_to_isp_video_fh(file);
        struct isp_video *video = video_drvdata(file);
        int ret;

        mutex_lock(&video->queue_lock);
        ret = vb2_prepare_buf(&vfh->queue, video->video.v4l2_dev->mdev, b);
        mutex_unlock(&video->queue_lock);

        return ret;
}

static int
isp_video_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
{
        struct isp_video_fh *vfh = file_to_isp_video_fh(file);
        struct isp_video *video = video_drvdata(file);
        int ret;

        mutex_lock(&video->queue_lock);
        ret = vb2_qbuf(&vfh->queue, video->video.v4l2_dev->mdev, b);
        mutex_unlock(&video->queue_lock);

        return ret;
}

static int
isp_video_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
{
        struct isp_video_fh *vfh = file_to_isp_video_fh(file);
        struct isp_video *video = video_drvdata(file);
        int ret;

        mutex_lock(&video->queue_lock);
        ret = vb2_dqbuf(&vfh->queue, b, file->f_flags & O_NONBLOCK);
        mutex_unlock(&video->queue_lock);

        return ret;
}

static int isp_video_check_external_subdevs(struct isp_video *video,
                                            struct isp_pipeline *pipe)
{
        struct isp_device *isp = video->isp;
        struct media_entity *ents[] = {
                &isp->isp_csi2a.subdev.entity,
                &isp->isp_csi2c.subdev.entity,
                &isp->isp_ccp2.subdev.entity,
                &isp->isp_ccdc.subdev.entity
        };
        struct media_pad *source_pad;
        struct media_entity *source = NULL;
        struct media_entity *sink;
        struct v4l2_subdev_format fmt = {
                .which = V4L2_SUBDEV_FORMAT_ACTIVE,
        };
        struct v4l2_ext_controls ctrls;
        struct v4l2_ext_control ctrl;
        unsigned int i;
        int ret;

        /* Memory-to-memory pipelines have no external subdev. */
        if (pipe->input != NULL)
                return 0;

        for (i = 0; i < ARRAY_SIZE(ents); i++) {
                /* Is the entity part of the pipeline? */
                if (!media_entity_enum_test(&pipe->ent_enum, ents[i]))
                        continue;

                /* ISP entities have always sink pad == 0. Find source. */
                source_pad = media_pad_remote_pad_first(&ents[i]->pads[0]);
                if (source_pad == NULL)
                        continue;

                source = source_pad->entity;
                sink = ents[i];
                break;
        }

        if (!source) {
                dev_warn(isp->dev, "can't find source, failing now\n");
                return -EINVAL;
        }

        if (!is_media_entity_v4l2_subdev(source))
                return 0;

        pipe->external = media_entity_to_v4l2_subdev(source);

        fmt.pad = source_pad->index;
        ret = v4l2_subdev_call(media_entity_to_v4l2_subdev(sink),
                               pad, get_fmt, NULL, &fmt);
        if (unlikely(ret < 0)) {
                dev_warn(isp->dev, "get_fmt returned null!\n");
                return ret;
        }

        pipe->external_width =
                omap3isp_video_format_info(fmt.format.code)->width;

        memset(&ctrls, 0, sizeof(ctrls));
        memset(&ctrl, 0, sizeof(ctrl));

        ctrl.id = V4L2_CID_PIXEL_RATE;

        ctrls.count = 1;
        ctrls.controls = &ctrl;
        ret = v4l2_g_ext_ctrls(pipe->external->ctrl_handler, &video->video,
                               NULL, &ctrls);
        if (ret < 0) {
                dev_warn(isp->dev, "no pixel rate control in subdev %s\n",
                         pipe->external->name);
                return ret;
        }

        pipe->external_rate = ctrl.value64;

        if (media_entity_enum_test(&pipe->ent_enum,
                                   &isp->isp_ccdc.subdev.entity)) {
                unsigned int rate = UINT_MAX;
                /*
                 * Check that maximum allowed CCDC pixel rate isn't
                 * exceeded by the pixel rate.
                 */
                omap3isp_ccdc_max_rate(&isp->isp_ccdc, &rate);
                if (pipe->external_rate > rate)
                        return -ENOSPC;
        }

        return 0;
}

/*
 * Stream management
 *
 * Every ISP pipeline has a single input and a single output. The input can be
 * either a sensor or a video node. The output is always a video node.
 *
 * As every pipeline has an output video node, the ISP video objects at the
 * pipeline output stores the pipeline state. It tracks the streaming state of
 * both the input and output, as well as the availability of buffers.
 *
 * In sensor-to-memory mode, frames are always available at the pipeline input.
 * Starting the sensor usually requires I2C transfers and must be done in
 * interruptible context. The pipeline is started and stopped synchronously
 * to the stream on/off commands. All modules in the pipeline will get their
 * subdev set stream handler called. The module at the end of the pipeline must
 * delay starting the hardware until buffers are available at its output.
 *
 * In memory-to-memory mode, starting/stopping the stream requires
 * synchronization between the input and output. ISP modules can't be stopped
 * in the middle of a frame, and at least some of the modules seem to become
 * busy as soon as they're started, even if they don't receive a frame start
 * event. For that reason frames need to be processed in single-shot mode. The
 * driver needs to wait until a frame is completely processed and written to
 * memory before restarting the pipeline for the next frame. Pipelined
 * processing might be possible but requires more testing.
 *
 * Stream start must be delayed until buffers are available at both the input
 * and output. The pipeline must be started in the vb2 queue callback with
 * the buffers queue spinlock held. The modules subdev set stream operation must
 * not sleep.
 */
static int
isp_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
{
        struct isp_video_fh *vfh = file_to_isp_video_fh(file);
        struct isp_video *video = video_drvdata(file);
        enum isp_pipeline_state state;
        struct isp_pipeline *pipe;
        unsigned long flags;
        int ret;

        if (type != video->type)
                return -EINVAL;

        mutex_lock(&video->stream_lock);

        /* Start streaming on the pipeline. No link touching an entity in the
         * pipeline can be activated or deactivated once streaming is started.
         */
        pipe = to_isp_pipeline(&video->video.entity) ? : &video->pipe;

        ret = media_entity_enum_init(&pipe->ent_enum, &video->isp->media_dev);
        if (ret)
                goto err_enum_init;

        /* TODO: Implement PM QoS */
        pipe->l3_ick = clk_get_rate(video->isp->clock[ISP_CLK_L3_ICK]);
        pipe->max_rate = pipe->l3_ick;

        ret = video_device_pipeline_start(&video->video, &pipe->pipe);
        if (ret < 0)
                goto err_pipeline_start;

        /* Verify that the currently configured format matches the output of
         * the connected subdev.
         */
        ret = isp_video_check_format(video, vfh);
        if (ret < 0)
                goto err_check_format;

        video->bpl_padding = ret;
        video->bpl_value = vfh->format.fmt.pix.bytesperline;

        ret = isp_video_get_graph_data(video, pipe);
        if (ret < 0)
                goto err_check_format;

        if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
                state = ISP_PIPELINE_STREAM_OUTPUT | ISP_PIPELINE_IDLE_OUTPUT;
        else
                state = ISP_PIPELINE_STREAM_INPUT | ISP_PIPELINE_IDLE_INPUT;

        ret = isp_video_check_external_subdevs(video, pipe);
        if (ret < 0)
                goto err_check_format;

        pipe->error = false;

        spin_lock_irqsave(&pipe->lock, flags);
        pipe->state &= ~ISP_PIPELINE_STREAM;
        pipe->state |= state;
        spin_unlock_irqrestore(&pipe->lock, flags);

        /* Set the maximum time per frame as the value requested by userspace.
         * This is a soft limit that can be overridden if the hardware doesn't
         * support the request limit.
         */
        if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
                pipe->max_timeperframe = vfh->timeperframe;

        video->queue = &vfh->queue;
        INIT_LIST_HEAD(&video->dmaqueue);
        atomic_set(&pipe->frame_number, -1);
        pipe->field = vfh->format.fmt.pix.field;

        mutex_lock(&video->queue_lock);
        ret = vb2_streamon(&vfh->queue, type);
        mutex_unlock(&video->queue_lock);
        if (ret < 0)
                goto err_check_format;

        mutex_unlock(&video->stream_lock);

        return 0;

err_check_format:
        video_device_pipeline_stop(&video->video);
err_pipeline_start:
        /* TODO: Implement PM QoS */
        /* The DMA queue must be emptied here, otherwise CCDC interrupts that
         * will get triggered the next time the CCDC is powered up will try to
         * access buffers that might have been freed but still present in the
         * DMA queue. This can easily get triggered if the above
         * omap3isp_pipeline_set_stream() call fails on a system with a
         * free-running sensor.
         */
        INIT_LIST_HEAD(&video->dmaqueue);
        video->queue = NULL;

        media_entity_enum_cleanup(&pipe->ent_enum);

err_enum_init:
        mutex_unlock(&video->stream_lock);

        return ret;
}

static int
isp_video_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
{
        struct isp_video_fh *vfh = file_to_isp_video_fh(file);
        struct isp_video *video = video_drvdata(file);
        struct isp_pipeline *pipe = to_isp_pipeline(&video->video.entity);
        enum isp_pipeline_state state;
        unsigned int streaming;
        unsigned long flags;

        if (type != video->type)
                return -EINVAL;

        mutex_lock(&video->stream_lock);

        /* Make sure we're not streaming yet. */
        mutex_lock(&video->queue_lock);
        streaming = vb2_is_streaming(&vfh->queue);
        mutex_unlock(&video->queue_lock);

        if (!streaming)
                goto done;

        /* Update the pipeline state. */
        if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
                state = ISP_PIPELINE_STREAM_OUTPUT
                      | ISP_PIPELINE_QUEUE_OUTPUT;
        else
                state = ISP_PIPELINE_STREAM_INPUT
                      | ISP_PIPELINE_QUEUE_INPUT;

        spin_lock_irqsave(&pipe->lock, flags);
        pipe->state &= ~state;
        spin_unlock_irqrestore(&pipe->lock, flags);

        /* Stop the stream. */
        omap3isp_pipeline_set_stream(pipe, ISP_PIPELINE_STREAM_STOPPED);
        omap3isp_video_cancel_stream(video);

        mutex_lock(&video->queue_lock);
        vb2_streamoff(&vfh->queue, type);
        mutex_unlock(&video->queue_lock);
        video->queue = NULL;
        video->error = false;

        /* TODO: Implement PM QoS */
        video_device_pipeline_stop(&video->video);

        media_entity_enum_cleanup(&pipe->ent_enum);

done:
        mutex_unlock(&video->stream_lock);
        return 0;
}

static int
isp_video_enum_input(struct file *file, void *fh, struct v4l2_input *input)
{
        if (input->index > 0)
                return -EINVAL;

        strscpy(input->name, "camera", sizeof(input->name));
        input->type = V4L2_INPUT_TYPE_CAMERA;

        return 0;
}

static int
isp_video_g_input(struct file *file, void *fh, unsigned int *input)
{
        *input = 0;

        return 0;
}

static int
isp_video_s_input(struct file *file, void *fh, unsigned int input)
{
        return input == 0 ? 0 : -EINVAL;
}

static const struct v4l2_ioctl_ops isp_video_ioctl_ops = {
        .vidioc_querycap                = isp_video_querycap,
        .vidioc_enum_fmt_vid_cap        = isp_video_enum_format,
        .vidioc_g_fmt_vid_cap           = isp_video_get_format,
        .vidioc_s_fmt_vid_cap           = isp_video_set_format,
        .vidioc_try_fmt_vid_cap         = isp_video_try_format,
        .vidioc_enum_fmt_vid_out        = isp_video_enum_format,
        .vidioc_g_fmt_vid_out           = isp_video_get_format,
        .vidioc_s_fmt_vid_out           = isp_video_set_format,
        .vidioc_try_fmt_vid_out         = isp_video_try_format,
        .vidioc_g_selection             = isp_video_get_selection,
        .vidioc_s_selection             = isp_video_set_selection,
        .vidioc_g_parm                  = isp_video_get_param,
        .vidioc_s_parm                  = isp_video_set_param,
        .vidioc_reqbufs                 = isp_video_reqbufs,
        .vidioc_create_bufs             = isp_video_create_bufs,
        .vidioc_querybuf                = isp_video_querybuf,
        .vidioc_prepare_buf             = isp_video_prepare_buf,
        .vidioc_qbuf                    = isp_video_qbuf,
        .vidioc_dqbuf                   = isp_video_dqbuf,
        .vidioc_streamon                = isp_video_streamon,
        .vidioc_streamoff               = isp_video_streamoff,
        .vidioc_enum_input              = isp_video_enum_input,
        .vidioc_g_input                 = isp_video_g_input,
        .vidioc_s_input                 = isp_video_s_input,
};

/* -----------------------------------------------------------------------------
 * V4L2 file operations
 */

static int isp_video_open(struct file *file)
{
        struct isp_video *video = video_drvdata(file);
        struct v4l2_mbus_framefmt fmt;
        struct isp_video_fh *handle;
        struct vb2_queue *queue;
        int ret = 0;

        handle = kzalloc_obj(*handle);
        if (handle == NULL)
                return -ENOMEM;

        v4l2_fh_init(&handle->vfh, &video->video);
        v4l2_fh_add(&handle->vfh, file);

        /* If this is the first user, initialise the pipeline. */
        if (omap3isp_get(video->isp) == NULL) {
                ret = -EBUSY;
                goto done;
        }

        ret = v4l2_pipeline_pm_get(&video->video.entity);
        if (ret < 0) {
                omap3isp_put(video->isp);
                goto done;
        }

        queue = &handle->queue;
        queue->type = video->type;
        queue->io_modes = VB2_MMAP | VB2_USERPTR;
        queue->drv_priv = handle;
        queue->ops = &isp_video_queue_ops;
        queue->mem_ops = &vb2_dma_contig_memops;
        queue->buf_struct_size = sizeof(struct isp_buffer);
        queue->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
        queue->dev = video->isp->dev;
        queue->lock = &video->queue_lock;

        ret = vb2_queue_init(&handle->queue);
        if (ret < 0) {
                omap3isp_put(video->isp);
                goto done;
        }

        memset(&handle->format, 0, sizeof(handle->format));
        handle->format.type = video->type;
        handle->format.fmt.pix.width = 720;
        handle->format.fmt.pix.height = 480;
        handle->format.fmt.pix.pixelformat = V4L2_PIX_FMT_UYVY;
        handle->format.fmt.pix.field = V4L2_FIELD_NONE;
        handle->format.fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
        isp_video_pix_to_mbus(&handle->format.fmt.pix, &fmt);
        isp_video_mbus_to_pix(video, &fmt, &handle->format.fmt.pix);
        handle->timeperframe.numerator = 1;
        handle->timeperframe.denominator = 1;

        handle->video = video;

done:
        if (ret < 0) {
                v4l2_fh_del(&handle->vfh, file);
                v4l2_fh_exit(&handle->vfh);
                kfree(handle);
        }

        return ret;
}

static int isp_video_release(struct file *file)
{
        struct isp_video *video = video_drvdata(file);
        struct v4l2_fh *vfh = file_to_v4l2_fh(file);
        struct isp_video_fh *handle = file_to_isp_video_fh(file);

        /* Disable streaming and free the buffers queue resources. */
        isp_video_streamoff(file, vfh, video->type);

        mutex_lock(&video->queue_lock);
        vb2_queue_release(&handle->queue);
        mutex_unlock(&video->queue_lock);

        v4l2_pipeline_pm_put(&video->video.entity);

        /* Release the file handle. */
        v4l2_fh_del(vfh, file);
        v4l2_fh_exit(vfh);
        kfree(handle);

        omap3isp_put(video->isp);

        return 0;
}

static __poll_t isp_video_poll(struct file *file, poll_table *wait)
{
        struct isp_video_fh *vfh = file_to_isp_video_fh(file);
        struct isp_video *video = video_drvdata(file);
        __poll_t ret;

        mutex_lock(&video->queue_lock);
        ret = vb2_poll(&vfh->queue, file, wait);
        mutex_unlock(&video->queue_lock);

        return ret;
}

static int isp_video_mmap(struct file *file, struct vm_area_struct *vma)
{
        struct isp_video_fh *vfh = file_to_isp_video_fh(file);

        return vb2_mmap(&vfh->queue, vma);
}

static const struct v4l2_file_operations isp_video_fops = {
        .owner = THIS_MODULE,
        .unlocked_ioctl = video_ioctl2,
        .open = isp_video_open,
        .release = isp_video_release,
        .poll = isp_video_poll,
        .mmap = isp_video_mmap,
};

/* -----------------------------------------------------------------------------
 * ISP video core
 */

static const struct isp_video_operations isp_video_dummy_ops = {
};

int omap3isp_video_init(struct isp_video *video, const char *name)
{
        const char *direction;
        int ret;

        switch (video->type) {
        case V4L2_BUF_TYPE_VIDEO_CAPTURE:
                direction = "output";
                video->pad.flags = MEDIA_PAD_FL_SINK
                                   | MEDIA_PAD_FL_MUST_CONNECT;
                break;
        case V4L2_BUF_TYPE_VIDEO_OUTPUT:
                direction = "input";
                video->pad.flags = MEDIA_PAD_FL_SOURCE
                                   | MEDIA_PAD_FL_MUST_CONNECT;
                video->video.vfl_dir = VFL_DIR_TX;
                break;

        default:
                return -EINVAL;
        }

        ret = media_entity_pads_init(&video->video.entity, 1, &video->pad);
        if (ret < 0)
                return ret;

        mutex_init(&video->mutex);
        atomic_set(&video->active, 0);

        spin_lock_init(&video->pipe.lock);
        mutex_init(&video->stream_lock);
        mutex_init(&video->queue_lock);
        spin_lock_init(&video->irqlock);

        /* Initialize the video device. */
        if (video->ops == NULL)
                video->ops = &isp_video_dummy_ops;

        video->video.fops = &isp_video_fops;
        snprintf(video->video.name, sizeof(video->video.name),
                 "OMAP3 ISP %s %s", name, direction);
        video->video.vfl_type = VFL_TYPE_VIDEO;
        video->video.release = video_device_release_empty;
        video->video.ioctl_ops = &isp_video_ioctl_ops;
        if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
                video->video.device_caps = V4L2_CAP_VIDEO_CAPTURE
                                         | V4L2_CAP_STREAMING | V4L2_CAP_IO_MC;
                v4l2_disable_ioctl(&video->video, VIDIOC_S_PARM);
                v4l2_disable_ioctl(&video->video, VIDIOC_G_PARM);
        } else {
                video->video.device_caps = V4L2_CAP_VIDEO_OUTPUT
                                         | V4L2_CAP_STREAMING | V4L2_CAP_IO_MC;
        }

        video->pipe.stream_state = ISP_PIPELINE_STREAM_STOPPED;

        video_set_drvdata(&video->video, video);

        return 0;
}

void omap3isp_video_cleanup(struct isp_video *video)
{
        media_entity_cleanup(&video->video.entity);
        mutex_destroy(&video->queue_lock);
        mutex_destroy(&video->stream_lock);
        mutex_destroy(&video->mutex);
}

int omap3isp_video_register(struct isp_video *video, struct v4l2_device *vdev)
{
        int ret;

        video->video.v4l2_dev = vdev;

        ret = video_register_device(&video->video, VFL_TYPE_VIDEO, -1);
        if (ret < 0)
                dev_err(video->isp->dev,
                        "%s: could not register video device (%d)\n",
                        __func__, ret);

        return ret;
}

void omap3isp_video_unregister(struct isp_video *video)
{
        video_unregister_device(&video->video);
}