[media] v4l: omap4iss: Add support for OMAP4 camera interface - Video devices

This adds a very simplistic driver to utilize the CSI2A interface inside
the ISS subsystem in OMAP4, and dump the data to memory.
Check Documentation/video4linux/omap4_camera.txt for details.
This commit adds video devices support.
Signed-off-by: Sergio Aguirre <sergio.a.aguirre@gmail.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/staging/media/omap4iss/iss_video.c

+/*
+ * TI OMAP4 ISS V4L2 Driver - Generic video node
+ *
+ * Copyright (C) 2012 Texas Instruments, Inc.
+ *
+ * Author: Sergio Aguirre <sergio.a.aguirre@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <asm/cacheflush.h>
+#include <linux/clk.h>
+#include <linux/mm.h>
+#include <linux/pagemap.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <media/v4l2-dev.h>
+#include <media/v4l2-ioctl.h>
+
+#include "iss_video.h"
+#include "iss.h"
+
+
+/* -----------------------------------------------------------------------------
+ * Helper functions
+ */
+
+static struct iss_format_info formats[] = {
+	{ V4L2_MBUS_FMT_Y8_1X8, V4L2_MBUS_FMT_Y8_1X8,
+	  V4L2_MBUS_FMT_Y8_1X8, V4L2_MBUS_FMT_Y8_1X8,
+	  V4L2_PIX_FMT_GREY, 8, },
+	{ V4L2_MBUS_FMT_Y10_1X10, V4L2_MBUS_FMT_Y10_1X10,
+	  V4L2_MBUS_FMT_Y10_1X10, V4L2_MBUS_FMT_Y8_1X8,
+	  V4L2_PIX_FMT_Y10, 10, },
+	{ V4L2_MBUS_FMT_Y12_1X12, V4L2_MBUS_FMT_Y10_1X10,
+	  V4L2_MBUS_FMT_Y12_1X12, V4L2_MBUS_FMT_Y8_1X8,
+	  V4L2_PIX_FMT_Y12, 12, },
+	{ V4L2_MBUS_FMT_SBGGR8_1X8, V4L2_MBUS_FMT_SBGGR8_1X8,
+	  V4L2_MBUS_FMT_SBGGR8_1X8, V4L2_MBUS_FMT_SBGGR8_1X8,
+	  V4L2_PIX_FMT_SBGGR8, 8, },
+	{ V4L2_MBUS_FMT_SGBRG8_1X8, V4L2_MBUS_FMT_SGBRG8_1X8,
+	  V4L2_MBUS_FMT_SGBRG8_1X8, V4L2_MBUS_FMT_SGBRG8_1X8,
+	  V4L2_PIX_FMT_SGBRG8, 8, },
+	{ V4L2_MBUS_FMT_SGRBG8_1X8, V4L2_MBUS_FMT_SGRBG8_1X8,
+	  V4L2_MBUS_FMT_SGRBG8_1X8, V4L2_MBUS_FMT_SGRBG8_1X8,
+	  V4L2_PIX_FMT_SGRBG8, 8, },
+	{ V4L2_MBUS_FMT_SRGGB8_1X8, V4L2_MBUS_FMT_SRGGB8_1X8,
+	  V4L2_MBUS_FMT_SRGGB8_1X8, V4L2_MBUS_FMT_SRGGB8_1X8,
+	  V4L2_PIX_FMT_SRGGB8, 8, },
+	{ V4L2_MBUS_FMT_SGRBG10_DPCM8_1X8, V4L2_MBUS_FMT_SGRBG10_DPCM8_1X8,
+	  V4L2_MBUS_FMT_SGRBG10_1X10, 0,
+	  V4L2_PIX_FMT_SGRBG10DPCM8, 8, },
+	{ V4L2_MBUS_FMT_SBGGR10_1X10, V4L2_MBUS_FMT_SBGGR10_1X10,
+	  V4L2_MBUS_FMT_SBGGR10_1X10, V4L2_MBUS_FMT_SBGGR8_1X8,
+	  V4L2_PIX_FMT_SBGGR10, 10, },
+	{ V4L2_MBUS_FMT_SGBRG10_1X10, V4L2_MBUS_FMT_SGBRG10_1X10,
+	  V4L2_MBUS_FMT_SGBRG10_1X10, V4L2_MBUS_FMT_SGBRG8_1X8,
+	  V4L2_PIX_FMT_SGBRG10, 10, },
+	{ V4L2_MBUS_FMT_SGRBG10_1X10, V4L2_MBUS_FMT_SGRBG10_1X10,
+	  V4L2_MBUS_FMT_SGRBG10_1X10, V4L2_MBUS_FMT_SGRBG8_1X8,
+	  V4L2_PIX_FMT_SGRBG10, 10, },
+	{ V4L2_MBUS_FMT_SRGGB10_1X10, V4L2_MBUS_FMT_SRGGB10_1X10,
+	  V4L2_MBUS_FMT_SRGGB10_1X10, V4L2_MBUS_FMT_SRGGB8_1X8,
+	  V4L2_PIX_FMT_SRGGB10, 10, },
+	{ V4L2_MBUS_FMT_SBGGR12_1X12, V4L2_MBUS_FMT_SBGGR10_1X10,
+	  V4L2_MBUS_FMT_SBGGR12_1X12, V4L2_MBUS_FMT_SBGGR8_1X8,
+	  V4L2_PIX_FMT_SBGGR12, 12, },
+	{ V4L2_MBUS_FMT_SGBRG12_1X12, V4L2_MBUS_FMT_SGBRG10_1X10,
+	  V4L2_MBUS_FMT_SGBRG12_1X12, V4L2_MBUS_FMT_SGBRG8_1X8,
+	  V4L2_PIX_FMT_SGBRG12, 12, },
+	{ V4L2_MBUS_FMT_SGRBG12_1X12, V4L2_MBUS_FMT_SGRBG10_1X10,
+	  V4L2_MBUS_FMT_SGRBG12_1X12, V4L2_MBUS_FMT_SGRBG8_1X8,
+	  V4L2_PIX_FMT_SGRBG12, 12, },
+	{ V4L2_MBUS_FMT_SRGGB12_1X12, V4L2_MBUS_FMT_SRGGB10_1X10,
+	  V4L2_MBUS_FMT_SRGGB12_1X12, V4L2_MBUS_FMT_SRGGB8_1X8,
+	  V4L2_PIX_FMT_SRGGB12, 12, },
+	{ V4L2_MBUS_FMT_UYVY8_1X16, V4L2_MBUS_FMT_UYVY8_1X16,
+	  V4L2_MBUS_FMT_UYVY8_1X16, 0,
+	  V4L2_PIX_FMT_UYVY, 16, },
+	{ V4L2_MBUS_FMT_YUYV8_1X16, V4L2_MBUS_FMT_YUYV8_1X16,
+	  V4L2_MBUS_FMT_YUYV8_1X16, 0,
+	  V4L2_PIX_FMT_YUYV, 16, },
+	{ V4L2_MBUS_FMT_YUYV8_1_5X8, V4L2_MBUS_FMT_YUYV8_1_5X8,
+	  V4L2_MBUS_FMT_YUYV8_1_5X8, 0,
+	  V4L2_PIX_FMT_NV12, 8, },
+};
+
+const struct iss_format_info *
+omap4iss_video_format_info(enum v4l2_mbus_pixelcode code)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(formats); ++i) {
+		if (formats[i].code == code)
+			return &formats[i];
+	}
+
+	return NULL;
+}
+
+/*
+ * iss_video_mbus_to_pix - Convert v4l2_mbus_framefmt to v4l2_pix_format
+ * @video: ISS 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 iss_video_mbus_to_pix(const struct iss_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;
+
+	/* 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) - 1; ++i) {
+		if (formats[i].code == mbus->code)
+			break;
+	}
+
+	min_bpl = pix->width * ALIGN(formats[i].bpp, 8) / 8;
+
+	/* 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;
+
+	/* FIXME: Special case for NV12! We should make this nicer... */
+	if (pix->pixelformat == V4L2_PIX_FMT_NV12)
+		pix->sizeimage += (pix->bytesperline * pix->height) / 2;
+
+	return bpl - min_bpl;
+}
+
+static void iss_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;
+
+	for (i = 0; i < ARRAY_SIZE(formats); ++i) {
+		if (formats[i].pixelformat == pix->pixelformat)
+			break;
+	}
+
+	if (WARN_ON(i == ARRAY_SIZE(formats)))
+		return;
+
+	mbus->code = formats[i].code;
+	mbus->colorspace = pix->colorspace;
+	mbus->field = pix->field;
+}
+
+static struct v4l2_subdev *
+iss_video_remote_subdev(struct iss_video *video, u32 *pad)
+{
+	struct media_pad *remote;
+
+	remote = media_entity_remote_pad(&video->pad);
+
+	if (remote == NULL ||
+	    media_entity_type(remote->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
+		return NULL;
+
+	if (pad)
+		*pad = remote->index;
+
+	return media_entity_to_v4l2_subdev(remote->entity);
+}
+
+/* Return a pointer to the ISS video instance at the far end of the pipeline. */
+static struct iss_video *
+iss_video_far_end(struct iss_video *video)
+{
+	struct media_entity_graph graph;
+	struct media_entity *entity = &video->video.entity;
+	struct media_device *mdev = entity->parent;
+	struct iss_video *far_end = NULL;
+
+	mutex_lock(&mdev->graph_mutex);
+	media_entity_graph_walk_start(&graph, entity);
+
+	while ((entity = media_entity_graph_walk_next(&graph))) {
+		if (entity == &video->video.entity)
+			continue;
+
+		if (media_entity_type(entity) != MEDIA_ENT_T_DEVNODE)
+			continue;
+
+		far_end = to_iss_video(media_entity_to_video_device(entity));
+		if (far_end->type != video->type)
+			break;
+
+		far_end = NULL;
+	}
+
+	mutex_unlock(&mdev->graph_mutex);
+	return far_end;
+}
+
+static int
+__iss_video_get_format(struct iss_video *video, struct v4l2_format *format)
+{
+	struct v4l2_subdev_format fmt;
+	struct v4l2_subdev *subdev;
+	u32 pad;
+	int ret;
+
+	subdev = iss_video_remote_subdev(video, &pad);
+	if (subdev == NULL)
+		return -EINVAL;
+
+	mutex_lock(&video->mutex);
+
+	fmt.pad = pad;
+	fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
+	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
+	if (ret == -ENOIOCTLCMD)
+		ret = -EINVAL;
+
+	mutex_unlock(&video->mutex);
+
+	if (ret)
+		return ret;
+
+	format->type = video->type;
+	return iss_video_mbus_to_pix(video, &fmt.format, &format->fmt.pix);
+}
+
+static int
+iss_video_check_format(struct iss_video *video, struct iss_video_fh *vfh)
+{
+	struct v4l2_format format;
+	int ret;
+
+	memcpy(&format, &vfh->format, sizeof(format));
+	ret = __iss_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)
+		return -EINVAL;
+
+	return ret;
+}
+
+/* -----------------------------------------------------------------------------
+ * Video queue operations
+ */
+
+static int iss_video_queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
+				 unsigned int *count, unsigned int *num_planes,
+				 unsigned int sizes[], void *alloc_ctxs[])
+{
+	struct iss_video_fh *vfh = vb2_get_drv_priv(vq);
+	struct iss_video *video = vfh->video;
+
+	/* Revisit multi-planar support for NV12 */
+	*num_planes = 1;
+
+	sizes[0] = vfh->format.fmt.pix.sizeimage;
+	if (sizes[0] == 0)
+		return -EINVAL;
+
+	alloc_ctxs[0] = video->alloc_ctx;
+
+	*count = min(*count, (unsigned int)(video->capture_mem / PAGE_ALIGN(sizes[0])));
+
+	return 0;
+}
+
+static void iss_video_buf_cleanup(struct vb2_buffer *vb)
+{
+	struct iss_buffer *buffer = container_of(vb, struct iss_buffer, vb);
+
+	if (buffer->iss_addr)
+		buffer->iss_addr = 0;
+}
+
+static int iss_video_buf_prepare(struct vb2_buffer *vb)
+{
+	struct iss_video_fh *vfh = vb2_get_drv_priv(vb->vb2_queue);
+	struct iss_buffer *buffer = container_of(vb, struct iss_buffer, vb);
+	struct iss_video *video = vfh->video;
+	unsigned long size = vfh->format.fmt.pix.sizeimage;
+	dma_addr_t addr;
+
+	if (vb2_plane_size(vb, 0) < size)
+		return -ENOBUFS;
+
+	addr = vb2_dma_contig_plane_dma_addr(vb, 0);
+	if (!IS_ALIGNED(addr, 32)) {
+		dev_dbg(video->iss->dev, "Buffer address must be "
+			"aligned to 32 bytes boundary.\n");
+		return -EINVAL;
+	}
+
+	vb2_set_plane_payload(vb, 0, size);
+	buffer->iss_addr = addr;
+	return 0;
+}
+
+static void iss_video_buf_queue(struct vb2_buffer *vb)
+{
+	struct iss_video_fh *vfh = vb2_get_drv_priv(vb->vb2_queue);
+	struct iss_video *video = vfh->video;
+	struct iss_buffer *buffer = container_of(vb, struct iss_buffer, vb);
+	struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
+	unsigned int empty;
+	unsigned long flags;
+
+	spin_lock_irqsave(&video->qlock, flags);
+	empty = list_empty(&video->dmaqueue);
+	list_add_tail(&buffer->list, &video->dmaqueue);
+	spin_unlock_irqrestore(&video->qlock, flags);
+
+	if (empty) {
+		enum iss_pipeline_state state;
+		unsigned int start;
+
+		if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+			state = ISS_PIPELINE_QUEUE_OUTPUT;
+		else
+			state = ISS_PIPELINE_QUEUE_INPUT;
+
+		spin_lock_irqsave(&pipe->lock, flags);
+		pipe->state |= state;
+		video->ops->queue(video, buffer);
+		video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_QUEUED;
+
+		start = iss_pipeline_ready(pipe);
+		if (start)
+			pipe->state |= ISS_PIPELINE_STREAM;
+		spin_unlock_irqrestore(&pipe->lock, flags);
+
+		if (start)
+			omap4iss_pipeline_set_stream(pipe,
+						ISS_PIPELINE_STREAM_SINGLESHOT);
+	}
+}
+
+static struct vb2_ops iss_video_vb2ops = {
+	.queue_setup	= iss_video_queue_setup,
+	.buf_prepare	= iss_video_buf_prepare,
+	.buf_queue	= iss_video_buf_queue,
+	.buf_cleanup	= iss_video_buf_cleanup,
+};
+
+/*
+ * omap4iss_video_buffer_next - Complete the current buffer and return the next
+ * @video: ISS video object
+ *
+ * Remove the current video buffer from the DMA queue and fill its timestamp,
+ * field count and state fields before waking up its completion handler.
+ *
+ * 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.
+ *
+ * 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 iss_buffer *omap4iss_video_buffer_next(struct iss_video *video)
+{
+	struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
+	enum iss_pipeline_state state;
+	struct iss_buffer *buf;
+	unsigned long flags;
+	struct timespec ts;
+
+	spin_lock_irqsave(&video->qlock, flags);
+	if (WARN_ON(list_empty(&video->dmaqueue))) {
+		spin_unlock_irqrestore(&video->qlock, flags);
+		return NULL;
+	}
+
+	buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
+			       list);
+	list_del(&buf->list);
+	spin_unlock_irqrestore(&video->qlock, flags);
+
+	ktime_get_ts(&ts);
+	buf->vb.v4l2_buf.timestamp.tv_sec = ts.tv_sec;
+	buf->vb.v4l2_buf.timestamp.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
+
+	/* 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.v4l2_buf.sequence = atomic_inc_return(&pipe->frame_number);
+	else
+		buf->vb.v4l2_buf.sequence = atomic_read(&pipe->frame_number);
+
+	vb2_buffer_done(&buf->vb, pipe->error ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
+	pipe->error = false;
+
+	spin_lock_irqsave(&video->qlock, flags);
+	if (list_empty(&video->dmaqueue)) {
+		spin_unlock_irqrestore(&video->qlock, flags);
+		if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+			state = ISS_PIPELINE_QUEUE_OUTPUT
+			      | ISS_PIPELINE_STREAM;
+		else
+			state = ISS_PIPELINE_QUEUE_INPUT
+			      | ISS_PIPELINE_STREAM;
+
+		spin_lock_irqsave(&pipe->lock, flags);
+		pipe->state &= ~state;
+		if (video->pipe.stream_state == ISS_PIPELINE_STREAM_CONTINUOUS)
+			video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_UNDERRUN;
+		spin_unlock_irqrestore(&pipe->lock, flags);
+		return NULL;
+	}
+
+	if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && pipe->input != NULL) {
+		spin_lock_irqsave(&pipe->lock, flags);
+		pipe->state &= ~ISS_PIPELINE_STREAM;
+		spin_unlock_irqrestore(&pipe->lock, flags);
+	}
+
+	buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
+			       list);
+	spin_unlock_irqrestore(&video->qlock, flags);
+	buf->vb.state = VB2_BUF_STATE_ACTIVE;
+	return buf;
+}
+
+/* -----------------------------------------------------------------------------
+ * V4L2 ioctls
+ */
+
+static int
+iss_video_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
+{
+	struct iss_video *video = video_drvdata(file);
+
+	strlcpy(cap->driver, ISS_VIDEO_DRIVER_NAME, sizeof(cap->driver));
+	strlcpy(cap->card, video->video.name, sizeof(cap->card));
+	strlcpy(cap->bus_info, "media", sizeof(cap->bus_info));
+
+	if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
+	else
+		cap->capabilities = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
+
+	return 0;
+}
+
+static int
+iss_video_get_format(struct file *file, void *fh, struct v4l2_format *format)
+{
+	struct iss_video_fh *vfh = to_iss_video_fh(fh);
+	struct iss_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
+iss_video_set_format(struct file *file, void *fh, struct v4l2_format *format)
+{
+	struct iss_video_fh *vfh = to_iss_video_fh(fh);
+	struct iss_video *video = video_drvdata(file);
+	struct v4l2_mbus_framefmt fmt;
+
+	if (format->type != video->type)
+		return -EINVAL;
+
+	mutex_lock(&video->mutex);
+
+	/* Fill the bytesperline and sizeimage fields by converting to media bus
+	 * format and back to pixel format.
+	 */
+	iss_video_pix_to_mbus(&format->fmt.pix, &fmt);
+	iss_video_mbus_to_pix(video, &fmt, &format->fmt.pix);
+
+	vfh->format = *format;
+
+	mutex_unlock(&video->mutex);
+	return 0;
+}
+
+static int
+iss_video_try_format(struct file *file, void *fh, struct v4l2_format *format)
+{
+	struct iss_video *video = video_drvdata(file);
+	struct v4l2_subdev_format fmt;
+	struct v4l2_subdev *subdev;
+	u32 pad;
+	int ret;
+
+	if (format->type != video->type)
+		return -EINVAL;
+
+	subdev = iss_video_remote_subdev(video, &pad);
+	if (subdev == NULL)
+		return -EINVAL;
+
+	iss_video_pix_to_mbus(&format->fmt.pix, &fmt.format);
+
+	fmt.pad = pad;
+	fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
+	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
+	if (ret)
+		return ret == -ENOIOCTLCMD ? -EINVAL : ret;
+
+	iss_video_mbus_to_pix(video, &fmt.format, &format->fmt.pix);
+	return 0;
+}
+
+static int
+iss_video_cropcap(struct file *file, void *fh, struct v4l2_cropcap *cropcap)
+{
+	struct iss_video *video = video_drvdata(file);
+	struct v4l2_subdev *subdev;
+	int ret;
+
+	subdev = iss_video_remote_subdev(video, NULL);
+	if (subdev == NULL)
+		return -EINVAL;
+
+	mutex_lock(&video->mutex);
+	ret = v4l2_subdev_call(subdev, video, cropcap, cropcap);
+	mutex_unlock(&video->mutex);
+
+	return ret == -ENOIOCTLCMD ? -EINVAL : ret;
+}
+
+static int
+iss_video_get_crop(struct file *file, void *fh, struct v4l2_crop *crop)
+{
+	struct iss_video *video = video_drvdata(file);
+	struct v4l2_subdev_format format;
+	struct v4l2_subdev *subdev;
+	u32 pad;
+	int ret;
+
+	subdev = iss_video_remote_subdev(video, &pad);
+	if (subdev == NULL)
+		return -EINVAL;
+
+	/* Try the get crop operation first and fallback to get format if not
+	 * implemented.
+	 */
+	ret = v4l2_subdev_call(subdev, video, g_crop, crop);
+	if (ret != -ENOIOCTLCMD)
+		return ret;
+
+	format.pad = pad;
+	format.which = V4L2_SUBDEV_FORMAT_ACTIVE;
+	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &format);
+	if (ret < 0)
+		return ret == -ENOIOCTLCMD ? -EINVAL : ret;
+
+	crop->c.left = 0;
+	crop->c.top = 0;
+	crop->c.width = format.format.width;
+	crop->c.height = format.format.height;
+
+	return 0;
+}
+
+static int
+iss_video_set_crop(struct file *file, void *fh, const struct v4l2_crop *crop)
+{
+	struct iss_video *video = video_drvdata(file);
+	struct v4l2_subdev *subdev;
+	int ret;
+
+	subdev = iss_video_remote_subdev(video, NULL);
+	if (subdev == NULL)
+		return -EINVAL;
+
+	mutex_lock(&video->mutex);
+	ret = v4l2_subdev_call(subdev, video, s_crop, crop);
+	mutex_unlock(&video->mutex);
+
+	return ret == -ENOIOCTLCMD ? -EINVAL : ret;
+}
+
+static int
+iss_video_get_param(struct file *file, void *fh, struct v4l2_streamparm *a)
+{
+	struct iss_video_fh *vfh = to_iss_video_fh(fh);
+	struct iss_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
+iss_video_set_param(struct file *file, void *fh, struct v4l2_streamparm *a)
+{
+	struct iss_video_fh *vfh = to_iss_video_fh(fh);
+	struct iss_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;
+
+	vfh->timeperframe = a->parm.output.timeperframe;
+
+	return 0;
+}
+
+static int
+iss_video_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *rb)
+{
+	struct iss_video_fh *vfh = to_iss_video_fh(fh);
+
+	return vb2_reqbufs(&vfh->queue, rb);
+}
+
+static int
+iss_video_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
+{
+	struct iss_video_fh *vfh = to_iss_video_fh(fh);
+
+	return vb2_querybuf(&vfh->queue, b);
+}
+
+static int
+iss_video_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
+{
+	struct iss_video_fh *vfh = to_iss_video_fh(fh);
+
+	return vb2_qbuf(&vfh->queue, b);
+}
+
+static int
+iss_video_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
+{
+	struct iss_video_fh *vfh = to_iss_video_fh(fh);
+
+	return vb2_dqbuf(&vfh->queue, b, file->f_flags & O_NONBLOCK);
+}
+
+/*
+ * Stream management
+ *
+ * Every ISS 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 ISS 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. ISS 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 videobuf queue callback with
+ * the buffers queue spinlock held. The modules subdev set stream operation must
+ * not sleep.
+ */
+static int
+iss_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
+{
+	struct iss_video_fh *vfh = to_iss_video_fh(fh);
+	struct iss_video *video = video_drvdata(file);
+	enum iss_pipeline_state state;
+	struct iss_pipeline *pipe;
+	struct iss_video *far_end;
+	unsigned long flags;
+	int ret;
+
+	if (type != video->type)
+		return -EINVAL;
+
+	mutex_lock(&video->stream_lock);
+
+	if (video->streaming) {
+		mutex_unlock(&video->stream_lock);
+		return -EBUSY;
+	}
+
+	/* Start streaming on the pipeline. No link touching an entity in the
+	 * pipeline can be activated or deactivated once streaming is started.
+	 */
+	pipe = video->video.entity.pipe
+	     ? to_iss_pipeline(&video->video.entity) : &video->pipe;
+	pipe->external = NULL;
+	pipe->external_rate = 0;
+	pipe->external_bpp = 0;
+
+	if (video->iss->pdata->set_constraints)
+		video->iss->pdata->set_constraints(video->iss, true);
+
+	ret = media_entity_pipeline_start(&video->video.entity, &pipe->pipe);
+	if (ret < 0)
+		goto err_media_entity_pipeline_start;
+
+	/* Verify that the currently configured format matches the output of
+	 * the connected subdev.
+	 */
+	ret = iss_video_check_format(video, vfh);
+	if (ret < 0)
+		goto err_iss_video_check_format;
+
+	video->bpl_padding = ret;
+	video->bpl_value = vfh->format.fmt.pix.bytesperline;
+
+	/* Find the ISS video node connected at the far end of the pipeline and
+	 * update the pipeline.
+	 */
+	far_end = iss_video_far_end(video);
+
+	if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+		state = ISS_PIPELINE_STREAM_OUTPUT | ISS_PIPELINE_IDLE_OUTPUT;
+		pipe->input = far_end;
+		pipe->output = video;
+	} else {
+		if (far_end == NULL) {
+			ret = -EPIPE;
+			goto err_iss_video_check_format;
+		}
+
+		state = ISS_PIPELINE_STREAM_INPUT | ISS_PIPELINE_IDLE_INPUT;
+		pipe->input = video;
+		pipe->output = far_end;
+	}
+
+	spin_lock_irqsave(&pipe->lock, flags);
+	pipe->state &= ~ISS_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);
+	spin_lock_init(&video->qlock);
+	atomic_set(&pipe->frame_number, -1);
+
+	ret = vb2_streamon(&vfh->queue, type);
+	if (ret < 0)
+		goto err_iss_video_check_format;
+
+	/* 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 == NULL) {
+		unsigned long flags;
+		ret = omap4iss_pipeline_set_stream(pipe,
+					      ISS_PIPELINE_STREAM_CONTINUOUS);
+		if (ret < 0)
+			goto err_omap4iss_set_stream;
+		spin_lock_irqsave(&video->qlock, flags);
+		if (list_empty(&video->dmaqueue))
+			video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_UNDERRUN;
+		spin_unlock_irqrestore(&video->qlock, flags);
+	}
+
+	if (ret < 0) {
+err_omap4iss_set_stream:
+		vb2_streamoff(&vfh->queue, type);
+err_iss_video_check_format:
+		media_entity_pipeline_stop(&video->video.entity);
+err_media_entity_pipeline_start:
+		if (video->iss->pdata->set_constraints)
+			video->iss->pdata->set_constraints(video->iss, false);
+		video->queue = NULL;
+	}
+
+	if (!ret)
+		video->streaming = 1;
+
+	mutex_unlock(&video->stream_lock);
+	return ret;
+}
+
+static int
+iss_video_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
+{
+	struct iss_video_fh *vfh = to_iss_video_fh(fh);
+	struct iss_video *video = video_drvdata(file);
+	struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
+	enum iss_pipeline_state state;
+	unsigned long flags;
+
+	if (type != video->type)
+		return -EINVAL;
+
+	mutex_lock(&video->stream_lock);
+
+	if (!vb2_is_streaming(&vfh->queue))
+		goto done;
+
+	/* Update the pipeline state. */
+	if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		state = ISS_PIPELINE_STREAM_OUTPUT
+		      | ISS_PIPELINE_QUEUE_OUTPUT;
+	else
+		state = ISS_PIPELINE_STREAM_INPUT
+		      | ISS_PIPELINE_QUEUE_INPUT;
+
+	spin_lock_irqsave(&pipe->lock, flags);
+	pipe->state &= ~state;
+	spin_unlock_irqrestore(&pipe->lock, flags);
+
+	/* Stop the stream. */
+	omap4iss_pipeline_set_stream(pipe, ISS_PIPELINE_STREAM_STOPPED);
+	vb2_streamoff(&vfh->queue, type);
+	video->queue = NULL;
+	video->streaming = 0;
+
+	if (video->iss->pdata->set_constraints)
+		video->iss->pdata->set_constraints(video->iss, false);
+	media_entity_pipeline_stop(&video->video.entity);
+
+done:
+	mutex_unlock(&video->stream_lock);
+	return 0;
+}
+
+static int
+iss_video_enum_input(struct file *file, void *fh, struct v4l2_input *input)
+{
+	if (input->index > 0)
+		return -EINVAL;
+
+	strlcpy(input->name, "camera", sizeof(input->name));
+	input->type = V4L2_INPUT_TYPE_CAMERA;
+
+	return 0;
+}
+
+static int
+iss_video_g_input(struct file *file, void *fh, unsigned int *input)
+{
+	*input = 0;
+
+	return 0;
+}
+
+static const struct v4l2_ioctl_ops iss_video_ioctl_ops = {
+	.vidioc_querycap		= iss_video_querycap,
+	.vidioc_g_fmt_vid_cap		= iss_video_get_format,
+	.vidioc_s_fmt_vid_cap		= iss_video_set_format,
+	.vidioc_try_fmt_vid_cap		= iss_video_try_format,
+	.vidioc_g_fmt_vid_out		= iss_video_get_format,
+	.vidioc_s_fmt_vid_out		= iss_video_set_format,
+	.vidioc_try_fmt_vid_out		= iss_video_try_format,
+	.vidioc_cropcap			= iss_video_cropcap,
+	.vidioc_g_crop			= iss_video_get_crop,
+	.vidioc_s_crop			= iss_video_set_crop,
+	.vidioc_g_parm			= iss_video_get_param,
+	.vidioc_s_parm			= iss_video_set_param,
+	.vidioc_reqbufs			= iss_video_reqbufs,
+	.vidioc_querybuf		= iss_video_querybuf,
+	.vidioc_qbuf			= iss_video_qbuf,
+	.vidioc_dqbuf			= iss_video_dqbuf,
+	.vidioc_streamon		= iss_video_streamon,
+	.vidioc_streamoff		= iss_video_streamoff,
+	.vidioc_enum_input		= iss_video_enum_input,
+	.vidioc_g_input			= iss_video_g_input,
+};
+
+/* -----------------------------------------------------------------------------
+ * V4L2 file operations
+ */
+
+static int iss_video_open(struct file *file)
+{
+	struct iss_video *video = video_drvdata(file);
+	struct iss_video_fh *handle;
+	struct vb2_queue *q;
+	int ret = 0;
+
+	handle = kzalloc(sizeof(*handle), GFP_KERNEL);
+	if (handle == NULL)
+		return -ENOMEM;
+
+	v4l2_fh_init(&handle->vfh, &video->video);
+	v4l2_fh_add(&handle->vfh);
+
+	/* If this is the first user, initialise the pipeline. */
+	if (omap4iss_get(video->iss) == NULL) {
+		ret = -EBUSY;
+		goto done;
+	}
+
+	ret = omap4iss_pipeline_pm_use(&video->video.entity, 1);
+	if (ret < 0) {
+		omap4iss_put(video->iss);
+		goto done;
+	}
+
+	video->alloc_ctx = vb2_dma_contig_init_ctx(video->iss->dev);
+	if (IS_ERR(video->alloc_ctx)) {
+		ret = PTR_ERR(video->alloc_ctx);
+		omap4iss_put(video->iss);
+		goto done;
+	}
+
+	q = &handle->queue;
+
+	q->type = video->type;
+	q->io_modes = VB2_MMAP;
+	q->drv_priv = handle;
+	q->ops = &iss_video_vb2ops;
+	q->mem_ops = &vb2_dma_contig_memops;
+	q->buf_struct_size = sizeof(struct iss_buffer);
+
+	ret = vb2_queue_init(q);
+	if (ret) {
+		omap4iss_put(video->iss);
+		goto done;
+	}
+
+	memset(&handle->format, 0, sizeof(handle->format));
+	handle->format.type = video->type;
+	handle->timeperframe.denominator = 1;
+
+	handle->video = video;
+	file->private_data = &handle->vfh;
+
+done:
+	if (ret < 0) {
+		v4l2_fh_del(&handle->vfh);
+		kfree(handle);
+	}
+
+	return ret;
+}
+
+static int iss_video_release(struct file *file)
+{
+	struct iss_video *video = video_drvdata(file);
+	struct v4l2_fh *vfh = file->private_data;
+	struct iss_video_fh *handle = to_iss_video_fh(vfh);
+
+	/* Disable streaming and free the buffers queue resources. */
+	iss_video_streamoff(file, vfh, video->type);
+
+	omap4iss_pipeline_pm_use(&video->video.entity, 0);
+
+	/* Release the videobuf2 queue */
+	vb2_queue_release(&handle->queue);
+
+	/* Release the file handle. */
+	v4l2_fh_del(vfh);
+	kfree(handle);
+	file->private_data = NULL;
+
+	omap4iss_put(video->iss);
+
+	return 0;
+}
+
+static unsigned int iss_video_poll(struct file *file, poll_table *wait)
+{
+	struct iss_video_fh *vfh = to_iss_video_fh(file->private_data);
+
+	return vb2_poll(&vfh->queue, file, wait);
+}
+
+static int iss_video_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	struct iss_video_fh *vfh = to_iss_video_fh(file->private_data);
+
+	return vb2_mmap(&vfh->queue, vma);;
+}
+
+static struct v4l2_file_operations iss_video_fops = {
+	.owner = THIS_MODULE,
+	.unlocked_ioctl = video_ioctl2,
+	.open = iss_video_open,
+	.release = iss_video_release,
+	.poll = iss_video_poll,
+	.mmap = iss_video_mmap,
+};
+
+/* -----------------------------------------------------------------------------
+ * ISS video core
+ */
+
+static const struct iss_video_operations iss_video_dummy_ops = {
+};
+
+int omap4iss_video_init(struct iss_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;
+		break;
+	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
+		direction = "input";
+		video->pad.flags = MEDIA_PAD_FL_SOURCE;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	ret = media_entity_init(&video->video.entity, 1, &video->pad, 0);
+	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);
+
+	/* Initialize the video device. */
+	if (video->ops == NULL)
+		video->ops = &iss_video_dummy_ops;
+
+	video->video.fops = &iss_video_fops;
+	snprintf(video->video.name, sizeof(video->video.name),
+		 "OMAP4 ISS %s %s", name, direction);
+	video->video.vfl_type = VFL_TYPE_GRABBER;
+	video->video.release = video_device_release_empty;
+	video->video.ioctl_ops = &iss_video_ioctl_ops;
+	video->pipe.stream_state = ISS_PIPELINE_STREAM_STOPPED;
+
+	video_set_drvdata(&video->video, video);
+
+	return 0;
+}
+
+void omap4iss_video_cleanup(struct iss_video *video)
+{
+	media_entity_cleanup(&video->video.entity);
+	mutex_destroy(&video->stream_lock);
+	mutex_destroy(&video->mutex);
+}
+
+int omap4iss_video_register(struct iss_video *video, struct v4l2_device *vdev)
+{
+	int ret;
+
+	video->video.v4l2_dev = vdev;
+
+	ret = video_register_device(&video->video, VFL_TYPE_GRABBER, -1);
+	if (ret < 0)
+		printk(KERN_ERR "%s: could not register video device (%d)\n",
+			__func__, ret);
+
+	return ret;
+}
+
+void omap4iss_video_unregister(struct iss_video *video)
+{
+	if (video_is_registered(&video->video))
+		video_unregister_device(&video->video);
+}

drivers/staging/media/omap4iss/iss_video.h

+/*
+ * TI OMAP4 ISS V4L2 Driver - Generic video node
+ *
+ * Copyright (C) 2012 Texas Instruments, Inc.
+ *
+ * Author: Sergio Aguirre <sergio.a.aguirre@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef OMAP4_ISS_VIDEO_H
+#define OMAP4_ISS_VIDEO_H
+
+#include <linux/v4l2-mediabus.h>
+#include <media/media-entity.h>
+#include <media/v4l2-dev.h>
+#include <media/v4l2-fh.h>
+#include <media/videobuf2-core.h>
+#include <media/videobuf2-dma-contig.h>
+
+#define ISS_VIDEO_DRIVER_NAME		"issvideo"
+#define ISS_VIDEO_DRIVER_VERSION	"0.0.2"
+
+struct iss_device;
+struct iss_video;
+struct v4l2_mbus_framefmt;
+struct v4l2_pix_format;
+
+/*
+ * struct iss_format_info - ISS media bus format information
+ * @code: V4L2 media bus format code
+ * @truncated: V4L2 media bus format code for the same format truncated to 10
+ *	bits. Identical to @code if the format is 10 bits wide or less.
+ * @uncompressed: V4L2 media bus format code for the corresponding uncompressed
+ *	format. Identical to @code if the format is not DPCM compressed.
+ * @flavor: V4L2 media bus format code for the same pixel layout but
+ *	shifted to be 8 bits per pixel. =0 if format is not shiftable.
+ * @pixelformat: V4L2 pixel format FCC identifier
+ * @bpp: Bits per pixel
+ */
+struct iss_format_info {
+	enum v4l2_mbus_pixelcode code;
+	enum v4l2_mbus_pixelcode truncated;
+	enum v4l2_mbus_pixelcode uncompressed;
+	enum v4l2_mbus_pixelcode flavor;
+	u32 pixelformat;
+	unsigned int bpp;
+};
+
+enum iss_pipeline_stream_state {
+	ISS_PIPELINE_STREAM_STOPPED = 0,
+	ISS_PIPELINE_STREAM_CONTINUOUS = 1,
+	ISS_PIPELINE_STREAM_SINGLESHOT = 2,
+};
+
+enum iss_pipeline_state {
+	/* The stream has been started on the input video node. */
+	ISS_PIPELINE_STREAM_INPUT = 1,
+	/* The stream has been started on the output video node. */
+	ISS_PIPELINE_STREAM_OUTPUT = (1 << 1),
+	/* At least one buffer is queued on the input video node. */
+	ISS_PIPELINE_QUEUE_INPUT = (1 << 2),
+	/* At least one buffer is queued on the output video node. */
+	ISS_PIPELINE_QUEUE_OUTPUT = (1 << 3),
+	/* The input entity is idle, ready to be started. */
+	ISS_PIPELINE_IDLE_INPUT = (1 << 4),
+	/* The output entity is idle, ready to be started. */
+	ISS_PIPELINE_IDLE_OUTPUT = (1 << 5),
+	/* The pipeline is currently streaming. */
+	ISS_PIPELINE_STREAM = (1 << 6),
+};
+
+/*
+ * struct iss_pipeline - An OMAP4 ISS hardware pipeline
+ * @error: A hardware error occurred during capture
+ */
+struct iss_pipeline {
+	struct media_pipeline pipe;
+	spinlock_t lock;		/* Pipeline state and queue flags */
+	unsigned int state;
+	enum iss_pipeline_stream_state stream_state;
+	struct iss_video *input;
+	struct iss_video *output;
+	atomic_t frame_number;
+	bool do_propagation; /* of frame number */
+	bool error;
+	struct v4l2_fract max_timeperframe;
+	struct v4l2_subdev *external;
+	unsigned int external_rate;
+	int external_bpp;
+};
+
+#define to_iss_pipeline(__e) \
+	container_of((__e)->pipe, struct iss_pipeline, pipe)
+
+static inline int iss_pipeline_ready(struct iss_pipeline *pipe)
+{
+	return pipe->state == (ISS_PIPELINE_STREAM_INPUT |
+			       ISS_PIPELINE_STREAM_OUTPUT |
+			       ISS_PIPELINE_QUEUE_INPUT |
+			       ISS_PIPELINE_QUEUE_OUTPUT |
+			       ISS_PIPELINE_IDLE_INPUT |
+			       ISS_PIPELINE_IDLE_OUTPUT);
+}
+
+/*
+ * struct iss_buffer - ISS buffer
+ * @buffer: ISS video buffer
+ * @iss_addr: Physical address of the buffer.
+ */
+struct iss_buffer {
+	/* common v4l buffer stuff -- must be first */
+	struct vb2_buffer	vb;
+	struct list_head	list;
+	dma_addr_t iss_addr;
+};
+
+#define to_iss_buffer(buf)	container_of(buf, struct iss_buffer, buffer)
+
+enum iss_video_dmaqueue_flags {
+	/* Set if DMA queue becomes empty when ISS_PIPELINE_STREAM_CONTINUOUS */
+	ISS_VIDEO_DMAQUEUE_UNDERRUN = (1 << 0),
+	/* Set when queuing buffer to an empty DMA queue */
+	ISS_VIDEO_DMAQUEUE_QUEUED = (1 << 1),
+};
+
+#define iss_video_dmaqueue_flags_clr(video)	\
+			({ (video)->dmaqueue_flags = 0; })
+
+/*
+ * struct iss_video_operations - ISS video operations
+ * @queue:	Resume streaming when a buffer is queued. Called on VIDIOC_QBUF
+ *		if there was no buffer previously queued.
+ */
+struct iss_video_operations {
+	int(*queue)(struct iss_video *video, struct iss_buffer *buffer);
+};
+
+struct iss_video {
+	struct video_device video;
+	enum v4l2_buf_type type;
+	struct media_pad pad;
+
+	struct mutex mutex;		/* format and crop settings */
+	atomic_t active;
+
+	struct iss_device *iss;
+
+	unsigned int capture_mem;
+	unsigned int bpl_alignment;	/* alignment value */
+	unsigned int bpl_zero_padding;	/* whether the alignment is optional */
+	unsigned int bpl_max;		/* maximum bytes per line value */
+	unsigned int bpl_value;		/* bytes per line value */
+	unsigned int bpl_padding;	/* padding at end of line */
+
+	/* Entity video node streaming */
+	unsigned int streaming:1;
+
+	/* Pipeline state */
+	struct iss_pipeline pipe;
+	struct mutex stream_lock;	/* pipeline and stream states */
+
+	/* Video buffers queue */
+	struct vb2_queue *queue;
+	spinlock_t qlock;	/* Spinlock for dmaqueue */
+	struct list_head dmaqueue;
+	enum iss_video_dmaqueue_flags dmaqueue_flags;
+	struct vb2_alloc_ctx *alloc_ctx;
+
+	const struct iss_video_operations *ops;
+};
+
+#define to_iss_video(vdev)	container_of(vdev, struct iss_video, video)
+
+struct iss_video_fh {
+	struct v4l2_fh vfh;
+	struct iss_video *video;
+	struct vb2_queue queue;
+	struct v4l2_format format;
+	struct v4l2_fract timeperframe;
+};
+
+#define to_iss_video_fh(fh)	container_of(fh, struct iss_video_fh, vfh)
+#define iss_video_queue_to_iss_video_fh(q) \
+				container_of(q, struct iss_video_fh, queue)
+
+int omap4iss_video_init(struct iss_video *video, const char *name);
+void omap4iss_video_cleanup(struct iss_video *video);
+int omap4iss_video_register(struct iss_video *video,
+			    struct v4l2_device *vdev);
+void omap4iss_video_unregister(struct iss_video *video);
+struct iss_buffer *omap4iss_video_buffer_next(struct iss_video *video);
+struct media_pad *omap4iss_video_remote_pad(struct iss_video *video);
+
+const struct iss_format_info *
+omap4iss_video_format_info(enum v4l2_mbus_pixelcode code);
+
+#endif /* OMAP4_ISS_VIDEO_H */