On 10/03/2013 01:55 AM, Laurent Pinchart wrote:
> From: Sergio Aguirre <sergio.a.aguirre@xxxxxxxxx>
>
> 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@xxxxxxxxx>
>
> [Port the driver to v3.12-rc3, including the following changes
> - Don't include plat/ headers
> - Don't use cpu_is_omap44xx() macro
> - Don't depend on EXPERIMENTAL
> - Fix s_crop operation prototype
> - Update link_notify prototype
> - Rename media_entity_remote_source to media_entity_remote_pad]
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> ---
> drivers/staging/media/omap4iss/iss_video.c | 1129 ++++++++++++++++++++++++++++
> drivers/staging/media/omap4iss/iss_video.h | 201 +++++
> 2 files changed, 1330 insertions(+)
> create mode 100644 drivers/staging/media/omap4iss/iss_video.c
> create mode 100644 drivers/staging/media/omap4iss/iss_video.h
>
> diff --git a/drivers/staging/media/omap4iss/iss_video.c b/drivers/staging/media/omap4iss/iss_video.c
> new file mode 100644
> index 0000000..31f1b88
> --- /dev/null
> +++ b/drivers/staging/media/omap4iss/iss_video.c
<snip>
> +/* -----------------------------------------------------------------------------
> + * 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;
Set device_caps instead of capabilities and add:
cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
> +
> + 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;
Return ENOTTY instead of EINVAL. Even better, use v4l2_subdev_has_op() + v4l2_disable_ioctl()
to just disable ioctls based on the available subdev ops in probe().
> +
> + 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;
No necessary, vb2_is_streaming already keeps track of that.
> +
> + 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;
> +}
Also add s_input.
> +
> +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);
I'm missing q->timestamp_type.
> +
> + 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))
No need to call video_is_registered(), that's already done by video_unregister_device().
> + video_unregister_device(&video->video);
> +}
> diff --git a/drivers/staging/media/omap4iss/iss_video.h b/drivers/staging/media/omap4iss/iss_video.h
> new file mode 100644
> index 0000000..8cf1b35
> --- /dev/null
> +++ b/drivers/staging/media/omap4iss/iss_video.h
> @@ -0,0 +1,201 @@
> +/*
> + * TI OMAP4 ISS V4L2 Driver - Generic video node
> + *
> + * Copyright (C) 2012 Texas Instruments, Inc.
> + *
> + * Author: Sergio Aguirre <sergio.a.aguirre@xxxxxxxxx>
> + *
> + * 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 */
>
Regards,
Hans
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