Re: [PATCH RFC 1/2] media: V3s: Add support for Allwinner CSI.

From: Hans Verkuil
Date: Mon Jul 03 2017 - 06:20:43 EST

Hi Yong Deng,

Thanks for contributing this driver!

First a high-level comment: you need to rebase this to the latest media_tree
master branch (https://git.linuxtv.org/media_tree.git/) since v4l2-of.h has
been replaced by v4l2-fwnode.h. So this driver will not apply as-is.

Also missing is a patch adding a new entry to the MAINTAINERS file.

I have some more comments below:

On 06/27/2017 01:07 PM, Yong Deng wrote:
Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
and CSI1 is used for parallel interface. This is not documented in
datatsheet but by testing and guess.

datatsheet -> datasheet


This patch implement a v4l2 framework driver for it.

Currently, the driver only support the parallel interface. MIPI-CSI2,
ISP's support are not included in this patch.

Signed-off-by: Yong Deng <yong.deng@xxxxxxxxxxxx>
---
drivers/media/platform/Kconfig | 1 +
drivers/media/platform/Makefile | 2 +
drivers/media/platform/sunxi-csi/Kconfig | 8 +
drivers/media/platform/sunxi-csi/Makefile | 3 +
drivers/media/platform/sunxi-csi/sunxi_csi.c | 535 +++++++++++++++
drivers/media/platform/sunxi-csi/sunxi_csi.h | 203 ++++++
drivers/media/platform/sunxi-csi/sunxi_csi_v3s.c | 827 +++++++++++++++++++++++
drivers/media/platform/sunxi-csi/sunxi_csi_v3s.h | 206 ++++++
drivers/media/platform/sunxi-csi/sunxi_video.c | 667 ++++++++++++++++++
drivers/media/platform/sunxi-csi/sunxi_video.h | 61 ++
10 files changed, 2513 insertions(+)
create mode 100644 drivers/media/platform/sunxi-csi/Kconfig
create mode 100644 drivers/media/platform/sunxi-csi/Makefile
create mode 100644 drivers/media/platform/sunxi-csi/sunxi_csi.c
create mode 100644 drivers/media/platform/sunxi-csi/sunxi_csi.h
create mode 100644 drivers/media/platform/sunxi-csi/sunxi_csi_v3s.c
create mode 100644 drivers/media/platform/sunxi-csi/sunxi_csi_v3s.h
create mode 100644 drivers/media/platform/sunxi-csi/sunxi_video.c
create mode 100644 drivers/media/platform/sunxi-csi/sunxi_video.h

<snip>

diff --git a/drivers/media/platform/sunxi-csi/Kconfig b/drivers/media/platform/sunxi-csi/Kconfig
new file mode 100644
index 0000000..f26592a
--- /dev/null
+++ b/drivers/media/platform/sunxi-csi/Kconfig
@@ -0,0 +1,8 @@
+config VIDEO_SUNXI_CSI
+ tristate "Allwinner Camera Sensor Interface driver"
+ depends on VIDEO_V4L2 && COMMON_CLK && VIDEO_V4L2_SUBDEV_API && HAS_DMA
+ depends on ARCH_SUNXI

If possible change this to:

depends on ARCH_SUNXI || COMPILE_TEST

to allow this driver to be compiled on e.g. Intel for compile testing.

+ select VIDEOBUF2_DMA_CONTIG
+ select REGMAP_MMIO
+ ---help---
+ Support for the Allwinner Camera Sensor Interface Controller.

This controller is the same for all Allwinner SoC models?

<snip>

diff --git a/drivers/media/platform/sunxi-csi/sunxi_video.c b/drivers/media/platform/sunxi-csi/sunxi_video.c
new file mode 100644
index 0000000..57d7563
--- /dev/null
+++ b/drivers/media/platform/sunxi-csi/sunxi_video.c
@@ -0,0 +1,667 @@
+/*
+ * Copyright (c) 2017 Magewell Electronics Co., Ltd. (Nanjing).
+ * All rights reserved.
+ * Author: Yong Deng <yong.deng@xxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/of.h>
+
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-mc.h>
+#include <media/videobuf2-dma-contig.h>
+#include <media/videobuf2-v4l2.h>
+
+#include "sunxi_csi.h"
+#include "sunxi_video.h"
+
+struct sunxi_csi_buffer {
+ struct vb2_v4l2_buffer vb;
+ struct list_head list;
+
+ dma_addr_t dma_addr;
+};
+
+static struct sunxi_csi_format *
+find_format_by_fourcc(struct sunxi_video *video, unsigned int fourcc)
+{
+ unsigned int num_formats = video->num_formats;
+ struct sunxi_csi_format *fmt;
+ unsigned int i;
+
+ for (i = 0; i < num_formats; i++) {
+ fmt = &video->formats[i];
+ if (fmt->fourcc == fourcc)
+ return fmt;
+ }
+
+ return NULL;
+}
+
+static struct v4l2_subdev *
+sunxi_video_remote_subdev(struct sunxi_video *video, u32 *pad)
+{
+ struct media_pad *remote;
+
+ remote = media_entity_remote_pad(&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);
+}
+
+static int sunxi_video_queue_setup(struct vb2_queue *vq,
+ unsigned int *nbuffers, unsigned int *nplanes,
+ unsigned int sizes[],
+ struct device *alloc_devs[])
+{
+ struct sunxi_video *video = vb2_get_drv_priv(vq);
+ unsigned int size = video->fmt.fmt.pix.sizeimage;
+
+ if (*nplanes)
+ return sizes[0] < size ? -EINVAL : 0;
+
+ *nplanes = 1;
+ sizes[0] = size;
+
+ return 0;
+}
+
+static int sunxi_video_buffer_prepare(struct vb2_buffer *vb)
+{
+ struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+ struct sunxi_csi_buffer *buf =
+ container_of(vbuf, struct sunxi_csi_buffer, vb);
+ struct sunxi_video *video = vb2_get_drv_priv(vb->vb2_queue);
+ unsigned long size = video->fmt.fmt.pix.sizeimage;
+
+ if (vb2_plane_size(vb, 0) < size) {
+ v4l2_err(video->vdev.v4l2_dev, "buffer too small (%lu < %lu)\n",
+ vb2_plane_size(vb, 0), size);
+ return -EINVAL;
+ }
+
+ vb2_set_plane_payload(vb, 0, size);
+
+ buf->dma_addr = vb2_dma_contig_plane_dma_addr(vb, 0);
+
+ vbuf->field = video->fmt.fmt.pix.field;
+
+ return 0;
+}
+
+static int sunxi_pipeline_set_stream(struct sunxi_video *video, bool enable)
+{
+ struct media_entity *entity;
+ struct media_pad *pad;
+ struct v4l2_subdev *subdev;
+ int ret;
+
+ entity = &video->vdev.entity;
+ while (1) {
+ pad = &entity->pads[0];
+ if (!(pad->flags & MEDIA_PAD_FL_SINK))
+ break;
+
+ pad = media_entity_remote_pad(pad);
+ if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
+ break;
+
+ entity = pad->entity;
+ subdev = media_entity_to_v4l2_subdev(entity);
+
+ ret = v4l2_subdev_call(subdev, video, s_stream, enable);
+ if (enable && ret < 0 && ret != -ENOIOCTLCMD)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int sunxi_video_start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+ struct sunxi_video *video = vb2_get_drv_priv(vq);
+ struct sunxi_csi_buffer *buf;
+ struct sunxi_csi_config config;
+ unsigned long flags;
+ int ret;
+
+ video->sequence = 0;
+
+ ret = media_pipeline_start(&video->vdev.entity, &video->vdev.pipe);
+ if (ret < 0)
+ goto err_start_pipeline;
+
+ ret = sunxi_pipeline_set_stream(video, true);
+ if (ret < 0)
+ goto err_start_stream;
+
+ config.pixelformat = video->fmt.fmt.pix.pixelformat;
+ config.code = video->current_fmt->mbus_code;
+ config.field = video->fmt.fmt.pix.field;
+ config.width = video->fmt.fmt.pix.width;
+ config.height = video->fmt.fmt.pix.height;
+
+ ret = sunxi_csi_update_config(video->csi, &config);
+ if (ret < 0)
+ goto err_update_config;
+
+ spin_lock_irqsave(&video->dma_queue_lock, flags);
+ video->cur_frm = list_first_entry(&video->dma_queue,
+ struct sunxi_csi_buffer, list);
+ list_del(&video->cur_frm->list);
+ spin_unlock_irqrestore(&video->dma_queue_lock, flags);
+
+ ret = sunxi_csi_update_buf_addr(video->csi, video->cur_frm->dma_addr);
+ if (ret < 0)
+ goto err_update_addr;
+
+ ret = sunxi_csi_set_stream(video->csi, true);
+ if (ret < 0)
+ goto err_csi_stream;
+
+ return 0;
+
+err_csi_stream:
+err_update_addr:
+err_update_config:
+ sunxi_pipeline_set_stream(video, false);
+err_start_stream:
+ media_pipeline_stop(&video->vdev.entity);
+err_start_pipeline:
+ spin_lock_irqsave(&video->dma_queue_lock, flags);
+ list_for_each_entry(buf, &video->dma_queue, list)
+ vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
+ INIT_LIST_HEAD(&video->dma_queue);
+ spin_unlock_irqrestore(&video->dma_queue_lock, flags);
+
+ return ret;
+}
+
+static void sunxi_video_stop_streaming(struct vb2_queue *vq)
+{
+ struct sunxi_video *video = vb2_get_drv_priv(vq);
+ unsigned long flags;
+ struct sunxi_csi_buffer *buf;
+
+ sunxi_pipeline_set_stream(video, false);
+
+ sunxi_csi_set_stream(video->csi, false);
+
+ media_pipeline_stop(&video->vdev.entity);
+
+ /* Release all active buffers */
+ spin_lock_irqsave(&video->dma_queue_lock, flags);
+ if (unlikely(video->cur_frm)) {
+ vb2_buffer_done(&video->cur_frm->vb.vb2_buf,
+ VB2_BUF_STATE_ERROR);
+ video->cur_frm = NULL;
+ }
+ list_for_each_entry(buf, &video->dma_queue, list)
+ vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+ INIT_LIST_HEAD(&video->dma_queue);
+ spin_unlock_irqrestore(&video->dma_queue_lock, flags);
+}
+
+static void sunxi_video_buffer_queue(struct vb2_buffer *vb)
+{
+ struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+ struct sunxi_csi_buffer *buf =
+ container_of(vbuf, struct sunxi_csi_buffer, vb);
+ struct sunxi_video *video = vb2_get_drv_priv(vb->vb2_queue);
+ unsigned long flags;
+
+ spin_lock_irqsave(&video->dma_queue_lock, flags);
+ if (!video->cur_frm && list_empty(&video->dma_queue) &&
+ vb2_is_streaming(vb->vb2_queue)) {
+ video->cur_frm = buf;
+ sunxi_csi_update_buf_addr(video->csi, video->cur_frm->dma_addr);
+ sunxi_csi_set_stream(video->csi, 1);
+ } else
+ list_add_tail(&buf->list, &video->dma_queue);
+ spin_unlock_irqrestore(&video->dma_queue_lock, flags);
+}
+
+void sunxi_video_frame_done(struct sunxi_video *video)
+{
+ spin_lock(&video->dma_queue_lock);
+
+ if (video->cur_frm) {
+ struct vb2_v4l2_buffer *vbuf = &video->cur_frm->vb;
+ struct vb2_buffer *vb = &vbuf->vb2_buf;
+
+ vb->timestamp = ktime_get_ns();
+ vbuf->sequence = video->sequence++;
+ vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
+ video->cur_frm = NULL;
+ }
+
+ if (!list_empty(&video->dma_queue)
+ && vb2_is_streaming(&video->vb2_vidq)) {
+ video->cur_frm = list_first_entry(&video->dma_queue,
+ struct sunxi_csi_buffer, list);
+ list_del(&video->cur_frm->list);
+ sunxi_csi_update_buf_addr(video->csi, video->cur_frm->dma_addr);
+ } else
+ sunxi_csi_set_stream(video->csi, 0);
+
+ spin_unlock(&video->dma_queue_lock);
+}
+
+static struct vb2_ops sunxi_csi_vb2_ops = {
+ .queue_setup = sunxi_video_queue_setup,
+ .wait_prepare = vb2_ops_wait_prepare,
+ .wait_finish = vb2_ops_wait_finish,
+ .buf_prepare = sunxi_video_buffer_prepare,
+ .start_streaming = sunxi_video_start_streaming,
+ .stop_streaming = sunxi_video_stop_streaming,
+ .buf_queue = sunxi_video_buffer_queue,
+};
+
+static int vidioc_querycap(struct file *file, void *priv,
+ struct v4l2_capability *cap)
+{
+ struct sunxi_video *video = video_drvdata(file);
+
+ strlcpy(cap->driver, "sunxi-video", sizeof(cap->driver));
+ strlcpy(cap->card, video->vdev.name, sizeof(cap->card));
+ snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
+ video->csi->dev->of_node->name);
+
+ cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
+ cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;

Drop these two lines. You already set device_caps in the video_device struct,
and the V4L2 core will fill in these two v4l2_capability fields based on that.

+
+ return 0;
+}
+
+static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_fmtdesc *f)
+{
+ struct sunxi_video *video = video_drvdata(file);
+ u32 index = f->index;
+
+ if (index >= video->num_formats)
+ return -EINVAL;
+
+ f->pixelformat = video->formats[index].fourcc;
+
+ return 0;
+}
+
+static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *fmt)
+{
+ struct sunxi_video *video = video_drvdata(file);
+
+ *fmt = video->fmt;
+
+ return 0;
+}
+
+static int sunxi_video_try_fmt(struct sunxi_video *video, struct v4l2_format *f,
+ struct sunxi_csi_format **current_fmt)
+{
+ struct sunxi_csi_format *csi_fmt;
+ struct v4l2_pix_format *pixfmt = &f->fmt.pix;
+ struct v4l2_subdev_format format;
+ struct v4l2_subdev *subdev;
+ u32 pad;
+ int ret;
+
+ if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ return -EINVAL;

Drop this test. It's not needed.

+
+ subdev = sunxi_video_remote_subdev(video, &pad);
+ if (subdev == NULL)
+ return -ENXIO;
+
+ csi_fmt = find_format_by_fourcc(video, pixfmt->pixelformat);
+ if (csi_fmt == NULL)
+ return -EINVAL;
+
+ format.pad = pad;
+ format.which = V4L2_SUBDEV_FORMAT_TRY;
+ v4l2_fill_mbus_format(&format.format, pixfmt, csi_fmt->mbus_code);
+ ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &format);
+ if (ret)
+ return ret == -ENOIOCTLCMD ? -ENOTTY : ret;

Just do 'return ret'.

+
+ v4l2_fill_pix_format(pixfmt, &format.format);
+
+ pixfmt->bytesperline = (pixfmt->width * csi_fmt->bpp) >> 3;
+ pixfmt->sizeimage = (pixfmt->width * csi_fmt->bpp * pixfmt->height) / 8;
+
+ if (current_fmt)
+ *current_fmt = csi_fmt;
+
+ return 0;
+}
+
+static int sunxi_video_set_fmt(struct sunxi_video *video, struct v4l2_format *f)
+{
+ struct v4l2_subdev_format format;
+ struct sunxi_csi_format *current_fmt;
+ struct v4l2_subdev *subdev;
+ u32 pad;
+ int ret;
+
+ subdev = sunxi_video_remote_subdev(video, &pad);
+ if (subdev == NULL)
+ return -ENXIO;
+
+ ret = sunxi_video_try_fmt(video, f, &current_fmt);
+ if (ret)
+ return ret;
+
+ format.which = V4L2_SUBDEV_FORMAT_ACTIVE;
+ v4l2_fill_mbus_format(&format.format, &f->fmt.pix,
+ current_fmt->mbus_code);
+ ret = v4l2_subdev_call(subdev, pad, set_fmt, NULL, &format);
+ if (ret < 0)
+ return ret;
+
+ video->fmt = *f;
+ video->current_fmt = current_fmt;
+
+ return 0;
+}
+
+static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct sunxi_video *video = video_drvdata(file);
+
+ if (vb2_is_streaming(&video->vb2_vidq))
+ return -EBUSY;
+
+ return sunxi_video_set_fmt(video, f);
+}
+
+static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct sunxi_video *video = video_drvdata(file);
+
+ return sunxi_video_try_fmt(video, f, NULL);
+}
+
+static const struct v4l2_ioctl_ops sunxi_video_ioctl_ops = {
+ .vidioc_querycap = vidioc_querycap,
+ .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
+ .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
+ .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
+ .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
+
+ .vidioc_reqbufs = vb2_ioctl_reqbufs,
+ .vidioc_querybuf = vb2_ioctl_querybuf,
+ .vidioc_qbuf = vb2_ioctl_qbuf,
+ .vidioc_expbuf = vb2_ioctl_expbuf,
+ .vidioc_dqbuf = vb2_ioctl_dqbuf,
+ .vidioc_create_bufs = vb2_ioctl_create_bufs,
+ .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
+ .vidioc_streamon = vb2_ioctl_streamon,
+ .vidioc_streamoff = vb2_ioctl_streamoff,
+};
+
+/* -----------------------------------------------------------------------------
+ * V4L2 file operations
+ */
+static int sunxi_video_open(struct file *file)
+{
+ struct sunxi_video *video = video_drvdata(file);
+ struct v4l2_format format;
+ int ret;
+
+ if (mutex_lock_interruptible(&video->lock))
+ return -ERESTARTSYS;
+
+ ret = v4l2_fh_open(file);
+ if (ret < 0)
+ goto unlock;
+
+ ret = v4l2_pipeline_pm_use(&video->vdev.entity, 1);
+ if (ret < 0)
+ goto fh_release;
+
+ if (!v4l2_fh_is_singular_file(file))
+ goto unlock;
+
+ ret = sunxi_csi_set_power(video->csi, true);
+ if (ret < 0)
+ goto fh_release;
+
+ /* setup default format */
+ if (video->num_formats > 0) {
+ format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ format.fmt.pix.width = 1280;
+ format.fmt.pix.height = 720;
+ format.fmt.pix.pixelformat = video->formats[0].fourcc;
+ sunxi_video_set_fmt(video, &format);
+ }
+
+ mutex_unlock(&video->lock);
+ return 0;
+
+fh_release:
+ v4l2_fh_release(file);
+unlock:
+ mutex_unlock(&video->lock);
+ return ret;
+}
+
+static int sunxi_video_close(struct file *file)
+{
+ struct sunxi_video *video = video_drvdata(file);
+
+ mutex_lock(&video->lock);
+
+ _vb2_fop_release(file, NULL);
+
+ v4l2_pipeline_pm_use(&video->vdev.entity, 0);
+
+ if (v4l2_fh_is_singular_file(file))

This is the wrong order. You need to check this before _vb2_fop_release is called.

E.g.:

bool last_fh = v4l2_fh_is_singular_file(file);

_vb2_fop_release(file, NULL);
...
if (last_fh)
sunxi_csi_set_power(video->csi, false);

+ sunxi_csi_set_power(video->csi, false);
+
+ mutex_unlock(&video->lock);
+
+ return 0;
+}
+
+static const struct v4l2_file_operations sunxi_video_fops = {
+ .owner = THIS_MODULE,
+ .open = sunxi_video_open,
+ .release = sunxi_video_close,
+ .unlocked_ioctl = video_ioctl2,
+ .read = vb2_fop_read,

You haven't signalled read() support in the capabilities or in the vb2 io_modes, so
either drop this from the video_fops, or add it to the device_caps and io_modes fields.

+ .mmap = vb2_fop_mmap,
+ .poll = vb2_fop_poll
+};
+
+/* -----------------------------------------------------------------------------
+ * Media Operations
+ */
+static int sunxi_video_formats_init(struct sunxi_video *video)
+{
+ struct v4l2_subdev_mbus_code_enum mbus_code = { 0 };
+ struct sunxi_csi *csi = video->csi;
+ struct v4l2_subdev *subdev;
+ u32 pad;
+ const u32 *pixformats;
+ int pixformat_count = 0;
+ u32 subdev_codes[32]; /* subdev format codes, 32 should be enough */
+ int codes_count = 0;
+ int num_fmts = 0;
+ int i, j;
+
+ subdev = sunxi_video_remote_subdev(video, &pad);
+ if (subdev == NULL)
+ return -ENXIO;
+
+ /* Get supported pixformats of CSI */
+ pixformat_count = sunxi_csi_get_supported_pixformats(csi, &pixformats);
+ if (pixformat_count <= 0)
+ return -ENXIO;
+
+ /* Get subdev formats codes */
+ mbus_code.pad = pad;
+ mbus_code.which = V4L2_SUBDEV_FORMAT_ACTIVE;
+ while (!v4l2_subdev_call(subdev, pad, enum_mbus_code, NULL,
+ &mbus_code)) {
+ subdev_codes[codes_count] = mbus_code.code;
+ codes_count++;
+ mbus_code.index++;
+ }
+
+ if (!codes_count)
+ return -ENXIO;
+
+ /* Get supported formats count */
+ for (i = 0; i < codes_count; i++) {
+ for (j = 0; j < pixformat_count; j++) {
+ if (!sunxi_csi_is_format_support(csi, pixformats[j],
+ mbus_code.code)) {
+ continue;
+ }
+ num_fmts++;
+ }
+ }
+
+ if (!num_fmts)
+ return -ENXIO;
+
+ video->num_formats = num_fmts;
+ video->formats = devm_kcalloc(video->csi->dev, num_fmts,
+ sizeof(struct sunxi_csi_format), GFP_KERNEL);
+ if (!video->formats) {
+ dev_err(video->csi->dev, "could not allocate memory\n");
+ return -ENOMEM;
+ }
+
+ /* Get supported formats */
+ num_fmts = 0;
+ for (i = 0; i < codes_count; i++) {
+ for (j = 0; j < pixformat_count; j++) {
+ if (!sunxi_csi_is_format_support(csi, pixformats[j],
+ mbus_code.code)) {
+ continue;
+ }
+
+ video->formats[num_fmts].fourcc = pixformats[j];
+ video->formats[num_fmts].mbus_code =
+ mbus_code.code;
+ video->formats[num_fmts].bpp =
+ v4l2_pixformat_get_bpp(pixformats[j]);
+ num_fmts++;
+ }
+ }
+
+ return 0;
+}
+
+static int sunxi_video_link_setup(struct media_entity *entity,
+ const struct media_pad *local,
+ const struct media_pad *remote, u32 flags)
+{
+ struct video_device *vdev = media_entity_to_video_device(entity);
+ struct sunxi_video *video = video_get_drvdata(vdev);
+
+ if (WARN_ON(video == NULL))
+ return 0;
+
+ return sunxi_video_formats_init(video);
+}
+
+static const struct media_entity_operations sunxi_video_media_ops = {
+ .link_setup = sunxi_video_link_setup,
+};
+
+int sunxi_video_init(struct sunxi_video *video, struct sunxi_csi *csi,
+ const char *name)
+{
+ struct video_device *vdev = &video->vdev;
+ struct vb2_queue *vidq = &video->vb2_vidq;
+ int ret;
+
+ video->csi = csi;
+
+ /* Initialize the media entity... */
+ video->pad.flags = MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
+ vdev->entity.ops = &sunxi_video_media_ops;
+ ret = media_entity_pads_init(&vdev->entity, 1, &video->pad);
+ if (ret < 0)
+ return ret;
+
+ mutex_init(&video->lock);
+
+ INIT_LIST_HEAD(&video->dma_queue);
+ spin_lock_init(&video->dma_queue_lock);
+
+ video->cur_frm = NULL;
+ video->sequence = 0;
+ video->num_formats = 0;
+
+ /* Initialize videobuf2 queue */
+ vidq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ vidq->io_modes = VB2_MMAP | VB2_DMABUF;
+ vidq->drv_priv = video;
+ vidq->buf_struct_size = sizeof(struct sunxi_csi_buffer);
+ vidq->ops = &sunxi_csi_vb2_ops;
+ vidq->mem_ops = &vb2_dma_contig_memops;
+ vidq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+ vidq->lock = &video->lock;
+ vidq->min_buffers_needed = 1;
+ vidq->dev = csi->dev;
+
+ ret = vb2_queue_init(vidq);
+ if (ret) {
+ v4l2_err(&csi->v4l2_dev, "vb2_queue_init failed: %d\n", ret);
+ goto error;
+ }
+
+ /* Register video device */
+ strlcpy(vdev->name, name, sizeof(vdev->name));
+ vdev->release = video_device_release_empty;
+ vdev->fops = &sunxi_video_fops;
+ vdev->ioctl_ops = &sunxi_video_ioctl_ops;
+ vdev->vfl_type = VFL_TYPE_GRABBER;
+ vdev->vfl_dir = VFL_DIR_RX;
+ vdev->v4l2_dev = &csi->v4l2_dev;
+ vdev->queue = vidq;
+ vdev->lock = &video->lock;
+ vdev->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_CAPTURE;
+ video_set_drvdata(vdev, video);
+
+ ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
+ if (ret < 0) {
+ v4l2_err(&csi->v4l2_dev,
+ "video_register_device failed: %d\n", ret);
+ goto error;
+ }
+
+ return 0;
+
+error:
+ sunxi_video_cleanup(video);
+ return ret;
+}
+
+void sunxi_video_cleanup(struct sunxi_video *video)
+{
+ if (video_is_registered(&video->vdev))
+ video_unregister_device(&video->vdev);
+
+ media_entity_cleanup(&video->vdev.entity);
+}

<snip>

Regards,

Hans