Message-ID: <b7456d40-040d-41b7-45bc-ef6709ab7933@xs4all.nl>
Date:   Fri, 20 Jan 2017 15:38:28 +0100
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Steve Longerbeam <slongerbeam@...il.com>, robh+dt@...nel.org,
        mark.rutland@....com, shawnguo@...nel.org, kernel@...gutronix.de,
        fabio.estevam@....com, linux@...linux.org.uk, mchehab@...nel.org,
        nick@...anahar.org, markus.heiser@...marIT.de,
        p.zabel@...gutronix.de, laurent.pinchart+renesas@...asonboard.com,
        bparrot@...com, geert@...ux-m68k.org, arnd@...db.de,
        sudipm.mukherjee@...il.com, minghsiu.tsai@...iatek.com,
        tiffany.lin@...iatek.com, jean-christophe.trotin@...com,
        horms+renesas@...ge.net.au, niklas.soderlund+renesas@...natech.se,
        robert.jarzmik@...e.fr, songjun.wu@...rochip.com,
        andrew-ct.chen@...iatek.com, gregkh@...uxfoundation.org
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        devel@...verdev.osuosl.org,
        Steve Longerbeam <steve_longerbeam@...tor.com>
Subject: Re: [PATCH v3 20/24] media: imx: Add Camera Interface subdev driver

On 01/07/2017 03:11 AM, Steve Longerbeam wrote:
> This is the camera interface driver that provides the v4l2
> user interface. Frames can be received from various sources:
> 
> - directly from SMFC for capturing unconverted images directly from
>   camera sensors.
> 
> - from the IC pre-process encode task.
> 
> - from the IC pre-process viewfinder task.
> 
> - from the IC post-process task.
> 
> Signed-off-by: Steve Longerbeam <steve_longerbeam@...tor.com>
> ---
>  drivers/staging/media/imx/Makefile    |    2 +-
>  drivers/staging/media/imx/imx-camif.c | 1000 +++++++++++++++++++++++++++++++++
>  2 files changed, 1001 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/staging/media/imx/imx-camif.c
> 
> diff --git a/drivers/staging/media/imx/Makefile b/drivers/staging/media/imx/Makefile
> index d2a962c..fe9e992 100644
> --- a/drivers/staging/media/imx/Makefile
> +++ b/drivers/staging/media/imx/Makefile
> @@ -8,4 +8,4 @@ obj-$(CONFIG_VIDEO_IMX_MEDIA) += imx-ic.o
>  
>  obj-$(CONFIG_VIDEO_IMX_CAMERA) += imx-csi.o
>  obj-$(CONFIG_VIDEO_IMX_CAMERA) += imx-smfc.o
> -
> +obj-$(CONFIG_VIDEO_IMX_CAMERA) += imx-camif.o
> diff --git a/drivers/staging/media/imx/imx-camif.c b/drivers/staging/media/imx/imx-camif.c
> new file mode 100644
> index 0000000..404f724
> --- /dev/null
> +++ b/drivers/staging/media/imx/imx-camif.c
> @@ -0,0 +1,1000 @@
> +/*
> + * Video Camera Capture Subdev for Freescale i.MX5/6 SOC
> + *
> + * Copyright (c) 2012-2016 Mentor Graphics Inc.
> + *
> + * 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 <linux/delay.h>
> +#include <linux/fs.h>
> +#include <linux/module.h>
> +#include <linux/of_platform.h>
> +#include <linux/pinctrl/consumer.h>
> +#include <linux/platform_device.h>
> +#include <linux/sched.h>
> +#include <linux/slab.h>
> +#include <linux/spinlock.h>
> +#include <linux/timer.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/v4l2-of.h>
> +#include <media/v4l2-subdev.h>
> +#include <media/videobuf2-dma-contig.h>
> +#include <video/imx-ipu-v3.h>
> +#include <media/imx.h>
> +#include "imx-media.h"
> +
> +#define CAMIF_NUM_PADS 2
> +
> +struct camif_priv {
> +	struct device         *dev;
> +	struct video_device    vfd;
> +	struct media_pipeline  mp;
> +	struct imx_media_dev  *md;
> +	struct v4l2_subdev     sd;
> +	struct media_pad       pad[CAMIF_NUM_PADS];
> +	struct media_pad       vd_pad;
> +	int id;
> +	int input_pad;
> +	int output_pad;
> +
> +	struct v4l2_mbus_framefmt format_mbus[CAMIF_NUM_PADS];
> +	const struct imx_media_pixfmt *cc[CAMIF_NUM_PADS];
> +
> +	/* dma buffer ring */
> +	struct imx_media_dma_buf_ring *in_ring;
> +	struct v4l2_subdev     *src_sd;
> +
> +	struct mutex           mutex;       /* capture device mutex */
> +	spinlock_t             q_lock;      /* protect ready_q */
> +
> +	/* buffer queue used in videobuf2 */
> +	struct vb2_queue       buffer_queue;
> +
> +	/* streaming buffer queue */
> +	struct list_head       ready_q;
> +
> +	/* controls inherited from subdevs */
> +	struct v4l2_ctrl_handler ctrl_hdlr;
> +
> +	/* misc status */
> +	int                    current_input; /* the current input */
> +	v4l2_std_id            current_std;   /* current standard */
> +	bool                   stop;          /* streaming is stopping */
> +};
> +
> +/* In bytes, per queue */
> +#define VID_MEM_LIMIT	SZ_64M
> +
> +static struct vb2_ops camif_qops;
> +
> +/*
> + * Video ioctls follow
> + */
> +
> +static int vidioc_querycap(struct file *file, void *fh,
> +			   struct v4l2_capability *cap)
> +{
> +	strncpy(cap->driver, "imx-media-camif", sizeof(cap->driver) - 1);
> +	strncpy(cap->card, "imx-media-camif", sizeof(cap->card) - 1);
> +	cap->bus_info[0] = 0;

Should be set to something like 'platform:imx-media-camif'. v4l2-compliance should
complain about this.

> +	cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
> +	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;

Set device_caps in struct video_device, then drop these two lines since
the core will set these up based on the device_caps field in struct video_device.

> +
> +	return 0;
> +}
> +
> +static int camif_enum_fmt_vid_cap(struct file *file, void *fh,
> +				  struct v4l2_fmtdesc *f)
> +{
> +	const struct imx_media_pixfmt *cc;
> +	u32 code;
> +	int ret;
> +
> +	ret = imx_media_enum_format(&code, f->index, true, true);
> +	if (ret)
> +		return ret;
> +	cc = imx_media_find_format(0, code, true, true);
> +	if (!cc)
> +		return -EINVAL;
> +
> +	f->pixelformat = cc->fourcc;
> +
> +	return 0;
> +}
> +
> +static int camif_g_fmt_vid_cap(struct file *file, void *fh,
> +			       struct v4l2_format *f)
> +{
> +	struct camif_priv *priv = video_drvdata(file);
> +	struct v4l2_mbus_framefmt *outfmt;
> +
> +	/* user format is the same as the format from output pad */
> +	outfmt = &priv->format_mbus[priv->output_pad];
> +	return imx_media_mbus_fmt_to_pix_fmt(&f->fmt.pix, outfmt);
> +}
> +
> +static int camif_try_fmt_vid_cap(struct file *file, void *fh,
> +				 struct v4l2_format *f)
> +{
> +	return camif_g_fmt_vid_cap(file, fh, f);
> +}
> +
> +static int camif_s_fmt_vid_cap(struct file *file, void *fh,
> +			       struct v4l2_format *f)
> +{
> +	struct camif_priv *priv = video_drvdata(file);
> +
> +	if (vb2_is_busy(&priv->buffer_queue)) {
> +		v4l2_err(&priv->sd, "%s queue busy\n", __func__);
> +		return -EBUSY;
> +	}
> +
> +	return camif_try_fmt_vid_cap(file, priv, f);
> +}
> +
> +static int camif_querystd(struct file *file, void *fh, v4l2_std_id *std)
> +{
> +	struct camif_priv *priv = video_drvdata(file);
> +	struct imx_media_subdev *sensor;
> +
> +	sensor = imx_media_find_sensor(priv->md, &priv->sd.entity);
> +	if (IS_ERR(sensor)) {
> +		v4l2_err(&priv->sd, "no sensor attached\n");
> +		return PTR_ERR(sensor);
> +	}
> +
> +	return v4l2_subdev_call(sensor->sd, video, querystd, std);
> +}
> +
> +static int camif_g_std(struct file *file, void *fh, v4l2_std_id *std)
> +{
> +	struct camif_priv *priv = video_drvdata(file);
> +
> +	*std = priv->current_std;
> +	return 0;
> +}
> +
> +static int camif_s_std(struct file *file, void *fh, v4l2_std_id std)
> +{
> +	struct camif_priv *priv = video_drvdata(file);
> +	struct imx_media_subdev *sensor;
> +	int ret;
> +
> +	sensor = imx_media_find_sensor(priv->md, &priv->sd.entity);
> +	if (IS_ERR(sensor)) {
> +		v4l2_err(&priv->sd, "no sensor attached\n");
> +		return PTR_ERR(sensor);
> +	}
> +
> +	if (vb2_is_busy(&priv->buffer_queue))
> +		return -EBUSY;
> +
> +	ret = v4l2_subdev_call(sensor->sd, video, s_std, std);
> +	if (ret < 0)
> +		return ret;
> +
> +	priv->current_std = std;
> +	return 0;
> +}
> +
> +static int camif_enum_input(struct file *file, void *fh,
> +			    struct v4l2_input *input)
> +{
> +	struct camif_priv *priv = video_drvdata(file);
> +	struct imx_media_subdev *sensor;
> +	int index = input->index;
> +
> +	sensor = imx_media_find_sensor(priv->md, &priv->sd.entity);
> +	if (IS_ERR(sensor)) {
> +		v4l2_err(&priv->sd, "no sensor attached\n");
> +		return PTR_ERR(sensor);
> +	}
> +
> +	if (index >= sensor->input.num)
> +		return -EINVAL;
> +
> +	input->type = V4L2_INPUT_TYPE_CAMERA;
> +	strncpy(input->name, sensor->input.name[index], sizeof(input->name));
> +
> +	if (index == priv->current_input) {
> +		v4l2_subdev_call(sensor->sd, video, g_input_status,
> +				 &input->status);
> +		v4l2_subdev_call(sensor->sd, video, querystd, &input->std);

Wrong op, use g_tvnorms instead.

> +	} else {
> +		input->status = V4L2_IN_ST_NO_SIGNAL;
> +		input->std = V4L2_STD_UNKNOWN;
> +	}
> +
> +	return 0;
> +}
> +
> +static int camif_g_input(struct file *file, void *fh, unsigned int *index)
> +{
> +	struct camif_priv *priv = video_drvdata(file);
> +
> +	*index = priv->current_input;
> +	return 0;
> +}
> +
> +static int camif_s_input(struct file *file, void *fh, unsigned int index)
> +{
> +	struct camif_priv *priv = video_drvdata(file);
> +	struct imx_media_subdev *sensor;
> +	int ret;
> +
> +	sensor = imx_media_find_sensor(priv->md, &priv->sd.entity);
> +	if (IS_ERR(sensor)) {
> +		v4l2_err(&priv->sd, "no sensor attached\n");
> +		return PTR_ERR(sensor);
> +	}
> +
> +	if (index >= sensor->input.num)
> +		return -EINVAL;
> +
> +	if (index == priv->current_input)
> +		return 0;
> +
> +	/* select the sensor's input */
> +	ret = v4l2_subdev_call(sensor->sd, video, s_routing,
> +			       sensor->input.value[index], 0, 0);
> +	if (!ret)
> +		priv->current_input = index;
> +
> +	return ret;
> +}
> +
> +static int camif_g_parm(struct file *file, void *fh,
> +			struct v4l2_streamparm *a)
> +{
> +	struct camif_priv *priv = video_drvdata(file);
> +	struct imx_media_subdev *sensor;
> +
> +	sensor = imx_media_find_sensor(priv->md, &priv->sd.entity);
> +	if (IS_ERR(sensor)) {
> +		v4l2_err(&priv->sd, "no sensor attached\n");
> +		return PTR_ERR(sensor);
> +	}
> +
> +	if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> +		return -EINVAL;
> +
> +	return v4l2_subdev_call(sensor->sd, video, g_parm, a);
> +}
> +
> +static int camif_s_parm(struct file *file, void *fh,
> +			struct v4l2_streamparm *a)
> +{
> +	struct camif_priv *priv = video_drvdata(file);
> +	struct imx_media_subdev *sensor;
> +
> +	sensor = imx_media_find_sensor(priv->md, &priv->sd.entity);
> +	if (IS_ERR(sensor)) {
> +		v4l2_err(&priv->sd, "no sensor attached\n");
> +		return PTR_ERR(sensor);
> +	}
> +
> +	if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> +		return -EINVAL;
> +
> +	return v4l2_subdev_call(sensor->sd, video, s_parm, a);
> +}
> +
> +static const struct v4l2_ioctl_ops camif_ioctl_ops = {
> +	.vidioc_querycap	= vidioc_querycap,
> +
> +	.vidioc_enum_fmt_vid_cap        = camif_enum_fmt_vid_cap,
> +	.vidioc_g_fmt_vid_cap           = camif_g_fmt_vid_cap,
> +	.vidioc_try_fmt_vid_cap         = camif_try_fmt_vid_cap,
> +	.vidioc_s_fmt_vid_cap           = camif_s_fmt_vid_cap,
> +
> +	.vidioc_querystd        = camif_querystd,
> +	.vidioc_g_std           = camif_g_std,
> +	.vidioc_s_std           = camif_s_std,
> +
> +	.vidioc_enum_input      = camif_enum_input,
> +	.vidioc_g_input         = camif_g_input,
> +	.vidioc_s_input         = camif_s_input,
> +
> +	.vidioc_g_parm          = camif_g_parm,
> +	.vidioc_s_parm          = camif_s_parm,
> +
> +	.vidioc_reqbufs		= vb2_ioctl_reqbufs,
> +	.vidioc_create_bufs     = vb2_ioctl_create_bufs,
> +	.vidioc_prepare_buf     = vb2_ioctl_prepare_buf,
> +	.vidioc_querybuf	= vb2_ioctl_querybuf,
> +	.vidioc_qbuf		= vb2_ioctl_qbuf,
> +	.vidioc_dqbuf		= vb2_ioctl_dqbuf,
> +	.vidioc_expbuf		= vb2_ioctl_expbuf,
> +	.vidioc_streamon	= vb2_ioctl_streamon,
> +	.vidioc_streamoff	= vb2_ioctl_streamoff,
> +};
> +
> +/*
> + * Queue operations
> + */
> +
> +static u32 camif_get_sizeimage(struct camif_priv *priv)
> +{
> +	struct v4l2_mbus_framefmt *outfmt;
> +	const struct imx_media_pixfmt *outcc;
> +
> +	outfmt = &priv->format_mbus[priv->output_pad];
> +	outcc = priv->cc[priv->output_pad];
> +	return (outfmt->width * outfmt->height * outcc->bpp) >> 3;
> +}
> +
> +static int camif_queue_setup(struct vb2_queue *vq,
> +			     unsigned int *nbuffers, unsigned int *nplanes,
> +			     unsigned int sizes[], struct device *alloc_devs[])
> +{
> +	struct camif_priv *priv = vb2_get_drv_priv(vq);
> +	unsigned int count = *nbuffers;
> +	u32 sizeimage;
> +
> +	if (!priv->src_sd)
> +		return -EPIPE;
> +
> +	if (vq->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> +		return -EINVAL;
> +
> +	sizeimage = camif_get_sizeimage(priv);
> +
> +	count = min_t(unsigned int, count, IMX_MEDIA_MAX_RING_BUFS);
> +	count = max_t(unsigned int, count, IMX_MEDIA_MIN_RING_BUFS);
> +
> +	while (sizeimage * count > VID_MEM_LIMIT)
> +		count--;
> +
> +	if (count < IMX_MEDIA_MIN_RING_BUFS)
> +		return -EINVAL;
> +
> +	*nplanes = 1;
> +	*nbuffers = count;
> +	sizes[0] = sizeimage;
> +
> +	return 0;
> +}
> +
> +static int camif_buf_init(struct vb2_buffer *vb)
> +{
> +	struct vb2_queue *vq = vb->vb2_queue;
> +	struct camif_priv *priv = vb2_get_drv_priv(vq);
> +	struct imx_media_buffer *buf = to_imx_media_vb(vb);
> +
> +	if (!priv->src_sd)
> +		return -EPIPE;
> +
> +	INIT_LIST_HEAD(&buf->list);
> +
> +	return 0;
> +}
> +
> +static int camif_buf_prepare(struct vb2_buffer *vb)
> +{
> +	struct vb2_queue *vq = vb->vb2_queue;
> +	struct camif_priv *priv = vb2_get_drv_priv(vq);
> +	u32 sizeimage = camif_get_sizeimage(priv);
> +	int ret;
> +
> +	if (!priv->src_sd)
> +		return -EPIPE;
> +
> +	if (vb2_plane_size(vb, 0) < sizeimage) {
> +		v4l2_err(&priv->sd,
> +			 "data will not fit into plane (%lu < %lu)\n",
> +			 vb2_plane_size(vb, 0), (long)sizeimage);
> +		return -EINVAL;
> +	}
> +
> +	vb2_set_plane_payload(vb, 0, sizeimage);
> +
> +	if (!priv->in_ring) {
> +		priv->in_ring = imx_media_alloc_dma_buf_ring(
> +			priv->md, &priv->src_sd->entity, &priv->sd.entity,
> +			sizeimage, vq->num_buffers, false);
> +		if (IS_ERR(priv->in_ring)) {
> +			v4l2_err(&priv->sd, "failed to alloc dma-buf ring\n");
> +			ret = PTR_ERR(priv->in_ring);
> +			priv->in_ring = NULL;
> +			return ret;
> +		}
> +	}
> +
> +	ret = imx_media_dma_buf_queue_from_vb(priv->in_ring, vb);
> +	if (ret)
> +		goto free_ring;
> +
> +	return 0;
> +
> +free_ring:
> +	imx_media_free_dma_buf_ring(priv->in_ring);
> +	priv->in_ring = NULL;
> +	return ret;
> +}
> +
> +static void camif_buf_queue(struct vb2_buffer *vb)
> +{
> +	struct camif_priv *priv = vb2_get_drv_priv(vb->vb2_queue);
> +	struct imx_media_buffer *buf = to_imx_media_vb(vb);
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&priv->q_lock, flags);
> +
> +	list_add_tail(&buf->list, &priv->ready_q);
> +
> +	spin_unlock_irqrestore(&priv->q_lock, flags);
> +}
> +
> +static int camif_start_streaming(struct vb2_queue *vq, unsigned int count)
> +{
> +	struct camif_priv *priv = vb2_get_drv_priv(vq);
> +	u32 sizeimage = camif_get_sizeimage(priv);
> +	struct imx_media_buffer *buf, *tmp;
> +	unsigned long flags;
> +	int ret;
> +
> +	if (vb2_is_streaming(vq))
> +		return 0;
> +
> +	if (!priv->src_sd)
> +		return -EPIPE;
> +
> +	if (!priv->in_ring) {
> +		priv->in_ring = imx_media_alloc_dma_buf_ring(
> +			priv->md, &priv->src_sd->entity, &priv->sd.entity,
> +			sizeimage, vq->num_buffers, false);
> +		if (IS_ERR(priv->in_ring)) {
> +			v4l2_err(&priv->sd, "failed to alloc dma-buf ring\n");
> +			ret = PTR_ERR(priv->in_ring);
> +			priv->in_ring = NULL;
> +			goto return_bufs;
> +		}
> +	}
> +
> +	ret = imx_media_pipeline_set_stream(priv->md, &priv->sd.entity,
> +					    &priv->mp, true);
> +	if (ret) {
> +		v4l2_err(&priv->sd, "pipeline_set_stream failed with %d\n",
> +			 ret);
> +		goto free_ring;
> +	}
> +
> +	priv->stop = false;
> +
> +	return 0;
> +
> +free_ring:
> +	imx_media_free_dma_buf_ring(priv->in_ring);
> +	priv->in_ring = NULL;
> +return_bufs:
> +	spin_lock_irqsave(&priv->q_lock, flags);
> +	list_for_each_entry_safe(buf, tmp, &priv->ready_q, list) {
> +		list_del(&buf->list);
> +		vb2_buffer_done(&buf->vbuf.vb2_buf, VB2_BUF_STATE_QUEUED);
> +	}
> +	spin_unlock_irqrestore(&priv->q_lock, flags);
> +	return ret;
> +}
> +
> +static void camif_stop_streaming(struct vb2_queue *vq)
> +{
> +	struct camif_priv *priv = vb2_get_drv_priv(vq);
> +	struct imx_media_buffer *frame;
> +	unsigned long flags;
> +	int ret;
> +
> +	if (!vb2_is_streaming(vq))
> +		return;
> +
> +	spin_lock_irqsave(&priv->q_lock, flags);
> +	priv->stop = true;
> +	spin_unlock_irqrestore(&priv->q_lock, flags);
> +
> +	ret = imx_media_pipeline_set_stream(priv->md, &priv->sd.entity,
> +					    &priv->mp, false);
> +	if (ret)
> +		v4l2_warn(&priv->sd, "pipeline_set_stream failed with %d\n",
> +			  ret);
> +
> +	if (priv->in_ring) {
> +		v4l2_warn(&priv->sd, "%s: in_ring was not freed\n",
> +			  __func__);
> +		imx_media_free_dma_buf_ring(priv->in_ring);
> +		priv->in_ring = NULL;
> +	}
> +
> +	/* release all active buffers */
> +	spin_lock_irqsave(&priv->q_lock, flags);
> +	while (!list_empty(&priv->ready_q)) {
> +		frame = list_entry(priv->ready_q.next,
> +				   struct imx_media_buffer, list);
> +		list_del(&frame->list);
> +		vb2_buffer_done(&frame->vbuf.vb2_buf, VB2_BUF_STATE_ERROR);
> +	}
> +	spin_unlock_irqrestore(&priv->q_lock, flags);
> +}
> +
> +static struct vb2_ops camif_qops = {
> +	.queue_setup	 = camif_queue_setup,
> +	.buf_init        = camif_buf_init,
> +	.buf_prepare	 = camif_buf_prepare,
> +	.buf_queue	 = camif_buf_queue,
> +	.wait_prepare	 = vb2_ops_wait_prepare,
> +	.wait_finish	 = vb2_ops_wait_finish,
> +	.start_streaming = camif_start_streaming,
> +	.stop_streaming  = camif_stop_streaming,
> +};
> +
> +/*
> + * File operations
> + */
> +static int camif_open(struct file *file)
> +{
> +	struct camif_priv *priv = video_drvdata(file);
> +	int ret;
> +
> +	if (mutex_lock_interruptible(&priv->mutex))
> +		return -ERESTARTSYS;
> +
> +	ret = v4l2_fh_open(file);
> +	if (ret)
> +		v4l2_err(&priv->sd, "v4l2_fh_open failed\n");
> +
> +	mutex_unlock(&priv->mutex);
> +	return ret;
> +}
> +
> +static int camif_release(struct file *file)
> +{
> +	struct camif_priv *priv = video_drvdata(file);
> +	struct vb2_queue *vq = &priv->buffer_queue;
> +	int ret = 0;
> +
> +	mutex_lock(&priv->mutex);
> +
> +	if (file->private_data == vq->owner) {
> +		vb2_queue_release(vq);
> +		vq->owner = NULL;
> +	}
> +
> +	v4l2_fh_release(file);
> +	mutex_unlock(&priv->mutex);
> +	return ret;
> +}
> +
> +static const struct v4l2_file_operations camif_fops = {
> +	.owner		= THIS_MODULE,
> +	.open		= camif_open,
> +	.release	= camif_release,
> +	.poll		= vb2_fop_poll,
> +	.unlocked_ioctl	= video_ioctl2,
> +	.mmap		= vb2_fop_mmap,
> +};
> +
> +static struct video_device camif_videodev = {
> +	.fops		= &camif_fops,
> +	.ioctl_ops	= &camif_ioctl_ops,
> +	.minor		= -1,
> +	.release	= video_device_release,
> +	.vfl_dir	= VFL_DIR_RX,
> +	.tvnorms	= V4L2_STD_NTSC | V4L2_STD_PAL | V4L2_STD_SECAM,
> +};
> +
> +/*
> + * Subdev and media entity operations
> + */
> +
> +static void camif_new_dma_buf(struct camif_priv *priv)
> +{
> +	struct imx_media_dma_buf *dmabuf;
> +	struct imx_media_buffer *buf;
> +	enum vb2_buffer_state state;
> +	struct vb2_buffer *vb;
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&priv->q_lock, flags);
> +
> +	if (priv->stop || list_empty(&priv->ready_q))
> +		goto unlock;
> +
> +	dmabuf = imx_media_dma_buf_dequeue(priv->in_ring);
> +	if (!dmabuf)
> +		goto unlock;
> +
> +	vb = dmabuf->vb;
> +	buf = to_imx_media_vb(vb);
> +	if (list_empty(&buf->list)) {
> +		dev_dbg(priv->dev, "%s: buf%d not queued\n", __func__,
> +			vb->index);
> +		goto unlock;
> +	}
> +
> +	dev_dbg(priv->dev, "%s: new buf%d\n", __func__, vb->index);
> +	vb->timestamp = ktime_get_ns();
> +	list_del_init(&buf->list);
> +	state = dmabuf->status == IMX_MEDIA_BUF_STATUS_DONE ?
> +		VB2_BUF_STATE_DONE : VB2_BUF_STATE_ERROR;
> +	vb2_buffer_done(vb, state);
> +unlock:
> +	spin_unlock_irqrestore(&priv->q_lock, flags);
> +}
> +
> +static long camif_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
> +{
> +	struct camif_priv *priv = v4l2_get_subdevdata(sd);
> +	struct imx_media_dma_buf_ring **ring;
> +
> +	switch (cmd) {
> +	case IMX_MEDIA_REQ_DMA_BUF_SINK_RING:
> +		if (!priv->in_ring)
> +			return -EINVAL;
> +		ring = (struct imx_media_dma_buf_ring **)arg;
> +		*ring = priv->in_ring;
> +		break;
> +	case IMX_MEDIA_NEW_DMA_BUF:
> +		camif_new_dma_buf(priv);
> +		break;
> +	case IMX_MEDIA_REL_DMA_BUF_SINK_RING:
> +		/* src indicates sink buffer ring can be freed */
> +		if (!priv->in_ring)
> +			return 0;
> +		v4l2_info(sd, "%s: freeing sink ring\n", __func__);
> +		imx_media_free_dma_buf_ring(priv->in_ring);
> +		priv->in_ring = NULL;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static int camif_link_setup(struct media_entity *entity,
> +			    const struct media_pad *local,
> +			    const struct media_pad *remote, u32 flags)
> +{
> +	struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
> +	struct camif_priv *priv = v4l2_get_subdevdata(sd);
> +	struct video_device *vfd = &priv->vfd;
> +	struct v4l2_subdev *remote_sd;
> +	int ret = 0;
> +
> +	dev_dbg(priv->dev, "link setup %s -> %s", remote->entity->name,
> +		local->entity->name);
> +
> +	if (is_media_entity_v4l2_video_device(remote->entity))
> +		return 0;
> +
> +	WARN_ON(local->flags & MEDIA_PAD_FL_SOURCE);
> +
> +	remote_sd = media_entity_to_v4l2_subdev(remote->entity);
> +
> +	/* reset controls to refresh with inherited from subdevs */
> +	v4l2_ctrl_handler_free(vfd->ctrl_handler);
> +	v4l2_ctrl_handler_init(vfd->ctrl_handler, 0);
> +
> +	if (flags & MEDIA_LNK_FL_ENABLED) {
> +		if (priv->src_sd)
> +			return -EBUSY;
> +		priv->src_sd = remote_sd;
> +		ret = imx_media_inherit_controls(priv->md, vfd,
> +						 &priv->src_sd->entity);
> +	} else {
> +		priv->src_sd = NULL;
> +	}
> +
> +	return ret;
> +}
> +
> +static int camif_enum_mbus_code(struct v4l2_subdev *sd,
> +				struct v4l2_subdev_pad_config *cfg,
> +				struct v4l2_subdev_mbus_code_enum *code)
> +{
> +	if (code->pad >= CAMIF_NUM_PADS)
> +		return -EINVAL;
> +
> +	return imx_media_enum_format(&code->code, code->index, true, true);
> +}
> +
> +static int camif_get_fmt(struct v4l2_subdev *sd,
> +			 struct v4l2_subdev_pad_config *cfg,
> +			 struct v4l2_subdev_format *sdformat)
> +{
> +	struct camif_priv *priv = v4l2_get_subdevdata(sd);
> +
> +	if (sdformat->pad >= CAMIF_NUM_PADS)
> +		return -EINVAL;
> +
> +	sdformat->format = priv->format_mbus[sdformat->pad];
> +
> +	return 0;
> +}
> +
> +static int camif_set_fmt(struct v4l2_subdev *sd,
> +			 struct v4l2_subdev_pad_config *cfg,
> +			 struct v4l2_subdev_format *sdformat)
> +{
> +	struct camif_priv *priv = v4l2_get_subdevdata(sd);
> +	const struct imx_media_pixfmt *cc;
> +	u32 code;
> +
> +	if (sdformat->pad >= CAMIF_NUM_PADS)
> +		return -EINVAL;
> +
> +	if (vb2_is_busy(&priv->buffer_queue)) {
> +		v4l2_err(&priv->sd, "%s queue busy\n", __func__);
> +		return -EBUSY;
> +	}
> +
> +	cc = imx_media_find_format(0, sdformat->format.code, true, true);
> +	if (!cc) {
> +		imx_media_enum_format(&code, 0, true, true);
> +		cc = imx_media_find_format(0, code, true, true);
> +		sdformat->format.code = cc->codes[0];
> +	}
> +
> +	/* Output pad mirrors input pad, no limitations on input pads */
> +	if (sdformat->pad == priv->output_pad)
> +		sdformat->format = priv->format_mbus[priv->input_pad];
> +
> +	if (sdformat->which == V4L2_SUBDEV_FORMAT_TRY) {
> +		cfg->try_fmt = sdformat->format;
> +	} else {
> +		priv->format_mbus[sdformat->pad] = sdformat->format;
> +		priv->cc[sdformat->pad] = cc;
> +	}
> +
> +	return 0;
> +}
> +
> +static int camif_init_pads(struct camif_priv *priv)
> +{
> +	struct video_device *vfd = &priv->vfd;
> +	struct imx_media_subdev *imxsd;
> +	struct imx_media_pad *pad;
> +	int i, ret;
> +
> +	imxsd = imx_media_find_subdev_by_sd(priv->md, &priv->sd);
> +	if (IS_ERR(imxsd))
> +		return PTR_ERR(imxsd);
> +
> +	if (imxsd->num_sink_pads != 1 || imxsd->num_src_pads != 1) {
> +		v4l2_err(&priv->sd, "invalid num pads %d/%d\n",
> +			 imxsd->num_sink_pads, imxsd->num_src_pads);
> +		return -EINVAL;
> +	}
> +
> +	priv->vd_pad.flags = MEDIA_PAD_FL_SINK;
> +	ret = media_entity_pads_init(&vfd->entity, 1, &priv->vd_pad);
> +	if (ret) {
> +		v4l2_err(&priv->sd, "failed to init device node pad\n");
> +		return ret;
> +	}
> +
> +	for (i = 0; i < CAMIF_NUM_PADS; i++) {
> +		pad = &imxsd->pad[i];
> +		priv->pad[i] = pad->pad;
> +		if (priv->pad[i].flags & MEDIA_PAD_FL_SINK)
> +			priv->input_pad = i;
> +		else
> +			priv->output_pad = i;
> +
> +		/* set a default mbus format  */
> +		ret = imx_media_init_mbus_fmt(&priv->format_mbus[i],
> +					      640, 480, 0, V4L2_FIELD_NONE,
> +					      &priv->cc[i]);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	return media_entity_pads_init(&priv->sd.entity, CAMIF_NUM_PADS,
> +				      priv->pad);
> +}
> +
> +static int camif_registered(struct v4l2_subdev *sd)
> +{
> +	struct camif_priv *priv = v4l2_get_subdevdata(sd);
> +	struct vb2_queue *vq = &priv->buffer_queue;
> +	struct video_device *vfd = &priv->vfd;
> +	struct v4l2_mbus_framefmt *infmt, *outfmt;
> +	int ret;
> +
> +	/* get media device */
> +	priv->md = dev_get_drvdata(sd->v4l2_dev->dev);
> +
> +	vfd->v4l2_dev = sd->v4l2_dev;
> +
> +	ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0);
> +	if (ret) {
> +		v4l2_err(sd, "Failed to register video device\n");
> +		return ret;
> +	}
> +
> +	vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> +	vq->io_modes = VB2_MMAP | VB2_DMABUF;
> +	vq->drv_priv = priv;
> +	vq->buf_struct_size = sizeof(struct imx_media_buffer);
> +	vq->ops = &camif_qops;
> +	vq->mem_ops = &vb2_dma_contig_memops;
> +	vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
> +	vq->lock = &priv->mutex;
> +	vq->min_buffers_needed = 2;
> +	vq->dev = priv->dev;
> +
> +	ret = vb2_queue_init(vq);
> +	if (ret) {
> +		v4l2_err(sd, "vb2_queue_init failed\n");
> +		goto unreg;
> +	}
> +
> +	INIT_LIST_HEAD(&priv->ready_q);
> +
> +	ret = camif_init_pads(priv);
> +	if (ret) {
> +		v4l2_err(sd, "camif_init_pads failed\n");
> +		goto unreg;
> +	}
> +
> +	/* create the link to our device node */
> +	ret = media_create_pad_link(&sd->entity, priv->output_pad,
> +				    &vfd->entity, 0,
> +				    MEDIA_LNK_FL_IMMUTABLE |
> +				    MEDIA_LNK_FL_ENABLED);
> +	if (ret) {
> +		v4l2_err(sd, "failed to create link to device node\n");
> +		goto unreg;
> +	}
> +
> +	/* setup default pad formats */
> +	infmt = &priv->format_mbus[priv->input_pad];
> +	outfmt = &priv->format_mbus[priv->output_pad];
> +	ret = imx_media_init_mbus_fmt(outfmt, 640, 480, 0, V4L2_FIELD_NONE,
> +				      &priv->cc[priv->output_pad]);
> +	if (ret)
> +		goto unreg;
> +
> +	*infmt = *outfmt;
> +	priv->cc[priv->input_pad] = priv->cc[priv->output_pad];
> +
> +	priv->current_std = V4L2_STD_UNKNOWN;
> +
> +	v4l2_info(sd, "Registered %s as /dev/%s\n", vfd->name,
> +		  video_device_node_name(vfd));
> +
> +	vfd->ctrl_handler = &priv->ctrl_hdlr;
> +
> +	return 0;
> +unreg:
> +	video_unregister_device(vfd);
> +	return ret;
> +}
> +
> +static void camif_unregistered(struct v4l2_subdev *sd)
> +{
> +	struct camif_priv *priv = v4l2_get_subdevdata(sd);
> +	struct video_device *vfd = &priv->vfd;
> +
> +	mutex_lock(&priv->mutex);
> +
> +	if (video_is_registered(vfd)) {
> +		video_unregister_device(vfd);
> +		media_entity_cleanup(&vfd->entity);
> +	}
> +
> +	mutex_unlock(&priv->mutex);
> +}
> +
> +static const struct v4l2_subdev_internal_ops camif_internal_ops = {
> +	.registered = camif_registered,
> +	.unregistered = camif_unregistered,
> +};
> +
> +static struct v4l2_subdev_core_ops camif_core_ops = {
> +	.ioctl = camif_ioctl,
> +};
> +
> +static struct media_entity_operations camif_entity_ops = {
> +	.link_setup = camif_link_setup,
> +	.link_validate = v4l2_subdev_link_validate,
> +};
> +
> +static struct v4l2_subdev_pad_ops camif_pad_ops = {
> +	.enum_mbus_code = camif_enum_mbus_code,
> +	.get_fmt = camif_get_fmt,
> +	.set_fmt = camif_set_fmt,
> +};
> +
> +static struct v4l2_subdev_ops camif_subdev_ops = {
> +	.pad = &camif_pad_ops,
> +	.core = &camif_core_ops,
> +};
> +
> +static int camif_probe(struct platform_device *pdev)
> +{
> +	struct imx_media_internal_sd_platformdata *pdata;
> +	struct camif_priv *priv;
> +	struct video_device *vfd;
> +	int ret;
> +
> +	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, priv);
> +	priv->dev = &pdev->dev;
> +
> +	pdata = priv->dev->platform_data;
> +
> +	mutex_init(&priv->mutex);
> +	spin_lock_init(&priv->q_lock);
> +
> +	v4l2_subdev_init(&priv->sd, &camif_subdev_ops);
> +	v4l2_set_subdevdata(&priv->sd, priv);
> +	priv->sd.internal_ops = &camif_internal_ops;
> +	priv->sd.entity.ops = &camif_entity_ops;
> +	priv->sd.entity.function = MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER;
> +	priv->sd.dev = &pdev->dev;
> +	priv->sd.owner = THIS_MODULE;
> +	/* get our group id and camif id */
> +	priv->sd.grp_id = pdata->grp_id;
> +	priv->id = (pdata->grp_id >> IMX_MEDIA_GRP_ID_CAMIF_BIT) - 1;
> +	strncpy(priv->sd.name, pdata->sd_name, sizeof(priv->sd.name));
> +	snprintf(camif_videodev.name, sizeof(camif_videodev.name),
> +		 "%s devnode", pdata->sd_name);
> +
> +	priv->sd.flags = V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
> +
> +	vfd = &priv->vfd;
> +	*vfd = camif_videodev;
> +	vfd->lock = &priv->mutex;
> +	vfd->queue = &priv->buffer_queue;
> +
> +	video_set_drvdata(vfd, priv);
> +
> +	v4l2_ctrl_handler_init(&priv->ctrl_hdlr, 0);
> +
> +	ret = v4l2_async_register_subdev(&priv->sd);
> +	if (ret)
> +		v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
> +
> +	return ret;
> +}
> +
> +static int camif_remove(struct platform_device *pdev)
> +{
> +	struct camif_priv *priv =
> +		(struct camif_priv *)platform_get_drvdata(pdev);
> +
> +	v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
> +	v4l2_async_unregister_subdev(&priv->sd);
> +	media_entity_cleanup(&priv->sd.entity);
> +	v4l2_device_unregister_subdev(&priv->sd);
> +
> +	return 0;
> +}
> +
> +static const struct platform_device_id camif_ids[] = {
> +	{ .name = "imx-media-camif" },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(platform, camif_ids);
> +
> +static struct platform_driver imx_camif_driver = {
> +	.probe		= camif_probe,
> +	.remove		= camif_remove,
> +	.driver		= {
> +		.name	= "imx-media-camif",
> +	},
> +};
> +
> +module_platform_driver(imx_camif_driver);
> +
> +MODULE_DESCRIPTION("i.MX camera interface subdev driver");
> +MODULE_AUTHOR("Steve Longerbeam <steve_longerbeam@...tor.com>");
> +MODULE_LICENSE("GPL");
> 

Regards,

	Hans

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