Re: [PATCH v3][RFC] add raw video stream support for Samsung SUR40

[Florian Echtler <floe@butterbrot.org>]

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Hello again,

does anyone have any suggestions why USERPTR still fails with dma-sg?

Could I just disable the corresponding capability for the moment so that
the patch could perhaps be merged, and investigate this separately?

Best, Florian

On 04.02.2015 16:30, Florian Echtler wrote:
> This patch adds raw video support for the Samsung SUR40, now finally using
> videobuf2-dma-sg and the usb_sg_init/_wait helper functions. Further comments
> regarding buffer handling are invited, as v4l2-compliance -s still fails the
> USERPTR test.
> 
> Signed-off-by: Florian Echtler <floe@butterbrot.org>
> ---
>  drivers/input/touchscreen/sur40.c | 424 ++++++++++++++++++++++++++++++++++++--
>  1 file changed, 412 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/input/touchscreen/sur40.c b/drivers/input/touchscreen/sur40.c
> index f1cb051..33bc1b8 100644
> --- a/drivers/input/touchscreen/sur40.c
> +++ b/drivers/input/touchscreen/sur40.c
> @@ -1,7 +1,7 @@
>  /*
>   * Surface2.0/SUR40/PixelSense input driver
>   *
> - * Copyright (c) 2013 by Florian 'floe' Echtler <floe@butterbrot.org>
> + * Copyright (c) 2014 by Florian 'floe' Echtler <floe@butterbrot.org>
>   *
>   * Derived from the USB Skeleton driver 1.1,
>   * Copyright (c) 2003 Greg Kroah-Hartman (greg@kroah.com)
> @@ -12,6 +12,9 @@
>   * and from the generic hid-multitouch driver,
>   * Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr>
>   *
> + * and from the v4l2-pci-skeleton driver,
> + * Copyright (c) Copyright 2014 Cisco Systems, 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
> @@ -31,6 +34,11 @@
>  #include <linux/input-polldev.h>
>  #include <linux/input/mt.h>
>  #include <linux/usb/input.h>
> +#include <linux/videodev2.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-dev.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/videobuf2-dma-sg.h>
>  
>  /* read 512 bytes from endpoint 0x86 -> get header + blobs */
>  struct sur40_header {
> @@ -82,9 +90,19 @@ struct sur40_data {
>  	struct sur40_blob   blobs[];
>  } __packed;
>  
> +/* read 512 bytes from endpoint 0x82 -> get header below
> + * continue reading 16k blocks until header.size bytes read */
> +struct sur40_image_header {
> +	__le32 magic;     /* "SUBF" */
> +	__le32 packet_id;
> +	__le32 size;      /* always 0x0007e900 = 960x540 */
> +	__le32 timestamp; /* milliseconds (increases by 16 or 17 each frame) */
> +	__le32 unknown;   /* "epoch?" always 02/03 00 00 00 */
> +} __packed;
>  
>  /* version information */
>  #define DRIVER_SHORT   "sur40"
> +#define DRIVER_LONG    "Samsung SUR40"
>  #define DRIVER_AUTHOR  "Florian 'floe' Echtler <floe@butterbrot.org>"
>  #define DRIVER_DESC    "Surface2.0/SUR40/PixelSense input driver"
>  
> @@ -99,6 +117,13 @@ struct sur40_data {
>  /* touch data endpoint */
>  #define TOUCH_ENDPOINT 0x86
>  
> +/* video data endpoint */
> +#define VIDEO_ENDPOINT 0x82
> +
> +/* video header fields */
> +#define VIDEO_HEADER_MAGIC 0x46425553
> +#define VIDEO_PACKET_SIZE  16384
> +
>  /* polling interval (ms) */
>  #define POLL_INTERVAL 10
>  
> @@ -113,21 +138,23 @@ struct sur40_data {
>  #define SUR40_GET_STATE   0xc5 /*  4 bytes state (?) */
>  #define SUR40_GET_SENSORS 0xb1 /*  8 bytes sensors   */
>  
> -/*
> - * Note: an earlier, non-public version of this driver used USB_RECIP_ENDPOINT
> - * here by mistake which is very likely to have corrupted the firmware EEPROM
> - * on two separate SUR40 devices. Thanks to Alan Stern who spotted this bug.
> - * Should you ever run into a similar problem, the background story to this
> - * incident and instructions on how to fix the corrupted EEPROM are available
> - * at https://floe.butterbrot.org/matrix/hacking/surface/brick.html
> -*/
> -
> +/* master device state */
>  struct sur40_state {
>  
>  	struct usb_device *usbdev;
>  	struct device *dev;
>  	struct input_polled_dev *input;
>  
> +	struct v4l2_device v4l2;
> +	struct video_device vdev;
> +	struct mutex lock;
> +
> +	struct vb2_queue queue;
> +	struct vb2_alloc_ctx *alloc_ctx;
> +	struct list_head buf_list;
> +	spinlock_t qlock;
> +	int sequence;
> +
>  	struct sur40_data *bulk_in_buffer;
>  	size_t bulk_in_size;
>  	u8 bulk_in_epaddr;
> @@ -135,6 +162,27 @@ struct sur40_state {
>  	char phys[64];
>  };
>  
> +struct sur40_buffer {
> +	struct vb2_buffer vb;
> +	struct list_head list;
> +};
> +
> +/* forward declarations */
> +static const struct video_device sur40_video_device;
> +static const struct v4l2_pix_format sur40_video_format;
> +static const struct vb2_queue sur40_queue;
> +static void sur40_process_video(struct sur40_state *sur40);
> +
> +/*
> + * Note: an earlier, non-public version of this driver used USB_RECIP_ENDPOINT
> + * here by mistake which is very likely to have corrupted the firmware EEPROM
> + * on two separate SUR40 devices. Thanks to Alan Stern who spotted this bug.
> + * Should you ever run into a similar problem, the background story to this
> + * incident and instructions on how to fix the corrupted EEPROM are available
> + * at https://floe.butterbrot.org/matrix/hacking/surface/brick.html
> +*/
> +
> +/* command wrapper */
>  static int sur40_command(struct sur40_state *dev,
>  			 u8 command, u16 index, void *buffer, u16 size)
>  {
> @@ -247,7 +295,6 @@ static void sur40_report_blob(struct sur40_blob *blob, struct input_dev *input)
>  /* core function: poll for new input data */
>  static void sur40_poll(struct input_polled_dev *polldev)
>  {
> -
>  	struct sur40_state *sur40 = polldev->private;
>  	struct input_dev *input = polldev->input;
>  	int result, bulk_read, need_blobs, packet_blobs, i;
> @@ -314,6 +361,81 @@ static void sur40_poll(struct input_polled_dev *polldev)
>  
>  	input_mt_sync_frame(input);
>  	input_sync(input);
> +
> +	sur40_process_video(sur40);
> +}
> +
> +/* deal with video data */
> +static void sur40_process_video(struct sur40_state *sur40)
> +{
> +
> +	struct sur40_image_header *img = (void *)(sur40->bulk_in_buffer);
> +	struct sur40_buffer *new_buf;
> +	struct usb_sg_request sgr;
> +	struct sg_table *sgt;
> +	int result, bulk_read;
> +
> +	if (list_empty(&sur40->buf_list))
> +		return;
> +
> +	/* get a new buffer from the list */
> +	spin_lock(&sur40->qlock);
> +	new_buf = list_entry(sur40->buf_list.next, struct sur40_buffer, list);
> +	list_del(&new_buf->list);
> +	spin_unlock(&sur40->qlock);
> +
> +	/* retrieve data via bulk read */
> +	result = usb_bulk_msg(sur40->usbdev,
> +			usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT),
> +			sur40->bulk_in_buffer, sur40->bulk_in_size,
> +			&bulk_read, 1000);
> +
> +	if (result < 0) {
> +		dev_err(sur40->dev, "error in usb_bulk_read\n");
> +		goto err_poll;
> +	}
> +
> +	if (bulk_read != sizeof(struct sur40_image_header)) {
> +		dev_err(sur40->dev, "received %d bytes (%ld expected)\n",
> +			bulk_read, sizeof(struct sur40_image_header));
> +		goto err_poll;
> +	}
> +
> +	if (le32_to_cpu(img->magic) != VIDEO_HEADER_MAGIC) {
> +		dev_err(sur40->dev, "image magic mismatch\n");
> +		goto err_poll;
> +	}
> +
> +	if (le32_to_cpu(img->size) != sur40_video_format.sizeimage) {
> +		dev_err(sur40->dev, "image size mismatch\n");
> +		goto err_poll;
> +	}
> +
> +	sgt = vb2_dma_sg_plane_desc(&new_buf->vb, 0);
> +
> +	result = usb_sg_init(&sgr, sur40->usbdev,
> +		usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT), 0,
> +		sgt->sgl, sgt->nents, sur40_video_format.sizeimage, 0);
> +	if (result < 0) {
> +		dev_err(sur40->dev, "error in usb_sg_init\n");
> +		goto err_poll;
> +	}
> +
> +	usb_sg_wait(&sgr);
> +	if (sgr.status < 0) {
> +		dev_err(sur40->dev, "error in usb_sg_wait\n");
> +		goto err_poll;
> +	}
> +
> +	/* mark as finished */
> +	v4l2_get_timestamp(&new_buf->vb.v4l2_buf.timestamp);
> +	new_buf->vb.v4l2_buf.sequence = sur40->sequence++;
> +	new_buf->vb.v4l2_buf.field = V4L2_FIELD_NONE;
> +	vb2_buffer_done(&new_buf->vb, VB2_BUF_STATE_DONE);
> +	return;
> +
> +err_poll:
> +	vb2_buffer_done(&new_buf->vb, VB2_BUF_STATE_ERROR);
>  }
>  
>  /* Initialize input device parameters. */
> @@ -377,6 +499,11 @@ static int sur40_probe(struct usb_interface *interface,
>  		goto err_free_dev;
>  	}
>  
> +	/* initialize locks/lists */
> +	INIT_LIST_HEAD(&sur40->buf_list);
> +	spin_lock_init(&sur40->qlock);
> +	mutex_init(&sur40->lock);
> +
>  	/* Set up polled input device control structure */
>  	poll_dev->private = sur40;
>  	poll_dev->poll_interval = POLL_INTERVAL;
> @@ -387,7 +514,7 @@ static int sur40_probe(struct usb_interface *interface,
>  	/* Set up regular input device structure */
>  	sur40_input_setup(poll_dev->input);
>  
> -	poll_dev->input->name = "Samsung SUR40";
> +	poll_dev->input->name = DRIVER_LONG;
>  	usb_to_input_id(usbdev, &poll_dev->input->id);
>  	usb_make_path(usbdev, sur40->phys, sizeof(sur40->phys));
>  	strlcat(sur40->phys, "/input0", sizeof(sur40->phys));
> @@ -408,6 +535,7 @@ static int sur40_probe(struct usb_interface *interface,
>  		goto err_free_polldev;
>  	}
>  
> +	/* register the polled input device */
>  	error = input_register_polled_device(poll_dev);
>  	if (error) {
>  		dev_err(&interface->dev,
> @@ -415,12 +543,54 @@ static int sur40_probe(struct usb_interface *interface,
>  		goto err_free_buffer;
>  	}
>  
> +	/* register the video master device */
> +	snprintf(sur40->v4l2.name, sizeof(sur40->v4l2.name), "%s", DRIVER_LONG);
> +	error = v4l2_device_register(sur40->dev, &sur40->v4l2);
> +	if (error) {
> +		dev_err(&interface->dev,
> +			"Unable to register video master device.");
> +		goto err_unreg_v4l2;
> +	}
> +
> +	/* initialize the lock and subdevice */
> +	sur40->queue = sur40_queue;
> +	sur40->queue.drv_priv = sur40;
> +	sur40->queue.lock = &sur40->lock;
> +
> +	/* initialize the queue */
> +	error = vb2_queue_init(&sur40->queue);
> +	if (error)
> +		goto err_unreg_v4l2;
> +
> +	sur40->alloc_ctx = vb2_dma_sg_init_ctx(sur40->dev);
> +	if (IS_ERR(sur40->alloc_ctx)) {
> +		dev_err(sur40->dev, "Can't allocate buffer context");
> +		goto err_unreg_v4l2;
> +	}
> +
> +	sur40->vdev = sur40_video_device;
> +	sur40->vdev.v4l2_dev = &sur40->v4l2;
> +	sur40->vdev.lock = &sur40->lock;
> +	sur40->vdev.queue = &sur40->queue;
> +	video_set_drvdata(&sur40->vdev, sur40);
> +
> +	error = video_register_device(&sur40->vdev, VFL_TYPE_GRABBER, -1);
> +	if (error) {
> +		dev_err(&interface->dev,
> +			"Unable to register video subdevice.");
> +		goto err_unreg_video;
> +	}
> +
>  	/* we can register the device now, as it is ready */
>  	usb_set_intfdata(interface, sur40);
>  	dev_dbg(&interface->dev, "%s is now attached\n", DRIVER_DESC);
>  
>  	return 0;
>  
> +err_unreg_video:
> +	video_unregister_device(&sur40->vdev);
> +err_unreg_v4l2:
> +	v4l2_device_unregister(&sur40->v4l2);
>  err_free_buffer:
>  	kfree(sur40->bulk_in_buffer);
>  err_free_polldev:
> @@ -436,6 +606,10 @@ static void sur40_disconnect(struct usb_interface *interface)
>  {
>  	struct sur40_state *sur40 = usb_get_intfdata(interface);
>  
> +	video_unregister_device(&sur40->vdev);
> +	v4l2_device_unregister(&sur40->v4l2);
> +	vb2_dma_sg_cleanup_ctx(sur40->alloc_ctx);
> +
>  	input_unregister_polled_device(sur40->input);
>  	input_free_polled_device(sur40->input);
>  	kfree(sur40->bulk_in_buffer);
> @@ -445,12 +619,238 @@ static void sur40_disconnect(struct usb_interface *interface)
>  	dev_dbg(&interface->dev, "%s is now disconnected\n", DRIVER_DESC);
>  }
>  
> +/*
> + * Setup the constraints of the queue: besides setting the number of planes
> + * per buffer and the size and allocation context of each plane, it also
> + * checks if sufficient buffers have been allocated. Usually 3 is a good
> + * minimum number: many DMA engines need a minimum of 2 buffers in the
> + * queue and you need to have another available for userspace processing.
> + */
> +static int sur40_queue_setup(struct vb2_queue *q, const struct v4l2_format *fmt,
> +		       unsigned int *nbuffers, unsigned int *nplanes,
> +		       unsigned int sizes[], void *alloc_ctxs[])
> +{
> +	struct sur40_state *sur40 = vb2_get_drv_priv(q);
> +
> +	if (q->num_buffers + *nbuffers < 3)
> +		*nbuffers = 3 - q->num_buffers;
> +
> +	if (fmt && fmt->fmt.pix.sizeimage < sur40_video_format.sizeimage)
> +		return -EINVAL;
> +
> +	*nplanes = 1;
> +	sizes[0] = fmt ? fmt->fmt.pix.sizeimage : sur40_video_format.sizeimage;
> +	alloc_ctxs[0] = sur40->alloc_ctx;
> +
> +	return 0;
> +}
> +
> +/*
> + * Prepare the buffer for queueing to the DMA engine: check and set the
> + * payload size.
> + */
> +static int sur40_buffer_prepare(struct vb2_buffer *vb)
> +{
> +	struct sur40_state *sur40 = vb2_get_drv_priv(vb->vb2_queue);
> +	unsigned long size = sur40_video_format.sizeimage;
> +
> +	if (vb2_plane_size(vb, 0) < size) {
> +		dev_err(&sur40->usbdev->dev, "buffer too small (%lu < %lu)\n",
> +			 vb2_plane_size(vb, 0), size);
> +		return -EINVAL;
> +	}
> +
> +	vb2_set_plane_payload(vb, 0, size);
> +	return 0;
> +}
> +
> +/*
> + * Queue this buffer to the DMA engine.
> + */
> +static void sur40_buffer_queue(struct vb2_buffer *vb)
> +{
> +	struct sur40_state *sur40 = vb2_get_drv_priv(vb->vb2_queue);
> +	struct sur40_buffer *buf = (struct sur40_buffer *)vb;
> +
> +	spin_lock(&sur40->qlock);
> +	list_add_tail(&buf->list, &sur40->buf_list);
> +	spin_unlock(&sur40->qlock);
> +}
> +
> +static void return_all_buffers(struct sur40_state *sur40,
> +			       enum vb2_buffer_state state)
> +{
> +	struct sur40_buffer *buf, *node;
> +
> +	spin_lock(&sur40->qlock);
> +	list_for_each_entry_safe(buf, node, &sur40->buf_list, list) {
> +		vb2_buffer_done(&buf->vb, state);
> +		list_del(&buf->list);
> +	}
> +	spin_unlock(&sur40->qlock);
> +}
> +
> +/*
> + * Start streaming. First check if the minimum number of buffers have been
> + * queued. If not, then return -ENOBUFS and the vb2 framework will call
> + * this function again the next time a buffer has been queued until enough
> + * buffers are available to actually start the DMA engine.
> + */
> +static int sur40_start_streaming(struct vb2_queue *vq, unsigned int count)
> +{
> +	struct sur40_state *sur40 = vb2_get_drv_priv(vq);
> +
> +	sur40->sequence = 0;
> +	return 0;
> +}
> +
> +/*
> + * Stop the DMA engine. Any remaining buffers in the DMA queue are dequeued
> + * and passed on to the vb2 framework marked as STATE_ERROR.
> + */
> +static void sur40_stop_streaming(struct vb2_queue *vq)
> +{
> +	struct sur40_state *sur40 = vb2_get_drv_priv(vq);
> +
> +	/* Release all active buffers */
> +	return_all_buffers(sur40, VB2_BUF_STATE_ERROR);
> +}
> +
> +/* V4L ioctl */
> +static int sur40_vidioc_querycap(struct file *file, void *priv,
> +				 struct v4l2_capability *cap)
> +{
> +	struct sur40_state *sur40 = video_drvdata(file);
> +
> +	strlcpy(cap->driver, DRIVER_SHORT, sizeof(cap->driver));
> +	strlcpy(cap->card, DRIVER_LONG, sizeof(cap->card));
> +	usb_make_path(sur40->usbdev, cap->bus_info, sizeof(cap->bus_info));
> +	cap->device_caps = V4L2_CAP_VIDEO_CAPTURE |
> +		V4L2_CAP_READWRITE |
> +		V4L2_CAP_STREAMING;
> +	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
> +	return 0;
> +}
> +
> +static int sur40_vidioc_enum_input(struct file *file, void *priv,
> +				   struct v4l2_input *i)
> +{
> +	if (i->index != 0)
> +		return -EINVAL;
> +	i->type = V4L2_INPUT_TYPE_CAMERA;
> +	i->std = V4L2_STD_UNKNOWN;
> +	strlcpy(i->name, "In-Cell Sensor", sizeof(i->name));
> +	i->capabilities = 0;
> +	return 0;
> +}
> +
> +static int sur40_vidioc_s_input(struct file *file, void *priv, unsigned int i)
> +{
> +	return (i == 0) ? 0 : -EINVAL;
> +}
> +
> +static int sur40_vidioc_g_input(struct file *file, void *priv, unsigned int *i)
> +{
> +	*i = 0;
> +	return 0;
> +}
> +
> +static int sur40_vidioc_fmt(struct file *file, void *priv,
> +			    struct v4l2_format *f)
> +{
> +	f->fmt.pix = sur40_video_format;
> +	return 0;
> +}
> +
> +static int sur40_vidioc_enum_fmt(struct file *file, void *priv,
> +				 struct v4l2_fmtdesc *f)
> +{
> +	if (f->index != 0)
> +		return -EINVAL;
> +	strlcpy(f->description, "8-bit greyscale", sizeof(f->description));
> +	f->pixelformat = V4L2_PIX_FMT_GREY;
> +	f->flags = 0;
> +	return 0;
> +}
> +
>  static const struct usb_device_id sur40_table[] = {
>  	{ USB_DEVICE(ID_MICROSOFT, ID_SUR40) },  /* Samsung SUR40 */
>  	{ }                                      /* terminating null entry */
>  };
>  MODULE_DEVICE_TABLE(usb, sur40_table);
>  
> +/* V4L2 structures */
> +static const struct vb2_ops sur40_queue_ops = {
> +	.queue_setup		= sur40_queue_setup,
> +	.buf_prepare		= sur40_buffer_prepare,
> +	.buf_queue		= sur40_buffer_queue,
> +	.start_streaming	= sur40_start_streaming,
> +	.stop_streaming		= sur40_stop_streaming,
> +	.wait_prepare		= vb2_ops_wait_prepare,
> +	.wait_finish		= vb2_ops_wait_finish,
> +};
> +
> +static const struct vb2_queue sur40_queue = {
> +	.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
> +	.io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF | VB2_USERPTR,
> +	.buf_struct_size = sizeof(struct sur40_buffer),
> +	.ops = &sur40_queue_ops,
> +	.mem_ops = &vb2_dma_sg_memops,
> +	.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC,
> +	.min_buffers_needed = 3,
> +};
> +
> +static const struct v4l2_file_operations sur40_video_fops = {
> +	.owner = THIS_MODULE,
> +	.open = v4l2_fh_open,
> +	.release = vb2_fop_release,
> +	.unlocked_ioctl = video_ioctl2,
> +	.read = vb2_fop_read,
> +	.mmap = vb2_fop_mmap,
> +	.poll = vb2_fop_poll,
> +};
> +
> +static const struct v4l2_ioctl_ops sur40_video_ioctl_ops = {
> +
> +	.vidioc_querycap	= sur40_vidioc_querycap,
> +
> +	.vidioc_enum_fmt_vid_cap = sur40_vidioc_enum_fmt,
> +	.vidioc_try_fmt_vid_cap	= sur40_vidioc_fmt,
> +	.vidioc_s_fmt_vid_cap	= sur40_vidioc_fmt,
> +	.vidioc_g_fmt_vid_cap	= sur40_vidioc_fmt,
> +
> +	.vidioc_enum_input	= sur40_vidioc_enum_input,
> +	.vidioc_g_input		= sur40_vidioc_g_input,
> +	.vidioc_s_input		= sur40_vidioc_s_input,
> +
> +	.vidioc_reqbufs		= vb2_ioctl_reqbufs,
> +	.vidioc_create_bufs	= vb2_ioctl_create_bufs,
> +	.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,
> +};
> +
> +static const struct video_device sur40_video_device = {
> +	.name = DRIVER_LONG,
> +	.fops = &sur40_video_fops,
> +	.ioctl_ops = &sur40_video_ioctl_ops,
> +	.release = video_device_release_empty,
> +};
> +
> +static const struct v4l2_pix_format sur40_video_format = {
> +	.pixelformat = V4L2_PIX_FMT_GREY,
> +	.width  = SENSOR_RES_X / 2,
> +	.height = SENSOR_RES_Y / 2,
> +	.field = V4L2_FIELD_NONE,
> +	.colorspace = V4L2_COLORSPACE_SRGB,
> +	.bytesperline = SENSOR_RES_X / 2,
> +	.sizeimage = (SENSOR_RES_X/2) * (SENSOR_RES_Y/2),
> +};
> +
>  /* USB-specific object needed to register this driver with the USB subsystem. */
>  static struct usb_driver sur40_driver = {
>  	.name = DRIVER_SHORT,
> 


-- 
SENT FROM MY DEC VT50 TERMINAL


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