Message-Id: <1370857931-6586-1-git-send-email-lkundrak@v3.sk>
Date:	Mon, 10 Jun 2013 11:52:11 +0200
From:	Lubomir Rintel <lkundrak@...sk>
To:	linux-media@...r.kernel.org
Cc:	Lubomir Rintel <lkundrak@...sk>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] [media] usbtv: Add driver for Fushicai USBTV007 video frame grabber

Reverse-engineered driver for cheapo video digitizer, made from observations of
Windows XP driver. The protocol is not yet completely understood, so far we
don't provide any controls, only support a single format out of three and don't
support the audio device.

Signed-off-by: Lubomir Rintel <lkundrak@...sk>
Cc: Mauro Carvalho Chehab <mchehab@...hat.com>
Cc: linux-kernel@...r.kernel.org
Cc: linux-media@...r.kernel.org
---
Hi everyone,

this is my first experience with v4l2, videobuf2, usb and a video video
hardware. Therefore, please be careful reviewing this as I could have made
mistakes that are not likely to happen for more experienced people.

I've not figured out the controls for the hardware yet, thus the huge set of
unidentified register settings. I've been very unsuccessfully struggling with
my Windows installation (the Windows driver for hardware was not usable enough
with any other player than the cranky one shipped with it, crashing and
deadlocking quite often). It seems quite possible to create a simpler
directshow app that would just set the controls; and I plan to do that as time
permits.

Also, I the hardware uses V4L2_FIELD_ALTERNATE interlacing, but I couldn't make
it work, so I'm doing deinterlacing in the driver, which is obviously not the
right thing to do. Could anyone educate me on proper way of dealing with data
interlaced this way? I could not find a decent example, and I'm not even sure
what the sizes in format specification are (like, is the height after or before
deinterlacing?).

Thanks a lot!
Lubo

 drivers/media/usb/Kconfig        |    1 +
 drivers/media/usb/Makefile       |    1 +
 drivers/media/usb/usbtv/Kconfig  |   10 +
 drivers/media/usb/usbtv/Makefile |    1 +
 drivers/media/usb/usbtv/usbtv.c  |  723 ++++++++++++++++++++++++++++++++++++++
 5 files changed, 736 insertions(+), 0 deletions(-)
 create mode 100644 drivers/media/usb/usbtv/Kconfig
 create mode 100644 drivers/media/usb/usbtv/Makefile
 create mode 100644 drivers/media/usb/usbtv/usbtv.c

diff --git a/drivers/media/usb/Kconfig b/drivers/media/usb/Kconfig
index 0a7d520..8e10267 100644
--- a/drivers/media/usb/Kconfig
+++ b/drivers/media/usb/Kconfig
@@ -17,6 +17,7 @@ source "drivers/media/usb/zr364xx/Kconfig"
 source "drivers/media/usb/stkwebcam/Kconfig"
 source "drivers/media/usb/s2255/Kconfig"
 source "drivers/media/usb/sn9c102/Kconfig"
+source "drivers/media/usb/usbtv/Kconfig"
 endif
 
 if MEDIA_ANALOG_TV_SUPPORT
diff --git a/drivers/media/usb/Makefile b/drivers/media/usb/Makefile
index 7f51d7e..0935f47 100644
--- a/drivers/media/usb/Makefile
+++ b/drivers/media/usb/Makefile
@@ -20,3 +20,4 @@ obj-$(CONFIG_VIDEO_STK1160) += stk1160/
 obj-$(CONFIG_VIDEO_CX231XX) += cx231xx/
 obj-$(CONFIG_VIDEO_TM6000) += tm6000/
 obj-$(CONFIG_VIDEO_EM28XX) += em28xx/
+obj-$(CONFIG_VIDEO_USBTV) += usbtv/
diff --git a/drivers/media/usb/usbtv/Kconfig b/drivers/media/usb/usbtv/Kconfig
new file mode 100644
index 0000000..8864436
--- /dev/null
+++ b/drivers/media/usb/usbtv/Kconfig
@@ -0,0 +1,10 @@
+config VIDEO_USBTV
+        tristate "USBTV007 video capture support"
+        depends on VIDEO_DEV
+        select VIDEOBUF2_VMALLOC
+
+        ---help---
+          This is a video4linux2 driver for USBTV007 based video capture devices.
+
+          To compile this driver as a module, choose M here: the
+          module will be called usbtv
diff --git a/drivers/media/usb/usbtv/Makefile b/drivers/media/usb/usbtv/Makefile
new file mode 100644
index 0000000..28b872f
--- /dev/null
+++ b/drivers/media/usb/usbtv/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_VIDEO_USBTV) += usbtv.o
diff --git a/drivers/media/usb/usbtv/usbtv.c b/drivers/media/usb/usbtv/usbtv.c
new file mode 100644
index 0000000..d165cb1
--- /dev/null
+++ b/drivers/media/usb/usbtv/usbtv.c
@@ -0,0 +1,723 @@
+/*
+ * Fushicai USBTV007 Video Grabber Driver
+ *
+ * Product web site:
+ * http://www.fushicai.com/products_detail/&productId=d05449ee-b690-42f9-a661-aa7353894bed.html
+ *
+ * Following LWN articles were very useful in construction of this driver:
+ * Video4Linux2 API series: http://lwn.net/Articles/203924/
+ * videobuf2 API explanation: http://lwn.net/Articles/447435/
+ * Thanks go to Jonathan Corbet for providing this quality documentation.
+ * He is awesome.
+ *
+ * Copyright (c) 2013 Lubomir Rintel
+ * All rights reserved.
+ * No physical hadrware was harmed running Windows during the
+ * reverse-engineering activity
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL").
+ */
+
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/usb.h>
+#include <linux/version.h>
+#include <linux/videodev2.h>
+
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+#include <media/videobuf2-core.h>
+#include <media/videobuf2-vmalloc.h>
+
+/* Hardware. */
+#define USBTV_VIDEO_ENDP	0x81
+#define USBTV_BASE		0xc000
+#define USBTV_REQUEST_REG	12
+
+/* Number of concurrent isochronous urbs submitted.
+ * Higher numbers was seen to overly saturate the USB bus. */
+#define USBTV_ISOC_TRANSFERS	16
+#define USBTV_ISOC_PACKETS	8
+
+#define USBTV_WIDTH		720
+#define USBTV_HEIGHT		480
+
+#define USBTV_CHUNK_SIZE	256
+#define USBTV_CHUNK		240
+#define USBTV_CHUNKS		(USBTV_WIDTH * USBTV_HEIGHT \
+					/ 2 / USBTV_CHUNK)
+
+/* Chunk header. */
+#define USBTV_MAGIC_OK(chunk)	((be32_to_cpu(chunk[0]) & 0xff000000) \
+							== 0x88000000)
+#define USBTV_FRAME_ID(chunk)	((be32_to_cpu(chunk[0]) & 0x00ff0000) >> 16)
+#define USBTV_ODD(chunk)	((be32_to_cpu(chunk[0]) & 0x0000f000) >> 15)
+#define USBTV_CHUNK_NO(chunk)	(be32_to_cpu(chunk[0]) & 0x00000fff)
+
+/* A single videobuf2 frame buffer. */
+struct usbtv_buf {
+	struct vb2_buffer vb;
+	struct list_head list;
+};
+
+/* Per-device structure. */
+struct usbtv {
+	struct device *dev;
+	struct usb_device *udev;
+	struct v4l2_device v4l2_dev;
+	struct video_device vdev;
+	struct vb2_queue vb2q;
+	struct mutex v4l2_lock;
+	struct mutex vb2q_lock;
+
+	/* List of videobuf2 buffers protected by a lock. */
+	spinlock_t buflock;
+	struct list_head bufs;
+
+	/* Number of currently processed frame, useful find
+	 * out when a new one begins. */
+	u32 frame_id;
+
+	int iso_size;
+	unsigned int sequence;
+	struct urb *isoc_urbs[USBTV_ISOC_TRANSFERS];
+};
+
+static int usbtv_setup_capture(struct usbtv *usbtv)
+{
+	int ret;
+	int pipe = usb_rcvctrlpipe(usbtv->udev, 0);
+	int i;
+	u16 protoregs[][2] = {
+		/* These seem to enable the device. */
+		{ USBTV_BASE + 0x0008, 0x0001 },
+		{ USBTV_BASE + 0x01d0, 0x00ff },
+		{ USBTV_BASE + 0x01d9, 0x0002 },
+
+		/* These seem to influence color parameters, such as
+		 * brightness, etc. */
+		{ USBTV_BASE + 0x0239, 0x0040 },
+		{ USBTV_BASE + 0x0240, 0x0000 },
+		{ USBTV_BASE + 0x0241, 0x0000 },
+		{ USBTV_BASE + 0x0242, 0x0002 },
+		{ USBTV_BASE + 0x0243, 0x0080 },
+		{ USBTV_BASE + 0x0244, 0x0012 },
+		{ USBTV_BASE + 0x0245, 0x0090 },
+		{ USBTV_BASE + 0x0246, 0x0000 },
+
+		{ USBTV_BASE + 0x0278, 0x002d },
+		{ USBTV_BASE + 0x0279, 0x000a },
+		{ USBTV_BASE + 0x027a, 0x0032 },
+		{ 0xf890, 0x000c },
+		{ 0xf894, 0x0086 },
+
+		{ USBTV_BASE + 0x00ac, 0x00c0 },
+		{ USBTV_BASE + 0x00ad, 0x0000 },
+		{ USBTV_BASE + 0x00a2, 0x0012 },
+		{ USBTV_BASE + 0x00a3, 0x00e0 },
+		{ USBTV_BASE + 0x00a4, 0x0028 },
+		{ USBTV_BASE + 0x00a5, 0x0082 },
+		{ USBTV_BASE + 0x00a7, 0x0080 },
+		{ USBTV_BASE + 0x0000, 0x0014 },
+		{ USBTV_BASE + 0x0006, 0x0003 },
+		{ USBTV_BASE + 0x0090, 0x0099 },
+		{ USBTV_BASE + 0x0091, 0x0090 },
+		{ USBTV_BASE + 0x0094, 0x0068 },
+		{ USBTV_BASE + 0x0095, 0x0070 },
+		{ USBTV_BASE + 0x009c, 0x0030 },
+		{ USBTV_BASE + 0x009d, 0x00c0 },
+		{ USBTV_BASE + 0x009e, 0x00e0 },
+		{ USBTV_BASE + 0x0019, 0x0006 },
+		{ USBTV_BASE + 0x008c, 0x00ba },
+		{ USBTV_BASE + 0x0101, 0x00ff },
+		{ USBTV_BASE + 0x010c, 0x00b3 },
+		{ USBTV_BASE + 0x01b2, 0x0080 },
+		{ USBTV_BASE + 0x01b4, 0x00a0 },
+		{ USBTV_BASE + 0x014c, 0x00ff },
+		{ USBTV_BASE + 0x014d, 0x00ca },
+		{ USBTV_BASE + 0x0113, 0x0053 },
+		{ USBTV_BASE + 0x0119, 0x008a },
+		{ USBTV_BASE + 0x013c, 0x0003 },
+		{ USBTV_BASE + 0x0150, 0x009c },
+		{ USBTV_BASE + 0x0151, 0x0071 },
+		{ USBTV_BASE + 0x0152, 0x00c6 },
+		{ USBTV_BASE + 0x0153, 0x0084 },
+		{ USBTV_BASE + 0x0154, 0x00bc },
+		{ USBTV_BASE + 0x0155, 0x00a0 },
+		{ USBTV_BASE + 0x0156, 0x00a0 },
+		{ USBTV_BASE + 0x0157, 0x009c },
+		{ USBTV_BASE + 0x0158, 0x001f },
+		{ USBTV_BASE + 0x0159, 0x0006 },
+		{ USBTV_BASE + 0x015d, 0x0000 },
+
+		{ USBTV_BASE + 0x0284, 0x0088 },
+		{ USBTV_BASE + 0x0003, 0x0004 },
+		{ USBTV_BASE + 0x001a, 0x0079 },
+		{ USBTV_BASE + 0x0100, 0x00d3 },
+		{ USBTV_BASE + 0x010e, 0x0068 },
+		{ USBTV_BASE + 0x010f, 0x009c },
+		{ USBTV_BASE + 0x0112, 0x00f0 },
+		{ USBTV_BASE + 0x0115, 0x0015 },
+		{ USBTV_BASE + 0x0117, 0x0000 },
+		{ USBTV_BASE + 0x0118, 0x00fc },
+		{ USBTV_BASE + 0x012d, 0x0004 },
+		{ USBTV_BASE + 0x012f, 0x0008 },
+		{ USBTV_BASE + 0x0220, 0x002e },
+		{ USBTV_BASE + 0x0225, 0x0008 },
+		{ USBTV_BASE + 0x024e, 0x0002 },
+		{ USBTV_BASE + 0x024f, 0x0001 },
+		{ USBTV_BASE + 0x0254, 0x005f },
+		{ USBTV_BASE + 0x025a, 0x0012 },
+		{ USBTV_BASE + 0x025b, 0x0001 },
+		{ USBTV_BASE + 0x0263, 0x001c },
+		{ USBTV_BASE + 0x0266, 0x0011 },
+		{ USBTV_BASE + 0x0267, 0x0005 },
+		{ USBTV_BASE + 0x024e, 0x0002 },
+		{ USBTV_BASE + 0x024f, 0x0002 },
+	};
+
+	for (i = 0; i < sizeof(protoregs)/sizeof(protoregs[0]); i++) {
+		u16 index = protoregs[i][0];
+		u16 value = protoregs[i][1];
+
+		ret = usb_control_msg(usbtv->udev, pipe, USBTV_REQUEST_REG,
+			USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+			value, index, NULL, 0, 0);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+/* Called for each 256-byte image chunk.
+ * First word identifies the chunk, followed by 240 words of image
+ * data and padding. */
+static void usbtv_image_chunk(struct usbtv *usbtv, u32 *chunk)
+{
+	int frame_id, odd, chunk_no;
+	u32 *frame;
+	struct usbtv_buf *buf;
+	unsigned long flags;
+
+	/* Ignore corrupted lines. */
+	if (!USBTV_MAGIC_OK(chunk))
+		return;
+	frame_id = USBTV_FRAME_ID(chunk);
+	odd = USBTV_ODD(chunk);
+	chunk_no = USBTV_CHUNK_NO(chunk);
+
+	/* Deinterlace. TODO: Use interlaced frame format. */
+	chunk_no = (chunk_no - chunk_no % 3) * 2 + chunk_no % 3;
+	chunk_no += !odd % 2 * 3;
+
+	if (chunk_no >= USBTV_CHUNKS)
+		return;
+
+	/* Beginning of a frame. */
+	if (chunk_no == 0)
+		usbtv->frame_id = frame_id;
+
+	spin_lock_irqsave(&usbtv->buflock, flags);
+	if (list_empty(&usbtv->bufs)) {
+		/* No free buffers. Userspace likely too slow. */
+		spin_unlock_irqrestore(&usbtv->buflock, flags);
+		return;
+	}
+
+	/* First available buffer. */
+	buf = list_first_entry(&usbtv->bufs, struct usbtv_buf, list);
+	frame = vb2_plane_vaddr(&buf->vb, 0);
+
+	/* Copy the chunk. */
+	memcpy(&frame[chunk_no * USBTV_CHUNK], &chunk[1],
+			USBTV_CHUNK * sizeof(chunk[1]));
+
+	/* Last chunk in a frame, signalling an end */
+	if (usbtv->frame_id && chunk_no == USBTV_CHUNKS-1) {
+		int size = vb2_plane_size(&buf->vb, 0);
+
+		buf->vb.v4l2_buf.field = V4L2_FIELD_NONE;
+		buf->vb.v4l2_buf.sequence = usbtv->sequence++;
+		vb2_set_plane_payload(&buf->vb, 0, size);
+		vb2_buffer_done(&buf->vb, VB2_BUF_STATE_DONE);
+		list_del(&buf->list);
+	}
+
+	spin_unlock_irqrestore(&usbtv->buflock, flags);
+}
+
+/* Got image data. Each packet contains a number of 256-word chunks we
+ * compose the image from. */
+static void usbtv_iso_cb(struct urb *ip)
+{
+	int ret;
+	int i;
+	struct usbtv *usbtv = (struct usbtv *)ip->context;
+
+	switch (ip->status) {
+	/* All fine. */
+	case 0:
+		break;
+	/* Device disconnected or capture stopped? */
+	case -ENODEV:
+	case -ENOENT:
+	case -ECONNRESET:
+	case -ESHUTDOWN:
+		return;
+	/* Unknown error. Retry. */
+	default:
+		dev_warn(usbtv->dev, "Bad response for ISO request.\n");
+		goto resubmit;
+	}
+
+	for (i = 0; i < ip->number_of_packets; i++) {
+		int size = ip->iso_frame_desc[i].actual_length;
+		unsigned char *data = ip->transfer_buffer +
+				ip->iso_frame_desc[i].offset;
+		int offset;
+
+		for (offset = 0; USBTV_CHUNK_SIZE * offset < size; offset++)
+			usbtv_image_chunk(usbtv,
+				(u32 *)&data[USBTV_CHUNK_SIZE * offset]);
+	}
+
+resubmit:
+	ret = usb_submit_urb(ip, GFP_ATOMIC);
+	if (ret < 0)
+		dev_warn(usbtv->dev, "Could not resubmit ISO URB\n");
+}
+
+static struct urb *usbtv_setup_iso_transfer(struct usbtv *usbtv)
+{
+	struct urb *ip;
+	int size = usbtv->iso_size;
+	int i;
+
+	ip = usb_alloc_urb(USBTV_ISOC_PACKETS, GFP_KERNEL);
+	if (ip == NULL)
+		return NULL;
+
+	ip->dev = usbtv->udev;
+	ip->context = usbtv;
+	ip->pipe = usb_rcvisocpipe(usbtv->udev, USBTV_VIDEO_ENDP);
+	ip->interval = 1;
+	ip->transfer_flags = URB_ISO_ASAP;
+	ip->transfer_buffer = kzalloc(size * USBTV_ISOC_PACKETS,
+						GFP_KERNEL);
+	ip->complete = usbtv_iso_cb;
+	ip->number_of_packets = USBTV_ISOC_PACKETS;
+	ip->transfer_buffer_length = size * USBTV_ISOC_PACKETS;
+	for (i = 0; i < USBTV_ISOC_PACKETS; i++) {
+		ip->iso_frame_desc[i].offset = size * i;
+		ip->iso_frame_desc[i].length = size;
+	}
+
+	return ip;
+}
+
+static void usbtv_stop(struct usbtv *usbtv)
+{
+	int i;
+	unsigned long flags;
+
+	/* Cancel running transfers. */
+	for (i = 0; i < USBTV_ISOC_TRANSFERS; i++) {
+		struct urb *ip = usbtv->isoc_urbs[i];
+		if (ip == NULL)
+			continue;
+		usb_kill_urb(ip);
+		kfree(ip->transfer_buffer);
+		usb_free_urb(ip);
+		usbtv->isoc_urbs[i] = NULL;
+	}
+
+	/* Return buffers to userspace. */
+	spin_lock_irqsave(&usbtv->buflock, flags);
+	while (!list_empty(&usbtv->bufs)) {
+		struct usbtv_buf *buf = list_first_entry(&usbtv->bufs,
+						struct usbtv_buf, list);
+		vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
+		list_del(&buf->list);
+	}
+	spin_unlock_irqrestore(&usbtv->buflock, flags);
+}
+
+static int usbtv_start(struct usbtv *usbtv)
+{
+	int i;
+	int ret;
+
+	ret = usb_set_interface(usbtv->udev, 0, 0);
+	if (ret < 0)
+		return ret;
+
+	ret = usbtv_setup_capture(usbtv);
+	if (ret < 0)
+		return ret;
+
+	ret = usb_set_interface(usbtv->udev, 0, 1);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < USBTV_ISOC_TRANSFERS; i++) {
+		struct urb *ip;
+
+		ip = usbtv_setup_iso_transfer(usbtv);
+		if (ip == NULL) {
+			ret = -ENOMEM;
+			goto start_fail;
+		}
+		usbtv->isoc_urbs[i] = ip;
+
+		ret = usb_submit_urb(ip, GFP_KERNEL);
+		if (ret < 0)
+			goto start_fail;
+	}
+
+	return 0;
+
+start_fail:
+	usbtv_stop(usbtv);
+	return ret;
+}
+
+struct usb_device_id usbtv_id_table[] = {
+	{ USB_DEVICE(0x1b71, 0x3002) },
+	{}
+};
+MODULE_DEVICE_TABLE(usb, usbtv_id_table);
+
+static int usbtv_querycap(struct file *file, void *priv,
+				struct v4l2_capability *cap)
+{
+	struct usbtv *dev = video_drvdata(file);
+
+	strncpy(cap->driver, "usbtv", sizeof(cap->driver));
+	strncpy(cap->card, "usbtv", sizeof(cap->card));
+	usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
+	cap->device_caps = V4L2_CAP_VIDEO_CAPTURE;
+	cap->device_caps |= V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
+	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
+	return 0;
+}
+
+static int usbtv_enum_input(struct file *file, void *priv,
+					struct v4l2_input *i)
+{
+	if (i->index > 0)
+		return -EINVAL;
+
+	strncpy(i->name, "Composite", sizeof(i->name));
+	i->type = V4L2_INPUT_TYPE_CAMERA;
+	i->std = V4L2_STD_525_60;
+	return 0;
+}
+
+static int usbtv_enum_fmt_vid_cap(struct file *file, void  *priv,
+					struct v4l2_fmtdesc *f)
+{
+	if (f->index > 0)
+		return -EINVAL;
+
+	strncpy(f->description, "16 bpp YUY2, 4:2:2, packed",
+					sizeof(f->description));
+	f->pixelformat = V4L2_PIX_FMT_YUYV;
+	return 0;
+}
+
+static int usbtv_g_fmt_vid_cap(struct file *file, void *priv,
+					struct v4l2_format *f)
+{
+	f->fmt.pix.width = USBTV_WIDTH;
+	f->fmt.pix.height = USBTV_HEIGHT;
+	f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
+	f->fmt.pix.field = V4L2_FIELD_NONE;
+	f->fmt.pix.bytesperline = USBTV_WIDTH * 2;
+	f->fmt.pix.sizeimage = (f->fmt.pix.bytesperline * f->fmt.pix.height);
+	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
+	return 0;
+}
+
+static int usbtv_try_fmt_vid_cap(struct file *file, void *priv,
+					struct v4l2_format *f)
+{
+	return usbtv_g_fmt_vid_cap(file, priv, f);
+}
+
+static int usbtv_s_fmt_vid_cap(struct file *file, void *priv,
+					struct v4l2_format *f)
+{
+	return usbtv_try_fmt_vid_cap(file, priv, f);
+}
+
+static int usbtv_g_std(struct file *file, void *priv, v4l2_std_id *norm)
+{
+	*norm = V4L2_STD_525_60;
+	return 0;
+}
+
+static int usbtv_g_input(struct file *file, void *priv, unsigned int *i)
+{
+	*i = 0;
+	return 0;
+}
+
+static int usbtv_s_input(struct file *file, void *priv, unsigned int i)
+{
+	if (i > 0)
+		return -EINVAL;
+	return 0;
+}
+
+static int usbtv_s_std(struct file *file, void *priv, v4l2_std_id norm)
+{
+	if (norm & V4L2_STD_525_60)
+		return 0;
+	return -EINVAL;
+}
+
+static int usbtv_queryctrl(struct file *file, void *priv,
+				struct v4l2_queryctrl *ctrl)
+{
+	return -EINVAL;
+}
+
+struct v4l2_ioctl_ops usbtv_ioctl_ops = {
+	.vidioc_querycap = usbtv_querycap,
+	.vidioc_enum_input = usbtv_enum_input,
+	.vidioc_enum_fmt_vid_cap = usbtv_enum_fmt_vid_cap,
+	.vidioc_g_fmt_vid_cap = usbtv_g_fmt_vid_cap,
+	.vidioc_try_fmt_vid_cap = usbtv_try_fmt_vid_cap,
+	.vidioc_s_fmt_vid_cap = usbtv_s_fmt_vid_cap,
+	.vidioc_g_std = usbtv_g_std,
+	.vidioc_s_std = usbtv_s_std,
+	.vidioc_g_input = usbtv_g_input,
+	.vidioc_s_input = usbtv_s_input,
+	.vidioc_queryctrl = usbtv_queryctrl,
+
+	.vidioc_reqbufs = vb2_ioctl_reqbufs,
+	.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
+	.vidioc_querybuf = vb2_ioctl_querybuf,
+	.vidioc_qbuf = vb2_ioctl_qbuf,
+	.vidioc_dqbuf = vb2_ioctl_dqbuf,
+	.vidioc_streamon = vb2_ioctl_streamon,
+	.vidioc_streamoff = vb2_ioctl_streamoff,
+};
+
+struct v4l2_file_operations usbtv_fops = {
+	.owner = THIS_MODULE,
+	.unlocked_ioctl = video_ioctl2,
+	.mmap = vb2_fop_mmap,
+	.open = v4l2_fh_open,
+	.release = vb2_fop_release,
+	.read = vb2_fop_read,
+	.poll = vb2_fop_poll,
+};
+
+static int usbtv_queue_setup(struct vb2_queue *vq,
+	const struct v4l2_format *v4l_fmt, unsigned int *nbuffers,
+	unsigned int *nplanes, unsigned int sizes[], void *alloc_ctxs[])
+{
+	if (*nbuffers == 0)
+		*nbuffers = 8;
+	*nplanes = 1;
+	sizes[0] = USBTV_CHUNK * USBTV_CHUNKS * sizeof(u32);
+
+	return 0;
+}
+
+static void usbtv_buf_queue(struct vb2_buffer *vb)
+{
+	struct usbtv *usbtv = vb2_get_drv_priv(vb->vb2_queue);
+	struct usbtv_buf *buf = container_of(vb, struct usbtv_buf, vb);
+	unsigned long flags;
+
+	if (usbtv->udev == NULL) {
+		vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
+		return;
+	}
+
+	spin_lock_irqsave(&usbtv->buflock, flags);
+	list_add_tail(&buf->list, &usbtv->bufs);
+	spin_unlock_irqrestore(&usbtv->buflock, flags);
+}
+
+static int usbtv_start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+	struct usbtv *usbtv = vb2_get_drv_priv(vq);
+	int ret;
+
+	if (mutex_lock_interruptible(&usbtv->v4l2_lock))
+		return -ERESTARTSYS;
+	if (usbtv->udev == NULL) {
+		mutex_unlock(&usbtv->v4l2_lock);
+		return -ENODEV;
+	}
+
+	ret = usbtv_start(usbtv);
+	mutex_unlock(&usbtv->v4l2_lock);
+	return ret;
+}
+
+static int usbtv_stop_streaming(struct vb2_queue *vq)
+{
+	struct usbtv *usbtv = vb2_get_drv_priv(vq);
+
+	if (mutex_lock_interruptible(&usbtv->v4l2_lock))
+		return -ERESTARTSYS;
+	if (usbtv->udev == NULL) {
+		mutex_unlock(&usbtv->v4l2_lock);
+		return -ENODEV;
+	}
+
+	usbtv_stop(usbtv);
+	mutex_unlock(&usbtv->v4l2_lock);
+	return 0;
+}
+
+struct vb2_ops usbtv_vb2_ops = {
+	.queue_setup = usbtv_queue_setup,
+	.buf_queue = usbtv_buf_queue,
+	.start_streaming = usbtv_start_streaming,
+	.stop_streaming = usbtv_stop_streaming,
+};
+
+static void usbtv_release(struct v4l2_device *v4l2_dev)
+{
+	struct usbtv *usbtv = container_of(v4l2_dev, struct usbtv, v4l2_dev);
+
+	v4l2_device_unregister(&usbtv->v4l2_dev);
+	vb2_queue_release(&usbtv->vb2q);
+	kfree(usbtv);
+}
+
+static int usbtv_probe(struct usb_interface *intf,
+	const struct usb_device_id *id)
+{
+	int ret;
+	int size;
+	struct device *dev = &intf->dev;
+	struct usbtv *usbtv;
+
+	/* Checks that the device is what we think it is. */
+	if (intf->num_altsetting != 2)
+		return -ENODEV;
+	if (intf->altsetting[1].desc.bNumEndpoints != 4)
+		return -ENODEV;
+
+	/* Packet size is split into 11 bits of base size and count of
+	 * extra multiplies of it.*/
+	size = usb_endpoint_maxp(&intf->altsetting[1].endpoint[0].desc);
+	size = (size & 0x07ff) * (((size & 0x1800) >> 11) + 1);
+
+	/* Device structure */
+	usbtv = kzalloc(sizeof(struct usbtv), GFP_KERNEL);
+	if (usbtv == NULL)
+		return -ENOMEM;
+	usbtv->dev = dev;
+	usbtv->udev = usb_get_dev(interface_to_usbdev(intf));
+	usbtv->iso_size = size;
+	spin_lock_init(&usbtv->buflock);
+	mutex_init(&usbtv->v4l2_lock);
+	mutex_init(&usbtv->vb2q_lock);
+	INIT_LIST_HEAD(&usbtv->bufs);
+
+	/* videobuf2 structure */
+	usbtv->vb2q.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	usbtv->vb2q.io_modes = VB2_MMAP | VB2_USERPTR | VB2_READ;
+	usbtv->vb2q.drv_priv = usbtv;
+	usbtv->vb2q.buf_struct_size = sizeof(struct usbtv_buf);
+	usbtv->vb2q.ops = &usbtv_vb2_ops;
+	usbtv->vb2q.mem_ops = &vb2_vmalloc_memops;
+	usbtv->vb2q.timestamp_type = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+	usbtv->vb2q.lock = &usbtv->vb2q_lock;
+	ret = vb2_queue_init(&usbtv->vb2q);
+	if (ret < 0) {
+		dev_warn(dev, "Could not initialize videobuf2 queue\n");
+		goto usbtv_fail;
+	}
+
+	/* v4l2 structure */
+	usbtv->v4l2_dev.release = usbtv_release;
+	ret = v4l2_device_register(dev, &usbtv->v4l2_dev);
+	if (ret < 0) {
+		dev_warn(dev, "Could not register v4l2 device\n");
+		goto v4l2_fail;
+	}
+
+	usb_set_intfdata(intf, usbtv);
+
+	/* Video structure */
+	strncpy(usbtv->vdev.name, "usbtv", sizeof(usbtv->vdev.name));
+	usbtv->vdev.v4l2_dev = &usbtv->v4l2_dev;
+	usbtv->vdev.release = video_device_release_empty;
+	usbtv->vdev.fops = &usbtv_fops;
+	usbtv->vdev.ioctl_ops = &usbtv_ioctl_ops;
+	usbtv->vdev.tvnorms = V4L2_STD_525_60;
+	usbtv->vdev.queue = &usbtv->vb2q;
+	usbtv->vdev.lock = &usbtv->v4l2_lock;
+	ret = video_register_device(&usbtv->vdev, VFL_TYPE_GRABBER, -1);
+	if (ret < 0) {
+		dev_warn(dev, "Could not register video device\n");
+		goto vdev_fail;
+	}
+	video_set_drvdata(&usbtv->vdev, usbtv);
+
+	dev_info(dev, "Fushicai USBTV007 Video Grabber Driver\n");
+	return 0;
+
+vdev_fail:
+	v4l2_device_unregister(&usbtv->v4l2_dev);
+v4l2_fail:
+	vb2_queue_release(&usbtv->vb2q);
+usbtv_fail:
+	kfree(usbtv);
+
+	return ret;
+}
+
+static void usbtv_disconnect(struct usb_interface *intf)
+{
+	struct usbtv *usbtv = usb_get_intfdata(intf);
+
+	mutex_lock(&usbtv->vb2q_lock);
+	mutex_lock(&usbtv->v4l2_lock);
+
+	usbtv_stop(usbtv);
+	usb_set_intfdata(intf, NULL);
+	video_unregister_device(&usbtv->vdev);
+	v4l2_device_disconnect(&usbtv->v4l2_dev);
+	usb_put_dev(usbtv->udev);
+	usbtv->udev = NULL;
+
+	mutex_unlock(&usbtv->v4l2_lock);
+	mutex_unlock(&usbtv->vb2q_lock);
+
+	v4l2_device_put(&usbtv->v4l2_dev);
+}
+
+MODULE_AUTHOR("Lubomir Rintel");
+MODULE_DESCRIPTION("Fushicai USBTV007 Video Grabber Driver");
+MODULE_LICENSE("Dual BSD/GPL");
+
+struct usb_driver usbtv_usb_driver = {
+	.name = "usbtv",
+	.id_table = usbtv_id_table,
+	.probe = usbtv_probe,
+	.disconnect = usbtv_disconnect,
+};
+
+module_usb_driver(usbtv_usb_driver);
-- 
1.7.1

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