[media] usbtv: Add driver for Fushicai USBTV007 video frame grabber (f3d27f34) · Commits · e / devices / android_kernel_fairphone_FP5

drivers/media/usb/Kconfig

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Original line number	Original line	Diff line number	Diff line
	@@ -18,6 +18,7 @@ source "drivers/media/usb/zr364xx/Kconfig"
	source "drivers/media/usb/stkwebcam/Kconfig"		source "drivers/media/usb/stkwebcam/Kconfig"
	source "drivers/media/usb/s2255/Kconfig"		source "drivers/media/usb/s2255/Kconfig"
	source "drivers/media/usb/sn9c102/Kconfig"		source "drivers/media/usb/sn9c102/Kconfig"
			source "drivers/media/usb/usbtv/Kconfig"
	endif		endif

	if MEDIA_ANALOG_TV_SUPPORT		if MEDIA_ANALOG_TV_SUPPORT

drivers/media/usb/Makefile

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Original line number	Original line	Diff line number	Diff line
	@@ -20,3 +20,4 @@ obj-$(CONFIG_VIDEO_STK1160) += stk1160/
	obj-$(CONFIG_VIDEO_CX231XX) += cx231xx/		obj-$(CONFIG_VIDEO_CX231XX) += cx231xx/
	obj-$(CONFIG_VIDEO_TM6000) += tm6000/		obj-$(CONFIG_VIDEO_TM6000) += tm6000/
	obj-$(CONFIG_VIDEO_EM28XX) += em28xx/		obj-$(CONFIG_VIDEO_EM28XX) += em28xx/
			obj-$(CONFIG_VIDEO_USBTV) += usbtv/

drivers/media/usb/usbtv/Kconfig

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			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

drivers/media/usb/usbtv/Makefile

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Original line number	Original line	Diff line number	Diff line
			obj-$(CONFIG_VIDEO_USBTV) += usbtv.o

drivers/media/usb/usbtv/usbtv.c

0 → 100644

+696 −0

Original line number	Original line	Diff line number	Diff line
			/*
			* 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 hardware 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;
			static const 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 < ARRAY_SIZE(protoregs); 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 * 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_INTERLACED;
			buf->vb.v4l2_buf.sequence = usbtv->sequence++;
			v4l2_get_timestamp(&buf->vb.v4l2_buf.timestamp);
			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);

			strlcpy(cap->driver, "usbtv", sizeof(cap->driver));
			strlcpy(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;

			strlcpy(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;

			strlcpy(f->description, "16 bpp YUY2, 4:2:2, packed",
			sizeof(f->description));
			f->pixelformat = V4L2_PIX_FMT_YUYV;
			return 0;
			}

			static int usbtv_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_INTERLACED;
			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;
			f->fmt.pix.priv = 0;
			return 0;
			}

			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;
			}

			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_fmt_vid_cap,
			.vidioc_try_fmt_vid_cap = usbtv_fmt_vid_cap,
			.vidioc_s_fmt_vid_cap = usbtv_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_reqbufs = vb2_ioctl_reqbufs,
			.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
			.vidioc_querybuf = vb2_ioctl_querybuf,
			.vidioc_create_bufs = vb2_ioctl_create_bufs,
			.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 < 2)
			*nbuffers = 2;
			*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);

			if (usbtv->udev == NULL)
			return -ENODEV;

			return usbtv_start(usbtv);
			}

			static int usbtv_stop_streaming(struct vb2_queue *vq)
			{
			struct usbtv *usbtv = vb2_get_drv_priv(vq);

			if (usbtv->udev == NULL)
			return -ENODEV;

			usbtv_stop(usbtv);
			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 */
			strlcpy(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;
			set_bit(V4L2_FL_USE_FH_PRIO, &usbtv->vdev.flags);
			video_set_drvdata(&usbtv->vdev, usbtv);
			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;
			}

			dev_info(dev, "Fushicai USBTV007 Video Grabber\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);