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    Subject[PATCH] [media] usbtv: Add driver for Fushicai USBTV007 video frame grabber
    Date
    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@v3.sk>
    Cc: Mauro Carvalho Chehab <mchehab@redhat.com>
    Cc: linux-kernel@vger.kernel.org
    Cc: linux-media@vger.kernel.org
    ---
    Changes for v2:
    - Fix a typo in comment
    - Make prototype register settings static const
    - Solve parity calculation weirdness
    - Attempt to fix interlacing
    - Add timestamp to frames
    - [v4l2-compliance] Set pix format priv to 0
    - Drop usbtv_*_fmt_vid_cap code duplication
    - [v4l2-compliance] Add vidioc_create_bufs
    - [v4l2-compliance] Use file handle priorities
    - Drop "Driver" from initial dev_info

    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 | 715 ++++++++++++++++++++++++++++++++++++++
    5 files changed, 728 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..c2a02c2
    --- /dev/null
    +++ b/drivers/media/usb/usbtv/usbtv.c
    @@ -0,0 +1,715 @@
    +/*
    + * 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 < 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 * 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);
    +
    + 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_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;
    +}
    +
    +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_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_queryctrl = usbtv_queryctrl,
    +
    + .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 == 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;
    + set_bit(V4L2_FL_USE_FH_PRIO, &usbtv->vdev.flags);
    + 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\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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