OTG102

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The page is to describe and provide information for a device called EZgrabber2 which appears to be produced Mygica and Geniatech.

Ezgrabber2-mygica.3.jpg
Ezgrabber2-mygica.2.jpg
EZGrabber2-mygica.1.jpg
Ezgrabber2-geniatech.jpg


Overview/Features

The EZGrabber2 device shares the Windows drivers for the similar devices Capit and EZGrabber, so likely much of the information will be in common with those. Please clarify if you have any of these products:

MyGica/Geniatech USB EZGrabber2 and similar analog video capture cards
Device Product url(s) USB ID Chipset
EZGrabber2 Mygica and Geniatech 1f4d:0102

0572:58a3 (not verified, see below)

CX78921-11z, compatible with cx231xx Linux framework
EZGrabber My Gica EZGrabber ? ?
Capit MyGica Capit MyGica Capit Old site Geniatech ? ?

Supposedly supports output of compressed MPEG1/2/4 stream(on Windows). On Linux, using a patched cx231xx driver, it is at least possible to get uncompressed YUV4:2:2 video and 48000Hz stereo through the corresponding alsa device.

It has the standard USB 2.0 interface with stereo, composite video and S-video inputs.

Components Used

The single chip on the board is labeled as CX78921-11z. There is no reference to this chip on Conexant's website nor practically any the entire internet, so likely this is just a renumbered chip for these specific vendors. However the indication that it can output compressed MPEG4 video does suggest that it is not a standard cx23100/1/2.

However examining the Windows drivers provided by the vendors, they refer to the device Polaris.CVBS or POLARIS.OTG102, and contain many of the same driver files as other devices containing the cx23100/1/2 chips .

Images

Front side of board
Back side of board

Making it work

We need to add the device definition and some related details to the cx231xx driver and have installed the appropriate firmware (see below). Also we need to have built and load the kernel modules for cx25840 and cx231xx before plugging in the device (#modprobe cx25840;modprobe cx231xx). If I don't do this, the cx231xx module will autoload on detecting the device, but the cx25840 module will not autoload, and the device doesn't function.


The following is a patch against a kernel source 3.6. It should be fairly applicable to sources from 2.6.32 on through 3.7, with the possible note of the device number in cx2311.h. Note that in 3.8 and presumably onwards, the structure of the drivers/media/ directory has been changed and no longer is there a drivers/media/video directory, but rather the video drivers are regrouped by interface (usb, pci), so the cx231xx drivers are under drivers/media/usb/cx231xx while the related and also needed driver for the cx25840 is under drivers/media/pci/.

The has also been a lot of recent (early 2013) patches submitted to patchwork.kernel.org/project/linux-media that may require subsequent modifications. A patch for this device has been submitted and will hopefully be pulled into to 3.9 or following kernel.

Kernel Patch

I'll also post a downloadable patch. Until then, and for posterity, the text is below.

diff -uprN linux-3.6/drivers/media/video/cx231xx/cx231xx-avcore.c linux-3.6.new/drivers/media/video/cx231xx/cx231xx-avcore.c
--- linux-3.6/drivers/media/video/cx231xx/cx231xx-avcore.c	2012-09-30 17:47:46.000000000 -0600
+++ linux-3.6.new/drivers/media/video/cx231xx/cx231xx-avcore.c	2013-02-26 19:58:51.096793077 -0700
@@ -352,6 +352,7 @@ int cx231xx_afe_update_power_control(str
 	case CX231XX_BOARD_CNXT_RDE_253S:
 	case CX231XX_BOARD_CNXT_RDU_253S:
 	case CX231XX_BOARD_CNXT_VIDEO_GRABBER:
+	case CX231XX_BOARD_OTG102:
 	case CX231XX_BOARD_HAUPPAUGE_EXETER:
 	case CX231XX_BOARD_HAUPPAUGE_USBLIVE2:
 	case CX231XX_BOARD_PV_PLAYTV_USB_HYBRID:
@@ -1719,6 +1720,7 @@ int cx231xx_dif_set_standard(struct cx23
 	case CX231XX_BOARD_CNXT_SHELBY:
 	case CX231XX_BOARD_CNXT_RDU_250:
 	case CX231XX_BOARD_CNXT_VIDEO_GRABBER:
+	case CX231XX_BOARD_OTG102:
 	case CX231XX_BOARD_HAUPPAUGE_EXETER:
 		func_mode = 0x03;
 		break;
diff -uprN linux-3.6/drivers/media/video/cx231xx/cx231xx-cards.c linux-3.6.new/drivers/media/video/cx231xx/cx231xx-cards.c
--- linux-3.6/drivers/media/video/cx231xx/cx231xx-cards.c	2012-09-30 17:47:46.000000000 -0600
+++ linux-3.6.new/drivers/media/video/cx231xx/cx231xx-cards.c	2013-02-28 12:23:58.925869674 -0700
@@ -280,6 +280,37 @@ struct cx231xx_board cx231xx_boards[] =
 			}
 		},
 	},
+	[CX231XX_BOARD_OTG102] = {
+                .name = "Geniatech OTG102",
+                .tuner_type = TUNER_ABSENT,
+                .decoder = CX231XX_AVDECODER,
+                .output_mode = OUT_MODE_VIP11,
+                .ctl_pin_status_mask = 0xFFFFFFC4,
+                .agc_analog_digital_select_gpio = 0x0c, /* According with PV CxPlrCAP.inf file */
+                .gpio_pin_status_mask = 0x4001000,
+                .norm = V4L2_STD_NTSC,
+                .no_alt_vanc = 1,
+                .external_av = 1,
+                .dont_use_port_3 = 1,
+		//.has_417 = 1,
+		/* this board has hardware encoding chip supporting mpeg1/2/4, but as the 417 is apparently not working for the
+		   reference board it is not on this one either. building the driver with this option and then loading the module
+		   creates a second video device node, but nothing comes out of it.  */
+                .input = {{
+                                .type = CX231XX_VMUX_COMPOSITE1,
+                                .vmux = CX231XX_VIN_2_1,
+                                .amux = CX231XX_AMUX_LINE_IN,
+                                .gpio = NULL,
+                        }, {
+                                .type = CX231XX_VMUX_SVIDEO,
+                                .vmux = CX231XX_VIN_1_1 |
+                                        (CX231XX_VIN_1_2 << 8) |
+                                        CX25840_SVIDEO_ON,
+                                .amux = CX231XX_AMUX_LINE_IN,
+                                .gpio = NULL,
+                        }
+                },
+        },
 	[CX231XX_BOARD_CNXT_RDE_250] = {
 		.name = "Conexant Hybrid TV - rde 250",
 		.tuner_type = TUNER_XC5000,
@@ -620,6 +651,8 @@ struct usb_device_id cx231xx_id_table[]
 	 .driver_info = CX231XX_BOARD_CNXT_RDU_253S},
 	{USB_DEVICE(0x0572, 0x58A6),
 	 .driver_info = CX231XX_BOARD_CNXT_VIDEO_GRABBER},
+	{USB_DEVICE(0x1F4D, 0x0102),
+	 .driver_info = CX231XX_BOARD_OTG102},
 	{USB_DEVICE(0x0572, 0x589E),
 	 .driver_info = CX231XX_BOARD_CNXT_RDE_250},
 	{USB_DEVICE(0x0572, 0x58A0),

diff -uprN linux-3.6/drivers/media/video/cx231xx/cx231xx.h linux-3.6.new/drivers/media/video/cx231xx/cx231xx.h
--- linux-3.6/drivers/media/video/cx231xx/cx231xx.h	2012-09-30 17:47:46.000000000 -0600
+++ linux-3.6.new/drivers/media/video/cx231xx/cx231xx.h	2013-02-26 16:01:58.924653199 -0700
@@ -68,6 +68,7 @@
 #define CX231XX_BOARD_ICONBIT_U100 13
 #define CX231XX_BOARD_HAUPPAUGE_USB2_FM_PAL 14
 #define CX231XX_BOARD_HAUPPAUGE_USB2_FM_NTSC 15
+#define CX231XX_BOARD_OTG102 16
 
 /* Limits minimum and default number of buffers */
 #define CX231XX_MIN_BUF                 4

Firmware

Like for many similar devices of various chipsets, a firmware image or images are required that the driver uploads to the device. These are often closed source binary blobs under unclear license as far as their redistributeability. To further complicate matters, there are various versions of these firmwares with the same name that are not (always) cross-compatible. To complicate matters even further, there is apparently a mix-up one of the firmware files distrusted though linuxtv.org and linux-firmware.git. See [1] and especially [2] for more information.

I have these in my /lib/firmware folder. These came from [3]. The Geniatech driver also contains a firmware image called cx416enc.rom which is very similar to the v4l-cx23885-enc.fw file (which is a renamed hcw85enc.rom from the HVR1800 driver).


   16382 Jun 22  2010 /lib/firmware/v4l-cx231xx-avcore-01.fw  (loads, but driver still works even without)  
   16382 Feb 27 17:49 /lib/firmware/v4l-cx23885-avcore-01.fw  (not needed here?)
  376836 Feb 25 22:23 /lib/firmware/v4l-cx23885-enc.fw        (not needed here?)
   16382 Jun 22  2010 /lib/firmware/v4l-cx25840.fw



#md5sum /lib/firmware/v4l-cx2*
a9f8f5d901a7fb42f552e1ee6384f3bb  /lib/firmware/v4l-cx231xx-avcore-01.fw
a9f8f5d901a7fb42f552e1ee6384f3bb  /lib/firmware/v4l-cx23885-avcore-01.fw 
1cb3c48a6684126f5e503a434f2d636b  /lib/firmware/v4l-cx23885-enc.fw
dadb79e9904fc8af96e8111d9cb59320  /lib/firmware/v4l-cx25840.fw

Usage

Live Viewing

  • mplayer tv:// -tv driver=v4l2:device=/dev/video0:norm=0:alsa:adevice=hw.1:forceaudio:volume=100
  • mplayer tv:// -tv driver=v4l2:device=/dev/video0:norm=0:alsa:adevice=hw.1:forceaudio:volume=100:immediatemode=0:width=720

Encoding

  • with mencoder, x264 video, mp3 audio, mp4 container (eg for computer viewing)
    • mencoder tv:// -tv driver=v4l2:device=/dev/video0:norm=NTSC:alsa:adevice=hw.1:forceaudio:volume=80:immediatemode=0 -oac lavc -lavcopts acodec=libmp3lame:abitrate=192 -srate 48000 -ovc x264 -x264encopts global_header:nr=200:threads=auto:frameref=4:subq=4:8x8dct:crf=25:trellis=1:keyint=1000:keyint_min=10:bframes=16:b-adapt=1:b_pyramid=normal -of lavf -lavfopts format=mp4 -o test.mp4
  • with mencoder, mpeg2 video, ac3audio, mpeg2 container (eg for dvd transfer)
    • mencoder tv:// -tv driver=v4l2:device=/dev/video0:norm=NTSC:alsa:adevice=hw.1:forceaudio:volume=80:immediatemode=0:width=640 -of mpeg -mpegopts format=dvd:vaspect=4/3:vframerate=30 -ofps 30000/1001 -ovc lavc -oac lavc -lavcopts vcodec=mpeg2video:vrc_buf_size=1835:keyint=18:vbitrate=9000:vrc_maxrate=9800:acodec=ac3:abitrate=192:aspect=4/3 -o test.mpg
  • some possibly useful video filters see FILTERS mplayer man page for more
    • -vf crop=w:h:x:y,scale=-2:480,expand=640:480
      • crop video to specified width:height at position x:y, to remove fuzzy edges or unwanted parts of image, then scale to standard height and expand to standard width (puts black bars on side of image, but maybe helpful for DVD player compatibility)
    • -vf pp=ci,hqdn3d
      • deinterlace with cubic interpolation, apply high quality denoise3d

Problems with audio

If mplayer etc. reports that the audio device is busy "error opening audio: Device or resource busy" and you are using pulseaudio, disable pulseaudio's control of the device, eg in pavucontrol (Pulse Audio Volume Control) under configuration, set the Cx231xx Audio device to be off. This will allow other programs to access the resource through the alsa device.

Problems with interference

Probably not specific to this board, but as a general note: I was initially getting frequent green lines (of about 1 line thickness) that ran across the image once every 0.5 to 3 seconds. I attributed this to some interference on the video feed, however changing cables did not help. I was especially stumped once the same pattern of interference occurred on the s-video input. Then I moved the device to a rear USB port on the motherboard instead of the front which it had been placed on. That solved the problem. Apparently the cable running from the motherboard header to the front USB ports on case was the source of interference, and it was on the USB output side rather than the video input.


Notes about the Windows drivers

I purchased an EZGrabber2 from Meritline early February 2013. It was the MyGica variant although the product page links to the Geniatech driver and software.

MyGica provides drivers at ezgrabber2driver.zip and otg103driver.zip (for the Capit) , both are the exact same file.


Geniatech lists a single driver for the EzGrabber/EzGrabber2/Capit products, ezgrabber2driver.zip.


MyGica

The install .inf file from the MyGica driver is called CxPlrCap.inf and contains the following device definitions:

[Maxytech]
%CXPOLARIS_NAME.OTG102%      =POLARIS.OTG102,  USB\VID_1F4D&PID_0102&MI_01
%CXPOLARIS_NAME.U237%        =POLARIS.U237,    USB\VID_1F4D&PID_0237&MI_01
%CXPOLARIS_NAME.OTG102CIR%   =POLARIS.CIR,     USB\VID_1F4D&PID_0102&MI_00

The driver directory contains the following files:

  23678 Oct 28  2009 CxPlrCap.inf
 187776 Jan  6  2010 CxPlrCap.sys
  29184 Sep  8  2009 CxPolaris.ax
  18432 Sep  8  2009 cpnotify.ax
  10154 Jan  7  2010 cxplrcap.cat
  24576 Sep  8  2009 cxtvrate.dll
    336 Sep 24  2009 maxcir.bin
   8404 Jan  7  2010 maxcir.cat
   1440 Sep 17  2009 maxcir.inf
  32256 Oct  9  2009 maxcir.sys
  16382 Jan 20  2009 merlinD.bin
  28672 Sep  8  2009 y8cnvt.ax

Geniatech

The install .inf file from the Geniatech driver is called CxCVBS.inf and contains the following device definitions:

[Conexant.NTx86]
%CXPOLARIS.DeviceDesc-CVBS%=POLARIS.CVBS,  	   USB\VID_1F4D&PID_0102&MI_01
%CXPOLARIS.DeviceDesc-CVBS%=POLARIS.CVBS,  	   USB\VID_0572&PID_58A3&MI_01
%CXPOLARIS.DeviceDesc-VGrabber%=POLARIS.VGrabber,  USB\VID_0572&PID_58A6&MI_01
%CXPOLARIS.DeviceDesc-EZCap%=POLARIS.EZCap,        USB\VID_0572&PID_58A7&MI_01

The driver directory contains the following files:

   18432 Oct 23 16:12 CPNotify.ax
   31704 Oct 23 16:11 CxCVBS.inf
  195712 Oct 23 16:13 CxCVBS.sys
    3449 Oct 23 17:36 CxUnCir.inf
   47104 Oct 23 16:12 EncPrxyPage.ax
 2944000 Sep  7 15:31 Setup.exe
   33792 Oct 23 16:12 Y8Cnvt.ax
  376836 Jul 18  2012 cx416enc.rom
   15360 Oct 23 16:12 cxEZCAP.ax
   47104 Oct 23 16:12 cxTVRate.dll
   11407 Oct 23 16:13 cxcvbs.cat
   30720 Oct 23 16:12 cxpolaris.ax
    8578 Oct 23 17:36 cxuncir.cat
   16382 Jul 18  2012 merlinD.rom

It is also worth noting that the Geniatech ezgrabber2driver.zip file contains both Windows and Linux directories. It was due to this that I originally purchased this device hoping they had included some support for Linux, and they do provide Linux drivers for some of their other products. However, it appears to be a mistake. The only modification of drivers in the tree I can find are some alternate definitions for au0828 cards, specifically defining 05e1:0400 and 1f4d:6011 as AU0828_BOARD_HAUPPAUGE_WOODBURY.

Other notes

Diamond VC500 EZgrabber

In some places it is noted that (some versions of?) the Diamond VC500 EZgrabber are also identified as OTG102, a cursory web search suggests this has a TM5600/6000 chipset and the Windows drivers provided by Diamond appear totally different.

lsusb ouput

lsusb -v -d 1f4d:

Bus 001 Device 006: ID 1f4d:0102 G-Tek Electronics Group
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass          239 Miscellaneous Device
  bDeviceSubClass         2 ?
  bDeviceProtocol         1 Interface Association
  bMaxPacketSize0        64
  idVendor           0x1f4d G-Tek Electronics Group
  idProduct          0x0102
  bcdDevice           40.01
  iManufacturer           1 Geniatech
  iProduct                2 OTG102
  iSerial                 3 20090427
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength          248
    bNumInterfaces          6
    bConfigurationValue     1
    iConfiguration          4 OTG102
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              500mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface             32 OTG102
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x8e  EP 14 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0020  1x 32 bytes
        bInterval               4
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x0e  EP 14 OUT
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0020  1x 32 bytes
        bInterval               4
    Interface Association:
      bLength                 8
      bDescriptorType        11
      bFirstInterface         1
      bInterfaceCount         5
      bFunctionClass        255 Vendor Specific Class
      bFunctionSubClass     255 Vendor Specific Subclass
      bFunctionProtocol     255 Vendor Specific Protocol
      iFunction               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              7 OTG102
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x8f  EP 15 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval               7
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface             20 OTG102
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface             21 OTG102
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x001c  1x 28 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       2
      bNumEndpoints           1
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface             22 OTG102
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x0034  1x 52 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface             23 OTG102
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x84  EP 4 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface             24 OTG102
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x84  EP 4 IN
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x00b8  1x 184 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       2
      bNumEndpoints           1
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface             25 OTG102
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x84  EP 4 IN
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x02d8  1x 728 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       3
      bNumEndpoints           1
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface             26 OTG102
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x84  EP 4 IN
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x13c4  3x 964 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       4
      bNumEndpoints           1
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface             27 OTG102
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x84  EP 4 IN
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x0b84  2x 900 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        4
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface             28 OTG102
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x85  EP 5 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        4
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface             31 OTG102
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x05  EP 5 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        5
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface             29 OTG102
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x86  EP 6 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        5
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface             30 OTG102
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x86  EP 6 IN
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x0240  1x 576 bytes
        bInterval               1
Device Qualifier (for other device speed):
  bLength                10
  bDescriptorType         6
  bcdUSB               2.00
  bDeviceClass          239 Miscellaneous Device
  bDeviceSubClass         2 ?
  bDeviceProtocol         1 Interface Association
  bMaxPacketSize0        64
  bNumConfigurations      1
Device Status:     0x0000
  (Bus Powered)

dmesg output


(load modules)
[12648.151975] i2c-core: driver [cx25840] registered
[12653.604826] usbcore: registered new interface driver cx231xx
...
(plug in device)
...
[44269.470642] usb 1-10: new high-speed USB device number 6 using ehci_hcd
[44269.588530] cx231xx #0: New device Geniatech OTG102 @ 480 Mbps (1f4d:0102) with 5 interfaces
[44269.588534] cx231xx #0: registering interface 1
[44269.588700] cx231xx #0: Identified as Geniatech OTG102 (card=16)
[44269.588906] i2c-dev: adapter [cx231xx #0] registered as minor 9
[44269.588922] i2c i2c-9: adapter [cx231xx #0] registered
[44269.588987] i2c-dev: adapter [cx231xx #0] registered as minor 10
[44269.589000] i2c i2c-10: adapter [cx231xx #0] registered
[44269.589059] i2c-dev: adapter [cx231xx #0] registered as minor 11
[44269.589071] i2c i2c-11: adapter [cx231xx #0] registered
[44269.652071] cx231xx #0: cx231xx_dif_set_standard: setStandard to ffffffff
[44269.661396] i2c 9-0044: uevent
[44269.661413] cx25840 9-0044: probe
[44269.662686] cx25840 9-0044: cx23102 A/V decoder found @ 0x88 (cx231xx #0)
[44269.670801] i2c i2c-9: client [cx25840] registered with bus id 9-0044
[44269.680705] cx25840 9-0044:  Firmware download size changed to 16 bytes max length
[44271.728514] cx25840 9-0044: loaded v4l-cx231xx-avcore-01.fw firmware (16382 bytes)
[44271.762699] cx231xx #0: cx231xx #0: v4l2 driver version 0.0.2
[44271.780277] cx231xx #0: cx231xx_dif_set_standard: setStandard to ffffffff
[44271.825192] cx231xx #0: video_mux : 0
[44271.825194] cx231xx #0: do_mode_ctrl_overrides : 0xb000
[44271.825936] cx231xx #0: do_mode_ctrl_overrides NTSC
[44271.832517] cx231xx #0: cx231xx #0/0: registered device video0 [v4l2]
[44271.832587] cx231xx #0: cx231xx #0/0: registered device vbi0
[44271.832589] cx231xx #0: V4L2 device registered as video0 and vbi0
[44271.832593] cx231xx #0: EndPoint Addr 0x84, Alternate settings: 5
[44271.832595] cx231xx #0: Alternate setting 0, max size= 512
[44271.832597] cx231xx #0: Alternate setting 1, max size= 184
[44271.832599] cx231xx #0: Alternate setting 2, max size= 728
[44271.832601] cx231xx #0: Alternate setting 3, max size= 2892
[44271.832603] cx231xx #0: Alternate setting 4, max size= 1800
[44271.832605] cx231xx #0: EndPoint Addr 0x85, Alternate settings: 2
[44271.832608] cx231xx #0: Alternate setting 0, max size= 512
[44271.832610] cx231xx #0: Alternate setting 1, max size= 512
[44271.832612] cx231xx #0: EndPoint Addr 0x86, Alternate settings: 2
[44271.832614] cx231xx #0: Alternate setting 0, max size= 512
[44271.832616] cx231xx #0: Alternate setting 1, max size= 576
[44272.257701] cx231xx #0: cx231xx-audio.c: probing for cx231xx non standard usbaudio
[44272.258497] cx231xx #0: EndPoint Addr 0x83, Alternate settings: 3
[44272.258502] cx231xx #0: Alternate setting 0, max size= 512
[44272.258505] cx231xx #0: Alternate setting 1, max size= 28
[44272.258507] cx231xx #0: Alternate setting 2, max size= 52
[44272.258509] cx231xx: Cx231xx Audio Extension initialized
[44272.263730] cx25840 9-0044: uevent
[44272.263891] cx25840 9-0044: uevent
[44272.264295] cx25840 9-0044: uevent
[44272.272518] cx231xx #0: cx231xx_stop_stream():: ep_mask = 8
[44272.273408] cx231xx #0:  setPowerMode::mode = 48, No Change req.
[44272.274797] cx231xx #0: cx231xx_stop_stream():: ep_mask = 8

....