Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751170AbWBCFt7 (ORCPT ); Fri, 3 Feb 2006 00:49:59 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751174AbWBCFt7 (ORCPT ); Fri, 3 Feb 2006 00:49:59 -0500 Received: from uproxy.gmail.com ([66.249.92.193]:3698 "EHLO uproxy.gmail.com") by vger.kernel.org with ESMTP id S1751170AbWBCFt6 convert rfc822-to-8bit (ORCPT ); Fri, 3 Feb 2006 00:49:58 -0500 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=t9AxWm0O0hG+nDWKNGWrsKtxJL77m8QeGs9te5BCHRrQw8ay8DRsRznAGogwAZtAaxTIJ1I0JKX6hpRbv9eazz2o+zNzdkI8fe3KbLdqIVpFZnO3TOJBnZKJZVXYa1ho6pzqeM/I2o15DvB3uwjAvVuxjZDXdDFPs7aZ+CQMulw= Message-ID: Date: Fri, 3 Feb 2006 06:49:56 +0100 From: Markus Rechberger To: Linux and Kernel Video , linux-kernel@vger.kernel.org Subject: Re: usb bandwidth allocation issue using 2 pvr devices (em28xx driver) v4l2 In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Content-Disposition: inline References: Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 34628 Lines: 916 Hi! this should be addressed to USB subsystem developers, I also reproduced this issue. The problem is the isochronous transfer in em28xx-core.c I'm quite sure it's correct and the bug is somewhere deeper in the USB subsystem. http://tinyurl.com/b443h Markus On 2/3/06, Uno Lover wrote: > Hello, > > I'm having a problem using two Kworld 2800 usb PVRs that work under the > Video for Linux Two device driver system. The KWorld 2800 USB PVR uses the > em28xx drives. > You can get this device working using the following options > modprobe em28xx card=1 tuner=2 > > When I input the two devices udev creates /dev/video0 and /dev/video1. I > can use each device using mplayer individually, however using USBview I > notice that the bandwidth allocated to the FIRST USED device is %60 percent. > So whenever I try using both devices at the same time, the first device I > call with mplayer, linux will allocate %60 percent of the USB 2.0 bandwidth > to /dev/video0 (in this example). However when I try capturing from the > second device I get "Not enough space left on device" because the second > device probably wants to allocate 60% bandwidth as well. Below are the > technical details > > I'm using the lastest v4l2 usb drivers > Kernel: Linux darkstar 2.6.15.2 > > bash-3.00# lsusb > Bus 004 Device 001: ID 0000:0000 > Bus 003 Device 001: ID 0000:0000 > Bus 002 Device 001: ID 0000:0000 > Bus 001 Device 004: ID eb1a:2820 > Bus 001 Device 002: ID eb1a:2820 > Bus 001 Device 001: ID 0000:0000 > eb1a:2820 are the two PVR's > > modules: > bash-3.00# lsmod > Module Size Used by > uhci_hcd 28428 0 > ehci_hcd 40200 0 > tda9887 15376 0 > tuner 50220 0 > firmware_class 7680 1 tuner > saa711x 6160 0 > em28xx 44456 0 > compat_ioctl32 1152 1 em28xx > v4l1_compat 12292 1 em28xx > v4l2_common 6528 2 tuner,em28xx > ir_common 23428 1 em28xx > videodev 7168 1 em28xx > tveeprom 12816 1 em28xx > i2c_core 17936 5 tda9887,tuner,saa711x,em28xx,tveeprom > eepro100 25104 0 > > v4l2 devices > bash-3.00# ls -la /dev/v4l/ > total 0 > drwxr-xr-x 2 root root 0 2006-02-02 22:49 . > drwxr-xr-x 16 root root 0 2006-02-03 00:01 .. > crw-rw---- 1 root video 81, 224 2006-02-02 22:49 vbi0 > crw-rw---- 1 root video 81, 225 2006-02-03 00:01 vbi1 > crw-rw---- 1 root video 81, 0 2006-02-02 22:49 video0 > crw-rw---- 1 root video 81, 1 2006-02-03 00:01 video1 > > mplayer example: > bash-3.00# mplayer -tv device=/dev/video0:driver=v4l2 tv:// > MPlayer dev-CVS-060104-19:55-3.3.4 (C) 2000-2005 MPlayer Team > CPU: Intel Pentium M Banias (Family: 6, Stepping: 5) > CPUflags: MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1 > Compiled for x86 CPU with extensions: MMX MMX2 SSE SSE2 > > > 89 audio & 203 video codecs > Playing tv://. > Selected driver: v4l2 > name: Video 4 Linux 2 input > author: Martin Olschewski > comment: first try, more to come ;-) > Selected device: Unknown EM2820/2840 video grabb > Tuner cap: > Tuner rxs: > Capabilites: video capture tuner audio read/write streaming > supported norms: 0 = PAL; 1 = NTSC; 2 = SECAM; 3 = PAL-M; > inputs: 0 = Composite1; 1 = S-Video; > Current input: 0 > Current format: YUYV > v4l2: current audio mode is : MONO > v4l2: ioctl query control failed: Invalid argument > ========================================================================== > Opening video decoder: [raw] RAW Uncompressed Video > VDec: vo config request - 640 x 480 (preferred colorspace: Packed YUY2) > VDec: using Packed YUY2 as output csp (no 0) > Movie-Aspect is undefined - no prescaling applied. > VO: [xv] 640x480 => 640x480 Packed YUY2 > Selected video codec: [rawyuy2] vfm: raw (RAW YUY2) > > ----------------------------------CUT-------------- > Everything works great using mplayer on the first /dev/video0 device > > Now mplayer on the second device (/dev/video1) > > bash-3.00# mplayer -tv device=/dev/video1:driver=v4l2 tv:// > MPlayer dev-CVS-060104-19:55-3.3.4 (C) 2000-2005 MPlayer Team > CPU: Intel Pentium M Banias (Family: 6, Stepping: 5) > CPUflags: MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1 > Compiled for x86 CPU with extensions: MMX MMX2 SSE SSE2 > > > 89 audio & 203 video codecs > Failed to open /dev/rtc: Device or resource busy (it should be readable by > the user.) > Playing tv://. > Selected driver: v4l2 > name: Video 4 Linux 2 input > author: Martin Olschewski > comment: first try, more to come ;-) > v4l2: unable to open '/dev/video1': No space left on device > v4l2: 0 frames successfully processed, 0 frames dropped. > > > Exiting... (End of file) > bash-3.00# > > Also note, I can produce the same thing using cat so it's not the > application > > bash-3.00# cat /dev/video1 > cat: /dev/video1: No space left on device > bash-3.00# > > If I could attach a picture of USBview you would see that the first device > called (/dev/video0) has been allocated 60% of the TOTAL USB 2.0 bandwidth. > I've run both these devices at the same time on a windows box using > USB 1.0so I know it works. It works using USB > 1.0 as a matter of fact, the problem there is the v4l2 driver doesn't work > well with USB 1.0 so I need 2.0. > > Does anyone know how I might be able to control the amount of bandwidth that > is allocated to a USB 2.0 device? If I could get the usage down to >= 50% > i'm sure that both devices could work together at the same time. > > Here is some more output. First the URB error 28 dmegs and then lsusb > output. > > ehci_hcd 0000:00:1d.7: iso sched full cdb7c800 (now 6069 max 14261) > em28xx #1: submit of urb 0 failed (error=-28) > ehci_hcd 0000:00:1d.7: iso sched full cdb7cc00 (now 8112 max 16304) > em28xx #1: submit of urb 0 failed (error=-28) > > lsusb -v > > Bus 001 Device 004: ID eb1a:2820 > Device Descriptor: > bLength 18 > bDescriptorType 1 > bcdUSB 2.00 > bDeviceClass 0 (Defined at Interface level) > bDeviceSubClass 0 > bDeviceProtocol 0 > bMaxPacketSize0 64 > idVendor 0xeb1a > idProduct 0x2820 > bcdDevice 1.00 > iManufacturer 0 > iProduct 0 > iSerial 0 > bNumConfigurations 1 > Configuration Descriptor: > bLength 9 > bDescriptorType 2 > wTotalLength 249 > bNumInterfaces 1 > bConfigurationValue 1 > iConfiguration 0 > bmAttributes 0x80 > MaxPower 500mA > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 0 > bNumEndpoints 3 > bInterfaceClass 255 Vendor Specific Class > bInterfaceSubClass 0 > bInterfaceProtocol 255 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x81 EP 1 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0001 bytes 1 once > bInterval 11 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 1 > Transfer Type Isochronous > Synch Type None > Usage Type Data > wMaxPacketSize 0x0000 bytes 0 once > bInterval 1 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x84 EP 4 IN > bmAttributes 2 > Transfer Type Bulk > Synch Type None > Usage Type Data > wMaxPacketSize 0x0200 bytes 512 once > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 1 > bNumEndpoints 3 > bInterfaceClass 255 Vendor Specific Class > bInterfaceSubClass 0 > bInterfaceProtocol 255 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x81 EP 1 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0001 bytes 1 once > bInterval 11 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 1 > Transfer Type Isochronous > Synch Type None > Usage Type Data > wMaxPacketSize 0x0400 bytes 0 once > bInterval 1 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x84 EP 4 IN > bmAttributes 2 > Transfer Type Bulk > Synch Type None > Usage Type Data > wMaxPacketSize 0x0200 bytes 512 once > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 2 > bNumEndpoints 3 > bInterfaceClass 255 Vendor Specific Class > bInterfaceSubClass 0 > bInterfaceProtocol 255 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x81 EP 1 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0001 bytes 1 once > bInterval 11 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 1 > Transfer Type Isochronous > Synch Type None > Usage Type Data > wMaxPacketSize 0x0ad4 bytes 724 three times > bInterval 1 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x84 EP 4 IN > bmAttributes 2 > Transfer Type Bulk > Synch Type None > Usage Type Data > wMaxPacketSize 0x0200 bytes 512 once > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 3 > bNumEndpoints 3 > bInterfaceClass 255 Vendor Specific Class > bInterfaceSubClass 0 > bInterfaceProtocol 255 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x81 EP 1 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0001 bytes 1 once > bInterval 11 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 1 > Transfer Type Isochronous > Synch Type None > Usage Type Data > wMaxPacketSize 0x0c00 bytes 0 once > bInterval 1 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x84 EP 4 IN > bmAttributes 2 > Transfer Type Bulk > Synch Type None > Usage Type Data > wMaxPacketSize 0x0200 bytes 512 once > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 4 > bNumEndpoints 3 > bInterfaceClass 255 Vendor Specific Class > bInterfaceSubClass 0 > bInterfaceProtocol 255 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x81 EP 1 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0001 bytes 1 once > bInterval 11 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 1 > Transfer Type Isochronous > Synch Type None > Usage Type Data > wMaxPacketSize 0x1300 bytes 768 once > bInterval 1 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x84 EP 4 IN > bmAttributes 2 > Transfer Type Bulk > Synch Type None > Usage Type Data > wMaxPacketSize 0x0200 bytes 512 once > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 5 > bNumEndpoints 3 > bInterfaceClass 255 Vendor Specific Class > bInterfaceSubClass 0 > bInterfaceProtocol 255 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x81 EP 1 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0001 bytes 1 once > bInterval 11 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 1 > Transfer Type Isochronous > Synch Type None > Usage Type Data > wMaxPacketSize 0x135c bytes 860 three times > bInterval 1 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x84 EP 4 IN > bmAttributes 2 > Transfer Type Bulk > Synch Type None > Usage Type Data > wMaxPacketSize 0x0200 bytes 512 once > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 6 > bNumEndpoints 3 > bInterfaceClass 255 Vendor Specific Class > bInterfaceSubClass 0 > bInterfaceProtocol 255 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x81 EP 1 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0001 bytes 1 once > bInterval 11 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 1 > Transfer Type Isochronous > Synch Type None > Usage Type Data > wMaxPacketSize 0x13c4 bytes 964 three times > bInterval 1 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x84 EP 4 IN > bmAttributes 2 > Transfer Type Bulk > Synch Type None > Usage Type Data > wMaxPacketSize 0x0200 bytes 512 once > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 7 > bNumEndpoints 3 > bInterfaceClass 255 Vendor Specific Class > bInterfaceSubClass 0 > bInterfaceProtocol 255 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x81 EP 1 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0001 bytes 1 once > bInterval 11 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 1 > Transfer Type Isochronous > Synch Type None > Usage Type Data > wMaxPacketSize 0x1400 bytes 0 once > bInterval 1 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x84 EP 4 IN > bmAttributes 2 > Transfer Type Bulk > Synch Type None > Usage Type Data > wMaxPacketSize 0x0200 bytes 512 once > bInterval 1 > > Bus 001 Device 002: ID eb1a:2820 > Device Descriptor: > bLength 18 > bDescriptorType 1 > bcdUSB 2.00 > bDeviceClass 0 (Defined at Interface level) > bDeviceSubClass 0 > bDeviceProtocol 0 > bMaxPacketSize0 64 > idVendor 0xeb1a > idProduct 0x2820 > bcdDevice 1.00 > iManufacturer 0 > iProduct 0 > iSerial 0 > bNumConfigurations 1 > Configuration Descriptor: > bLength 9 > bDescriptorType 2 > wTotalLength 249 > bNumInterfaces 1 > bConfigurationValue 1 > iConfiguration 0 > bmAttributes 0x80 > MaxPower 500mA > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 0 > bNumEndpoints 3 > bInterfaceClass 255 Vendor Specific Class > bInterfaceSubClass 0 > bInterfaceProtocol 255 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x81 EP 1 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0001 bytes 1 once > bInterval 11 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 1 > Transfer Type Isochronous > Synch Type None > Usage Type Data > wMaxPacketSize 0x0000 bytes 0 once > bInterval 1 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x84 EP 4 IN > bmAttributes 2 > Transfer Type Bulk > Synch Type None > Usage Type Data > wMaxPacketSize 0x0200 bytes 512 once > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 1 > bNumEndpoints 3 > bInterfaceClass 255 Vendor Specific Class > bInterfaceSubClass 0 > bInterfaceProtocol 255 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x81 EP 1 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0001 bytes 1 once > bInterval 11 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 1 > Transfer Type Isochronous > Synch Type None > Usage Type Data > wMaxPacketSize 0x0400 bytes 0 once > bInterval 1 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x84 EP 4 IN > bmAttributes 2 > Transfer Type Bulk > Synch Type None > Usage Type Data > wMaxPacketSize 0x0200 bytes 512 once > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 2 > bNumEndpoints 3 > bInterfaceClass 255 Vendor Specific Class > bInterfaceSubClass 0 > bInterfaceProtocol 255 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x81 EP 1 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0001 bytes 1 once > bInterval 11 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 1 > Transfer Type Isochronous > Synch Type None > Usage Type Data > wMaxPacketSize 0x0ad4 bytes 724 three times > bInterval 1 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x84 EP 4 IN > bmAttributes 2 > Transfer Type Bulk > Synch Type None > Usage Type Data > wMaxPacketSize 0x0200 bytes 512 once > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 3 > bNumEndpoints 3 > bInterfaceClass 255 Vendor Specific Class > bInterfaceSubClass 0 > bInterfaceProtocol 255 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x81 EP 1 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0001 bytes 1 once > bInterval 11 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 1 > Transfer Type Isochronous > Synch Type None > Usage Type Data > wMaxPacketSize 0x0c00 bytes 0 once > bInterval 1 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x84 EP 4 IN > bmAttributes 2 > Transfer Type Bulk > Synch Type None > Usage Type Data > wMaxPacketSize 0x0200 bytes 512 once > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 4 > bNumEndpoints 3 > bInterfaceClass 255 Vendor Specific Class > bInterfaceSubClass 0 > bInterfaceProtocol 255 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x81 EP 1 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0001 bytes 1 once > bInterval 11 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 1 > Transfer Type Isochronous > Synch Type None > Usage Type Data > wMaxPacketSize 0x1300 bytes 768 once > bInterval 1 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x84 EP 4 IN > bmAttributes 2 > Transfer Type Bulk > Synch Type None > Usage Type Data > wMaxPacketSize 0x0200 bytes 512 once > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 5 > bNumEndpoints 3 > bInterfaceClass 255 Vendor Specific Class > bInterfaceSubClass 0 > bInterfaceProtocol 255 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x81 EP 1 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0001 bytes 1 once > bInterval 11 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 1 > Transfer Type Isochronous > Synch Type None > Usage Type Data > wMaxPacketSize 0x135c bytes 860 three times > bInterval 1 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x84 EP 4 IN > bmAttributes 2 > Transfer Type Bulk > Synch Type None > Usage Type Data > wMaxPacketSize 0x0200 bytes 512 once > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 6 > bNumEndpoints 3 > bInterfaceClass 255 Vendor Specific Class > bInterfaceSubClass 0 > bInterfaceProtocol 255 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x81 EP 1 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0001 bytes 1 once > bInterval 11 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 1 > Transfer Type Isochronous > Synch Type None > Usage Type Data > wMaxPacketSize 0x13c4 bytes 964 three times > bInterval 1 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x84 EP 4 IN > bmAttributes 2 > Transfer Type Bulk > Synch Type None > Usage Type Data > wMaxPacketSize 0x0200 bytes 512 once > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 7 > bNumEndpoints 3 > bInterfaceClass 255 Vendor Specific Class > bInterfaceSubClass 0 > bInterfaceProtocol 255 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x81 EP 1 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0001 bytes 1 once > bInterval 11 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x82 EP 2 IN > bmAttributes 1 > Transfer Type Isochronous > Synch Type None > Usage Type Data > wMaxPacketSize 0x1400 bytes 0 once > bInterval 1 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x84 EP 4 IN > bmAttributes 2 > Transfer Type Bulk > Synch Type None > Usage Type Data > wMaxPacketSize 0x0200 bytes 512 once > bInterval 1 > > Bus 001 Device 001: ID 0000:0000 > Device Descriptor: > bLength 18 > bDescriptorType 1 > bcdUSB 2.00 > bDeviceClass 9 Hub > bDeviceSubClass 0 Unused > bDeviceProtocol 1 Single TT > bMaxPacketSize0 64 > idVendor 0x0000 > idProduct 0x0000 > bcdDevice 2.06 > iManufacturer 3 Linux 2.6.15.2 ehci_hcd > iProduct 2 EHCI Host Controller > iSerial 1 0000:00:1d.7 > bNumConfigurations 1 > Configuration Descriptor: > bLength 9 > bDescriptorType 2 > wTotalLength 25 > bNumInterfaces 1 > bConfigurationValue 1 > iConfiguration 0 > bmAttributes 0xc0 > Self Powered > MaxPower 0mA > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 0 > bNumEndpoints 1 > bInterfaceClass 9 Hub > bInterfaceSubClass 0 Unused > bInterfaceProtocol 0 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x81 EP 1 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0002 bytes 2 twice > bInterval 12 > bash-3.00# > > > Thanks for your help > -jamaal > -- > video4linux-list mailing list > Unsubscribe mailto:video4linux-list-request@redhat.com?subjectunsubscribe > https://www.redhat.com/mailman/listinfo/video4linux-list > -- Markus Rechberger - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/