Hello Alan,
thanks for the quick response.
On 18.02.08, Alan Stern wrote:
> On Mon, 18 Feb 2008, Alan Stern wrote:
> > On Mon, 18 Feb 2008, Michael SCHINDLER wrote:
> >
> > > I have recompiled the kernel with USB debugging, and now I see
> > > explicitly that EHCI hands over the device to its companion driver
> > > OHCI (see below).
> > >
> > > However, I do not yet know why this happens and how I can avoid it and
> > > have the device handled by EHCI at full speed. Is it sufficient to
> > > create a new entry in unusual_dev.h? How do I specify the capability
> > > of USB2.0 there?
> > Judging from your log, the reason the handover occurs is because your
> > device doesn't support high-speed operation. To confirm this, let's
> > see what "lsusb -v" has to say about the device.
The output from lsusb -v for the device is below. I tested the device
with MacOSX and found a transfer rate corresponding to high-speed
(approximately the same as for a nicely working USB key, see below).
In the meantime, I have tested the device with a different linux
computer (also debian lenny) and found the same transfer rates. Only,
this time the companion driver is UHCI and not OHCI. The logs below
correspond to this situation.
> Another possible explanation is that your computer's EHCI controller
> doesn't work properly. Can you run any devices attached to that USB
> port at high speed?
Yes, I can. For comparison, I include the output from lsusb -v for a
Toshiba USB key, which works nicely.
Michael
-------------- lsusb -v for the strange MP3-player ----------------
Bus 001 Device 002: ID 04e8:9826 Samsung Electronics Co., Ltd
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 16
idVendor 0x04e8 Samsung Electronics Co., Ltd
idProduct 0x9826
bcdDevice 1.00
iManufacturer 1 NewTech Inc.
iProduct 2 USB Mass Storage Device 2.0
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 39
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 200mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 3
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 80 Bulk (Zip)
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x03 EP 3 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 255
-------------- lsusb -v for a working USB key ----------------
Bus 005 Device 004: ID 0930:6528 Toshiba Corp.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0930 Toshiba Corp.
idProduct 0x6528
bcdDevice 1.00
iManufacturer 1 TOSHIBA
iProduct 2 TransMemory
iSerial 3 0A81F750B0F04A48
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 39
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 200mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 3
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 80 Bulk (Zip)
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 4
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)
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