Hello,
Here is the result of the lsusb with the device.
~$ lsusb -vv -d 15ec:
Bus 001 Device 024: ID 15ec:c05f Belcarra Technologies Corp.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 239 Miscellaneous Device
bDeviceSubClass 2 ?
bDeviceProtocol 1 Interface Association
bMaxPacketSize0 64
idVendor 0x15ec Belcarra Technologies Corp.
idProduct 0xc05f
bcdDevice 1.00
iManufacturer 3
iProduct 4
iSerial 5
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 191
bNumInterfaces 5
bConfigurationValue 1
iConfiguration 17
bmAttributes 0xc0
Self Powered
MaxPower 2mA
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 0
bInterfaceCount 2
bFunctionClass 2 Communications
bFunctionSubClass 2 Abstract (modem)
bFunctionProtocol 0 None
iFunction 18
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 2 Communications
bInterfaceSubClass 2 Abstract (modem)
bInterfaceProtocol 1 AT-commands (v.25ter)
iInterface 19
CDC Header:
bcdCDC 1.10
CDC Call Management:
bmCapabilities 0x03
call management
use DataInterface
bDataInterface 1
CDC Union:
bMasterInterface 0
bSlaveInterface 1 0 0 0
CDC ACM:
bmCapabilities 0x06
sends break
line coding and serial state
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 4
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
iInterface 20
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 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 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 2
bInterfaceCount 2
bFunctionClass 2 Communications
bFunctionSubClass 6 Ethernet Networking
bFunctionProtocol 0
iFunction 21
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 2 Communications
bInterfaceSubClass 6 Ethernet Networking
bInterfaceProtocol 0
iInterface 22
CDC Header:
bcdCDC 1.10
CDC Ethernet:
iMacAddress 6 (??)
bmEthernetStatistics 0x00000000
wMaxSegmentSize 1514
wNumberMCFilters 0x0000
bNumberPowerFilters 0
CDC Union:
bMasterInterface 2
bSlaveInterface 3 0 0 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 3
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
iInterface 23
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 3
bAlternateSetting 1
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
iInterface 24
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 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 4
bInterfaceCount 1
bFunctionClass 8 Mass Storage
bFunctionSubClass 6 SCSI
bFunctionProtocol 80 Bulk (Zip)
iFunction 25
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 4
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 80 Bulk (Zip)
iInterface 26
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x03 EP 3 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 0x85 EP 5 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
It seems to me that the 3 latest slave interfaces sent for the CDC ECM are not used, then they may be ignored.
Did I make any mistake, please ?
Regards
Fred
Frederic Danis wrote:
Hello,
I am working on a device which provide a CDC ECM interface.
When I connect it to an Ubuntu 8.04 desktop using 2.6.27-14 kernel, the
interface does not go up and I get the following error :
kernel: [33329.037807] usb 1-4.1: bad CDC descriptors
I found that my device send a CDC UNION descriptor with multiple slave
interfaces.
After some check I found the definition of the structure in the kernel
(include/linux/usb/cdc.h) :
/* "Union Functional Descriptor" from CDC spec 5.2.3.8 */
struct usb_cdc_union_desc {
__u8 bLength;
__u8 bDescriptorType;
__u8 bDescriptorSubType;
__u8 bMasterInterface0;
__u8 bSlaveInterface0;
/* ... and there could be other slave interfaces */
} __attribute__ ((packed));
But in function usbnet_generic_cdc_bind() (in file
drivers/net/usb/cdc_ether.c line 173), the check for the CDC UNION
descriptor is done on the exact size of the structure:
if (info->u->bLength != sizeof *info->u)
This works only if there is one single slave interface (so the bLength
is equal to the structure length).
Shouldn't it be : if (info->u->bLength < sizeof *info->u) ?
Regards
Fred
--
-----------------------------------------------
It is not by improving the oil lamp that one invents the electric bulb!
-----------------------------------------------
Danis Frederic Access Company
Software engineer
Mail : mailto:frederic.danis@xxxxxxxxxxxxxxxxxx
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