Hello,
I have a H24 modem which is configured in with "AT+MCONN=4" to use 2
interfaces for Data and Control. The Data interface is used by cdc_acm and
works find, but the control interface generates the following error messages
each time the driver/device binding happens.
[ 47.985329] cdc_acm 8-1:1.0: ttyACM1: USB ACM device
[ 47.992386] cdc_acm 8-1:1.2: Zero length descriptor references
[ 47.998417] cdc_acm: probe of 8-1:1.2 failed with error -22
The control interface can be used by usbserial as referenced in the "H24 AT
Commands Refernece Guide" using
> modprobe usbserial vendor=0x22b8 product=0x2d93
Is there a way either cdc_acm can use the Control interface or silently ignore
it?
Best regards,
Alexander
lsusb output:
lsusb -v -d 22b8:2d93
Bus 008 Device 011: ID 22b8:2d93 Motorola PCS
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 255 Vendor Specific Class
bDeviceSubClass 255 Vendor Specific Subclass
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x22b8 Motorola PCS
idProduct 0x2d93
bcdDevice 0.02
iManufacturer 1 Motorola, Inc.
iProduct 2 Motorola Phone (H24)
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 90
bNumInterfaces 3
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 20mA
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 0
CDC Header:
bcdCDC 1.10
CDC ACM:
bmCapabilities 0x02
line coding and serial state
CDC Call Management:
bmCapabilities 0x03
call management
use DataInterface
bDataInterface 1
CDC Union:
bMasterInterface 0
bSlaveInterface 1
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 5
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
iInterface 3 Motorola Communication Interface
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 32
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 32
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 255 Vendor Specific Protocol
iInterface 4 Motorola Communication Interface
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 32
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 32
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 255 Vendor Specific Class
bDeviceSubClass 255 Vendor Specific Subclass
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)
--
Dipl.-Inf. Alexander Stein
SYS TEC electronic GmbH
August-Bebel-Str. 29
D-07973 Greiz
Tel: +49-3661-6279-0, Fax: +49-3661-6279-99
eMail: Alexander.Stein@xxxxxxxxxxxxxxxxxxxxx
Internet: http://www.systec-electronic.com
Managing Director: Dipl.-Phys. Siegmar Schmidt
Commercial registry: Amtsgericht Jena, HRB 205563
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