Hello.
I know almost nothing about internals of usb and
linux kernel.. That should be a good start, rigth? :)
I've got a new USB CDMA modem from a local 3g retailer,
but apparently it does not work under linux. Google
shows only other people like me - all in my region -
who got it but wasn't able to use it.
The device reports itself as
usb 3-1: Product: CELOT CDMA Products
usb 3-1: Manufacturer: CELOT Corporation
it's id 211f:6801, and the label tells us
it's "CT-650" model or, on the back side,
"CT-650 USB modem CDMA 450 1xEVDO".
Here's lsusb -v output:
Bus 003 Device 006: ID 211f:6801
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x211f
idProduct 0x6801
bcdDevice 0.00
iManufacturer 1 CELOT Corporation
iProduct 2 CELOT CDMA Products
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 85
bNumInterfaces 3
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 3
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 255 Vendor Specific Protocol
iInterface 3 Data Interface
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 128
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 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 255 Vendor Specific Protocol
iInterface 3 Data Interface
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x84 EP 4 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 0x04 EP 4 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
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 3 Data Interface
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x85 EP 5 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 0x05 EP 5 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Device Status: 0x0000
(Bus Powered)
Apparently, as shown in http://wl500g.info/showthread.php?t=24275
thread (in russian), the company provided a linux driver for the
device, -- http://wl500g.info/attachment.php?s=6b244d013439da0ee333d981d9122c59&attachmentid=6677&d=1277919509
Which turns out to be a renamed and "cleaned up" version of
drivers/usb/serial/option.c file.
So I added the device ID into existing option.c (2.6.34),
like this:
...
{ USB_DEVICE(OLIVETTI_VENDOR_ID, OLIVETTI_PRODUCT_OLICARD100) },
#define CELOT_VENDOR_ID 0x211f
#define CELOT_PRODUCT_CT680M 0x6801
{ USB_DEVICE(CELOT_VENDOR_ID, CELOT_PRODUCT_CT680M) },
{ } /* Terminating entry */
};
Now it is recognized by the driver, and even works, but it
creates 3 ttyUSB devices (0, 1 and 2), from which only
ttyUSB0 works, the rest 2 does not respond to AT commands.
[187658.087913] USB Serial support registered for GSM modem (1-port)
[187658.087913] option 3-1:1.0: GSM modem (1-port) converter detected
[187658.087913] usb 3-1: GSM modem (1-port) converter now attached to ttyUSB0
[187658.087913] option 3-1:1.1: GSM modem (1-port) converter detected
[187658.087913] usb 3-1: GSM modem (1-port) converter now attached to ttyUSB1
[187658.087913] option 3-1:1.2: GSM modem (1-port) converter detected
[187658.091245] usb 3-1: GSM modem (1-port) converter now attached to ttyUSB2
I'm not sure what to do next. The device works for me, but I'd
rather finish its support and submit it to the kernel properly.
What's missing now are the 2 extra, non-functional ports.
Thank you!
/mjt
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