On Mon, Mar 8, 2010 at 8:39 AM, Murali K. Vemuri <murali@xxxxxxxxxxx> wrote:
>
> Hi,
> I am using linux kernel 2.6.19 ported onto a proprietary hardware.
> I am connecting a USB Modem that is being recognized by the driver as :
> "storage card".
>
> I did "cat /proc/bus/usb/devices" to find the information about the
> driver and found these lines:
>
> C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=500mA
> I: If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50
> Driver=usb-storage
>
> I checked the same values for another modem which was working good for
> application: and I got this output:
>
> C:* #Ifs= 4 Cfg#= 1 Atr=80 MxPwr=500mA
> I: If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff
> Driver=usbserial_generic
>
>
> As you can see, the driver that is loaded in the working case is
> different from the non-working.
Why your "modem" showing cls = 08 ? Is it a composite device ? i guess
you need to select the proper configuration.
Is the device not working on a standard Linux PC ?
>
> Is it possible to force load the drver as usbserial-generic?
>
> I tried to dig a little further to dump the following data structure for
> both the modems and to my surprise all the fields were same except
> bcdUSB.
>
> struct usb_device_descriptor {
> __u8 bLength;
> __u8 bDescriptorType;
>
> __le16 bcdUSB;
> __u8 bDeviceClass;
> __u8 bDeviceSubClass;
> __u8 bDeviceProtocol;
> __u8 bMaxPacketSize0;
> __le16 idVendor;
> __le16 idProduct;
> __le16 bcdDevice;
> __u8 iManufacturer;
> __u8 iProduct;
> __u8 iSerialNumber;
> __u8 bNumConfigurations;
> } __attribute__ ((packed));
>
> Is there some other place where I can force the kernel to load the
> driver differently?
>
> Thanks in advance
> Murali
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