Configuring a Conexant USB modem

[bobaoett at mailbox.org]

Hallo Jeffrey,

On Thu, Feb 14, 2019 at 02:06:35PM -0500, Jeffrey Walton wrote:
> Hi Everyone,
> 
> I'm having trouble using a USB modem. It is a Conexant modem but it is
> not responding to AT commands. Sample code is at
> https://pastebin.com/84YUn9ey .
> 
> I think the first thing I need to do is verify the kernel
> configuration for the device. For that:
> 
>     $ sudo setserial -a /dev/ttyACM0
>     /dev/ttyACM0, Line 0, UART: unknown, Port: 0x0000, IRQ: 0
>         Baud_base: 115200, close_delay: 12, divisor: 0
>         closing_wait: 750
>         Flags: spd_normal
> 
> At this point I think I need to read some kernel docs. I'm not sure if
> I should be in https://www.kernel.org/doc/Documentation/serial or
> https://www.kernel.org/doc/Documentation/usb . Looking through the
> pages nothing jumps out as specific to the Conexant.

Maybe these could be interesting?

https://www.kernel.org/doc/Documentation/usb/acm.txt
https://www.kernel.org/doc/Documentation/usb/gadget_serial.txt

> 
> Can someone suggest what my next steps are to verify the modem's
> configuration with respect to the kernel and driver?
> 
> Thanks in advance.

Best regards,
Thorsten

> 
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