On Thu, Jan 13, 2011 at 2:17 PM, Greg KH <greg@xxxxxxxxx> wrote: > On Wed, Jan 12, 2011 at 07:51:07PM -0500, Brian Walsh wrote: >> I have an LG LTE USB modem device. ÂUnder windows the device presents itself >> as 7 serial ports and 1 ethernet interface. ÂUnder linux the device presents >> itself as 1 cdc-acm device and 1 usb ethernet device. ÂI captured some usbmon >> logs of the communication with the device under a Windows VM. ÂIt appears to >> be using a simple mux protocol. ÂI attached a segment of the usbmon log file >> that shows the communication with the AT serial port. >> >> Is there any existing driver which follows a format like this that can be >> modified to support this device? > > What's wrong with using the cdc-acm and usb ethernet connections that > are bound to the device from Linux? Âdo they not work properly? > > thanks, > > greg k-h > To communicate with the device over the cdc-acm interface you need to use the mux protocol it has implemented. You can not open the cdc-acm port in minicom and just start issuing AT commands. I was not sure if this should be addressed as a new usb driver or possibly as a tty line discipline. I was able to write a simple daemon using a socket file to communicate with the muxed AT port on the cdc-acm interface. This does not allow me to use ppp over this communication method though. I am not sure if the ethernet interface was fully working properly under linux and wanted to try a ppp connection. Brian -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
