Generic driver for datacards with atmodem.

Hi all, Recently, I bought a Teracom datacard (Linktop / LW273) distributed by BSNL in India. The device was not working out of the box with ModemManager or ofono as the usb_modeswitch was unable to switch the device from data interface to modem. After few trials, I managed to switch the device to modem mode using usb_modeswitch and then ModemManager was able to detect my device and I was able to use NetworkManager to make connection. But with ofono, it's not working even though it's stated on the ofono wiki that generic AT modems should work out of the box. Then I tried with different existing ofono drivers by adding udev rule in /lib/udev/rules/97-ofono.rules and found that the `nokia` driver (which is used for Nokia CS-10 and CS-17) is working with this device. However, ofono debug (with OFONO_AT_DEBUG=1) says sms feature is not available for the device. So I think, this driver needs to be more generic, In my opinion, ofono should have a generic driver for such AT modems say `atgen` or similar. I am attaching lsusb output as well as output of udev monitor. Hope this will help. Regards -- Amit Mendapara