From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754903AbYHYP4x (ORCPT ); Mon, 25 Aug 2008 11:56:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753639AbYHYP4q (ORCPT ); Mon, 25 Aug 2008 11:56:46 -0400 Received: from casper.infradead.org ([85.118.1.10]:58559 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753562AbYHYP4p (ORCPT ); Mon, 25 Aug 2008 11:56:45 -0400 Date: Mon, 25 Aug 2008 08:49:46 -0700 From: Greg KH To: ctuxer Cc: linux-kernel@vger.kernel.org, eerpini@gmail.com Subject: Re: better support for EV-DO AC8700 800 M usbserial modem ?? Message-ID: <20080825154946.GA8628@kroah.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.16 (2007-06-09) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Aug 24, 2008 at 09:41:33AM +0530, ctuxer wrote: > hi everyone , > > i have been using the EVDO AC8700 modem (usbserial) with kernel 2.6.26.2 , > it uses the 'option' module along with the generic usbserial module . Well > i am happy for the improved support for the modem handling in the new > kernels( like now i don have to modprobe with the vendor and product IDs ) > , there is one point specific to this modem which is still not handled , > ..... the modem switches between EVDO and CDMA mode when the signal > strength is low or when there is a bandwidth overload at the vendor's( the > service provider , bsnl in my case ) tower . This switch in the mode is > not recognised by the driver and the connection is lost once this switching > occurs . I have to restart the wvdial program to reconnect . > > But if the modem were in CDMA mode when i connect , then the connection is > not lost when the modem switches back from CDMA to EVDO . I really don know > enough to understand what is the difference between the two cases or what > can be done to improve the support for this usbserial modem , ... can > anyone help ? This looks like something the userspace side has to handle, the option driver is just a dumb "pass-through" type driver, it doesn't really control the modem at all. The "control" channel on the modem allows this to happen, a userspace program drives this. good luck, greg k-h