From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail.kapsi.fi ([217.30.184.167]:57332 "EHLO mail.kapsi.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752570Ab2GJQUX (ORCPT ); Tue, 10 Jul 2012 12:20:23 -0400 Received: from dyn3-82-128-190-162.psoas.suomi.net ([82.128.190.162] helo=localhost.localdomain) by mail.kapsi.fi with esmtpsa (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.72) (envelope-from ) id 1SodAj-0006QO-JY for linux-media@vger.kernel.org; Tue, 10 Jul 2012 19:20:21 +0300 Message-ID: <4FFC563E.4070501@iki.fi> Date: Tue, 10 Jul 2012 19:20:14 +0300 From: Antti Palosaari MIME-Version: 1.0 To: linux-media Subject: comments for DVB LNA API Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: I am looking how to implement LNA support for the DVB API. What we need to be configurable at least is: OFF, ON, AUTO. There is LNAs that support variable gain and likely those will be sooner or later. Actually I think there is already LNAs integrated to the RF-tuner that offers adjustable gain. Also looking to NXP catalog and you will see there is digital TV LNAs with adjustable gain. Coming from that requirements are: adjustable gain 0-xxx dB LNA OFF LNA ON LNA AUTO Setting LNA is easy but how to query capabilities of supported LNA values? eg. this device has LNA which supports Gain=5dB, Gain=8dB, LNA auto? LNA ON (bypass) could be replaced with Gain=0 and LNA ON with Gain>0, Gain=-1 is for auto example. regards Antti -- http://palosaari.fi/