From patchwork Thu Feb 27 00:22:08 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Antti Palosaari X-Patchwork-Id: 3729411 Return-Path: X-Original-To: patchwork-linux-media@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id E4712BF13A for ; Thu, 27 Feb 2014 00:22:31 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id EE650201D3 for ; Thu, 27 Feb 2014 00:22:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DF7EE2020A for ; Thu, 27 Feb 2014 00:22:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754079AbaB0AWZ (ORCPT ); Wed, 26 Feb 2014 19:22:25 -0500 Received: from mail.kapsi.fi ([217.30.184.167]:41332 "EHLO mail.kapsi.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754022AbaB0AWW (ORCPT ); Wed, 26 Feb 2014 19:22:22 -0500 Received: from dyn3-82-128-184-75.psoas.suomi.net ([82.128.184.75] helo=localhost.localdomain) by mail.kapsi.fi with esmtpsa (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.72) (envelope-from ) id 1WIok1-0003ng-AD; Thu, 27 Feb 2014 02:22:21 +0200 From: Antti Palosaari To: linux-media@vger.kernel.org Cc: Hans Verkuil , Antti Palosaari Subject: [REVIEW PATCH 13/13] DocBook: media: add some general info about RF tuners Date: Thu, 27 Feb 2014 02:22:08 +0200 Message-Id: <1393460528-11684-14-git-send-email-crope@iki.fi> X-Mailer: git-send-email 1.8.5.3 In-Reply-To: <1393460528-11684-1-git-send-email-crope@iki.fi> References: <1393460528-11684-1-git-send-email-crope@iki.fi> X-SA-Exim-Connect-IP: 82.128.184.75 X-SA-Exim-Mail-From: crope@iki.fi X-SA-Exim-Scanned: No (on mail.kapsi.fi); SAEximRunCond expanded to false Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add some info what is RF tuner in context of V4L RF tuner class. Cc: Hans Verkuil Signed-off-by: Antti Palosaari --- Documentation/DocBook/media/v4l/controls.xml | 23 +++++++++++++++++++++-- 1 file changed, 21 insertions(+), 2 deletions(-) diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml index 92e3335..9adf630 100644 --- a/Documentation/DocBook/media/v4l/controls.xml +++ b/Documentation/DocBook/media/v4l/controls.xml @@ -4975,8 +4975,27 @@ defines possible values for de-emphasis. Here they are:
RF Tuner Control Reference - The RF Tuner (RF_TUNER) class includes controls for common features -of devices having RF tuner. + +The RF Tuner (RF_TUNER) class includes controls for common features of devices +having RF tuner. + + +In this context, RF tuner is radio receiver circuit between antenna and +demodulator. It receives radio frequency (RF) from the antenna and converts that +received signal to lower intermediate frequency (IF) or baseband frequency (BB). +Tuners that could do baseband output are often called Zero-IF tuners. Older +tuners were typically simple PLL tuners inside a metal box, whilst newer ones +are highly integrated chips without a metal box "silicon tuners". These controls +are mostly applicable for new feature rich silicon tuners, just because older +tuners does not have much adjustable features. + + +For more information about RF tuners see +Tuner (radio) +and +RF front end +from Wikipedia. + RF_TUNER Control IDs