From patchwork Mon Sep 3 13:48:39 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans Verkuil X-Patchwork-Id: 1399881 Return-Path: X-Original-To: patchwork-linux-media@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id 4EBA3DF2AB for ; Mon, 3 Sep 2012 13:50:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932147Ab2ICNt5 (ORCPT ); Mon, 3 Sep 2012 09:49:57 -0400 Received: from smtp-vbr4.xs4all.nl ([194.109.24.24]:2330 "EHLO smtp-vbr4.xs4all.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932104Ab2ICNs7 (ORCPT ); Mon, 3 Sep 2012 09:48:59 -0400 Received: from alastor.dyndns.org (166.80-203-20.nextgentel.com [80.203.20.166] (may be forged)) (authenticated bits=0) by smtp-vbr4.xs4all.nl (8.13.8/8.13.8) with ESMTP id q83DmtBu061909 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL); Mon, 3 Sep 2012 15:48:56 +0200 (CEST) (envelope-from hverkuil@xs4all.nl) Received: from durdane.fritz.box (marune.xs4all.nl [80.101.105.217]) (Authenticated sender: hans) by alastor.dyndns.org (Postfix) with ESMTPSA id 90EB135E0277; Mon, 3 Sep 2012 15:48:48 +0200 (CEST) From: Hans Verkuil To: linux-media@vger.kernel.org Cc: Hans Verkuil Subject: [RFC PATCH 05/10] DocBook: bus_info can no longer be empty. Date: Mon, 3 Sep 2012 15:48:39 +0200 Message-Id: <74c956b5efd85c1eee1dde877323a610d750aa7e.1346679785.git.hans.verkuil@cisco.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1346680124-15169-1-git-send-email-hverkuil@xs4all.nl> References: <1346680124-15169-1-git-send-email-hverkuil@xs4all.nl> In-Reply-To: References: X-Virus-Scanned: by XS4ALL Virus Scanner Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: Hans Verkuil During the 2012 Media Workshop it was decided that bus_info as returned by VIDIOC_QUERYCAP can no longer be empty. It should be a unique identifier, and empty strings are obviously not unique. Signed-off-by: Hans Verkuil --- Documentation/DocBook/media/v4l/vidioc-querycap.xml | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/Documentation/DocBook/media/v4l/vidioc-querycap.xml b/Documentation/DocBook/media/v4l/vidioc-querycap.xml index f33dd74..e3df17a 100644 --- a/Documentation/DocBook/media/v4l/vidioc-querycap.xml +++ b/Documentation/DocBook/media/v4l/vidioc-querycap.xml @@ -90,11 +90,16 @@ ambiguities. __u8 bus_info[32] Location of the device in the system, a -NUL-terminated ASCII string. For example: "PCI Slot 4". This +NUL-terminated ASCII string. For example: "PCI:0000:05:06.0". This information is intended for users, to distinguish multiple -identical devices. If no such information is available the field may -simply count the devices controlled by the driver, or contain the -empty string (bus_info[0] = 0). +identical devices. If no such information is available the field must +simply count the devices controlled by the driver ("vivi-000"). The bus_info +must start with "PCI:" for PCI boards, "PCIe:" for PCI Express boards, +"usb-" for USB devices, "I2C:" for i2c devices and "ISA:" for ISA devices. +For devices without a bus it should start with the driver name, optionally +followed by "-" and an index if multiple instances of the device as possible. +Many platform devices can have only one instance, so in that case bus_info +is identical to the driver field. __u32