From patchwork Mon Feb 15 19:10:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 12089121 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2E39EC433DB for ; Mon, 15 Feb 2021 19:12:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E996B64E13 for ; Mon, 15 Feb 2021 19:12:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229925AbhBOTLq (ORCPT ); Mon, 15 Feb 2021 14:11:46 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:22833 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229908AbhBOTLp (ORCPT ); Mon, 15 Feb 2021 14:11:45 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1613416215; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=rhWeoWA0yDSgOZOfB26TbTET/0qvQB8GfCjmVCIUYxY=; b=BAjIC7mxvfJU4zIQ5y8M9zwk6bMF5l8yN/k6MyoiPiiIomyyKZOEvCg9xrKfDglVIHiSkM s8En+BMLARFNbO8pELipu7BIXFZyCy2du9Qry3+SOXFPyBZP67v1RzIJGvPDwePA9rklUf lpMR0G6JXSuUgQMpMLxot5KkczZ1vYE= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-599-tylSJ-EjN5uMKullNpKceg-1; Mon, 15 Feb 2021 14:10:11 -0500 X-MC-Unique: tylSJ-EjN5uMKullNpKceg-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 18D2918957E4; Mon, 15 Feb 2021 19:10:10 +0000 (UTC) Received: from x1.localdomain (ovpn-115-74.ams2.redhat.com [10.36.115.74]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5F5D360BE2; Mon, 15 Feb 2021 19:10:08 +0000 (UTC) From: Hans de Goede To: Jonathan Cameron Cc: Hans de Goede , Mark Pearson , Bastien Nocera , Dmitry Torokhov , Lars-Peter Clausen , Peter Meerwald-Stadler , linux-iio@vger.kernel.org, Mark Pearson Subject: [PATCH v2 2/2] iio: documentation: Document accelerometer label use Date: Mon, 15 Feb 2021 20:10:03 +0100 Message-Id: <20210215191003.698888-2-hdegoede@redhat.com> In-Reply-To: <20210215191003.698888-1-hdegoede@redhat.com> References: <20210215191003.698888-1-hdegoede@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Some 2-in-1 laptops / convertibles with 360° (yoga-style) hinges, have 2 accelerometers, 1 in their base and 1 in their display. In many cases the kernel can detect the location of each accelerometer based on e.g. information from the ACPI tables. It is important for userspace to know the location of the 2 accelerometers. Rather then adding a new sysfs-attribute for this we can relay this information to userspace by using standardized label strings for this. This mirrors how this is done for proximity sensors. This commit documents 2 new standardized label strings for this purpose: "accel-base" "accel-display" Note the "base" and "display" suffixes were chosen to match the values used for the systemd/udev hwdb.d/60-sensor.hwdb file's ACCEL_LOCATION property. Cc: Dmitry Torokhov Cc: Mark Pearson Cc: Bastien Nocera Signed-off-by: Hans de Goede --- Documentation/ABI/testing/sysfs-bus-iio | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio index 364f842350ab..5764f100d33d 100644 --- a/Documentation/ABI/testing/sysfs-bus-iio +++ b/Documentation/ABI/testing/sysfs-bus-iio @@ -72,6 +72,13 @@ Description: calculated by firmware from other sensor readings, rather then being a raw sensor reading. + For accelerometers used in 2-in-1s with 360° (yoga-style) hinges, + which have an accelerometer in both their base and their display, + the following standardized labels are used: + + * "accel-base" + * "accel-display" + What: /sys/bus/iio/devices/iio:deviceX/current_timestamp_clock KernelVersion: 4.5 Contact: linux-iio@vger.kernel.org