From patchwork Wed Dec 5 00:42:21 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Hutterer X-Patchwork-Id: 10712855 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8BAE017D5 for ; Wed, 5 Dec 2018 00:43:46 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7A54928790 for ; Wed, 5 Dec 2018 00:43:46 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6ED6F287AE; Wed, 5 Dec 2018 00:43:46 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F350528790 for ; Wed, 5 Dec 2018 00:43:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726554AbeLEAmy (ORCPT ); Tue, 4 Dec 2018 19:42:54 -0500 Received: from wout2-smtp.messagingengine.com ([64.147.123.25]:43921 "EHLO wout2-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725904AbeLEAmy (ORCPT ); Tue, 4 Dec 2018 19:42:54 -0500 Received: from compute3.internal (compute3.nyi.internal [10.202.2.43]) by mailout.west.internal (Postfix) with ESMTP id 7F575F52; Tue, 4 Dec 2018 19:42:52 -0500 (EST) Received: from mailfrontend1 ([10.202.2.162]) by compute3.internal (MEProxy); Tue, 04 Dec 2018 19:42:53 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=who-t.net; h= from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; s=fm1; bh=f6T5afCfbSIx/ IZSw2eDCVOPTs4vfPtmyp4UlGxir3g=; b=GgrYvSUSV1D6R2TasBIju2SRun1Yi IZFvoIOcvoOKF+4iFedP5XoyUyvVUMT+LD3KXh+kSTWZRNw7b7updcVtKFxlNoXt EnBVuOmIOfZRFaMmU44MJtxhdyTy8yDJKbXGu2XHe7FPtgeHtTnMXlsz08X7rd38 aUgF4EvklF43Cfx7Jhe7wXSfkmrbLH/ANXfX8+hJQcg9J/wX+Vwb+lxqSEW20KOi uGpRx44R0IFh3QqHXbsY33n/hxi5n5mEprEPfL1UqdNpkajSi2cKxslrMFg3GxFH A4oR+BtQPpkeX4ZTMnDQCCimZd1LMDRGBpoVDHGS6eMYkeRNtI/j4v3Zg== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:date:from :in-reply-to:message-id:mime-version:references:subject:to :x-me-proxy:x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s= fm1; bh=f6T5afCfbSIx/IZSw2eDCVOPTs4vfPtmyp4UlGxir3g=; b=bytmm5Dh pkmwfpjMIsTP2EOMNc7U/IaZQY2Ff71fpAstvQDLx8z985x8kSE/kPk54a6yuJCx HOk6tJvrUd/RAqhCGnt0HWI+mYFwPooUg+kyXMLGBFAeGUpIaCQVXJOT6ofV5TcP etmCX2YI7q54IQqoSZ72uD6PHNtjMmyYnNlm0TzQbERVUKmQ7nvONzgBoDp+muGx 5FVmZhFJ+gtGTySe38dQEE8uTlqf2fuEUowi4hZZYDHkB+nui+KhEziUT66uBlP3 kx51zxp2K84bLCYldPfaIJtPwSHmRsUmpB8ru2FPH9m2tEnaTEqIT58lHaHxON07 KD5vVs4568vkNg== X-ME-Sender: X-ME-Proxy: Received: from jelly.home.gateway (167-179-166-29.a7b3a6.bne.nbn.aussiebb.net [167.179.166.29]) by mail.messagingengine.com (Postfix) with ESMTPA id 42F0FE48FA; Tue, 4 Dec 2018 19:42:49 -0500 (EST) From: Peter Hutterer To: linux-input@vger.kernel.org Cc: Dmitry Torokhov , Jiri Kosina , Harry Cutts , torvalds@linux-foundation.org, Nestor Lopez Casado , linux-kernel@vger.kernel.org, Benjamin Tissoires Subject: [PATCH v3 1/8] Input: add `REL_WHEEL_HI_RES` and `REL_HWHEEL_HI_RES` Date: Wed, 5 Dec 2018 10:42:21 +1000 Message-Id: <20181205004228.10714-2-peter.hutterer@who-t.net> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20181205004228.10714-1-peter.hutterer@who-t.net> References: <20181205004228.10714-1-peter.hutterer@who-t.net> MIME-Version: 1.0 Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This event code represents scroll reports from high-resolution wheels and is modelled after the approach Windows uses. The value 120 is one detent (wheel click) of movement. Mice with higher-resolution scrolling can send fractions of 120 which must be accumulated in userspace. Userspace can either wait for a full 120 to accumulate or scroll by fractions of one logical scroll movement as the events come in. 120 was picked as magic number because it has a high number of integer fractions that can be used by high-resolution wheels. For more information see https://docs.microsoft.com/en-us/previous-versions/windows/hardware/design/dn613912(v=vs.85) These new axes obsolete REL_WHEEL and REL_HWHEEL. The legacy axes are emulated by the kernel but the most accurate (and most granular) data is available through the new axes. Signed-off-by: Peter Hutterer Acked-by: Dmitry Torokhov --- No changes since v1 Documentation/input/event-codes.rst | 21 ++++++++++++++++++++- include/uapi/linux/input-event-codes.h | 2 ++ 2 files changed, 22 insertions(+), 1 deletion(-) diff --git a/Documentation/input/event-codes.rst b/Documentation/input/event-codes.rst index a8c0873beb95..b24b5343f5eb 100644 --- a/Documentation/input/event-codes.rst +++ b/Documentation/input/event-codes.rst @@ -190,7 +190,26 @@ A few EV_REL codes have special meanings: * REL_WHEEL, REL_HWHEEL: - These codes are used for vertical and horizontal scroll wheels, - respectively. + respectively. The value is the number of detents moved on the wheel, the + physical size of which varies by device. For high-resolution wheels + this may be an approximation based on the high-resolution scroll events, + see REL_WHEEL_HI_RES. These event codes are legacy codes and + REL_WHEEL_HI_RES and REL_HWHEEL_HI_RES should be preferred where + available. + +* REL_WHEEL_HI_RES, REL_HWHEEL_HI_RES: + + - High-resolution scroll wheel data. The accumulated value 120 represents + movement by one detent. For devices that do not provide high-resolution + scrolling, the value is always a multiple of 120. For devices with + high-resolution scrolling, the value may be a fraction of 120. + + If a vertical scroll wheel supports high-resolution scrolling, this code + will be emitted in addition to REL_WHEEL or REL_HWHEEL. The REL_WHEEL + and REL_HWHEEL may be an approximation based on the high-resolution + scroll events. There is no guarantee that the high-resolution data + is a multiple of 120 at the time of an emulated REL_WHEEL or REL_HWHEEL + event. EV_ABS ------ diff --git a/include/uapi/linux/input-event-codes.h b/include/uapi/linux/input-event-codes.h index 3eb5a4c3d60a..265ef2028660 100644 --- a/include/uapi/linux/input-event-codes.h +++ b/include/uapi/linux/input-event-codes.h @@ -716,6 +716,8 @@ * the situation described above. */ #define REL_RESERVED 0x0a +#define REL_WHEEL_HI_RES 0x0b +#define REL_HWHEEL_HI_RES 0x0c #define REL_MAX 0x0f #define REL_CNT (REL_MAX+1)