From patchwork Mon Jan 31 14:35:36 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 12730726 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6CCF5C433EF for ; Mon, 31 Jan 2022 14:35:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237045AbiAaOf5 (ORCPT ); Mon, 31 Jan 2022 09:35:57 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:21404 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237185AbiAaOf5 (ORCPT ); Mon, 31 Jan 2022 09:35:57 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1643639756; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ZrOPbfheWkNBX1SvXTkYbq9LsIXt4iOVqpKlJV0f9dw=; b=TWOdHHVmT/5z6E3aOI+lxGjZNs8OIt4KVz1cX3yWf+oPMpCAZRoPxtaazETheYSzV8oUF2 9K5Wujey0lNZo9auqSHltQuxNpMASe/OQMktR5xqIUIE/l/jBFJOScifbPyUHdH2iBBsGw XhoRU/kb7JdHT4MW/GsYyHOnjQSFV1M= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-364-I8fUYB3hNdCQlYRTyvuwmw-1; Mon, 31 Jan 2022 09:35:54 -0500 X-MC-Unique: I8fUYB3hNdCQlYRTyvuwmw-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id EBC5481F019; Mon, 31 Jan 2022 14:35:53 +0000 (UTC) Received: from x1.localdomain.com (unknown [10.39.194.59]) by smtp.corp.redhat.com (Postfix) with ESMTP id 94FD22C2C4; Mon, 31 Jan 2022 14:35:52 +0000 (UTC) From: Hans de Goede To: Dmitry Torokhov Cc: Hans de Goede , Bastien Nocera , linux-input@vger.kernel.org Subject: [PATCH v2 2/5] Input: Add input_copy_abs() function Date: Mon, 31 Jan 2022 15:35:36 +0100 Message-Id: <20220131143539.109142-2-hdegoede@redhat.com> In-Reply-To: <20220131143539.109142-1-hdegoede@redhat.com> References: <20220131143539.109142-1-hdegoede@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Add a new helper function to copy absinfo from one input_dev to another input_dev. This is useful to e.g. setup a pen/stylus input-device for combined touchscreen/pen hardware where the pen uses the same coordinates as the touchscreen. Suggested-by: Dmitry Torokhov Signed-off-by: Hans de Goede --- Changes in v2: - Check src has EV_ABS and src_axis bits set (and WARN when not) - Use input_set_capability() --- drivers/input/input.c | 36 ++++++++++++++++++++++++++++++++++++ include/linux/input.h | 2 ++ 2 files changed, 38 insertions(+) diff --git a/drivers/input/input.c b/drivers/input/input.c index 3a5156012fb8..4456e82d370b 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -526,6 +526,42 @@ void input_set_abs_params(struct input_dev *dev, unsigned int axis, } EXPORT_SYMBOL(input_set_abs_params); +/** + * input_copy_abs - Copy absinfo from one input_dev to another + * @dst: Destination input device to copy the abs settings to + * @dst_axis: ABS_* value selecting the destination axis + * @src: Source input device to copy the abs settings from + * @src_axis: ABS_* value selecting the source axis + * + * Set absinfo for the selected destination axis by copying it from + * the specified source input device's source axis. + * This is useful to e.g. setup a pen/stylus input-device for combined + * touchscreen/pen hardware where the pen uses the same coordinates as + * the touchscreen. + */ +void input_copy_abs(struct input_dev *dst, unsigned int dst_axis, + const struct input_dev *src, unsigned int src_axis) +{ + /* src must have EV_ABS and src_axis set */ + if (WARN_ON(!(test_bit(EV_ABS, src->evbit) && + test_bit(src_axis, src->absbit)))) + return; + + /* + * input_alloc_absinfo() may have failed for the source. Our caller is + * expected to catch this when registering the input devices, which may + * happen after the input_copy_abs() call. + */ + if (!src->absinfo) + return; + + input_set_capability(dst, EV_ABS, dst_axis); + if (!dst->absinfo) + return; + + dst->absinfo[dst_axis] = src->absinfo[src_axis]; +} +EXPORT_SYMBOL(input_copy_abs); /** * input_grab_device - grabs device for exclusive use diff --git a/include/linux/input.h b/include/linux/input.h index 0354b298d874..49790c1bd2c4 100644 --- a/include/linux/input.h +++ b/include/linux/input.h @@ -475,6 +475,8 @@ static inline void input_set_events_per_packet(struct input_dev *dev, int n_even void input_alloc_absinfo(struct input_dev *dev); void input_set_abs_params(struct input_dev *dev, unsigned int axis, int min, int max, int fuzz, int flat); +void input_copy_abs(struct input_dev *dst, unsigned int dst_axis, + const struct input_dev *src, unsigned int src_axis); #define INPUT_GENERATE_ABS_ACCESSORS(_suffix, _item) \ static inline int input_abs_get_##_suffix(struct input_dev *dev, \