From patchwork Thu Feb 3 14:32:17 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Tissoires X-Patchwork-Id: 539764 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 4D601C433EF for ; Thu, 3 Feb 2022 14:33:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351203AbiBCOdG (ORCPT ); Thu, 3 Feb 2022 09:33:06 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:48081 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242938AbiBCOdF (ORCPT ); Thu, 3 Feb 2022 09:33:05 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1643898785; 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=Csg0k3JN5nLMfOor1DtTmLyZk4+42tuFkOSOtb2Gq2o=; b=YyLFSTXJIGWYEBfBBIymEP7DA2f0+LnAxqE7PnnzR/nC5sNywiyBSltGx4ft+UMgm++hoj +6MACEXOEVd1Mr4+lFMATrn544yWVnzZ/JRv3xMXFgtoLvT+5SRRjoz88N25J5Jy7EupA6 AWZDLwHJYklZY2Spw90KwjaMOqlh5H4= 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-160-7emSeU2TP1qlj38pePhVeQ-1; Thu, 03 Feb 2022 09:33:02 -0500 X-MC-Unique: 7emSeU2TP1qlj38pePhVeQ-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 74FE318C89DA; Thu, 3 Feb 2022 14:33:00 +0000 (UTC) Received: from plouf.redhat.com (unknown [10.39.192.114]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0638E7D5B2; Thu, 3 Feb 2022 14:32:44 +0000 (UTC) From: Benjamin Tissoires To: Jiri Kosina , Dmitry Torokhov , Jonathan Corbet , =?utf-8?q?Ahelenia_Ziemia=C5=84ska?= , Ping Cheng , Aaron Armstrong Skomra , Jason Gerecke , Peter Hutterer Cc: linux-input@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Benjamin Tissoires Subject: [PATCH v2 03/12] HID: core: split data fetching from processing in hid_input_field() Date: Thu, 3 Feb 2022 15:32:17 +0100 Message-Id: <20220203143226.4023622-4-benjamin.tissoires@redhat.com> In-Reply-To: <20220203143226.4023622-1-benjamin.tissoires@redhat.com> References: <20220203143226.4023622-1-benjamin.tissoires@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-input@vger.kernel.org This is a preparatory patch for being able to process the usages out of order. We split the retrieval of the data in a separate function and also split out the processing of the usages depending if the field is an array or a variable. No functional changes from this patch. Signed-off-by: Benjamin Tissoires --- drivers/hid/hid-core.c | 96 +++++++++++++++++++++++++++++++++--------- include/linux/hid.h | 3 +- 2 files changed, 79 insertions(+), 20 deletions(-) diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index fad4dbdf6391..34188d7ac0f7 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -1544,13 +1544,12 @@ static inline int hid_array_value_is_valid(struct hid_field *field, } /* - * Analyse a received field, and fetch the data from it. The field - * content is stored for next report processing (we do differential - * reporting to the layer). + * Fetch the field from the data. The field content is stored for next + * report processing (we do differential reporting to the layer). */ - -static void hid_input_field(struct hid_device *hid, struct hid_field *field, - __u8 *data, int interrupt) +static void hid_input_fetch_field(struct hid_device *hid, + struct hid_field *field, + __u8 *data) { unsigned n; unsigned count = field->report_count; @@ -1561,6 +1560,7 @@ static void hid_input_field(struct hid_device *hid, struct hid_field *field, value = field->new_value; memset(value, 0, count * sizeof(__s32)); + field->ignored = false; for (n = 0; n < count; n++) { @@ -1572,21 +1572,56 @@ static void hid_input_field(struct hid_device *hid, struct hid_field *field, /* Ignore report if ErrorRollOver */ if (!(field->flags & HID_MAIN_ITEM_VARIABLE) && hid_array_value_is_valid(field, value[n]) && - field->usage[value[n] - min].hid == HID_UP_KEYBOARD + 1) + field->usage[value[n] - min].hid == HID_UP_KEYBOARD + 1) { + field->ignored = true; return; + } } +} - for (n = 0; n < count; n++) { +/* + * Process a received variable field. + */ - if (HID_MAIN_ITEM_VARIABLE & field->flags) { - hid_process_event(hid, - field, - &field->usage[n], - value[n], - interrupt); - continue; - } +static void hid_input_var_field(struct hid_device *hid, + struct hid_field *field, + int interrupt) +{ + unsigned int count = field->report_count; + __s32 *value = field->new_value; + unsigned int n; + + for (n = 0; n < count; n++) + hid_process_event(hid, + field, + &field->usage[n], + value[n], + interrupt); + + memcpy(field->value, value, count * sizeof(__s32)); +} +/* + * Process a received array field. The field content is stored for + * next report processing (we do differential reporting to the layer). + */ + +static void hid_input_array_field(struct hid_device *hid, + struct hid_field *field, + int interrupt) +{ + unsigned int n; + unsigned int count = field->report_count; + __s32 min = field->logical_minimum; + __s32 *value; + + value = field->new_value; + + /* ErrorRollOver */ + if (field->ignored) + return; + + for (n = 0; n < count; n++) { if (hid_array_value_is_valid(field, field->value[n]) && search(value, field->value[n], count)) hid_process_event(hid, @@ -1607,6 +1642,31 @@ static void hid_input_field(struct hid_device *hid, struct hid_field *field, memcpy(field->value, value, count * sizeof(__s32)); } +/* + * Analyse a received report, and fetch the data from it. The field + * content is stored for next report processing (we do differential + * reporting to the layer). + */ +static void hid_process_report(struct hid_device *hid, + struct hid_report *report, + __u8 *data, + int interrupt) +{ + unsigned int a; + struct hid_field *field; + + for (a = 0; a < report->maxfield; a++) { + field = report->field[a]; + + hid_input_fetch_field(hid, field, data); + + if (field->flags & HID_MAIN_ITEM_VARIABLE) + hid_input_var_field(hid, field, interrupt); + else + hid_input_array_field(hid, field, interrupt); + } +} + /* * Output the field into the report. */ @@ -1768,7 +1828,6 @@ int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, u32 size, struct hid_report_enum *report_enum = hid->report_enum + type; struct hid_report *report; struct hid_driver *hdrv; - unsigned int a; u32 rsize, csize = size; u8 *cdata = data; int ret = 0; @@ -1804,8 +1863,7 @@ int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, u32 size, } if (hid->claimed != HID_CLAIMED_HIDRAW && report->maxfield) { - for (a = 0; a < report->maxfield; a++) - hid_input_field(hid, report->field[a], cdata, interrupt); + hid_process_report(hid, report, cdata, interrupt); hdrv = hid->driver; if (hdrv && hdrv->report) hdrv->report(hid, report); diff --git a/include/linux/hid.h b/include/linux/hid.h index 3fbfe0986659..cf79eb3da465 100644 --- a/include/linux/hid.h +++ b/include/linux/hid.h @@ -342,7 +342,7 @@ struct hid_item { * HID device quirks. */ -/* +/* * Increase this if you need to configure more HID quirks at module load time */ #define MAX_USBHID_BOOT_QUIRKS 4 @@ -483,6 +483,7 @@ struct hid_field { __s32 physical_maximum; __s32 unit_exponent; unsigned unit; + bool ignored; /* this field is ignored in this event */ struct hid_report *report; /* associated report */ unsigned index; /* index into report->field[] */ /* hidinput data */