From patchwork Thu Jun 3 22:40:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Scally X-Patchwork-Id: 453614 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,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 A20EEC4709A for ; Thu, 3 Jun 2021 22:41:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 91198613D8 for ; Thu, 3 Jun 2021 22:41:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229916AbhFCWnT (ORCPT ); Thu, 3 Jun 2021 18:43:19 -0400 Received: from mail-wr1-f52.google.com ([209.85.221.52]:33686 "EHLO mail-wr1-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229620AbhFCWnS (ORCPT ); Thu, 3 Jun 2021 18:43:18 -0400 Received: by mail-wr1-f52.google.com with SMTP id a20so7421744wrc.0; Thu, 03 Jun 2021 15:41:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=nvI/xJn+zNjZ5L1MPeKPb1oyyFE33mVgV745ZMdAF50=; b=k42izcCLvhCKdJnbAxoaQ032H+mdbsho5piDKxueB9Hv77hIawXJbbH4Gm8G60G8O9 Bu+pyqIrKVeYAuNMezslTvOJvXIxukLBEBn5Z0wUt7Rfg2YZrGpvE0ptlQgYfIkoKo9C /F4LrjsEHVP3WzK5fCnNWB4eYeXOJlL1hU09anGpgSq+qW74CqFfDYlkiaaWEPF3UrcX bgtDUXW5cF7BeJec414+W8NnJYe0pITGbZ4+QePS2QzNtluG4PJwdpeSUY375t6ezWq5 3ckTKY0IdK448jMfAuLRnS5U0T7Oaa4YnVJlvoDmfD1SHsvWB7y32SG/xbGYvTKTnmbQ BAFQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=nvI/xJn+zNjZ5L1MPeKPb1oyyFE33mVgV745ZMdAF50=; b=YUoZNGfYzuFFeect5UoF51S4b3i7SndG4j6Xdu/4GGGtzzXoPIgHmTEhezXqF+8OqP Kw2SbnSS+zaVjbr7D21DcBzAYZTVoxrv+FqMmI9wsuZhsv8crXnXosxKZfhFScDvnHyp d4GyeyTAuxjpCGzxXu/hrrrT/sFV5gDx5EwxJlHdFxGZPuRe4V/lRxAX7H8Sk26v+/Vn LSkFuGHzbNi3ftfnrmPvQWfhBWk0jhx6tveuPAW0P+LZdXDAmhRn6Nzo7gaQZ/CdFRZs qNicZDlqnwaJbCYMZXhoWP+3AJuZlToTbWUTFT77SqEOh7u0CYwCFhXIY9LgJ5hujy2o N58Q== X-Gm-Message-State: AOAM532SGVUTObj4eAiyzSxtzFgHoSveasnQpyVTuhqAZ8zTbbEIOCUY IsecaM9ohzuzEYMmCSwjA7A= X-Google-Smtp-Source: ABdhPJwOxPUXTLCRJf2vNkCBOP09t5jhPt/e9brAgyLsSoZR2RYZU/OM42Fh/mUALcl17wkLZSBbfQ== X-Received: by 2002:a5d:5189:: with SMTP id k9mr618934wrv.319.1622760022693; Thu, 03 Jun 2021 15:40:22 -0700 (PDT) Received: from valhalla.home ([91.110.88.218]) by smtp.gmail.com with ESMTPSA id f14sm4612103wry.40.2021.06.03.15.40.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 03 Jun 2021 15:40:22 -0700 (PDT) From: Daniel Scally To: "Rafael J . Wysocki" , Andy Shevchenko , Daniel Scally , Lee Jones , Hans de Goede , Maximilian Luz , linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org, platform-driver-x86@vger.kernel.org, devel@acpica.org Cc: Len Brown , Mika Westerberg , Linus Walleij , Bartosz Golaszewski , Wolfram Sang , Mark Gross , Robert Moore , Erik Kaneda , laurent.pinchart@ideasonboard.com, kieran.bingham@ideasonboard.com, Andy Shevchenko Subject: [PATCH v5 2/6] ACPI: scan: Add function to fetch dependent of acpi device Date: Thu, 3 Jun 2021 23:40:03 +0100 Message-Id: <20210603224007.120560-3-djrscally@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210603224007.120560-1-djrscally@gmail.com> References: <20210603224007.120560-1-djrscally@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org In some ACPI tables we encounter, devices use the _DEP method to assert a dependence on other ACPI devices as opposed to the OpRegions that the specification intends. We need to be able to find those devices "from" the dependee, so add a callback and a wrapper to walk over the acpi_dep_list and return the dependent ACPI device. Reviewed-by: Andy Shevchenko Signed-off-by: Daniel Scally --- Changes since v5: - Functions renamed drivers/acpi/scan.c | 35 +++++++++++++++++++++++++++++++++++ include/acpi/acpi_bus.h | 1 + 2 files changed, 36 insertions(+) diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 195635c3462b..9af64c34e286 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -2105,6 +2105,20 @@ static void acpi_bus_attach(struct acpi_device *device, bool first_pass) device->handler->hotplug.notify_online(device); } +static int acpi_dev_get_first_consumer_dev_cb(struct acpi_dep_data *dep, void *data) +{ + struct acpi_device *adev; + + adev = acpi_bus_get_acpi_device(dep->consumer); + if (!adev) + /* If we don't find an adev then we want to continue parsing */ + return 0; + + *(struct acpi_device **)data = adev; + + return 1; +} + static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data) { struct acpi_device *adev; @@ -2168,6 +2182,27 @@ void acpi_dev_clear_dependencies(struct acpi_device *supplier) } EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies); +/** + * acpi_dev_get_first_consumer_dev - Return ACPI device dependent on @supplier + * @supplier: Pointer to the dependee device + * + * Returns the first &struct acpi_device which declares itself dependent on + * @supplier via the _DEP buffer, parsed from the acpi_dep_list. + * + * The caller is responsible for putting the reference to adev when it is no + * longer needed. + */ +struct acpi_device *acpi_dev_get_first_consumer_dev(struct acpi_device *supplier) +{ + struct acpi_device *adev = NULL; + + acpi_walk_dep_device_list(supplier->handle, + acpi_dev_get_first_consumer_dev_cb, &adev); + + return adev; +} +EXPORT_SYMBOL_GPL(acpi_dev_get_first_consumer_dev); + /** * acpi_bus_scan - Add ACPI device node objects in a given namespace scope. * @handle: Root of the namespace scope to scan. diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index 0b2c4f170f4d..4bed30e61c5b 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -692,6 +692,7 @@ static inline bool acpi_device_can_poweroff(struct acpi_device *adev) bool acpi_dev_hid_uid_match(struct acpi_device *adev, const char *hid2, const char *uid2); void acpi_dev_clear_dependencies(struct acpi_device *supplier); +struct acpi_device *acpi_dev_get_first_consumer_dev(struct acpi_device *supplier); struct acpi_device * acpi_dev_get_next_match_dev(struct acpi_device *adev, const char *hid, const char *uid, s64 hrv); struct acpi_device *