From patchwork Mon Jan 18 00:34:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Scally X-Patchwork-Id: 1427923 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20161025 header.b=QzL/Nu1C; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4DJtDt2Xq3z9sW0 for ; Mon, 18 Jan 2021 11:38:22 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730732AbhARAh1 (ORCPT ); Sun, 17 Jan 2021 19:37:27 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44432 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730507AbhARAfY (ORCPT ); Sun, 17 Jan 2021 19:35:24 -0500 Received: from mail-wr1-x42d.google.com (mail-wr1-x42d.google.com [IPv6:2a00:1450:4864:20::42d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 54217C061575; Sun, 17 Jan 2021 16:34:44 -0800 (PST) Received: by mail-wr1-x42d.google.com with SMTP id c5so14846553wrp.6; Sun, 17 Jan 2021 16:34:44 -0800 (PST) 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=oxyOObT1sg5s9bWkUVceIGz0KKXfziZMqNtmhxIBUsg=; b=QzL/Nu1C+vMnHFaRThEDIZe5Ncq5Of2W3gkYCJnm8AmU7SESXNgasBnk8UNZDddGaQ NY2UFS1U4m8+RsHxWIsXCuHC55DliW48CVdjoyr/Hcn1plYmlhE+l47VbBxLoz8itTu2 aZo45y9QldNIOq5Rzwd+s1ivBqcKHiGqlxioGfubLKYAdjh4m37/fcMJWFQus9zOugXS c2PKC6sAQ6Am6/ejcfKwnxansf6BufsA8GzXsQYwjgJtbZ4C5jlb8HNHBXaD+lJ3jQiN ZY1wZFnmzKWrxFBPslIqd9GIVPEHI3y+LjYJCjN6WD5tpfhV22TIdQt7X/v833C874MM pfbg== 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=oxyOObT1sg5s9bWkUVceIGz0KKXfziZMqNtmhxIBUsg=; b=NyUYXtlmW9rx/aHp6K/xozCJP1rNchifLWx8LL2ebFjUiWvoVSLsk1RbIDOvTeQ24j j10xNCp0SgDwk49PNcAHhCB4fw2fGb9cw3FaTOGpA8qyTcDO/6FY3GxVj7tiayEApjzA S+e6qmLaINLFsTsEBgKVFvYBtG79IFxlTd0bHCsCCmKko13TKEssjxzDWrQ55oG1wiKo Rld9R4CZwZ33/2j8tk4TPi1b+SFyulvutqvwuL1TiHMXeB1UptDCe3fJBeGH+R7raLSt uklrwOV/GOc18nJmXmaBcqOYr7yw8TNYOAiFWQkZgzE4wcio3kkU5hfQ6xNU2Lt/jDwU 2gGA== X-Gm-Message-State: AOAM530nHKW984q5KIRC22FxPYRyxBzOE9tmt8LOu364uVfUnYKkXtbx Gvlk/LFBsz5Gwrztb6GyYckTT3dA2ylOwA== X-Google-Smtp-Source: ABdhPJwP8X4dWttjUj1Bb2v8rxhV65TD73lpEEX+TkikPku+vK0TaGlSy9mss5ow/8gIZF3SXV9r4Q== X-Received: by 2002:adf:cc81:: with SMTP id p1mr23185951wrj.339.1610930083018; Sun, 17 Jan 2021 16:34:43 -0800 (PST) Received: from valhalla.home ([2.29.208.120]) by smtp.gmail.com with ESMTPSA id o124sm23642040wmb.5.2021.01.17.16.34.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 17 Jan 2021 16:34:42 -0800 (PST) From: Daniel Scally To: 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: rjw@rjwysocki.net, lenb@kernel.org, andy@kernel.org, mika.westerberg@linux.intel.com, linus.walleij@linaro.org, bgolaszewski@baylibre.com, wsa@kernel.org, lee.jones@linaro.org, hdegoede@redhat.com, mgross@linux.intel.com, robert.moore@intel.com, erik.kaneda@intel.com, sakari.ailus@linux.intel.com, andriy.shevchenko@linux.intel.com, laurent.pinchart@ideasonboard.com, kieran.bingham@ideasonboard.com Subject: [PATCH v2 2/7] acpi: utils: Add function to fetch dependent acpi_devices Date: Mon, 18 Jan 2021 00:34:23 +0000 Message-Id: <20210118003428.568892-3-djrscally@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210118003428.568892-1-djrscally@gmail.com> References: <20210118003428.568892-1-djrscally@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@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 function to parse all ACPI Devices and check if the include the handle of the dependee device in their _DEP buffer. Signed-off-by: Daniel Scally Reviewed-by: Laurent Pinchart --- Changes in v2: - Used acpi_lpss_dep() as Andy suggested. drivers/acpi/utils.c | 34 ++++++++++++++++++++++++++++++++++ include/acpi/acpi_bus.h | 2 ++ 2 files changed, 36 insertions(+) diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c index 78b38775f18b..ec6a2406a886 100644 --- a/drivers/acpi/utils.c +++ b/drivers/acpi/utils.c @@ -831,6 +831,18 @@ bool acpi_lpss_dep(struct acpi_device *adev, acpi_handle handle) return false; } +static int acpi_dev_match_by_dep(struct device *dev, const void *data) +{ + struct acpi_device *adev = to_acpi_device(dev); + const struct acpi_device *dependee = data; + acpi_handle handle = dependee->handle; + + if (acpi_lpss_dep(adev, handle)) + return 1; + + return 0; +} + /** * acpi_dev_present - Detect that a given ACPI device is present * @hid: Hardware ID of the device. @@ -866,6 +878,28 @@ bool acpi_dev_present(const char *hid, const char *uid, s64 hrv) } EXPORT_SYMBOL(acpi_dev_present); +/** + * acpi_dev_get_next_dep_dev - Return next ACPI device dependent on input dev + * @adev: Pointer to the dependee device + * @prev: Pointer to the previous dependent device (or NULL for first match) + * + * Return the next ACPI device which declares itself dependent on @adev in + * the _DEP buffer. + * + * The caller is responsible to call put_device() on the returned device. + */ +struct acpi_device *acpi_dev_get_next_dep_dev(struct acpi_device *adev, + struct acpi_device *prev) +{ + struct device *start = prev ? &prev->dev : NULL; + struct device *dev; + + dev = bus_find_device(&acpi_bus_type, start, adev, acpi_dev_match_by_dep); + + return dev ? to_acpi_device(dev) : NULL; +} +EXPORT_SYMBOL(acpi_dev_get_next_dep_dev); + /** * acpi_dev_get_next_match_dev - Return the next match of ACPI device * @adev: Pointer to the previous acpi_device matching this @hid, @uid and @hrv diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index 02a716a0af5d..33deb22294f2 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -683,6 +683,8 @@ 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); +struct acpi_device * +acpi_dev_get_next_dep_dev(struct acpi_device *adev, struct acpi_device *prev); struct acpi_device * acpi_dev_get_next_match_dev(struct acpi_device *adev, const char *hid, const char *uid, s64 hrv); struct acpi_device *