From patchwork Mon Nov 30 13:31:25 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Scally X-Patchwork-Id: 334907 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 0F323C8302F for ; Mon, 30 Nov 2020 13:34:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A831320855 for ; Mon, 30 Nov 2020 13:34:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="f0hTX38W" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726970AbgK3NdU (ORCPT ); Mon, 30 Nov 2020 08:33:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38602 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726316AbgK3NdS (ORCPT ); Mon, 30 Nov 2020 08:33:18 -0500 Received: from mail-wr1-x443.google.com (mail-wr1-x443.google.com [IPv6:2a00:1450:4864:20::443]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1539CC061A51; Mon, 30 Nov 2020 05:32:16 -0800 (PST) Received: by mail-wr1-x443.google.com with SMTP id r3so16246791wrt.2; Mon, 30 Nov 2020 05:32:16 -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=g3BMXw9JzXtFm16YDoDU8hR3/fKFvazRWYpnvqcHgAY=; b=f0hTX38WWoYFOqduIv8btPWQeeYXnpvQT0AKV2DDZ116iEm5JP+YpIbA3czDOvy1oI obkFPRnUjDfiJaPS9g4M7+yHNIeMXc6tWNwgTi/ZCp/2wvvVoavHx5mJ3+T+YhlVDH4Y UlWwoPadkMAF/1W74cggIXpoD8Rx6+r1IG0mm0NLiRssof/Oo2HjpJLpfJt36TLWGCkl uvQcBwzlh794D+3V/6d4aOGSKMFglZbKF2hCdd8CJElgla5M2GilkvV6sSwXqpW/MAL8 F9sqikgb2+/DBlTINJ+Zpb0DiEHAecd+4i+A5U3QiFYX7LloHZYnR6VWHLpKkhasrEkY yYSQ== 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=g3BMXw9JzXtFm16YDoDU8hR3/fKFvazRWYpnvqcHgAY=; b=T/fL5sa8bTL1QNUlynW360oRyFWrk2BBmksnygFm4Rqpi4khfZnDg5SeAU2xzma3RR njkfpoSFmujQYz/f/5iOGwHuZkZzOUh/jXE0UNckdoqlTc7ZTFgC0Is1net1FYj+G/Iv r59HEnIb+sTvuC6NsHJmcRJOX+bwfi9oZzx/puwvO4o4ohnlHSAHETCFi5tclvSk6+gu 6DAQ6HukHCWT9QC2/XzdfurmdHBEsQSyQ6onzCkgrTkgwSxTjov+Lc0SeLhahWUCjdYH +UOA19D7ly09VKrv649VMuo6U7Y9dt/O9KABozPfef6h5fNrMX3XoQbCLFOeEA8VrXnh 9jDQ== X-Gm-Message-State: AOAM531c9/rs7WGkW1fuONtjh3Pc4BrdvlW5NED3/E0vWdGG6QH/vJw7 3CPS7qeGM/TVf1gDpnjDXGzctqmh9Ik9A/5G X-Google-Smtp-Source: ABdhPJzDCcxaoTO342dCdUscQv15sIxKHbckb9UWSMvt9SP2Hs4Rezs8wWCAwD8sNCiCr+Mm4eFlHA== X-Received: by 2002:adf:ecc9:: with SMTP id s9mr28663695wro.246.1606743133595; Mon, 30 Nov 2020 05:32:13 -0800 (PST) Received: from valhalla.home ([2.31.224.80]) by smtp.gmail.com with ESMTPSA id g192sm7452333wme.48.2020.11.30.05.32.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Nov 2020 05:32:12 -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, linux-media@vger.kernel.org, devel@acpica.org Cc: rjw@rjwysocki.net, lenb@kernel.org, gregkh@linuxfoundation.org, mika.westerberg@linux.intel.com, andriy.shevchenko@linux.intel.com, linus.walleij@linaro.org, bgolaszewski@baylibre.com, wsa@kernel.org, yong.zhi@intel.com, sakari.ailus@linux.intel.com, bingbu.cao@intel.com, tian.shu.qiu@intel.com, mchehab@kernel.org, robert.moore@intel.com, erik.kaneda@intel.com, pmladek@suse.com, rostedt@goodmis.org, sergey.senozhatsky@gmail.com, linux@rasmusvillemoes.dk, kieran.bingham+renesas@ideasonboard.com, jacopo+renesas@jmondi.org, laurent.pinchart+renesas@ideasonboard.com, jorhand@linux.microsoft.com, kitakar@gmail.com, heikki.krogerus@linux.intel.com Subject: [PATCH 14/18] acpi: utils: Add function to fetch dependent acpi_devices Date: Mon, 30 Nov 2020 13:31:25 +0000 Message-Id: <20201130133129.1024662-15-djrscally@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201130133129.1024662-1-djrscally@gmail.com> References: <20201130133129.1024662-1-djrscally@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org ACPI devices declare themselves dependent on other devices via the _DEP buffer. Fetching the dependee from dependent is a matter of parsing _DEP, but currently there's no method to fetch dependent from dependee. Add one, so we can parse sensors dependent on a PMIC from the PMIC's acpi_driver. Signed-off-by: Daniel Scally --- Changes since RFC v3: - Patch introduced drivers/acpi/utils.c | 68 +++++++++++++++++++++++++++++++++++++++++ include/acpi/acpi_bus.h | 2 ++ 2 files changed, 70 insertions(+) diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c index c177165c8db2..7099529121db 100644 --- a/drivers/acpi/utils.c +++ b/drivers/acpi/utils.c @@ -807,6 +807,52 @@ static int acpi_dev_match_cb(struct device *dev, const void *data) return hrv == match->hrv; } +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; + struct acpi_handle_list dep_handles; + struct acpi_device *candidate; + acpi_handle handle; + acpi_status status; + unsigned int i; + int ret; + + handle = adev->handle; + + if (!acpi_has_method(handle, "_DEP")) + return 0; + + status = acpi_evaluate_reference(handle, "_DEP", NULL, &dep_handles); + if (ACPI_FAILURE(status)) + return 0; + + for (i = 0; i < dep_handles.count; i++) { + struct acpi_device_info *info; + + status = acpi_get_object_info(dep_handles.handles[i], &info); + if (ACPI_FAILURE(status)) + continue; + + if (info->valid & ACPI_VALID_HID) { + ret = acpi_bus_get_device(dep_handles.handles[i], &candidate); + if (ret || !candidate) { + kfree(info); + continue; + } + + if (candidate == dependee) { + acpi_dev_put(candidate); + kfree(info); + return 1; + } + + kfree(info); + } + } + return 0; +} + /** * acpi_dev_present - Detect that a given ACPI device is present * @hid: Hardware ID of the device. @@ -842,6 +888,28 @@ 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 0a028ba967d3..f5dfeb030b9c 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -688,6 +688,8 @@ 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 *