From patchwork Thu May 20 14:09:24 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Scally X-Patchwork-Id: 443596 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 752BAC43470 for ; Thu, 20 May 2021 14:12:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 559D161279 for ; Thu, 20 May 2021 14:12:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243757AbhETON1 (ORCPT ); Thu, 20 May 2021 10:13:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50978 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239356AbhETOMj (ORCPT ); Thu, 20 May 2021 10:12:39 -0400 Received: from mail-wr1-x431.google.com (mail-wr1-x431.google.com [IPv6:2a00:1450:4864:20::431]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B0D09C061360; Thu, 20 May 2021 07:09:46 -0700 (PDT) Received: by mail-wr1-x431.google.com with SMTP id j14so16089455wrq.5; Thu, 20 May 2021 07:09:46 -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=KDoc5xeYWeYU512Wm3d18mdOADpuvy7ld0OqNa7izfs=; b=BisTvPuF4Xk2mSdE5bIv/gwo9hRcuiQbs2gjplPiPe0+aURCkd8g5ddQulG0eLfIwT /FkKERmDOu6qQ4mwzf0HFSHxHafK/rFzBhPwTVeuif0u/IlR+fFglDbJGZkJ9i2moplY +bASBUvQ0jO3iO1iA7WHSKU2sZQn0cNOaGtJyscw2LoULIozDXY0G1sfPLzI7pZiL+/9 oPMoQR6xQhhhw1HSMgNWkOYFxl018A8rTjvjfwkUeMcQCgBtusMSXJZ+haMfG0iUVQE2 4dsv40SMZf3dXutpohAs0o+LNrF/UbLRZ1ozgCl9+7UmAlzcASkIKYqXI/Q3BuObQcG2 uZtQ== 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=KDoc5xeYWeYU512Wm3d18mdOADpuvy7ld0OqNa7izfs=; b=W5vqVfy2/7VsTWhz2om8+GiJYIbSWkKQzBAw9tX0vT11FlvuZV5Gv6VLgMgUiNX7hx Asjo32oGwf1mzHE4u1BYEnmfk4ByKTPMnfXH17jmB715kZi/PpiyRqMGmaxIORl6NzBE uZg29QlBCTvgb5S9YuPQUPO3zqM6LzMSF1ljwPBT3PoUozl5jFpCji9ZeE9cC0BF8jvL i0tDb1FxO0TVoWZ151sJdTHwKyUixvrGwmkv9R1Ee3fms0gWRqvMWaIiAfLsA9zaQRXE U0Z8jO8GqIgTTqCnPDR12fYHB8NGzQ0CaF0jh3YNkl5Yb9c+OjNACLmH/6dtSex3e+xX wyyg== X-Gm-Message-State: AOAM532EKM3u4+ob6X0Iqi7LzdkTpvUFtFGrACD8SFu92K6yMijU9NPM tiMBc9hHU5wMndDs0rylMZQ= X-Google-Smtp-Source: ABdhPJxA2TbO813ryCP8bj191enw1wM7kxjE/0km1fqqMpYb8222YuAkdkbYQKcuug/tVCPHtfDGpg== X-Received: by 2002:adf:9d8c:: with SMTP id p12mr4625583wre.310.1621519785265; Thu, 20 May 2021 07:09:45 -0700 (PDT) Received: from valhalla.home ([91.110.20.117]) by smtp.gmail.com with ESMTPSA id m6sm8411974wml.3.2021.05.20.07.09.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 May 2021 07:09:44 -0700 (PDT) From: Daniel Scally To: "Rafael J . Wysocki" , Andy Shevchenko , Daniel Scally , Wolfram Sang , Lee Jones , Hans de Goede , Maximilian Luz , linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.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 , Russell King , Linus Walleij , Bartosz Golaszewski , Mark Gross , Robert Moore , Erik Kaneda , laurent.pinchart@ideasonboard.com, kieran.bingham@ideasonboard.com, Andy Shevchenko Subject: [PATCH v4 4/8] gpiolib: acpi: Export acpi_get_gpiod() Date: Thu, 20 May 2021 15:09:24 +0100 Message-Id: <20210520140928.3252671-5-djrscally@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210520140928.3252671-1-djrscally@gmail.com> References: <20210520140928.3252671-1-djrscally@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org We need to be able to translate GPIO resources in an ACPI device's _CRS into GPIO descriptor array. Those are represented in _CRS as a pathname to a GPIO device plus the pin's index number: the acpi_get_gpiod() function is perfect for that purpose. As it's currently only used internally within the GPIO layer, provide and export a wrapper function that additionally holds a reference to the GPIO device. Reviewed-by: Andy Shevchenko Signed-off-by: Daniel Scally --- Changes since v3: - Renamed function to acpi_get_and_request_gpiod() - and no longer renaming acpi_get_gpiod() drivers/gpio/gpiolib-acpi.c | 28 ++++++++++++++++++++++++++++ include/linux/gpio/consumer.h | 2 ++ 2 files changed, 30 insertions(+) diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c index 5b4111e4be3f..684ddb35d83b 100644 --- a/drivers/gpio/gpiolib-acpi.c +++ b/drivers/gpio/gpiolib-acpi.c @@ -128,6 +128,34 @@ static struct gpio_desc *acpi_get_gpiod(char *path, int pin) return gpiochip_get_desc(chip, pin); } +/** + * acpi_get_and_request_gpiod() - Translate ACPI GPIO pin to GPIO descriptor + * and hold a refcount to the GPIO device. + * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1") + * @pin: ACPI GPIO pin number (0-based, controller-relative) + * @label: Label to pass to gpiod_request() + * + * This function is a simple pass-through to acpi_get_gpiod(), except that + * as it is intended for use outside of the GPIO layer (in a similar fashion to + * gpiod_get_index() for example) it also holds a reference to the GPIO device. + */ +struct gpio_desc *acpi_get_and_request_gpiod(char *path, int pin, char *label) +{ + struct gpio_desc *gpio; + int ret; + + gpio = acpi_get_gpiod(path, pin); + if (IS_ERR(gpio)) + return gpio; + + ret = gpiod_request(gpio, label); + if (ret) + return ERR_PTR(ret); + + return gpio; +} +EXPORT_SYMBOL_GPL(acpi_get_and_request_gpiod); + static irqreturn_t acpi_gpio_irq_handler(int irq, void *data) { struct acpi_gpio_event *event = data; diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h index c73b25bc9213..566feb56601f 100644 --- a/include/linux/gpio/consumer.h +++ b/include/linux/gpio/consumer.h @@ -692,6 +692,8 @@ int devm_acpi_dev_add_driver_gpios(struct device *dev, const struct acpi_gpio_mapping *gpios); void devm_acpi_dev_remove_driver_gpios(struct device *dev); +struct gpio_desc *acpi_get_and_request_gpiod(char *path, int pin, char *label); + #else /* CONFIG_GPIOLIB && CONFIG_ACPI */ struct acpi_device;