From patchwork Mon Feb 22 13:07:33 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Scally X-Patchwork-Id: 385944 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=-15.7 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 8F9DCC433E9 for ; Mon, 22 Feb 2021 13:11:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4F89E64EC3 for ; Mon, 22 Feb 2021 13:11:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231853AbhBVNKs (ORCPT ); Mon, 22 Feb 2021 08:10:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41458 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231838AbhBVNIm (ORCPT ); Mon, 22 Feb 2021 08:08:42 -0500 Received: from mail-wm1-x333.google.com (mail-wm1-x333.google.com [IPv6:2a00:1450:4864:20::333]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 363FCC06178C; Mon, 22 Feb 2021 05:07:55 -0800 (PST) Received: by mail-wm1-x333.google.com with SMTP id f137so329162wmf.3; Mon, 22 Feb 2021 05:07:55 -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=dbElsHfI9FiCGYMopDy9JUfpf6k+IONRCYc0n0ZtrWA=; b=LwEKG0enAUfqY9PBkbdb/b3D8cJPvPv1lV2DjHQtdkyYnkgDv2Mbxl9enjdZBx8Zyn fSDgl6g+cFr7aLYE2pyNyhMcvOv8yjkL0So0O60jkVZSAbpmqn0+yjdNFsc5guDSL4pB yQUNC+K4ouWatXruXhewIDcX2qKx833jCSfk162U87Km3/mGEtu0zF9uaNARcC3YyQqc GHWv+rfd57Qf1mDvjVfTWs0IUZZO+nEeEVOqIakqe880753TEsXPlowtiCnzTJIRKRIN yGvCcT9qtvrlQfwF0v15uA2k1cPA+hYXL/d5lQs03htQ8w+3RA+b+R6yfVS4vTNFTsPC J4yg== 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=dbElsHfI9FiCGYMopDy9JUfpf6k+IONRCYc0n0ZtrWA=; b=KvS2VCJwncRiVAEF11VC2VR9o5Iyz/gtIlTAGNJ74UvZxAIkANq0VxguJ2ZHXzZ+PM YurtI+DYMut/g0FMJTk0976uq/1kw/qb3iFxy0Dyfbbbvq4Z6WPwzK4r8loDHSGX1fUY c94pFit19cZ6Uh5sr7YqWDOaurP03ZKXlxJPQYqvWxyMGFGOiiU5ttwfCo8ZEnFAhu2z zedwn0Jkzoler8cWKKdSnKPZREcGQ9enSL1xmypSbUcIHX05Z9s4hLgukWGwcqihJdnB oMS3JAUNUIZDtV78mzku6MYs1zwjdQfRlzm7UT2x8veli9FmaHJl/YsHxlwBdtPznvsC m/XA== X-Gm-Message-State: AOAM530VkCFNyHs8HGjwWw4W1WTcvi5OcY4U1t5MhO6fFDTW6cY7gusk gPw5ct2St/57RYzXqrvsVqU= X-Google-Smtp-Source: ABdhPJzrItRfPJkLeW/1fi5l1p4tXzhQigxb1aiRSDd23CDcF6k2V8cYpG4tvuBLUqTNN66a2kN0Dw== X-Received: by 2002:a7b:cc1a:: with SMTP id f26mr9915956wmh.19.1613999273965; Mon, 22 Feb 2021 05:07:53 -0800 (PST) Received: from valhalla.home ([2.31.224.123]) by smtp.gmail.com with ESMTPSA id t198sm26575828wmt.7.2021.02.22.05.07.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 22 Feb 2021 05:07:53 -0800 (PST) From: Daniel Scally To: tfiga@chromium.org, sakari.ailus@linux.intel.com, rajmohan.mani@intel.com, rjw@rjwysocki.net, lenb@kernel.org, mika.westerberg@linux.intel.com, linus.walleij@linaro.org, bgolaszewski@baylibre.com, wsa@kernel.org, lee.jones@linaro.org Cc: andy.shevchenko@linux.intel.com, kieran.bingham+renesas@ideasonboard.com, laurent.pinchart@ideasonboard.com, hdegoede@redhat.com, mgross@linux.intel.com, luzmaximilian@gmail.com, robert.moore@intel.com, erik.kaneda@intel.com, me@fabwu.ch, 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 Subject: [PATCH v3 4/6] gpiolib: acpi: Export acpi_get_gpiod() Date: Mon, 22 Feb 2021 13:07:33 +0000 Message-Id: <20210222130735.1313443-5-djrscally@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210222130735.1313443-1-djrscally@gmail.com> References: <20210222130735.1313443-1-djrscally@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org I 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: this 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. Signed-off-by: Daniel Scally --- Changes in v3: - Having realised that it wasn't taking a reference to the GPIO device, I decided the best thing to do was leave the existing function as-is (apart from renaming) and provide a wrapper that simply passes through to the original and takes a reference before returning the struct gpio_desc Because of the change to that functionality, I dropped the R-b's from the last version. drivers/gpio/gpiolib-acpi.c | 36 +++++++++++++++++++++++++++++++---- include/linux/gpio/consumer.h | 7 +++++++ 2 files changed, 39 insertions(+), 4 deletions(-) diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c index e4d728fda982..0cc7cc327757 100644 --- a/drivers/gpio/gpiolib-acpi.c +++ b/drivers/gpio/gpiolib-acpi.c @@ -102,7 +102,8 @@ static int acpi_gpiochip_find(struct gpio_chip *gc, void *data) } /** - * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API + * __acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with + * GPIO API * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1") * @pin: ACPI GPIO pin number (0-based, controller-relative) * @@ -111,7 +112,7 @@ static int acpi_gpiochip_find(struct gpio_chip *gc, void *data) * controller does not have GPIO chip registered at the moment. This is to * support probe deferral. */ -static struct gpio_desc *acpi_get_gpiod(char *path, int pin) +static struct gpio_desc *__acpi_get_gpiod(char *path, int pin) { struct gpio_chip *chip; acpi_handle handle; @@ -128,6 +129,33 @@ static struct gpio_desc *acpi_get_gpiod(char *path, int pin) return gpiochip_get_desc(chip, pin); } +/** + * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with + * GPIO API, 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_gpiod(char *path, int pin, char *label) +{ + struct gpio_desc *gpio = __acpi_get_gpiod(path, pin); + int ret; + + if (IS_ERR(gpio)) + return gpio; + + ret = gpiod_request(gpio, label); + if (ret) + return ERR_PTR(ret); + + return gpio; +} +EXPORT_SYMBOL_GPL(acpi_get_gpiod); + static irqreturn_t acpi_gpio_irq_handler(int irq, void *data) { struct acpi_gpio_event *event = data; @@ -689,8 +717,8 @@ static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data) if (pin_index >= agpio->pin_table_length) return 1; - lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr, - agpio->pin_table[pin_index]); + lookup->desc = __acpi_get_gpiod(agpio->resource_source.string_ptr, + agpio->pin_table[pin_index]); lookup->info.pin_config = agpio->pin_config; lookup->info.debounce = agpio->debounce_timeout; lookup->info.gpioint = gpioint; diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h index ef49307611d2..6eee751f44dd 100644 --- a/include/linux/gpio/consumer.h +++ b/include/linux/gpio/consumer.h @@ -690,6 +690,8 @@ 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_gpiod(char *path, int pin, char *label); + #else /* CONFIG_GPIOLIB && CONFIG_ACPI */ struct acpi_device; @@ -708,6 +710,11 @@ static inline int devm_acpi_dev_add_driver_gpios(struct device *dev, } static inline void devm_acpi_dev_remove_driver_gpios(struct device *dev) {} +struct gpio_desc *acpi_get_gpiod(char *path, int pin, char *label) +{ + return NULL; +} + #endif /* CONFIG_GPIOLIB && CONFIG_ACPI */