From patchwork Thu Jun 3 22:40:04 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Scally X-Patchwork-Id: 454368 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 C6315C47242 for ; Thu, 3 Jun 2021 22:41:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AA612613D8 for ; Thu, 3 Jun 2021 22:41:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229981AbhFCWn0 (ORCPT ); Thu, 3 Jun 2021 18:43:26 -0400 Received: from mail-wr1-f43.google.com ([209.85.221.43]:42708 "EHLO mail-wr1-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229961AbhFCWn0 (ORCPT ); Thu, 3 Jun 2021 18:43:26 -0400 Received: by mail-wr1-f43.google.com with SMTP id c5so7337648wrq.9; Thu, 03 Jun 2021 15:41:24 -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=Kmp6dSBMRLiq8EO1sTf6qChRpauTe2dmrjHETj38s2U=; b=Q1tjpkAdYyR3Hk2RMnBthVZMhmaIQZ4b0k87Z3jNPTj+44FOAZRytw2yyZpmFnWlaW cXp610ctBOV7CBq/ueEGdhM01CbNo3SARSU/8VnnJwheRDRpQn8dnJ0UEzVOKLcSKuqe TiU/Q6G6YO9XGRZ0PSlqCmARuFzCE/sbI/vTUwRyVRvbc/6IH+MISv39zHItESdH+ZDG 9ToXHQB8vQi1V9XQ/9NYFXA9zPvV+zhdq3NiEaE7yMItpS7Fv8hbcwkXeGuW//MrOdWr V7OcP9dQat4tTLOtEMT+KLclIWTizuLx/h274rT7iKIralGYKdY1tu0FVzAEP/6zQpof wqmA== 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=Kmp6dSBMRLiq8EO1sTf6qChRpauTe2dmrjHETj38s2U=; b=IrCg4ViJc6WJ57RwOXbYoeGMLDhH/ihxbzR7mh+hxtAIvQ71HbpdsnfvX39Nb39eHS Qhn++earBwM1pLv5TXwKw77Zcnr3qTYNqiL14X9ctvUWZpHB0JYpjp/GTsvP6vwvBQFJ Nx+B3PgmadYqVO66IsFuHO+Ac8U123WJhF2ehBDIcH2qIgBo2rNtLPbICDwCtXT56eI1 dMnlTFx3HEjOwUpCiJCETnKwSRZu8n6Djj7zg6Fmm0Ker5vDSTk7d+ZvzirOZxWCo6yW tNHO8nbilDr3s0aj0YXzyx4JWKOmKKcSisWoaZqlX17c0bJmvCdVb5RZWbWm7CYha0u8 Xfiw== X-Gm-Message-State: AOAM531DgyVHkU/RSki4X91XRhmSEut0ebPsRto15eFhzqPdYVY/Ot4c k3ZblyweEQO8t+eBE89JNt8= X-Google-Smtp-Source: ABdhPJyoBD+gzNGPlwurXFCGJJQgxkpRtARpcMsaH2I3nIg+SviaNB4pCapmAZM/YGd+mHUMvU/FPA== X-Received: by 2002:a5d:664c:: with SMTP id f12mr659229wrw.206.1622760023745; Thu, 03 Jun 2021 15:40:23 -0700 (PDT) Received: from valhalla.home ([91.110.88.218]) by smtp.gmail.com with ESMTPSA id f14sm4612103wry.40.2021.06.03.15.40.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 03 Jun 2021 15:40:23 -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 3/6] gpiolib: acpi: Export acpi_get_gpiod() Date: Thu, 3 Jun 2021 23:40:04 +0100 Message-Id: <20210603224007.120560-4-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 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 v4: - None 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;