From patchwork Fri Sep 15 15:03:21 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 723762 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2D7D3EED603 for ; Fri, 15 Sep 2023 15:03:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235864AbjIOPDw (ORCPT ); Fri, 15 Sep 2023 11:03:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48830 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235858AbjIOPDo (ORCPT ); Fri, 15 Sep 2023 11:03:44 -0400 Received: from mail-wm1-x334.google.com (mail-wm1-x334.google.com [IPv6:2a00:1450:4864:20::334]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AE0072719 for ; Fri, 15 Sep 2023 08:03:38 -0700 (PDT) Received: by mail-wm1-x334.google.com with SMTP id 5b1f17b1804b1-403012f276dso24530575e9.0 for ; Fri, 15 Sep 2023 08:03:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bgdev-pl.20230601.gappssmtp.com; s=20230601; t=1694790217; x=1695395017; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=f7cnFQaXE5hgNGVsFuhD31Dbn34C6HVkTSPK79EhhMo=; b=Ev5euDCkEcMyo0Vi4HTUYVTfW9nuMoInIT+a1zskafF66mHsZ0IliYQHDC/CbYvCHv SgIa37TovU2rkGI02FnKLad5qhkl8OUkK1AQL6Gr2/1zsSjyQINW+r/yaRKMaaNQUdk1 NCCvfu2U2YdQXT4+QqX0uoRFEdcUqYaiKB9RyXDP670KYo5hA7GLgXZBzYKPCCULqkQX aGgzxcPj92fuZphAJyL5lRwpzkka1yEGmCVay1cjte1PCM561o74LNYhJkpsBE985je+ wEeGy24lDjysXDfmGJ36yYCVi3VTTgtMi1Exb27xcTYDNbNi14i74owlbvYPX9UwIptD aP6Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1694790217; x=1695395017; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=f7cnFQaXE5hgNGVsFuhD31Dbn34C6HVkTSPK79EhhMo=; b=jheJZMDv9UZMhdm2yC2UbpDAFRb0hieBCNwSVFVum2mG2DDnU4Oty4vswT5GHRBLHK ESmWYhQJd8FEnoChK3783MKmGalDLi0tQn/aagg2fzPYUQAInQhGHKv8XnfGj5n6sz+K DWe0qfIvtVuIdXCij7VbDspo6hFe2yRxOpvlo2ZgnRhEP/Lz6sxWzASR1xUGpuU5F6T5 xCetxJptT6Ex0VcPUrwkaEQQG3qzMxrS1mHCAW3wHwns141pmic/pjsQ4l5hCIdBg2fr NA+htI39BP6iXTG+jkAC0GPfWJPpQGop99WJZPvyLKRzg8i0ogdCwkZS7SkLqPjEjDxa bJPA== X-Gm-Message-State: AOJu0YxIwpW4lw1nhAqVRH37brxCd/AM/HUOGOVMKIeAvjriBccOS6KD NW2K97eM9kASQRqquuzRvlZD+w== X-Google-Smtp-Source: AGHT+IEorh4sO+fT8YcWE2co/gViak4l34nxlE1iLrbUtDPxiVwO0HapW2pbE+TLh0BrG3WzweMY4g== X-Received: by 2002:a05:600c:203:b0:3fe:3004:1ffd with SMTP id 3-20020a05600c020300b003fe30041ffdmr1735651wmi.4.1694790216912; Fri, 15 Sep 2023 08:03:36 -0700 (PDT) Received: from brgl-uxlite.home ([2a01:cb1d:334:ac00:aa19:4569:aeeb:c0d3]) by smtp.gmail.com with ESMTPSA id hn40-20020a05600ca3a800b003fef19bb55csm4853369wmb.34.2023.09.15.08.03.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Sep 2023 08:03:36 -0700 (PDT) From: Bartosz Golaszewski To: Linus Walleij , Andy Shevchenko , Mika Westerberg Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v3 06/11] gpiolib: reluctantly provide gpio_device_get_chip() Date: Fri, 15 Sep 2023 17:03:21 +0200 Message-Id: <20230915150327.81918-7-brgl@bgdev.pl> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230915150327.81918-1-brgl@bgdev.pl> References: <20230915150327.81918-1-brgl@bgdev.pl> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org From: Bartosz Golaszewski The process of converting all unauthorized users of struct gpio_chip to using dedicated struct gpio_device function will be long so in the meantime we must provide a way of retrieving the pointer to struct gpio_chip from a GPIO device. Signed-off-by: Bartosz Golaszewski Reviewed-by: Linus Walleij --- drivers/gpio/gpiolib.c | 21 +++++++++++++++++++++ include/linux/gpio/driver.h | 2 ++ 2 files changed, 23 insertions(+) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 7d2574b3dbe5..e26cbd10a246 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -220,6 +220,27 @@ struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc) } EXPORT_SYMBOL_GPL(gpiod_to_chip); +/** + * gpio_device_get_chip() - Get the gpio_chip implementation of this GPIO device + * @gdev: GPIO device + * + * Returns: + * Address of the GPIO chip backing this device. + * + * Until we can get rid of all non-driver users of struct gpio_chip, we must + * provide a way of retrieving the pointer to it from struct gpio_device. This + * is *NOT* safe as the GPIO API is considered to be hot-unpluggable and the + * chip can dissapear at any moment (unlike reference-counted struct + * gpio_device). + * + * Use at your own risk. + */ +struct gpio_chip *gpio_device_get_chip(struct gpio_device *gdev) +{ + return gdev->chip; +} +EXPORT_SYMBOL_GPL(gpio_device_get_chip); + /* dynamic allocation of GPIOs, e.g. on a hotplugged device */ static int gpiochip_find_base(int ngpio) { diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h index 3fdf3f14bb13..f8ad7f40100c 100644 --- a/include/linux/gpio/driver.h +++ b/include/linux/gpio/driver.h @@ -773,6 +773,8 @@ struct gpio_desc *gpiochip_get_desc(struct gpio_chip *gc, unsigned int hwnum); struct gpio_desc * gpio_device_get_desc(struct gpio_device *gdev, unsigned int hwnum); +struct gpio_chip *gpio_device_get_chip(struct gpio_device *gdev); + #ifdef CONFIG_GPIOLIB /* lock/unlock as IRQ */