From patchwork Tue Sep 5 18:52:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 13374908 Received: from mail-wm1-f49.google.com (mail-wm1-f49.google.com [209.85.128.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F112DDDAF for ; Tue, 5 Sep 2023 18:53:38 +0000 (UTC) Received: by mail-wm1-f49.google.com with SMTP id 5b1f17b1804b1-4018af103bcso1013175e9.1 for ; Tue, 05 Sep 2023 11:53:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bgdev-pl.20230601.gappssmtp.com; s=20230601; t=1693940017; x=1694544817; darn=lists.linux.dev; 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=LktKQq4MWoQ/qKoiT9d7DgSnCPQ1kCPUYmKK3IZgeGM=; b=1JRALQ7xKeopXqVfclTrmaRVanui1a2+ZlwvD1Qyd03UgZzZLLlUO7CSaLt3J1dV6a 7Il4BiTFOSzFlEVE22hDxpnyD7AEVjNBnvnG0tOnnROuPcCkNeKRyf24EXMFvNkvA008 N9CX4xVb0p3CYHv12RH5qHcri/nEMjFMzoJRItSizwRDRAqFkLVeQU9fvMB71gA9uJQW +pgDNBJUYcuu/aD/VX8bNLDEbp2x7B+/VNlgXS+4A6N5ZjCg1+3lXywvGiSahax0mKbR 1QLheEuvpHBfHlM+umGd+aw3x8Ezmcd/tUlwp1yKFZLggGzwI5M1Buk5mZ2d2+/TcLGn QGSQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1693940017; x=1694544817; 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=LktKQq4MWoQ/qKoiT9d7DgSnCPQ1kCPUYmKK3IZgeGM=; b=BgfRDxofQd5VStvwMOlDGONJ35o1x9H05YVRNDlEf+SOIuWjvQ8o1mBXQvS+j0uIve DRNuPDmEhlhBOemSNlOYBqMp0T/BI9T/dZILzHiq6TncwktQp0bGZH65fyRqEcNYmN2i EAByApT3Lh3rWeYYePMo7yVXQFHrEGl9/lrXq3sQcqymeWqQLKFZQjFGMCltbKDi2xtG iNVQTGggT2Yk+6m/4ZejH2yj96R8ouHdbp+dUqSbJIT+uzyG5EV/4Sls/2BW1qfX/va7 pOONUxZ/JUJNfIThB4Uv41V1578kOJ0yf5DZ7xW3BbQrhXDceYV9oIwLv2KC2ZOpTVt+ bFXA== X-Gm-Message-State: AOJu0Yz04B3VS7rx94yHDEpIofnZ0vEMVN8wkFhXWstmNUVGrHF71R4c opAeEQxTxjmWx+nEIQgD3ORsjA== X-Google-Smtp-Source: AGHT+IEKE+XCvxCtmXJO+rvvHv5Ifn1+auM+4ZurnpxJ8t+aLjhMPMETigx/CB4V/gfiHQTOepYw2A== X-Received: by 2002:a05:600c:4b1f:b0:401:bcec:be3e with SMTP id i31-20020a05600c4b1f00b00401bcecbe3emr598796wmp.17.1693940017155; Tue, 05 Sep 2023 11:53:37 -0700 (PDT) Received: from brgl-uxlite.home ([2a01:cb1d:334:ac00:7a54:5dbc:6d09:48b7]) by smtp.gmail.com with ESMTPSA id 17-20020a05600c249100b003fbc30825fbsm17550010wms.39.2023.09.05.11.53.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Sep 2023 11:53:36 -0700 (PDT) From: Bartosz Golaszewski To: Aaro Koskinen , Janusz Krzysztofik , Tony Lindgren , Russell King , Mika Westerberg , Andy Shevchenko , Linus Walleij , Bartosz Golaszewski , Dipen Patel , Thierry Reding , Jonathan Hunter , Hans de Goede , Mark Gross Cc: linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, linux-acpi@vger.kernel.org, timestamp@lists.linux.dev, linux-tegra@vger.kernel.org, platform-driver-x86@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH 09/21] gpiolib: reluctantly provide gpio_device_get_chip() Date: Tue, 5 Sep 2023 20:52:57 +0200 Message-Id: <20230905185309.131295-10-brgl@bgdev.pl> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230905185309.131295-1-brgl@bgdev.pl> References: <20230905185309.131295-1-brgl@bgdev.pl> Precedence: bulk X-Mailing-List: timestamp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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 | 18 ++++++++++++++++++ include/linux/gpio/driver.h | 1 + 2 files changed, 19 insertions(+) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 9715bbc698e9..408f8a7753f9 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -246,6 +246,24 @@ int gpio_device_get_base(struct gpio_device *gdev) } EXPORT_SYMBOL_GPL(gpio_device_get_base); +/** + * gpio_device_get_chip() - Get the gpio_chip implementation of this GPIO device + * @gdev: GPIO device + * + * Until we can get rid of all non-driver users 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 47906bc56b3d..bb9ec741bfda 100644 --- a/include/linux/gpio/driver.h +++ b/include/linux/gpio/driver.h @@ -782,6 +782,7 @@ struct gpio_device *gpiod_to_device(struct gpio_desc *desc); /* struct gpio_device getters */ int gpio_device_get_base(struct gpio_device *gdev); +struct gpio_chip *gpio_device_get_chip(struct gpio_device *gdev); #else /* CONFIG_GPIOLIB */