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Wysocki" , Stephen Boyd , Arnd Bergmann , Danilo Krummrich , Conor Dooley , Daire McNamara , Philipp Zabel , Douglas Anderson , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Hans de Goede , =?utf-8?q?Ilpo_J=C3=A4rvinen?= , Bryan O'Donoghue , Vladimir Kondratiev , Gregory CLEMENT , =?utf-8?q?Th=C3=A9o_Lebrun?= , Michael Turquette , Abel Vesa , Peng Fan , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Kevin Hilman , Martin Blumenstingl Cc: Jerome Brunet , linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, dri-devel@lists.freedesktop.org, platform-driver-x86@vger.kernel.org, linux-mips@vger.kernel.org, linux-clk@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org Subject: [PATCH v3 1/7] driver core: auxiliary bus: add device creation helpers Date: Tue, 11 Feb 2025 18:27:58 +0100 Message-ID: <20250211-aux-device-create-helper-v3-1-7edb50524909@baylibre.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20250211-aux-device-create-helper-v3-0-7edb50524909@baylibre.com> References: <20250211-aux-device-create-helper-v3-0-7edb50524909@baylibre.com> Precedence: bulk X-Mailing-List: imx@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=4290; i=jbrunet@baylibre.com; h=from:subject:message-id; bh=L2mc7++2m+KbwXPJfmeanEsMndjpINIhEyR+p/vnM+0=; b=owEBbQKS/ZANAwAKAeb8Dxw38tqFAcsmYgBnq4g2Jb64zhGo4nYo4f11I5GNQZEAzlSZ9Yo5d ngkcisRo/6JAjMEAAEKAB0WIQT04VmuGPP1bV8btxvm/A8cN/LahQUCZ6uINgAKCRDm/A8cN/La hf93D/9ySJRRpTfhwXJWNiKfMhcJCrBwzYVVixaTTNiJUGMkApqchMSmB0zNWhrawPaDlId3Qiv auxx3nD/C8QUQGOe3pmyimoKTtJX68sya3tWzYS13H4Sa0H9qFl2RM0zYZ2KeIfFaB5bXjAyZbp 8AafPJDeusV3rANuFGpxeUk8OJf2I26NERiAMf4JIeYfEk+DdUX/qaaekow/K+zX0friJeeHzfS n3nNP0mPksNRZ70HmTScJgvfPOEIO1hH8exi8I+Ge5RadGPr4ZAvrdduyqDrUcI+eC7Vw/vJkNh sW2YMStxssdA3V4ydPTzpH9vn+vlpXW1isL2h2lNUHHsZ6qQneIycJfGJCCYP1GDRky2C6AtPib l71wFmbfhXQPTnOmW1byyhQNUf2DG0Kse6unCPxWmU2O+bBwnBvUp3XtMEU/LOPI0MGCpZctNwz teda+aTYeFlWq/IRpLHb256e0QTj8OwBd64Y8+cWTJlY3OJswpzqv3zklJ0nKa5VDXQDUjv8dE/ 3Z3LHSVu21jO5GhGjKjzeZeJVnbohnbeTurbB9m0HLLQkVNy1b6qdMD98Y9uIm1F0V6fv5ak8Ji vqYRsnbb3UUjcLUi7RMxyNaRwF7lp8opYquywNB5WMkoWzbD21tWKnQOr6ID3hMTihGNxCRzIyH O4UjCmzh9bo+k5A== X-Developer-Key: i=jbrunet@baylibre.com; a=openpgp; fpr=F29F26CF27BAE1A9719AE6BDC3C92AAF3E60AED9 Add helper functions to create a device on the auxiliary bus. This is meant for fairly simple usage of the auxiliary bus, to avoid having the same code repeated in the different drivers. Suggested-by: Stephen Boyd Cc: Arnd Bergmann Signed-off-by: Jerome Brunet --- drivers/base/auxiliary.c | 88 +++++++++++++++++++++++++++++++++++++++++++ include/linux/auxiliary_bus.h | 10 +++++ 2 files changed, 98 insertions(+) diff --git a/drivers/base/auxiliary.c b/drivers/base/auxiliary.c index afa4df4c5a3f371b91d8dd8c4325495d32ad1291..0f697c9c243dc9a50498a52362806db594345faf 100644 --- a/drivers/base/auxiliary.c +++ b/drivers/base/auxiliary.c @@ -385,6 +385,94 @@ void auxiliary_driver_unregister(struct auxiliary_driver *auxdrv) } EXPORT_SYMBOL_GPL(auxiliary_driver_unregister); +static void auxiliary_device_release(struct device *dev) +{ + struct auxiliary_device *auxdev = to_auxiliary_dev(dev); + + kfree(auxdev); +} + +static struct auxiliary_device *auxiliary_device_create(struct device *dev, + const char *modname, + const char *devname, + void *platform_data, + int id) +{ + struct auxiliary_device *auxdev; + int ret; + + auxdev = kzalloc(sizeof(*auxdev), GFP_KERNEL); + if (!auxdev) + return ERR_PTR(-ENOMEM); + + auxdev->id = id; + auxdev->name = devname; + auxdev->dev.parent = dev; + auxdev->dev.platform_data = platform_data; + auxdev->dev.release = auxiliary_device_release; + device_set_of_node_from_dev(&auxdev->dev, dev); + + ret = auxiliary_device_init(auxdev); + if (ret) { + kfree(auxdev); + return ERR_PTR(ret); + } + + ret = __auxiliary_device_add(auxdev, modname); + if (ret) { + /* + * NOTE: It may look odd but auxdev should not be freed + * here. auxiliary_device_uninit() calls device_put() + * which call the device release function, freeing auxdev. + */ + auxiliary_device_uninit(auxdev); + return ERR_PTR(ret); + } + + return auxdev; +} + +static void auxiliary_device_destroy(void *_auxdev) +{ + struct auxiliary_device *auxdev = _auxdev; + + auxiliary_device_delete(auxdev); + auxiliary_device_uninit(auxdev); +} + +/** + * __devm_auxiliary_device_create - create a device on the auxiliary bus + * @dev: parent device + * @modname: module name used to create the auxiliary driver name. + * @devname: auxiliary bus device name + * @platform_data: auxiliary bus device platform data + * @id: auxiliary bus device id + * + * Device managed helper to create an auxiliary bus device. + * The device create matches driver 'modname.devname' on the auxiliary bus. + */ +struct auxiliary_device *__devm_auxiliary_device_create(struct device *dev, + const char *modname, + const char *devname, + void *platform_data, + int id) +{ + struct auxiliary_device *auxdev; + int ret; + + auxdev = auxiliary_device_create(dev, modname, devname, platform_data, id); + if (IS_ERR(auxdev)) + return auxdev; + + ret = devm_add_action_or_reset(dev, auxiliary_device_destroy, + auxdev); + if (ret) + return ERR_PTR(ret); + + return auxdev; +} +EXPORT_SYMBOL_GPL(__devm_auxiliary_device_create); + void __init auxiliary_bus_init(void) { WARN_ON(bus_register(&auxiliary_bus_type)); diff --git a/include/linux/auxiliary_bus.h b/include/linux/auxiliary_bus.h index 65dd7f15437474468acf0e28f6932a7ff2cfff2c..c098568eeed2a518b055afbf1f1e68623a2c109a 100644 --- a/include/linux/auxiliary_bus.h +++ b/include/linux/auxiliary_bus.h @@ -254,6 +254,16 @@ int __auxiliary_driver_register(struct auxiliary_driver *auxdrv, struct module * void auxiliary_driver_unregister(struct auxiliary_driver *auxdrv); +struct auxiliary_device *__devm_auxiliary_device_create(struct device *dev, + const char *modname, + const char *devname, + void *platform_data, + int id); + +#define devm_auxiliary_device_create(dev, devname, platform_data, id) \ + __devm_auxiliary_device_create(dev, KBUILD_MODNAME, devname, \ + platform_data, id) + /** * module_auxiliary_driver() - Helper macro for registering an auxiliary driver * @__auxiliary_driver: auxiliary driver struct