From 370232d096e3fe188e4596f77bc6560636bd40c1 Mon Sep 17 00:00:00 2001 From: Bartosz Golaszewski Date: Wed, 11 Oct 2023 15:02:03 +0200 Subject: gpiolib: provide gpiod_to_gpio_device() Accessing struct gpio_chip backing a GPIO device is only allowed for the actual providers of that chip. Similarly to how we introduced gpio_device_find() in order to replace the abused gpiochip_find(), let's introduce a counterpart to gpiod_to_chip() that returns a reference to the GPIO device owning the descriptor. This is done in order to later remove gpiod_to_chip() entirely. Signed-off-by: Bartosz Golaszewski Reviewed-by: Peter Rosin Acked-by: Linus Walleij --- drivers/gpio/gpiolib.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'drivers') diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 7e297ae35f8c..9febaef6767d 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); +/** + * gpiod_to_gpio_device() - Return the GPIO device to which this descriptor + * belongs. + * @desc: Descriptor for which to return the GPIO device. + * + * This *DOES NOT* increase the reference count of the GPIO device as it's + * expected that the descriptor is requested and the users already holds a + * reference to the device. + * + * Returns: + * Address of the GPIO device owning this descriptor. + */ +struct gpio_device *gpiod_to_gpio_device(struct gpio_desc *desc) +{ + if (!desc) + return NULL; + + return desc->gdev; +} +EXPORT_SYMBOL_GPL(gpiod_to_gpio_device); + /** * gpio_device_get_chip() - Get the gpio_chip implementation of this GPIO device * @gdev: GPIO device -- cgit v1.2.3