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gpiolib: provide gpiod_to_gpio_device()

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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 <bartosz.golaszewski@linaro.org>
Reviewed-by: Peter Rosin <peda@axentia.se>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Bartosz Golaszewski 2023-10-11 15:02:03 +02:00
parent 1559d14977
commit 370232d096
2 changed files with 22 additions and 0 deletions
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21
drivers/gpio/gpiolib.c
View File

@ -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

1
include/linux/gpio/driver.h
View File

@ -785,6 +785,7 @@ int gpiochip_lock_as_irq(struct gpio_chip *gc, unsigned int offset);
void gpiochip_unlock_as_irq(struct gpio_chip *gc, unsigned int offset);
struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc);
struct gpio_device *gpiod_to_gpio_device(struct gpio_desc *desc);
#else /* CONFIG_GPIOLIB */