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gpiolib: provide gpio_device_to_device()

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There are users in the kernel who need to retrieve the address of the
struct device backing the GPIO device. Currently they needlessly poke in
the internals of GPIOLIB. Add a dedicated getter function.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Peter Rosin <peda@axentia.se>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Bartosz Golaszewski 2023-10-11 15:02:02 +02:00
parent 4f3b436eea
commit 1559d14977
2 changed files with 19 additions and 0 deletions
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17
drivers/gpio/gpiolib.c
View File

@ -1189,6 +1189,23 @@ void gpio_device_put(struct gpio_device *gdev)
}
EXPORT_SYMBOL_GPL(gpio_device_put);
/**
* gpio_device_to_device() - Retrieve the address of the underlying struct
* device.
* @gdev: GPIO device for which to return the address.
*
* This does not increase the reference count of the GPIO device nor the
* underlying struct device.
*
* Returns:
* Address of struct device backing this GPIO device.
*/
struct device *gpio_device_to_device(struct gpio_device *gdev)
{
return &gdev->dev;
}
EXPORT_SYMBOL_GPL(gpio_device_to_device);
#ifdef CONFIG_GPIOLIB_IRQCHIP
/*

2
include/linux/gpio/driver.h
View File

@ -619,6 +619,8 @@ void gpio_device_put(struct gpio_device *gdev);
DEFINE_FREE(gpio_device_put, struct gpio_device *,
if (IS_ERR_OR_NULL(_T)) gpio_device_put(_T));
struct device *gpio_device_to_device(struct gpio_device *gdev);
bool gpiochip_line_is_irq(struct gpio_chip *gc, unsigned int offset);
int gpiochip_reqres_irq(struct gpio_chip *gc, unsigned int offset);
void gpiochip_relres_irq(struct gpio_chip *gc, unsigned int offset);