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gpiolib: provide gpio_device_get_base()

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Let's start adding getters for the opaque struct gpio_device. Start with
a function allowing to retrieve the base GPIO number.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Bartosz Golaszewski 2023-09-05 20:52:55 +02:00
parent 9acdf6209f
commit 8c85a102fc
2 changed files with 16 additions and 0 deletions
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13
drivers/gpio/gpiolib.c
View File

@ -241,6 +241,19 @@ struct gpio_device *gpiod_to_gpio_device(struct gpio_desc *desc)
} }
EXPORT_SYMBOL_GPL(gpiod_to_gpio_device); EXPORT_SYMBOL_GPL(gpiod_to_gpio_device);
/**
* gpio_device_get_base() - Get the base GPIO number allocated by this device
* @gdev: GPIO device
*
* Returns:
* First GPIO number in the global GPIO numberspace for this device.
*/
int gpio_device_get_base(struct gpio_device *gdev)
{
return gdev->base;
}
EXPORT_SYMBOL_GPL(gpio_device_get_base);
/** /**
* gpio_device_get_chip() - Get the gpio_chip implementation of this GPIO device * gpio_device_get_chip() - Get the gpio_chip implementation of this GPIO device
* @gdev: GPIO device * @gdev: GPIO device

3
include/linux/gpio/driver.h
View File

@ -787,6 +787,9 @@ 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_chip *gpiod_to_chip(const struct gpio_desc *desc);
struct gpio_device *gpiod_to_gpio_device(struct gpio_desc *desc); struct gpio_device *gpiod_to_gpio_device(struct gpio_desc *desc);
/* struct gpio_device getters */
int gpio_device_get_base(struct gpio_device *gdev);
#else /* CONFIG_GPIOLIB */ #else /* CONFIG_GPIOLIB */
#include <linux/err.h> #include <linux/err.h>