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gpiolib: reluctantly provide gpio_device_get_chip()

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The process of converting all unauthorized users of struct gpio_chip to
using dedicated struct gpio_device function will be long so in the
meantime we must provide a way of retrieving the pointer to struct
gpio_chip from a GPIO device.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Bartosz Golaszewski 2023-09-27 16:29:26 +02:00
parent 93548f8bbb
commit 9b41878084
2 changed files with 23 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);
/**
* gpio_device_get_chip() - Get the gpio_chip implementation of this GPIO device
* @gdev: GPIO device
*
* Returns:
* Address of the GPIO chip backing this device.
*
* Until we can get rid of all non-driver users of struct gpio_chip, we must
* provide a way of retrieving the pointer to it from struct gpio_device. This
* is *NOT* safe as the GPIO API is considered to be hot-unpluggable and the
* chip can dissapear at any moment (unlike reference-counted struct
* gpio_device).
*
* Use at your own risk.
*/
struct gpio_chip *gpio_device_get_chip(struct gpio_device *gdev)
{
return gdev->chip;
}
EXPORT_SYMBOL_GPL(gpio_device_get_chip);
/* dynamic allocation of GPIOs, e.g. on a hotplugged device */
static int gpiochip_find_base(int ngpio)
{

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

@ -773,6 +773,8 @@ struct gpio_desc *gpiochip_get_desc(struct gpio_chip *gc, unsigned int hwnum);
struct gpio_desc *
gpio_device_get_desc(struct gpio_device *gdev, unsigned int hwnum);
struct gpio_chip *gpio_device_get_chip(struct gpio_device *gdev);
#ifdef CONFIG_GPIOLIB
/* lock/unlock as IRQ */