diff options
| author |   Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2023-10-11 15:02:03 +0200 |
|---|---|---|
| committer | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2023-10-13 08:50:04 +0200 |
| commit | 370232d096e3fe188e4596f77bc6560636bd40c1 (patch) | |
| tree | f4897b29c370cde5171981b11bb11aa571a2283c | |
| parent | gpiolib: provide gpio_device_to_device() (diff) | |
| download | wireguard-linux-370232d096e3fe188e4596f77bc6560636bd40c1.tar.xz wireguard-linux-370232d096e3fe188e4596f77bc6560636bd40c1.zip | |
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 <bartosz.golaszewski@linaro.org>
Reviewed-by: Peter Rosin <peda@axentia.se>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
| -rw-r--r-- | drivers/gpio/gpiolib.c | 21 | ||||
| -rw-r--r-- | include/linux/gpio/driver.h | 1 |
2 files changed, 22 insertions, 0 deletions
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 @@ -221,6 +221,27 @@ 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 * diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h index 0e40098aa283..d231c4f31cb4 100644 --- a/include/linux/gpio/driver.h +++ b/include/linux/gpio/driver.h @@ -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 */ |