Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
+22
+21
drivers/gpio/gpiolib.c
+21
drivers/gpio/gpiolib.c
···
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EXPORT_SYMBOL_GPL(gpiod_to_chip);
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/**
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* gpiod_to_gpio_device() - Return the GPIO device to which this descriptor
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* belongs.
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* @desc: Descriptor for which to return the GPIO device.
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*
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* This *DOES NOT* increase the reference count of the GPIO device as it's
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* expected that the descriptor is requested and the users already holds a
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* reference to the device.
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*
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* Returns:
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* Address of the GPIO device owning this descriptor.
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*/
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struct gpio_device *gpiod_to_gpio_device(struct gpio_desc *desc)
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{
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if (!desc)
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return NULL;
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return desc->gdev;
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}
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EXPORT_SYMBOL_GPL(gpiod_to_gpio_device);
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/**
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* gpio_device_get_chip() - Get the gpio_chip implementation of this GPIO device
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* @gdev: GPIO device
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*
+1
include/linux/gpio/driver.h
+1
include/linux/gpio/driver.h