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| author |   Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2023-09-27 16:29:23 +0200 |
|---|---|---|
| committer | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2023-10-04 13:29:31 +0200 |
| commit | cfe102f63308c8c8e01199a682868a64b83f653e (patch) | |
| tree | bfdbc2a94b76a3c9a971d4b2c514d153ceafaba2 /include/linux/gpio | |
| parent | gpiolib: add support for scope-based management to gpio_device (diff) | |
| download | wireguard-linux-cfe102f63308c8c8e01199a682868a64b83f653e.tar.xz wireguard-linux-cfe102f63308c8c8e01199a682868a64b83f653e.zip | |
gpiolib: provide gpio_device_find()
gpiochip_find() is wrong and its kernel doc is misleading as the
function doesn't return a reference to the gpio_chip but just a raw
pointer. The chip itself is not guaranteed to stay alive, in fact it can
be deleted at any point. Also: other than GPIO drivers themselves,
nobody else has any business accessing gpio_chip structs.
Provide a new gpio_device_find() function that returns a real reference
to the opaque gpio_device structure that is guaranteed to stay alive for
as long as there are active users of it.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'include/linux/gpio')
| -rw-r--r-- | include/linux/gpio/driver.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h index 1cedbc3d3200..6ad1f1a8ef2e 100644 --- a/include/linux/gpio/driver.h +++ b/include/linux/gpio/driver.h @@ -608,6 +608,9 @@ int devm_gpiochip_add_data_with_key(struct device *dev, struct gpio_chip *gc, struct gpio_chip *gpiochip_find(void *data, int (*match)(struct gpio_chip *gc, void *data)); +struct gpio_device *gpio_device_find(void *data, + int (*match)(struct gpio_chip *gc, void *data)); + struct gpio_device *gpio_device_get(struct gpio_device *gdev); void gpio_device_put(struct gpio_device *gdev); |