diff options
| author | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2023-09-27 16:29:26 +0200 |
|---|---|---|
| committer | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2023-10-04 13:30:15 +0200 |
| commit | 9b418780844c677669ab474f6f29940ef545c954 (patch) | |
| tree | f00a90b3e9c4f344024bafc51bf8559896506225 | |
| parent | 93548f8bbbbf5b62dbd37c8f61a037a06666787b (diff) | |
gpiolib: reluctantly provide gpio_device_get_chip()
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>
| -rw-r--r-- | drivers/gpio/gpiolib.c | 21 | ||||
| -rw-r--r-- | include/linux/gpio/driver.h | 2 |
2 files changed, 23 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index f4fdf620ca74..6bb8d4a0b1d4 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -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) { diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h index 3fdf3f14bb13..f8ad7f40100c 100644 --- a/include/linux/gpio/driver.h +++ b/include/linux/gpio/driver.h @@ -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 */ |