Re: [PATCH 1/3] gpiolib: make gpio_to_chip() public

Laurent Pinchart
2008-08-14T14:04:43Z

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On Friday 08 August 2008, Anton Vorontsov wrote:
> We'll need this function to write platform-specific hooks to deal
> with pin's dedicated functions. Quite obviously this will work only
> for the platforms with 1-to-1 GPIO to PIN mapping.
>
> This is stopgap solution till we think out and implement a proper
> api (pinlib?).

How do you support reverting the GPIO mode to non-dedicated ?

> Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
> ---
> drivers/gpio/gpiolib.c | 3 ++-
> include/asm-generic/gpio.h | 1 +
> 2 files changed, 3 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index 8d29405..9536fa8 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -81,10 +81,11 @@ static void gpio_ensure_requested(struct gpio_desc *desc)
> }
>
> /* caller holds gpio_lock *OR* gpio is marked as requested */
> -static inline struct gpio_chip *gpio_to_chip(unsigned gpio)
> +struct gpio_chip *gpio_to_chip(unsigned gpio)
> {
> return gpio_desc[gpio].chip;
> }
> +EXPORT_SYMBOL_GPL(gpio_to_chip);
>
> /* dynamic allocation of GPIOs, e.g. on a hotplugged device */
> static int gpiochip_find_base(int ngpio)
> diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
> index 0f99ad3..d70ee45 100644
> --- a/include/asm-generic/gpio.h
> +++ b/include/asm-generic/gpio.h
> @@ -81,6 +81,7 @@ struct gpio_chip {
> unsigned exported:1;
> };
>
> +extern struct gpio_chip *gpio_to_chip(unsigned gpio);
> extern const char *gpiochip_is_requested(struct gpio_chip *chip,
> unsigned offset);
> extern int __must_check gpiochip_reserve(int start, int ngpio);

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Laurent Pinchart
CSE Semaphore Belgium

Chaussee de Bruxelles, 732A
B-1410 Waterloo
Belgium

T +32 (2) 387 42 59
F +32 (2) 387 42 75

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