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SubjectRE: [PATCH 1/2] gpio: expose gpio_to_chip()
On Friday, June 10, 2011 1:49 AM, Linus Walleij wrote:
>
> This makes the gpio_to_chip() function available to drivers. The
> usecase is when you want to add a few chip-specific operations
> apart from the ones exposed in struct gpio_chip.
>
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
> ---
> drivers/gpio/gpiolib.c | 2 +-
> include/asm-generic/gpio.h | 1 +
> 2 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index a971e3d..dc315e9 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -114,7 +114,7 @@ static int gpio_ensure_requested(struct gpio_desc *desc, unsigned offset)
> }
>
> /* 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;
> }
> diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
> index fcdcb5d..dd8c815 100644
> --- a/include/asm-generic/gpio.h
> +++ b/include/asm-generic/gpio.h
> @@ -132,6 +132,7 @@ struct gpio_chip {
> #endif
> };
>
> +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);

Linus,

You'll need to fix a couple drivers for this to work. The symbol gpio_to_chip
is a static symbol in a couple places other than gpiolib.c.


arch/arm/plat-pxa/gpio.c:static inline struct pxa_gpio_chip *gpio_to_chip(unsigned gpio)
drivers/gpio/gpio-74x164.c:static struct gen_74x164_chip *gpio_to_chip(struct gpio_chip *gc)

Regards,
Hartley


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