On 23:16 Sun 03 Feb , Antony Pavlov wrote:
> Also import related functions gpio_request_one() and
> gpio_free_array().
>
> Signed-off-by: Antony Pavlov <antonynpavlov@xxxxxxxxx>
> ---
> drivers/gpio/gpio.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++
> include/gpio.h | 43 +++++++++++++++++++++++++++++++++
> 2 files changed, 109 insertions(+)
>
> diff --git a/drivers/gpio/gpio.c b/drivers/gpio/gpio.c
> index d37f5a0..631168d 100644
> --- a/drivers/gpio/gpio.c
> +++ b/drivers/gpio/gpio.c
> @@ -65,6 +65,72 @@ void gpio_free(unsigned gpio)
> free(gi->label);
> }
>
> +/**
> + * gpio_request_one - request a single GPIO with initial configuration
> + * @gpio: the GPIO number
> + * @flags: GPIO configuration as specified by GPIOF_*
> + * @label: a literal description string of this GPIO
> + */
> +int gpio_request_one(unsigned gpio, unsigned long flags, const char *label)
> +{
> + int err;
> +
> + err = gpio_request(gpio, label);
> + if (err)
> + return err;
> +
> + if (flags & GPIOF_DIR_IN)
> + err = gpio_direction_input(gpio);
> + else
> + err = gpio_direction_output(gpio,
> + (flags & GPIOF_INIT_HIGH) ? 1 : 0);
> +
> + if (err)
> + goto free_gpio;
> +
> + return 0;
> +
> +free_gpio:
> + gpio_free(gpio);
> + return err;
> +}
> +EXPORT_SYMBOL(gpio_request_one);
> +
> +/**
> + * gpio_request_array - request multiple GPIOs in a single call
> + * @array: array of the 'struct gpio'
> + * @num: how many GPIOs in the array
> + */
> +int gpio_request_array(const struct gpio *array, size_t num)
> +{
> + int i, err;
> +
> + for (i = 0; i < num; i++, array++) {
> + err = gpio_request_one(array->gpio, array->flags, array->label);
> + if (err)
> + goto err_free;
> + }
> + return 0;
> +
> +err_free:
> + while (i--)
> + gpio_free((--array)->gpio);
> + return err;
> +}
> +EXPORT_SYMBOL(gpio_request_array);
> +
> +/**
> + * gpio_free_array - release multiple GPIOs in a single call
> + * @array: array of the 'struct gpio'
> + * @num: how many GPIOs in the array
> + */
> +void gpio_free_array(const struct gpio *array, size_t num)
> +{
> + while (num--)
> + gpio_free((array++)->gpio);
> +}
> +EXPORT_SYMBOL(gpio_free_array);
> +
> void gpio_set_value(unsigned gpio, int value)
> {
> struct gpio_info *gi = &gpio_desc[gpio];
> diff --git a/include/gpio.h b/include/gpio.h
> index eedb980..37c151d 100644
> --- a/include/gpio.h
> +++ b/include/gpio.h
> @@ -3,6 +3,29 @@
>
> #include <asm/gpio.h>
>
> +/* make these flag values available regardless of GPIO kconfig options */
> +#define GPIOF_DIR_OUT (0 << 0)
> +#define GPIOF_DIR_IN (1 << 0)
> +
> +#define GPIOF_INIT_LOW (0 << 1)
> +#define GPIOF_INIT_HIGH (1 << 1)
> +
> +#define GPIOF_IN (GPIOF_DIR_IN)
> +#define GPIOF_OUT_INIT_LOW (GPIOF_DIR_OUT | GPIOF_INIT_LOW)
> +#define GPIOF_OUT_INIT_HIGH (GPIOF_DIR_OUT | GPIOF_INIT_HIGH)
> +
> +/**
> + * struct gpio - a structure describing a GPIO with configuration
> + * @gpio: the GPIO number
> + * @flags: GPIO configuration as specified by GPIOF_*
> + * @label: a literal description string of this GPIO
> + */
> +struct gpio {
> + unsigned gpio;
> + unsigned long flags;
> + const char *label;
> +};
> +
> #ifndef CONFIG_GPIOLIB
> static inline int gpio_request(unsigned gpio, const char *label)
> {
> @@ -12,9 +35,29 @@ static inline int gpio_request(unsigned gpio, const char *label)
> static inline void gpio_free(unsigned gpio)
> {
> }
> +
> +static inline int gpio_request_one(unsigned gpio,
> + unsigned long flags, const char *label)
> +{
> + return 0;
> +}
> +
> +static inline int gpio_request_array(const struct gpio *array, size_t num)
> +{
> + return 0;
> +}
you can not do this
as if we start to use this in generic driver where gpio_direction_input/output
work
we will endup with no configuration
so you need to provide working inline instead
> +
> +static inline void gpio_free_array(const struct gpio *array, size_t num)
> +{
> + /* GPIO can never have been requested */
> + WARN_ON(1);
> +}
> #else
> int gpio_request(unsigned gpio, const char *label);
> void gpio_free(unsigned gpio);
> +int gpio_request_one(unsigned gpio, unsigned long flags, const char *label);
> +int gpio_request_array(const struct gpio *array, size_t num);
> +void gpio_free_array(const struct gpio *array, size_t num);
> #endif
>
> struct gpio_chip;
> --
> 1.7.10.4
>
>
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