91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
#ifndef __GPIO_H
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#define __GPIO_H
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#include <asm/gpio.h>
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#define GPIOF_DIR_OUT (0 << 0)
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#define GPIOF_DIR_IN (1 << 0)
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#define GPIOF_INIT_LOW (0 << 1)
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#define GPIOF_INIT_HIGH (1 << 1)
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#define GPIOF_IN (GPIOF_DIR_IN)
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#define GPIOF_OUT_INIT_LOW (GPIOF_DIR_OUT | GPIOF_INIT_LOW)
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#define GPIOF_OUT_INIT_HIGH (GPIOF_DIR_OUT | GPIOF_INIT_HIGH)
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/**
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* struct gpio - a structure describing a GPIO with configuration
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* @gpio: the GPIO number
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* @flags: GPIO configuration as specified by GPIOF_*
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* @label: a literal description string of this GPIO
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*/
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struct gpio {
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unsigned gpio;
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unsigned long flags;
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const char *label;
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};
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#ifndef CONFIG_GPIOLIB
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static inline int gpio_request(unsigned gpio, const char *label)
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{
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return 0;
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}
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static inline void gpio_free(unsigned gpio)
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{
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}
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static inline int gpio_request_one(unsigned gpio,
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unsigned long flags, const char *label)
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{
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return -ENOSYS;
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}
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static inline int gpio_request_array(const struct gpio *array, size_t num)
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{
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return -ENOSYS;
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}
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static inline void gpio_free_array(const struct gpio *array, size_t num)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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}
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#else
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int gpio_request(unsigned gpio, const char *label);
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void gpio_free(unsigned gpio);
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int gpio_request_one(unsigned gpio, unsigned long flags, const char *label);
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int gpio_request_array(const struct gpio *array, size_t num);
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void gpio_free_array(const struct gpio *array, size_t num);
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#endif
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struct gpio_chip;
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struct gpio_ops {
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int (*request)(struct gpio_chip *chip, unsigned offset);
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void (*free)(struct gpio_chip *chip, unsigned offset);
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int (*direction_input)(struct gpio_chip *chip, unsigned offset);
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int (*direction_output)(struct gpio_chip *chip, unsigned offset, int value);
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int (*get_direction)(struct gpio_chip *chip, unsigned offset);
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int (*get)(struct gpio_chip *chip, unsigned offset);
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void (*set)(struct gpio_chip *chip, unsigned offset, int value);
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};
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struct gpio_chip {
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struct device_d *dev;
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int base;
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int ngpio;
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struct gpio_ops *ops;
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struct list_head list;
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};
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int gpiochip_add(struct gpio_chip *chip);
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void gpiochip_remove(struct gpio_chip *chip);
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int gpio_get_num(struct device_d *dev, int gpio);
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#endif /* __GPIO_H */
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