bcf0877266
Also import related functions gpio_request_one() and
gpio_free_array().
This commit imports code from linux 3.7 as
the more recent linux kernel versions use gpiolib descriptors,
see this commit for details:
commit 372e722ea4dd4ca11c3d04845e11cbc15f32144c
Author: Alexandre Courbot <acourbot@nvidia.com>
Date: Sun Feb 3 01:29:29 2013 +0900
gpiolib: use descriptors internally
Make sure gpiolib works internally with descriptors and (chip, offset)
pairs instead of using the global integer namespace. This prepares the
ground for the removal of the global gpio_desc[] array and the
introduction of the descriptor-based GPIO API.
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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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