1// SPDX-License-Identifier: GPL-2.0
  2#include <linux/gpio/consumer.h>
  3#include <linux/gpio/driver.h>
  4
  5#include <linux/gpio.h>
  6
  7#include "gpiolib.h"
  8
  9void gpio_free(unsigned gpio)
 10{
 11	gpiod_free(gpio_to_desc(gpio));
 12}
 13EXPORT_SYMBOL_GPL(gpio_free);
 14
 15/**
 16 * gpio_request_one - request a single GPIO with initial configuration
 17 * @gpio:	the GPIO number
 18 * @flags:	GPIO configuration as specified by GPIOF_*
 19 * @label:	a literal description string of this GPIO
 20 */
 21int gpio_request_one(unsigned gpio, unsigned long flags, const char *label)
 22{
 23	struct gpio_desc *desc;
 24	int err;
 25
 26	desc = gpio_to_desc(gpio);
 27
 28	/* Compatibility: assume unavailable "valid" GPIOs will appear later */
 29	if (!desc && gpio_is_valid(gpio))
 30		return -EPROBE_DEFER;
 31
 32	err = gpiod_request(desc, label);
 33	if (err)
 34		return err;
 35
 36	if (flags & GPIOF_OPEN_DRAIN)
 37		set_bit(FLAG_OPEN_DRAIN, &desc->flags);
 38
 39	if (flags & GPIOF_OPEN_SOURCE)
 40		set_bit(FLAG_OPEN_SOURCE, &desc->flags);
 41
 42	if (flags & GPIOF_ACTIVE_LOW)
 43		set_bit(FLAG_ACTIVE_LOW, &desc->flags);
 44
 45	if (flags & GPIOF_DIR_IN)
 46		err = gpiod_direction_input(desc);
 47	else
 48		err = gpiod_direction_output_raw(desc,
 49				(flags & GPIOF_INIT_HIGH) ? 1 : 0);
 50
 51	if (err)
 52		goto free_gpio;
 53
 54	if (flags & GPIOF_EXPORT) {
 55		err = gpiod_export(desc, flags & GPIOF_EXPORT_CHANGEABLE);
 56		if (err)
 57			goto free_gpio;
 58	}
 59
 60	return 0;
 61
 62 free_gpio:
 63	gpiod_free(desc);
 64	return err;
 65}
 66EXPORT_SYMBOL_GPL(gpio_request_one);
 67
 68int gpio_request(unsigned gpio, const char *label)
 69{
 70	struct gpio_desc *desc = gpio_to_desc(gpio);
 71
 72	/* Compatibility: assume unavailable "valid" GPIOs will appear later */
 73	if (!desc && gpio_is_valid(gpio))
 74		return -EPROBE_DEFER;
 75
 76	return gpiod_request(desc, label);
 77}
 78EXPORT_SYMBOL_GPL(gpio_request);
 79
 80/**
 81 * gpio_request_array - request multiple GPIOs in a single call
 82 * @array:	array of the 'struct gpio'
 83 * @num:	how many GPIOs in the array
 84 */
 85int gpio_request_array(const struct gpio *array, size_t num)
 86{
 87	int i, err;
 88
 89	for (i = 0; i < num; i++, array++) {
 90		err = gpio_request_one(array->gpio, array->flags, array->label);
 91		if (err)
 92			goto err_free;
 93	}
 94	return 0;
 95
 96err_free:
 97	while (i--)
 98		gpio_free((--array)->gpio);
 99	return err;
100}
101EXPORT_SYMBOL_GPL(gpio_request_array);
102
103/**
104 * gpio_free_array - release multiple GPIOs in a single call
105 * @array:	array of the 'struct gpio'
106 * @num:	how many GPIOs in the array
107 */
108void gpio_free_array(const struct gpio *array, size_t num)
109{
110	while (num--)
111		gpio_free((array++)->gpio);
112}
113EXPORT_SYMBOL_GPL(gpio_free_array);