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);
114