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