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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 if (flags & GPIOF_OPEN_DRAIN)
32 set_bit(FLAG_OPEN_DRAIN, &desc->flags);
33
34 if (flags & GPIOF_OPEN_SOURCE)
35 set_bit(FLAG_OPEN_SOURCE, &desc->flags);
36
37 if (flags & GPIOF_ACTIVE_LOW)
38 set_bit(FLAG_ACTIVE_LOW, &desc->flags);
39
40 err = gpiod_request(desc, label);
41 if (err)
42 return err;
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);