tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 err = gpiod_request(desc, label);
28 if (err)
29 return err;
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 if (flags & GPIOF_DIR_IN)
41 err = gpiod_direction_input(desc);
42 else
43 err = gpiod_direction_output_raw(desc,
44 (flags & GPIOF_INIT_HIGH) ? 1 : 0);
45
46 if (err)
47 goto free_gpio;
48
49 if (flags & GPIOF_EXPORT) {
50 err = gpiod_export(desc, flags & GPIOF_EXPORT_CHANGEABLE);
51 if (err)
52 goto free_gpio;
53 }
54
55 return 0;
56
57 free_gpio:
58 gpiod_free(desc);
59 return err;
60}
61EXPORT_SYMBOL_GPL(gpio_request_one);
62
63int gpio_request(unsigned gpio, const char *label)
64{
65 return gpiod_request(gpio_to_desc(gpio), label);
66}
67EXPORT_SYMBOL_GPL(gpio_request);
68
69/**
70 * gpio_request_array - request multiple GPIOs in a single call
71 * @array: array of the 'struct gpio'
72 * @num: how many GPIOs in the array
73 */
74int gpio_request_array(const struct gpio *array, size_t num)
75{
76 int i, err;
77
78 for (i = 0; i < num; i++, array++) {
79 err = gpio_request_one(array->gpio, array->flags, array->label);
80 if (err)
81 goto err_free;
82 }
83 return 0;
84
85err_free:
86 while (i--)
87 gpio_free((--array)->gpio);
88 return err;
89}
90EXPORT_SYMBOL_GPL(gpio_request_array);
91
92/**
93 * gpio_free_array - release multiple GPIOs in a single call
94 * @array: array of the 'struct gpio'
95 * @num: how many GPIOs in the array
96 */
97void gpio_free_array(const struct gpio *array, size_t num)
98{
99 while (num--)
100 gpio_free((array++)->gpio);
101}
102EXPORT_SYMBOL_GPL(gpio_free_array);