Commit | Line | Data |
---|---|---|
dae5f0af | 1 | // SPDX-License-Identifier: GPL-2.0 |
122c94de AC |
2 | #include <linux/gpio/consumer.h> |
3 | #include <linux/gpio/driver.h> | |
4 | ||
5 | #include <linux/gpio.h> | |
6 | ||
7 | #include "gpiolib.h" | |
8 | ||
9 | void gpio_free(unsigned gpio) | |
10 | { | |
11 | gpiod_free(gpio_to_desc(gpio)); | |
12 | } | |
13 | EXPORT_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 | */ | |
21 | int 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 | ||
0e9a5edf AC |
28 | /* Compatibility: assume unavailable "valid" GPIOs will appear later */ |
29 | if (!desc && gpio_is_valid(gpio)) | |
30 | return -EPROBE_DEFER; | |
31 | ||
85b03b30 JH |
32 | err = gpiod_request(desc, label); |
33 | if (err) | |
34 | return err; | |
35 | ||
122c94de AC |
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 | ||
2be00173 GR |
42 | if (flags & GPIOF_ACTIVE_LOW) |
43 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
44 | ||
122c94de AC |
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 | } | |
66 | EXPORT_SYMBOL_GPL(gpio_request_one); | |
67 | ||
68 | int gpio_request(unsigned gpio, const char *label) | |
69 | { | |
0e9a5edf AC |
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); | |
122c94de AC |
77 | } |
78 | EXPORT_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 | */ | |
85 | int 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 | ||
96 | err_free: | |
97 | while (i--) | |
98 | gpio_free((--array)->gpio); | |
99 | return err; | |
100 | } | |
101 | EXPORT_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 | */ | |
108 | void gpio_free_array(const struct gpio *array, size_t num) | |
109 | { | |
110 | while (num--) | |
111 | gpio_free((array++)->gpio); | |
112 | } | |
113 | EXPORT_SYMBOL_GPL(gpio_free_array); |