Commit | Line | Data |
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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 | ||
2be00173 GR |
36 | if (flags & GPIOF_ACTIVE_LOW) |
37 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
38 | ||
122c94de AC |
39 | if (flags & GPIOF_DIR_IN) |
40 | err = gpiod_direction_input(desc); | |
41 | else | |
42 | err = gpiod_direction_output_raw(desc, | |
43 | (flags & GPIOF_INIT_HIGH) ? 1 : 0); | |
44 | ||
45 | if (err) | |
46 | goto free_gpio; | |
47 | ||
122c94de AC |
48 | return 0; |
49 | ||
50 | free_gpio: | |
51 | gpiod_free(desc); | |
52 | return err; | |
53 | } | |
54 | EXPORT_SYMBOL_GPL(gpio_request_one); | |
55 | ||
56 | int gpio_request(unsigned gpio, const char *label) | |
57 | { | |
0e9a5edf AC |
58 | struct gpio_desc *desc = gpio_to_desc(gpio); |
59 | ||
60 | /* Compatibility: assume unavailable "valid" GPIOs will appear later */ | |
61 | if (!desc && gpio_is_valid(gpio)) | |
62 | return -EPROBE_DEFER; | |
63 | ||
64 | return gpiod_request(desc, label); | |
122c94de AC |
65 | } |
66 | EXPORT_SYMBOL_GPL(gpio_request); | |
67 | ||
68 | /** | |
69 | * gpio_request_array - request multiple GPIOs in a single call | |
70 | * @array: array of the 'struct gpio' | |
71 | * @num: how many GPIOs in the array | |
72 | */ | |
73 | int gpio_request_array(const struct gpio *array, size_t num) | |
74 | { | |
75 | int i, err; | |
76 | ||
77 | for (i = 0; i < num; i++, array++) { | |
78 | err = gpio_request_one(array->gpio, array->flags, array->label); | |
79 | if (err) | |
80 | goto err_free; | |
81 | } | |
82 | return 0; | |
83 | ||
84 | err_free: | |
85 | while (i--) | |
86 | gpio_free((--array)->gpio); | |
87 | return err; | |
88 | } | |
89 | EXPORT_SYMBOL_GPL(gpio_request_array); | |
90 | ||
91 | /** | |
92 | * gpio_free_array - release multiple GPIOs in a single call | |
93 | * @array: array of the 'struct gpio' | |
94 | * @num: how many GPIOs in the array | |
95 | */ | |
96 | void gpio_free_array(const struct gpio *array, size_t num) | |
97 | { | |
98 | while (num--) | |
99 | gpio_free((array++)->gpio); | |
100 | } | |
101 | EXPORT_SYMBOL_GPL(gpio_free_array); |