1 | // SPDX-License-Identifier: GPL-2.0 |
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(desc: 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 | |
28 | /* Compatibility: assume unavailable "valid" GPIOs will appear later */ |
29 | if (!desc && gpio_is_valid(number: gpio)) |
30 | return -EPROBE_DEFER; |
31 | |
32 | err = gpiod_request(desc, label); |
33 | if (err) |
34 | return err; |
35 | |
36 | if (flags & GPIOF_ACTIVE_LOW) |
37 | set_bit(FLAG_ACTIVE_LOW, addr: &desc->flags); |
38 | |
39 | if (flags & GPIOF_DIR_IN) |
40 | err = gpiod_direction_input(desc); |
41 | else |
42 | err = gpiod_direction_output_raw(desc, |
43 | value: (flags & GPIOF_INIT_HIGH) ? 1 : 0); |
44 | |
45 | if (err) |
46 | goto free_gpio; |
47 | |
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 | { |
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(number: gpio)) |
62 | return -EPROBE_DEFER; |
63 | |
64 | return gpiod_request(desc, label); |
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); |
102 | |