Commit | Line | Data |
---|---|---|
122c94de AC |
1 | #include <linux/gpio/consumer.h> |
2 | #include <linux/gpio/driver.h> | |
3 | ||
4 | #include <linux/gpio.h> | |
5 | ||
6 | #include "gpiolib.h" | |
7 | ||
8 | void gpio_free(unsigned gpio) | |
9 | { | |
10 | gpiod_free(gpio_to_desc(gpio)); | |
11 | } | |
12 | EXPORT_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 | */ | |
20 | int 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 | ||
0e9a5edf AC |
27 | /* Compatibility: assume unavailable "valid" GPIOs will appear later */ |
28 | if (!desc && gpio_is_valid(gpio)) | |
29 | return -EPROBE_DEFER; | |
30 | ||
85b03b30 JH |
31 | err = gpiod_request(desc, label); |
32 | if (err) | |
33 | return err; | |
34 | ||
122c94de AC |
35 | if (flags & GPIOF_OPEN_DRAIN) |
36 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
37 | ||
38 | if (flags & GPIOF_OPEN_SOURCE) | |
39 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
40 | ||
2be00173 GR |
41 | if (flags & GPIOF_ACTIVE_LOW) |
42 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
43 | ||
122c94de AC |
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 | } | |
65 | EXPORT_SYMBOL_GPL(gpio_request_one); | |
66 | ||
67 | int gpio_request(unsigned gpio, const char *label) | |
68 | { | |
0e9a5edf AC |
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); | |
122c94de AC |
76 | } |
77 | EXPORT_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 | */ | |
84 | int 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 | ||
95 | err_free: | |
96 | while (i--) | |
97 | gpio_free((--array)->gpio); | |
98 | return err; | |
99 | } | |
100 | EXPORT_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 | */ | |
107 | void gpio_free_array(const struct gpio *array, size_t num) | |
108 | { | |
109 | while (num--) | |
110 | gpio_free((array++)->gpio); | |
111 | } | |
112 | EXPORT_SYMBOL_GPL(gpio_free_array); |