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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 | ||
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_DIR_IN) | |
38 | err = gpiod_direction_input(desc); | |
39 | else | |
40 | err = gpiod_direction_output_raw(desc, | |
41 | (flags & GPIOF_INIT_HIGH) ? 1 : 0); | |
42 | ||
43 | if (err) | |
44 | goto free_gpio; | |
45 | ||
46 | if (flags & GPIOF_EXPORT) { | |
47 | err = gpiod_export(desc, flags & GPIOF_EXPORT_CHANGEABLE); | |
48 | if (err) | |
49 | goto free_gpio; | |
50 | } | |
51 | ||
52 | return 0; | |
53 | ||
54 | free_gpio: | |
55 | gpiod_free(desc); | |
56 | return err; | |
57 | } | |
58 | EXPORT_SYMBOL_GPL(gpio_request_one); | |
59 | ||
60 | int gpio_request(unsigned gpio, const char *label) | |
61 | { | |
62 | return gpiod_request(gpio_to_desc(gpio), label); | |
63 | } | |
64 | EXPORT_SYMBOL_GPL(gpio_request); | |
65 | ||
66 | /** | |
67 | * gpio_request_array - request multiple GPIOs in a single call | |
68 | * @array: array of the 'struct gpio' | |
69 | * @num: how many GPIOs in the array | |
70 | */ | |
71 | int gpio_request_array(const struct gpio *array, size_t num) | |
72 | { | |
73 | int i, err; | |
74 | ||
75 | for (i = 0; i < num; i++, array++) { | |
76 | err = gpio_request_one(array->gpio, array->flags, array->label); | |
77 | if (err) | |
78 | goto err_free; | |
79 | } | |
80 | return 0; | |
81 | ||
82 | err_free: | |
83 | while (i--) | |
84 | gpio_free((--array)->gpio); | |
85 | return err; | |
86 | } | |
87 | EXPORT_SYMBOL_GPL(gpio_request_array); | |
88 | ||
89 | /** | |
90 | * gpio_free_array - release multiple GPIOs in a single call | |
91 | * @array: array of the 'struct gpio' | |
92 | * @num: how many GPIOs in the array | |
93 | */ | |
94 | void gpio_free_array(const struct gpio *array, size_t num) | |
95 | { | |
96 | while (num--) | |
97 | gpio_free((array++)->gpio); | |
98 | } | |
99 | EXPORT_SYMBOL_GPL(gpio_free_array); | |
100 | ||
101 | int gpio_lock_as_irq(struct gpio_chip *chip, unsigned int offset) | |
102 | { | |
103 | return gpiod_lock_as_irq(gpiochip_get_desc(chip, offset)); | |
104 | } | |
105 | EXPORT_SYMBOL_GPL(gpio_lock_as_irq); | |
106 | ||
107 | void gpio_unlock_as_irq(struct gpio_chip *chip, unsigned int offset) | |
108 | { | |
109 | return gpiod_unlock_as_irq(gpiochip_get_desc(chip, offset)); | |
110 | } | |
111 | EXPORT_SYMBOL_GPL(gpio_unlock_as_irq); |