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
gpio_free(unsigned gpio)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 */
gpio_request_one(unsigned gpio,unsigned long flags,const char * label)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(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, &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 (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
gpio_request(unsigned gpio,const char * label)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(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 */
gpio_request_array(const struct gpio * array,size_t num)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 */
gpio_free_array(const struct gpio * array,size_t num)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
