1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include <linux/gpio/consumer.h>
3*4882a593Smuzhiyun #include <linux/gpio/driver.h>
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #include <linux/gpio.h>
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include "gpiolib.h"
8*4882a593Smuzhiyun
gpio_free(unsigned gpio)9*4882a593Smuzhiyun void gpio_free(unsigned gpio)
10*4882a593Smuzhiyun {
11*4882a593Smuzhiyun gpiod_free(gpio_to_desc(gpio));
12*4882a593Smuzhiyun }
13*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(gpio_free);
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun /**
16*4882a593Smuzhiyun * gpio_request_one - request a single GPIO with initial configuration
17*4882a593Smuzhiyun * @gpio: the GPIO number
18*4882a593Smuzhiyun * @flags: GPIO configuration as specified by GPIOF_*
19*4882a593Smuzhiyun * @label: a literal description string of this GPIO
20*4882a593Smuzhiyun */
gpio_request_one(unsigned gpio,unsigned long flags,const char * label)21*4882a593Smuzhiyun int gpio_request_one(unsigned gpio, unsigned long flags, const char *label)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun struct gpio_desc *desc;
24*4882a593Smuzhiyun int err;
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun desc = gpio_to_desc(gpio);
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun /* Compatibility: assume unavailable "valid" GPIOs will appear later */
29*4882a593Smuzhiyun if (!desc && gpio_is_valid(gpio))
30*4882a593Smuzhiyun return -EPROBE_DEFER;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun err = gpiod_request(desc, label);
33*4882a593Smuzhiyun if (err)
34*4882a593Smuzhiyun return err;
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun if (flags & GPIOF_OPEN_DRAIN)
37*4882a593Smuzhiyun set_bit(FLAG_OPEN_DRAIN, &desc->flags);
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun if (flags & GPIOF_OPEN_SOURCE)
40*4882a593Smuzhiyun set_bit(FLAG_OPEN_SOURCE, &desc->flags);
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun if (flags & GPIOF_ACTIVE_LOW)
43*4882a593Smuzhiyun set_bit(FLAG_ACTIVE_LOW, &desc->flags);
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun if (flags & GPIOF_DIR_IN)
46*4882a593Smuzhiyun err = gpiod_direction_input(desc);
47*4882a593Smuzhiyun else
48*4882a593Smuzhiyun err = gpiod_direction_output_raw(desc,
49*4882a593Smuzhiyun (flags & GPIOF_INIT_HIGH) ? 1 : 0);
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun if (err)
52*4882a593Smuzhiyun goto free_gpio;
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun if (flags & GPIOF_EXPORT) {
55*4882a593Smuzhiyun err = gpiod_export(desc, flags & GPIOF_EXPORT_CHANGEABLE);
56*4882a593Smuzhiyun if (err)
57*4882a593Smuzhiyun goto free_gpio;
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun return 0;
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun free_gpio:
63*4882a593Smuzhiyun gpiod_free(desc);
64*4882a593Smuzhiyun return err;
65*4882a593Smuzhiyun }
66*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(gpio_request_one);
67*4882a593Smuzhiyun
gpio_request(unsigned gpio,const char * label)68*4882a593Smuzhiyun int gpio_request(unsigned gpio, const char *label)
69*4882a593Smuzhiyun {
70*4882a593Smuzhiyun struct gpio_desc *desc = gpio_to_desc(gpio);
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun /* Compatibility: assume unavailable "valid" GPIOs will appear later */
73*4882a593Smuzhiyun if (!desc && gpio_is_valid(gpio))
74*4882a593Smuzhiyun return -EPROBE_DEFER;
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun return gpiod_request(desc, label);
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(gpio_request);
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun /**
81*4882a593Smuzhiyun * gpio_request_array - request multiple GPIOs in a single call
82*4882a593Smuzhiyun * @array: array of the 'struct gpio'
83*4882a593Smuzhiyun * @num: how many GPIOs in the array
84*4882a593Smuzhiyun */
gpio_request_array(const struct gpio * array,size_t num)85*4882a593Smuzhiyun int gpio_request_array(const struct gpio *array, size_t num)
86*4882a593Smuzhiyun {
87*4882a593Smuzhiyun int i, err;
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun for (i = 0; i < num; i++, array++) {
90*4882a593Smuzhiyun err = gpio_request_one(array->gpio, array->flags, array->label);
91*4882a593Smuzhiyun if (err)
92*4882a593Smuzhiyun goto err_free;
93*4882a593Smuzhiyun }
94*4882a593Smuzhiyun return 0;
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun err_free:
97*4882a593Smuzhiyun while (i--)
98*4882a593Smuzhiyun gpio_free((--array)->gpio);
99*4882a593Smuzhiyun return err;
100*4882a593Smuzhiyun }
101*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(gpio_request_array);
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun /**
104*4882a593Smuzhiyun * gpio_free_array - release multiple GPIOs in a single call
105*4882a593Smuzhiyun * @array: array of the 'struct gpio'
106*4882a593Smuzhiyun * @num: how many GPIOs in the array
107*4882a593Smuzhiyun */
gpio_free_array(const struct gpio * array,size_t num)108*4882a593Smuzhiyun void gpio_free_array(const struct gpio *array, size_t num)
109*4882a593Smuzhiyun {
110*4882a593Smuzhiyun while (num--)
111*4882a593Smuzhiyun gpio_free((array++)->gpio);
112*4882a593Smuzhiyun }
113*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(gpio_free_array);
114