1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
/*
* Google LWIS GPIO Interface
*
* Copyright (c) 2018 Google, LLC
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#define pr_fmt(fmt) KBUILD_MODNAME "-gpio: " fmt
#include <linux/gpio.h>
#include <linux/kernel.h>
#include "lwis_gpio.h"
#include "lwis_interrupt.h"
/* debug function */
void lwis_gpio_list_print(char *name, struct gpio_descs *gpios)
{
int i;
if (IS_ERR_OR_NULL(gpios)) {
pr_info("name: %s error: %ld\n", name, PTR_ERR(gpios));
} else {
pr_info("name: %s, count: %d\n", name, gpios->ndescs);
for (i = 0; i < gpios->ndescs; i++) {
pr_info("gpio number: %d\n", desc_to_gpio(gpios->desc[i]));
}
}
}
struct gpio_descs *lwis_gpio_list_get(struct device *dev, const char *name)
{
/* By default, the GPIO pins are acquired but uninitialized */
return devm_gpiod_get_array(dev, name, GPIOD_ASIS);
}
void lwis_gpio_list_put(struct gpio_descs *gpios, struct device *dev)
{
devm_gpiod_put_array(dev, gpios);
}
int lwis_gpio_list_set_output_value(struct gpio_descs *gpios, int value)
{
int i;
int ret;
if (!gpios) {
return -EINVAL;
}
for (i = 0; i < gpios->ndescs; ++i) {
ret = gpiod_direction_output(gpios->desc[i], value);
if (ret) {
pr_err("Failed to set value for GPIO %d\n", i);
return ret;
}
}
return 0;
}
int lwis_gpio_list_set_output_value_raw(struct gpio_descs *gpios, int value)
{
int i;
int ret;
if (!gpios) {
return -EINVAL;
}
for (i = 0; i < gpios->ndescs; ++i) {
ret = gpiod_direction_output_raw(gpios->desc[i], value);
if (ret) {
pr_err("Failed to set value for GPIO %d\n", i);
return ret;
}
}
return 0;
}
int lwis_gpio_list_set_input(struct gpio_descs *gpios)
{
int i;
int ret;
if (!gpios) {
return -EINVAL;
}
for (i = 0; i < gpios->ndescs; ++i) {
ret = gpiod_direction_input(gpios->desc[i]);
if (ret) {
pr_err("Failed to set GPIO %d to input\n", i);
return ret;
}
}
return 0;
}
struct lwis_gpios_list *lwis_gpios_list_alloc(int count)
{
struct lwis_gpios_list *list;
/* No need to allocate if count is invalid */
if (count <= 0) {
return ERR_PTR(-EINVAL);
}
list = kmalloc(sizeof(struct lwis_gpios_list), GFP_KERNEL);
if (!list) {
pr_err("Failed to allocate gpios list\n");
return ERR_PTR(-ENOMEM);
}
list->gpios_info = kmalloc(count * sizeof(struct lwis_gpios_info), GFP_KERNEL);
if (!list->gpios_info) {
pr_err("Failed to allocate lwis_gpios_info instances\n");
kfree(list);
return ERR_PTR(-ENOMEM);
}
list->count = count;
return list;
}
void lwis_gpios_list_free(struct lwis_gpios_list *list)
{
if (!list) {
return;
}
if (list->gpios_info->irq_list) {
lwis_interrupt_list_free(list->gpios_info->irq_list);
}
if (list->gpios_info) {
kfree(list->gpios_info);
}
kfree(list);
}
struct lwis_gpios_info *lwis_gpios_get_info_by_name(struct lwis_gpios_list *list, char *name)
{
int i;
if (!list || !name) {
return ERR_PTR(-EINVAL);
}
for (i = 0; i < list->count; ++i) {
if (!strcmp(list->gpios_info[i].name, name)) {
return &list->gpios_info[i];
}
}
return ERR_PTR(-EINVAL);
}
|
