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
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
/*
* Control GPIO pins on the fly
*
* Copyright (c) 2008-2011 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <common.h>
#include <command.h>
#include <dm.h>
#include <asm/gpio.h>
int __weak name_to_gpio(const char *name)
{
return simple_strtoul(name, NULL, 10);
}
enum gpio_cmd {
GPIO_INPUT,
GPIO_SET,
GPIO_CLEAR,
GPIO_TOGGLE,
};
#if defined(CONFIG_DM_GPIO) && !defined(gpio_status)
static const char * const gpio_function[] = {
"input",
"output",
"unknown",
};
static void show_gpio(struct udevice *dev, const char *bank_name, int offset)
{
struct dm_gpio_ops *ops = gpio_get_ops(dev);
char buf[80];
int ret;
*buf = '\0';
if (ops->get_state) {
ret = ops->get_state(dev, offset, buf, sizeof(buf));
if (ret) {
puts("<unknown>");
return;
}
} else {
int func = GPIOF_UNKNOWN;
int ret;
if (ops->get_function) {
ret = ops->get_function(dev, offset);
if (ret >= 0 && ret < ARRAY_SIZE(gpio_function))
func = ret;
}
sprintf(buf, "%s%u: %8s %d", bank_name, offset,
gpio_function[func], ops->get_value(dev, offset));
}
puts(buf);
puts("\n");
}
static int do_gpio_status(const char *gpio_name)
{
struct udevice *dev;
int newline = 0;
int ret;
if (gpio_name && !*gpio_name)
gpio_name = NULL;
for (ret = uclass_first_device(UCLASS_GPIO, &dev);
dev;
ret = uclass_next_device(&dev)) {
const char *bank_name;
int num_bits;
bank_name = gpio_get_bank_info(dev, &num_bits);
if (!gpio_name || !bank_name ||
!strncmp(gpio_name, bank_name, strlen(bank_name))) {
const char *p = NULL;
int offset;
if (bank_name) {
if (newline)
putc('\n');
printf("Bank %s:\n", bank_name);
}
newline = 1;
if (gpio_name && bank_name) {
p = gpio_name + strlen(bank_name);
offset = simple_strtoul(p, NULL, 10);
show_gpio(dev, bank_name, offset);
} else {
for (offset = 0; offset < num_bits; offset++)
show_gpio(dev, bank_name, offset);
}
}
}
return ret;
}
#endif
static int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
unsigned int gpio;
enum gpio_cmd sub_cmd;
ulong value;
const char *str_cmd, *str_gpio = NULL;
#ifdef CONFIG_DM_GPIO
int ret;
#endif
if (argc < 2)
show_usage:
return CMD_RET_USAGE;
str_cmd = argv[1];
if (argc > 2)
str_gpio = argv[2];
if (!strcmp(str_cmd, "status")) {
/* Support deprecated gpio_status() */
#ifdef gpio_status
gpio_status();
return 0;
#elif defined(CONFIG_DM_GPIO)
return cmd_process_error(cmdtp, do_gpio_status(str_gpio));
#else
goto show_usage;
#endif
}
if (!str_gpio)
goto show_usage;
/* parse the behavior */
switch (*str_cmd) {
case 'i': sub_cmd = GPIO_INPUT; break;
case 's': sub_cmd = GPIO_SET; break;
case 'c': sub_cmd = GPIO_CLEAR; break;
case 't': sub_cmd = GPIO_TOGGLE; break;
default: goto show_usage;
}
#if defined(CONFIG_DM_GPIO)
/*
* TODO(sjg@chromium.org): For now we must fit into the existing GPIO
* framework, so we look up the name here and convert it to a GPIO number.
* Once all GPIO drivers are converted to driver model, we can change the
* code here to use the GPIO uclass interface instead of the numbered
* GPIO compatibility layer.
*/
ret = gpio_lookup_name(str_gpio, NULL, NULL, &gpio);
if (ret)
return cmd_process_error(cmdtp, ret);
#else
/* turn the gpio name into a gpio number */
gpio = name_to_gpio(str_gpio);
if (gpio < 0)
goto show_usage;
#endif
/* grab the pin before we tweak it */
if (gpio_request(gpio, "cmd_gpio")) {
printf("gpio: requesting pin %u failed\n", gpio);
return -1;
}
/* finally, let's do it: set direction and exec command */
if (sub_cmd == GPIO_INPUT) {
gpio_direction_input(gpio);
value = gpio_get_value(gpio);
} else {
switch (sub_cmd) {
case GPIO_SET: value = 1; break;
case GPIO_CLEAR: value = 0; break;
case GPIO_TOGGLE: value = !gpio_get_value(gpio); break;
default: goto show_usage;
}
gpio_direction_output(gpio, value);
}
printf("gpio: pin %s (gpio %i) value is %lu\n",
str_gpio, gpio, value);
gpio_free(gpio);
return value;
}
U_BOOT_CMD(gpio, 3, 0, do_gpio,
"query and control gpio pins",
"<input|set|clear|toggle> <pin>\n"
" - input/set/clear/toggle the specified pin\n"
"gpio status [<bank> | <pin>]");
|
