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
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
|
#define _GNU_SOURCE
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <argp.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include "openbmc_intf.h"
#include "gpio.h"
int gpio_writec(GPIO* gpio, char value)
{
g_assert (gpio != NULL);
int rc = GPIO_OK;
char buf[1];
buf[0] = value;
if (write(gpio->fd, buf, 1) != 1)
{
rc = GPIO_WRITE_ERROR;
}
return rc;
}
int gpio_write(GPIO* gpio, uint8_t value)
{
g_assert (gpio != NULL);
int rc = GPIO_OK;
char buf[1];
buf[0] = '0';
if (value==1)
{
buf[0]='1';
}
if (write(gpio->fd, buf, 1) != 1)
{
rc = GPIO_WRITE_ERROR;
}
return rc;
}
int gpio_read(GPIO* gpio, uint8_t *value)
{
g_assert (gpio != NULL);
char buf[1];
int r = GPIO_OK;
if (gpio->fd <= 0)
{
r = GPIO_ERROR;
}
else
{
if (read(gpio->fd,&buf,1) != 1)
{
r = GPIO_READ_ERROR;
} else {
if (buf[0]=='1') {
*value = 1;
} else {
*value = 0;
}
}
}
return r;
}
int gpio_clock_cycle(GPIO* gpio, int num_clks) {
g_assert (gpio != NULL);
int i=0;
int r=GPIO_OK;
for (i=0;i<num_clks;i++) {
if (gpio_writec(gpio,'0') == -1) {
r = GPIO_WRITE_ERROR;
break;
}
if (gpio_writec(gpio,'1') == -1) {
r = GPIO_WRITE_ERROR;
break;
}
}
return r;
}
// Gets the gpio device path from gpio manager object
int gpio_init(GDBusConnection *connection, GPIO* gpio)
{
int rc = GPIO_OK;
GDBusProxy *proxy;
GError *error;
GVariant *result;
error = NULL;
g_assert_no_error (error);
error = NULL;
proxy = g_dbus_proxy_new_sync (connection,
G_DBUS_PROXY_FLAGS_NONE,
NULL, /* GDBusInterfaceInfo */
"org.openbmc.managers.System", /* name */
"/org/openbmc/managers/System", /* object path */
"org.openbmc.managers.System", /* interface */
NULL, /* GCancellable */
&error);
if (error != NULL) {
return GPIO_LOOKUP_ERROR;
}
result = g_dbus_proxy_call_sync (proxy,
"gpioInit",
g_variant_new ("(s)", gpio->name),
G_DBUS_CALL_FLAGS_NONE,
-1,
NULL,
&error);
if (error != NULL) {
return GPIO_LOOKUP_ERROR;
}
g_assert (result != NULL);
g_variant_get (result, "(&si&s)", &gpio->dev,&gpio->num,&gpio->direction);
g_print("GPIO Lookup: %s = %d,%s\n",gpio->name,gpio->num,gpio->direction);
//export and set direction
char dev[254];
char data[4];
int fd;
do {
struct stat st;
sprintf(dev,"%s/gpio%d/value",gpio->dev,gpio->num);
//check if gpio is exported, if not export
int result = stat(dev, &st);
if (result)
{
sprintf(dev,"%s/export",gpio->dev);
fd = open(dev, O_WRONLY);
if (fd == GPIO_ERROR) {
rc = GPIO_OPEN_ERROR;
break;
}
sprintf(data,"%d",gpio->num);
rc = write(fd,data,strlen(data));
close(fd);
if (rc != strlen(data)) {
rc = GPIO_WRITE_ERROR;
break;
}
}
const char* file = "edge";
const char* direction = gpio->direction;
if (strcmp(direction, "in") == 0)
{
file = "direction";
}
else if (strcmp(direction, "out") == 0)
{
file = "direction";
// Read current value, so we can set 'high' or 'low'.
// Setting direction directly to 'out' is the same as
// setting to 'low' which can change the value in the
// GPIO.
uint8_t value = 0;
rc = gpio_open(gpio);
if (rc) break;
rc = gpio_read(gpio, &value);
if (rc) break;
gpio_close(gpio);
direction = (value ? "high" : "low");
}
sprintf(dev,"%s/gpio%d/%s",gpio->dev,gpio->num,file);
fd = open(dev,O_WRONLY);
if (fd == GPIO_ERROR) {
rc = GPIO_WRITE_ERROR;
break;
}
rc = write(fd,direction,strlen(direction));
if (rc != strlen(direction)) {
rc = GPIO_WRITE_ERROR;
break;
}
close(fd);
rc = GPIO_OK;
} while(0);
return rc;
}
char* get_gpio_dev(GPIO* gpio)
{
char* buf;
asprintf(&buf, "%s/gpio%d/value", gpio->dev, gpio->num);
return buf;
}
int gpio_open_interrupt(GPIO* gpio, GIOFunc func, gpointer user_data)
{
int rc = GPIO_OK;
char buf[255];
sprintf(buf, "%s/gpio%d/value", gpio->dev, gpio->num);
gpio->fd = open(buf, O_RDONLY | O_NONBLOCK );
gpio->irq_inited = false;
if (gpio->fd == -1)
{
rc = GPIO_OPEN_ERROR;
}
else
{
GIOChannel* channel = g_io_channel_unix_new( gpio->fd);
guint id = g_io_add_watch( channel, G_IO_PRI, func, user_data );
}
return rc;
}
int gpio_open(GPIO* gpio)
{
g_assert (gpio != NULL);
// open gpio for writing or reading
char buf[254];
int rc = 0;
gpio->fd = -1;
if (gpio->direction == NULL) {
return GPIO_OPEN_ERROR;
}
if (strcmp(gpio->direction,"in")==0)
{
sprintf(buf, "%s/gpio%d/value", gpio->dev, gpio->num);
gpio->fd = open(buf, O_RDONLY);
}
else
{
sprintf(buf, "%s/gpio%d/value", gpio->dev, gpio->num);
gpio->fd = open(buf, O_RDWR);
}
if (gpio->fd == -1) {
return GPIO_OPEN_ERROR;
}
return GPIO_OK;
}
void gpio_close(GPIO* gpio)
{
close(gpio->fd);
}
|
