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
|
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "../port/error.h"
#include "io.h"
enum{
Qdir,
Qgpioset,
Qgpioclear,
Qgpioedge,
Qgpioctl,
Qgpiostatus,
};
Dirtab gpiodir[]={
".", {Qdir,0}, 0, 0555,
"gpioset", {Qgpioset, 0}, 0, 0664,
"gpioclear", {Qgpioclear, 0}, 0, 0664,
"gpioedge", {Qgpioedge, 0}, 0, 0664,
"gpioctl", {Qgpioctl,0}, 0, 0664,
"gpiostatus", {Qgpiostatus,0}, 0, 0444,
};
static Chan*
gpioattach(char* spec)
{
return devattach('G', spec);
}
static Walkqid*
gpiowalk(Chan* c, Chan *nc, char **name, int nname)
{
return devwalk(c, nc, name, nname, gpiodir, nelem(gpiodir), devgen);
}
static int
gpiostat(Chan* c, uchar *dp, int n)
{
return devstat(c, dp, n, gpiodir, nelem(gpiodir), devgen);
}
static Chan*
gpioopen(Chan* c, int omode)
{
return devopen(c, omode, gpiodir, nelem(gpiodir), devgen);
}
static void
gpioclose(Chan*)
{
}
static long
gpioread(Chan* c, void *buf, long n, vlong offset)
{
char str[128];
GpioReg *g;
if(c->qid.type & QTDIR)
return devdirread(c, buf, n, gpiodir, nelem(gpiodir), devgen);
g = GPIOREG;
switch((ulong)c->qid.path){
case Qgpioset:
case Qgpioclear:
sprint(str, "%8.8lux", g->gplr);
break;
case Qgpioedge:
sprint(str, "%8.8lux", g->gedr);
break;
case Qgpioctl:
/* return 0; */
case Qgpiostatus:
snprint(str, sizeof(str), "GPDR:%8.8lux\nGRER:%8.8lux\nGFER:%8.8lux\nGAFR:%8.8lux\nGPLR:%8.8lux\n", g->gpdr, g->grer, g->gfer, g->gafr, g->gplr);
break;
default:
error(Ebadarg);
return 0;
}
return readstr(offset, buf, n, str);
}
static long
gpiowrite(Chan *c, void *a, long n, vlong)
{
char buf[128], *field[3];
int pin, set;
ulong *r;
GpioReg *g;
if(n >= sizeof(buf))
n = sizeof(buf)-1;
memmove(buf, a, n);
buf[n] = 0;
g = GPIOREG;
switch((ulong)c->qid.path){
case Qgpioset:
g->gpsr = strtol(buf, 0, 16);
break;
case Qgpioclear:
g->gpcr = strtol(buf, 0, 16);
break;
case Qgpioedge:
g->gedr = strtol(buf, 0, 16);
break;
case Qgpioctl:
if(getfields(buf, field, 3, 1, " \n\t") == 3) {
pin = strtol(field[1], 0, 0);
if(pin < 0 || pin >= 32)
error(Ebadarg);
set = strtol(field[2], 0, 0);
switch(*field[0]) {
case 'd':
r = &g->gpdr;
break;
case 'r':
r = &g->grer;
break;
case 'f':
r = &g->gfer;
break;
case 'a':
r = &g->gafr;
break;
default:
error(Ebadarg);
return 0;
}
if(set)
*r |= 1 << pin;
else
*r &= ~(1 << pin);
} else
error(Ebadarg);
break;
default:
error(Ebadusefd);
return 0;
}
return n;
}
Dev gpiodevtab = {
'G',
"gpio",
devreset,
devinit,
devshutdown,
gpioattach,
gpiowalk,
gpiostat,
gpioopen,
devcreate,
gpioclose,
gpioread,
devbread,
gpiowrite,
devbwrite,
devremove,
devwstat,
};
|
