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
|
#include "u.h"
#include "lib.h"
#include "dat.h"
#include "fns.h"
#include "error.h"
static Queue* keyq;
static int kbdinuse;
void
kbdkey(Rune r, int down)
{
char buf[2+UTFmax];
if(r == 0)
return;
if(!kbdinuse || keyq == nil){
if(down)
kbdputc(kbdq, r); /* /dev/cons */
return;
}
memset(buf, 0, sizeof buf);
buf[0] = down ? 'r' : 'R';
qproduce(keyq, buf, 2+runetochar(buf+1, &r));
}
enum{
Qdir,
Qkbd,
};
static Dirtab kbddir[]={
".", {Qdir, 0, QTDIR}, 0, DMDIR|0555,
"kbd", {Qkbd}, 0, 0444,
};
static void
kbdinit(void)
{
keyq = qopen(4*1024, Qcoalesce, 0, 0);
if(keyq == nil)
panic("kbdinit");
qnoblock(keyq, 1);
}
static Chan*
kbdattach(char *spec)
{
return devattach('b', spec);
}
static Walkqid*
kbdwalk(Chan *c, Chan *nc, char **name, int nname)
{
return devwalk(c, nc, name,nname, kbddir, nelem(kbddir), devgen);
}
static int
kbdstat(Chan *c, uchar *dp, int n)
{
return devstat(c, dp, n, kbddir, nelem(kbddir), devgen);
}
static Chan*
kbdopen(Chan *c, int omode)
{
c = devopen(c, omode, kbddir, nelem(kbddir), devgen);
switch((ulong)c->qid.path){
case Qkbd:
if(tas(&kbdinuse) != 0){
c->flag &= ~COPEN;
error(Einuse);
}
break;
}
return c;
}
static void
kbdclose(Chan *c)
{
switch((ulong)c->qid.path){
case Qkbd:
if(c->flag&COPEN)
kbdinuse = 0;
break;
}
}
static long
kbdread(Chan *c, void *buf, long n, vlong off)
{
USED(off);
if(n <= 0)
return n;
switch((ulong)c->qid.path){
case Qdir:
return devdirread(c, buf, n, kbddir, nelem(kbddir), devgen);
case Qkbd:
return qread(keyq, buf, n);
default:
print("kbdread 0x%llux\n", c->qid.path);
error(Egreg);
}
return -1; /* never reached */
}
static long
kbdwrite(Chan *c, void *va, long n, vlong off)
{
USED(c);
USED(va);
USED(n);
USED(off);
error(Eperm);
return -1; /* never reached */
}
Dev kbddevtab = {
'b',
"kbd",
devreset,
kbdinit,
devshutdown,
kbdattach,
kbdwalk,
kbdstat,
kbdopen,
devcreate,
kbdclose,
kbdread,
devbread,
kbdwrite,
devbwrite,
devremove,
devwstat,
};
|
