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
|
#define _XOPEN_SOURCE 700
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#define ACPID_SOCK_PATH "/var/run/acpid.socket"
/* once to go into tablet mode, twice to come out */
#define ACPI_ROTATE "ibm/hotkey LEN0068:00 00000080 000060c0\n"
/* once on keydown, once on keyup */
#define ACPI_ROTATELOCK "ibm/hotkey LEN0068:00 00000080 00006020\n"
#define FIXME_HARDCODED_DEV_NUMBER 4
#define GRAVITY_CUTOFF (7.0)
#define DEV_PATH "/sys/bus/iio/devices/iio:device%d"
#define SCALE_FILE "in_accel_scale"
#define X_RAW_FILE "in_accel_x_raw"
#define Y_RAW_FILE "in_accel_y_raw"
int tabletmode = 0;
int rotatelock = 0;
enum { NORMAL, LEFT, INVERTED, RIGHT } rotation = NORMAL;
int openacpi(const char *path)
{
struct sockaddr_un sun = {0};
int sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (sock == -1) {
return -1;
}
sun.sun_family = AF_UNIX;
strcpy(sun.sun_path, path ? path : ACPID_SOCK_PATH);
if (connect(sock, (const struct sockaddr*)&sun, sizeof(sun)) == -1) {
close(sock);
return -1;
}
return sock;
}
void checkacpi(int acpi)
{
static int nrotate = 0;
static int nlock = 0;
char buf[BUFSIZ];
ssize_t n = read(acpi, buf, sizeof(buf));
if (n <= 0) {
return;
}
if (!strcmp(buf, ACPI_ROTATE)) {
nrotate++;
if (nrotate == 1) {
printf("Entering tablet mode\n");
tabletmode = 1;
} else if (nrotate == 3) {
printf("Leaving tablet mode\n");
tabletmode = 0;
nrotate = 0;
}
} else if (!strcmp(buf, ACPI_ROTATELOCK)) {
nlock++;
if (nlock == 2) {
nlock = 0;
rotatelock = ! rotatelock;
printf("Set rotate lock to %d\n", rotatelock);
}
}
}
FILE *opendevfile(const char *file)
{
static char devdir[sizeof(DEV_PATH) + 5] = { '\0' };
char *path = NULL;
if (devdir[0] == '\0') {
sprintf(devdir, DEV_PATH, FIXME_HARDCODED_DEV_NUMBER);
}
path = malloc(strlen(devdir) + strlen(file) + 4);
sprintf(path, "%s/%s", devdir, file);
FILE *dev = fopen(path, "r");
free(path);
return dev;
}
double getgravity(double cutoff)
{
FILE *scale = opendevfile(SCALE_FILE);
if (scale == NULL) {
return cutoff;
}
double scalefactor;
fscanf(scale, "%lf", &scalefactor);
fclose(scale);
return cutoff / scalefactor;
}
double getraw(const char *file)
{
double value = 0.0;
FILE *raw = opendevfile(file);
if (raw) {
fscanf(raw, "%lg", &value);
fclose(raw);
}
return value;
}
int main(void)
{
double gravity = getgravity(GRAVITY_CUTOFF);
printf("Grativational cutoff is %lf\n", gravity);
int acpi = openacpi(NULL);
if (acpi == -1) {
tabletmode = 1;
rotatelock = 0;
rotation = NORMAL;
}
for (;;) {
int nfds = 0;
fd_set fds = acpi + 1;
FD_ZERO(&fds);
struct timeval to = {0};
to.tv_usec = 5000;
int forever = 0;
if (acpi != -1) {
FD_SET(acpi, &fds);
if (tabletmode == 0 || rotatelock == 1) {
forever = 1;
}
}
select(nfds, &fds, NULL, NULL, forever ? NULL : &to);
if (acpi != -1 && FD_ISSET(acpi, &fds)) {
checkacpi(acpi);
}
if (tabletmode == 1 && rotatelock == 0) {
double x = getraw(X_RAW_FILE);
double y = getraw(Y_RAW_FILE);
printf("X: %lg; Y: %lg\n", x, y);
} else {
printf("Not rotating because tabletmode is %d and rotatelock is %d\n", tabletmode, rotatelock);
}
}
return 1;
}
|
