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#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 rotation { NORMAL, INVERSE, LEFT, RIGHT };
enum rotation setrotation(enum rotation r)
{
static enum rotation prev = NORMAL;
if (r == prev) {
return r;
}
switch (r) {
case NORMAL:
system("xrandr -o normal");
break;
case INVERSE:
system("xrandr -o inverted");
break;
case LEFT:
system("xrandr -o left");
break;
case RIGHT:
system("xrandr -o right");
break;
default:
break;
}
prev = r;
return r;
}
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) {
tabletmode = 1;
} else if (nrotate == 3) {
setrotation(NORMAL);
tabletmode = 0;
nrotate = 0;
}
} else if (!strcmp(buf, ACPI_ROTATELOCK)) {
nlock++;
if (nlock == 2) {
nlock = 0;
rotatelock = ! 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);
int acpi = openacpi(NULL);
if (acpi == -1) {
tabletmode = 1;
rotatelock = 0;
}
for (;;) {
int nfds = acpi + 1;
fd_set fds;
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);
if (y <= -gravity) {
setrotation(NORMAL);
} else if (y >= gravity) {
setrotation(INVERSE);
} else if (x >= gravity) {
setrotation(LEFT);
} else if (x <= -gravity) {
setrotation(RIGHT);
}
}
}
return 1;
}
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