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/* Based on: https://xnux.eu/devices/feature/vibrator.html#toc-example-program-to-control-the-vibration-motor */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <stdbool.h>
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/input.h>
void syscall_error(int is_err, const char* fmt, ...)
{
va_list ap;
if (!is_err)
return;
printf("ERROR: ");
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
printf(": %s\n", strerror(errno));
exit(1);
}
int open_event_dev(const char* name_needle, int flags)
{
char path[256];
char name[256];
int fd, ret;
// find the right device and open it
for (int i = 0; i < 10; i++) {
snprintf(path, sizeof path, "/dev/input/event%d", i);
fd = open(path, flags);
if (fd < 0)
continue;
ret = ioctl(fd, EVIOCGNAME(256), name);
if (ret < 0)
continue;
if (strstr(name, name_needle))
return fd;
close(fd);
}
errno = ENOENT;
return -1;
}
void usage() {
fprintf(stderr, "Usage: sxmo_vibratepine duration_ms\n");
fprintf(stderr, " sxmo_vibratepine duration_ms strength_number\n");
}
int main(int argc, char* argv[])
{
int fd, ret;
struct pollfd pfds[1];
int effects;
int durationMs, strength;
if (argc < 2) {
usage();
return 1;
}
argc--;
if (argc > 1) {
strength = atoi(argv[argc--]);
} else {
strength = 4000;
}
durationMs = atoi(argv[argc--]);
fd = open_event_dev("vibrator", O_RDWR | O_CLOEXEC);
syscall_error(fd < 0, "Can't open vibrator event device");
ret = ioctl(fd, EVIOCGEFFECTS, &effects);
syscall_error(ret < 0, "EVIOCGEFFECTS failed");
struct ff_effect e = {
.type = FF_RUMBLE,
.id = -1,
.u.rumble = { .strong_magnitude = strength },
};
ret = ioctl(fd, EVIOCSFF, &e);
syscall_error(ret < 0, "EVIOCSFF failed");
struct input_event play = { .type = EV_FF, .code = e.id, .value = 3 };
ret = write(fd, &play, sizeof play);
syscall_error(ret < 0, "write failed");
usleep(durationMs * 1000);
ret = ioctl(fd, EVIOCRMFF, e.id);
syscall_error(ret < 0, "EVIOCRMFF failed");
close(fd);
return 0;
}