convert emr stylus button events to rubber events
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btor/btor.c

99 lines
2.1 KiB

#define _POSIX_C_SOURCE 200809l
#define _DEFAULT_SOURCE
#include <linux/input.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/epoll.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <stdlib.h>
#include <err.h>
#include <string.h>
#include <dirent.h>
#include <fcntl.h>
#include <unistd.h>
#define test_bit(yalv, abs_b) ((((char *)abs_b)[yalv/8] & (1<<yalv%8)) > 0)
#define EVDEV_ROOT "/dev/input/"
int main(int argc, char **argv)
{
(void)argc;
(void)argv;
DIR *dir = opendir(EVDEV_ROOT);
if (!dir)
err(1, "opendir:");
struct dirent *dp;
struct stat st = {0};
int stylus = -1;
while ((dp = readdir(dir)) != NULL) {
if (fstatat(dirfd(dir), dp->d_name, &st, 0) == -1)
err(1, "fstatat:");
if ((st.st_mode & S_IFMT) != S_IFCHR)
continue;
int tmp_fd = openat(dirfd(dir), dp->d_name, O_RDWR | O_NONBLOCK);
if (tmp_fd < 0)
err(1, "openat:");
union {
char b[EV_MAX];
char k[KEY_MAX];
} vec;
if (ioctl(tmp_fd, EVIOCGBIT(0, EV_MAX), vec.b) < 0)
err(1, "ioctl:");
if (!test_bit(EV_KEY, vec.b))
continue;
if (ioctl(tmp_fd, EVIOCGBIT(EV_KEY, KEY_MAX), vec.k) < 0)
err(1, "ioctl:");
if (test_bit(BTN_STYLUS, vec.k) && test_bit(EV_ABS, vec.k)) {
stylus = tmp_fd;
break;
}
close(tmp_fd);
}
closedir(dir);
if (stylus == -1)
err(1, "no stylus input found");
int poll_set = epoll_create(1);
if (poll_set < 0)
err(1, "epoll_create:");
struct epoll_event poll_ev = { .events = EPOLLIN | EPOLLOUT | EPOLLET };
if (epoll_ctl(poll_set, EPOLL_CTL_ADD, stylus, &poll_ev) < 0)
err(1, "epoll_ctl:");
unsigned char button_recived = 0;
struct input_event in_ev, out_ev;
while (epoll_wait(poll_set, &poll_ev, 1, -1) != -1) {
switch (poll_ev.events) {
case EPOLLIN:
if (read(stylus, &in_ev, sizeof(struct input_event)) < 0)
err(1, "read:");
if (in_ev.type != BTN_STYLUS)
break;
out_ev.type = BTN_TOOL_RUBBER;
out_ev.value = in_ev.value;
button_recived = 1;
break;
case EPOLLOUT:
if (!button_recived)
break;
button_recived = 0;
if (write(stylus, &out_ev, sizeof(struct input_event)) < 0)
err(1, "write:");
break;
default:
break;
}
}
return 0;
}