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#include <dirent.h>
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <linux/input.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
enum stmfts_ev_type {
STMFTS_EV_TYPE_MT_TOUCH,
STMFTS_EV_TYPE_HOVER,
STMFTS_EV_TYPE_KEY
};
#define STMFTS_INPUT_PATH "/dev/input/"
#define STMFTS_INPUT_NAME_SIZE 256
struct stmfts_event {
struct input_event ev;
enum stmfts_ev_type type;
int id;
int x;
int y;
int z; /* distance, for hovering */
int orientation;
int major;
int minor;
int area;
/* key buttons */
int key_menu;
int key_back;
};
static int stmfts_select(const struct dirent *ep)
{
if(ep->d_type != DT_CHR)
return 0;
if(!strstr(ep->d_name, "event"))
return 0;
return 1;
}
int stmfts_read_event(int fd)
{
int ret;
struct stmfts_event sev;
int slot;
memset(&sev, 0, sizeof(sev));
while(1) {
ret = read(fd, &sev.ev, sizeof(sev.ev));
if (ret < 0) {
perror("unable to read from device");
return -1;
}
if (ret != sizeof(sev.ev)) {
error(0, EIO, "unable to read properly");
return -1;
}
switch(sev.ev.type) {
case EV_SYN:
switch (sev.type) {
case STMFTS_EV_TYPE_MT_TOUCH:
printf("touch: [%d] id = %d, x = %d, y = %d, "
"major = %d, minor = %d, orientation = %d, "
"area = %d\n", slot, sev.id, sev.x, sev.y,
sev.major, sev.minor, sev.orientation, sev.area);
break;
case STMFTS_EV_TYPE_HOVER:
printf("hover: x = %d, y = %d, z = %d\n",
sev.x, sev.y, sev.z);
break;
case STMFTS_EV_TYPE_KEY:
if (sev.key_menu < 0)
printf("key: back %s\n", sev.key_back ? "pressed" : "released");
else
printf("key: menu %s\n", sev.key_menu ? "pressed" : "released");
break;
}
memset(&sev, 0, sizeof(sev));
break;
case EV_ABS:
switch(sev.ev.code) {
case ABS_MT_POSITION_X:
sev.type = STMFTS_EV_TYPE_MT_TOUCH;
sev.x = sev.ev.value;
break;
case ABS_MT_POSITION_Y:
sev.type = STMFTS_EV_TYPE_MT_TOUCH;
sev.y = sev.ev.value;
break;
case ABS_MT_TOUCH_MAJOR:
sev.type = STMFTS_EV_TYPE_MT_TOUCH;
sev.major = sev.ev.value;
break;
case ABS_MT_TOUCH_MINOR:
sev.type = STMFTS_EV_TYPE_MT_TOUCH;
sev.minor = sev.ev.value;
break;
case ABS_MT_ORIENTATION:
sev.type = STMFTS_EV_TYPE_MT_TOUCH;
sev.orientation = sev.ev.value;
break;
case ABS_MT_PRESSURE:
sev.type = STMFTS_EV_TYPE_MT_TOUCH;
sev.area = sev.ev.value;
break;
case ABS_MT_TRACKING_ID:
sev.id = sev.ev.value;
break;
case ABS_MT_SLOT:
sev.type = STMFTS_EV_TYPE_MT_TOUCH;
slot = sev.ev.value;
break;
case ABS_X:
sev.type = STMFTS_EV_TYPE_HOVER;
sev.x = sev.ev.value;
break;
case ABS_Y:
sev.type = STMFTS_EV_TYPE_HOVER;
sev.y = sev.ev.value;
break;
case ABS_DISTANCE:
sev.type = STMFTS_EV_TYPE_HOVER;
sev.z = sev.ev.value;
break;
default:
fprintf(stderr, "*** unhandled event code"
"(type = %x, code = %x, value = %d)\n",
sev.ev.type, sev.ev.code, sev.ev.value);
}
break;
case EV_KEY:
switch(sev.ev.code) {
case KEY_MENU:
sev.type = STMFTS_EV_TYPE_KEY;
sev.key_back = -1;
sev.key_menu = sev.ev.value;
break;
case KEY_BACK:
sev.type = STMFTS_EV_TYPE_KEY;
sev.key_menu = -1;
sev.key_back = sev.ev.value;
break;
default:
fprintf(stderr, "*** unhandled event code"
"(type = %x, code = %x, value = %d)\n",
sev.ev.type, sev.ev.code, sev.ev.value);
}
break;
default:
fprintf(stderr, "*** unhandled event type"
"(type = %x, code = %x, value = %d)\n",
sev.ev.type, sev.ev.code, sev.ev.value);
}
}
return -1;
}
int stmfts_open_event(char *fname)
{
struct dirent **eps;
int i;
int n;
int ret = 0;
n = scandir(STMFTS_INPUT_PATH, &eps, stmfts_select, alphasort);
if (!n) {
perror ("couldn't open the directory");
return -1;
}
for (i = 0; i < n; i++) {
char path[64];
int fd;
char dev_name[STMFTS_INPUT_NAME_SIZE];
sprintf(path, STMFTS_INPUT_PATH "%s", eps[i]->d_name);
fd = open(path, O_RDONLY);
if (fd < 0) {
perror("cannot open file");
return -1;
}
ret = ioctl(fd, EVIOCGNAME(STMFTS_INPUT_NAME_SIZE), dev_name);
if (ret < 0) {
perror("unable to get the name");
close(fd);
continue;
}
ret = strncmp(fname, dev_name, STMFTS_INPUT_NAME_SIZE);
if (ret) {
close(fd);
continue;
}
return fd;
}
error(0, ENODEV, "input device not found");
return -1;
}
int stmfts_close_event(int fd)
{
return close(fd);
}
void stmfts_print_usage(char *argv)
{
printf("usage: %s <input dev name>\n", argv);
printf("\n");
printf("\'input dev name\' is the name given by the device driver "
"to the /dev/inputX interface\n");
}
int main(int argc, char *argv[])
{
int fd;
if (argc != 2) {
error(0, EPERM, "missing event name");
stmfts_print_usage(argv[0]);
return -1;
}
fd = stmfts_open_event(argv[1]);
if (fd < 0) {
error(0, ENODEV, "input event not found");
return -1;
}
fd = stmfts_read_event(fd);
if (fd) {
fprintf(stderr, "something went wrong\n");
return -1;
}
return 0;
}
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