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/*
* Copyright (C) 2014 Paul Kocialkowski <contact@paulk.fr>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <dirent.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <linux/input.h>
#define LOG_TAG "gta04_vibrator"
#include <cutils/log.h>
/*
* Globals
*/
const char rumble_input[] = "twl4030:vibrator";
int rumble_fd = -1;
int rumble_id = -1;
/*
* Input
*/
void input_event_set(struct input_event *event, int type, int code, int value)
{
if (event == NULL)
return;
memset(event, 0, sizeof(struct input_event));
event->type = type,
event->code = code;
event->value = value;
gettimeofday(&event->time, NULL);
}
int input_open(const char *name)
{
DIR *d;
struct dirent *di;
char input_name[80] = { 0 };
char path[PATH_MAX];
char *c;
int fd;
int rc;
if (name == NULL)
return -EINVAL;
d = opendir("/dev/input");
if (d == NULL)
return -1;
while ((di = readdir(d))) {
if (di == NULL || strcmp(di->d_name, ".") == 0 || strcmp(di->d_name, "..") == 0)
continue;
snprintf(path, PATH_MAX, "/dev/input/%s", di->d_name);
fd = open(path, O_RDWR | O_NONBLOCK);
if (fd < 0)
continue;
rc = ioctl(fd, EVIOCGNAME(sizeof(input_name) - 1), &input_name);
if (rc < 0)
continue;
c = strstr((char *) &input_name, "\n");
if (c != NULL)
*c = '\0';
if (strcmp(input_name, name) == 0)
return fd;
else
close(fd);
}
return -1;
}
/*
* Vibrator
*/
int vibrator_exists(void)
{
int fd;
fd = input_open(rumble_input);
if (fd < 0)
return 0;
close(fd);
return 1;
}
int sendit(int duration)
{
struct input_event event;
struct ff_effect effect;
int rc;
if (rumble_fd < 0)
rumble_fd = input_open(rumble_input);
if (rumble_fd < 0)
goto error;
if (rumble_id >= 0) {
input_event_set(&event, EV_FF, rumble_id, 0);
rc = write(rumble_fd, &event, sizeof(event));
if (rc < (int) sizeof(event))
goto error;
ioctl(rumble_fd, EVIOCRMFF, &rumble_id);
rumble_id = -1;
}
// Previous code should have removed the effect already
if (duration == 0) {
rc = 0;
goto complete;
}
memset(&effect, 0, sizeof(effect));
effect.type = FF_RUMBLE;
effect.id = -1;
effect.replay.length = duration;
effect.replay.delay = 0;
effect.u.rumble.strong_magnitude = 0xffff;
rc = ioctl(rumble_fd, EVIOCSFF, &effect);
if (rc < 0)
goto error;
rumble_id = effect.id;
input_event_set(&event, EV_FF, rumble_id, 1);
rc = write(rumble_fd, &event, sizeof(event));
if (rc < (int) sizeof(event))
goto error;
rc = 0;
goto complete;
error:
if (rumble_fd >= 0) {
if (rumble_id >= 0) {
input_event_set(&event, EV_FF, rumble_id, 0);
write(rumble_fd, &event, sizeof(event));
ioctl(rumble_fd, EVIOCRMFF, &rumble_id);
rumble_id = -1;
}
close(rumble_fd);
rumble_fd = -1;
}
rc = -1;
complete:
return rc;
}
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