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/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <dirent.h>
#include <sys/poll.h>
#include <linux/input.h>
#include "minui.h"
#define MAX_DEVICES 16
#define MAX_MISC_FDS 16
#define test_bit(bit, array) ((array)[(bit)/8] & (1<<((bit)%8)))
struct fd_info {
ev_callback cb;
void *data;
};
static struct pollfd ev_fds[MAX_DEVICES + MAX_MISC_FDS];
static struct fd_info ev_fdinfo[MAX_DEVICES + MAX_MISC_FDS];
static unsigned ev_count = 0;
static unsigned ev_dev_count = 0;
static unsigned ev_misc_count = 0;
int ev_init(ev_callback input_cb, void *data)
{
DIR *dir;
struct dirent *de;
int fd;
dir = opendir("/dev/input");
if(dir != 0) {
while((de = readdir(dir))) {
uint8_t ev_bits[(EV_MAX + 1) / 8];
// fprintf(stderr,"/dev/input/%s\n", de->d_name);
if(strncmp(de->d_name,"event",5)) continue;
fd = openat(dirfd(dir), de->d_name, O_RDONLY);
if(fd < 0) continue;
/* read the evbits of the input device */
if (ioctl(fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) < 0) {
close(fd);
continue;
}
/* TODO: add ability to specify event masks. For now, just assume
* that only EV_KEY and EV_REL event types are ever needed. */
if (!test_bit(EV_KEY, ev_bits) && !test_bit(EV_REL, ev_bits)) {
close(fd);
continue;
}
ev_fds[ev_count].fd = fd;
ev_fds[ev_count].events = POLLIN;
ev_fdinfo[ev_count].cb = input_cb;
ev_fdinfo[ev_count].data = data;
ev_count++;
ev_dev_count++;
if(ev_dev_count == MAX_DEVICES) break;
}
}
return 0;
}
int ev_add_fd(int fd, ev_callback cb, void *data)
{
if (ev_misc_count == MAX_MISC_FDS || cb == NULL)
return -1;
ev_fds[ev_count].fd = fd;
ev_fds[ev_count].events = POLLIN;
ev_fdinfo[ev_count].cb = cb;
ev_fdinfo[ev_count].data = data;
ev_count++;
ev_misc_count++;
return 0;
}
void ev_exit(void)
{
while (ev_count > 0) {
close(ev_fds[--ev_count].fd);
}
ev_misc_count = 0;
ev_dev_count = 0;
}
int ev_wait(int timeout)
{
int r;
r = poll(ev_fds, ev_count, timeout);
if (r <= 0)
return -1;
return 0;
}
void ev_dispatch(void)
{
unsigned n;
int ret;
for (n = 0; n < ev_count; n++) {
ev_callback cb = ev_fdinfo[n].cb;
if (cb && (ev_fds[n].revents & ev_fds[n].events))
cb(ev_fds[n].fd, ev_fds[n].revents, ev_fdinfo[n].data);
}
}
int ev_get_input(int fd, short revents, struct input_event *ev)
{
int r;
if (revents & POLLIN) {
r = read(fd, ev, sizeof(*ev));
if (r == sizeof(*ev))
return 0;
}
return -1;
}
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