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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/epoll.h>
#include <linux/input.h>
#include "minui.h"
#define MAX_DEVICES 16
#define MAX_MISC_FDS 16
#define BITS_PER_LONG (sizeof(unsigned long) * 8)
#define BITS_TO_LONGS(x) (((x) + BITS_PER_LONG - 1) / BITS_PER_LONG)
#define test_bit(bit, array) \
((array)[(bit)/BITS_PER_LONG] & (1 << ((bit) % BITS_PER_LONG)))
struct fd_info {
int fd;
ev_callback cb;
void *data;
};
static int epollfd;
static struct epoll_event polledevents[MAX_DEVICES + MAX_MISC_FDS];
static int npolledevents;
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;
struct epoll_event ev;
bool epollctlfail = false;
epollfd = epoll_create(MAX_DEVICES + MAX_MISC_FDS);
if (epollfd == -1)
return -1;
dir = opendir("/dev/input");
if(dir != 0) {
while((de = readdir(dir))) {
unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)];
// 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.events = EPOLLIN | EPOLLWAKEUP;
ev.data.ptr = (void *)&ev_fdinfo[ev_count];
if (epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &ev)) {
close(fd);
epollctlfail = true;
continue;
}
ev_fdinfo[ev_count].fd = fd;
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;
}
}
if (epollctlfail && !ev_count) {
close(epollfd);
epollfd = -1;
return -1;
}
return 0;
}
int ev_add_fd(int fd, ev_callback cb, void *data)
{
struct epoll_event ev;
int ret;
if (ev_misc_count == MAX_MISC_FDS || cb == NULL)
return -1;
ev.events = EPOLLIN | EPOLLWAKEUP;
ev.data.ptr = (void *)&ev_fdinfo[ev_count];
ret = epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &ev);
if (!ret) {
ev_fdinfo[ev_count].fd = fd;
ev_fdinfo[ev_count].cb = cb;
ev_fdinfo[ev_count].data = data;
ev_count++;
ev_misc_count++;
}
return ret;
}
int ev_get_epollfd(void)
{
return epollfd;
}
void ev_exit(void)
{
while (ev_count > 0) {
close(ev_fdinfo[--ev_count].fd);
}
ev_misc_count = 0;
ev_dev_count = 0;
close(epollfd);
}
int ev_wait(int timeout)
{
npolledevents = epoll_wait(epollfd, polledevents, ev_count, timeout);
if (npolledevents <= 0)
return -1;
return 0;
}
void ev_dispatch(void)
{
int n;
int ret;
for (n = 0; n < npolledevents; n++) {
struct fd_info *fdi = polledevents[n].data.ptr;
ev_callback cb = fdi->cb;
if (cb)
cb(fdi->fd, polledevents[n].events, fdi->data);
}
}
int ev_get_input(int fd, uint32_t epevents, struct input_event *ev)
{
int r;
if (epevents & EPOLLIN) {
r = read(fd, ev, sizeof(*ev));
if (r == sizeof(*ev))
return 0;
}
return -1;
}
int ev_sync_key_state(ev_set_key_callback set_key_cb, void *data)
{
unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)];
unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)];
unsigned i;
int ret;
for (i = 0; i < ev_dev_count; i++) {
int code;
memset(key_bits, 0, sizeof(key_bits));
memset(ev_bits, 0, sizeof(ev_bits));
ret = ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits);
if (ret < 0 || !test_bit(EV_KEY, ev_bits))
continue;
ret = ioctl(ev_fdinfo[i].fd, EVIOCGKEY(sizeof(key_bits)), key_bits);
if (ret < 0)
continue;
for (code = 0; code <= KEY_MAX; code++) {
if (test_bit(code, key_bits))
set_key_cb(code, 1, data);
}
}
return 0;
}
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