/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <sys/epoll.h>
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#include <unistd.h>
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#include <string.h>
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#include <linux/input.h>
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#include "minui.h"
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#define MAX_DEVICES 16
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#define MAX_MISC_FDS 16
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#define BITS_PER_LONG (sizeof(unsigned long) * 8)
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#define BITS_TO_LONGS(x) (((x) + BITS_PER_LONG - 1) / BITS_PER_LONG)
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#define test_bit(bit, array) \
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((array)[(bit)/BITS_PER_LONG] & (1 << ((bit) % BITS_PER_LONG)))
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struct fd_info {
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int fd;
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ev_callback cb;
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void *data;
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};
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static int epollfd;
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static struct epoll_event polledevents[MAX_DEVICES + MAX_MISC_FDS];
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static int npolledevents;
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static struct fd_info ev_fdinfo[MAX_DEVICES + MAX_MISC_FDS];
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static unsigned ev_count = 0;
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static unsigned ev_dev_count = 0;
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static unsigned ev_misc_count = 0;
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int ev_init(ev_callback input_cb, void *data)
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{
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DIR *dir;
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struct dirent *de;
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int fd;
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struct epoll_event ev;
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bool epollctlfail = false;
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epollfd = epoll_create(MAX_DEVICES + MAX_MISC_FDS);
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if (epollfd == -1)
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return -1;
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dir = opendir("/dev/input");
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if(dir != 0) {
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while((de = readdir(dir))) {
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unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)];
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// fprintf(stderr,"/dev/input/%s\n", de->d_name);
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if(strncmp(de->d_name,"event",5)) continue;
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fd = openat(dirfd(dir), de->d_name, O_RDONLY);
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if(fd < 0) continue;
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/* read the evbits of the input device */
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if (ioctl(fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) < 0) {
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close(fd);
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continue;
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}
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/* TODO: add ability to specify event masks. For now, just assume
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* that only EV_KEY and EV_REL event types are ever needed. */
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if (!test_bit(EV_KEY, ev_bits) && !test_bit(EV_REL, ev_bits)) {
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close(fd);
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continue;
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}
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ev.events = EPOLLIN | EPOLLWAKEUP;
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ev.data.ptr = (void *)&ev_fdinfo[ev_count];
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if (epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &ev)) {
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close(fd);
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epollctlfail = true;
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continue;
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}
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ev_fdinfo[ev_count].fd = fd;
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ev_fdinfo[ev_count].cb = input_cb;
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ev_fdinfo[ev_count].data = data;
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ev_count++;
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ev_dev_count++;
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if(ev_dev_count == MAX_DEVICES) break;
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}
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}
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if (epollctlfail && !ev_count) {
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close(epollfd);
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epollfd = -1;
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return -1;
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}
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return 0;
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}
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int ev_add_fd(int fd, ev_callback cb, void *data)
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{
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struct epoll_event ev;
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int ret;
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if (ev_misc_count == MAX_MISC_FDS || cb == NULL)
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return -1;
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ev.events = EPOLLIN | EPOLLWAKEUP;
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ev.data.ptr = (void *)&ev_fdinfo[ev_count];
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ret = epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &ev);
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if (!ret) {
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ev_fdinfo[ev_count].fd = fd;
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ev_fdinfo[ev_count].cb = cb;
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ev_fdinfo[ev_count].data = data;
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ev_count++;
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ev_misc_count++;
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}
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return ret;
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}
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int ev_get_epollfd(void)
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{
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return epollfd;
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}
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void ev_exit(void)
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{
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while (ev_count > 0) {
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close(ev_fdinfo[--ev_count].fd);
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}
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ev_misc_count = 0;
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ev_dev_count = 0;
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close(epollfd);
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}
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int ev_wait(int timeout)
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{
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npolledevents = epoll_wait(epollfd, polledevents, ev_count, timeout);
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if (npolledevents <= 0)
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return -1;
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return 0;
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}
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void ev_dispatch(void)
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{
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int n;
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int ret;
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for (n = 0; n < npolledevents; n++) {
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struct fd_info *fdi = polledevents[n].data.ptr;
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ev_callback cb = fdi->cb;
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if (cb)
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cb(fdi->fd, polledevents[n].events, fdi->data);
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}
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}
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int ev_get_input(int fd, uint32_t epevents, struct input_event *ev)
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{
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int r;
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if (epevents & EPOLLIN) {
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r = read(fd, ev, sizeof(*ev));
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if (r == sizeof(*ev))
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return 0;
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}
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return -1;
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}
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int ev_sync_key_state(ev_set_key_callback set_key_cb, void *data)
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{
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unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)];
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unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)];
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unsigned i;
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int ret;
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for (i = 0; i < ev_dev_count; i++) {
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int code;
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memset(key_bits, 0, sizeof(key_bits));
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memset(ev_bits, 0, sizeof(ev_bits));
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ret = ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits);
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if (ret < 0 || !test_bit(EV_KEY, ev_bits))
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continue;
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ret = ioctl(ev_fdinfo[i].fd, EVIOCGKEY(sizeof(key_bits)), key_bits);
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if (ret < 0)
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continue;
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for (code = 0; code <= KEY_MAX; code++) {
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if (test_bit(code, key_bits))
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set_key_cb(code, 1, data);
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}
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}
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return 0;
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}
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