diff options
Diffstat (limited to 'minui21/events.c')
| -rw-r--r-- | minui21/events.c | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/minui21/events.c b/minui21/events.c new file mode 100644 index 000000000..b8cf15ab4 --- /dev/null +++ b/minui21/events.c @@ -0,0 +1,219 @@ +/* + * 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; + } + +#ifdef EPOLLWAKEUP + ev.events = EPOLLIN | EPOLLWAKEUP; +#else + ev.events = EPOLLIN; +#endif + 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; + +#ifdef EPOLLWAKEUP + ev.events = EPOLLIN | EPOLLWAKEUP; +#else + ev.events = EPOLLIN; +#endif + 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; +} |