Add ev_iterate_available_keys to minui.
This lets us recognize whether we have up/down/power, say, and tailor
the UI accordingly.
Change-Id: If94e454f14243b59d2f473ac9a436bd60591da01
diff --git a/minui/events.cpp b/minui/events.cpp
new file mode 100644
index 0000000..2c41eb8
--- /dev/null
+++ b/minui/events.cpp
@@ -0,0 +1,231 @@
+/*
+ * 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 <dirent.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/epoll.h>
+#include <unistd.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)
+
+struct fd_info {
+ int fd;
+ ev_callback cb;
+ void* data;
+};
+
+static int g_epoll_fd;
+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;
+
+static bool test_bit(size_t bit, unsigned long* array) {
+ return (array[bit/BITS_PER_LONG] & (1UL << (bit % BITS_PER_LONG))) != 0;
+}
+
+int ev_init(ev_callback input_cb, void* data) {
+ bool epollctlfail = false;
+
+ g_epoll_fd = epoll_create(MAX_DEVICES + MAX_MISC_FDS);
+ if (g_epoll_fd == -1) {
+ return -1;
+ }
+
+ DIR* dir = opendir("/dev/input");
+ if (dir != NULL) {
+ struct dirent* de;
+ 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;
+ int fd = openat(dirfd(dir), de->d_name, O_RDONLY);
+ if (fd == -1) continue;
+
+ // Read the evbits of the input device.
+ if (ioctl(fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
+ close(fd);
+ continue;
+ }
+
+ // We assume that only EV_KEY, EV_REL, and EV_SW event types are ever needed.
+ if (!test_bit(EV_KEY, ev_bits) && !test_bit(EV_REL, ev_bits) && !test_bit(EV_SW, ev_bits)) {
+ close(fd);
+ continue;
+ }
+
+ struct epoll_event ev;
+ ev.events = EPOLLIN | EPOLLWAKEUP;
+ ev.data.ptr = &ev_fdinfo[ev_count];
+ if (epoll_ctl(g_epoll_fd, EPOLL_CTL_ADD, fd, &ev) == -1) {
+ 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;
+ }
+
+ closedir(dir);
+ }
+
+ if (epollctlfail && !ev_count) {
+ close(g_epoll_fd);
+ g_epoll_fd = -1;
+ return -1;
+ }
+
+ return 0;
+}
+
+int ev_get_epollfd(void) {
+ return g_epoll_fd;
+}
+
+int ev_add_fd(int fd, ev_callback cb, void* data) {
+ if (ev_misc_count == MAX_MISC_FDS || cb == NULL) {
+ return -1;
+ }
+
+ struct epoll_event ev;
+ ev.events = EPOLLIN | EPOLLWAKEUP;
+ ev.data.ptr = (void *)&ev_fdinfo[ev_count];
+ int ret = epoll_ctl(g_epoll_fd, 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;
+}
+
+void ev_exit(void) {
+ while (ev_count > 0) {
+ close(ev_fdinfo[--ev_count].fd);
+ }
+ ev_misc_count = 0;
+ ev_dev_count = 0;
+ close(g_epoll_fd);
+}
+
+int ev_wait(int timeout) {
+ npolledevents = epoll_wait(g_epoll_fd, polledevents, ev_count, timeout);
+ if (npolledevents <= 0) {
+ return -1;
+ }
+ return 0;
+}
+
+void ev_dispatch(void) {
+ for (int n = 0; n < npolledevents; n++) {
+ fd_info* fdi = reinterpret_cast<fd_info*>(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) {
+ if (epevents & EPOLLIN) {
+ ssize_t 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 ev_bits[BITS_TO_LONGS(EV_MAX)];
+ unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)];
+
+ for (size_t i = 0; i < ev_dev_count; ++i) {
+ memset(ev_bits, 0, sizeof(ev_bits));
+ memset(key_bits, 0, sizeof(key_bits));
+
+ if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
+ continue;
+ }
+ if (!test_bit(EV_KEY, ev_bits)) {
+ continue;
+ }
+ if (ioctl(ev_fdinfo[i].fd, EVIOCGKEY(sizeof(key_bits)), key_bits) == -1) {
+ continue;
+ }
+
+ for (int code = 0; code <= KEY_MAX; code++) {
+ if (test_bit(code, key_bits)) {
+ set_key_cb(code, 1, data);
+ }
+ }
+ }
+
+ return 0;
+}
+
+void ev_iterate_available_keys(ev_key_callback cb, void* data) {
+ unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)];
+ unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)];
+
+ for (size_t i = 0; i < ev_dev_count; ++i) {
+ memset(ev_bits, 0, sizeof(ev_bits));
+ memset(key_bits, 0, sizeof(key_bits));
+
+ // Does this device even have keys?
+ if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
+ continue;
+ }
+ if (!test_bit(EV_KEY, ev_bits)) {
+ continue;
+ }
+
+ int rc = ioctl(ev_fdinfo[i].fd, EVIOCGBIT(EV_KEY, KEY_MAX), key_bits);
+ if (rc == -1) {
+ continue;
+ }
+
+ for (int key_code = 0; key_code <= KEY_MAX; ++key_code) {
+ if (test_bit(key_code, key_bits)) {
+ cb(key_code, data);
+ }
+ }
+ }
+}