1 files changed, 231 insertions, 0 deletions

diff --git a/minui/events.cpp b/minui/events.cpp
new file mode 100644
index 000000000..2c41eb8a7
--- /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);
+            }
+        }
+    }
+}