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diff --git a/ui.cpp b/ui.cpp
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+/*
+ * Copyright (C) 2011 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 <errno.h>
+#include <fcntl.h>
+#include <linux/input.h>
+#include <pthread.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <time.h>
+#include <unistd.h>
+
+#include <cutils/android_reboot.h>
+
+#include "common.h"
+#include "device.h"
+#include "minui/minui.h"
+#include "screen_ui.h"
+#include "ui.h"
+
+#define UI_WAIT_KEY_TIMEOUT_SEC 120
+
+// There's only (at most) one of these objects, and global callbacks
+// (for pthread_create, and the input event system) need to find it,
+// so use a global variable.
+static RecoveryUI* self = NULL;
+
+RecoveryUI::RecoveryUI() :
+ key_queue_len(0),
+ key_last_down(-1) {
+ pthread_mutex_init(&key_queue_mutex, NULL);
+ pthread_cond_init(&key_queue_cond, NULL);
+ self = this;
+}
+
+void RecoveryUI::Init() {
+ ev_init(input_callback, NULL);
+ pthread_create(&input_t, NULL, input_thread, NULL);
+}
+
+
+int RecoveryUI::input_callback(int fd, short revents, void* data)
+{
+ struct input_event ev;
+ int ret;
+
+ ret = ev_get_input(fd, revents, &ev);
+ if (ret)
+ return -1;
+
+ if (ev.type == EV_SYN) {
+ return 0;
+ } else if (ev.type == EV_REL) {
+ if (ev.code == REL_Y) {
+ // accumulate the up or down motion reported by
+ // the trackball. When it exceeds a threshold
+ // (positive or negative), fake an up/down
+ // key event.
+ self->rel_sum += ev.value;
+ if (self->rel_sum > 3) {
+ self->process_key(KEY_DOWN, 1); // press down key
+ self->process_key(KEY_DOWN, 0); // and release it
+ self->rel_sum = 0;
+ } else if (self->rel_sum < -3) {
+ self->process_key(KEY_UP, 1); // press up key
+ self->process_key(KEY_UP, 0); // and release it
+ self->rel_sum = 0;
+ }
+ }
+ } else {
+ self->rel_sum = 0;
+ }
+
+ if (ev.type == EV_KEY && ev.code <= KEY_MAX)
+ self->process_key(ev.code, ev.value);
+
+ return 0;
+}
+
+// Process a key-up or -down event. A key is "registered" when it is
+// pressed and then released, with no other keypresses or releases in
+// between. Registered keys are passed to CheckKey() to see if it
+// should trigger a visibility toggle, an immediate reboot, or be
+// queued to be processed next time the foreground thread wants a key
+// (eg, for the menu).
+//
+// We also keep track of which keys are currently down so that
+// CheckKey can call IsKeyPressed to see what other keys are held when
+// a key is registered.
+//
+// updown == 1 for key down events; 0 for key up events
+void RecoveryUI::process_key(int key_code, int updown) {
+ bool register_key = false;
+
+ pthread_mutex_lock(&key_queue_mutex);
+ key_pressed[key_code] = updown;
+ if (updown) {
+ key_last_down = key_code;
+ } else {
+ if (key_last_down == key_code)
+ register_key = true;
+ key_last_down = -1;
+ }
+ pthread_mutex_unlock(&key_queue_mutex);
+
+ if (register_key) {
+ switch (CheckKey(key_code)) {
+ case RecoveryUI::TOGGLE:
+ ShowText(!IsTextVisible());
+ break;
+
+ case RecoveryUI::REBOOT:
+ android_reboot(ANDROID_RB_RESTART, 0, 0);
+ break;
+
+ case RecoveryUI::ENQUEUE:
+ pthread_mutex_lock(&key_queue_mutex);
+ const int queue_max = sizeof(key_queue) / sizeof(key_queue[0]);
+ if (key_queue_len < queue_max) {
+ key_queue[key_queue_len++] = key_code;
+ pthread_cond_signal(&key_queue_cond);
+ }
+ pthread_mutex_unlock(&key_queue_mutex);
+ break;
+ }
+ }
+}
+
+// Reads input events, handles special hot keys, and adds to the key queue.
+void* RecoveryUI::input_thread(void *cookie)
+{
+ for (;;) {
+ if (!ev_wait(-1))
+ ev_dispatch();
+ }
+ return NULL;
+}
+
+int RecoveryUI::WaitKey()
+{
+ pthread_mutex_lock(&key_queue_mutex);
+
+ // Time out after UI_WAIT_KEY_TIMEOUT_SEC, unless a USB cable is
+ // plugged in.
+ do {
+ struct timeval now;
+ struct timespec timeout;
+ gettimeofday(&now, NULL);
+ timeout.tv_sec = now.tv_sec;
+ timeout.tv_nsec = now.tv_usec * 1000;
+ timeout.tv_sec += UI_WAIT_KEY_TIMEOUT_SEC;
+
+ int rc = 0;
+ while (key_queue_len == 0 && rc != ETIMEDOUT) {
+ rc = pthread_cond_timedwait(&key_queue_cond, &key_queue_mutex,
+ &timeout);
+ }
+ } while (usb_connected() && key_queue_len == 0);
+
+ int key = -1;
+ if (key_queue_len > 0) {
+ key = key_queue[0];
+ memcpy(&key_queue[0], &key_queue[1], sizeof(int) * --key_queue_len);
+ }
+ pthread_mutex_unlock(&key_queue_mutex);
+ return key;
+}
+
+// Return true if USB is connected.
+bool RecoveryUI::usb_connected() {
+ int fd = open("/sys/class/android_usb/android0/state", O_RDONLY);
+ if (fd < 0) {
+ printf("failed to open /sys/class/android_usb/android0/state: %s\n",
+ strerror(errno));
+ return 0;
+ }
+
+ char buf;
+ /* USB is connected if android_usb state is CONNECTED or CONFIGURED */
+ int connected = (read(fd, &buf, 1) == 1) && (buf == 'C');
+ if (close(fd) < 0) {
+ printf("failed to close /sys/class/android_usb/android0/state: %s\n",
+ strerror(errno));
+ }
+ return connected;
+}
+
+bool RecoveryUI::IsKeyPressed(int key)
+{
+ pthread_mutex_lock(&key_queue_mutex);
+ int pressed = key_pressed[key];
+ pthread_mutex_unlock(&key_queue_mutex);
+ return pressed;
+}
+
+void RecoveryUI::FlushKeys() {
+ pthread_mutex_lock(&key_queue_mutex);
+ key_queue_len = 0;
+ pthread_mutex_unlock(&key_queue_mutex);
+}
+
+RecoveryUI::KeyAction RecoveryUI::CheckKey(int key) {
+ return RecoveryUI::ENQUEUE;
+}