339 lines
9.9 KiB
C++
339 lines
9.9 KiB
C++
/*
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* Copyright (C) 2011 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 <errno.h>
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#include <fcntl.h>
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#include <linux/input.h>
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#include <pthread.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <time.h>
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#include <unistd.h>
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#include <cutils/properties.h>
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#include <cutils/android_reboot.h>
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#include "common.h"
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#include "roots.h"
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#include "device.h"
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#include "minui/minui.h"
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#include "screen_ui.h"
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#include "ui.h"
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#define UI_WAIT_KEY_TIMEOUT_SEC 120
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RecoveryUI::RecoveryUI()
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: key_queue_len(0),
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key_last_down(-1),
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key_long_press(false),
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key_down_count(0),
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enable_reboot(true),
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consecutive_power_keys(0),
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last_key(-1),
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has_power_key(false),
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has_up_key(false),
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has_down_key(false) {
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pthread_mutex_init(&key_queue_mutex, nullptr);
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pthread_cond_init(&key_queue_cond, nullptr);
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memset(key_pressed, 0, sizeof(key_pressed));
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}
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void RecoveryUI::OnKeyDetected(int key_code) {
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if (key_code == KEY_POWER) {
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has_power_key = true;
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} else if (key_code == KEY_DOWN || key_code == KEY_VOLUMEDOWN) {
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has_down_key = true;
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} else if (key_code == KEY_UP || key_code == KEY_VOLUMEUP) {
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has_up_key = true;
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}
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}
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int RecoveryUI::InputCallback(int fd, uint32_t epevents, void* data) {
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return reinterpret_cast<RecoveryUI*>(data)->OnInputEvent(fd, epevents);
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}
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// Reads input events, handles special hot keys, and adds to the key queue.
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static void* InputThreadLoop(void*) {
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while (true) {
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if (!ev_wait(-1)) {
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ev_dispatch();
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}
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}
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return nullptr;
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}
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void RecoveryUI::Init() {
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ev_init(InputCallback, this);
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ev_iterate_available_keys(std::bind(&RecoveryUI::OnKeyDetected, this, std::placeholders::_1));
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pthread_create(&input_thread_, nullptr, InputThreadLoop, nullptr);
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}
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int RecoveryUI::OnInputEvent(int fd, uint32_t epevents) {
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struct input_event ev;
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if (ev_get_input(fd, epevents, &ev) == -1) {
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return -1;
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}
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if (ev.type == EV_SYN) {
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return 0;
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} else if (ev.type == EV_REL) {
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if (ev.code == REL_Y) {
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// accumulate the up or down motion reported by
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// the trackball. When it exceeds a threshold
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// (positive or negative), fake an up/down
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// key event.
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rel_sum += ev.value;
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if (rel_sum > 3) {
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ProcessKey(KEY_DOWN, 1); // press down key
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ProcessKey(KEY_DOWN, 0); // and release it
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rel_sum = 0;
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} else if (rel_sum < -3) {
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ProcessKey(KEY_UP, 1); // press up key
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ProcessKey(KEY_UP, 0); // and release it
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rel_sum = 0;
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}
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}
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} else {
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rel_sum = 0;
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}
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if (ev.type == EV_KEY && ev.code <= KEY_MAX) {
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ProcessKey(ev.code, ev.value);
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}
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return 0;
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}
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// Process a key-up or -down event. A key is "registered" when it is
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// pressed and then released, with no other keypresses or releases in
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// between. Registered keys are passed to CheckKey() to see if it
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// should trigger a visibility toggle, an immediate reboot, or be
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// queued to be processed next time the foreground thread wants a key
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// (eg, for the menu).
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//
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// We also keep track of which keys are currently down so that
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// CheckKey can call IsKeyPressed to see what other keys are held when
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// a key is registered.
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//
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// updown == 1 for key down events; 0 for key up events
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void RecoveryUI::ProcessKey(int key_code, int updown) {
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bool register_key = false;
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bool long_press = false;
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bool reboot_enabled;
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pthread_mutex_lock(&key_queue_mutex);
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key_pressed[key_code] = updown;
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if (updown) {
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++key_down_count;
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key_last_down = key_code;
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key_long_press = false;
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key_timer_t* info = new key_timer_t;
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info->ui = this;
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info->key_code = key_code;
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info->count = key_down_count;
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pthread_t thread;
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pthread_create(&thread, nullptr, &RecoveryUI::time_key_helper, info);
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pthread_detach(thread);
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} else {
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if (key_last_down == key_code) {
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long_press = key_long_press;
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register_key = true;
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}
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key_last_down = -1;
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}
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reboot_enabled = enable_reboot;
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pthread_mutex_unlock(&key_queue_mutex);
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if (register_key) {
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switch (CheckKey(key_code, long_press)) {
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case RecoveryUI::IGNORE:
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break;
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case RecoveryUI::TOGGLE:
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ShowText(!IsTextVisible());
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break;
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case RecoveryUI::REBOOT:
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if (reboot_enabled) {
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property_set(ANDROID_RB_PROPERTY, "reboot,");
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while (true) { pause(); }
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}
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break;
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case RecoveryUI::ENQUEUE:
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EnqueueKey(key_code);
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break;
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}
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}
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}
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void* RecoveryUI::time_key_helper(void* cookie) {
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key_timer_t* info = (key_timer_t*) cookie;
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info->ui->time_key(info->key_code, info->count);
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delete info;
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return nullptr;
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}
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void RecoveryUI::time_key(int key_code, int count) {
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usleep(750000); // 750 ms == "long"
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bool long_press = false;
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pthread_mutex_lock(&key_queue_mutex);
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if (key_last_down == key_code && key_down_count == count) {
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long_press = key_long_press = true;
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}
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pthread_mutex_unlock(&key_queue_mutex);
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if (long_press) KeyLongPress(key_code);
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}
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void RecoveryUI::EnqueueKey(int key_code) {
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pthread_mutex_lock(&key_queue_mutex);
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const int queue_max = sizeof(key_queue) / sizeof(key_queue[0]);
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if (key_queue_len < queue_max) {
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key_queue[key_queue_len++] = key_code;
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pthread_cond_signal(&key_queue_cond);
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}
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pthread_mutex_unlock(&key_queue_mutex);
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}
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int RecoveryUI::WaitKey() {
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pthread_mutex_lock(&key_queue_mutex);
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// Time out after UI_WAIT_KEY_TIMEOUT_SEC, unless a USB cable is
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// plugged in.
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do {
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struct timeval now;
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struct timespec timeout;
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gettimeofday(&now, nullptr);
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timeout.tv_sec = now.tv_sec;
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timeout.tv_nsec = now.tv_usec * 1000;
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timeout.tv_sec += UI_WAIT_KEY_TIMEOUT_SEC;
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int rc = 0;
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while (key_queue_len == 0 && rc != ETIMEDOUT) {
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rc = pthread_cond_timedwait(&key_queue_cond, &key_queue_mutex, &timeout);
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}
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} while (IsUsbConnected() && key_queue_len == 0);
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int key = -1;
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if (key_queue_len > 0) {
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key = key_queue[0];
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memcpy(&key_queue[0], &key_queue[1], sizeof(int) * --key_queue_len);
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}
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pthread_mutex_unlock(&key_queue_mutex);
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return key;
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}
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bool RecoveryUI::IsUsbConnected() {
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int fd = open("/sys/class/android_usb/android0/state", O_RDONLY);
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if (fd < 0) {
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printf("failed to open /sys/class/android_usb/android0/state: %s\n",
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strerror(errno));
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return 0;
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}
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char buf;
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// USB is connected if android_usb state is CONNECTED or CONFIGURED.
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int connected = (TEMP_FAILURE_RETRY(read(fd, &buf, 1)) == 1) && (buf == 'C');
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if (close(fd) < 0) {
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printf("failed to close /sys/class/android_usb/android0/state: %s\n",
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strerror(errno));
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}
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return connected;
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}
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bool RecoveryUI::IsKeyPressed(int key) {
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pthread_mutex_lock(&key_queue_mutex);
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int pressed = key_pressed[key];
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pthread_mutex_unlock(&key_queue_mutex);
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return pressed;
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}
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bool RecoveryUI::IsLongPress() {
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pthread_mutex_lock(&key_queue_mutex);
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bool result = key_long_press;
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pthread_mutex_unlock(&key_queue_mutex);
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return result;
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}
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bool RecoveryUI::HasThreeButtons() {
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return has_power_key && has_up_key && has_down_key;
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}
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void RecoveryUI::FlushKeys() {
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pthread_mutex_lock(&key_queue_mutex);
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key_queue_len = 0;
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pthread_mutex_unlock(&key_queue_mutex);
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}
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RecoveryUI::KeyAction RecoveryUI::CheckKey(int key, bool is_long_press) {
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pthread_mutex_lock(&key_queue_mutex);
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key_long_press = false;
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pthread_mutex_unlock(&key_queue_mutex);
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// If we have power and volume up keys, that chord is the signal to toggle the text display.
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if (HasThreeButtons()) {
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if (key == KEY_VOLUMEUP && IsKeyPressed(KEY_POWER)) {
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return TOGGLE;
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}
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} else {
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// Otherwise long press of any button toggles to the text display,
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// and there's no way to toggle back (but that's pretty useless anyway).
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if (is_long_press && !IsTextVisible()) {
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return TOGGLE;
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}
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// Also, for button-limited devices, a long press is translated to KEY_ENTER.
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if (is_long_press && IsTextVisible()) {
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EnqueueKey(KEY_ENTER);
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return IGNORE;
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}
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}
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// Press power seven times in a row to reboot.
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if (key == KEY_POWER) {
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pthread_mutex_lock(&key_queue_mutex);
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bool reboot_enabled = enable_reboot;
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pthread_mutex_unlock(&key_queue_mutex);
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if (reboot_enabled) {
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++consecutive_power_keys;
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if (consecutive_power_keys >= 7) {
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return REBOOT;
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}
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}
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} else {
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consecutive_power_keys = 0;
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}
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last_key = key;
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return IsTextVisible() ? ENQUEUE : IGNORE;
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}
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void RecoveryUI::KeyLongPress(int) {
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}
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void RecoveryUI::SetEnableReboot(bool enabled) {
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pthread_mutex_lock(&key_queue_mutex);
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enable_reboot = enabled;
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pthread_mutex_unlock(&key_queue_mutex);
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}
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