/*
* 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 "ui.h"
#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 <string>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/parseint.h>
#include <android-base/properties.h>
#include <android-base/strings.h>
#include <cutils/android_reboot.h>
#include <minui/minui.h>
#include "common.h"
#include "roots.h"
#include "device.h"
static constexpr int UI_WAIT_KEY_TIMEOUT_SEC = 120;
static constexpr const char* BRIGHTNESS_FILE = "/sys/class/leds/lcd-backlight/brightness";
static constexpr const char* MAX_BRIGHTNESS_FILE = "/sys/class/leds/lcd-backlight/max_brightness";
RecoveryUI::RecoveryUI()
: locale_(""),
rtl_locale_(false),
brightness_normal_(50),
brightness_dimmed_(25),
key_queue_len(0),
key_last_down(-1),
key_long_press(false),
key_down_count(0),
enable_reboot(true),
consecutive_power_keys(0),
last_key(-1),
has_power_key(false),
has_up_key(false),
has_down_key(false),
screensaver_state_(ScreensaverState::DISABLED) {
pthread_mutex_init(&key_queue_mutex, nullptr);
pthread_cond_init(&key_queue_cond, nullptr);
memset(key_pressed, 0, sizeof(key_pressed));
}
void RecoveryUI::OnKeyDetected(int key_code) {
if (key_code == KEY_POWER) {
has_power_key = true;
} else if (key_code == KEY_DOWN || key_code == KEY_VOLUMEDOWN) {
has_down_key = true;
} else if (key_code == KEY_UP || key_code == KEY_VOLUMEUP) {
has_up_key = true;
}
}
// Reads input events, handles special hot keys, and adds to the key queue.
static void* InputThreadLoop(void*) {
while (true) {
if (!ev_wait(-1)) {
ev_dispatch();
}
}
return nullptr;
}
bool RecoveryUI::InitScreensaver() {
// Disabled.
if (brightness_normal_ == 0 || brightness_dimmed_ > brightness_normal_) {
return false;
}
// Set the initial brightness level based on the max brightness. Note that reading the initial
// value from BRIGHTNESS_FILE doesn't give the actual brightness value (bullhead, sailfish), so
// we don't have a good way to query the default value.
std::string content;
if (!android::base::ReadFileToString(MAX_BRIGHTNESS_FILE, &content)) {
LOG(WARNING) << "Failed to read max brightness: " << content;
return false;
}
unsigned int max_value;
if (!android::base::ParseUint(android::base::Trim(content), &max_value)) {
LOG(WARNING) << "Failed to parse max brightness: " << content;
return false;
}
brightness_normal_value_ = max_value * brightness_normal_ / 100.0;
brightness_dimmed_value_ = max_value * brightness_dimmed_ / 100.0;
if (!android::base::WriteStringToFile(std::to_string(brightness_normal_value_),
BRIGHTNESS_FILE)) {
PLOG(WARNING) << "Failed to set brightness";
return false;
}
LOG(INFO) << "Brightness: " << brightness_normal_value_ << " (" << brightness_normal_ << "%)";
screensaver_state_ = ScreensaverState::NORMAL;
return true;
}
bool RecoveryUI::Init(const std::string& locale) {
// Set up the locale info.
SetLocale(locale);
ev_init(std::bind(&RecoveryUI::OnInputEvent, this, std::placeholders::_1, std::placeholders::_2));
ev_iterate_available_keys(std::bind(&RecoveryUI::OnKeyDetected, this, std::placeholders::_1));
if (!InitScreensaver()) {
LOG(INFO) << "Screensaver disabled";
}
pthread_create(&input_thread_, nullptr, InputThreadLoop, nullptr);
return true;
}
int RecoveryUI::OnInputEvent(int fd, uint32_t epevents) {
struct input_event ev;
if (ev_get_input(fd, epevents, &ev) == -1) {
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.
rel_sum += ev.value;
if (rel_sum > 3) {
ProcessKey(KEY_DOWN, 1); // press down key
ProcessKey(KEY_DOWN, 0); // and release it
rel_sum = 0;
} else if (rel_sum < -3) {
ProcessKey(KEY_UP, 1); // press up key
ProcessKey(KEY_UP, 0); // and release it
rel_sum = 0;
}
}
} else {
rel_sum = 0;
}
if (ev.type == EV_KEY && ev.code <= KEY_MAX) {
ProcessKey(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::ProcessKey(int key_code, int updown) {
bool register_key = false;
bool long_press = false;
bool reboot_enabled;
pthread_mutex_lock(&key_queue_mutex);
key_pressed[key_code] = updown;
if (updown) {
++key_down_count;
key_last_down = key_code;
key_long_press = false;
key_timer_t* info = new key_timer_t;
info->ui = this;
info->key_code = key_code;
info->count = key_down_count;
pthread_t thread;
pthread_create(&thread, nullptr, &RecoveryUI::time_key_helper, info);
pthread_detach(thread);
} else {
if (key_last_down == key_code) {
long_press = key_long_press;
register_key = true;
}
key_last_down = -1;
}
reboot_enabled = enable_reboot;
pthread_mutex_unlock(&key_queue_mutex);
if (register_key) {
switch (CheckKey(key_code, long_press)) {
case RecoveryUI::IGNORE:
break;
case RecoveryUI::TOGGLE:
ShowText(!IsTextVisible());
break;
case RecoveryUI::REBOOT:
if (reboot_enabled) {
android::base::SetProperty(ANDROID_RB_PROPERTY, "reboot,");
while (true) { pause(); }
}
break;
case RecoveryUI::ENQUEUE:
EnqueueKey(key_code);
break;
}
}
}
void* RecoveryUI::time_key_helper(void* cookie) {
key_timer_t* info = (key_timer_t*) cookie;
info->ui->time_key(info->key_code, info->count);
delete info;
return nullptr;
}
void RecoveryUI::time_key(int key_code, int count) {
usleep(750000); // 750 ms == "long"
bool long_press = false;
pthread_mutex_lock(&key_queue_mutex);
if (key_last_down == key_code && key_down_count == count) {
long_press = key_long_press = true;
}
pthread_mutex_unlock(&key_queue_mutex);
if (long_press) KeyLongPress(key_code);
}
void RecoveryUI::EnqueueKey(int key_code) {
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);
}
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, nullptr);
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);
}
if (screensaver_state_ != ScreensaverState::DISABLED) {
if (rc == ETIMEDOUT) {
// Lower the brightness level: NORMAL -> DIMMED; DIMMED -> OFF.
if (screensaver_state_ == ScreensaverState::NORMAL) {
if (android::base::WriteStringToFile(std::to_string(brightness_dimmed_value_),
BRIGHTNESS_FILE)) {
LOG(INFO) << "Brightness: " << brightness_dimmed_value_ << " (" << brightness_dimmed_
<< "%)";
screensaver_state_ = ScreensaverState::DIMMED;
}
} else if (screensaver_state_ == ScreensaverState::DIMMED) {
if (android::base::WriteStringToFile("0", BRIGHTNESS_FILE)) {
LOG(INFO) << "Brightness: 0 (off)";
screensaver_state_ = ScreensaverState::OFF;
}
}
} else if (screensaver_state_ != ScreensaverState::NORMAL) {
// Drop the first key if it's changing from OFF to NORMAL.
if (screensaver_state_ == ScreensaverState::OFF) {
if (key_queue_len > 0) {
memcpy(&key_queue[0], &key_queue[1], sizeof(int) * --key_queue_len);
}
}
// Reset the brightness to normal.
if (android::base::WriteStringToFile(std::to_string(brightness_normal_value_),
BRIGHTNESS_FILE)) {
screensaver_state_ = ScreensaverState::NORMAL;
LOG(INFO) << "Brightness: " << brightness_normal_value_ << " (" << brightness_normal_
<< "%)";
}
}
}
} while (IsUsbConnected() && 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;
}
bool RecoveryUI::IsUsbConnected() {
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 = (TEMP_FAILURE_RETRY(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;
}
bool RecoveryUI::IsLongPress() {
pthread_mutex_lock(&key_queue_mutex);
bool result = key_long_press;
pthread_mutex_unlock(&key_queue_mutex);
return result;
}
bool RecoveryUI::HasThreeButtons() {
return has_power_key && has_up_key && has_down_key;
}
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, bool is_long_press) {
pthread_mutex_lock(&key_queue_mutex);
key_long_press = false;
pthread_mutex_unlock(&key_queue_mutex);
// If we have power and volume up keys, that chord is the signal to toggle the text display.
if (HasThreeButtons()) {
if (key == KEY_VOLUMEUP && IsKeyPressed(KEY_POWER)) {
return TOGGLE;
}
} else {
// Otherwise long press of any button toggles to the text display,
// and there's no way to toggle back (but that's pretty useless anyway).
if (is_long_press && !IsTextVisible()) {
return TOGGLE;
}
// Also, for button-limited devices, a long press is translated to KEY_ENTER.
if (is_long_press && IsTextVisible()) {
EnqueueKey(KEY_ENTER);
return IGNORE;
}
}
// Press power seven times in a row to reboot.
if (key == KEY_POWER) {
pthread_mutex_lock(&key_queue_mutex);
bool reboot_enabled = enable_reboot;
pthread_mutex_unlock(&key_queue_mutex);
if (reboot_enabled) {
++consecutive_power_keys;
if (consecutive_power_keys >= 7) {
return REBOOT;
}
}
} else {
consecutive_power_keys = 0;
}
last_key = key;
return (IsTextVisible() || screensaver_state_ == ScreensaverState::OFF) ? ENQUEUE : IGNORE;
}
void RecoveryUI::KeyLongPress(int) {
}
void RecoveryUI::SetEnableReboot(bool enabled) {
pthread_mutex_lock(&key_queue_mutex);
enable_reboot = enabled;
pthread_mutex_unlock(&key_queue_mutex);
}
void RecoveryUI::SetLocale(const std::string& new_locale) {
this->locale_ = new_locale;
this->rtl_locale_ = false;
if (!new_locale.empty()) {
size_t underscore = new_locale.find('_');
// lang has the language prefix prior to '_', or full string if '_' doesn't exist.
std::string lang = new_locale.substr(0, underscore);
// A bit cheesy: keep an explicit list of supported RTL languages.
if (lang == "ar" || // Arabic
lang == "fa" || // Persian (Farsi)
lang == "he" || // Hebrew (new language code)
lang == "iw" || // Hebrew (old language code)
lang == "ur") { // Urdu
rtl_locale_ = true;
}
}
}
