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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 "ui.h"
#include <errno.h>
#include <fcntl.h>
#include <linux/input.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include <chrono>
#include <functional>
#include <string>
#include <thread>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/parseint.h>
#include <android-base/strings.h>
#include "minui/minui.h"
#include "otautil/sysutil.h"
#include "roots.h"
using namespace std::chrono_literals;
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";
static constexpr const char* BRIGHTNESS_FILE_SDM =
"/sys/class/backlight/panel0-backlight/brightness";
static constexpr const char* MAX_BRIGHTNESS_FILE_SDM =
"/sys/class/backlight/panel0-backlight/max_brightness";
RecoveryUI::RecoveryUI()
: brightness_normal_(50),
brightness_dimmed_(25),
brightness_file_(BRIGHTNESS_FILE),
max_brightness_file_(MAX_BRIGHTNESS_FILE),
touch_screen_allowed_(false),
kTouchLowThreshold(RECOVERY_UI_TOUCH_LOW_THRESHOLD),
kTouchHighThreshold(RECOVERY_UI_TOUCH_HIGH_THRESHOLD),
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),
has_touch_screen(false),
touch_slot_(0),
is_bootreason_recovery_ui_(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));
}
RecoveryUI::~RecoveryUI() {
ev_exit();
input_thread_stopped_ = true;
input_thread_.join();
}
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;
} else if (key_code == ABS_MT_POSITION_X || key_code == ABS_MT_POSITION_Y) {
has_touch_screen = true;
}
}
bool RecoveryUI::InitScreensaver() {
// Disabled.
if (brightness_normal_ == 0 || brightness_dimmed_ > brightness_normal_) {
return false;
}
if (access(brightness_file_.c_str(), R_OK | W_OK)) {
brightness_file_ = BRIGHTNESS_FILE_SDM;
}
if (access(max_brightness_file_.c_str(), R_OK)) {
max_brightness_file_ = MAX_BRIGHTNESS_FILE_SDM;
}
// 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)) {
PLOG(WARNING) << "Failed to read max brightness";
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 */) {
ev_init(std::bind(&RecoveryUI::OnInputEvent, this, std::placeholders::_1, std::placeholders::_2),
touch_screen_allowed_);
ev_iterate_available_keys(std::bind(&RecoveryUI::OnKeyDetected, this, std::placeholders::_1));
if (touch_screen_allowed_) {
ev_iterate_touch_inputs(std::bind(&RecoveryUI::OnKeyDetected, this, std::placeholders::_1));
// Parse /proc/cmdline to determine if it's booting into recovery with a bootreason of
// "recovery_ui". This specific reason is set by some (wear) bootloaders, to allow an easier way
// to turn on text mode. It will only be set if the recovery boot is triggered from fastboot, or
// with 'adb reboot recovery'. Note that this applies to all build variants. Otherwise the text
// mode will be turned on automatically on debuggable builds, even without a swipe.
std::string cmdline;
if (android::base::ReadFileToString("/proc/cmdline", &cmdline)) {
is_bootreason_recovery_ui_ = cmdline.find("bootreason=recovery_ui") != std::string::npos;
} else {
// Non-fatal, and won't affect Init() result.
PLOG(WARNING) << "Failed to read /proc/cmdline";
}
}
if (!InitScreensaver()) {
LOG(INFO) << "Screensaver disabled";
}
// Create a separate thread that handles input events.
input_thread_ = std::thread([this]() {
while (!this->input_thread_stopped_) {
if (!ev_wait(500)) {
ev_dispatch();
}
}
});
return true;
}
void RecoveryUI::OnTouchDetected(int dx, int dy) {
enum SwipeDirection { UP, DOWN, RIGHT, LEFT } direction;
// We only consider a valid swipe if:
// - the delta along one axis is below kTouchLowThreshold;
// - and the delta along the other axis is beyond kTouchHighThreshold.
if (abs(dy) < kTouchLowThreshold && abs(dx) > kTouchHighThreshold) {
direction = dx < 0 ? SwipeDirection::LEFT : SwipeDirection::RIGHT;
} else if (abs(dx) < kTouchLowThreshold && abs(dy) > kTouchHighThreshold) {
direction = dy < 0 ? SwipeDirection::UP : SwipeDirection::DOWN;
} else {
LOG(DEBUG) << "Ignored " << dx << " " << dy << " (low: " << kTouchLowThreshold
<< ", high: " << kTouchHighThreshold << ")";
return;
}
// Allow turning on text mode with any swipe, if bootloader has set a bootreason of recovery_ui.
if (is_bootreason_recovery_ui_ && !IsTextVisible()) {
ShowText(true);
return;
}
LOG(DEBUG) << "Swipe direction=" << direction;
switch (direction) {
case SwipeDirection::UP:
ProcessKey(KEY_UP, 1); // press up key
ProcessKey(KEY_UP, 0); // and release it
break;
case SwipeDirection::DOWN:
ProcessKey(KEY_DOWN, 1); // press down key
ProcessKey(KEY_DOWN, 0); // and release it
break;
case SwipeDirection::LEFT:
case SwipeDirection::RIGHT:
ProcessKey(KEY_POWER, 1); // press power key
ProcessKey(KEY_POWER, 0); // and release it
break;
};
}
int RecoveryUI::OnInputEvent(int fd, uint32_t epevents) {
struct input_event ev;
if (ev_get_input(fd, epevents, &ev) == -1) {
return -1;
}
// Touch inputs handling.
//
// We handle the touch inputs by tracking the position changes between initial contacting and
// upon lifting. touch_start_X/Y record the initial positions, with touch_finger_down set. Upon
// detecting the lift, we unset touch_finger_down and detect a swipe based on position changes.
//
// Per the doc Multi-touch Protocol at below, there are two protocols.
// https://www.kernel.org/doc/Documentation/input/multi-touch-protocol.txt
//
// The main difference between the stateless type A protocol and the stateful type B slot protocol
// lies in the usage of identifiable contacts to reduce the amount of data sent to userspace. The
// slot protocol (i.e. type B) sends ABS_MT_TRACKING_ID with a unique id on initial contact, and
// sends ABS_MT_TRACKING_ID -1 upon lifting the contact. Protocol A doesn't send
// ABS_MT_TRACKING_ID -1 on lifting, but the driver may additionally report BTN_TOUCH event.
//
// For protocol A, we rely on BTN_TOUCH to recognize lifting, while for protocol B we look for
// ABS_MT_TRACKING_ID being -1.
//
// Touch input events will only be available if touch_screen_allowed_ is set.
if (ev.type == EV_SYN) {
if (touch_screen_allowed_ && ev.code == SYN_REPORT) {
// There might be multiple SYN_REPORT events. We should only detect a swipe after lifting the
// contact.
if (touch_finger_down_ && !touch_swiping_) {
touch_start_X_ = touch_X_;
touch_start_Y_ = touch_Y_;
touch_swiping_ = true;
} else if (!touch_finger_down_ && touch_swiping_) {
touch_swiping_ = false;
OnTouchDetected(touch_X_ - touch_start_X_, touch_Y_ - touch_start_Y_);
}
}
return 0;
}
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 (touch_screen_allowed_ && ev.type == EV_ABS) {
if (ev.code == ABS_MT_SLOT) {
touch_slot_ = ev.value;
}
// Ignore other fingers.
if (touch_slot_ > 0) return 0;
switch (ev.code) {
case ABS_MT_POSITION_X:
touch_X_ = ev.value;
touch_finger_down_ = true;
break;
case ABS_MT_POSITION_Y:
touch_Y_ = ev.value;
touch_finger_down_ = true;
break;
case ABS_MT_TRACKING_ID:
// Protocol B: -1 marks lifting the contact.
if (ev.value < 0) touch_finger_down_ = false;
break;
}
return 0;
}
if (ev.type == EV_KEY && ev.code <= KEY_MAX) {
if (touch_screen_allowed_) {
if (ev.code == BTN_TOUCH) {
// A BTN_TOUCH with value 1 indicates the start of contact (protocol A), with 0 means
// lifting the contact.
touch_finger_down_ = (ev.value == 1);
}
// Intentionally ignore BTN_TOUCH and BTN_TOOL_FINGER, which would otherwise trigger
// additional scrolling (because in ScreenRecoveryUI::ShowFile(), we consider keys other than
// KEY_POWER and KEY_UP as KEY_DOWN).
if (ev.code == BTN_TOUCH || ev.code == BTN_TOOL_FINGER) {
return 0;
}
}
ProcessKey(ev.code, ev.value);
}
return 0;
}
// Processes 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;
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;
std::thread time_key_thread(&RecoveryUI::TimeKey, this, key_code, key_down_count);
time_key_thread.detach();
} else {
if (key_last_down == key_code) {
long_press = key_long_press;
register_key = true;
}
key_last_down = -1;
}
bool 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) {
reboot("reboot,");
while (true) {
pause();
}
}
break;
case RecoveryUI::ENQUEUE:
EnqueueKey(key_code);
break;
}
}
}
void RecoveryUI::TimeKey(int key_code, int count) {
std::this_thread::sleep_for(750ms); // 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;
}
bool RecoveryUI::HasPowerKey() const {
return has_power_key;
}
bool RecoveryUI::HasTouchScreen() const {
return has_touch_screen;
}
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() || (HasPowerKey() && HasTouchScreen() && touch_screen_allowed_)) {
if ((key == KEY_VOLUMEUP || key == KEY_UP) && 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);
}