1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "ui.h" 18 19 #include <errno.h> 20 #include <fcntl.h> 21 #include <linux/input.h> 22 #include <pthread.h> 23 #include <stdarg.h> 24 #include <stdio.h> 25 #include <stdlib.h> 26 #include <string.h> 27 #include <sys/stat.h> 28 #include <sys/time.h> 29 #include <sys/types.h> 30 #include <time.h> 31 #include <unistd.h> 32 33 #include <functional> 34 #include <string> 35 36 #include <android-base/file.h> 37 #include <android-base/logging.h> 38 #include <android-base/parseint.h> 39 #include <android-base/properties.h> 40 #include <android-base/strings.h> 41 #include <cutils/android_reboot.h> 42 #include <minui/minui.h> 43 44 #include "common.h" 45 #include "roots.h" 46 #include "device.h" 47 48 static constexpr int UI_WAIT_KEY_TIMEOUT_SEC = 120; 49 static constexpr const char* BRIGHTNESS_FILE = "/sys/class/leds/lcd-backlight/brightness"; 50 static constexpr const char* MAX_BRIGHTNESS_FILE = "/sys/class/leds/lcd-backlight/max_brightness"; 51 52 RecoveryUI::RecoveryUI() 53 : locale_(""), 54 rtl_locale_(false), 55 brightness_normal_(50), 56 brightness_dimmed_(25), 57 key_queue_len(0), 58 key_last_down(-1), 59 key_long_press(false), 60 key_down_count(0), 61 enable_reboot(true), 62 consecutive_power_keys(0), 63 last_key(-1), 64 has_power_key(false), 65 has_up_key(false), 66 has_down_key(false), 67 screensaver_state_(ScreensaverState::DISABLED) { 68 pthread_mutex_init(&key_queue_mutex, nullptr); 69 pthread_cond_init(&key_queue_cond, nullptr); 70 memset(key_pressed, 0, sizeof(key_pressed)); 71 } 72 73 void RecoveryUI::OnKeyDetected(int key_code) { 74 if (key_code == KEY_POWER) { 75 has_power_key = true; 76 } else if (key_code == KEY_DOWN || key_code == KEY_VOLUMEDOWN) { 77 has_down_key = true; 78 } else if (key_code == KEY_UP || key_code == KEY_VOLUMEUP) { 79 has_up_key = true; 80 } 81 } 82 83 // Reads input events, handles special hot keys, and adds to the key queue. 84 static void* InputThreadLoop(void*) { 85 while (true) { 86 if (!ev_wait(-1)) { 87 ev_dispatch(); 88 } 89 } 90 return nullptr; 91 } 92 93 bool RecoveryUI::InitScreensaver() { 94 // Disabled. 95 if (brightness_normal_ == 0 || brightness_dimmed_ > brightness_normal_) { 96 return false; 97 } 98 99 // Set the initial brightness level based on the max brightness. Note that reading the initial 100 // value from BRIGHTNESS_FILE doesn't give the actual brightness value (bullhead, sailfish), so 101 // we don't have a good way to query the default value. 102 std::string content; 103 if (!android::base::ReadFileToString(MAX_BRIGHTNESS_FILE, &content)) { 104 PLOG(WARNING) << "Failed to read max brightness"; 105 return false; 106 } 107 108 unsigned int max_value; 109 if (!android::base::ParseUint(android::base::Trim(content), &max_value)) { 110 LOG(WARNING) << "Failed to parse max brightness: " << content; 111 return false; 112 } 113 114 brightness_normal_value_ = max_value * brightness_normal_ / 100.0; 115 brightness_dimmed_value_ = max_value * brightness_dimmed_ / 100.0; 116 if (!android::base::WriteStringToFile(std::to_string(brightness_normal_value_), 117 BRIGHTNESS_FILE)) { 118 PLOG(WARNING) << "Failed to set brightness"; 119 return false; 120 } 121 122 LOG(INFO) << "Brightness: " << brightness_normal_value_ << " (" << brightness_normal_ << "%)"; 123 screensaver_state_ = ScreensaverState::NORMAL; 124 return true; 125 } 126 127 bool RecoveryUI::Init(const std::string& locale) { 128 // Set up the locale info. 129 SetLocale(locale); 130 131 ev_init(std::bind(&RecoveryUI::OnInputEvent, this, std::placeholders::_1, std::placeholders::_2)); 132 133 ev_iterate_available_keys(std::bind(&RecoveryUI::OnKeyDetected, this, std::placeholders::_1)); 134 135 if (!InitScreensaver()) { 136 LOG(INFO) << "Screensaver disabled"; 137 } 138 139 pthread_create(&input_thread_, nullptr, InputThreadLoop, nullptr); 140 return true; 141 } 142 143 int RecoveryUI::OnInputEvent(int fd, uint32_t epevents) { 144 struct input_event ev; 145 if (ev_get_input(fd, epevents, &ev) == -1) { 146 return -1; 147 } 148 149 if (ev.type == EV_SYN) { 150 return 0; 151 } else if (ev.type == EV_REL) { 152 if (ev.code == REL_Y) { 153 // accumulate the up or down motion reported by 154 // the trackball. When it exceeds a threshold 155 // (positive or negative), fake an up/down 156 // key event. 157 rel_sum += ev.value; 158 if (rel_sum > 3) { 159 ProcessKey(KEY_DOWN, 1); // press down key 160 ProcessKey(KEY_DOWN, 0); // and release it 161 rel_sum = 0; 162 } else if (rel_sum < -3) { 163 ProcessKey(KEY_UP, 1); // press up key 164 ProcessKey(KEY_UP, 0); // and release it 165 rel_sum = 0; 166 } 167 } 168 } else { 169 rel_sum = 0; 170 } 171 172 if (ev.type == EV_KEY && ev.code <= KEY_MAX) { 173 ProcessKey(ev.code, ev.value); 174 } 175 176 return 0; 177 } 178 179 // Process a key-up or -down event. A key is "registered" when it is 180 // pressed and then released, with no other keypresses or releases in 181 // between. Registered keys are passed to CheckKey() to see if it 182 // should trigger a visibility toggle, an immediate reboot, or be 183 // queued to be processed next time the foreground thread wants a key 184 // (eg, for the menu). 185 // 186 // We also keep track of which keys are currently down so that 187 // CheckKey can call IsKeyPressed to see what other keys are held when 188 // a key is registered. 189 // 190 // updown == 1 for key down events; 0 for key up events 191 void RecoveryUI::ProcessKey(int key_code, int updown) { 192 bool register_key = false; 193 bool long_press = false; 194 bool reboot_enabled; 195 196 pthread_mutex_lock(&key_queue_mutex); 197 key_pressed[key_code] = updown; 198 if (updown) { 199 ++key_down_count; 200 key_last_down = key_code; 201 key_long_press = false; 202 key_timer_t* info = new key_timer_t; 203 info->ui = this; 204 info->key_code = key_code; 205 info->count = key_down_count; 206 pthread_t thread; 207 pthread_create(&thread, nullptr, &RecoveryUI::time_key_helper, info); 208 pthread_detach(thread); 209 } else { 210 if (key_last_down == key_code) { 211 long_press = key_long_press; 212 register_key = true; 213 } 214 key_last_down = -1; 215 } 216 reboot_enabled = enable_reboot; 217 pthread_mutex_unlock(&key_queue_mutex); 218 219 if (register_key) { 220 switch (CheckKey(key_code, long_press)) { 221 case RecoveryUI::IGNORE: 222 break; 223 224 case RecoveryUI::TOGGLE: 225 ShowText(!IsTextVisible()); 226 break; 227 228 case RecoveryUI::REBOOT: 229 if (reboot_enabled) { 230 reboot("reboot,"); 231 while (true) { pause(); } 232 } 233 break; 234 235 case RecoveryUI::ENQUEUE: 236 EnqueueKey(key_code); 237 break; 238 } 239 } 240 } 241 242 void* RecoveryUI::time_key_helper(void* cookie) { 243 key_timer_t* info = static_cast<key_timer_t*>(cookie); 244 info->ui->time_key(info->key_code, info->count); 245 delete info; 246 return nullptr; 247 } 248 249 void RecoveryUI::time_key(int key_code, int count) { 250 usleep(750000); // 750 ms == "long" 251 bool long_press = false; 252 pthread_mutex_lock(&key_queue_mutex); 253 if (key_last_down == key_code && key_down_count == count) { 254 long_press = key_long_press = true; 255 } 256 pthread_mutex_unlock(&key_queue_mutex); 257 if (long_press) KeyLongPress(key_code); 258 } 259 260 void RecoveryUI::EnqueueKey(int key_code) { 261 pthread_mutex_lock(&key_queue_mutex); 262 const int queue_max = sizeof(key_queue) / sizeof(key_queue[0]); 263 if (key_queue_len < queue_max) { 264 key_queue[key_queue_len++] = key_code; 265 pthread_cond_signal(&key_queue_cond); 266 } 267 pthread_mutex_unlock(&key_queue_mutex); 268 } 269 270 int RecoveryUI::WaitKey() { 271 pthread_mutex_lock(&key_queue_mutex); 272 273 // Time out after UI_WAIT_KEY_TIMEOUT_SEC, unless a USB cable is 274 // plugged in. 275 do { 276 struct timeval now; 277 struct timespec timeout; 278 gettimeofday(&now, nullptr); 279 timeout.tv_sec = now.tv_sec; 280 timeout.tv_nsec = now.tv_usec * 1000; 281 timeout.tv_sec += UI_WAIT_KEY_TIMEOUT_SEC; 282 283 int rc = 0; 284 while (key_queue_len == 0 && rc != ETIMEDOUT) { 285 rc = pthread_cond_timedwait(&key_queue_cond, &key_queue_mutex, &timeout); 286 } 287 288 if (screensaver_state_ != ScreensaverState::DISABLED) { 289 if (rc == ETIMEDOUT) { 290 // Lower the brightness level: NORMAL -> DIMMED; DIMMED -> OFF. 291 if (screensaver_state_ == ScreensaverState::NORMAL) { 292 if (android::base::WriteStringToFile(std::to_string(brightness_dimmed_value_), 293 BRIGHTNESS_FILE)) { 294 LOG(INFO) << "Brightness: " << brightness_dimmed_value_ << " (" << brightness_dimmed_ 295 << "%)"; 296 screensaver_state_ = ScreensaverState::DIMMED; 297 } 298 } else if (screensaver_state_ == ScreensaverState::DIMMED) { 299 if (android::base::WriteStringToFile("0", BRIGHTNESS_FILE)) { 300 LOG(INFO) << "Brightness: 0 (off)"; 301 screensaver_state_ = ScreensaverState::OFF; 302 } 303 } 304 } else if (screensaver_state_ != ScreensaverState::NORMAL) { 305 // Drop the first key if it's changing from OFF to NORMAL. 306 if (screensaver_state_ == ScreensaverState::OFF) { 307 if (key_queue_len > 0) { 308 memcpy(&key_queue[0], &key_queue[1], sizeof(int) * --key_queue_len); 309 } 310 } 311 312 // Reset the brightness to normal. 313 if (android::base::WriteStringToFile(std::to_string(brightness_normal_value_), 314 BRIGHTNESS_FILE)) { 315 screensaver_state_ = ScreensaverState::NORMAL; 316 LOG(INFO) << "Brightness: " << brightness_normal_value_ << " (" << brightness_normal_ 317 << "%)"; 318 } 319 } 320 } 321 } while (IsUsbConnected() && key_queue_len == 0); 322 323 int key = -1; 324 if (key_queue_len > 0) { 325 key = key_queue[0]; 326 memcpy(&key_queue[0], &key_queue[1], sizeof(int) * --key_queue_len); 327 } 328 pthread_mutex_unlock(&key_queue_mutex); 329 return key; 330 } 331 332 bool RecoveryUI::IsUsbConnected() { 333 int fd = open("/sys/class/android_usb/android0/state", O_RDONLY); 334 if (fd < 0) { 335 printf("failed to open /sys/class/android_usb/android0/state: %s\n", 336 strerror(errno)); 337 return 0; 338 } 339 340 char buf; 341 // USB is connected if android_usb state is CONNECTED or CONFIGURED. 342 int connected = (TEMP_FAILURE_RETRY(read(fd, &buf, 1)) == 1) && (buf == 'C'); 343 if (close(fd) < 0) { 344 printf("failed to close /sys/class/android_usb/android0/state: %s\n", 345 strerror(errno)); 346 } 347 return connected; 348 } 349 350 bool RecoveryUI::IsKeyPressed(int key) { 351 pthread_mutex_lock(&key_queue_mutex); 352 int pressed = key_pressed[key]; 353 pthread_mutex_unlock(&key_queue_mutex); 354 return pressed; 355 } 356 357 bool RecoveryUI::IsLongPress() { 358 pthread_mutex_lock(&key_queue_mutex); 359 bool result = key_long_press; 360 pthread_mutex_unlock(&key_queue_mutex); 361 return result; 362 } 363 364 bool RecoveryUI::HasThreeButtons() { 365 return has_power_key && has_up_key && has_down_key; 366 } 367 368 void RecoveryUI::FlushKeys() { 369 pthread_mutex_lock(&key_queue_mutex); 370 key_queue_len = 0; 371 pthread_mutex_unlock(&key_queue_mutex); 372 } 373 374 RecoveryUI::KeyAction RecoveryUI::CheckKey(int key, bool is_long_press) { 375 pthread_mutex_lock(&key_queue_mutex); 376 key_long_press = false; 377 pthread_mutex_unlock(&key_queue_mutex); 378 379 // If we have power and volume up keys, that chord is the signal to toggle the text display. 380 if (HasThreeButtons()) { 381 if (key == KEY_VOLUMEUP && IsKeyPressed(KEY_POWER)) { 382 return TOGGLE; 383 } 384 } else { 385 // Otherwise long press of any button toggles to the text display, 386 // and there's no way to toggle back (but that's pretty useless anyway). 387 if (is_long_press && !IsTextVisible()) { 388 return TOGGLE; 389 } 390 391 // Also, for button-limited devices, a long press is translated to KEY_ENTER. 392 if (is_long_press && IsTextVisible()) { 393 EnqueueKey(KEY_ENTER); 394 return IGNORE; 395 } 396 } 397 398 // Press power seven times in a row to reboot. 399 if (key == KEY_POWER) { 400 pthread_mutex_lock(&key_queue_mutex); 401 bool reboot_enabled = enable_reboot; 402 pthread_mutex_unlock(&key_queue_mutex); 403 404 if (reboot_enabled) { 405 ++consecutive_power_keys; 406 if (consecutive_power_keys >= 7) { 407 return REBOOT; 408 } 409 } 410 } else { 411 consecutive_power_keys = 0; 412 } 413 414 last_key = key; 415 return (IsTextVisible() || screensaver_state_ == ScreensaverState::OFF) ? ENQUEUE : IGNORE; 416 } 417 418 void RecoveryUI::KeyLongPress(int) { 419 } 420 421 void RecoveryUI::SetEnableReboot(bool enabled) { 422 pthread_mutex_lock(&key_queue_mutex); 423 enable_reboot = enabled; 424 pthread_mutex_unlock(&key_queue_mutex); 425 } 426 427 void RecoveryUI::SetLocale(const std::string& new_locale) { 428 this->locale_ = new_locale; 429 this->rtl_locale_ = false; 430 431 if (!new_locale.empty()) { 432 size_t underscore = new_locale.find('_'); 433 // lang has the language prefix prior to '_', or full string if '_' doesn't exist. 434 std::string lang = new_locale.substr(0, underscore); 435 436 // A bit cheesy: keep an explicit list of supported RTL languages. 437 if (lang == "ar" || // Arabic 438 lang == "fa" || // Persian (Farsi) 439 lang == "he" || // Hebrew (new language code) 440 lang == "iw" || // Hebrew (old language code) 441 lang == "ur") { // Urdu 442 rtl_locale_ = true; 443 } 444 } 445 } 446