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 <errno.h> 18 #include <fcntl.h> 19 #include <linux/input.h> 20 #include <pthread.h> 21 #include <stdarg.h> 22 #include <stdio.h> 23 #include <stdlib.h> 24 #include <string.h> 25 #include <sys/stat.h> 26 #include <sys/time.h> 27 #include <sys/types.h> 28 #include <time.h> 29 #include <unistd.h> 30 31 #include <cutils/android_reboot.h> 32 33 #include "common.h" 34 #include "roots.h" 35 #include "device.h" 36 #include "minui/minui.h" 37 #include "screen_ui.h" 38 #include "ui.h" 39 40 #define UI_WAIT_KEY_TIMEOUT_SEC 120 41 42 RecoveryUI::RecoveryUI() 43 : key_queue_len(0), 44 key_last_down(-1), 45 key_long_press(false), 46 key_down_count(0), 47 enable_reboot(true), 48 consecutive_power_keys(0), 49 last_key(-1), 50 has_power_key(false), 51 has_up_key(false), 52 has_down_key(false) { 53 pthread_mutex_init(&key_queue_mutex, nullptr); 54 pthread_cond_init(&key_queue_cond, nullptr); 55 memset(key_pressed, 0, sizeof(key_pressed)); 56 } 57 58 void RecoveryUI::OnKeyDetected(int key_code) { 59 if (key_code == KEY_POWER) { 60 has_power_key = true; 61 } else if (key_code == KEY_DOWN || key_code == KEY_VOLUMEDOWN) { 62 has_down_key = true; 63 } else if (key_code == KEY_UP || key_code == KEY_VOLUMEUP) { 64 has_up_key = true; 65 } 66 } 67 68 int RecoveryUI::InputCallback(int fd, uint32_t epevents, void* data) { 69 return reinterpret_cast<RecoveryUI*>(data)->OnInputEvent(fd, epevents); 70 } 71 72 // Reads input events, handles special hot keys, and adds to the key queue. 73 static void* InputThreadLoop(void*) { 74 while (true) { 75 if (!ev_wait(-1)) { 76 ev_dispatch(); 77 } 78 } 79 return nullptr; 80 } 81 82 void RecoveryUI::Init() { 83 ev_init(InputCallback, this); 84 85 ev_iterate_available_keys(std::bind(&RecoveryUI::OnKeyDetected, this, std::placeholders::_1)); 86 87 pthread_create(&input_thread_, nullptr, InputThreadLoop, nullptr); 88 } 89 90 int RecoveryUI::OnInputEvent(int fd, uint32_t epevents) { 91 struct input_event ev; 92 if (ev_get_input(fd, epevents, &ev) == -1) { 93 return -1; 94 } 95 96 if (ev.type == EV_SYN) { 97 return 0; 98 } else if (ev.type == EV_REL) { 99 if (ev.code == REL_Y) { 100 // accumulate the up or down motion reported by 101 // the trackball. When it exceeds a threshold 102 // (positive or negative), fake an up/down 103 // key event. 104 rel_sum += ev.value; 105 if (rel_sum > 3) { 106 ProcessKey(KEY_DOWN, 1); // press down key 107 ProcessKey(KEY_DOWN, 0); // and release it 108 rel_sum = 0; 109 } else if (rel_sum < -3) { 110 ProcessKey(KEY_UP, 1); // press up key 111 ProcessKey(KEY_UP, 0); // and release it 112 rel_sum = 0; 113 } 114 } 115 } else { 116 rel_sum = 0; 117 } 118 119 if (ev.type == EV_KEY && ev.code <= KEY_MAX) { 120 ProcessKey(ev.code, ev.value); 121 } 122 123 return 0; 124 } 125 126 // Process a key-up or -down event. A key is "registered" when it is 127 // pressed and then released, with no other keypresses or releases in 128 // between. Registered keys are passed to CheckKey() to see if it 129 // should trigger a visibility toggle, an immediate reboot, or be 130 // queued to be processed next time the foreground thread wants a key 131 // (eg, for the menu). 132 // 133 // We also keep track of which keys are currently down so that 134 // CheckKey can call IsKeyPressed to see what other keys are held when 135 // a key is registered. 136 // 137 // updown == 1 for key down events; 0 for key up events 138 void RecoveryUI::ProcessKey(int key_code, int updown) { 139 bool register_key = false; 140 bool long_press = false; 141 bool reboot_enabled; 142 143 pthread_mutex_lock(&key_queue_mutex); 144 key_pressed[key_code] = updown; 145 if (updown) { 146 ++key_down_count; 147 key_last_down = key_code; 148 key_long_press = false; 149 key_timer_t* info = new key_timer_t; 150 info->ui = this; 151 info->key_code = key_code; 152 info->count = key_down_count; 153 pthread_t thread; 154 pthread_create(&thread, nullptr, &RecoveryUI::time_key_helper, info); 155 pthread_detach(thread); 156 } else { 157 if (key_last_down == key_code) { 158 long_press = key_long_press; 159 register_key = true; 160 } 161 key_last_down = -1; 162 } 163 reboot_enabled = enable_reboot; 164 pthread_mutex_unlock(&key_queue_mutex); 165 166 if (register_key) { 167 switch (CheckKey(key_code, long_press)) { 168 case RecoveryUI::IGNORE: 169 break; 170 171 case RecoveryUI::TOGGLE: 172 ShowText(!IsTextVisible()); 173 break; 174 175 case RecoveryUI::REBOOT: 176 if (reboot_enabled) { 177 android_reboot(ANDROID_RB_RESTART, 0, 0); 178 } 179 break; 180 181 case RecoveryUI::ENQUEUE: 182 EnqueueKey(key_code); 183 break; 184 } 185 } 186 } 187 188 void* RecoveryUI::time_key_helper(void* cookie) { 189 key_timer_t* info = (key_timer_t*) cookie; 190 info->ui->time_key(info->key_code, info->count); 191 delete info; 192 return nullptr; 193 } 194 195 void RecoveryUI::time_key(int key_code, int count) { 196 usleep(750000); // 750 ms == "long" 197 bool long_press = false; 198 pthread_mutex_lock(&key_queue_mutex); 199 if (key_last_down == key_code && key_down_count == count) { 200 long_press = key_long_press = true; 201 } 202 pthread_mutex_unlock(&key_queue_mutex); 203 if (long_press) KeyLongPress(key_code); 204 } 205 206 void RecoveryUI::EnqueueKey(int key_code) { 207 pthread_mutex_lock(&key_queue_mutex); 208 const int queue_max = sizeof(key_queue) / sizeof(key_queue[0]); 209 if (key_queue_len < queue_max) { 210 key_queue[key_queue_len++] = key_code; 211 pthread_cond_signal(&key_queue_cond); 212 } 213 pthread_mutex_unlock(&key_queue_mutex); 214 } 215 216 int RecoveryUI::WaitKey() { 217 pthread_mutex_lock(&key_queue_mutex); 218 219 // Time out after UI_WAIT_KEY_TIMEOUT_SEC, unless a USB cable is 220 // plugged in. 221 do { 222 struct timeval now; 223 struct timespec timeout; 224 gettimeofday(&now, nullptr); 225 timeout.tv_sec = now.tv_sec; 226 timeout.tv_nsec = now.tv_usec * 1000; 227 timeout.tv_sec += UI_WAIT_KEY_TIMEOUT_SEC; 228 229 int rc = 0; 230 while (key_queue_len == 0 && rc != ETIMEDOUT) { 231 rc = pthread_cond_timedwait(&key_queue_cond, &key_queue_mutex, &timeout); 232 } 233 } while (IsUsbConnected() && key_queue_len == 0); 234 235 int key = -1; 236 if (key_queue_len > 0) { 237 key = key_queue[0]; 238 memcpy(&key_queue[0], &key_queue[1], sizeof(int) * --key_queue_len); 239 } 240 pthread_mutex_unlock(&key_queue_mutex); 241 return key; 242 } 243 244 bool RecoveryUI::IsUsbConnected() { 245 int fd = open("/sys/class/android_usb/android0/state", O_RDONLY); 246 if (fd < 0) { 247 printf("failed to open /sys/class/android_usb/android0/state: %s\n", 248 strerror(errno)); 249 return 0; 250 } 251 252 char buf; 253 // USB is connected if android_usb state is CONNECTED or CONFIGURED. 254 int connected = (TEMP_FAILURE_RETRY(read(fd, &buf, 1)) == 1) && (buf == 'C'); 255 if (close(fd) < 0) { 256 printf("failed to close /sys/class/android_usb/android0/state: %s\n", 257 strerror(errno)); 258 } 259 return connected; 260 } 261 262 bool RecoveryUI::IsKeyPressed(int key) { 263 pthread_mutex_lock(&key_queue_mutex); 264 int pressed = key_pressed[key]; 265 pthread_mutex_unlock(&key_queue_mutex); 266 return pressed; 267 } 268 269 bool RecoveryUI::IsLongPress() { 270 pthread_mutex_lock(&key_queue_mutex); 271 bool result = key_long_press; 272 pthread_mutex_unlock(&key_queue_mutex); 273 return result; 274 } 275 276 bool RecoveryUI::HasThreeButtons() { 277 return has_power_key && has_up_key && has_down_key; 278 } 279 280 void RecoveryUI::FlushKeys() { 281 pthread_mutex_lock(&key_queue_mutex); 282 key_queue_len = 0; 283 pthread_mutex_unlock(&key_queue_mutex); 284 } 285 286 RecoveryUI::KeyAction RecoveryUI::CheckKey(int key, bool is_long_press) { 287 pthread_mutex_lock(&key_queue_mutex); 288 key_long_press = false; 289 pthread_mutex_unlock(&key_queue_mutex); 290 291 // If we have power and volume up keys, that chord is the signal to toggle the text display. 292 if (HasThreeButtons()) { 293 if (key == KEY_VOLUMEUP && IsKeyPressed(KEY_POWER)) { 294 return TOGGLE; 295 } 296 } else { 297 // Otherwise long press of any button toggles to the text display, 298 // and there's no way to toggle back (but that's pretty useless anyway). 299 if (is_long_press && !IsTextVisible()) { 300 return TOGGLE; 301 } 302 303 // Also, for button-limited devices, a long press is translated to KEY_ENTER. 304 if (is_long_press && IsTextVisible()) { 305 EnqueueKey(KEY_ENTER); 306 return IGNORE; 307 } 308 } 309 310 // Press power seven times in a row to reboot. 311 if (key == KEY_POWER) { 312 pthread_mutex_lock(&key_queue_mutex); 313 bool reboot_enabled = enable_reboot; 314 pthread_mutex_unlock(&key_queue_mutex); 315 316 if (reboot_enabled) { 317 ++consecutive_power_keys; 318 if (consecutive_power_keys >= 7) { 319 return REBOOT; 320 } 321 } 322 } else { 323 consecutive_power_keys = 0; 324 } 325 326 last_key = key; 327 return IsTextVisible() ? ENQUEUE : IGNORE; 328 } 329 330 void RecoveryUI::KeyLongPress(int) { 331 } 332 333 void RecoveryUI::SetEnableReboot(bool enabled) { 334 pthread_mutex_lock(&key_queue_mutex); 335 enable_reboot = enabled; 336 pthread_mutex_unlock(&key_queue_mutex); 337 } 338
