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 "device.h" 35 #include "minui/minui.h" 36 #include "screen_ui.h" 37 #include "ui.h" 38 39 #define UI_WAIT_KEY_TIMEOUT_SEC 120 40 41 // There's only (at most) one of these objects, and global callbacks 42 // (for pthread_create, and the input event system) need to find it, 43 // so use a global variable. 44 static RecoveryUI* self = NULL; 45 46 RecoveryUI::RecoveryUI() : 47 key_queue_len(0), 48 key_last_down(-1), 49 key_long_press(false), 50 key_down_count(0) { 51 pthread_mutex_init(&key_queue_mutex, NULL); 52 pthread_cond_init(&key_queue_cond, NULL); 53 self = this; 54 } 55 56 void RecoveryUI::Init() { 57 ev_init(input_callback, NULL); 58 pthread_create(&input_t, NULL, input_thread, NULL); 59 } 60 61 62 int RecoveryUI::input_callback(int fd, short revents, void* data) 63 { 64 struct input_event ev; 65 int ret; 66 67 ret = ev_get_input(fd, revents, &ev); 68 if (ret) 69 return -1; 70 71 if (ev.type == EV_SYN) { 72 return 0; 73 } else if (ev.type == EV_REL) { 74 if (ev.code == REL_Y) { 75 // accumulate the up or down motion reported by 76 // the trackball. When it exceeds a threshold 77 // (positive or negative), fake an up/down 78 // key event. 79 self->rel_sum += ev.value; 80 if (self->rel_sum > 3) { 81 self->process_key(KEY_DOWN, 1); // press down key 82 self->process_key(KEY_DOWN, 0); // and release it 83 self->rel_sum = 0; 84 } else if (self->rel_sum < -3) { 85 self->process_key(KEY_UP, 1); // press up key 86 self->process_key(KEY_UP, 0); // and release it 87 self->rel_sum = 0; 88 } 89 } 90 } else { 91 self->rel_sum = 0; 92 } 93 94 if (ev.type == EV_KEY && ev.code <= KEY_MAX) 95 self->process_key(ev.code, ev.value); 96 97 return 0; 98 } 99 100 // Process a key-up or -down event. A key is "registered" when it is 101 // pressed and then released, with no other keypresses or releases in 102 // between. Registered keys are passed to CheckKey() to see if it 103 // should trigger a visibility toggle, an immediate reboot, or be 104 // queued to be processed next time the foreground thread wants a key 105 // (eg, for the menu). 106 // 107 // We also keep track of which keys are currently down so that 108 // CheckKey can call IsKeyPressed to see what other keys are held when 109 // a key is registered. 110 // 111 // updown == 1 for key down events; 0 for key up events 112 void RecoveryUI::process_key(int key_code, int updown) { 113 bool register_key = false; 114 bool long_press = false; 115 116 pthread_mutex_lock(&key_queue_mutex); 117 key_pressed[key_code] = updown; 118 if (updown) { 119 ++key_down_count; 120 key_last_down = key_code; 121 key_long_press = false; 122 pthread_t th; 123 key_timer_t* info = new key_timer_t; 124 info->ui = this; 125 info->key_code = key_code; 126 info->count = key_down_count; 127 pthread_create(&th, NULL, &RecoveryUI::time_key_helper, info); 128 pthread_detach(th); 129 } else { 130 if (key_last_down == key_code) { 131 long_press = key_long_press; 132 register_key = true; 133 } 134 key_last_down = -1; 135 } 136 pthread_mutex_unlock(&key_queue_mutex); 137 138 if (register_key) { 139 NextCheckKeyIsLong(long_press); 140 switch (CheckKey(key_code)) { 141 case RecoveryUI::IGNORE: 142 break; 143 144 case RecoveryUI::TOGGLE: 145 ShowText(!IsTextVisible()); 146 break; 147 148 case RecoveryUI::REBOOT: 149 android_reboot(ANDROID_RB_RESTART, 0, 0); 150 break; 151 152 case RecoveryUI::ENQUEUE: 153 EnqueueKey(key_code); 154 break; 155 } 156 } 157 } 158 159 void* RecoveryUI::time_key_helper(void* cookie) { 160 key_timer_t* info = (key_timer_t*) cookie; 161 info->ui->time_key(info->key_code, info->count); 162 delete info; 163 return NULL; 164 } 165 166 void RecoveryUI::time_key(int key_code, int count) { 167 usleep(750000); // 750 ms == "long" 168 bool long_press = false; 169 pthread_mutex_lock(&key_queue_mutex); 170 if (key_last_down == key_code && key_down_count == count) { 171 long_press = key_long_press = true; 172 } 173 pthread_mutex_unlock(&key_queue_mutex); 174 if (long_press) KeyLongPress(key_code); 175 } 176 177 void RecoveryUI::EnqueueKey(int key_code) { 178 pthread_mutex_lock(&key_queue_mutex); 179 const int queue_max = sizeof(key_queue) / sizeof(key_queue[0]); 180 if (key_queue_len < queue_max) { 181 key_queue[key_queue_len++] = key_code; 182 pthread_cond_signal(&key_queue_cond); 183 } 184 pthread_mutex_unlock(&key_queue_mutex); 185 } 186 187 188 // Reads input events, handles special hot keys, and adds to the key queue. 189 void* RecoveryUI::input_thread(void *cookie) 190 { 191 for (;;) { 192 if (!ev_wait(-1)) 193 ev_dispatch(); 194 } 195 return NULL; 196 } 197 198 int RecoveryUI::WaitKey() 199 { 200 pthread_mutex_lock(&key_queue_mutex); 201 202 // Time out after UI_WAIT_KEY_TIMEOUT_SEC, unless a USB cable is 203 // plugged in. 204 do { 205 struct timeval now; 206 struct timespec timeout; 207 gettimeofday(&now, NULL); 208 timeout.tv_sec = now.tv_sec; 209 timeout.tv_nsec = now.tv_usec * 1000; 210 timeout.tv_sec += UI_WAIT_KEY_TIMEOUT_SEC; 211 212 int rc = 0; 213 while (key_queue_len == 0 && rc != ETIMEDOUT) { 214 rc = pthread_cond_timedwait(&key_queue_cond, &key_queue_mutex, 215 &timeout); 216 } 217 } while (usb_connected() && key_queue_len == 0); 218 219 int key = -1; 220 if (key_queue_len > 0) { 221 key = key_queue[0]; 222 memcpy(&key_queue[0], &key_queue[1], sizeof(int) * --key_queue_len); 223 } 224 pthread_mutex_unlock(&key_queue_mutex); 225 return key; 226 } 227 228 // Return true if USB is connected. 229 bool RecoveryUI::usb_connected() { 230 int fd = open("/sys/class/android_usb/android0/state", O_RDONLY); 231 if (fd < 0) { 232 printf("failed to open /sys/class/android_usb/android0/state: %s\n", 233 strerror(errno)); 234 return 0; 235 } 236 237 char buf; 238 /* USB is connected if android_usb state is CONNECTED or CONFIGURED */ 239 int connected = (read(fd, &buf, 1) == 1) && (buf == 'C'); 240 if (close(fd) < 0) { 241 printf("failed to close /sys/class/android_usb/android0/state: %s\n", 242 strerror(errno)); 243 } 244 return connected; 245 } 246 247 bool RecoveryUI::IsKeyPressed(int key) 248 { 249 pthread_mutex_lock(&key_queue_mutex); 250 int pressed = key_pressed[key]; 251 pthread_mutex_unlock(&key_queue_mutex); 252 return pressed; 253 } 254 255 void RecoveryUI::FlushKeys() { 256 pthread_mutex_lock(&key_queue_mutex); 257 key_queue_len = 0; 258 pthread_mutex_unlock(&key_queue_mutex); 259 } 260 261 RecoveryUI::KeyAction RecoveryUI::CheckKey(int key) { 262 return RecoveryUI::ENQUEUE; 263 } 264 265 void RecoveryUI::NextCheckKeyIsLong(bool is_long_press) { 266 } 267 268 void RecoveryUI::KeyLongPress(int key) { 269 } 270
