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