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
RecoveryUI()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
OnKeyDetected(int key_code)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
InputCallback(int fd,uint32_t epevents,void * data)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.
InputThreadLoop(void *)73 static void* InputThreadLoop(void*) {
74 while (true) {
75 if (!ev_wait(-1)) {
76 ev_dispatch();
77 }
78 }
79 return nullptr;
80 }
81
Init()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
OnInputEvent(int fd,uint32_t epevents)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
ProcessKey(int key_code,int updown)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
time_key_helper(void * cookie)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
time_key(int key_code,int count)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
EnqueueKey(int key_code)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
WaitKey()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
IsUsbConnected()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
IsKeyPressed(int key)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
IsLongPress()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
HasThreeButtons()276 bool RecoveryUI::HasThreeButtons() {
277 return has_power_key && has_up_key && has_down_key;
278 }
279
FlushKeys()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
CheckKey(int key,bool is_long_press)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
KeyLongPress(int)330 void RecoveryUI::KeyLongPress(int) {
331 }
332
SetEnableReboot(bool enabled)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