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
RecoveryUI()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
Init()56 void RecoveryUI::Init() {
57 ev_init(input_callback, NULL);
58 pthread_create(&input_t, NULL, input_thread, NULL);
59 }
60
61
input_callback(int fd,short revents,void * data)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
process_key(int key_code,int updown)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
time_key_helper(void * cookie)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
time_key(int key_code,int count)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
EnqueueKey(int key_code)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.
input_thread(void * cookie)189 void* RecoveryUI::input_thread(void *cookie)
190 {
191 for (;;) {
192 if (!ev_wait(-1))
193 ev_dispatch();
194 }
195 return NULL;
196 }
197
WaitKey()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.
usb_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
IsKeyPressed(int key)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
FlushKeys()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
CheckKey(int key)261 RecoveryUI::KeyAction RecoveryUI::CheckKey(int key) {
262 return RecoveryUI::ENQUEUE;
263 }
264
NextCheckKeyIsLong(bool is_long_press)265 void RecoveryUI::NextCheckKeyIsLong(bool is_long_press) {
266 }
267
KeyLongPress(int key)268 void RecoveryUI::KeyLongPress(int key) {
269 }
270