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