aboutsummaryrefslogtreecommitdiffstats
path: root/ui.cpp
blob: 78b6e4f1b95b203bdaef09ca2b43a5846fd1798c (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <errno.h>
#include <fcntl.h>
#include <linux/input.h>
#include <pthread.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>

#include <android-base/properties.h>
#include <cutils/android_reboot.h>

#include "common.h"
#include "roots.h"
#include "device.h"
#include "minui/minui.h"
#include "screen_ui.h"
#include "ui.h"

#define UI_WAIT_KEY_TIMEOUT_SEC    120

RecoveryUI::RecoveryUI()
        : key_queue_len(0),
          key_last_down(-1),
          key_long_press(false),
          key_down_count(0),
          enable_reboot(true),
          consecutive_power_keys(0),
          last_key(-1),
          has_power_key(false),
          has_up_key(false),
          has_down_key(false) {
    pthread_mutex_init(&key_queue_mutex, nullptr);
    pthread_cond_init(&key_queue_cond, nullptr);
    memset(key_pressed, 0, sizeof(key_pressed));
}

void RecoveryUI::OnKeyDetected(int key_code) {
    if (key_code == KEY_POWER) {
        has_power_key = true;
    } else if (key_code == KEY_DOWN || key_code == KEY_VOLUMEDOWN) {
        has_down_key = true;
    } else if (key_code == KEY_UP || key_code == KEY_VOLUMEUP) {
        has_up_key = true;
    }
}

int RecoveryUI::InputCallback(int fd, uint32_t epevents, void* data) {
    return reinterpret_cast<RecoveryUI*>(data)->OnInputEvent(fd, epevents);
}

// Reads input events, handles special hot keys, and adds to the key queue.
static void* InputThreadLoop(void*) {
    while (true) {
        if (!ev_wait(-1)) {
            ev_dispatch();
        }
    }
    return nullptr;
}

void RecoveryUI::Init() {
    ev_init(InputCallback, this);

    ev_iterate_available_keys(std::bind(&RecoveryUI::OnKeyDetected, this, std::placeholders::_1));

    pthread_create(&input_thread_, nullptr, InputThreadLoop, nullptr);
}

int RecoveryUI::OnInputEvent(int fd, uint32_t epevents) {
    struct input_event ev;
    if (ev_get_input(fd, epevents, &ev) == -1) {
        return -1;
    }

    if (ev.type == EV_SYN) {
        return 0;
    } else if (ev.type == EV_REL) {
        if (ev.code == REL_Y) {
            // accumulate the up or down motion reported by
            // the trackball.  When it exceeds a threshold
            // (positive or negative), fake an up/down
            // key event.
            rel_sum += ev.value;
            if (rel_sum > 3) {
                ProcessKey(KEY_DOWN, 1);   // press down key
                ProcessKey(KEY_DOWN, 0);   // and release it
                rel_sum = 0;
            } else if (rel_sum < -3) {
                ProcessKey(KEY_UP, 1);     // press up key
                ProcessKey(KEY_UP, 0);     // and release it
                rel_sum = 0;
            }
        }
    } else {
        rel_sum = 0;
    }

    if (ev.type == EV_KEY && ev.code <= KEY_MAX) {
        ProcessKey(ev.code, ev.value);
    }

    return 0;
}

// Process a key-up or -down event.  A key is "registered" when it is
// pressed and then released, with no other keypresses or releases in
// between.  Registered keys are passed to CheckKey() to see if it
// should trigger a visibility toggle, an immediate reboot, or be
// queued to be processed next time the foreground thread wants a key
// (eg, for the menu).
//
// We also keep track of which keys are currently down so that
// CheckKey can call IsKeyPressed to see what other keys are held when
// a key is registered.
//
// updown == 1 for key down events; 0 for key up events
void RecoveryUI::ProcessKey(int key_code, int updown) {
    bool register_key = false;
    bool long_press = false;
    bool reboot_enabled;

    pthread_mutex_lock(&key_queue_mutex);
    key_pressed[key_code] = updown;
    if (updown) {
        ++key_down_count;
        key_last_down = key_code;
        key_long_press = false;
        key_timer_t* info = new key_timer_t;
        info->ui = this;
        info->key_code = key_code;
        info->count = key_down_count;
        pthread_t thread;
        pthread_create(&thread, nullptr, &RecoveryUI::time_key_helper, info);
        pthread_detach(thread);
    } else {
        if (key_last_down == key_code) {
            long_press = key_long_press;
            register_key = true;
        }
        key_last_down = -1;
    }
    reboot_enabled = enable_reboot;
    pthread_mutex_unlock(&key_queue_mutex);

    if (register_key) {
        switch (CheckKey(key_code, long_press)) {
          case RecoveryUI::IGNORE:
            break;

          case RecoveryUI::TOGGLE:
            ShowText(!IsTextVisible());
            break;

          case RecoveryUI::REBOOT:
            if (reboot_enabled) {
                android::base::SetProperty(ANDROID_RB_PROPERTY, "reboot,");
                while (true) { pause(); }
            }
            break;

          case RecoveryUI::ENQUEUE:
            EnqueueKey(key_code);
            break;
        }
    }
}

void* RecoveryUI::time_key_helper(void* cookie) {
    key_timer_t* info = (key_timer_t*) cookie;
    info->ui->time_key(info->key_code, info->count);
    delete info;
    return nullptr;
}

void RecoveryUI::time_key(int key_code, int count) {
    usleep(750000);  // 750 ms == "long"
    bool long_press = false;
    pthread_mutex_lock(&key_queue_mutex);
    if (key_last_down == key_code && key_down_count == count) {
        long_press = key_long_press = true;
    }
    pthread_mutex_unlock(&key_queue_mutex);
    if (long_press) KeyLongPress(key_code);
}

void RecoveryUI::EnqueueKey(int key_code) {
    pthread_mutex_lock(&key_queue_mutex);
    const int queue_max = sizeof(key_queue) / sizeof(key_queue[0]);
    if (key_queue_len < queue_max) {
        key_queue[key_queue_len++] = key_code;
        pthread_cond_signal(&key_queue_cond);
    }
    pthread_mutex_unlock(&key_queue_mutex);
}

int RecoveryUI::WaitKey() {
    pthread_mutex_lock(&key_queue_mutex);

    // Time out after UI_WAIT_KEY_TIMEOUT_SEC, unless a USB cable is
    // plugged in.
    do {
        struct timeval now;
        struct timespec timeout;
        gettimeofday(&now, nullptr);
        timeout.tv_sec = now.tv_sec;
        timeout.tv_nsec = now.tv_usec * 1000;
        timeout.tv_sec += UI_WAIT_KEY_TIMEOUT_SEC;

        int rc = 0;
        while (key_queue_len == 0 && rc != ETIMEDOUT) {
            rc = pthread_cond_timedwait(&key_queue_cond, &key_queue_mutex, &timeout);
        }
    } while (IsUsbConnected() && key_queue_len == 0);

    int key = -1;
    if (key_queue_len > 0) {
        key = key_queue[0];
        memcpy(&key_queue[0], &key_queue[1], sizeof(int) * --key_queue_len);
    }
    pthread_mutex_unlock(&key_queue_mutex);
    return key;
}

bool RecoveryUI::IsUsbConnected() {
    int fd = open("/sys/class/android_usb/android0/state", O_RDONLY);
    if (fd < 0) {
        printf("failed to open /sys/class/android_usb/android0/state: %s\n",
               strerror(errno));
        return 0;
    }

    char buf;
    // USB is connected if android_usb state is CONNECTED or CONFIGURED.
    int connected = (TEMP_FAILURE_RETRY(read(fd, &buf, 1)) == 1) && (buf == 'C');
    if (close(fd) < 0) {
        printf("failed to close /sys/class/android_usb/android0/state: %s\n",
               strerror(errno));
    }
    return connected;
}

bool RecoveryUI::IsKeyPressed(int key) {
    pthread_mutex_lock(&key_queue_mutex);
    int pressed = key_pressed[key];
    pthread_mutex_unlock(&key_queue_mutex);
    return pressed;
}

bool RecoveryUI::IsLongPress() {
    pthread_mutex_lock(&key_queue_mutex);
    bool result = key_long_press;
    pthread_mutex_unlock(&key_queue_mutex);
    return result;
}

bool RecoveryUI::HasThreeButtons() {
    return has_power_key && has_up_key && has_down_key;
}

void RecoveryUI::FlushKeys() {
    pthread_mutex_lock(&key_queue_mutex);
    key_queue_len = 0;
    pthread_mutex_unlock(&key_queue_mutex);
}

RecoveryUI::KeyAction RecoveryUI::CheckKey(int key, bool is_long_press) {
    pthread_mutex_lock(&key_queue_mutex);
    key_long_press = false;
    pthread_mutex_unlock(&key_queue_mutex);

    // If we have power and volume up keys, that chord is the signal to toggle the text display.
    if (HasThreeButtons()) {
        if (key == KEY_VOLUMEUP && IsKeyPressed(KEY_POWER)) {
            return TOGGLE;
        }
    } else {
        // Otherwise long press of any button toggles to the text display,
        // and there's no way to toggle back (but that's pretty useless anyway).
        if (is_long_press && !IsTextVisible()) {
            return TOGGLE;
        }

        // Also, for button-limited devices, a long press is translated to KEY_ENTER.
        if (is_long_press && IsTextVisible()) {
            EnqueueKey(KEY_ENTER);
            return IGNORE;
        }
    }

    // Press power seven times in a row to reboot.
    if (key == KEY_POWER) {
        pthread_mutex_lock(&key_queue_mutex);
        bool reboot_enabled = enable_reboot;
        pthread_mutex_unlock(&key_queue_mutex);

        if (reboot_enabled) {
            ++consecutive_power_keys;
            if (consecutive_power_keys >= 7) {
                return REBOOT;
            }
        }
    } else {
        consecutive_power_keys = 0;
    }

    last_key = key;
    return IsTextVisible() ? ENQUEUE : IGNORE;
}

void RecoveryUI::KeyLongPress(int) {
}

void RecoveryUI::SetEnableReboot(bool enabled) {
    pthread_mutex_lock(&key_queue_mutex);
    enable_reboot = enabled;
    pthread_mutex_unlock(&key_queue_mutex);
}