/*
* 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 <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
// There's only (at most) one of these objects, and global callbacks
// (for pthread_create, and the input event system) need to find it,
// so use a global variable.
static RecoveryUI* self = NULL;
RecoveryUI::RecoveryUI() :
key_queue_len(0),
key_last_down(-1),
key_long_press(false),
key_down_count(0),
consecutive_power_keys(0),
consecutive_alternate_keys(0),
last_key(-1) {
pthread_mutex_init(&key_queue_mutex, NULL);
pthread_cond_init(&key_queue_cond, NULL);
self = this;
memset(key_pressed, 0, sizeof(key_pressed));
}
void RecoveryUI::Init() {
ev_init(input_callback, NULL);
pthread_create(&input_t, NULL, input_thread, NULL);
}
int RecoveryUI::input_callback(int fd, short revents, void* data)
{
struct input_event ev;
int ret;
ret = ev_get_input(fd, revents, &ev);
if (ret)
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.
self->rel_sum += ev.value;
if (self->rel_sum > 3) {
self->process_key(KEY_DOWN, 1); // press down key
self->process_key(KEY_DOWN, 0); // and release it
self->rel_sum = 0;
} else if (self->rel_sum < -3) {
self->process_key(KEY_UP, 1); // press up key
self->process_key(KEY_UP, 0); // and release it
self->rel_sum = 0;
}
}
} else {
self->rel_sum = 0;
}
if (ev.type == EV_KEY && ev.code <= KEY_MAX)
self->process_key(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::process_key(int key_code, int updown) {
bool register_key = false;
bool long_press = false;
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;
pthread_t th;
key_timer_t* info = new key_timer_t;
info->ui = this;
info->key_code = key_code;
info->count = key_down_count;
pthread_create(&th, NULL, &RecoveryUI::time_key_helper, info);
pthread_detach(th);
} else {
if (key_last_down == key_code) {
long_press = key_long_press;
register_key = true;
}
key_last_down = -1;
}
pthread_mutex_unlock(&key_queue_mutex);
if (register_key) {
NextCheckKeyIsLong(long_press);
switch (CheckKey(key_code)) {
case RecoveryUI::IGNORE:
break;
case RecoveryUI::TOGGLE:
ShowText(!IsTextVisible());
break;
case RecoveryUI::REBOOT:
android_reboot(ANDROID_RB_RESTART, 0, 0);
break;
case RecoveryUI::ENQUEUE:
EnqueueKey(key_code);
break;
case RecoveryUI::MOUNT_SYSTEM:
#ifndef NO_RECOVERY_MOUNT
ensure_path_mounted("/system");
Print("Mounted /system.");
#endif
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 NULL;
}
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);
}
// Reads input events, handles special hot keys, and adds to the key queue.
void* RecoveryUI::input_thread(void *cookie)
{
for (;;) {
if (!ev_wait(-1))
ev_dispatch();
}
return NULL;
}
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, NULL);
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 (usb_connected() && 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;
}
// Return true if USB is connected.
bool RecoveryUI::usb_connected() {
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 = (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;
}
void RecoveryUI::FlushKeys() {
pthread_mutex_lock(&key_queue_mutex);
key_queue_len = 0;
pthread_mutex_unlock(&key_queue_mutex);
}
// The default CheckKey implementation assumes the device has power,
// volume up, and volume down keys.
//
// - Hold power and press vol-up to toggle display.
// - Press power seven times in a row to reboot.
// - Alternate vol-up and vol-down seven times to mount /system.
RecoveryUI::KeyAction RecoveryUI::CheckKey(int key) {
if (IsKeyPressed(KEY_POWER) && key == KEY_VOLUMEUP) {
return TOGGLE;
}
if (key == KEY_POWER) {
++consecutive_power_keys;
if (consecutive_power_keys >= 7) {
return REBOOT;
}
} else {
consecutive_power_keys = 0;
}
if ((key == KEY_VOLUMEUP &&
(last_key == KEY_VOLUMEDOWN || last_key == -1)) ||
(key == KEY_VOLUMEDOWN &&
(last_key == KEY_VOLUMEUP || last_key == -1))) {
++consecutive_alternate_keys;
if (consecutive_alternate_keys >= 7) {
consecutive_alternate_keys = 0;
return MOUNT_SYSTEM;
}
} else {
consecutive_alternate_keys = 0;
}
last_key = key;
return ENQUEUE;
}
void RecoveryUI::NextCheckKeyIsLong(bool is_long_press) {
}
void RecoveryUI::KeyLongPress(int key) {
}
