ui.cpp - android_bootable_recovery - Gitiles

 /*
  * 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;
 }

 void RecoveryUI::Init() {
     ev_init(input_callback, NULL);
     pthread_create(&input_t, NULL, input_thread, NULL);
 }


 int RecoveryUI::input_callback(int fd, unsigned int epevents, void* data)
 {
     struct input_event ev;
     int ret;

     ret = ev_get_input(fd, epevents, &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) {
 }
	/*
	* 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;
	}

	void RecoveryUI::Init() {
	ev_init(input_callback, NULL);
	pthread_create(&input_t, NULL, input_thread, NULL);
	}


	int RecoveryUI::input_callback(int fd, unsigned int epevents, void* data)
	{
	struct input_event ev;
	int ret;

	ret = ev_get_input(fd, epevents, &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) {
	}