从Android振子谈起

CONFIG_QPNP_VIBRATOR=y kernel/drivers/platform/msm/Kconfig

 76 config QPNP_VIBRATOR 
 77   tristate "Vibrator support for QPNP PMIC" 
 78   depends on OF_SPMI 
 79   help 
 80     This option enables device driver support for the vibrator
 81     on the Qualcomm's QPNP PMICs. The vibrator is connected on the
 82     VIB_DRV_N line and can be controlled manually or by the DTEST lines. 
 83     It uses the android timed-output framework.  kernel/drivers/platform/msm/Makefile

14 obj-$(CONFIG_QPNP_VIBRATOR) += qpnp-vibrator.o 

/* Copyright (c) 2013, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/hrtimer.h>
#include <linux/of_device.h>
#include <linux/spmi.h>

#include <linux/qpnp/vibrator.h>
#include "../../staging/android/timed_output.h"

#define QPNP_VIB_VTG_CTL(base)		(base + 0x41)
#define QPNP_VIB_EN_CTL(base)		(base + 0x46)

#define QPNP_VIB_MAX_LEVEL		31
#define QPNP_VIB_MIN_LEVEL		12

#define QPNP_VIB_DEFAULT_TIMEOUT	15000
#define QPNP_VIB_DEFAULT_VTG_LVL	3100

#define QPNP_VIB_EN			BIT(7)
#define QPNP_VIB_VTG_SET_MASK		0x1F
#define QPNP_VIB_LOGIC_SHIFT		4

struct qpnp_vib {
	struct spmi_device *spmi;
	struct hrtimer vib_timer;
	struct timed_output_dev timed_dev;
	struct work_struct work;

	u8  reg_vtg_ctl;
	u8  reg_en_ctl;
	u16 base;
	int state;
	int vtg_level;
	int timeout;
	struct mutex lock;
};

static struct qpnp_vib *vib_dev;

static int qpnp_vib_read_u8(struct qpnp_vib *vib, u8 *data, u16 reg)
{
	int rc;

	rc = spmi_ext_register_readl(vib->spmi->ctrl, vib->spmi->sid,
							reg, data, 1);
	if (rc < 0)
		dev_err(&vib->spmi->dev,
			"Error reading address: %X - ret %X\n", reg, rc);

	return rc;
}

static int qpnp_vib_write_u8(struct qpnp_vib *vib, u8 *data, u16 reg)
{
	int rc;

	rc = spmi_ext_register_writel(vib->spmi->ctrl, vib->spmi->sid,
							reg, data, 1);
	if (rc < 0)
		dev_err(&vib->spmi->dev,
			"Error writing address: %X - ret %X\n", reg, rc);

	return rc;
}

int qpnp_vibrator_config(struct qpnp_vib_config *vib_cfg)
{
	u8 reg = 0;
	int rc = -EINVAL, level;

	if (vib_dev == NULL) {
		pr_err("%s: vib_dev is NULL\n", __func__);
		return -ENODEV;
	}

	level = vib_cfg->drive_mV / 100;
	if (level) {
		if ((level < QPNP_VIB_MIN_LEVEL) ||
				(level > QPNP_VIB_MAX_LEVEL)) {
			dev_err(&vib_dev->spmi->dev, "Invalid voltage level\n");
			return -EINVAL;
		}
	} else {
		dev_err(&vib_dev->spmi->dev, "Voltage level not specified\n");
		return -EINVAL;
	}

	/* Configure the VTG CTL regiser */
	reg = vib_dev->reg_vtg_ctl;
	reg &= ~QPNP_VIB_VTG_SET_MASK;
	reg |= (level & QPNP_VIB_VTG_SET_MASK);
	rc = qpnp_vib_write_u8(vib_dev, &reg, QPNP_VIB_VTG_CTL(vib_dev->base));
	if (rc)
		return rc;
	vib_dev->reg_vtg_ctl = reg;

	/* Configure the VIB ENABLE regiser */
	reg = vib_dev->reg_en_ctl;
	reg |= (!!vib_cfg->active_low) << QPNP_VIB_LOGIC_SHIFT;
	if (vib_cfg->enable_mode == QPNP_VIB_MANUAL)
		reg |= QPNP_VIB_EN;
	else
		reg |= BIT(vib_cfg->enable_mode - 1);
	rc = qpnp_vib_write_u8(vib_dev, &reg, QPNP_VIB_EN_CTL(vib_dev->base));
	if (rc < 0)
		return rc;
	vib_dev->reg_en_ctl = reg;

	return rc;
}
EXPORT_SYMBOL(qpnp_vibrator_config);

static int qpnp_vib_set(struct qpnp_vib *vib, int on)
{
	int rc;
	u8 val;

	if (on) {
		val = vib->reg_vtg_ctl;
		val &= ~QPNP_VIB_VTG_SET_MASK;
		val |= (vib->vtg_level & QPNP_VIB_VTG_SET_MASK);
		rc = qpnp_vib_write_u8(vib, &val, QPNP_VIB_VTG_CTL(vib->base));
		if (rc < 0)
			return rc;
		vib->reg_vtg_ctl = val;
		val = vib->reg_en_ctl;
		val |= QPNP_VIB_EN;
		rc = qpnp_vib_write_u8(vib, &val, QPNP_VIB_EN_CTL(vib->base));
		if (rc < 0)
			return rc;
		vib->reg_en_ctl = val;
	} else {
		val = vib->reg_en_ctl;
		val &= ~QPNP_VIB_EN;
		rc = qpnp_vib_write_u8(vib, &val, QPNP_VIB_EN_CTL(vib->base));
		if (rc < 0)
			return rc;
		vib->reg_en_ctl = val;
	}

	return rc;
}

static void qpnp_vib_enable(struct timed_output_dev *dev, int value)
{
	struct qpnp_vib *vib = container_of(dev, struct qpnp_vib,
					 timed_dev);

	mutex_lock(&vib->lock);
	hrtimer_cancel(&vib->vib_timer);

	if (value == 0)
		vib->state = 0;
	else {
		value = (value > vib->timeout ?
				 vib->timeout : value);
		vib->state = 1;
		hrtimer_start(&vib->vib_timer,
			      ktime_set(value / 1000, (value % 1000) * 1000000),
			      HRTIMER_MODE_REL);
	}
	mutex_unlock(&vib->lock);
	schedule_work(&vib->work);
}

static void qpnp_vib_update(struct work_struct *work)
{
	struct qpnp_vib *vib = container_of(work, struct qpnp_vib,
					 work);
	qpnp_vib_set(vib, vib->state);
}

static int qpnp_vib_get_time(struct timed_output_dev *dev)
{
	struct qpnp_vib *vib = container_of(dev, struct qpnp_vib,
							 timed_dev);

	if (hrtimer_active(&vib->vib_timer)) {
		ktime_t r = hrtimer_get_remaining(&vib->vib_timer);
		return (int)ktime_to_us(r);
	} else
		return 0;
}

static enum hrtimer_restart qpnp_vib_timer_func(struct hrtimer *timer)
{
	struct qpnp_vib *vib = container_of(timer, struct qpnp_vib,
							 vib_timer);

	vib->state = 0;
	schedule_work(&vib->work);

	return HRTIMER_NORESTART;
}

#ifdef CONFIG_PM
static int qpnp_vibrator_suspend(struct device *dev)
{
	struct qpnp_vib *vib = dev_get_drvdata(dev);

	hrtimer_cancel(&vib->vib_timer);
	cancel_work_sync(&vib->work);
	/* turn-off vibrator */
	qpnp_vib_set(vib, 0);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(qpnp_vibrator_pm_ops, qpnp_vibrator_suspend, NULL);

static int __devinit qpnp_vibrator_probe(struct spmi_device *spmi)
{
	struct qpnp_vib *vib;
	struct resource *vib_resource;
	int rc;
	u8 val;
	u32 temp_val;

	vib = devm_kzalloc(&spmi->dev, sizeof(*vib), GFP_KERNEL);
	if (!vib)
		return -ENOMEM;

	vib->spmi = spmi;

	vib->timeout = QPNP_VIB_DEFAULT_TIMEOUT;
	rc = of_property_read_u32(spmi->dev.of_node,
			"qcom,vib-timeout-ms", &temp_val);
	if (!rc) {
		vib->timeout = temp_val;
	} else if (rc != EINVAL) {
		dev_err(&spmi->dev, "Unable to read vib timeout\n");
		return rc;
	}

	vib->vtg_level = QPNP_VIB_DEFAULT_VTG_LVL;
	rc = of_property_read_u32(spmi->dev.of_node,
			"qcom,vib-vtg-level-mV", &temp_val);
	if (!rc) {
		vib->vtg_level = temp_val;
	} else if (rc != -EINVAL) {
		dev_err(&spmi->dev, "Unable to read vtg level\n");
		return rc;
	}

	vib->vtg_level /= 100;

	vib_resource = spmi_get_resource(spmi, 0, IORESOURCE_MEM, 0);
	if (!vib_resource) {
		dev_err(&spmi->dev, "Unable to get vibrator base address\n");
		return -EINVAL;
	}
	vib->base = vib_resource->start;

	/* save the control registers values */
	rc = qpnp_vib_read_u8(vib, &val, QPNP_VIB_VTG_CTL(vib->base));
	if (rc < 0)
		return rc;
	vib->reg_vtg_ctl = val;

	rc = qpnp_vib_read_u8(vib, &val, QPNP_VIB_EN_CTL(vib->base));
	if (rc < 0)
		return rc;
	vib->reg_en_ctl = val;

	mutex_init(&vib->lock);
	INIT_WORK(&vib->work, qpnp_vib_update);

	hrtimer_init(&vib->vib_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
	vib->vib_timer.function = qpnp_vib_timer_func;

	vib->timed_dev.name = "vibrator";
	vib->timed_dev.get_time = qpnp_vib_get_time;
	vib->timed_dev.enable = qpnp_vib_enable;

	dev_set_drvdata(&spmi->dev, vib);

	rc = timed_output_dev_register(&vib->timed_dev);
	if (rc < 0)
		return rc;

	vib_dev = vib;

	return rc;
}

static int  __devexit qpnp_vibrator_remove(struct spmi_device *spmi)
{
	struct qpnp_vib *vib = dev_get_drvdata(&spmi->dev);

	cancel_work_sync(&vib->work);
	hrtimer_cancel(&vib->vib_timer);
	timed_output_dev_unregister(&vib->timed_dev);
	mutex_destroy(&vib->lock);

	return 0;
}

static struct of_device_id spmi_match_table[] = {
	{	.compatible = "qcom,qpnp-vibrator",
	},
	{}
};

static struct spmi_driver qpnp_vibrator_driver = {
	.driver		= {
		.name	= "qcom,qpnp-vibrator",
		.of_match_table = spmi_match_table,
		.pm	= &qpnp_vibrator_pm_ops,
	},
	.probe		= qpnp_vibrator_probe,
	.remove		= __devexit_p(qpnp_vibrator_remove),
};

static int __init qpnp_vibrator_init(void)
{
	return spmi_driver_register(&qpnp_vibrator_driver);
}
module_init(qpnp_vibrator_init);

static void __exit qpnp_vibrator_exit(void)
{
	return spmi_driver_unregister(&qpnp_vibrator_driver);
}
module_exit(qpnp_vibrator_exit);

MODULE_DESCRIPTION("qpnp vibrator driver");
MODULE_LICENSE("GPL v2");

#ifndef __QPNP_VIBRATOR_H__
#define __QPNP_VIBRATOR_H__

enum qpnp_vib_en_mode {
	QPNP_VIB_MANUAL,
	QPNP_VIB_DTEST1,
	QPNP_VIB_DTEST2,
	QPNP_VIB_DTEST3,
};

struct qpnp_vib_config {
	u16			drive_mV;
	u8			active_low;
	enum qpnp_vib_en_mode	enable_mode;
};
#if defined(CONFIG_QPNP_VIBRATOR)

int qpnp_vibrator_config(struct qpnp_vib_config *vib_config);
#else

static inline int qpnp_vibrator_config(struct qpnp_vib_config *vib_config)
{
	return -ENODEV;
}
#endif

#endif /* __QPNP_VIBRATOR_H__ */

# Copyright 2006 The Android Open Source Project

LOCAL_SRC_FILES += vibrator/vibrator.c

/*
 * Copyright (C) 2008 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.
 */

#ifndef _HARDWARE_VIBRATOR_H
#define _HARDWARE_VIBRATOR_H

#if __cplusplus
extern "C" {
#endif

/**
 * Return whether the device has a vibrator.
 *
 * @return 1 if a vibrator exists, 0 if it doesn't.
 */
int vibrator_exists();

/**
 * Turn on vibrator
 *
 * @param timeout_ms number of milliseconds to vibrate
 *
 * @return 0 if successful, -1 if error
 */
int vibrator_on(int timeout_ms);

/**
 * Turn off vibrator
 *
 * @return 0 if successful, -1 if error
 */
int vibrator_off();

#if __cplusplus
}  // extern "C"
#endif

#endif  // _HARDWARE_VIBRATOR_H

#include <hardware_legacy/vibrator.h>
#include "qemu.h"

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>

#define THE_DEVICE "/sys/class/timed_output/vibrator/enable"

int vibrator_exists()
{
    int fd;

#ifdef QEMU_HARDWARE
    if (qemu_check()) {
        return 1;
    }
#endif

    fd = open(THE_DEVICE, O_RDWR);
    if(fd < 0)
        return 0;
    close(fd);
    return 1;
}

static int sendit(int timeout_ms)
{
    int nwr, ret, fd;
    char value[20];

#ifdef QEMU_HARDWARE
    if (qemu_check()) {
        return qemu_control_command( "vibrator:%d", timeout_ms );
    }
#endif

    fd = open(THE_DEVICE, O_RDWR);
    if(fd < 0)
        return errno;

    nwr = sprintf(value, "%d\n", timeout_ms);
    ret = write(fd, value, nwr);

    close(fd);

    return (ret == nwr) ? 0 : -1;
}

int vibrator_on(int timeout_ms)
{
    /* constant on, up to maximum allowed time */
    return sendit(timeout_ms);
}

int vibrator_off()
{
    return sendit(0);
}

#define LOG_TAG "VibratorService"

#include "jni.h"
#include "JNIHelp.h"
#include "android_runtime/AndroidRuntime.h"

#include <utils/misc.h>
#include <utils/Log.h>
#include <hardware_legacy/vibrator.h>

#include <stdio.h>

namespace android
{

static jboolean vibratorExists(JNIEnv *env, jobject clazz)
{
    return vibrator_exists() > 0 ? JNI_TRUE : JNI_FALSE;
}

static void vibratorOn(JNIEnv *env, jobject clazz, jlong timeout_ms)
{
    // ALOGI("vibratorOn\n");
    vibrator_on(timeout_ms);
}

static void vibratorOff(JNIEnv *env, jobject clazz)
{
    // ALOGI("vibratorOff\n");
    vibrator_off();
}

static JNINativeMethod method_table[] = {
    { "vibratorExists", "()Z", (void*)vibratorExists },
    { "vibratorOn", "(J)V", (void*)vibratorOn },
    { "vibratorOff", "()V", (void*)vibratorOff }
};

int register_android_server_VibratorService(JNIEnv *env)
{
    return jniRegisterNativeMethods(env, "com/android/server/VibratorService",
            method_table, NELEM(method_table));
}

};

/*
 * Copyright (C) 2008 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.
 */

package com.android.server;

import android.app.AppOpsManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.database.ContentObserver;
import android.hardware.input.InputManager;
import android.os.BatteryStats;
import android.os.Handler;
import android.os.IVibratorService;
import android.os.PowerManager;
import android.os.Process;
import android.os.RemoteException;
import android.os.IBinder;
import android.os.Binder;
import android.os.ServiceManager;
import android.os.SystemClock;
import android.os.UserHandle;
import android.os.Vibrator;
import android.os.WorkSource;
import android.provider.Settings;
import android.provider.Settings.SettingNotFoundException;
import android.util.Slog;
import android.view.InputDevice;

import com.android.internal.app.IAppOpsService;
import com.android.internal.app.IBatteryStats;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.ListIterator;

public class VibratorService extends IVibratorService.Stub
        implements InputManager.InputDeviceListener {
    private static final String TAG = "VibratorService";

    private final LinkedList<Vibration> mVibrations;
    private Vibration mCurrentVibration;
    private final WorkSource mTmpWorkSource = new WorkSource();
    private final Handler mH = new Handler();

    private final Context mContext;
    private final PowerManager.WakeLock mWakeLock;
    private final IAppOpsService mAppOpsService;
    private final IBatteryStats mBatteryStatsService;
    private InputManager mIm;

    volatile VibrateThread mThread;

    // mInputDeviceVibrators lock should be acquired after mVibrations lock, if both are
    // to be acquired
    private final ArrayList<Vibrator> mInputDeviceVibrators = new ArrayList<Vibrator>();
    private boolean mVibrateInputDevicesSetting; // guarded by mInputDeviceVibrators
    private boolean mInputDeviceListenerRegistered; // guarded by mInputDeviceVibrators

    private int mCurVibUid = -1;

    native static boolean vibratorExists();
    native static void vibratorOn(long milliseconds);
    native static void vibratorOff();

    private class Vibration implements IBinder.DeathRecipient {
        private final IBinder mToken;
        private final long    mTimeout;
        private final long    mStartTime;
        private final long[]  mPattern;
        private final int     mRepeat;
        private final int     mUid;
        private final String  mPackageName;

        Vibration(IBinder token, long millis, int uid, String packageName) {
            this(token, millis, null, 0, uid, packageName);
        }

        Vibration(IBinder token, long[] pattern, int repeat, int uid, String packageName) {
            this(token, 0, pattern, repeat, uid, packageName);
        }

        private Vibration(IBinder token, long millis, long[] pattern,
                int repeat, int uid, String packageName) {
            mToken = token;
            mTimeout = millis;
            mStartTime = SystemClock.uptimeMillis();
            mPattern = pattern;
            mRepeat = repeat;
            mUid = uid;
            mPackageName = packageName;
        }

        public void binderDied() {
            synchronized (mVibrations) {
                mVibrations.remove(this);
                if (this == mCurrentVibration) {
                    doCancelVibrateLocked();
                    startNextVibrationLocked();
                }
            }
        }

        public boolean hasLongerTimeout(long millis) {
            if (mTimeout == 0) {
                // This is a pattern, return false to play the simple
                // vibration.
                return false;
            }
            if ((mStartTime + mTimeout)
                    < (SystemClock.uptimeMillis() + millis)) {
                // If this vibration will end before the time passed in, let
                // the new vibration play.
                return false;
            }
            return true;
        }
    }

    VibratorService(Context context) {
        // Reset the hardware to a default state, in case this is a runtime
        // restart instead of a fresh boot.
        vibratorOff();

        mContext = context;
        PowerManager pm = (PowerManager)context.getSystemService(
                Context.POWER_SERVICE);
        mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "*vibrator*");
        mWakeLock.setReferenceCounted(true);

        mAppOpsService = IAppOpsService.Stub.asInterface(ServiceManager.getService(Context.APP_OPS_SERVICE));
        mBatteryStatsService = IBatteryStats.Stub.asInterface(ServiceManager.getService(
                BatteryStats.SERVICE_NAME));

        mVibrations = new LinkedList<Vibration>();

        IntentFilter filter = new IntentFilter();
        filter.addAction(Intent.ACTION_SCREEN_OFF);
        context.registerReceiver(mIntentReceiver, filter);
    }

    public void systemReady() {
        mIm = (InputManager)mContext.getSystemService(Context.INPUT_SERVICE);

        mContext.getContentResolver().registerContentObserver(
                Settings.System.getUriFor(Settings.System.VIBRATE_INPUT_DEVICES), true,
                new ContentObserver(mH) {
                    @Override
                    public void onChange(boolean selfChange) {
                        updateInputDeviceVibrators();
                    }
                }, UserHandle.USER_ALL);

        mContext.registerReceiver(new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                updateInputDeviceVibrators();
            }
        }, new IntentFilter(Intent.ACTION_USER_SWITCHED), null, mH);

        updateInputDeviceVibrators();
    }

    public boolean hasVibrator() {
        return doVibratorExists();
    }

    private void verifyIncomingUid(int uid) {
        if (uid == Binder.getCallingUid()) {
            return;
        }
        if (Binder.getCallingPid() == Process.myPid()) {
            return;
        }
        mContext.enforcePermission(android.Manifest.permission.UPDATE_APP_OPS_STATS,
                Binder.getCallingPid(), Binder.getCallingUid(), null);
    }

    public void vibrate(int uid, String packageName, long milliseconds, IBinder token) {
        if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.VIBRATE)
                != PackageManager.PERMISSION_GRANTED) {
            throw new SecurityException("Requires VIBRATE permission");
        }
        verifyIncomingUid(uid);
        // We're running in the system server so we cannot crash. Check for a
        // timeout of 0 or negative. This will ensure that a vibration has
        // either a timeout of > 0 or a non-null pattern.
        if (milliseconds <= 0 || (mCurrentVibration != null
                && mCurrentVibration.hasLongerTimeout(milliseconds))) {
            // Ignore this vibration since the current vibration will play for
            // longer than milliseconds.
            return;
        }

        Vibration vib = new Vibration(token, milliseconds, uid, packageName);

        final long ident = Binder.clearCallingIdentity();
        try {
            synchronized (mVibrations) {
                removeVibrationLocked(token);
                doCancelVibrateLocked();
                mCurrentVibration = vib;
                startVibrationLocked(vib);
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    private boolean isAll0(long[] pattern) {
        int N = pattern.length;
        for (int i = 0; i < N; i++) {
            if (pattern[i] != 0) {
                return false;
            }
        }
        return true;
    }

    public void vibratePattern(int uid, String packageName, long[] pattern, int repeat,
            IBinder token) {
        if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.VIBRATE)
                != PackageManager.PERMISSION_GRANTED) {
            throw new SecurityException("Requires VIBRATE permission");
        }
        verifyIncomingUid(uid);
        // so wakelock calls will succeed
        long identity = Binder.clearCallingIdentity();
        try {
            if (false) {
                String s = "";
                int N = pattern.length;
                for (int i=0; i<N; i++) {
                    s += " " + pattern[i];
                }
                Slog.i(TAG, "vibrating with pattern: " + s);
            }

            // we're running in the server so we can't fail
            if (pattern == null || pattern.length == 0
                    || isAll0(pattern)
                    || repeat >= pattern.length || token == null) {
                return;
            }

            Vibration vib = new Vibration(token, pattern, repeat, uid, packageName);
            try {
                token.linkToDeath(vib, 0);
            } catch (RemoteException e) {
                return;
            }

            synchronized (mVibrations) {
                removeVibrationLocked(token);
                doCancelVibrateLocked();
                if (repeat >= 0) {
                    mVibrations.addFirst(vib);
                    startNextVibrationLocked();
                } else {
                    // A negative repeat means that this pattern is not meant
                    // to repeat. Treat it like a simple vibration.
                    mCurrentVibration = vib;
                    startVibrationLocked(vib);
                }
            }
        }
        finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    public void cancelVibrate(IBinder token) {
        mContext.enforceCallingOrSelfPermission(
                android.Manifest.permission.VIBRATE,
                "cancelVibrate");

        // so wakelock calls will succeed
        long identity = Binder.clearCallingIdentity();
        try {
            synchronized (mVibrations) {
                final Vibration vib = removeVibrationLocked(token);
                if (vib == mCurrentVibration) {
                    doCancelVibrateLocked();
                    startNextVibrationLocked();
                }
            }
        }
        finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    private final Runnable mVibrationRunnable = new Runnable() {
        public void run() {
            synchronized (mVibrations) {
                doCancelVibrateLocked();
                startNextVibrationLocked();
            }
        }
    };

    // Lock held on mVibrations
    private void doCancelVibrateLocked() {
        if (mThread != null) {
            synchronized (mThread) {
                mThread.mDone = true;
                mThread.notify();
            }
            mThread = null;
        }
        doVibratorOff();
        mH.removeCallbacks(mVibrationRunnable);
        reportFinishVibrationLocked();
    }

    // Lock held on mVibrations
    private void startNextVibrationLocked() {
        if (mVibrations.size() <= 0) {
            reportFinishVibrationLocked();
            mCurrentVibration = null;
            return;
        }
        mCurrentVibration = mVibrations.getFirst();
        startVibrationLocked(mCurrentVibration);
    }

    // Lock held on mVibrations
    private void startVibrationLocked(final Vibration vib) {
        try {
            int mode = mAppOpsService.startOperation(AppOpsManager.getToken(mAppOpsService),
                    AppOpsManager.OP_VIBRATE, vib.mUid, vib.mPackageName);
            if (mode != AppOpsManager.MODE_ALLOWED) {
                if (mode == AppOpsManager.MODE_ERRORED) {
                    Slog.w(TAG, "Would be an error: vibrate from uid " + vib.mUid);
                }
                mH.post(mVibrationRunnable);
                return;
            }
        } catch (RemoteException e) {
        }
        if (vib.mTimeout != 0) {
            doVibratorOn(vib.mTimeout, vib.mUid);
            mH.postDelayed(mVibrationRunnable, vib.mTimeout);
        } else {
            // mThread better be null here. doCancelVibrate should always be
            // called before startNextVibrationLocked or startVibrationLocked.
            mThread = new VibrateThread(vib);
            mThread.start();
        }
    }

    private void reportFinishVibrationLocked() {
        if (mCurrentVibration != null) {
            try {
                mAppOpsService.finishOperation(AppOpsManager.getToken(mAppOpsService),
                        AppOpsManager.OP_VIBRATE, mCurrentVibration.mUid,
                        mCurrentVibration.mPackageName);
            } catch (RemoteException e) {
            }
            mCurrentVibration = null;
        }
    }

    // Lock held on mVibrations
    private Vibration removeVibrationLocked(IBinder token) {
        ListIterator<Vibration> iter = mVibrations.listIterator(0);
        while (iter.hasNext()) {
            Vibration vib = iter.next();
            if (vib.mToken == token) {
                iter.remove();
                unlinkVibration(vib);
                return vib;
            }
        }
        // We might be looking for a simple vibration which is only stored in
        // mCurrentVibration.
        if (mCurrentVibration != null && mCurrentVibration.mToken == token) {
            unlinkVibration(mCurrentVibration);
            return mCurrentVibration;
        }
        return null;
    }

    private void unlinkVibration(Vibration vib) {
        if (vib.mPattern != null) {
            // If Vibration object has a pattern,
            // the Vibration object has also been linkedToDeath.
            vib.mToken.unlinkToDeath(vib, 0);
        }
    }

    private void updateInputDeviceVibrators() {
        synchronized (mVibrations) {
            doCancelVibrateLocked();

            synchronized (mInputDeviceVibrators) {
                mVibrateInputDevicesSetting = false;
                try {
                    mVibrateInputDevicesSetting = Settings.System.getIntForUser(
                            mContext.getContentResolver(),
                            Settings.System.VIBRATE_INPUT_DEVICES, UserHandle.USER_CURRENT) > 0;
                } catch (SettingNotFoundException snfe) {
                }

                if (mVibrateInputDevicesSetting) {
                    if (!mInputDeviceListenerRegistered) {
                        mInputDeviceListenerRegistered = true;
                        mIm.registerInputDeviceListener(this, mH);
                    }
                } else {
                    if (mInputDeviceListenerRegistered) {
                        mInputDeviceListenerRegistered = false;
                        mIm.unregisterInputDeviceListener(this);
                    }
                }

                mInputDeviceVibrators.clear();
                if (mVibrateInputDevicesSetting) {
                    int[] ids = mIm.getInputDeviceIds();
                    for (int i = 0; i < ids.length; i++) {
                        InputDevice device = mIm.getInputDevice(ids[i]);
                        Vibrator vibrator = device.getVibrator();
                        if (vibrator.hasVibrator()) {
                            mInputDeviceVibrators.add(vibrator);
                        }
                    }
                }
            }

            startNextVibrationLocked();
        }
    }

    @Override
    public void onInputDeviceAdded(int deviceId) {
        updateInputDeviceVibrators();
    }

    @Override
    public void onInputDeviceChanged(int deviceId) {
        updateInputDeviceVibrators();
    }

    @Override
    public void onInputDeviceRemoved(int deviceId) {
        updateInputDeviceVibrators();
    }

    private boolean doVibratorExists() {
        // For now, we choose to ignore the presence of input devices that have vibrators
        // when reporting whether the device has a vibrator.  Applications often use this
        // information to decide whether to enable certain features so they expect the
        // result of hasVibrator() to be constant.  For now, just report whether
        // the device has a built-in vibrator.
        //synchronized (mInputDeviceVibrators) {
        //    return !mInputDeviceVibrators.isEmpty() || vibratorExists();
        //}
        return vibratorExists();
    }

    private void doVibratorOn(long millis, int uid) {
        synchronized (mInputDeviceVibrators) {
            try {
                mBatteryStatsService.noteVibratorOn(uid, millis);
                mCurVibUid = uid;
            } catch (RemoteException e) {
            }
            final int vibratorCount = mInputDeviceVibrators.size();
            if (vibratorCount != 0) {
                for (int i = 0; i < vibratorCount; i++) {
                    mInputDeviceVibrators.get(i).vibrate(millis);
                }
            } else {
                vibratorOn(millis);
            }
        }
    }

    private void doVibratorOff() {
        synchronized (mInputDeviceVibrators) {
            if (mCurVibUid >= 0) {
                try {
                    mBatteryStatsService.noteVibratorOff(mCurVibUid);
                } catch (RemoteException e) {
                }
                mCurVibUid = -1;
            }
            final int vibratorCount = mInputDeviceVibrators.size();
            if (vibratorCount != 0) {
                for (int i = 0; i < vibratorCount; i++) {
                    mInputDeviceVibrators.get(i).cancel();
                }
            } else {
                vibratorOff();
            }
        }
    }

    private class VibrateThread extends Thread {
        final Vibration mVibration;
        boolean mDone;

        VibrateThread(Vibration vib) {
            mVibration = vib;
            mTmpWorkSource.set(vib.mUid);
            mWakeLock.setWorkSource(mTmpWorkSource);
            mWakeLock.acquire();
        }

        private void delay(long duration) {
            if (duration > 0) {
                long bedtime = duration + SystemClock.uptimeMillis();
                do {
                    try {
                        this.wait(duration);
                    }
                    catch (InterruptedException e) {
                    }
                    if (mDone) {
                        break;
                    }
                    duration = bedtime - SystemClock.uptimeMillis();
                } while (duration > 0);
            }
        }

        public void run() {
            Process.setThreadPriority(Process.THREAD_PRIORITY_URGENT_DISPLAY);
            synchronized (this) {
                final long[] pattern = mVibration.mPattern;
                final int len = pattern.length;
                final int repeat = mVibration.mRepeat;
                final int uid = mVibration.mUid;
                int index = 0;
                long duration = 0;

                while (!mDone) {
                    // add off-time duration to any accumulated on-time duration
                    if (index < len) {
                        duration += pattern[index++];
                    }

                    // sleep until it is time to start the vibrator
                    delay(duration);
                    if (mDone) {
                        break;
                    }

                    if (index < len) {
                        // read on-time duration and start the vibrator
                        // duration is saved for delay() at top of loop
                        duration = pattern[index++];
                        if (duration > 0) {
                            VibratorService.this.doVibratorOn(duration, uid);
                        }
                    } else {
                        if (repeat < 0) {
                            break;
                        } else {
                            index = repeat;
                            duration = 0;
                        }
                    }
                }
                mWakeLock.release();
            }
            synchronized (mVibrations) {
                if (mThread == this) {
                    mThread = null;
                }
                if (!mDone) {
                    // If this vibration finished naturally, start the next
                    // vibration.
                    mVibrations.remove(mVibration);
                    unlinkVibration(mVibration);
                    startNextVibrationLocked();
                }
            }
        }
    };

    BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
                synchronized (mVibrations) {
                    doCancelVibrateLocked();

                    int size = mVibrations.size();
                    for(int i = 0; i < size; i++) {
                        unlinkVibration(mVibrations.get(i));
                    }

                    mVibrations.clear();
                }
            }
        }
    };
}

package android.os;                                                                    
                                                                                   
/** {@hide} */                                                                         
interface IVibratorService                                                             
{                                                                                      
		boolean hasVibrator();                                                             
		void vibrate(int uid, String packageName, long milliseconds, IBinder token);       
		void vibratePattern(int uid, String packageName, in long[] pattern, int repeat, IBinder token);
		void cancelVibrate(IBinder token);                                                 
}    

private IVibratorService mVibratorService = null;

mVibratorService.vibrate(Process.myUid(), null, 2000, new Binder());
mVibratorService.cancelVibrate(new Binder());

    用户空间程序开发时LOG的使用。Android系统在用户空间中提供了轻量级的logger日志系统，它是在内核中实现的一种设备驱动，与用户空间的logcat工具配合使用能够方便地跟踪调试程序。在Android系统中，分别为C/C++ 和Java语言提供两种不同的logger访问接口。C/C++日志接口一般是在编写硬件抽象层模块或者编写JNI方法时使用，而Java接口一般是在应用层编写APP时使用。

    private static final String LOG_TAG = "MY_LOG_TAG";
    Log.i(LOG_TAG, "This is the log printed by Log.i in android user space.");

   kernel/common/drivers/staging/android/logger.h
   kernel/common/drivers/staging/android/logger.c