/************************************************************************
* I.MX6 shutdown by software
* 声明：
* 有时候我们的系统可能并没有像手机那样的开关机键，所以我么这个时候
* 需要提供软件关机功能，本文直接通过JNI操作设备节点进行控制，并没有采用
* STUB来控制，当然目前对这块的操作也不熟练。
*
* 2015-12-20 深圳 南山平山村 曾剑锋
***********************************************************************/
\\\\\\\\\\\\\\-*- 目录 -*-///////////////
| 一、参考文档：
| 二、修改按键驱动程序：
| 三、板级文件注册按键设备：
| 四、添加shutdown设备节点，便于控制：
| 五、关闭关机时的提示框：
| 六、关闭watchdog：
| 七、使用JNI进行测试：
| 八、JNI对应的Java文件：
----------------------------------------
一、参考文档：
Android开发 调用系统隐藏API
http://www.pocketdigi.com/20130519/1058.html
定做Android关机界面
http://233.io/article/1019041.html
Android下实现自动关机的方法总结
http://233.io/article/1019041.html
二、修改按键驱动程序：
cat drivers/input/keyboard/gpio_keys.c
......
//主要是为了能够指向input的设备，我们能够在自己函数里实现单独控制
struct input_dev *this_input;
......
/* 添加这个我们自己的函数，并声明为系统全局符号 */
void this_input_report_event(int mode)
{
unsigned int type = EV_KEY;
switch (mode) {
case 1 :
// for power off
input_event(this_input, type, KEY_POWER, 1);
input_sync(this_input);
msleep(2000);
input_event(this_input, type, KEY_POWER, 0);
input_sync(this_input);
break;
case 2 :
// for stand by
input_event(this_input, type, KEY_POWER, 1);
input_sync(this_input);
input_event(this_input, type, KEY_POWER, 0);
input_sync(this_input);
break;
case 3 :
// for stand by and wake up
input_event(this_input, type, KEY_POWER, 1);
input_sync(this_input);
input_event(this_input, type, KEY_POWER, 0);
input_sync(this_input);
input_event(this_input, type, KEY_POWER, 1);
input_sync(this_input);
input_event(this_input, type, KEY_POWER, 0);
input_sync(this_input);
break;
default:
break;
}
}
EXPORT_SYMBOL(this_input_report_event);
......
static int __devinit gpio_keys_probe(struct platform_device *pdev)
{
......
input = input_allocate_device();
this_input = input; //添加这一行，为了能向上发送按键事件
if (!ddata || !input) {
dev_err(dev, "failed to allocate state\n");
error = -ENOMEM;
goto fail1;
}
......
}
......
三、板级文件注册按键设备：
cat arch/arm/mach-mx6/board-mx6q_sabresd.c
......
//这里随意改的，只要不和其他引脚有冲突就行
#define SABRESD_POWER_OFF IMX_GPIO_NR(3, 29)
......
static struct gpio_keys_button new_sabresd_buttons[] = {
//GPIO_BUTTON(SABRESD_VOLUME_UP, KEY_VOLUMEUP, 1, "volume-up", 0, 1),
//GPIO_BUTTON(SABRESD_VOLUME_DN, KEY_VOLUMEDOWN, 1, "volume-down", 0, 1),
GPIO_BUTTON(SABRESD_POWER_OFF, KEY_POWER, 1, "power-key", 1, 1),
};
......
四、添加shutdown设备节点，便于控制：
cat drivers/input/keyboard/shutdown.c
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/gpio.h>
#include <linux/miscdevice.h>
/** switch case are in gpio_key.c */
#define THIS_INPUT_SHUTDOWN_SOFTWARE 1
#define THIS_INPUT_STANBY_SOFTWARE 2
#define THIS_INPUT_STANBY_AND_WAKEUP_SOFTWARE 3
extern void this_input_report_event(int mode);
static int shutdown_open(struct inode *inode, struct file *file)
{
return 0;
}
static int shutdown_close(struct inode *inode, struct file *file)
{
return 0;
}
static ssize_t shutdown_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
{
return 0;
}
long shutdown_ioctl(struct file * file, unsigned int cmd, unsigned long arg)
{
this_input_report_event(cmd);
}
struct file_operations shutdown_fops = {
.owner = THIS_MODULE,
.open = shutdown_open,
.release = shutdown_close,
.read = shutdown_read,
.unlocked_ioctl = shutdown_ioctl,
};
struct miscdevice shutdown_misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = "shutdown",
.fops = &shutdown_fops,
};
int __init shutdown_init(void)
{
int ret;
ret = misc_register(&shutdown_misc);
if(ret)
printk("register shutdown FAILED!\n");
return ret;
}
void __exit shutdown_exit(void)
{
misc_deregister(&shutdown_misc);
}
module_init(shutdown_init);
module_exit(shutdown_exit);
MODULE_LICENSE("GPL");
五、关闭关机时的提示框：
cat frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
......
public class PhoneWindowManager implements WindowManagerPolicy {
......
private final Runnable mPowerLongPress = new Runnable() {
@Override
public void run() {
// The context isn't read
if (mLongPressOnPowerBehavior < 0) {
mLongPressOnPowerBehavior = mContext.getResources().getInteger(
com.android.internal.R.integer.config_longPressOnPowerBehavior);
}
int resolvedBehavior = mLongPressOnPowerBehavior;
if (FactoryTest.isLongPressOnPowerOffEnabled()) {
resolvedBehavior = LONG_PRESS_POWER_SHUT_OFF_NO_CONFIRM;
}
switch (resolvedBehavior) {
case LONG_PRESS_POWER_NOTHING:
break;
case LONG_PRESS_POWER_GLOBAL_ACTIONS:
mPowerKeyHandled = true;
if (!performHapticFeedbackLw(null, HapticFeedbackConstants.LONG_PRESS, false)) {
performAuditoryFeedbackForAccessibilityIfNeed();
}
sendCloseSystemWindows(SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS);
//注释这一样
//showGlobalActionsDialog();
//添加这一行
mWindowManagerFuncs.shutdown(resolvedBehavior == LONG_PRESS_POWER_SHUT_OFF);
break;
case LONG_PRESS_POWER_SHUT_OFF:
case LONG_PRESS_POWER_SHUT_OFF_NO_CONFIRM:
mPowerKeyHandled = true;
performHapticFeedbackLw(null, HapticFeedbackConstants.LONG_PRESS, false);
sendCloseSystemWindows(SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS);
mWindowManagerFuncs.shutdown(resolvedBehavior == LONG_PRESS_POWER_SHUT_OFF);
break;
}
}
};
......
}
......
六、关闭watchdog：
cat drivers/watchdog/imx2_wdt.c
......
// 这里主要是I.MX6的watchdog是一旦打开，就不能关闭的，所以在这里想了个办法，堵住，看上去堵住了
static void imx2_wdt_shutdown(struct platform_device *pdev)
{
if (test_bit(IMX2_WDT_STATUS_STARTED, &imx2_wdt.status)) {
/* we are running, we need to delete the timer but will give
* max timeout before reboot will take place */
del_timer_sync(&imx2_wdt.timer);
//注释这两行
//imx2_wdt_set_timeout(IMX2_WDT_MAX_TIME);
//imx2_wdt_ping();
//添加这两行
printk("imx2_wdt_stop();");
imx2_wdt_stop();
//再次执行上面的流程，主要为因为有时候不是仅仅一次不是很稳定
del_timer_sync(&imx2_wdt.timer);
imx2_wdt_stop();
dev_crit(imx2_wdt_miscdev.parent,
"Device shutdown: Expect reboot!\n");
}
}
......
七、使用JNI进行测试：
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class com_android_shutdown_Shutdown */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "android/log.h"
#include <sys/reboot.h>
static const char *TAG="GPIO_SHUTDOWN";
#define LOGE(fmt, args...) __android_log_print(ANDROID_LOG_ERROR, TAG, fmt, ##args)
#define THIS_INPUT_SHUTDOWN_SOFTWARE 1
#define THIS_INPUT_STANBY_SOFTWARE 2
#define THIS_INPUT_STANBY_AND_WAKEUP_SOFTWARE 3
/*
* Class: com_android_shutdown_Shutdown
* Method: shutdown
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_com_android_shutdown_Shutdown_shutdown
(JNIEnv * env, jobject thiz) {
int fd = open("/dev/shutdown", O_RDWR);
if (fd < 0) {
perror("shutdown system faild.\n");
}
ioctl(fd, THIS_INPUT_SHUTDOWN_SOFTWARE, 0);
close(fd);
}
八、JNI对应的Java文件：
cat shutdown.java
package com.android.shutdown;
public class Shutdown {
native static public void shutdown();
static {
System.loadLibrary("shutdown");
}
}
