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input 输入子系统

在应用层使用的时候，容易出现找不到UEventObserver.java 这时候就要导入jar包

weiqifa@weiqifa-Inspiron-3847:~/weiqifa/tm100$ ls out/target/common/obj/JAVA_LIBRARIES/framework_intermediates/classes  classes.dex  classes-full-debug.jar  classes.jar  classes-jarjar.jar  emma_out  javalib.jar  noproguard.classes.jar  noproguard.classes-with-local.dexweiqifa@weiqifa-Inspiron-3847:~/weiqifa/tm100$

问题：最近我自己比较了这两个的作用，我们以前经常用这个来获取底层上报的值，用来做usb插入，键盘输入等

区别： input 如果上报的值是1 ,在framework里面就一直获取这个键值，这个是按键的特性

D/WindowManager(  632): interceptKeyTi keyCode=42 down=true repeatCount=1427 keyguardOn=true mHomePressed=false canceled=false metaState:0D/WindowManager(  632): interceptKeyTi keyCode=42 down=true repeatCount=1428 keyguardOn=true mHomePressed=false canceled=false metaState:0D/WindowManager(  632): interceptKeyTi keyCode=42 down=true repeatCount=1429 keyguardOn=true mHomePressed=false canceled=false metaState:0D/WindowManager(  632): interceptKeyTi keyCode=42 down=true repeatCount=1430 keyguardOn=true mHomePressed=false canceled=false metaState:0D/WindowManager(  632): interceptKeyTi keyCode=42 down=true repeatCount=1431 keyguardOn=true mHomePressed=false canceled=false metaState:0

linux uevent

这个就是比input区别在于输入的时候不会一直上报1,使用也比较方便

底层发送的关键代码

char *envp[2];    int ret;    if(work_flag==true)    {        envp[0]="CAMERA=close";        envp[1]=NULL;        //关键是kobj这个kobj 要从生成dev的地方去找到        ret = kobject_uevent_env(&hdyrodent_hall_class_dev->kobj, KOBJ_CHANGE,envp);        if(ret<0){            printk("%s kobject error\n",__func__);          }else{            printk("%s kobject uevent report close success!!!\n",__func__);             }           printk("------------>%s<------------%s\n",__FUNCTION__,kobject_get_path(&hdyrodent_hall_class_dev->kobj,GFP_KERNEL));    }

Android接收

//weiqifa modify for the hall uevent    private UEventObserver mHALLObserver = new UEventObserver() {        @Override        public void onUEvent(UEventObserver.UEvent event) {            String camera = event.get("CAMERA");            Slog.d(TAG, "------------------------------->camera=" + camera);            if("open".equals(event.get("CAMERA"))){ //磁铁离开的时候这时候应该是打开摄像头的时候                Slog.d(TAG, "------------------------------->Open the camera app!!!!=" + camera);                Intent intent = new Intent("com.key.android.KEY_CAMERA_OPEN");                mContext.sendBroadcast(intent);                startAPP("com.android.gallery3d");            }else if("close".equals(event.get("CAMERA"))){
  //磁铁接触的时候就会一直发送down 过来 这时候应该是关闭摄像头的                Slog.d(TAG, "------------------------------->Close the camera app!!!!=" + camera);                Intent intent = new Intent("com.key.android.KEY_CAMERA_CLOSE");                mContext.sendBroadcast(intent);                stopAPP("com.android.gallery3d");                WriteInt("/sys/class/hdyrodent/cameraflash",0);//关闭闪光灯            }                   }    };

然后再找个地方运行一下这句代码

//weiqifa modify add         mHALLObserver.startObserving("DEVPATH=/devices/virtual/hdyrodent_hall_class/hdyrodent_hall");

/devices/virtual/hdyrodent_hall_class/hdyrodent_hall 这个是我们在驱动下面生成的，驱动上报的时候我用个函数把它打印出来了，前面的DEVPATH=这个是一定要加的。

然后我还是写一下这个目录是怎么来的，看下面的代码

//weiqifa modify for hall    hdyrodent_hall_class = class_create(THIS_MODULE,"hdyrodent_hall_class");    if (IS_ERR(hdyrodent_hall_class)) {               pr_err("%s: class_create() failed hdyrodent_hall_class\n", __func__);            class_destroy(hdyrodent_hall_class);    }    //add device to class     hdyrodent_hall_class_dev = device_create(hdyrodent_hall_class, NULL,                  hdyrodent_hall_device_no, NULL, "hdyrodent_hall");    if (!hdyrodent_hall_class_dev) {        pr_err("%s: class_device_create failed hdyrodent_hall \n", __func__);        device_destroy(hdyrodent_hall_class, hdyrodent_hall_device_no);    }//weiqifa modify for hall end

底层例子

/* * drivers/leds/leds-mt65xx.c * * This file is subject to the terms and conditions of the GNU General Public * License.  See the file COPYING in the main directory of this archive for * more details. * * Hydrodent weiqifa modify add * */#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        #include 
        
         #include 
         
          #include 
          
           #include 
           
            #include "cust_gpio_usage.h"#include 
            
             #include 
             
              extern void mt_eint_unmask(unsigned int eint_num);extern void mt_eint_set_polarity(unsigned int eint_num, unsigned int pol);extern void mt_eint_set_hw_debounce(unsigned int eintno, unsigned int ms);extern unsigned int mt_eint_set_sens(unsigned int eintno, unsigned int sens);extern void mt_eint_registration(unsigned int eint_num, unsigned int flag, void (EINT_FUNC_PTR) (void), unsigned int is_auto_umask);//struct input_dev *hdy_input_dev;static struct class *hdyrodent_hall_class = NULL;//weiqifa modify addstatic dev_t hdyrodent_hall_device_no;//weiqifa modify addstruct device *hdyrodent_hall_class_dev;//weiqifa modify addstruct work_struct hall_work;struct workqueue_struct *hall_wq;static bool work_flag=false;void hall_func(struct work_struct *work){ char *envp[2]; int ret; if(work_flag==true) { envp[0]="CAMERA=close"; envp[1]=NULL; ret = kobject_uevent_env(&hdyrodent_hall_class_dev->kobj, KOBJ_CHANGE,envp); if(ret<0){ printk("%s kobject error\n",__func__); }else{ printk("%s kobject uevent report close success!!!\n",__func__); } printk("------------>%s<------------%s\n",__FUNCTION__,kobject_get_path(&hdyrodent_hall_class_dev->kobj,GFP_KERNEL)); } else if(work_flag==false) { envp[0]="CAMERA=open"; envp[1]=NULL; ret = kobject_uevent_env(&hdyrodent_hall_class_dev->kobj, KOBJ_CHANGE,envp); if(ret<0){ printk("%s kobject error\n",__func__); }else{ printk("%s kobject uevent report open success!!!\n",__func__); } printk("------------>%s<------------%s\n",__FUNCTION__,kobject_get_path(&hdyrodent_hall_class_dev->kobj,GFP_KERNEL)); } }//中断服务函数void hal_eint_interrupt_handler(void){ char *envp[2]; int ret; printk("------------>%s<------------ GPIO_MHALL_EINT_PIN value=%d\n",__FUNCTION__,mt_get_gpio_in(GPIO_MHALL_EINT_PIN)); /*设置中断触发方式，打开摄像头后产生了一次中断，然后改变中断触发方式，关闭摄像头后又会产生一次关闭摄像头的中断*/ if(mt_get_gpio_in(GPIO_MHALL_EINT_PIN)) { mt_eint_set_polarity(CUST_EINT_MHALL_NUM, MT_EINT_POL_NEG);//中断触发方式设置成下降沿 关闭摄像头 queue_work(hall_wq, &hall_work); work_flag=false; } else { mt_eint_set_polarity(CUST_EINT_MHALL_NUM, MT_EINT_POL_POS);//中断触发方式设置成上升沿 打开摄像头 queue_work(hall_wq, &hall_work); work_flag=true; } mt_eint_unmask(CUST_EINT_MHALL_NUM); }static int __init hdyrodent_hall_init(void){ int err = -1; //int r=0; hall_wq=create_workqueue("hall_wq"); printk("%s mhall_pin value=%d start\n",__FUNCTION__,mt_get_gpio_in(GPIO_MHALL_EINT_PIN));//weiqifa modify for hall hdyrodent_hall_class = class_create(THIS_MODULE,"hdyrodent_hall_class"); if (IS_ERR(hdyrodent_hall_class)) { pr_err("%s: class_create() failed hdyrodent_hall_class\n", __func__); class_destroy(hdyrodent_hall_class); } //add device to class hdyrodent_hall_class_dev = device_create(hdyrodent_hall_class, NULL, hdyrodent_hall_device_no, NULL, "hdyrodent_hall"); if (!hdyrodent_hall_class_dev) { pr_err("%s: class_device_create failed hdyrodent_hall \n", __func__); device_destroy(hdyrodent_hall_class, hdyrodent_hall_device_no); }//weiqifa modify for hall end //霍尔开关电源控制 if(hwPowerOn(MT6323_POWER_LDO_VIBR, VOL_2800, "VIBR")) { printk("Success: open the MT65XX_POWER_LDO_VIBR 2.8V\n"); } //Init the irq gpio1_interrupt mt_set_gpio_mode(GPIO_MHALL_EINT_PIN, GPIO_MHALL_EINT_PIN_M_EINT); mt_set_gpio_dir(GPIO_MHALL_EINT_PIN, GPIO_DIR_IN); mt_set_gpio_pull_enable(GPIO_MHALL_EINT_PIN, GPIO_PULL_ENABLE); mt_set_gpio_pull_select(GPIO_MHALL_EINT_PIN, GPIO_PULL_UP); msleep(50); /* mt_eint_set_hw_debounce 设置抖动 mt_eint_registration 第一个是中断号，触发极性，第二个是设定是否开启抖动，第三个是绑定中断函数，第四个关闭中断 mt_eint_unmask 屏蔽中断 */ mt_eint_set_hw_debounce(CUST_EINT_MHALL_NUM, CUST_EINT_MHALL_DEBOUNCE_CN); mt_eint_registration(CUST_EINT_MHALL_NUM, CUST_EINT_MHALL_TYPE, hal_eint_interrupt_handler, 0); mt_eint_unmask(CUST_EINT_MHALL_NUM); //工作队列 INIT_WORK(&hall_work, hall_func); printk("%s end\n", __FUNCTION__); return 0;}static void __exit hdyrodent_hall_exit(void){ class_destroy(hdyrodent_hall_class); device_destroy(hdyrodent_hall_class, hdyrodent_hall_device_no); printk("hdyrodent module cleanup OK!\n");}MODULE_AUTHOR("329410527@qq.com");MODULE_DESCRIPTION("HDYRODENT HALL MODULE");MODULE_LICENSE("GPL");MODULE_VERSION("ver0.1");module_init(hdyrodent_hall_init);module_exit(hdyrodent_hall_exit);
             
            
           
          
         
        
       
      
     
    
   

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