diff --git a/20_input/.vscode/c_cpp_properties.json b/20_input/.vscode/c_cpp_properties.json
new file mode 100644
index 0000000000000000000000000000000000000000..79c6d19a12c235b7345b1cdd14efbde03c2b4f75
--- /dev/null
+++ b/20_input/.vscode/c_cpp_properties.json
@@ -0,0 +1,50 @@
+{
+    "configurations": [
+        {
+            "name": "Linux",
+            "includePath": [
+                "../../../linux-imx-rel_imx_4.1.15_2.1.0_ga/include", 
+                "../../../linux-imx-rel_imx_4.1.15_2.1.0_ga/arch/arm/include", 
+                "../../../linux-imx-rel_imx_4.1.15_2.1.0_ga/arch/arm/include/generated",
+                "../../../linux-imx-rel_imx_4.1.15_2.1.0_ga/arch/arm/include/asm",
+                "../../../linux-imx-rel_imx_4.1.15_2.1.0_ga/drivers",
+                "${workspaceFolder}/**",
+                "${default}"
+            ],
+            "defines": ["__KERNEL__","__linux__"],
+            "compilerPath": "/usr/bin/gcc",
+            "cStandard": "c11",
+            "cppStandard": "c++17",
+            "intelliSenseMode": "linux-gcc-x64",
+            "browse": {
+                "path": [
+                    "${workspaceFolder}",
+                    "../../../linux-imx-rel_imx_4.1.15_2.1.0_ga/arch/arm/include", 
+                    "../../../linux-imx-rel_imx_4.1.15_2.1.0_ga/arch/arm/include/generated",
+                    "../../../linux-imx-rel_imx_4.1.15_2.1.0_ga/arch/arm/include/asm",
+                    "../../../linux-imx-rel_imx_4.1.15_2.1.0_ga/drivers",
+                    "${workspaceFolder}/**",
+                    "${default}"
+                ]
+              }
+        },
+        {
+            "name": "Win32",
+            "includePath": [
+                "../../../linux-imx-rel_imx_4.1.15_2.1.0_ga/include", 
+                "../../../linux-imx-rel_imx_4.1.15_2.1.0_ga/arch/arm/include", 
+                "../../../linux-imx-rel_imx_4.1.15_2.1.0_ga/arch/arm/include/generated",
+                "../../../linux-imx-rel_imx_4.1.15_2.1.0_ga/arch/arm/include/asm",
+                "../../../linux-imx-rel_imx_4.1.15_2.1.0_ga/drivers",
+                "${workspaceFolder}/**",
+                "${default}"
+            ],
+            "defines": ["__KERNEL__","__linux__"],
+            "compilerPath": "C:/Qt/Qt5.12.9/Tools/mingw730_64/bin/gcc.exe",
+            "cStandard": "c11",
+            "cppStandard": "c++17",
+            "intelliSenseMode": "windows-gcc-x64"
+        }
+    ],
+    "version": 4
+}
diff --git a/20_input/.vscode/settings.json b/20_input/.vscode/settings.json
new file mode 100644
index 0000000000000000000000000000000000000000..1a2a04ac7a2d6b080404235adcd34b94bc581cb4
--- /dev/null
+++ b/20_input/.vscode/settings.json
@@ -0,0 +1,21 @@
+{
+    "search.exclude": {
+        "**/node_modules": true,
+        "**/bower_components": true,
+        "**/*.o":true,
+        "**/*.su":true, 
+        "**/*.cmd":true,
+        "Documentation":true,      
+    },
+    "files.exclude": {
+        "**/.git": true,
+        "**/.svn": true,
+        "**/.hg": true,
+        "**/CVS": true,
+        "**/.DS_Store": true,  
+        "**/*.o":true,
+        "**/*.su":true, 
+        "**/*.cmd":true,
+        "Documentation":true, 
+    }
+}
\ No newline at end of file
diff --git a/20_input/Makefile b/20_input/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..6cac2dd391fea48c029d89c6067dd60870160201
--- /dev/null
+++ b/20_input/Makefile
@@ -0,0 +1,13 @@
+KERNELDIR := ../../../linux-imx-rel_imx_4.1.15_2.1.0_ga
+CURRENT_PATH := $(shell pwd)
+obj-m := keyinput.o
+
+build: kernel_modules
+
+kernel_modules:
+	$(MAKE) -C $(KERNELDIR) M=$(CURRENT_PATH) modules
+
+clean:
+	$(MAKE) -C $(KERNELDIR) M=$(CURRENT_PATH) clean
+
+
diff --git a/20_input/keyinput.c b/20_input/keyinput.c
new file mode 100644
index 0000000000000000000000000000000000000000..b7d9a800e1e6a773d2d0cfaf0070ba50733c9524
--- /dev/null
+++ b/20_input/keyinput.c
@@ -0,0 +1,155 @@
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/ide.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/gpio.h>
+#include <linux/cdev.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_gpio.h>
+#include <linux/of_irq.h>
+#include <asm/mach/map.h>
+#include <asm/string.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <linux/input.h>
+
+#define KEYINPUT_CNT  1   
+#define KEYINPUT_NAME "keyinput"    
+#define KEY0VALUE     0X01    
+#define INVAKEY       0XFF
+#define KEY_NUM       1
+
+struct irq_keydesc {
+    int gpio;                /* gpio */
+    int irqnum;              /* 中断号 */
+    unsigned char value;    /* 按键对应的值 */
+    char name[10];         /* 名字*/
+    irqreturn_t (*handler)(int, void *);   /* 中断服务函数*/
+};
+
+
+struct keyinput_dev
+{
+    dev_t devid;                /* 中断号 */
+    struct cdev cdev;           /* cdev */
+    struct class* class;        /* 类 */
+    struct device* device;
+    struct device_node* nd;
+    struct timer_list timer;         
+    struct irq_keydesc irqkeydesc; /* 案件描述组 */
+    unsigned char curkeynum;            /* 当前的按键号 */
+    struct input_dev* inputdev;    /* input结构体 */
+};
+
+struct keyinput_dev keyinputdev;
+
+
+void timer_function(unsigned long arg)
+{
+    unsigned char value;
+    unsigned char num;
+    struct irq_keydesc* keydesc;
+    struct keyinput_dev* dev = (struct keyinput_dev*)arg;
+
+    num = dev->curkeynum;
+    keydesc = &dev->irqkeydesc;
+    value = gpio_get_value(keydesc->gpio);
+
+    if (value == 0)
+    {
+        input_report_key(dev->inputdev, keydesc->value, 1);
+        input_sync(dev->inputdev);
+    }
+    else {       /* 按键松开 */
+        input_report_key(dev->inputdev, keydesc->value, 0);
+        input_sync(dev->inputdev);
+    }
+    
+}
+
+irqreturn_t key0_handler(int irq, void* dev_id)
+{
+    struct keyinput_dev *dev = (struct keyinput_dev *)dev_id;
+
+    dev->curkeynum = 0;
+    dev->timer.data = (volatile long)dev_id;
+    mod_timer(&dev->timer, jiffies + msecs_to_jiffies(10));
+    return IRQ_RETVAL(IRQ_HANDLED);
+}
+
+static void keyio_init(void)
+{
+    int  ret = 0;
+    keyinputdev.nd = of_find_node_by_path("/key");
+    if (keyinputdev.nd == NULL)
+    {
+        printk("key node not find!\r\n");
+        return -EINVAL;
+    }
+
+    keyinputdev.irqkeydesc.gpio = of_get_named_gpio(keyinputdev.nd, "key-gpio", 0);
+    if (keyinputdev.irqkeydesc.gpio < 0)
+    {
+        printk("can't get key0");
+    }
+
+    /* 初始化key所使用的IO，并且设置成中断模式 */
+    memset(keyinputdev.irqkeydesc.name, 0, sizeof(keyinputdev.irqkeydesc.name));
+    sprintf(keyinputdev.irqkeydesc.name, "key0");
+    gpio_request(keyinputdev.irqkeydesc.gpio, keyinputdev.irqkeydesc.name);
+    gpio_direction_input(keyinputdev.irqkeydesc.gpio);
+    keyinputdev.irqkeydesc.irqnum = irq_of_parse_and_map(keyinputdev.nd, 0);
+
+    /* 申请中断 */
+    keyinputdev.irqkeydesc.handler = key0_handler;
+    keyinputdev.irqkeydesc.value = KEY_0;
+
+    ret = request_irq(keyinputdev.irqkeydesc.irqnum,
+                     keyinputdev.irqkeydesc.handler,
+                     IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+                     keyinputdev.irqkeydesc.name, &keyinputdev);
+    if (ret <0)
+    {
+        printk("irq %d request failed !\r\n", keyinputdev.irqkeydesc.irqnum);
+        return -EFAULT;
+    }
+
+    /* 创建定时器 */
+    init_timer(&keyinputdev.timer);
+    keyinputdev.timer.function = timer_function;
+    /* 申请input_dev */
+    keyinputdev.inputdev = input_allocate_device();
+    keyinputdev.inputdev->name = KEYINPUT_NAME;
+    keyinputdev.inputdev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
+    input_set_capability(keyinputdev.inputdev, EV_KEY, KEY_0);
+
+    /* 注册输入设备 */
+    ret = input_register_device(keyinputdev.inputdev);
+    if (ret)
+    {
+        printk("register input device failed!\r\n");
+        return ret;
+    }
+    return 0;
+}
+
+static __init keyinput_init(void)
+{
+    keyio_init();
+    return 0;
+}
+
+static __exit keyinput_exit(void)
+{
+
+}
+
+module_init(keyinput_init);
+module_exit(keyinput_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("zhangchaoliang");
diff --git a/20_input/keyinput.code-workspace b/20_input/keyinput.code-workspace
new file mode 100644
index 0000000000000000000000000000000000000000..213b97eda2a31e237f92d85a05c7209217d83dfc
--- /dev/null
+++ b/20_input/keyinput.code-workspace
@@ -0,0 +1,14 @@
+{
+	"folders": [
+		{
+			"path": "."
+		}
+	],
+	"settings": {
+		"files.associations": {
+			"ide.h": "c",
+			"init.h": "c"
+		}
+
+	}
+}
\ No newline at end of file
diff --git a/20_input/keyinputApp.c b/20_input/keyinputApp.c
new file mode 100644
index 0000000000000000000000000000000000000000..d49d43cd45998e93c00ca8cf7d7c90a7bf1c2d90
--- /dev/null
+++ b/20_input/keyinputApp.c
@@ -0,0 +1,60 @@
+#include "stdio.h"
+#include "unistd.h"
+#include "sys/types.h"
+#include "sys/stat.h"
+#include "fcntl.h"
+#include "stdlib.h"
+#include "string.h"
+#include <poll.h>
+#include <sys/select.h>
+#include <sys/time.h>
+#include <signal.h>
+#include <fcntl.h>
+#include <linux/input.h>
+
+static struct input_event inputevent;
+
+
+int main(int argc, char *argv[]){
+	int fd;
+	int err = 0;
+	char *filename;
+
+	filename = argv[1];
+
+	if (argc !=2 )
+	{
+		printf("Error Usage!\r\n");
+		return -1;
+	}
+
+	fd = open(filename, O_RDWR);
+	if (fd <0)
+	{
+		printf("Can't open file %s \r\n", filename);
+		return -1;
+	}
+
+	while(1){
+		err = read(fd, &inputevent, sizeof(inputevent));
+		if (err >0)
+		{
+			switch (inputevent.type)
+			{
+				case EV_KEY:
+					if (inputevent.code < BTN_MISC)
+					{
+						printf("key %d %s \r\n",inputevent.code,
+								inputevent.value ? "press" : "release");
+					}
+					break;
+				
+				default:
+					break;
+			}
+		}else {
+			printf("读取数据失败\r\n");
+		}
+	}
+	return 0;
+}