Android系统利用uinput设备驱动实现虚拟输入设备

一、内核配置

Device Drivers——>Input Device Support——>Miscellaneous devices——>User level driver support

drivers/input/misc/uinput.ko

CONFIG_INPUT_MISC=y

CONFIG_INPUT_UINPUT=y

二、以下是ubuntu下的测试用例：

1.testuinput.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <linux/uinput.h>

int main(){
  struct uinput_user_dev device;
  memset(&device, 0, sizeof device);
  int uinputfd = open("/dev/uinput",O_WRONLY);
  strcpy(device.name, "Hillcrest Labs Virtual Pointer");
  device.id.bustype = BUS_USB;
  device.id.vendor = 0x1d5a; // Hillcrest Labs VID
  device.id.product = 0xc2b3; // FSM, but probably doesn't matter
  device.id.version = 1;
  int i = 0;
  for (i = 0; i < ABS_MAX; i++) {
    device.absmax[i] = -1;
    device.absmin[i] = -1;
    device.absfuzz[i] = -1;
    device.absflat[i] = -1;
  }
  if (write(uinputfd,&device,sizeof(device)) != sizeof(device)) {
    fprintf(stderr, "Error initializing the input device.\n");
    return 1;
  }
  if (ioctl(uinputfd, UI_SET_EVBIT, EV_REL) < 0 ||
    ioctl(uinputfd, UI_SET_RELBIT, REL_X) < 0 ||
    ioctl(uinputfd, UI_SET_RELBIT, REL_Y) < 0 ||
    ioctl(uinputfd, UI_SET_RELBIT, REL_WHEEL) < 0 ||
    ioctl(uinputfd, UI_SET_EVBIT, EV_KEY) < 0 ||
    ioctl(uinputfd, UI_SET_KEYBIT, BTN_LEFT) < 0 ||
    ioctl(uinputfd, UI_SET_KEYBIT, BTN_RIGHT) < 0 ||
    ioctl(uinputfd, UI_SET_KEYBIT, BTN_MIDDLE) < 0 ||
    ioctl(uinputfd,UI_DEV_CREATE) < 0) {
    fprintf(stderr, "Error configuring the input device.\n");
    return 1;
  }  
  while(1){


  };
  return 0;
}

2.gcc testuinput.c -o testuinput

3.执行

./testuinput

结果：

getevent

add device 1: /dev/input/event10
  name:     "Hillcrest Labs Virtual Pointer"