获取输入设备的vid和pid

一、获取/dev/input/event16设备的vid和pid

testhid.c

#include <linux/types.h>
#include <linux/input.h>
#include <linux/hidraw.h>

#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <poll.h>
#include <time.h>
#include <math.h>

#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
int main(){
  char filename[64];
  strcpy(filename,"/dev/input/event16");
  char name[80];
  int fd = open(filename, O_RDWR /*| O_NONBLOCK*/);
  if(fd <= 0) {
    printf("TK----------->>>>open error
");
    return -1;
  }
  /////////
  struct input_id inputId;
  int rc = ioctl(fd, EVIOCGID, &inputId);
  printf("TK-------->>>>info.vendor is 0x%x
",inputId.vendor);
  printf("TK-------->>>>info.product is 0x%x
",inputId.product);
  printf("TK-------->>>>info.bustype is 0x%x
",inputId.bustype);
  /*
  struct hidraw_devinfo info;
  int rc = ioctl(fd, HIDIOCGRAWINFO, &info);
  printf("TK-------->>>>info.vendor is 0x%x
",info.vendor);
  printf("TK-------->>>>info.product is 0x%x
",info.product);
  printf("TK-------->>>>info.bustype is 0x%x
",info.bustype);
  */
  ///////////
  struct hidraw_report_descriptor descriptor;
  rc = ioctl(fd, HIDIOCGRDESC, &descriptor);
  printf("TK-------->>>>descriptor.size is 0x%04x
",descriptor.size);
  //////
  int descriptorSize=0;
  rc = ioctl(fd, HIDIOCGRDESCSIZE, &descriptorSize);
  printf("TK-------->>>>descriptorSize is 0x%04x
",descriptorSize);
  //////
  name[sizeof(name) - 1] = '';
  if(ioctl(fd, EVIOCGNAME(sizeof(name) - 1), &name) < 1) {
    name[0] = '';
  }
  printf("TK------->>>name is %s
",name);
  //////
  close(fd);
  return 0;
}

二、编译

Android.mk

LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)

LOCAL_SRC_FILES:=
    testhid.c

LOCAL_SHARED_LIBRARIES :=
    libutils

LOCAL_MODULE:= testinput

LOCAL_MODULE_TAGS := optional

include $(BUILD_EXECUTABLE)

三、运行

TK-------->>>>info.vendor is 0x0
TK-------->>>>info.product is 0x1
TK-------->>>>info.bustype is 0x19
TK-------->>>>descriptor.size is 0x0000
TK-------->>>>descriptorSize is 0x0000
TK------->>>name is Power Button