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October 18, 2016 08:15
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Hidraw Userspace Example
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/* | |
* Hidraw Userspace Example | |
* | |
* Copyright (c) 2010 Alan Ott <alan@signal11.us> | |
* Copyright (c) 2010 Signal 11 Software | |
* | |
* The code may be used by anyone for any purpose, | |
* and can serve as a starting point for developing | |
* applications using hidraw. | |
*/ | |
/* Linux */ | |
#include <linux/types.h> | |
#include <linux/input.h> | |
#include <linux/hidraw.h> | |
/* | |
* Ugly hack to work around failing compilation on systems that don't | |
* yet populate new version of hidraw.h to userspace. | |
*/ | |
#ifndef HIDIOCSFEATURE | |
#warning Please have your distro update the userspace kernel headers | |
#define HIDIOCSFEATURE(len) _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x06, len) | |
#define HIDIOCGFEATURE(len) _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x07, len) | |
#endif | |
/* Unix */ | |
#include <sys/ioctl.h> | |
#include <sys/types.h> | |
#include <sys/stat.h> | |
#include <fcntl.h> | |
#include <unistd.h> | |
/* C */ | |
#include <stdio.h> | |
#include <string.h> | |
#include <stdlib.h> | |
#include <errno.h> | |
const char *bus_str(int bus); | |
int main(int argc, char **argv) | |
{ | |
int fd; | |
int i, res, desc_size = 0; | |
char buf[256]; | |
struct hidraw_report_descriptor rpt_desc; | |
struct hidraw_devinfo info; | |
char *device = "/dev/hidraw0"; | |
if (argc > 1) | |
device = argv[1]; | |
/* Open the Device with non-blocking reads. In real life, | |
don't use a hard coded path; use libudev instead. */ | |
fd = open(device, O_RDWR|O_NONBLOCK); | |
if (fd < 0) { | |
perror("Unable to open device"); | |
return 1; | |
} | |
memset(&rpt_desc, 0x0, sizeof(rpt_desc)); | |
memset(&info, 0x0, sizeof(info)); | |
memset(buf, 0x0, sizeof(buf)); | |
/* Get Report Descriptor Size */ | |
res = ioctl(fd, HIDIOCGRDESCSIZE, &desc_size); | |
if (res < 0) | |
perror("HIDIOCGRDESCSIZE"); | |
else | |
printf("Report Descriptor Size: %d\n", desc_size); | |
/* Get Report Descriptor */ | |
rpt_desc.size = desc_size; | |
res = ioctl(fd, HIDIOCGRDESC, &rpt_desc); | |
if (res < 0) { | |
perror("HIDIOCGRDESC"); | |
} else { | |
printf("Report Descriptor:\n"); | |
for (i = 0; i < rpt_desc.size; i++) | |
printf("%hhx ", rpt_desc.value[i]); | |
puts("\n"); | |
} | |
/* Get Raw Name */ | |
res = ioctl(fd, HIDIOCGRAWNAME(256), buf); | |
if (res < 0) | |
perror("HIDIOCGRAWNAME"); | |
else | |
printf("Raw Name: %s\n", buf); | |
/* Get Physical Location */ | |
res = ioctl(fd, HIDIOCGRAWPHYS(256), buf); | |
if (res < 0) | |
perror("HIDIOCGRAWPHYS"); | |
else | |
printf("Raw Phys: %s\n", buf); | |
/* Get Raw Info */ | |
res = ioctl(fd, HIDIOCGRAWINFO, &info); | |
if (res < 0) { | |
perror("HIDIOCGRAWINFO"); | |
} else { | |
printf("Raw Info:\n"); | |
printf("\tbustype: %d (%s)\n", | |
info.bustype, bus_str(info.bustype)); | |
printf("\tvendor: 0x%04hx\n", info.vendor); | |
printf("\tproduct: 0x%04hx\n", info.product); | |
} | |
/* Set Feature */ | |
buf[0] = 0x9; /* Report Number */ | |
buf[1] = 0xff; | |
buf[2] = 0xff; | |
buf[3] = 0xff; | |
res = ioctl(fd, HIDIOCSFEATURE(4), buf); | |
if (res < 0) | |
perror("HIDIOCSFEATURE"); | |
else | |
printf("ioctl HIDIOCGFEATURE returned: %d\n", res); | |
/* Get Feature */ | |
buf[0] = 0x9; /* Report Number */ | |
res = ioctl(fd, HIDIOCGFEATURE(256), buf); | |
if (res < 0) { | |
perror("HIDIOCGFEATURE"); | |
} else { | |
printf("ioctl HIDIOCGFEATURE returned: %d\n", res); | |
printf("Report data (not containing the report number):\n\t"); | |
for (i = 0; i < res; i++) | |
printf("%hhx ", buf[i]); | |
puts("\n"); | |
} | |
/* Send a Report to the Device */ | |
buf[0] = 0x1; /* Report Number */ | |
buf[1] = 0x77; | |
res = write(fd, buf, 2); | |
if (res < 0) { | |
printf("Error: %d\n", errno); | |
perror("write"); | |
} else { | |
printf("write() wrote %d bytes\n", res); | |
} | |
/* Get a report from the device */ | |
res = read(fd, buf, 16); | |
if (res < 0) { | |
perror("read"); | |
} else { | |
printf("read() read %d bytes:\n\t", res); | |
for (i = 0; i < res; i++) | |
printf("%hhx ", buf[i]); | |
puts("\n"); | |
} | |
close(fd); | |
return 0; | |
} | |
const char * | |
bus_str(int bus) | |
{ | |
switch (bus) { | |
case BUS_USB: | |
return "USB"; | |
break; | |
case BUS_HIL: | |
return "HIL"; | |
break; | |
case BUS_BLUETOOTH: | |
return "Bluetooth"; | |
break; | |
case BUS_VIRTUAL: | |
return "Virtual"; | |
break; | |
default: | |
return "Other"; | |
break; | |
} | |
} |
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