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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183// SPDX-License-Identifier: GPL-2.0/* * 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 HIDIOCSFEATURE 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:\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; }}