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Pair logitec devices in Linux
/*
* Copyright 2011 Benjamin Tissoires <benjamin.tissoi...@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
// gcc -o unifying_pair unifying_pair.c
#include <linux/input.h>
#include <linux/hidraw.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#define USB_VENDOR_ID_LOGITECH (__u32)0x046d
#define USB_DEVICE_ID_UNIFYING_RECEIVER (__s16)0xc52b
#define USB_DEVICE_ID_UNIFYING_RECEIVER_2 (__s16)0xc532
int main(int argc, char **argv)
{
int fd;
int res;
struct hidraw_devinfo info;
char magic_sequence[] = {0x10, 0xFF, 0x80, 0xB2, 0x01, 0x00, 0x00};
if (argc == 1) {
errno = EINVAL;
perror("No hidraw device given");
return 1;
}
/* Open the Device with non-blocking reads. */
fd = open(argv[1], O_RDWR|O_NONBLOCK);
if (fd < 0) {
perror("Unable to open device");
return 1;
}
/* Get Raw Info */
res = ioctl(fd, HIDIOCGRAWINFO, &info);
if (res < 0) {
perror("error while getting info from device");
} else {
if (info.bustype != BUS_USB ||
info.vendor != USB_VENDOR_ID_LOGITECH ||
(info.product != USB_DEVICE_ID_UNIFYING_RECEIVER &&
info.product != USB_DEVICE_ID_UNIFYING_RECEIVER_2)) {
errno = EPERM;
perror("The given device is not a Logitech "
"Unifying Receiver");
return 1;
}
}
/* Send the magic sequence to the Device */
res = write(fd, magic_sequence, sizeof(magic_sequence));
if (res < 0) {
printf("Error: %d\n", errno);
perror("write");
} else if (res == sizeof(magic_sequence)) {
printf("The receiver is ready to pair a new device.\n"
"Switch your device on to pair it.\n");
} else {
errno = ENOMEM;
printf("write: %d were written instead of %ld.\n", res,
sizeof(magic_sequence));
perror("write");
}
close(fd);
return 0;
}
@andmoos
andmoos commented Apr 7, 2015

If one knows his input device path one may also use this Shell-only version:
https://gist.github.com/superm00s/15879e7f4f376fa4e6c3

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