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  1. mig created this gist .
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    85 unifying_pair.c
    @@ -0,0 +1,85 @@
    +/*
    + * 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;
    +}
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