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unifying_pair.c
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+/*
+ * 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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