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    SubjectRe: [PATCH v5 1/1] HID: Add full support for Logitech Unifying receivers
    From
    Hi Richard,

    here, you'll find a small C program that allows you to do a pairing of
    a new device to a receiver.

    compile it with with gcc -o pairing_tool pairing_tool.c

    --------------------------------- file pairing_tool.c
    ---------------------------------
    /*
    * Copyright 2011 Benjamin Tissoires <benjamin.tissoires@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/>.
    */

    #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;
    }
    ----------------------------- end of file pairing_tool.c
    ----------------------------

    I hope it will be useful to you.

    Cheers,
    Benjamin

    On Mon, Sep 19, 2011 at 22:12, Richard Schütz <r.schtz@t-online.de> wrote:
    > Am 14.09.2011 18:48, schrieb Nestor Lopez Casado:
    >>
    >> From: Nestor Lopez Casado<nlopezcasad@logitech.com>
    >>
    >> With this driver, all the devices paired to a single Unifying
    >> receiver are exposed to user processes in separated /input/dev
    >> nodes.
    >
    > But there's still no way to pair devices with an Unifying receiver under
    > Linux, right? It would be nice to have a simple userspace tool for that,
    > too.
    >
    > --
    > Regards,
    > Richard Schütz
    >
    --
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