How can I make the function keys the default on a Logitech K760 Bluetooh keyboard?

Solution 1:

Hi I have the k760 keyboard an im also trying to find a way to do this. This seems to be a good place to start http://www.spinics.net/lists/linux-input/msg24280.html

He has managed to get it working for k810. if you can get the setpoint codes for the k760 you should be able to modify this code to make it work for k760 that is asuming that they are similar.

Update: I got it working !!! used the same procedure as describedd in the link.

#define HID_VENDOR_ID_LOGITECH          (__u32)0x046d
#define HID_DEVICE_ID_K810              (__s16)0xb316

const char k810_seq_fkeys_on[]  = {0x10, 0xff, 0x05, 0x14, 0x00, 0x00, 0x00};
const char k810_seq_fkeys_off[] = {0x10, 0xff, 0x05, 0x14, 0x01, 0x00, 0x00};

Solution 2:

It looks like the changes to the C code from the other answer do work (but off turns on the function keys, I had thought on would do that). I wanted to extend the code to auto-detect the keyboard for me and couldn't bear the thought of writing file searching code in C, so I ported the code to Perl 5:

#!/usr/bin/perl

use strict;
use warnings;

use constant HIDIOCGRAWINFO         => 2148026371;
use constant BUS_BLUETOOTH          =>          5;
use constant HID_VENDOR_ID_LOGITECH =>       1133;
use constant HID_DEVICE_ID_K760     =>     -19690;
use constant HID_DEVICE_ID_K760_ALT =>     -19688;
use constant HID_DEVICE_ID_K810     =>     -19687;

my %message = (
    HID_DEVICE_ID_K760() => {
        on   => (pack "C*", 0x10, 0xff, 0x05, 0x14, 0x00, 0x00, 0x00),
        off  => (pack "C*", 0x10, 0xff, 0x05, 0x14, 0x01, 0x00, 0x00),
    },
    HID_DEVICE_ID_K760_ALT() => {
        on   => (pack "C*", 0x10, 0xff, 0x05, 0x14, 0x00, 0x00, 0x00),
        off  => (pack "C*", 0x10, 0xff, 0x05, 0x14, 0x01, 0x00, 0x00),
    },
    HID_DEVICE_ID_K810() => {
        on   => (pack "C*", 0x10, 0xff, 0x06, 0x15, 0x00, 0x00, 0x00),
        off  => (pack "C*", 0x10, 0xff, 0x06, 0x15, 0x01, 0x00, 0x00),
    },
);

#die
#   "usage: $0 [on|off]\n",
#   "\ton  makes the media keys the default\n",
#   "\toff makes the function keys the default\n"
#unless @ARGV == 1 and my ($choice) = $ARGV[0] =~ /^(on|off)$/;
my ($choice) = @ARGV ? $ARGV[0] =~ /^(on|off)$/ : "off";

my $device;

# find the first device we can set the option on
# TODO: add a parameter to directly specify a device
# TODO: add a parameter to make it set all devices
FILE_SEARCH:
for my $file (</sys/class/hidraw/hidraw*/device/uevent>) {
    open my $fh, "<", $file or do {
        warn "could not open $file: $!\n";
        next;
    };

    while (<$fh>) {
        if (/HID_NAME=Logitech K(76|81)0/) {
            my ($hid_raw_name) = $file =~ m{(hidraw[^/]+)};
            $device = "/dev/$hid_raw_name";
            last FILE_SEARCH;
        }
    }
}

die "sorry, could not find a suported device on your machine\n" unless $device;

# re-exec with sudo if we can't open the device
unless (-r $device and -w $device) {
    # unless we are already root
    exec "sudo", $^X, $0, @ARGV unless $> == 0;
}

open my $dev, "+<", $device or die "could not open device $device: $!\n";

my $success = ioctl $dev, HIDIOCGRAWINFO, my $struct = "";

die "could not determine if $device is supported\n" unless $success;

my ($bus_type, $vendor, $product) = unpack "Lss", $struct;

die "detected device $device is not a Bluetooth device\n"
    unless $bus_type == BUS_BLUETOOTH;

die "detected device $device is not a Logitech product\n"
    unless $vendor == HID_VENDOR_ID_LOGITECH;

die "detected device $device is not a supported product\n"
    unless exists $message{$product};

syswrite $dev, $message{$product}{$choice};

close $dev;

Update: quick and dirty solution to the there being more than one device id for K760.