linux-kernel - Re: [PATCH v5 1/1] HID: Add full support for Logitech Unifying receivers

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Message-ID: <CAN+gG=Hs-JrnPvfAB2XtrSQiKYw4NFMOKBaj+8n9Xtoq1rmtUA@mail.gmail.com>
Date:	Mon, 23 Apr 2012 13:07:32 +0200
From:	Benjamin Tissoires <benjamin.tissoires@...il.com>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Richard Schütz <r.schtz@...nline.de>,
	Nestor Lopez Casado <nlopezcasad@...itech.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	rtitmuss@...itech.com, ogay@...itech.com, jzanone@...itech.com
Subject: Re: [PATCH v5 1/1] HID: Add full support for Logitech Unifying receivers

On 17/04/2012, Jiri Kosina <jkosina@...e.cz> wrote:
> On Thu, 22 Sep 2011, Benjamin Tissoires wrote:
>
>> 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
>
> Could this perhaps be provided into Documentation/ or samples/ somewhere?
> I don't think that Logitech themselves do ship pairing application for
> Linux, or do they?
>

Hi Jiri,

well, I don't have any information about an official pairing tool.
However, I don't think the kernel is the good place for this stuff.
Other people started projects based on this code:
https://bitbucket.org/clach04/logitech-unifying-receiver-tools/ for instance.

Thanks,
Benjamin

> If they don't, it'd be nice to have this at least documented somewhere, so
> that someone could write a pairing GUI.
>
> Thanks.
>
>>
>> --------------------------------- file pairing_tool.c
>> ---------------------------------
>> /*
>>  * Copyright 2011 Benjamin Tissoires <benjamin.tissoires@...il.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;
>> }
>
> --
> Jiri Kosina
> SUSE Labs
>
>
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