forked from drath/libratbag
93ca4e24d4
With permission from Benjamin Tissoires and Olivier Gay Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
127 lines
3.4 KiB
C
127 lines
3.4 KiB
C
/*
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* Logitech Unifying Receiver library.
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*
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* Copyright 2013 Benjamin Tissoires <benjamin.tissoires@gmail.com>
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* Copyright 2013 Red Hat, Inc
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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/*
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* Based on the HID++ 1.0 documentation provided by Nestor Lopez Casado at:
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* https://drive.google.com/folderview?id=0BxbRzx7vEV7eWmgwazJ3NUFfQ28&usp=sharing
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*/
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#include <linux/types.h>
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#include <linux/input.h>
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#include <linux/hidraw.h>
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#include <sys/ioctl.h>
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#include <unifying.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <unistd.h>
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#define DEV_DIR "/dev"
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#define HIDRAW_DEV_NAME "hidraw"
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int unifying_open_receiver(const char *hidraw) {
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struct hidraw_devinfo info;
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int fd, res;
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/* Open the Device with non-blocking reads. */
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fd = open(hidraw, O_RDWR);
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if (fd < 0) {
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perror("Unable to open device");
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goto out_err;
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}
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/* Get Raw Info */
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res = ioctl(fd, HIDIOCGRAWINFO, &info);
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if (res < 0) {
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perror("error while getting info from device");
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} else {
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/* Check if the device is an Unifying receiver */
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if (info.bustype != BUS_USB ||
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info.vendor != USB_VENDOR_ID_LOGITECH ||
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(info.product != USB_DEVICE_ID_UNIFYING_RECEIVER &&
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info.product != USB_DEVICE_ID_UNIFYING_RECEIVER_2))
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goto out_err;
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}
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return fd;
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out_err:
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if (fd >= 0)
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close(fd);
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return fd >= 0 ? -1 : fd;
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}
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/**
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* Filter for the AutoDevProbe scandir on /dev.
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*
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* @param dir The current directory entry provided by scandir.
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*
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* @return Non-zero if the given directory entry starts with "hidraw", or zero
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* otherwise.
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*/
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static int is_hidraw_device(const struct dirent *dir) {
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return strncmp(HIDRAW_DEV_NAME, dir->d_name, 6) == 0;
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}
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/**
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* Scans all /dev/hidraw*, open the first unifying receiver.
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*
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* @return The hidraw device file descriptor of the first unifying receiver.
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*/
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int unifying_find_receiver(void) {
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struct dirent **namelist;
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int fd = -1;
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char fname[64];
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int i, ndev;
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ndev = scandir(DEV_DIR, &namelist, is_hidraw_device, alphasort);
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if (ndev <= 0)
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return fd;
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for (i = 0; i < ndev; i++)
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{
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if (fd < 0) {
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snprintf(fname, sizeof(fname),
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"%s/%s", DEV_DIR, namelist[i]->d_name);
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fd = unifying_open_receiver(fname);
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}
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free(namelist[i]);
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}
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free(namelist);
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if (fd >= 0)
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printf("Using %s as the Unifying receiver.\n", fname);
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else
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printf("Unable to find an Unifying receiver.\n");
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return fd;
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}
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