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100 lines
3.6 KiB
C
100 lines
3.6 KiB
C
/*
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* hidmanage.c - manage HID devices
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*
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* Copyright 2016 Edward V. Emelianoff <eddy@sao.ru, edward.emelianoff@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#include <libudev.h>
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#include "usefull_macros.h"
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#include "hidmanage.h"
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/**
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* Find turrets present
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* @param wheels (o) - if not NULL - list of wheels found (like "ABC")
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* return amount of devices found
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*
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* WARNING! If there's more than one turret with wheels having same name
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* access by wheel ID could lead undefined behaviour!
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*/
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int find_wheels(wheel_descr **wheels){
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struct udev *udev;
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struct udev_enumerate *enumerate;
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struct udev_list_entry *devices, *dev_list_entry;
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wheel_descr *Found = NULL;
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// Create the udev object
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udev = udev_new();
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int N = 0;
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if(!udev){
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ERR("Can't create udev");
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}
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// Create a list of the devices in the 'hidraw' subsystem.
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enumerate = udev_enumerate_new(udev);
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udev_enumerate_add_match_subsystem(enumerate, "hidraw");
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udev_enumerate_scan_devices(enumerate);
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devices = udev_enumerate_get_list_entry(enumerate);
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// Check out each device found
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udev_list_entry_foreach(dev_list_entry, devices){
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const char *path;
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struct udev_device *dev;
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path = udev_list_entry_get_name(dev_list_entry);
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dev = udev_device_new_from_syspath(udev, path);
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const char *devpath = udev_device_get_devnode(dev);
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DBG("Device Node Path: %s", devpath);
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dev = udev_device_get_parent_with_subsystem_devtype(dev, "usb", "usb_device");
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if(!dev){
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WARNX("Unable to find parent usb device for %s", devpath);
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udev_device_unref(dev);
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continue;
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}
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const char *vid, *pid;
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vid = udev_device_get_sysattr_value(dev,"idVendor");
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pid = udev_device_get_sysattr_value(dev, "idProduct");
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DBG(" VID/PID: %s/%s", vid, pid);
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if(strcmp(vid, W_VID) == 0 && strcmp(pid, W_PID) == 0){
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++N;
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if(!Found){
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Found = MALLOC(wheel_descr, 1);
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}else{
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Found = realloc(Found, sizeof(wheel_descr)*N);
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if(!Found) ERR("realloc");
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}
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wheel_descr *curdev = &Found[N-1];
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int fd = open(devpath, O_RDWR|O_NONBLOCK);
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if(fd < 0){
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/// "<22><> <20><><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> %s"
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WARN(_("Can't open %s"), devpath);
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curdev->fd = -1;
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}else
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curdev->fd = fd;
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DBG("%s %s",
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udev_device_get_sysattr_value(dev,"manufacturer"),
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udev_device_get_sysattr_value(dev,"product"));
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curdev->serial = strdup(udev_device_get_sysattr_value(dev, "serial"));
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DBG("serial: %s\n", curdev->serial);
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}
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udev_device_unref(dev);
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}
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// Free the enumerator object
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udev_enumerate_unref(enumerate);
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if(wheels){
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*wheels = Found;
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}else
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free(Found);
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return N;
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}
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