Added basic usb capabilities

Makefile

@@ -1,8 +1,8 @@
 NAME=ginput
 CC=gcc
 CAMBALACHE=cambalache
-CFLAGS=$(shell pkg-config --cflags gtk4 libadwaita-1) -O3 -I src
+CFLAGS=$(shell pkg-config --cflags gtk4 libadwaita-1 libusb-1.0) -O3 -I src
-LDFLAGS=$(shell pkg-config --libs gtk4 libadwaita-1)
+LDFLAGS=$(shell pkg-config --libs gtk4 libadwaita-1 libusb-1.0)
 BUILD_DIR=build
 
 CMB := $(wildcard ui/*.cmb)

src/device/usb/usb.c

@@ -0,0 +1,28 @@
+#include <libusb.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+void usb_init()
+{
+    // List all usb devices obtaining 'vendor:product'
+    // Call corresponding driver if it exists, so 
+    // that we get a peripheral handle
+    if(libusb_init(NULL))
+    {
+        fprintf(stderr, "Error: Could not initialize libusb\n");
+        return;
+    }
+
+    libusb_device** list;
+    ssize_t device_count = libusb_get_device_list(NULL, &list);
+    if(device_count <= 0) return;
+
+    for(ssize_t i = 0; i < device_count; i++)
+    {
+        libusb_device* current = list[i];
+        struct libusb_device_descriptor desc;
+        libusb_get_device_descriptor(current, &desc);
+
+        printf("Found usb device %04x:%04x\n", desc.idVendor, desc.idProduct);
+    }
+}

src/device/usb/usb.h

@@ -0,0 +1,6 @@
+#ifndef USB_H
+#define USB_H
+
+void usb_init();
+
+#endif

src/main.c

@@ -1,7 +1,10 @@
 #include "ui/ginput-application.h"
+#include "device/usb/usb.h"
 
 int main(gint argc, gchar** argv)
 {
+	usb_init();
+
 	AdwApplication* application = ginput_application_new();
 	return g_application_run(G_APPLICATION(application), argc, argv);
 }