use real vendor/product id

the current way doesn't provide the real vendor/produc ids
that can be found via evtest.
This patch applies the same commands from the evtest source code.
It works for any pad, including bluetooth pads.

This patch was originally written for the batocera project at:
https://github.com/batocera-linux/batocera.linux/tree/master/board/batocera/patches/kodi-peripheral-joystick

Signed-off-by: Nicolas Adenis-Lamarre <[email protected]>

src/api/udev/JoystickUdev.cpp

@@ -11,10 +11,12 @@
 #include "log/Log.h"
 
 #include <algorithm>
+#include <cstdio>
 #include <errno.h>
 #include <fcntl.h>
 #include <libudev.h>
 #include <limits.h>
+#include <linux/input.h>
 #include <string.h>
 #include <sys/ioctl.h>
 #include <sys/stat.h>
@@ -278,15 +280,18 @@ bool CJoystickUdev::GetProperties()
   }
   SetName(name);
 
-  // Don't worry about unref'ing the parent
-  struct udev_device* parent = udev_device_get_parent_with_subsystem_devtype(m_dev, "usb", "usb_device");
-
-  const char* buf;
-  if ((buf = udev_device_get_sysattr_value(parent, "idVendor")) != nullptr)
-    SetVendorID(strtol(buf, NULL, 16));
+  unsigned short id[4] = {};
+  char val[16] = {};
+  if (ioctl(m_fd, EVIOCGID, id) == 0)
+  {
+    std::sprintf(val, "%x", id[ID_VENDOR]);
+    SetVendorID(strtol(val, NULL, 16));
+    dsyslog("[udev] Joystick information vendorid=%s for %s", val, m_path.c_str());
 
-  if ((buf = udev_device_get_sysattr_value(parent, "idProduct")) != nullptr)
-    SetProductID(strtol(buf, NULL, 16));
+    std::sprintf(val, "%x", id[ID_PRODUCT]);
+    SetProductID(strtol(val, NULL, 16));
+    dsyslog("[udev] Joystick information productid=%s for %s", val, m_path.c_str());
+  }
 
   struct stat st;
   if (fstat(m_fd, &st) < 0)