From 47348ad8eec4f34c020168aea758354cf216a182 Mon Sep 17 00:00:00 2001
From: Gustavo Landtreter <gslandtreter@gmail.com>
Date: Thu, 27 Apr 2023 01:41:09 -0300
Subject: [PATCH] Added ioctl UI_DEV_SETUP call before UI_DEV_CREATE

The current implementation using fwrite() was causing new device
events not to be properly identified on Wayland (Sway), rendering
the udevice useless.

This change moves the code closer to the reference kernel impl
from https://kernel.org/doc/html/v6.2/input/uinput.html
---
 uinput.go     | 2 +-
 uinputdefs.go | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/uinput.go b/uinput.go
index d469bbe..f28caf9 100644
--- a/uinput.go
+++ b/uinput.go
@@ -139,7 +139,7 @@ func createUsbDevice(deviceFile *os.File, dev uinputUserDev) (fd *os.File, err e
 		_ = deviceFile.Close()
 		return nil, fmt.Errorf("failed to write user device buffer: %v", err)
 	}
-	_, err = deviceFile.Write(buf.Bytes())
+	err = ioctl(deviceFile, uiDevSetup, uintptr(unsafe.Pointer(buf)))
 	if err != nil {
 		_ = deviceFile.Close()
 		return nil, fmt.Errorf("failed to write uidev struct to device file: %v", err)
diff --git a/uinputdefs.go b/uinputdefs.go
index a0b367d..2c13632 100644
--- a/uinputdefs.go
+++ b/uinputdefs.go
@@ -7,6 +7,7 @@ const (
 	uinputMaxNameSize = 80
 	uiDevCreate       = 0x5501
 	uiDevDestroy      = 0x5502
+	uiDevSetup        = 0x405c5503
 	// this is for 64 length buffer to store name
 	// for another length generate using : (len << 16) | 0x8000552C
 	uiGetSysname = 0x8041552c