From 6b0c939d72c11e404f84c926cf82f9501f8511ff Mon Sep 17 00:00:00 2001
From: tmk <nobody@nowhere>
Date: Wed, 5 Jan 2011 00:04:25 +0900
Subject: add a build option: USB_EXTRA_ENABLE

---
 usb_extra.h | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'usb_extra.h')

diff --git a/usb_extra.h b/usb_extra.h
index 202f3223b3..d6f9e8ba0a 100644
--- a/usb_extra.h
+++ b/usb_extra.h
@@ -1,5 +1,11 @@
 #ifndef USB_EXTRA_H
 #define  USB_EXTRA_H 1
+/*
+ * Enhanced keyboard features for Windows:
+ * Audio control and System control
+ *
+ * http://www.microsoft.com/whdc/archive/w2kbd.mspx
+ */
 
 #include <stdint.h>
 #include "usb.h"
@@ -10,11 +16,13 @@
 #define EXTRA_SIZE		2
 #define EXTRA_BUFFER		EP_DOUBLE_BUFFER
 
-// http://www.microsoft.com/whdc/archive/w2kbd.mspx
+
+// Consumer Page(0x0C) Consumer Control(0x01)
 #define AUDIO_VOL_UP		(1<<0)
 #define AUDIO_VOL_DOWN		(1<<1)
 #define AUDIO_MUTE		(1<<2)
 
+// Generic Desktop Page(0x01) System Control(0x80)
 #define SYSTEM_POWER_DOWN	(1<<0)
 #define SYSTEM_SLEEP		(1<<1)
 #define SYSTEM_WAKE_UP		(1<<2)
-- 
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