linux-kernel - [RFC PATCH 1/6] Input: Introduce EV

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Message-ID: <20260104213132.163904-2-tomasz.pakula.oficjalny@gmail.com>
Date: Sun,  4 Jan 2026 22:31:27 +0100
From: Tomasz Pakuła <tomasz.pakula.oficjalny@...il.com>
To: dmitry.torokhov@...il.com,
	corbet@....net,
	jikos@...nel.org,
	bentiss@...nel.org
Cc: linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org,
	vi@...rift.com,
	linux-kernel@...imeter.info,
	peter.hutterer@...-t.net
Subject: [RFC PATCH 1/6] Input: Introduce EV_BTN event for generic buttons

This will be used to fire generic button events that only transmit
button number and it's value, not related to any defined usage.

Made for HID joysticks but could be adopted by other devices.

Signed-off-by: Tomasz Pakuła <tomasz.pakula.oficjalny@...il.com>
---
 Documentation/input/event-codes.rst    | 5 +++++
 include/uapi/linux/input-event-codes.h | 1 +
 2 files changed, 6 insertions(+)

diff --git a/Documentation/input/event-codes.rst b/Documentation/input/event-codes.rst
index 4424cbff251f..c387eaa63dfb 100644
--- a/Documentation/input/event-codes.rst
+++ b/Documentation/input/event-codes.rst
@@ -59,6 +59,11 @@ Codes section for details on valid codes for each type.
 
   - Used to describe binary state input switches.
 
+* EV_BTN:
+
+  - Used to describe state changes generic, numbered buttons without defined
+    usages.
+
 * EV_LED:
 
   - Used to turn LEDs on devices on and off.
diff --git a/include/uapi/linux/input-event-codes.h b/include/uapi/linux/input-event-codes.h
index 30f3c9eaafaa..1c853c37b58a 100644
--- a/include/uapi/linux/input-event-codes.h
+++ b/include/uapi/linux/input-event-codes.h
@@ -42,6 +42,7 @@
 #define EV_ABS			0x03
 #define EV_MSC			0x04
 #define EV_SW			0x05
+#define EV_BTN			0x06
 #define EV_LED			0x11
 #define EV_SND			0x12
 #define EV_REP			0x14
-- 
2.52.0