linux-kernel - [PATCH] Input: change joystick 80 buttons limitation

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Message-ID: <fc66f27b-9a73-4a71-8dbe-f48609719d90@oracle.com>
Date: Mon, 9 Feb 2026 14:36:12 +0100
From: Ricardo Esteves <ricardo.lopes.esteves@...cle.com>
To: linux-kernel@...r.kernel.org
Cc: linux-input@...r.kernel.org, dmitry.torokhov@...il.com,
        ricardo.lopes.esteves@...cle.com
Subject: [PATCH] Input: change joystick 80 buttons limitation

Currently linux joystick support is limited to 80 buttons.

The default value for the max scan code that a key/button can have in 
the linux kernel is 0x2ff (767), which is equivalent to 80 keys/buttons.

The value i propose in the bellow patch is 0x31d (797) which is +30 
buttons, so a max of 110 keys/buttons.

Works perfectly with WINWING Orion Throttle Base II + F15EX HANDLE, all 
110 buttons are recognized (is the joystick i found to have the biggest 
amount of buttons so far).


--- a/include/linux/mod_devicetable.h	2025-11-14 16:31:54.542228221 +0100
+++ a/include/linux/mod_devicetable.h	2025-11-02 01:00:00.000000000 +0100
@@ -333,7 +333,7 @@
  /* Input */
  #define INPUT_DEVICE_ID_EV_MAX		0x1f
  #define INPUT_DEVICE_ID_KEY_MIN_INTERESTING	0x71
-#define INPUT_DEVICE_ID_KEY_MAX		0x2ff
+#define INPUT_DEVICE_ID_KEY_MAX		0x31d
  #define INPUT_DEVICE_ID_REL_MAX		0x0f
  #define INPUT_DEVICE_ID_ABS_MAX		0x3f
  #define INPUT_DEVICE_ID_MSC_MAX		0x07
--- a/include/uapi/linux/input-event-codes.h	2025-11-02 
01:00:00.000000000 +0100
+++ a/include/uapi/linux/input-event-codes.h	2025-11-14 
16:34:37.218263985 +0100
@@ -817,7 +817,7 @@

  /* We avoid low common keys in module aliases so they don't get huge. */
  #define KEY_MIN_INTERESTING	KEY_MUTE
-#define KEY_MAX			0x2ff
+#define KEY_MAX			0x31d
  #define KEY_CNT			(KEY_MAX+1)

  /*



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