linux-kernel - [PATCH] break joystick limitation of maximum 80 buttons

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Date:   Fri, 10 Jul 2020 14:51:10 +0800
From:   Wei Shuai <cpuwolf@...il.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     cpuwolf@...il.com, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jeffrey Hugo <jhugo@...eaurora.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Borislav Petkov <bp@...e.de>, Mattias Jacobsson <2pi@....nu>,
        Mark Gross <mgross@...ux.intel.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Erwan Velu <e.velu@...teo.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org (open list),
        linux-input@...r.kernel.org (open list:INPUT (KEYBOARD, MOUSE, JOYSTICK
        , TOUCHSCREEN)...)
Subject: [PATCH] break joystick limitation of maximum 80 buttons

The 80 limitation comes from

include/uapi/linux/input-event-codes.h

according to function hidinput_configure_usage() in file drivers/hid/hid-input.c

the joystick button mapping is not a continues space
generally speaking, the mapping space is from

1. BTN_JOYSTICK~BTN_DEAD
2. BTN_TRIGGER_HAPPY~KEY_MAX

and

Finally I got the max limitation is 80.

Signed-off-by: Wei Shuai <cpuwolf@...il.com>
---
 include/linux/mod_devicetable.h        | 2 +-
 include/uapi/linux/input-event-codes.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index 8d764aab29de..35eb59ae1f19 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -311,7 +311,7 @@ struct pcmcia_device_id {
 /* 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		0x4ff
 #define INPUT_DEVICE_ID_REL_MAX		0x0f
 #define INPUT_DEVICE_ID_ABS_MAX		0x3f
 #define INPUT_DEVICE_ID_MSC_MAX		0x07
diff --git a/include/uapi/linux/input-event-codes.h b/include/uapi/linux/input-event-codes.h
index b6a835d37826..ad1b9bed3828 100644
--- a/include/uapi/linux/input-event-codes.h
+++ b/include/uapi/linux/input-event-codes.h
@@ -774,7 +774,7 @@
 
 /* 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			0x4ff
 #define KEY_CNT			(KEY_MAX+1)
 
 /*
-- 
2.17.1