[PATCH] break joystick limitation of maximum 80 buttons
From: Wei Shuai <hidden>
Date: 2020-07-10 06:51:36
Also in:
lkml
Subsystem:
input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
Dmitry Torokhov, Linus Torvalds
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 <redacted> --- 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) /*
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2.17.1