Messages in this thread Patch in this message | | | From | Wei Shuai <> | Subject | [PATCH] break joystick limitation of maximum 80 buttons | Date | Fri, 10 Jul 2020 14:51:10 +0800 |
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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@gmail.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
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