* [PATCH] break joystick limitation of maxmium 80 buttons
@ 2020-07-10 6:19 Wei Shuai
0 siblings, 0 replies; only message in thread
From: Wei Shuai @ 2020-07-10 6:19 UTC (permalink / raw)
Cc: cpuwolf, Dmitry Torokhov, Greg Kroah-Hartman, Andy Shevchenko,
Thomas Gleixner, Manivannan Sadhasivam, Jeffrey Hugo,
Russell King, Erwan Velu, Mark Gross, open list,
open list:INPUT (KEYBOARD, MOUSE, JOYSTICK , TOUCHSCREEN)...
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 speak the mapping space is from
1. BTN_JOYSTICK~BTN_DEAD
2. BTN_TRIGGER_HAPPY~KEY_MAX
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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