[PATCH 11/13] Input: introduce BTN/ABS bits for drums and guitars
From: David Herrmann <hidden>
Date: 2013-11-01 20:17:02
Subsystem:
input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
Dmitry Torokhov, Linus Torvalds
There are a bunch of guitar and drums devices out there that all report
similar data. To avoid reporting this as BTN_MISC or ABS_MISC, we
allocate some proper namespace for them. Note that most of these devices
are toys and we cannot report any sophisticated physics via this API.
I did some google-images research and tried to provide definitions that
work with all common devices. That's why I went with 4 toms, 4 cymbals,
one bass, one hi-hat. I haven't seen other drums and I doubt that we need
any additions to that. Anyway, the naming-scheme is intentionally done in
an extensible way.
For guitars, we support 5 frets (normally aligned vertically, compared to
the real horizontal layouts), a single strum-bar with up/down directions,
an optional fret-board and a whammy-bar.
Most of the devices provide pressure values so I went with ABS_* bits. If
we ever support devices which only provide digital input, we have to
decide whether to emulate pressure data or add additional BTN_* bits.
If someone is not familiar with these devices, here are two pictures which
provide almost all introduced interfaces (or try the given keywords
with a google-image search):
Guitar: ("guitar hero world tour guitar")
http://images1.wikia.nocookie.net/__cb20120911023442/applezone/es/images/f/f9/Wii_Guitar.jpg
Drums: ("guitar hero drums")
http://oyster.ignimgs.com/franchises/images/03/55/35526_band-hero-drum-set-hands-on-20090929040735768.jpg
Signed-off-by: David Herrmann <redacted>
---
include/linux/mod_devicetable.h | 2 +-
include/uapi/linux/input.h | 24 +++++++++++++++++++++++-
2 files changed, 24 insertions(+), 2 deletions(-)
diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index 329aa30..61f358a 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h@@ -277,7 +277,7 @@ struct pcmcia_device_id { #define INPUT_DEVICE_ID_KEY_MIN_INTERESTING 0x71 #define INPUT_DEVICE_ID_KEY_MAX 0x2ff #define INPUT_DEVICE_ID_REL_MAX 0x0f -#define INPUT_DEVICE_ID_ABS_MAX 0x4f +#define INPUT_DEVICE_ID_ABS_MAX 0x5f #define INPUT_DEVICE_ID_MSC_MAX 0x07 #define INPUT_DEVICE_ID_LED_MAX 0x0f #define INPUT_DEVICE_ID_SND_MAX 0x07
diff --git a/include/uapi/linux/input.h b/include/uapi/linux/input.h
index f347498..3aac45a 100644
--- a/include/uapi/linux/input.h
+++ b/include/uapi/linux/input.h@@ -742,6 +742,14 @@ struct input_keymap_entry { #define BTN_DPAD_LEFT 0x222 #define BTN_DPAD_RIGHT 0x223 +#define BTN_FRET_FAR_UP 0x224 +#define BTN_FRET_UP 0x225 +#define BTN_FRET_MID 0x226 +#define BTN_FRET_LOW 0x227 +#define BTN_FRET_FAR_LOW 0x228 +#define BTN_STRUM_BAR_UP 0x229 +#define BTN_STRUM_BAR_DOWN 0x22a + #define BTN_TRIGGER_HAPPY 0x2c0 #define BTN_TRIGGER_HAPPY1 0x2c0 #define BTN_TRIGGER_HAPPY2 0x2c1
@@ -870,12 +878,26 @@ struct input_keymap_entry { #define ABS_GYRO_Y 0x44 /* Gyroscope Y axis */ #define ABS_GYRO_Z 0x45 /* Gyroscope Z axis */ +/* Drums and guitars (mostly toys) */ +#define ABS_TOM_FAR_LEFT 0x50 +#define ABS_TOM_LEFT 0x51 +#define ABS_TOM_RIGHT 0x52 +#define ABS_TOM_FAR_RIGHT 0x53 +#define ABS_CYMBAL_FAR_LEFT 0x54 +#define ABS_CYMBAL_LEFT 0x55 +#define ABS_CYMBAL_RIGHT 0x56 +#define ABS_CYMBAL_FAR_RIGHT 0x57 +#define ABS_BASS 0x58 +#define ABS_HI_HAT 0x59 +#define ABS_FRET_BOARD 0x5a /* Guitar fret board, vertical pos */ +#define ABS_WHAMMY_BAR 0x5b /* Guitar whammy bar (or vibrato) */ + /* * Due to API restrictions the legacy evdev API only supports ABS values up to * ABS_MAX/CNT. Use the extended *ABS2 ioctls to operate on any ABS values in * between ABS_MAX and ABS_MAX2. */ -#define ABS_MAX2 0x4f +#define ABS_MAX2 0x5f #define ABS_CNT2 (ABS_MAX2+1) /*
--
1.8.4.1