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Commit 61e00655 authored by David Herrmann's avatar David Herrmann Committed by Jiri Kosina
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Input: introduce BTN/ABS bits for drums and guitars 

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: default avatarDavid Herrmann <dh.herrmann@gmail.com>
Acked-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent a6be8569

include/linux/mod_devicetable.h

+1 −1
Original line number Diff line number Diff line
@@ -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		0x3f

#define INPUT_DEVICE_ID_ABS_MAX		0x4f

#define INPUT_DEVICE_ID_MSC_MAX		0x07

#define INPUT_DEVICE_ID_LED_MAX		0x0f

#define INPUT_DEVICE_ID_SND_MAX		0x07

include/uapi/linux/input.h

+23 −2
Original line number Diff line number Diff line
@@ -716,6 +716,14 @@ 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
@@ -829,8 +837,21 @@ struct input_keymap_entry { 
#define ABS_MT_TOOL_X		0x3c	/* Center X tool position */

#define ABS_MT_TOOL_Y		0x3d	/* Center Y tool position */





#define ABS_MAX			0x3f

/* Drums and guitars (mostly toys) */

#define ABS_TOM_FAR_LEFT	0x40

#define ABS_TOM_LEFT		0x41

#define ABS_TOM_RIGHT		0x42

#define ABS_TOM_FAR_RIGHT	0x43

#define ABS_CYMBAL_FAR_LEFT	0x44

#define ABS_CYMBAL_LEFT		0x45

#define ABS_CYMBAL_RIGHT	0x46

#define ABS_CYMBAL_FAR_RIGHT	0x47

#define ABS_BASS		0x48

#define ABS_HI_HAT		0x49

#define ABS_FRET_BOARD		0x4a	/* Guitar fret board, vertical pos */

#define ABS_WHAMMY_BAR		0x4b	/* Guitar whammy bar (or vibrato) */



#define ABS_MAX			0x4f

#define ABS_CNT			(ABS_MAX+1)



/*