nagai/kernel
3
0
Fork 0
forked from mirrors/linux
Code Pull requests Activity

Input: introduce BTN/ABS bits for drums and guitars

Browse source 
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 <dh.herrmann@gmail.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
David Herrmann 2013-08-26 19:14:46 +02:00 committed by Jiri Kosina
parent a6be8569b6
commit 61e00655e9
2 changed files with 23 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
include/linux/mod_devicetable.h
View file

@ -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

23
include/uapi/linux/input.h
View file

@ -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 */
/* 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 0x3f
#define ABS_MAX 0x4f
#define ABS_CNT (ABS_MAX+1)
/*