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: David Herrmann <dh.herrmann@gmail.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 23 insertions, 2 deletions

diff --git a/include/uapi/linux/input.h b/include/uapi/linux/input.h
index d584047b072b..76457eef172a 100644
--- a/include/uapi/linux/input.h
+++ b/include/uapi/linux/input.h
@@ -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)
 
 /*