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@xxxxxxxxx>
---
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
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