Correct a spelling mistake in the Sixaxis HID descriptor comment.
Add an explanation as to why the Sixaxis has so many analog axes and why
some of them are seen as multi-touch axes.
Signed-off-by: Frank Praznik <frank.praznik@xxxxxxxxx>
---
drivers/hid/hid-sony.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/hid/hid-sony.c b/drivers/hid/hid-sony.c
index 9370509..aeb8b41 100644
--- a/drivers/hid/hid-sony.c
+++ b/drivers/hid/hid-sony.c
@@ -59,9 +59,16 @@
#define MAX_LEDS 4
+/*
+ * The Sixaxis reports both digital and analog values for each button on the
+ * controller except for Start, Select and the PS button. The controller ends
+ * up reporting 27 axes which causes them to spill over into the multi-touch
+ * axis values. Additionally, the controller only has 20 actual, physical axes
+ * so there are several unused axes in between the used ones.
+ */
static __u8 sixaxis_rdesc[] = {
0x05, 0x01, /* Usage Page (Desktop), */
- 0x09, 0x04, /* Usage (Joystik), */
+ 0x09, 0x04, /* Usage (Joystick), */
0xA1, 0x01, /* Collection (Application), */
0xA1, 0x02, /* Collection (Logical), */
0x85, 0x01, /* Report ID (1), */
--
2.1.0
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