HID: nintendo: add support for md/gen 6B controller

The NSO MD/GEN 6B was a Japan-only controller released which has
6 buttons on the face of the controller. This adds support for this
controller. It still enumerates just like the 3B controller, but
will use extra bits in it's report for the 3 extra controllers. This
also changes the events reported to match the letter on the controller
for the NSO MD/GEN controller. The VID/PID it reports is the same as
the 3B controller.

This also removes a comment on the N64 Controllers which didn't
mean anything.

Signed-off-by: Ryan McClelland <rymcclel@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>

Author: XenuIsWatching

drivers/hid/Kconfig

@@ -787,7 +787,7 @@ config HID_NINTENDO
 	Adds support for the Nintendo Switch Joy-Cons, NSO, Pro Controller.
 	All controllers support bluetooth, and the Pro Controller also supports
 	its USB mode. This also includes support for the Nintendo Switch Online
-	Controllers which include the Genesis, SNES, and N64 controllers.
+	Controllers which include the NES, Genesis, SNES, and N64 controllers.
 
 	To compile this driver as a module, choose M here: the
 	module will be called hid-nintendo.

drivers/hid/hid-nintendo.c

@@ -456,24 +456,20 @@ static const struct joycon_ctlr_button_mapping snescon_button_mappings[] = {
 	{ /* sentinel */ },
 };
 
-/*
- * "A", "B", and "C" are mapped positionally, rather than by label (e.g., "A"
- * gets assigned to BTN_EAST instead of BTN_A).
- */
 static const struct joycon_ctlr_button_mapping gencon_button_mappings[] = {
-	{ BTN_SOUTH,	JC_BTN_A,	},
-	{ BTN_EAST,	JC_BTN_B,	},
-	{ BTN_WEST,	JC_BTN_R,	},
+	{ BTN_A,	JC_BTN_A,	},
+	{ BTN_B,	JC_BTN_B,	},
+	{ BTN_C,	JC_BTN_R,	},
+	{ BTN_X,	JC_BTN_X,	}, /* MD/GEN 6B Only */
+	{ BTN_Y,	JC_BTN_Y,	}, /* MD/GEN 6B Only */
+	{ BTN_Z,	JC_BTN_L,	}, /* MD/GEN 6B Only */
 	{ BTN_SELECT,	JC_BTN_ZR,	},
 	{ BTN_START,	JC_BTN_PLUS,	},
 	{ BTN_MODE,	JC_BTN_HOME,	},
 	{ BTN_Z,	JC_BTN_CAP,	},
 	{ /* sentinel */ },
 };
 
-/*
- * N64's C buttons get assigned to d-pad directions and registered as buttons.
- */
 static const struct joycon_ctlr_button_mapping n64con_button_mappings[] = {
 	{ BTN_A,		JC_BTN_A,	},
 	{ BTN_B,		JC_BTN_B,	},