[PATCH] Input: xpad - add Lenovo Legion Go controllers

[Brenton Simpson <appsforartists@google.com>]

When the controllers are both attached (or detached), they appear as
0x17ef, 0x6182.  When only one is attached, they appear as
0x17ef, 0x6184.

84 (mixed attachment) is already recognized as a gamepad by Linux.  This
patch adds 82 (both attached/detached).

These controllers have many more buttons than is typical.  With this
patch, here's what's functional when it presents as 82:

Recognized:

- X, Y, A, B
- both analog sticks, including L3/R3
- D-pad
- menu and capture buttons
- rumble

Not yet recognized:

- start, select
- 4 rear paddle buttons (Y1, Y2, Y3, M3)
- gyroscope

(There are also non-functional buttons when reporting as 84 that are
out-of-scope for this patch.)

Signed-off-by: Brenton Simpson <appsforartists@google.com>
---
 drivers/input/joystick/xpad.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/input/joystick/xpad.c b/drivers/input/joystick/xpad.c
index f5c21565bb3cec..ecfcea8740a009 100644
--- a/drivers/input/joystick/xpad.c
+++ b/drivers/input/joystick/xpad.c
@@ -127,6 +127,7 @@ static const struct xpad_device {
  u8 mapping;
  u8 xtype;
 } xpad_device[] = {
+ { 0x17ef, 0x6182, "Lenovo Legion Go Controller (unified)", 0, XTYPE_XBOX360 },
  { 0x0079, 0x18d4, "GPD Win 2 X-Box Controller", 0, XTYPE_XBOX360 },
  { 0x03eb, 0xff01, "Wooting One (Legacy)", 0, XTYPE_XBOX360 },
  { 0x03eb, 0xff02, "Wooting Two (Legacy)", 0, XTYPE_XBOX360 },
@@ -459,6 +460,7 @@ static const signed short xpad_btn_paddles[] = {

 static const struct usb_device_id xpad_table[] = {
  { USB_INTERFACE_INFO('X', 'B', 0) }, /* Xbox USB-IF not-approved class */
+ XPAD_XBOX360_VENDOR(0x17ef), /* Lenovo */
  XPAD_XBOX360_VENDOR(0x0079), /* GPD Win 2 controller */
  XPAD_XBOX360_VENDOR(0x03eb), /* Wooting Keyboards (Legacy) */
  XPAD_XBOXONE_VENDOR(0x03f0), /* HP HyperX Xbox One controllers */