HID: Add driver for Retrode2 joypad adapter

This driver does 2 things:
- Apply the MULTI_INPUT quirk to create separate joypad device nodes for each one of the 4 connectors.
- Rename the input devices so that their names are different, and allow users to recognise which device corresponds to which physical port, including the SNES (Mario Paint) Mouse.

---

New in v5:
- Rebased
- Mask out SNES mouse's middle button

New in v4:
- Add guard around special Retrode driver, so it still works as it used to if the driver isn't compiled in

New in v3:
- Use devm_kasprintf()
- Return -ENOMEM on failure

New in v2:
- Removed error paths in probe
- Added device to hid_have_special_driver
- Mark N64 ports as using the same device as the SNES joypads

 drivers/hid/Kconfig       |   8 ++++
 drivers/hid/Makefile      |   1 +
 drivers/hid/hid-core.c    |   3 ++
 drivers/hid/hid-ids.h     |   3 ++
 drivers/hid/hid-retrode.c | 100 ++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 115 insertions(+)
 create mode 100644 drivers/hid/hid-retrode.c

index 687705c50794..d409435fc0c2 100644
@@ -741,6 +741,14 @@ config HID_PRIMAX
 	Support for Primax devices that are not fully compliant with the
 	HID standard.
 
+config HID_RETRODE
+	tristate "Retrode"
+	depends on USB_HID
+	---help---
+	Support for
+
+	  * Retrode 2 cartridge and controller adapter
+
 config HID_ROCCAT
 	tristate "Roccat device support"
 	depends on USB_HID

index fef027bc7fa3..9ac08e7ed887 100644
@@ -81,6 +81,7 @@ hid-picolcd-$(CONFIG_DEBUG_FS)		+= hid-picolcd_debugfs.o
 
 obj-$(CONFIG_HID_PLANTRONICS)	+= hid-plantronics.o
 obj-$(CONFIG_HID_PRIMAX)	+= hid-primax.o
+obj-$(CONFIG_HID_RETRODE)	+= hid-retrode.o
 obj-$(CONFIG_HID_ROCCAT)	+= hid-roccat.o hid-roccat-common.o \
 	hid-roccat-arvo.o hid-roccat-isku.o hid-roccat-kone.o \
 	hid-roccat-koneplus.o hid-roccat-konepure.o hid-roccat-kovaplus.o \

index 6e040692f1d8..49b9b4e8bfb4 100644
@@ -2151,6 +2151,9 @@ static const struct hid_device_id hid_have_special_driver[] = {
 #if IS_ENABLED(CONFIG_HID_PRODIKEYS)
 	{ HID_USB_DEVICE(USB_VENDOR_ID_CREATIVELABS, USB_DEVICE_ID_PRODIKEYS_PCMIDI) },
 #endif
+#if IS_ENABLED(CONFIG_HID_RETRODE)
+	{ HID_USB_DEVICE(USB_VENDOR_ID_FUTURE_TECHNOLOGY, USB_DEVICE_ID_RETRODE2) },
+#endif
 #if IS_ENABLED(CONFIG_HID_RMI)
 	{ HID_USB_DEVICE(USB_VENDOR_ID_LENOVO, USB_DEVICE_ID_LENOVO_X1_COVER) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_RAZER, USB_DEVICE_ID_RAZER_BLADE_14) },

index 8ca1e8ce0af2..eabf33199fb2 100644
@@ -383,6 +383,9 @@
 #define USB_VENDOR_ID_FUTABA            0x0547
 #define USB_DEVICE_ID_LED_DISPLAY       0x7000
 
+#define USB_VENDOR_ID_FUTURE_TECHNOLOGY	0x0403
+#define USB_DEVICE_ID_RETRODE2		0x97c1
+
 #define USB_VENDOR_ID_ESSENTIAL_REALITY	0x0d7f
 #define USB_DEVICE_ID_ESSENTIAL_REALITY_P5 0x0100
 

2.13.0

Applied to for-4.13/retrode.

Jiri Kosina
SUSE Labs