Add support for Gamecube keyboards

Makefile.inc

@@ -1,4 +1,4 @@
-OBJS=main.o usb.o usbpad.o mappings.o gcn64_protocol.o n64.o gamecube.o usart1.o bootloader.o eeprom.o config.o hiddata.o usbstrings.o intervaltimer.o intervaltimer2.o version.o gcn64txrx0.o gcn64txrx1.o gcn64txrx2.o gcn64txrx3.o gamepads.o stkchk.o
-VERSIONSTR=\"3.5.2\"
-VERSIONSTR_SHORT=\"3.5\"
-VERSIONBCD=0x0352
+OBJS=main.o usb.o usbpad.o mappings.o gcn64_protocol.o n64.o gamecube.o usart1.o bootloader.o eeprom.o config.o hiddata.o usbstrings.o intervaltimer.o intervaltimer2.o version.o gcn64txrx0.o gcn64txrx1.o gcn64txrx2.o gcn64txrx3.o gamepads.o stkchk.o gc_kb.o
+VERSIONSTR=\"3.6.0\"
+VERSIONSTR_SHORT=\"3.6\"
+VERSIONBCD=0x0360

changelog.txt

@@ -1,3 +1,6 @@
+- November 6, 2018 : Version 3.6.0
+  - Add gamecube keyboard support
+
 - September 18, 2018 : Version 3.5.2
   - Improve PID (force feedback) implementation
   - Implement reset firmware command

gamecube.c

@@ -24,7 +24,9 @@
 
 /*********** prototypes *************/
 static void gamecubeInit(unsigned char chn);
+static void gamecubeInitKB(unsigned char chn);
 static char gamecubeUpdate(unsigned char chn);
+static char gamecubeUpdateKB(unsigned char chn);
 static char gamecubeChanged(unsigned char chn);
 
 static char gc_rumbling[GAMEPAD_MAX_CHANNELS] = { };
@@ -39,6 +41,11 @@ static void gamecubeInit(unsigned char chn)
 	gamecubeUpdate(chn);
 }
 
+static void gamecubeInitKB(unsigned char chn)
+{
+	gamecubeUpdateKB(chn);
+}
+
 void gc_decodeAnswer(unsigned char chn, unsigned char data[8])
 {
 	unsigned char x,y,cx,cy;
@@ -115,6 +122,39 @@ void gc_decodeAnswer(unsigned char chn, unsigned char data[8])
 	}
 }
 
+static char gamecubeUpdateKB(unsigned char chn)
+{
+	unsigned char tmpdata[GC_GETSTATUS_REPLY_LENGTH];
+	unsigned char count;
+	unsigned char i, lrc;
+
+	tmpdata[0] = GC_POLL_KB1;
+	tmpdata[1] = GC_POLL_KB2;
+	tmpdata[2] = GC_POLL_KB3;
+
+	count = gcn64_transaction(chn, tmpdata, 3, tmpdata, GC_GETSTATUS_REPLY_LENGTH);
+	if (count != GC_GETSTATUS_REPLY_LENGTH) {
+		return 1;
+	}
+
+	// Compute LRC
+	for (i=0, lrc=0; i<6; i++) {
+		lrc ^= tmpdata[i];
+	}
+
+	if (tmpdata[7] != lrc) {
+		return 1; // LRC error
+	}
+
+	// Ok, fill the report
+	last_built_report[chn].pad_type = PAD_TYPE_GC_KB;
+	for (i=0; i<3; i++) {
+		last_built_report[chn].gckb.keys[i] = tmpdata[4+i];
+	}
+
+	return 0;
+}
+
 static char gamecubeUpdate(unsigned char chn)
 {
 	unsigned char tmpdata[GC_GETSTATUS_REPLY_LENGTH];
@@ -181,3 +221,17 @@ Gamepad *gamecubeGetGamepad(void)
 {
 	return &GamecubeGamepad;
 }
+
+Gamepad GamecubeKeyboard = {
+	.init					= gamecubeInitKB,
+	.update					= gamecubeUpdateKB,
+	.changed				= gamecubeChanged,
+	.getReport				= gamecubeGetReport,
+	.probe					= gamecubeProbe,
+};
+
+Gamepad *gamecubeGetKeyboard(void)
+{
+	return &GamecubeKeyboard;
+}
+

gamecube.h

@@ -1,4 +1,5 @@
 #include "gamepads.h"
 
 Gamepad *gamecubeGetGamepad(void);
+Gamepad *gamecubeGetKeyboard(void);
 

gamepads.h

@@ -6,6 +6,7 @@
 #define PAD_TYPE_NONE       0
 #define PAD_TYPE_N64        4
 #define PAD_TYPE_GAMECUBE   5
+#define PAD_TYPE_GC_KB	  	6
 
 #define N64_RAW_SIZE        4
 #define GC_RAW_SIZE         8
@@ -69,11 +70,17 @@ typedef struct _gc_pad_data {
 
 #define GC_ALL_BUTTONS      (GC_BTN_START|GC_BTN_Y|GC_BTN_X|GC_BTN_B|GC_BTN_A|GC_BTN_L|GC_BTN_R|GC_BTN_Z|GC_BTN_DPAD_UP|GC_BTN_DPAD_DOWN|GC_BTN_DPAD_RIGHT|GC_BTN_DPAD_LEFT)
 
+typedef struct _gc_keyboard_data {
+	unsigned char pad_type;
+	unsigned char keys[3];
+} gc_keyboard_data;
+
 typedef struct _gamepad_data {
 	union {
 		unsigned char pad_type; // PAD_TYPE_*
 		n64_pad_data n64;
 		gc_pad_data gc;
+		gc_keyboard_data gckb;
 	};
 } gamepad_data;
 

gc_kb.c

@@ -0,0 +1,93 @@
+/*	gc_n64_usb : Gamecube or N64 controller to USB firmware
+	Copyright (C) 2007-2013  Raphael Assenat <raph@raphnet.net>
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include <avr/pgmspace.h>
+#include "gc_kb.h"
+#include "hid_keycodes.h"
+#include "gcn64_protocol.h"
+
+
+// http://www2d.biglobe.ne.jp/~msyk/keyboard/layout/usbkeycode.html
+
+static const unsigned char gc_to_hid_table[] PROGMEM = {
+	GC_KEY_RESERVED,		HID_KB_NOEVENT,
+	GC_KEY_HOME,			HID_KB_HOME,
+	GC_KEY_END,				HID_KB_END,
+	GC_KEY_PGUP,			HID_KB_PGUP,
+	GC_KEY_PGDN,			HID_KB_PGDN,
+	GC_KEY_SCROLL_LOCK,		HID_KB_SCROLL_LOCK,
+	GC_KEY_DASH_UNDERSCORE, HID_KB_DASH_UNDERSCORE,
+	GC_KEY_PLUS_EQUAL,		HID_KB_EQUAL_PLUS,
+	GC_KEY_YEN,				HID_KB_INTERNATIONAL3,
+	GC_KEY_OPEN_BRKT_BRACE,	HID_KB_OPEN_BRKT_BRACE,
+	GC_KEY_SEMI_COLON_COLON,HID_KB_SEMI_COLON_COLON,
+	GC_KEY_QUOTES,			HID_KB_QUOTES,
+	GC_KEY_CLOSE_BRKT_BRACE,HID_KB_CLOSE_BRKT_BRACE,
+	GC_KEY_BRACKET_MU,		HID_KB_NONUS_HASH_TILDE,
+	GC_KEY_COMMA_ST,		HID_KB_COMMA_SMALLER_THAN,
+	GC_KEY_PERIOD_GT,		HID_KB_PERIOD_GREATER_THAN,
+	GC_KEY_SLASH_QUESTION,	HID_KB_SLASH_QUESTION,
+	GC_KEY_INTERNATIONAL1,	HID_KB_INTERNATIONAL1,
+	GC_KEY_ESC,				HID_KB_ESCAPE,
+	GC_KEY_INSERT,			HID_KB_INSERT,
+	GC_KEY_DELETE,			HID_KB_DELETE_FORWARD,
+	GC_KEY_HANKAKU,			HID_KB_GRAVE_ACCENT_AND_TILDE,
+	GC_KEY_BACKSPACE,		HID_KB_BACKSPACE,
+	GC_KEY_TAB,				HID_KB_TAB,
+	GC_KEY_CAPS_LOCK,		HID_KB_CAPS_LOCK,
+	GC_KEY_MUHENKAN,		HID_KB_INTERNATIONAL5,
+	GC_KEY_SPACE,			HID_KB_SPACE,
+	GC_KEY_HENKAN,			HID_KB_INTERNATIONAL4,
+	GC_KEY_KANA,			HID_KB_INTERNATIONAL2,
+	GC_KEY_LEFT,			HID_KB_LEFT_ARROW,
+	GC_KEY_DOWN,			HID_KB_DOWN_ARROW,
+	GC_KEY_UP,				HID_KB_UP_ARROW,
+	GC_KEY_RIGHT,			HID_KB_RIGHT_ARROW,
+	GC_KEY_ENTER,			HID_KB_ENTER,
+
+	/* "shift" keys */
+	GC_KEY_LEFT_SHIFT,		HID_KB_LEFT_SHIFT,
+	GC_KEY_RIGHT_SHIFT,		HID_KB_RIGHT_SHIFT,
+	GC_KEY_LEFT_CTRL,		HID_KB_LEFT_CONTROL,
+
+	/* This keyboard only has a left alt key. But as right alt is required to access some
+	 * functions on japanese keyboards, I map the key to right alt.
+	 *
+	 * eg: RO-MAJI on the hiragana/katakana key */
+	GC_KEY_LEFT_ALT,		HID_KB_RIGHT_ALT,
+};
+
+unsigned char gcKeycodeToHID(unsigned char gc_code)
+{
+	int i;
+
+	if (gc_code >= GC_KEY_A && gc_code <= GC_KEY_0) {
+		// Note: This works since A-Z, 1-9, 0 have consecutive keycode values.
+		return (gc_code - GC_KEY_A) + HID_KB_A;
+	}
+	if (gc_code >= GC_KEY_F1 && gc_code <= GC_KEY_F12) {
+		return (gc_code - GC_KEY_F1) + HID_KB_F1;
+	}
+
+	for (i=0; i<sizeof(gc_to_hid_table); i++) {
+		if (pgm_read_byte(gc_to_hid_table + i*2) == gc_code) {
+			return pgm_read_byte(gc_to_hid_table + i*2 + 1);
+		}
+	}
+
+	return 0x38; // HID /? key for unknown keys
+}
+

gc_kb.h

@@ -0,0 +1,3 @@
+
+unsigned char gcKeycodeToHID(unsigned char gc_code);
+

hid_keycodes.h

@@ -0,0 +1,110 @@
+#ifndef _hid_keycodes_h__
+#define _hid_keycodes_h__
+
+/* From Hut1_12.pdf : Universal Serial Bus HID Usage Tables, 
+ * section 10 Keyboard/Keypad Page (0x07) */
+
+#define HID_KB_NOEVENT	0x00
+
+#define HID_KB_A		0x04
+#define HID_KB_B		0x05
+#define HID_KB_C		0x06
+#define HID_KB_D		0x07
+#define HID_KB_E		0x08
+#define HID_KB_F		0x09
+#define HID_KB_G		0x0a
+#define HID_KB_H		0x0b
+#define HID_KB_I		0x0c
+#define HID_KB_J		0x0d
+#define HID_KB_K		0x0e
+#define HID_KB_L		0x0f
+#define HID_KB_M		0x10
+#define HID_KB_N		0x11
+#define HID_KB_O		0x12
+#define HID_KB_P		0x13
+#define HID_KB_Q		0x14
+#define HID_KB_R		0x15
+#define HID_KB_S		0x16
+#define HID_KB_T		0x17
+#define HID_KB_U		0x18
+#define HID_KB_V		0x19
+#define HID_KB_W		0x1a
+#define HID_KB_X		0x1b
+#define HID_KB_Y		0x1c
+#define HID_KB_Z		0x1d
+
+#define HID_KB_1		0x1e
+#define HID_KB_2		0x1f
+#define HID_KB_3		0x20
+#define HID_KB_4		0x21
+#define HID_KB_5		0x22
+#define HID_KB_6		0x23
+#define HID_KB_7		0x24
+#define HID_KB_8		0x25
+#define HID_KB_9		0x26
+#define HID_KB_0		0x27
+
+#define HID_KB_ESCAPE			0x29
+#define HID_KB_BACKSPACE		0x2a
+#define HID_KB_TAB				0x2b
+
+#define HID_KB_SPACE			0x2c
+#define HID_KB_DASH_UNDERSCORE	0x2d
+#define HID_KB_EQUAL_PLUS		0x2e
+#define HID_KB_OPEN_BRKT_BRACE	0x2f
+
+#define HID_KB_CLOSE_BRKT_BRACE	0x30
+#define HID_KB_NONUS_HASH_TILDE	0x32
+#define HID_KB_SEMI_COLON_COLON	0x33
+#define HID_KB_QUOTES			0x34
+#define HID_KB_GRAVE_ACCENT_AND_TILDE	0x35
+#define HID_KB_COMMA_SMALLER_THAN		0x36
+#define HID_KB_PERIOD_GREATER_THAN		0x37
+#define HID_KB_SLASH_QUESTION	0x38
+#define HID_KB_CAPS_LOCK		0x39
+
+#define HID_KB_F1				0x3a
+#define HID_KB_F2				0x3b
+#define HID_KB_F3				0x3c
+#define HID_KB_F4				0x3d
+#define HID_KB_F5				0x3e
+#define HID_KB_F6				0x3f
+#define HID_KB_F7				0x40
+#define HID_KB_F8				0x41
+#define HID_KB_F9				0x42
+#define HID_KB_F10				0x43
+#define HID_KB_F11				0x44
+#define HID_KB_F12				0x45
+
+#define HID_KB_SCROLL_LOCK		0x47
+#define HID_KB_INSERT			0x49
+#define HID_KB_HOME				0x4a
+#define HID_KB_PGUP				0x4b
+#define HID_KB_DELETE_FORWARD	0x4c
+#define HID_KB_END				0x4d
+#define HID_KB_PGDN				0x4e
+
+#define HID_KB_RIGHT_ARROW		0x4f
+#define HID_KB_LEFT_ARROW		0x50
+#define HID_KB_DOWN_ARROW		0x51
+#define HID_KB_UP_ARROW			0x52
+
+#define HID_KB_ENTER			0x28
+
+#define HID_KB_INTERNATIONAL1	0x87
+#define HID_KB_INTERNATIONAL2	0x88
+#define HID_KB_INTERNATIONAL3	0x89
+#define HID_KB_INTERNATIONAL4	0x8a
+#define HID_KB_INTERNATIONAL5	0x8b
+
+#define HID_KB_LEFT_CONTROL		0xe0
+#define HID_KB_LEFT_SHIFT		0xe1
+#define HID_KB_LEFT_ALT			0xe2
+#define HID_KB_LEFT_GUI			0xe3
+#define HID_KB_RIGHT_CONTROL	0xe4
+#define HID_KB_RIGHT_SHIFT		0xe5
+#define HID_KB_RIGHT_ALT		0xe6
+#define HID_KB_RIGHT_GUI		0xe7
+
+#endif // _hid_keycodes_h__
+

main.c

@@ -42,13 +42,19 @@
 
 #define MAX_PLAYERS		2
 
-#define GCN64_USB_PID	0x0038
-#define N64_USB_PID		0x0039
-#define GC_USB_PID		0x003A
+#define GCN64_USB_PID	0x0060
+#define N64_USB_PID		0x0061
+#define GC_USB_PID		0x0062
 
-#define DUAL_GCN64_USB_PID	0x003B
-#define DUAL_N64_USB_PID	0x003C
-#define DUAL_GC_USB_PID		0x003D
+#define DUAL_GCN64_USB_PID	0x0063
+#define DUAL_N64_USB_PID	0x0064
+#define DUAL_GC_USB_PID		0x0065
+
+#define KEYBOARD_PID		0x0066
+#define KEYBOARD_PID2		0x0067
+#define KEYBOARD_JS_PID		0x0068
+
+int keyboard_main(void);
 
 /* Those .c files are included rather than linked for we
  * want the sizeof() operator to work on the arrays */
@@ -139,6 +145,77 @@ static const struct cfg0 cfg0 PROGMEM = {
 	},
 };
 
+static const struct cfg0 cfg0_kb PROGMEM = {
+	.configdesc = {
+		.bLength = sizeof(struct usb_configuration_descriptor),
+		.bDescriptorType = CONFIGURATION_DESCRIPTOR,
+		.wTotalLength = sizeof(cfg0), // includes all descriptors returned together
+		.bNumInterfaces = 1 + 1, // one interface per player + one management interface
+		.bConfigurationValue = 1,
+		.bmAttributes = CFG_DESC_ATTR_RESERVED, // set Self-powred and remote-wakeup here if needed.
+		.bMaxPower = 25, // for 50mA
+	},
+
+	// Main interface, HID Keyboard
+	.interface = {
+		.bLength = sizeof(struct usb_interface_descriptor),
+		.bDescriptorType = INTERFACE_DESCRIPTOR,
+		.bInterfaceNumber = 0,
+		.bAlternateSetting = 0,
+		.bNumEndpoints = 1,
+		.bInterfaceClass = USB_DEVICE_CLASS_HID,
+		.bInterfaceSubClass = HID_SUBCLASS_NONE,
+		.bInterfaceProtocol = HID_PROTOCOL_NONE,
+	},
+	.hid = {
+		.bLength = sizeof(struct usb_hid_descriptor),
+		.bDescriptorType = HID_DESCRIPTOR,
+		.bcdHid = 0x0101,
+		.bCountryCode = HID_COUNTRY_NOT_SUPPORTED,
+		.bNumDescriptors = 1, // Only a report descriptor
+		.bClassDescriptorType = REPORT_DESCRIPTOR,
+		.wClassDescriptorLength = sizeof(gcKeyboardReport),
+	},
+	.ep1_in = {
+		.bLength = sizeof(struct usb_endpoint_descriptor),
+		.bDescriptorType = ENDPOINT_DESCRIPTOR,
+		.bEndpointAddress = USB_RQT_DEVICE_TO_HOST | 1, // 0x81
+		.bmAttributes = TRANSFER_TYPE_INT,
+		.wMaxPacketsize = 16,
+		.bInterval = LS_FS_INTERVAL_MS(1),
+	},
+
+	// Second HID interface for config and update
+	.interface_admin = {
+		.bLength = sizeof(struct usb_interface_descriptor),
+		.bDescriptorType = INTERFACE_DESCRIPTOR,
+		.bInterfaceNumber = 1,
+		.bAlternateSetting = 0,
+		.bNumEndpoints = 1,
+		.bInterfaceClass = USB_DEVICE_CLASS_HID,
+		.bInterfaceSubClass = HID_SUBCLASS_NONE,
+		.bInterfaceProtocol = HID_PROTOCOL_NONE,
+	},
+	.hid_data = {
+		.bLength = sizeof(struct usb_hid_descriptor),
+		.bDescriptorType = HID_DESCRIPTOR,
+		.bcdHid = 0x0101,
+		.bCountryCode = HID_COUNTRY_NOT_SUPPORTED,
+		.bNumDescriptors = 1, // Only a report descriptor
+		.bClassDescriptorType = REPORT_DESCRIPTOR,
+		.wClassDescriptorLength = sizeof(dataHidReport),
+	},
+	.ep2_in = {
+		.bLength = sizeof(struct usb_endpoint_descriptor),
+		.bDescriptorType = ENDPOINT_DESCRIPTOR,
+		.bEndpointAddress = USB_RQT_DEVICE_TO_HOST | 2, // 0x82
+		.bmAttributes = TRANSFER_TYPE_INT,
+		.wMaxPacketsize = 64,
+		.bInterval = LS_FS_INTERVAL_MS(1),
+	},
+};
+
+
 struct cfg0_2p {
 	struct usb_configuration_descriptor configdesc;
 	struct usb_interface_descriptor interface;
@@ -253,6 +330,107 @@ static const struct cfg0_2p cfg0_2p PROGMEM = {
 	},
 };
 
+static const struct cfg0_2p cfg0_2p_keyboard PROGMEM = {
+	.configdesc = {
+		.bLength = sizeof(struct usb_configuration_descriptor),
+		.bDescriptorType = CONFIGURATION_DESCRIPTOR,
+		.wTotalLength = sizeof(cfg0_2p), // includes all descriptors returned together
+		.bNumInterfaces = 2 + 1, // one interface per player + one management interface
+		.bConfigurationValue = 1,
+		.bmAttributes = CFG_DESC_ATTR_RESERVED, // set Self-powred and remote-wakeup here if needed.
+		.bMaxPower = 25, // for 50mA
+	},
+
+	// Joystick interface
+	.interface = {
+		.bLength = sizeof(struct usb_interface_descriptor),
+		.bDescriptorType = INTERFACE_DESCRIPTOR,
+		.bInterfaceNumber = 0,
+		.bAlternateSetting = 0,
+		.bNumEndpoints = 1,
+		.bInterfaceClass = USB_DEVICE_CLASS_HID,
+		.bInterfaceSubClass = HID_SUBCLASS_NONE,
+		.bInterfaceProtocol = HID_PROTOCOL_NONE,
+	},
+	.hid = {
+		.bLength = sizeof(struct usb_hid_descriptor),
+		.bDescriptorType = HID_DESCRIPTOR,
+		.bcdHid = 0x0101,
+		.bCountryCode = HID_COUNTRY_NOT_SUPPORTED,
+		.bNumDescriptors = 1, // Only a report descriptor
+		.bClassDescriptorType = REPORT_DESCRIPTOR,
+		.wClassDescriptorLength = sizeof(gcn64_usbHidReportDescriptor),
+	},
+	.ep1_in = {
+		.bLength = sizeof(struct usb_endpoint_descriptor),
+		.bDescriptorType = ENDPOINT_DESCRIPTOR,
+		.bEndpointAddress = USB_RQT_DEVICE_TO_HOST | 1, // 0x81
+		.bmAttributes = TRANSFER_TYPE_INT,
+		.wMaxPacketsize = 16,
+		.bInterval = LS_FS_INTERVAL_MS(1),
+	},
+
+	// HID Keyboard interface
+	.interface_p2 = {
+		.bLength = sizeof(struct usb_interface_descriptor),
+		.bDescriptorType = INTERFACE_DESCRIPTOR,
+		.bInterfaceNumber = 1,
+		.bAlternateSetting = 0,
+		.bNumEndpoints = 1,
+		.bInterfaceClass = USB_DEVICE_CLASS_HID,
+		.bInterfaceSubClass = HID_SUBCLASS_NONE,
+		.bInterfaceProtocol = HID_PROTOCOL_NONE,
+	},
+	.hid_p2 = {
+		.bLength = sizeof(struct usb_hid_descriptor),
+		.bDescriptorType = HID_DESCRIPTOR,
+		.bcdHid = 0x0101,
+		.bCountryCode = HID_COUNTRY_NOT_SUPPORTED,
+		.bNumDescriptors = 1, // Only a report descriptor
+		.bClassDescriptorType = REPORT_DESCRIPTOR,
+		.wClassDescriptorLength = sizeof(gcKeyboardReport),
+	},
+	.ep2_in = {
+		.bLength = sizeof(struct usb_endpoint_descriptor),
+		.bDescriptorType = ENDPOINT_DESCRIPTOR,
+		.bEndpointAddress = USB_RQT_DEVICE_TO_HOST | 2, // 0x82
+		.bmAttributes = TRANSFER_TYPE_INT,
+		.wMaxPacketsize = 16,
+		.bInterval = LS_FS_INTERVAL_MS(1),
+	},
+
+	// Second HID interface for config and update
+	.interface_admin = {
+		.bLength = sizeof(struct usb_interface_descriptor),
+		.bDescriptorType = INTERFACE_DESCRIPTOR,
+		.bInterfaceNumber = 2,
+		.bAlternateSetting = 0,
+		.bNumEndpoints = 1,
+		.bInterfaceClass = USB_DEVICE_CLASS_HID,
+		.bInterfaceSubClass = HID_SUBCLASS_NONE,
+		.bInterfaceProtocol = HID_PROTOCOL_NONE,
+	},
+	.hid_data = {
+		.bLength = sizeof(struct usb_hid_descriptor),
+		.bDescriptorType = HID_DESCRIPTOR,
+		.bcdHid = 0x0101,
+		.bCountryCode = HID_COUNTRY_NOT_SUPPORTED,
+		.bNumDescriptors = 1, // Only a report descriptor
+		.bClassDescriptorType = REPORT_DESCRIPTOR,
+		.wClassDescriptorLength = sizeof(dataHidReport),
+	},
+	.ep3_in = {
+		.bLength = sizeof(struct usb_endpoint_descriptor),
+		.bDescriptorType = ENDPOINT_DESCRIPTOR,
+		.bEndpointAddress = USB_RQT_DEVICE_TO_HOST | 3, // 0x83
+		.bmAttributes = TRANSFER_TYPE_INT,
+		.wMaxPacketsize = 64,
+		.bInterval = LS_FS_INTERVAL_MS(1),
+	},
+};
+
+
+
 struct usb_device_descriptor device_descriptor = {
 	.bLength = sizeof(struct usb_device_descriptor),
 	.bDescriptorType = DEVICE_DESCRIPTOR,
@@ -376,13 +554,13 @@ Gamepad *detectPad(unsigned char chn)
 			return NULL;
 
 		case CONTROLLER_IS_N64:
-			printf("Detected N64 controller\n");
 			return n64GetGamepad();
-			break;
 
 		case CONTROLLER_IS_GC:
-			printf("Detected GC controller\n");
 			return gamecubeGetGamepad();
+
+		case CONTROLLER_IS_GC_KEYBOARD:
+			return gamecubeGetKeyboard();
 	}
 
 	return NULL;
@@ -418,13 +596,48 @@ static void forceVibration(uint8_t channel, uint8_t force)
 
 static uint8_t getSupportedModes(uint8_t *dst)
 {
-	dst[0] = CFG_MODE_STANDARD;
-	dst[1] = CFG_MODE_N64_ONLY;
-	dst[2] = CFG_MODE_GC_ONLY;
-	dst[3] = CFG_MODE_2P_STANDARD;
-	dst[4] = CFG_MODE_2P_N64_ONLY;
-	dst[5] = CFG_MODE_2P_GC_ONLY;
-	return 6;
+	uint8_t idx = 0;
+
+	switch (g_eeprom_data.cfg.mode)
+	{
+		// Allow toggling between keyboard and joystick modes on
+		// single-port gamecube adapter
+		case CFG_MODE_GC_ONLY:
+		case CFG_MODE_KEYBOARD:
+			dst[idx++] = CFG_MODE_GC_ONLY;
+			dst[idx++] = CFG_MODE_KEYBOARD;
+			break;
+
+		// Allow toggling between two joysticks and joystick + keyboard modes
+		// on dual-port gamecube adapter
+		case CFG_MODE_2P_GC_ONLY:
+		case CFG_MODE_KB_AND_JS:
+			dst[idx++] = CFG_MODE_2P_GC_ONLY;
+			dst[idx++] = CFG_MODE_KB_AND_JS;
+			break;
+
+		// On N64/GC adapters, there is a GC port so we should support
+		// keyboards there. Use KEYBOARD_2 config here to avoid mixup
+		// with the GC-only adapter variation.
+		case CFG_MODE_STANDARD:
+		case CFG_MODE_KEYBOARD_2:
+			dst[idx++] = CFG_MODE_STANDARD;
+			dst[idx++] = CFG_MODE_KEYBOARD_2;
+			break;
+
+		default:
+			dst[idx++] = CFG_MODE_STANDARD;
+			dst[idx++] = CFG_MODE_N64_ONLY;
+			dst[idx++] = CFG_MODE_GC_ONLY;
+			dst[idx++] = CFG_MODE_2P_STANDARD;
+			dst[idx++] = CFG_MODE_2P_N64_ONLY;
+			dst[idx++] = CFG_MODE_2P_GC_ONLY;
+			dst[idx++] = CFG_MODE_KEYBOARD;
+			dst[idx++] = CFG_MODE_KB_AND_JS;
+			break;
+	}
+
+	return idx;
 }
 
 static struct hiddata_ops hiddata_ops = {
@@ -491,6 +704,12 @@ int main(void)
 			device_descriptor.idProduct = DUAL_GC_USB_PID;
 			num_players = 2;
 			break;
+
+		case CFG_MODE_KB_AND_JS:
+		case CFG_MODE_KEYBOARD:
+		case CFG_MODE_KEYBOARD_2:
+			keyboard_main();
+			break;
 	}
 
 	// 2-players common
@@ -623,3 +842,204 @@ int main(void)
 
 	return 0;
 }
+
+int keyboard_main(void)
+{
+	Gamepad *pads[MAX_PLAYERS] = { };
+	gamepad_data pad_data;
+	uint8_t gamepad_vibrate = 0;
+	uint8_t state = STATE_WAIT_POLLTIME;
+	uint8_t channel;
+	uint8_t num_players = 1;
+	uint8_t i;
+
+	hwinit();
+	usart1_init();
+	eeprom_init();
+	intervaltimer_init();
+	intervaltimer2_init();
+	stkchk_init();
+
+	switch (g_eeprom_data.cfg.mode)
+	{
+		default:
+		case CFG_MODE_KEYBOARD_2:
+			usbstrings_changeProductString_P(PSTR("KB to USB v"VERSIONSTR_SHORT));
+			device_descriptor.idProduct = KEYBOARD_PID2;
+
+			usb_params.configdesc = (PGM_VOID_P)&cfg0_kb;
+			usb_params.configdesc_ttllen = sizeof(cfg0_kb);
+
+			// replace Joystick report descriptor by keyboard
+			usb_params.hid_params[0].reportdesc = gcKeyboardReport;
+			usb_params.hid_params[0].reportdesc_len = sizeof(gcKeyboardReport);
+			break;
+
+		case CFG_MODE_KEYBOARD:
+			usbstrings_changeProductString_P(PSTR("GC KB to USB v"VERSIONSTR_SHORT));
+			device_descriptor.idProduct = KEYBOARD_PID;
+
+			usb_params.configdesc = (PGM_VOID_P)&cfg0_kb;
+			usb_params.configdesc_ttllen = sizeof(cfg0_kb);
+
+			// replace Joystick report descriptor by keyboard
+			usb_params.hid_params[0].reportdesc = gcKeyboardReport;
+			usb_params.hid_params[0].reportdesc_len = sizeof(gcKeyboardReport);
+			break;
+
+		case CFG_MODE_KB_AND_JS:
+			usbstrings_changeProductString_P(PSTR("GC KB+JS to USB v"VERSIONSTR_SHORT));
+			device_descriptor.idProduct = KEYBOARD_JS_PID;
+
+			usb_params.configdesc = (PGM_VOID_P)&cfg0_2p_keyboard;
+			usb_params.configdesc_ttllen = sizeof(cfg0_2p_keyboard);
+
+			// Move the management interface to the last position
+			memcpy(usb_params.hid_params + 2, usb_params.hid_params + 1, sizeof(struct usb_hid_parameters));
+			// Add a second player interface between them (still a joystick)
+			memcpy(usb_params.hid_params + 1, usb_params.hid_params + 0, sizeof(struct usb_hid_parameters));
+			// Convert second Joystick report descriptor to a keyboard
+			usb_params.hid_params[1].reportdesc = gcKeyboardReport;
+			usb_params.hid_params[1].reportdesc_len = sizeof(gcKeyboardReport);
+
+			usb_params.n_hid_interfaces = 3;
+			num_players = 2;
+
+			break;
+	}
+
+	for (i=0; i<num_players; i++) {
+		usbpad_init(&usbpads[i]);
+		usb_params.hid_params[i].ctx = &usbpads[i];
+	}
+
+	sei();
+	usb_init(&usb_params);
+
+	// Timebase for force feedback 'loop count'
+	intervaltimer2_set16ms();
+
+	while (1)
+	{
+		static char last_v[MAX_PLAYERS] = { };
+
+		if (stkchk_verify()) {
+			enterBootLoader();
+		}
+
+		usb_doTasks();
+		hiddata_doTask(&hiddata_ops);
+		// Run vibration tasks
+		if (intervaltimer2_get()) {
+			for (channel=0; channel < num_players; channel++) {
+				usbpad_vibrationTask(&usbpads[channel]);
+			}
+		}
+
+		switch(state)
+		{
+			case STATE_WAIT_POLLTIME:
+				if (!g_polling_suspended) {
+					intervaltimer_set(g_eeprom_data.cfg.poll_interval[0]);
+					if (intervaltimer_get()) {
+						state = STATE_POLL_PAD;
+					}
+				}
+				break;
+
+			case STATE_POLL_PAD:
+				for (channel=0; channel<num_players; channel++)
+				{
+					/* Try to auto-detect controller if none*/
+					if (!pads[channel]) {
+						pads[channel] = detectPad(channel);
+						if (pads[channel] && (pads[channel]->hotplug)) {
+							// For gamecube, this make sure the next
+							// analog values we read become the center
+							// reference.
+							pads[channel]->hotplug(channel);
+						}
+					}
+
+					/* Read from the pad by calling update */
+					if (pads[channel]) {
+						if (pads[channel]->update(channel)) {
+							error_count[channel]++;
+							if (error_count[channel] > MAX_READ_ERRORS) {
+								pads[channel] = NULL;
+								error_count[channel] = 0;
+								continue;
+							}
+						} else {
+							error_count[channel]=0;
+						}
+
+						if (pads[channel]->changed(channel))
+						{
+							pads[channel]->getReport(channel, &pad_data);
+
+							if ((num_players == 1) && (channel == 0)) {
+								// single-port adapter in keyboard mode (kb in port 1)
+								usbpad_update_kb(&usbpads[channel], &pad_data);
+							} else if ((num_players == 2) && (channel == 1)) {
+								// dual-port adapter in keyboard mode (kb in port 2)
+								usbpad_update_kb(&usbpads[channel], &pad_data);
+							} else {
+								usbpad_update(&usbpads[channel], &pad_data);
+							}
+							state = STATE_WAIT_INTERRUPT_READY;
+							continue;
+						}
+					} else {
+						/* Just make sure the gamepad state holds valid data
+						 * to appear inactive (no buttons and axes in neutral) */
+						usbpad_update(&usbpads[channel], NULL);
+					}
+				}
+				/* If there were change on any of the gamepads, state will
+				 * be set to STATE_WAIT_INTERRUPT_READY. Otherwise, go back
+				 * to WAIT_POLLTIME. */
+				if (state == STATE_POLL_PAD) {
+					state = STATE_WAIT_POLLTIME;
+				}
+				break;
+
+			case STATE_WAIT_INTERRUPT_READY:
+				/* Wait until one of the interrupt endpoint is ready */
+				if (usb_interruptReady_ep1() || (num_players>1 && usb_interruptReady_ep2())) {
+					state = STATE_TRANSMIT;
+				}
+				break;
+
+			case STATE_TRANSMIT:
+				if (usb_interruptReady_ep1()) {
+					if (num_players == 1) {
+						// Single-port adapters have the keyboard in port 1
+						usb_interruptSend_ep1(usbpad_getReportBuffer(&usbpads[0]), usbpad_getReportSizeKB());
+					} else {
+						usb_interruptSend_ep1(usbpad_getReportBuffer(&usbpads[0]), usbpad_getReportSize());
+					}
+				}
+				// Keyboard is always in second port on dual port adapters
+				if (num_players>1 && usb_interruptReady_ep2()) {
+					usb_interruptSend_ep2(usbpad_getReportBuffer(&usbpads[1]), usbpad_getReportSizeKB());
+				}
+				state = STATE_WAIT_POLLTIME;
+				break;
+
+		}
+
+		for (channel=0; channel < num_players; channel++) {
+			gamepad_vibrate = usbpad_mustVibrate(&usbpads[channel]);
+			if (last_v[channel] != gamepad_vibrate) {
+				if (pads[channel] && pads[channel]->setVibration) {
+					pads[channel]->setVibration(channel, gamepad_vibrate);
+				}
+				last_v[channel] = gamepad_vibrate;
+			}
+		}
+	}
+
+	return 0;
+}
+

reportdesc.c

@@ -645,3 +645,21 @@ const uint8_t gcn64_usbHidReportDescriptor[] PROGMEM = {
    0xC0,    //    End Collection
 0xC0,    //    End Collection
 };
+
+static const unsigned char gcKeyboardReport[] PROGMEM = {
+	0x05, 0x01, // Usage page : Generic Desktop
+	0x09, 0x06, // Usage (Keyboard)
+	0xA1, 0x01, // Collection (Application)
+	0x05, 0x07, // Usage Page (Key Codes)
+
+	0x95, 0x03, // Report Count(3)
+	0x75, 0x08, // Report Size(8)
+	0x15, 0x00, // Logical Minimum (0)
+	0x25, 0xE7, // Logical maximum (231)
+
+	0x19, 0x00, // Usage Minimum(0)
+	0x29, 0xE7, // Usage Maximum(231)
+	0x81, 0x00, // Input (Data, Array)
+
+	0xc0,	// END_COLLECTION
+};

requests.h

@@ -29,6 +29,9 @@
 #define CFG_MODE_2P_STANDARD	0x10
 #define CFG_MODE_2P_N64_ONLY	0x11
 #define CFG_MODE_2P_GC_ONLY		0x12
+#define CFG_MODE_KEYBOARD		0x13
+#define CFG_MODE_KB_AND_JS		0x14
+#define CFG_MODE_KEYBOARD_2		0x15
 
 #define CFG_PARAM_SERIAL		0x01
 

usbpad.c

@@ -24,6 +24,8 @@
 #include "mappings.h"
 #include "eeprom.h"
 #include "config.h"
+#include "hid_keycodes.h"
+#include "gc_kb.h"
 
 #define REPORT_ID	1
 
@@ -112,6 +114,18 @@ static void buildIdleReport(unsigned char dstbuf[USBPAD_REPORT_SIZE])
 	dstbuf[14] = 0;
 }
 
+int usbpad_getReportSizeKB(void)
+{
+	return 3;
+}
+
+static void buildIdleReportKB(unsigned char dstbuf[USBPAD_REPORT_SIZE])
+{
+	dstbuf[0] = HID_KB_NOEVENT;
+	dstbuf[1] = HID_KB_NOEVENT;
+	dstbuf[2] = HID_KB_NOEVENT;
+}
+
 static void buildReportFromGC(const gc_pad_data *gc_data, unsigned char dstbuf[USBPAD_REPORT_SIZE])
 {
 	int16_t xval,yval,cxval,cyval,ltrig,rtrig;
@@ -249,6 +263,22 @@ void usbpad_update(struct usbpad *pad, const gamepad_data *pad_data)
 	}
 }
 
+void usbpad_update_kb(struct usbpad *pad, const gamepad_data *pad_data)
+{
+	unsigned char i;
+
+	/* Always start with an idle report. Specific report builders can just
+	 * simply ignore unused parts */
+	buildIdleReportKB(pad->gamepad_report0);
+
+	if (pad_data->pad_type == PAD_TYPE_GC_KB) {
+		for (i=0; i<3; i++) {
+			pad->gamepad_report0[i] = gcKeycodeToHID(pad_data->gckb.keys[i]);
+		}
+	}
+}
+
+
 void usbpad_forceVibrate(struct usbpad *pad, char force)
 {
 	pad->force_vibrate = force;

usbpad.h

@@ -36,4 +36,7 @@ uint16_t usbpad_hid_get_report(struct usbpad *pad, struct usb_request *rq, const
 // For mappings. ID starts at 0.
 #define USB_BTN(id)	(0x0001 << (id))
 
+int usbpad_getReportSizeKB(void);
+void usbpad_update_kb(struct usbpad *pad, const gamepad_data *pad_data);
+
 #endif // USBPAD_H__