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/*
* Copyright (c) 2026, sakumisu
*
* SPDX-License-Identifier: Apache-2.0
*/
#include "usbd_core.h"
#include "usbd_hid.h"
#include "usbd_gamepad.h"
USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t gamepad_report_buffer[64];
static int xinput_vendor_class_request_handler(uint8_t busid, struct usb_setup_packet *setup, uint8_t **data, uint32_t *len)
{
struct xinput_in_report xinput_report;
memset(&xinput_report, 0, sizeof(struct xinput_in_report));
xinput_report.report_size = 20;
memcpy(*data, &xinput_report, sizeof(struct xinput_in_report));
*len = sizeof(struct xinput_in_report);
return 0;
}
// Convert analog value from Joypad (0-255, center 128) to signed 16-bit
static int16_t convert_axis_to_s16(uint8_t value)
{
int32_t scaled = ((int32_t)value - 128) * 256;
if (scaled < -32768) scaled = -32768;
if (scaled > 32767) scaled = 32767;
return (int16_t)scaled;
}
// Convert and invert axis (for Y-axis where convention differs)
static int16_t convert_axis_to_s16_inverted(uint8_t value)
{
int32_t scaled = -((int32_t)value - 128) * 256;
if (scaled < -32768) scaled = -32768;
if (scaled > 32767) scaled = 32767;
return (int16_t)scaled;
}
int usbd_gamepad_xinput_send_report(uint8_t ep, struct usb_gamepad_report *report)
{
struct xinput_in_report *xinput_report;
xinput_report = (struct xinput_in_report *)gamepad_report_buffer;
memset(xinput_report, 0, sizeof(struct xinput_in_report));
xinput_report->report_size = 20;
if (report->buttons & USB_GAMEPAD_BUTTON_DU)
xinput_report->buttons |= XINPUT_BUTTON_MASK_UP;
if (report->buttons & USB_GAMEPAD_BUTTON_DD)
xinput_report->buttons |= XINPUT_BUTTON_MASK_DOWN;
if (report->buttons & USB_GAMEPAD_BUTTON_DL)
xinput_report->buttons |= XINPUT_BUTTON_MASK_LEFT;
if (report->buttons & USB_GAMEPAD_BUTTON_DR)
xinput_report->buttons |= XINPUT_BUTTON_MASK_RIGHT;
if (report->buttons & USB_GAMEPAD_BUTTON_S2)
xinput_report->buttons |= XINPUT_BUTTON_MASK_START;
if (report->buttons & USB_GAMEPAD_BUTTON_S1)
xinput_report->buttons |= XINPUT_BUTTON_MASK_BACK;
if (report->buttons & USB_GAMEPAD_BUTTON_L3)
xinput_report->buttons |= XINPUT_BUTTON_MASK_L3;
if (report->buttons & USB_GAMEPAD_BUTTON_R3)
xinput_report->buttons |= XINPUT_BUTTON_MASK_R3;
if (report->buttons & USB_GAMEPAD_BUTTON_L1)
xinput_report->buttons |= XINPUT_BUTTON_MASK_LB;
if (report->buttons & USB_GAMEPAD_BUTTON_R1)
xinput_report->buttons |= XINPUT_BUTTON_MASK_RB;
if (report->buttons & USB_GAMEPAD_BUTTON_A1)
xinput_report->buttons |= XINPUT_BUTTON_MASK_GUIDE;
if (report->buttons & USB_GAMEPAD_BUTTON_B1)
xinput_report->buttons |= XINPUT_BUTTON_MASK_A;
if (report->buttons & USB_GAMEPAD_BUTTON_B2)
xinput_report->buttons |= XINPUT_BUTTON_MASK_B;
if (report->buttons & USB_GAMEPAD_BUTTON_B3)
xinput_report->buttons |= XINPUT_BUTTON_MASK_X;
if (report->buttons & USB_GAMEPAD_BUTTON_B4)
xinput_report->buttons |= XINPUT_BUTTON_MASK_Y;
// Analog triggers (0-255), fall back to digital if analog is 0 but button pressed
xinput_report->lt = report->lt;
xinput_report->rt = report->rt;
if (xinput_report->lt == 0 && (report->buttons & USB_GAMEPAD_BUTTON_L2))
xinput_report->lt = 0xFF;
if (xinput_report->rt == 0 && (report->buttons & USB_GAMEPAD_BUTTON_R2))
xinput_report->rt = 0xFF;
// Analog sticks (signed 16-bit, -32768 to +32767)
// Y-axis inverted: input 0=down, XInput convention positive=up
xinput_report->lx = convert_axis_to_s16(report->lx);
xinput_report->ly = convert_axis_to_s16_inverted(report->ly);
xinput_report->rx = convert_axis_to_s16(report->rx);
xinput_report->ry = convert_axis_to_s16_inverted(report->ry);
return usbd_ep_start_write(0, ep, gamepad_report_buffer, sizeof(struct xinput_in_report));
}
// Convert gamepad dpad mask to switch hat value
static uint8_t convert_dpad_to_switch_hat(uint32_t buttons)
{
// Joypad uses active-high (1 = pressed)
uint8_t up = (buttons & USB_GAMEPAD_BUTTON_DU) ? 1 : 0;
uint8_t down = (buttons & USB_GAMEPAD_BUTTON_DD) ? 1 : 0;
uint8_t left = (buttons & USB_GAMEPAD_BUTTON_DL) ? 1 : 0;
uint8_t right = (buttons & USB_GAMEPAD_BUTTON_DR) ? 1 : 0;
if (up && right)
return SWITCH_HAT_UP_RIGHT;
if (up && left)
return SWITCH_HAT_UP_LEFT;
if (down && right)
return SWITCH_HAT_DOWN_RIGHT;
if (down && left)
return SWITCH_HAT_DOWN_LEFT;
if (up)
return SWITCH_HAT_UP;
if (down)
return SWITCH_HAT_DOWN;
if (left)
return SWITCH_HAT_LEFT;
if (right)
return SWITCH_HAT_RIGHT;
return SWITCH_HAT_CENTER;
}
int usbd_gamepad_switch_send_report(uint8_t ep, struct usb_gamepad_report *report)
{
struct switch_in_report *switch_report;
switch_report = (struct switch_in_report *)gamepad_report_buffer;
memset(switch_report, 0, sizeof(struct switch_in_report));
if (report->buttons & USB_GAMEPAD_BUTTON_S1)
switch_report->buttons |= SWITCH_MASK_MINUS;
if (report->buttons & USB_GAMEPAD_BUTTON_S2)
switch_report->buttons |= SWITCH_MASK_PLUS;
if (report->buttons & USB_GAMEPAD_BUTTON_L1)
switch_report->buttons |= SWITCH_MASK_L;
if (report->buttons & USB_GAMEPAD_BUTTON_R1)
switch_report->buttons |= SWITCH_MASK_R;
if (report->buttons & USB_GAMEPAD_BUTTON_L2)
switch_report->buttons |= SWITCH_MASK_ZL;
if (report->buttons & USB_GAMEPAD_BUTTON_R2)
switch_report->buttons |= SWITCH_MASK_ZR;
if (report->buttons & USB_GAMEPAD_BUTTON_L3)
switch_report->buttons |= SWITCH_MASK_L3;
if (report->buttons & USB_GAMEPAD_BUTTON_R3)
switch_report->buttons |= SWITCH_MASK_R3;
if (report->buttons & USB_GAMEPAD_BUTTON_A1)
switch_report->buttons |= SWITCH_MASK_HOME;
if (report->buttons & USB_GAMEPAD_BUTTON_A2)
switch_report->buttons |= SWITCH_MASK_CAPTURE;
if (report->buttons & USB_GAMEPAD_BUTTON_B1)
switch_report->buttons |= SWITCH_MASK_B;
if (report->buttons & USB_GAMEPAD_BUTTON_B2)
switch_report->buttons |= SWITCH_MASK_A;
if (report->buttons & USB_GAMEPAD_BUTTON_B3)
switch_report->buttons |= SWITCH_MASK_Y;
if (report->buttons & USB_GAMEPAD_BUTTON_B4)
switch_report->buttons |= SWITCH_MASK_X;
switch_report->hat = convert_dpad_to_switch_hat(report->buttons);
// Analog sticks (HID convention: 0=up, 255=down - no inversion needed)
switch_report->lx = report->lx;
switch_report->ly = report->ly;
switch_report->rx = report->rx;
switch_report->ry = report->ry;
switch_report->vendor = 0;
return usbd_ep_start_write(0, ep, gamepad_report_buffer, sizeof(struct switch_in_report));
}
struct usbd_interface *usbd_gamepad_xinput_init_intf(struct usbd_interface *intf)
{
intf->class_interface_handler = NULL;
intf->class_endpoint_handler = NULL;
intf->vendor_handler = xinput_vendor_class_request_handler;
intf->notify_handler = NULL;
return intf;
}
static const uint8_t hid_switch_report_desc[HID_SWITCH_REPORT_DESC_SIZE] = {
0x05, 0x01, // Usage Page (Generic Desktop Ctrls)
0x09, 0x05, // Usage (Game Pad)
0xA1, 0x01, // Collection (Application)
0x15, 0x00, // Logical Minimum (0)
0x25, 0x01, // Logical Maximum (1)
0x35, 0x00, // Physical Minimum (0)
0x45, 0x01, // Physical Maximum (1)
0x75, 0x01, // Report Size (1)
0x95, 0x10, // Report Count (16)
0x05, 0x09, // Usage Page (Button)
0x19, 0x01, // Usage Minimum (Button 1)
0x29, 0x10, // Usage Maximum (Button 16)
0x81, 0x02, // Input (Data,Var,Abs)
0x05, 0x01, // Usage Page (Generic Desktop Ctrls)
0x25, 0x07, // Logical Maximum (7)
0x46, 0x3B, 0x01, // Physical Maximum (315)
0x75, 0x04, // Report Size (4)
0x95, 0x01, // Report Count (1)
0x65, 0x14, // Unit (Eng Rot:Angular Pos)
0x09, 0x39, // Usage (Hat switch)
0x81, 0x42, // Input (Data,Var,Abs,Null)
0x65, 0x00, // Unit (None)
0x95, 0x01, // Report Count (1)
0x81, 0x01, // Input (Const) - 4-bit padding
0x26, 0xFF, 0x00, // Logical Maximum (255)
0x46, 0xFF, 0x00, // Physical Maximum (255)
0x09, 0x30, // Usage (X) - Left Stick X
0x09, 0x31, // Usage (Y) - Left Stick Y
0x09, 0x32, // Usage (Z) - Right Stick X
0x09, 0x35, // Usage (Rz) - Right Stick Y
0x75, 0x08, // Report Size (8)
0x95, 0x04, // Report Count (4)
0x81, 0x02, // Input (Data,Var,Abs)
0x06, 0x00, 0xFF, // Usage Page (Vendor Defined)
0x09, 0x20, // Usage (0x20)
0x95, 0x01, // Report Count (1)
0x81, 0x02, // Input (Data,Var,Abs) - Vendor byte
0x0A, 0x21, 0x26, // Usage (0x2621)
0x95, 0x08, // Report Count (8)
0x91, 0x02, // Output (Data,Var,Abs) - Rumble
0xC0, // End Collection
};
struct usbd_interface *usbd_gamepad_switch_init_intf(struct usbd_interface *intf)
{
return usbd_hid_init_intf(0, intf, hid_switch_report_desc, HID_SWITCH_REPORT_DESC_SIZE);
}
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