chusan: added chusanhook, led board fix, config added

credits go to @domeori https://dev.s-ul.net/domeori/segatools/-/tree/mr-imports

chusanhook/io4.c

@@ -0,0 +1,107 @@
+#include <windows.h>
+
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "board/io4.h"
+
+#include "chusanhook/chuni-dll.h"
+#include "util/dprintf.h"
+
+struct chunithm_jvs_ir_mask {
+    uint16_t p1;
+    uint16_t p2;
+};
+
+// Incorrect IR beam mappings retained for backward compatibility
+static const struct chunithm_jvs_ir_mask chunithm_jvs_ir_masks_v1[] = {
+    { 0, 1 << 13 },
+    { 1 << 13, 0 },
+    { 0, 1 << 12 },
+    { 1 << 12, 0 },
+    { 0, 1 << 11 },
+    { 1 << 11, 0 },
+};
+
+static const struct chunithm_jvs_ir_mask chunithm_jvs_ir_masks[] = {
+    { 1 << 13, 0 },
+    { 0, 1 << 13 },
+    { 1 << 12, 0 },
+    { 0, 1 << 12 },
+    { 1 << 11, 0 },
+    { 0, 1 << 11 },
+};
+
+static HRESULT chusan_io4_poll(void* ctx, struct io4_state* state);
+static uint16_t coins;
+
+static const struct io4_ops chusan_io4_ops = {
+    .poll = chusan_io4_poll,
+};
+
+HRESULT chusan_io4_hook_init(const struct io4_config* cfg)
+{
+    HRESULT hr;
+
+    assert(chuni_dll.jvs_init != NULL);
+
+    dprintf("USB I/O: Starting IO backend\n");
+    hr = chuni_dll.jvs_init();
+
+    if (FAILED(hr)) {
+        dprintf("USB I/O: Backend error, I/O disconnected: %x\n", (int)hr);
+
+        return hr;
+    }
+
+    io4_hook_init(cfg, &chusan_io4_ops, NULL);
+
+    return S_OK;
+}
+
+static HRESULT chusan_io4_poll(void* ctx, struct io4_state* state)
+{
+    const struct chunithm_jvs_ir_mask *masks;
+    uint8_t opbtn;
+    uint8_t beams;
+    size_t i;
+
+    memset(state, 0, sizeof(*state));
+
+    opbtn = 0;
+    beams = 0;
+
+    chuni_dll.jvs_poll(&opbtn, &beams);
+
+    if (chuni_dll.api_version >= 0x0101) {
+        // Use correct mapping
+        masks = chunithm_jvs_ir_masks;
+    } else {
+        // Use backwards-compatible incorrect mapping
+        masks = chunithm_jvs_ir_masks_v1;
+    }
+
+    if (opbtn & CHUNI_IO_OPBTN_TEST) {
+        state->buttons[0] |= IO4_BUTTON_TEST;
+    }
+
+    if (opbtn & CHUNI_IO_OPBTN_SERVICE) {
+        state->buttons[0] |= IO4_BUTTON_SERVICE;
+    }
+
+    if (opbtn & CHUNI_IO_OPBTN_COIN) {
+        coins++;
+    }
+    state->chutes[0] = coins << 8;
+
+    for (i = 0; i < 6; i++) {
+        /* Beam "press" is active-low hence the ~ */
+        if (~beams & (1 << i)) {
+            state->buttons[0] |= masks[i].p1;
+            state->buttons[1] |= masks[i].p2;
+        }
+    }
+
+    return S_OK;
+}