mai2io: add camera LED control functions (#91)

This is a follow-up to the previous PR. I realized I omitted the camera LED control interface, so I'm adding it now to complete the v1.02 API set.

**Changes:**
* Added `mai2_io_led_cam_set` to the 0x0102 API.
* Wired IO4 GPIO outputs to forward code reader/player camera light states.
* Updated `mai2hook.def` to export the new symbol.
* Updated `MAI2_DLL_SYM_COUNT_V102` to reflect the additional symbol count.

**Versioning Note:**
Since the previous PR was just merged and v1.02 hasn't been officially released yet, I've opted to include this in the existing **0x0102** version rather than bumping to 0x0103.

Reviewed-on: https://gitea.tendokyu.moe/TeamTofuShop/segatools/pulls/91
Co-authored-by: グローランプ <130208311+Gl0w1amp@users.noreply.github.com>
Co-committed-by: グローランプ <130208311+Gl0w1amp@users.noreply.github.com>

games/mai2hook/io4.c

@@ -177,6 +177,28 @@ static HRESULT mai2_io4_write_gpio(uint8_t* payload, size_t len) {
         dprintf("  Camera Ring:    %s\n", (payload[1] & 0x80) ? "ON" : "OFF");
         dprintf("  Camera Rec:     %s\n", (payload[1] & 0x40) ? "ON" : "OFF");
 #endif
+
+        if (mai2_dll.led_cam_set != NULL) {
+            uint8_t state = 0;
+
+            if (payload[0] & 0x20) {
+                state |= MAI2_IO_LED_CAM_CODE_READER_1P;
+            }
+
+            if (payload[0] & 0x04) {
+                state |= MAI2_IO_LED_CAM_CODE_READER_2P;
+            }
+
+            if (payload[1] & 0x80) {
+                state |= MAI2_IO_LED_CAM_RING;
+            }
+
+            if (payload[1] & 0x40) {
+                state |= MAI2_IO_LED_CAM_REC;
+            }
+
+            mai2_dll.led_cam_set(state);
+        }
     }
     return S_OK;
 }
@@ -212,4 +234,4 @@ static HRESULT mai2_io4_write_unique(uint8_t* payload, size_t len) {
     }
 
     return S_OK;
-}
+}

games/mai2hook/mai2-dll.c

@@ -10,7 +10,7 @@
 
 enum {
     MAI2_DLL_SYM_COUNT_V101 = 11,
-    MAI2_DLL_SYM_COUNT_V102 = 12,
+    MAI2_DLL_SYM_COUNT_V102 = 13,
 };
 
 const struct dll_bind_sym mai2_dll_syms[] = {
@@ -50,6 +50,9 @@ const struct dll_bind_sym mai2_dll_syms[] = {
     }, {
         .sym = "mai2_io_led_billboard_set",
         .off = offsetof(struct mai2_dll, led_set_leds),
+    }, {
+        .sym = "mai2_io_led_cam_set",
+        .off = offsetof(struct mai2_dll, led_cam_set),
     },
 };
 

games/mai2hook/mai2-dll.h

@@ -18,6 +18,7 @@ struct mai2_dll {
     void (*led_dc_update)(uint8_t board, const uint8_t *rgb);
     void (*led_gs_update)(uint8_t board, const uint8_t *rgb);
     void (*led_set_leds)(uint8_t board, const uint8_t *rgb);
+    void (*led_cam_set)(uint8_t state);
 };
 
 struct mai2_dll_config {

games/mai2hook/mai2hook.def

@@ -24,3 +24,4 @@ EXPORTS
     mai2_io_led_dc_update
     mai2_io_led_gs_update
     mai2_io_led_billboard_set
+    mai2_io_led_cam_set

games/mai2io/mai2io.c

@@ -273,3 +273,14 @@ void mai2_io_led_billboard_set(uint8_t board, const uint8_t *rgb) {
 #endif
     return;
 }
+
+void mai2_io_led_cam_set(uint8_t state) {
+#if 0
+    dprintf("Mai2 LED cam: CodeReader1P=%s CodeReader2P=%s Ring=%s Rec=%s\n",
+            (state & MAI2_IO_LED_CAM_CODE_READER_1P) ? "ON" : "OFF",
+            (state & MAI2_IO_LED_CAM_CODE_READER_2P) ? "ON" : "OFF",
+            (state & MAI2_IO_LED_CAM_RING) ? "ON" : "OFF",
+            (state & MAI2_IO_LED_CAM_REC) ? "ON" : "OFF");
+#endif
+    return;
+}

games/mai2io/mai2io.h

@@ -199,3 +199,17 @@ void mai2_io_led_gs_update(uint8_t board, const uint8_t *rgb);
    Minimum API version: 0x0102 */
 
 void mai2_io_led_billboard_set(uint8_t board, const uint8_t *rgb);
+
+enum {
+    MAI2_IO_LED_CAM_CODE_READER_1P = 0x01,
+    MAI2_IO_LED_CAM_CODE_READER_2P = 0x02,
+    MAI2_IO_LED_CAM_RING = 0x04,
+    MAI2_IO_LED_CAM_REC = 0x08,
+};
+
+/* Update the Code Reader and Player Camera lights. State is a bitmask of
+   MAI2_IO_LED_CAM_* values.
+
+   Minimum API version: 0x0102 */
+
+void mai2_io_led_cam_set(uint8_t state);