board/io4.c: add configuration section to enable/disable emulation

board/config.c

@@ -31,3 +31,11 @@ void aime_config_load(struct aime_config *cfg, const wchar_t *filename)
     aime_dll_config_load(&cfg->dll, filename);
     cfg->enable = GetPrivateProfileIntW(L"aime", L"enable", 1, filename);
 }
+
+void io4_config_load(struct io4_config *cfg, const wchar_t *filename)
+{
+    assert(cfg != NULL);
+    assert(filename != NULL);
+
+    cfg->enable = GetPrivateProfileIntW(L"io4", L"enable", 1, filename);
+}

board/config.h

@@ -3,6 +3,8 @@
 #include <stdbool.h>
 #include <stddef.h>
 
+#include "board/io4.h"
 #include "board/sg-reader.h"
 
 void aime_config_load(struct aime_config *cfg, const wchar_t *filename);
+void io4_config_load(struct io4_config *cfg, const wchar_t *filename);

board/io4.c

@@ -8,6 +8,7 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include "board/config.h"
 #include "board/guid.h"
 #include "board/io4.h"
 
@@ -97,12 +98,20 @@ static uint8_t io4_system_status;
 static const struct io4_ops *io4_ops;
 static void *io4_ops_ctx;
 
-HRESULT io4_hook_init(const struct io4_ops *ops, void *ctx)
+HRESULT io4_hook_init(
+        const struct io4_config *cfg,
+        const struct io4_ops *ops,
+        void *ctx)
 {
     HRESULT hr;
 
+    assert(cfg != NULL);
     assert(ops != NULL);
 
+    if (!cfg->enable) {
+        return S_FALSE;
+    }
+
     async_init(&io4_async, NULL);
 
     hr = iohook_open_nul_fd(&io4_fd);

board/io4.h

@@ -11,6 +11,10 @@ enum {
     IO4_BUTTON_SERVICE  = 1 << 6,
 };
 
+struct io4_config {
+    bool enable;
+};
+
 struct io4_state {
     uint16_t adcs[8];
     uint16_t spinners[4];
@@ -22,4 +26,7 @@ struct io4_ops {
     HRESULT (*poll)(void *ctx, struct io4_state *state);
 };
 
-HRESULT io4_hook_init(const struct io4_ops *ops, void *ctx);
+HRESULT io4_hook_init(
+        const struct io4_config *cfg,
+        const struct io4_ops *ops,
+        void *ctx);