From 84a05be9dbc9d1b181670f8fd7e036bbe691d856 Mon Sep 17 00:00:00 2001
From: Simon Howard
Date: Tue, 10 Mar 2009 21:55:55 +0000
Subject: Add OPL lib plumbing and Linux native driver.

Subversion-branch: /branches/opl-branch
Subversion-revision: 1458
---
 opl/opl.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 50 insertions(+), 6 deletions(-)

(limited to 'opl/opl.c')

diff --git a/opl/opl.c b/opl/opl.c
index d3dfc23b..28609223 100644
--- a/opl/opl.c
+++ b/opl/opl.c
@@ -23,27 +23,71 @@
 //
 //-----------------------------------------------------------------------------
 
+#include "config.h"
+
+#include <stdlib.h>
+
 #include "opl.h"
+#include "opl_internal.h"
+
+#ifdef HAVE_IOPERM
+extern opl_driver_t opl_linux_driver;
+#endif
+
+static opl_driver_t *drivers[] =
+{
+#ifdef HAVE_IOPERM
+    &opl_linux_driver,
+#endif
+    NULL
+};
+
+static opl_driver_t *driver = NULL;
 
 int OPL_Init(unsigned int port_base)
 {
-    // TODO
-    return 1;
+    int i;
+
+    // Try drivers until we find a working one:
+
+    for (i=0; drivers[i] != NULL; ++i)
+    {
+        if (drivers[i]->init_func(port_base))
+        {
+            driver = drivers[i];
+            return 1;
+        }
+    }
+
+    return 0;
 }
 
 void OPL_Shutdown(void)
 {
-    // TODO
+    if (driver != NULL)
+    {
+        driver->shutdown_func();
+        driver = NULL;
+    }
 }
 
 void OPL_WritePort(opl_port_t port, unsigned int value)
 {
-    // TODO
+    if (driver != NULL)
+    {
+        driver->write_port_func(port, value);
+    }
 }
 
 unsigned int OPL_ReadPort(opl_port_t port)
 {
-    // TODO
-    return 0;
+    if (driver != NULL)
+    {
+        return driver->read_port_func(port);
+    }
+    else
+    {
+        return 0;
+    }
 }
 
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