1 files changed, 110 insertions, 0 deletions
diff --git a/opl/opl_linux.c b/opl/opl_linux.c
new file mode 100644
index 00000000..319686b8
--- /dev/null
+++ b/opl/opl_linux.c
@@ -0,0 +1,110 @@
+// Emacs style mode select   -*- C++ -*- 
+//-----------------------------------------------------------------------------
+//
+// Copyright(C) 2009 Simon Howard
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License
+// as published by the Free Software Foundation; either version 2
+// of the License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+// 02111-1307, USA.
+//
+// DESCRIPTION:
+//     OPL Linux interface.
+//
+//-----------------------------------------------------------------------------
+
+#include "config.h"
+
+#ifdef HAVE_IOPERM
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/io.h>
+
+#include "opl.h"
+#include "opl_internal.h"
+#include "opl_timer.h"
+
+static unsigned int opl_port_base;
+
+static int OPL_Linux_Init(unsigned int port_base)
+{
+    // Try to get permissions:
+
+    if (ioperm(port_base, 2, 1) < 0)
+    {
+        fprintf(stderr, "Failed to get I/O port permissions for 0x%x: %s\n",
+                        port_base, strerror(errno));
+
+        if (errno == EPERM)
+        {
+            fprintf(stderr,
+                    "\tYou may need to run the program as root in order\n"
+                    "\tto acquire I/O port permissions for OPL MIDI playback.\n");
+        }
+
+        return 0;
+    }
+
+    opl_port_base = port_base;
+
+    // Start callback thread
+
+    if (!OPL_Timer_StartThread())
+    {
+        ioperm(port_base, 2, 0);
+        return 0;
+    }
+
+    return 1;
+}
+
+static void OPL_Linux_Shutdown(void)
+{
+    // Stop callback thread
+
+    OPL_Timer_StopThread();
+
+    // Release permissions
+
+    ioperm(opl_port_base, 2, 0);
+}
+
+static unsigned int OPL_Linux_PortRead(opl_port_t port)
+{
+    return inb(opl_port_base + port);
+}
+
+static void OPL_Linux_PortWrite(opl_port_t port, unsigned int value)
+{
+    outb(value, opl_port_base + port);
+}
+
+opl_driver_t opl_linux_driver =
+{
+    "Linux",
+    OPL_Linux_Init,
+    OPL_Linux_Shutdown,
+    OPL_Linux_PortRead,
+    OPL_Linux_PortWrite,
+    OPL_Timer_SetCallback,
+    OPL_Timer_ClearCallbacks,
+    OPL_Timer_Lock,
+    OPL_Timer_Unlock,
+    OPL_Timer_SetPaused
+};
+
+#endif /* #ifdef HAVE_IOPERM */
+