1 files changed, 72 insertions, 0 deletions

diff --git a/sound/ac97_bus.c b/sound/ac97_bus.c
new file mode 100644
index 000000000000..66de2c2f1554
--- /dev/null
+++ b/sound/ac97_bus.c
@@ -0,0 +1,72 @@
+/*
+ * Linux driver model AC97 bus interface
+ *
+ * Author:      Nicolas Pitre
+ * Created:     Jan 14, 2005
+ * Copyright:   (C) MontaVista Software Inc.
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/string.h>
+
+/*
+ * Let drivers decide whether they want to support given codec from their
+ * probe method.  Drivers have direct access to the struct snd_ac97 structure and may
+ * decide based on the id field amongst other things.
+ */
+static int ac97_bus_match(struct device *dev, struct device_driver *drv)
+{
+        return 1;
+}
+
+static int ac97_bus_suspend(struct device *dev, pm_message_t state)
+{
+        int ret = 0;
+
+        if (dev->driver && dev->driver->suspend)
+                ret = dev->driver->suspend(dev, state);
+
+        return ret;
+}
+
+static int ac97_bus_resume(struct device *dev)
+{
+        int ret = 0;
+
+        if (dev->driver && dev->driver->resume)
+                ret = dev->driver->resume(dev);
+
+        return ret;
+}
+
+struct bus_type ac97_bus_type = {
+        .name           = "ac97",
+        .match          = ac97_bus_match,
+        .suspend        = ac97_bus_suspend,
+        .resume         = ac97_bus_resume,
+};
+
+static int __init ac97_bus_init(void)
+{
+        return bus_register(&ac97_bus_type);
+}
+
+subsys_initcall(ac97_bus_init);
+
+static void __exit ac97_bus_exit(void)
+{
+        bus_unregister(&ac97_bus_type);
+}
+
+module_exit(ac97_bus_exit);
+
+EXPORT_SYMBOL(ac97_bus_type);
+
+MODULE_LICENSE("GPL");