Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / sound / ac97_bus.c

diff --git a/kernel/sound/ac97_bus.c b/kernel/sound/ac97_bus.c
new file mode 100644 (file)
index 0000000..2b50cbe
--- /dev/null
+++ b/kernel/sound/ac97_bus.c
@@ -0,0 +1,77 @@
+/*
+ * 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>
+#include <sound/ac97_codec.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;
+}
+
+#ifdef CONFIG_PM
+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;
+}
+#endif /* CONFIG_PM */
+
+struct bus_type ac97_bus_type = {
+       .name           = "ac97",
+       .match          = ac97_bus_match,
+#ifdef CONFIG_PM
+       .suspend        = ac97_bus_suspend,
+       .resume         = ac97_bus_resume,
+#endif /* CONFIG_PM */
+};
+
+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");