3 files changed, 116 insertions, 0 deletions

diff --git a/sound/pci/ac97/Makefile b/sound/pci/ac97/Makefile
index 3c32221..77b3482 100644
--- a/sound/pci/ac97/Makefile
+++ b/sound/pci/ac97/Makefile
@@ -10,9 +10,11 @@ snd-ac97-codec-objs += ac97_proc.o
 endif
 
 snd-ak4531-codec-objs := ak4531_codec.o
+snd-ac97-bus-objs := ac97_bus.o
 
 # Toplevel Module Dependency
 obj-$(CONFIG_SND_AC97_CODEC) += snd-ac97-codec.o
 obj-$(CONFIG_SND_ENS1370) += snd-ak4531-codec.o
+obj-$(CONFIG_SND_AC97_BUS) += snd-ac97-bus.o
 
 obj-m := $(sort $(obj-m))
diff --git a/sound/pci/ac97/ac97_bus.c b/sound/pci/ac97/ac97_bus.c
new file mode 100644
index 0000000..227f8b9
--- /dev/null
+++ b/sound/pci/ac97/ac97_bus.c
@@ -0,0 +1,79 @@
+/*
+ * 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>
+
+/*
+ * Codec families have names seperated by commas, so we search for an
+ * individual codec name within the family string. 
+ */
+static int ac97_bus_match(struct device *dev, struct device_driver *drv)
+{
+	return (strstr(dev->bus_id, drv->name) != NULL);
+}
+
+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, SUSPEND_DISABLE);
+		if (ret == 0)
+			ret = dev->driver->suspend(dev, state, SUSPEND_SAVE_STATE);
+		if (ret == 0)
+			ret = dev->driver->suspend(dev, state, SUSPEND_POWER_DOWN);
+	}
+	return ret;
+}
+
+static int ac97_bus_resume(struct device *dev)
+{
+	int ret = 0;
+
+	if (dev->driver && dev->driver->resume) {
+		ret = dev->driver->resume(dev, RESUME_POWER_ON);
+		if (ret == 0)
+			ret = dev->driver->resume(dev, RESUME_RESTORE_STATE);
+		if (ret == 0)
+			ret = dev->driver->resume(dev, RESUME_ENABLE);
+	}
+	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");
diff --git a/sound/pci/ac97/ac97_codec.c b/sound/pci/ac97/ac97_codec.c
index cbf7902..33dba10 100644
--- a/sound/pci/ac97/ac97_codec.c
+++ b/sound/pci/ac97/ac97_codec.c
@@ -1813,6 +1813,39 @@ int snd_ac97_bus(snd_card_t *card, int num, ac97_bus_ops_t *ops,
 	return 0;
 }
 
+/* stop no dev release warning */
+static void ac97_device_release(struct device * dev)
+{
+}
+
+/* register ac97 codec to bus */
+static int snd_ac97_dev_register(snd_device_t *device)
+{
+	ac97_t *ac97 = device->device_data;
+	int err;
+
+	ac97->dev.bus = &ac97_bus_type;
+	ac97->dev.parent = ac97->bus->card->dev;
+	ac97->dev.platform_data = ac97;
+	ac97->dev.release = ac97_device_release;
+	strncpy(ac97->dev.bus_id, snd_ac97_get_short_name(ac97), BUS_ID_SIZE);
+	if ((err = device_register(&ac97->dev)) < 0) {
+		snd_printk(KERN_ERR "Can't register ac97 bus\n");
+		ac97->dev.bus = NULL;
+		return err;
+	}
+	return 0;
+}
+
+/* unregister ac97 codec */
+static int snd_ac97_dev_unregister(snd_device_t *device)
+{
+	ac97_t *ac97 = device->device_data;
+	if (ac97->dev.bus)
+		device_unregister(&ac97->dev);
+	return snd_ac97_free(ac97);
+}
+
 /* build_ops to do nothing */
 static struct snd_ac97_build_ops null_build_ops;
 
@@ -1846,6 +1879,8 @@ int snd_ac97_mixer(ac97_bus_t *bus, ac97_template_t *template, ac97_t **rac97)
 	const ac97_codec_id_t *pid;
 	static snd_device_ops_t ops = {
 		.dev_free =	snd_ac97_dev_free,
+		.dev_register =	snd_ac97_dev_register,
+		.dev_unregister =	snd_ac97_dev_unregister,
 	};
 
 	snd_assert(rac97 != NULL, return -EINVAL);