[PATCH] i2c: add i2c_adapter class support

drivers/i2c/i2c-core.c

@@ -62,6 +62,10 @@ static struct device_driver i2c_generic_driver = {
 	.remove = i2c_device_remove,
 };
 
+static struct class i2c_adapter_class = {
+	.name =		"i2c-adapter"
+};
+
 
 /* ---------------------------------------------------
  * registering functions 
@@ -97,6 +101,13 @@ int i2c_add_adapter(struct i2c_adapter *adap)
 	adap->dev.driver = &i2c_generic_driver;
 	device_register(&adap->dev);
 
+	/* Add this adapter to the i2c_adapter class */
+	memset(&adap->class_dev, 0x00, sizeof(struct class_device));
+	adap->class_dev.dev = &adap->dev;
+	adap->class_dev.class = &i2c_adapter_class;
+	strncpy(adap->class_dev.class_id, adap->dev.bus_id, BUS_ID_SIZE);
+	class_device_register(&adap->class_dev);
+
 	/* inform drivers of new adapters */
 	list_for_each(item,&drivers) {
 		driver = list_entry(item, struct i2c_driver, list);
@@ -150,6 +161,7 @@ int i2c_del_adapter(struct i2c_adapter *adap)
 	}
 
 	/* clean up the sysfs representation */
+	class_device_unregister(&adap->class_dev);
 	device_unregister(&adap->dev);
 	list_del(&adap->list);
 
@@ -443,14 +455,19 @@ struct bus_type i2c_bus_type = {
 	.match =	i2c_device_match,
 };
 
-
 static int __init i2c_init(void)
 {
-	return bus_register(&i2c_bus_type);
+	int retval;
+
+	retval = bus_register(&i2c_bus_type);
+	if (retval)
+		return retval;
+	return class_register(&i2c_adapter_class);
 }
 
 static void __exit i2c_exit(void)
 {
+	class_unregister(&i2c_adapter_class);
 	bus_unregister(&i2c_bus_type);
 }
 
@@ -475,7 +492,7 @@ int i2c_transfer(struct i2c_adapter * adap, struct i2c_msg msgs[],int num)
 
 		return ret;
 	} else {
-		dev_err(&adap->dev, "I2C level transfers not supported\n");
+		DEB2(dev_dbg(&adap->dev, "I2C level transfers not supported\n"));
 		return -ENOSYS;
 	}
 }

include/linux/i2c.h

@@ -240,7 +240,8 @@ struct i2c_adapter {
 
 	int timeout;
 	int retries;
-	struct device dev;	/* the adapter device */
+	struct device dev;		/* the adapter device */
+	struct class_device class_dev;	/* the class device */
 
 #ifdef CONFIG_PROC_FS 
 	/* No need to set this when you initialize the adapter          */