i2c: Class attribute cleanup

This patch is a minor cleanup/code shrink, using class infrastructure
in i2c-core to manage the i2c_adapter attribute.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/i2c/busses/i2c-isa.c

@@ -64,16 +64,6 @@ static u32 isa_func(struct i2c_adapter *adapter)
 }
 
 
-/* Copied from i2c-core */
-static ssize_t show_adapter_name(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	struct i2c_adapter *adap = dev_to_i2c_adapter(dev);
-	return sprintf(buf, "%s\n", adap->name);
-}
-static DEVICE_ATTR(name, S_IRUGO, show_adapter_name, NULL);
-
-
 /* We implement an interface which resembles i2c_{add,del}_driver,
    but for i2c-isa drivers. We don't have to remember and handle lists
    of drivers and adapters so this is much more simple, of course. */
@@ -146,20 +136,11 @@ static int __init i2c_isa_init(void)
 		printk(KERN_ERR "i2c-isa: Failed to register device\n");
 		goto exit;
 	}
-	err = device_create_file(&isa_adapter.dev, &dev_attr_name);
-	if (err) {
-		printk(KERN_ERR "i2c-isa: Failed to create name file\n");
-		goto exit_unregister;
-	}
 
 	dev_dbg(&isa_adapter.dev, "%s registered\n", isa_adapter.name);
 
 	return 0;
 
-exit_unregister:
-	init_completion(&isa_adapter.dev_released); /* Needed? */
-	device_unregister(&isa_adapter.dev);
-	wait_for_completion(&isa_adapter.dev_released);
 exit:
 	return err;
 }
@@ -187,7 +168,6 @@ static void __exit i2c_isa_exit(void)
 	/* Clean up the sysfs representation */
 	dev_dbg(&isa_adapter.dev, "Unregistering from sysfs\n");
 	init_completion(&isa_adapter.dev_released);
-	device_remove_file(&isa_adapter.dev, &dev_attr_name);
 	device_unregister(&isa_adapter.dev);
 
 	/* Wait for sysfs to drop all references */

drivers/i2c/i2c-core.c

@@ -107,28 +107,32 @@ struct bus_type i2c_bus_type = {
 
 /* ------------------------------------------------------------------------- */
 
+/* I2C bus adapters -- one roots each I2C or SMBUS segment */
+
 void i2c_adapter_dev_release(struct device *dev)
 {
 	struct i2c_adapter *adap = dev_to_i2c_adapter(dev);
 	complete(&adap->dev_released);
 }
 
-/* ------------------------------------------------------------------------- */
+static ssize_t
+show_adapter_name(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct i2c_adapter *adap = dev_to_i2c_adapter(dev);
+	return sprintf(buf, "%s\n", adap->name);
+}
 
-/* I2C bus adapters -- one roots each I2C or SMBUS segment */
+static struct device_attribute i2c_adapter_attrs[] = {
+	__ATTR(name, S_IRUGO, show_adapter_name, NULL),
+	{ },
+};
 
 struct class i2c_adapter_class = {
 	.owner			= THIS_MODULE,
 	.name			= "i2c-adapter",
+	.dev_attrs		= i2c_adapter_attrs,
 };
 
-static ssize_t show_adapter_name(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	struct i2c_adapter *adap = dev_to_i2c_adapter(dev);
-	return sprintf(buf, "%s\n", adap->name);
-}
-static DEVICE_ATTR(name, S_IRUGO, show_adapter_name, NULL);
-
 
 static void i2c_client_release(struct device *dev)
 {
@@ -201,9 +205,6 @@ int i2c_add_adapter(struct i2c_adapter *adap)
 	res = device_register(&adap->dev);
 	if (res)
 		goto out_list;
-	res = device_create_file(&adap->dev, &dev_attr_name);
-	if (res)
-		goto out_unregister;
 
 	dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name);
 
@@ -219,10 +220,6 @@ out_unlock:
 	mutex_unlock(&core_lists);
 	return res;
 
-out_unregister:
-	init_completion(&adap->dev_released); /* Needed? */
-	device_unregister(&adap->dev);
-	wait_for_completion(&adap->dev_released);
 out_list:
 	list_del(&adap->list);
 	idr_remove(&i2c_adapter_idr, adap->nr);
@@ -278,7 +275,6 @@ int i2c_del_adapter(struct i2c_adapter *adap)
 
 	/* clean up the sysfs representation */
 	init_completion(&adap->dev_released);
-	device_remove_file(&adap->dev, &dev_attr_name);
 	device_unregister(&adap->dev);
 	list_del(&adap->list);