i2c: simplify boilerplate code for attribute groups

Declaring attribute groups can be done with macros these days, let's use
them for consistency and readability reasons. Also, put the ATTR macros
directly below the referenced functions while we are here.

Signed-off-by: Wolfram Sang <[e-mail]>

drivers/i2c/i2c-core.c

···
 	return sprintf(buf, "%s\n", dev->type == &i2c_client_type ?
 		       to_i2c_client(dev)->name : to_i2c_adapter(dev)->name);
 }
+static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 
 static ssize_t
 show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
···
 
 	return sprintf(buf, "%s%s\n", I2C_MODULE_PREFIX, client->name);
 }
-
-static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
 
 static struct attribute *i2c_dev_attrs[] = {
···
 	&dev_attr_modalias.attr,
 	NULL
 };
-
-static struct attribute_group i2c_dev_attr_group = {
-	.attrs		= i2c_dev_attrs,
-};
-
-static const struct attribute_group *i2c_dev_attr_groups[] = {
-	&i2c_dev_attr_group,
-	NULL
-};
+ATTRIBUTE_GROUPS(i2c_dev);
 
 struct bus_type i2c_bus_type = {
 	.name		= "i2c",
···
 EXPORT_SYMBOL_GPL(i2c_bus_type);
 
 static struct device_type i2c_client_type = {
-	.groups		= i2c_dev_attr_groups,
+	.groups		= i2c_dev_groups,
 	.uevent		= i2c_device_uevent,
 	.release	= i2c_client_dev_release,
 };
···
 
 	return count;
 }
+static DEVICE_ATTR(new_device, S_IWUSR, NULL, i2c_sysfs_new_device);
 
 /*
  * And of course let the users delete the devices they instantiated, if
···
 			"delete_device");
 	return res;
 }
-
-static DEVICE_ATTR(new_device, S_IWUSR, NULL, i2c_sysfs_new_device);
 static DEVICE_ATTR_IGNORE_LOCKDEP(delete_device, S_IWUSR, NULL,
 				   i2c_sysfs_delete_device);
 
···
 	&dev_attr_delete_device.attr,
 	NULL
 };
-
-static struct attribute_group i2c_adapter_attr_group = {
-	.attrs		= i2c_adapter_attrs,
-};
-
-static const struct attribute_group *i2c_adapter_attr_groups[] = {
-	&i2c_adapter_attr_group,
-	NULL
-};
+ATTRIBUTE_GROUPS(i2c_adapter);
 
 struct device_type i2c_adapter_type = {
-	.groups		= i2c_adapter_attr_groups,
+	.groups		= i2c_adapter_groups,
 	.release	= i2c_adapter_dev_release,
 };
 EXPORT_SYMBOL_GPL(i2c_adapter_type);