[PATCH v5 17/18] usb: simplify usbport trigger

[Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>]

The led trigger core learned a few things that allow to simplify the trigger drivers.
Make use of automated trigger attributes and error checking of the activate callback.
Also use the wrappers to set and get trigger_data.

Acked-by: Pavel Machek <pavel@xxxxxx>
Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
---
 drivers/usb/core/ledtrig-usbport.c | 31 +++++++++++-------------------
 1 file changed, 11 insertions(+), 20 deletions(-)

diff --git a/drivers/usb/core/ledtrig-usbport.c b/drivers/usb/core/ledtrig-usbport.c
index aa1d51458da7..dc7f7fd71684 100644
--- a/drivers/usb/core/ledtrig-usbport.c
+++ b/drivers/usb/core/ledtrig-usbport.c
@@ -113,11 +113,17 @@ static ssize_t usbport_trig_port_store(struct device *dev,
 static struct attribute *ports_attrs[] = {
 	NULL,
 };
+
 static const struct attribute_group ports_group = {
 	.name = "ports",
 	.attrs = ports_attrs,
 };
 
+static const struct attribute_group *ports_groups[] = {
+	&ports_group,
+	NULL
+};
+
 /***************************************
  * Adding & removing ports
  ***************************************/
@@ -301,59 +307,44 @@ static int usbport_trig_notify(struct notifier_block *nb, unsigned long action,
 static int usbport_trig_activate(struct led_classdev *led_cdev)
 {
 	struct usbport_trig_data *usbport_data;
-	int err;
 
 	usbport_data = kzalloc(sizeof(*usbport_data), GFP_KERNEL);
 	if (!usbport_data)
-		return 0;
+		return -ENOMEM;
 	usbport_data->led_cdev = led_cdev;
 
 	/* List of ports */
 	INIT_LIST_HEAD(&usbport_data->ports);
-	err = sysfs_create_group(&led_cdev->dev->kobj, &ports_group);
-	if (err)
-		goto err_free;
 	usb_for_each_dev(usbport_data, usbport_trig_add_usb_dev_ports);
 	usbport_trig_update_count(usbport_data);
 
 	/* Notifications */
-	usbport_data->nb.notifier_call = usbport_trig_notify,
-	led_cdev->trigger_data = usbport_data;
+	usbport_data->nb.notifier_call = usbport_trig_notify;
+	led_set_trigger_data(led_cdev, usbport_data);
 	usb_register_notify(&usbport_data->nb);
 
-	led_cdev->activated = true;
-	return 0;
-
-err_free:
-	kfree(usbport_data);
 	return 0;
 }
 
 static void usbport_trig_deactivate(struct led_classdev *led_cdev)
 {
-	struct usbport_trig_data *usbport_data = led_cdev->trigger_data;
+	struct usbport_trig_data *usbport_data = led_get_trigger_data(led_cdev);
 	struct usbport_trig_port *port, *tmp;
 
-	if (!led_cdev->activated)
-		return;
-
 	list_for_each_entry_safe(port, tmp, &usbport_data->ports, list) {
 		usbport_trig_remove_port(usbport_data, port);
 	}
 
 	usb_unregister_notify(&usbport_data->nb);
 
-	sysfs_remove_group(&led_cdev->dev->kobj, &ports_group);
-
 	kfree(usbport_data);
-
-	led_cdev->activated = false;
 }
 
 static struct led_trigger usbport_led_trigger = {
 	.name     = "usbport",
 	.activate = usbport_trig_activate,
 	.deactivate = usbport_trig_deactivate,
+	.groups = ports_groups,
 };
 
 static int __init usbport_trig_init(void)
-- 
2.18.0