can: usb_8dev: add LED trigger support

Add support for canbus activity led indicators on usb_8dev devices by
calling appropriate can_led functions.

These are only enabled when CONFIG_CAN_LEDS is Y, becomes no-op
otherwise.
Signed-off-by: Bernd Krumboeck <krumboeck@universalnet.at>
Signed-off-by: Fabio Baltieri <fabio.baltieri@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/usb/usb_8dev.c

@@ -33,6 +33,7 @@
 #include <linux/can.h>
 #include <linux/can/dev.h>
 #include <linux/can/error.h>
+#include <linux/can/led.h>
 
 /* driver constants */
 #define MAX_RX_URBS			20
@@ -497,6 +498,8 @@ static void usb_8dev_rx_can_msg(struct usb_8dev_priv *priv,
 
 		stats->rx_packets++;
 		stats->rx_bytes += cf->can_dlc;
+
+		can_led_event(priv->netdev, CAN_LED_EVENT_RX);
 	} else {
 		netdev_warn(priv->netdev, "frame type %d unknown",
 			 msg->type);
@@ -597,6 +600,8 @@ static void usb_8dev_write_bulk_callback(struct urb *urb)
 
 	can_get_echo_skb(netdev, context->echo_index);
 
+	can_led_event(netdev, CAN_LED_EVENT_TX);
+
 	/* Release context */
 	context->echo_index = MAX_TX_URBS;
 
@@ -819,6 +824,8 @@ static int usb_8dev_open(struct net_device *netdev)
 	if (err)
 		return err;
 
+	can_led_event(netdev, CAN_LED_EVENT_OPEN);
+
 	/* finally start device */
 	err = usb_8dev_start(priv);
 	if (err) {
@@ -871,6 +878,8 @@ static int usb_8dev_close(struct net_device *netdev)
 
 	close_candev(netdev);
 
+	can_led_event(netdev, CAN_LED_EVENT_STOP);
+
 	return err;
 }
 
@@ -978,6 +987,8 @@ static int usb_8dev_probe(struct usb_interface *intf,
 			 (version>>8) & 0xff, version & 0xff);
 	}
 
+	devm_can_led_init(netdev);
+
 	return 0;
 
 cleanup_cmd_msg_buffer: