can: flexcan: add LED trigger support

Add support for canbus activity led indicators on flexcan devices by
calling appropriate can_led_* functions.

These are only enabled when CONFIG_CAN_LEDS is Y, becomes no-op
otherwise.

Cc: Oliver Hartkopp <socketcan@hartkopp.net>
Cc: Wolfgang Grandegger <wg@grandegger.com>
Cc: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: NFabio Baltieri <fabio.baltieri@gmail.com>
Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/flexcan.c

@@ -23,6 +23,7 @@
 #include <linux/can.h>
 #include <linux/can/dev.h>
 #include <linux/can/error.h>
+#include <linux/can/led.h>
 #include <linux/can/platform/flexcan.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
@@ -564,6 +565,8 @@ static int flexcan_read_frame(struct net_device *dev)
 	stats->rx_packets++;
 	stats->rx_bytes += cf->can_dlc;
 
+	can_led_event(dev, CAN_LED_EVENT_RX);
+
 	return 1;
 }
 
@@ -652,6 +655,7 @@ static irqreturn_t flexcan_irq(int irq, void *dev_id)
 	if (reg_iflag1 & (1 << FLEXCAN_TX_BUF_ID)) {
 		stats->tx_bytes += can_get_echo_skb(dev, 0);
 		stats->tx_packets++;
+		can_led_event(dev, CAN_LED_EVENT_TX);
 		flexcan_write((1 << FLEXCAN_TX_BUF_ID), &regs->iflag1);
 		netif_wake_queue(dev);
 	}
@@ -865,6 +869,9 @@ static int flexcan_open(struct net_device *dev)
 	err = flexcan_chip_start(dev);
 	if (err)
 		goto out_close;
+
+	can_led_event(dev, CAN_LED_EVENT_OPEN);
+
 	napi_enable(&priv->napi);
 	netif_start_queue(dev);
 
@@ -893,6 +900,8 @@ static int flexcan_close(struct net_device *dev)
 
 	close_candev(dev);
 
+	can_led_event(dev, CAN_LED_EVENT_STOP);
+
 	return 0;
 }
 
@@ -1092,6 +1101,8 @@ static int flexcan_probe(struct platform_device *pdev)
 		goto failed_register;
 	}
 
+	devm_can_led_init(dev);
+
 	dev_info(&pdev->dev, "device registered (reg_base=%p, irq=%d)\n",
 		 priv->base, dev->irq);