openwrt/target/linux/generic/backport-5.15/818-v6.5-06-leds-trigger-netdev-add-basic-check-for-hw-control-s.patch

From 6352f25f9fadba59d5df2ba7139495759ccc81d5 Mon Sep 17 00:00:00 2001
From: Christian Marangi <ansuelsmth@gmail.com>
Date: Mon, 29 May 2023 18:32:36 +0200
Subject: [PATCH 06/13] leds: trigger: netdev: add basic check for hw control
 support

Add basic check for hw control support. Check if the required API are
defined and check if the defined trigger supported in hw control for the
LED driver match netdev.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/leds/trigger/ledtrig-netdev.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

--- a/drivers/leds/trigger/ledtrig-netdev.c
+++ b/drivers/leds/trigger/ledtrig-netdev.c
@@ -92,8 +92,22 @@ static void set_baseline_state(struct le
 	}
 }
 
+static bool supports_hw_control(struct led_classdev *led_cdev)
+{
+	if (!led_cdev->hw_control_get || !led_cdev->hw_control_set ||
+	    !led_cdev->hw_control_is_supported)
+		return false;
+
+	return !strcmp(led_cdev->hw_control_trigger, led_cdev->trigger->name);
+}
+
 static bool can_hw_control(struct led_netdev_data *trigger_data)
 {
+	struct led_classdev *led_cdev = trigger_data->led_cdev;
+
+	if (!supports_hw_control(led_cdev))
+		return false;
+
 	return false;
 }