linux-kernel - [net-next PATCH v4 10/13] leds: trigger: netdev: init mode if hw control already active

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Date:   Mon, 29 May 2023 18:32:40 +0200
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>,
        Jonathan Corbet <corbet@....net>, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Christian Marangi <ansuelsmth@...il.com>,
        linux-leds@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [net-next PATCH v4 10/13] leds: trigger: netdev: init mode if hw control already active

On netdev trigger activation, hw control may be already active by
default. If this is the case and a device is actually provided by
hw_control_get_device(), init the already active mode and set the
bool to hw_control bool to true to reflect the already set mode in the
trigger_data.

Co-developed-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
---
 drivers/leds/trigger/ledtrig-netdev.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/leds/trigger/ledtrig-netdev.c b/drivers/leds/trigger/ledtrig-netdev.c
index 0f3c2ace408d..e8bb9d0f85c0 100644
--- a/drivers/leds/trigger/ledtrig-netdev.c
+++ b/drivers/leds/trigger/ledtrig-netdev.c
@@ -454,6 +454,8 @@ static void netdev_trig_work(struct work_struct *work)
 static int netdev_trig_activate(struct led_classdev *led_cdev)
 {
 	struct led_netdev_data *trigger_data;
+	unsigned long mode;
+	struct device *dev;
 	int rc;
 
 	trigger_data = kzalloc(sizeof(struct led_netdev_data), GFP_KERNEL);
@@ -475,6 +477,21 @@ static int netdev_trig_activate(struct led_classdev *led_cdev)
 	atomic_set(&trigger_data->interval, msecs_to_jiffies(NETDEV_LED_DEFAULT_INTERVAL));
 	trigger_data->last_activity = 0;
 
+	/* Check if hw control is active by default on the LED.
+	 * Init already enabled mode in hw control.
+	 */
+	if (supports_hw_control(led_cdev) &&
+	    !led_cdev->hw_control_get(led_cdev, &mode)) {
+		dev = led_cdev->hw_control_get_device(led_cdev);
+		if (dev) {
+			const char *name = dev_name(dev);
+
+			set_device_name(trigger_data, name, strlen(name));
+			trigger_data->hw_control = true;
+			trigger_data->mode = mode;
+		}
+	}
+
 	led_set_trigger_data(led_cdev, trigger_data);
 
 	rc = register_netdevice_notifier(&trigger_data->notifier);
-- 
2.39.2