linux-kernel - [net-next PATCH v4 02/13] leds: add API to get attached device for LED hw control

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Message-Id: <20230529163243.9555-3-ansuelsmth@gmail.com>
Date:   Mon, 29 May 2023 18:32:32 +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 02/13] leds: add API to get attached device for LED hw control

From: Andrew Lunn <andrew@...n.ch>

Some specific LED triggers blink the LED based on events from a device
or subsystem.
For example, an LED could be blinked to indicate a network device is
receiving packets, or a disk is reading blocks. To correctly enable and
request the hw control of the LED, the trigger has to check if the
network interface or block device configured via a /sys/class/led file
match the one the LED driver provide for hw control for.

Provide an API call to get the device which the LED blinks for.

Signed-off-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
---
 include/linux/leds.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/leds.h b/include/linux/leds.h
index 4caf559b1922..3268b4e789d6 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -220,6 +220,12 @@ struct led_classdev {
 	 */
 	int			(*hw_control_get)(struct led_classdev *led_cdev,
 						  unsigned long *flags);
+	/*
+	 * Get the device this LED blinks in response to.
+	 * e.g. for a PHY LED, it is the network device. If the LED is
+	 * not yet associated to a device, return NULL.
+	 */
+	struct device		*(*hw_control_get_device)(struct led_classdev *led_cdev);
 #endif
 
 #ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
-- 
2.39.2