[net-next PATCH v2 02/13] leds: add API to get attached device for LED hw control

From: Christian Marangi
Date: Thu May 25 2023 - 10:55:07 EST

From: Andrew Lunn <andrew@xxxxxxx>

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@xxxxxxx>
Signed-off-by: Christian Marangi <ansuelsmth@xxxxxxxxx>
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);