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leds: add API to get attached device for LED hw control

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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@lunn.ch>
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Lunn 2023-05-29 18:32:32 +02:00 • committed by David S. Miller
parent ed554d3f94
commit 052c38eb17
1 changed files with 6 additions and 0 deletions
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6
include/linux/leds.h
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@ -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