38 lines
1.4 KiB
Diff
38 lines
1.4 KiB
Diff
From 052c38eb17e866c5b4cd43924e7a5e20167b55c0 Mon Sep 17 00:00:00 2001
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From: Andrew Lunn <andrew@lunn.ch>
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Date: Mon, 29 May 2023 18:32:32 +0200
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Subject: [PATCH 02/13] 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
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or subsystem.
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For example, an LED could be blinked to indicate a network device is
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receiving packets, or a disk is reading blocks. To correctly enable and
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request the hw control of the LED, the trigger has to check if the
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network interface or block device configured via a /sys/class/led file
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match the one the LED driver provide for hw control for.
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Provide an API call to get the device which the LED blinks for.
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Signed-off-by: Andrew Lunn <andrew@lunn.ch>
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Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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include/linux/leds.h | 6 ++++++
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1 file changed, 6 insertions(+)
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--- a/include/linux/leds.h
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+++ b/include/linux/leds.h
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@@ -201,6 +201,12 @@ struct led_classdev {
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*/
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int (*hw_control_get)(struct led_classdev *led_cdev,
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unsigned long *flags);
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+ /*
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+ * Get the device this LED blinks in response to.
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+ * e.g. for a PHY LED, it is the network device. If the LED is
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+ * not yet associated to a device, return NULL.
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+ */
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+ struct device *(*hw_control_get_device)(struct led_classdev *led_cdev);
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#endif
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#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
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