linux-kernel - [PATCH 01/11] leds: add binding for LEDs hw control

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Date:   Thu, 27 Apr 2023 02:15:31 +0200
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Jonathan Corbet <corbet@....net>, Pavel Machek <pavel@....cz>,
        Lee Jones <lee@...nel.org>, 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-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-leds@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH 01/11] leds: add binding for LEDs hw control

Add an option to permit LED driver to declare support for a specific
trigger to use hw control and setup the LED to blink based on specific
provided modes.

Add binding for LEDs hw control. These functions will be used to activate
hardware control where a LED will use the provided flags, from an
unique defined supported trigger, to setup the LED to be driven by
hardware.

Deactivate hardware blink control by setting brightness to LED_OFF via
the brightness_set() callback.

Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
---
 include/linux/leds.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/include/linux/leds.h b/include/linux/leds.h
index ba4861ec73d3..b3bd1cc8ace8 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -154,6 +154,26 @@ struct led_classdev {
 
 	/* LEDs that have private triggers have this set */
 	struct led_hw_trigger_type	*trigger_type;
+
+	/* Unique trigger name supported by LED set in hw control mode */
+	const char		*hw_control_trigger;
+	/*
+	 * Activate hardware control, LED driver will use the provided flags
+	 * from the supported trigger and setup the LED to be driven by hardware
+	 * following the requested mode from the trigger flags.
+	 * Deactivate hardware blink control by setting brightness to LED_OFF via
+	 * the brightness_set() callback.
+	 */
+	int			(*hw_control_set)(struct led_classdev *led_cdev,
+						  unsigned long flags);
+	/*
+	 * Get from the LED driver the current mode that the LED is set in hw
+	 * control mode and put them in flags.
+	 * Trigger can use this to get the initial state of a LED already set in
+	 * hardware blink control.
+	 */
+	int			(*hw_control_get)(struct led_classdev *led_cdev,
+						  unsigned long *flags);
 #endif
 
 #ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
-- 
2.39.2