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75 lines
2.9 KiB
Diff
75 lines
2.9 KiB
Diff
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From ed554d3f945179c5b159bddfad7be34b403fe11a Mon Sep 17 00:00:00 2001
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From: Christian Marangi <ansuelsmth@gmail.com>
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Date: Mon, 29 May 2023 18:32:31 +0200
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Subject: [PATCH 01/13] leds: add APIs for LEDs hw control
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Add an option to permit LED driver to declare support for a specific
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trigger to use hw control and setup the LED to blink based on specific
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provided modes.
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Add APIs for LEDs hw control. These functions will be used to activate
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hardware control where a LED will use the provided flags, from an
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unique defined supported trigger, to setup the LED to be driven by
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hardware.
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Add hw_control_is_supported() to ask the LED driver if the requested
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mode by the trigger are supported and the LED can be setup to follow
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the requested modes.
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Deactivate hardware blink control by setting brightness to LED_OFF via
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the brightness_set() callback.
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Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
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Reviewed-by: Andrew Lunn <andrew@lunn.ch>
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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 | 37 +++++++++++++++++++++++++++++++++++++
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1 file changed, 37 insertions(+)
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--- a/include/linux/leds.h
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+++ b/include/linux/leds.h
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@@ -164,6 +164,43 @@ struct led_classdev {
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/* LEDs that have private triggers have this set */
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struct led_hw_trigger_type *trigger_type;
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+
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+ /* Unique trigger name supported by LED set in hw control mode */
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+ const char *hw_control_trigger;
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+ /*
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+ * Check if the LED driver supports the requested mode provided by the
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+ * defined supported trigger to setup the LED to hw control mode.
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+ *
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+ * Return 0 on success. Return -EOPNOTSUPP when the passed flags are not
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+ * supported and software fallback needs to be used.
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+ * Return a negative error number on any other case for check fail due
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+ * to various reason like device not ready or timeouts.
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+ */
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+ int (*hw_control_is_supported)(struct led_classdev *led_cdev,
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+ unsigned long flags);
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+ /*
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+ * Activate hardware control, LED driver will use the provided flags
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+ * from the supported trigger and setup the LED to be driven by hardware
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+ * following the requested mode from the trigger flags.
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+ * Deactivate hardware blink control by setting brightness to LED_OFF via
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+ * the brightness_set() callback.
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+ *
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+ * Return 0 on success, a negative error number on flags apply fail.
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+ */
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+ int (*hw_control_set)(struct led_classdev *led_cdev,
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+ unsigned long flags);
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+ /*
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+ * Get from the LED driver the current mode that the LED is set in hw
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+ * control mode and put them in flags.
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+ * Trigger can use this to get the initial state of a LED already set in
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+ * hardware blink control.
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+ *
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+ * Return 0 on success, a negative error number on failing parsing the
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+ * initial mode. Error from this function is NOT FATAL as the device
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+ * may be in a not supported initial state by the attached LED trigger.
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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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#endif
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#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
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