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- From ed554d3f945179c5b159bddfad7be34b403fe11a Mon Sep 17 00:00:00 2001
- From: Christian Marangi <[email protected]>
- Date: Mon, 29 May 2023 18:32:31 +0200
- Subject: [PATCH 01/13] leds: add APIs 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 APIs 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.
- Add hw_control_is_supported() to ask the LED driver if the requested
- mode by the trigger are supported and the LED can be setup to follow
- the requested modes.
- Deactivate hardware blink control by setting brightness to LED_OFF via
- the brightness_set() callback.
- Signed-off-by: Christian Marangi <[email protected]>
- Reviewed-by: Andrew Lunn <[email protected]>
- Signed-off-by: David S. Miller <[email protected]>
- ---
- include/linux/leds.h | 37 +++++++++++++++++++++++++++++++++++++
- 1 file changed, 37 insertions(+)
- --- a/include/linux/leds.h
- +++ b/include/linux/leds.h
- @@ -164,6 +164,43 @@ 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;
- + /*
- + * Check if the LED driver supports the requested mode provided by the
- + * defined supported trigger to setup the LED to hw control mode.
- + *
- + * Return 0 on success. Return -EOPNOTSUPP when the passed flags are not
- + * supported and software fallback needs to be used.
- + * Return a negative error number on any other case for check fail due
- + * to various reason like device not ready or timeouts.
- + */
- + int (*hw_control_is_supported)(struct led_classdev *led_cdev,
- + unsigned long flags);
- + /*
- + * 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.
- + *
- + * Return 0 on success, a negative error number on flags apply fail.
- + */
- + 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.
- + *
- + * Return 0 on success, a negative error number on failing parsing the
- + * initial mode. Error from this function is NOT FATAL as the device
- + * may be in a not supported initial state by the attached LED trigger.
- + */
- + int (*hw_control_get)(struct led_classdev *led_cdev,
- + unsigned long *flags);
- #endif
-
- #ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
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