119 lines
2.6 KiB
C
119 lines
2.6 KiB
C
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/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#ifndef __LED_H
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#define __LED_H
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/**
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* struct led_uc_plat - Platform data the uclass stores about each device
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*
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* @label: LED label
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*/
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struct led_uc_plat {
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const char *label;
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};
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/**
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* struct led_uc_priv - Private data the uclass stores about each device
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*
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* @period_ms: Flash period in milliseconds
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*/
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struct led_uc_priv {
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int period_ms;
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};
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enum led_state_t {
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LEDST_OFF = 0,
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LEDST_ON = 1,
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LEDST_TOGGLE,
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#ifdef CONFIG_LED_BLINK
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LEDST_BLINK,
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#endif
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LEDST_COUNT,
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};
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struct led_ops {
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/**
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* set_state() - set the state of an LED
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*
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* @dev: LED device to change
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* @state: LED state to set
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* @return 0 if OK, -ve on error
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*/
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int (*set_state)(struct udevice *dev, enum led_state_t state);
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/**
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* led_get_state() - get the state of an LED
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*
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* @dev: LED device to change
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* @return LED state led_state_t, or -ve on error
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*/
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enum led_state_t (*get_state)(struct udevice *dev);
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#ifdef CONFIG_LED_BLINK
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/**
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* led_set_period() - set the blink period of an LED
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*
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* Thie records the period if supported, or returns -ENOSYS if not.
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* To start the LED blinking, use set_state().
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*
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* @dev: LED device to change
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* @period_ms: LED blink period in milliseconds
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* @return 0 if OK, -ve on error
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*/
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int (*set_period)(struct udevice *dev, int period_ms);
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#endif
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};
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#define led_get_ops(dev) ((struct led_ops *)(dev)->driver->ops)
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/**
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* led_get_by_label() - Find an LED device by label
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*
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* @label: LED label to look up
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* @devp: Returns the associated device, if found
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* @return 0 if found, -ENODEV if not found, other -ve on error
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*/
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int led_get_by_label(const char *label, struct udevice **devp);
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/**
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* led_set_state() - set the state of an LED
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*
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* @dev: LED device to change
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* @state: LED state to set
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* @return 0 if OK, -ve on error
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*/
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int led_set_state(struct udevice *dev, enum led_state_t state);
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/**
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* led_get_state() - get the state of an LED
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*
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* @dev: LED device to change
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* @return LED state led_state_t, or -ve on error
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*/
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enum led_state_t led_get_state(struct udevice *dev);
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/**
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* led_set_period() - set the blink period of an LED
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*
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* @dev: LED device to change
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* @period_ms: LED blink period in milliseconds
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* @return 0 if OK, -ve on error
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*/
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int led_set_period(struct udevice *dev, int period_ms);
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/**
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* led_default_state() - set the default state for all the LED
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*
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* This enables all leds which have default state.
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* see Documentation/devicetree/bindings/leds/common.txt
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*
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*/
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int led_default_state(void);
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#endif
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