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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (c) 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*/
#ifndef __LED_H
#define __LED_H
#include <stdbool.h>
#include <cyclic.h>
struct udevice;
enum led_state_t {
LEDST_OFF = 0,
LEDST_ON = 1,
LEDST_TOGGLE,
LEDST_BLINK,
LEDST_COUNT,
};
enum led_sw_blink_state_t {
LED_SW_BLINK_ST_DISABLED,
LED_SW_BLINK_ST_NOT_READY,
LED_SW_BLINK_ST_OFF,
LED_SW_BLINK_ST_ON,
};
struct led_sw_blink {
enum led_sw_blink_state_t state;
struct udevice *dev;
struct cyclic_info cyclic;
const char cyclic_name[0];
};
/**
* struct led_uc_plat - Platform data the uclass stores about each device
*
* @label: LED label
* @default_state: LED default state
*/
struct led_uc_plat {
const char *label;
enum led_state_t default_state;
#ifdef CONFIG_LED_SW_BLINK
struct led_sw_blink *sw_blink;
#endif
};
/**
* struct led_uc_priv - Private data the uclass stores about each device
*
* @period_ms: Flash period in milliseconds
*/
struct led_uc_priv {
int period_ms;
};
struct led_ops {
/**
* set_state() - set the state of an LED
*
* @dev: LED device to change
* @state: LED state to set
* @return 0 if OK, -ve on error
*/
int (*set_state)(struct udevice *dev, enum led_state_t state);
/**
* led_get_state() - get the state of an LED
*
* @dev: LED device to change
* @return LED state led_state_t, or -ve on error
*/
enum led_state_t (*get_state)(struct udevice *dev);
#ifdef CONFIG_LED_BLINK
/**
* led_set_period() - set the blink period of an LED
*
* Thie records the period if supported, or returns -ENOSYS if not.
* To start the LED blinking, use set_state().
*
* @dev: LED device to change
* @period_ms: LED blink period in milliseconds
* @return 0 if OK, -ve on error
*/
int (*set_period)(struct udevice *dev, int period_ms);
#endif
};
#define led_get_ops(dev) ((struct led_ops *)(dev)->driver->ops)
/**
* led_get_by_label() - Find an LED device by label
*
* @label: LED label to look up
* @devp: Returns the associated device, if found
* Return: 0 if found, -ENODEV if not found, other -ve on error
*/
int led_get_by_label(const char *label, struct udevice **devp);
/**
* led_set_state() - set the state of an LED
*
* @dev: LED device to change
* @state: LED state to set
* Return: 0 if OK, -ve on error
*/
int led_set_state(struct udevice *dev, enum led_state_t state);
/**
* led_get_state() - get the state of an LED
*
* @dev: LED device to change
* Return: LED state led_state_t, or -ve on error
*/
enum led_state_t led_get_state(struct udevice *dev);
/**
* led_set_period() - set the blink period of an LED
*
* @dev: LED device to change
* @period_ms: LED blink period in milliseconds
* Return: 0 if OK, -ve on error
*/
int led_set_period(struct udevice *dev, int period_ms);
/**
* led_bind_generic() - bind children of parent to given driver
*
* @parent: Top-level LED device
* @driver_name: Driver for handling individual child nodes
*/
int led_bind_generic(struct udevice *parent, const char *driver_name);
/* Internal functions for software blinking. Do not use them in your code */
int led_sw_set_period(struct udevice *dev, int period_ms);
bool led_sw_is_blinking(struct udevice *dev);
bool led_sw_on_state_change(struct udevice *dev, enum led_state_t state);
#endif
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