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8877bc51a8
Mikhail Kshevetskiy <mikhail.kshevetskiy@iopsys.eu> says: v2 changes: * Drop sw_blink_state structure, move its necessary fields to led_uc_plat structure. * Add cyclic_info pointer to led_uc_plat structure. This simplify code a lot. * Remove cyclic function search logic. Not needed anymore. * Fix blinking period. It was twice large. * Other cleanups. v3 changes: * Adapt code to recent cyclic function changes * Move software blinking functions to separate file * Other small changes v4 changes: * Refactoring of led_set_period() function v5 changes * Fix compilation if CONFIG_LED_BLINK is not defined v6 changes: * Enable LEDST_BLINK state unconditionally. * Function led_set_period() becomes available when CONFIG_LED_BLINK is disabled. This makes led code simpler. * Software blinking requires about 100 bytes of data for a led. It's not a good idea to allocate so much memory for each supported led. Change the code to allocate blinking data only for required leds.
145 lines
3.3 KiB
C
145 lines
3.3 KiB
C
/* 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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#include <stdbool.h>
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#include <cyclic.h>
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struct udevice;
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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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LEDST_BLINK,
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LEDST_COUNT,
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};
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enum led_sw_blink_state_t {
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LED_SW_BLINK_ST_DISABLED,
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LED_SW_BLINK_ST_NOT_READY,
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LED_SW_BLINK_ST_OFF,
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LED_SW_BLINK_ST_ON,
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};
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struct led_sw_blink {
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enum led_sw_blink_state_t state;
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struct udevice *dev;
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struct cyclic_info cyclic;
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const char cyclic_name[0];
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};
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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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* @default_state: LED default state
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*/
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struct led_uc_plat {
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const char *label;
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enum led_state_t default_state;
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#ifdef CONFIG_LED_SW_BLINK
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struct led_sw_blink *sw_blink;
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#endif
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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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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_bind_generic() - bind children of parent to given driver
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*
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* @parent: Top-level LED device
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* @driver_name: Driver for handling individual child nodes
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*/
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int led_bind_generic(struct udevice *parent, const char *driver_name);
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/* Internal functions for software blinking. Do not use them in your code */
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int led_sw_set_period(struct udevice *dev, int period_ms);
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bool led_sw_is_blinking(struct udevice *dev);
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bool led_sw_on_state_change(struct udevice *dev, enum led_state_t state);
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#endif
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