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dm: Add support for LEDs

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Add a simple uclass for LEDs, so that these can be controlled by the device
tree and activated when needed. LEDs are referred to by their label.

This implementation requires a driver for each type of LED (e.g GPIO, I2C).

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2015-06-23 15:38:45 -06:00
parent 5725128507
commit 5917112c9e
9 changed files with 152 additions and 0 deletions
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51
include/led.h Normal file
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/*
* Copyright (c) 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __LED_H
#define __LED_H
/**
* struct led_uclass_plat - Platform data the uclass stores about each device
*
* @label: LED label
*/
struct led_uclass_plat {
const char *label;
};
struct led_ops {
/**
* set_on() - set the state of an LED
*
* @dev: LED device to change
* @on: 1 to turn the LED on, 0 to turn it off
* @return 0 if OK, -ve on error
*/
int (*set_on)(struct udevice *dev, int on);
};
#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, -ve on error
*/
int led_get_by_label(const char *label, struct udevice **devp);
/**
* led_set_on() - set the state of an LED
*
* @dev: LED device to change
* @on: 1 to turn the LED on, 0 to turn it off
* @return 0 if OK, -ve on error
*/
int led_set_on(struct udevice *dev, int on);
#endif