u-boot/include/led.h
Simon Glass fb8a5ffc77 led: Return -ENODEV if the LED device cannot be found
We normally use -ENODEV for a missing device, rather than -ENOENT. The
latter is reserved for when we have a device but cannot find something
within it.

Also avoid looking at the root LED device since it is only a container.

Signed-off-by: Simon Glass <sjg@chromium.org>
2015-07-21 17:39:32 -06:00

52 lines
1.1 KiB
C

/*
* 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, -ENODEV if not found, other -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