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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>
52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
/*
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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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* SPDX-License-Identifier: GPL-2.0+
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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_uclass_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_uclass_plat {
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const char *label;
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};
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struct led_ops {
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/**
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* set_on() - set the state of an LED
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*
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* @dev: LED device to change
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* @on: 1 to turn the LED on, 0 to turn it off
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* @return 0 if OK, -ve on error
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*/
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int (*set_on)(struct udevice *dev, int on);
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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_on() - set the state of an LED
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*
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* @dev: LED device to change
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* @on: 1 to turn the LED on, 0 to turn it off
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* @return 0 if OK, -ve on error
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*/
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int led_set_on(struct udevice *dev, int on);
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#endif
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