1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Copyright 2006 - Florian Fainelli <florian@openwrt.org>
 4 *
 5 * Control the Cobalt Qube/RaQ front LED
 6 */
 7#include <linux/io.h>
 8#include <linux/ioport.h>
 9#include <linux/leds.h>
10#include <linux/module.h>
11#include <linux/platform_device.h>
12#include <linux/types.h>
13
14#define LED_FRONT_LEFT	0x01
15#define LED_FRONT_RIGHT	0x02
16
17static void __iomem *led_port;
18static u8 led_value;
19
20static void qube_front_led_set(struct led_classdev *led_cdev,
21			       enum led_brightness brightness)
22{
23	if (brightness)
24		led_value = LED_FRONT_LEFT | LED_FRONT_RIGHT;
25	else
26		led_value = ~(LED_FRONT_LEFT | LED_FRONT_RIGHT);
27	writeb(led_value, led_port);
28}
29
30static struct led_classdev qube_front_led = {
31	.name			= "qube::front",
32	.brightness		= LED_FULL,
33	.brightness_set		= qube_front_led_set,
34	.default_trigger	= "default-on",
35};
36
37static int cobalt_qube_led_probe(struct platform_device *pdev)
38{
39	struct resource *res;
40
41	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
42	if (!res)
43		return -EBUSY;
44
45	led_port = devm_ioremap(&pdev->dev, res->start, resource_size(res));
46	if (!led_port)
47		return -ENOMEM;
48
49	led_value = LED_FRONT_LEFT | LED_FRONT_RIGHT;
50	writeb(led_value, led_port);
51
52	return devm_led_classdev_register(&pdev->dev, &qube_front_led);
53}
54
55static struct platform_driver cobalt_qube_led_driver = {
56	.probe	= cobalt_qube_led_probe,
57	.driver	= {
58		.name	= "cobalt-qube-leds",
59	},
60};
61
62module_platform_driver(cobalt_qube_led_driver);
63
64MODULE_LICENSE("GPL");
65MODULE_DESCRIPTION("Front LED support for Cobalt Server");
66MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
67MODULE_ALIAS("platform:cobalt-qube-leds");