1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * LEDs driver for Soekris net48xx
4 *
5 * Copyright (C) 2006 Chris Boot <bootc@bootc.net>
6 *
7 * Based on leds-ams-delta.c
8 */
9
10#include <linux/kernel.h>
11#include <linux/init.h>
12#include <linux/platform_device.h>
13#include <linux/leds.h>
14#include <linux/err.h>
15#include <linux/io.h>
16#include <linux/nsc_gpio.h>
17#include <linux/scx200_gpio.h>
18#include <linux/module.h>
19
20#define DRVNAME "net48xx-led"
21#define NET48XX_ERROR_LED_GPIO	20
22
23static struct platform_device *pdev;
24
25static void net48xx_error_led_set(struct led_classdev *led_cdev,
26		enum led_brightness value)
27{
28	scx200_gpio_ops.gpio_set(NET48XX_ERROR_LED_GPIO, value ? 1 : 0);
29}
30
31static struct led_classdev net48xx_error_led = {
32	.name		= "net48xx::error",
33	.brightness_set	= net48xx_error_led_set,
34	.flags		= LED_CORE_SUSPENDRESUME,
35};
36
37static int net48xx_led_probe(struct platform_device *pdev)
38{
39	return devm_led_classdev_register(&pdev->dev, &net48xx_error_led);
40}
41
42static struct platform_driver net48xx_led_driver = {
43	.probe		= net48xx_led_probe,
44	.driver		= {
45		.name		= DRVNAME,
46	},
47};
48
49static int __init net48xx_led_init(void)
50{
51	int ret;
52
53	/* small hack, but scx200_gpio doesn't set .dev if the probe fails */
54	if (!scx200_gpio_ops.dev) {
55		ret = -ENODEV;
56		goto out;
57	}
58
59	ret = platform_driver_register(&net48xx_led_driver);
60	if (ret < 0)
61		goto out;
62
63	pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
64	if (IS_ERR(pdev)) {
65		ret = PTR_ERR(pdev);
66		platform_driver_unregister(&net48xx_led_driver);
67		goto out;
68	}
69
70out:
71	return ret;
72}
73
74static void __exit net48xx_led_exit(void)
75{
76	platform_device_unregister(pdev);
77	platform_driver_unregister(&net48xx_led_driver);
78}
79
80module_init(net48xx_led_init);
81module_exit(net48xx_led_exit);
82
83MODULE_AUTHOR("Chris Boot <bootc@bootc.net>");
84MODULE_DESCRIPTION("Soekris net48xx LED driver");
85MODULE_LICENSE("GPL");
86
87