1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * LEDs driver for PCEngines WRAP
4 *
5 * Copyright (C) 2006 Kristian Kielhofner <kris@krisk.org>
6 *
7 * Based on leds-net48xx.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/scx200_gpio.h>
17#include <linux/module.h>
18
19#define DRVNAME "wrap-led"
20#define WRAP_POWER_LED_GPIO	2
21#define WRAP_ERROR_LED_GPIO	3
22#define WRAP_EXTRA_LED_GPIO	18
23
24static struct platform_device *pdev;
25
26static void wrap_power_led_set(struct led_classdev *led_cdev,
27		enum led_brightness value)
28{
29	if (value)
30		scx200_gpio_set_low(WRAP_POWER_LED_GPIO);
31	else
32		scx200_gpio_set_high(WRAP_POWER_LED_GPIO);
33}
34
35static void wrap_error_led_set(struct led_classdev *led_cdev,
36		enum led_brightness value)
37{
38	if (value)
39		scx200_gpio_set_low(WRAP_ERROR_LED_GPIO);
40	else
41		scx200_gpio_set_high(WRAP_ERROR_LED_GPIO);
42}
43
44static void wrap_extra_led_set(struct led_classdev *led_cdev,
45		enum led_brightness value)
46{
47	if (value)
48		scx200_gpio_set_low(WRAP_EXTRA_LED_GPIO);
49	else
50		scx200_gpio_set_high(WRAP_EXTRA_LED_GPIO);
51}
52
53static struct led_classdev wrap_power_led = {
54	.name			= "wrap::power",
55	.brightness_set		= wrap_power_led_set,
56	.default_trigger	= "default-on",
57	.flags			= LED_CORE_SUSPENDRESUME,
58};
59
60static struct led_classdev wrap_error_led = {
61	.name		= "wrap::error",
62	.brightness_set	= wrap_error_led_set,
63	.flags			= LED_CORE_SUSPENDRESUME,
64};
65
66static struct led_classdev wrap_extra_led = {
67	.name           = "wrap::extra",
68	.brightness_set = wrap_extra_led_set,
69	.flags			= LED_CORE_SUSPENDRESUME,
70};
71
72static int wrap_led_probe(struct platform_device *pdev)
73{
74	int ret;
75
76	ret = devm_led_classdev_register(&pdev->dev, &wrap_power_led);
77	if (ret < 0)
78		return ret;
79
80	ret = devm_led_classdev_register(&pdev->dev, &wrap_error_led);
81	if (ret < 0)
82		return ret;
83
84	return  devm_led_classdev_register(&pdev->dev, &wrap_extra_led);
85}
86
87static struct platform_driver wrap_led_driver = {
88	.probe		= wrap_led_probe,
89	.driver		= {
90		.name		= DRVNAME,
91	},
92};
93
94static int __init wrap_led_init(void)
95{
96	int ret;
97
98	if (!scx200_gpio_present()) {
99		ret = -ENODEV;
100		goto out;
101	}
102
103	ret = platform_driver_register(&wrap_led_driver);
104	if (ret < 0)
105		goto out;
106
107	pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
108	if (IS_ERR(pdev)) {
109		ret = PTR_ERR(pdev);
110		platform_driver_unregister(&wrap_led_driver);
111		goto out;
112	}
113
114out:
115	return ret;
116}
117
118static void __exit wrap_led_exit(void)
119{
120	platform_device_unregister(pdev);
121	platform_driver_unregister(&wrap_led_driver);
122}
123
124module_init(wrap_led_init);
125module_exit(wrap_led_exit);
126
127MODULE_AUTHOR("Kristian Kielhofner <kris@krisk.org>");
128MODULE_DESCRIPTION("PCEngines WRAP LED driver");
129MODULE_LICENSE("GPL");
130
131