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(parent: &pdev->dev, led_cdev: &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, id: -1, NULL, num: 0);
64 if (IS_ERR(ptr: pdev)) {
65 ret = PTR_ERR(ptr: 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

source code of linux/drivers/leds/leds-net48xx.c