1/*
2 * LEDs driver for Soekris net48xx
3 *
4 * Copyright (C) 2006 Chris Boot <bootc@bootc.net>
5 *
6 * Based on leds-ams-delta.c
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/platform_device.h>
16#include <linux/leds.h>
17#include <linux/err.h>
18#include <linux/io.h>
19#include <linux/nsc_gpio.h>
20#include <linux/scx200_gpio.h>
21#include <linux/module.h>
22
23#define DRVNAME "net48xx-led"
24#define NET48XX_ERROR_LED_GPIO	20
25
26static struct platform_device *pdev;
27
28static void net48xx_error_led_set(struct led_classdev *led_cdev,
29		enum led_brightness value)
30{
31	scx200_gpio_ops.gpio_set(NET48XX_ERROR_LED_GPIO, value ? 1 : 0);
32}
33
34static struct led_classdev net48xx_error_led = {
35	.name		= "net48xx::error",
36	.brightness_set	= net48xx_error_led_set,
37	.flags		= LED_CORE_SUSPENDRESUME,
38};
39
40static int net48xx_led_probe(struct platform_device *pdev)
41{
42	return led_classdev_register(&pdev->dev, &net48xx_error_led);
43}
44
45static int net48xx_led_remove(struct platform_device *pdev)
46{
47	led_classdev_unregister(&net48xx_error_led);
48	return 0;
49}
50
51static struct platform_driver net48xx_led_driver = {
52	.probe		= net48xx_led_probe,
53	.remove		= net48xx_led_remove,
54	.driver		= {
55		.name		= DRVNAME,
56	},
57};
58
59static int __init net48xx_led_init(void)
60{
61	int ret;
62
63	/* small hack, but scx200_gpio doesn't set .dev if the probe fails */
64	if (!scx200_gpio_ops.dev) {
65		ret = -ENODEV;
66		goto out;
67	}
68
69	ret = platform_driver_register(&net48xx_led_driver);
70	if (ret < 0)
71		goto out;
72
73	pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
74	if (IS_ERR(pdev)) {
75		ret = PTR_ERR(pdev);
76		platform_driver_unregister(&net48xx_led_driver);
77		goto out;
78	}
79
80out:
81	return ret;
82}
83
84static void __exit net48xx_led_exit(void)
85{
86	platform_device_unregister(pdev);
87	platform_driver_unregister(&net48xx_led_driver);
88}
89
90module_init(net48xx_led_init);
91module_exit(net48xx_led_exit);
92
93MODULE_AUTHOR("Chris Boot <bootc@bootc.net>");
94MODULE_DESCRIPTION("Soekris net48xx LED driver");
95MODULE_LICENSE("GPL");
96
97