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Sebastian Andrzej Siewiore9a45932012-01-20 14:33:59 -08001/*
2 * Bachmann ot200 leds driver.
3 *
4 * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
5 * Christian Gmeiner <christian.gmeiner@gmail.com>
6 *
7 * License: GPL as published by the FSF.
8 */
9
10#include <linux/kernel.h>
Sebastian Andrzej Siewiore9a45932012-01-20 14:33:59 -080011#include <linux/platform_device.h>
12#include <linux/slab.h>
13#include <linux/leds.h>
14#include <linux/io.h>
15#include <linux/module.h>
16
17
18struct ot200_led {
19 struct led_classdev cdev;
20 const char *name;
21 unsigned long port;
22 u8 mask;
23};
24
25/*
26 * The device has three leds on the back panel (led_err, led_init and led_run)
27 * and can handle up to seven leds on the front panel.
28 */
29
30static struct ot200_led leds[] = {
31 {
32 .name = "led_run",
33 .port = 0x5a,
34 .mask = BIT(0),
35 },
36 {
37 .name = "led_init",
38 .port = 0x5a,
39 .mask = BIT(1),
40 },
41 {
42 .name = "led_err",
43 .port = 0x5a,
44 .mask = BIT(2),
45 },
46 {
47 .name = "led_1",
48 .port = 0x49,
Christian Gmeiner4b949b82013-05-24 15:55:22 -070049 .mask = BIT(6),
Sebastian Andrzej Siewiore9a45932012-01-20 14:33:59 -080050 },
51 {
52 .name = "led_2",
53 .port = 0x49,
Christian Gmeiner4b949b82013-05-24 15:55:22 -070054 .mask = BIT(5),
Sebastian Andrzej Siewiore9a45932012-01-20 14:33:59 -080055 },
56 {
57 .name = "led_3",
58 .port = 0x49,
Christian Gmeiner4b949b82013-05-24 15:55:22 -070059 .mask = BIT(4),
Sebastian Andrzej Siewiore9a45932012-01-20 14:33:59 -080060 },
61 {
62 .name = "led_4",
63 .port = 0x49,
Christian Gmeiner4b949b82013-05-24 15:55:22 -070064 .mask = BIT(3),
Sebastian Andrzej Siewiore9a45932012-01-20 14:33:59 -080065 },
66 {
67 .name = "led_5",
68 .port = 0x49,
Christian Gmeiner4b949b82013-05-24 15:55:22 -070069 .mask = BIT(2),
Sebastian Andrzej Siewiore9a45932012-01-20 14:33:59 -080070 },
71 {
72 .name = "led_6",
73 .port = 0x49,
Christian Gmeiner4b949b82013-05-24 15:55:22 -070074 .mask = BIT(1),
Sebastian Andrzej Siewiore9a45932012-01-20 14:33:59 -080075 },
76 {
77 .name = "led_7",
78 .port = 0x49,
Christian Gmeiner4b949b82013-05-24 15:55:22 -070079 .mask = BIT(0),
Sebastian Andrzej Siewiore9a45932012-01-20 14:33:59 -080080 }
81};
82
83static DEFINE_SPINLOCK(value_lock);
84
85/*
86 * we need to store the current led states, as it is not
87 * possible to read the current led state via inb().
88 */
89static u8 leds_back;
90static u8 leds_front;
91
92static void ot200_led_brightness_set(struct led_classdev *led_cdev,
93 enum led_brightness value)
94{
95 struct ot200_led *led = container_of(led_cdev, struct ot200_led, cdev);
96 u8 *val;
97 unsigned long flags;
98
99 spin_lock_irqsave(&value_lock, flags);
100
101 if (led->port == 0x49)
102 val = &leds_front;
103 else if (led->port == 0x5a)
104 val = &leds_back;
105 else
106 BUG();
107
108 if (value == LED_OFF)
109 *val &= ~led->mask;
110 else
111 *val |= led->mask;
112
113 outb(*val, led->port);
114 spin_unlock_irqrestore(&value_lock, flags);
115}
116
Bill Pemberton98ea1ea2012-11-19 13:23:02 -0500117static int ot200_led_probe(struct platform_device *pdev)
Sebastian Andrzej Siewiore9a45932012-01-20 14:33:59 -0800118{
119 int i;
120 int ret;
121
122 for (i = 0; i < ARRAY_SIZE(leds); i++) {
123
124 leds[i].cdev.name = leds[i].name;
125 leds[i].cdev.brightness_set = ot200_led_brightness_set;
126
127 ret = led_classdev_register(&pdev->dev, &leds[i].cdev);
128 if (ret < 0)
129 goto err;
130 }
131
132 leds_front = 0; /* turn off all front leds */
133 leds_back = BIT(1); /* turn on init led */
134 outb(leds_front, 0x49);
135 outb(leds_back, 0x5a);
136
137 return 0;
138
139err:
140 for (i = i - 1; i >= 0; i--)
141 led_classdev_unregister(&leds[i].cdev);
142
143 return ret;
144}
145
Bill Pemberton678e8a62012-11-19 13:26:00 -0500146static int ot200_led_remove(struct platform_device *pdev)
Sebastian Andrzej Siewiore9a45932012-01-20 14:33:59 -0800147{
148 int i;
149
150 for (i = 0; i < ARRAY_SIZE(leds); i++)
151 led_classdev_unregister(&leds[i].cdev);
152
153 return 0;
154}
155
156static struct platform_driver ot200_led_driver = {
157 .probe = ot200_led_probe,
Bill Pembertondf07cf82012-11-19 13:20:20 -0500158 .remove = ot200_led_remove,
Sebastian Andrzej Siewiore9a45932012-01-20 14:33:59 -0800159 .driver = {
160 .name = "leds-ot200",
161 .owner = THIS_MODULE,
162 },
163};
164
165module_platform_driver(ot200_led_driver);
166
167MODULE_AUTHOR("Sebastian A. Siewior <bigeasy@linutronix.de>");
168MODULE_DESCRIPTION("ot200 LED driver");
169MODULE_LICENSE("GPL");
170MODULE_ALIAS("platform:leds-ot200");