leds-ot200.c
3.01 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
/*
* Bachmann ot200 leds driver.
*
* Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
* Christian Gmeiner <christian.gmeiner@gmail.com>
*
* License: GPL as published by the FSF.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/leds.h>
#include <linux/io.h>
#include <linux/module.h>
struct ot200_led {
struct led_classdev cdev;
const char *name;
unsigned long port;
u8 mask;
};
/*
* The device has three leds on the back panel (led_err, led_init and led_run)
* and can handle up to seven leds on the front panel.
*/
static struct ot200_led leds[] = {
{
.name = "led_run",
.port = 0x5a,
.mask = BIT(0),
},
{
.name = "led_init",
.port = 0x5a,
.mask = BIT(1),
},
{
.name = "led_err",
.port = 0x5a,
.mask = BIT(2),
},
{
.name = "led_1",
.port = 0x49,
.mask = BIT(6),
},
{
.name = "led_2",
.port = 0x49,
.mask = BIT(5),
},
{
.name = "led_3",
.port = 0x49,
.mask = BIT(4),
},
{
.name = "led_4",
.port = 0x49,
.mask = BIT(3),
},
{
.name = "led_5",
.port = 0x49,
.mask = BIT(2),
},
{
.name = "led_6",
.port = 0x49,
.mask = BIT(1),
},
{
.name = "led_7",
.port = 0x49,
.mask = BIT(0),
}
};
static DEFINE_SPINLOCK(value_lock);
/*
* we need to store the current led states, as it is not
* possible to read the current led state via inb().
*/
static u8 leds_back;
static u8 leds_front;
static void ot200_led_brightness_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct ot200_led *led = container_of(led_cdev, struct ot200_led, cdev);
u8 *val;
unsigned long flags;
spin_lock_irqsave(&value_lock, flags);
if (led->port == 0x49)
val = &leds_front;
else if (led->port == 0x5a)
val = &leds_back;
else
BUG();
if (value == LED_OFF)
*val &= ~led->mask;
else
*val |= led->mask;
outb(*val, led->port);
spin_unlock_irqrestore(&value_lock, flags);
}
static int ot200_led_probe(struct platform_device *pdev)
{
int i;
int ret;
for (i = 0; i < ARRAY_SIZE(leds); i++) {
leds[i].cdev.name = leds[i].name;
leds[i].cdev.brightness_set = ot200_led_brightness_set;
ret = led_classdev_register(&pdev->dev, &leds[i].cdev);
if (ret < 0)
goto err;
}
leds_front = 0; /* turn off all front leds */
leds_back = BIT(1); /* turn on init led */
outb(leds_front, 0x49);
outb(leds_back, 0x5a);
return 0;
err:
for (i = i - 1; i >= 0; i--)
led_classdev_unregister(&leds[i].cdev);
return ret;
}
static int ot200_led_remove(struct platform_device *pdev)
{
int i;
for (i = 0; i < ARRAY_SIZE(leds); i++)
led_classdev_unregister(&leds[i].cdev);
return 0;
}
static struct platform_driver ot200_led_driver = {
.probe = ot200_led_probe,
.remove = ot200_led_remove,
.driver = {
.name = "leds-ot200",
.owner = THIS_MODULE,
},
};
module_platform_driver(ot200_led_driver);
MODULE_AUTHOR("Sebastian A. Siewior <bigeasy@linutronix.de>");
MODULE_DESCRIPTION("ot200 LED driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:leds-ot200");