1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Bachmann ot200 leds driver.
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
5*4882a593Smuzhiyun * Christian Gmeiner <christian.gmeiner@gmail.com>
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * License: GPL as published by the FSF.
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/kernel.h>
11*4882a593Smuzhiyun #include <linux/platform_device.h>
12*4882a593Smuzhiyun #include <linux/slab.h>
13*4882a593Smuzhiyun #include <linux/leds.h>
14*4882a593Smuzhiyun #include <linux/io.h>
15*4882a593Smuzhiyun #include <linux/module.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun struct ot200_led {
19*4882a593Smuzhiyun struct led_classdev cdev;
20*4882a593Smuzhiyun const char *name;
21*4882a593Smuzhiyun unsigned long port;
22*4882a593Smuzhiyun u8 mask;
23*4882a593Smuzhiyun };
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun /*
26*4882a593Smuzhiyun * The device has three leds on the back panel (led_err, led_init and led_run)
27*4882a593Smuzhiyun * and can handle up to seven leds on the front panel.
28*4882a593Smuzhiyun */
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun static struct ot200_led leds[] = {
31*4882a593Smuzhiyun {
32*4882a593Smuzhiyun .name = "led_run",
33*4882a593Smuzhiyun .port = 0x5a,
34*4882a593Smuzhiyun .mask = BIT(0),
35*4882a593Smuzhiyun },
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun .name = "led_init",
38*4882a593Smuzhiyun .port = 0x5a,
39*4882a593Smuzhiyun .mask = BIT(1),
40*4882a593Smuzhiyun },
41*4882a593Smuzhiyun {
42*4882a593Smuzhiyun .name = "led_err",
43*4882a593Smuzhiyun .port = 0x5a,
44*4882a593Smuzhiyun .mask = BIT(2),
45*4882a593Smuzhiyun },
46*4882a593Smuzhiyun {
47*4882a593Smuzhiyun .name = "led_1",
48*4882a593Smuzhiyun .port = 0x49,
49*4882a593Smuzhiyun .mask = BIT(6),
50*4882a593Smuzhiyun },
51*4882a593Smuzhiyun {
52*4882a593Smuzhiyun .name = "led_2",
53*4882a593Smuzhiyun .port = 0x49,
54*4882a593Smuzhiyun .mask = BIT(5),
55*4882a593Smuzhiyun },
56*4882a593Smuzhiyun {
57*4882a593Smuzhiyun .name = "led_3",
58*4882a593Smuzhiyun .port = 0x49,
59*4882a593Smuzhiyun .mask = BIT(4),
60*4882a593Smuzhiyun },
61*4882a593Smuzhiyun {
62*4882a593Smuzhiyun .name = "led_4",
63*4882a593Smuzhiyun .port = 0x49,
64*4882a593Smuzhiyun .mask = BIT(3),
65*4882a593Smuzhiyun },
66*4882a593Smuzhiyun {
67*4882a593Smuzhiyun .name = "led_5",
68*4882a593Smuzhiyun .port = 0x49,
69*4882a593Smuzhiyun .mask = BIT(2),
70*4882a593Smuzhiyun },
71*4882a593Smuzhiyun {
72*4882a593Smuzhiyun .name = "led_6",
73*4882a593Smuzhiyun .port = 0x49,
74*4882a593Smuzhiyun .mask = BIT(1),
75*4882a593Smuzhiyun },
76*4882a593Smuzhiyun {
77*4882a593Smuzhiyun .name = "led_7",
78*4882a593Smuzhiyun .port = 0x49,
79*4882a593Smuzhiyun .mask = BIT(0),
80*4882a593Smuzhiyun }
81*4882a593Smuzhiyun };
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun static DEFINE_SPINLOCK(value_lock);
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun /*
86*4882a593Smuzhiyun * we need to store the current led states, as it is not
87*4882a593Smuzhiyun * possible to read the current led state via inb().
88*4882a593Smuzhiyun */
89*4882a593Smuzhiyun static u8 leds_back;
90*4882a593Smuzhiyun static u8 leds_front;
91*4882a593Smuzhiyun
ot200_led_brightness_set(struct led_classdev * led_cdev,enum led_brightness value)92*4882a593Smuzhiyun static void ot200_led_brightness_set(struct led_classdev *led_cdev,
93*4882a593Smuzhiyun enum led_brightness value)
94*4882a593Smuzhiyun {
95*4882a593Smuzhiyun struct ot200_led *led = container_of(led_cdev, struct ot200_led, cdev);
96*4882a593Smuzhiyun u8 *val;
97*4882a593Smuzhiyun unsigned long flags;
98*4882a593Smuzhiyun
99*4882a593Smuzhiyun spin_lock_irqsave(&value_lock, flags);
100*4882a593Smuzhiyun
101*4882a593Smuzhiyun if (led->port == 0x49)
102*4882a593Smuzhiyun val = &leds_front;
103*4882a593Smuzhiyun else if (led->port == 0x5a)
104*4882a593Smuzhiyun val = &leds_back;
105*4882a593Smuzhiyun else
106*4882a593Smuzhiyun BUG();
107*4882a593Smuzhiyun
108*4882a593Smuzhiyun if (value == LED_OFF)
109*4882a593Smuzhiyun *val &= ~led->mask;
110*4882a593Smuzhiyun else
111*4882a593Smuzhiyun *val |= led->mask;
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun outb(*val, led->port);
114*4882a593Smuzhiyun spin_unlock_irqrestore(&value_lock, flags);
115*4882a593Smuzhiyun }
116*4882a593Smuzhiyun
ot200_led_probe(struct platform_device * pdev)117*4882a593Smuzhiyun static int ot200_led_probe(struct platform_device *pdev)
118*4882a593Smuzhiyun {
119*4882a593Smuzhiyun int i;
120*4882a593Smuzhiyun int ret;
121*4882a593Smuzhiyun
122*4882a593Smuzhiyun for (i = 0; i < ARRAY_SIZE(leds); i++) {
123*4882a593Smuzhiyun
124*4882a593Smuzhiyun leds[i].cdev.name = leds[i].name;
125*4882a593Smuzhiyun leds[i].cdev.brightness_set = ot200_led_brightness_set;
126*4882a593Smuzhiyun
127*4882a593Smuzhiyun ret = devm_led_classdev_register(&pdev->dev, &leds[i].cdev);
128*4882a593Smuzhiyun if (ret < 0)
129*4882a593Smuzhiyun return ret;
130*4882a593Smuzhiyun }
131*4882a593Smuzhiyun
132*4882a593Smuzhiyun leds_front = 0; /* turn off all front leds */
133*4882a593Smuzhiyun leds_back = BIT(1); /* turn on init led */
134*4882a593Smuzhiyun outb(leds_front, 0x49);
135*4882a593Smuzhiyun outb(leds_back, 0x5a);
136*4882a593Smuzhiyun
137*4882a593Smuzhiyun return 0;
138*4882a593Smuzhiyun }
139*4882a593Smuzhiyun
140*4882a593Smuzhiyun static struct platform_driver ot200_led_driver = {
141*4882a593Smuzhiyun .probe = ot200_led_probe,
142*4882a593Smuzhiyun .driver = {
143*4882a593Smuzhiyun .name = "leds-ot200",
144*4882a593Smuzhiyun },
145*4882a593Smuzhiyun };
146*4882a593Smuzhiyun
147*4882a593Smuzhiyun module_platform_driver(ot200_led_driver);
148*4882a593Smuzhiyun
149*4882a593Smuzhiyun MODULE_AUTHOR("Sebastian A. Siewior <bigeasy@linutronix.de>");
150*4882a593Smuzhiyun MODULE_DESCRIPTION("ot200 LED driver");
151*4882a593Smuzhiyun MODULE_LICENSE("GPL");
152*4882a593Smuzhiyun MODULE_ALIAS("platform:leds-ot200");
153