1/*
2 * Driver for the 8 user LEDs found on the RealViews and Versatiles
3 * Based on DaVinci's DM365 board code
4 *
5 * License terms: GNU General Public License (GPL) version 2
6 * Author: Linus Walleij <triad@df.lth.se>
7 */
8#include <linux/kernel.h>
9#include <linux/init.h>
10#include <linux/module.h>
11#include <linux/io.h>
12#include <linux/slab.h>
13#include <linux/leds.h>
14#include <linux/platform_device.h>
15
16struct versatile_led {
17	void __iomem		*base;
18	struct led_classdev	cdev;
19	u8			mask;
20};
21
22/*
23 * The triggers lines up below will only be used if the
24 * LED triggers are compiled in.
25 */
26static const struct {
27	const char *name;
28	const char *trigger;
29} versatile_leds[] = {
30	{ "versatile:0", "heartbeat", },
31	{ "versatile:1", "mmc0", },
32	{ "versatile:2", "cpu0" },
33	{ "versatile:3", "cpu1" },
34	{ "versatile:4", "cpu2" },
35	{ "versatile:5", "cpu3" },
36	{ "versatile:6", },
37	{ "versatile:7", },
38};
39
40static void versatile_led_set(struct led_classdev *cdev,
41			      enum led_brightness b)
42{
43	struct versatile_led *led = container_of(cdev,
44						 struct versatile_led, cdev);
45	u32 reg = readl(led->base);
46
47	if (b != LED_OFF)
48		reg |= led->mask;
49	else
50		reg &= ~led->mask;
51	writel(reg, led->base);
52}
53
54static enum led_brightness versatile_led_get(struct led_classdev *cdev)
55{
56	struct versatile_led *led = container_of(cdev,
57						 struct versatile_led, cdev);
58	u32 reg = readl(led->base);
59
60	return (reg & led->mask) ? LED_FULL : LED_OFF;
61}
62
63static int versatile_leds_probe(struct platform_device *dev)
64{
65	int i;
66	struct resource *res;
67	void __iomem *base;
68
69	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
70	base = devm_ioremap_resource(&dev->dev, res);
71	if (IS_ERR(base))
72		return PTR_ERR(base);
73
74	/* All off */
75	writel(0, base);
76	for (i = 0; i < ARRAY_SIZE(versatile_leds); i++) {
77		struct versatile_led *led;
78
79		led = kzalloc(sizeof(*led), GFP_KERNEL);
80		if (!led)
81			break;
82
83		led->base = base;
84		led->cdev.name = versatile_leds[i].name;
85		led->cdev.brightness_set = versatile_led_set;
86		led->cdev.brightness_get = versatile_led_get;
87		led->cdev.default_trigger = versatile_leds[i].trigger;
88		led->mask = BIT(i);
89
90		if (led_classdev_register(NULL, &led->cdev) < 0) {
91			kfree(led);
92			break;
93		}
94	}
95
96	return 0;
97}
98
99static struct platform_driver versatile_leds_driver = {
100	.driver = {
101		.name   = "versatile-leds",
102	},
103	.probe = versatile_leds_probe,
104};
105
106module_platform_driver(versatile_leds_driver);
107
108MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
109MODULE_DESCRIPTION("ARM Versatile LED driver");
110MODULE_LICENSE("GPL v2");
111