1/*
2 * Driver for the LED found on the EBSA110 machine
3 * Based on Versatile and RealView machine LED code
4 *
5 * License terms: GNU General Public License (GPL) version 2
6 * Author: Bryan Wu <bryan.wu@canonical.com>
7 */
8#include <linux/kernel.h>
9#include <linux/init.h>
10#include <linux/io.h>
11#include <linux/slab.h>
12#include <linux/leds.h>
13
14#include <asm/mach-types.h>
15
16#include "core.h"
17
18#if defined(CONFIG_NEW_LEDS) && defined(CONFIG_LEDS_CLASS)
19static void ebsa110_led_set(struct led_classdev *cdev,
20			      enum led_brightness b)
21{
22	u8 reg = __raw_readb(SOFT_BASE);
23
24	if (b != LED_OFF)
25		reg |= 0x80;
26	else
27		reg &= ~0x80;
28
29	__raw_writeb(reg, SOFT_BASE);
30}
31
32static enum led_brightness ebsa110_led_get(struct led_classdev *cdev)
33{
34	u8 reg = __raw_readb(SOFT_BASE);
35
36	return (reg & 0x80) ? LED_FULL : LED_OFF;
37}
38
39static int __init ebsa110_leds_init(void)
40{
41
42	struct led_classdev *cdev;
43	int ret;
44
45	if (!machine_is_ebsa110())
46		return -ENODEV;
47
48	cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
49	if (!cdev)
50		return -ENOMEM;
51
52	cdev->name = "ebsa110:0";
53	cdev->brightness_set = ebsa110_led_set;
54	cdev->brightness_get = ebsa110_led_get;
55	cdev->default_trigger = "heartbeat";
56
57	ret = led_classdev_register(NULL, cdev);
58	if (ret	< 0) {
59		kfree(cdev);
60		return ret;
61	}
62
63	return 0;
64}
65
66/*
67 * Since we may have triggers on any subsystem, defer registration
68 * until after subsystem_init.
69 */
70fs_initcall(ebsa110_leds_init);
71#endif
72