summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-at91/leds.c
blob: fec03c59ff94f382a9026bf699a95b00bd7804e0 (plain)
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
/*
 * LED driver for Atmel AT91-based boards.
 *
 *  Copyright (C) SAN People (Pty) Ltd
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
*/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>

#include <mach/board.h>
#include <mach/gpio.h>


/* ------------------------------------------------------------------------- */

#if defined(CONFIG_NEW_LEDS)

#include <linux/platform_device.h>

/*
 * New cross-platform LED support.
 */

static struct gpio_led_platform_data led_data;

static struct platform_device at91_leds = {
	.name			= "leds-gpio",
	.id			= -1,
	.dev.platform_data	= &led_data,
};

void __init at91_gpio_leds(struct gpio_led *leds, int nr)
{
	int i;

	if (!nr)
		return;

	for (i = 0; i < nr; i++)
		at91_set_gpio_output(leds[i].gpio, leds[i].active_low);

	led_data.leds = leds;
	led_data.num_leds = nr;
	platform_device_register(&at91_leds);
}

#else
void __init at91_gpio_leds(struct gpio_led *leds, int nr) {}
#endif


/* ------------------------------------------------------------------------- */

#if defined(CONFIG_LEDS)

#include <asm/leds.h>

/*
 * Old ARM-specific LED framework; not fully functional when generic time is
 * in use.
 */

static u8 at91_leds_cpu;
static u8 at91_leds_timer;

static inline void at91_led_on(unsigned int led)
{
	at91_set_gpio_value(led, 0);
}

static inline void at91_led_off(unsigned int led)
{
	at91_set_gpio_value(led, 1);
}

static inline void at91_led_toggle(unsigned int led)
{
	unsigned long is_off = at91_get_gpio_value(led);
	if (is_off)
		at91_led_on(led);
	else
		at91_led_off(led);
}


/*
 * Handle LED events.
 */
static void at91_leds_event(led_event_t evt)
{
	unsigned long flags;

	local_irq_save(flags);

	switch(evt) {
	case led_start:		/* System startup */
		at91_led_on(at91_leds_cpu);
		break;

	case led_stop:		/* System stop / suspend */
		at91_led_off(at91_leds_cpu);
		break;

#ifdef CONFIG_LEDS_TIMER
	case led_timer:		/* Every 50 timer ticks */
		at91_led_toggle(at91_leds_timer);
		break;
#endif

#ifdef CONFIG_LEDS_CPU
	case led_idle_start:	/* Entering idle state */
		at91_led_off(at91_leds_cpu);
		break;

	case led_idle_end:	/* Exit idle state */
		at91_led_on(at91_leds_cpu);
		break;
#endif

	default:
		break;
	}

	local_irq_restore(flags);
}


static int __init leds_init(void)
{
	if (!at91_leds_timer || !at91_leds_cpu)
		return -ENODEV;

	leds_event = at91_leds_event;

	leds_event(led_start);
	return 0;
}

__initcall(leds_init);


void __init at91_init_leds(u8 cpu_led, u8 timer_led)
{
	/* Enable GPIO to access the LEDs */
	at91_set_gpio_output(cpu_led, 1);
	at91_set_gpio_output(timer_led, 1);

	at91_leds_cpu	= cpu_led;
	at91_leds_timer	= timer_led;
}

#else
void __init at91_init_leds(u8 cpu_led, u8 timer_led) {}
#endif
OpenPOWER on IntegriCloud