2 * LED driver for Atmel AT91-based boards.
4 * Copyright (C) SAN People (Pty) Ltd
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
16 #include <asm/mach-types.h>
17 #include <asm/arch/board.h>
18 #include <asm/arch/gpio.h>
21 /* ------------------------------------------------------------------------- */
23 #if defined(CONFIG_NEW_LEDS)
25 #include <linux/platform_device.h>
28 * New cross-platform LED support.
31 static struct gpio_led_platform_data led_data;
33 static struct platform_device at91_leds = {
36 .dev.platform_data = &led_data,
39 void __init at91_gpio_leds(struct gpio_led *leds, int nr)
46 for (i = 0; i < nr; i++)
47 at91_set_gpio_output(leds[i].gpio, leds[i].active_low);
50 led_data.num_leds = nr;
51 platform_device_register(&at91_leds);
55 void __init at91_gpio_leds(struct gpio_led *leds, int nr) {}
59 /* ------------------------------------------------------------------------- */
61 #if defined(CONFIG_LEDS)
66 * Old ARM-specific LED framework; not fully functional when generic time is
70 static u8 at91_leds_cpu;
71 static u8 at91_leds_timer;
73 static inline void at91_led_on(unsigned int led)
75 at91_set_gpio_value(led, 0);
78 static inline void at91_led_off(unsigned int led)
80 at91_set_gpio_value(led, 1);
83 static inline void at91_led_toggle(unsigned int led)
85 unsigned long is_off = at91_get_gpio_value(led);
96 static void at91_leds_event(led_event_t evt)
100 local_irq_save(flags);
103 case led_start: /* System startup */
104 at91_led_on(at91_leds_cpu);
107 case led_stop: /* System stop / suspend */
108 at91_led_off(at91_leds_cpu);
111 #ifdef CONFIG_LEDS_TIMER
112 case led_timer: /* Every 50 timer ticks */
113 at91_led_toggle(at91_leds_timer);
117 #ifdef CONFIG_LEDS_CPU
118 case led_idle_start: /* Entering idle state */
119 at91_led_off(at91_leds_cpu);
122 case led_idle_end: /* Exit idle state */
123 at91_led_on(at91_leds_cpu);
131 local_irq_restore(flags);
135 static int __init leds_init(void)
137 if (!at91_leds_timer || !at91_leds_cpu)
140 leds_event = at91_leds_event;
142 leds_event(led_start);
146 __initcall(leds_init);
149 void __init at91_init_leds(u8 cpu_led, u8 timer_led)
151 /* Enable GPIO to access the LEDs */
152 at91_set_gpio_output(cpu_led, 1);
153 at91_set_gpio_output(timer_led, 1);
155 at91_leds_cpu = cpu_led;
156 at91_leds_timer = timer_led;
160 void __init at91_init_leds(u8 cpu_led, u8 timer_led) {}