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>
15 #include <linux/platform_device.h>
17 #include <mach/board.h>
18 #include <mach/gpio.h>
21 /* ------------------------------------------------------------------------- */
23 #if defined(CONFIG_NEW_LEDS)
26 * New cross-platform LED support.
29 static struct gpio_led_platform_data led_data;
31 static struct platform_device at91_gpio_leds_device = {
34 .dev.platform_data = &led_data,
37 void __init at91_gpio_leds(struct gpio_led *leds, int nr)
44 for (i = 0; i < nr; i++)
45 at91_set_gpio_output(leds[i].gpio, leds[i].active_low);
48 led_data.num_leds = nr;
49 platform_device_register(&at91_gpio_leds_device);
53 void __init at91_gpio_leds(struct gpio_led *leds, int nr) {}
57 /* ------------------------------------------------------------------------- */
59 #if defined (CONFIG_LEDS_ATMEL_PWM)
65 static struct gpio_led_platform_data pwm_led_data;
67 static struct platform_device at91_pwm_leds_device = {
68 .name = "leds-atmel-pwm",
70 .dev.platform_data = &pwm_led_data,
73 void __init at91_pwm_leds(struct gpio_led *leds, int nr)
81 for (i = 0; i < nr; i++)
82 pwm_mask |= (1 << leds[i].gpio);
84 pwm_led_data.leds = leds;
85 pwm_led_data.num_leds = nr;
87 at91_add_device_pwm(pwm_mask);
88 platform_device_register(&at91_pwm_leds_device);
91 void __init at91_pwm_leds(struct gpio_led *leds, int nr){}
95 /* ------------------------------------------------------------------------- */
97 #if defined(CONFIG_LEDS)
102 * Old ARM-specific LED framework; not fully functional when generic time is
106 static u8 at91_leds_cpu;
107 static u8 at91_leds_timer;
109 static inline void at91_led_on(unsigned int led)
111 at91_set_gpio_value(led, 0);
114 static inline void at91_led_off(unsigned int led)
116 at91_set_gpio_value(led, 1);
119 static inline void at91_led_toggle(unsigned int led)
121 unsigned long is_off = at91_get_gpio_value(led);
132 static void at91_leds_event(led_event_t evt)
136 local_irq_save(flags);
139 case led_start: /* System startup */
140 at91_led_on(at91_leds_cpu);
143 case led_stop: /* System stop / suspend */
144 at91_led_off(at91_leds_cpu);
147 #ifdef CONFIG_LEDS_TIMER
148 case led_timer: /* Every 50 timer ticks */
149 at91_led_toggle(at91_leds_timer);
153 #ifdef CONFIG_LEDS_CPU
154 case led_idle_start: /* Entering idle state */
155 at91_led_off(at91_leds_cpu);
158 case led_idle_end: /* Exit idle state */
159 at91_led_on(at91_leds_cpu);
167 local_irq_restore(flags);
171 static int __init leds_init(void)
173 if (!at91_leds_timer || !at91_leds_cpu)
176 leds_event = at91_leds_event;
178 leds_event(led_start);
182 __initcall(leds_init);
185 void __init at91_init_leds(u8 cpu_led, u8 timer_led)
187 /* Enable GPIO to access the LEDs */
188 at91_set_gpio_output(cpu_led, 1);
189 at91_set_gpio_output(timer_led, 1);
191 at91_leds_cpu = cpu_led;
192 at91_leds_timer = timer_led;
196 void __init at91_init_leds(u8 cpu_led, u8 timer_led) {}