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leds.c

/*
 * 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 <linux/platform_device.h>

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


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

#if defined(CONFIG_NEW_LEDS)

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

static struct gpio_led_platform_data led_data;

static struct platform_device at91_gpio_leds_device = {
      .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_gpio_leds_device);
}

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


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

#if defined (CONFIG_LEDS_ATMEL_PWM)

/*
 * PWM Leds
 */

static struct gpio_led_platform_data pwm_led_data;

static struct platform_device at91_pwm_leds_device = {
      .name             = "leds-atmel-pwm",
      .id               = -1,
      .dev.platform_data      = &pwm_led_data,
};

void __init at91_pwm_leds(struct gpio_led *leds, int nr)
{
      int i;
      u32 pwm_mask = 0;

      if (!nr)
            return;

      for (i = 0; i < nr; i++)
            pwm_mask |= (1 << leds[i].gpio);

      pwm_led_data.leds = leds;
      pwm_led_data.num_leds = nr;

      at91_add_device_pwm(pwm_mask);
      platform_device_register(&at91_pwm_leds_device);
}
#else
void __init at91_pwm_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

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