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leds.c

/*
 * Driver for the 8 user LEDs found on the RealViews and Versatiles
 * Based on DaVinci's DM365 board code
 *
 * License terms: GNU General Public License (GPL) version 2
 * Author: Linus Walleij <triad@df.lth.se>
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/leds.h>

#include <mach/hardware.h>
#include <mach/platform.h>

#ifdef VERSATILE_SYS_BASE
#define LEDREG    (__io_address(VERSATILE_SYS_BASE) + VERSATILE_SYS_LED_OFFSET)
#endif

#ifdef REALVIEW_SYS_BASE
#define LEDREG    (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_LED_OFFSET)
#endif

00025 struct versatile_led {
      struct led_classdev     cdev;
      u8                mask;
};

/*
 * The triggers lines up below will only be used if the
 * LED triggers are compiled in.
 */
static const struct {
      const char *name;
      const char *trigger;
} versatile_leds[] = {
      { "versatile:0", "heartbeat", },
      { "versatile:1", "mmc0", },
      { "versatile:2", },
      { "versatile:3", },
      { "versatile:4", },
      { "versatile:5", },
      { "versatile:6", },
      { "versatile:7", },
};

static void versatile_led_set(struct led_classdev *cdev,
                        enum led_brightness b)
{
      struct versatile_led *led = container_of(cdev,
                                     struct versatile_led, cdev);
      u32 reg = readl(LEDREG);

      if (b != LED_OFF)
            reg |= led->mask;
      else
            reg &= ~led->mask;
      writel(reg, LEDREG);
}

static enum led_brightness versatile_led_get(struct led_classdev *cdev)
{
      struct versatile_led *led = container_of(cdev,
                                     struct versatile_led, cdev);
      u32 reg = readl(LEDREG);

      return (reg & led->mask) ? LED_FULL : LED_OFF;
}

static int __init versatile_leds_init(void)
{
      int i;

      /* All ON */
      writel(0xff, LEDREG);
      for (i = 0; i < ARRAY_SIZE(versatile_leds); i++) {
            struct versatile_led *led;

            led = kzalloc(sizeof(*led), GFP_KERNEL);
            if (!led)
                  break;

            led->cdev.name = versatile_leds[i].name;
            led->cdev.brightness_set = versatile_led_set;
            led->cdev.brightness_get = versatile_led_get;
            led->cdev.default_trigger = versatile_leds[i].trigger;
            led->mask = BIT(i);

            if (led_classdev_register(NULL, &led->cdev) < 0) {
                  kfree(led);
                  break;
            }
      }

      return 0;
}

/*
 * Since we may have triggers on any subsystem, defer registration
 * until after subsystem_init.
 */
fs_initcall(versatile_leds_init);

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