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leds-ams-delta.c

/*
 * LEDs driver for Amstrad Delta (E3)
 *
 * Copyright (C) 2006 Jonathan McDowell <noodles@earth.li>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <asm/arch/board-ams-delta.h>

/*
 * Our context
 */
struct ams_delta_led {
      struct led_classdev     cdev;
      u8                bitmask;
};

static void ams_delta_led_set(struct led_classdev *led_cdev,
            enum led_brightness value)
{
      struct ams_delta_led *led_dev =
            container_of(led_cdev, struct ams_delta_led, cdev);

      if (value)
            ams_delta_latch1_write(led_dev->bitmask, led_dev->bitmask);
      else
            ams_delta_latch1_write(led_dev->bitmask, 0);
}

static struct ams_delta_led ams_delta_leds[] = {
      {
            .cdev       = {
                  .name       = "ams-delta:camera",
                  .brightness_set = ams_delta_led_set,
            },
            .bitmask    = AMS_DELTA_LATCH1_LED_CAMERA,
      },
      {
            .cdev       = {
                  .name       = "ams-delta:advert",
                  .brightness_set = ams_delta_led_set,
            },
            .bitmask    = AMS_DELTA_LATCH1_LED_ADVERT,
      },
      {
            .cdev       = {
                  .name       = "ams-delta:email",
                  .brightness_set = ams_delta_led_set,
            },
            .bitmask    = AMS_DELTA_LATCH1_LED_EMAIL,
      },
      {
            .cdev       = {
                  .name       = "ams-delta:handsfree",
                  .brightness_set = ams_delta_led_set,
            },
            .bitmask    = AMS_DELTA_LATCH1_LED_HANDSFREE,
      },
      {
            .cdev       = {
                  .name       = "ams-delta:voicemail",
                  .brightness_set = ams_delta_led_set,
            },
            .bitmask    = AMS_DELTA_LATCH1_LED_VOICEMAIL,
      },
      {
            .cdev       = {
                  .name       = "ams-delta:voice",
                  .brightness_set = ams_delta_led_set,
            },
            .bitmask    = AMS_DELTA_LATCH1_LED_VOICE,
      },
};

#ifdef CONFIG_PM
static int ams_delta_led_suspend(struct platform_device *dev,
            pm_message_t state)
{
      int i;

      for (i = 0; i < ARRAY_SIZE(ams_delta_leds); i++)
            led_classdev_suspend(&ams_delta_leds[i].cdev);

      return 0;
}

static int ams_delta_led_resume(struct platform_device *dev)
{
      int i;

      for (i = 0; i < ARRAY_SIZE(ams_delta_leds); i++)
            led_classdev_resume(&ams_delta_leds[i].cdev);

      return 0;
}
#else
#define ams_delta_led_suspend NULL
#define ams_delta_led_resume NULL
#endif

static int ams_delta_led_probe(struct platform_device *pdev)
{
      int i;
      int ret;

      for (i = ret = 0; ret >= 0 && i < ARRAY_SIZE(ams_delta_leds); i++) {
            ret = led_classdev_register(&pdev->dev,
                        &ams_delta_leds[i].cdev);
      }

      if (ret < 0 && i > 1) {
            for (i = i - 2; i >= 0; i--)
                  led_classdev_unregister(&ams_delta_leds[i].cdev);
      }

      return ret;
}

static int ams_delta_led_remove(struct platform_device *pdev)
{
      int i;

      for (i = ARRAY_SIZE(ams_delta_leds) - 1; i >= 0; i--)
            led_classdev_unregister(&ams_delta_leds[i].cdev);

      return 0;
}

static struct platform_driver ams_delta_led_driver = {
      .probe            = ams_delta_led_probe,
      .remove           = ams_delta_led_remove,
      .suspend    = ams_delta_led_suspend,
      .resume           = ams_delta_led_resume,
      .driver           = {
            .name = "ams-delta-led",
      },
};

static int __init ams_delta_led_init(void)
{
      return platform_driver_register(&ams_delta_led_driver);
}

static void __exit ams_delta_led_exit(void)
{
      return platform_driver_unregister(&ams_delta_led_driver);
}

module_init(ams_delta_led_init);
module_exit(ams_delta_led_exit);

MODULE_AUTHOR("Jonathan McDowell <noodles@earth.li>");
MODULE_DESCRIPTION("Amstrad Delta LED driver");
MODULE_LICENSE("GPL");

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