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tosa-bt.c

/*
 * Bluetooth built-in chip control
 *
 * Copyright (c) 2008 Dmitry Baryshkov
 *
 * 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/module.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/rfkill.h>

#include <mach/tosa_bt.h>

static void tosa_bt_on(struct tosa_bt_data *data)
{
      gpio_set_value(data->gpio_reset, 0);
      gpio_set_value(data->gpio_pwr, 1);
      gpio_set_value(data->gpio_reset, 1);
      mdelay(20);
      gpio_set_value(data->gpio_reset, 0);
}

static void tosa_bt_off(struct tosa_bt_data *data)
{
      gpio_set_value(data->gpio_reset, 1);
      mdelay(10);
      gpio_set_value(data->gpio_pwr, 0);
      gpio_set_value(data->gpio_reset, 0);
}

static int tosa_bt_toggle_radio(void *data, enum rfkill_state state)
{
      pr_info("BT_RADIO going: %s\n",
                  state == RFKILL_STATE_ON ? "on" : "off");

      if (state == RFKILL_STATE_ON) {
            pr_info("TOSA_BT: going ON\n");
            tosa_bt_on(data);
      } else {
            pr_info("TOSA_BT: going OFF\n");
            tosa_bt_off(data);
      }
      return 0;
}

static int tosa_bt_probe(struct platform_device *dev)
{
      int rc;
      struct rfkill *rfk;

      struct tosa_bt_data *data = dev->dev.platform_data;

      rc = gpio_request(data->gpio_reset, "Bluetooth reset");
      if (rc)
            goto err_reset;
      rc = gpio_direction_output(data->gpio_reset, 0);
      if (rc)
            goto err_reset_dir;
      rc = gpio_request(data->gpio_pwr, "Bluetooth power");
      if (rc)
            goto err_pwr;
      rc = gpio_direction_output(data->gpio_pwr, 0);
      if (rc)
            goto err_pwr_dir;

      rfk = rfkill_allocate(&dev->dev, RFKILL_TYPE_BLUETOOTH);
      if (!rfk) {
            rc = -ENOMEM;
            goto err_rfk_alloc;
      }

      rfk->name = "tosa-bt";
      rfk->toggle_radio = tosa_bt_toggle_radio;
      rfk->data = data;
#ifdef CONFIG_RFKILL_LEDS
      rfk->led_trigger.name = "tosa-bt";
#endif

      rc = rfkill_register(rfk);
      if (rc)
            goto err_rfkill;

      platform_set_drvdata(dev, rfk);

      return 0;

err_rfkill:
      if (rfk)
            rfkill_free(rfk);
      rfk = NULL;
err_rfk_alloc:
      tosa_bt_off(data);
err_pwr_dir:
      gpio_free(data->gpio_pwr);
err_pwr:
err_reset_dir:
      gpio_free(data->gpio_reset);
err_reset:
      return rc;
}

static int __devexit tosa_bt_remove(struct platform_device *dev)
{
      struct tosa_bt_data *data = dev->dev.platform_data;
      struct rfkill *rfk = platform_get_drvdata(dev);

      platform_set_drvdata(dev, NULL);

      if (rfk)
            rfkill_unregister(rfk);
      rfk = NULL;

      tosa_bt_off(data);

      gpio_free(data->gpio_pwr);
      gpio_free(data->gpio_reset);

      return 0;
}

static struct platform_driver tosa_bt_driver = {
      .probe = tosa_bt_probe,
      .remove = __devexit_p(tosa_bt_remove),

      .driver = {
            .name = "tosa-bt",
            .owner = THIS_MODULE,
      },
};


static int __init tosa_bt_init(void)
{
      return platform_driver_register(&tosa_bt_driver);
}

static void __exit tosa_bt_exit(void)
{
      platform_driver_unregister(&tosa_bt_driver);
}

module_init(tosa_bt_init);
module_exit(tosa_bt_exit);

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