tosa-bt.c

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/*
 * 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_set_block(void *data, bool blocked)
{
    pr_info("BT_RADIO going: %s\n", blocked ? "off" : "on");

    if (!blocked) {
        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 const struct rfkill_ops tosa_bt_rfkill_ops = {
    .set_block = tosa_bt_set_block,
};

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_alloc("tosa-bt", &dev->dev, RFKILL_TYPE_BLUETOOTH,
               &tosa_bt_rfkill_ops, data);
    if (!rfk) {
        rc = -ENOMEM;
        goto err_rfk_alloc;
    }

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

    platform_set_drvdata(dev, rfk);

    return 0;

err_rfkill:
    rfkill_destroy(rfk);
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);
        rfkill_destroy(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);