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// SPDX-License-Identifier: GPL-2.0-only
/*
* Bluetooth built-in chip control
*
* Copyright (c) 2008 Dmitry Baryshkov
*/
#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 "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 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 = tosa_bt_remove,
.driver = {
.name = "tosa-bt",
},
};
module_platform_driver(tosa_bt_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Dmitry Baryshkov");
MODULE_DESCRIPTION("Bluetooth built-in chip control");
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