135 lines
2.6 KiB
C
135 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Bluetooth built-in chip control
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*
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* Copyright (c) 2008 Dmitry Baryshkov
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/delay.h>
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#include <linux/rfkill.h>
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#include "tosa_bt.h"
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static void tosa_bt_on(struct tosa_bt_data *data)
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{
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gpio_set_value(data->gpio_reset, 0);
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gpio_set_value(data->gpio_pwr, 1);
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gpio_set_value(data->gpio_reset, 1);
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mdelay(20);
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gpio_set_value(data->gpio_reset, 0);
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}
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static void tosa_bt_off(struct tosa_bt_data *data)
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{
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gpio_set_value(data->gpio_reset, 1);
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mdelay(10);
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gpio_set_value(data->gpio_pwr, 0);
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gpio_set_value(data->gpio_reset, 0);
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}
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static int tosa_bt_set_block(void *data, bool blocked)
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{
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pr_info("BT_RADIO going: %s\n", blocked ? "off" : "on");
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if (!blocked) {
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pr_info("TOSA_BT: going ON\n");
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tosa_bt_on(data);
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} else {
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pr_info("TOSA_BT: going OFF\n");
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tosa_bt_off(data);
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}
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return 0;
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}
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static const struct rfkill_ops tosa_bt_rfkill_ops = {
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.set_block = tosa_bt_set_block,
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};
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static int tosa_bt_probe(struct platform_device *dev)
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{
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int rc;
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struct rfkill *rfk;
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struct tosa_bt_data *data = dev->dev.platform_data;
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rc = gpio_request(data->gpio_reset, "Bluetooth reset");
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if (rc)
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goto err_reset;
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rc = gpio_direction_output(data->gpio_reset, 0);
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if (rc)
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goto err_reset_dir;
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rc = gpio_request(data->gpio_pwr, "Bluetooth power");
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if (rc)
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goto err_pwr;
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rc = gpio_direction_output(data->gpio_pwr, 0);
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if (rc)
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goto err_pwr_dir;
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rfk = rfkill_alloc("tosa-bt", &dev->dev, RFKILL_TYPE_BLUETOOTH,
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&tosa_bt_rfkill_ops, data);
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if (!rfk) {
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rc = -ENOMEM;
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goto err_rfk_alloc;
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}
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rc = rfkill_register(rfk);
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if (rc)
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goto err_rfkill;
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platform_set_drvdata(dev, rfk);
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return 0;
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err_rfkill:
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rfkill_destroy(rfk);
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err_rfk_alloc:
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tosa_bt_off(data);
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err_pwr_dir:
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gpio_free(data->gpio_pwr);
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err_pwr:
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err_reset_dir:
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gpio_free(data->gpio_reset);
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err_reset:
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return rc;
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}
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static int tosa_bt_remove(struct platform_device *dev)
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{
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struct tosa_bt_data *data = dev->dev.platform_data;
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struct rfkill *rfk = platform_get_drvdata(dev);
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platform_set_drvdata(dev, NULL);
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if (rfk) {
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rfkill_unregister(rfk);
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rfkill_destroy(rfk);
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}
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rfk = NULL;
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tosa_bt_off(data);
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gpio_free(data->gpio_pwr);
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gpio_free(data->gpio_reset);
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return 0;
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}
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static struct platform_driver tosa_bt_driver = {
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.probe = tosa_bt_probe,
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.remove = tosa_bt_remove,
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.driver = {
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.name = "tosa-bt",
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},
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};
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module_platform_driver(tosa_bt_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Dmitry Baryshkov");
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MODULE_DESCRIPTION("Bluetooth built-in chip control");
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