298 lines
6.8 KiB
C
298 lines
6.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Toshiba Bluetooth Enable Driver
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*
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* Copyright (C) 2009 Jes Sorensen <Jes.Sorensen@gmail.com>
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* Copyright (C) 2015 Azael Avalos <coproscefalo@gmail.com>
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*
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* Thanks to Matthew Garrett for background info on ACPI innards which
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* normal people aren't meant to understand :-)
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/acpi.h>
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#include <linux/rfkill.h>
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#define BT_KILLSWITCH_MASK 0x01
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#define BT_PLUGGED_MASK 0x40
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#define BT_POWER_MASK 0x80
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MODULE_AUTHOR("Jes Sorensen <Jes.Sorensen@gmail.com>");
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MODULE_DESCRIPTION("Toshiba Laptop ACPI Bluetooth Enable Driver");
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MODULE_LICENSE("GPL");
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struct toshiba_bluetooth_dev {
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struct acpi_device *acpi_dev;
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struct rfkill *rfk;
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bool killswitch;
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bool plugged;
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bool powered;
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};
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static int toshiba_bt_rfkill_add(struct acpi_device *device);
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static int toshiba_bt_rfkill_remove(struct acpi_device *device);
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static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event);
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static const struct acpi_device_id bt_device_ids[] = {
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{ "TOS6205", 0},
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{ "", 0},
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};
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MODULE_DEVICE_TABLE(acpi, bt_device_ids);
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#ifdef CONFIG_PM_SLEEP
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static int toshiba_bt_resume(struct device *dev);
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#endif
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static SIMPLE_DEV_PM_OPS(toshiba_bt_pm, NULL, toshiba_bt_resume);
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static struct acpi_driver toshiba_bt_rfkill_driver = {
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.name = "Toshiba BT",
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.class = "Toshiba",
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.ids = bt_device_ids,
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.ops = {
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.add = toshiba_bt_rfkill_add,
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.remove = toshiba_bt_rfkill_remove,
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.notify = toshiba_bt_rfkill_notify,
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},
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.owner = THIS_MODULE,
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.drv.pm = &toshiba_bt_pm,
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};
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static int toshiba_bluetooth_present(acpi_handle handle)
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{
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acpi_status result;
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u64 bt_present;
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/*
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* Some Toshiba laptops may have a fake TOS6205 device in
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* their ACPI BIOS, so query the _STA method to see if there
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* is really anything there.
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*/
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result = acpi_evaluate_integer(handle, "_STA", NULL, &bt_present);
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if (ACPI_FAILURE(result)) {
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pr_err("ACPI call to query Bluetooth presence failed\n");
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return -ENXIO;
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}
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if (!bt_present) {
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pr_info("Bluetooth device not present\n");
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return -ENODEV;
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}
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return 0;
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}
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static int toshiba_bluetooth_status(acpi_handle handle)
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{
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acpi_status result;
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u64 status;
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result = acpi_evaluate_integer(handle, "BTST", NULL, &status);
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if (ACPI_FAILURE(result)) {
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pr_err("Could not get Bluetooth device status\n");
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return -ENXIO;
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}
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return status;
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}
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static int toshiba_bluetooth_enable(acpi_handle handle)
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{
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acpi_status result;
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result = acpi_evaluate_object(handle, "AUSB", NULL, NULL);
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if (ACPI_FAILURE(result)) {
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pr_err("Could not attach USB Bluetooth device\n");
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return -ENXIO;
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}
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result = acpi_evaluate_object(handle, "BTPO", NULL, NULL);
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if (ACPI_FAILURE(result)) {
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pr_err("Could not power ON Bluetooth device\n");
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return -ENXIO;
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}
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return 0;
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}
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static int toshiba_bluetooth_disable(acpi_handle handle)
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{
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acpi_status result;
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result = acpi_evaluate_object(handle, "BTPF", NULL, NULL);
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if (ACPI_FAILURE(result)) {
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pr_err("Could not power OFF Bluetooth device\n");
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return -ENXIO;
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}
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result = acpi_evaluate_object(handle, "DUSB", NULL, NULL);
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if (ACPI_FAILURE(result)) {
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pr_err("Could not detach USB Bluetooth device\n");
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return -ENXIO;
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}
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return 0;
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}
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/* Helper function */
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static int toshiba_bluetooth_sync_status(struct toshiba_bluetooth_dev *bt_dev)
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{
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int status;
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status = toshiba_bluetooth_status(bt_dev->acpi_dev->handle);
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if (status < 0) {
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pr_err("Could not sync bluetooth device status\n");
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return status;
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}
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bt_dev->killswitch = (status & BT_KILLSWITCH_MASK) ? true : false;
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bt_dev->plugged = (status & BT_PLUGGED_MASK) ? true : false;
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bt_dev->powered = (status & BT_POWER_MASK) ? true : false;
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pr_debug("Bluetooth status %d killswitch %d plugged %d powered %d\n",
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status, bt_dev->killswitch, bt_dev->plugged, bt_dev->powered);
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return 0;
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}
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/* RFKill handlers */
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static int bt_rfkill_set_block(void *data, bool blocked)
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{
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struct toshiba_bluetooth_dev *bt_dev = data;
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int ret;
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ret = toshiba_bluetooth_sync_status(bt_dev);
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if (ret)
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return ret;
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if (!bt_dev->killswitch)
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return 0;
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if (blocked)
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ret = toshiba_bluetooth_disable(bt_dev->acpi_dev->handle);
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else
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ret = toshiba_bluetooth_enable(bt_dev->acpi_dev->handle);
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return ret;
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}
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static void bt_rfkill_poll(struct rfkill *rfkill, void *data)
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{
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struct toshiba_bluetooth_dev *bt_dev = data;
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if (toshiba_bluetooth_sync_status(bt_dev))
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return;
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/*
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* Note the Toshiba Bluetooth RFKill switch seems to be a strange
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* fish. It only provides a BT event when the switch is flipped to
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* the 'on' position. When flipping it to 'off', the USB device is
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* simply pulled away underneath us, without any BT event being
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* delivered.
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*/
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rfkill_set_hw_state(bt_dev->rfk, !bt_dev->killswitch);
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}
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static const struct rfkill_ops rfk_ops = {
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.set_block = bt_rfkill_set_block,
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.poll = bt_rfkill_poll,
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};
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/* ACPI driver functions */
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static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event)
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{
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struct toshiba_bluetooth_dev *bt_dev = acpi_driver_data(device);
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if (toshiba_bluetooth_sync_status(bt_dev))
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return;
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rfkill_set_hw_state(bt_dev->rfk, !bt_dev->killswitch);
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}
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#ifdef CONFIG_PM_SLEEP
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static int toshiba_bt_resume(struct device *dev)
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{
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struct toshiba_bluetooth_dev *bt_dev;
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int ret;
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bt_dev = acpi_driver_data(to_acpi_device(dev));
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ret = toshiba_bluetooth_sync_status(bt_dev);
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if (ret)
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return ret;
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rfkill_set_hw_state(bt_dev->rfk, !bt_dev->killswitch);
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return 0;
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}
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#endif
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static int toshiba_bt_rfkill_add(struct acpi_device *device)
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{
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struct toshiba_bluetooth_dev *bt_dev;
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int result;
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result = toshiba_bluetooth_present(device->handle);
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if (result)
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return result;
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pr_info("Toshiba ACPI Bluetooth device driver\n");
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bt_dev = kzalloc(sizeof(*bt_dev), GFP_KERNEL);
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if (!bt_dev)
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return -ENOMEM;
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bt_dev->acpi_dev = device;
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device->driver_data = bt_dev;
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dev_set_drvdata(&device->dev, bt_dev);
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result = toshiba_bluetooth_sync_status(bt_dev);
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if (result) {
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kfree(bt_dev);
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return result;
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}
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bt_dev->rfk = rfkill_alloc("Toshiba Bluetooth",
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&device->dev,
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RFKILL_TYPE_BLUETOOTH,
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&rfk_ops,
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bt_dev);
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if (!bt_dev->rfk) {
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pr_err("Unable to allocate rfkill device\n");
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kfree(bt_dev);
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return -ENOMEM;
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}
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rfkill_set_hw_state(bt_dev->rfk, !bt_dev->killswitch);
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result = rfkill_register(bt_dev->rfk);
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if (result) {
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pr_err("Unable to register rfkill device\n");
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rfkill_destroy(bt_dev->rfk);
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kfree(bt_dev);
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}
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return result;
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}
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static int toshiba_bt_rfkill_remove(struct acpi_device *device)
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{
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struct toshiba_bluetooth_dev *bt_dev = acpi_driver_data(device);
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/* clean up */
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if (bt_dev->rfk) {
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rfkill_unregister(bt_dev->rfk);
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rfkill_destroy(bt_dev->rfk);
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}
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kfree(bt_dev);
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return toshiba_bluetooth_disable(device->handle);
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}
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module_acpi_driver(toshiba_bt_rfkill_driver);
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