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/*
* Toshiba Bluetooth Enable Driver
*
* Copyright (C) 2009 Jes Sorensen <Jes.Sorensen@gmail.com>
* Copyright (C) 2015 Azael Avalos <coproscefalo@gmail.com>
*
* Thanks to Matthew Garrett for background info on ACPI innards which
* normal people aren't meant to understand :-)
*
* 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.
*
* Note the Toshiba Bluetooth RFKill switch seems to be a strange
* fish. It only provides a BT event when the switch is flipped to
* the 'on' position. When flipping it to 'off', the USB device is
* simply pulled away underneath us, without any BT event being
* delivered.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/acpi.h>
#define BT_KILLSWITCH_MASK 0x01
#define BT_PLUGGED_MASK 0x40
#define BT_POWER_MASK 0x80
MODULE_AUTHOR("Jes Sorensen <Jes.Sorensen@gmail.com>");
MODULE_DESCRIPTION("Toshiba Laptop ACPI Bluetooth Enable Driver");
MODULE_LICENSE("GPL");
static int toshiba_bt_rfkill_add(struct acpi_device *device);
static int toshiba_bt_rfkill_remove(struct acpi_device *device);
static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event);
static const struct acpi_device_id bt_device_ids[] = {
{ "TOS6205", 0},
{ "", 0},
};
MODULE_DEVICE_TABLE(acpi, bt_device_ids);
#ifdef CONFIG_PM_SLEEP
static int toshiba_bt_resume(struct device *dev);
#endif
static SIMPLE_DEV_PM_OPS(toshiba_bt_pm, NULL, toshiba_bt_resume);
static struct acpi_driver toshiba_bt_rfkill_driver = {
.name = "Toshiba BT",
.class = "Toshiba",
.ids = bt_device_ids,
.ops = {
.add = toshiba_bt_rfkill_add,
.remove = toshiba_bt_rfkill_remove,
.notify = toshiba_bt_rfkill_notify,
},
.owner = THIS_MODULE,
.drv.pm = &toshiba_bt_pm,
};
static int toshiba_bluetooth_present(acpi_handle handle)
{
acpi_status result;
u64 bt_present;
/*
* Some Toshiba laptops may have a fake TOS6205 device in
* their ACPI BIOS, so query the _STA method to see if there
* is really anything there.
*/
result = acpi_evaluate_integer(handle, "_STA", NULL, &bt_present);
if (ACPI_FAILURE(result)) {
pr_err("ACPI call to query Bluetooth presence failed");
return -ENXIO;
} else if (!bt_present) {
pr_info("Bluetooth device not present\n");
return -ENODEV;
}
return 0;
}
static int toshiba_bluetooth_status(acpi_handle handle)
{
acpi_status result;
u64 status;
result = acpi_evaluate_integer(handle, "BTST", NULL, &status);
if (ACPI_FAILURE(result)) {
pr_err("Could not get Bluetooth device status\n");
return -ENXIO;
}
pr_info("Bluetooth status %llu\n", status);
return status;
}
static int toshiba_bluetooth_enable(acpi_handle handle)
{
acpi_status result;
bool killswitch;
bool powered;
bool plugged;
int status;
/*
* Query ACPI to verify RFKill switch is set to 'on'.
* If not, we return silently, no need to report it as
* an error.
*/
status = toshiba_bluetooth_status(handle);
if (status < 0)
return status;
killswitch = (status & BT_KILLSWITCH_MASK) ? true : false;
powered = (status & BT_POWER_MASK) ? true : false;
plugged = (status & BT_PLUGGED_MASK) ? true : false;
if (!killswitch)
return 0;
/*
* This check ensures to only enable the device if it is powered
* off or detached, as some recent devices somehow pass the killswitch
* test, causing a loop enabling/disabling the device, see bug 93911.
*/
if (powered || plugged)
return 0;
result = acpi_evaluate_object(handle, "AUSB", NULL, NULL);
if (ACPI_FAILURE(result)) {
pr_err("Could not attach USB Bluetooth device\n");
return -ENXIO;
}
result = acpi_evaluate_object(handle, "BTPO", NULL, NULL);
if (ACPI_FAILURE(result)) {
pr_err("Could not power ON Bluetooth device\n");
return -ENXIO;
}
return 0;
}
static int toshiba_bluetooth_disable(acpi_handle handle)
{
acpi_status result;
result = acpi_evaluate_object(handle, "BTPF", NULL, NULL);
if (ACPI_FAILURE(result)) {
pr_err("Could not power OFF Bluetooth device\n");
return -ENXIO;
}
result = acpi_evaluate_object(handle, "DUSB", NULL, NULL);
if (ACPI_FAILURE(result)) {
pr_err("Could not detach USB Bluetooth device\n");
return -ENXIO;
}
return 0;
}
static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event)
{
toshiba_bluetooth_enable(device->handle);
}
#ifdef CONFIG_PM_SLEEP
static int toshiba_bt_resume(struct device *dev)
{
return toshiba_bluetooth_enable(to_acpi_device(dev)->handle);
}
#endif
static int toshiba_bt_rfkill_add(struct acpi_device *device)
{
int result;
result = toshiba_bluetooth_present(device->handle);
if (result)
return result;
pr_info("Toshiba ACPI Bluetooth device driver\n");
/* Enable the BT device */
result = toshiba_bluetooth_enable(device->handle);
if (result)
return result;
return result;
}
static int toshiba_bt_rfkill_remove(struct acpi_device *device)
{
/* clean up */
return toshiba_bluetooth_disable(device->handle);
}
module_acpi_driver(toshiba_bt_rfkill_driver);
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