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/*
* Toshiba Bluetooth Enable Driver
*
* Copyright (C) 2009 Jes Sorensen <Jes.Sorensen@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 <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
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, int type);
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);
static int toshiba_bt_resume(struct device *dev);
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_enable(acpi_handle handle)
{
acpi_status res1, res2;
u64 result;
/*
* Query ACPI to verify RFKill switch is set to 'on'.
* If not, we return silently, no need to report it as
* an error.
*/
res1 = acpi_evaluate_integer(handle, "BTST", NULL, &result);
if (ACPI_FAILURE(res1))
return res1;
if (!(result & 0x01))
return 0;
pr_info("Re-enabling Toshiba Bluetooth\n");
res1 = acpi_evaluate_object(handle, "AUSB", NULL, NULL);
res2 = acpi_evaluate_object(handle, "BTPO", NULL, NULL);
if (!ACPI_FAILURE(res1) || !ACPI_FAILURE(res2))
return 0;
pr_warn("Failed to re-enable Toshiba Bluetooth\n");
return -ENODEV;
}
static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event)
{
toshiba_bluetooth_enable(device->handle);
}
static int toshiba_bt_resume(struct device *dev)
{
return toshiba_bluetooth_enable(to_acpi_device(dev)->handle);
}
static int toshiba_bt_rfkill_add(struct acpi_device *device)
{
acpi_status status;
u64 bt_present;
int result = -ENODEV;
/*
* 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, before trying to enable it.
*/
status = acpi_evaluate_integer(device->handle, "_STA", NULL,
&bt_present);
if (!ACPI_FAILURE(status) && bt_present) {
pr_info("Detected Toshiba ACPI Bluetooth device - "
"installing RFKill handler\n");
result = toshiba_bluetooth_enable(device->handle);
}
return result;
}
static int __init toshiba_bt_rfkill_init(void)
{
int result;
result = acpi_bus_register_driver(&toshiba_bt_rfkill_driver);
if (result < 0) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error registering driver\n"));
return result;
}
return 0;
}
static int toshiba_bt_rfkill_remove(struct acpi_device *device, int type)
{
/* clean up */
return 0;
}
static void __exit toshiba_bt_rfkill_exit(void)
{
acpi_bus_unregister_driver(&toshiba_bt_rfkill_driver);
}
module_init(toshiba_bt_rfkill_init);
module_exit(toshiba_bt_rfkill_exit);
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