145 lines
3.8 KiB
C
145 lines
3.8 KiB
C
/*
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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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*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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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#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 <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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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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static int toshiba_bt_rfkill_add(struct acpi_device *device);
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static int toshiba_bt_rfkill_remove(struct acpi_device *device, int type);
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static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event);
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static int toshiba_bt_resume(struct acpi_device *device);
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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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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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.resume = toshiba_bt_resume,
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},
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.owner = THIS_MODULE,
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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 res1, res2;
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u64 result;
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/*
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* Query ACPI to verify RFKill switch is set to 'on'.
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* If not, we return silently, no need to report it as
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* an error.
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*/
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res1 = acpi_evaluate_integer(handle, "BTST", NULL, &result);
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if (ACPI_FAILURE(res1))
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return res1;
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if (!(result & 0x01))
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return 0;
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printk(KERN_INFO "toshiba_bluetooth: Re-enabling Toshiba Bluetooth\n");
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res1 = acpi_evaluate_object(handle, "AUSB", NULL, NULL);
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res2 = acpi_evaluate_object(handle, "BTPO", NULL, NULL);
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if (!ACPI_FAILURE(res1) || !ACPI_FAILURE(res2))
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return 0;
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printk(KERN_WARNING "toshiba_bluetooth: Failed to re-enable "
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"Toshiba Bluetooth\n");
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return -ENODEV;
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}
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static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event)
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{
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toshiba_bluetooth_enable(device->handle);
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}
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static int toshiba_bt_resume(struct acpi_device *device)
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{
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return toshiba_bluetooth_enable(device->handle);
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}
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static int toshiba_bt_rfkill_add(struct acpi_device *device)
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{
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acpi_status status;
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u64 bt_present;
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int result = -ENODEV;
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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, before trying to enable it.
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*/
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status = acpi_evaluate_integer(device->handle, "_STA", NULL,
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&bt_present);
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if (!ACPI_FAILURE(status) && bt_present) {
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printk(KERN_INFO "Detected Toshiba ACPI Bluetooth device - "
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"installing RFKill handler\n");
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result = toshiba_bluetooth_enable(device->handle);
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}
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return result;
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}
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static int __init toshiba_bt_rfkill_init(void)
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{
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int result;
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result = acpi_bus_register_driver(&toshiba_bt_rfkill_driver);
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if (result < 0) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Error registering driver\n"));
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return result;
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}
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return 0;
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}
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static int toshiba_bt_rfkill_remove(struct acpi_device *device, int type)
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{
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/* clean up */
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return 0;
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}
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static void __exit toshiba_bt_rfkill_exit(void)
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{
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acpi_bus_unregister_driver(&toshiba_bt_rfkill_driver);
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}
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module_init(toshiba_bt_rfkill_init);
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module_exit(toshiba_bt_rfkill_exit);
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