1/* 2 * Toshiba Bluetooth Enable Driver 3 * 4 * Copyright (C) 2009 Jes Sorensen <Jes.Sorensen@gmail.com> 5 * 6 * Thanks to Matthew Garrett for background info on ACPI innards which 7 * normal people aren't meant to understand :-) 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 * 13 * Note the Toshiba Bluetooth RFKill switch seems to be a strange 14 * fish. It only provides a BT event when the switch is flipped to 15 * the 'on' position. When flipping it to 'off', the USB device is 16 * simply pulled away underneath us, without any BT event being 17 * delivered. 18 */ 19 20#include <linux/kernel.h> 21#include <linux/module.h> 22#include <linux/init.h> 23#include <linux/types.h> 24#include <acpi/acpi_bus.h> 25#include <acpi/acpi_drivers.h> 26 27MODULE_AUTHOR("Jes Sorensen <Jes.Sorensen@gmail.com>"); 28MODULE_DESCRIPTION("Toshiba Laptop ACPI Bluetooth Enable Driver"); 29MODULE_LICENSE("GPL"); 30 31 32static int toshiba_bt_rfkill_add(struct acpi_device *device); 33static int toshiba_bt_rfkill_remove(struct acpi_device *device, int type); 34static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event); 35static int toshiba_bt_resume(struct acpi_device *device); 36 37static const struct acpi_device_id bt_device_ids[] = { 38 { "TOS6205", 0}, 39 { "", 0}, 40}; 41MODULE_DEVICE_TABLE(acpi, bt_device_ids); 42 43static struct acpi_driver toshiba_bt_rfkill_driver = { 44 .name = "Toshiba BT", 45 .class = "Toshiba", 46 .ids = bt_device_ids, 47 .ops = { 48 .add = toshiba_bt_rfkill_add, 49 .remove = toshiba_bt_rfkill_remove, 50 .notify = toshiba_bt_rfkill_notify, 51 .resume = toshiba_bt_resume, 52 }, 53 .owner = THIS_MODULE, 54}; 55 56 57static int toshiba_bluetooth_enable(acpi_handle handle) 58{ 59 acpi_status res1, res2; 60 u64 result; 61 62 /* 63 * Query ACPI to verify RFKill switch is set to 'on'. 64 * If not, we return silently, no need to report it as 65 * an error. 66 */ 67 res1 = acpi_evaluate_integer(handle, "BTST", NULL, &result); 68 if (ACPI_FAILURE(res1)) 69 return res1; 70 if (!(result & 0x01)) 71 return 0; 72 73 printk(KERN_INFO "toshiba_bluetooth: Re-enabling Toshiba Bluetooth\n"); 74 res1 = acpi_evaluate_object(handle, "AUSB", NULL, NULL); 75 res2 = acpi_evaluate_object(handle, "BTPO", NULL, NULL); 76 if (!ACPI_FAILURE(res1) || !ACPI_FAILURE(res2)) 77 return 0; 78 79 printk(KERN_WARNING "toshiba_bluetooth: Failed to re-enable " 80 "Toshiba Bluetooth\n"); 81 82 return -ENODEV; 83} 84 85static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event) 86{ 87 toshiba_bluetooth_enable(device->handle); 88} 89 90static int toshiba_bt_resume(struct acpi_device *device) 91{ 92 return toshiba_bluetooth_enable(device->handle); 93} 94 95static int toshiba_bt_rfkill_add(struct acpi_device *device) 96{ 97 acpi_status status; 98 u64 bt_present; 99 int result = -ENODEV; 100 101 /* 102 * Some Toshiba laptops may have a fake TOS6205 device in 103 * their ACPI BIOS, so query the _STA method to see if there 104 * is really anything there, before trying to enable it. 105 */ 106 status = acpi_evaluate_integer(device->handle, "_STA", NULL, 107 &bt_present); 108 109 if (!ACPI_FAILURE(status) && bt_present) { 110 printk(KERN_INFO "Detected Toshiba ACPI Bluetooth device - " 111 "installing RFKill handler\n"); 112 result = toshiba_bluetooth_enable(device->handle); 113 } 114 115 return result; 116} 117 118static int __init toshiba_bt_rfkill_init(void) 119{ 120 int result; 121 122 result = acpi_bus_register_driver(&toshiba_bt_rfkill_driver); 123 if (result < 0) { 124 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 125 "Error registering driver\n")); 126 return result; 127 } 128 129 return 0; 130} 131 132static int toshiba_bt_rfkill_remove(struct acpi_device *device, int type) 133{ 134 /* clean up */ 135 return 0; 136} 137 138static void __exit toshiba_bt_rfkill_exit(void) 139{ 140 acpi_bus_unregister_driver(&toshiba_bt_rfkill_driver); 141} 142 143module_init(toshiba_bt_rfkill_init); 144module_exit(toshiba_bt_rfkill_exit); 145