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
27 MODULE_AUTHOR("Jes Sorensen <Jes.Sorensen@gmail.com>");
28 MODULE_DESCRIPTION("Toshiba Laptop ACPI Bluetooth Enable Driver");
29 MODULE_LICENSE("GPL");
30
31
32 static int toshiba_bt_rfkill_add(struct acpi_device *device);
33 static int toshiba_bt_rfkill_remove(struct acpi_device *device, int type);
34 static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event);
35 static int toshiba_bt_resume(struct acpi_device *device);
36
37 static const struct acpi_device_id bt_device_ids[] = {
38 { "TOS6205", 0},
39 { "", 0},
40 };
41 MODULE_DEVICE_TABLE(acpi, bt_device_ids);
42
43 static 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
toshiba_bluetooth_enable(acpi_handle handle)57 static 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
toshiba_bt_rfkill_notify(struct acpi_device * device,u32 event)85 static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event)
86 {
87 toshiba_bluetooth_enable(device->handle);
88 }
89
toshiba_bt_resume(struct acpi_device * device)90 static int toshiba_bt_resume(struct acpi_device *device)
91 {
92 return toshiba_bluetooth_enable(device->handle);
93 }
94
toshiba_bt_rfkill_add(struct acpi_device * device)95 static 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
toshiba_bt_rfkill_init(void)118 static 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
toshiba_bt_rfkill_remove(struct acpi_device * device,int type)132 static int toshiba_bt_rfkill_remove(struct acpi_device *device, int type)
133 {
134 /* clean up */
135 return 0;
136 }
137
toshiba_bt_rfkill_exit(void)138 static void __exit toshiba_bt_rfkill_exit(void)
139 {
140 acpi_bus_unregister_driver(&toshiba_bt_rfkill_driver);
141 }
142
143 module_init(toshiba_bt_rfkill_init);
144 module_exit(toshiba_bt_rfkill_exit);
145