1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Toshiba Bluetooth Enable Driver
4 *
5 * Copyright (C) 2009 Jes Sorensen <Jes.Sorensen@gmail.com>
6 * Copyright (C) 2015 Azael Avalos <coproscefalo@gmail.com>
7 *
8 * Thanks to Matthew Garrett for background info on ACPI innards which
9 * normal people aren't meant to understand :-)
10 */
11
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/types.h>
18 #include <linux/acpi.h>
19 #include <linux/rfkill.h>
20
21 #define BT_KILLSWITCH_MASK 0x01
22 #define BT_PLUGGED_MASK 0x40
23 #define BT_POWER_MASK 0x80
24
25 MODULE_AUTHOR("Jes Sorensen <Jes.Sorensen@gmail.com>");
26 MODULE_DESCRIPTION("Toshiba Laptop ACPI Bluetooth Enable Driver");
27 MODULE_LICENSE("GPL");
28
29 struct toshiba_bluetooth_dev {
30 struct acpi_device *acpi_dev;
31 struct rfkill *rfk;
32
33 bool killswitch;
34 bool plugged;
35 bool powered;
36 };
37
38 static int toshiba_bt_rfkill_add(struct acpi_device *device);
39 static void toshiba_bt_rfkill_remove(struct acpi_device *device);
40 static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event);
41
42 static const struct acpi_device_id bt_device_ids[] = {
43 { "TOS6205", 0},
44 { "", 0},
45 };
46 MODULE_DEVICE_TABLE(acpi, bt_device_ids);
47
48 #ifdef CONFIG_PM_SLEEP
49 static int toshiba_bt_resume(struct device *dev);
50 #endif
51 static SIMPLE_DEV_PM_OPS(toshiba_bt_pm, NULL, toshiba_bt_resume);
52
53 static struct acpi_driver toshiba_bt_rfkill_driver = {
54 .name = "Toshiba BT",
55 .class = "Toshiba",
56 .ids = bt_device_ids,
57 .ops = {
58 .add = toshiba_bt_rfkill_add,
59 .remove = toshiba_bt_rfkill_remove,
60 .notify = toshiba_bt_rfkill_notify,
61 },
62 .drv.pm = &toshiba_bt_pm,
63 };
64
toshiba_bluetooth_present(acpi_handle handle)65 static int toshiba_bluetooth_present(acpi_handle handle)
66 {
67 acpi_status result;
68 u64 bt_present;
69
70 /*
71 * Some Toshiba laptops may have a fake TOS6205 device in
72 * their ACPI BIOS, so query the _STA method to see if there
73 * is really anything there.
74 */
75 result = acpi_evaluate_integer(handle, "_STA", NULL, &bt_present);
76 if (ACPI_FAILURE(result)) {
77 pr_err("ACPI call to query Bluetooth presence failed\n");
78 return -ENXIO;
79 }
80
81 if (!bt_present) {
82 pr_info("Bluetooth device not present\n");
83 return -ENODEV;
84 }
85
86 return 0;
87 }
88
toshiba_bluetooth_status(acpi_handle handle)89 static int toshiba_bluetooth_status(acpi_handle handle)
90 {
91 acpi_status result;
92 u64 status;
93
94 result = acpi_evaluate_integer(handle, "BTST", NULL, &status);
95 if (ACPI_FAILURE(result)) {
96 pr_err("Could not get Bluetooth device status\n");
97 return -ENXIO;
98 }
99
100 return status;
101 }
102
toshiba_bluetooth_enable(acpi_handle handle)103 static int toshiba_bluetooth_enable(acpi_handle handle)
104 {
105 acpi_status result;
106
107 result = acpi_evaluate_object(handle, "AUSB", NULL, NULL);
108 if (ACPI_FAILURE(result)) {
109 pr_err("Could not attach USB Bluetooth device\n");
110 return -ENXIO;
111 }
112
113 result = acpi_evaluate_object(handle, "BTPO", NULL, NULL);
114 if (ACPI_FAILURE(result)) {
115 pr_err("Could not power ON Bluetooth device\n");
116 return -ENXIO;
117 }
118
119 return 0;
120 }
121
toshiba_bluetooth_disable(acpi_handle handle)122 static int toshiba_bluetooth_disable(acpi_handle handle)
123 {
124 acpi_status result;
125
126 result = acpi_evaluate_object(handle, "BTPF", NULL, NULL);
127 if (ACPI_FAILURE(result)) {
128 pr_err("Could not power OFF Bluetooth device\n");
129 return -ENXIO;
130 }
131
132 result = acpi_evaluate_object(handle, "DUSB", NULL, NULL);
133 if (ACPI_FAILURE(result)) {
134 pr_err("Could not detach USB Bluetooth device\n");
135 return -ENXIO;
136 }
137
138 return 0;
139 }
140
141 /* Helper function */
toshiba_bluetooth_sync_status(struct toshiba_bluetooth_dev * bt_dev)142 static int toshiba_bluetooth_sync_status(struct toshiba_bluetooth_dev *bt_dev)
143 {
144 int status;
145
146 status = toshiba_bluetooth_status(bt_dev->acpi_dev->handle);
147 if (status < 0) {
148 pr_err("Could not sync bluetooth device status\n");
149 return status;
150 }
151
152 bt_dev->killswitch = (status & BT_KILLSWITCH_MASK) ? true : false;
153 bt_dev->plugged = (status & BT_PLUGGED_MASK) ? true : false;
154 bt_dev->powered = (status & BT_POWER_MASK) ? true : false;
155
156 pr_debug("Bluetooth status %d killswitch %d plugged %d powered %d\n",
157 status, bt_dev->killswitch, bt_dev->plugged, bt_dev->powered);
158
159 return 0;
160 }
161
162 /* RFKill handlers */
bt_rfkill_set_block(void * data,bool blocked)163 static int bt_rfkill_set_block(void *data, bool blocked)
164 {
165 struct toshiba_bluetooth_dev *bt_dev = data;
166 int ret;
167
168 ret = toshiba_bluetooth_sync_status(bt_dev);
169 if (ret)
170 return ret;
171
172 if (!bt_dev->killswitch)
173 return 0;
174
175 if (blocked)
176 ret = toshiba_bluetooth_disable(bt_dev->acpi_dev->handle);
177 else
178 ret = toshiba_bluetooth_enable(bt_dev->acpi_dev->handle);
179
180 return ret;
181 }
182
bt_rfkill_poll(struct rfkill * rfkill,void * data)183 static void bt_rfkill_poll(struct rfkill *rfkill, void *data)
184 {
185 struct toshiba_bluetooth_dev *bt_dev = data;
186
187 if (toshiba_bluetooth_sync_status(bt_dev))
188 return;
189
190 /*
191 * Note the Toshiba Bluetooth RFKill switch seems to be a strange
192 * fish. It only provides a BT event when the switch is flipped to
193 * the 'on' position. When flipping it to 'off', the USB device is
194 * simply pulled away underneath us, without any BT event being
195 * delivered.
196 */
197 rfkill_set_hw_state(bt_dev->rfk, !bt_dev->killswitch);
198 }
199
200 static const struct rfkill_ops rfk_ops = {
201 .set_block = bt_rfkill_set_block,
202 .poll = bt_rfkill_poll,
203 };
204
205 /* ACPI driver functions */
toshiba_bt_rfkill_notify(struct acpi_device * device,u32 event)206 static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event)
207 {
208 struct toshiba_bluetooth_dev *bt_dev = acpi_driver_data(device);
209
210 if (toshiba_bluetooth_sync_status(bt_dev))
211 return;
212
213 rfkill_set_hw_state(bt_dev->rfk, !bt_dev->killswitch);
214 }
215
216 #ifdef CONFIG_PM_SLEEP
toshiba_bt_resume(struct device * dev)217 static int toshiba_bt_resume(struct device *dev)
218 {
219 struct toshiba_bluetooth_dev *bt_dev;
220 int ret;
221
222 bt_dev = acpi_driver_data(to_acpi_device(dev));
223
224 ret = toshiba_bluetooth_sync_status(bt_dev);
225 if (ret)
226 return ret;
227
228 rfkill_set_hw_state(bt_dev->rfk, !bt_dev->killswitch);
229
230 return 0;
231 }
232 #endif
233
toshiba_bt_rfkill_add(struct acpi_device * device)234 static int toshiba_bt_rfkill_add(struct acpi_device *device)
235 {
236 struct toshiba_bluetooth_dev *bt_dev;
237 int result;
238
239 result = toshiba_bluetooth_present(device->handle);
240 if (result)
241 return result;
242
243 pr_info("Toshiba ACPI Bluetooth device driver\n");
244
245 bt_dev = kzalloc(sizeof(*bt_dev), GFP_KERNEL);
246 if (!bt_dev)
247 return -ENOMEM;
248 bt_dev->acpi_dev = device;
249 device->driver_data = bt_dev;
250 dev_set_drvdata(&device->dev, bt_dev);
251
252 result = toshiba_bluetooth_sync_status(bt_dev);
253 if (result) {
254 kfree(bt_dev);
255 return result;
256 }
257
258 bt_dev->rfk = rfkill_alloc("Toshiba Bluetooth",
259 &device->dev,
260 RFKILL_TYPE_BLUETOOTH,
261 &rfk_ops,
262 bt_dev);
263 if (!bt_dev->rfk) {
264 pr_err("Unable to allocate rfkill device\n");
265 kfree(bt_dev);
266 return -ENOMEM;
267 }
268
269 rfkill_set_hw_state(bt_dev->rfk, !bt_dev->killswitch);
270
271 result = rfkill_register(bt_dev->rfk);
272 if (result) {
273 pr_err("Unable to register rfkill device\n");
274 rfkill_destroy(bt_dev->rfk);
275 kfree(bt_dev);
276 }
277
278 return result;
279 }
280
toshiba_bt_rfkill_remove(struct acpi_device * device)281 static void toshiba_bt_rfkill_remove(struct acpi_device *device)
282 {
283 struct toshiba_bluetooth_dev *bt_dev = acpi_driver_data(device);
284
285 /* clean up */
286 if (bt_dev->rfk) {
287 rfkill_unregister(bt_dev->rfk);
288 rfkill_destroy(bt_dev->rfk);
289 }
290
291 kfree(bt_dev);
292
293 toshiba_bluetooth_disable(device->handle);
294 }
295
296 module_acpi_driver(toshiba_bt_rfkill_driver);
297