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 .owner = THIS_MODULE,
63 .drv.pm = &toshiba_bt_pm,
64 };
65
toshiba_bluetooth_present(acpi_handle handle)66 static int toshiba_bluetooth_present(acpi_handle handle)
67 {
68 acpi_status result;
69 u64 bt_present;
70
71 /*
72 * Some Toshiba laptops may have a fake TOS6205 device in
73 * their ACPI BIOS, so query the _STA method to see if there
74 * is really anything there.
75 */
76 result = acpi_evaluate_integer(handle, "_STA", NULL, &bt_present);
77 if (ACPI_FAILURE(result)) {
78 pr_err("ACPI call to query Bluetooth presence failed\n");
79 return -ENXIO;
80 }
81
82 if (!bt_present) {
83 pr_info("Bluetooth device not present\n");
84 return -ENODEV;
85 }
86
87 return 0;
88 }
89
toshiba_bluetooth_status(acpi_handle handle)90 static int toshiba_bluetooth_status(acpi_handle handle)
91 {
92 acpi_status result;
93 u64 status;
94
95 result = acpi_evaluate_integer(handle, "BTST", NULL, &status);
96 if (ACPI_FAILURE(result)) {
97 pr_err("Could not get Bluetooth device status\n");
98 return -ENXIO;
99 }
100
101 return status;
102 }
103
toshiba_bluetooth_enable(acpi_handle handle)104 static int toshiba_bluetooth_enable(acpi_handle handle)
105 {
106 acpi_status result;
107
108 result = acpi_evaluate_object(handle, "AUSB", NULL, NULL);
109 if (ACPI_FAILURE(result)) {
110 pr_err("Could not attach USB Bluetooth device\n");
111 return -ENXIO;
112 }
113
114 result = acpi_evaluate_object(handle, "BTPO", NULL, NULL);
115 if (ACPI_FAILURE(result)) {
116 pr_err("Could not power ON Bluetooth device\n");
117 return -ENXIO;
118 }
119
120 return 0;
121 }
122
toshiba_bluetooth_disable(acpi_handle handle)123 static int toshiba_bluetooth_disable(acpi_handle handle)
124 {
125 acpi_status result;
126
127 result = acpi_evaluate_object(handle, "BTPF", NULL, NULL);
128 if (ACPI_FAILURE(result)) {
129 pr_err("Could not power OFF Bluetooth device\n");
130 return -ENXIO;
131 }
132
133 result = acpi_evaluate_object(handle, "DUSB", NULL, NULL);
134 if (ACPI_FAILURE(result)) {
135 pr_err("Could not detach USB Bluetooth device\n");
136 return -ENXIO;
137 }
138
139 return 0;
140 }
141
142 /* Helper function */
toshiba_bluetooth_sync_status(struct toshiba_bluetooth_dev * bt_dev)143 static int toshiba_bluetooth_sync_status(struct toshiba_bluetooth_dev *bt_dev)
144 {
145 int status;
146
147 status = toshiba_bluetooth_status(bt_dev->acpi_dev->handle);
148 if (status < 0) {
149 pr_err("Could not sync bluetooth device status\n");
150 return status;
151 }
152
153 bt_dev->killswitch = (status & BT_KILLSWITCH_MASK) ? true : false;
154 bt_dev->plugged = (status & BT_PLUGGED_MASK) ? true : false;
155 bt_dev->powered = (status & BT_POWER_MASK) ? true : false;
156
157 pr_debug("Bluetooth status %d killswitch %d plugged %d powered %d\n",
158 status, bt_dev->killswitch, bt_dev->plugged, bt_dev->powered);
159
160 return 0;
161 }
162
163 /* RFKill handlers */
bt_rfkill_set_block(void * data,bool blocked)164 static int bt_rfkill_set_block(void *data, bool blocked)
165 {
166 struct toshiba_bluetooth_dev *bt_dev = data;
167 int ret;
168
169 ret = toshiba_bluetooth_sync_status(bt_dev);
170 if (ret)
171 return ret;
172
173 if (!bt_dev->killswitch)
174 return 0;
175
176 if (blocked)
177 ret = toshiba_bluetooth_disable(bt_dev->acpi_dev->handle);
178 else
179 ret = toshiba_bluetooth_enable(bt_dev->acpi_dev->handle);
180
181 return ret;
182 }
183
bt_rfkill_poll(struct rfkill * rfkill,void * data)184 static void bt_rfkill_poll(struct rfkill *rfkill, void *data)
185 {
186 struct toshiba_bluetooth_dev *bt_dev = data;
187
188 if (toshiba_bluetooth_sync_status(bt_dev))
189 return;
190
191 /*
192 * Note the Toshiba Bluetooth RFKill switch seems to be a strange
193 * fish. It only provides a BT event when the switch is flipped to
194 * the 'on' position. When flipping it to 'off', the USB device is
195 * simply pulled away underneath us, without any BT event being
196 * delivered.
197 */
198 rfkill_set_hw_state(bt_dev->rfk, !bt_dev->killswitch);
199 }
200
201 static const struct rfkill_ops rfk_ops = {
202 .set_block = bt_rfkill_set_block,
203 .poll = bt_rfkill_poll,
204 };
205
206 /* ACPI driver functions */
toshiba_bt_rfkill_notify(struct acpi_device * device,u32 event)207 static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event)
208 {
209 struct toshiba_bluetooth_dev *bt_dev = acpi_driver_data(device);
210
211 if (toshiba_bluetooth_sync_status(bt_dev))
212 return;
213
214 rfkill_set_hw_state(bt_dev->rfk, !bt_dev->killswitch);
215 }
216
217 #ifdef CONFIG_PM_SLEEP
toshiba_bt_resume(struct device * dev)218 static int toshiba_bt_resume(struct device *dev)
219 {
220 struct toshiba_bluetooth_dev *bt_dev;
221 int ret;
222
223 bt_dev = acpi_driver_data(to_acpi_device(dev));
224
225 ret = toshiba_bluetooth_sync_status(bt_dev);
226 if (ret)
227 return ret;
228
229 rfkill_set_hw_state(bt_dev->rfk, !bt_dev->killswitch);
230
231 return 0;
232 }
233 #endif
234
toshiba_bt_rfkill_add(struct acpi_device * device)235 static int toshiba_bt_rfkill_add(struct acpi_device *device)
236 {
237 struct toshiba_bluetooth_dev *bt_dev;
238 int result;
239
240 result = toshiba_bluetooth_present(device->handle);
241 if (result)
242 return result;
243
244 pr_info("Toshiba ACPI Bluetooth device driver\n");
245
246 bt_dev = kzalloc(sizeof(*bt_dev), GFP_KERNEL);
247 if (!bt_dev)
248 return -ENOMEM;
249 bt_dev->acpi_dev = device;
250 device->driver_data = bt_dev;
251 dev_set_drvdata(&device->dev, bt_dev);
252
253 result = toshiba_bluetooth_sync_status(bt_dev);
254 if (result) {
255 kfree(bt_dev);
256 return result;
257 }
258
259 bt_dev->rfk = rfkill_alloc("Toshiba Bluetooth",
260 &device->dev,
261 RFKILL_TYPE_BLUETOOTH,
262 &rfk_ops,
263 bt_dev);
264 if (!bt_dev->rfk) {
265 pr_err("Unable to allocate rfkill device\n");
266 kfree(bt_dev);
267 return -ENOMEM;
268 }
269
270 rfkill_set_hw_state(bt_dev->rfk, !bt_dev->killswitch);
271
272 result = rfkill_register(bt_dev->rfk);
273 if (result) {
274 pr_err("Unable to register rfkill device\n");
275 rfkill_destroy(bt_dev->rfk);
276 kfree(bt_dev);
277 }
278
279 return result;
280 }
281
toshiba_bt_rfkill_remove(struct acpi_device * device)282 static void toshiba_bt_rfkill_remove(struct acpi_device *device)
283 {
284 struct toshiba_bluetooth_dev *bt_dev = acpi_driver_data(device);
285
286 /* clean up */
287 if (bt_dev->rfk) {
288 rfkill_unregister(bt_dev->rfk);
289 rfkill_destroy(bt_dev->rfk);
290 }
291
292 kfree(bt_dev);
293
294 toshiba_bluetooth_disable(device->handle);
295 }
296
297 module_acpi_driver(toshiba_bt_rfkill_driver);
298
