1 /*
2 * Toshiba Bluetooth Enable Driver
3 *
4 * Copyright (C) 2009 Jes Sorensen <Jes.Sorensen@gmail.com>
5 * Copyright (C) 2015 Azael Avalos <coproscefalo@gmail.com>
6 *
7 * Thanks to Matthew Garrett for background info on ACPI innards which
8 * normal people aren't meant to understand :-)
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/types.h>
21 #include <linux/acpi.h>
22 #include <linux/rfkill.h>
23
24 #define BT_KILLSWITCH_MASK 0x01
25 #define BT_PLUGGED_MASK 0x40
26 #define BT_POWER_MASK 0x80
27
28 MODULE_AUTHOR("Jes Sorensen <Jes.Sorensen@gmail.com>");
29 MODULE_DESCRIPTION("Toshiba Laptop ACPI Bluetooth Enable Driver");
30 MODULE_LICENSE("GPL");
31
32 struct toshiba_bluetooth_dev {
33 struct acpi_device *acpi_dev;
34 struct rfkill *rfk;
35
36 bool killswitch;
37 bool plugged;
38 bool powered;
39 };
40
41 static int toshiba_bt_rfkill_add(struct acpi_device *device);
42 static int toshiba_bt_rfkill_remove(struct acpi_device *device);
43 static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event);
44
45 static const struct acpi_device_id bt_device_ids[] = {
46 { "TOS6205", 0},
47 { "", 0},
48 };
49 MODULE_DEVICE_TABLE(acpi, bt_device_ids);
50
51 #ifdef CONFIG_PM_SLEEP
52 static int toshiba_bt_resume(struct device *dev);
53 #endif
54 static SIMPLE_DEV_PM_OPS(toshiba_bt_pm, NULL, toshiba_bt_resume);
55
56 static struct acpi_driver toshiba_bt_rfkill_driver = {
57 .name = "Toshiba BT",
58 .class = "Toshiba",
59 .ids = bt_device_ids,
60 .ops = {
61 .add = toshiba_bt_rfkill_add,
62 .remove = toshiba_bt_rfkill_remove,
63 .notify = toshiba_bt_rfkill_notify,
64 },
65 .owner = THIS_MODULE,
66 .drv.pm = &toshiba_bt_pm,
67 };
68
toshiba_bluetooth_present(acpi_handle handle)69 static int toshiba_bluetooth_present(acpi_handle handle)
70 {
71 acpi_status result;
72 u64 bt_present;
73
74 /*
75 * Some Toshiba laptops may have a fake TOS6205 device in
76 * their ACPI BIOS, so query the _STA method to see if there
77 * is really anything there.
78 */
79 result = acpi_evaluate_integer(handle, "_STA", NULL, &bt_present);
80 if (ACPI_FAILURE(result)) {
81 pr_err("ACPI call to query Bluetooth presence failed\n");
82 return -ENXIO;
83 }
84
85 if (!bt_present) {
86 pr_info("Bluetooth device not present\n");
87 return -ENODEV;
88 }
89
90 return 0;
91 }
92
toshiba_bluetooth_status(acpi_handle handle)93 static int toshiba_bluetooth_status(acpi_handle handle)
94 {
95 acpi_status result;
96 u64 status;
97
98 result = acpi_evaluate_integer(handle, "BTST", NULL, &status);
99 if (ACPI_FAILURE(result)) {
100 pr_err("Could not get Bluetooth device status\n");
101 return -ENXIO;
102 }
103
104 return status;
105 }
106
toshiba_bluetooth_enable(acpi_handle handle)107 static int toshiba_bluetooth_enable(acpi_handle handle)
108 {
109 acpi_status result;
110
111 result = acpi_evaluate_object(handle, "AUSB", NULL, NULL);
112 if (ACPI_FAILURE(result)) {
113 pr_err("Could not attach USB Bluetooth device\n");
114 return -ENXIO;
115 }
116
117 result = acpi_evaluate_object(handle, "BTPO", NULL, NULL);
118 if (ACPI_FAILURE(result)) {
119 pr_err("Could not power ON Bluetooth device\n");
120 return -ENXIO;
121 }
122
123 return 0;
124 }
125
toshiba_bluetooth_disable(acpi_handle handle)126 static int toshiba_bluetooth_disable(acpi_handle handle)
127 {
128 acpi_status result;
129
130 result = acpi_evaluate_object(handle, "BTPF", NULL, NULL);
131 if (ACPI_FAILURE(result)) {
132 pr_err("Could not power OFF Bluetooth device\n");
133 return -ENXIO;
134 }
135
136 result = acpi_evaluate_object(handle, "DUSB", NULL, NULL);
137 if (ACPI_FAILURE(result)) {
138 pr_err("Could not detach USB Bluetooth device\n");
139 return -ENXIO;
140 }
141
142 return 0;
143 }
144
145 /* Helper function */
toshiba_bluetooth_sync_status(struct toshiba_bluetooth_dev * bt_dev)146 static int toshiba_bluetooth_sync_status(struct toshiba_bluetooth_dev *bt_dev)
147 {
148 int status;
149
150 status = toshiba_bluetooth_status(bt_dev->acpi_dev->handle);
151 if (status < 0) {
152 pr_err("Could not sync bluetooth device status\n");
153 return status;
154 }
155
156 bt_dev->killswitch = (status & BT_KILLSWITCH_MASK) ? true : false;
157 bt_dev->plugged = (status & BT_PLUGGED_MASK) ? true : false;
158 bt_dev->powered = (status & BT_POWER_MASK) ? true : false;
159
160 pr_debug("Bluetooth status %d killswitch %d plugged %d powered %d\n",
161 status, bt_dev->killswitch, bt_dev->plugged, bt_dev->powered);
162
163 return 0;
164 }
165
166 /* RFKill handlers */
bt_rfkill_set_block(void * data,bool blocked)167 static int bt_rfkill_set_block(void *data, bool blocked)
168 {
169 struct toshiba_bluetooth_dev *bt_dev = data;
170 int ret;
171
172 ret = toshiba_bluetooth_sync_status(bt_dev);
173 if (ret)
174 return ret;
175
176 if (!bt_dev->killswitch)
177 return 0;
178
179 if (blocked)
180 ret = toshiba_bluetooth_disable(bt_dev->acpi_dev->handle);
181 else
182 ret = toshiba_bluetooth_enable(bt_dev->acpi_dev->handle);
183
184 return ret;
185 }
186
bt_rfkill_poll(struct rfkill * rfkill,void * data)187 static void bt_rfkill_poll(struct rfkill *rfkill, void *data)
188 {
189 struct toshiba_bluetooth_dev *bt_dev = data;
190
191 if (toshiba_bluetooth_sync_status(bt_dev))
192 return;
193
194 /*
195 * Note the Toshiba Bluetooth RFKill switch seems to be a strange
196 * fish. It only provides a BT event when the switch is flipped to
197 * the 'on' position. When flipping it to 'off', the USB device is
198 * simply pulled away underneath us, without any BT event being
199 * delivered.
200 */
201 rfkill_set_hw_state(bt_dev->rfk, !bt_dev->killswitch);
202 }
203
204 static const struct rfkill_ops rfk_ops = {
205 .set_block = bt_rfkill_set_block,
206 .poll = bt_rfkill_poll,
207 };
208
209 /* ACPI driver functions */
toshiba_bt_rfkill_notify(struct acpi_device * device,u32 event)210 static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event)
211 {
212 struct toshiba_bluetooth_dev *bt_dev = acpi_driver_data(device);
213
214 if (toshiba_bluetooth_sync_status(bt_dev))
215 return;
216
217 rfkill_set_hw_state(bt_dev->rfk, !bt_dev->killswitch);
218 }
219
220 #ifdef CONFIG_PM_SLEEP
toshiba_bt_resume(struct device * dev)221 static int toshiba_bt_resume(struct device *dev)
222 {
223 struct toshiba_bluetooth_dev *bt_dev;
224 int ret;
225
226 bt_dev = acpi_driver_data(to_acpi_device(dev));
227
228 ret = toshiba_bluetooth_sync_status(bt_dev);
229 if (ret)
230 return ret;
231
232 rfkill_set_hw_state(bt_dev->rfk, !bt_dev->killswitch);
233
234 return 0;
235 }
236 #endif
237
toshiba_bt_rfkill_add(struct acpi_device * device)238 static int toshiba_bt_rfkill_add(struct acpi_device *device)
239 {
240 struct toshiba_bluetooth_dev *bt_dev;
241 int result;
242
243 result = toshiba_bluetooth_present(device->handle);
244 if (result)
245 return result;
246
247 pr_info("Toshiba ACPI Bluetooth device driver\n");
248
249 bt_dev = kzalloc(sizeof(*bt_dev), GFP_KERNEL);
250 if (!bt_dev)
251 return -ENOMEM;
252 bt_dev->acpi_dev = device;
253 device->driver_data = bt_dev;
254 dev_set_drvdata(&device->dev, bt_dev);
255
256 result = toshiba_bluetooth_sync_status(bt_dev);
257 if (result) {
258 kfree(bt_dev);
259 return result;
260 }
261
262 bt_dev->rfk = rfkill_alloc("Toshiba Bluetooth",
263 &device->dev,
264 RFKILL_TYPE_BLUETOOTH,
265 &rfk_ops,
266 bt_dev);
267 if (!bt_dev->rfk) {
268 pr_err("Unable to allocate rfkill device\n");
269 kfree(bt_dev);
270 return -ENOMEM;
271 }
272
273 rfkill_set_hw_state(bt_dev->rfk, !bt_dev->killswitch);
274
275 result = rfkill_register(bt_dev->rfk);
276 if (result) {
277 pr_err("Unable to register rfkill device\n");
278 rfkill_destroy(bt_dev->rfk);
279 kfree(bt_dev);
280 }
281
282 return result;
283 }
284
toshiba_bt_rfkill_remove(struct acpi_device * device)285 static int toshiba_bt_rfkill_remove(struct acpi_device *device)
286 {
287 struct toshiba_bluetooth_dev *bt_dev = acpi_driver_data(device);
288
289 /* clean up */
290 if (bt_dev->rfk) {
291 rfkill_unregister(bt_dev->rfk);
292 rfkill_destroy(bt_dev->rfk);
293 }
294
295 kfree(bt_dev);
296
297 return toshiba_bluetooth_disable(device->handle);
298 }
299
300 module_acpi_driver(toshiba_bt_rfkill_driver);
301
