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 
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 
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 
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 
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 */
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 */
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 
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 */
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
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 
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 
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