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
25MODULE_AUTHOR("Jes Sorensen <Jes.Sorensen@gmail.com>");
26MODULE_DESCRIPTION("Toshiba Laptop ACPI Bluetooth Enable Driver");
27MODULE_LICENSE("GPL");
28
29struct 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
38static int toshiba_bt_rfkill_add(struct acpi_device *device);
39static void toshiba_bt_rfkill_remove(struct acpi_device *device);
40static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event);
41
42static const struct acpi_device_id bt_device_ids[] = {
43	{ "TOS6205", 0},
44	{ "", 0},
45};
46MODULE_DEVICE_TABLE(acpi, bt_device_ids);
47
48#ifdef CONFIG_PM_SLEEP
49static int toshiba_bt_resume(struct device *dev);
50#endif
51static SIMPLE_DEV_PM_OPS(toshiba_bt_pm, NULL, toshiba_bt_resume);
52
53static 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
66static 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
90static 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
104static 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
123static 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 */
143static 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 */
164static 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
184static 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
201static const struct rfkill_ops rfk_ops = {
202	.set_block = bt_rfkill_set_block,
203	.poll = bt_rfkill_poll,
204};
205
206/* ACPI driver functions */
207static 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
218static 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
235static 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
282static 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
297module_acpi_driver(toshiba_bt_rfkill_driver);
298