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/drivers/platform/x86/toshiba_bluetooth.c

http://github.com/mirrors/linux
C | 297 lines | 210 code | 61 blank | 26 comment | 20 complexity | cf71a56c991a364007bd5ceb1a306a86 MD5 | raw file
  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 int 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 int 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	return toshiba_bluetooth_disable(device->handle);
295}
296
297module_acpi_driver(toshiba_bt_rfkill_driver);