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Linux/drivers/platform/x86/toshiba_bluetooth.c

  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 
 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 
 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 
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 
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 */
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 */
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 
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 */
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
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 
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 
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 

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