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);