Pileus Git - ~andy/linux/blob - drivers/platform/x86/toshiba_bluetooth.c

   1 /*
   2  * Toshiba Bluetooth Enable Driver
   3  *
   4  * Copyright (C) 2009 Jes Sorensen <Jes.Sorensen@gmail.com>
   5  *
   6  * Thanks to Matthew Garrett for background info on ACPI innards which
   7  * normal people aren't meant to understand :-)
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  * Note the Toshiba Bluetooth RFKill switch seems to be a strange
  14  * fish. It only provides a BT event when the switch is flipped to
  15  * the 'on' position. When flipping it to 'off', the USB device is
  16  * simply pulled away underneath us, without any BT event being
  17  * delivered.
  18  */
  19
  20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  21
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/types.h>
  26 #include <acpi/acpi_bus.h>
  27 #include <acpi/acpi_drivers.h>
  28
  29 MODULE_AUTHOR("Jes Sorensen <Jes.Sorensen@gmail.com>");
  30 MODULE_DESCRIPTION("Toshiba Laptop ACPI Bluetooth Enable Driver");
  31 MODULE_LICENSE("GPL");
  32
  33
  34 static int toshiba_bt_rfkill_add(struct acpi_device *device);
  35 static int toshiba_bt_rfkill_remove(struct acpi_device *device, int type);
  36 static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event);
  37
  38 static const struct acpi_device_id bt_device_ids[] = {
  39         { "TOS6205", 0},
  40         { "", 0},
  41 };
  42 MODULE_DEVICE_TABLE(acpi, bt_device_ids);
  43
  44 static int toshiba_bt_resume(struct device *dev);
  45 static SIMPLE_DEV_PM_OPS(toshiba_bt_pm, NULL, toshiba_bt_resume);
  46
  47 static struct acpi_driver toshiba_bt_rfkill_driver = {
  48         .name =         "Toshiba BT",
  49         .class =        "Toshiba",
  50         .ids =          bt_device_ids,
  51         .ops =          {
  52                                 .add =          toshiba_bt_rfkill_add,
  53                                 .remove =       toshiba_bt_rfkill_remove,
  54                                 .notify =       toshiba_bt_rfkill_notify,
  55                         },
  56         .owner =        THIS_MODULE,
  57         .drv.pm =       &toshiba_bt_pm,
  58 };
  59
  60
  61 static int toshiba_bluetooth_enable(acpi_handle handle)
  62 {
  63         acpi_status res1, res2;
  64         u64 result;
  65
  66         /*
  67          * Query ACPI to verify RFKill switch is set to 'on'.
  68          * If not, we return silently, no need to report it as
  69          * an error.
  70          */
  71         res1 = acpi_evaluate_integer(handle, "BTST", NULL, &result);
  72         if (ACPI_FAILURE(res1))
  73                 return res1;
  74         if (!(result & 0x01))
  75                 return 0;
  76
  77         pr_info("Re-enabling Toshiba Bluetooth\n");
  78         res1 = acpi_evaluate_object(handle, "AUSB", NULL, NULL);
  79         res2 = acpi_evaluate_object(handle, "BTPO", NULL, NULL);
  80         if (!ACPI_FAILURE(res1) || !ACPI_FAILURE(res2))
  81                 return 0;
  82
  83         pr_warn("Failed to re-enable Toshiba Bluetooth\n");
  84
  85         return -ENODEV;
  86 }
  87
  88 static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event)
  89 {
  90         toshiba_bluetooth_enable(device->handle);
  91 }
  92
  93 static int toshiba_bt_resume(struct device *dev)
  94 {
  95         return toshiba_bluetooth_enable(to_acpi_device(dev)->handle);
  96 }
  97
  98 static int toshiba_bt_rfkill_add(struct acpi_device *device)
  99 {
 100         acpi_status status;
 101         u64 bt_present;
 102         int result = -ENODEV;
 103
 104         /*
 105          * Some Toshiba laptops may have a fake TOS6205 device in
 106          * their ACPI BIOS, so query the _STA method to see if there
 107          * is really anything there, before trying to enable it.
 108          */
 109         status = acpi_evaluate_integer(device->handle, "_STA", NULL,
 110                                        &bt_present);
 111
 112         if (!ACPI_FAILURE(status) && bt_present) {
 113                 pr_info("Detected Toshiba ACPI Bluetooth device - "
 114                         "installing RFKill handler\n");
 115                 result = toshiba_bluetooth_enable(device->handle);
 116         }
 117
 118         return result;
 119 }
 120
 121 static int __init toshiba_bt_rfkill_init(void)
 122 {
 123         int result;
 124
 125         result = acpi_bus_register_driver(&toshiba_bt_rfkill_driver);
 126         if (result < 0) {
 127                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 128                                   "Error registering driver\n"));
 129                 return result;
 130         }
 131
 132         return 0;
 133 }
 134
 135 static int toshiba_bt_rfkill_remove(struct acpi_device *device, int type)
 136 {
 137         /* clean up */
 138         return 0;
 139 }
 140
 141 static void __exit toshiba_bt_rfkill_exit(void)
 142 {
 143         acpi_bus_unregister_driver(&toshiba_bt_rfkill_driver);
 144 }
 145
 146 module_init(toshiba_bt_rfkill_init);
 147 module_exit(toshiba_bt_rfkill_exit);