LXR linux/drivers/platform/x86/toshiba

   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
  29MODULE_AUTHOR("Jes Sorensen <Jes.Sorensen@gmail.com>");
  30MODULE_DESCRIPTION("Toshiba Laptop ACPI Bluetooth Enable Driver");
  31MODULE_LICENSE("GPL");
  32
  33
  34static int toshiba_bt_rfkill_add(struct acpi_device *device);
  35static int toshiba_bt_rfkill_remove(struct acpi_device *device);
  36static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event);
  37
  38static const struct acpi_device_id bt_device_ids[] = {
  39        { "TOS6205", 0},
  40        { "", 0},
  41};
  42MODULE_DEVICE_TABLE(acpi, bt_device_ids);
  43
  44#ifdef CONFIG_PM_SLEEP
  45static int toshiba_bt_resume(struct device *dev);
  46#endif
  47static SIMPLE_DEV_PM_OPS(toshiba_bt_pm, NULL, toshiba_bt_resume);
  48
  49static struct acpi_driver toshiba_bt_rfkill_driver = {
  50        .name =         "Toshiba BT",
  51        .class =        "Toshiba",
  52        .ids =          bt_device_ids,
  53        .ops =          {
  54                                .add =          toshiba_bt_rfkill_add,
  55                                .remove =       toshiba_bt_rfkill_remove,
  56                                .notify =       toshiba_bt_rfkill_notify,
  57                        },
  58        .owner =        THIS_MODULE,
  59        .drv.pm =       &toshiba_bt_pm,
  60};
  61
  62
  63static int toshiba_bluetooth_enable(acpi_handle handle)
  64{
  65        acpi_status res1, res2;
  66        u64 result;
  67
  68        /*
  69         * Query ACPI to verify RFKill switch is set to 'on'.
  70         * If not, we return silently, no need to report it as
  71         * an error.
  72         */
  73        res1 = acpi_evaluate_integer(handle, "BTST", NULL, &result);
  74        if (ACPI_FAILURE(res1))
  75                return res1;
  76        if (!(result & 0x01))
  77                return 0;
  78
  79        pr_info("Re-enabling Toshiba Bluetooth\n");
  80        res1 = acpi_evaluate_object(handle, "AUSB", NULL, NULL);
  81        res2 = acpi_evaluate_object(handle, "BTPO", NULL, NULL);
  82        if (!ACPI_FAILURE(res1) || !ACPI_FAILURE(res2))
  83                return 0;
  84
  85        pr_warn("Failed to re-enable Toshiba Bluetooth\n");
  86
  87        return -ENODEV;
  88}
  89
  90static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event)
  91{
  92        toshiba_bluetooth_enable(device->handle);
  93}
  94
  95#ifdef CONFIG_PM_SLEEP
  96static int toshiba_bt_resume(struct device *dev)
  97{
  98        return toshiba_bluetooth_enable(to_acpi_device(dev)->handle);
  99}
 100#endif
 101
 102static int toshiba_bt_rfkill_add(struct acpi_device *device)
 103{
 104        acpi_status status;
 105        u64 bt_present;
 106        int result = -ENODEV;
 107
 108        /*
 109         * Some Toshiba laptops may have a fake TOS6205 device in
 110         * their ACPI BIOS, so query the _STA method to see if there
 111         * is really anything there, before trying to enable it.
 112         */
 113        status = acpi_evaluate_integer(device->handle, "_STA", NULL,
 114                                       &bt_present);
 115
 116        if (!ACPI_FAILURE(status) && bt_present) {
 117                pr_info("Detected Toshiba ACPI Bluetooth device - "
 118                        "installing RFKill handler\n");
 119                result = toshiba_bluetooth_enable(device->handle);
 120        }
 121
 122        return result;
 123}
 124
 125static int toshiba_bt_rfkill_remove(struct acpi_device *device)
 126{
 127        /* clean up */
 128        return 0;
 129}
 130
 131module_acpi_driver(toshiba_bt_rfkill_driver);
 132