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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  *
  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 <linux/acpi.h>
 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 static int toshiba_bt_rfkill_add(struct acpi_device *device);
 33 static int toshiba_bt_rfkill_remove(struct acpi_device *device);
 34 static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event);
 35 
 36 static const struct acpi_device_id bt_device_ids[] = {
 37         { "TOS6205", 0},
 38         { "", 0},
 39 };
 40 MODULE_DEVICE_TABLE(acpi, bt_device_ids);
 41 
 42 #ifdef CONFIG_PM_SLEEP
 43 static int toshiba_bt_resume(struct device *dev);
 44 #endif
 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 #ifdef CONFIG_PM_SLEEP
 94 static int toshiba_bt_resume(struct device *dev)
 95 {
 96         return toshiba_bluetooth_enable(to_acpi_device(dev)->handle);
 97 }
 98 #endif
 99 
100 static int toshiba_bt_rfkill_add(struct acpi_device *device)
101 {
102         acpi_status status;
103         u64 bt_present;
104         int result = -ENODEV;
105 
106         /*
107          * Some Toshiba laptops may have a fake TOS6205 device in
108          * their ACPI BIOS, so query the _STA method to see if there
109          * is really anything there, before trying to enable it.
110          */
111         status = acpi_evaluate_integer(device->handle, "_STA", NULL,
112                                        &bt_present);
113 
114         if (!ACPI_FAILURE(status) && bt_present) {
115                 pr_info("Detected Toshiba ACPI Bluetooth device - "
116                         "installing RFKill handler\n");
117                 result = toshiba_bluetooth_enable(device->handle);
118         }
119 
120         return result;
121 }
122 
123 static int toshiba_bt_rfkill_remove(struct acpi_device *device)
124 {
125         /* clean up */
126         return 0;
127 }
128 
129 module_acpi_driver(toshiba_bt_rfkill_driver);
130 

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