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); 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 #ifdef CONFIG_PM_SLEEP 45 static int toshiba_bt_resume(struct device *dev); 46 #endif 47 static SIMPLE_DEV_PM_OPS(toshiba_bt_pm, NULL, toshiba_bt_resume); 48 49 static 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 63 static 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 90 static 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 96 static int toshiba_bt_resume(struct device *dev) 97 { 98 return toshiba_bluetooth_enable(to_acpi_device(dev)->handle); 99 } 100 #endif 101 102 static 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 } 124 125 static int toshiba_bt_rfkill_remove(struct acpi_device *device) 126 { 127 /* clean up */ 128 return 0; 129 } 130 131 module_acpi_driver(toshiba_bt_rfkill_driver); 132