51fac8388a
The second argument of ACPI driver .remove() operation is only used by the ACPI processor driver and the value passed to that driver through it is always available from the given struct acpi_device object's removal_type field. For this reason, the second ACPI driver .remove() argument is in fact useless, so drop it. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Jiang Liu <jiang.liu@huawei.com> Acked-by: Toshi Kani <toshi.kani@hp.com> Acked-by: Yinghai Lu <yinghai@kernel.org>
132 lines
3.5 KiB
C
132 lines
3.5 KiB
C
/*
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* Toshiba Bluetooth Enable Driver
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*
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* Copyright (C) 2009 Jes Sorensen <Jes.Sorensen@gmail.com>
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*
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* Thanks to Matthew Garrett for background info on ACPI innards which
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* normal people aren't meant to understand :-)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Note the Toshiba Bluetooth RFKill switch seems to be a strange
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* fish. It only provides a BT event when the switch is flipped to
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* the 'on' position. When flipping it to 'off', the USB device is
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* simply pulled away underneath us, without any BT event being
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* delivered.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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MODULE_AUTHOR("Jes Sorensen <Jes.Sorensen@gmail.com>");
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MODULE_DESCRIPTION("Toshiba Laptop ACPI Bluetooth Enable Driver");
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MODULE_LICENSE("GPL");
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static int toshiba_bt_rfkill_add(struct acpi_device *device);
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static int toshiba_bt_rfkill_remove(struct acpi_device *device);
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static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event);
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static const struct acpi_device_id bt_device_ids[] = {
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{ "TOS6205", 0},
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{ "", 0},
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};
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MODULE_DEVICE_TABLE(acpi, bt_device_ids);
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#ifdef CONFIG_PM_SLEEP
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static int toshiba_bt_resume(struct device *dev);
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#endif
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static SIMPLE_DEV_PM_OPS(toshiba_bt_pm, NULL, toshiba_bt_resume);
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static struct acpi_driver toshiba_bt_rfkill_driver = {
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.name = "Toshiba BT",
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.class = "Toshiba",
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.ids = bt_device_ids,
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.ops = {
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.add = toshiba_bt_rfkill_add,
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.remove = toshiba_bt_rfkill_remove,
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.notify = toshiba_bt_rfkill_notify,
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},
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.owner = THIS_MODULE,
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.drv.pm = &toshiba_bt_pm,
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};
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static int toshiba_bluetooth_enable(acpi_handle handle)
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{
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acpi_status res1, res2;
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u64 result;
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/*
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* Query ACPI to verify RFKill switch is set to 'on'.
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* If not, we return silently, no need to report it as
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* an error.
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*/
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res1 = acpi_evaluate_integer(handle, "BTST", NULL, &result);
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if (ACPI_FAILURE(res1))
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return res1;
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if (!(result & 0x01))
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return 0;
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pr_info("Re-enabling Toshiba Bluetooth\n");
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res1 = acpi_evaluate_object(handle, "AUSB", NULL, NULL);
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res2 = acpi_evaluate_object(handle, "BTPO", NULL, NULL);
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if (!ACPI_FAILURE(res1) || !ACPI_FAILURE(res2))
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return 0;
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pr_warn("Failed to re-enable Toshiba Bluetooth\n");
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return -ENODEV;
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}
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static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event)
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{
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toshiba_bluetooth_enable(device->handle);
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}
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#ifdef CONFIG_PM_SLEEP
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static int toshiba_bt_resume(struct device *dev)
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{
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return toshiba_bluetooth_enable(to_acpi_device(dev)->handle);
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}
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#endif
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static int toshiba_bt_rfkill_add(struct acpi_device *device)
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{
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acpi_status status;
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u64 bt_present;
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int result = -ENODEV;
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/*
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* Some Toshiba laptops may have a fake TOS6205 device in
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* their ACPI BIOS, so query the _STA method to see if there
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* is really anything there, before trying to enable it.
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*/
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status = acpi_evaluate_integer(device->handle, "_STA", NULL,
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&bt_present);
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if (!ACPI_FAILURE(status) && bt_present) {
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pr_info("Detected Toshiba ACPI Bluetooth device - "
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"installing RFKill handler\n");
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result = toshiba_bluetooth_enable(device->handle);
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}
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return result;
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}
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static int toshiba_bt_rfkill_remove(struct acpi_device *device)
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{
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/* clean up */
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return 0;
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}
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module_acpi_driver(toshiba_bt_rfkill_driver);
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