[deliverable/linux.git] / drivers / platform / x86 / toshiba_bluetooth.c

/*
 * Toshiba Bluetooth Enable Driver
 *
 * Copyright (C) 2009 Jes Sorensen <Jes.Sorensen@gmail.com>
 *
 * Thanks to Matthew Garrett for background info on ACPI innards which
 * normal people aren't meant to understand :-)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Note the Toshiba Bluetooth RFKill switch seems to be a strange
 * fish. It only provides a BT event when the switch is flipped to
 * the 'on' position. When flipping it to 'off', the USB device is
 * simply pulled away underneath us, without any BT event being
 * delivered.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

MODULE_AUTHOR("Jes Sorensen <Jes.Sorensen@gmail.com>");
MODULE_DESCRIPTION("Toshiba Laptop ACPI Bluetooth Enable Driver");
MODULE_LICENSE("GPL");


static int toshiba_bt_rfkill_add(struct acpi_device *device);
static int toshiba_bt_rfkill_remove(struct acpi_device *device, int type);
static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event);

static const struct acpi_device_id bt_device_ids[] = {
	{ "TOS6205", 0},
	{ "", 0},
};
MODULE_DEVICE_TABLE(acpi, bt_device_ids);

#ifdef CONFIG_PM_SLEEP
static int toshiba_bt_resume(struct device *dev);
#endif
static SIMPLE_DEV_PM_OPS(toshiba_bt_pm, NULL, toshiba_bt_resume);

static struct acpi_driver toshiba_bt_rfkill_driver = {
	.name =		"Toshiba BT",
	.class =	"Toshiba",
	.ids =		bt_device_ids,
	.ops =		{
				.add =		toshiba_bt_rfkill_add,
				.remove =	toshiba_bt_rfkill_remove,
				.notify =	toshiba_bt_rfkill_notify,
			},
	.owner = 	THIS_MODULE,
	.drv.pm =	&toshiba_bt_pm,
};


static int toshiba_bluetooth_enable(acpi_handle handle)
{
	acpi_status res1, res2;
	u64 result;

	/*
	 * Query ACPI to verify RFKill switch is set to 'on'.
	 * If not, we return silently, no need to report it as
	 * an error.
	 */
	res1 = acpi_evaluate_integer(handle, "BTST", NULL, &result);
	if (ACPI_FAILURE(res1))
		return res1;
	if (!(result & 0x01))
		return 0;

	pr_info("Re-enabling Toshiba Bluetooth\n");
	res1 = acpi_evaluate_object(handle, "AUSB", NULL, NULL);
	res2 = acpi_evaluate_object(handle, "BTPO", NULL, NULL);
	if (!ACPI_FAILURE(res1) || !ACPI_FAILURE(res2))
		return 0;

	pr_warn("Failed to re-enable Toshiba Bluetooth\n");

	return -ENODEV;
}

static void toshiba_bt_rfkill_notify(struct acpi_device *device, u32 event)
{
	toshiba_bluetooth_enable(device->handle);
}

#ifdef CONFIG_PM_SLEEP
static int toshiba_bt_resume(struct device *dev)
{
	return toshiba_bluetooth_enable(to_acpi_device(dev)->handle);
}
#endif

static int toshiba_bt_rfkill_add(struct acpi_device *device)
{
	acpi_status status;
	u64 bt_present;
	int result = -ENODEV;

	/*
	 * Some Toshiba laptops may have a fake TOS6205 device in
	 * their ACPI BIOS, so query the _STA method to see if there
	 * is really anything there, before trying to enable it.
	 */
	status = acpi_evaluate_integer(device->handle, "_STA", NULL,
				       &bt_present);

	if (!ACPI_FAILURE(status) && bt_present) {
		pr_info("Detected Toshiba ACPI Bluetooth device - "
			"installing RFKill handler\n");
		result = toshiba_bluetooth_enable(device->handle);
	}

	return result;
}

static int __init toshiba_bt_rfkill_init(void)
{
	int result;

	result = acpi_bus_register_driver(&toshiba_bt_rfkill_driver);
	if (result < 0) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Error registering driver\n"));
		return result;
	}

	return 0;
}

static int toshiba_bt_rfkill_remove(struct acpi_device *device, int type)
{
	/* clean up */
	return 0;
}

static void __exit toshiba_bt_rfkill_exit(void)
{
	acpi_bus_unregister_driver(&toshiba_bt_rfkill_driver);
}

module_init(toshiba_bt_rfkill_init);
module_exit(toshiba_bt_rfkill_exit);
Commit	Line	Data
42b4e9ee JS	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
7e33460d JP	20	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7e33460d JP	21
42b4e9ee JS	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);
42b4e9ee JS	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
3567a4e2	44	#ifdef CONFIG_PM_SLEEP
d69239ae	45	static int toshiba_bt_resume(struct device *dev);
3567a4e2	46	#endif
d69239ae RW	47	static SIMPLE_DEV_PM_OPS(toshiba_bt_pm, NULL, toshiba_bt_resume);
d69239ae RW	48
42b4e9ee JS	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,
42b4e9ee JS	57	},
42b4e9ee JS	58	.owner = THIS_MODULE,
d69239ae	59	.drv.pm = &toshiba_bt_pm,
42b4e9ee JS	60	};
	61
	62
	63	static int toshiba_bluetooth_enable(acpi_handle handle)
	64	{
	65	acpi_status res1, res2;
439913ff	66	u64 result;
42b4e9ee JS	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
7e33460d	79	pr_info("Re-enabling Toshiba Bluetooth\n");
42b4e9ee JS	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
7e33460d	85	pr_warn("Failed to re-enable Toshiba Bluetooth\n");
42b4e9ee JS	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
3567a4e2	95	#ifdef CONFIG_PM_SLEEP
d69239ae	96	static int toshiba_bt_resume(struct device *dev)
42b4e9ee	97	{
d69239ae	98	return toshiba_bluetooth_enable(to_acpi_device(dev)->handle);
42b4e9ee	99	}
3567a4e2	100	#endif
42b4e9ee JS	101
	102	static int toshiba_bt_rfkill_add(struct acpi_device *device)
	103	{
	104	acpi_status status;
439913ff	105	u64 bt_present;
42b4e9ee JS	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) {
7e33460d JP	117	pr_info("Detected Toshiba ACPI Bluetooth device - "
7e33460d JP	118	"installing RFKill handler\n");
42b4e9ee JS	119	result = toshiba_bluetooth_enable(device->handle);
	120	}
	121
	122	return result;
	123	}
	124
	125	static int __init toshiba_bt_rfkill_init(void)
	126	{
	127	int result;
	128
	129	result = acpi_bus_register_driver(&toshiba_bt_rfkill_driver);
	130	if (result < 0) {
	131	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	132	"Error registering driver\n"));
	133	return result;
	134	}
	135
	136	return 0;
	137	}
	138
	139	static int toshiba_bt_rfkill_remove(struct acpi_device *device, int type)
	140	{
	141	/* clean up */
	142	return 0;
	143	}
	144
	145	static void __exit toshiba_bt_rfkill_exit(void)
	146	{
	147	acpi_bus_unregister_driver(&toshiba_bt_rfkill_driver);
	148	}
	149
	150	module_init(toshiba_bt_rfkill_init);
	151	module_exit(toshiba_bt_rfkill_exit);