evxfevnt.c

linux-2.6.15.6

/******************************************************************************
 *
 * Module Name: evxfevnt - External Interfaces, ACPI event disable/enable
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2005, R. Byron Moore
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <linux/module.h>

#include <acpi/acpi.h>
#include <acpi/acevents.h>
#include <acpi/acnamesp.h>

#define _COMPONENT          ACPI_EVENTS
ACPI_MODULE_NAME("evxfevnt")

/*******************************************************************************
 *
 * FUNCTION:    acpi_enable
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Transfers the system into ACPI mode.
 *
 ******************************************************************************/
acpi_status acpi_enable(void)
{
	acpi_status status = AE_OK;

	ACPI_FUNCTION_TRACE("acpi_enable");

	/* Make sure we have the FADT */

	if (!acpi_gbl_FADT) {
		ACPI_DEBUG_PRINT((ACPI_DB_WARN,
				  "No FADT information present!\n"));
		return_ACPI_STATUS(AE_NO_ACPI_TABLES);
	}

	if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) {
		ACPI_DEBUG_PRINT((ACPI_DB_INIT,
				  "System is already in ACPI mode\n"));
	} else {
		/* Transition to ACPI mode */

		status = acpi_hw_set_mode(ACPI_SYS_MODE_ACPI);
		if (ACPI_FAILURE(status)) {
			ACPI_REPORT_ERROR(("Could not transition to ACPI mode.\n"));
			return_ACPI_STATUS(status);
		}

		ACPI_DEBUG_PRINT((ACPI_DB_INIT,
				  "Transition to ACPI mode successful\n"));
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_disable
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Transfers the system into LEGACY (non-ACPI) mode.
 *
 ******************************************************************************/

acpi_status acpi_disable(void)
{
	acpi_status status = AE_OK;

	ACPI_FUNCTION_TRACE("acpi_disable");

	if (!acpi_gbl_FADT) {
		ACPI_DEBUG_PRINT((ACPI_DB_WARN,
				  "No FADT information present!\n"));
		return_ACPI_STATUS(AE_NO_ACPI_TABLES);
	}

	if (acpi_hw_get_mode() == ACPI_SYS_MODE_LEGACY) {
		ACPI_DEBUG_PRINT((ACPI_DB_INIT,
				  "System is already in legacy (non-ACPI) mode\n"));
	} else {
		/* Transition to LEGACY mode */

		status = acpi_hw_set_mode(ACPI_SYS_MODE_LEGACY);

		if (ACPI_FAILURE(status)) {
			ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
					  "Could not exit ACPI mode to legacy mode"));
			return_ACPI_STATUS(status);
		}

		ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI mode disabled\n"));
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_enable_event
 *
 * PARAMETERS:  Event           - The fixed eventto be enabled
 *              Flags           - Reserved
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Enable an ACPI event (fixed)
 *
 ******************************************************************************/

acpi_status acpi_enable_event(u32 event, u32 flags)
{
	acpi_status status = AE_OK;
	u32 value;

	ACPI_FUNCTION_TRACE("acpi_enable_event");

	/* Decode the Fixed Event */

	if (event > ACPI_EVENT_MAX) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/*
	 * Enable the requested fixed event (by writing a one to the
	 * enable register bit)
	 */
	status =
	    acpi_set_register(acpi_gbl_fixed_event_info[event].
			      enable_register_id, 1, ACPI_MTX_LOCK);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Make sure that the hardware responded */

	status =
	    acpi_get_register(acpi_gbl_fixed_event_info[event].
			      enable_register_id, &value, ACPI_MTX_LOCK);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	if (value != 1) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Could not enable %s event\n",
				  acpi_ut_get_event_name(event)));
		return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
	}

	return_ACPI_STATUS(status);
}

EXPORT_SYMBOL(acpi_enable_event);

/*******************************************************************************
 *
 * FUNCTION:    acpi_set_gpe_type
 *
 * PARAMETERS:  gpe_device      - Parent GPE Device
 *              gpe_number      - GPE level within the GPE block
 *              Type            - New GPE type
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Set the type of an individual GPE
 *
 ******************************************************************************/

acpi_status acpi_set_gpe_type(acpi_handle gpe_device, u32 gpe_number, u8 type)
{
	acpi_status status = AE_OK;
	struct acpi_gpe_event_info *gpe_event_info;

	ACPI_FUNCTION_TRACE("acpi_set_gpe_type");

	/* Ensure that we have a valid GPE number */

	gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
	if (!gpe_event_info) {
		status = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}

	if ((gpe_event_info->flags & ACPI_GPE_TYPE_MASK) == type) {
		return_ACPI_STATUS(AE_OK);
	}

	/* Set the new type (will disable GPE if currently enabled) */

	status = acpi_ev_set_gpe_type(gpe_event_info, type);

      unlock_and_exit:
	return_ACPI_STATUS(status);
}

EXPORT_SYMBOL(acpi_set_gpe_type);

/*******************************************************************************
 *
 * FUNCTION:    acpi_enable_gpe
 *
 * PARAMETERS:  gpe_device      - Parent GPE Device
 *              gpe_number      - GPE level within the GPE block
 *              Flags           - Just enable, or also wake enable?
 *                                Called from ISR or not
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Enable an ACPI event (general purpose)
 *
 ******************************************************************************/

acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags)
{
	acpi_status status = AE_OK;
	struct acpi_gpe_event_info *gpe_event_info;

	ACPI_FUNCTION_TRACE("acpi_enable_gpe");

	/* Use semaphore lock if not executing at interrupt level */

	if (flags & ACPI_NOT_ISR) {
		status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}
	}

	/* Ensure that we have a valid GPE number */

	gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
	if (!gpe_event_info) {
		status = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}

	/* Perform the enable */

	status = acpi_ev_enable_gpe(gpe_event_info, TRUE);

      unlock_and_exit:
	if (flags & ACPI_NOT_ISR) {
		(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
	}
	return_ACPI_STATUS(status);
}

EXPORT_SYMBOL(acpi_enable_gpe);

/*******************************************************************************
 *
 * FUNCTION:    acpi_disable_gpe
 *
 * PARAMETERS:  gpe_device      - Parent GPE Device
 *              gpe_number      - GPE level within the GPE block
 *              Flags           - Just disable, or also wake disable?
 *                                Called from ISR or not
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Disable an ACPI event (general purpose)
 *
 ******************************************************************************/

acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags)
{
	acpi_status status = AE_OK;
	struct acpi_gpe_event_info *gpe_event_info;

	ACPI_FUNCTION_TRACE("acpi_disable_gpe");

	/* Use semaphore lock if not executing at interrupt level */

	if (flags & ACPI_NOT_ISR) {
		status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}
	}

	/* Ensure that we have a valid GPE number */

	gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
	if (!gpe_event_info) {
		status = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}

	status = acpi_ev_disable_gpe(gpe_event_info);

      unlock_and_exit:
	if (flags & ACPI_NOT_ISR) {
		(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
	}
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_disable_event
 *
 * PARAMETERS:  Event           - The fixed eventto be enabled
 *              Flags           - Reserved
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Disable an ACPI event (fixed)
 *
 ******************************************************************************/

acpi_status acpi_disable_event(u32 event, u32 flags)
{
	acpi_status status = AE_OK;
	u32 value;

	ACPI_FUNCTION_TRACE("acpi_disable_event");