hwgpe.c

linux-2.4.29操作系统的源码

/******************************************************************************
 *
 * Module Name: hwgpe - Low level GPE enable/disable/clear functions
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2004, 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 <acpi/acpi.h>
#include <acpi/acevents.h>

#define _COMPONENT          ACPI_HARDWARE
	 ACPI_MODULE_NAME    ("hwgpe")


/******************************************************************************
 *
 * FUNCTION:    acpi_hw_enable_gpe
 *
 * PARAMETERS:  gpe_event_info      - Info block for the GPE to be enabled
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Enable a single GPE.
 *
 ******************************************************************************/

acpi_status
acpi_hw_enable_gpe (
	struct acpi_gpe_event_info      *gpe_event_info)
{
	u32                             in_byte;
	acpi_status                     status;


	ACPI_FUNCTION_ENTRY ();


	/*
	 * Read the current value of the register, set the appropriate bit
	 * to enable the GPE, and write out the new register.
	 */
	status = acpi_hw_low_level_read (8, &in_byte,
			  &gpe_event_info->register_info->enable_address);
	if (ACPI_FAILURE (status)) {
		return (status);
	}

	/* Write with the new GPE bit enabled */

	status = acpi_hw_low_level_write (8, (in_byte | gpe_event_info->bit_mask),
			  &gpe_event_info->register_info->enable_address);

	return (status);
}


/******************************************************************************
 *
 * FUNCTION:    acpi_hw_enable_gpe_for_wakeup
 *
 * PARAMETERS:  gpe_event_info      - Info block for the GPE to be enabled
 *
 * RETURN:      None
 *
 * DESCRIPTION: Keep track of which GPEs the OS has requested not be
 *              disabled when going to sleep.
 *
 ******************************************************************************/

void
acpi_hw_enable_gpe_for_wakeup (
	struct acpi_gpe_event_info      *gpe_event_info)
{
	struct acpi_gpe_register_info   *gpe_register_info;


	ACPI_FUNCTION_ENTRY ();


	/* Get the info block for the entire GPE register */

	gpe_register_info = gpe_event_info->register_info;
	if (!gpe_register_info) {
		return;
	}

	/*
	 * Set the bit so we will not enable this GPE when sleeping (and disable
	 * it upon wake)
	 */
	gpe_register_info->wake_enable |= gpe_event_info->bit_mask;
	gpe_event_info->flags |= (ACPI_GPE_TYPE_WAKE | ACPI_GPE_ENABLED);
}


/******************************************************************************
 *
 * FUNCTION:    acpi_hw_disable_gpe
 *
 * PARAMETERS:  gpe_event_info      - Info block for the GPE to be disabled
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Disable a single GPE.
 *
 ******************************************************************************/

acpi_status
acpi_hw_disable_gpe (
	struct acpi_gpe_event_info      *gpe_event_info)
{
	u32                             in_byte;
	acpi_status                     status;
	struct acpi_gpe_register_info   *gpe_register_info;


	ACPI_FUNCTION_ENTRY ();


	/* Get the info block for the entire GPE register */

	gpe_register_info = gpe_event_info->register_info;
	if (!gpe_register_info) {
		return (AE_BAD_PARAMETER);
	}

	/*
	 * Read the current value of the register, clear the appropriate bit,
	 * and write out the new register value to disable the GPE.
	 */
	status = acpi_hw_low_level_read (8, &in_byte,
			  &gpe_register_info->enable_address);
	if (ACPI_FAILURE (status)) {
		return (status);
	}

	/* Write the byte with this GPE bit cleared */

	status = acpi_hw_low_level_write (8, (in_byte & ~(gpe_event_info->bit_mask)),
			  &gpe_register_info->enable_address);
	if (ACPI_FAILURE (status)) {
		return (status);
	}

	/* Make sure this GPE is disabled for wake, also */

	acpi_hw_disable_gpe_for_wakeup (gpe_event_info);
	return (AE_OK);
}


/******************************************************************************
 *
 * FUNCTION:    acpi_hw_disable_gpe_for_wakeup
 *
 * PARAMETERS:  gpe_event_info      - Info block for the GPE to be disabled
 *
 * RETURN:      None
 *
 * DESCRIPTION: Keep track of which GPEs the OS has requested not be
 *              disabled when going to sleep.
 *
 ******************************************************************************/

void
acpi_hw_disable_gpe_for_wakeup (
	struct acpi_gpe_event_info      *gpe_event_info)
{
	struct acpi_gpe_register_info   *gpe_register_info;


	ACPI_FUNCTION_ENTRY ();


	/* Get the info block for the entire GPE register */

	gpe_register_info = gpe_event_info->register_info;
	if (!gpe_register_info) {
		return;
	}

	/* Clear the bit so we will disable this when sleeping */

	gpe_register_info->wake_enable &= ~(gpe_event_info->bit_mask);
}


/******************************************************************************
 *
 * FUNCTION:    acpi_hw_clear_gpe
 *
 * PARAMETERS:  gpe_event_info      - Info block for the GPE to be cleared
 *
 * RETURN:      status_status
 *
 * DESCRIPTION: Clear the status bit for a single GPE.
 *
 ******************************************************************************/

acpi_status
acpi_hw_clear_gpe (
	struct acpi_gpe_event_info      *gpe_event_info)
{
	acpi_status                     status;


	ACPI_FUNCTION_ENTRY ();


	/*
	 * Write a one to the appropriate bit in the status register to
	 * clear this GPE.
	 */
	status = acpi_hw_low_level_write (8, gpe_event_info->bit_mask,
			  &gpe_event_info->register_info->status_address);

	return (status);
}


/******************************************************************************
 *
 * FUNCTION:    acpi_hw_get_gpe_status
 *
 * PARAMETERS:  gpe_event_info      - Info block for the GPE to queried
 *              event_status        - Where the GPE status is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Return the status of a single GPE.
 *
 ******************************************************************************/

acpi_status
acpi_hw_get_gpe_status (
	struct acpi_gpe_event_info      *gpe_event_info,
	acpi_event_status               *event_status)
{
	u32                             in_byte;
	u8                              bit_mask;
	struct acpi_gpe_register_info   *gpe_register_info;
	acpi_status                     status;
	acpi_event_status               local_event_status = 0;


	ACPI_FUNCTION_ENTRY ();


	if (!event_status) {
		return (AE_BAD_PARAMETER);
	}

	/* Get the info block for the entire GPE register */

	gpe_register_info = gpe_event_info->register_info;

	/* Get the register bitmask for this GPE */

	bit_mask = gpe_event_info->bit_mask;

	/* GPE Enabled? */

	status = acpi_hw_low_level_read (8, &in_byte, &gpe_register_info->enable_address);