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/******************************************************************************
*
* Module Name: hwgpe - Low level GPE enable/disable/clear functions
* $Revision: 28 $
*
*****************************************************************************/
/*
* Copyright (C) 2000, 2001 R. Byron Moore
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "acpi.h"
#include "achware.h"
#include "acnamesp.h"
#include "acevents.h"
#define _COMPONENT HARDWARE
MODULE_NAME ("hwgpe")
/******************************************************************************
*
* FUNCTION: Acpi_hw_enable_gpe
*
* PARAMETERS: Gpe_number - The GPE
*
* RETURN: None
*
* DESCRIPTION: Enable a single GPE.
*
******************************************************************************/
void
acpi_hw_enable_gpe (
u32 gpe_number)
{
u8 in_byte;
u32 register_index;
u8 bit_mask;
/*
* Translate GPE number to index into global registers array.
*/
register_index = acpi_gbl_gpe_valid[gpe_number];
/*
* Figure out the bit offset for this GPE within the target register.
*/
bit_mask = acpi_gbl_decode_to8bit [MOD_8 (gpe_number)];
/*
* Read the current value of the register, set the appropriate bit
* to enable the GPE, and write out the new register.
*/
in_byte = acpi_os_in8 (acpi_gbl_gpe_registers[register_index].enable_addr);
acpi_os_out8 (acpi_gbl_gpe_registers[register_index].enable_addr,
(u8)(in_byte | bit_mask));
}
/******************************************************************************
*
* FUNCTION: Acpi_hw_disable_gpe
*
* PARAMETERS: Gpe_number - The GPE
*
* RETURN: None
*
* DESCRIPTION: Disable a single GPE.
*
******************************************************************************/
void
acpi_hw_disable_gpe (
u32 gpe_number)
{
u8 in_byte;
u32 register_index;
u8 bit_mask;
/*
* Translate GPE number to index into global registers array.
*/
register_index = acpi_gbl_gpe_valid[gpe_number];
/*
* Figure out the bit offset for this GPE within the target register.
*/
bit_mask = acpi_gbl_decode_to8bit [MOD_8 (gpe_number)];
/*
* Read the current value of the register, clear the appropriate bit,
* and write out the new register value to disable the GPE.
*/
in_byte = acpi_os_in8 (acpi_gbl_gpe_registers[register_index].enable_addr);
acpi_os_out8 (acpi_gbl_gpe_registers[register_index].enable_addr,
(u8)(in_byte & ~bit_mask));
}
/******************************************************************************
*
* FUNCTION: Acpi_hw_clear_gpe
*
* PARAMETERS: Gpe_number - The GPE
*
* RETURN: None
*
* DESCRIPTION: Clear a single GPE.
*
******************************************************************************/
void
acpi_hw_clear_gpe (
u32 gpe_number)
{
u32 register_index;
u8 bit_mask;
/*
* Translate GPE number to index into global registers array.
*/
register_index = acpi_gbl_gpe_valid[gpe_number];
/*
* Figure out the bit offset for this GPE within the target register.
*/
bit_mask = acpi_gbl_decode_to8bit [MOD_8 (gpe_number)];
/*
* Write a one to the appropriate bit in the status register to
* clear this GPE.
*/
acpi_os_out8 (acpi_gbl_gpe_registers[register_index].status_addr, bit_mask);
}
/******************************************************************************
*
* FUNCTION: Acpi_hw_get_gpe_status
*
* PARAMETERS: Gpe_number - The GPE
*
* RETURN: None
*
* DESCRIPTION: Return the status of a single GPE.
*
******************************************************************************/
void
acpi_hw_get_gpe_status (
u32 gpe_number,
ACPI_EVENT_STATUS *event_status)
{
u8 in_byte = 0;
u32 register_index = 0;
u8 bit_mask = 0;
if (!event_status) {
return;
}
(*event_status) = 0;
/*
* Translate GPE number to index into global registers array.
*/
register_index = acpi_gbl_gpe_valid[gpe_number];
/*
* Figure out the bit offset for this GPE within the target register.
*/
bit_mask = acpi_gbl_decode_to8bit [MOD_8 (gpe_number)];
/*
* Enabled?:
*/
in_byte = acpi_os_in8 (acpi_gbl_gpe_registers[register_index].enable_addr);
if (bit_mask & in_byte) {
(*event_status) |= ACPI_EVENT_FLAG_ENABLED;
}
/*
* Set?
*/
in_byte = acpi_os_in8 (acpi_gbl_gpe_registers[register_index].status_addr);
if (bit_mask & in_byte) {
(*event_status) |= ACPI_EVENT_FLAG_SET;
}
}
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