/****************************************************************************** * * Module Name: evxfevnt - External Interfaces, ACPI event disable/enable * *****************************************************************************/ /* * Copyright (C) 2000 - 2012, Intel Corp. * 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/export.h> #include <acpi/acpi.h> #include "accommon.h" #include "actables.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; int retry; ACPI_FUNCTION_TRACE(acpi_enable); /* ACPI tables must be present */ if (!acpi_tb_tables_loaded()) { return_ACPI_STATUS(AE_NO_ACPI_TABLES); } /* Check current mode */ if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) { ACPI_DEBUG_PRINT((ACPI_DB_INIT, "System is already in ACPI mode\n")); return_ACPI_STATUS(AE_OK); } /* Transition to ACPI mode */ status = acpi_hw_set_mode(ACPI_SYS_MODE_ACPI); if (ACPI_FAILURE(status)) { ACPI_ERROR((AE_INFO, "Could not transition to ACPI mode")); return_ACPI_STATUS(status); } /* Sanity check that transition succeeded */ for (retry = 0; retry < 30000; ++retry) { if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) { if (retry != 0) ACPI_WARNING((AE_INFO, "Platform took > %d00 usec to enter ACPI mode", retry)); return_ACPI_STATUS(AE_OK); } acpi_os_stall(100); /* 100 usec */ } ACPI_ERROR((AE_INFO, "Hardware did not enter ACPI mode")); return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); } ACPI_EXPORT_SYMBOL(acpi_enable) /******************************************************************************* * * 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_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_ERROR((AE_INFO, "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); } ACPI_EXPORT_SYMBOL(acpi_disable) /******************************************************************************* * * 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_write_bit_register(acpi_gbl_fixed_event_info[event]. enable_register_id, ACPI_ENABLE_EVENT); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* Make sure that the hardware responded */ status = acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. enable_register_id, &value); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } if (value != 1) { ACPI_ERROR((AE_INFO, "Could not enable %s event", acpi_ut_get_event_name(event))); return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); } return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL(acpi_enable_event) /******************************************************************************* * * 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); /* Decode the Fixed Event */ if (event > ACPI_EVENT_MAX) { return_ACPI_STATUS(AE_BAD_PARAMETER); } /* * Disable the requested fixed event (by writing a zero to the enable * register bit) */ status = acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. enable_register_id, ACPI_DISABLE_EVENT); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } status = acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. enable_register_id, &value); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } if (value != 0) { ACPI_ERROR((AE_INFO, "Could not disable %s events", acpi_ut_get_event_name(event))); return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); } return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL(acpi_disable_event) /******************************************************************************* * * FUNCTION: acpi_clear_event * * PARAMETERS: Event - The fixed event to be cleared * * RETURN: Status * * DESCRIPTION: Clear an ACPI event (fixed) * ******************************************************************************/ acpi_status acpi_clear_event(u32 event) { acpi_status status = AE_OK; ACPI_FUNCTION_TRACE(acpi_clear_event); /* Decode the Fixed Event */ if (event > ACPI_EVENT_MAX) { return_ACPI_STATUS(AE_BAD_PARAMETER); } /* * Clear the requested fixed event (By writing a one to the status * register bit) */ status = acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. status_register_id, ACPI_CLEAR_STATUS); return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL(acpi_clear_event) /******************************************************************************* * * FUNCTION: acpi_get_event_status * * PARAMETERS: Event - The fixed event * event_status - Where the current status of the event will * be returned * * RETURN: Status * * DESCRIPTION: Obtains and returns the current status of the event * ******************************************************************************/ acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status) { acpi_status status = AE_OK; u32 value; ACPI_FUNCTION_TRACE(acpi_get_event_status); if (!event_status) { return_ACPI_STATUS(AE_BAD_PARAMETER); } /* Decode the Fixed Event */ if (event > ACPI_EVENT_MAX) { return_ACPI_STATUS(AE_BAD_PARAMETER); } /* Get the status of the requested fixed event */ status = acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. enable_register_id, &value); if (ACPI_FAILURE(status)) return_ACPI_STATUS(status); *event_status = value; status = acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. status_register_id, &value); if (ACPI_FAILURE(status)) return_ACPI_STATUS(status); if (value) *event_status |= ACPI_EVENT_FLAG_SET; if (acpi_gbl_fixed_event_handlers[event].handler) *event_status |= ACPI_EVENT_FLAG_HANDLE; return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL(acpi_get_event_status)