/******************************************************************************
 *
 * Module Name: utxface - External interfaces for "global" ACPI functions
 *
 *****************************************************************************/

/*
 * 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>
#include <acpi/acparser.h>
#include <acpi/acdispat.h>
#include <acpi/acdebug.h>

#define _COMPONENT          ACPI_UTILITIES
	 ACPI_MODULE_NAME    ("utxface")


/*******************************************************************************
 *
 * FUNCTION:    acpi_initialize_subsystem
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Initializes all global variables.  This is the first function
 *              called, so any early initialization belongs here.
 *
 ******************************************************************************/

acpi_status
acpi_initialize_subsystem (
	void)
{
	acpi_status                     status;

	ACPI_FUNCTION_TRACE ("acpi_initialize_subsystem");


	ACPI_DEBUG_EXEC (acpi_ut_init_stack_ptr_trace ());


	/* Initialize all globals used by the subsystem */

	acpi_ut_init_globals ();

	/* Initialize the OS-Dependent layer */

	status = acpi_os_initialize ();
	if (ACPI_FAILURE (status)) {
		ACPI_REPORT_ERROR (("OSD failed to initialize, %s\n",
			acpi_format_exception (status)));
		return_ACPI_STATUS (status);
	}

	/* Create the default mutex objects */

	status = acpi_ut_mutex_initialize ();
	if (ACPI_FAILURE (status)) {
		ACPI_REPORT_ERROR (("Global mutex creation failure, %s\n",
			acpi_format_exception (status)));
		return_ACPI_STATUS (status);
	}

	/*
	 * Initialize the namespace manager and
	 * the root of the namespace tree
	 */

	status = acpi_ns_root_initialize ();
	if (ACPI_FAILURE (status)) {
		ACPI_REPORT_ERROR (("Namespace initialization failure, %s\n",
			acpi_format_exception (status)));
		return_ACPI_STATUS (status);
	}


	/* If configured, initialize the AML debugger */

	ACPI_DEBUGGER_EXEC (status = acpi_db_initialize ());

	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_enable_subsystem
 *
 * PARAMETERS:  Flags           - Init/enable Options
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Completes the subsystem initialization including hardware.
 *              Puts system into ACPI mode if it isn't already.
 *
 ******************************************************************************/

acpi_status
acpi_enable_subsystem (
	u32                             flags)
{
	acpi_status                     status = AE_OK;


	ACPI_FUNCTION_TRACE ("acpi_enable_subsystem");


	/*
	 * We must initialize the hardware before we can enable ACPI.
	 * The values from the FADT are validated here.
	 */
	if (!(flags & ACPI_NO_HARDWARE_INIT)) {
		ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Initializing ACPI hardware\n"));

		status = acpi_hw_initialize ();
		if (ACPI_FAILURE (status)) {
			return_ACPI_STATUS (status);
		}
	}

	/* Enable ACPI mode */

	if (!(flags & ACPI_NO_ACPI_ENABLE)) {
		ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Going into ACPI mode\n"));

		acpi_gbl_original_mode = acpi_hw_get_mode();

		status = acpi_enable ();
		if (ACPI_FAILURE (status)) {
			ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "acpi_enable failed.\n"));
			return_ACPI_STATUS (status);
		}
	}

	/*
	 * Install the default op_region handlers. These are installed unless
	 * other handlers have already been installed via the
	 * install_address_space_handler interface.
	 */
	if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
		ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Installing default address space handlers\n"));

		status = acpi_ev_install_region_handlers ();
		if (ACPI_FAILURE (status)) {
			return_ACPI_STATUS (status);
		}
	}

	/*
	 * Initialize ACPI Event handling (Fixed and General Purpose)
	 *
	 * NOTE: We must have the hardware AND events initialized before we can execute
	 * ANY control methods SAFELY.  Any control method can require ACPI hardware
	 * support, so the hardware MUST be initialized before execution!
	 */
	if (!(flags & ACPI_NO_EVENT_INIT)) {
		ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Initializing ACPI events\n"));

		status = acpi_ev_initialize_events ();
		if (ACPI_FAILURE (status)) {
			return_ACPI_STATUS (status);
		}
	}

	/* Install the SCI handler and Global Lock handler */

	if (!(flags & ACPI_NO_HANDLER_INIT)) {
		ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Installing SCI/GL handlers\n"));

		status = acpi_ev_install_xrupt_handlers ();
		if (ACPI_FAILURE (status)) {
			return_ACPI_STATUS (status);
		}
	}

	return_ACPI_STATUS (status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_initialize_objects
 *
 * PARAMETERS:  Flags           - Init/enable Options
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Completes namespace initialization by initializing device
 *              objects and executing AML code for Regions, buffers, etc.
 *
 ******************************************************************************/

acpi_status
acpi_initialize_objects (
	u32                             flags)
{
	acpi_status                     status = AE_OK;


	ACPI_FUNCTION_TRACE ("acpi_initialize_objects");


	/*
	 * Run all _REG methods
	 *
	 * NOTE: Any objects accessed
	 * by the _REG methods will be automatically initialized, even if they
	 * contain executable AML (see call to acpi_ns_initialize_objects below).
	 */
	if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
		ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Executing _REG op_region methods\n"));

		status = acpi_ev_initialize_op_regions ();
		if (ACPI_FAILURE (status)) {
			return_ACPI_STATUS (status);
		}
	}

	/*
	 * Initialize the objects that remain uninitialized.  This
	 * runs the executable AML that may be part of the declaration of these
	 * objects: operation_regions, buffer_fields, Buffers, and Packages.
	 */
	if (!(flags & ACPI_NO_OBJECT_INIT)) {
		ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Completing Initialization of ACPI Objects\n"));

		status = acpi_ns_initialize_objects ();
		if (ACPI_FAILURE (status)) {
			return_ACPI_STATUS (status);
		}
	}

	/*
	 * Initialize all device objects in the namespace
	 * This runs the _STA and _INI methods.
	 */
	if (!(flags & ACPI_NO_DEVICE_INIT)) {
		ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Initializing ACPI Devices\n"));

		status = acpi_ns_initialize_devices ();
		if (ACPI_FAILURE (status)) {
			return_ACPI_STATUS (status);
		}
	}

	/*
	 * Empty the caches (delete the cached objects) on the assumption that
	 * the table load filled them up more than they will be at runtime --
	 * thus wasting non-paged memory.
	 */
	status = acpi_purge_cached_objects ();

	acpi_gbl_startup_flags |= ACPI_INITIALIZED_OK;
	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_terminate
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Shutdown the ACPI subsystem.  Release all resources.
 *
 ******************************************************************************/

acpi_status
acpi_terminate (void)
{
	acpi_status                 status;


	ACPI_FUNCTION_TRACE ("acpi_terminate");


	/* Terminate the AML Debugger if present */

	ACPI_DEBUGGER_EXEC(acpi_gbl_db_terminate_threads = TRUE);

	/* Shutdown and free all resources */

	acpi_ut_subsystem_shutdown ();


	/* Free the mutex objects */

	acpi_ut_mutex_terminate ();


#ifdef ACPI_DEBUGGER

	/* Shut down the debugger */

	acpi_db_terminate ();
#endif

	/* Now we can shutdown the OS-dependent layer */

	status = acpi_os_terminate ();
	return_ACPI_STATUS (status);
}


#ifdef ACPI_FUTURE_USAGE

/*****************************************************************************
 *
 * FUNCTION:    acpi_subsystem_status
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status of the ACPI subsystem
 *
 * DESCRIPTION: Other drivers that use the ACPI subsystem should call this
 *              before making any other calls, to ensure the subsystem initial-
 *              ized successfully.
 *
 ****************************************************************************/

acpi_status
acpi_subsystem_status (void)
{
	if (acpi_gbl_startup_flags & ACPI_INITIALIZED_OK) {
		return (AE_OK);
	}
	else {
		return (AE_ERROR);
	}
}


/******************************************************************************
 *
 * FUNCTION:    acpi_get_system_info
 *
 * PARAMETERS:  out_buffer      - a pointer to a buffer to receive the
 *                                resources for the device
 *              buffer_length   - the number of bytes available in the buffer
 *
 * RETURN:      Status          - the status of the call
 *
 * DESCRIPTION: This function is called to get information about the current
 *              state of the ACPI subsystem.  It will return system information
 *              in the out_buffer.
 *
 *              If the function fails an appropriate status will be returned
 *              and the value of out_buffer is undefined.
 *
 ******************************************************************************/

acpi_status
acpi_get_system_info (
	struct acpi_buffer              *out_buffer)
{
	struct acpi_system_info         *info_ptr;
	u32                             i;
	acpi_status                     status;


	ACPI_FUNCTION_TRACE ("acpi_get_system_info");


	/* Parameter validation */

	status = acpi_ut_validate_buffer (out_buffer);
	if (ACPI_FAILURE (status)) {
		return_ACPI_STATUS (status);
	}

	/* Validate/Allocate/Clear caller buffer */

	status = acpi_ut_initialize_buffer (out_buffer, sizeof (struct acpi_system_info));
	if (ACPI_FAILURE (status)) {
		return_ACPI_STATUS (status);
	}

	/*
	 * Populate the return buffer
	 */
	info_ptr = (struct acpi_system_info *) out_buffer->pointer;

	info_ptr->acpi_ca_version   = ACPI_CA_VERSION;

	/* System flags (ACPI capabilities) */

	info_ptr->flags             = ACPI_SYS_MODE_ACPI;

	/* Timer resolution - 24 or 32 bits  */

	if (!acpi_gbl_FADT) {
		info_ptr->timer_resolution = 0;
	}
	else if (acpi_gbl_FADT->tmr_val_ext == 0) {
		info_ptr->timer_resolution = 24;
	}
	else {
		info_ptr->timer_resolution = 32;
	}

	/* Clear the reserved fields */

	info_ptr->reserved1         = 0;
	info_ptr->reserved2         = 0;

	/* Current debug levels */

	info_ptr->debug_layer       = acpi_dbg_layer;
	info_ptr->debug_level       = acpi_dbg_level;

	/* Current status of the ACPI tables, per table type */

	info_ptr->num_table_types = NUM_ACPI_TABLE_TYPES;
	for (i = 0; i < NUM_ACPI_TABLE_TYPES; i++) {
		info_ptr->table_info[i].count = acpi_gbl_table_lists[i].count;
	}

	return_ACPI_STATUS (AE_OK);
}
EXPORT_SYMBOL(acpi_get_system_info);


/*****************************************************************************
 *
 * FUNCTION:    acpi_install_initialization_handler
 *
 * PARAMETERS:  Handler             - Callback procedure
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Install an initialization handler
 *
 * TBD: When a second function is added, must save the Function also.
 *
 ****************************************************************************/

acpi_status
acpi_install_initialization_handler (
	acpi_init_handler               handler,
	u32                             function)
{

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

	if (acpi_gbl_init_handler) {
		return (AE_ALREADY_EXISTS);
	}

	acpi_gbl_init_handler = handler;
	return AE_OK;
}

#endif  /*  ACPI_FUTURE_USAGE  */


/*****************************************************************************
 *
 * FUNCTION:    acpi_purge_cached_objects
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Empty all caches (delete the cached objects)
 *
 ****************************************************************************/

acpi_status
acpi_purge_cached_objects (void)
{
	ACPI_FUNCTION_TRACE ("acpi_purge_cached_objects");


#ifdef ACPI_ENABLE_OBJECT_CACHE
	acpi_ut_delete_generic_state_cache ();
	acpi_ut_delete_object_cache ();
	acpi_ds_delete_walk_state_cache ();
	acpi_ps_delete_parse_cache ();
#endif

	return_ACPI_STATUS (AE_OK);
}