/* *  acpi_utils.c - ACPI Utility Functions ($Revision: 10 $) * *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * *  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 <linux/kernel.h>#include <linux/module.h>#include <linux/init.h>#include <linux/types.h>#include <acpi/acpi_bus.h>#include <acpi/acpi_drivers.h> #define _COMPONENT		ACPI_BUS_COMPONENTACPI_MODULE_NAME("utils"); /* --------------------------------------------------------------------------                            Object Evaluation Helpers   -------------------------------------------------------------------------- */#ifdef ACPI_DEBUG_OUTPUT#define acpi_util_eval_error(h,p,s) {\	char prefix[80] = {'\0'};\	struct acpi_buffer buffer = {sizeof(prefix), prefix};\	acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer);\	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluate [%s.%s]: %s\n",\		(char *) prefix, p, acpi_format_exception(s))); }#else#define acpi_util_eval_error(h,p,s)#endifacpi_statusacpi_extract_package(union acpi_object *package,		     struct acpi_buffer *format, struct acpi_buffer *buffer){	u32 size_required = 0;	u32 tail_offset = 0;	char *format_string = NULL;	u32 format_count = 0;	u32 i = 0;	u8 *head = NULL;	u8 *tail = NULL;  	if (!package || (package->type != ACPI_TYPE_PACKAGE)	    || (package->package.count < 1)) {		printk(KERN_WARNING PREFIX "Invalid package argument\n");		return AE_BAD_PARAMETER;	} 	if (!format || !format->pointer || (format->length < 1)) {		printk(KERN_WARNING PREFIX "Invalid format argument\n");		return AE_BAD_PARAMETER;	} 	if (!buffer) {		printk(KERN_WARNING PREFIX "Invalid buffer argument\n");		return AE_BAD_PARAMETER;	} 	format_count = (format->length / sizeof(char)) - 1;	if (format_count > package->package.count) {		printk(KERN_WARNING PREFIX "Format specifies more objects [%d]"			      " than exist in package [%d].\n",			      format_count, package->package.count);		return AE_BAD_DATA;	} 	format_string = format->pointer; 	/*	 * Calculate size_required.	 */	for (i = 0; i < format_count; i++) { 		union acpi_object *element = &(package->package.elements[i]); 		if (!element) {			return AE_BAD_DATA;		} 		switch (element->type) { 		case ACPI_TYPE_INTEGER:			switch (format_string[i]) {			case 'N':				size_required += sizeof(acpi_integer);				tail_offset += sizeof(acpi_integer);				break;			case 'S':				size_required +=				    sizeof(char *) + sizeof(acpi_integer) +				    sizeof(char);				tail_offset += sizeof(char *);				break;			default:				printk(KERN_WARNING PREFIX "Invalid package element"					      " [%d]: got number, expecing"					      " [%c]\n",					      i, format_string[i]);				return AE_BAD_DATA;				break;			}			break; 		case ACPI_TYPE_STRING:		case ACPI_TYPE_BUFFER:			switch (format_string[i]) {			case 'S':				size_required +=				    sizeof(char *) +				    (element->string.length * sizeof(char)) +				    sizeof(char);				tail_offset += sizeof(char *);				break;			case 'B':				size_required +=				    sizeof(u8 *) +				    (element->buffer.length * sizeof(u8));				tail_offset += sizeof(u8 *);				break;			default:				printk(KERN_WARNING PREFIX "Invalid package element"					      " [%d] got string/buffer,"					      " expecing [%c]\n",					      i, format_string[i]);				return AE_BAD_DATA;				break;			}			break; 		case ACPI_TYPE_PACKAGE:		default:			ACPI_DEBUG_PRINT((ACPI_DB_INFO,					  "Found unsupported element at index=%d\n",					  i));			/* TBD: handle nested packages... */			return AE_SUPPORT;			break;		}	} 	/*	 * Validate output buffer.	 */	if (buffer->length < size_required) {		buffer->length = size_required;		return AE_BUFFER_OVERFLOW;	} else if (buffer->length != size_required || !buffer->pointer) {		return AE_BAD_PARAMETER;	} 	head = buffer->pointer;	tail = buffer->pointer + tail_offset; 	/*	 * Extract package data.	 */	for (i = 0; i < format_count; i++) { 		u8 **pointer = NULL;		union acpi_object *element = &(package->package.elements[i]); 		if (!element) {			return AE_BAD_DATA;		} 		switch (element->type) { 		case ACPI_TYPE_INTEGER:			switch (format_string[i]) {			case 'N':				*((acpi_integer *) head) =				    element->integer.value;				head += sizeof(acpi_integer);				break;			case 'S':				pointer = (u8 **) head;				*pointer = tail;				*((acpi_integer *) tail) =				    element->integer.value;				head += sizeof(acpi_integer *);				tail += sizeof(acpi_integer);				/* NULL terminate string */				*tail = (char)0;				tail += sizeof(char);				break;			default:				/* Should never get here */				break;			}			break; 		case ACPI_TYPE_STRING:		case ACPI_TYPE_BUFFER:			switch (format_string[i]) {			case 'S':				pointer = (u8 **) head;				*pointer = tail;				memcpy(tail, element->string.pointer,				       element->string.length);				head += sizeof(char *);				tail += element->string.length * sizeof(char);				/* NULL terminate string */				*tail = (char)0;				tail += sizeof(char);				break;			case 'B':				pointer = (u8 **) head;				*pointer = tail;				memcpy(tail, element->buffer.pointer,				       element->buffer.length);				head += sizeof(u8 *);				tail += element->buffer.length * sizeof(u8);				break;			default:				/* Should never get here */				break;			}			break; 		case ACPI_TYPE_PACKAGE:			/* TBD: handle nested packages... */		default:			/* Should never get here */			break;		}	} 	return AE_OK;} EXPORT_SYMBOL(acpi_extract_package); acpi_statusacpi_evaluate_integer(acpi_handle handle,		      acpi_string pathname,		      struct acpi_object_list *arguments, unsigned long *data){	acpi_status status = AE_OK;	union acpi_object *element;	struct acpi_buffer buffer = { 0, NULL };  	if (!data)		return AE_BAD_PARAMETER; 	element = kzalloc(sizeof(union acpi_object), irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL);	if (!element)		return AE_NO_MEMORY; 	buffer.length = sizeof(union acpi_object);	buffer.pointer = element;	status = acpi_evaluate_object(handle, pathname, arguments, &buffer);	if (ACPI_FAILURE(status)) {		acpi_util_eval_error(handle, pathname, status);		kfree(element);		return status;	} 	if (element->type != ACPI_TYPE_INTEGER) {		acpi_util_eval_error(handle, pathname, AE_BAD_DATA);		kfree(element);		return AE_BAD_DATA;	} 	*data = element->integer.value;	kfree(element); 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%lu]\n", *data)); 	return AE_OK;} EXPORT_SYMBOL(acpi_evaluate_integer); #if 0acpi_statusacpi_evaluate_string(acpi_handle handle,		     acpi_string pathname,		     acpi_object_list * arguments, acpi_string * data){	acpi_status status = AE_OK;	acpi_object *element = NULL;	acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };  	if (!data)		return AE_BAD_PARAMETER; 	status = acpi_evaluate_object(handle, pathname, arguments, &buffer);	if (ACPI_FAILURE(status)) {		acpi_util_eval_error(handle, pathname, status);		return status;	} 	element = (acpi_object *) buffer.pointer; 	if ((element->type != ACPI_TYPE_STRING)	    || (element->type != ACPI_TYPE_BUFFER)	    || !element->string.length) {		acpi_util_eval_error(handle, pathname, AE_BAD_DATA);		return AE_BAD_DATA;	} 	*data = kzalloc(element->string.length + 1, GFP_KERNEL);	if (!data) {		printk(KERN_ERR PREFIX "Memory allocation\n");		return -ENOMEM;	} 	memcpy(*data, element->string.pointer, element->string.length); 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%s]\n", *data)); 	kfree(buffer.pointer); 	return AE_OK;}#endif acpi_statusacpi_evaluate_reference(acpi_handle handle,			acpi_string pathname,			struct acpi_object_list *arguments,			struct acpi_handle_list *list){	acpi_status status = AE_OK;	union acpi_object *package = NULL;	union acpi_object *element = NULL;	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };	u32 i = 0;  	if (!list) {		return AE_BAD_PARAMETER;	} 	/* Evaluate object. */ 	status = acpi_evaluate_object(handle, pathname, arguments, &buffer);	if (ACPI_FAILURE(status))		goto end; 	package = buffer.pointer; 	if ((buffer.length == 0) || !package) {		printk(KERN_ERR PREFIX "No return object (len %X ptr %p)\n",			    (unsigned)buffer.length, package);		status = AE_BAD_DATA;		acpi_util_eval_error(handle, pathname, status);		goto end;	}	if (package->type != ACPI_TYPE_PACKAGE) {		printk(KERN_ERR PREFIX "Expecting a [Package], found type %X\n",			    package->type);		status = AE_BAD_DATA;		acpi_util_eval_error(handle, pathname, status);		goto end;	}	if (!package->package.count) {		printk(KERN_ERR PREFIX "[Package] has zero elements (%p)\n",			    package);		status = AE_BAD_DATA;		acpi_util_eval_error(handle, pathname, status);		goto end;	} 	if (package->package.count > ACPI_MAX_HANDLES) {		return AE_NO_MEMORY;	}	list->count = package->package.count; 	/* Extract package data. */ 	for (i = 0; i < list->count; i++) { 		element = &(package->package.elements[i]); 		if (element->type != ACPI_TYPE_ANY) {			status = AE_BAD_DATA;			printk(KERN_ERR PREFIX				    "Expecting a [Reference] package element, found type %X\n",				    element->type);			acpi_util_eval_error(handle, pathname, status);			break;		} 		/* Get the  acpi_handle. */ 		list->handles[i] = element->reference.handle;		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found reference [%p]\n",				  list->handles[i]));	}       end:	if (ACPI_FAILURE(status)) {		list->count = 0;		//kfree(list->handles);	} 	kfree(buffer.pointer); 	return status;} EXPORT_SYMBOL(acpi_evaluate_reference);