/* *  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/slab.h>#include <linux/init.h>#include <linux/types.h>#include <linux/hardirq.h>#include <linux/acpi.h>#include <acpi/acpi_bus.h>#include <acpi/acpi_drivers.h> #include "internal.h" #define _COMPONENT		ACPI_BUS_COMPONENTACPI_MODULE_NAME("utils"); /* --------------------------------------------------------------------------                            Object Evaluation Helpers   -------------------------------------------------------------------------- */static voidacpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s){#ifdef ACPI_DEBUG_OUTPUT	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	return;#endif} acpi_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(u64);				tail_offset += sizeof(u64);				break;			case 'S':				size_required +=				    sizeof(char *) + sizeof(u64) +				    sizeof(char);				tail_offset += sizeof(char *);				break;			default:				printk(KERN_WARNING PREFIX "Invalid package element"					      " [%d]: got number, expecting"					      " [%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,"					      " expecting [%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 == ACPI_ALLOCATE_BUFFER) {		buffer->pointer = ACPI_ALLOCATE(size_required);		if (!buffer->pointer)			return AE_NO_MEMORY;		buffer->length = size_required;		memset(buffer->pointer, 0, size_required);	} else {		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':				*((u64 *) head) =				    element->integer.value;				head += sizeof(u64);				break;			case 'S':				pointer = (u8 **) head;				*pointer = tail;				*((u64 *) tail) =				    element->integer.value;				head += sizeof(u64 *);				tail += sizeof(u64);				/* 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 long *data){	acpi_status status = AE_OK;	union acpi_object element;	struct acpi_buffer buffer = { 0, NULL }; 	if (!data)		return AE_BAD_PARAMETER; 	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);		return status;	} 	if (element.type != ACPI_TYPE_INTEGER) {		acpi_util_eval_error(handle, pathname, AE_BAD_DATA);		return AE_BAD_DATA;	} 	*data = element.integer.value; 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%llu]\n", *data)); 	return AE_OK;} EXPORT_SYMBOL(acpi_evaluate_integer); 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_LOCAL_REFERENCE) {			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;		} 		if (!element->reference.handle) {			printk(KERN_WARNING PREFIX "Invalid reference in"			       " package %s\n", pathname);			status = AE_NULL_ENTRY;			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); acpi_statusacpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld){	acpi_status status;	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };	union acpi_object *output; 	status = acpi_evaluate_object(handle, "_PLD", NULL, &buffer); 	if (ACPI_FAILURE(status))		return status; 	output = buffer.pointer; 	if (!output || output->type != ACPI_TYPE_PACKAGE	    || !output->package.count	    || output->package.elements[0].type != ACPI_TYPE_BUFFER	    || output->package.elements[0].buffer.length < ACPI_PLD_REV1_BUFFER_SIZE) {		status = AE_TYPE;		goto out;	} 	status = acpi_decode_pld_buffer(			output->package.elements[0].buffer.pointer,			output->package.elements[0].buffer.length,			pld); out:	kfree(buffer.pointer);	return status;}EXPORT_SYMBOL(acpi_get_physical_device_location); /** * acpi_evaluate_hotplug_ost: Evaluate _OST for hotplug operations * @handle: ACPI device handle * @source_event: source event code * @status_code: status code * @status_buf: optional detailed information (NULL if none) * * Evaluate _OST for hotplug operations. All ACPI hotplug handlers * must call this function when evaluating _OST for hotplug operations. * When the platform does not support _OST, this function has no effect. */acpi_statusacpi_evaluate_hotplug_ost(acpi_handle handle, u32 source_event,		u32 status_code, struct acpi_buffer *status_buf){#ifdef ACPI_HOTPLUG_OST	union acpi_object params[3] = {		{.type = ACPI_TYPE_INTEGER,},		{.type = ACPI_TYPE_INTEGER,},		{.type = ACPI_TYPE_BUFFER,}	};	struct acpi_object_list arg_list = {3, params};	acpi_status status; 	params[0].integer.value = source_event;	params[1].integer.value = status_code;	if (status_buf != NULL) {		params[2].buffer.pointer = status_buf->pointer;		params[2].buffer.length = status_buf->length;	} else {		params[2].buffer.pointer = NULL;		params[2].buffer.length = 0;	} 	status = acpi_evaluate_object(handle, "_OST", &arg_list, NULL);	return status;#else	return AE_OK;#endif}EXPORT_SYMBOL(acpi_evaluate_hotplug_ost); /** * acpi_handle_printk: Print message with ACPI prefix and object path * * This function is called through acpi_handle_<level> macros and prints * a message with ACPI prefix and object path.  This function acquires * the global namespace mutex to obtain an object path.  In interrupt * context, it shows the object path as <n/a>. */voidacpi_handle_printk(const char *level, acpi_handle handle, const char *fmt, ...){	struct va_format vaf;	va_list args;	struct acpi_buffer buffer = {		.length = ACPI_ALLOCATE_BUFFER,		.pointer = NULL	};	const char *path; 	va_start(args, fmt);	vaf.fmt = fmt;	vaf.va = &args; 	if (in_interrupt() ||	    acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer) != AE_OK)		path = "<n/a>";	else		path = buffer.pointer; 

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