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linux/drivers/acpi/utils.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

424 lines
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/*
* 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_COMPONENT
ACPI_MODULE_NAME ("acpi_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)
#endif
acpi_status
acpi_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;
ACPI_FUNCTION_TRACE("acpi_extract_package");
if (!package || (package->type != ACPI_TYPE_PACKAGE) || (package->package.count < 1)) {
ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid 'package' argument\n"));
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
if (!format || !format->pointer || (format->length < 1)) {
ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid 'format' argument\n"));
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
if (!buffer) {
ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid 'buffer' argument\n"));
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
format_count = (format->length/sizeof(char)) - 1;
if (format_count > package->package.count) {
ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Format specifies more objects [%d] than exist in package [%d].", format_count, package->package.count));
return_ACPI_STATUS(AE_BAD_DATA);
}
format_string = (char*)format->pointer;
/*
* Calculate size_required.
*/
for (i=0; i<format_count; i++) {
union acpi_object *element = &(package->package.elements[i]);
if (!element) {
return_ACPI_STATUS(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:
ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid package element [%d]: got number, expecing [%c].\n", i, format_string[i]));
return_ACPI_STATUS(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:
ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid package element [%d] got string/buffer, expecing [%c].\n", i, format_string[i]));
return_ACPI_STATUS(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_ACPI_STATUS(AE_SUPPORT);
break;
}
}
/*
* Validate output buffer.
*/
if (buffer->length < size_required) {
buffer->length = size_required;
return_ACPI_STATUS(AE_BUFFER_OVERFLOW);
}
else if (buffer->length != size_required || !buffer->pointer) {
return_ACPI_STATUS(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_ACPI_STATUS(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_ACPI_STATUS(AE_OK);
}
EXPORT_SYMBOL(acpi_extract_package);
acpi_status
acpi_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};
ACPI_FUNCTION_TRACE("acpi_evaluate_integer");
if (!data)
return_ACPI_STATUS(AE_BAD_PARAMETER);
element = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
if(!element)
return_ACPI_STATUS(AE_NO_MEMORY);
memset(element, 0, sizeof(union acpi_object));
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_ACPI_STATUS(status);
}
if (element->type != ACPI_TYPE_INTEGER) {
acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
return_ACPI_STATUS(AE_BAD_DATA);
}
*data = element->integer.value;
kfree(element);
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%lu]\n", *data));
return_ACPI_STATUS(AE_OK);
}
EXPORT_SYMBOL(acpi_evaluate_integer);
#if 0
acpi_status
acpi_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};
ACPI_FUNCTION_TRACE("acpi_evaluate_string");
if (!data)
return_ACPI_STATUS(AE_BAD_PARAMETER);
status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
if (ACPI_FAILURE(status)) {
acpi_util_eval_error(handle, pathname, status);
return_ACPI_STATUS(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_ACPI_STATUS(AE_BAD_DATA);
}
*data = kmalloc(element->string.length + 1, GFP_KERNEL);
if (!data) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Memory allocation error\n"));
return_VALUE(-ENOMEM);
}
memset(*data, 0, element->string.length + 1);
memcpy(*data, element->string.pointer, element->string.length);
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%s]\n", *data));
acpi_os_free(buffer.pointer);
return_ACPI_STATUS(AE_OK);
}
#endif
acpi_status
acpi_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;
ACPI_FUNCTION_TRACE("acpi_evaluate_reference");
if (!list) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Evaluate object. */
status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
if (ACPI_FAILURE(status))
goto end;
package = (union acpi_object *) buffer.pointer;
if ((buffer.length == 0) || !package) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"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) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"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) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"[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_ACPI_STATUS(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;
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"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);
}
acpi_os_free(buffer.pointer);
return_ACPI_STATUS(status);
}
EXPORT_SYMBOL(acpi_evaluate_reference);
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