diff options
Diffstat (limited to 'drivers/acpi/utils.c')
| -rw-r--r-- | drivers/acpi/utils.c | 423 |
1 files changed, 423 insertions, 0 deletions
diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c new file mode 100644 index 000000000000..1ce2047c3804 --- /dev/null +++ b/drivers/acpi/utils.c @@ -0,0 +1,423 @@ +/* + * 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); + |