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-rw-r--r--drivers/acpi/utils.c423
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);
+