ACPICA: Return object repair: Add string-to-unicode conversion

Used for the _STR and _MLS predefined names.  Lv Zheng.

Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

3 files changed, 75 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/acnamesp.h b/drivers/acpi/acpica/acnamesp.h
index 7156bc75ebe0..b6ee5192f2ae 100644
--- a/drivers/acpi/acpica/acnamesp.h
+++ b/drivers/acpi/acpica/acnamesp.h
@@ -181,6 +181,10 @@ acpi_status
 acpi_ns_convert_to_buffer(union acpi_operand_object *original_object,
                           union acpi_operand_object **return_object);
 
+acpi_status
+acpi_ns_convert_to_unicode(union acpi_operand_object *original_object,
+                           union acpi_operand_object **return_object);
+
 /*
  * nsdump - Namespace dump/print utilities
  */
diff --git a/drivers/acpi/acpica/nsconvert.c b/drivers/acpi/acpica/nsconvert.c
index fcb7dfb494cd..84f66994256f 100644
--- a/drivers/acpi/acpica/nsconvert.c
+++ b/drivers/acpi/acpica/nsconvert.c
@@ -300,3 +300,67 @@ acpi_ns_convert_to_buffer(union acpi_operand_object *original_object,
         *return_object = new_object;
         return (AE_OK);
 }
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_convert_to_unicode
+ *
+ * PARAMETERS:  original_object     - ASCII String Object to be converted
+ *              return_object       - Where the new converted object is returned
+ *
+ * RETURN:      Status. AE_OK if conversion was successful.
+ *
+ * DESCRIPTION: Attempt to convert a String object to a Unicode string Buffer.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ns_convert_to_unicode(union acpi_operand_object *original_object,
+                           union acpi_operand_object **return_object)
+{
+        union acpi_operand_object *new_object;
+        char *ascii_string;
+        u16 *unicode_buffer;
+        u32 unicode_length;
+        u32 i;
+
+        if (!original_object) {
+                return (AE_OK);
+        }
+
+        /* If a Buffer was returned, it must be at least two bytes long */
+
+        if (original_object->common.type == ACPI_TYPE_BUFFER) {
+                if (original_object->buffer.length < 2) {
+                        return (AE_AML_OPERAND_VALUE);
+                }
+
+                *return_object = NULL;
+                return (AE_OK);
+        }
+
+        /*
+         * The original object is an ASCII string. Convert this string to
+         * a unicode buffer.
+         */
+        ascii_string = original_object->string.pointer;
+        unicode_length = (original_object->string.length * 2) + 2;
+
+        /* Create a new buffer object for the Unicode data */
+
+        new_object = acpi_ut_create_buffer_object(unicode_length);
+        if (!new_object) {
+                return (AE_NO_MEMORY);
+        }
+
+        unicode_buffer = ACPI_CAST_PTR(u16, new_object->buffer.pointer);
+
+        /* Convert ASCII to Unicode */
+
+        for (i = 0; i < original_object->string.length; i++) {
+                unicode_buffer[i] = (u16)ascii_string[i];
+        }
+
+        *return_object = new_object;
+        return (AE_OK);
+}
diff --git a/drivers/acpi/acpica/nsrepair.c b/drivers/acpi/acpica/nsrepair.c
index c5e828f4ed0b..a1918fdf92f2 100644
--- a/drivers/acpi/acpica/nsrepair.c
+++ b/drivers/acpi/acpica/nsrepair.c
@@ -98,6 +98,13 @@ static const struct acpi_simple_repair_info *acpi_ns_match_simple_repair(struct
  * 2nd argument: Unexpected types that can be repaired
  */
 static const struct acpi_simple_repair_info acpi_object_repair_info[] = {
+        /* Unicode conversions */
+
+        {"_MLS", ACPI_RTYPE_STRING, 1,
+         acpi_ns_convert_to_unicode},
+        {"_STR", ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER,
+         ACPI_NOT_PACKAGE_ELEMENT,
+         acpi_ns_convert_to_unicode},
         {{0, 0, 0, 0}, 0, 0, NULL}      /* Table terminator */
 };