1 files changed, 22 insertions, 8 deletions

diff --git a/drivers/acpi/acpica/exfield.c b/drivers/acpi/acpica/exfield.c
index 0bde2230c02..dc092f5b35d 100644
--- a/drivers/acpi/acpica/exfield.c
+++ b/drivers/acpi/acpica/exfield.c
@@ -5,7 +5,7 @@
  *****************************************************************************/
 
 /*
- * Copyright (C) 2000 - 2011, Intel Corp.
+ * Copyright (C) 2000 - 2012, Intel Corp.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -100,18 +100,25 @@ acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
                    (obj_desc->field.region_obj->region.space_id ==
                     ACPI_ADR_SPACE_SMBUS
                     || obj_desc->field.region_obj->region.space_id ==
+                    ACPI_ADR_SPACE_GSBUS
+                    || obj_desc->field.region_obj->region.space_id ==
                     ACPI_ADR_SPACE_IPMI)) {
                 /*
-                 * This is an SMBus or IPMI read. We must create a buffer to hold
+                 * This is an SMBus, GSBus or IPMI read. We must create a buffer to hold
                  * the data and then directly access the region handler.
                  *
-                 * Note: Smbus protocol value is passed in upper 16-bits of Function
+                 * Note: SMBus and GSBus protocol value is passed in upper 16-bits of Function
                  */
                 if (obj_desc->field.region_obj->region.space_id ==
                     ACPI_ADR_SPACE_SMBUS) {
                         length = ACPI_SMBUS_BUFFER_SIZE;
                         function =
                             ACPI_READ | (obj_desc->field.attribute << 16);
+                } else if (obj_desc->field.region_obj->region.space_id ==
+                           ACPI_ADR_SPACE_GSBUS) {
+                        length = ACPI_GSBUS_BUFFER_SIZE;
+                        function =
+                            ACPI_READ | (obj_desc->field.attribute << 16);
                 } else {        /* IPMI */
 
                         length = ACPI_IPMI_BUFFER_SIZE;
@@ -248,21 +255,23 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
                    (obj_desc->field.region_obj->region.space_id ==
                     ACPI_ADR_SPACE_SMBUS
                     || obj_desc->field.region_obj->region.space_id ==
+                    ACPI_ADR_SPACE_GSBUS
+                    || obj_desc->field.region_obj->region.space_id ==
                     ACPI_ADR_SPACE_IPMI)) {
                 /*
-                 * This is an SMBus or IPMI write. We will bypass the entire field
+                 * This is an SMBus, GSBus or IPMI write. We will bypass the entire field
                  * mechanism and handoff the buffer directly to the handler. For
                  * these address spaces, the buffer is bi-directional; on a write,
                  * return data is returned in the same buffer.
                  *
                  * Source must be a buffer of sufficient size:
-                 * ACPI_SMBUS_BUFFER_SIZE or ACPI_IPMI_BUFFER_SIZE.
+                 * ACPI_SMBUS_BUFFER_SIZE, ACPI_GSBUS_BUFFER_SIZE, or ACPI_IPMI_BUFFER_SIZE.
                  *
-                 * Note: SMBus protocol type is passed in upper 16-bits of Function
+                 * Note: SMBus and GSBus protocol type is passed in upper 16-bits of Function
                  */
                 if (source_desc->common.type != ACPI_TYPE_BUFFER) {
                         ACPI_ERROR((AE_INFO,
-                                    "SMBus or IPMI write requires Buffer, found type %s",
+                                    "SMBus/IPMI/GenericSerialBus write requires Buffer, found type %s",
                                     acpi_ut_get_object_type_name(source_desc)));
 
                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
@@ -273,6 +282,11 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
                         length = ACPI_SMBUS_BUFFER_SIZE;
                         function =
                             ACPI_WRITE | (obj_desc->field.attribute << 16);
+                } else if (obj_desc->field.region_obj->region.space_id ==
+                           ACPI_ADR_SPACE_GSBUS) {
+                        length = ACPI_GSBUS_BUFFER_SIZE;
+                        function =
+                            ACPI_WRITE | (obj_desc->field.attribute << 16);
                 } else {        /* IPMI */
 
                         length = ACPI_IPMI_BUFFER_SIZE;
@@ -281,7 +295,7 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
 
                 if (source_desc->buffer.length < length) {
                         ACPI_ERROR((AE_INFO,
-                                    "SMBus or IPMI write requires Buffer of length %u, found length %u",
+                                    "SMBus/IPMI/GenericSerialBus write requires Buffer of length %u, found length %u",
                                     length, source_desc->buffer.length));
 
                         return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);