From: Bob Moore <robert.moore@xxxxxxxxx>
New file: exserial.c
Signed-off-by: Bob Moore <robert.moore@xxxxxxxxx>
Signed-off-by: Erik Schmauss <erik.schmauss@xxxxxxxxx>
---
drivers/acpi/acpica/Makefile | 1 +
drivers/acpi/acpica/acinterp.h | 20 ++
drivers/acpi/acpica/exfield.c | 364 ---------------------------------
drivers/acpi/acpica/exserial.c | 360 ++++++++++++++++++++++++++++++++
4 files changed, 381 insertions(+), 364 deletions(-)
create mode 100644 drivers/acpi/acpica/exserial.c
diff --git a/drivers/acpi/acpica/Makefile b/drivers/acpi/acpica/Makefile
index 71f6f2624deb..b14621da5413 100644
--- a/drivers/acpi/acpica/Makefile
+++ b/drivers/acpi/acpica/Makefile
@@ -65,6 +65,7 @@ acpi-y += \
exresnte.o \
exresolv.o \
exresop.o \
+ exserial.o \
exstore.o \
exstoren.o \
exstorob.o \
diff --git a/drivers/acpi/acpica/acinterp.h b/drivers/acpi/acpica/acinterp.h
index 6a53d3bd99c0..c5b2be0b6613 100644
--- a/drivers/acpi/acpica/acinterp.h
+++ b/drivers/acpi/acpica/acinterp.h
@@ -270,6 +270,26 @@ acpi_ex_prep_common_field_object(union acpi_operand_object *obj_desc,
acpi_status acpi_ex_prep_field_value(struct acpi_create_field_info *info);
+/*
+ * exserial - field_unit support for serial address spaces
+ */
+acpi_status
+acpi_ex_read_serial_bus(union acpi_operand_object *obj_desc,
+ union acpi_operand_object **return_buffer);
+
+acpi_status
+acpi_ex_write_serial_bus(union acpi_operand_object *source_desc,
+ union acpi_operand_object *obj_desc,
+ union acpi_operand_object **return_buffer);
+
+acpi_status
+acpi_ex_read_gpio(union acpi_operand_object *obj_desc, void *buffer);
+
+acpi_status
+acpi_ex_write_gpio(union acpi_operand_object *source_desc,
+ union acpi_operand_object *obj_desc,
+ union acpi_operand_object **return_buffer);
+
/*
* exsystem - Interface to OS services
*/
diff --git a/drivers/acpi/acpica/exfield.c b/drivers/acpi/acpica/exfield.c
index f3e5e988e219..e5798f15793a 100644
--- a/drivers/acpi/acpica/exfield.c
+++ b/drivers/acpi/acpica/exfield.c
@@ -16,31 +16,12 @@
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME("exfield")
-/* Local prototypes */
-static acpi_status
-acpi_ex_read_serial_bus(union acpi_operand_object *obj_desc,
- union acpi_operand_object **return_buffer);
-
-static acpi_status
-acpi_ex_write_serial_bus(union acpi_operand_object *source_desc,
- union acpi_operand_object *obj_desc,
- union acpi_operand_object **return_buffer);
-
-static acpi_status
-acpi_ex_read_gpio(union acpi_operand_object *obj_desc, void *buffer);
-
-static acpi_status
-acpi_ex_write_gpio(union acpi_operand_object *source_desc,
- union acpi_operand_object *obj_desc,
- union acpi_operand_object **return_buffer);
-
/*
* This table maps the various Attrib protocols to the byte transfer
* length. Used for the generic serial bus.
*/
#define ACPI_INVALID_PROTOCOL_ID 0x80
#define ACPI_MAX_PROTOCOL_ID 0x0F
-
const u8 acpi_protocol_lengths[] = {
ACPI_INVALID_PROTOCOL_ID, /* 0 - reserved */
ACPI_INVALID_PROTOCOL_ID, /* 1 - reserved */
@@ -343,348 +324,3 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
return_ACPI_STATUS(status);
}
-
-/*******************************************************************************
- *
- * FUNCTION: acpi_ex_read_gpio
- *
- * PARAMETERS: obj_desc - The named field to read
- * buffer - Where the return data is returnd
- *
- * RETURN: Status
- *
- * DESCRIPTION: Read from a named field that references a Generic Serial Bus
- * field
- *
- ******************************************************************************/
-
-static acpi_status
-acpi_ex_read_gpio(union acpi_operand_object *obj_desc, void *buffer)
-{
- acpi_status status;
-
- ACPI_FUNCTION_TRACE_PTR(ex_read_gpio, obj_desc);
-
- /*
- * For GPIO (general_purpose_io), the Address will be the bit offset
- * from the previous Connection() operator, making it effectively a
- * pin number index. The bit_length is the length of the field, which
- * is thus the number of pins.
- */
- ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
- "GPIO FieldRead [FROM]: Pin %u Bits %u\n",
- obj_desc->field.pin_number_index,
- obj_desc->field.bit_length));
-
- /* Lock entire transaction if requested */
-
- acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
-
- /* Perform the read */
-
- status = acpi_ex_access_region(obj_desc, 0, (u64 *)buffer, ACPI_READ);
-
- acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
- return_ACPI_STATUS(status);
-}
-
-/*******************************************************************************
- *
- * FUNCTION: acpi_ex_write_gpio
- *
- * PARAMETERS: source_desc - Contains data to write. Expect to be
- * an Integer object.
- * obj_desc - The named field
- * result_desc - Where the return value is returned, if any
- *
- * RETURN: Status
- *
- * DESCRIPTION: Write to a named field that references a General Purpose I/O
- * field.
- *
- ******************************************************************************/
-
-static acpi_status
-acpi_ex_write_gpio(union acpi_operand_object *source_desc,
- union acpi_operand_object *obj_desc,
- union acpi_operand_object **return_buffer)
-{
- acpi_status status;
- void *buffer;
-
- ACPI_FUNCTION_TRACE_PTR(ex_write_gpio, obj_desc);
-
- /*
- * For GPIO (general_purpose_io), we will bypass the entire field
- * mechanism and handoff the bit address and bit width directly to
- * the handler. The Address will be the bit offset
- * from the previous Connection() operator, making it effectively a
- * pin number index. The bit_length is the length of the field, which
- * is thus the number of pins.
- */
- if (source_desc->common.type != ACPI_TYPE_INTEGER) {
- return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
- }
-
- ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
- "GPIO FieldWrite [FROM]: (%s:%X), Value %.8X [TO]: Pin %u Bits %u\n",
- acpi_ut_get_type_name(source_desc->common.type),
- source_desc->common.type,
- (u32)source_desc->integer.value,
- obj_desc->field.pin_number_index,
- obj_desc->field.bit_length));
-
- buffer = &source_desc->integer.value;
-
- /* Lock entire transaction if requested */
-
- acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
-
- /* Perform the write */
-
- status = acpi_ex_access_region(obj_desc, 0, (u64 *)buffer, ACPI_WRITE);
- acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
- return_ACPI_STATUS(status);
-}
-
-/*******************************************************************************
- *
- * FUNCTION: acpi_ex_read_serial_bus
- *
- * PARAMETERS: obj_desc - The named field to read
- * return_buffer - Where the return value is returned, if any
- *
- * RETURN: Status
- *
- * DESCRIPTION: Read from a named field that references a serial bus
- * (SMBus, IPMI, or GSBus).
- *
- ******************************************************************************/
-
-static acpi_status
-acpi_ex_read_serial_bus(union acpi_operand_object *obj_desc,
- union acpi_operand_object **return_buffer)
-{
- acpi_status status;
- u32 buffer_length;
- union acpi_operand_object *buffer_desc;
- u32 function;
- u16 accessor_type;
-
- ACPI_FUNCTION_TRACE_PTR(ex_read_serial_bus, obj_desc);
-
- /*
- * 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 and GSBus protocol value is passed in upper 16-bits
- * of Function
- *
- * Common buffer format:
- * Status; (Byte 0 of the data buffer)
- * Length; (Byte 1 of the data buffer)
- * Data[x-1]: (Bytes 2-x of the arbitrary length data buffer)
- */
- switch (obj_desc->field.region_obj->region.space_id) {
- case ACPI_ADR_SPACE_SMBUS:
-
- buffer_length = ACPI_SMBUS_BUFFER_SIZE;
- function = ACPI_READ | (obj_desc->field.attribute << 16);
- break;
-
- case ACPI_ADR_SPACE_IPMI:
-
- buffer_length = ACPI_IPMI_BUFFER_SIZE;
- function = ACPI_READ;
- break;
-
- case ACPI_ADR_SPACE_GSBUS:
-
- accessor_type = obj_desc->field.attribute;
- if (accessor_type == AML_FIELD_ATTRIB_RAW_PROCESS_BYTES) {
- ACPI_ERROR((AE_INFO,
- "Invalid direct read using bidirectional write-then-read protocol"));
-
- return_ACPI_STATUS(AE_AML_PROTOCOL);
- }
-
- status =
- acpi_ex_get_protocol_buffer_length(accessor_type,
- &buffer_length);
- if (ACPI_FAILURE(status)) {
- ACPI_ERROR((AE_INFO,
- "Invalid protocol ID for GSBus: 0x%4.4X",
- accessor_type));
-
- return_ACPI_STATUS(status);
- }
-
- /* Add header length to get the full size of the buffer */
-
- buffer_length += ACPI_SERIAL_HEADER_SIZE;
- function = ACPI_READ | (accessor_type << 16);
- break;
-
- default:
- return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID);
- }
-
- /* Create the local transfer buffer that is returned to the caller */
-
- buffer_desc = acpi_ut_create_buffer_object(buffer_length);
- if (!buffer_desc) {
- return_ACPI_STATUS(AE_NO_MEMORY);
- }
-
- /* Lock entire transaction if requested */
-
- acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
-
- /* Call the region handler for the write-then-read */
-
- status = acpi_ex_access_region(obj_desc, 0,
- ACPI_CAST_PTR(u64,
- buffer_desc->buffer.
- pointer), function);
- acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
-
- *return_buffer = buffer_desc;
- return_ACPI_STATUS(status);
-}
-
-/*******************************************************************************
- *
- * FUNCTION: acpi_ex_write_serial_bus
- *
- * PARAMETERS: source_desc - Contains data to write
- * obj_desc - The named field
- * return_buffer - Where the return value is returned, if any
- *
- * RETURN: Status
- *
- * DESCRIPTION: Write to a named field that references a serial bus
- * (SMBus, IPMI, GSBus).
- *
- ******************************************************************************/
-
-static acpi_status
-acpi_ex_write_serial_bus(union acpi_operand_object *source_desc,
- union acpi_operand_object *obj_desc,
- union acpi_operand_object **return_buffer)
-{
- acpi_status status;
- u32 buffer_length;
- u32 data_length;
- void *buffer;
- union acpi_operand_object *buffer_desc;
- u32 function;
- u16 accessor_type;
-
- ACPI_FUNCTION_TRACE_PTR(ex_write_serial_bus, obj_desc);
-
- /*
- * 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 bidirectional; on a
- * write, return data is returned in the same buffer.
- *
- * Source must be a buffer of sufficient size, these are fixed size:
- * ACPI_SMBUS_BUFFER_SIZE, or ACPI_IPMI_BUFFER_SIZE.
- *
- * Note: SMBus and GSBus protocol type is passed in upper 16-bits
- * of Function
- *
- * Common buffer format:
- * Status; (Byte 0 of the data buffer)
- * Length; (Byte 1 of the data buffer)
- * Data[x-1]: (Bytes 2-x of the arbitrary length data buffer)
- */
- if (source_desc->common.type != ACPI_TYPE_BUFFER) {
- ACPI_ERROR((AE_INFO,
- "SMBus/IPMI/GenericSerialBus write requires "
- "Buffer, found type %s",
- acpi_ut_get_object_type_name(source_desc)));
-
- return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
- }
-
- switch (obj_desc->field.region_obj->region.space_id) {
- case ACPI_ADR_SPACE_SMBUS:
-
- buffer_length = ACPI_SMBUS_BUFFER_SIZE;
- data_length = ACPI_SMBUS_DATA_SIZE;
- function = ACPI_WRITE | (obj_desc->field.attribute << 16);
- break;
-
- case ACPI_ADR_SPACE_IPMI:
-
- buffer_length = ACPI_IPMI_BUFFER_SIZE;
- data_length = ACPI_IPMI_DATA_SIZE;
- function = ACPI_WRITE;
- break;
-
- case ACPI_ADR_SPACE_GSBUS:
-
- accessor_type = obj_desc->field.attribute;
- status =
- acpi_ex_get_protocol_buffer_length(accessor_type,
- &buffer_length);
- if (ACPI_FAILURE(status)) {
- ACPI_ERROR((AE_INFO,
- "Invalid protocol ID for GSBus: 0x%4.4X",
- accessor_type));
-
- return_ACPI_STATUS(status);
- }
-
- /* Add header length to get the full size of the buffer */
-
- buffer_length += ACPI_SERIAL_HEADER_SIZE;
- data_length = source_desc->buffer.pointer[1];
- function = ACPI_WRITE | (accessor_type << 16);
- break;
-
- default:
- return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID);
- }
-
-#if 0
- OBSOLETE ?
- /* Check for possible buffer overflow */
- if (data_length > source_desc->buffer.length) {
- ACPI_ERROR((AE_INFO,
- "Length in buffer header (%u)(%u) is greater than "
- "the physical buffer length (%u) and will overflow",
- data_length, buffer_length,
- source_desc->buffer.length));
-
- return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
- }
-#endif
-
- /* Create the transfer/bidirectional/return buffer */
-
- buffer_desc = acpi_ut_create_buffer_object(buffer_length);
- if (!buffer_desc) {
- return_ACPI_STATUS(AE_NO_MEMORY);
- }
-
- /* Copy the input buffer data to the transfer buffer */
-
- buffer = buffer_desc->buffer.pointer;
- memcpy(buffer, source_desc->buffer.pointer, data_length);
-
- /* Lock entire transaction if requested */
-
- acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
-
- /*
- * Perform the write (returns status and perhaps data in the
- * same buffer)
- */
- status = acpi_ex_access_region(obj_desc, 0, (u64 *)buffer, function);
- acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
-
- *return_buffer = buffer_desc;
- return_ACPI_STATUS(status);
-}
diff --git a/drivers/acpi/acpica/exserial.c b/drivers/acpi/acpica/exserial.c
new file mode 100644
index 000000000000..0d42f30e5b25
--- /dev/null
+++ b/drivers/acpi/acpica/exserial.c
@@ -0,0 +1,360 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: exserial - field_unit support for serial address spaces
+ *
+ * Copyright (C) 2000 - 2018, Intel Corp.
+ *
+ *****************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "acdispat.h"
+#include "acinterp.h"
+#include "amlcode.h"
+
+#define _COMPONENT ACPI_EXECUTER
+ACPI_MODULE_NAME("exserial")
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_read_gpio
+ *
+ * PARAMETERS: obj_desc - The named field to read
+ * buffer - Where the return data is returnd
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Read from a named field that references a Generic Serial Bus
+ * field
+ *
+ ******************************************************************************/
+acpi_status acpi_ex_read_gpio(union acpi_operand_object *obj_desc, void *buffer)
+{
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE_PTR(ex_read_gpio, obj_desc);
+
+ /*
+ * For GPIO (general_purpose_io), the Address will be the bit offset
+ * from the previous Connection() operator, making it effectively a
+ * pin number index. The bit_length is the length of the field, which
+ * is thus the number of pins.
+ */
+ ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
+ "GPIO FieldRead [FROM]: Pin %u Bits %u\n",
+ obj_desc->field.pin_number_index,
+ obj_desc->field.bit_length));
+
+ /* Lock entire transaction if requested */
+
+ acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
+
+ /* Perform the read */
+
+ status = acpi_ex_access_region(obj_desc, 0, (u64 *)buffer, ACPI_READ);
+
+ acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_write_gpio
+ *
+ * PARAMETERS: source_desc - Contains data to write. Expect to be
+ * an Integer object.
+ * obj_desc - The named field
+ * result_desc - Where the return value is returned, if any
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Write to a named field that references a General Purpose I/O
+ * field.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_write_gpio(union acpi_operand_object *source_desc,
+ union acpi_operand_object *obj_desc,
+ union acpi_operand_object **return_buffer)
+{
+ acpi_status status;
+ void *buffer;
+
+ ACPI_FUNCTION_TRACE_PTR(ex_write_gpio, obj_desc);
+
+ /*
+ * For GPIO (general_purpose_io), we will bypass the entire field
+ * mechanism and handoff the bit address and bit width directly to
+ * the handler. The Address will be the bit offset
+ * from the previous Connection() operator, making it effectively a
+ * pin number index. The bit_length is the length of the field, which
+ * is thus the number of pins.
+ */
+ if (source_desc->common.type != ACPI_TYPE_INTEGER) {
+ return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
+ "GPIO FieldWrite [FROM]: (%s:%X), Value %.8X [TO]: Pin %u Bits %u\n",
+ acpi_ut_get_type_name(source_desc->common.type),
+ source_desc->common.type,
+ (u32)source_desc->integer.value,
+ obj_desc->field.pin_number_index,
+ obj_desc->field.bit_length));
+
+ buffer = &source_desc->integer.value;
+
+ /* Lock entire transaction if requested */
+
+ acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
+
+ /* Perform the write */
+
+ status = acpi_ex_access_region(obj_desc, 0, (u64 *)buffer, ACPI_WRITE);
+ acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_read_serial_bus
+ *
+ * PARAMETERS: obj_desc - The named field to read
+ * return_buffer - Where the return value is returned, if any
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Read from a named field that references a serial bus
+ * (SMBus, IPMI, or GSBus).
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_read_serial_bus(union acpi_operand_object *obj_desc,
+ union acpi_operand_object **return_buffer)
+{
+ acpi_status status;
+ u32 buffer_length;
+ union acpi_operand_object *buffer_desc;
+ u32 function;
+ u16 accessor_type;
+
+ ACPI_FUNCTION_TRACE_PTR(ex_read_serial_bus, obj_desc);
+
+ /*
+ * 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 and GSBus protocol value is passed in upper 16-bits
+ * of Function
+ *
+ * Common buffer format:
+ * Status; (Byte 0 of the data buffer)
+ * Length; (Byte 1 of the data buffer)
+ * Data[x-1]: (Bytes 2-x of the arbitrary length data buffer)
+ */
+ switch (obj_desc->field.region_obj->region.space_id) {
+ case ACPI_ADR_SPACE_SMBUS:
+
+ buffer_length = ACPI_SMBUS_BUFFER_SIZE;
+ function = ACPI_READ | (obj_desc->field.attribute << 16);
+ break;
+
+ case ACPI_ADR_SPACE_IPMI:
+
+ buffer_length = ACPI_IPMI_BUFFER_SIZE;
+ function = ACPI_READ;
+ break;
+
+ case ACPI_ADR_SPACE_GSBUS:
+
+ accessor_type = obj_desc->field.attribute;
+ if (accessor_type == AML_FIELD_ATTRIB_RAW_PROCESS_BYTES) {
+ ACPI_ERROR((AE_INFO,
+ "Invalid direct read using bidirectional write-then-read protocol"));
+
+ return_ACPI_STATUS(AE_AML_PROTOCOL);
+ }
+
+ status =
+ acpi_ex_get_protocol_buffer_length(accessor_type,
+ &buffer_length);
+ if (ACPI_FAILURE(status)) {
+ ACPI_ERROR((AE_INFO,
+ "Invalid protocol ID for GSBus: 0x%4.4X",
+ accessor_type));
+
+ return_ACPI_STATUS(status);
+ }
+
+ /* Add header length to get the full size of the buffer */
+
+ buffer_length += ACPI_SERIAL_HEADER_SIZE;
+ function = ACPI_READ | (accessor_type << 16);
+ break;
+
+ default:
+ return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID);
+ }
+
+ /* Create the local transfer buffer that is returned to the caller */
+
+ buffer_desc = acpi_ut_create_buffer_object(buffer_length);
+ if (!buffer_desc) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ /* Lock entire transaction if requested */
+
+ acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
+
+ /* Call the region handler for the write-then-read */
+
+ status = acpi_ex_access_region(obj_desc, 0,
+ ACPI_CAST_PTR(u64,
+ buffer_desc->buffer.
+ pointer), function);
+ acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
+
+ *return_buffer = buffer_desc;
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_write_serial_bus
+ *
+ * PARAMETERS: source_desc - Contains data to write
+ * obj_desc - The named field
+ * return_buffer - Where the return value is returned, if any
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Write to a named field that references a serial bus
+ * (SMBus, IPMI, GSBus).
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_write_serial_bus(union acpi_operand_object *source_desc,
+ union acpi_operand_object *obj_desc,
+ union acpi_operand_object **return_buffer)
+{
+ acpi_status status;
+ u32 buffer_length;
+ u32 data_length;
+ void *buffer;
+ union acpi_operand_object *buffer_desc;
+ u32 function;
+ u16 accessor_type;
+
+ ACPI_FUNCTION_TRACE_PTR(ex_write_serial_bus, obj_desc);
+
+ /*
+ * 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 bidirectional; on a
+ * write, return data is returned in the same buffer.
+ *
+ * Source must be a buffer of sufficient size, these are fixed size:
+ * ACPI_SMBUS_BUFFER_SIZE, or ACPI_IPMI_BUFFER_SIZE.
+ *
+ * Note: SMBus and GSBus protocol type is passed in upper 16-bits
+ * of Function
+ *
+ * Common buffer format:
+ * Status; (Byte 0 of the data buffer)
+ * Length; (Byte 1 of the data buffer)
+ * Data[x-1]: (Bytes 2-x of the arbitrary length data buffer)
+ */
+ if (source_desc->common.type != ACPI_TYPE_BUFFER) {
+ ACPI_ERROR((AE_INFO,
+ "SMBus/IPMI/GenericSerialBus write requires "
+ "Buffer, found type %s",
+ acpi_ut_get_object_type_name(source_desc)));
+
+ return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
+ }
+
+ switch (obj_desc->field.region_obj->region.space_id) {
+ case ACPI_ADR_SPACE_SMBUS:
+
+ buffer_length = ACPI_SMBUS_BUFFER_SIZE;
+ data_length = ACPI_SMBUS_DATA_SIZE;
+ function = ACPI_WRITE | (obj_desc->field.attribute << 16);
+ break;
+
+ case ACPI_ADR_SPACE_IPMI:
+
+ buffer_length = ACPI_IPMI_BUFFER_SIZE;
+ data_length = ACPI_IPMI_DATA_SIZE;
+ function = ACPI_WRITE;
+ break;
+
+ case ACPI_ADR_SPACE_GSBUS:
+
+ accessor_type = obj_desc->field.attribute;
+ status =
+ acpi_ex_get_protocol_buffer_length(accessor_type,
+ &buffer_length);
+ if (ACPI_FAILURE(status)) {
+ ACPI_ERROR((AE_INFO,
+ "Invalid protocol ID for GSBus: 0x%4.4X",
+ accessor_type));
+
+ return_ACPI_STATUS(status);
+ }
+
+ /* Add header length to get the full size of the buffer */
+
+ buffer_length += ACPI_SERIAL_HEADER_SIZE;
+ data_length = source_desc->buffer.pointer[1];
+ function = ACPI_WRITE | (accessor_type << 16);
+ break;
+
+ default:
+ return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID);
+ }
+
+#if 0
+ OBSOLETE ?
+ /* Check for possible buffer overflow */
+ if (data_length > source_desc->buffer.length) {
+ ACPI_ERROR((AE_INFO,
+ "Length in buffer header (%u)(%u) is greater than "
+ "the physical buffer length (%u) and will overflow",
+ data_length, buffer_length,
+ source_desc->buffer.length));
+
+ return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
+ }
+#endif
+
+ /* Create the transfer/bidirectional/return buffer */
+
+ buffer_desc = acpi_ut_create_buffer_object(buffer_length);
+ if (!buffer_desc) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ /* Copy the input buffer data to the transfer buffer */
+
+ buffer = buffer_desc->buffer.pointer;
+ memcpy(buffer, source_desc->buffer.pointer, data_length);
+
+ /* Lock entire transaction if requested */
+
+ acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
+
+ /*
+ * Perform the write (returns status and perhaps data in the
+ * same buffer)
+ */
+ status = acpi_ex_access_region(obj_desc, 0, (u64 *)buffer, function);
+ acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
+
+ *return_buffer = buffer_desc;
+ return_ACPI_STATUS(status);
+}
--
2.17.1
