ACPICA: Move all public H/W interfaces to new hwxface

Move public interfaces from hwregs.c to new file, hwxface.c -
similar to the structure of the other ACPICA components.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

3 files changed, 558 insertions, 497 deletions

diff --git a/drivers/acpi/hardware/Makefile b/drivers/acpi/hardware/Makefile
index 438ad373b9a..238fbe513b8 100644
--- a/drivers/acpi/hardware/Makefile
+++ b/drivers/acpi/hardware/Makefile
@@ -2,7 +2,7 @@
 # Makefile for all Linux ACPI interpreter subdirectories
 #
 
-obj-y := hwacpi.o  hwgpe.o  hwregs.o  hwsleep.o
+obj-y := hwacpi.o  hwgpe.o  hwregs.o  hwsleep.o hwxface.o
 
 obj-$(ACPI_FUTURE_USAGE) += hwtimer.o
 
diff --git a/drivers/acpi/hardware/hwregs.c b/drivers/acpi/hardware/hwregs.c
index d6d2ec6969f..981e5db21a3 100644
--- a/drivers/acpi/hardware/hwregs.c
+++ b/drivers/acpi/hardware/hwregs.c
@@ -56,7 +56,7 @@ ACPI_MODULE_NAME("hwregs")
  *
  * PARAMETERS:  None
  *
- * RETURN:      None
+ * RETURN:      Status
  *
  * DESCRIPTION: Clears all fixed and general purpose status bits
  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
@@ -102,125 +102,6 @@ acpi_status acpi_hw_clear_acpi_status(void)
 
 /*******************************************************************************
  *
- * FUNCTION:    acpi_get_sleep_type_data
- *
- * PARAMETERS:  sleep_state         - Numeric sleep state
- *              *sleep_type_a        - Where SLP_TYPa is returned
- *              *sleep_type_b        - Where SLP_TYPb is returned
- *
- * RETURN:      Status - ACPI status
- *
- * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested sleep
- *              state.
- *
- ******************************************************************************/
-
-acpi_status
-acpi_get_sleep_type_data(u8 sleep_state, u8 * sleep_type_a, u8 * sleep_type_b)
-{
-	acpi_status status = AE_OK;
-	struct acpi_evaluate_info *info;
-
-	ACPI_FUNCTION_TRACE(acpi_get_sleep_type_data);
-
-	/* Validate parameters */
-
-	if ((sleep_state > ACPI_S_STATES_MAX) || !sleep_type_a || !sleep_type_b) {
-		return_ACPI_STATUS(AE_BAD_PARAMETER);
-	}
-
-	/* Allocate the evaluation information block */
-
-	info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
-	if (!info) {
-		return_ACPI_STATUS(AE_NO_MEMORY);
-	}
-
-	info->pathname =
-	    ACPI_CAST_PTR(char, acpi_gbl_sleep_state_names[sleep_state]);
-
-	/* Evaluate the namespace object containing the values for this state */
-
-	status = acpi_ns_evaluate(info);
-	if (ACPI_FAILURE(status)) {
-		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
-				  "%s while evaluating SleepState [%s]\n",
-				  acpi_format_exception(status),
-				  info->pathname));
-
-		goto cleanup;
-	}
-
-	/* Must have a return object */
-
-	if (!info->return_object) {
-		ACPI_ERROR((AE_INFO, "No Sleep State object returned from [%s]",
-			    info->pathname));
-		status = AE_NOT_EXIST;
-	}
-
-	/* It must be of type Package */
-
-	else if (ACPI_GET_OBJECT_TYPE(info->return_object) != ACPI_TYPE_PACKAGE) {
-		ACPI_ERROR((AE_INFO,
-			    "Sleep State return object is not a Package"));
-		status = AE_AML_OPERAND_TYPE;
-	}
-
-	/*
-	 * The package must have at least two elements. NOTE (March 2005): This
-	 * goes against the current ACPI spec which defines this object as a
-	 * package with one encoded DWORD element. However, existing practice
-	 * by BIOS vendors seems to be to have 2 or more elements, at least
-	 * one per sleep type (A/B).
-	 */
-	else if (info->return_object->package.count < 2) {
-		ACPI_ERROR((AE_INFO,
-			    "Sleep State return package does not have at least two elements"));
-		status = AE_AML_NO_OPERAND;
-	}
-
-	/* The first two elements must both be of type Integer */
-
-	else if ((ACPI_GET_OBJECT_TYPE(info->return_object->package.elements[0])
-		  != ACPI_TYPE_INTEGER) ||
-		 (ACPI_GET_OBJECT_TYPE(info->return_object->package.elements[1])
-		  != ACPI_TYPE_INTEGER)) {
-		ACPI_ERROR((AE_INFO,
-			    "Sleep State return package elements are not both Integers (%s, %s)",
-			    acpi_ut_get_object_type_name(info->return_object->
-							 package.elements[0]),
-			    acpi_ut_get_object_type_name(info->return_object->
-							 package.elements[1])));
-		status = AE_AML_OPERAND_TYPE;
-	} else {
-		/* Valid _Sx_ package size, type, and value */
-
-		*sleep_type_a = (u8)
-		    (info->return_object->package.elements[0])->integer.value;
-		*sleep_type_b = (u8)
-		    (info->return_object->package.elements[1])->integer.value;
-	}
-
-	if (ACPI_FAILURE(status)) {
-		ACPI_EXCEPTION((AE_INFO, status,
-				"While evaluating SleepState [%s], bad Sleep object %p type %s",
-				info->pathname, info->return_object,
-				acpi_ut_get_object_type_name(info->
-							     return_object)));
-	}
-
-	acpi_ut_remove_reference(info->return_object);
-
-      cleanup:
-	ACPI_FREE(info);
-	return_ACPI_STATUS(status);
-}
-
-ACPI_EXPORT_SYMBOL(acpi_get_sleep_type_data)
-
-/*******************************************************************************
- *
  * FUNCTION:    acpi_hw_get_register_bit_mask
  *
  * PARAMETERS:  register_id         - Index of ACPI Register to access
@@ -230,6 +111,7 @@ ACPI_EXPORT_SYMBOL(acpi_get_sleep_type_data)
  * DESCRIPTION: Map register_id into a register bitmask.
  *
  ******************************************************************************/
+
 struct acpi_bit_register_info *acpi_hw_get_bit_register_info(u32 register_id)
 {
 	ACPI_FUNCTION_ENTRY();
@@ -243,223 +125,6 @@ struct acpi_bit_register_info *acpi_hw_get_bit_register_info(u32 register_id)
 	return (&acpi_gbl_bit_register_info[register_id]);
 }
 
-ACPI_EXPORT_SYMBOL(acpi_get_register_unlocked)
-
-/*******************************************************************************
- *
- * FUNCTION:    acpi_get_register
- *
- * PARAMETERS:  register_id     - ID of ACPI bit_register to access
- *              return_value    - Value that was read from the register
- *
- * RETURN:      Status and the value read from specified Register. Value
- *              returned is normalized to bit0 (is shifted all the way right)
- *
- * DESCRIPTION: ACPI bit_register read function.
- *
- ******************************************************************************/
-
-acpi_status acpi_get_register_unlocked(u32 register_id, u32 * return_value)
-{
-	u32 register_value = 0;
-	struct acpi_bit_register_info *bit_reg_info;
-	acpi_status status;
-
-	ACPI_FUNCTION_TRACE(acpi_get_register);
-
-	/* Get the info structure corresponding to the requested ACPI Register */
-
-	bit_reg_info = acpi_hw_get_bit_register_info(register_id);
-	if (!bit_reg_info) {
-		return_ACPI_STATUS(AE_BAD_PARAMETER);
-	}
-
-	/* Read from the register */
-
-	status = acpi_hw_register_read(bit_reg_info->parent_register,
-				       &register_value);
-
-	if (ACPI_SUCCESS(status)) {
-
-		/* Normalize the value that was read */
-
-		register_value =
-		    ((register_value & bit_reg_info->access_bit_mask)
-		     >> bit_reg_info->bit_position);
-
-		*return_value = register_value;
-
-		ACPI_DEBUG_PRINT((ACPI_DB_IO, "Read value %8.8X register %X\n",
-				  register_value,
-				  bit_reg_info->parent_register));
-	}
-
-	return_ACPI_STATUS(status);
-}
-
-acpi_status acpi_get_register(u32 register_id, u32 * return_value)
-{
-	acpi_status status;
-	acpi_cpu_flags flags;
-	flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
-	status = acpi_get_register_unlocked(register_id, return_value);
-	acpi_os_release_lock(acpi_gbl_hardware_lock, flags);
-	return status;
-}
-
-ACPI_EXPORT_SYMBOL(acpi_get_register)
-
-/*******************************************************************************
- *
- * FUNCTION:    acpi_set_register
- *
- * PARAMETERS:  register_id     - ID of ACPI bit_register to access
- *              Value           - (only used on write) value to write to the
- *                                Register, NOT pre-normalized to the bit pos
- *
- * RETURN:      Status
- *
- * DESCRIPTION: ACPI Bit Register write function.
- *
- ******************************************************************************/
-acpi_status acpi_set_register(u32 register_id, u32 value)
-{
-	u32 register_value = 0;
-	struct acpi_bit_register_info *bit_reg_info;
-	acpi_status status;
-	acpi_cpu_flags lock_flags;
-
-	ACPI_FUNCTION_TRACE_U32(acpi_set_register, register_id);
-
-	/* Get the info structure corresponding to the requested ACPI Register */
-
-	bit_reg_info = acpi_hw_get_bit_register_info(register_id);
-	if (!bit_reg_info) {
-		ACPI_ERROR((AE_INFO, "Bad ACPI HW RegisterId: %X",
-			    register_id));
-		return_ACPI_STATUS(AE_BAD_PARAMETER);
-	}
-
-	lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
-
-	/* Always do a register read first so we can insert the new bits  */
-
-	status = acpi_hw_register_read(bit_reg_info->parent_register,
-				       &register_value);
-	if (ACPI_FAILURE(status)) {
-		goto unlock_and_exit;
-	}
-
-	/*
-	 * Decode the Register ID
-	 * Register ID = [Register block ID] | [bit ID]
-	 *
-	 * Check bit ID to fine locate Register offset.
-	 * Check Mask to determine Register offset, and then read-write.
-	 */
-	switch (bit_reg_info->parent_register) {
-	case ACPI_REGISTER_PM1_STATUS:
-
-		/*
-		 * Status Registers are different from the rest. Clear by
-		 * writing 1, and writing 0 has no effect. So, the only relevant
-		 * information is the single bit we're interested in, all others should
-		 * be written as 0 so they will be left unchanged.
-		 */
-		value = ACPI_REGISTER_PREPARE_BITS(value,
-						   bit_reg_info->bit_position,
-						   bit_reg_info->
-						   access_bit_mask);
-		if (value) {
-			status = acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS,
-							(u16) value);
-			register_value = 0;
-		}
-		break;
-
-	case ACPI_REGISTER_PM1_ENABLE:
-
-		ACPI_REGISTER_INSERT_VALUE(register_value,
-					   bit_reg_info->bit_position,
-					   bit_reg_info->access_bit_mask,
-					   value);
-
-		status = acpi_hw_register_write(ACPI_REGISTER_PM1_ENABLE,
-						(u16) register_value);
-		break;
-
-	case ACPI_REGISTER_PM1_CONTROL:
-
-		/*
-		 * Write the PM1 Control register.
-		 * Note that at this level, the fact that there are actually TWO
-		 * registers (A and B - and B may not exist) is abstracted.
-		 */
-		ACPI_DEBUG_PRINT((ACPI_DB_IO, "PM1 control: Read %X\n",
-				  register_value));
-
-		ACPI_REGISTER_INSERT_VALUE(register_value,
-					   bit_reg_info->bit_position,
-					   bit_reg_info->access_bit_mask,
-					   value);
-
-		status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL,
-						(u16) register_value);
-		break;
-
-	case ACPI_REGISTER_PM2_CONTROL:
-
-		status = acpi_hw_register_read(ACPI_REGISTER_PM2_CONTROL,
-					       &register_value);
-		if (ACPI_FAILURE(status)) {
-			goto unlock_and_exit;
-		}
-
-		ACPI_DEBUG_PRINT((ACPI_DB_IO,
-				  "PM2 control: Read %X from %8.8X%8.8X\n",
-				  register_value,
-				  ACPI_FORMAT_UINT64(acpi_gbl_FADT.
-						     xpm2_control_block.
-						     address)));
-
-		ACPI_REGISTER_INSERT_VALUE(register_value,
-					   bit_reg_info->bit_position,
-					   bit_reg_info->access_bit_mask,
-					   value);
-
-		ACPI_DEBUG_PRINT((ACPI_DB_IO,
-				  "About to write %4.4X to %8.8X%8.8X\n",
-				  register_value,
-				  ACPI_FORMAT_UINT64(acpi_gbl_FADT.
-						     xpm2_control_block.
-						     address)));
-
-		status = acpi_hw_register_write(ACPI_REGISTER_PM2_CONTROL,
-						(u8) (register_value));
-		break;
-
-	default:
-		break;
-	}
-
-      unlock_and_exit:
-
-	acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
-
-	/* Normalize the value that was read */
-
-	ACPI_DEBUG_EXEC(register_value =
-			((register_value & bit_reg_info->access_bit_mask) >>
-			 bit_reg_info->bit_position));
-
-	ACPI_DEBUG_PRINT((ACPI_DB_IO,
-			  "Set bits: %8.8X actual %8.8X register %X\n", value,
-			  register_value, bit_reg_info->parent_register));
-	return_ACPI_STATUS(status);
-}
-
-ACPI_EXPORT_SYMBOL(acpi_set_register)
-
 /******************************************************************************
  *
  * FUNCTION:    acpi_hw_register_read
@@ -685,162 +350,3 @@ acpi_status acpi_hw_register_write(u32 register_id, u32 value)
       exit:
 	return_ACPI_STATUS(status);
 }
-
-/******************************************************************************
- *
- * FUNCTION:    acpi_read
- *
- * PARAMETERS:  Value               - Where the value is returned
- *              Reg                 - GAS register structure
- *
- * RETURN:      Status
- *
- * DESCRIPTION: Read from either memory or IO space.
- *
- ******************************************************************************/
-
-acpi_status acpi_read(u32 *value, struct acpi_generic_address *reg)
-{
-	u32 width;
-	u64 address;
-	acpi_status status;
-
-	ACPI_FUNCTION_NAME(acpi_read);
-
-	/*
-	 * Must have a valid pointer to a GAS structure, and
-	 * a non-zero address within. However, don't return an error
-	 * because the PM1A/B code must not fail if B isn't present.
-	 */
-	if (!reg) {
-		return (AE_OK);
-	}
-
-	/* Get a local copy of the address. Handles possible alignment issues */
-
-	ACPI_MOVE_64_TO_64(&address, &reg->address);
-	if (!address) {
-		return (AE_OK);
-	}
-
-	/* Supported widths are 8/16/32 */
-
-	width = reg->bit_width;
-	if ((width != 8) && (width != 16) && (width != 32)) {
-		return (AE_SUPPORT);
-	}
-
-	/* Initialize entire 32-bit return value to zero */
-
-	*value = 0;
-
-	/*
-	 * Two address spaces supported: Memory or IO.
-	 * PCI_Config is not supported here because the GAS struct is insufficient
-	 */
-	switch (reg->space_id) {
-	case ACPI_ADR_SPACE_SYSTEM_MEMORY:
-
-		status = acpi_os_read_memory((acpi_physical_address) address,
-					     value, width);
-		break;
-
-	case ACPI_ADR_SPACE_SYSTEM_IO:
-
-		status =
-		    acpi_os_read_port((acpi_io_address) address, value, width);
-		break;
-
-	default:
-		ACPI_ERROR((AE_INFO,
-			    "Unsupported address space: %X", reg->space_id));
-		return (AE_BAD_PARAMETER);
-	}
-
-	ACPI_DEBUG_PRINT((ACPI_DB_IO,
-			  "Read:  %8.8X width %2d from %8.8X%8.8X (%s)\n",
-			  *value, width, ACPI_FORMAT_UINT64(address),
-			  acpi_ut_get_region_name(reg->space_id)));
-
-	return (status);
-}
-
-ACPI_EXPORT_SYMBOL(acpi_read)
-
-/******************************************************************************
- *
- * FUNCTION:    acpi_write
- *
- * PARAMETERS:  Value               - To be written
- *              Reg                 - GAS register structure
- *
- * RETURN:      Status
- *
- * DESCRIPTION: Write to either memory or IO space.
- *
- ******************************************************************************/
-
-acpi_status
-acpi_write(u32 value, struct acpi_generic_address *reg)
-{
-	u32 width;
-	u64 address;
-	acpi_status status;
-
-	ACPI_FUNCTION_NAME(acpi_write);
-
-	/*
-	 * Must have a valid pointer to a GAS structure, and
-	 * a non-zero address within. However, don't return an error
-	 * because the PM1A/B code must not fail if B isn't present.
-	 */
-	if (!reg) {
-		return (AE_OK);
-	}
-
-	/* Get a local copy of the address. Handles possible alignment issues */
-
-	ACPI_MOVE_64_TO_64(&address, &reg->address);
-	if (!address) {
-		return (AE_OK);
-	}
-
-	/* Supported widths are 8/16/32 */
-
-	width = reg->bit_width;
-	if ((width != 8) && (width != 16) && (width != 32)) {
-		return (AE_SUPPORT);
-	}
-
-	/*
-	 * Two address spaces supported: Memory or IO.
-	 * PCI_Config is not supported here because the GAS struct is insufficient
-	 */
-	switch (reg->space_id) {
-	case ACPI_ADR_SPACE_SYSTEM_MEMORY:
-
-		status = acpi_os_write_memory((acpi_physical_address) address,
-					      value, width);
-		break;
-
-	case ACPI_ADR_SPACE_SYSTEM_IO:
-
-		status = acpi_os_write_port((acpi_io_address) address, value,
-					    width);
-		break;
-
-	default:
-		ACPI_ERROR((AE_INFO,
-			    "Unsupported address space: %X", reg->space_id));
-		return (AE_BAD_PARAMETER);
-	}
-
-	ACPI_DEBUG_PRINT((ACPI_DB_IO,
-			  "Wrote: %8.8X width %2d   to %8.8X%8.8X (%s)\n",
-			  value, width, ACPI_FORMAT_UINT64(address),
-			  acpi_ut_get_region_name(reg->space_id)));
-
-	return (status);
-}
-
-ACPI_EXPORT_SYMBOL(acpi_write)
diff --git a/drivers/acpi/hardware/hwxface.c b/drivers/acpi/hardware/hwxface.c
new file mode 100644
index 00000000000..b6244a0fcf4
--- /dev/null
+++ b/drivers/acpi/hardware/hwxface.c
@@ -0,0 +1,555 @@
+
+/******************************************************************************
+ *
+ * Module Name: hwxface - Public ACPICA hardware interfaces
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2008, Intel Corp.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ *    substantially similar to the "NO WARRANTY" disclaimer below
+ *    ("Disclaimer") and any redistribution must be conditioned upon
+ *    including a substantially similar Disclaimer requirement for further
+ *    binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ *    of any contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ */
+
+#include <acpi/acpi.h>
+#include <acpi/acnamesp.h>
+
+#define _COMPONENT          ACPI_HARDWARE
+ACPI_MODULE_NAME("hwxface")
+
+/******************************************************************************
+ *
+ * FUNCTION:    acpi_read
+ *
+ * PARAMETERS:  Value               - Where the value is returned
+ *              Reg                 - GAS register structure
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Read from either memory or IO space.
+ *
+ ******************************************************************************/
+acpi_status acpi_read(u32 *value, struct acpi_generic_address *reg)
+{
+	u32 width;
+	u64 address;
+	acpi_status status;
+
+	ACPI_FUNCTION_NAME(acpi_read);
+
+	/*
+	 * Must have a valid pointer to a GAS structure, and
+	 * a non-zero address within. However, don't return an error
+	 * because the PM1A/B code must not fail if B isn't present.
+	 */
+	if (!reg) {
+		return (AE_OK);
+	}
+
+	/* Get a local copy of the address. Handles possible alignment issues */
+
+	ACPI_MOVE_64_TO_64(&address, &reg->address);
+	if (!address) {
+		return (AE_OK);
+	}
+
+	/* Supported widths are 8/16/32 */
+
+	width = reg->bit_width;
+	if ((width != 8) && (width != 16) && (width != 32)) {
+		return (AE_SUPPORT);
+	}
+
+	/* Initialize entire 32-bit return value to zero */
+
+	*value = 0;
+
+	/*
+	 * Two address spaces supported: Memory or IO.
+	 * PCI_Config is not supported here because the GAS struct is insufficient
+	 */
+	switch (reg->space_id) {
+	case ACPI_ADR_SPACE_SYSTEM_MEMORY:
+
+		status = acpi_os_read_memory((acpi_physical_address) address,
+					     value, width);
+		break;
+
+	case ACPI_ADR_SPACE_SYSTEM_IO:
+
+		status =
+		    acpi_os_read_port((acpi_io_address) address, value, width);
+		break;
+
+	default:
+		ACPI_ERROR((AE_INFO,
+			    "Unsupported address space: %X", reg->space_id));
+		return (AE_BAD_PARAMETER);
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_IO,
+			  "Read:  %8.8X width %2d from %8.8X%8.8X (%s)\n",
+			  *value, width, ACPI_FORMAT_UINT64(address),
+			  acpi_ut_get_region_name(reg->space_id)));
+
+	return (status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_read)
+
+/******************************************************************************
+ *
+ * FUNCTION:    acpi_write
+ *
+ * PARAMETERS:  Value               - To be written
+ *              Reg                 - GAS register structure
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Write to either memory or IO space.
+ *
+ ******************************************************************************/
+acpi_status acpi_write(u32 value, struct acpi_generic_address *reg)
+{
+	u32 width;
+	u64 address;
+	acpi_status status;
+
+	ACPI_FUNCTION_NAME(acpi_write);
+
+	/*
+	 * Must have a valid pointer to a GAS structure, and
+	 * a non-zero address within. However, don't return an error
+	 * because the PM1A/B code must not fail if B isn't present.
+	 */
+	if (!reg) {
+		return (AE_OK);
+	}
+
+	/* Get a local copy of the address. Handles possible alignment issues */
+
+	ACPI_MOVE_64_TO_64(&address, &reg->address);
+	if (!address) {
+		return (AE_OK);
+	}
+
+	/* Supported widths are 8/16/32 */
+
+	width = reg->bit_width;
+	if ((width != 8) && (width != 16) && (width != 32)) {
+		return (AE_SUPPORT);
+	}
+
+	/*
+	 * Two address spaces supported: Memory or IO.
+	 * PCI_Config is not supported here because the GAS struct is insufficient
+	 */
+	switch (reg->space_id) {
+	case ACPI_ADR_SPACE_SYSTEM_MEMORY:
+
+		status = acpi_os_write_memory((acpi_physical_address) address,
+					      value, width);
+		break;
+
+	case ACPI_ADR_SPACE_SYSTEM_IO:
+
+		status = acpi_os_write_port((acpi_io_address) address, value,
+					    width);
+		break;
+
+	default:
+		ACPI_ERROR((AE_INFO,
+			    "Unsupported address space: %X", reg->space_id));
+		return (AE_BAD_PARAMETER);
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_IO,
+			  "Wrote: %8.8X width %2d   to %8.8X%8.8X (%s)\n",
+			  value, width, ACPI_FORMAT_UINT64(address),
+			  acpi_ut_get_region_name(reg->space_id)));
+
+	return (status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_write)
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_get_register_unlocked
+ *
+ * PARAMETERS:  register_id     - ID of ACPI bit_register to access
+ *              return_value    - Value that was read from the register
+ *
+ * RETURN:      Status and the value read from specified Register. Value
+ *              returned is normalized to bit0 (is shifted all the way right)
+ *
+ * DESCRIPTION: ACPI bit_register read function. Does not acquire the HW lock.
+ *
+ ******************************************************************************/
+acpi_status acpi_get_register_unlocked(u32 register_id, u32 *return_value)
+{
+	u32 register_value = 0;
+	struct acpi_bit_register_info *bit_reg_info;
+	acpi_status status;
+
+	ACPI_FUNCTION_TRACE(acpi_get_register_unlocked);
+
+	/* Get the info structure corresponding to the requested ACPI Register */
+
+	bit_reg_info = acpi_hw_get_bit_register_info(register_id);
+	if (!bit_reg_info) {
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	/* Read from the register */
+
+	status = acpi_hw_register_read(bit_reg_info->parent_register,
+				       &register_value);
+
+	if (ACPI_SUCCESS(status)) {
+
+		/* Normalize the value that was read */
+
+		register_value =
+		    ((register_value & bit_reg_info->access_bit_mask)
+		     >> bit_reg_info->bit_position);
+
+		*return_value = register_value;
+
+		ACPI_DEBUG_PRINT((ACPI_DB_IO, "Read value %8.8X register %X\n",
+				  register_value,
+				  bit_reg_info->parent_register));
+	}
+
+	return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_get_register_unlocked)
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_get_register
+ *
+ * PARAMETERS:  register_id     - ID of ACPI bit_register to access
+ *              return_value    - Value that was read from the register
+ *
+ * RETURN:      Status and the value read from specified Register. Value
+ *              returned is normalized to bit0 (is shifted all the way right)
+ *
+ * DESCRIPTION: ACPI bit_register read function.
+ *
+ ******************************************************************************/
+acpi_status acpi_get_register(u32 register_id, u32 *return_value)
+{
+	acpi_status status;
+	acpi_cpu_flags flags;
+
+	flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
+	status = acpi_get_register_unlocked(register_id, return_value);
+	acpi_os_release_lock(acpi_gbl_hardware_lock, flags);
+
+	return (status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_get_register)
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_set_register
+ *
+ * PARAMETERS:  register_id     - ID of ACPI bit_register to access
+ *              Value           - (only used on write) value to write to the
+ *                                Register, NOT pre-normalized to the bit pos
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: ACPI Bit Register write function.
+ *
+ ******************************************************************************/
+acpi_status acpi_set_register(u32 register_id, u32 value)
+{
+	u32 register_value = 0;
+	struct acpi_bit_register_info *bit_reg_info;
+	acpi_status status;
+	acpi_cpu_flags lock_flags;
+
+	ACPI_FUNCTION_TRACE_U32(acpi_set_register, register_id);
+
+	/* Get the info structure corresponding to the requested ACPI Register */
+
+	bit_reg_info = acpi_hw_get_bit_register_info(register_id);
+	if (!bit_reg_info) {
+		ACPI_ERROR((AE_INFO, "Bad ACPI HW RegisterId: %X",
+			    register_id));
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
+
+	/* Always do a register read first so we can insert the new bits  */
+
+	status = acpi_hw_register_read(bit_reg_info->parent_register,
+				       &register_value);
+	if (ACPI_FAILURE(status)) {
+		goto unlock_and_exit;
+	}
+
+	/*
+	 * Decode the Register ID
+	 * Register ID = [Register block ID] | [bit ID]
+	 *
+	 * Check bit ID to fine locate Register offset.
+	 * Check Mask to determine Register offset, and then read-write.
+	 */
+	switch (bit_reg_info->parent_register) {
+	case ACPI_REGISTER_PM1_STATUS:
+
+		/*
+		 * Status Registers are different from the rest. Clear by
+		 * writing 1, and writing 0 has no effect. So, the only relevant
+		 * information is the single bit we're interested in, all others should
+		 * be written as 0 so they will be left unchanged.
+		 */
+		value = ACPI_REGISTER_PREPARE_BITS(value,
+						   bit_reg_info->bit_position,
+						   bit_reg_info->
+						   access_bit_mask);
+		if (value) {
+			status =
+			    acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS,
+						   (u16) value);
+			register_value = 0;
+		}
+		break;
+
+	case ACPI_REGISTER_PM1_ENABLE:
+
+		ACPI_REGISTER_INSERT_VALUE(register_value,
+					   bit_reg_info->bit_position,
+					   bit_reg_info->access_bit_mask,
+					   value);
+
+		status = acpi_hw_register_write(ACPI_REGISTER_PM1_ENABLE,
+						(u16) register_value);
+		break;
+
+	case ACPI_REGISTER_PM1_CONTROL:
+
+		/*
+		 * Write the PM1 Control register.
+		 * Note that at this level, the fact that there are actually TWO
+		 * registers (A and B - and B may not exist) is abstracted.
+		 */
+		ACPI_DEBUG_PRINT((ACPI_DB_IO, "PM1 control: Read %X\n",
+				  register_value));
+
+		ACPI_REGISTER_INSERT_VALUE(register_value,
+					   bit_reg_info->bit_position,
+					   bit_reg_info->access_bit_mask,
+					   value);
+
+		status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL,
+						(u16) register_value);
+		break;
+
+	case ACPI_REGISTER_PM2_CONTROL:
+
+		status = acpi_hw_register_read(ACPI_REGISTER_PM2_CONTROL,
+					       &register_value);
+		if (ACPI_FAILURE(status)) {
+			goto unlock_and_exit;
+		}
+
+		ACPI_DEBUG_PRINT((ACPI_DB_IO,
+				  "PM2 control: Read %X from %8.8X%8.8X\n",
+				  register_value,
+				  ACPI_FORMAT_UINT64(acpi_gbl_FADT.
+						     xpm2_control_block.
+						     address)));
+
+		ACPI_REGISTER_INSERT_VALUE(register_value,
+					   bit_reg_info->bit_position,
+					   bit_reg_info->access_bit_mask,
+					   value);
+
+		ACPI_DEBUG_PRINT((ACPI_DB_IO,
+				  "About to write %4.4X to %8.8X%8.8X\n",
+				  register_value,
+				  ACPI_FORMAT_UINT64(acpi_gbl_FADT.
+						     xpm2_control_block.
+						     address)));
+
+		status = acpi_hw_register_write(ACPI_REGISTER_PM2_CONTROL,
+						(u8) (register_value));
+		break;
+
+	default:
+		break;
+	}
+
+      unlock_and_exit:
+
+	acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
+
+	/* Normalize the value that was read */
+
+	ACPI_DEBUG_EXEC(register_value =
+			((register_value & bit_reg_info->access_bit_mask) >>
+			 bit_reg_info->bit_position));
+
+	ACPI_DEBUG_PRINT((ACPI_DB_IO,
+			  "Set bits: %8.8X actual %8.8X register %X\n", value,
+			  register_value, bit_reg_info->parent_register));
+	return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_set_register)
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_get_sleep_type_data
+ *
+ * PARAMETERS:  sleep_state         - Numeric sleep state
+ *              *sleep_type_a        - Where SLP_TYPa is returned
+ *              *sleep_type_b        - Where SLP_TYPb is returned
+ *
+ * RETURN:      Status - ACPI status
+ *
+ * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested sleep
+ *              state.
+ *
+ ******************************************************************************/
+acpi_status
+acpi_get_sleep_type_data(u8 sleep_state, u8 *sleep_type_a, u8 *sleep_type_b)
+{
+	acpi_status status = AE_OK;
+	struct acpi_evaluate_info *info;
+
+	ACPI_FUNCTION_TRACE(acpi_get_sleep_type_data);
+
+	/* Validate parameters */
+
+	if ((sleep_state > ACPI_S_STATES_MAX) || !sleep_type_a || !sleep_type_b) {
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	/* Allocate the evaluation information block */
+
+	info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
+	if (!info) {
+		return_ACPI_STATUS(AE_NO_MEMORY);
+	}
+
+	info->pathname =
+	    ACPI_CAST_PTR(char, acpi_gbl_sleep_state_names[sleep_state]);
+
+	/* Evaluate the namespace object containing the values for this state */
+
+	status = acpi_ns_evaluate(info);
+	if (ACPI_FAILURE(status)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+				  "%s while evaluating SleepState [%s]\n",
+				  acpi_format_exception(status),
+				  info->pathname));
+
+		goto cleanup;
+	}
+
+	/* Must have a return object */
+
+	if (!info->return_object) {
+		ACPI_ERROR((AE_INFO, "No Sleep State object returned from [%s]",
+			    info->pathname));
+		status = AE_NOT_EXIST;
+	}
+
+	/* It must be of type Package */
+
+	else if (ACPI_GET_OBJECT_TYPE(info->return_object) != ACPI_TYPE_PACKAGE) {
+		ACPI_ERROR((AE_INFO,
+			    "Sleep State return object is not a Package"));
+		status = AE_AML_OPERAND_TYPE;
+	}
+
+	/*
+	 * The package must have at least two elements. NOTE (March 2005): This
+	 * goes against the current ACPI spec which defines this object as a
+	 * package with one encoded DWORD element. However, existing practice
+	 * by BIOS vendors seems to be to have 2 or more elements, at least
+	 * one per sleep type (A/B).
+	 */
+	else if (info->return_object->package.count < 2) {
+		ACPI_ERROR((AE_INFO,
+			    "Sleep State return package does not have at least two elements"));
+		status = AE_AML_NO_OPERAND;
+	}
+
+	/* The first two elements must both be of type Integer */
+
+	else if ((ACPI_GET_OBJECT_TYPE(info->return_object->package.elements[0])
+		  != ACPI_TYPE_INTEGER) ||
+		 (ACPI_GET_OBJECT_TYPE(info->return_object->package.elements[1])
+		  != ACPI_TYPE_INTEGER)) {
+		ACPI_ERROR((AE_INFO,
+			    "Sleep State return package elements are not both Integers (%s, %s)",
+			    acpi_ut_get_object_type_name(info->return_object->
+							 package.elements[0]),
+			    acpi_ut_get_object_type_name(info->return_object->
+							 package.elements[1])));
+		status = AE_AML_OPERAND_TYPE;
+	} else {
+		/* Valid _Sx_ package size, type, and value */
+
+		*sleep_type_a = (u8)
+		    (info->return_object->package.elements[0])->integer.value;
+		*sleep_type_b = (u8)
+		    (info->return_object->package.elements[1])->integer.value;
+	}
+
+	if (ACPI_FAILURE(status)) {
+		ACPI_EXCEPTION((AE_INFO, status,
+				"While evaluating SleepState [%s], bad Sleep object %p type %s",
+				info->pathname, info->return_object,
+				acpi_ut_get_object_type_name(info->
+							     return_object)));
+	}
+
+	acpi_ut_remove_reference(info->return_object);
+
+      cleanup:
+	ACPI_FREE(info);
+	return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_get_sleep_type_data)