summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/acpica/hwxface.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/acpi/acpica/hwxface.c')
-rw-r--r--drivers/acpi/acpica/hwxface.c137
1 files changed, 80 insertions, 57 deletions
diff --git a/drivers/acpi/acpica/hwxface.c b/drivers/acpi/acpica/hwxface.c
index 05a154c3c9a..04c2e16f2c0 100644
--- a/drivers/acpi/acpica/hwxface.c
+++ b/drivers/acpi/acpica/hwxface.c
@@ -5,7 +5,7 @@
*****************************************************************************/
/*
- * Copyright (C) 2000 - 2012, Intel Corp.
+ * Copyright (C) 2000 - 2013, Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -80,10 +80,10 @@ acpi_status acpi_reset(void)
if (reset_reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
/*
- * For I/O space, write directly to the OSL. This
- * bypasses the port validation mechanism, which may
- * block a valid write to the reset register. Spec
- * section 4.7.3.6 requires register width to be 8.
+ * For I/O space, write directly to the OSL. This bypasses the port
+ * validation mechanism, which may block a valid write to the reset
+ * register.
+ * Spec section 4.7.3.6 requires register width to be 8.
*/
status =
acpi_os_write_port((acpi_io_address) reset_reg->address,
@@ -333,7 +333,7 @@ ACPI_EXPORT_SYMBOL(acpi_read_bit_register)
* FUNCTION: acpi_write_bit_register
*
* PARAMETERS: register_id - ID of ACPI Bit Register to access
- * Value - Value to write to the register, in bit
+ * value - Value to write to the register, in bit
* position zero. The bit is automatically
* shifted to the correct position.
*
@@ -440,17 +440,41 @@ ACPI_EXPORT_SYMBOL(acpi_write_bit_register)
* *sleep_type_a - Where SLP_TYPa is returned
* *sleep_type_b - Where SLP_TYPb is returned
*
- * RETURN: status - ACPI status
+ * RETURN: Status
+ *
+ * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested
+ * sleep state via the appropriate \_Sx object.
+ *
+ * The sleep state package returned from the corresponding \_Sx_ object
+ * must contain at least one integer.
+ *
+ * March 2005:
+ * Added support for a package that contains two integers. This
+ * goes against the ACPI specification which defines this object as a
+ * package with one encoded DWORD integer. However, existing practice
+ * by many BIOS vendors is to return a package with 2 or more integer
+ * elements, at least one per sleep type (A/B).
*
- * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested sleep
- * state.
+ * January 2013:
+ * Therefore, we must be prepared to accept a package with either a
+ * single integer or multiple integers.
+ *
+ * The single integer DWORD format is as follows:
+ * BYTE 0 - Value for the PM1A SLP_TYP register
+ * BYTE 1 - Value for the PM1B SLP_TYP register
+ * BYTE 2-3 - Reserved
+ *
+ * The dual integer format is as follows:
+ * Integer 0 - Value for the PM1A SLP_TYP register
+ * Integer 1 - Value for the PM1A SLP_TYP register
*
******************************************************************************/
acpi_status
acpi_get_sleep_type_data(u8 sleep_state, u8 *sleep_type_a, u8 *sleep_type_b)
{
- acpi_status status = AE_OK;
+ acpi_status status;
struct acpi_evaluate_info *info;
+ union acpi_operand_object **elements;
ACPI_FUNCTION_TRACE(acpi_get_sleep_type_data);
@@ -467,18 +491,14 @@ acpi_get_sleep_type_data(u8 sleep_state, u8 *sleep_type_a, u8 *sleep_type_b)
return_ACPI_STATUS(AE_NO_MEMORY);
}
+ /*
+ * Evaluate the \_Sx namespace object containing the register values
+ * for this state
+ */
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;
}
@@ -487,64 +507,67 @@ acpi_get_sleep_type_data(u8 sleep_state, u8 *sleep_type_a, u8 *sleep_type_b)
if (!info->return_object) {
ACPI_ERROR((AE_INFO, "No Sleep State object returned from [%s]",
info->pathname));
- status = AE_NOT_EXIST;
+ status = AE_AML_NO_RETURN_VALUE;
+ goto cleanup;
}
- /* It must be of type Package */
+ /* Return object must be of type Package */
- else if (info->return_object->common.type != ACPI_TYPE_PACKAGE) {
+ if (info->return_object->common.type != ACPI_TYPE_PACKAGE) {
ACPI_ERROR((AE_INFO,
"Sleep State return object is not a Package"));
status = AE_AML_OPERAND_TYPE;
+ goto cleanup1;
}
/*
- * 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).
+ * Any warnings about the package length or the object types have
+ * already been issued by the predefined name module -- there is no
+ * need to repeat them here.
*/
- 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;
- }
+ elements = info->return_object->package.elements;
+ switch (info->return_object->package.count) {
+ case 0:
+ status = AE_AML_PACKAGE_LIMIT;
+ break;
+
+ case 1:
+ if (elements[0]->common.type != ACPI_TYPE_INTEGER) {
+ status = AE_AML_OPERAND_TYPE;
+ break;
+ }
- /* The first two elements must both be of type Integer */
+ /* A valid _Sx_ package with one integer */
- else if (((info->return_object->package.elements[0])->common.type
- != ACPI_TYPE_INTEGER) ||
- ((info->return_object->package.elements[1])->common.type
- != 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)elements[0]->integer.value;
+ *sleep_type_b = (u8)(elements[0]->integer.value >> 8);
+ break;
- *sleep_type_a = (u8)
- (info->return_object->package.elements[0])->integer.value;
- *sleep_type_b = (u8)
- (info->return_object->package.elements[1])->integer.value;
- }
+ case 2:
+ default:
+ if ((elements[0]->common.type != ACPI_TYPE_INTEGER) ||
+ (elements[1]->common.type != ACPI_TYPE_INTEGER)) {
+ status = AE_AML_OPERAND_TYPE;
+ break;
+ }
- 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)));
+ /* A valid _Sx_ package with two integers */
+
+ *sleep_type_a = (u8)elements[0]->integer.value;
+ *sleep_type_b = (u8)elements[1]->integer.value;
+ break;
}
+ cleanup1:
acpi_ut_remove_reference(info->return_object);
cleanup:
+ if (ACPI_FAILURE(status)) {
+ ACPI_EXCEPTION((AE_INFO, status,
+ "While evaluating Sleep State [%s]",
+ info->pathname));
+ }
+
ACPI_FREE(info);
return_ACPI_STATUS(status);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-23 07:47:41 +0000