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50eca3eb89
linux/drivers/acpi/events/evgpe.c
Bob Moore 50eca3eb89 [ACPI] ACPICA 20050930 
Completed a major overhaul of the Resource Manager code -
specifically, optimizations in the area of the AML/internal
resource conversion code. The code has been optimized to
simplify and eliminate duplicated code, CPU stack use has
been decreased by optimizing function parameters and local
variables, and naming conventions across the manager have
been standardized for clarity and ease of maintenance (this
includes function, parameter, variable, and struct/typedef
names.)

All Resource Manager dispatch and information tables have
been moved to a single location for clarity and ease of
maintenance. One new file was created, named "rsinfo.c".

The ACPI return macros (return_ACPI_STATUS, etc.) have
been modified to guarantee that the argument is
not evaluated twice, making them less prone to macro
side-effects. However, since there exists the possibility
of additional stack use if a particular compiler cannot
optimize them (such as in the debug generation case),
the original macros are optionally available.  Note that
some invocations of the return_VALUE macro may now cause
size mismatch warnings; the return_UINT8 and return_UINT32
macros are provided to eliminate these. (From Randy Dunlap)

Implemented a new mechanism to enable debug tracing for
individual control methods. A new external interface,
acpi_debug_trace(), is provided to enable this mechanism. The
intent is to allow the host OS to easily enable and disable
tracing for problematic control methods. This interface
can be easily exposed to a user or debugger interface if
desired. See the file psxface.c for details.

acpi_ut_callocate() will now return a valid pointer if a
length of zero is specified - a length of one is used
and a warning is issued. This matches the behavior of
acpi_ut_allocate().

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2005-12-10 00:20:25 -05:00

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/******************************************************************************
*
* Module Name: evgpe - General Purpose Event handling and dispatch
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2005, R. Byron Moore
* 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/acevents.h>
#include <acpi/acnamesp.h>
#define _COMPONENT ACPI_EVENTS
ACPI_MODULE_NAME("evgpe")
/* Local prototypes */
static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context);
/*******************************************************************************
*
* FUNCTION: acpi_ev_set_gpe_type
*
* PARAMETERS: gpe_event_info - GPE to set
* Type - New type
*
* RETURN: Status
*
* DESCRIPTION: Sets the new type for the GPE (wake, run, or wake/run)
*
******************************************************************************/
acpi_status
acpi_ev_set_gpe_type(struct acpi_gpe_event_info *gpe_event_info, u8 type)
{
acpi_status status;
ACPI_FUNCTION_TRACE("ev_set_gpe_type");
/* Validate type and update register enable masks */
switch (type) {
case ACPI_GPE_TYPE_WAKE:
case ACPI_GPE_TYPE_RUNTIME:
case ACPI_GPE_TYPE_WAKE_RUN:
break;
default:
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Disable the GPE if currently enabled */
status = acpi_ev_disable_gpe(gpe_event_info);
/* Type was validated above */
gpe_event_info->flags &= ~ACPI_GPE_TYPE_MASK; /* Clear type bits */
gpe_event_info->flags |= type; /* Insert type */
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_update_gpe_enable_masks
*
* PARAMETERS: gpe_event_info - GPE to update
* Type - What to do: ACPI_GPE_DISABLE or
* ACPI_GPE_ENABLE
*
* RETURN: Status
*
* DESCRIPTION: Updates GPE register enable masks based on the GPE type
*
******************************************************************************/
acpi_status
acpi_ev_update_gpe_enable_masks(struct acpi_gpe_event_info *gpe_event_info,
u8 type)
{
struct acpi_gpe_register_info *gpe_register_info;
u8 register_bit;
ACPI_FUNCTION_TRACE("ev_update_gpe_enable_masks");
gpe_register_info = gpe_event_info->register_info;
if (!gpe_register_info) {
return_ACPI_STATUS(AE_NOT_EXIST);
}
register_bit = gpe_event_info->register_bit;
/* 1) Disable case. Simply clear all enable bits */
if (type == ACPI_GPE_DISABLE) {
ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
register_bit);
ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
return_ACPI_STATUS(AE_OK);
}
/* 2) Enable case. Set/Clear the appropriate enable bits */
switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
case ACPI_GPE_TYPE_WAKE:
ACPI_SET_BIT(gpe_register_info->enable_for_wake, register_bit);
ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
break;
case ACPI_GPE_TYPE_RUNTIME:
ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
register_bit);
ACPI_SET_BIT(gpe_register_info->enable_for_run, register_bit);
break;
case ACPI_GPE_TYPE_WAKE_RUN:
ACPI_SET_BIT(gpe_register_info->enable_for_wake, register_bit);
ACPI_SET_BIT(gpe_register_info->enable_for_run, register_bit);
break;
default:
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_enable_gpe
*
* PARAMETERS: gpe_event_info - GPE to enable
* write_to_hardware - Enable now, or just mark data structs
* (WAKE GPEs should be deferred)
*
* RETURN: Status
*
* DESCRIPTION: Enable a GPE based on the GPE type
*
******************************************************************************/
acpi_status
acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info,
u8 write_to_hardware)
{
acpi_status status;
ACPI_FUNCTION_TRACE("ev_enable_gpe");
/* Make sure HW enable masks are updated */
status =
acpi_ev_update_gpe_enable_masks(gpe_event_info, ACPI_GPE_ENABLE);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Mark wake-enabled or HW enable, or both */
switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
case ACPI_GPE_TYPE_WAKE:
ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
break;
case ACPI_GPE_TYPE_WAKE_RUN:
ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
/*lint -fallthrough */
case ACPI_GPE_TYPE_RUNTIME:
ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_RUN_ENABLED);
if (write_to_hardware) {
/* Clear the GPE (of stale events), then enable it */
status = acpi_hw_clear_gpe(gpe_event_info);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Enable the requested runtime GPE */
status = acpi_hw_write_gpe_enable_reg(gpe_event_info);
}
break;
default:
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_disable_gpe
*
* PARAMETERS: gpe_event_info - GPE to disable
*
* RETURN: Status
*
* DESCRIPTION: Disable a GPE based on the GPE type
*
******************************************************************************/
acpi_status acpi_ev_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
{
acpi_status status;
ACPI_FUNCTION_TRACE("ev_disable_gpe");
if (!(gpe_event_info->flags & ACPI_GPE_ENABLE_MASK)) {
return_ACPI_STATUS(AE_OK);
}
/* Make sure HW enable masks are updated */
status =
acpi_ev_update_gpe_enable_masks(gpe_event_info, ACPI_GPE_DISABLE);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Mark wake-disabled or HW disable, or both */
switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
case ACPI_GPE_TYPE_WAKE:
ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
break;
case ACPI_GPE_TYPE_WAKE_RUN:
ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
/*lint -fallthrough */
case ACPI_GPE_TYPE_RUNTIME:
/* Disable the requested runtime GPE */
ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_RUN_ENABLED);
status = acpi_hw_write_gpe_enable_reg(gpe_event_info);
break;
default:
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_get_gpe_event_info
*
* PARAMETERS: gpe_device - Device node. NULL for GPE0/GPE1
* gpe_number - Raw GPE number
*
* RETURN: A GPE event_info struct. NULL if not a valid GPE
*
* DESCRIPTION: Returns the event_info struct associated with this GPE.
* Validates the gpe_block and the gpe_number
*
* Should be called only when the GPE lists are semaphore locked
* and not subject to change.
*
******************************************************************************/
struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device,
u32 gpe_number)
{
union acpi_operand_object *obj_desc;
struct acpi_gpe_block_info *gpe_block;
acpi_native_uint i;
ACPI_FUNCTION_ENTRY();
/* A NULL gpe_block means use the FADT-defined GPE block(s) */
if (!gpe_device) {
/* Examine GPE Block 0 and 1 (These blocks are permanent) */
for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) {
gpe_block = acpi_gbl_gpe_fadt_blocks[i];
if (gpe_block) {
if ((gpe_number >= gpe_block->block_base_number)
&& (gpe_number <
gpe_block->block_base_number +
(gpe_block->register_count * 8))) {
return (&gpe_block->
event_info[gpe_number -
gpe_block->
block_base_number]);
}
}
}
/* The gpe_number was not in the range of either FADT GPE block */
return (NULL);
}
/* A Non-NULL gpe_device means this is a GPE Block Device */
obj_desc =
acpi_ns_get_attached_object((struct acpi_namespace_node *)
gpe_device);
if (!obj_desc || !obj_desc->device.gpe_block) {
return (NULL);
}
gpe_block = obj_desc->device.gpe_block;
if ((gpe_number >= gpe_block->block_base_number) &&
(gpe_number <
gpe_block->block_base_number + (gpe_block->register_count * 8))) {
return (&gpe_block->
event_info[gpe_number - gpe_block->block_base_number]);
}
return (NULL);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_gpe_detect
*
* PARAMETERS: gpe_xrupt_list - Interrupt block for this interrupt.
* Can have multiple GPE blocks attached.
*
* RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
*
* DESCRIPTION: Detect if any GP events have occurred. This function is
* executed at interrupt level.
*
******************************************************************************/
u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
{
u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
u8 enabled_status_byte;
struct acpi_gpe_register_info *gpe_register_info;
u32 status_reg;
u32 enable_reg;
u32 flags;
acpi_status status;
struct acpi_gpe_block_info *gpe_block;
acpi_native_uint i;
acpi_native_uint j;
ACPI_FUNCTION_NAME("ev_gpe_detect");
/* Check for the case where there are no GPEs */
if (!gpe_xrupt_list) {
return (int_status);
}
/* Examine all GPE blocks attached to this interrupt level */
flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
gpe_block = gpe_xrupt_list->gpe_block_list_head;
while (gpe_block) {
/*
* Read all of the 8-bit GPE status and enable registers
* in this GPE block, saving all of them.
* Find all currently active GP events.
*/
for (i = 0; i < gpe_block->register_count; i++) {
/* Get the next status/enable pair */
gpe_register_info = &gpe_block->register_info[i];
/* Read the Status Register */
status =
acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH,
&status_reg,
&gpe_register_info->
status_address);
if (ACPI_FAILURE(status)) {
goto unlock_and_exit;
}
/* Read the Enable Register */
status =
acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH,
&enable_reg,
&gpe_register_info->
enable_address);
if (ACPI_FAILURE(status)) {
goto unlock_and_exit;
}
ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
"Read GPE Register at GPE%X: Status=%02X, Enable=%02X\n",
gpe_register_info->base_gpe_number,
status_reg, enable_reg));
/* Check if there is anything active at all in this register */
enabled_status_byte = (u8) (status_reg & enable_reg);
if (!enabled_status_byte) {
/* No active GPEs in this register, move on */
continue;
}
/* Now look at the individual GPEs in this byte register */
for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
/* Examine one GPE bit */
if (enabled_status_byte &
acpi_gbl_decode_to8bit[j]) {
/*
* Found an active GPE. Dispatch the event to a handler
* or method.
*/
int_status |=
acpi_ev_gpe_dispatch(&gpe_block->
event_info[(i *
ACPI_GPE_REGISTER_WIDTH)
+
j],
(u32) j +
gpe_register_info->
base_gpe_number);
}
}
}
gpe_block = gpe_block->next;
}
unlock_and_exit:
acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
return (int_status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_asynch_execute_gpe_method
*
* PARAMETERS: Context (gpe_event_info) - Info for this GPE
*
* RETURN: None
*
* DESCRIPTION: Perform the actual execution of a GPE control method. This
* function is called from an invocation of acpi_os_queue_for_execution
* (and therefore does NOT execute at interrupt level) so that
* the control method itself is not executed in the context of
* an interrupt handler.
*
******************************************************************************/
static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
{
struct acpi_gpe_event_info *gpe_event_info = (void *)context;
u32 gpe_number = 0;
acpi_status status;
struct acpi_gpe_event_info local_gpe_event_info;
struct acpi_parameter_info info;
ACPI_FUNCTION_TRACE("ev_asynch_execute_gpe_method");
status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
if (ACPI_FAILURE(status)) {
return_VOID;
}
/* Must revalidate the gpe_number/gpe_block */
if (!acpi_ev_valid_gpe_event(gpe_event_info)) {
status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
return_VOID;
}
/* Set the GPE flags for return to enabled state */
(void)acpi_ev_enable_gpe(gpe_event_info, FALSE);
/*
* Take a snapshot of the GPE info for this level - we copy the
* info to prevent a race condition with remove_handler/remove_block.
*/
ACPI_MEMCPY(&local_gpe_event_info, gpe_event_info,
sizeof(struct acpi_gpe_event_info));
status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
if (ACPI_FAILURE(status)) {
return_VOID;
}
/*
* Must check for control method type dispatch one more
* time to avoid race with ev_gpe_install_handler
*/
if ((local_gpe_event_info.flags & ACPI_GPE_DISPATCH_MASK) ==
ACPI_GPE_DISPATCH_METHOD) {
/*
* Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the _Lxx/_Exx
* control method that corresponds to this GPE
*/
info.node = local_gpe_event_info.dispatch.method_node;
info.parameters =
ACPI_CAST_PTR(union acpi_operand_object *, gpe_event_info);
info.parameter_type = ACPI_PARAM_GPE;
status = acpi_ns_evaluate_by_handle(&info);
if (ACPI_FAILURE(status)) {
ACPI_REPORT_ERROR(("%s while evaluating method [%4.4s] for GPE[%2X]\n", acpi_format_exception(status), acpi_ut_get_node_name(local_gpe_event_info.dispatch.method_node), gpe_number));
}
}
if ((local_gpe_event_info.flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
ACPI_GPE_LEVEL_TRIGGERED) {
/*
* GPE is level-triggered, we clear the GPE status bit after
* handling the event.
*/
status = acpi_hw_clear_gpe(&local_gpe_event_info);
if (ACPI_FAILURE(status)) {
return_VOID;
}
}
/* Enable this GPE */
(void)acpi_hw_write_gpe_enable_reg(&local_gpe_event_info);
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_gpe_dispatch
*
* PARAMETERS: gpe_event_info - Info for this GPE
* gpe_number - Number relative to the parent GPE block
*
* RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
*
* DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
* or method (e.g. _Lxx/_Exx) handler.
*
* This function executes at interrupt level.
*
******************************************************************************/
u32
acpi_ev_gpe_dispatch(struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
{
acpi_status status;
ACPI_FUNCTION_TRACE("ev_gpe_dispatch");
/*
* If edge-triggered, clear the GPE status bit now. Note that
* level-triggered events are cleared after the GPE is serviced.
*/
if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
ACPI_GPE_EDGE_TRIGGERED) {
status = acpi_hw_clear_gpe(gpe_event_info);
if (ACPI_FAILURE(status)) {
ACPI_REPORT_ERROR(("acpi_ev_gpe_dispatch: %s, Unable to clear GPE[%2X]\n", acpi_format_exception(status), gpe_number));
return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
}
}
/* Save current system state */
if (acpi_gbl_system_awake_and_running) {
ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_SYSTEM_RUNNING);
} else {
ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_SYSTEM_RUNNING);
}
/*
* Dispatch the GPE to either an installed handler, or the control
* method associated with this GPE (_Lxx or _Exx).
* If a handler exists, we invoke it and do not attempt to run the method.
* If there is neither a handler nor a method, we disable the level to
* prevent further events from coming in here.
*/
switch (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) {
case ACPI_GPE_DISPATCH_HANDLER:
/*
* Invoke the installed handler (at interrupt level)
* Ignore return status for now. TBD: leave GPE disabled on error?
*/
(void)gpe_event_info->dispatch.handler->address(gpe_event_info->
dispatch.
handler->
context);
/* It is now safe to clear level-triggered events. */
if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
ACPI_GPE_LEVEL_TRIGGERED) {
status = acpi_hw_clear_gpe(gpe_event_info);
if (ACPI_FAILURE(status)) {
ACPI_REPORT_ERROR(("acpi_ev_gpe_dispatch: %s, Unable to clear GPE[%2X]\n", acpi_format_exception(status), gpe_number));
return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
}
}
break;
case ACPI_GPE_DISPATCH_METHOD:
/*
* Disable GPE, so it doesn't keep firing before the method has a
* chance to run.
*/
status = acpi_ev_disable_gpe(gpe_event_info);
if (ACPI_FAILURE(status)) {
ACPI_REPORT_ERROR(("acpi_ev_gpe_dispatch: %s, Unable to disable GPE[%2X]\n", acpi_format_exception(status), gpe_number));
return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
}
/*
* Execute the method associated with the GPE
* NOTE: Level-triggered GPEs are cleared after the method completes.
*/
status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
acpi_ev_asynch_execute_gpe_method,
gpe_event_info);
if (ACPI_FAILURE(status)) {
ACPI_REPORT_ERROR(("acpi_ev_gpe_dispatch: %s, Unable to queue handler for GPE[%2X] - event disabled\n", acpi_format_exception(status), gpe_number));
}
break;
default:
/* No handler or method to run! */
ACPI_REPORT_ERROR(("acpi_ev_gpe_dispatch: No handler or method for GPE[%2X], disabling event\n", gpe_number));
/*
* Disable the GPE. The GPE will remain disabled until the ACPI
* Core Subsystem is restarted, or a handler is installed.
*/
status = acpi_ev_disable_gpe(gpe_event_info);
if (ACPI_FAILURE(status)) {
ACPI_REPORT_ERROR(("acpi_ev_gpe_dispatch: %s, Unable to disable GPE[%2X]\n", acpi_format_exception(status), gpe_number));
return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
}
break;
}
return_UINT32(ACPI_INTERRUPT_HANDLED);
}
#ifdef ACPI_GPE_NOTIFY_CHECK
/*******************************************************************************
* TBD: NOT USED, PROTOTYPE ONLY AND WILL PROBABLY BE REMOVED
*
* FUNCTION: acpi_ev_check_for_wake_only_gpe
*
* PARAMETERS: gpe_event_info - info for this GPE
*
* RETURN: Status
*
* DESCRIPTION: Determine if a a GPE is "wake-only".
*
* Called from Notify() code in interpreter when a "device_wake"
* Notify comes in.
*
******************************************************************************/
acpi_status
acpi_ev_check_for_wake_only_gpe(struct acpi_gpe_event_info *gpe_event_info)
{
acpi_status status;
ACPI_FUNCTION_TRACE("ev_check_for_wake_only_gpe");
if ((gpe_event_info) && /* Only >0 for _Lxx/_Exx */
((gpe_event_info->flags & ACPI_GPE_SYSTEM_MASK) == ACPI_GPE_SYSTEM_RUNNING)) { /* System state at GPE time */
/* This must be a wake-only GPE, disable it */
status = acpi_ev_disable_gpe(gpe_event_info);
/* Set GPE to wake-only. Do not change wake disabled/enabled status */
acpi_ev_set_gpe_type(gpe_event_info, ACPI_GPE_TYPE_WAKE);
ACPI_REPORT_INFO(("GPE %p was updated from wake/run to wake-only\n", gpe_event_info));
/* This was a wake-only GPE */
return_ACPI_STATUS(AE_WAKE_ONLY_GPE);
}
return_ACPI_STATUS(AE_OK);
}
#endif
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