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1079 lines
30 KiB
1079 lines
30 KiB
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
|
/****************************************************************************** |
|
* |
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* Module Name: evxface - External interfaces for ACPI events |
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* |
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* Copyright (C) 2000 - 2021, Intel Corp. |
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* |
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*****************************************************************************/ |
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|
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#define EXPORT_ACPI_INTERFACES |
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|
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#include <acpi/acpi.h> |
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#include "accommon.h" |
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#include "acnamesp.h" |
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#include "acevents.h" |
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#include "acinterp.h" |
|
|
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#define _COMPONENT ACPI_EVENTS |
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ACPI_MODULE_NAME("evxface") |
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#if (!ACPI_REDUCED_HARDWARE) |
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/* Local prototypes */ |
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static acpi_status |
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acpi_ev_install_gpe_handler(acpi_handle gpe_device, |
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u32 gpe_number, |
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u32 type, |
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u8 is_raw_handler, |
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acpi_gpe_handler address, void *context); |
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|
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#endif |
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|
|
|
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/******************************************************************************* |
|
* |
|
* FUNCTION: acpi_install_notify_handler |
|
* |
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* PARAMETERS: device - The device for which notifies will be handled |
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* handler_type - The type of handler: |
|
* ACPI_SYSTEM_NOTIFY: System Handler (00-7F) |
|
* ACPI_DEVICE_NOTIFY: Device Handler (80-FF) |
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* ACPI_ALL_NOTIFY: Both System and Device |
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* handler - Address of the handler |
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* context - Value passed to the handler on each GPE |
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* |
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* RETURN: Status |
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* |
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* DESCRIPTION: Install a handler for notifications on an ACPI Device, |
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* thermal_zone, or Processor object. |
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* |
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* NOTES: The Root namespace object may have only one handler for each |
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* type of notify (System/Device). Device/Thermal/Processor objects |
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* may have one device notify handler, and multiple system notify |
|
* handlers. |
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* |
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******************************************************************************/ |
|
|
|
acpi_status |
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acpi_install_notify_handler(acpi_handle device, |
|
u32 handler_type, |
|
acpi_notify_handler handler, void *context) |
|
{ |
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struct acpi_namespace_node *node = |
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ACPI_CAST_PTR(struct acpi_namespace_node, device); |
|
union acpi_operand_object *obj_desc; |
|
union acpi_operand_object *handler_obj; |
|
acpi_status status; |
|
u32 i; |
|
|
|
ACPI_FUNCTION_TRACE(acpi_install_notify_handler); |
|
|
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/* Parameter validation */ |
|
|
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if ((!device) || (!handler) || (!handler_type) || |
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(handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) { |
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return_ACPI_STATUS(AE_BAD_PARAMETER); |
|
} |
|
|
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status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
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if (ACPI_FAILURE(status)) { |
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return_ACPI_STATUS(status); |
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} |
|
|
|
/* |
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* Root Object: |
|
* Registering a notify handler on the root object indicates that the |
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* caller wishes to receive notifications for all objects. Note that |
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* only one global handler can be registered per notify type. |
|
* Ensure that a handler is not already installed. |
|
*/ |
|
if (device == ACPI_ROOT_OBJECT) { |
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for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) { |
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if (handler_type & (i + 1)) { |
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if (acpi_gbl_global_notify[i].handler) { |
|
status = AE_ALREADY_EXISTS; |
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goto unlock_and_exit; |
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} |
|
|
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acpi_gbl_global_notify[i].handler = handler; |
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acpi_gbl_global_notify[i].context = context; |
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} |
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} |
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|
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goto unlock_and_exit; /* Global notify handler installed, all done */ |
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} |
|
|
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/* |
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* All Other Objects: |
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* Caller will only receive notifications specific to the target |
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* object. Note that only certain object types are allowed to |
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* receive notifications. |
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*/ |
|
|
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/* Are Notifies allowed on this object? */ |
|
|
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if (!acpi_ev_is_notify_object(node)) { |
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status = AE_TYPE; |
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goto unlock_and_exit; |
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} |
|
|
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/* Check for an existing internal object, might not exist */ |
|
|
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obj_desc = acpi_ns_get_attached_object(node); |
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if (!obj_desc) { |
|
|
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/* Create a new object */ |
|
|
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obj_desc = acpi_ut_create_internal_object(node->type); |
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if (!obj_desc) { |
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status = AE_NO_MEMORY; |
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goto unlock_and_exit; |
|
} |
|
|
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/* Attach new object to the Node, remove local reference */ |
|
|
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status = acpi_ns_attach_object(device, obj_desc, node->type); |
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acpi_ut_remove_reference(obj_desc); |
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if (ACPI_FAILURE(status)) { |
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goto unlock_and_exit; |
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} |
|
} |
|
|
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/* Ensure that the handler is not already installed in the lists */ |
|
|
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for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) { |
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if (handler_type & (i + 1)) { |
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handler_obj = obj_desc->common_notify.notify_list[i]; |
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while (handler_obj) { |
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if (handler_obj->notify.handler == handler) { |
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status = AE_ALREADY_EXISTS; |
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goto unlock_and_exit; |
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} |
|
|
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handler_obj = handler_obj->notify.next[i]; |
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} |
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} |
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} |
|
|
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/* Create and populate a new notify handler object */ |
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|
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handler_obj = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_NOTIFY); |
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if (!handler_obj) { |
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status = AE_NO_MEMORY; |
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goto unlock_and_exit; |
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} |
|
|
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handler_obj->notify.node = node; |
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handler_obj->notify.handler_type = handler_type; |
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handler_obj->notify.handler = handler; |
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handler_obj->notify.context = context; |
|
|
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/* Install the handler at the list head(s) */ |
|
|
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for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) { |
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if (handler_type & (i + 1)) { |
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handler_obj->notify.next[i] = |
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obj_desc->common_notify.notify_list[i]; |
|
|
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obj_desc->common_notify.notify_list[i] = handler_obj; |
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} |
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} |
|
|
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/* Add an extra reference if handler was installed in both lists */ |
|
|
|
if (handler_type == ACPI_ALL_NOTIFY) { |
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acpi_ut_add_reference(handler_obj); |
|
} |
|
|
|
unlock_and_exit: |
|
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
|
return_ACPI_STATUS(status); |
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} |
|
|
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ACPI_EXPORT_SYMBOL(acpi_install_notify_handler) |
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|
|
/******************************************************************************* |
|
* |
|
* FUNCTION: acpi_remove_notify_handler |
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* |
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* PARAMETERS: device - The device for which the handler is installed |
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* handler_type - The type of handler: |
|
* ACPI_SYSTEM_NOTIFY: System Handler (00-7F) |
|
* ACPI_DEVICE_NOTIFY: Device Handler (80-FF) |
|
* ACPI_ALL_NOTIFY: Both System and Device |
|
* handler - Address of the handler |
|
* |
|
* RETURN: Status |
|
* |
|
* DESCRIPTION: Remove a handler for notifies on an ACPI device |
|
* |
|
******************************************************************************/ |
|
acpi_status |
|
acpi_remove_notify_handler(acpi_handle device, |
|
u32 handler_type, acpi_notify_handler handler) |
|
{ |
|
struct acpi_namespace_node *node = |
|
ACPI_CAST_PTR(struct acpi_namespace_node, device); |
|
union acpi_operand_object *obj_desc; |
|
union acpi_operand_object *handler_obj; |
|
union acpi_operand_object *previous_handler_obj; |
|
acpi_status status = AE_OK; |
|
u32 i; |
|
|
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ACPI_FUNCTION_TRACE(acpi_remove_notify_handler); |
|
|
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/* Parameter validation */ |
|
|
|
if ((!device) || (!handler) || (!handler_type) || |
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(handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) { |
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return_ACPI_STATUS(AE_BAD_PARAMETER); |
|
} |
|
|
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/* Root Object. Global handlers are removed here */ |
|
|
|
if (device == ACPI_ROOT_OBJECT) { |
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for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) { |
|
if (handler_type & (i + 1)) { |
|
status = |
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acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
|
if (ACPI_FAILURE(status)) { |
|
return_ACPI_STATUS(status); |
|
} |
|
|
|
if (!acpi_gbl_global_notify[i].handler || |
|
(acpi_gbl_global_notify[i].handler != |
|
handler)) { |
|
status = AE_NOT_EXIST; |
|
goto unlock_and_exit; |
|
} |
|
|
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
|
"Removing global notify handler\n")); |
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|
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acpi_gbl_global_notify[i].handler = NULL; |
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acpi_gbl_global_notify[i].context = NULL; |
|
|
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(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
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|
|
/* Make sure all deferred notify tasks are completed */ |
|
|
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acpi_os_wait_events_complete(); |
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} |
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} |
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|
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return_ACPI_STATUS(AE_OK); |
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} |
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|
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/* All other objects: Are Notifies allowed on this object? */ |
|
|
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if (!acpi_ev_is_notify_object(node)) { |
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return_ACPI_STATUS(AE_TYPE); |
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} |
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|
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/* Must have an existing internal object */ |
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|
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obj_desc = acpi_ns_get_attached_object(node); |
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if (!obj_desc) { |
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return_ACPI_STATUS(AE_NOT_EXIST); |
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} |
|
|
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/* Internal object exists. Find the handler and remove it */ |
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|
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for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) { |
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if (handler_type & (i + 1)) { |
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status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
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if (ACPI_FAILURE(status)) { |
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return_ACPI_STATUS(status); |
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} |
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|
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handler_obj = obj_desc->common_notify.notify_list[i]; |
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previous_handler_obj = NULL; |
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|
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/* Attempt to find the handler in the handler list */ |
|
|
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while (handler_obj && |
|
(handler_obj->notify.handler != handler)) { |
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previous_handler_obj = handler_obj; |
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handler_obj = handler_obj->notify.next[i]; |
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} |
|
|
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if (!handler_obj) { |
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status = AE_NOT_EXIST; |
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goto unlock_and_exit; |
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} |
|
|
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/* Remove the handler object from the list */ |
|
|
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if (previous_handler_obj) { /* Handler is not at the list head */ |
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previous_handler_obj->notify.next[i] = |
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handler_obj->notify.next[i]; |
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} else { /* Handler is at the list head */ |
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|
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obj_desc->common_notify.notify_list[i] = |
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handler_obj->notify.next[i]; |
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} |
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|
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(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
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|
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/* Make sure all deferred notify tasks are completed */ |
|
|
|
acpi_os_wait_events_complete(); |
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acpi_ut_remove_reference(handler_obj); |
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} |
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} |
|
|
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return_ACPI_STATUS(status); |
|
|
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unlock_and_exit: |
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(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
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return_ACPI_STATUS(status); |
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} |
|
|
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ACPI_EXPORT_SYMBOL(acpi_remove_notify_handler) |
|
|
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_install_exception_handler |
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* |
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* PARAMETERS: handler - Pointer to the handler function for the |
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* event |
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* |
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* RETURN: Status |
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* |
|
* DESCRIPTION: Saves the pointer to the handler function |
|
* |
|
******************************************************************************/ |
|
#ifdef ACPI_FUTURE_USAGE |
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acpi_status acpi_install_exception_handler(acpi_exception_handler handler) |
|
{ |
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acpi_status status; |
|
|
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ACPI_FUNCTION_TRACE(acpi_install_exception_handler); |
|
|
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status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
|
if (ACPI_FAILURE(status)) { |
|
return_ACPI_STATUS(status); |
|
} |
|
|
|
/* Don't allow two handlers. */ |
|
|
|
if (acpi_gbl_exception_handler) { |
|
status = AE_ALREADY_EXISTS; |
|
goto cleanup; |
|
} |
|
|
|
/* Install the handler */ |
|
|
|
acpi_gbl_exception_handler = handler; |
|
|
|
cleanup: |
|
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); |
|
return_ACPI_STATUS(status); |
|
} |
|
|
|
ACPI_EXPORT_SYMBOL(acpi_install_exception_handler) |
|
#endif |
|
|
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#if (!ACPI_REDUCED_HARDWARE) |
|
/******************************************************************************* |
|
* |
|
* FUNCTION: acpi_install_sci_handler |
|
* |
|
* PARAMETERS: address - Address of the handler |
|
* context - Value passed to the handler on each SCI |
|
* |
|
* RETURN: Status |
|
* |
|
* DESCRIPTION: Install a handler for a System Control Interrupt. |
|
* |
|
******************************************************************************/ |
|
acpi_status acpi_install_sci_handler(acpi_sci_handler address, void *context) |
|
{ |
|
struct acpi_sci_handler_info *new_sci_handler; |
|
struct acpi_sci_handler_info *sci_handler; |
|
acpi_cpu_flags flags; |
|
acpi_status status; |
|
|
|
ACPI_FUNCTION_TRACE(acpi_install_sci_handler); |
|
|
|
if (!address) { |
|
return_ACPI_STATUS(AE_BAD_PARAMETER); |
|
} |
|
|
|
/* Allocate and init a handler object */ |
|
|
|
new_sci_handler = ACPI_ALLOCATE(sizeof(struct acpi_sci_handler_info)); |
|
if (!new_sci_handler) { |
|
return_ACPI_STATUS(AE_NO_MEMORY); |
|
} |
|
|
|
new_sci_handler->address = address; |
|
new_sci_handler->context = context; |
|
|
|
status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
|
if (ACPI_FAILURE(status)) { |
|
goto exit; |
|
} |
|
|
|
/* Lock list during installation */ |
|
|
|
flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); |
|
sci_handler = acpi_gbl_sci_handler_list; |
|
|
|
/* Ensure handler does not already exist */ |
|
|
|
while (sci_handler) { |
|
if (address == sci_handler->address) { |
|
status = AE_ALREADY_EXISTS; |
|
goto unlock_and_exit; |
|
} |
|
|
|
sci_handler = sci_handler->next; |
|
} |
|
|
|
/* Install the new handler into the global list (at head) */ |
|
|
|
new_sci_handler->next = acpi_gbl_sci_handler_list; |
|
acpi_gbl_sci_handler_list = new_sci_handler; |
|
|
|
unlock_and_exit: |
|
|
|
acpi_os_release_lock(acpi_gbl_gpe_lock, flags); |
|
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); |
|
|
|
exit: |
|
if (ACPI_FAILURE(status)) { |
|
ACPI_FREE(new_sci_handler); |
|
} |
|
return_ACPI_STATUS(status); |
|
} |
|
|
|
ACPI_EXPORT_SYMBOL(acpi_install_sci_handler) |
|
|
|
/******************************************************************************* |
|
* |
|
* FUNCTION: acpi_remove_sci_handler |
|
* |
|
* PARAMETERS: address - Address of the handler |
|
* |
|
* RETURN: Status |
|
* |
|
* DESCRIPTION: Remove a handler for a System Control Interrupt. |
|
* |
|
******************************************************************************/ |
|
acpi_status acpi_remove_sci_handler(acpi_sci_handler address) |
|
{ |
|
struct acpi_sci_handler_info *prev_sci_handler; |
|
struct acpi_sci_handler_info *next_sci_handler; |
|
acpi_cpu_flags flags; |
|
acpi_status status; |
|
|
|
ACPI_FUNCTION_TRACE(acpi_remove_sci_handler); |
|
|
|
if (!address) { |
|
return_ACPI_STATUS(AE_BAD_PARAMETER); |
|
} |
|
|
|
status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
|
if (ACPI_FAILURE(status)) { |
|
return_ACPI_STATUS(status); |
|
} |
|
|
|
/* Remove the SCI handler with lock */ |
|
|
|
flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); |
|
|
|
prev_sci_handler = NULL; |
|
next_sci_handler = acpi_gbl_sci_handler_list; |
|
while (next_sci_handler) { |
|
if (next_sci_handler->address == address) { |
|
|
|
/* Unlink and free the SCI handler info block */ |
|
|
|
if (prev_sci_handler) { |
|
prev_sci_handler->next = next_sci_handler->next; |
|
} else { |
|
acpi_gbl_sci_handler_list = |
|
next_sci_handler->next; |
|
} |
|
|
|
acpi_os_release_lock(acpi_gbl_gpe_lock, flags); |
|
ACPI_FREE(next_sci_handler); |
|
goto unlock_and_exit; |
|
} |
|
|
|
prev_sci_handler = next_sci_handler; |
|
next_sci_handler = next_sci_handler->next; |
|
} |
|
|
|
acpi_os_release_lock(acpi_gbl_gpe_lock, flags); |
|
status = AE_NOT_EXIST; |
|
|
|
unlock_and_exit: |
|
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); |
|
return_ACPI_STATUS(status); |
|
} |
|
|
|
ACPI_EXPORT_SYMBOL(acpi_remove_sci_handler) |
|
|
|
/******************************************************************************* |
|
* |
|
* FUNCTION: acpi_install_global_event_handler |
|
* |
|
* PARAMETERS: handler - Pointer to the global event handler function |
|
* context - Value passed to the handler on each event |
|
* |
|
* RETURN: Status |
|
* |
|
* DESCRIPTION: Saves the pointer to the handler function. The global handler |
|
* is invoked upon each incoming GPE and Fixed Event. It is |
|
* invoked at interrupt level at the time of the event dispatch. |
|
* Can be used to update event counters, etc. |
|
* |
|
******************************************************************************/ |
|
acpi_status |
|
acpi_install_global_event_handler(acpi_gbl_event_handler handler, void *context) |
|
{ |
|
acpi_status status; |
|
|
|
ACPI_FUNCTION_TRACE(acpi_install_global_event_handler); |
|
|
|
/* Parameter validation */ |
|
|
|
if (!handler) { |
|
return_ACPI_STATUS(AE_BAD_PARAMETER); |
|
} |
|
|
|
status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
|
if (ACPI_FAILURE(status)) { |
|
return_ACPI_STATUS(status); |
|
} |
|
|
|
/* Don't allow two handlers. */ |
|
|
|
if (acpi_gbl_global_event_handler) { |
|
status = AE_ALREADY_EXISTS; |
|
goto cleanup; |
|
} |
|
|
|
acpi_gbl_global_event_handler = handler; |
|
acpi_gbl_global_event_handler_context = context; |
|
|
|
cleanup: |
|
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); |
|
return_ACPI_STATUS(status); |
|
} |
|
|
|
ACPI_EXPORT_SYMBOL(acpi_install_global_event_handler) |
|
|
|
/******************************************************************************* |
|
* |
|
* FUNCTION: acpi_install_fixed_event_handler |
|
* |
|
* PARAMETERS: event - Event type to enable. |
|
* handler - Pointer to the handler function for the |
|
* event |
|
* context - Value passed to the handler on each GPE |
|
* |
|
* RETURN: Status |
|
* |
|
* DESCRIPTION: Saves the pointer to the handler function and then enables the |
|
* event. |
|
* |
|
******************************************************************************/ |
|
acpi_status |
|
acpi_install_fixed_event_handler(u32 event, |
|
acpi_event_handler handler, void *context) |
|
{ |
|
acpi_status status; |
|
|
|
ACPI_FUNCTION_TRACE(acpi_install_fixed_event_handler); |
|
|
|
/* Parameter validation */ |
|
|
|
if (event > ACPI_EVENT_MAX) { |
|
return_ACPI_STATUS(AE_BAD_PARAMETER); |
|
} |
|
|
|
status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
|
if (ACPI_FAILURE(status)) { |
|
return_ACPI_STATUS(status); |
|
} |
|
|
|
/* Do not allow multiple handlers */ |
|
|
|
if (acpi_gbl_fixed_event_handlers[event].handler) { |
|
status = AE_ALREADY_EXISTS; |
|
goto cleanup; |
|
} |
|
|
|
/* Install the handler before enabling the event */ |
|
|
|
acpi_gbl_fixed_event_handlers[event].handler = handler; |
|
acpi_gbl_fixed_event_handlers[event].context = context; |
|
|
|
status = acpi_clear_event(event); |
|
if (ACPI_SUCCESS(status)) |
|
status = acpi_enable_event(event, 0); |
|
if (ACPI_FAILURE(status)) { |
|
ACPI_WARNING((AE_INFO, |
|
"Could not enable fixed event - %s (%u)", |
|
acpi_ut_get_event_name(event), event)); |
|
|
|
/* Remove the handler */ |
|
|
|
acpi_gbl_fixed_event_handlers[event].handler = NULL; |
|
acpi_gbl_fixed_event_handlers[event].context = NULL; |
|
} else { |
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
|
"Enabled fixed event %s (%X), Handler=%p\n", |
|
acpi_ut_get_event_name(event), event, |
|
handler)); |
|
} |
|
|
|
cleanup: |
|
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); |
|
return_ACPI_STATUS(status); |
|
} |
|
|
|
ACPI_EXPORT_SYMBOL(acpi_install_fixed_event_handler) |
|
|
|
/******************************************************************************* |
|
* |
|
* FUNCTION: acpi_remove_fixed_event_handler |
|
* |
|
* PARAMETERS: event - Event type to disable. |
|
* handler - Address of the handler |
|
* |
|
* RETURN: Status |
|
* |
|
* DESCRIPTION: Disables the event and unregisters the event handler. |
|
* |
|
******************************************************************************/ |
|
acpi_status |
|
acpi_remove_fixed_event_handler(u32 event, acpi_event_handler handler) |
|
{ |
|
acpi_status status = AE_OK; |
|
|
|
ACPI_FUNCTION_TRACE(acpi_remove_fixed_event_handler); |
|
|
|
/* Parameter validation */ |
|
|
|
if (event > ACPI_EVENT_MAX) { |
|
return_ACPI_STATUS(AE_BAD_PARAMETER); |
|
} |
|
|
|
status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
|
if (ACPI_FAILURE(status)) { |
|
return_ACPI_STATUS(status); |
|
} |
|
|
|
/* Disable the event before removing the handler */ |
|
|
|
status = acpi_disable_event(event, 0); |
|
|
|
/* Always Remove the handler */ |
|
|
|
acpi_gbl_fixed_event_handlers[event].handler = NULL; |
|
acpi_gbl_fixed_event_handlers[event].context = NULL; |
|
|
|
if (ACPI_FAILURE(status)) { |
|
ACPI_WARNING((AE_INFO, |
|
"Could not disable fixed event - %s (%u)", |
|
acpi_ut_get_event_name(event), event)); |
|
} else { |
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
|
"Disabled fixed event - %s (%X)\n", |
|
acpi_ut_get_event_name(event), event)); |
|
} |
|
|
|
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); |
|
return_ACPI_STATUS(status); |
|
} |
|
|
|
ACPI_EXPORT_SYMBOL(acpi_remove_fixed_event_handler) |
|
|
|
/******************************************************************************* |
|
* |
|
* FUNCTION: acpi_ev_install_gpe_handler |
|
* |
|
* PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT |
|
* defined GPEs) |
|
* gpe_number - The GPE number within the GPE block |
|
* type - Whether this GPE should be treated as an |
|
* edge- or level-triggered interrupt. |
|
* is_raw_handler - Whether this GPE should be handled using |
|
* the special GPE handler mode. |
|
* address - Address of the handler |
|
* context - Value passed to the handler on each GPE |
|
* |
|
* RETURN: Status |
|
* |
|
* DESCRIPTION: Internal function to install a handler for a General Purpose |
|
* Event. |
|
* |
|
******************************************************************************/ |
|
static acpi_status |
|
acpi_ev_install_gpe_handler(acpi_handle gpe_device, |
|
u32 gpe_number, |
|
u32 type, |
|
u8 is_raw_handler, |
|
acpi_gpe_handler address, void *context) |
|
{ |
|
struct acpi_gpe_event_info *gpe_event_info; |
|
struct acpi_gpe_handler_info *handler; |
|
acpi_status status; |
|
acpi_cpu_flags flags; |
|
|
|
ACPI_FUNCTION_TRACE(ev_install_gpe_handler); |
|
|
|
/* Parameter validation */ |
|
|
|
if ((!address) || (type & ~ACPI_GPE_XRUPT_TYPE_MASK)) { |
|
return_ACPI_STATUS(AE_BAD_PARAMETER); |
|
} |
|
|
|
status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
|
if (ACPI_FAILURE(status)) { |
|
return_ACPI_STATUS(status); |
|
} |
|
|
|
/* Allocate and init handler object (before lock) */ |
|
|
|
handler = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_handler_info)); |
|
if (!handler) { |
|
status = AE_NO_MEMORY; |
|
goto unlock_and_exit; |
|
} |
|
|
|
flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); |
|
|
|
/* Ensure that we have a valid GPE number */ |
|
|
|
gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number); |
|
if (!gpe_event_info) { |
|
status = AE_BAD_PARAMETER; |
|
goto free_and_exit; |
|
} |
|
|
|
/* Make sure that there isn't a handler there already */ |
|
|
|
if ((ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) == |
|
ACPI_GPE_DISPATCH_HANDLER) || |
|
(ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) == |
|
ACPI_GPE_DISPATCH_RAW_HANDLER)) { |
|
status = AE_ALREADY_EXISTS; |
|
goto free_and_exit; |
|
} |
|
|
|
handler->address = address; |
|
handler->context = context; |
|
handler->method_node = gpe_event_info->dispatch.method_node; |
|
handler->original_flags = (u8)(gpe_event_info->flags & |
|
(ACPI_GPE_XRUPT_TYPE_MASK | |
|
ACPI_GPE_DISPATCH_MASK)); |
|
|
|
/* |
|
* If the GPE is associated with a method, it may have been enabled |
|
* automatically during initialization, in which case it has to be |
|
* disabled now to avoid spurious execution of the handler. |
|
*/ |
|
if (((ACPI_GPE_DISPATCH_TYPE(handler->original_flags) == |
|
ACPI_GPE_DISPATCH_METHOD) || |
|
(ACPI_GPE_DISPATCH_TYPE(handler->original_flags) == |
|
ACPI_GPE_DISPATCH_NOTIFY)) && gpe_event_info->runtime_count) { |
|
handler->originally_enabled = TRUE; |
|
(void)acpi_ev_remove_gpe_reference(gpe_event_info); |
|
|
|
/* Sanity check of original type against new type */ |
|
|
|
if (type != |
|
(u32)(gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK)) { |
|
ACPI_WARNING((AE_INFO, |
|
"GPE type mismatch (level/edge)")); |
|
} |
|
} |
|
|
|
/* Install the handler */ |
|
|
|
gpe_event_info->dispatch.handler = handler; |
|
|
|
/* Setup up dispatch flags to indicate handler (vs. method/notify) */ |
|
|
|
gpe_event_info->flags &= |
|
~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK); |
|
gpe_event_info->flags |= |
|
(u8)(type | |
|
(is_raw_handler ? ACPI_GPE_DISPATCH_RAW_HANDLER : |
|
ACPI_GPE_DISPATCH_HANDLER)); |
|
|
|
acpi_os_release_lock(acpi_gbl_gpe_lock, flags); |
|
|
|
unlock_and_exit: |
|
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); |
|
return_ACPI_STATUS(status); |
|
|
|
free_and_exit: |
|
acpi_os_release_lock(acpi_gbl_gpe_lock, flags); |
|
ACPI_FREE(handler); |
|
goto unlock_and_exit; |
|
} |
|
|
|
/******************************************************************************* |
|
* |
|
* FUNCTION: acpi_install_gpe_handler |
|
* |
|
* PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT |
|
* defined GPEs) |
|
* gpe_number - The GPE number within the GPE block |
|
* type - Whether this GPE should be treated as an |
|
* edge- or level-triggered interrupt. |
|
* address - Address of the handler |
|
* context - Value passed to the handler on each GPE |
|
* |
|
* RETURN: Status |
|
* |
|
* DESCRIPTION: Install a handler for a General Purpose Event. |
|
* |
|
******************************************************************************/ |
|
|
|
acpi_status |
|
acpi_install_gpe_handler(acpi_handle gpe_device, |
|
u32 gpe_number, |
|
u32 type, acpi_gpe_handler address, void *context) |
|
{ |
|
acpi_status status; |
|
|
|
ACPI_FUNCTION_TRACE(acpi_install_gpe_handler); |
|
|
|
status = acpi_ev_install_gpe_handler(gpe_device, gpe_number, type, |
|
FALSE, address, context); |
|
|
|
return_ACPI_STATUS(status); |
|
} |
|
|
|
ACPI_EXPORT_SYMBOL(acpi_install_gpe_handler) |
|
|
|
/******************************************************************************* |
|
* |
|
* FUNCTION: acpi_install_gpe_raw_handler |
|
* |
|
* PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT |
|
* defined GPEs) |
|
* gpe_number - The GPE number within the GPE block |
|
* type - Whether this GPE should be treated as an |
|
* edge- or level-triggered interrupt. |
|
* address - Address of the handler |
|
* context - Value passed to the handler on each GPE |
|
* |
|
* RETURN: Status |
|
* |
|
* DESCRIPTION: Install a handler for a General Purpose Event. |
|
* |
|
******************************************************************************/ |
|
acpi_status |
|
acpi_install_gpe_raw_handler(acpi_handle gpe_device, |
|
u32 gpe_number, |
|
u32 type, acpi_gpe_handler address, void *context) |
|
{ |
|
acpi_status status; |
|
|
|
ACPI_FUNCTION_TRACE(acpi_install_gpe_raw_handler); |
|
|
|
status = acpi_ev_install_gpe_handler(gpe_device, gpe_number, type, |
|
TRUE, address, context); |
|
|
|
return_ACPI_STATUS(status); |
|
} |
|
|
|
ACPI_EXPORT_SYMBOL(acpi_install_gpe_raw_handler) |
|
|
|
/******************************************************************************* |
|
* |
|
* FUNCTION: acpi_remove_gpe_handler |
|
* |
|
* PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT |
|
* defined GPEs) |
|
* gpe_number - The event to remove a handler |
|
* address - Address of the handler |
|
* |
|
* RETURN: Status |
|
* |
|
* DESCRIPTION: Remove a handler for a General Purpose acpi_event. |
|
* |
|
******************************************************************************/ |
|
acpi_status |
|
acpi_remove_gpe_handler(acpi_handle gpe_device, |
|
u32 gpe_number, acpi_gpe_handler address) |
|
{ |
|
struct acpi_gpe_event_info *gpe_event_info; |
|
struct acpi_gpe_handler_info *handler; |
|
acpi_status status; |
|
acpi_cpu_flags flags; |
|
|
|
ACPI_FUNCTION_TRACE(acpi_remove_gpe_handler); |
|
|
|
/* Parameter validation */ |
|
|
|
if (!address) { |
|
return_ACPI_STATUS(AE_BAD_PARAMETER); |
|
} |
|
|
|
status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
|
if (ACPI_FAILURE(status)) { |
|
return_ACPI_STATUS(status); |
|
} |
|
|
|
flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); |
|
|
|
/* Ensure that we have a valid GPE number */ |
|
|
|
gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number); |
|
if (!gpe_event_info) { |
|
status = AE_BAD_PARAMETER; |
|
goto unlock_and_exit; |
|
} |
|
|
|
/* Make sure that a handler is indeed installed */ |
|
|
|
if ((ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) != |
|
ACPI_GPE_DISPATCH_HANDLER) && |
|
(ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) != |
|
ACPI_GPE_DISPATCH_RAW_HANDLER)) { |
|
status = AE_NOT_EXIST; |
|
goto unlock_and_exit; |
|
} |
|
|
|
/* Make sure that the installed handler is the same */ |
|
|
|
if (gpe_event_info->dispatch.handler->address != address) { |
|
status = AE_BAD_PARAMETER; |
|
goto unlock_and_exit; |
|
} |
|
|
|
/* Remove the handler */ |
|
|
|
handler = gpe_event_info->dispatch.handler; |
|
gpe_event_info->dispatch.handler = NULL; |
|
|
|
/* Restore Method node (if any), set dispatch flags */ |
|
|
|
gpe_event_info->dispatch.method_node = handler->method_node; |
|
gpe_event_info->flags &= |
|
~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK); |
|
gpe_event_info->flags |= handler->original_flags; |
|
|
|
/* |
|
* If the GPE was previously associated with a method and it was |
|
* enabled, it should be enabled at this point to restore the |
|
* post-initialization configuration. |
|
*/ |
|
if (((ACPI_GPE_DISPATCH_TYPE(handler->original_flags) == |
|
ACPI_GPE_DISPATCH_METHOD) || |
|
(ACPI_GPE_DISPATCH_TYPE(handler->original_flags) == |
|
ACPI_GPE_DISPATCH_NOTIFY)) && handler->originally_enabled) { |
|
(void)acpi_ev_add_gpe_reference(gpe_event_info, FALSE); |
|
if (ACPI_GPE_IS_POLLING_NEEDED(gpe_event_info)) { |
|
|
|
/* Poll edge triggered GPEs to handle existing events */ |
|
|
|
acpi_os_release_lock(acpi_gbl_gpe_lock, flags); |
|
(void)acpi_ev_detect_gpe(gpe_device, gpe_event_info, |
|
gpe_number); |
|
flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); |
|
} |
|
} |
|
|
|
acpi_os_release_lock(acpi_gbl_gpe_lock, flags); |
|
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); |
|
|
|
/* Make sure all deferred GPE tasks are completed */ |
|
|
|
acpi_os_wait_events_complete(); |
|
|
|
/* Now we can free the handler object */ |
|
|
|
ACPI_FREE(handler); |
|
return_ACPI_STATUS(status); |
|
|
|
unlock_and_exit: |
|
acpi_os_release_lock(acpi_gbl_gpe_lock, flags); |
|
|
|
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); |
|
return_ACPI_STATUS(status); |
|
} |
|
|
|
ACPI_EXPORT_SYMBOL(acpi_remove_gpe_handler) |
|
|
|
/******************************************************************************* |
|
* |
|
* FUNCTION: acpi_acquire_global_lock |
|
* |
|
* PARAMETERS: timeout - How long the caller is willing to wait |
|
* handle - Where the handle to the lock is returned |
|
* (if acquired) |
|
* |
|
* RETURN: Status |
|
* |
|
* DESCRIPTION: Acquire the ACPI Global Lock |
|
* |
|
* Note: Allows callers with the same thread ID to acquire the global lock |
|
* multiple times. In other words, externally, the behavior of the global lock |
|
* is identical to an AML mutex. On the first acquire, a new handle is |
|
* returned. On any subsequent calls to acquire by the same thread, the same |
|
* handle is returned. |
|
* |
|
******************************************************************************/ |
|
acpi_status acpi_acquire_global_lock(u16 timeout, u32 *handle) |
|
{ |
|
acpi_status status; |
|
|
|
if (!handle) { |
|
return (AE_BAD_PARAMETER); |
|
} |
|
|
|
/* Must lock interpreter to prevent race conditions */ |
|
|
|
acpi_ex_enter_interpreter(); |
|
|
|
status = acpi_ex_acquire_mutex_object(timeout, |
|
acpi_gbl_global_lock_mutex, |
|
acpi_os_get_thread_id()); |
|
|
|
if (ACPI_SUCCESS(status)) { |
|
|
|
/* Return the global lock handle (updated in acpi_ev_acquire_global_lock) */ |
|
|
|
*handle = acpi_gbl_global_lock_handle; |
|
} |
|
|
|
acpi_ex_exit_interpreter(); |
|
return (status); |
|
} |
|
|
|
ACPI_EXPORT_SYMBOL(acpi_acquire_global_lock) |
|
|
|
/******************************************************************************* |
|
* |
|
* FUNCTION: acpi_release_global_lock |
|
* |
|
* PARAMETERS: handle - Returned from acpi_acquire_global_lock |
|
* |
|
* RETURN: Status |
|
* |
|
* DESCRIPTION: Release the ACPI Global Lock. The handle must be valid. |
|
* |
|
******************************************************************************/ |
|
acpi_status acpi_release_global_lock(u32 handle) |
|
{ |
|
acpi_status status; |
|
|
|
if (!handle || (handle != acpi_gbl_global_lock_handle)) { |
|
return (AE_NOT_ACQUIRED); |
|
} |
|
|
|
status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex); |
|
return (status); |
|
} |
|
|
|
ACPI_EXPORT_SYMBOL(acpi_release_global_lock) |
|
#endif /* !ACPI_REDUCED_HARDWARE */
|
|
|