/****************************************************************************** * * Module Name: evxface - External interfaces for ACPI events * *****************************************************************************/ /* * Copyright (C) 2000 - 2016, 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. */ #define EXPORT_ACPI_INTERFACES #include <acpi/acpi.h> #include "accommon.h" #include "acnamesp.h" #include "acevents.h" #include "acinterp.h" #define _COMPONENT ACPI_EVENTS ACPI_MODULE_NAME("evxface") #if (!ACPI_REDUCED_HARDWARE) /* Local prototypes */ 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); #endif /******************************************************************************* * * FUNCTION: acpi_install_notify_handler * * PARAMETERS: device - The device for which notifies will be handled * 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 * context - Value passed to the handler on each GPE * * RETURN: Status * * DESCRIPTION: Install a handler for notifications on an ACPI Device, * thermal_zone, or Processor object. * * NOTES: The Root namespace object may have only one handler for each * type of notify (System/Device). Device/Thermal/Processor objects * may have one device notify handler, and multiple system notify * handlers. * ******************************************************************************/ acpi_status acpi_install_notify_handler(acpi_handle device, u32 handler_type, acpi_notify_handler handler, void *context) { 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; acpi_status status; u32 i; ACPI_FUNCTION_TRACE(acpi_install_notify_handler); /* Parameter validation */ if ((!device) || (!handler) || (!handler_type) || (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) { return_ACPI_STATUS(AE_BAD_PARAMETER); } status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* * Root Object: * Registering a notify handler on the root object indicates that the * caller wishes to receive notifications for all objects. Note that * only one global handler can be registered per notify type. * Ensure that a handler is not already installed. */ if (device == ACPI_ROOT_OBJECT) { for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) { if (handler_type & (i + 1)) { if (acpi_gbl_global_notify[i].handler) { status = AE_ALREADY_EXISTS; goto unlock_and_exit; } acpi_gbl_global_notify[i].handler = handler; acpi_gbl_global_notify[i].context = context; } } goto unlock_and_exit; /* Global notify handler installed, all done */ } /* * All Other Objects: * Caller will only receive notifications specific to the target * object. Note that only certain object types are allowed to * receive notifications. */ /* Are Notifies allowed on this object? */ if (!acpi_ev_is_notify_object(node)) { status = AE_TYPE; goto unlock_and_exit; } /* Check for an existing internal object, might not exist */ obj_desc = acpi_ns_get_attached_object(node); if (!obj_desc) { /* Create a new object */ obj_desc = acpi_ut_create_internal_object(node->type); if (!obj_desc) { status = AE_NO_MEMORY; goto unlock_and_exit; } /* Attach new object to the Node, remove local reference */ status = acpi_ns_attach_object(device, obj_desc, node->type); acpi_ut_remove_reference(obj_desc); if (ACPI_FAILURE(status)) { goto unlock_and_exit; } } /* Ensure that the handler is not already installed in the lists */ for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) { if (handler_type & (i + 1)) { handler_obj = obj_desc->common_notify.notify_list[i]; while (handler_obj) { if (handler_obj->notify.handler == handler) { status = AE_ALREADY_EXISTS; goto unlock_and_exit; } handler_obj = handler_obj->notify.next[i]; } } } /* Create and populate a new notify handler object */ handler_obj = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_NOTIFY); if (!handler_obj) { status = AE_NO_MEMORY; goto unlock_and_exit; } handler_obj->notify.node = node; handler_obj->notify.handler_type = handler_type; handler_obj->notify.handler = handler; handler_obj->notify.context = context; /* Install the handler at the list head(s) */ for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) { if (handler_type & (i + 1)) { handler_obj->notify.next[i] = obj_desc->common_notify.notify_list[i]; obj_desc->common_notify.notify_list[i] = handler_obj; } } /* Add an extra reference if handler was installed in both lists */ if (handler_type == ACPI_ALL_NOTIFY) { acpi_ut_add_reference(handler_obj); } unlock_and_exit: (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL(acpi_install_notify_handler) /******************************************************************************* * * FUNCTION: acpi_remove_notify_handler * * PARAMETERS: device - The device for which the handler is installed * 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; ACPI_FUNCTION_TRACE(acpi_remove_notify_handler); /* Parameter validation */ if ((!device) || (!handler) || (!handler_type) || (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) { return_ACPI_STATUS(AE_BAD_PARAMETER); } /* Root Object. Global handlers are removed here */ if (device == ACPI_ROOT_OBJECT) { for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) { if (handler_type & (i + 1)) { status = 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; } ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Removing global notify handler\n")); acpi_gbl_global_notify[i].handler = NULL; acpi_gbl_global_notify[i].context = NULL; (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); /* Make sure all deferred notify tasks are completed */ acpi_os_wait_events_complete(); } } return_ACPI_STATUS(AE_OK); } /* All other objects: Are Notifies allowed on this object? */ if (!acpi_ev_is_notify_object(node)) { return_ACPI_STATUS(AE_TYPE); } /* Must have an existing internal object */ obj_desc = acpi_ns_get_attached_object(node); if (!obj_desc) { return_ACPI_STATUS(AE_NOT_EXIST); } /* Internal object exists. Find the handler and remove it */ for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) { if (handler_type & (i + 1)) { status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } handler_obj = obj_desc->common_notify.notify_list[i]; previous_handler_obj = NULL; /* Attempt to find the handler in the handler list */ while (handler_obj && (handler_obj->notify.handler != handler)) { previous_handler_obj = handler_obj; handler_obj = handler_obj->notify.next[i]; } if (!handler_obj) { status = AE_NOT_EXIST; goto unlock_and_exit; } /* Remove the handler object from the list */ if (previous_handler_obj) { /* Handler is not at the list head */ previous_handler_obj->notify.next[i] = handler_obj->notify.next[i]; } else { /* Handler is at the list head */ obj_desc->common_notify.notify_list[i] = handler_obj->notify.next[i]; } (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); /* Make sure all deferred notify tasks are completed */ acpi_os_wait_events_complete(); acpi_ut_remove_reference(handler_obj); } } return_ACPI_STATUS(status); unlock_and_exit: (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL(acpi_remove_notify_handler) /******************************************************************************* * * FUNCTION: acpi_install_exception_handler * * PARAMETERS: handler - Pointer to the handler function for the * event * * RETURN: Status * * DESCRIPTION: Saves the pointer to the handler function * ******************************************************************************/ #ifdef ACPI_FUTURE_USAGE acpi_status acpi_install_exception_handler(acpi_exception_handler handler) { acpi_status status; ACPI_FUNCTION_TRACE(acpi_install_exception_handler); 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 #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); } 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 */