diff options
Diffstat (limited to 'drivers/acpi/acpica/evxface.c')
| -rw-r--r-- | drivers/acpi/acpica/evxface.c | 1079 |
1 files changed, 1079 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/evxface.c b/drivers/acpi/acpica/evxface.c new file mode 100644 index 000000000..841557bda --- /dev/null +++ b/drivers/acpi/acpica/evxface.c @@ -0,0 +1,1079 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 +/****************************************************************************** + * + * Module Name: evxface - External interfaces for ACPI events + * + * Copyright (C) 2000 - 2018, Intel Corp. + * + *****************************************************************************/ + +#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, 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 */ |