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/******************************************************************************
*
* Module Name: evxface - External interfaces for ACPI events
* $Revision: 116 $
*
*****************************************************************************/
/*
* Copyright (C) 2000, 2001 R. Byron Moore
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "acpi.h"
#include "achware.h"
#include "acnamesp.h"
#include "acevents.h"
#include "amlcode.h"
#include "acinterp.h"
#define _COMPONENT ACPI_EVENTS
MODULE_NAME ("evxface")
/*******************************************************************************
*
* 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;
FUNCTION_TRACE ("Acpi_install_fixed_event_handler");
/* Parameter validation */
if (event > ACPI_EVENT_MAX) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
/* Don't allow two handlers. */
if (NULL != acpi_gbl_fixed_event_handlers[event].handler) {
status = AE_EXIST;
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_enable_event (event, ACPI_EVENT_FIXED, 0);
if (!ACPI_SUCCESS (status)) {
ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "Could not enable fixed event.\n"));
/* 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 %X, Handler=%p\n", event, handler));
}
cleanup:
acpi_ut_release_mutex (ACPI_MTX_EVENTS);
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* 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;
FUNCTION_TRACE ("Acpi_remove_fixed_event_handler");
/* Parameter validation */
if (event > ACPI_EVENT_MAX) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
/* Disable the event before removing the handler */
status = acpi_disable_event(event, ACPI_EVENT_FIXED, 0);
/* Always Remove the handler */
acpi_gbl_fixed_event_handlers[event].handler = NULL;
acpi_gbl_fixed_event_handlers[event].context = NULL;
if (!ACPI_SUCCESS (status)) {
ACPI_DEBUG_PRINT ((ACPI_DB_WARN,
"Could not write to fixed event enable register.\n"));
}
else {
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Disabled fixed event %X.\n", event));
}
acpi_ut_release_mutex (ACPI_MTX_EVENTS);
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* 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: Driver_handler (80-ff)
* Handler - Address of the handler
* Context - Value passed to the handler on each GPE
*
* RETURN: Status
*
* DESCRIPTION: Install a handler for notifies on an ACPI device
*
******************************************************************************/
acpi_status
acpi_install_notify_handler (
acpi_handle device,
u32 handler_type,
acpi_notify_handler handler,
void *context)
{
acpi_operand_object *obj_desc;
acpi_operand_object *notify_obj;
acpi_namespace_node *device_node;
acpi_status status = AE_OK;
FUNCTION_TRACE ("Acpi_install_notify_handler");
/* Parameter validation */
if ((!handler) ||
(handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
/* Convert and validate the device handle */
device_node = acpi_ns_map_handle_to_node (device);
if (!device_node) {
status = AE_BAD_PARAMETER;
goto unlock_and_exit;
}
/*
* 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 <external> global handler can be regsitered (per notify type).
*/
if (device == ACPI_ROOT_OBJECT) {
/* Make sure the handler is not already installed */
if (((handler_type == ACPI_SYSTEM_NOTIFY) &&
acpi_gbl_sys_notify.handler) ||
((handler_type == ACPI_DEVICE_NOTIFY) &&
acpi_gbl_drv_notify.handler)) {
status = AE_EXIST;
goto unlock_and_exit;
}
if (handler_type == ACPI_SYSTEM_NOTIFY) {
acpi_gbl_sys_notify.node = device_node;
acpi_gbl_sys_notify.handler = handler;
acpi_gbl_sys_notify.context = context;
}
else /* ACPI_DEVICE_NOTIFY */ {
acpi_gbl_drv_notify.node = device_node;
acpi_gbl_drv_notify.handler = handler;
acpi_gbl_drv_notify.context = context;
}
/* Global notify handler installed */
}
/*
* All Other Objects:
* Caller will only receive notifications specific to the target object.
* Note that only certain object types can receive notifications.
*/
else {
/*
* These are the ONLY objects that can receive ACPI notifications
*/
if ((device_node->type != ACPI_TYPE_DEVICE) &&
(device_node->type != ACPI_TYPE_PROCESSOR) &&
(device_node->type != ACPI_TYPE_POWER) &&
(device_node->type != ACPI_TYPE_THERMAL)) {
status = AE_BAD_PARAMETER;
goto unlock_and_exit;
}
/* Check for an existing internal object */
obj_desc = acpi_ns_get_attached_object (device_node);
if (obj_desc) {
/* Object exists - make sure there's no handler */
if (((handler_type == ACPI_SYSTEM_NOTIFY) &&
obj_desc->device.sys_handler) ||
((handler_type == ACPI_DEVICE_NOTIFY) &&
obj_desc->device.drv_handler)) {
status = AE_EXIST;
goto unlock_and_exit;
}
}
else {
/* Create a new object */
obj_desc = acpi_ut_create_internal_object (device_node->type);
if (!obj_desc) {
status = AE_NO_MEMORY;
goto unlock_and_exit;
}
/* Attach new object to the Node */
status = acpi_ns_attach_object (device, obj_desc, (u8) device_node->type);
if (ACPI_FAILURE (status)) {
goto unlock_and_exit;
}
}
/* Install the handler */
notify_obj = acpi_ut_create_internal_object (INTERNAL_TYPE_NOTIFY);
if (!notify_obj) {
status = AE_NO_MEMORY;
goto unlock_and_exit;
}
notify_obj->notify_handler.node = device_node;
notify_obj->notify_handler.handler = handler;
notify_obj->notify_handler.context = context;
if (handler_type == ACPI_SYSTEM_NOTIFY) {
obj_desc->device.sys_handler = notify_obj;
}
else /* ACPI_DEVICE_NOTIFY */ {
obj_desc->device.drv_handler = notify_obj;
}
}
unlock_and_exit:
acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_remove_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: Driver_handler (80-ff)
* 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)
{
acpi_operand_object *notify_obj;
acpi_operand_object *obj_desc;
acpi_namespace_node *device_node;
acpi_status status = AE_OK;
FUNCTION_TRACE ("Acpi_remove_notify_handler");
/* Parameter validation */
if ((!handler) ||
(handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
/* Convert and validate the device handle */
device_node = acpi_ns_map_handle_to_node (device);
if (!device_node) {
status = AE_BAD_PARAMETER;
goto unlock_and_exit;
}
/*
* Root Object
*/
if (device == ACPI_ROOT_OBJECT) {
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Removing notify handler for ROOT object.\n"));
if (((handler_type == ACPI_SYSTEM_NOTIFY) &&
!acpi_gbl_sys_notify.handler) ||
((handler_type == ACPI_DEVICE_NOTIFY) &&
!acpi_gbl_drv_notify.handler)) {
status = AE_NOT_EXIST;
goto unlock_and_exit;
}
if (handler_type == ACPI_SYSTEM_NOTIFY) {
acpi_gbl_sys_notify.node = NULL;
acpi_gbl_sys_notify.handler = NULL;
acpi_gbl_sys_notify.context = NULL;
}
else {
acpi_gbl_drv_notify.node = NULL;
acpi_gbl_drv_notify.handler = NULL;
acpi_gbl_drv_notify.context = NULL;
}
}
/*
* All Other Objects
*/
else {
/*
* These are the ONLY objects that can receive ACPI notifications
*/
if ((device_node->type != ACPI_TYPE_DEVICE) &&
(device_node->type != ACPI_TYPE_PROCESSOR) &&
(device_node->type != ACPI_TYPE_POWER) &&
(device_node->type != ACPI_TYPE_THERMAL)) {
status = AE_BAD_PARAMETER;
goto unlock_and_exit;
}
/* Check for an existing internal object */
obj_desc = acpi_ns_get_attached_object (device_node);
if (!obj_desc) {
status = AE_NOT_EXIST;
goto unlock_and_exit;
}
/* Object exists - make sure there's an existing handler */
if (handler_type == ACPI_SYSTEM_NOTIFY) {
notify_obj = obj_desc->device.sys_handler;
}
else {
notify_obj = obj_desc->device.drv_handler;
}
if ((!notify_obj) ||
(notify_obj->notify_handler.handler != handler)) {
status = AE_BAD_PARAMETER;
goto unlock_and_exit;
}
/* Remove the handler */
if (handler_type == ACPI_SYSTEM_NOTIFY) {
obj_desc->device.sys_handler = NULL;
}
else {
obj_desc->device.drv_handler = NULL;
}
acpi_ut_remove_reference (notify_obj);
}
unlock_and_exit:
acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_install_gpe_handler
*
* PARAMETERS: Gpe_number - The GPE number. The numbering scheme is
* bank 0 first, then bank 1.
* Type - Whether this GPE should be treated as an
* edge- or level-triggered interrupt.
* Handler - 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 (
u32 gpe_number,
u32 type,
acpi_gpe_handler handler,
void *context)
{
acpi_status status = AE_OK;
FUNCTION_TRACE ("Acpi_install_gpe_handler");
/* Parameter validation */
if (!handler || (gpe_number > ACPI_GPE_MAX)) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Ensure that we have a valid GPE number */
if (acpi_gbl_gpe_valid[gpe_number] == ACPI_GPE_INVALID) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
/* Make sure that there isn't a handler there already */
if (acpi_gbl_gpe_info[gpe_number].handler) {
status = AE_EXIST;
goto cleanup;
}
/* Install the handler */
acpi_gbl_gpe_info[gpe_number].handler = handler;
acpi_gbl_gpe_info[gpe_number].context = context;
acpi_gbl_gpe_info[gpe_number].type = (u8) type;
/* Clear the GPE (of stale events), the enable it */
acpi_hw_clear_gpe (gpe_number);
acpi_hw_enable_gpe (gpe_number);
cleanup:
acpi_ut_release_mutex (ACPI_MTX_EVENTS);
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_remove_gpe_handler
*
* PARAMETERS: Gpe_number - The event to remove a handler
* Handler - Address of the handler
*
* RETURN: Status
*
* DESCRIPTION: Remove a handler for a General Purpose Acpi_event.
*
******************************************************************************/
acpi_status
acpi_remove_gpe_handler (
u32 gpe_number,
acpi_gpe_handler handler)
{
acpi_status status = AE_OK;
FUNCTION_TRACE ("Acpi_remove_gpe_handler");
/* Parameter validation */
if (!handler || (gpe_number > ACPI_GPE_MAX)) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Ensure that we have a valid GPE number */
if (acpi_gbl_gpe_valid[gpe_number] == ACPI_GPE_INVALID) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Disable the GPE before removing the handler */
acpi_hw_disable_gpe (gpe_number);
acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
/* Make sure that the installed handler is the same */
if (acpi_gbl_gpe_info[gpe_number].handler != handler) {
acpi_hw_enable_gpe (gpe_number);
status = AE_BAD_PARAMETER;
goto cleanup;
}
/* Remove the handler */
acpi_gbl_gpe_info[gpe_number].handler = NULL;
acpi_gbl_gpe_info[gpe_number].context = NULL;
cleanup:
acpi_ut_release_mutex (ACPI_MTX_EVENTS);
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_acquire_global_lock
*
* PARAMETERS: Timeout - How long the caller is willing to wait
* Out_handle - A handle to the lock if acquired
*
* RETURN: Status
*
* DESCRIPTION: Acquire the ACPI Global Lock
*
******************************************************************************/
acpi_status
acpi_acquire_global_lock (
void)
{
acpi_status status;
status = acpi_ex_enter_interpreter ();
if (ACPI_FAILURE (status)) {
return (status);
}
/*
* TBD: [Restructure] add timeout param to internal interface, and
* perhaps INTERPRETER_LOCKED
*/
status = acpi_ev_acquire_global_lock ();
acpi_ex_exit_interpreter ();
return (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_release_global_lock
*
* PARAMETERS: Handle - Returned from Acpi_acquire_global_lock
*
* RETURN: Status
*
* DESCRIPTION: Release the ACPI Global Lock
*
******************************************************************************/
acpi_status
acpi_release_global_lock (
void)
{
acpi_ev_release_global_lock ();
return (AE_OK);
}
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