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/******************************************************************************
*
* Module Name: evmisc - ACPI device notification handler dispatch
* and ACPI Global Lock support
* $Revision: 35 $
*
*****************************************************************************/
/*
* 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 "acevents.h"
#include "acnamesp.h"
#include "acinterp.h"
#include "achware.h"
#define _COMPONENT ACPI_EVENTS
MODULE_NAME ("evmisc")
/*******************************************************************************
*
* FUNCTION: Acpi_ev_queue_notify_request
*
* PARAMETERS:
*
* RETURN: None.
*
* DESCRIPTION: Dispatch a device notification event to a previously
* installed handler.
*
******************************************************************************/
acpi_status
acpi_ev_queue_notify_request (
acpi_namespace_node *node,
u32 notify_value)
{
acpi_operand_object *obj_desc;
acpi_operand_object *handler_obj = NULL;
acpi_generic_state *notify_info;
acpi_status status = AE_OK;
PROC_NAME ("Ev_queue_notify_request");
/*
* For value 1 (Ejection Request), some device method may need to be run.
* For value 2 (Device Wake) if _PRW exists, the _PS0 method may need to be run.
* For value 0x80 (Status Change) on the power button or sleep button,
* initiate soft-off or sleep operation?
*/
ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
"Dispatching Notify(%X) on node %p\n", notify_value, node));
switch (notify_value) {
case 0:
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Notify value: Re-enumerate Devices\n"));
break;
case 1:
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Notify value: Ejection Request\n"));
break;
case 2:
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Notify value: Device Wake\n"));
break;
case 0x80:
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Notify value: Status Change\n"));
break;
default:
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Unknown Notify Value: %X \n", notify_value));
break;
}
/*
* Get the notify object attached to the device Node
*/
obj_desc = acpi_ns_get_attached_object (node);
if (obj_desc) {
/* We have the notify object, Get the right handler */
switch (node->type) {
case ACPI_TYPE_DEVICE:
if (notify_value <= MAX_SYS_NOTIFY) {
handler_obj = obj_desc->device.sys_handler;
}
else {
handler_obj = obj_desc->device.drv_handler;
}
break;
case ACPI_TYPE_THERMAL:
if (notify_value <= MAX_SYS_NOTIFY) {
handler_obj = obj_desc->thermal_zone.sys_handler;
}
else {
handler_obj = obj_desc->thermal_zone.drv_handler;
}
break;
}
}
/* If there is any handler to run, schedule the dispatcher */
if ((acpi_gbl_sys_notify.handler && (notify_value <= MAX_SYS_NOTIFY)) ||
(acpi_gbl_drv_notify.handler && (notify_value > MAX_SYS_NOTIFY)) ||
handler_obj) {
notify_info = acpi_ut_create_generic_state ();
if (!notify_info) {
return (AE_NO_MEMORY);
}
notify_info->common.data_type = ACPI_DESC_TYPE_STATE_NOTIFY;
notify_info->notify.node = node;
notify_info->notify.value = (u16) notify_value;
notify_info->notify.handler_obj = handler_obj;
status = acpi_os_queue_for_execution (OSD_PRIORITY_HIGH,
acpi_ev_notify_dispatch, notify_info);
if (ACPI_FAILURE (status)) {
acpi_ut_delete_generic_state (notify_info);
}
}
if (!handler_obj) {
/* There is no per-device notify handler for this device */
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "No notify handler for node %p \n", node));
}
return (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_ev_notify_dispatch
*
* PARAMETERS:
*
* RETURN: None.
*
* DESCRIPTION: Dispatch a device notification event to a previously
* installed handler.
*
******************************************************************************/
void
acpi_ev_notify_dispatch (
void *context)
{
acpi_generic_state *notify_info = (acpi_generic_state *) context;
acpi_notify_handler global_handler = NULL;
void *global_context = NULL;
acpi_operand_object *handler_obj;
FUNCTION_ENTRY ();
/*
* We will invoke a global notify handler if installed.
* This is done _before_ we invoke the per-device handler attached to the device.
*/
if (notify_info->notify.value <= MAX_SYS_NOTIFY) {
/* Global system notification handler */
if (acpi_gbl_sys_notify.handler) {
global_handler = acpi_gbl_sys_notify.handler;
global_context = acpi_gbl_sys_notify.context;
}
}
else {
/* Global driver notification handler */
if (acpi_gbl_drv_notify.handler) {
global_handler = acpi_gbl_drv_notify.handler;
global_context = acpi_gbl_drv_notify.context;
}
}
/* Invoke the system handler first, if present */
if (global_handler) {
global_handler (notify_info->notify.node, notify_info->notify.value, global_context);
}
/* Now invoke the per-device handler, if present */
handler_obj = notify_info->notify.handler_obj;
if (handler_obj) {
handler_obj->notify_handler.handler (notify_info->notify.node, notify_info->notify.value,
handler_obj->notify_handler.context);
}
/* All done with the info object */
acpi_ut_delete_generic_state (notify_info);
}
/*******************************************************************************
*
* FUNCTION: Acpi_ev_global_lock_thread
*
* RETURN: None
*
* DESCRIPTION: Invoked by SCI interrupt handler upon acquisition of the
* Global Lock. Simply signal all threads that are waiting
* for the lock.
*
******************************************************************************/
static void
acpi_ev_global_lock_thread (
void *context)
{
/* Signal threads that are waiting for the lock */
if (acpi_gbl_global_lock_thread_count) {
/* Send sufficient units to the semaphore */
acpi_os_signal_semaphore (acpi_gbl_global_lock_semaphore,
acpi_gbl_global_lock_thread_count);
}
}
/*******************************************************************************
*
* FUNCTION: Acpi_ev_global_lock_handler
*
* RETURN: Status
*
* DESCRIPTION: Invoked directly from the SCI handler when a global lock
* release interrupt occurs. Grab the global lock and queue
* the global lock thread for execution
*
******************************************************************************/
static u32
acpi_ev_global_lock_handler (
void *context)
{
u8 acquired = FALSE;
void *global_lock;
/*
* Attempt to get the lock
* If we don't get it now, it will be marked pending and we will
* take another interrupt when it becomes free.
*/
global_lock = acpi_gbl_FACS->global_lock;
ACPI_ACQUIRE_GLOBAL_LOCK (global_lock, acquired);
if (acquired) {
/* Got the lock, now wake all threads waiting for it */
acpi_gbl_global_lock_acquired = TRUE;
/* Run the Global Lock thread which will signal all waiting threads */
acpi_os_queue_for_execution (OSD_PRIORITY_HIGH, acpi_ev_global_lock_thread,
context);
}
return (INTERRUPT_HANDLED);
}
/*******************************************************************************
*
* FUNCTION: Acpi_ev_init_global_lock_handler
*
* RETURN: Status
*
* DESCRIPTION: Install a handler for the global lock release event
*
******************************************************************************/
acpi_status
acpi_ev_init_global_lock_handler (void)
{
acpi_status status;
FUNCTION_TRACE ("Ev_init_global_lock_handler");
acpi_gbl_global_lock_present = TRUE;
status = acpi_install_fixed_event_handler (ACPI_EVENT_GLOBAL,
acpi_ev_global_lock_handler, NULL);
/*
* If the global lock does not exist on this platform, the attempt
* to enable GBL_STS will fail (the GBL_EN bit will not stick)
* Map to AE_OK, but mark global lock as not present.
* Any attempt to actually use the global lock will be flagged
* with an error.
*/
if (status == AE_NO_HARDWARE_RESPONSE) {
acpi_gbl_global_lock_present = FALSE;
status = AE_OK;
}
return_ACPI_STATUS (status);
}
/******************************************************************************
*
* FUNCTION: Acpi_ev_acquire_global_lock
*
* RETURN: Status
*
* DESCRIPTION: Attempt to gain ownership of the Global Lock.
*
*****************************************************************************/
acpi_status
acpi_ev_acquire_global_lock(void)
{
acpi_status status = AE_OK;
u8 acquired = FALSE;
void *global_lock;
FUNCTION_TRACE ("Ev_acquire_global_lock");
/* Make sure that we actually have a global lock */
if (!acpi_gbl_global_lock_present) {
return_ACPI_STATUS (AE_NO_GLOBAL_LOCK);
}
/* One more thread wants the global lock */
acpi_gbl_global_lock_thread_count++;
/* If we (OS side) have the hardware lock already, we are done */
if (acpi_gbl_global_lock_acquired) {
return_ACPI_STATUS (AE_OK);
}
/* Only if the FACS is valid */
if (!acpi_gbl_FACS) {
return_ACPI_STATUS (AE_OK);
}
/* We must acquire the actual hardware lock */
global_lock = acpi_gbl_FACS->global_lock;
ACPI_ACQUIRE_GLOBAL_LOCK (global_lock, acquired);
if (acquired) {
/* We got the lock */
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Acquired the Global Lock\n"));
acpi_gbl_global_lock_acquired = TRUE;
return_ACPI_STATUS (AE_OK);
}
/*
* Did not get the lock. The pending bit was set above, and we must now
* wait until we get the global lock released interrupt.
*/
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Waiting for the HW Global Lock\n"));
/*
* Acquire the global lock semaphore first.
* Since this wait will block, we must release the interpreter
*/
status = acpi_ex_system_wait_semaphore (acpi_gbl_global_lock_semaphore,
ACPI_UINT32_MAX);
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_ev_release_global_lock
*
* DESCRIPTION: Releases ownership of the Global Lock.
*
******************************************************************************/
void
acpi_ev_release_global_lock (void)
{
u8 pending = FALSE;
void *global_lock;
FUNCTION_TRACE ("Ev_release_global_lock");
if (!acpi_gbl_global_lock_thread_count) {
REPORT_WARNING(("Global Lock has not be acquired, cannot release\n"));
return_VOID;
}
/* One fewer thread has the global lock */
acpi_gbl_global_lock_thread_count--;
/* Have all threads released the lock? */
if (!acpi_gbl_global_lock_thread_count) {
/*
* No more threads holding lock, we can do the actual hardware
* release
*/
global_lock = acpi_gbl_FACS->global_lock;
ACPI_RELEASE_GLOBAL_LOCK (global_lock, pending);
acpi_gbl_global_lock_acquired = FALSE;
/*
* If the pending bit was set, we must write GBL_RLS to the control
* register
*/
if (pending) {
acpi_hw_register_bit_access (ACPI_WRITE, ACPI_MTX_LOCK,
GBL_RLS, 1);
}
}
return_VOID;
}
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