[deliverable/linux.git] / drivers / acpi / events / evmisc.c

/******************************************************************************
 *
 * Module Name: evmisc - Miscellaneous event manager support functions
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2005, R. Byron Moore
 * 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.
 */

#include <acpi/acpi.h>
#include <acpi/acevents.h>
#include <acpi/acnamesp.h>
#include <acpi/acinterp.h>

#define _COMPONENT          ACPI_EVENTS
	 ACPI_MODULE_NAME    ("evmisc")


#ifdef ACPI_DEBUG_OUTPUT
static const char                *acpi_notify_value_names[] =
{
	"Bus Check",
	"Device Check",
	"Device Wake",
	"Eject request",
	"Device Check Light",
	"Frequency Mismatch",
	"Bus Mode Mismatch",
	"Power Fault"
};
#endif

/* Local prototypes */

static void ACPI_SYSTEM_XFACE
acpi_ev_notify_dispatch (
	void                            *context);

static void ACPI_SYSTEM_XFACE
acpi_ev_global_lock_thread (
	void                            *context);

static u32
acpi_ev_global_lock_handler (
	void                            *context);


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_is_notify_object
 *
 * PARAMETERS:  Node            - Node to check
 *
 * RETURN:      TRUE if notifies allowed on this object
 *
 * DESCRIPTION: Check type of node for a object that supports notifies.
 *
 *              TBD: This could be replaced by a flag bit in the node.
 *
 ******************************************************************************/

u8
acpi_ev_is_notify_object (
	struct acpi_namespace_node      *node)
{
	switch (node->type) {
	case ACPI_TYPE_DEVICE:
	case ACPI_TYPE_PROCESSOR:
	case ACPI_TYPE_POWER:
	case ACPI_TYPE_THERMAL:
		/*
		 * These are the ONLY objects that can receive ACPI notifications
		 */
		return (TRUE);

	default:
		return (FALSE);
	}
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_queue_notify_request
 *
 * PARAMETERS:  Node            - NS node for the notified object
 *              notify_value    - Value from the Notify() request
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Dispatch a device notification event to a previously
 *              installed handler.
 *
 ******************************************************************************/

acpi_status
acpi_ev_queue_notify_request (
	struct acpi_namespace_node      *node,
	u32                             notify_value)
{
	union acpi_operand_object       *obj_desc;
	union acpi_operand_object       *handler_obj = NULL;
	union acpi_generic_state        *notify_info;
	acpi_status                     status = AE_OK;


	ACPI_FUNCTION_NAME ("ev_queue_notify_request");


	/*
	 * For value 3 (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));

	if (notify_value <= 7) {
		ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Notify value: %s\n",
				acpi_notify_value_names[notify_value]));
	}
	else {
		ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
			"Notify value: 0x%2.2X **Device Specific**\n",
			notify_value));
	}

	/* Get the notify object attached to the NS 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:
		case ACPI_TYPE_THERMAL:
		case ACPI_TYPE_PROCESSOR:
		case ACPI_TYPE_POWER:

			if (notify_value <= ACPI_MAX_SYS_NOTIFY) {
				handler_obj = obj_desc->common_notify.system_notify;
			}
			else {
				handler_obj = obj_desc->common_notify.device_notify;
			}
			break;

		default:
			/* All other types are not supported */
			return (AE_TYPE);
		}
	}

	/* If there is any handler to run, schedule the dispatcher */

	if ((acpi_gbl_system_notify.handler && (notify_value <= ACPI_MAX_SYS_NOTIFY)) ||
		(acpi_gbl_device_notify.handler && (notify_value > ACPI_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.
		 * This may or may not be a problem.
		 */
		ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
			"No notify handler for Notify(%4.4s, %X) node %p\n",
			acpi_ut_get_node_name (node), notify_value, node));
	}

	return (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_notify_dispatch
 *
 * PARAMETERS:  Context         - To be passed to the notify handler
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Dispatch a device notification event to a previously
 *              installed handler.
 *
 ******************************************************************************/

static void ACPI_SYSTEM_XFACE
acpi_ev_notify_dispatch (
	void                            *context)
{
	union acpi_generic_state        *notify_info = (union acpi_generic_state *) context;
	acpi_notify_handler             global_handler = NULL;
	void                            *global_context = NULL;
	union acpi_operand_object       *handler_obj;


	ACPI_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 <= ACPI_MAX_SYS_NOTIFY) {
		/* Global system notification handler */

		if (acpi_gbl_system_notify.handler) {
			global_handler = acpi_gbl_system_notify.handler;
			global_context = acpi_gbl_system_notify.context;
		}
	}
	else {
		/* Global driver notification handler */

		if (acpi_gbl_device_notify.handler) {
			global_handler = acpi_gbl_device_notify.handler;
			global_context = acpi_gbl_device_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 (notify_info->notify.node,
			notify_info->notify.value,
			handler_obj->notify.context);
	}

	/* All done with the info object */

	acpi_ut_delete_generic_state (notify_info);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_global_lock_thread
 *
 * PARAMETERS:  Context         - From thread interface, not used
 *
 * 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_SYSTEM_XFACE
acpi_ev_global_lock_thread (
	void                            *context)
{
	acpi_status                     status;


	/* Signal threads that are waiting for the lock */

	if (acpi_gbl_global_lock_thread_count) {
		/* Send sufficient units to the semaphore */

		status = acpi_os_signal_semaphore (acpi_gbl_global_lock_semaphore,
				 acpi_gbl_global_lock_thread_count);
		if (ACPI_FAILURE (status)) {
			ACPI_REPORT_ERROR (("Could not signal Global Lock semaphore\n"));
		}
	}
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_global_lock_handler
 *
 * PARAMETERS:  Context         - From thread interface, not used
 *
 * RETURN:      ACPI_INTERRUPT_HANDLED or ACPI_INTERRUPT_NOT_HANDLED
 *
 * 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;
	acpi_status                     status;


	/*
	 * 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.
	 */
	ACPI_ACQUIRE_GLOBAL_LOCK (acpi_gbl_common_fACS.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 */

		status = acpi_os_queue_for_execution (OSD_PRIORITY_HIGH,
				  acpi_ev_global_lock_thread, context);
		if (ACPI_FAILURE (status)) {
			ACPI_REPORT_ERROR (("Could not queue Global Lock thread, %s\n",
				acpi_format_exception (status)));

			return (ACPI_INTERRUPT_NOT_HANDLED);
		}
	}

	return (ACPI_INTERRUPT_HANDLED);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_init_global_lock_handler
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Install a handler for the global lock release event
 *
 ******************************************************************************/

acpi_status
acpi_ev_init_global_lock_handler (
	void)
{
	acpi_status                     status;


	ACPI_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_STATUS will fail (the GBL_ENABLE 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_REPORT_ERROR ((
			"No response from Global Lock hardware, disabling lock\n"));

		acpi_gbl_global_lock_present = FALSE;
		status = AE_OK;
	}

	return_ACPI_STATUS (status);
}


/******************************************************************************
 *
 * FUNCTION:    acpi_ev_acquire_global_lock
 *
 * PARAMETERS:  Timeout         - Max time to wait for the lock, in millisec.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Attempt to gain ownership of the Global Lock.
 *
 *****************************************************************************/

acpi_status
acpi_ev_acquire_global_lock (
	u16                             timeout)
{
	acpi_status                     status = AE_OK;
	u8                              acquired = FALSE;


	ACPI_FUNCTION_TRACE ("ev_acquire_global_lock");


#ifndef ACPI_APPLICATION
	/* Make sure that we actually have a global lock */

	if (!acpi_gbl_global_lock_present) {
		return_ACPI_STATUS (AE_NO_GLOBAL_LOCK);
	}
#endif

	/* One more thread wants the global lock */

	acpi_gbl_global_lock_thread_count++;

	/*
	 * If we (OS side vs. BIOS side) have the hardware lock already,
	 * we are done
	 */
	if (acpi_gbl_global_lock_acquired) {
		return_ACPI_STATUS (AE_OK);
	}

	/* We must acquire the actual hardware lock */

	ACPI_ACQUIRE_GLOBAL_LOCK (acpi_gbl_common_fACS.global_lock, acquired);
	if (acquired) {
	   /* We got the lock */

		ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Acquired the HW 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_EXEC, "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,
			  timeout);
	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_release_global_lock
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Releases ownership of the Global Lock.
 *
 ******************************************************************************/

acpi_status
acpi_ev_release_global_lock (
	void)
{
	u8                              pending = FALSE;
	acpi_status                     status = AE_OK;


	ACPI_FUNCTION_TRACE ("ev_release_global_lock");


	if (!acpi_gbl_global_lock_thread_count) {
		ACPI_REPORT_WARNING((
			"Cannot release HW Global Lock, it has not been acquired\n"));
		return_ACPI_STATUS (AE_NOT_ACQUIRED);
	}

	/* One fewer thread has the global lock */

	acpi_gbl_global_lock_thread_count--;
	if (acpi_gbl_global_lock_thread_count) {
		/* There are still some threads holding the lock, cannot release */

		return_ACPI_STATUS (AE_OK);
	}

	/*
	 * No more threads holding lock, we can do the actual hardware
	 * release
	 */
	ACPI_RELEASE_GLOBAL_LOCK (acpi_gbl_common_fACS.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) {
		status = acpi_set_register (ACPI_BITREG_GLOBAL_LOCK_RELEASE,
				 1, ACPI_MTX_LOCK);
	}

	return_ACPI_STATUS (status);
}


/******************************************************************************
 *
 * FUNCTION:    acpi_ev_terminate
 *
 * PARAMETERS:  none
 *
 * RETURN:      none
 *
 * DESCRIPTION: Disable events and free memory allocated for table storage.
 *
 ******************************************************************************/

void
acpi_ev_terminate (
	void)
{
	acpi_native_uint                i;
	acpi_status                     status;


	ACPI_FUNCTION_TRACE ("ev_terminate");


	if (acpi_gbl_events_initialized) {
		/*
		 * Disable all event-related functionality.
		 * In all cases, on error, print a message but obviously we don't abort.
		 */

		/* Disable all fixed events */

		for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
			status = acpi_disable_event ((u32) i, 0);
			if (ACPI_FAILURE (status)) {
				ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
					"Could not disable fixed event %d\n", (u32) i));
			}
		}

		/* Disable all GPEs in all GPE blocks */

		status = acpi_ev_walk_gpe_list (acpi_hw_disable_gpe_block);

		/* Remove SCI handler */

		status = acpi_ev_remove_sci_handler ();
		if (ACPI_FAILURE(status)) {
			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
				"Could not remove SCI handler\n"));
		}
	}

	/* Deallocate all handler objects installed within GPE info structs */

	status = acpi_ev_walk_gpe_list (acpi_ev_delete_gpe_handlers);

	/* Return to original mode if necessary */

	if (acpi_gbl_original_mode == ACPI_SYS_MODE_LEGACY) {
		status = acpi_disable ();
		if (ACPI_FAILURE (status)) {
			ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "acpi_disable failed\n"));
		}
	}
	return_VOID;
}
Commit	Line	Data
1da177e4 LT	1	/******************************************************************************
	2	*
	3	* Module Name: evmisc - Miscellaneous event manager support functions
	4	*
	5	*****************************************************************************/
	6
	7	/*
	8	* Copyright (C) 2000 - 2005, R. Byron Moore
	9	* All rights reserved.
	10	*
	11	* Redistribution and use in source and binary forms, with or without
	12	* modification, are permitted provided that the following conditions
	13	* are met:
	14	* 1. Redistributions of source code must retain the above copyright
	15	* notice, this list of conditions, and the following disclaimer,
	16	* without modification.
	17	* 2. Redistributions in binary form must reproduce at minimum a disclaimer
	18	* substantially similar to the "NO WARRANTY" disclaimer below
	19	* ("Disclaimer") and any redistribution must be conditioned upon
	20	* including a substantially similar Disclaimer requirement for further
	21	* binary redistribution.
	22	* 3. Neither the names of the above-listed copyright holders nor the names
	23	* of any contributors may be used to endorse or promote products derived
	24	* from this software without specific prior written permission.
	25	*
	26	* Alternatively, this software may be distributed under the terms of the
	27	* GNU General Public License ("GPL") version 2 as published by the Free
	28	* Software Foundation.
	29	*
	30	* NO WARRANTY
	31	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	32	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	33	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
	34	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	35	* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	36	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	37	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	38	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	39	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	40	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	41	* POSSIBILITY OF SUCH DAMAGES.
	42	*/
	43
	44	#include <acpi/acpi.h>
	45	#include <acpi/acevents.h>
	46	#include <acpi/acnamesp.h>
	47	#include <acpi/acinterp.h>
	48
	49	#define _COMPONENT ACPI_EVENTS
	50	ACPI_MODULE_NAME ("evmisc")
	51
	52
44f6c012 RM	53	#ifdef ACPI_DEBUG_OUTPUT
	54	static const char *acpi_notify_value_names[] =
	55	{
	56	"Bus Check",
	57	"Device Check",
	58	"Device Wake",
	59	"Eject request",
	60	"Device Check Light",
	61	"Frequency Mismatch",
	62	"Bus Mode Mismatch",
	63	"Power Fault"
	64	};
	65	#endif
	66
	67	/* Local prototypes */
	68
	69	static void ACPI_SYSTEM_XFACE
	70	acpi_ev_notify_dispatch (
	71	void *context);
	72
	73	static void ACPI_SYSTEM_XFACE
	74	acpi_ev_global_lock_thread (
	75	void *context);
	76
	77	static u32
	78	acpi_ev_global_lock_handler (
	79	void *context);
	80
	81
1da177e4 LT	82	/*******************************************************************************
	83	*
	84	* FUNCTION: acpi_ev_is_notify_object
	85	*
	86	* PARAMETERS: Node - Node to check
	87	*
	88	* RETURN: TRUE if notifies allowed on this object
	89	*
	90	* DESCRIPTION: Check type of node for a object that supports notifies.
	91	*
	92	* TBD: This could be replaced by a flag bit in the node.
	93	*
	94	******************************************************************************/
	95
	96	u8
	97	acpi_ev_is_notify_object (
	98	struct acpi_namespace_node *node)
	99	{
	100	switch (node->type) {
	101	case ACPI_TYPE_DEVICE:
	102	case ACPI_TYPE_PROCESSOR:
	103	case ACPI_TYPE_POWER:
	104	case ACPI_TYPE_THERMAL:
	105	/*
	106	* These are the ONLY objects that can receive ACPI notifications
	107	*/
	108	return (TRUE);
	109
	110	default:
	111	return (FALSE);
	112	}
	113	}
	114
	115
	116	/*******************************************************************************
	117	*
	118	* FUNCTION: acpi_ev_queue_notify_request
	119	*
	120	* PARAMETERS: Node - NS node for the notified object
	121	* notify_value - Value from the Notify() request
	122	*
	123	* RETURN: Status
	124	*
	125	* DESCRIPTION: Dispatch a device notification event to a previously
	126	* installed handler.
	127	*
	128	******************************************************************************/
	129
1da177e4 LT	130	acpi_status
	131	acpi_ev_queue_notify_request (
	132	struct acpi_namespace_node *node,
	133	u32 notify_value)
	134	{
	135	union acpi_operand_object *obj_desc;
	136	union acpi_operand_object *handler_obj = NULL;
	137	union acpi_generic_state *notify_info;
	138	acpi_status status = AE_OK;
	139
	140
	141	ACPI_FUNCTION_NAME ("ev_queue_notify_request");
	142
	143
	144	/*
	145	* For value 3 (Ejection Request), some device method may need to be run.
44f6c012 RM	146	* For value 2 (Device Wake) if _PRW exists, the _PS0 method may need
44f6c012 RM	147	* to be run.
1da177e4	148	* For value 0x80 (Status Change) on the power button or sleep button,
44f6c012	149	* initiate soft-off or sleep operation?
1da177e4 LT	150	*/
	151	ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
	152	"Dispatching Notify(%X) on node %p\n", notify_value, node));
	153
	154	if (notify_value <= 7) {
	155	ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Notify value: %s\n",
	156	acpi_notify_value_names[notify_value]));
	157	}
	158	else {
44f6c012 RM	159	ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
	160	"Notify value: 0x%2.2X Device Specific\n",
	161	notify_value));
1da177e4 LT	162	}
	163
	164	/* Get the notify object attached to the NS Node */
	165
	166	obj_desc = acpi_ns_get_attached_object (node);
	167	if (obj_desc) {
	168	/* We have the notify object, Get the right handler */
	169
	170	switch (node->type) {
	171	case ACPI_TYPE_DEVICE:
	172	case ACPI_TYPE_THERMAL:
	173	case ACPI_TYPE_PROCESSOR:
	174	case ACPI_TYPE_POWER:
	175
	176	if (notify_value <= ACPI_MAX_SYS_NOTIFY) {
	177	handler_obj = obj_desc->common_notify.system_notify;
	178	}
	179	else {
	180	handler_obj = obj_desc->common_notify.device_notify;
	181	}
	182	break;
	183
	184	default:
	185	/* All other types are not supported */
	186	return (AE_TYPE);
	187	}
	188	}
	189
	190	/* If there is any handler to run, schedule the dispatcher */
	191
	192	if ((acpi_gbl_system_notify.handler && (notify_value <= ACPI_MAX_SYS_NOTIFY)) \|\|
	193	(acpi_gbl_device_notify.handler && (notify_value > ACPI_MAX_SYS_NOTIFY)) \|\|
	194	handler_obj) {
	195	notify_info = acpi_ut_create_generic_state ();
	196	if (!notify_info) {
	197	return (AE_NO_MEMORY);
	198	}
	199
	200	notify_info->common.data_type = ACPI_DESC_TYPE_STATE_NOTIFY;
	201	notify_info->notify.node = node;
	202	notify_info->notify.value = (u16) notify_value;
	203	notify_info->notify.handler_obj = handler_obj;
	204
	205	status = acpi_os_queue_for_execution (OSD_PRIORITY_HIGH,
	206	acpi_ev_notify_dispatch, notify_info);
	207	if (ACPI_FAILURE (status)) {
	208	acpi_ut_delete_generic_state (notify_info);
	209	}
	210	}
	211
	212	if (!handler_obj) {
	213	/*
	214	* There is no per-device notify handler for this device.
	215	* This may or may not be a problem.
	216	*/
	217	ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
	218	"No notify handler for Notify(%4.4s, %X) node %p\n",
	219	acpi_ut_get_node_name (node), notify_value, node));
	220	}
	221
	222	return (status);
	223	}
	224
	225
226	/*******************************************************************************
227	*
228	* FUNCTION: acpi_ev_notify_dispatch
229	*
44f6c012	230	* PARAMETERS: Context - To be passed to the notify handler
1da177e4 LT	231	*
	232	* RETURN: None.
	233	*
	234	* DESCRIPTION: Dispatch a device notification event to a previously
	235	* installed handler.
	236	*
	237	******************************************************************************/
	238
44f6c012	239	static void ACPI_SYSTEM_XFACE
1da177e4 LT	240	acpi_ev_notify_dispatch (
	241	void *context)
	242	{
	243	union acpi_generic_state notify_info = (union acpi_generic_state ) context;
	244	acpi_notify_handler global_handler = NULL;
	245	void *global_context = NULL;
	246	union acpi_operand_object *handler_obj;
	247
	248
	249	ACPI_FUNCTION_ENTRY ();
	250
	251
	252	/*
	253	* We will invoke a global notify handler if installed.
44f6c012 RM	254	* This is done _before_ we invoke the per-device handler attached
44f6c012 RM	255	* to the device.
1da177e4 LT	256	*/
	257	if (notify_info->notify.value <= ACPI_MAX_SYS_NOTIFY) {
	258	/* Global system notification handler */
	259
	260	if (acpi_gbl_system_notify.handler) {
	261	global_handler = acpi_gbl_system_notify.handler;
	262	global_context = acpi_gbl_system_notify.context;
	263	}
	264	}
	265	else {
	266	/* Global driver notification handler */
	267
	268	if (acpi_gbl_device_notify.handler) {
	269	global_handler = acpi_gbl_device_notify.handler;
	270	global_context = acpi_gbl_device_notify.context;
	271	}
	272	}
	273
	274	/* Invoke the system handler first, if present */
	275
	276	if (global_handler) {
44f6c012 RM	277	global_handler (notify_info->notify.node, notify_info->notify.value,
44f6c012 RM	278	global_context);
1da177e4 LT	279	}
	280
	281	/* Now invoke the per-device handler, if present */
	282
	283	handler_obj = notify_info->notify.handler_obj;
	284	if (handler_obj) {
44f6c012 RM	285	handler_obj->notify.handler (notify_info->notify.node,
	286	notify_info->notify.value,
	287	handler_obj->notify.context);
1da177e4 LT	288	}
	289
	290	/* All done with the info object */
	291
	292	acpi_ut_delete_generic_state (notify_info);
	293	}
	294
	295
	296	/*******************************************************************************
	297	*
	298	* FUNCTION: acpi_ev_global_lock_thread
	299	*
	300	* PARAMETERS: Context - From thread interface, not used
	301	*
	302	* RETURN: None
	303	*
	304	* DESCRIPTION: Invoked by SCI interrupt handler upon acquisition of the
	305	* Global Lock. Simply signal all threads that are waiting
	306	* for the lock.
	307	*
	308	******************************************************************************/
	309
	310	static void ACPI_SYSTEM_XFACE
	311	acpi_ev_global_lock_thread (
	312	void *context)
	313	{
	314	acpi_status status;
	315
	316
	317	/* Signal threads that are waiting for the lock */
	318
	319	if (acpi_gbl_global_lock_thread_count) {
	320	/* Send sufficient units to the semaphore */
	321
	322	status = acpi_os_signal_semaphore (acpi_gbl_global_lock_semaphore,
	323	acpi_gbl_global_lock_thread_count);
	324	if (ACPI_FAILURE (status)) {
	325	ACPI_REPORT_ERROR (("Could not signal Global Lock semaphore\n"));
	326	}
	327	}
	328	}
	329
	330
	331	/*******************************************************************************
	332	*
	333	* FUNCTION: acpi_ev_global_lock_handler
	334	*
	335	* PARAMETERS: Context - From thread interface, not used
	336	*
	337	* RETURN: ACPI_INTERRUPT_HANDLED or ACPI_INTERRUPT_NOT_HANDLED
	338	*
	339	* DESCRIPTION: Invoked directly from the SCI handler when a global lock
	340	* release interrupt occurs. Grab the global lock and queue
	341	* the global lock thread for execution
	342	*
	343	******************************************************************************/
	344
	345	static u32
	346	acpi_ev_global_lock_handler (
	347	void *context)
	348	{
	349	u8 acquired = FALSE;
	350	acpi_status status;
	351
352
353	/*
354	* Attempt to get the lock
355	* If we don't get it now, it will be marked pending and we will
356	* take another interrupt when it becomes free.
357	*/
358	ACPI_ACQUIRE_GLOBAL_LOCK (acpi_gbl_common_fACS.global_lock, acquired);
359	if (acquired) {
360	/* Got the lock, now wake all threads waiting for it */
361
362	acpi_gbl_global_lock_acquired = TRUE;
363
364	/* Run the Global Lock thread which will signal all waiting threads */
365
366	status = acpi_os_queue_for_execution (OSD_PRIORITY_HIGH,
367	acpi_ev_global_lock_thread, context);
368	if (ACPI_FAILURE (status)) {
369	ACPI_REPORT_ERROR (("Could not queue Global Lock thread, %s\n",
370	acpi_format_exception (status)));
371
372	return (ACPI_INTERRUPT_NOT_HANDLED);
373	}
374	}
375
376	return (ACPI_INTERRUPT_HANDLED);
377	}
378
379
380	/*******************************************************************************
381	*
382	* FUNCTION: acpi_ev_init_global_lock_handler
383	*
384	* PARAMETERS: None
385	*
386	* RETURN: Status
387	*
388	* DESCRIPTION: Install a handler for the global lock release event
389	*
390	******************************************************************************/
391
392	acpi_status
44f6c012 RM	393	acpi_ev_init_global_lock_handler (
44f6c012 RM	394	void)
1da177e4 LT	395	{
	396	acpi_status status;
	397
	398
	399	ACPI_FUNCTION_TRACE ("ev_init_global_lock_handler");
	400
	401
	402	acpi_gbl_global_lock_present = TRUE;
	403	status = acpi_install_fixed_event_handler (ACPI_EVENT_GLOBAL,
44f6c012	404	acpi_ev_global_lock_handler, NULL);
1da177e4 LT	405
	406	/*
	407	* If the global lock does not exist on this platform, the attempt
	408	* to enable GBL_STATUS will fail (the GBL_ENABLE bit will not stick)
	409	* Map to AE_OK, but mark global lock as not present.
	410	* Any attempt to actually use the global lock will be flagged
	411	* with an error.
	412	*/
	413	if (status == AE_NO_HARDWARE_RESPONSE) {
0c9938cc RM	414	ACPI_REPORT_ERROR ((
	415	"No response from Global Lock hardware, disabling lock\n"));
	416
1da177e4 LT	417	acpi_gbl_global_lock_present = FALSE;
	418	status = AE_OK;
	419	}
	420
	421	return_ACPI_STATUS (status);
	422	}
	423
	424
	425	/******************************************************************************
	426	*
	427	* FUNCTION: acpi_ev_acquire_global_lock
	428	*
	429	* PARAMETERS: Timeout - Max time to wait for the lock, in millisec.
	430	*
	431	* RETURN: Status
	432	*
	433	* DESCRIPTION: Attempt to gain ownership of the Global Lock.
	434	*
	435	*****************************************************************************/
	436
	437	acpi_status
	438	acpi_ev_acquire_global_lock (
	439	u16 timeout)
	440	{
	441	acpi_status status = AE_OK;
	442	u8 acquired = FALSE;
	443
	444
	445	ACPI_FUNCTION_TRACE ("ev_acquire_global_lock");
	446
	447
	448	#ifndef ACPI_APPLICATION
	449	/* Make sure that we actually have a global lock */
	450
	451	if (!acpi_gbl_global_lock_present) {
	452	return_ACPI_STATUS (AE_NO_GLOBAL_LOCK);
	453	}
	454	#endif
	455
	456	/* One more thread wants the global lock */
	457
	458	acpi_gbl_global_lock_thread_count++;
	459
44f6c012 RM	460	/*
	461	* If we (OS side vs. BIOS side) have the hardware lock already,
	462	* we are done
	463	*/
1da177e4 LT	464	if (acpi_gbl_global_lock_acquired) {
	465	return_ACPI_STATUS (AE_OK);
	466	}
	467
	468	/* We must acquire the actual hardware lock */
	469
	470	ACPI_ACQUIRE_GLOBAL_LOCK (acpi_gbl_common_fACS.global_lock, acquired);
	471	if (acquired) {
	472	/* We got the lock */
	473
	474	ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Acquired the HW Global Lock\n"));
	475
	476	acpi_gbl_global_lock_acquired = TRUE;
	477	return_ACPI_STATUS (AE_OK);
	478	}
	479
	480	/*
	481	* Did not get the lock. The pending bit was set above, and we must now
	482	* wait until we get the global lock released interrupt.
	483	*/
	484	ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Waiting for the HW Global Lock\n"));
	485
	486	/*
	487	* Acquire the global lock semaphore first.
	488	* Since this wait will block, we must release the interpreter
	489	*/
	490	status = acpi_ex_system_wait_semaphore (acpi_gbl_global_lock_semaphore,
	491	timeout);
	492	return_ACPI_STATUS (status);
	493	}
	494
	495
	496	/*******************************************************************************
	497	*
	498	* FUNCTION: acpi_ev_release_global_lock
	499	*
	500	* PARAMETERS: None
	501	*
	502	* RETURN: Status
	503	*
	504	* DESCRIPTION: Releases ownership of the Global Lock.
	505	*
	506	******************************************************************************/
	507
	508	acpi_status
44f6c012 RM	509	acpi_ev_release_global_lock (
44f6c012 RM	510	void)
1da177e4 LT	511	{
	512	u8 pending = FALSE;
	513	acpi_status status = AE_OK;
	514
	515
	516	ACPI_FUNCTION_TRACE ("ev_release_global_lock");
	517
	518
	519	if (!acpi_gbl_global_lock_thread_count) {
44f6c012 RM	520	ACPI_REPORT_WARNING((
44f6c012 RM	521	"Cannot release HW Global Lock, it has not been acquired\n"));
1da177e4 LT	522	return_ACPI_STATUS (AE_NOT_ACQUIRED);
	523	}
	524
	525	/* One fewer thread has the global lock */
	526
	527	acpi_gbl_global_lock_thread_count--;
	528	if (acpi_gbl_global_lock_thread_count) {
	529	/* There are still some threads holding the lock, cannot release */
	530
	531	return_ACPI_STATUS (AE_OK);
	532	}
	533
	534	/*
	535	* No more threads holding lock, we can do the actual hardware
	536	* release
	537	*/
	538	ACPI_RELEASE_GLOBAL_LOCK (acpi_gbl_common_fACS.global_lock, pending);
	539	acpi_gbl_global_lock_acquired = FALSE;
	540
	541	/*
	542	* If the pending bit was set, we must write GBL_RLS to the control
	543	* register
	544	*/
	545	if (pending) {
44f6c012 RM	546	status = acpi_set_register (ACPI_BITREG_GLOBAL_LOCK_RELEASE,
44f6c012 RM	547	1, ACPI_MTX_LOCK);
1da177e4 LT	548	}
	549
	550	return_ACPI_STATUS (status);
	551	}
	552
	553
	554	/******************************************************************************
	555	*
	556	* FUNCTION: acpi_ev_terminate
	557	*
	558	* PARAMETERS: none
	559	*
	560	* RETURN: none
	561	*
	562	* DESCRIPTION: Disable events and free memory allocated for table storage.
	563	*
	564	******************************************************************************/
	565
	566	void
44f6c012 RM	567	acpi_ev_terminate (
44f6c012 RM	568	void)
1da177e4 LT	569	{
	570	acpi_native_uint i;
	571	acpi_status status;
	572
	573
	574	ACPI_FUNCTION_TRACE ("ev_terminate");
	575
	576
	577	if (acpi_gbl_events_initialized) {
	578	/*
	579	* Disable all event-related functionality.
	580	* In all cases, on error, print a message but obviously we don't abort.
	581	*/
	582
	583	/* Disable all fixed events */
	584
	585	for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
	586	status = acpi_disable_event ((u32) i, 0);
	587	if (ACPI_FAILURE (status)) {
44f6c012 RM	588	ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
44f6c012 RM	589	"Could not disable fixed event %d\n", (u32) i));
1da177e4 LT	590	}
	591	}
	592
	593	/* Disable all GPEs in all GPE blocks */
	594
73459f73	595	status = acpi_ev_walk_gpe_list (acpi_hw_disable_gpe_block);
1da177e4 LT	596
	597	/* Remove SCI handler */
	598
	599	status = acpi_ev_remove_sci_handler ();
	600	if (ACPI_FAILURE(status)) {
44f6c012 RM	601	ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
44f6c012 RM	602	"Could not remove SCI handler\n"));
1da177e4 LT	603	}
	604	}
	605
	606	/* Deallocate all handler objects installed within GPE info structs */
	607
73459f73	608	status = acpi_ev_walk_gpe_list (acpi_ev_delete_gpe_handlers);
1da177e4 LT	609
	610	/* Return to original mode if necessary */
	611
	612	if (acpi_gbl_original_mode == ACPI_SYS_MODE_LEGACY) {
	613	status = acpi_disable ();
	614	if (ACPI_FAILURE (status)) {
	615	ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "acpi_disable failed\n"));
	616	}
	617	}
	618	return_VOID;
	619	}
	620