[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / acpi / acpica / evgpeutil.c

/******************************************************************************
 *
 * Module Name: evgpeutil - GPE utilities
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2013, 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.
 */

#include <acpi/acpi.h>
#include "accommon.h"
#include "acevents.h"

#define _COMPONENT          ACPI_EVENTS
ACPI_MODULE_NAME("evgpeutil")

#if (!ACPI_REDUCED_HARDWARE)	/* Entire module */
/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_walk_gpe_list
 *
 * PARAMETERS:  gpe_walk_callback   - Routine called for each GPE block
 *              context             - Value passed to callback
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Walk the GPE lists.
 *
 ******************************************************************************/
acpi_status
acpi_ev_walk_gpe_list(acpi_gpe_callback gpe_walk_callback, void *context)
{
	struct acpi_gpe_block_info *gpe_block;
	struct acpi_gpe_xrupt_info *gpe_xrupt_info;
	acpi_status status = AE_OK;
	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(ev_walk_gpe_list);

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	/* Walk the interrupt level descriptor list */

	gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
	while (gpe_xrupt_info) {

		/* Walk all Gpe Blocks attached to this interrupt level */

		gpe_block = gpe_xrupt_info->gpe_block_list_head;
		while (gpe_block) {

			/* One callback per GPE block */

			status =
			    gpe_walk_callback(gpe_xrupt_info, gpe_block,
					      context);
			if (ACPI_FAILURE(status)) {
				if (status == AE_CTRL_END) {	/* Callback abort */
					status = AE_OK;
				}
				goto unlock_and_exit;
			}

			gpe_block = gpe_block->next;
		}

		gpe_xrupt_info = gpe_xrupt_info->next;
	}

      unlock_and_exit:
	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_valid_gpe_event
 *
 * PARAMETERS:  gpe_event_info              - Info for this GPE
 *
 * RETURN:      TRUE if the gpe_event is valid
 *
 * DESCRIPTION: Validate a GPE event. DO NOT CALL FROM INTERRUPT LEVEL.
 *              Should be called only when the GPE lists are semaphore locked
 *              and not subject to change.
 *
 ******************************************************************************/

u8 acpi_ev_valid_gpe_event(struct acpi_gpe_event_info *gpe_event_info)
{
	struct acpi_gpe_xrupt_info *gpe_xrupt_block;
	struct acpi_gpe_block_info *gpe_block;

	ACPI_FUNCTION_ENTRY();

	/* No need for spin lock since we are not changing any list elements */

	/* Walk the GPE interrupt levels */

	gpe_xrupt_block = acpi_gbl_gpe_xrupt_list_head;
	while (gpe_xrupt_block) {
		gpe_block = gpe_xrupt_block->gpe_block_list_head;

		/* Walk the GPE blocks on this interrupt level */

		while (gpe_block) {
			if ((&gpe_block->event_info[0] <= gpe_event_info) &&
			    (&gpe_block->event_info[gpe_block->gpe_count] >
			     gpe_event_info)) {
				return (TRUE);
			}

			gpe_block = gpe_block->next;
		}

		gpe_xrupt_block = gpe_xrupt_block->next;
	}

	return (FALSE);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_get_gpe_device
 *
 * PARAMETERS:  GPE_WALK_CALLBACK
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Matches the input GPE index (0-current_gpe_count) with a GPE
 *              block device. NULL if the GPE is one of the FADT-defined GPEs.
 *
 ******************************************************************************/

acpi_status
acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
		       struct acpi_gpe_block_info *gpe_block, void *context)
{
	struct acpi_gpe_device_info *info = context;

	/* Increment Index by the number of GPEs in this block */

	info->next_block_base_index += gpe_block->gpe_count;

	if (info->index < info->next_block_base_index) {
		/*
		 * The GPE index is within this block, get the node. Leave the node
		 * NULL for the FADT-defined GPEs
		 */
		if ((gpe_block->node)->type == ACPI_TYPE_DEVICE) {
			info->gpe_device = gpe_block->node;
		}

		info->status = AE_OK;
		return (AE_CTRL_END);
	}

	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_get_gpe_xrupt_block
 *
 * PARAMETERS:  interrupt_number     - Interrupt for a GPE block
 *
 * RETURN:      A GPE interrupt block
 *
 * DESCRIPTION: Get or Create a GPE interrupt block. There is one interrupt
 *              block per unique interrupt level used for GPEs. Should be
 *              called only when the GPE lists are semaphore locked and not
 *              subject to change.
 *
 ******************************************************************************/

struct acpi_gpe_xrupt_info *acpi_ev_get_gpe_xrupt_block(u32 interrupt_number)
{
	struct acpi_gpe_xrupt_info *next_gpe_xrupt;
	struct acpi_gpe_xrupt_info *gpe_xrupt;
	acpi_status status;
	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(ev_get_gpe_xrupt_block);

	/* No need for lock since we are not changing any list elements here */

	next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
	while (next_gpe_xrupt) {
		if (next_gpe_xrupt->interrupt_number == interrupt_number) {
			return_PTR(next_gpe_xrupt);
		}

		next_gpe_xrupt = next_gpe_xrupt->next;
	}

	/* Not found, must allocate a new xrupt descriptor */

	gpe_xrupt = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_xrupt_info));
	if (!gpe_xrupt) {
		return_PTR(NULL);
	}

	gpe_xrupt->interrupt_number = interrupt_number;

	/* Install new interrupt descriptor with spin lock */

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
	if (acpi_gbl_gpe_xrupt_list_head) {
		next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
		while (next_gpe_xrupt->next) {
			next_gpe_xrupt = next_gpe_xrupt->next;
		}

		next_gpe_xrupt->next = gpe_xrupt;
		gpe_xrupt->previous = next_gpe_xrupt;
	} else {
		acpi_gbl_gpe_xrupt_list_head = gpe_xrupt;
	}
	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);

	/* Install new interrupt handler if not SCI_INT */

	if (interrupt_number != acpi_gbl_FADT.sci_interrupt) {
		status = acpi_os_install_interrupt_handler(interrupt_number,
							   acpi_ev_gpe_xrupt_handler,
							   gpe_xrupt);
		if (ACPI_FAILURE(status)) {
			ACPI_ERROR((AE_INFO,
				    "Could not install GPE interrupt handler at level 0x%X",
				    interrupt_number));
			return_PTR(NULL);
		}
	}

	return_PTR(gpe_xrupt);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_delete_gpe_xrupt
 *
 * PARAMETERS:  gpe_xrupt       - A GPE interrupt info block
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Remove and free a gpe_xrupt block. Remove an associated
 *              interrupt handler if not the SCI interrupt.
 *
 ******************************************************************************/

acpi_status acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt)
{
	acpi_status status;
	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(ev_delete_gpe_xrupt);

	/* We never want to remove the SCI interrupt handler */

	if (gpe_xrupt->interrupt_number == acpi_gbl_FADT.sci_interrupt) {
		gpe_xrupt->gpe_block_list_head = NULL;
		return_ACPI_STATUS(AE_OK);
	}

	/* Disable this interrupt */

	status =
	    acpi_os_remove_interrupt_handler(gpe_xrupt->interrupt_number,
					     acpi_ev_gpe_xrupt_handler);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Unlink the interrupt block with lock */

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
	if (gpe_xrupt->previous) {
		gpe_xrupt->previous->next = gpe_xrupt->next;
	} else {
		/* No previous, update list head */

		acpi_gbl_gpe_xrupt_list_head = gpe_xrupt->next;
	}

	if (gpe_xrupt->next) {
		gpe_xrupt->next->previous = gpe_xrupt->previous;
	}
	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);

	/* Free the block */

	ACPI_FREE(gpe_xrupt);
	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_delete_gpe_handlers
 *
 * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 *              gpe_block           - Gpe Block info
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Delete all Handler objects found in the GPE data structs.
 *              Used only prior to termination.
 *
 ******************************************************************************/

acpi_status
acpi_ev_delete_gpe_handlers(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
			    struct acpi_gpe_block_info *gpe_block,
			    void *context)
{
	struct acpi_gpe_event_info *gpe_event_info;
	struct acpi_gpe_notify_info *notify;
	struct acpi_gpe_notify_info *next;
	u32 i;
	u32 j;

	ACPI_FUNCTION_TRACE(ev_delete_gpe_handlers);

	/* Examine each GPE Register within the block */

	for (i = 0; i < gpe_block->register_count; i++) {

		/* Now look at the individual GPEs in this byte register */

		for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
			gpe_event_info = &gpe_block->event_info[((acpi_size) i *
								 ACPI_GPE_REGISTER_WIDTH)
								+ j];

			if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
			    ACPI_GPE_DISPATCH_HANDLER) {

				/* Delete an installed handler block */

				ACPI_FREE(gpe_event_info->dispatch.handler);
				gpe_event_info->dispatch.handler = NULL;
				gpe_event_info->flags &=
				    ~ACPI_GPE_DISPATCH_MASK;
			} else
			    if ((gpe_event_info->
				 flags & ACPI_GPE_DISPATCH_MASK) ==
				ACPI_GPE_DISPATCH_NOTIFY) {

				/* Delete the implicit notification device list */

				notify = gpe_event_info->dispatch.notify_list;
				while (notify) {
					next = notify->next;
					ACPI_FREE(notify);
					notify = next;
				}
				gpe_event_info->dispatch.notify_list = NULL;
				gpe_event_info->flags &=
				    ~ACPI_GPE_DISPATCH_MASK;
			}
		}
	}

	return_ACPI_STATUS(AE_OK);
}

#endif				/* !ACPI_REDUCED_HARDWARE */
Commit	Line	Data
3fe50208 BM	1	/******************************************************************************
	2	*
	3	* Module Name: evgpeutil - GPE utilities
	4	*
	5	*****************************************************************************/
	6
	7	/*
25f044e6	8	* Copyright (C) 2000 - 2013, Intel Corp.
3fe50208 BM	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 "accommon.h"
	46	#include "acevents.h"
	47
	48	#define _COMPONENT ACPI_EVENTS
	49	ACPI_MODULE_NAME("evgpeutil")
	50
33620c54	51	#if (!ACPI_REDUCED_HARDWARE) /* Entire module */
3fe50208 BM	52	/*******************************************************************************
	53	*
	54	* FUNCTION: acpi_ev_walk_gpe_list
	55	*
	56	* PARAMETERS: gpe_walk_callback - Routine called for each GPE block
ba494bee	57	* context - Value passed to callback
3fe50208 BM	58	*
	59	* RETURN: Status
	60	*
	61	* DESCRIPTION: Walk the GPE lists.
	62	*
	63	******************************************************************************/
	64	acpi_status
	65	acpi_ev_walk_gpe_list(acpi_gpe_callback gpe_walk_callback, void *context)
	66	{
	67	struct acpi_gpe_block_info *gpe_block;
	68	struct acpi_gpe_xrupt_info *gpe_xrupt_info;
	69	acpi_status status = AE_OK;
	70	acpi_cpu_flags flags;
	71
	72	ACPI_FUNCTION_TRACE(ev_walk_gpe_list);
	73
	74	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
	75
	76	/* Walk the interrupt level descriptor list */
	77
	78	gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
	79	while (gpe_xrupt_info) {
	80
	81	/* Walk all Gpe Blocks attached to this interrupt level */
	82
	83	gpe_block = gpe_xrupt_info->gpe_block_list_head;
	84	while (gpe_block) {
	85
	86	/* One callback per GPE block */
	87
	88	status =
	89	gpe_walk_callback(gpe_xrupt_info, gpe_block,
	90	context);
	91	if (ACPI_FAILURE(status)) {
	92	if (status == AE_CTRL_END) { /* Callback abort */
	93	status = AE_OK;
	94	}
	95	goto unlock_and_exit;
	96	}
	97
	98	gpe_block = gpe_block->next;
	99	}
	100
	101	gpe_xrupt_info = gpe_xrupt_info->next;
	102	}
	103
	104	unlock_and_exit:
	105	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	106	return_ACPI_STATUS(status);
	107	}
	108
	109	/*******************************************************************************
	110	*
	111	* FUNCTION: acpi_ev_valid_gpe_event
	112	*
	113	* PARAMETERS: gpe_event_info - Info for this GPE
	114	*
	115	* RETURN: TRUE if the gpe_event is valid
	116	*
	117	* DESCRIPTION: Validate a GPE event. DO NOT CALL FROM INTERRUPT LEVEL.
	118	* Should be called only when the GPE lists are semaphore locked
	119	* and not subject to change.
	120	*
	121	******************************************************************************/
122
123	u8 acpi_ev_valid_gpe_event(struct acpi_gpe_event_info *gpe_event_info)
124	{
125	struct acpi_gpe_xrupt_info *gpe_xrupt_block;
126	struct acpi_gpe_block_info *gpe_block;
127
128	ACPI_FUNCTION_ENTRY();
129
130	/* No need for spin lock since we are not changing any list elements */
131
132	/* Walk the GPE interrupt levels */
133
134	gpe_xrupt_block = acpi_gbl_gpe_xrupt_list_head;
135	while (gpe_xrupt_block) {
136	gpe_block = gpe_xrupt_block->gpe_block_list_head;
137
138	/* Walk the GPE blocks on this interrupt level */
139
140	while (gpe_block) {
141	if ((&gpe_block->event_info[0] <= gpe_event_info) &&
142	(&gpe_block->event_info[gpe_block->gpe_count] >
143	gpe_event_info)) {
144	return (TRUE);
145	}
146
147	gpe_block = gpe_block->next;
148	}
149
150	gpe_xrupt_block = gpe_xrupt_block->next;
151	}
152
153	return (FALSE);
154	}
155
3cfd53d5 LM	156	/*******************************************************************************
	157	*
	158	* FUNCTION: acpi_ev_get_gpe_device
	159	*
	160	* PARAMETERS: GPE_WALK_CALLBACK
	161	*
	162	* RETURN: Status
	163	*
	164	* DESCRIPTION: Matches the input GPE index (0-current_gpe_count) with a GPE
	165	* block device. NULL if the GPE is one of the FADT-defined GPEs.
	166	*
	167	******************************************************************************/
	168
	169	acpi_status
	170	acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
	171	struct acpi_gpe_block_info gpe_block, void context)
	172	{
	173	struct acpi_gpe_device_info *info = context;
	174
	175	/* Increment Index by the number of GPEs in this block */
	176
	177	info->next_block_base_index += gpe_block->gpe_count;
	178
	179	if (info->index < info->next_block_base_index) {
	180	/*
	181	* The GPE index is within this block, get the node. Leave the node
	182	* NULL for the FADT-defined GPEs
	183	*/
	184	if ((gpe_block->node)->type == ACPI_TYPE_DEVICE) {
	185	info->gpe_device = gpe_block->node;
	186	}
	187
	188	info->status = AE_OK;
	189	return (AE_CTRL_END);
	190	}
	191
	192	return (AE_OK);
	193	}
	194
3fe50208 BM	195	/*******************************************************************************
	196	*
	197	* FUNCTION: acpi_ev_get_gpe_xrupt_block
	198	*
	199	* PARAMETERS: interrupt_number - Interrupt for a GPE block
	200	*
	201	* RETURN: A GPE interrupt block
	202	*
	203	* DESCRIPTION: Get or Create a GPE interrupt block. There is one interrupt
	204	* block per unique interrupt level used for GPEs. Should be
	205	* called only when the GPE lists are semaphore locked and not
	206	* subject to change.
	207	*
	208	******************************************************************************/
	209
	210	struct acpi_gpe_xrupt_info *acpi_ev_get_gpe_xrupt_block(u32 interrupt_number)
	211	{
	212	struct acpi_gpe_xrupt_info *next_gpe_xrupt;
	213	struct acpi_gpe_xrupt_info *gpe_xrupt;
	214	acpi_status status;
	215	acpi_cpu_flags flags;
	216
	217	ACPI_FUNCTION_TRACE(ev_get_gpe_xrupt_block);
	218
	219	/* No need for lock since we are not changing any list elements here */
	220
	221	next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
	222	while (next_gpe_xrupt) {
	223	if (next_gpe_xrupt->interrupt_number == interrupt_number) {
	224	return_PTR(next_gpe_xrupt);
	225	}
	226
	227	next_gpe_xrupt = next_gpe_xrupt->next;
	228	}
	229
	230	/* Not found, must allocate a new xrupt descriptor */
	231
	232	gpe_xrupt = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_xrupt_info));
	233	if (!gpe_xrupt) {
	234	return_PTR(NULL);
	235	}
	236
	237	gpe_xrupt->interrupt_number = interrupt_number;
	238
	239	/* Install new interrupt descriptor with spin lock */
	240
	241	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
	242	if (acpi_gbl_gpe_xrupt_list_head) {
	243	next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
	244	while (next_gpe_xrupt->next) {
	245	next_gpe_xrupt = next_gpe_xrupt->next;
	246	}
	247
	248	next_gpe_xrupt->next = gpe_xrupt;
	249	gpe_xrupt->previous = next_gpe_xrupt;
	250	} else {
	251	acpi_gbl_gpe_xrupt_list_head = gpe_xrupt;
	252	}
	253	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	254
	255	/* Install new interrupt handler if not SCI_INT */
	256
	257	if (interrupt_number != acpi_gbl_FADT.sci_interrupt) {
	258	status = acpi_os_install_interrupt_handler(interrupt_number,
259	acpi_ev_gpe_xrupt_handler,
260	gpe_xrupt);
261	if (ACPI_FAILURE(status)) {
262	ACPI_ERROR((AE_INFO,
263	"Could not install GPE interrupt handler at level 0x%X",
264	interrupt_number));
265	return_PTR(NULL);
266	}
267	}
268
269	return_PTR(gpe_xrupt);
270	}
271
272	/*******************************************************************************
273	*
274	* FUNCTION: acpi_ev_delete_gpe_xrupt
275	*
276	* PARAMETERS: gpe_xrupt - A GPE interrupt info block
277	*
278	* RETURN: Status
279	*
280	* DESCRIPTION: Remove and free a gpe_xrupt block. Remove an associated
281	* interrupt handler if not the SCI interrupt.
282	*
283	******************************************************************************/
284
285	acpi_status acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt)
286	{
287	acpi_status status;
288	acpi_cpu_flags flags;
289
290	ACPI_FUNCTION_TRACE(ev_delete_gpe_xrupt);
291
292	/* We never want to remove the SCI interrupt handler */
293
294	if (gpe_xrupt->interrupt_number == acpi_gbl_FADT.sci_interrupt) {
295	gpe_xrupt->gpe_block_list_head = NULL;
296	return_ACPI_STATUS(AE_OK);
297	}
298
299	/* Disable this interrupt */
300
301	status =
302	acpi_os_remove_interrupt_handler(gpe_xrupt->interrupt_number,
303	acpi_ev_gpe_xrupt_handler);
304	if (ACPI_FAILURE(status)) {
305	return_ACPI_STATUS(status);
306	}
307
308	/* Unlink the interrupt block with lock */
309
310	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
311	if (gpe_xrupt->previous) {
312	gpe_xrupt->previous->next = gpe_xrupt->next;
313	} else {
314	/* No previous, update list head */
315
316	acpi_gbl_gpe_xrupt_list_head = gpe_xrupt->next;
317	}
318
319	if (gpe_xrupt->next) {
320	gpe_xrupt->next->previous = gpe_xrupt->previous;
321	}
322	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
323
324	/* Free the block */
325
326	ACPI_FREE(gpe_xrupt);
327	return_ACPI_STATUS(AE_OK);
328	}
329
330	/*******************************************************************************
331	*
332	* FUNCTION: acpi_ev_delete_gpe_handlers
333	*
334	* PARAMETERS: gpe_xrupt_info - GPE Interrupt info
335	* gpe_block - Gpe Block info
336	*
337	* RETURN: Status
338	*
339	* DESCRIPTION: Delete all Handler objects found in the GPE data structs.
340	* Used only prior to termination.
341	*
342	******************************************************************************/
343
344	acpi_status
345	acpi_ev_delete_gpe_handlers(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
346	struct acpi_gpe_block_info *gpe_block,
347	void *context)
348	{
349	struct acpi_gpe_event_info *gpe_event_info;
5816b343 BM	350	struct acpi_gpe_notify_info *notify;
5816b343 BM	351	struct acpi_gpe_notify_info *next;
3fe50208 BM	352	u32 i;
	353	u32 j;
	354
	355	ACPI_FUNCTION_TRACE(ev_delete_gpe_handlers);
	356
	357	/* Examine each GPE Register within the block */
	358
	359	for (i = 0; i < gpe_block->register_count; i++) {
	360
	361	/* Now look at the individual GPEs in this byte register */
	362
	363	for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
	364	gpe_event_info = &gpe_block->event_info[((acpi_size) i *
	365	ACPI_GPE_REGISTER_WIDTH)
	366	+ j];
	367
	368	if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
	369	ACPI_GPE_DISPATCH_HANDLER) {
5816b343 BM	370
	371	/* Delete an installed handler block */
	372
3fe50208 BM	373	ACPI_FREE(gpe_event_info->dispatch.handler);
	374	gpe_event_info->dispatch.handler = NULL;
	375	gpe_event_info->flags &=
	376	~ACPI_GPE_DISPATCH_MASK;
1f86e8c1 LZ	377	} else
1f86e8c1 LZ	378	if ((gpe_event_info->
5816b343 BM	379	flags & ACPI_GPE_DISPATCH_MASK) ==
	380	ACPI_GPE_DISPATCH_NOTIFY) {
	381
	382	/* Delete the implicit notification device list */
	383
	384	notify = gpe_event_info->dispatch.notify_list;
	385	while (notify) {
	386	next = notify->next;
	387	ACPI_FREE(notify);
	388	notify = next;
	389	}
	390	gpe_event_info->dispatch.notify_list = NULL;
	391	gpe_event_info->flags &=
	392	~ACPI_GPE_DISPATCH_MASK;
3fe50208 BM	393	}
	394	}
	395	}
	396
	397	return_ACPI_STATUS(AE_OK);
	398	}
33620c54 BM	399
33620c54 BM	400	#endif /* !ACPI_REDUCED_HARDWARE */