[deliverable/linux.git] / drivers / acpi / acpica / evgpeinit.c

/******************************************************************************
 *
 * Module Name: evgpeinit - System GPE initialization and update
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2010, 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"
#include "acnamesp.h"
#include "acinterp.h"

#define _COMPONENT          ACPI_EVENTS
ACPI_MODULE_NAME("evgpeinit")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_gpe_initialize
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Initialize the GPE data structures and the FADT GPE 0/1 blocks
 *
 ******************************************************************************/
acpi_status acpi_ev_gpe_initialize(void)
{
	u32 register_count0 = 0;
	u32 register_count1 = 0;
	u32 gpe_number_max = 0;
	acpi_status status;

	ACPI_FUNCTION_TRACE(ev_gpe_initialize);

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/*
	 * Initialize the GPE Block(s) defined in the FADT
	 *
	 * Why the GPE register block lengths are divided by 2:  From the ACPI
	 * Spec, section "General-Purpose Event Registers", we have:
	 *
	 * "Each register block contains two registers of equal length
	 *  GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
	 *  GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
	 *  The length of the GPE1_STS and GPE1_EN registers is equal to
	 *  half the GPE1_LEN. If a generic register block is not supported
	 *  then its respective block pointer and block length values in the
	 *  FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
	 *  to be the same size."
	 */

	/*
	 * Determine the maximum GPE number for this machine.
	 *
	 * Note: both GPE0 and GPE1 are optional, and either can exist without
	 * the other.
	 *
	 * If EITHER the register length OR the block address are zero, then that
	 * particular block is not supported.
	 */
	if (acpi_gbl_FADT.gpe0_block_length &&
	    acpi_gbl_FADT.xgpe0_block.address) {

		/* GPE block 0 exists (has both length and address > 0) */

		register_count0 = (u16)(acpi_gbl_FADT.gpe0_block_length / 2);

		gpe_number_max =
		    (register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1;

		/* Install GPE Block 0 */

		status = acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
						  &acpi_gbl_FADT.xgpe0_block,
						  register_count0, 0,
						  acpi_gbl_FADT.sci_interrupt,
						  &acpi_gbl_gpe_fadt_blocks[0]);

		if (ACPI_FAILURE(status)) {
			ACPI_EXCEPTION((AE_INFO, status,
					"Could not create GPE Block 0"));
		}
	}

	if (acpi_gbl_FADT.gpe1_block_length &&
	    acpi_gbl_FADT.xgpe1_block.address) {

		/* GPE block 1 exists (has both length and address > 0) */

		register_count1 = (u16)(acpi_gbl_FADT.gpe1_block_length / 2);

		/* Check for GPE0/GPE1 overlap (if both banks exist) */

		if ((register_count0) &&
		    (gpe_number_max >= acpi_gbl_FADT.gpe1_base)) {
			ACPI_ERROR((AE_INFO,
				    "GPE0 block (GPE 0 to %u) overlaps the GPE1 block "
				    "(GPE %u to %u) - Ignoring GPE1",
				    gpe_number_max, acpi_gbl_FADT.gpe1_base,
				    acpi_gbl_FADT.gpe1_base +
				    ((register_count1 *
				      ACPI_GPE_REGISTER_WIDTH) - 1)));

			/* Ignore GPE1 block by setting the register count to zero */

			register_count1 = 0;
		} else {
			/* Install GPE Block 1 */

			status =
			    acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
						     &acpi_gbl_FADT.xgpe1_block,
						     register_count1,
						     acpi_gbl_FADT.gpe1_base,
						     acpi_gbl_FADT.
						     sci_interrupt,
						     &acpi_gbl_gpe_fadt_blocks
						     [1]);

			if (ACPI_FAILURE(status)) {
				ACPI_EXCEPTION((AE_INFO, status,
						"Could not create GPE Block 1"));
			}

			/*
			 * GPE0 and GPE1 do not have to be contiguous in the GPE number
			 * space. However, GPE0 always starts at GPE number zero.
			 */
			gpe_number_max = acpi_gbl_FADT.gpe1_base +
			    ((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1);
		}
	}

	/* Exit if there are no GPE registers */

	if ((register_count0 + register_count1) == 0) {

		/* GPEs are not required by ACPI, this is OK */

		ACPI_DEBUG_PRINT((ACPI_DB_INIT,
				  "There are no GPE blocks defined in the FADT\n"));
		status = AE_OK;
		goto cleanup;
	}

	/* Check for Max GPE number out-of-range */

	if (gpe_number_max > ACPI_GPE_MAX) {
		ACPI_ERROR((AE_INFO,
			    "Maximum GPE number from FADT is too large: 0x%X",
			    gpe_number_max));
		status = AE_BAD_VALUE;
		goto cleanup;
	}

      cleanup:
	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_update_gpes
 *
 * PARAMETERS:  table_owner_id      - ID of the newly-loaded ACPI table
 *
 * RETURN:      None
 *
 * DESCRIPTION: Check for new GPE methods (_Lxx/_Exx) made available as a
 *              result of a Load() or load_table() operation. If new GPE
 *              methods have been installed, register the new methods.
 *
 ******************************************************************************/

void acpi_ev_update_gpes(acpi_owner_id table_owner_id)
{
	struct acpi_gpe_xrupt_info *gpe_xrupt_info;
	struct acpi_gpe_block_info *gpe_block;
	struct acpi_gpe_walk_info walk_info;
	acpi_status status = AE_OK;

	/*
	 * 2) Find any _Lxx/_Exx GPE methods that have just been loaded.
	 *
	 * Any GPEs that correspond to new _Lxx/_Exx methods are immediately
	 * enabled.
	 *
	 * Examine the namespace underneath each gpe_device within the
	 * gpe_block lists.
	 */
	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
	if (ACPI_FAILURE(status)) {
		return;
	}

	walk_info.owner_id = table_owner_id;
	walk_info.execute_by_owner_id = TRUE;
	walk_info.count = 0;

	/* 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) {
			walk_info.gpe_block = gpe_block;
			walk_info.gpe_device = gpe_block->node;

			status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD,
							walk_info.gpe_device,
							ACPI_UINT32_MAX,
							ACPI_NS_WALK_NO_UNLOCK,
							acpi_ev_match_gpe_method,
							NULL, &walk_info, NULL);
			if (ACPI_FAILURE(status)) {
				ACPI_EXCEPTION((AE_INFO, status,
						"While decoding _Lxx/_Exx methods"));
			}

			gpe_block = gpe_block->next;
		}

		gpe_xrupt_info = gpe_xrupt_info->next;
	}

	if (walk_info.count) {
		ACPI_INFO((AE_INFO, "Enabled %u new GPEs", walk_info.count));
	}

	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
	return;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_match_gpe_method
 *
 * PARAMETERS:  Callback from walk_namespace
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
 *              control method under the _GPE portion of the namespace.
 *              Extract the name and GPE type from the object, saving this
 *              information for quick lookup during GPE dispatch. Allows a
 *              per-owner_id evaluation if execute_by_owner_id is TRUE in the
 *              walk_info parameter block.
 *
 *              The name of each GPE control method is of the form:
 *              "_Lxx" or "_Exx", where:
 *                  L      - means that the GPE is level triggered
 *                  E      - means that the GPE is edge triggered
 *                  xx     - is the GPE number [in HEX]
 *
 * If walk_info->execute_by_owner_id is TRUE, we only execute examine GPE methods
 *    with that owner.
 *
 ******************************************************************************/

acpi_status
acpi_ev_match_gpe_method(acpi_handle obj_handle,
			 u32 level, void *context, void **return_value)
{
	struct acpi_namespace_node *method_node =
	    ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
	struct acpi_gpe_walk_info *walk_info =
	    ACPI_CAST_PTR(struct acpi_gpe_walk_info, context);
	struct acpi_gpe_event_info *gpe_event_info;
	u32 gpe_number;
	char name[ACPI_NAME_SIZE + 1];
	u8 type;

	ACPI_FUNCTION_TRACE(ev_match_gpe_method);

	/* Check if requested owner_id matches this owner_id */

	if ((walk_info->execute_by_owner_id) &&
	    (method_node->owner_id != walk_info->owner_id)) {
		return_ACPI_STATUS(AE_OK);
	}

	/*
	 * Match and decode the _Lxx and _Exx GPE method names
	 *
	 * 1) Extract the method name and null terminate it
	 */
	ACPI_MOVE_32_TO_32(name, &method_node->name.integer);
	name[ACPI_NAME_SIZE] = 0;

	/* 2) Name must begin with an underscore */

	if (name[0] != '_') {
		return_ACPI_STATUS(AE_OK);	/* Ignore this method */
	}

	/*
	 * 3) Edge/Level determination is based on the 2nd character
	 *    of the method name
	 */
	switch (name[1]) {
	case 'L':
		type = ACPI_GPE_LEVEL_TRIGGERED;
		break;

	case 'E':
		type = ACPI_GPE_EDGE_TRIGGERED;
		break;

	default:
		/* Unknown method type, just ignore it */

		ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
				  "Ignoring unknown GPE method type: %s "
				  "(name not of form _Lxx or _Exx)", name));
		return_ACPI_STATUS(AE_OK);
	}

	/* 4) The last two characters of the name are the hex GPE Number */

	gpe_number = ACPI_STRTOUL(&name[2], NULL, 16);
	if (gpe_number == ACPI_UINT32_MAX) {

		/* Conversion failed; invalid method, just ignore it */

		ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
				  "Could not extract GPE number from name: %s "
				  "(name is not of form _Lxx or _Exx)", name));
		return_ACPI_STATUS(AE_OK);
	}

	/* Ensure that we have a valid GPE number for this GPE block */

	gpe_event_info =
	    acpi_ev_low_get_gpe_info(gpe_number, walk_info->gpe_block);
	if (!gpe_event_info) {
		/*
		 * This gpe_number is not valid for this GPE block, just ignore it.
		 * However, it may be valid for a different GPE block, since GPE0
		 * and GPE1 methods both appear under \_GPE.
		 */
		return_ACPI_STATUS(AE_OK);
	}

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

		/* If there is already a handler, ignore this GPE method */

		return_ACPI_STATUS(AE_OK);
	}

	if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
	    ACPI_GPE_DISPATCH_METHOD) {
		/*
		 * If there is already a method, ignore this method. But check
		 * for a type mismatch (if both the _Lxx AND _Exx exist)
		 */
		if (type != (gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK)) {
			ACPI_ERROR((AE_INFO,
				    "For GPE 0x%.2X, found both _L%2.2X and _E%2.2X methods",
				    gpe_number, gpe_number, gpe_number));
		}
		return_ACPI_STATUS(AE_OK);
	}

	/*
	 * Add the GPE information from above to the gpe_event_info block for
	 * use during dispatch of this GPE.
	 */
	gpe_event_info->flags |= (u8)(type | ACPI_GPE_DISPATCH_METHOD);
	gpe_event_info->dispatch.method_node = method_node;

	ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
			  "Registered GPE method %s as GPE number 0x%.2X\n",
			  name, gpe_number));
	return_ACPI_STATUS(AE_OK);
}
Commit	Line	Data
3fe50208 BM	1	/******************************************************************************
	2	*
	3	* Module Name: evgpeinit - System GPE initialization and update
	4	*
	5	*****************************************************************************/
	6
	7	/*
	8	* Copyright (C) 2000 - 2010, Intel Corp.
	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	#include "acnamesp.h"
	48	#include "acinterp.h"
	49
	50	#define _COMPONENT ACPI_EVENTS
	51	ACPI_MODULE_NAME("evgpeinit")
	52
	53	/*******************************************************************************
	54	*
	55	* FUNCTION: acpi_ev_gpe_initialize
	56	*
	57	* PARAMETERS: None
	58	*
	59	* RETURN: Status
	60	*
	61	* DESCRIPTION: Initialize the GPE data structures and the FADT GPE 0/1 blocks
	62	*
	63	******************************************************************************/
	64	acpi_status acpi_ev_gpe_initialize(void)
65	{
66	u32 register_count0 = 0;
67	u32 register_count1 = 0;
68	u32 gpe_number_max = 0;
69	acpi_status status;
70
71	ACPI_FUNCTION_TRACE(ev_gpe_initialize);
72
73	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
74	if (ACPI_FAILURE(status)) {
75	return_ACPI_STATUS(status);
76	}
77
78	/*
79	* Initialize the GPE Block(s) defined in the FADT
80	*
81	* Why the GPE register block lengths are divided by 2: From the ACPI
82	* Spec, section "General-Purpose Event Registers", we have:
83	*
84	* "Each register block contains two registers of equal length
85	* GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
86	* GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
87	* The length of the GPE1_STS and GPE1_EN registers is equal to
88	* half the GPE1_LEN. If a generic register block is not supported
89	* then its respective block pointer and block length values in the
90	* FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
91	* to be the same size."
92	*/
93
94	/*
95	* Determine the maximum GPE number for this machine.
96	*
97	* Note: both GPE0 and GPE1 are optional, and either can exist without
98	* the other.
99	*
100	* If EITHER the register length OR the block address are zero, then that
101	* particular block is not supported.
102	*/
103	if (acpi_gbl_FADT.gpe0_block_length &&
104	acpi_gbl_FADT.xgpe0_block.address) {
105
106	/* GPE block 0 exists (has both length and address > 0) */
107
108	register_count0 = (u16)(acpi_gbl_FADT.gpe0_block_length / 2);
109
110	gpe_number_max =
111	(register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1;
112
113	/* Install GPE Block 0 */
114
115	status = acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
116	&acpi_gbl_FADT.xgpe0_block,
117	register_count0, 0,
118	acpi_gbl_FADT.sci_interrupt,
119	&acpi_gbl_gpe_fadt_blocks[0]);
120
121	if (ACPI_FAILURE(status)) {
122	ACPI_EXCEPTION((AE_INFO, status,
123	"Could not create GPE Block 0"));
124	}
125	}
126
127	if (acpi_gbl_FADT.gpe1_block_length &&
128	acpi_gbl_FADT.xgpe1_block.address) {
129
130	/* GPE block 1 exists (has both length and address > 0) */
131
132	register_count1 = (u16)(acpi_gbl_FADT.gpe1_block_length / 2);
133
134	/* Check for GPE0/GPE1 overlap (if both banks exist) */
135
136	if ((register_count0) &&
137	(gpe_number_max >= acpi_gbl_FADT.gpe1_base)) {
138	ACPI_ERROR((AE_INFO,
139	"GPE0 block (GPE 0 to %u) overlaps the GPE1 block "
140	"(GPE %u to %u) - Ignoring GPE1",
141	gpe_number_max, acpi_gbl_FADT.gpe1_base,
142	acpi_gbl_FADT.gpe1_base +
143	((register_count1 *
144	ACPI_GPE_REGISTER_WIDTH) - 1)));
145
146	/* Ignore GPE1 block by setting the register count to zero */
147
148	register_count1 = 0;
149	} else {
150	/* Install GPE Block 1 */
151
152	status =
153	acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
154	&acpi_gbl_FADT.xgpe1_block,
155	register_count1,
156	acpi_gbl_FADT.gpe1_base,
157	acpi_gbl_FADT.
158	sci_interrupt,
159	&acpi_gbl_gpe_fadt_blocks
160	[1]);
161
162	if (ACPI_FAILURE(status)) {
163	ACPI_EXCEPTION((AE_INFO, status,
164	"Could not create GPE Block 1"));
165	}
166
167	/*
168	* GPE0 and GPE1 do not have to be contiguous in the GPE number
169	* space. However, GPE0 always starts at GPE number zero.
170	*/
171	gpe_number_max = acpi_gbl_FADT.gpe1_base +
172	((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1);
173	}
174	}
175
176	/* Exit if there are no GPE registers */
177
178	if ((register_count0 + register_count1) == 0) {
179
180	/* GPEs are not required by ACPI, this is OK */
181
182	ACPI_DEBUG_PRINT((ACPI_DB_INIT,
183	"There are no GPE blocks defined in the FADT\n"));
184	status = AE_OK;
185	goto cleanup;
186	}
187
188	/* Check for Max GPE number out-of-range */
189
190	if (gpe_number_max > ACPI_GPE_MAX) {
191	ACPI_ERROR((AE_INFO,
192	"Maximum GPE number from FADT is too large: 0x%X",
193	gpe_number_max));
194	status = AE_BAD_VALUE;
195	goto cleanup;
196	}
197
198	cleanup:
199	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
200	return_ACPI_STATUS(AE_OK);
201	}
202
203	/*******************************************************************************
204	*
205	* FUNCTION: acpi_ev_update_gpes
206	*
207	* PARAMETERS: table_owner_id - ID of the newly-loaded ACPI table
208	*
209	* RETURN: None
210	*
211	* DESCRIPTION: Check for new GPE methods (_Lxx/_Exx) made available as a
212	* result of a Load() or load_table() operation. If new GPE
a2100801	213	* methods have been installed, register the new methods.
3fe50208 BM	214	*
	215	******************************************************************************/
	216
	217	void acpi_ev_update_gpes(acpi_owner_id table_owner_id)
	218	{
	219	struct acpi_gpe_xrupt_info *gpe_xrupt_info;
	220	struct acpi_gpe_block_info *gpe_block;
	221	struct acpi_gpe_walk_info walk_info;
	222	acpi_status status = AE_OK;
3fe50208 BM	223
	224	/*
	225	* 2) Find any _Lxx/_Exx GPE methods that have just been loaded.
	226	*
9874647b RW	227	* Any GPEs that correspond to new _Lxx/_Exx methods are immediately
9874647b RW	228	* enabled.
3fe50208 BM	229	*
	230	* Examine the namespace underneath each gpe_device within the
	231	* gpe_block lists.
	232	*/
	233	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
	234	if (ACPI_FAILURE(status)) {
	235	return;
	236	}
	237
9874647b RW	238	walk_info.owner_id = table_owner_id;
9874647b RW	239	walk_info.execute_by_owner_id = TRUE;
3fe50208	240	walk_info.count = 0;
3fe50208 BM	241
	242	/* Walk the interrupt level descriptor list */
	243
	244	gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
	245	while (gpe_xrupt_info) {
	246
	247	/* Walk all Gpe Blocks attached to this interrupt level */
	248
	249	gpe_block = gpe_xrupt_info->gpe_block_list_head;
	250	while (gpe_block) {
	251	walk_info.gpe_block = gpe_block;
	252	walk_info.gpe_device = gpe_block->node;
	253
	254	status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD,
	255	walk_info.gpe_device,
	256	ACPI_UINT32_MAX,
	257	ACPI_NS_WALK_NO_UNLOCK,
	258	acpi_ev_match_gpe_method,
	259	NULL, &walk_info, NULL);
	260	if (ACPI_FAILURE(status)) {
	261	ACPI_EXCEPTION((AE_INFO, status,
	262	"While decoding _Lxx/_Exx methods"));
	263	}
	264
	265	gpe_block = gpe_block->next;
	266	}
	267
	268	gpe_xrupt_info = gpe_xrupt_info->next;
	269	}
	270
9874647b RW	271	if (walk_info.count) {
9874647b RW	272	ACPI_INFO((AE_INFO, "Enabled %u new GPEs", walk_info.count));
3fe50208 BM	273	}
	274
	275	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
	276	return;
	277	}
	278
	279	/*******************************************************************************
	280	*
	281	* FUNCTION: acpi_ev_match_gpe_method
	282	*
	283	* PARAMETERS: Callback from walk_namespace
	284	*
	285	* RETURN: Status
	286	*
	287	* DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
	288	* control method under the _GPE portion of the namespace.
	289	* Extract the name and GPE type from the object, saving this
	290	* information for quick lookup during GPE dispatch. Allows a
	291	* per-owner_id evaluation if execute_by_owner_id is TRUE in the
	292	* walk_info parameter block.
	293	*
	294	* The name of each GPE control method is of the form:
	295	* "_Lxx" or "_Exx", where:
	296	* L - means that the GPE is level triggered
	297	* E - means that the GPE is edge triggered
	298	* xx - is the GPE number [in HEX]
	299	*
	300	* If walk_info->execute_by_owner_id is TRUE, we only execute examine GPE methods
	301	* with that owner.
3fe50208 BM	302	*
	303	******************************************************************************/
	304
	305	acpi_status
	306	acpi_ev_match_gpe_method(acpi_handle obj_handle,
	307	u32 level, void context, void *return_value)
	308	{
	309	struct acpi_namespace_node *method_node =
	310	ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
	311	struct acpi_gpe_walk_info *walk_info =
	312	ACPI_CAST_PTR(struct acpi_gpe_walk_info, context);
	313	struct acpi_gpe_event_info *gpe_event_info;
3fe50208 BM	314	u32 gpe_number;
	315	char name[ACPI_NAME_SIZE + 1];
	316	u8 type;
	317
	318	ACPI_FUNCTION_TRACE(ev_match_gpe_method);
	319
	320	/* Check if requested owner_id matches this owner_id */
	321
	322	if ((walk_info->execute_by_owner_id) &&
	323	(method_node->owner_id != walk_info->owner_id)) {
	324	return_ACPI_STATUS(AE_OK);
	325	}
	326
	327	/*
	328	* Match and decode the _Lxx and _Exx GPE method names
	329	*
	330	* 1) Extract the method name and null terminate it
	331	*/
	332	ACPI_MOVE_32_TO_32(name, &method_node->name.integer);
	333	name[ACPI_NAME_SIZE] = 0;
	334
	335	/* 2) Name must begin with an underscore */
	336
	337	if (name[0] != '_') {
	338	return_ACPI_STATUS(AE_OK); /* Ignore this method */
	339	}
	340
	341	/*
	342	* 3) Edge/Level determination is based on the 2nd character
	343	* of the method name
3fe50208 BM	344	*/
	345	switch (name[1]) {
	346	case 'L':
	347	type = ACPI_GPE_LEVEL_TRIGGERED;
	348	break;
	349
	350	case 'E':
	351	type = ACPI_GPE_EDGE_TRIGGERED;
	352	break;
	353
	354	default:
	355	/* Unknown method type, just ignore it */
	356
	357	ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
	358	"Ignoring unknown GPE method type: %s "
	359	"(name not of form _Lxx or _Exx)", name));
	360	return_ACPI_STATUS(AE_OK);
	361	}
	362
	363	/* 4) The last two characters of the name are the hex GPE Number */
	364
	365	gpe_number = ACPI_STRTOUL(&name[2], NULL, 16);
	366	if (gpe_number == ACPI_UINT32_MAX) {
	367
	368	/* Conversion failed; invalid method, just ignore it */
	369
	370	ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
	371	"Could not extract GPE number from name: %s "
	372	"(name is not of form _Lxx or _Exx)", name));
	373	return_ACPI_STATUS(AE_OK);
	374	}
	375
	376	/* Ensure that we have a valid GPE number for this GPE block */
	377
	378	gpe_event_info =
	379	acpi_ev_low_get_gpe_info(gpe_number, walk_info->gpe_block);
	380	if (!gpe_event_info) {
	381	/*
	382	* This gpe_number is not valid for this GPE block, just ignore it.
	383	* However, it may be valid for a different GPE block, since GPE0
	384	* and GPE1 methods both appear under \_GPE.
	385	*/
	386	return_ACPI_STATUS(AE_OK);
	387	}
	388
	389	if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
	390	ACPI_GPE_DISPATCH_HANDLER) {
	391
	392	/* If there is already a handler, ignore this GPE method */
	393
	394	return_ACPI_STATUS(AE_OK);
	395	}
	396
	397	if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
	398	ACPI_GPE_DISPATCH_METHOD) {
	399	/*
	400	* If there is already a method, ignore this method. But check
	401	* for a type mismatch (if both the _Lxx AND _Exx exist)
	402	*/
	403	if (type != (gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK)) {
	404	ACPI_ERROR((AE_INFO,
	405	"For GPE 0x%.2X, found both _L%2.2X and _E%2.2X methods",
	406	gpe_number, gpe_number, gpe_number));
	407	}
408	return_ACPI_STATUS(AE_OK);
409	}
410
411	/*
412	* Add the GPE information from above to the gpe_event_info block for
413	* use during dispatch of this GPE.
414	*/
415	gpe_event_info->flags \|= (u8)(type \| ACPI_GPE_DISPATCH_METHOD);
416	gpe_event_info->dispatch.method_node = method_node;
417
3fe50208 BM	418	ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
	419	"Registered GPE method %s as GPE number 0x%.2X\n",
	420	name, gpe_number));
	421	return_ACPI_STATUS(AE_OK);
	422	}