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/drivers/acpi/events/evxfregn.c

https://bitbucket.org/evzijst/gittest
C | 247 lines | 98 code | 53 blank | 96 comment | 12 complexity | 388dec82dca33d95259a68520cf24bd9 MD5 | raw file
  1/******************************************************************************
  2 *
  3 * Module Name: evxfregn - External Interfaces, ACPI Operation Regions and
  4 *                         Address Spaces.
  5 *
  6 *****************************************************************************/
  7
  8/*
  9 * Copyright (C) 2000 - 2005, R. Byron Moore
 10 * All rights reserved.
 11 *
 12 * Redistribution and use in source and binary forms, with or without
 13 * modification, are permitted provided that the following conditions
 14 * are met:
 15 * 1. Redistributions of source code must retain the above copyright
 16 *    notice, this list of conditions, and the following disclaimer,
 17 *    without modification.
 18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 19 *    substantially similar to the "NO WARRANTY" disclaimer below
 20 *    ("Disclaimer") and any redistribution must be conditioned upon
 21 *    including a substantially similar Disclaimer requirement for further
 22 *    binary redistribution.
 23 * 3. Neither the names of the above-listed copyright holders nor the names
 24 *    of any contributors may be used to endorse or promote products derived
 25 *    from this software without specific prior written permission.
 26 *
 27 * Alternatively, this software may be distributed under the terms of the
 28 * GNU General Public License ("GPL") version 2 as published by the Free
 29 * Software Foundation.
 30 *
 31 * NO WARRANTY
 32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 42 * POSSIBILITY OF SUCH DAMAGES.
 43 */
 44
 45#include <linux/module.h>
 46
 47#include <acpi/acpi.h>
 48#include <acpi/acnamesp.h>
 49#include <acpi/acevents.h>
 50
 51#define _COMPONENT          ACPI_EVENTS
 52	 ACPI_MODULE_NAME    ("evxfregn")
 53
 54
 55/*******************************************************************************
 56 *
 57 * FUNCTION:    acpi_install_address_space_handler
 58 *
 59 * PARAMETERS:  Device          - Handle for the device
 60 *              space_id        - The address space ID
 61 *              Handler         - Address of the handler
 62 *              Setup           - Address of the setup function
 63 *              Context         - Value passed to the handler on each access
 64 *
 65 * RETURN:      Status
 66 *
 67 * DESCRIPTION: Install a handler for all op_regions of a given space_id.
 68 *
 69 ******************************************************************************/
 70
 71acpi_status
 72acpi_install_address_space_handler (
 73	acpi_handle                     device,
 74	acpi_adr_space_type             space_id,
 75	acpi_adr_space_handler          handler,
 76	acpi_adr_space_setup            setup,
 77	void                            *context)
 78{
 79	struct acpi_namespace_node      *node;
 80	acpi_status                     status;
 81
 82
 83	ACPI_FUNCTION_TRACE ("acpi_install_address_space_handler");
 84
 85
 86	/* Parameter validation */
 87
 88	if (!device) {
 89		return_ACPI_STATUS (AE_BAD_PARAMETER);
 90	}
 91
 92	status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 93	if (ACPI_FAILURE (status)) {
 94		return_ACPI_STATUS (status);
 95	}
 96
 97	/* Convert and validate the device handle */
 98
 99	node = acpi_ns_map_handle_to_node (device);
100	if (!node) {
101		status = AE_BAD_PARAMETER;
102		goto unlock_and_exit;
103	}
104
105	/* Install the handler for all Regions for this Space ID */
106
107	status = acpi_ev_install_space_handler (node, space_id, handler, setup, context);
108	if (ACPI_FAILURE (status)) {
109		goto unlock_and_exit;
110	}
111
112	/* Run all _REG methods for this address space */
113
114	status = acpi_ev_execute_reg_methods (node, space_id);
115
116unlock_and_exit:
117	(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
118	return_ACPI_STATUS (status);
119}
120EXPORT_SYMBOL(acpi_install_address_space_handler);
121
122
123/*******************************************************************************
124 *
125 * FUNCTION:    acpi_remove_address_space_handler
126 *
127 * PARAMETERS:  Device          - Handle for the device
128 *              space_id        - The address space ID
129 *              Handler         - Address of the handler
130 *
131 * RETURN:      Status
132 *
133 * DESCRIPTION: Remove a previously installed handler.
134 *
135 ******************************************************************************/
136
137acpi_status
138acpi_remove_address_space_handler (
139	acpi_handle                     device,
140	acpi_adr_space_type             space_id,
141	acpi_adr_space_handler          handler)
142{
143	union acpi_operand_object       *obj_desc;
144	union acpi_operand_object       *handler_obj;
145	union acpi_operand_object       *region_obj;
146	union acpi_operand_object       **last_obj_ptr;
147	struct acpi_namespace_node      *node;
148	acpi_status                     status;
149
150
151	ACPI_FUNCTION_TRACE ("acpi_remove_address_space_handler");
152
153
154	/* Parameter validation */
155
156	if (!device) {
157		return_ACPI_STATUS (AE_BAD_PARAMETER);
158	}
159
160	status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
161	if (ACPI_FAILURE (status)) {
162		return_ACPI_STATUS (status);
163	}
164
165	/* Convert and validate the device handle */
166
167	node = acpi_ns_map_handle_to_node (device);
168	if (!node) {
169		status = AE_BAD_PARAMETER;
170		goto unlock_and_exit;
171	}
172
173	/* Make sure the internal object exists */
174
175	obj_desc = acpi_ns_get_attached_object (node);
176	if (!obj_desc) {
177		status = AE_NOT_EXIST;
178		goto unlock_and_exit;
179	}
180
181	/* Find the address handler the user requested */
182
183	handler_obj = obj_desc->device.handler;
184	last_obj_ptr = &obj_desc->device.handler;
185	while (handler_obj) {
186		/* We have a handler, see if user requested this one */
187
188		if (handler_obj->address_space.space_id == space_id) {
189			/* Matched space_id, first dereference this in the Regions */
190
191			ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
192				"Removing address handler %p(%p) for region %s on Device %p(%p)\n",
193				handler_obj, handler, acpi_ut_get_region_name (space_id),
194				node, obj_desc));
195
196			region_obj = handler_obj->address_space.region_list;
197
198			/* Walk the handler's region list */
199
200			while (region_obj) {
201				/*
202				 * First disassociate the handler from the region.
203				 *
204				 * NOTE: this doesn't mean that the region goes away
205				 * The region is just inaccessible as indicated to
206				 * the _REG method
207				 */
208				acpi_ev_detach_region (region_obj, TRUE);
209
210				/*
211				 * Walk the list: Just grab the head because the
212				 * detach_region removed the previous head.
213				 */
214				region_obj = handler_obj->address_space.region_list;
215
216			}
217
218			/* Remove this Handler object from the list */
219
220			*last_obj_ptr = handler_obj->address_space.next;
221
222			/* Now we can delete the handler object */
223
224			acpi_ut_remove_reference (handler_obj);
225			goto unlock_and_exit;
226		}
227
228		/* Walk the linked list of handlers */
229
230		last_obj_ptr = &handler_obj->address_space.next;
231		handler_obj = handler_obj->address_space.next;
232	}
233
234	/* The handler does not exist */
235
236	ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
237		"Unable to remove address handler %p for %s(%X), dev_node %p, obj %p\n",
238		handler, acpi_ut_get_region_name (space_id), space_id, node, obj_desc));
239
240	status = AE_NOT_EXIST;
241
242unlock_and_exit:
243	(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
244	return_ACPI_STATUS (status);
245}
246EXPORT_SYMBOL(acpi_remove_address_space_handler);
247