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/drivers/acpi/acpica/uteval.c

http://github.com/mirrors/linux
C | 315 lines | 152 code | 62 blank | 101 comment | 19 complexity | f3f4c640336791b1ebe78ca9a3862597 MD5 | raw file
  1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
  2/******************************************************************************
  3 *
  4 * Module Name: uteval - Object evaluation
  5 *
  6 * Copyright (C) 2000 - 2020, Intel Corp.
  7 *
  8 *****************************************************************************/
  9
 10#include <acpi/acpi.h>
 11#include "accommon.h"
 12#include "acnamesp.h"
 13
 14#define _COMPONENT          ACPI_UTILITIES
 15ACPI_MODULE_NAME("uteval")
 16
 17/*******************************************************************************
 18 *
 19 * FUNCTION:    acpi_ut_evaluate_object
 20 *
 21 * PARAMETERS:  prefix_node         - Starting node
 22 *              path                - Path to object from starting node
 23 *              expected_return_types - Bitmap of allowed return types
 24 *              return_desc         - Where a return value is stored
 25 *
 26 * RETURN:      Status
 27 *
 28 * DESCRIPTION: Evaluates a namespace object and verifies the type of the
 29 *              return object. Common code that simplifies accessing objects
 30 *              that have required return objects of fixed types.
 31 *
 32 *              NOTE: Internal function, no parameter validation
 33 *
 34 ******************************************************************************/
 35
 36acpi_status
 37acpi_ut_evaluate_object(struct acpi_namespace_node *prefix_node,
 38			const char *path,
 39			u32 expected_return_btypes,
 40			union acpi_operand_object **return_desc)
 41{
 42	struct acpi_evaluate_info *info;
 43	acpi_status status;
 44	u32 return_btype;
 45
 46	ACPI_FUNCTION_TRACE(ut_evaluate_object);
 47
 48	/* Allocate the evaluation information block */
 49
 50	info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
 51	if (!info) {
 52		return_ACPI_STATUS(AE_NO_MEMORY);
 53	}
 54
 55	info->prefix_node = prefix_node;
 56	info->relative_pathname = path;
 57
 58	/* Evaluate the object/method */
 59
 60	status = acpi_ns_evaluate(info);
 61	if (ACPI_FAILURE(status)) {
 62		if (status == AE_NOT_FOUND) {
 63			ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 64					  "[%4.4s.%s] was not found\n",
 65					  acpi_ut_get_node_name(prefix_node),
 66					  path));
 67		} else {
 68			ACPI_ERROR_METHOD("Method execution failed",
 69					  prefix_node, path, status);
 70		}
 71
 72		goto cleanup;
 73	}
 74
 75	/* Did we get a return object? */
 76
 77	if (!info->return_object) {
 78		if (expected_return_btypes) {
 79			ACPI_ERROR_METHOD("No object was returned from",
 80					  prefix_node, path, AE_NOT_EXIST);
 81
 82			status = AE_NOT_EXIST;
 83		}
 84
 85		goto cleanup;
 86	}
 87
 88	/* Map the return object type to the bitmapped type */
 89
 90	switch ((info->return_object)->common.type) {
 91	case ACPI_TYPE_INTEGER:
 92
 93		return_btype = ACPI_BTYPE_INTEGER;
 94		break;
 95
 96	case ACPI_TYPE_BUFFER:
 97
 98		return_btype = ACPI_BTYPE_BUFFER;
 99		break;
100
101	case ACPI_TYPE_STRING:
102
103		return_btype = ACPI_BTYPE_STRING;
104		break;
105
106	case ACPI_TYPE_PACKAGE:
107
108		return_btype = ACPI_BTYPE_PACKAGE;
109		break;
110
111	default:
112
113		return_btype = 0;
114		break;
115	}
116
117	if ((acpi_gbl_enable_interpreter_slack) && (!expected_return_btypes)) {
118		/*
119		 * We received a return object, but one was not expected. This can
120		 * happen frequently if the "implicit return" feature is enabled.
121		 * Just delete the return object and return AE_OK.
122		 */
123		acpi_ut_remove_reference(info->return_object);
124		goto cleanup;
125	}
126
127	/* Is the return object one of the expected types? */
128
129	if (!(expected_return_btypes & return_btype)) {
130		ACPI_ERROR_METHOD("Return object type is incorrect",
131				  prefix_node, path, AE_TYPE);
132
133		ACPI_ERROR((AE_INFO,
134			    "Type returned from %s was incorrect: %s, expected Btypes: 0x%X",
135			    path,
136			    acpi_ut_get_object_type_name(info->return_object),
137			    expected_return_btypes));
138
139		/* On error exit, we must delete the return object */
140
141		acpi_ut_remove_reference(info->return_object);
142		status = AE_TYPE;
143		goto cleanup;
144	}
145
146	/* Object type is OK, return it */
147
148	*return_desc = info->return_object;
149
150cleanup:
151	ACPI_FREE(info);
152	return_ACPI_STATUS(status);
153}
154
155/*******************************************************************************
156 *
157 * FUNCTION:    acpi_ut_evaluate_numeric_object
158 *
159 * PARAMETERS:  object_name         - Object name to be evaluated
160 *              device_node         - Node for the device
161 *              value               - Where the value is returned
162 *
163 * RETURN:      Status
164 *
165 * DESCRIPTION: Evaluates a numeric namespace object for a selected device
166 *              and stores result in *Value.
167 *
168 *              NOTE: Internal function, no parameter validation
169 *
170 ******************************************************************************/
171
172acpi_status
173acpi_ut_evaluate_numeric_object(const char *object_name,
174				struct acpi_namespace_node *device_node,
175				u64 *value)
176{
177	union acpi_operand_object *obj_desc;
178	acpi_status status;
179
180	ACPI_FUNCTION_TRACE(ut_evaluate_numeric_object);
181
182	status = acpi_ut_evaluate_object(device_node, object_name,
183					 ACPI_BTYPE_INTEGER, &obj_desc);
184	if (ACPI_FAILURE(status)) {
185		return_ACPI_STATUS(status);
186	}
187
188	/* Get the returned Integer */
189
190	*value = obj_desc->integer.value;
191
192	/* On exit, we must delete the return object */
193
194	acpi_ut_remove_reference(obj_desc);
195	return_ACPI_STATUS(status);
196}
197
198/*******************************************************************************
199 *
200 * FUNCTION:    acpi_ut_execute_STA
201 *
202 * PARAMETERS:  device_node         - Node for the device
203 *              flags               - Where the status flags are returned
204 *
205 * RETURN:      Status
206 *
207 * DESCRIPTION: Executes _STA for selected device and stores results in
208 *              *Flags. If _STA does not exist, then the device is assumed
209 *              to be present/functional/enabled (as per the ACPI spec).
210 *
211 *              NOTE: Internal function, no parameter validation
212 *
213 ******************************************************************************/
214
215acpi_status
216acpi_ut_execute_STA(struct acpi_namespace_node *device_node, u32 * flags)
217{
218	union acpi_operand_object *obj_desc;
219	acpi_status status;
220
221	ACPI_FUNCTION_TRACE(ut_execute_STA);
222
223	status = acpi_ut_evaluate_object(device_node, METHOD_NAME__STA,
224					 ACPI_BTYPE_INTEGER, &obj_desc);
225	if (ACPI_FAILURE(status)) {
226		if (AE_NOT_FOUND == status) {
227			/*
228			 * if _STA does not exist, then (as per the ACPI specification),
229			 * the returned flags will indicate that the device is present,
230			 * functional, and enabled.
231			 */
232			ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
233					  "_STA on %4.4s was not found, assuming device is present\n",
234					  acpi_ut_get_node_name(device_node)));
235
236			*flags = ACPI_UINT32_MAX;
237			status = AE_OK;
238		}
239
240		return_ACPI_STATUS(status);
241	}
242
243	/* Extract the status flags */
244
245	*flags = (u32) obj_desc->integer.value;
246
247	/* On exit, we must delete the return object */
248
249	acpi_ut_remove_reference(obj_desc);
250	return_ACPI_STATUS(status);
251}
252
253/*******************************************************************************
254 *
255 * FUNCTION:    acpi_ut_execute_power_methods
256 *
257 * PARAMETERS:  device_node         - Node for the device
258 *              method_names        - Array of power method names
259 *              method_count        - Number of methods to execute
260 *              out_values          - Where the power method values are returned
261 *
262 * RETURN:      Status, out_values
263 *
264 * DESCRIPTION: Executes the specified power methods for the device and returns
265 *              the result(s).
266 *
267 *              NOTE: Internal function, no parameter validation
268 *
269******************************************************************************/
270
271acpi_status
272acpi_ut_execute_power_methods(struct acpi_namespace_node *device_node,
273			      const char **method_names,
274			      u8 method_count, u8 *out_values)
275{
276	union acpi_operand_object *obj_desc;
277	acpi_status status;
278	acpi_status final_status = AE_NOT_FOUND;
279	u32 i;
280
281	ACPI_FUNCTION_TRACE(ut_execute_power_methods);
282
283	for (i = 0; i < method_count; i++) {
284		/*
285		 * Execute the power method (_sx_d or _sx_w). The only allowable
286		 * return type is an Integer.
287		 */
288		status = acpi_ut_evaluate_object(device_node,
289						 ACPI_CAST_PTR(char,
290							       method_names[i]),
291						 ACPI_BTYPE_INTEGER, &obj_desc);
292		if (ACPI_SUCCESS(status)) {
293			out_values[i] = (u8)obj_desc->integer.value;
294
295			/* Delete the return object */
296
297			acpi_ut_remove_reference(obj_desc);
298			final_status = AE_OK;	/* At least one value is valid */
299			continue;
300		}
301
302		out_values[i] = ACPI_UINT8_MAX;
303		if (status == AE_NOT_FOUND) {
304			continue;	/* Ignore if not found */
305		}
306
307		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
308				  "Failed %s on Device %4.4s, %s\n",
309				  ACPI_CAST_PTR(char, method_names[i]),
310				  acpi_ut_get_node_name(device_node),
311				  acpi_format_exception(status)));
312	}
313
314	return_ACPI_STATUS(final_status);
315}