aboutsummaryrefslogtreecommitdiff
path: root/drivers/acpi/utils.c
blob: c9a49f4747e675707e67aeeaa708fec550f2a5bf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
/*
 *  acpi_utils.c - ACPI Utility Functions ($Revision: 10 $)
 *
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#include "internal.h"

#define _COMPONENT		ACPI_BUS_COMPONENT
ACPI_MODULE_NAME("utils");

/* --------------------------------------------------------------------------
                            Object Evaluation Helpers
   -------------------------------------------------------------------------- */
static void
acpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s)
{
#ifdef ACPI_DEBUG_OUTPUT
	char prefix[80] = {'\0'};
	struct acpi_buffer buffer = {sizeof(prefix), prefix};
	acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer);
	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluate [%s.%s]: %s\n",
		(char *) prefix, p, acpi_format_exception(s)));
#else
	return;
#endif
}

acpi_status
acpi_extract_package(union acpi_object *package,
		     struct acpi_buffer *format, struct acpi_buffer *buffer)
{
	u32 size_required = 0;
	u32 tail_offset = 0;
	char *format_string = NULL;
	u32 format_count = 0;
	u32 i = 0;
	u8 *head = NULL;
	u8 *tail = NULL;


	if (!package || (package->type != ACPI_TYPE_PACKAGE)
	    || (package->package.count < 1)) {
		printk(KERN_WARNING PREFIX "Invalid package argument\n");
		return AE_BAD_PARAMETER;
	}

	if (!format || !format->pointer || (format->length < 1)) {
		printk(KERN_WARNING PREFIX "Invalid format argument\n");
		return AE_BAD_PARAMETER;
	}

	if (!buffer) {
		printk(KERN_WARNING PREFIX "Invalid buffer argument\n");
		return AE_BAD_PARAMETER;
	}

	format_count = (format->length / sizeof(char)) - 1;
	if (format_count > package->package.count) {
		printk(KERN_WARNING PREFIX "Format specifies more objects [%d]"
			      " than exist in package [%d].\n",
			      format_count, package->package.count);
		return AE_BAD_DATA;
	}

	format_string = format->pointer;

	/*
	 * Calculate size_required.
	 */
	for (i = 0; i < format_count; i++) {

		union acpi_object *element = &(package->package.elements[i]);

		if (!element) {
			return AE_BAD_DATA;
		}

		switch (element->type) {

		case ACPI_TYPE_INTEGER:
			switch (format_string[i]) {
			case 'N':
				size_required += sizeof(u64);
				tail_offset += sizeof(u64);
				break;
			case 'S':
				size_required +=
				    sizeof(char *) + sizeof(u64) +
				    sizeof(char);
				tail_offset += sizeof(char *);
				break;
			default:
				printk(KERN_WARNING PREFIX "Invalid package element"
					      " [%d]: got number, expecing"
					      " [%c]\n",
					      i, format_string[i]);
				return AE_BAD_DATA;
				break;
			}
			break;

		case ACPI_TYPE_STRING:
		case ACPI_TYPE_BUFFER:
			switch (format_string[i]) {
			case 'S':
				size_required +=
				    sizeof(char *) +
				    (element->string.length * sizeof(char)) +
				    sizeof(char);
				tail_offset += sizeof(char *);
				break;
			case 'B':
				size_required +=
				    sizeof(u8 *) +
				    (element->buffer.length * sizeof(u8));
				tail_offset += sizeof(u8 *);
				break;
			default:
				printk(KERN_WARNING PREFIX "Invalid package element"
					      " [%d] got string/buffer,"
					      " expecing [%c]\n",
					      i, format_string[i]);
				return AE_BAD_DATA;
				break;
			}
			break;

		case ACPI_TYPE_PACKAGE:
		default:
			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
					  "Found unsupported element at index=%d\n",
					  i));
			/* TBD: handle nested packages... */
			return AE_SUPPORT;
			break;
		}
	}

	/*
	 * Validate output buffer.
	 */
	if (buffer->length < size_required) {
		buffer->length = size_required;
		return AE_BUFFER_OVERFLOW;
	} else if (buffer->length != size_required || !buffer->pointer) {
		return AE_BAD_PARAMETER;
	}

	head = buffer->pointer;
	tail = buffer->pointer + tail_offset;

	/*
	 * Extract package data.
	 */
	for (i = 0; i < format_count; i++) {

		u8 **pointer = NULL;
		union acpi_object *element = &(package->package.elements[i]);

		if (!element) {
			return AE_BAD_DATA;
		}

		switch (element->type) {

		case ACPI_TYPE_INTEGER:
			switch (format_string[i]) {
			case 'N':
				*((u64 *) head) =
				    element->integer.value;
				head += sizeof(u64);
				break;
			case 'S':
				pointer = (u8 **) head;
				*pointer = tail;
				*((u64 *) tail) =
				    element->integer.value;
				head += sizeof(u64 *);
				tail += sizeof(u64);
				/* NULL terminate string */
				*tail = (char)0;
				tail += sizeof(char);
				break;
			default:
				/* Should never get here */
				break;
			}
			break;

		case ACPI_TYPE_STRING:
		case ACPI_TYPE_BUFFER:
			switch (format_string[i]) {
			case 'S':
				pointer = (u8 **) head;
				*pointer = tail;
				memcpy(tail, element->string.pointer,
				       element->string.length);
				head += sizeof(char *);
				tail += element->string.length * sizeof(char);
				/* NULL terminate string */
				*tail = (char)0;
				tail += sizeof(char);
				break;
			case 'B':
				pointer = (u8 **) head;
				*pointer = tail;
				memcpy(tail, element->buffer.pointer,
				       element->buffer.length);
				head += sizeof(u8 *);
				tail += element->buffer.length * sizeof(u8);
				break;
			default:
				/* Should never get here */
				break;
			}
			break;

		case ACPI_TYPE_PACKAGE:
			/* TBD: handle nested packages... */
		default:
			/* Should never get here */
			break;
		}
	}

	return AE_OK;
}

EXPORT_SYMBOL(acpi_extract_package);

acpi_status
acpi_evaluate_integer(acpi_handle handle,
		      acpi_string pathname,
		      struct acpi_object_list *arguments, unsigned long long *data)
{
	acpi_status status = AE_OK;
	union acpi_object element;
	struct acpi_buffer buffer = { 0, NULL };

	if (!data)
		return AE_BAD_PARAMETER;

	buffer.length = sizeof(union acpi_object);
	buffer.pointer = &element;
	status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
	if (ACPI_FAILURE(status)) {
		acpi_util_eval_error(handle, pathname, status);
		return status;
	}

	if (element.type != ACPI_TYPE_INTEGER) {
		acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
		return AE_BAD_DATA;
	}

	*data = element.integer.value;

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%llu]\n", *data));

	return AE_OK;
}

EXPORT_SYMBOL(acpi_evaluate_integer);

acpi_status
acpi_evaluate_reference(acpi_handle handle,
			acpi_string pathname,
			struct acpi_object_list *arguments,
			struct acpi_handle_list *list)
{
	acpi_status status = AE_OK;
	union acpi_object *package = NULL;
	union acpi_object *element = NULL;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	u32 i = 0;


	if (!list) {
		return AE_BAD_PARAMETER;
	}

	/* Evaluate object. */

	status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
	if (ACPI_FAILURE(status))
		goto end;

	package = buffer.pointer;

	if ((buffer.length == 0) || !package) {
		printk(KERN_ERR PREFIX "No return object (len %X ptr %p)\n",
			    (unsigned)buffer.length, package);
		status = AE_BAD_DATA;
		acpi_util_eval_error(handle, pathname, status);
		goto end;
	}
	if (package->type != ACPI_TYPE_PACKAGE) {
		printk(KERN_ERR PREFIX "Expecting a [Package], found type %X\n",
			    package->type);
		status = AE_BAD_DATA;
		acpi_util_eval_error(handle, pathname, status);
		goto end;
	}
	if (!package->package.count) {
		printk(KERN_ERR PREFIX "[Package] has zero elements (%p)\n",
			    package);
		status = AE_BAD_DATA;
		acpi_util_eval_error(handle, pathname, status);
		goto end;
	}

	if (package->package.count > ACPI_MAX_HANDLES) {
		return AE_NO_MEMORY;
	}
	list->count = package->package.count;

	/* Extract package data. */

	for (i = 0; i < list->count; i++) {

		element = &(package->package.elements[i]);

		if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
			status = AE_BAD_DATA;
			printk(KERN_ERR PREFIX
				    "Expecting a [Reference] package element, found type %X\n",
				    element->type);
			acpi_util_eval_error(handle, pathname, status);
			break;
		}

		if (!element->reference.handle) {
			printk(KERN_WARNING PREFIX "Invalid reference in"
			       " package %s\n", pathname);
			status = AE_NULL_ENTRY;
			break;
		}
		/* Get the  acpi_handle. */

		list->handles[i] = element->reference.handle;
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found reference [%p]\n",
				  list->handles[i]));
	}

      end:
	if (ACPI_FAILURE(status)) {
		list->count = 0;
		//kfree(list->handles);
	}

	kfree(buffer.pointer);

	return status;
}

EXPORT_SYMBOL(acpi_evaluate_reference);