Merge branches 'pm-cpufreq', 'pm-cpuidle', 'pm-devfreq', 'pm-opp' and 'pm-tools'
[linux-drm-fsl-dcu.git] / drivers / acpi / acpica / nsconvert.c
1 /******************************************************************************
2  *
3  * Module Name: nsconvert - Object conversions for objects returned by
4  *                          predefined methods
5  *
6  *****************************************************************************/
7
8 /*
9  * Copyright (C) 2000 - 2015, Intel Corp.
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 <acpi/acpi.h>
46 #include "accommon.h"
47 #include "acnamesp.h"
48 #include "acinterp.h"
49 #include "acpredef.h"
50 #include "amlresrc.h"
51
52 #define _COMPONENT          ACPI_NAMESPACE
53 ACPI_MODULE_NAME("nsconvert")
54
55 /*******************************************************************************
56  *
57  * FUNCTION:    acpi_ns_convert_to_integer
58  *
59  * PARAMETERS:  original_object     - Object to be converted
60  *              return_object       - Where the new converted object is returned
61  *
62  * RETURN:      Status. AE_OK if conversion was successful.
63  *
64  * DESCRIPTION: Attempt to convert a String/Buffer object to an Integer.
65  *
66  ******************************************************************************/
67 acpi_status
68 acpi_ns_convert_to_integer(union acpi_operand_object *original_object,
69                            union acpi_operand_object **return_object)
70 {
71         union acpi_operand_object *new_object;
72         acpi_status status;
73         u64 value = 0;
74         u32 i;
75
76         switch (original_object->common.type) {
77         case ACPI_TYPE_STRING:
78
79                 /* String-to-Integer conversion */
80
81                 status = acpi_ut_strtoul64(original_object->string.pointer,
82                                            ACPI_ANY_BASE, &value);
83                 if (ACPI_FAILURE(status)) {
84                         return (status);
85                 }
86                 break;
87
88         case ACPI_TYPE_BUFFER:
89
90                 /* Buffer-to-Integer conversion. Max buffer size is 64 bits. */
91
92                 if (original_object->buffer.length > 8) {
93                         return (AE_AML_OPERAND_TYPE);
94                 }
95
96                 /* Extract each buffer byte to create the integer */
97
98                 for (i = 0; i < original_object->buffer.length; i++) {
99                         value |=
100                             ((u64)original_object->buffer.
101                              pointer[i] << (i * 8));
102                 }
103                 break;
104
105         default:
106
107                 return (AE_AML_OPERAND_TYPE);
108         }
109
110         new_object = acpi_ut_create_integer_object(value);
111         if (!new_object) {
112                 return (AE_NO_MEMORY);
113         }
114
115         *return_object = new_object;
116         return (AE_OK);
117 }
118
119 /*******************************************************************************
120  *
121  * FUNCTION:    acpi_ns_convert_to_string
122  *
123  * PARAMETERS:  original_object     - Object to be converted
124  *              return_object       - Where the new converted object is returned
125  *
126  * RETURN:      Status. AE_OK if conversion was successful.
127  *
128  * DESCRIPTION: Attempt to convert a Integer/Buffer object to a String.
129  *
130  ******************************************************************************/
131
132 acpi_status
133 acpi_ns_convert_to_string(union acpi_operand_object *original_object,
134                           union acpi_operand_object **return_object)
135 {
136         union acpi_operand_object *new_object;
137         acpi_size length;
138         acpi_status status;
139
140         switch (original_object->common.type) {
141         case ACPI_TYPE_INTEGER:
142                 /*
143                  * Integer-to-String conversion. Commonly, convert
144                  * an integer of value 0 to a NULL string. The last element of
145                  * _BIF and _BIX packages occasionally need this fix.
146                  */
147                 if (original_object->integer.value == 0) {
148
149                         /* Allocate a new NULL string object */
150
151                         new_object = acpi_ut_create_string_object(0);
152                         if (!new_object) {
153                                 return (AE_NO_MEMORY);
154                         }
155                 } else {
156                         status =
157                             acpi_ex_convert_to_string(original_object,
158                                                       &new_object,
159                                                       ACPI_IMPLICIT_CONVERT_HEX);
160                         if (ACPI_FAILURE(status)) {
161                                 return (status);
162                         }
163                 }
164                 break;
165
166         case ACPI_TYPE_BUFFER:
167                 /*
168                  * Buffer-to-String conversion. Use a to_string
169                  * conversion, no transform performed on the buffer data. The best
170                  * example of this is the _BIF method, where the string data from
171                  * the battery is often (incorrectly) returned as buffer object(s).
172                  */
173                 length = 0;
174                 while ((length < original_object->buffer.length) &&
175                        (original_object->buffer.pointer[length])) {
176                         length++;
177                 }
178
179                 /* Allocate a new string object */
180
181                 new_object = acpi_ut_create_string_object(length);
182                 if (!new_object) {
183                         return (AE_NO_MEMORY);
184                 }
185
186                 /*
187                  * Copy the raw buffer data with no transform. String is already NULL
188                  * terminated at Length+1.
189                  */
190                 ACPI_MEMCPY(new_object->string.pointer,
191                             original_object->buffer.pointer, length);
192                 break;
193
194         default:
195
196                 return (AE_AML_OPERAND_TYPE);
197         }
198
199         *return_object = new_object;
200         return (AE_OK);
201 }
202
203 /*******************************************************************************
204  *
205  * FUNCTION:    acpi_ns_convert_to_buffer
206  *
207  * PARAMETERS:  original_object     - Object to be converted
208  *              return_object       - Where the new converted object is returned
209  *
210  * RETURN:      Status. AE_OK if conversion was successful.
211  *
212  * DESCRIPTION: Attempt to convert a Integer/String/Package object to a Buffer.
213  *
214  ******************************************************************************/
215
216 acpi_status
217 acpi_ns_convert_to_buffer(union acpi_operand_object *original_object,
218                           union acpi_operand_object **return_object)
219 {
220         union acpi_operand_object *new_object;
221         acpi_status status;
222         union acpi_operand_object **elements;
223         u32 *dword_buffer;
224         u32 count;
225         u32 i;
226
227         switch (original_object->common.type) {
228         case ACPI_TYPE_INTEGER:
229                 /*
230                  * Integer-to-Buffer conversion.
231                  * Convert the Integer to a packed-byte buffer. _MAT and other
232                  * objects need this sometimes, if a read has been performed on a
233                  * Field object that is less than or equal to the global integer
234                  * size (32 or 64 bits).
235                  */
236                 status =
237                     acpi_ex_convert_to_buffer(original_object, &new_object);
238                 if (ACPI_FAILURE(status)) {
239                         return (status);
240                 }
241                 break;
242
243         case ACPI_TYPE_STRING:
244
245                 /* String-to-Buffer conversion. Simple data copy */
246
247                 new_object =
248                     acpi_ut_create_buffer_object(original_object->string.
249                                                  length);
250                 if (!new_object) {
251                         return (AE_NO_MEMORY);
252                 }
253
254                 ACPI_MEMCPY(new_object->buffer.pointer,
255                             original_object->string.pointer,
256                             original_object->string.length);
257                 break;
258
259         case ACPI_TYPE_PACKAGE:
260                 /*
261                  * This case is often seen for predefined names that must return a
262                  * Buffer object with multiple DWORD integers within. For example,
263                  * _FDE and _GTM. The Package can be converted to a Buffer.
264                  */
265
266                 /* All elements of the Package must be integers */
267
268                 elements = original_object->package.elements;
269                 count = original_object->package.count;
270
271                 for (i = 0; i < count; i++) {
272                         if ((!*elements) ||
273                             ((*elements)->common.type != ACPI_TYPE_INTEGER)) {
274                                 return (AE_AML_OPERAND_TYPE);
275                         }
276                         elements++;
277                 }
278
279                 /* Create the new buffer object to replace the Package */
280
281                 new_object = acpi_ut_create_buffer_object(ACPI_MUL_4(count));
282                 if (!new_object) {
283                         return (AE_NO_MEMORY);
284                 }
285
286                 /* Copy the package elements (integers) to the buffer as DWORDs */
287
288                 elements = original_object->package.elements;
289                 dword_buffer = ACPI_CAST_PTR(u32, new_object->buffer.pointer);
290
291                 for (i = 0; i < count; i++) {
292                         *dword_buffer = (u32)(*elements)->integer.value;
293                         dword_buffer++;
294                         elements++;
295                 }
296                 break;
297
298         default:
299
300                 return (AE_AML_OPERAND_TYPE);
301         }
302
303         *return_object = new_object;
304         return (AE_OK);
305 }
306
307 /*******************************************************************************
308  *
309  * FUNCTION:    acpi_ns_convert_to_unicode
310  *
311  * PARAMETERS:  original_object     - ASCII String Object to be converted
312  *              return_object       - Where the new converted object is returned
313  *
314  * RETURN:      Status. AE_OK if conversion was successful.
315  *
316  * DESCRIPTION: Attempt to convert a String object to a Unicode string Buffer.
317  *
318  ******************************************************************************/
319
320 acpi_status
321 acpi_ns_convert_to_unicode(union acpi_operand_object *original_object,
322                            union acpi_operand_object **return_object)
323 {
324         union acpi_operand_object *new_object;
325         char *ascii_string;
326         u16 *unicode_buffer;
327         u32 unicode_length;
328         u32 i;
329
330         if (!original_object) {
331                 return (AE_OK);
332         }
333
334         /* If a Buffer was returned, it must be at least two bytes long */
335
336         if (original_object->common.type == ACPI_TYPE_BUFFER) {
337                 if (original_object->buffer.length < 2) {
338                         return (AE_AML_OPERAND_VALUE);
339                 }
340
341                 *return_object = NULL;
342                 return (AE_OK);
343         }
344
345         /*
346          * The original object is an ASCII string. Convert this string to
347          * a unicode buffer.
348          */
349         ascii_string = original_object->string.pointer;
350         unicode_length = (original_object->string.length * 2) + 2;
351
352         /* Create a new buffer object for the Unicode data */
353
354         new_object = acpi_ut_create_buffer_object(unicode_length);
355         if (!new_object) {
356                 return (AE_NO_MEMORY);
357         }
358
359         unicode_buffer = ACPI_CAST_PTR(u16, new_object->buffer.pointer);
360
361         /* Convert ASCII to Unicode */
362
363         for (i = 0; i < original_object->string.length; i++) {
364                 unicode_buffer[i] = (u16)ascii_string[i];
365         }
366
367         *return_object = new_object;
368         return (AE_OK);
369 }
370
371 /*******************************************************************************
372  *
373  * FUNCTION:    acpi_ns_convert_to_resource
374  *
375  * PARAMETERS:  original_object     - Object to be converted
376  *              return_object       - Where the new converted object is returned
377  *
378  * RETURN:      Status. AE_OK if conversion was successful
379  *
380  * DESCRIPTION: Attempt to convert a Integer object to a resource_template
381  *              Buffer.
382  *
383  ******************************************************************************/
384
385 acpi_status
386 acpi_ns_convert_to_resource(union acpi_operand_object *original_object,
387                             union acpi_operand_object **return_object)
388 {
389         union acpi_operand_object *new_object;
390         u8 *buffer;
391
392         /*
393          * We can fix the following cases for an expected resource template:
394          * 1. No return value (interpreter slack mode is disabled)
395          * 2. A "Return (Zero)" statement
396          * 3. A "Return empty buffer" statement
397          *
398          * We will return a buffer containing a single end_tag
399          * resource descriptor.
400          */
401         if (original_object) {
402                 switch (original_object->common.type) {
403                 case ACPI_TYPE_INTEGER:
404
405                         /* We can only repair an Integer==0 */
406
407                         if (original_object->integer.value) {
408                                 return (AE_AML_OPERAND_TYPE);
409                         }
410                         break;
411
412                 case ACPI_TYPE_BUFFER:
413
414                         if (original_object->buffer.length) {
415
416                                 /* Additional checks can be added in the future */
417
418                                 *return_object = NULL;
419                                 return (AE_OK);
420                         }
421                         break;
422
423                 case ACPI_TYPE_STRING:
424                 default:
425
426                         return (AE_AML_OPERAND_TYPE);
427                 }
428         }
429
430         /* Create the new buffer object for the resource descriptor */
431
432         new_object = acpi_ut_create_buffer_object(2);
433         if (!new_object) {
434                 return (AE_NO_MEMORY);
435         }
436
437         buffer = ACPI_CAST_PTR(u8, new_object->buffer.pointer);
438
439         /* Initialize the Buffer with a single end_tag descriptor */
440
441         buffer[0] = (ACPI_RESOURCE_NAME_END_TAG | ASL_RDESC_END_TAG_SIZE);
442         buffer[1] = 0x00;
443
444         *return_object = new_object;
445         return (AE_OK);
446 }