Commit | Line | Data |
---|---|---|
7db5d82d BM |
1 | |
2 | /****************************************************************************** | |
3 | * | |
4 | * Module Name: hwxface - Public ACPICA hardware interfaces | |
5 | * | |
6 | *****************************************************************************/ | |
7 | ||
8 | /* | |
77848130 | 9 | * Copyright (C) 2000 - 2012, Intel Corp. |
7db5d82d BM |
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 | ||
214f2c90 | 45 | #include <linux/export.h> |
7db5d82d | 46 | #include <acpi/acpi.h> |
e2f7a777 LB |
47 | #include "accommon.h" |
48 | #include "acnamesp.h" | |
7db5d82d BM |
49 | |
50 | #define _COMPONENT ACPI_HARDWARE | |
51 | ACPI_MODULE_NAME("hwxface") | |
52 | ||
d3fd902d BM |
53 | /****************************************************************************** |
54 | * | |
55 | * FUNCTION: acpi_reset | |
56 | * | |
57 | * PARAMETERS: None | |
58 | * | |
59 | * RETURN: Status | |
60 | * | |
61 | * DESCRIPTION: Set reset register in memory or IO space. Note: Does not | |
62 | * support reset register in PCI config space, this must be | |
63 | * handled separately. | |
64 | * | |
65 | ******************************************************************************/ | |
66 | acpi_status acpi_reset(void) | |
67 | { | |
68 | struct acpi_generic_address *reset_reg; | |
69 | acpi_status status; | |
70 | ||
71 | ACPI_FUNCTION_TRACE(acpi_reset); | |
72 | ||
73 | reset_reg = &acpi_gbl_FADT.reset_register; | |
74 | ||
75 | /* Check if the reset register is supported */ | |
76 | ||
19244ad0 LT |
77 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) || |
78 | !reset_reg->address) { | |
d3fd902d BM |
79 | return_ACPI_STATUS(AE_NOT_EXIST); |
80 | } | |
81 | ||
8a964236 BM |
82 | if (reset_reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) { |
83 | /* | |
f17d9cbf MG |
84 | * For I/O space, write directly to the OSL. This |
85 | * bypasses the port validation mechanism, which may | |
86 | * block a valid write to the reset register. Spec | |
87 | * section 4.7.3.6 requires register width to be 8. | |
8a964236 BM |
88 | */ |
89 | status = | |
90 | acpi_os_write_port((acpi_io_address) reset_reg->address, | |
f17d9cbf | 91 | acpi_gbl_FADT.reset_value, 8); |
8a964236 BM |
92 | } else { |
93 | /* Write the reset value to the reset register */ | |
94 | ||
95 | status = acpi_hw_write(acpi_gbl_FADT.reset_value, reset_reg); | |
96 | } | |
d3fd902d | 97 | |
d3fd902d BM |
98 | return_ACPI_STATUS(status); |
99 | } | |
100 | ||
101 | ACPI_EXPORT_SYMBOL(acpi_reset) | |
102 | ||
7db5d82d BM |
103 | /****************************************************************************** |
104 | * | |
105 | * FUNCTION: acpi_read | |
106 | * | |
ba494bee BM |
107 | * PARAMETERS: value - Where the value is returned |
108 | * reg - GAS register structure | |
7db5d82d BM |
109 | * |
110 | * RETURN: Status | |
111 | * | |
112 | * DESCRIPTION: Read from either memory or IO space. | |
113 | * | |
c6b5774c BM |
114 | * LIMITATIONS: <These limitations also apply to acpi_write> |
115 | * bit_width must be exactly 8, 16, 32, or 64. | |
ba494bee | 116 | * space_ID must be system_memory or system_IO. |
c6b5774c BM |
117 | * bit_offset and access_width are currently ignored, as there has |
118 | * not been a need to implement these. | |
119 | * | |
7db5d82d | 120 | ******************************************************************************/ |
c6b5774c | 121 | acpi_status acpi_read(u64 *return_value, struct acpi_generic_address *reg) |
7db5d82d | 122 | { |
c6b5774c | 123 | u32 value; |
7db5d82d BM |
124 | u32 width; |
125 | u64 address; | |
126 | acpi_status status; | |
127 | ||
128 | ACPI_FUNCTION_NAME(acpi_read); | |
129 | ||
c6b5774c | 130 | if (!return_value) { |
ac0c8450 | 131 | return (AE_BAD_PARAMETER); |
7db5d82d BM |
132 | } |
133 | ||
c6b5774c | 134 | /* Validate contents of the GAS register. Allow 64-bit transfers */ |
7db5d82d | 135 | |
c6b5774c BM |
136 | status = acpi_hw_validate_register(reg, 64, &address); |
137 | if (ACPI_FAILURE(status)) { | |
138 | return (status); | |
7db5d82d BM |
139 | } |
140 | ||
c6b5774c | 141 | /* Initialize entire 64-bit return value to zero */ |
7db5d82d | 142 | |
c6b5774c BM |
143 | *return_value = 0; |
144 | value = 0; | |
7db5d82d BM |
145 | |
146 | /* | |
88dcb04a BM |
147 | * Two address spaces supported: Memory or IO. PCI_Config is |
148 | * not supported here because the GAS structure is insufficient | |
7db5d82d | 149 | */ |
c6b5774c BM |
150 | if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) { |
151 | status = acpi_os_read_memory((acpi_physical_address) | |
653f4b53 BM |
152 | address, return_value, |
153 | reg->bit_width); | |
c6b5774c BM |
154 | if (ACPI_FAILURE(status)) { |
155 | return (status); | |
156 | } | |
653f4b53 | 157 | } else { /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */ |
c6b5774c | 158 | |
653f4b53 BM |
159 | width = reg->bit_width; |
160 | if (width == 64) { | |
161 | width = 32; /* Break into two 32-bit transfers */ | |
c6b5774c | 162 | } |
c6b5774c BM |
163 | |
164 | status = acpi_hw_read_port((acpi_io_address) | |
165 | address, &value, width); | |
166 | if (ACPI_FAILURE(status)) { | |
167 | return (status); | |
168 | } | |
169 | *return_value = value; | |
170 | ||
171 | if (reg->bit_width == 64) { | |
172 | ||
173 | /* Read the top 32 bits */ | |
174 | ||
175 | status = acpi_hw_read_port((acpi_io_address) | |
176 | (address + 4), &value, 32); | |
177 | if (ACPI_FAILURE(status)) { | |
178 | return (status); | |
179 | } | |
180 | *return_value |= ((u64)value << 32); | |
181 | } | |
7db5d82d BM |
182 | } |
183 | ||
184 | ACPI_DEBUG_PRINT((ACPI_DB_IO, | |
c6b5774c BM |
185 | "Read: %8.8X%8.8X width %2d from %8.8X%8.8X (%s)\n", |
186 | ACPI_FORMAT_UINT64(*return_value), reg->bit_width, | |
187 | ACPI_FORMAT_UINT64(address), | |
7db5d82d BM |
188 | acpi_ut_get_region_name(reg->space_id))); |
189 | ||
190 | return (status); | |
191 | } | |
192 | ||
193 | ACPI_EXPORT_SYMBOL(acpi_read) | |
194 | ||
195 | /****************************************************************************** | |
196 | * | |
197 | * FUNCTION: acpi_write | |
198 | * | |
ba494bee BM |
199 | * PARAMETERS: value - Value to be written |
200 | * reg - GAS register structure | |
7db5d82d BM |
201 | * |
202 | * RETURN: Status | |
203 | * | |
204 | * DESCRIPTION: Write to either memory or IO space. | |
205 | * | |
206 | ******************************************************************************/ | |
c6b5774c | 207 | acpi_status acpi_write(u64 value, struct acpi_generic_address *reg) |
7db5d82d BM |
208 | { |
209 | u32 width; | |
210 | u64 address; | |
211 | acpi_status status; | |
212 | ||
213 | ACPI_FUNCTION_NAME(acpi_write); | |
214 | ||
c6b5774c | 215 | /* Validate contents of the GAS register. Allow 64-bit transfers */ |
7db5d82d | 216 | |
c6b5774c BM |
217 | status = acpi_hw_validate_register(reg, 64, &address); |
218 | if (ACPI_FAILURE(status)) { | |
219 | return (status); | |
7db5d82d BM |
220 | } |
221 | ||
7db5d82d | 222 | /* |
c6b5774c BM |
223 | * Two address spaces supported: Memory or IO. PCI_Config is |
224 | * not supported here because the GAS structure is insufficient | |
7db5d82d | 225 | */ |
c6b5774c BM |
226 | if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) { |
227 | status = acpi_os_write_memory((acpi_physical_address) | |
653f4b53 | 228 | address, value, reg->bit_width); |
c6b5774c BM |
229 | if (ACPI_FAILURE(status)) { |
230 | return (status); | |
231 | } | |
653f4b53 | 232 | } else { /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */ |
c6b5774c | 233 | |
653f4b53 BM |
234 | width = reg->bit_width; |
235 | if (width == 64) { | |
236 | width = 32; /* Break into two 32-bit transfers */ | |
c6b5774c | 237 | } |
c6b5774c BM |
238 | |
239 | status = acpi_hw_write_port((acpi_io_address) | |
240 | address, ACPI_LODWORD(value), | |
7db5d82d | 241 | width); |
c6b5774c BM |
242 | if (ACPI_FAILURE(status)) { |
243 | return (status); | |
244 | } | |
245 | ||
246 | if (reg->bit_width == 64) { | |
247 | status = acpi_hw_write_port((acpi_io_address) | |
248 | (address + 4), | |
249 | ACPI_HIDWORD(value), 32); | |
250 | if (ACPI_FAILURE(status)) { | |
251 | return (status); | |
252 | } | |
253 | } | |
7db5d82d BM |
254 | } |
255 | ||
256 | ACPI_DEBUG_PRINT((ACPI_DB_IO, | |
c6b5774c BM |
257 | "Wrote: %8.8X%8.8X width %2d to %8.8X%8.8X (%s)\n", |
258 | ACPI_FORMAT_UINT64(value), reg->bit_width, | |
259 | ACPI_FORMAT_UINT64(address), | |
7db5d82d BM |
260 | acpi_ut_get_region_name(reg->space_id))); |
261 | ||
262 | return (status); | |
263 | } | |
264 | ||
265 | ACPI_EXPORT_SYMBOL(acpi_write) | |
266 | ||
33620c54 | 267 | #if (!ACPI_REDUCED_HARDWARE) |
7db5d82d BM |
268 | /******************************************************************************* |
269 | * | |
50ffba1b | 270 | * FUNCTION: acpi_read_bit_register |
7db5d82d | 271 | * |
9892dd23 BM |
272 | * PARAMETERS: register_id - ID of ACPI Bit Register to access |
273 | * return_value - Value that was read from the register, | |
274 | * normalized to bit position zero. | |
7db5d82d | 275 | * |
9892dd23 | 276 | * RETURN: Status and the value read from the specified Register. Value |
7db5d82d BM |
277 | * returned is normalized to bit0 (is shifted all the way right) |
278 | * | |
279 | * DESCRIPTION: ACPI bit_register read function. Does not acquire the HW lock. | |
280 | * | |
9892dd23 BM |
281 | * SUPPORTS: Bit fields in PM1 Status, PM1 Enable, PM1 Control, and |
282 | * PM2 Control. | |
283 | * | |
284 | * Note: The hardware lock is not required when reading the ACPI bit registers | |
285 | * since almost all of them are single bit and it does not matter that | |
286 | * the parent hardware register can be split across two physical | |
287 | * registers. The only multi-bit field is SLP_TYP in the PM1 control | |
288 | * register, but this field does not cross an 8-bit boundary (nor does | |
289 | * it make much sense to actually read this field.) | |
290 | * | |
7db5d82d | 291 | ******************************************************************************/ |
50ffba1b | 292 | acpi_status acpi_read_bit_register(u32 register_id, u32 *return_value) |
7db5d82d | 293 | { |
7db5d82d | 294 | struct acpi_bit_register_info *bit_reg_info; |
88dcb04a BM |
295 | u32 register_value; |
296 | u32 value; | |
7db5d82d BM |
297 | acpi_status status; |
298 | ||
88dcb04a | 299 | ACPI_FUNCTION_TRACE_U32(acpi_read_bit_register, register_id); |
7db5d82d BM |
300 | |
301 | /* Get the info structure corresponding to the requested ACPI Register */ | |
302 | ||
303 | bit_reg_info = acpi_hw_get_bit_register_info(register_id); | |
304 | if (!bit_reg_info) { | |
305 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
306 | } | |
307 | ||
9892dd23 | 308 | /* Read the entire parent register */ |
7db5d82d BM |
309 | |
310 | status = acpi_hw_register_read(bit_reg_info->parent_register, | |
311 | ®ister_value); | |
88dcb04a BM |
312 | if (ACPI_FAILURE(status)) { |
313 | return_ACPI_STATUS(status); | |
314 | } | |
7db5d82d | 315 | |
88dcb04a | 316 | /* Normalize the value that was read, mask off other bits */ |
7db5d82d | 317 | |
88dcb04a BM |
318 | value = ((register_value & bit_reg_info->access_bit_mask) |
319 | >> bit_reg_info->bit_position); | |
7db5d82d | 320 | |
88dcb04a BM |
321 | ACPI_DEBUG_PRINT((ACPI_DB_IO, |
322 | "BitReg %X, ParentReg %X, Actual %8.8X, ReturnValue %8.8X\n", | |
323 | register_id, bit_reg_info->parent_register, | |
324 | register_value, value)); | |
7db5d82d | 325 | |
88dcb04a BM |
326 | *return_value = value; |
327 | return_ACPI_STATUS(AE_OK); | |
7db5d82d BM |
328 | } |
329 | ||
50ffba1b | 330 | ACPI_EXPORT_SYMBOL(acpi_read_bit_register) |
7db5d82d BM |
331 | |
332 | /******************************************************************************* | |
333 | * | |
50ffba1b | 334 | * FUNCTION: acpi_write_bit_register |
7db5d82d | 335 | * |
9892dd23 BM |
336 | * PARAMETERS: register_id - ID of ACPI Bit Register to access |
337 | * Value - Value to write to the register, in bit | |
42b2aa86 | 338 | * position zero. The bit is automatically |
9892dd23 | 339 | * shifted to the correct position. |
7db5d82d BM |
340 | * |
341 | * RETURN: Status | |
342 | * | |
9892dd23 BM |
343 | * DESCRIPTION: ACPI Bit Register write function. Acquires the hardware lock |
344 | * since most operations require a read/modify/write sequence. | |
345 | * | |
346 | * SUPPORTS: Bit fields in PM1 Status, PM1 Enable, PM1 Control, and | |
347 | * PM2 Control. | |
7db5d82d | 348 | * |
88dcb04a BM |
349 | * Note that at this level, the fact that there may be actually two |
350 | * hardware registers (A and B - and B may not exist) is abstracted. | |
351 | * | |
7db5d82d | 352 | ******************************************************************************/ |
50ffba1b | 353 | acpi_status acpi_write_bit_register(u32 register_id, u32 value) |
7db5d82d | 354 | { |
7db5d82d | 355 | struct acpi_bit_register_info *bit_reg_info; |
7db5d82d | 356 | acpi_cpu_flags lock_flags; |
88dcb04a BM |
357 | u32 register_value; |
358 | acpi_status status = AE_OK; | |
7db5d82d | 359 | |
50ffba1b | 360 | ACPI_FUNCTION_TRACE_U32(acpi_write_bit_register, register_id); |
7db5d82d BM |
361 | |
362 | /* Get the info structure corresponding to the requested ACPI Register */ | |
363 | ||
364 | bit_reg_info = acpi_hw_get_bit_register_info(register_id); | |
365 | if (!bit_reg_info) { | |
7db5d82d BM |
366 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
367 | } | |
368 | ||
369 | lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock); | |
370 | ||
7db5d82d | 371 | /* |
88dcb04a BM |
372 | * At this point, we know that the parent register is one of the |
373 | * following: PM1 Status, PM1 Enable, PM1 Control, or PM2 Control | |
7db5d82d | 374 | */ |
88dcb04a | 375 | if (bit_reg_info->parent_register != ACPI_REGISTER_PM1_STATUS) { |
7db5d82d | 376 | /* |
88dcb04a BM |
377 | * 1) Case for PM1 Enable, PM1 Control, and PM2 Control |
378 | * | |
379 | * Perform a register read to preserve the bits that we are not | |
380 | * interested in | |
7db5d82d | 381 | */ |
88dcb04a | 382 | status = acpi_hw_register_read(bit_reg_info->parent_register, |
7db5d82d BM |
383 | ®ister_value); |
384 | if (ACPI_FAILURE(status)) { | |
385 | goto unlock_and_exit; | |
386 | } | |
387 | ||
88dcb04a BM |
388 | /* |
389 | * Insert the input bit into the value that was just read | |
390 | * and write the register | |
391 | */ | |
7db5d82d BM |
392 | ACPI_REGISTER_INSERT_VALUE(register_value, |
393 | bit_reg_info->bit_position, | |
394 | bit_reg_info->access_bit_mask, | |
395 | value); | |
396 | ||
88dcb04a BM |
397 | status = acpi_hw_register_write(bit_reg_info->parent_register, |
398 | register_value); | |
399 | } else { | |
400 | /* | |
401 | * 2) Case for PM1 Status | |
402 | * | |
403 | * The Status register is different from the rest. Clear an event | |
404 | * by writing 1, writing 0 has no effect. So, the only relevant | |
405 | * information is the single bit we're interested in, all others | |
406 | * should be written as 0 so they will be left unchanged. | |
407 | */ | |
408 | register_value = ACPI_REGISTER_PREPARE_BITS(value, | |
409 | bit_reg_info-> | |
410 | bit_position, | |
411 | bit_reg_info-> | |
412 | access_bit_mask); | |
7db5d82d | 413 | |
88dcb04a | 414 | /* No need to write the register if value is all zeros */ |
7db5d82d | 415 | |
88dcb04a BM |
416 | if (register_value) { |
417 | status = | |
418 | acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS, | |
419 | register_value); | |
420 | } | |
7db5d82d BM |
421 | } |
422 | ||
88dcb04a BM |
423 | ACPI_DEBUG_PRINT((ACPI_DB_IO, |
424 | "BitReg %X, ParentReg %X, Value %8.8X, Actual %8.8X\n", | |
425 | register_id, bit_reg_info->parent_register, value, | |
426 | register_value)); | |
7db5d82d | 427 | |
88dcb04a | 428 | unlock_and_exit: |
7db5d82d | 429 | |
88dcb04a | 430 | acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags); |
7db5d82d BM |
431 | return_ACPI_STATUS(status); |
432 | } | |
433 | ||
50ffba1b | 434 | ACPI_EXPORT_SYMBOL(acpi_write_bit_register) |
33620c54 | 435 | #endif /* !ACPI_REDUCED_HARDWARE */ |
7db5d82d BM |
436 | /******************************************************************************* |
437 | * | |
438 | * FUNCTION: acpi_get_sleep_type_data | |
439 | * | |
440 | * PARAMETERS: sleep_state - Numeric sleep state | |
441 | * *sleep_type_a - Where SLP_TYPa is returned | |
442 | * *sleep_type_b - Where SLP_TYPb is returned | |
443 | * | |
ba494bee | 444 | * RETURN: status - ACPI status |
7db5d82d BM |
445 | * |
446 | * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested sleep | |
447 | * state. | |
448 | * | |
449 | ******************************************************************************/ | |
450 | acpi_status | |
451 | acpi_get_sleep_type_data(u8 sleep_state, u8 *sleep_type_a, u8 *sleep_type_b) | |
452 | { | |
453 | acpi_status status = AE_OK; | |
454 | struct acpi_evaluate_info *info; | |
455 | ||
456 | ACPI_FUNCTION_TRACE(acpi_get_sleep_type_data); | |
457 | ||
458 | /* Validate parameters */ | |
459 | ||
460 | if ((sleep_state > ACPI_S_STATES_MAX) || !sleep_type_a || !sleep_type_b) { | |
461 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
462 | } | |
463 | ||
464 | /* Allocate the evaluation information block */ | |
465 | ||
466 | info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); | |
467 | if (!info) { | |
468 | return_ACPI_STATUS(AE_NO_MEMORY); | |
469 | } | |
470 | ||
471 | info->pathname = | |
472 | ACPI_CAST_PTR(char, acpi_gbl_sleep_state_names[sleep_state]); | |
473 | ||
474 | /* Evaluate the namespace object containing the values for this state */ | |
475 | ||
476 | status = acpi_ns_evaluate(info); | |
477 | if (ACPI_FAILURE(status)) { | |
478 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, | |
479 | "%s while evaluating SleepState [%s]\n", | |
480 | acpi_format_exception(status), | |
481 | info->pathname)); | |
482 | ||
483 | goto cleanup; | |
484 | } | |
485 | ||
486 | /* Must have a return object */ | |
487 | ||
488 | if (!info->return_object) { | |
489 | ACPI_ERROR((AE_INFO, "No Sleep State object returned from [%s]", | |
490 | info->pathname)); | |
491 | status = AE_NOT_EXIST; | |
492 | } | |
493 | ||
494 | /* It must be of type Package */ | |
495 | ||
3371c19c | 496 | else if (info->return_object->common.type != ACPI_TYPE_PACKAGE) { |
7db5d82d BM |
497 | ACPI_ERROR((AE_INFO, |
498 | "Sleep State return object is not a Package")); | |
499 | status = AE_AML_OPERAND_TYPE; | |
500 | } | |
501 | ||
502 | /* | |
503 | * The package must have at least two elements. NOTE (March 2005): This | |
504 | * goes against the current ACPI spec which defines this object as a | |
505 | * package with one encoded DWORD element. However, existing practice | |
506 | * by BIOS vendors seems to be to have 2 or more elements, at least | |
507 | * one per sleep type (A/B). | |
508 | */ | |
509 | else if (info->return_object->package.count < 2) { | |
510 | ACPI_ERROR((AE_INFO, | |
511 | "Sleep State return package does not have at least two elements")); | |
512 | status = AE_AML_NO_OPERAND; | |
513 | } | |
514 | ||
515 | /* The first two elements must both be of type Integer */ | |
516 | ||
3371c19c | 517 | else if (((info->return_object->package.elements[0])->common.type |
7db5d82d | 518 | != ACPI_TYPE_INTEGER) || |
3371c19c | 519 | ((info->return_object->package.elements[1])->common.type |
7db5d82d BM |
520 | != ACPI_TYPE_INTEGER)) { |
521 | ACPI_ERROR((AE_INFO, | |
d4913dc6 BM |
522 | "Sleep State return package elements are not both Integers " |
523 | "(%s, %s)", | |
7db5d82d BM |
524 | acpi_ut_get_object_type_name(info->return_object-> |
525 | package.elements[0]), | |
526 | acpi_ut_get_object_type_name(info->return_object-> | |
527 | package.elements[1]))); | |
528 | status = AE_AML_OPERAND_TYPE; | |
529 | } else { | |
530 | /* Valid _Sx_ package size, type, and value */ | |
531 | ||
532 | *sleep_type_a = (u8) | |
533 | (info->return_object->package.elements[0])->integer.value; | |
534 | *sleep_type_b = (u8) | |
535 | (info->return_object->package.elements[1])->integer.value; | |
536 | } | |
537 | ||
538 | if (ACPI_FAILURE(status)) { | |
539 | ACPI_EXCEPTION((AE_INFO, status, | |
540 | "While evaluating SleepState [%s], bad Sleep object %p type %s", | |
541 | info->pathname, info->return_object, | |
542 | acpi_ut_get_object_type_name(info-> | |
543 | return_object))); | |
544 | } | |
545 | ||
546 | acpi_ut_remove_reference(info->return_object); | |
547 | ||
548 | cleanup: | |
549 | ACPI_FREE(info); | |
550 | return_ACPI_STATUS(status); | |
551 | } | |
552 | ||
553 | ACPI_EXPORT_SYMBOL(acpi_get_sleep_type_data) |