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7db5d82d BM |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: hwxface - Public ACPICA hardware interfaces | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
c8100dc4 | 8 | * Copyright (C) 2000 - 2016, Intel Corp. |
7db5d82d BM |
9 | * All rights reserved. |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * 1. Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions, and the following disclaimer, | |
16 | * without modification. | |
17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
18 | * substantially similar to the "NO WARRANTY" disclaimer below | |
19 | * ("Disclaimer") and any redistribution must be conditioned upon | |
20 | * including a substantially similar Disclaimer requirement for further | |
21 | * binary redistribution. | |
22 | * 3. Neither the names of the above-listed copyright holders nor the names | |
23 | * of any contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * Alternatively, this software may be distributed under the terms of the | |
27 | * GNU General Public License ("GPL") version 2 as published by the Free | |
28 | * Software Foundation. | |
29 | * | |
30 | * NO WARRANTY | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
41 | * POSSIBILITY OF SUCH DAMAGES. | |
42 | */ | |
43 | ||
839e928f LZ |
44 | #define EXPORT_ACPI_INTERFACES |
45 | ||
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 | /* | |
75c8044f LZ |
84 | * For I/O space, write directly to the OSL. This bypasses the port |
85 | * validation mechanism, which may block a valid write to the reset | |
86 | * register. | |
e07fcfd8 BM |
87 | * |
88 | * NOTE: | |
89 | * The ACPI spec requires the reset register width to be 8, so we | |
90 | * hardcode it here and ignore the FADT value. This maintains | |
91 | * compatibility with other ACPI implementations that have allowed | |
92 | * BIOS code with bad register width values to go unnoticed. | |
8a964236 BM |
93 | */ |
94 | status = | |
95 | acpi_os_write_port((acpi_io_address) reset_reg->address, | |
e07fcfd8 BM |
96 | acpi_gbl_FADT.reset_value, |
97 | ACPI_RESET_REGISTER_WIDTH); | |
8a964236 BM |
98 | } else { |
99 | /* Write the reset value to the reset register */ | |
100 | ||
101 | status = acpi_hw_write(acpi_gbl_FADT.reset_value, reset_reg); | |
102 | } | |
d3fd902d | 103 | |
d3fd902d BM |
104 | return_ACPI_STATUS(status); |
105 | } | |
106 | ||
107 | ACPI_EXPORT_SYMBOL(acpi_reset) | |
108 | ||
7db5d82d BM |
109 | /****************************************************************************** |
110 | * | |
111 | * FUNCTION: acpi_read | |
112 | * | |
ba494bee BM |
113 | * PARAMETERS: value - Where the value is returned |
114 | * reg - GAS register structure | |
7db5d82d BM |
115 | * |
116 | * RETURN: Status | |
117 | * | |
118 | * DESCRIPTION: Read from either memory or IO space. | |
119 | * | |
c6b5774c BM |
120 | * LIMITATIONS: <These limitations also apply to acpi_write> |
121 | * bit_width must be exactly 8, 16, 32, or 64. | |
ba494bee | 122 | * space_ID must be system_memory or system_IO. |
c6b5774c BM |
123 | * bit_offset and access_width are currently ignored, as there has |
124 | * not been a need to implement these. | |
125 | * | |
7db5d82d | 126 | ******************************************************************************/ |
c6b5774c | 127 | acpi_status acpi_read(u64 *return_value, struct acpi_generic_address *reg) |
7db5d82d | 128 | { |
c3faedcd BH |
129 | u32 value_lo; |
130 | u32 value_hi; | |
7db5d82d BM |
131 | u32 width; |
132 | u64 address; | |
133 | acpi_status status; | |
134 | ||
135 | ACPI_FUNCTION_NAME(acpi_read); | |
136 | ||
c6b5774c | 137 | if (!return_value) { |
ac0c8450 | 138 | return (AE_BAD_PARAMETER); |
7db5d82d BM |
139 | } |
140 | ||
c6b5774c | 141 | /* Validate contents of the GAS register. Allow 64-bit transfers */ |
7db5d82d | 142 | |
c6b5774c BM |
143 | status = acpi_hw_validate_register(reg, 64, &address); |
144 | if (ACPI_FAILURE(status)) { | |
145 | return (status); | |
7db5d82d BM |
146 | } |
147 | ||
7db5d82d | 148 | /* |
c3faedcd | 149 | * Two address spaces supported: Memory or I/O. PCI_Config is |
88dcb04a | 150 | * not supported here because the GAS structure is insufficient |
7db5d82d | 151 | */ |
c6b5774c BM |
152 | if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) { |
153 | status = acpi_os_read_memory((acpi_physical_address) | |
653f4b53 BM |
154 | address, return_value, |
155 | reg->bit_width); | |
c6b5774c BM |
156 | if (ACPI_FAILURE(status)) { |
157 | return (status); | |
158 | } | |
653f4b53 | 159 | } else { /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */ |
c6b5774c | 160 | |
c3faedcd BH |
161 | value_lo = 0; |
162 | value_hi = 0; | |
163 | ||
653f4b53 BM |
164 | width = reg->bit_width; |
165 | if (width == 64) { | |
166 | width = 32; /* Break into two 32-bit transfers */ | |
c6b5774c | 167 | } |
c6b5774c BM |
168 | |
169 | status = acpi_hw_read_port((acpi_io_address) | |
c3faedcd | 170 | address, &value_lo, width); |
c6b5774c BM |
171 | if (ACPI_FAILURE(status)) { |
172 | return (status); | |
173 | } | |
c6b5774c BM |
174 | |
175 | if (reg->bit_width == 64) { | |
176 | ||
177 | /* Read the top 32 bits */ | |
178 | ||
179 | status = acpi_hw_read_port((acpi_io_address) | |
c3faedcd BH |
180 | (address + 4), &value_hi, |
181 | 32); | |
c6b5774c BM |
182 | if (ACPI_FAILURE(status)) { |
183 | return (status); | |
184 | } | |
c6b5774c | 185 | } |
c3faedcd BH |
186 | |
187 | /* Set the return value only if status is AE_OK */ | |
188 | ||
189 | *return_value = (value_lo | ((u64)value_hi << 32)); | |
7db5d82d BM |
190 | } |
191 | ||
192 | ACPI_DEBUG_PRINT((ACPI_DB_IO, | |
c6b5774c BM |
193 | "Read: %8.8X%8.8X width %2d from %8.8X%8.8X (%s)\n", |
194 | ACPI_FORMAT_UINT64(*return_value), reg->bit_width, | |
195 | ACPI_FORMAT_UINT64(address), | |
7db5d82d BM |
196 | acpi_ut_get_region_name(reg->space_id))); |
197 | ||
c3faedcd | 198 | return (AE_OK); |
7db5d82d BM |
199 | } |
200 | ||
201 | ACPI_EXPORT_SYMBOL(acpi_read) | |
202 | ||
203 | /****************************************************************************** | |
204 | * | |
205 | * FUNCTION: acpi_write | |
206 | * | |
ba494bee BM |
207 | * PARAMETERS: value - Value to be written |
208 | * reg - GAS register structure | |
7db5d82d BM |
209 | * |
210 | * RETURN: Status | |
211 | * | |
212 | * DESCRIPTION: Write to either memory or IO space. | |
213 | * | |
214 | ******************************************************************************/ | |
c6b5774c | 215 | acpi_status acpi_write(u64 value, struct acpi_generic_address *reg) |
7db5d82d BM |
216 | { |
217 | u32 width; | |
218 | u64 address; | |
219 | acpi_status status; | |
220 | ||
221 | ACPI_FUNCTION_NAME(acpi_write); | |
222 | ||
c6b5774c | 223 | /* Validate contents of the GAS register. Allow 64-bit transfers */ |
7db5d82d | 224 | |
c6b5774c BM |
225 | status = acpi_hw_validate_register(reg, 64, &address); |
226 | if (ACPI_FAILURE(status)) { | |
227 | return (status); | |
7db5d82d BM |
228 | } |
229 | ||
7db5d82d | 230 | /* |
c6b5774c BM |
231 | * Two address spaces supported: Memory or IO. PCI_Config is |
232 | * not supported here because the GAS structure is insufficient | |
7db5d82d | 233 | */ |
c6b5774c BM |
234 | if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) { |
235 | status = acpi_os_write_memory((acpi_physical_address) | |
653f4b53 | 236 | address, value, reg->bit_width); |
c6b5774c BM |
237 | if (ACPI_FAILURE(status)) { |
238 | return (status); | |
239 | } | |
653f4b53 | 240 | } else { /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */ |
c6b5774c | 241 | |
653f4b53 BM |
242 | width = reg->bit_width; |
243 | if (width == 64) { | |
244 | width = 32; /* Break into two 32-bit transfers */ | |
c6b5774c | 245 | } |
c6b5774c BM |
246 | |
247 | status = acpi_hw_write_port((acpi_io_address) | |
248 | address, ACPI_LODWORD(value), | |
7db5d82d | 249 | width); |
c6b5774c BM |
250 | if (ACPI_FAILURE(status)) { |
251 | return (status); | |
252 | } | |
253 | ||
254 | if (reg->bit_width == 64) { | |
255 | status = acpi_hw_write_port((acpi_io_address) | |
256 | (address + 4), | |
257 | ACPI_HIDWORD(value), 32); | |
258 | if (ACPI_FAILURE(status)) { | |
259 | return (status); | |
260 | } | |
261 | } | |
7db5d82d BM |
262 | } |
263 | ||
264 | ACPI_DEBUG_PRINT((ACPI_DB_IO, | |
c6b5774c BM |
265 | "Wrote: %8.8X%8.8X width %2d to %8.8X%8.8X (%s)\n", |
266 | ACPI_FORMAT_UINT64(value), reg->bit_width, | |
267 | ACPI_FORMAT_UINT64(address), | |
7db5d82d BM |
268 | acpi_ut_get_region_name(reg->space_id))); |
269 | ||
270 | return (status); | |
271 | } | |
272 | ||
273 | ACPI_EXPORT_SYMBOL(acpi_write) | |
274 | ||
33620c54 | 275 | #if (!ACPI_REDUCED_HARDWARE) |
7db5d82d BM |
276 | /******************************************************************************* |
277 | * | |
50ffba1b | 278 | * FUNCTION: acpi_read_bit_register |
7db5d82d | 279 | * |
9892dd23 BM |
280 | * PARAMETERS: register_id - ID of ACPI Bit Register to access |
281 | * return_value - Value that was read from the register, | |
282 | * normalized to bit position zero. | |
7db5d82d | 283 | * |
9892dd23 | 284 | * RETURN: Status and the value read from the specified Register. Value |
7db5d82d BM |
285 | * returned is normalized to bit0 (is shifted all the way right) |
286 | * | |
287 | * DESCRIPTION: ACPI bit_register read function. Does not acquire the HW lock. | |
288 | * | |
9892dd23 BM |
289 | * SUPPORTS: Bit fields in PM1 Status, PM1 Enable, PM1 Control, and |
290 | * PM2 Control. | |
291 | * | |
292 | * Note: The hardware lock is not required when reading the ACPI bit registers | |
293 | * since almost all of them are single bit and it does not matter that | |
294 | * the parent hardware register can be split across two physical | |
295 | * registers. The only multi-bit field is SLP_TYP in the PM1 control | |
296 | * register, but this field does not cross an 8-bit boundary (nor does | |
297 | * it make much sense to actually read this field.) | |
298 | * | |
7db5d82d | 299 | ******************************************************************************/ |
50ffba1b | 300 | acpi_status acpi_read_bit_register(u32 register_id, u32 *return_value) |
7db5d82d | 301 | { |
7db5d82d | 302 | struct acpi_bit_register_info *bit_reg_info; |
88dcb04a BM |
303 | u32 register_value; |
304 | u32 value; | |
7db5d82d BM |
305 | acpi_status status; |
306 | ||
88dcb04a | 307 | ACPI_FUNCTION_TRACE_U32(acpi_read_bit_register, register_id); |
7db5d82d BM |
308 | |
309 | /* Get the info structure corresponding to the requested ACPI Register */ | |
310 | ||
311 | bit_reg_info = acpi_hw_get_bit_register_info(register_id); | |
312 | if (!bit_reg_info) { | |
313 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
314 | } | |
315 | ||
9892dd23 | 316 | /* Read the entire parent register */ |
7db5d82d BM |
317 | |
318 | status = acpi_hw_register_read(bit_reg_info->parent_register, | |
319 | ®ister_value); | |
88dcb04a BM |
320 | if (ACPI_FAILURE(status)) { |
321 | return_ACPI_STATUS(status); | |
322 | } | |
7db5d82d | 323 | |
88dcb04a | 324 | /* Normalize the value that was read, mask off other bits */ |
7db5d82d | 325 | |
88dcb04a BM |
326 | value = ((register_value & bit_reg_info->access_bit_mask) |
327 | >> bit_reg_info->bit_position); | |
7db5d82d | 328 | |
88dcb04a BM |
329 | ACPI_DEBUG_PRINT((ACPI_DB_IO, |
330 | "BitReg %X, ParentReg %X, Actual %8.8X, ReturnValue %8.8X\n", | |
331 | register_id, bit_reg_info->parent_register, | |
332 | register_value, value)); | |
7db5d82d | 333 | |
88dcb04a BM |
334 | *return_value = value; |
335 | return_ACPI_STATUS(AE_OK); | |
7db5d82d BM |
336 | } |
337 | ||
50ffba1b | 338 | ACPI_EXPORT_SYMBOL(acpi_read_bit_register) |
7db5d82d BM |
339 | |
340 | /******************************************************************************* | |
341 | * | |
50ffba1b | 342 | * FUNCTION: acpi_write_bit_register |
7db5d82d | 343 | * |
9892dd23 | 344 | * PARAMETERS: register_id - ID of ACPI Bit Register to access |
75c8044f | 345 | * value - Value to write to the register, in bit |
42b2aa86 | 346 | * position zero. The bit is automatically |
9892dd23 | 347 | * shifted to the correct position. |
7db5d82d BM |
348 | * |
349 | * RETURN: Status | |
350 | * | |
9892dd23 BM |
351 | * DESCRIPTION: ACPI Bit Register write function. Acquires the hardware lock |
352 | * since most operations require a read/modify/write sequence. | |
353 | * | |
354 | * SUPPORTS: Bit fields in PM1 Status, PM1 Enable, PM1 Control, and | |
355 | * PM2 Control. | |
7db5d82d | 356 | * |
88dcb04a BM |
357 | * Note that at this level, the fact that there may be actually two |
358 | * hardware registers (A and B - and B may not exist) is abstracted. | |
359 | * | |
7db5d82d | 360 | ******************************************************************************/ |
50ffba1b | 361 | acpi_status acpi_write_bit_register(u32 register_id, u32 value) |
7db5d82d | 362 | { |
7db5d82d | 363 | struct acpi_bit_register_info *bit_reg_info; |
7db5d82d | 364 | acpi_cpu_flags lock_flags; |
88dcb04a BM |
365 | u32 register_value; |
366 | acpi_status status = AE_OK; | |
7db5d82d | 367 | |
50ffba1b | 368 | ACPI_FUNCTION_TRACE_U32(acpi_write_bit_register, register_id); |
7db5d82d BM |
369 | |
370 | /* Get the info structure corresponding to the requested ACPI Register */ | |
371 | ||
372 | bit_reg_info = acpi_hw_get_bit_register_info(register_id); | |
373 | if (!bit_reg_info) { | |
7db5d82d BM |
374 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
375 | } | |
376 | ||
377 | lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock); | |
378 | ||
7db5d82d | 379 | /* |
88dcb04a BM |
380 | * At this point, we know that the parent register is one of the |
381 | * following: PM1 Status, PM1 Enable, PM1 Control, or PM2 Control | |
7db5d82d | 382 | */ |
88dcb04a | 383 | if (bit_reg_info->parent_register != ACPI_REGISTER_PM1_STATUS) { |
7db5d82d | 384 | /* |
88dcb04a BM |
385 | * 1) Case for PM1 Enable, PM1 Control, and PM2 Control |
386 | * | |
387 | * Perform a register read to preserve the bits that we are not | |
388 | * interested in | |
7db5d82d | 389 | */ |
88dcb04a | 390 | status = acpi_hw_register_read(bit_reg_info->parent_register, |
7db5d82d BM |
391 | ®ister_value); |
392 | if (ACPI_FAILURE(status)) { | |
393 | goto unlock_and_exit; | |
394 | } | |
395 | ||
88dcb04a BM |
396 | /* |
397 | * Insert the input bit into the value that was just read | |
398 | * and write the register | |
399 | */ | |
7db5d82d BM |
400 | ACPI_REGISTER_INSERT_VALUE(register_value, |
401 | bit_reg_info->bit_position, | |
402 | bit_reg_info->access_bit_mask, | |
403 | value); | |
404 | ||
88dcb04a BM |
405 | status = acpi_hw_register_write(bit_reg_info->parent_register, |
406 | register_value); | |
407 | } else { | |
408 | /* | |
409 | * 2) Case for PM1 Status | |
410 | * | |
411 | * The Status register is different from the rest. Clear an event | |
412 | * by writing 1, writing 0 has no effect. So, the only relevant | |
413 | * information is the single bit we're interested in, all others | |
414 | * should be written as 0 so they will be left unchanged. | |
415 | */ | |
416 | register_value = ACPI_REGISTER_PREPARE_BITS(value, | |
417 | bit_reg_info-> | |
418 | bit_position, | |
419 | bit_reg_info-> | |
420 | access_bit_mask); | |
7db5d82d | 421 | |
88dcb04a | 422 | /* No need to write the register if value is all zeros */ |
7db5d82d | 423 | |
88dcb04a BM |
424 | if (register_value) { |
425 | status = | |
426 | acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS, | |
427 | register_value); | |
428 | } | |
7db5d82d BM |
429 | } |
430 | ||
88dcb04a BM |
431 | ACPI_DEBUG_PRINT((ACPI_DB_IO, |
432 | "BitReg %X, ParentReg %X, Value %8.8X, Actual %8.8X\n", | |
433 | register_id, bit_reg_info->parent_register, value, | |
434 | register_value)); | |
7db5d82d | 435 | |
88dcb04a | 436 | unlock_and_exit: |
7db5d82d | 437 | |
88dcb04a | 438 | acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags); |
7db5d82d BM |
439 | return_ACPI_STATUS(status); |
440 | } | |
441 | ||
50ffba1b | 442 | ACPI_EXPORT_SYMBOL(acpi_write_bit_register) |
33620c54 | 443 | #endif /* !ACPI_REDUCED_HARDWARE */ |
7db5d82d BM |
444 | /******************************************************************************* |
445 | * | |
446 | * FUNCTION: acpi_get_sleep_type_data | |
447 | * | |
448 | * PARAMETERS: sleep_state - Numeric sleep state | |
449 | * *sleep_type_a - Where SLP_TYPa is returned | |
450 | * *sleep_type_b - Where SLP_TYPb is returned | |
451 | * | |
48ffb94f BM |
452 | * RETURN: Status |
453 | * | |
454 | * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested | |
455 | * sleep state via the appropriate \_Sx object. | |
456 | * | |
457 | * The sleep state package returned from the corresponding \_Sx_ object | |
458 | * must contain at least one integer. | |
459 | * | |
460 | * March 2005: | |
461 | * Added support for a package that contains two integers. This | |
462 | * goes against the ACPI specification which defines this object as a | |
463 | * package with one encoded DWORD integer. However, existing practice | |
464 | * by many BIOS vendors is to return a package with 2 or more integer | |
465 | * elements, at least one per sleep type (A/B). | |
7db5d82d | 466 | * |
48ffb94f BM |
467 | * January 2013: |
468 | * Therefore, we must be prepared to accept a package with either a | |
469 | * single integer or multiple integers. | |
470 | * | |
471 | * The single integer DWORD format is as follows: | |
472 | * BYTE 0 - Value for the PM1A SLP_TYP register | |
473 | * BYTE 1 - Value for the PM1B SLP_TYP register | |
474 | * BYTE 2-3 - Reserved | |
475 | * | |
476 | * The dual integer format is as follows: | |
477 | * Integer 0 - Value for the PM1A SLP_TYP register | |
478 | * Integer 1 - Value for the PM1A SLP_TYP register | |
7db5d82d BM |
479 | * |
480 | ******************************************************************************/ | |
481 | acpi_status | |
482 | acpi_get_sleep_type_data(u8 sleep_state, u8 *sleep_type_a, u8 *sleep_type_b) | |
483 | { | |
48ffb94f | 484 | acpi_status status; |
7db5d82d | 485 | struct acpi_evaluate_info *info; |
48ffb94f | 486 | union acpi_operand_object **elements; |
7db5d82d BM |
487 | |
488 | ACPI_FUNCTION_TRACE(acpi_get_sleep_type_data); | |
489 | ||
490 | /* Validate parameters */ | |
491 | ||
492 | if ((sleep_state > ACPI_S_STATES_MAX) || !sleep_type_a || !sleep_type_b) { | |
493 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
494 | } | |
495 | ||
496 | /* Allocate the evaluation information block */ | |
497 | ||
498 | info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); | |
499 | if (!info) { | |
500 | return_ACPI_STATUS(AE_NO_MEMORY); | |
501 | } | |
502 | ||
48ffb94f BM |
503 | /* |
504 | * Evaluate the \_Sx namespace object containing the register values | |
505 | * for this state | |
506 | */ | |
a59b679a PB |
507 | info->relative_pathname = ACPI_CAST_PTR(char, |
508 | acpi_gbl_sleep_state_names | |
509 | [sleep_state]); | |
510 | ||
7db5d82d BM |
511 | status = acpi_ns_evaluate(info); |
512 | if (ACPI_FAILURE(status)) { | |
a59b679a PB |
513 | if (status == AE_NOT_FOUND) { |
514 | ||
515 | /* The _Sx states are optional, ignore NOT_FOUND */ | |
516 | ||
517 | goto final_cleanup; | |
518 | } | |
519 | ||
520 | goto warning_cleanup; | |
7db5d82d BM |
521 | } |
522 | ||
523 | /* Must have a return object */ | |
524 | ||
525 | if (!info->return_object) { | |
526 | ACPI_ERROR((AE_INFO, "No Sleep State object returned from [%s]", | |
29a241cc | 527 | info->relative_pathname)); |
48ffb94f | 528 | status = AE_AML_NO_RETURN_VALUE; |
a59b679a | 529 | goto warning_cleanup; |
7db5d82d BM |
530 | } |
531 | ||
48ffb94f | 532 | /* Return object must be of type Package */ |
7db5d82d | 533 | |
48ffb94f | 534 | if (info->return_object->common.type != ACPI_TYPE_PACKAGE) { |
7db5d82d BM |
535 | ACPI_ERROR((AE_INFO, |
536 | "Sleep State return object is not a Package")); | |
537 | status = AE_AML_OPERAND_TYPE; | |
a59b679a | 538 | goto return_value_cleanup; |
7db5d82d BM |
539 | } |
540 | ||
541 | /* | |
48ffb94f BM |
542 | * Any warnings about the package length or the object types have |
543 | * already been issued by the predefined name module -- there is no | |
544 | * need to repeat them here. | |
7db5d82d | 545 | */ |
48ffb94f BM |
546 | elements = info->return_object->package.elements; |
547 | switch (info->return_object->package.count) { | |
548 | case 0: | |
1d1ea1b7 | 549 | |
48ffb94f BM |
550 | status = AE_AML_PACKAGE_LIMIT; |
551 | break; | |
552 | ||
553 | case 1: | |
1d1ea1b7 | 554 | |
48ffb94f BM |
555 | if (elements[0]->common.type != ACPI_TYPE_INTEGER) { |
556 | status = AE_AML_OPERAND_TYPE; | |
557 | break; | |
558 | } | |
7db5d82d | 559 | |
48ffb94f | 560 | /* A valid _Sx_ package with one integer */ |
7db5d82d | 561 | |
48ffb94f BM |
562 | *sleep_type_a = (u8)elements[0]->integer.value; |
563 | *sleep_type_b = (u8)(elements[0]->integer.value >> 8); | |
564 | break; | |
7db5d82d | 565 | |
48ffb94f BM |
566 | case 2: |
567 | default: | |
1d1ea1b7 | 568 | |
48ffb94f BM |
569 | if ((elements[0]->common.type != ACPI_TYPE_INTEGER) || |
570 | (elements[1]->common.type != ACPI_TYPE_INTEGER)) { | |
571 | status = AE_AML_OPERAND_TYPE; | |
572 | break; | |
573 | } | |
7db5d82d | 574 | |
48ffb94f BM |
575 | /* A valid _Sx_ package with two integers */ |
576 | ||
577 | *sleep_type_a = (u8)elements[0]->integer.value; | |
578 | *sleep_type_b = (u8)elements[1]->integer.value; | |
579 | break; | |
7db5d82d BM |
580 | } |
581 | ||
a59b679a | 582 | return_value_cleanup: |
7db5d82d BM |
583 | acpi_ut_remove_reference(info->return_object); |
584 | ||
a59b679a | 585 | warning_cleanup: |
48ffb94f BM |
586 | if (ACPI_FAILURE(status)) { |
587 | ACPI_EXCEPTION((AE_INFO, status, | |
588 | "While evaluating Sleep State [%s]", | |
29a241cc | 589 | info->relative_pathname)); |
48ffb94f BM |
590 | } |
591 | ||
a59b679a | 592 | final_cleanup: |
7db5d82d BM |
593 | ACPI_FREE(info); |
594 | return_ACPI_STATUS(status); | |
595 | } | |
596 | ||
597 | ACPI_EXPORT_SYMBOL(acpi_get_sleep_type_data) |