Commit | Line | Data |
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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 | 93 | */ |
f5c1e1c5 LZ |
94 | status = acpi_os_write_port((acpi_io_address)reset_reg->address, |
95 | acpi_gbl_FADT.reset_value, | |
96 | ACPI_RESET_REGISTER_WIDTH); | |
8a964236 BM |
97 | } else { |
98 | /* Write the reset value to the reset register */ | |
99 | ||
100 | status = acpi_hw_write(acpi_gbl_FADT.reset_value, reset_reg); | |
101 | } | |
d3fd902d | 102 | |
d3fd902d BM |
103 | return_ACPI_STATUS(status); |
104 | } | |
105 | ||
106 | ACPI_EXPORT_SYMBOL(acpi_reset) | |
107 | ||
7db5d82d BM |
108 | /****************************************************************************** |
109 | * | |
110 | * FUNCTION: acpi_read | |
111 | * | |
ba494bee BM |
112 | * PARAMETERS: value - Where the value is returned |
113 | * reg - GAS register structure | |
7db5d82d BM |
114 | * |
115 | * RETURN: Status | |
116 | * | |
117 | * DESCRIPTION: Read from either memory or IO space. | |
118 | * | |
c6b5774c BM |
119 | * LIMITATIONS: <These limitations also apply to acpi_write> |
120 | * bit_width must be exactly 8, 16, 32, or 64. | |
ba494bee | 121 | * space_ID must be system_memory or system_IO. |
c6b5774c BM |
122 | * bit_offset and access_width are currently ignored, as there has |
123 | * not been a need to implement these. | |
124 | * | |
7db5d82d | 125 | ******************************************************************************/ |
c6b5774c | 126 | acpi_status acpi_read(u64 *return_value, struct acpi_generic_address *reg) |
7db5d82d | 127 | { |
c3faedcd BH |
128 | u32 value_lo; |
129 | u32 value_hi; | |
7db5d82d BM |
130 | u32 width; |
131 | u64 address; | |
132 | acpi_status status; | |
133 | ||
134 | ACPI_FUNCTION_NAME(acpi_read); | |
135 | ||
c6b5774c | 136 | if (!return_value) { |
ac0c8450 | 137 | return (AE_BAD_PARAMETER); |
7db5d82d BM |
138 | } |
139 | ||
c6b5774c | 140 | /* Validate contents of the GAS register. Allow 64-bit transfers */ |
7db5d82d | 141 | |
c6b5774c BM |
142 | status = acpi_hw_validate_register(reg, 64, &address); |
143 | if (ACPI_FAILURE(status)) { | |
144 | return (status); | |
7db5d82d BM |
145 | } |
146 | ||
7db5d82d | 147 | /* |
c3faedcd | 148 | * Two address spaces supported: Memory or I/O. PCI_Config is |
88dcb04a | 149 | * not supported here because the GAS structure is insufficient |
7db5d82d | 150 | */ |
c6b5774c BM |
151 | if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) { |
152 | status = acpi_os_read_memory((acpi_physical_address) | |
653f4b53 BM |
153 | address, return_value, |
154 | reg->bit_width); | |
c6b5774c BM |
155 | if (ACPI_FAILURE(status)) { |
156 | return (status); | |
157 | } | |
653f4b53 | 158 | } else { /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */ |
c6b5774c | 159 | |
c3faedcd BH |
160 | value_lo = 0; |
161 | value_hi = 0; | |
162 | ||
653f4b53 BM |
163 | width = reg->bit_width; |
164 | if (width == 64) { | |
165 | width = 32; /* Break into two 32-bit transfers */ | |
c6b5774c | 166 | } |
c6b5774c BM |
167 | |
168 | status = acpi_hw_read_port((acpi_io_address) | |
c3faedcd | 169 | address, &value_lo, width); |
c6b5774c BM |
170 | if (ACPI_FAILURE(status)) { |
171 | return (status); | |
172 | } | |
c6b5774c BM |
173 | |
174 | if (reg->bit_width == 64) { | |
175 | ||
176 | /* Read the top 32 bits */ | |
177 | ||
178 | status = acpi_hw_read_port((acpi_io_address) | |
c3faedcd BH |
179 | (address + 4), &value_hi, |
180 | 32); | |
c6b5774c BM |
181 | if (ACPI_FAILURE(status)) { |
182 | return (status); | |
183 | } | |
c6b5774c | 184 | } |
c3faedcd BH |
185 | |
186 | /* Set the return value only if status is AE_OK */ | |
187 | ||
188 | *return_value = (value_lo | ((u64)value_hi << 32)); | |
7db5d82d BM |
189 | } |
190 | ||
191 | ACPI_DEBUG_PRINT((ACPI_DB_IO, | |
c6b5774c BM |
192 | "Read: %8.8X%8.8X width %2d from %8.8X%8.8X (%s)\n", |
193 | ACPI_FORMAT_UINT64(*return_value), reg->bit_width, | |
194 | ACPI_FORMAT_UINT64(address), | |
7db5d82d BM |
195 | acpi_ut_get_region_name(reg->space_id))); |
196 | ||
c3faedcd | 197 | return (AE_OK); |
7db5d82d BM |
198 | } |
199 | ||
200 | ACPI_EXPORT_SYMBOL(acpi_read) | |
201 | ||
202 | /****************************************************************************** | |
203 | * | |
204 | * FUNCTION: acpi_write | |
205 | * | |
ba494bee BM |
206 | * PARAMETERS: value - Value to be written |
207 | * reg - GAS register structure | |
7db5d82d BM |
208 | * |
209 | * RETURN: Status | |
210 | * | |
211 | * DESCRIPTION: Write to either memory or IO space. | |
212 | * | |
213 | ******************************************************************************/ | |
c6b5774c | 214 | acpi_status acpi_write(u64 value, struct acpi_generic_address *reg) |
7db5d82d BM |
215 | { |
216 | u32 width; | |
217 | u64 address; | |
218 | acpi_status status; | |
219 | ||
220 | ACPI_FUNCTION_NAME(acpi_write); | |
221 | ||
c6b5774c | 222 | /* Validate contents of the GAS register. Allow 64-bit transfers */ |
7db5d82d | 223 | |
c6b5774c BM |
224 | status = acpi_hw_validate_register(reg, 64, &address); |
225 | if (ACPI_FAILURE(status)) { | |
226 | return (status); | |
7db5d82d BM |
227 | } |
228 | ||
7db5d82d | 229 | /* |
c6b5774c BM |
230 | * Two address spaces supported: Memory or IO. PCI_Config is |
231 | * not supported here because the GAS structure is insufficient | |
7db5d82d | 232 | */ |
c6b5774c BM |
233 | if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) { |
234 | status = acpi_os_write_memory((acpi_physical_address) | |
653f4b53 | 235 | address, value, reg->bit_width); |
c6b5774c BM |
236 | if (ACPI_FAILURE(status)) { |
237 | return (status); | |
238 | } | |
653f4b53 | 239 | } else { /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */ |
c6b5774c | 240 | |
653f4b53 BM |
241 | width = reg->bit_width; |
242 | if (width == 64) { | |
243 | width = 32; /* Break into two 32-bit transfers */ | |
c6b5774c | 244 | } |
c6b5774c BM |
245 | |
246 | status = acpi_hw_write_port((acpi_io_address) | |
247 | address, ACPI_LODWORD(value), | |
7db5d82d | 248 | width); |
c6b5774c BM |
249 | if (ACPI_FAILURE(status)) { |
250 | return (status); | |
251 | } | |
252 | ||
253 | if (reg->bit_width == 64) { | |
254 | status = acpi_hw_write_port((acpi_io_address) | |
255 | (address + 4), | |
256 | ACPI_HIDWORD(value), 32); | |
257 | if (ACPI_FAILURE(status)) { | |
258 | return (status); | |
259 | } | |
260 | } | |
7db5d82d BM |
261 | } |
262 | ||
263 | ACPI_DEBUG_PRINT((ACPI_DB_IO, | |
c6b5774c BM |
264 | "Wrote: %8.8X%8.8X width %2d to %8.8X%8.8X (%s)\n", |
265 | ACPI_FORMAT_UINT64(value), reg->bit_width, | |
266 | ACPI_FORMAT_UINT64(address), | |
7db5d82d BM |
267 | acpi_ut_get_region_name(reg->space_id))); |
268 | ||
269 | return (status); | |
270 | } | |
271 | ||
272 | ACPI_EXPORT_SYMBOL(acpi_write) | |
273 | ||
33620c54 | 274 | #if (!ACPI_REDUCED_HARDWARE) |
7db5d82d BM |
275 | /******************************************************************************* |
276 | * | |
50ffba1b | 277 | * FUNCTION: acpi_read_bit_register |
7db5d82d | 278 | * |
9892dd23 BM |
279 | * PARAMETERS: register_id - ID of ACPI Bit Register to access |
280 | * return_value - Value that was read from the register, | |
281 | * normalized to bit position zero. | |
7db5d82d | 282 | * |
9892dd23 | 283 | * RETURN: Status and the value read from the specified Register. Value |
7db5d82d BM |
284 | * returned is normalized to bit0 (is shifted all the way right) |
285 | * | |
286 | * DESCRIPTION: ACPI bit_register read function. Does not acquire the HW lock. | |
287 | * | |
9892dd23 BM |
288 | * SUPPORTS: Bit fields in PM1 Status, PM1 Enable, PM1 Control, and |
289 | * PM2 Control. | |
290 | * | |
291 | * Note: The hardware lock is not required when reading the ACPI bit registers | |
292 | * since almost all of them are single bit and it does not matter that | |
293 | * the parent hardware register can be split across two physical | |
294 | * registers. The only multi-bit field is SLP_TYP in the PM1 control | |
295 | * register, but this field does not cross an 8-bit boundary (nor does | |
296 | * it make much sense to actually read this field.) | |
297 | * | |
7db5d82d | 298 | ******************************************************************************/ |
50ffba1b | 299 | acpi_status acpi_read_bit_register(u32 register_id, u32 *return_value) |
7db5d82d | 300 | { |
7db5d82d | 301 | struct acpi_bit_register_info *bit_reg_info; |
88dcb04a BM |
302 | u32 register_value; |
303 | u32 value; | |
7db5d82d BM |
304 | acpi_status status; |
305 | ||
88dcb04a | 306 | ACPI_FUNCTION_TRACE_U32(acpi_read_bit_register, register_id); |
7db5d82d BM |
307 | |
308 | /* Get the info structure corresponding to the requested ACPI Register */ | |
309 | ||
310 | bit_reg_info = acpi_hw_get_bit_register_info(register_id); | |
311 | if (!bit_reg_info) { | |
312 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
313 | } | |
314 | ||
9892dd23 | 315 | /* Read the entire parent register */ |
7db5d82d BM |
316 | |
317 | status = acpi_hw_register_read(bit_reg_info->parent_register, | |
318 | ®ister_value); | |
88dcb04a BM |
319 | if (ACPI_FAILURE(status)) { |
320 | return_ACPI_STATUS(status); | |
321 | } | |
7db5d82d | 322 | |
88dcb04a | 323 | /* Normalize the value that was read, mask off other bits */ |
7db5d82d | 324 | |
88dcb04a BM |
325 | value = ((register_value & bit_reg_info->access_bit_mask) |
326 | >> bit_reg_info->bit_position); | |
7db5d82d | 327 | |
88dcb04a BM |
328 | ACPI_DEBUG_PRINT((ACPI_DB_IO, |
329 | "BitReg %X, ParentReg %X, Actual %8.8X, ReturnValue %8.8X\n", | |
330 | register_id, bit_reg_info->parent_register, | |
331 | register_value, value)); | |
7db5d82d | 332 | |
88dcb04a BM |
333 | *return_value = value; |
334 | return_ACPI_STATUS(AE_OK); | |
7db5d82d BM |
335 | } |
336 | ||
50ffba1b | 337 | ACPI_EXPORT_SYMBOL(acpi_read_bit_register) |
7db5d82d BM |
338 | |
339 | /******************************************************************************* | |
340 | * | |
50ffba1b | 341 | * FUNCTION: acpi_write_bit_register |
7db5d82d | 342 | * |
9892dd23 | 343 | * PARAMETERS: register_id - ID of ACPI Bit Register to access |
75c8044f | 344 | * value - Value to write to the register, in bit |
42b2aa86 | 345 | * position zero. The bit is automatically |
9892dd23 | 346 | * shifted to the correct position. |
7db5d82d BM |
347 | * |
348 | * RETURN: Status | |
349 | * | |
9892dd23 BM |
350 | * DESCRIPTION: ACPI Bit Register write function. Acquires the hardware lock |
351 | * since most operations require a read/modify/write sequence. | |
352 | * | |
353 | * SUPPORTS: Bit fields in PM1 Status, PM1 Enable, PM1 Control, and | |
354 | * PM2 Control. | |
7db5d82d | 355 | * |
88dcb04a BM |
356 | * Note that at this level, the fact that there may be actually two |
357 | * hardware registers (A and B - and B may not exist) is abstracted. | |
358 | * | |
7db5d82d | 359 | ******************************************************************************/ |
50ffba1b | 360 | acpi_status acpi_write_bit_register(u32 register_id, u32 value) |
7db5d82d | 361 | { |
7db5d82d | 362 | struct acpi_bit_register_info *bit_reg_info; |
7db5d82d | 363 | acpi_cpu_flags lock_flags; |
88dcb04a BM |
364 | u32 register_value; |
365 | acpi_status status = AE_OK; | |
7db5d82d | 366 | |
50ffba1b | 367 | ACPI_FUNCTION_TRACE_U32(acpi_write_bit_register, register_id); |
7db5d82d BM |
368 | |
369 | /* Get the info structure corresponding to the requested ACPI Register */ | |
370 | ||
371 | bit_reg_info = acpi_hw_get_bit_register_info(register_id); | |
372 | if (!bit_reg_info) { | |
7db5d82d BM |
373 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
374 | } | |
375 | ||
376 | lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock); | |
377 | ||
7db5d82d | 378 | /* |
88dcb04a BM |
379 | * At this point, we know that the parent register is one of the |
380 | * following: PM1 Status, PM1 Enable, PM1 Control, or PM2 Control | |
7db5d82d | 381 | */ |
88dcb04a | 382 | if (bit_reg_info->parent_register != ACPI_REGISTER_PM1_STATUS) { |
7db5d82d | 383 | /* |
88dcb04a BM |
384 | * 1) Case for PM1 Enable, PM1 Control, and PM2 Control |
385 | * | |
386 | * Perform a register read to preserve the bits that we are not | |
387 | * interested in | |
7db5d82d | 388 | */ |
88dcb04a | 389 | status = acpi_hw_register_read(bit_reg_info->parent_register, |
7db5d82d BM |
390 | ®ister_value); |
391 | if (ACPI_FAILURE(status)) { | |
392 | goto unlock_and_exit; | |
393 | } | |
394 | ||
88dcb04a BM |
395 | /* |
396 | * Insert the input bit into the value that was just read | |
397 | * and write the register | |
398 | */ | |
7db5d82d BM |
399 | ACPI_REGISTER_INSERT_VALUE(register_value, |
400 | bit_reg_info->bit_position, | |
401 | bit_reg_info->access_bit_mask, | |
402 | value); | |
403 | ||
88dcb04a BM |
404 | status = acpi_hw_register_write(bit_reg_info->parent_register, |
405 | register_value); | |
406 | } else { | |
407 | /* | |
408 | * 2) Case for PM1 Status | |
409 | * | |
410 | * The Status register is different from the rest. Clear an event | |
411 | * by writing 1, writing 0 has no effect. So, the only relevant | |
412 | * information is the single bit we're interested in, all others | |
413 | * should be written as 0 so they will be left unchanged. | |
414 | */ | |
415 | register_value = ACPI_REGISTER_PREPARE_BITS(value, | |
416 | bit_reg_info-> | |
417 | bit_position, | |
418 | bit_reg_info-> | |
419 | access_bit_mask); | |
7db5d82d | 420 | |
88dcb04a | 421 | /* No need to write the register if value is all zeros */ |
7db5d82d | 422 | |
88dcb04a BM |
423 | if (register_value) { |
424 | status = | |
425 | acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS, | |
426 | register_value); | |
427 | } | |
7db5d82d BM |
428 | } |
429 | ||
88dcb04a BM |
430 | ACPI_DEBUG_PRINT((ACPI_DB_IO, |
431 | "BitReg %X, ParentReg %X, Value %8.8X, Actual %8.8X\n", | |
432 | register_id, bit_reg_info->parent_register, value, | |
433 | register_value)); | |
7db5d82d | 434 | |
88dcb04a | 435 | unlock_and_exit: |
7db5d82d | 436 | |
88dcb04a | 437 | acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags); |
7db5d82d BM |
438 | return_ACPI_STATUS(status); |
439 | } | |
440 | ||
50ffba1b | 441 | ACPI_EXPORT_SYMBOL(acpi_write_bit_register) |
33620c54 | 442 | #endif /* !ACPI_REDUCED_HARDWARE */ |
7db5d82d BM |
443 | /******************************************************************************* |
444 | * | |
445 | * FUNCTION: acpi_get_sleep_type_data | |
446 | * | |
447 | * PARAMETERS: sleep_state - Numeric sleep state | |
448 | * *sleep_type_a - Where SLP_TYPa is returned | |
449 | * *sleep_type_b - Where SLP_TYPb is returned | |
450 | * | |
48ffb94f BM |
451 | * RETURN: Status |
452 | * | |
453 | * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested | |
454 | * sleep state via the appropriate \_Sx object. | |
455 | * | |
456 | * The sleep state package returned from the corresponding \_Sx_ object | |
457 | * must contain at least one integer. | |
458 | * | |
459 | * March 2005: | |
460 | * Added support for a package that contains two integers. This | |
461 | * goes against the ACPI specification which defines this object as a | |
462 | * package with one encoded DWORD integer. However, existing practice | |
463 | * by many BIOS vendors is to return a package with 2 or more integer | |
464 | * elements, at least one per sleep type (A/B). | |
7db5d82d | 465 | * |
48ffb94f BM |
466 | * January 2013: |
467 | * Therefore, we must be prepared to accept a package with either a | |
468 | * single integer or multiple integers. | |
469 | * | |
470 | * The single integer DWORD format is as follows: | |
471 | * BYTE 0 - Value for the PM1A SLP_TYP register | |
472 | * BYTE 1 - Value for the PM1B SLP_TYP register | |
473 | * BYTE 2-3 - Reserved | |
474 | * | |
475 | * The dual integer format is as follows: | |
476 | * Integer 0 - Value for the PM1A SLP_TYP register | |
477 | * Integer 1 - Value for the PM1A SLP_TYP register | |
7db5d82d BM |
478 | * |
479 | ******************************************************************************/ | |
480 | acpi_status | |
481 | acpi_get_sleep_type_data(u8 sleep_state, u8 *sleep_type_a, u8 *sleep_type_b) | |
482 | { | |
48ffb94f | 483 | acpi_status status; |
7db5d82d | 484 | struct acpi_evaluate_info *info; |
48ffb94f | 485 | union acpi_operand_object **elements; |
7db5d82d BM |
486 | |
487 | ACPI_FUNCTION_TRACE(acpi_get_sleep_type_data); | |
488 | ||
489 | /* Validate parameters */ | |
490 | ||
491 | if ((sleep_state > ACPI_S_STATES_MAX) || !sleep_type_a || !sleep_type_b) { | |
492 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
493 | } | |
494 | ||
495 | /* Allocate the evaluation information block */ | |
496 | ||
497 | info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); | |
498 | if (!info) { | |
499 | return_ACPI_STATUS(AE_NO_MEMORY); | |
500 | } | |
501 | ||
48ffb94f BM |
502 | /* |
503 | * Evaluate the \_Sx namespace object containing the register values | |
504 | * for this state | |
505 | */ | |
0dfaaa3d | 506 | info->relative_pathname = acpi_gbl_sleep_state_names[sleep_state]; |
a59b679a | 507 | |
7db5d82d BM |
508 | status = acpi_ns_evaluate(info); |
509 | if (ACPI_FAILURE(status)) { | |
a59b679a PB |
510 | if (status == AE_NOT_FOUND) { |
511 | ||
512 | /* The _Sx states are optional, ignore NOT_FOUND */ | |
513 | ||
514 | goto final_cleanup; | |
515 | } | |
516 | ||
517 | goto warning_cleanup; | |
7db5d82d BM |
518 | } |
519 | ||
520 | /* Must have a return object */ | |
521 | ||
522 | if (!info->return_object) { | |
523 | ACPI_ERROR((AE_INFO, "No Sleep State object returned from [%s]", | |
29a241cc | 524 | info->relative_pathname)); |
48ffb94f | 525 | status = AE_AML_NO_RETURN_VALUE; |
a59b679a | 526 | goto warning_cleanup; |
7db5d82d BM |
527 | } |
528 | ||
48ffb94f | 529 | /* Return object must be of type Package */ |
7db5d82d | 530 | |
48ffb94f | 531 | if (info->return_object->common.type != ACPI_TYPE_PACKAGE) { |
7db5d82d BM |
532 | ACPI_ERROR((AE_INFO, |
533 | "Sleep State return object is not a Package")); | |
534 | status = AE_AML_OPERAND_TYPE; | |
a59b679a | 535 | goto return_value_cleanup; |
7db5d82d BM |
536 | } |
537 | ||
538 | /* | |
48ffb94f BM |
539 | * Any warnings about the package length or the object types have |
540 | * already been issued by the predefined name module -- there is no | |
541 | * need to repeat them here. | |
7db5d82d | 542 | */ |
48ffb94f BM |
543 | elements = info->return_object->package.elements; |
544 | switch (info->return_object->package.count) { | |
545 | case 0: | |
1d1ea1b7 | 546 | |
48ffb94f BM |
547 | status = AE_AML_PACKAGE_LIMIT; |
548 | break; | |
549 | ||
550 | case 1: | |
1d1ea1b7 | 551 | |
48ffb94f BM |
552 | if (elements[0]->common.type != ACPI_TYPE_INTEGER) { |
553 | status = AE_AML_OPERAND_TYPE; | |
554 | break; | |
555 | } | |
7db5d82d | 556 | |
48ffb94f | 557 | /* A valid _Sx_ package with one integer */ |
7db5d82d | 558 | |
48ffb94f BM |
559 | *sleep_type_a = (u8)elements[0]->integer.value; |
560 | *sleep_type_b = (u8)(elements[0]->integer.value >> 8); | |
561 | break; | |
7db5d82d | 562 | |
48ffb94f BM |
563 | case 2: |
564 | default: | |
1d1ea1b7 | 565 | |
48ffb94f BM |
566 | if ((elements[0]->common.type != ACPI_TYPE_INTEGER) || |
567 | (elements[1]->common.type != ACPI_TYPE_INTEGER)) { | |
568 | status = AE_AML_OPERAND_TYPE; | |
569 | break; | |
570 | } | |
7db5d82d | 571 | |
48ffb94f BM |
572 | /* A valid _Sx_ package with two integers */ |
573 | ||
574 | *sleep_type_a = (u8)elements[0]->integer.value; | |
575 | *sleep_type_b = (u8)elements[1]->integer.value; | |
576 | break; | |
7db5d82d BM |
577 | } |
578 | ||
a59b679a | 579 | return_value_cleanup: |
7db5d82d BM |
580 | acpi_ut_remove_reference(info->return_object); |
581 | ||
a59b679a | 582 | warning_cleanup: |
48ffb94f BM |
583 | if (ACPI_FAILURE(status)) { |
584 | ACPI_EXCEPTION((AE_INFO, status, | |
585 | "While evaluating Sleep State [%s]", | |
29a241cc | 586 | info->relative_pathname)); |
48ffb94f BM |
587 | } |
588 | ||
a59b679a | 589 | final_cleanup: |
7db5d82d BM |
590 | ACPI_FREE(info); |
591 | return_ACPI_STATUS(status); | |
592 | } | |
593 | ||
594 | ACPI_EXPORT_SYMBOL(acpi_get_sleep_type_data) |