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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * sleep.c - ACPI sleep support. | |
3 | * | |
e2a5b420 | 4 | * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> |
1da177e4 LT |
5 | * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com> |
6 | * Copyright (c) 2000-2003 Patrick Mochel | |
7 | * Copyright (c) 2003 Open Source Development Lab | |
8 | * | |
9 | * This file is released under the GPLv2. | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/delay.h> | |
14 | #include <linux/irq.h> | |
15 | #include <linux/dmi.h> | |
16 | #include <linux/device.h> | |
17 | #include <linux/suspend.h> | |
e49f711c | 18 | #include <linux/reboot.h> |
f216cc37 AS |
19 | |
20 | #include <asm/io.h> | |
21 | ||
1da177e4 LT |
22 | #include <acpi/acpi_bus.h> |
23 | #include <acpi/acpi_drivers.h> | |
e60cc7a6 BH |
24 | |
25 | #include "internal.h" | |
1da177e4 LT |
26 | #include "sleep.h" |
27 | ||
28 | u8 sleep_states[ACPI_S_STATE_COUNT]; | |
29 | ||
e49f711c ZY |
30 | static void acpi_sleep_tts_switch(u32 acpi_state) |
31 | { | |
32 | union acpi_object in_arg = { ACPI_TYPE_INTEGER }; | |
33 | struct acpi_object_list arg_list = { 1, &in_arg }; | |
34 | acpi_status status = AE_OK; | |
35 | ||
36 | in_arg.integer.value = acpi_state; | |
37 | status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL); | |
38 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
39 | /* | |
40 | * OS can't evaluate the _TTS object correctly. Some warning | |
41 | * message will be printed. But it won't break anything. | |
42 | */ | |
43 | printk(KERN_NOTICE "Failure in evaluating _TTS object\n"); | |
44 | } | |
45 | } | |
46 | ||
47 | static int tts_notify_reboot(struct notifier_block *this, | |
48 | unsigned long code, void *x) | |
49 | { | |
50 | acpi_sleep_tts_switch(ACPI_STATE_S5); | |
51 | return NOTIFY_DONE; | |
52 | } | |
53 | ||
54 | static struct notifier_block tts_notifier = { | |
55 | .notifier_call = tts_notify_reboot, | |
56 | .next = NULL, | |
57 | .priority = 0, | |
58 | }; | |
59 | ||
c9b6c8f6 | 60 | static int acpi_sleep_prepare(u32 acpi_state) |
2f3f2226 AS |
61 | { |
62 | #ifdef CONFIG_ACPI_SLEEP | |
63 | /* do we have a wakeup address for S2 and S3? */ | |
64 | if (acpi_state == ACPI_STATE_S3) { | |
65 | if (!acpi_wakeup_address) { | |
66 | return -EFAULT; | |
67 | } | |
4b4f7280 PA |
68 | acpi_set_firmware_waking_vector( |
69 | (acpi_physical_address)acpi_wakeup_address); | |
2f3f2226 AS |
70 | |
71 | } | |
72 | ACPI_FLUSH_CPU_CACHE(); | |
73 | acpi_enable_wakeup_device_prep(acpi_state); | |
74 | #endif | |
c9b6c8f6 RW |
75 | printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n", |
76 | acpi_state); | |
2f3f2226 AS |
77 | acpi_enter_sleep_state_prep(acpi_state); |
78 | return 0; | |
79 | } | |
80 | ||
5d1e072b | 81 | #ifdef CONFIG_ACPI_SLEEP |
b849075c | 82 | static u32 acpi_target_sleep_state = ACPI_STATE_S0; |
d7f0eea9 | 83 | |
d8f3de0d RW |
84 | /* |
85 | * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the | |
86 | * user to request that behavior by using the 'acpi_old_suspend_ordering' | |
87 | * kernel command line option that causes the following variable to be set. | |
88 | */ | |
89 | static bool old_suspend_ordering; | |
90 | ||
91 | void __init acpi_old_suspend_ordering(void) | |
92 | { | |
93 | old_suspend_ordering = true; | |
94 | } | |
95 | ||
96 | /** | |
d5a64513 | 97 | * acpi_pm_freeze - Disable the GPEs and suspend EC transactions. |
d8f3de0d | 98 | */ |
d5a64513 | 99 | static int acpi_pm_freeze(void) |
d8f3de0d | 100 | { |
3d97e426 | 101 | acpi_disable_all_gpes(); |
d5a64513 | 102 | acpi_os_wait_events_complete(NULL); |
fe955682 | 103 | acpi_ec_block_transactions(); |
d8f3de0d RW |
104 | return 0; |
105 | } | |
106 | ||
107 | /** | |
108 | * __acpi_pm_prepare - Prepare the platform to enter the target state. | |
109 | * | |
110 | * If necessary, set the firmware waking vector and do arch-specific | |
111 | * nastiness to get the wakeup code to the waking vector. | |
112 | */ | |
113 | static int __acpi_pm_prepare(void) | |
114 | { | |
115 | int error = acpi_sleep_prepare(acpi_target_sleep_state); | |
116 | ||
117 | if (error) | |
118 | acpi_target_sleep_state = ACPI_STATE_S0; | |
119 | return error; | |
120 | } | |
121 | ||
122 | /** | |
123 | * acpi_pm_prepare - Prepare the platform to enter the target sleep | |
124 | * state and disable the GPEs. | |
125 | */ | |
126 | static int acpi_pm_prepare(void) | |
127 | { | |
128 | int error = __acpi_pm_prepare(); | |
129 | ||
130 | if (!error) | |
d5a64513 RW |
131 | acpi_pm_freeze(); |
132 | ||
d8f3de0d RW |
133 | return error; |
134 | } | |
135 | ||
136 | /** | |
137 | * acpi_pm_finish - Instruct the platform to leave a sleep state. | |
138 | * | |
139 | * This is called after we wake back up (or if entering the sleep state | |
140 | * failed). | |
141 | */ | |
142 | static void acpi_pm_finish(void) | |
143 | { | |
144 | u32 acpi_state = acpi_target_sleep_state; | |
145 | ||
146 | if (acpi_state == ACPI_STATE_S0) | |
147 | return; | |
1da177e4 | 148 | |
d8f3de0d RW |
149 | printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n", |
150 | acpi_state); | |
151 | acpi_disable_wakeup_device(acpi_state); | |
152 | acpi_leave_sleep_state(acpi_state); | |
153 | ||
154 | /* reset firmware waking vector */ | |
155 | acpi_set_firmware_waking_vector((acpi_physical_address) 0); | |
156 | ||
157 | acpi_target_sleep_state = ACPI_STATE_S0; | |
158 | } | |
159 | ||
160 | /** | |
161 | * acpi_pm_end - Finish up suspend sequence. | |
162 | */ | |
163 | static void acpi_pm_end(void) | |
164 | { | |
165 | /* | |
166 | * This is necessary in case acpi_pm_finish() is not called during a | |
167 | * failing transition to a sleep state. | |
168 | */ | |
169 | acpi_target_sleep_state = ACPI_STATE_S0; | |
e49f711c | 170 | acpi_sleep_tts_switch(acpi_target_sleep_state); |
d8f3de0d | 171 | } |
92daa7b5 RW |
172 | #else /* !CONFIG_ACPI_SLEEP */ |
173 | #define acpi_target_sleep_state ACPI_STATE_S0 | |
5d1e072b | 174 | #endif /* CONFIG_ACPI_SLEEP */ |
1da177e4 | 175 | |
d8f3de0d | 176 | #ifdef CONFIG_SUSPEND |
1da177e4 LT |
177 | extern void do_suspend_lowlevel(void); |
178 | ||
179 | static u32 acpi_suspend_states[] = { | |
e2a5b420 AS |
180 | [PM_SUSPEND_ON] = ACPI_STATE_S0, |
181 | [PM_SUSPEND_STANDBY] = ACPI_STATE_S1, | |
182 | [PM_SUSPEND_MEM] = ACPI_STATE_S3, | |
e2a5b420 | 183 | [PM_SUSPEND_MAX] = ACPI_STATE_S5 |
1da177e4 LT |
184 | }; |
185 | ||
e9b3aba8 | 186 | /** |
2c6e33c3 | 187 | * acpi_suspend_begin - Set the target system sleep state to the state |
e9b3aba8 RW |
188 | * associated with given @pm_state, if supported. |
189 | */ | |
2c6e33c3 | 190 | static int acpi_suspend_begin(suspend_state_t pm_state) |
e9b3aba8 RW |
191 | { |
192 | u32 acpi_state = acpi_suspend_states[pm_state]; | |
193 | int error = 0; | |
194 | ||
195 | if (sleep_states[acpi_state]) { | |
196 | acpi_target_sleep_state = acpi_state; | |
e49f711c | 197 | acpi_sleep_tts_switch(acpi_target_sleep_state); |
e9b3aba8 RW |
198 | } else { |
199 | printk(KERN_ERR "ACPI does not support this state: %d\n", | |
200 | pm_state); | |
201 | error = -ENOSYS; | |
202 | } | |
203 | return error; | |
204 | } | |
205 | ||
1da177e4 | 206 | /** |
2c6e33c3 | 207 | * acpi_suspend_enter - Actually enter a sleep state. |
e9b3aba8 | 208 | * @pm_state: ignored |
1da177e4 | 209 | * |
50ad147a RW |
210 | * Flush caches and go to sleep. For STR we have to call arch-specific |
211 | * assembly, which in turn call acpi_enter_sleep_state(). | |
1da177e4 LT |
212 | * It's unfortunate, but it works. Please fix if you're feeling frisky. |
213 | */ | |
2c6e33c3 | 214 | static int acpi_suspend_enter(suspend_state_t pm_state) |
1da177e4 LT |
215 | { |
216 | acpi_status status = AE_OK; | |
217 | unsigned long flags = 0; | |
e9b3aba8 | 218 | u32 acpi_state = acpi_target_sleep_state; |
1da177e4 LT |
219 | |
220 | ACPI_FLUSH_CPU_CACHE(); | |
221 | ||
222 | /* Do arch specific saving of state. */ | |
50ad147a | 223 | if (acpi_state == ACPI_STATE_S3) { |
1da177e4 | 224 | int error = acpi_save_state_mem(); |
e9b3aba8 | 225 | |
60417f59 | 226 | if (error) |
1da177e4 LT |
227 | return error; |
228 | } | |
229 | ||
1da177e4 LT |
230 | local_irq_save(flags); |
231 | acpi_enable_wakeup_device(acpi_state); | |
e9b3aba8 RW |
232 | switch (acpi_state) { |
233 | case ACPI_STATE_S1: | |
1da177e4 LT |
234 | barrier(); |
235 | status = acpi_enter_sleep_state(acpi_state); | |
236 | break; | |
237 | ||
e9b3aba8 | 238 | case ACPI_STATE_S3: |
1da177e4 LT |
239 | do_suspend_lowlevel(); |
240 | break; | |
1da177e4 | 241 | } |
872d83d0 | 242 | |
b6dacf63 MG |
243 | /* This violates the spec but is required for bug compatibility. */ |
244 | acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1); | |
65df7847 | 245 | |
c95d47a8 RW |
246 | /* Reprogram control registers and execute _BFS */ |
247 | acpi_leave_sleep_state_prep(acpi_state); | |
248 | ||
23b168d4 | 249 | /* ACPI 3.0 specs (P62) says that it's the responsibility |
872d83d0 AP |
250 | * of the OSPM to clear the status bit [ implying that the |
251 | * POWER_BUTTON event should not reach userspace ] | |
252 | */ | |
253 | if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) | |
254 | acpi_clear_event(ACPI_EVENT_POWER_BUTTON); | |
255 | ||
a3627f67 SL |
256 | /* |
257 | * Disable and clear GPE status before interrupt is enabled. Some GPEs | |
258 | * (like wakeup GPE) haven't handler, this can avoid such GPE misfire. | |
259 | * acpi_leave_sleep_state will reenable specific GPEs later | |
260 | */ | |
3d97e426 | 261 | acpi_disable_all_gpes(); |
d5a64513 | 262 | /* Allow EC transactions to happen. */ |
fe955682 | 263 | acpi_ec_unblock_transactions_early(); |
a3627f67 | 264 | |
1da177e4 LT |
265 | local_irq_restore(flags); |
266 | printk(KERN_DEBUG "Back to C!\n"); | |
267 | ||
e9b3aba8 | 268 | /* restore processor state */ |
50ad147a | 269 | if (acpi_state == ACPI_STATE_S3) |
1da177e4 LT |
270 | acpi_restore_state_mem(); |
271 | ||
1da177e4 LT |
272 | return ACPI_SUCCESS(status) ? 0 : -EFAULT; |
273 | } | |
274 | ||
d5a64513 RW |
275 | static void acpi_suspend_finish(void) |
276 | { | |
fe955682 | 277 | acpi_ec_unblock_transactions(); |
d5a64513 RW |
278 | acpi_pm_finish(); |
279 | } | |
280 | ||
2c6e33c3 | 281 | static int acpi_suspend_state_valid(suspend_state_t pm_state) |
eb9289eb | 282 | { |
e8c9c502 | 283 | u32 acpi_state; |
eb9289eb | 284 | |
e8c9c502 JB |
285 | switch (pm_state) { |
286 | case PM_SUSPEND_ON: | |
287 | case PM_SUSPEND_STANDBY: | |
288 | case PM_SUSPEND_MEM: | |
289 | acpi_state = acpi_suspend_states[pm_state]; | |
290 | ||
291 | return sleep_states[acpi_state]; | |
292 | default: | |
293 | return 0; | |
294 | } | |
eb9289eb SL |
295 | } |
296 | ||
2c6e33c3 LB |
297 | static struct platform_suspend_ops acpi_suspend_ops = { |
298 | .valid = acpi_suspend_state_valid, | |
299 | .begin = acpi_suspend_begin, | |
6a7c7eaf | 300 | .prepare_late = acpi_pm_prepare, |
2c6e33c3 | 301 | .enter = acpi_suspend_enter, |
d5a64513 | 302 | .wake = acpi_suspend_finish, |
d8f3de0d RW |
303 | .end = acpi_pm_end, |
304 | }; | |
305 | ||
306 | /** | |
307 | * acpi_suspend_begin_old - Set the target system sleep state to the | |
308 | * state associated with given @pm_state, if supported, and | |
309 | * execute the _PTS control method. This function is used if the | |
310 | * pre-ACPI 2.0 suspend ordering has been requested. | |
311 | */ | |
312 | static int acpi_suspend_begin_old(suspend_state_t pm_state) | |
313 | { | |
314 | int error = acpi_suspend_begin(pm_state); | |
315 | ||
316 | if (!error) | |
317 | error = __acpi_pm_prepare(); | |
318 | return error; | |
319 | } | |
320 | ||
321 | /* | |
322 | * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has | |
323 | * been requested. | |
324 | */ | |
325 | static struct platform_suspend_ops acpi_suspend_ops_old = { | |
326 | .valid = acpi_suspend_state_valid, | |
327 | .begin = acpi_suspend_begin_old, | |
d5a64513 | 328 | .prepare_late = acpi_pm_freeze, |
2c6e33c3 | 329 | .enter = acpi_suspend_enter, |
d5a64513 | 330 | .wake = acpi_suspend_finish, |
d8f3de0d RW |
331 | .end = acpi_pm_end, |
332 | .recover = acpi_pm_finish, | |
1da177e4 | 333 | }; |
e41fb7c5 CC |
334 | |
335 | static int __init init_old_suspend_ordering(const struct dmi_system_id *d) | |
336 | { | |
337 | old_suspend_ordering = true; | |
338 | return 0; | |
339 | } | |
340 | ||
341 | static struct dmi_system_id __initdata acpisleep_dmi_table[] = { | |
342 | { | |
343 | .callback = init_old_suspend_ordering, | |
344 | .ident = "Abit KN9 (nForce4 variant)", | |
345 | .matches = { | |
346 | DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"), | |
347 | DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"), | |
348 | }, | |
349 | }, | |
4fb507b6 RW |
350 | { |
351 | .callback = init_old_suspend_ordering, | |
352 | .ident = "HP xw4600 Workstation", | |
353 | .matches = { | |
354 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
355 | DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"), | |
356 | }, | |
357 | }, | |
65df7847 | 358 | { |
a1404495 AW |
359 | .callback = init_old_suspend_ordering, |
360 | .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)", | |
361 | .matches = { | |
362 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."), | |
363 | DMI_MATCH(DMI_BOARD_NAME, "M2N8L"), | |
364 | }, | |
365 | }, | |
45e77988 | 366 | { |
2a9ef8e1 ZY |
367 | .callback = init_old_suspend_ordering, |
368 | .ident = "Panasonic CF51-2L", | |
369 | .matches = { | |
370 | DMI_MATCH(DMI_BOARD_VENDOR, | |
371 | "Matsushita Electric Industrial Co.,Ltd."), | |
372 | DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"), | |
373 | }, | |
374 | }, | |
e41fb7c5 CC |
375 | {}, |
376 | }; | |
296699de RW |
377 | #endif /* CONFIG_SUSPEND */ |
378 | ||
b0cb1a19 | 379 | #ifdef CONFIG_HIBERNATION |
5d8b532a RW |
380 | /* |
381 | * The ACPI specification wants us to save NVS memory regions during hibernation | |
382 | * and to restore them during the subsequent resume. However, it is not certain | |
383 | * if this mechanism is going to work on all machines, so we allow the user to | |
384 | * disable this mechanism using the 'acpi_sleep=s4_nonvs' kernel command line | |
385 | * option. | |
386 | */ | |
387 | static bool s4_no_nvs; | |
388 | ||
389 | void __init acpi_s4_no_nvs(void) | |
390 | { | |
391 | s4_no_nvs = true; | |
392 | } | |
393 | ||
bdfe6b7c SL |
394 | static unsigned long s4_hardware_signature; |
395 | static struct acpi_table_facs *facs; | |
396 | static bool nosigcheck; | |
397 | ||
398 | void __init acpi_no_s4_hw_signature(void) | |
399 | { | |
400 | nosigcheck = true; | |
401 | } | |
402 | ||
caea99ef | 403 | static int acpi_hibernation_begin(void) |
74f270af | 404 | { |
3f4b0ef7 RW |
405 | int error; |
406 | ||
ba84ed95 | 407 | error = s4_no_nvs ? 0 : hibernate_nvs_alloc(); |
3f4b0ef7 RW |
408 | if (!error) { |
409 | acpi_target_sleep_state = ACPI_STATE_S4; | |
410 | acpi_sleep_tts_switch(acpi_target_sleep_state); | |
411 | } | |
412 | ||
413 | return error; | |
414 | } | |
415 | ||
416 | static int acpi_hibernation_pre_snapshot(void) | |
417 | { | |
418 | int error = acpi_pm_prepare(); | |
419 | ||
420 | if (!error) | |
421 | hibernate_nvs_save(); | |
422 | ||
423 | return error; | |
74f270af RW |
424 | } |
425 | ||
a3d25c27 RW |
426 | static int acpi_hibernation_enter(void) |
427 | { | |
428 | acpi_status status = AE_OK; | |
429 | unsigned long flags = 0; | |
430 | ||
431 | ACPI_FLUSH_CPU_CACHE(); | |
432 | ||
433 | local_irq_save(flags); | |
434 | acpi_enable_wakeup_device(ACPI_STATE_S4); | |
435 | /* This shouldn't return. If it returns, we have a problem */ | |
436 | status = acpi_enter_sleep_state(ACPI_STATE_S4); | |
c95d47a8 RW |
437 | /* Reprogram control registers and execute _BFS */ |
438 | acpi_leave_sleep_state_prep(ACPI_STATE_S4); | |
a3d25c27 RW |
439 | local_irq_restore(flags); |
440 | ||
441 | return ACPI_SUCCESS(status) ? 0 : -EFAULT; | |
442 | } | |
443 | ||
3f4b0ef7 RW |
444 | static void acpi_hibernation_finish(void) |
445 | { | |
446 | hibernate_nvs_free(); | |
fe955682 | 447 | acpi_ec_unblock_transactions(); |
3f4b0ef7 RW |
448 | acpi_pm_finish(); |
449 | } | |
450 | ||
c7e0831d RW |
451 | static void acpi_hibernation_leave(void) |
452 | { | |
453 | /* | |
454 | * If ACPI is not enabled by the BIOS and the boot kernel, we need to | |
455 | * enable it here. | |
456 | */ | |
457 | acpi_enable(); | |
c95d47a8 RW |
458 | /* Reprogram control registers and execute _BFS */ |
459 | acpi_leave_sleep_state_prep(ACPI_STATE_S4); | |
bdfe6b7c SL |
460 | /* Check the hardware signature */ |
461 | if (facs && s4_hardware_signature != facs->hardware_signature) { | |
462 | printk(KERN_EMERG "ACPI: Hardware changed while hibernated, " | |
463 | "cannot resume!\n"); | |
464 | panic("ACPI S4 hardware signature mismatch"); | |
465 | } | |
3f4b0ef7 RW |
466 | /* Restore the NVS memory area */ |
467 | hibernate_nvs_restore(); | |
d5a64513 | 468 | /* Allow EC transactions to happen. */ |
fe955682 | 469 | acpi_ec_unblock_transactions_early(); |
c7e0831d RW |
470 | } |
471 | ||
d5a64513 | 472 | static void acpi_pm_thaw(void) |
f6bb13aa | 473 | { |
fe955682 | 474 | acpi_ec_unblock_transactions(); |
3d97e426 | 475 | acpi_enable_all_runtime_gpes(); |
a3d25c27 RW |
476 | } |
477 | ||
d8f3de0d RW |
478 | static struct platform_hibernation_ops acpi_hibernation_ops = { |
479 | .begin = acpi_hibernation_begin, | |
480 | .end = acpi_pm_end, | |
3f4b0ef7 RW |
481 | .pre_snapshot = acpi_hibernation_pre_snapshot, |
482 | .finish = acpi_hibernation_finish, | |
d8f3de0d RW |
483 | .prepare = acpi_pm_prepare, |
484 | .enter = acpi_hibernation_enter, | |
485 | .leave = acpi_hibernation_leave, | |
d5a64513 RW |
486 | .pre_restore = acpi_pm_freeze, |
487 | .restore_cleanup = acpi_pm_thaw, | |
d8f3de0d | 488 | }; |
caea99ef | 489 | |
d8f3de0d RW |
490 | /** |
491 | * acpi_hibernation_begin_old - Set the target system sleep state to | |
492 | * ACPI_STATE_S4 and execute the _PTS control method. This | |
493 | * function is used if the pre-ACPI 2.0 suspend ordering has been | |
494 | * requested. | |
495 | */ | |
496 | static int acpi_hibernation_begin_old(void) | |
a634cc10 | 497 | { |
e49f711c ZY |
498 | int error; |
499 | /* | |
500 | * The _TTS object should always be evaluated before the _PTS object. | |
501 | * When the old_suspended_ordering is true, the _PTS object is | |
502 | * evaluated in the acpi_sleep_prepare. | |
503 | */ | |
504 | acpi_sleep_tts_switch(ACPI_STATE_S4); | |
505 | ||
506 | error = acpi_sleep_prepare(ACPI_STATE_S4); | |
a634cc10 | 507 | |
3f4b0ef7 | 508 | if (!error) { |
ba84ed95 RW |
509 | if (!s4_no_nvs) |
510 | error = hibernate_nvs_alloc(); | |
3f4b0ef7 RW |
511 | if (!error) |
512 | acpi_target_sleep_state = ACPI_STATE_S4; | |
513 | } | |
514 | return error; | |
515 | } | |
516 | ||
517 | static int acpi_hibernation_pre_snapshot_old(void) | |
518 | { | |
d5a64513 RW |
519 | acpi_pm_freeze(); |
520 | hibernate_nvs_save(); | |
521 | return 0; | |
a634cc10 RW |
522 | } |
523 | ||
d8f3de0d RW |
524 | /* |
525 | * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has | |
526 | * been requested. | |
527 | */ | |
528 | static struct platform_hibernation_ops acpi_hibernation_ops_old = { | |
529 | .begin = acpi_hibernation_begin_old, | |
530 | .end = acpi_pm_end, | |
3f4b0ef7 RW |
531 | .pre_snapshot = acpi_hibernation_pre_snapshot_old, |
532 | .finish = acpi_hibernation_finish, | |
d5a64513 | 533 | .prepare = acpi_pm_freeze, |
a3d25c27 | 534 | .enter = acpi_hibernation_enter, |
c7e0831d | 535 | .leave = acpi_hibernation_leave, |
d5a64513 RW |
536 | .pre_restore = acpi_pm_freeze, |
537 | .restore_cleanup = acpi_pm_thaw, | |
d8f3de0d | 538 | .recover = acpi_pm_finish, |
a3d25c27 | 539 | }; |
d8f3de0d | 540 | #endif /* CONFIG_HIBERNATION */ |
a3d25c27 | 541 | |
296699de RW |
542 | int acpi_suspend(u32 acpi_state) |
543 | { | |
544 | suspend_state_t states[] = { | |
545 | [1] = PM_SUSPEND_STANDBY, | |
546 | [3] = PM_SUSPEND_MEM, | |
547 | [5] = PM_SUSPEND_MAX | |
548 | }; | |
549 | ||
550 | if (acpi_state < 6 && states[acpi_state]) | |
551 | return pm_suspend(states[acpi_state]); | |
552 | if (acpi_state == 4) | |
553 | return hibernate(); | |
554 | return -EINVAL; | |
555 | } | |
556 | ||
853298bc | 557 | #ifdef CONFIG_PM_SLEEP |
fd4aff1a SL |
558 | /** |
559 | * acpi_pm_device_sleep_state - return preferred power state of ACPI device | |
560 | * in the system sleep state given by %acpi_target_sleep_state | |
2fe2de5f DB |
561 | * @dev: device to examine; its driver model wakeup flags control |
562 | * whether it should be able to wake up the system | |
fd4aff1a SL |
563 | * @d_min_p: used to store the upper limit of allowed states range |
564 | * Return value: preferred power state of the device on success, -ENODEV on | |
565 | * failure (ie. if there's no 'struct acpi_device' for @dev) | |
566 | * | |
567 | * Find the lowest power (highest number) ACPI device power state that | |
568 | * device @dev can be in while the system is in the sleep state represented | |
569 | * by %acpi_target_sleep_state. If @wake is nonzero, the device should be | |
570 | * able to wake up the system from this sleep state. If @d_min_p is set, | |
571 | * the highest power (lowest number) device power state of @dev allowed | |
572 | * in this system sleep state is stored at the location pointed to by it. | |
573 | * | |
574 | * The caller must ensure that @dev is valid before using this function. | |
575 | * The caller is also responsible for figuring out if the device is | |
576 | * supposed to be able to wake up the system and passing this information | |
577 | * via @wake. | |
578 | */ | |
579 | ||
2fe2de5f | 580 | int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p) |
fd4aff1a SL |
581 | { |
582 | acpi_handle handle = DEVICE_ACPI_HANDLE(dev); | |
583 | struct acpi_device *adev; | |
584 | char acpi_method[] = "_SxD"; | |
27663c58 | 585 | unsigned long long d_min, d_max; |
fd4aff1a SL |
586 | |
587 | if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { | |
ead77594 | 588 | printk(KERN_DEBUG "ACPI handle has no context!\n"); |
fd4aff1a SL |
589 | return -ENODEV; |
590 | } | |
591 | ||
592 | acpi_method[2] = '0' + acpi_target_sleep_state; | |
593 | /* | |
594 | * If the sleep state is S0, we will return D3, but if the device has | |
595 | * _S0W, we will use the value from _S0W | |
596 | */ | |
597 | d_min = ACPI_STATE_D0; | |
598 | d_max = ACPI_STATE_D3; | |
599 | ||
600 | /* | |
601 | * If present, _SxD methods return the minimum D-state (highest power | |
602 | * state) we can use for the corresponding S-states. Otherwise, the | |
603 | * minimum D-state is D0 (ACPI 3.x). | |
604 | * | |
605 | * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer | |
606 | * provided -- that's our fault recovery, we ignore retval. | |
607 | */ | |
608 | if (acpi_target_sleep_state > ACPI_STATE_S0) | |
609 | acpi_evaluate_integer(handle, acpi_method, NULL, &d_min); | |
610 | ||
611 | /* | |
612 | * If _PRW says we can wake up the system from the target sleep state, | |
613 | * the D-state returned by _SxD is sufficient for that (we assume a | |
614 | * wakeup-aware driver if wake is set). Still, if _SxW exists | |
615 | * (ACPI 3.x), it should return the maximum (lowest power) D-state that | |
616 | * can wake the system. _S0W may be valid, too. | |
617 | */ | |
618 | if (acpi_target_sleep_state == ACPI_STATE_S0 || | |
2fe2de5f | 619 | (device_may_wakeup(dev) && adev->wakeup.state.enabled && |
fd4aff1a | 620 | adev->wakeup.sleep_state <= acpi_target_sleep_state)) { |
ad3399c3 RW |
621 | acpi_status status; |
622 | ||
fd4aff1a | 623 | acpi_method[3] = 'W'; |
ad3399c3 RW |
624 | status = acpi_evaluate_integer(handle, acpi_method, NULL, |
625 | &d_max); | |
626 | if (ACPI_FAILURE(status)) { | |
627 | d_max = d_min; | |
628 | } else if (d_max < d_min) { | |
629 | /* Warn the user of the broken DSDT */ | |
630 | printk(KERN_WARNING "ACPI: Wrong value from %s\n", | |
631 | acpi_method); | |
632 | /* Sanitize it */ | |
fd4aff1a | 633 | d_min = d_max; |
ad3399c3 | 634 | } |
fd4aff1a SL |
635 | } |
636 | ||
637 | if (d_min_p) | |
638 | *d_min_p = d_min; | |
639 | return d_max; | |
640 | } | |
eb9d0fe4 RW |
641 | |
642 | /** | |
643 | * acpi_pm_device_sleep_wake - enable or disable the system wake-up | |
644 | * capability of given device | |
645 | * @dev: device to handle | |
646 | * @enable: 'true' - enable, 'false' - disable the wake-up capability | |
647 | */ | |
648 | int acpi_pm_device_sleep_wake(struct device *dev, bool enable) | |
649 | { | |
650 | acpi_handle handle; | |
651 | struct acpi_device *adev; | |
df8db91f | 652 | int error; |
eb9d0fe4 | 653 | |
0baed8da | 654 | if (!device_can_wakeup(dev)) |
eb9d0fe4 RW |
655 | return -EINVAL; |
656 | ||
657 | handle = DEVICE_ACPI_HANDLE(dev); | |
658 | if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { | |
df8db91f | 659 | dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__); |
eb9d0fe4 RW |
660 | return -ENODEV; |
661 | } | |
662 | ||
9630bdd9 RW |
663 | if (enable) { |
664 | error = acpi_enable_wakeup_device_power(adev, | |
665 | acpi_target_sleep_state); | |
666 | if (!error) | |
667 | acpi_enable_gpe(adev->wakeup.gpe_device, | |
668 | adev->wakeup.gpe_number, | |
669 | ACPI_GPE_TYPE_WAKE); | |
670 | } else { | |
671 | acpi_disable_gpe(adev->wakeup.gpe_device, adev->wakeup.gpe_number, | |
672 | ACPI_GPE_TYPE_WAKE); | |
673 | error = acpi_disable_wakeup_device_power(adev); | |
674 | } | |
df8db91f RW |
675 | if (!error) |
676 | dev_info(dev, "wake-up capability %s by ACPI\n", | |
677 | enable ? "enabled" : "disabled"); | |
678 | ||
679 | return error; | |
eb9d0fe4 | 680 | } |
853298bc | 681 | #endif |
fd4aff1a | 682 | |
f216cc37 AS |
683 | static void acpi_power_off_prepare(void) |
684 | { | |
685 | /* Prepare to power off the system */ | |
686 | acpi_sleep_prepare(ACPI_STATE_S5); | |
3d97e426 | 687 | acpi_disable_all_gpes(); |
f216cc37 AS |
688 | } |
689 | ||
690 | static void acpi_power_off(void) | |
691 | { | |
692 | /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ | |
4d939155 | 693 | printk(KERN_DEBUG "%s called\n", __func__); |
f216cc37 | 694 | local_irq_disable(); |
9c1c6a1b | 695 | acpi_enable_wakeup_device(ACPI_STATE_S5); |
f216cc37 AS |
696 | acpi_enter_sleep_state(ACPI_STATE_S5); |
697 | } | |
698 | ||
96f15efc LB |
699 | /* |
700 | * ACPI 2.0 created the optional _GTS and _BFS, | |
701 | * but industry adoption has been neither rapid nor broad. | |
702 | * | |
703 | * Linux gets into trouble when it executes poorly validated | |
704 | * paths through the BIOS, so disable _GTS and _BFS by default, | |
705 | * but do speak up and offer the option to enable them. | |
706 | */ | |
707 | void __init acpi_gts_bfs_check(void) | |
708 | { | |
709 | acpi_handle dummy; | |
710 | ||
711 | if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy))) | |
712 | { | |
713 | printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n"); | |
714 | printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, " | |
715 | "please notify linux-acpi@vger.kernel.org\n"); | |
716 | } | |
717 | if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy))) | |
718 | { | |
719 | printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n"); | |
720 | printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, " | |
721 | "please notify linux-acpi@vger.kernel.org\n"); | |
722 | } | |
723 | } | |
724 | ||
aafbcd16 | 725 | int __init acpi_sleep_init(void) |
1da177e4 | 726 | { |
296699de RW |
727 | acpi_status status; |
728 | u8 type_a, type_b; | |
729 | #ifdef CONFIG_SUSPEND | |
e2a5b420 | 730 | int i = 0; |
e41fb7c5 CC |
731 | |
732 | dmi_check_system(acpisleep_dmi_table); | |
296699de | 733 | #endif |
1da177e4 LT |
734 | |
735 | if (acpi_disabled) | |
736 | return 0; | |
737 | ||
5a50fe70 FP |
738 | sleep_states[ACPI_STATE_S0] = 1; |
739 | printk(KERN_INFO PREFIX "(supports S0"); | |
740 | ||
296699de | 741 | #ifdef CONFIG_SUSPEND |
5a50fe70 | 742 | for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) { |
1da177e4 LT |
743 | status = acpi_get_sleep_type_data(i, &type_a, &type_b); |
744 | if (ACPI_SUCCESS(status)) { | |
745 | sleep_states[i] = 1; | |
746 | printk(" S%d", i); | |
747 | } | |
1da177e4 | 748 | } |
1da177e4 | 749 | |
d8f3de0d RW |
750 | suspend_set_ops(old_suspend_ordering ? |
751 | &acpi_suspend_ops_old : &acpi_suspend_ops); | |
296699de | 752 | #endif |
a3d25c27 | 753 | |
b0cb1a19 | 754 | #ifdef CONFIG_HIBERNATION |
296699de RW |
755 | status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b); |
756 | if (ACPI_SUCCESS(status)) { | |
d8f3de0d RW |
757 | hibernation_set_ops(old_suspend_ordering ? |
758 | &acpi_hibernation_ops_old : &acpi_hibernation_ops); | |
296699de | 759 | sleep_states[ACPI_STATE_S4] = 1; |
f216cc37 | 760 | printk(" S4"); |
bdfe6b7c | 761 | if (!nosigcheck) { |
3d97e426 | 762 | acpi_get_table(ACPI_SIG_FACS, 1, |
bdfe6b7c SL |
763 | (struct acpi_table_header **)&facs); |
764 | if (facs) | |
765 | s4_hardware_signature = | |
766 | facs->hardware_signature; | |
767 | } | |
296699de | 768 | } |
a3d25c27 | 769 | #endif |
f216cc37 AS |
770 | status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b); |
771 | if (ACPI_SUCCESS(status)) { | |
772 | sleep_states[ACPI_STATE_S5] = 1; | |
773 | printk(" S5"); | |
774 | pm_power_off_prepare = acpi_power_off_prepare; | |
775 | pm_power_off = acpi_power_off; | |
776 | } | |
777 | printk(")\n"); | |
e49f711c ZY |
778 | /* |
779 | * Register the tts_notifier to reboot notifier list so that the _TTS | |
780 | * object can also be evaluated when the system enters S5. | |
781 | */ | |
782 | register_reboot_notifier(&tts_notifier); | |
96f15efc | 783 | acpi_gts_bfs_check(); |
1da177e4 LT |
784 | return 0; |
785 | } |