Commit | Line | Data |
---|---|---|
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> | |
24 | #include "sleep.h" | |
25 | ||
26 | u8 sleep_states[ACPI_S_STATE_COUNT]; | |
27 | ||
e49f711c ZY |
28 | static void acpi_sleep_tts_switch(u32 acpi_state) |
29 | { | |
30 | union acpi_object in_arg = { ACPI_TYPE_INTEGER }; | |
31 | struct acpi_object_list arg_list = { 1, &in_arg }; | |
32 | acpi_status status = AE_OK; | |
33 | ||
34 | in_arg.integer.value = acpi_state; | |
35 | status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL); | |
36 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
37 | /* | |
38 | * OS can't evaluate the _TTS object correctly. Some warning | |
39 | * message will be printed. But it won't break anything. | |
40 | */ | |
41 | printk(KERN_NOTICE "Failure in evaluating _TTS object\n"); | |
42 | } | |
43 | } | |
44 | ||
45 | static int tts_notify_reboot(struct notifier_block *this, | |
46 | unsigned long code, void *x) | |
47 | { | |
48 | acpi_sleep_tts_switch(ACPI_STATE_S5); | |
49 | return NOTIFY_DONE; | |
50 | } | |
51 | ||
52 | static struct notifier_block tts_notifier = { | |
53 | .notifier_call = tts_notify_reboot, | |
54 | .next = NULL, | |
55 | .priority = 0, | |
56 | }; | |
57 | ||
c9b6c8f6 | 58 | static int acpi_sleep_prepare(u32 acpi_state) |
2f3f2226 AS |
59 | { |
60 | #ifdef CONFIG_ACPI_SLEEP | |
61 | /* do we have a wakeup address for S2 and S3? */ | |
62 | if (acpi_state == ACPI_STATE_S3) { | |
63 | if (!acpi_wakeup_address) { | |
64 | return -EFAULT; | |
65 | } | |
4b4f7280 PA |
66 | acpi_set_firmware_waking_vector( |
67 | (acpi_physical_address)acpi_wakeup_address); | |
2f3f2226 AS |
68 | |
69 | } | |
70 | ACPI_FLUSH_CPU_CACHE(); | |
71 | acpi_enable_wakeup_device_prep(acpi_state); | |
72 | #endif | |
c9b6c8f6 RW |
73 | printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n", |
74 | acpi_state); | |
2f3f2226 AS |
75 | acpi_enter_sleep_state_prep(acpi_state); |
76 | return 0; | |
77 | } | |
78 | ||
5d1e072b | 79 | #ifdef CONFIG_ACPI_SLEEP |
b849075c | 80 | static u32 acpi_target_sleep_state = ACPI_STATE_S0; |
d8f3de0d RW |
81 | /* |
82 | * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the | |
83 | * user to request that behavior by using the 'acpi_old_suspend_ordering' | |
84 | * kernel command line option that causes the following variable to be set. | |
85 | */ | |
86 | static bool old_suspend_ordering; | |
87 | ||
88 | void __init acpi_old_suspend_ordering(void) | |
89 | { | |
90 | old_suspend_ordering = true; | |
91 | } | |
92 | ||
65df7847 RW |
93 | /* |
94 | * According to the ACPI specification the BIOS should make sure that ACPI is | |
95 | * enabled and SCI_EN bit is set on wake-up from S1 - S3 sleep states. Still, | |
96 | * some BIOSes don't do that and therefore we use acpi_enable() to enable ACPI | |
97 | * on such systems during resume. Unfortunately that doesn't help in | |
98 | * particularly pathological cases in which SCI_EN has to be set directly on | |
99 | * resume, although the specification states very clearly that this flag is | |
100 | * owned by the hardware. The set_sci_en_on_resume variable will be set in such | |
101 | * cases. | |
102 | */ | |
103 | static bool set_sci_en_on_resume; | |
104 | ||
d8f3de0d RW |
105 | /** |
106 | * acpi_pm_disable_gpes - Disable the GPEs. | |
107 | */ | |
108 | static int acpi_pm_disable_gpes(void) | |
109 | { | |
110 | acpi_hw_disable_all_gpes(); | |
111 | return 0; | |
112 | } | |
113 | ||
114 | /** | |
115 | * __acpi_pm_prepare - Prepare the platform to enter the target state. | |
116 | * | |
117 | * If necessary, set the firmware waking vector and do arch-specific | |
118 | * nastiness to get the wakeup code to the waking vector. | |
119 | */ | |
120 | static int __acpi_pm_prepare(void) | |
121 | { | |
122 | int error = acpi_sleep_prepare(acpi_target_sleep_state); | |
123 | ||
124 | if (error) | |
125 | acpi_target_sleep_state = ACPI_STATE_S0; | |
126 | return error; | |
127 | } | |
128 | ||
129 | /** | |
130 | * acpi_pm_prepare - Prepare the platform to enter the target sleep | |
131 | * state and disable the GPEs. | |
132 | */ | |
133 | static int acpi_pm_prepare(void) | |
134 | { | |
135 | int error = __acpi_pm_prepare(); | |
136 | ||
137 | if (!error) | |
138 | acpi_hw_disable_all_gpes(); | |
139 | return error; | |
140 | } | |
141 | ||
142 | /** | |
143 | * acpi_pm_finish - Instruct the platform to leave a sleep state. | |
144 | * | |
145 | * This is called after we wake back up (or if entering the sleep state | |
146 | * failed). | |
147 | */ | |
148 | static void acpi_pm_finish(void) | |
149 | { | |
150 | u32 acpi_state = acpi_target_sleep_state; | |
151 | ||
152 | if (acpi_state == ACPI_STATE_S0) | |
153 | return; | |
1da177e4 | 154 | |
d8f3de0d RW |
155 | printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n", |
156 | acpi_state); | |
157 | acpi_disable_wakeup_device(acpi_state); | |
158 | acpi_leave_sleep_state(acpi_state); | |
159 | ||
160 | /* reset firmware waking vector */ | |
161 | acpi_set_firmware_waking_vector((acpi_physical_address) 0); | |
162 | ||
163 | acpi_target_sleep_state = ACPI_STATE_S0; | |
164 | } | |
165 | ||
166 | /** | |
167 | * acpi_pm_end - Finish up suspend sequence. | |
168 | */ | |
169 | static void acpi_pm_end(void) | |
170 | { | |
171 | /* | |
172 | * This is necessary in case acpi_pm_finish() is not called during a | |
173 | * failing transition to a sleep state. | |
174 | */ | |
175 | acpi_target_sleep_state = ACPI_STATE_S0; | |
e49f711c | 176 | acpi_sleep_tts_switch(acpi_target_sleep_state); |
d8f3de0d | 177 | } |
92daa7b5 RW |
178 | #else /* !CONFIG_ACPI_SLEEP */ |
179 | #define acpi_target_sleep_state ACPI_STATE_S0 | |
5d1e072b | 180 | #endif /* CONFIG_ACPI_SLEEP */ |
1da177e4 | 181 | |
d8f3de0d | 182 | #ifdef CONFIG_SUSPEND |
1da177e4 LT |
183 | extern void do_suspend_lowlevel(void); |
184 | ||
185 | static u32 acpi_suspend_states[] = { | |
e2a5b420 AS |
186 | [PM_SUSPEND_ON] = ACPI_STATE_S0, |
187 | [PM_SUSPEND_STANDBY] = ACPI_STATE_S1, | |
188 | [PM_SUSPEND_MEM] = ACPI_STATE_S3, | |
e2a5b420 | 189 | [PM_SUSPEND_MAX] = ACPI_STATE_S5 |
1da177e4 LT |
190 | }; |
191 | ||
e9b3aba8 | 192 | /** |
2c6e33c3 | 193 | * acpi_suspend_begin - Set the target system sleep state to the state |
e9b3aba8 RW |
194 | * associated with given @pm_state, if supported. |
195 | */ | |
2c6e33c3 | 196 | static int acpi_suspend_begin(suspend_state_t pm_state) |
e9b3aba8 RW |
197 | { |
198 | u32 acpi_state = acpi_suspend_states[pm_state]; | |
199 | int error = 0; | |
200 | ||
201 | if (sleep_states[acpi_state]) { | |
202 | acpi_target_sleep_state = acpi_state; | |
e49f711c | 203 | acpi_sleep_tts_switch(acpi_target_sleep_state); |
e9b3aba8 RW |
204 | } else { |
205 | printk(KERN_ERR "ACPI does not support this state: %d\n", | |
206 | pm_state); | |
207 | error = -ENOSYS; | |
208 | } | |
209 | return error; | |
210 | } | |
211 | ||
1da177e4 | 212 | /** |
2c6e33c3 | 213 | * acpi_suspend_enter - Actually enter a sleep state. |
e9b3aba8 | 214 | * @pm_state: ignored |
1da177e4 | 215 | * |
50ad147a RW |
216 | * Flush caches and go to sleep. For STR we have to call arch-specific |
217 | * assembly, which in turn call acpi_enter_sleep_state(). | |
1da177e4 LT |
218 | * It's unfortunate, but it works. Please fix if you're feeling frisky. |
219 | */ | |
2c6e33c3 | 220 | static int acpi_suspend_enter(suspend_state_t pm_state) |
1da177e4 LT |
221 | { |
222 | acpi_status status = AE_OK; | |
223 | unsigned long flags = 0; | |
e9b3aba8 | 224 | u32 acpi_state = acpi_target_sleep_state; |
1da177e4 LT |
225 | |
226 | ACPI_FLUSH_CPU_CACHE(); | |
227 | ||
228 | /* Do arch specific saving of state. */ | |
50ad147a | 229 | if (acpi_state == ACPI_STATE_S3) { |
1da177e4 | 230 | int error = acpi_save_state_mem(); |
e9b3aba8 | 231 | |
60417f59 | 232 | if (error) |
1da177e4 LT |
233 | return error; |
234 | } | |
235 | ||
1da177e4 LT |
236 | local_irq_save(flags); |
237 | acpi_enable_wakeup_device(acpi_state); | |
e9b3aba8 RW |
238 | switch (acpi_state) { |
239 | case ACPI_STATE_S1: | |
1da177e4 LT |
240 | barrier(); |
241 | status = acpi_enter_sleep_state(acpi_state); | |
242 | break; | |
243 | ||
e9b3aba8 | 244 | case ACPI_STATE_S3: |
1da177e4 LT |
245 | do_suspend_lowlevel(); |
246 | break; | |
1da177e4 | 247 | } |
872d83d0 | 248 | |
d0c71fe7 | 249 | /* If ACPI is not enabled by the BIOS, we need to enable it here. */ |
65df7847 RW |
250 | if (set_sci_en_on_resume) |
251 | acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1); | |
252 | else | |
253 | acpi_enable(); | |
254 | ||
c95d47a8 RW |
255 | /* Reprogram control registers and execute _BFS */ |
256 | acpi_leave_sleep_state_prep(acpi_state); | |
257 | ||
23b168d4 | 258 | /* ACPI 3.0 specs (P62) says that it's the responsibility |
872d83d0 AP |
259 | * of the OSPM to clear the status bit [ implying that the |
260 | * POWER_BUTTON event should not reach userspace ] | |
261 | */ | |
262 | if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) | |
263 | acpi_clear_event(ACPI_EVENT_POWER_BUTTON); | |
264 | ||
a3627f67 SL |
265 | /* |
266 | * Disable and clear GPE status before interrupt is enabled. Some GPEs | |
267 | * (like wakeup GPE) haven't handler, this can avoid such GPE misfire. | |
268 | * acpi_leave_sleep_state will reenable specific GPEs later | |
269 | */ | |
270 | acpi_hw_disable_all_gpes(); | |
271 | ||
1da177e4 LT |
272 | local_irq_restore(flags); |
273 | printk(KERN_DEBUG "Back to C!\n"); | |
274 | ||
e9b3aba8 | 275 | /* restore processor state */ |
50ad147a | 276 | if (acpi_state == ACPI_STATE_S3) |
1da177e4 LT |
277 | acpi_restore_state_mem(); |
278 | ||
1da177e4 LT |
279 | return ACPI_SUCCESS(status) ? 0 : -EFAULT; |
280 | } | |
281 | ||
2c6e33c3 | 282 | static int acpi_suspend_state_valid(suspend_state_t pm_state) |
eb9289eb | 283 | { |
e8c9c502 | 284 | u32 acpi_state; |
eb9289eb | 285 | |
e8c9c502 JB |
286 | switch (pm_state) { |
287 | case PM_SUSPEND_ON: | |
288 | case PM_SUSPEND_STANDBY: | |
289 | case PM_SUSPEND_MEM: | |
290 | acpi_state = acpi_suspend_states[pm_state]; | |
291 | ||
292 | return sleep_states[acpi_state]; | |
293 | default: | |
294 | return 0; | |
295 | } | |
eb9289eb SL |
296 | } |
297 | ||
2c6e33c3 LB |
298 | static struct platform_suspend_ops acpi_suspend_ops = { |
299 | .valid = acpi_suspend_state_valid, | |
300 | .begin = acpi_suspend_begin, | |
d8f3de0d | 301 | .prepare = acpi_pm_prepare, |
2c6e33c3 | 302 | .enter = acpi_suspend_enter, |
d8f3de0d RW |
303 | .finish = acpi_pm_finish, |
304 | .end = acpi_pm_end, | |
305 | }; | |
306 | ||
307 | /** | |
308 | * acpi_suspend_begin_old - Set the target system sleep state to the | |
309 | * state associated with given @pm_state, if supported, and | |
310 | * execute the _PTS control method. This function is used if the | |
311 | * pre-ACPI 2.0 suspend ordering has been requested. | |
312 | */ | |
313 | static int acpi_suspend_begin_old(suspend_state_t pm_state) | |
314 | { | |
315 | int error = acpi_suspend_begin(pm_state); | |
316 | ||
317 | if (!error) | |
318 | error = __acpi_pm_prepare(); | |
319 | return error; | |
320 | } | |
321 | ||
322 | /* | |
323 | * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has | |
324 | * been requested. | |
325 | */ | |
326 | static struct platform_suspend_ops acpi_suspend_ops_old = { | |
327 | .valid = acpi_suspend_state_valid, | |
328 | .begin = acpi_suspend_begin_old, | |
329 | .prepare = acpi_pm_disable_gpes, | |
2c6e33c3 | 330 | .enter = acpi_suspend_enter, |
d8f3de0d RW |
331 | .finish = acpi_pm_finish, |
332 | .end = acpi_pm_end, | |
333 | .recover = acpi_pm_finish, | |
1da177e4 | 334 | }; |
e41fb7c5 CC |
335 | |
336 | static int __init init_old_suspend_ordering(const struct dmi_system_id *d) | |
337 | { | |
338 | old_suspend_ordering = true; | |
339 | return 0; | |
340 | } | |
341 | ||
65df7847 RW |
342 | static int __init init_set_sci_en_on_resume(const struct dmi_system_id *d) |
343 | { | |
344 | set_sci_en_on_resume = true; | |
345 | return 0; | |
346 | } | |
347 | ||
e41fb7c5 CC |
348 | static struct dmi_system_id __initdata acpisleep_dmi_table[] = { |
349 | { | |
350 | .callback = init_old_suspend_ordering, | |
351 | .ident = "Abit KN9 (nForce4 variant)", | |
352 | .matches = { | |
353 | DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"), | |
354 | DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"), | |
355 | }, | |
356 | }, | |
4fb507b6 RW |
357 | { |
358 | .callback = init_old_suspend_ordering, | |
359 | .ident = "HP xw4600 Workstation", | |
360 | .matches = { | |
361 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
362 | DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"), | |
363 | }, | |
364 | }, | |
65df7847 RW |
365 | { |
366 | .callback = init_set_sci_en_on_resume, | |
367 | .ident = "Apple MacBook 1,1", | |
368 | .matches = { | |
369 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."), | |
370 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBook1,1"), | |
371 | }, | |
372 | }, | |
373 | { | |
374 | .callback = init_set_sci_en_on_resume, | |
375 | .ident = "Apple MacMini 1,1", | |
376 | .matches = { | |
377 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."), | |
378 | DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"), | |
379 | }, | |
380 | }, | |
e41fb7c5 CC |
381 | {}, |
382 | }; | |
296699de RW |
383 | #endif /* CONFIG_SUSPEND */ |
384 | ||
b0cb1a19 | 385 | #ifdef CONFIG_HIBERNATION |
bdfe6b7c SL |
386 | static unsigned long s4_hardware_signature; |
387 | static struct acpi_table_facs *facs; | |
388 | static bool nosigcheck; | |
389 | ||
390 | void __init acpi_no_s4_hw_signature(void) | |
391 | { | |
392 | nosigcheck = true; | |
393 | } | |
394 | ||
caea99ef | 395 | static int acpi_hibernation_begin(void) |
74f270af RW |
396 | { |
397 | acpi_target_sleep_state = ACPI_STATE_S4; | |
e49f711c | 398 | acpi_sleep_tts_switch(acpi_target_sleep_state); |
7731ce63 | 399 | return 0; |
74f270af RW |
400 | } |
401 | ||
a3d25c27 RW |
402 | static int acpi_hibernation_enter(void) |
403 | { | |
404 | acpi_status status = AE_OK; | |
405 | unsigned long flags = 0; | |
406 | ||
407 | ACPI_FLUSH_CPU_CACHE(); | |
408 | ||
409 | local_irq_save(flags); | |
410 | acpi_enable_wakeup_device(ACPI_STATE_S4); | |
411 | /* This shouldn't return. If it returns, we have a problem */ | |
412 | status = acpi_enter_sleep_state(ACPI_STATE_S4); | |
c95d47a8 RW |
413 | /* Reprogram control registers and execute _BFS */ |
414 | acpi_leave_sleep_state_prep(ACPI_STATE_S4); | |
a3d25c27 RW |
415 | local_irq_restore(flags); |
416 | ||
417 | return ACPI_SUCCESS(status) ? 0 : -EFAULT; | |
418 | } | |
419 | ||
c7e0831d RW |
420 | static void acpi_hibernation_leave(void) |
421 | { | |
422 | /* | |
423 | * If ACPI is not enabled by the BIOS and the boot kernel, we need to | |
424 | * enable it here. | |
425 | */ | |
426 | acpi_enable(); | |
c95d47a8 RW |
427 | /* Reprogram control registers and execute _BFS */ |
428 | acpi_leave_sleep_state_prep(ACPI_STATE_S4); | |
bdfe6b7c SL |
429 | /* Check the hardware signature */ |
430 | if (facs && s4_hardware_signature != facs->hardware_signature) { | |
431 | printk(KERN_EMERG "ACPI: Hardware changed while hibernated, " | |
432 | "cannot resume!\n"); | |
433 | panic("ACPI S4 hardware signature mismatch"); | |
434 | } | |
c7e0831d RW |
435 | } |
436 | ||
d8f3de0d | 437 | static void acpi_pm_enable_gpes(void) |
a3d25c27 | 438 | { |
d8f3de0d | 439 | acpi_hw_enable_all_runtime_gpes(); |
a3d25c27 RW |
440 | } |
441 | ||
d8f3de0d RW |
442 | static struct platform_hibernation_ops acpi_hibernation_ops = { |
443 | .begin = acpi_hibernation_begin, | |
444 | .end = acpi_pm_end, | |
445 | .pre_snapshot = acpi_pm_prepare, | |
446 | .finish = acpi_pm_finish, | |
447 | .prepare = acpi_pm_prepare, | |
448 | .enter = acpi_hibernation_enter, | |
449 | .leave = acpi_hibernation_leave, | |
450 | .pre_restore = acpi_pm_disable_gpes, | |
451 | .restore_cleanup = acpi_pm_enable_gpes, | |
452 | }; | |
caea99ef | 453 | |
d8f3de0d RW |
454 | /** |
455 | * acpi_hibernation_begin_old - Set the target system sleep state to | |
456 | * ACPI_STATE_S4 and execute the _PTS control method. This | |
457 | * function is used if the pre-ACPI 2.0 suspend ordering has been | |
458 | * requested. | |
459 | */ | |
460 | static int acpi_hibernation_begin_old(void) | |
a634cc10 | 461 | { |
e49f711c ZY |
462 | int error; |
463 | /* | |
464 | * The _TTS object should always be evaluated before the _PTS object. | |
465 | * When the old_suspended_ordering is true, the _PTS object is | |
466 | * evaluated in the acpi_sleep_prepare. | |
467 | */ | |
468 | acpi_sleep_tts_switch(ACPI_STATE_S4); | |
469 | ||
470 | error = acpi_sleep_prepare(ACPI_STATE_S4); | |
a634cc10 | 471 | |
d8f3de0d RW |
472 | if (!error) |
473 | acpi_target_sleep_state = ACPI_STATE_S4; | |
474 | return error; | |
a634cc10 RW |
475 | } |
476 | ||
d8f3de0d RW |
477 | /* |
478 | * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has | |
479 | * been requested. | |
480 | */ | |
481 | static struct platform_hibernation_ops acpi_hibernation_ops_old = { | |
482 | .begin = acpi_hibernation_begin_old, | |
483 | .end = acpi_pm_end, | |
484 | .pre_snapshot = acpi_pm_disable_gpes, | |
485 | .finish = acpi_pm_finish, | |
486 | .prepare = acpi_pm_disable_gpes, | |
a3d25c27 | 487 | .enter = acpi_hibernation_enter, |
c7e0831d | 488 | .leave = acpi_hibernation_leave, |
d8f3de0d RW |
489 | .pre_restore = acpi_pm_disable_gpes, |
490 | .restore_cleanup = acpi_pm_enable_gpes, | |
491 | .recover = acpi_pm_finish, | |
a3d25c27 | 492 | }; |
d8f3de0d | 493 | #endif /* CONFIG_HIBERNATION */ |
a3d25c27 | 494 | |
296699de RW |
495 | int acpi_suspend(u32 acpi_state) |
496 | { | |
497 | suspend_state_t states[] = { | |
498 | [1] = PM_SUSPEND_STANDBY, | |
499 | [3] = PM_SUSPEND_MEM, | |
500 | [5] = PM_SUSPEND_MAX | |
501 | }; | |
502 | ||
503 | if (acpi_state < 6 && states[acpi_state]) | |
504 | return pm_suspend(states[acpi_state]); | |
505 | if (acpi_state == 4) | |
506 | return hibernate(); | |
507 | return -EINVAL; | |
508 | } | |
509 | ||
853298bc | 510 | #ifdef CONFIG_PM_SLEEP |
fd4aff1a SL |
511 | /** |
512 | * acpi_pm_device_sleep_state - return preferred power state of ACPI device | |
513 | * in the system sleep state given by %acpi_target_sleep_state | |
2fe2de5f DB |
514 | * @dev: device to examine; its driver model wakeup flags control |
515 | * whether it should be able to wake up the system | |
fd4aff1a SL |
516 | * @d_min_p: used to store the upper limit of allowed states range |
517 | * Return value: preferred power state of the device on success, -ENODEV on | |
518 | * failure (ie. if there's no 'struct acpi_device' for @dev) | |
519 | * | |
520 | * Find the lowest power (highest number) ACPI device power state that | |
521 | * device @dev can be in while the system is in the sleep state represented | |
522 | * by %acpi_target_sleep_state. If @wake is nonzero, the device should be | |
523 | * able to wake up the system from this sleep state. If @d_min_p is set, | |
524 | * the highest power (lowest number) device power state of @dev allowed | |
525 | * in this system sleep state is stored at the location pointed to by it. | |
526 | * | |
527 | * The caller must ensure that @dev is valid before using this function. | |
528 | * The caller is also responsible for figuring out if the device is | |
529 | * supposed to be able to wake up the system and passing this information | |
530 | * via @wake. | |
531 | */ | |
532 | ||
2fe2de5f | 533 | int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p) |
fd4aff1a SL |
534 | { |
535 | acpi_handle handle = DEVICE_ACPI_HANDLE(dev); | |
536 | struct acpi_device *adev; | |
537 | char acpi_method[] = "_SxD"; | |
27663c58 | 538 | unsigned long long d_min, d_max; |
fd4aff1a SL |
539 | |
540 | if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { | |
ead77594 | 541 | printk(KERN_DEBUG "ACPI handle has no context!\n"); |
fd4aff1a SL |
542 | return -ENODEV; |
543 | } | |
544 | ||
545 | acpi_method[2] = '0' + acpi_target_sleep_state; | |
546 | /* | |
547 | * If the sleep state is S0, we will return D3, but if the device has | |
548 | * _S0W, we will use the value from _S0W | |
549 | */ | |
550 | d_min = ACPI_STATE_D0; | |
551 | d_max = ACPI_STATE_D3; | |
552 | ||
553 | /* | |
554 | * If present, _SxD methods return the minimum D-state (highest power | |
555 | * state) we can use for the corresponding S-states. Otherwise, the | |
556 | * minimum D-state is D0 (ACPI 3.x). | |
557 | * | |
558 | * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer | |
559 | * provided -- that's our fault recovery, we ignore retval. | |
560 | */ | |
561 | if (acpi_target_sleep_state > ACPI_STATE_S0) | |
562 | acpi_evaluate_integer(handle, acpi_method, NULL, &d_min); | |
563 | ||
564 | /* | |
565 | * If _PRW says we can wake up the system from the target sleep state, | |
566 | * the D-state returned by _SxD is sufficient for that (we assume a | |
567 | * wakeup-aware driver if wake is set). Still, if _SxW exists | |
568 | * (ACPI 3.x), it should return the maximum (lowest power) D-state that | |
569 | * can wake the system. _S0W may be valid, too. | |
570 | */ | |
571 | if (acpi_target_sleep_state == ACPI_STATE_S0 || | |
2fe2de5f | 572 | (device_may_wakeup(dev) && adev->wakeup.state.enabled && |
fd4aff1a | 573 | adev->wakeup.sleep_state <= acpi_target_sleep_state)) { |
ad3399c3 RW |
574 | acpi_status status; |
575 | ||
fd4aff1a | 576 | acpi_method[3] = 'W'; |
ad3399c3 RW |
577 | status = acpi_evaluate_integer(handle, acpi_method, NULL, |
578 | &d_max); | |
579 | if (ACPI_FAILURE(status)) { | |
580 | d_max = d_min; | |
581 | } else if (d_max < d_min) { | |
582 | /* Warn the user of the broken DSDT */ | |
583 | printk(KERN_WARNING "ACPI: Wrong value from %s\n", | |
584 | acpi_method); | |
585 | /* Sanitize it */ | |
fd4aff1a | 586 | d_min = d_max; |
ad3399c3 | 587 | } |
fd4aff1a SL |
588 | } |
589 | ||
590 | if (d_min_p) | |
591 | *d_min_p = d_min; | |
592 | return d_max; | |
593 | } | |
eb9d0fe4 RW |
594 | |
595 | /** | |
596 | * acpi_pm_device_sleep_wake - enable or disable the system wake-up | |
597 | * capability of given device | |
598 | * @dev: device to handle | |
599 | * @enable: 'true' - enable, 'false' - disable the wake-up capability | |
600 | */ | |
601 | int acpi_pm_device_sleep_wake(struct device *dev, bool enable) | |
602 | { | |
603 | acpi_handle handle; | |
604 | struct acpi_device *adev; | |
605 | ||
606 | if (!device_may_wakeup(dev)) | |
607 | return -EINVAL; | |
608 | ||
609 | handle = DEVICE_ACPI_HANDLE(dev); | |
610 | if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { | |
611 | printk(KERN_DEBUG "ACPI handle has no context!\n"); | |
612 | return -ENODEV; | |
613 | } | |
614 | ||
615 | return enable ? | |
616 | acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) : | |
617 | acpi_disable_wakeup_device_power(adev); | |
618 | } | |
853298bc | 619 | #endif |
fd4aff1a | 620 | |
f216cc37 AS |
621 | static void acpi_power_off_prepare(void) |
622 | { | |
623 | /* Prepare to power off the system */ | |
624 | acpi_sleep_prepare(ACPI_STATE_S5); | |
3c1d2b60 | 625 | acpi_hw_disable_all_gpes(); |
f216cc37 AS |
626 | } |
627 | ||
628 | static void acpi_power_off(void) | |
629 | { | |
630 | /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ | |
96b2dd1f | 631 | printk("%s called\n", __func__); |
f216cc37 | 632 | local_irq_disable(); |
9c1c6a1b | 633 | acpi_enable_wakeup_device(ACPI_STATE_S5); |
f216cc37 AS |
634 | acpi_enter_sleep_state(ACPI_STATE_S5); |
635 | } | |
636 | ||
aafbcd16 | 637 | int __init acpi_sleep_init(void) |
1da177e4 | 638 | { |
296699de RW |
639 | acpi_status status; |
640 | u8 type_a, type_b; | |
641 | #ifdef CONFIG_SUSPEND | |
e2a5b420 | 642 | int i = 0; |
e41fb7c5 CC |
643 | |
644 | dmi_check_system(acpisleep_dmi_table); | |
296699de | 645 | #endif |
1da177e4 LT |
646 | |
647 | if (acpi_disabled) | |
648 | return 0; | |
649 | ||
5a50fe70 FP |
650 | sleep_states[ACPI_STATE_S0] = 1; |
651 | printk(KERN_INFO PREFIX "(supports S0"); | |
652 | ||
296699de | 653 | #ifdef CONFIG_SUSPEND |
5a50fe70 | 654 | for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) { |
1da177e4 LT |
655 | status = acpi_get_sleep_type_data(i, &type_a, &type_b); |
656 | if (ACPI_SUCCESS(status)) { | |
657 | sleep_states[i] = 1; | |
658 | printk(" S%d", i); | |
659 | } | |
1da177e4 | 660 | } |
1da177e4 | 661 | |
d8f3de0d RW |
662 | suspend_set_ops(old_suspend_ordering ? |
663 | &acpi_suspend_ops_old : &acpi_suspend_ops); | |
296699de | 664 | #endif |
a3d25c27 | 665 | |
b0cb1a19 | 666 | #ifdef CONFIG_HIBERNATION |
296699de RW |
667 | status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b); |
668 | if (ACPI_SUCCESS(status)) { | |
d8f3de0d RW |
669 | hibernation_set_ops(old_suspend_ordering ? |
670 | &acpi_hibernation_ops_old : &acpi_hibernation_ops); | |
296699de | 671 | sleep_states[ACPI_STATE_S4] = 1; |
f216cc37 | 672 | printk(" S4"); |
bdfe6b7c SL |
673 | if (!nosigcheck) { |
674 | acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS, | |
675 | (struct acpi_table_header **)&facs); | |
676 | if (facs) | |
677 | s4_hardware_signature = | |
678 | facs->hardware_signature; | |
679 | } | |
296699de | 680 | } |
a3d25c27 | 681 | #endif |
f216cc37 AS |
682 | status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b); |
683 | if (ACPI_SUCCESS(status)) { | |
684 | sleep_states[ACPI_STATE_S5] = 1; | |
685 | printk(" S5"); | |
686 | pm_power_off_prepare = acpi_power_off_prepare; | |
687 | pm_power_off = acpi_power_off; | |
688 | } | |
689 | printk(")\n"); | |
e49f711c ZY |
690 | /* |
691 | * Register the tts_notifier to reboot notifier list so that the _TTS | |
692 | * object can also be evaluated when the system enters S5. | |
693 | */ | |
694 | register_reboot_notifier(&tts_notifier); | |
1da177e4 LT |
695 | return 0; |
696 | } |