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