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