blob: d13194a031bfbe0d1f9de3c83cd25471c10eda7a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * sleep.c - ACPI sleep support.
3 *
Alexey Starikovskiye2a5b422005-03-18 16:20:46 -05004 * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 * 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>
Alexey Starikovskiyf216cc32007-09-20 21:32:35 +040018
19#include <asm/io.h>
20
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <acpi/acpi_bus.h>
22#include <acpi/acpi_drivers.h>
23#include "sleep.h"
24
25u8 sleep_states[ACPI_S_STATE_COUNT];
26
Rafael J. Wysockic9b6c8f2008-01-08 00:10:57 +010027static int acpi_sleep_prepare(u32 acpi_state)
Alexey Starikovskiy2f3f22262007-09-24 14:33:21 +020028{
29#ifdef CONFIG_ACPI_SLEEP
30 /* do we have a wakeup address for S2 and S3? */
31 if (acpi_state == ACPI_STATE_S3) {
32 if (!acpi_wakeup_address) {
33 return -EFAULT;
34 }
H. Peter Anvin4b4f7282008-06-24 23:03:48 +020035 acpi_set_firmware_waking_vector(
36 (acpi_physical_address)acpi_wakeup_address);
Alexey Starikovskiy2f3f22262007-09-24 14:33:21 +020037
38 }
39 ACPI_FLUSH_CPU_CACHE();
40 acpi_enable_wakeup_device_prep(acpi_state);
41#endif
Rafael J. Wysockic9b6c8f2008-01-08 00:10:57 +010042 printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
43 acpi_state);
Alexey Starikovskiy2f3f22262007-09-24 14:33:21 +020044 acpi_enter_sleep_state_prep(acpi_state);
45 return 0;
46}
47
Rafael J. Wysockid8f3de02008-06-12 23:24:06 +020048#ifdef CONFIG_PM_SLEEP
49static u32 acpi_target_sleep_state = ACPI_STATE_S0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
Rafael J. Wysockid8f3de02008-06-12 23:24:06 +020051/*
52 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
53 * user to request that behavior by using the 'acpi_old_suspend_ordering'
54 * kernel command line option that causes the following variable to be set.
55 */
56static bool old_suspend_ordering;
57
58void __init acpi_old_suspend_ordering(void)
59{
60 old_suspend_ordering = true;
61}
62
63/**
64 * acpi_pm_disable_gpes - Disable the GPEs.
65 */
66static int acpi_pm_disable_gpes(void)
67{
68 acpi_hw_disable_all_gpes();
69 return 0;
70}
71
72/**
73 * __acpi_pm_prepare - Prepare the platform to enter the target state.
74 *
75 * If necessary, set the firmware waking vector and do arch-specific
76 * nastiness to get the wakeup code to the waking vector.
77 */
78static int __acpi_pm_prepare(void)
79{
80 int error = acpi_sleep_prepare(acpi_target_sleep_state);
81
82 if (error)
83 acpi_target_sleep_state = ACPI_STATE_S0;
84 return error;
85}
86
87/**
88 * acpi_pm_prepare - Prepare the platform to enter the target sleep
89 * state and disable the GPEs.
90 */
91static int acpi_pm_prepare(void)
92{
93 int error = __acpi_pm_prepare();
94
95 if (!error)
96 acpi_hw_disable_all_gpes();
97 return error;
98}
99
100/**
101 * acpi_pm_finish - Instruct the platform to leave a sleep state.
102 *
103 * This is called after we wake back up (or if entering the sleep state
104 * failed).
105 */
106static void acpi_pm_finish(void)
107{
108 u32 acpi_state = acpi_target_sleep_state;
109
110 if (acpi_state == ACPI_STATE_S0)
111 return;
112
113 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
114 acpi_state);
115 acpi_disable_wakeup_device(acpi_state);
116 acpi_leave_sleep_state(acpi_state);
117
118 /* reset firmware waking vector */
119 acpi_set_firmware_waking_vector((acpi_physical_address) 0);
120
121 acpi_target_sleep_state = ACPI_STATE_S0;
122}
123
124/**
125 * acpi_pm_end - Finish up suspend sequence.
126 */
127static void acpi_pm_end(void)
128{
129 /*
130 * This is necessary in case acpi_pm_finish() is not called during a
131 * failing transition to a sleep state.
132 */
133 acpi_target_sleep_state = ACPI_STATE_S0;
134}
135#endif /* CONFIG_PM_SLEEP */
136
137#ifdef CONFIG_SUSPEND
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138extern void do_suspend_lowlevel(void);
139
140static u32 acpi_suspend_states[] = {
Alexey Starikovskiye2a5b422005-03-18 16:20:46 -0500141 [PM_SUSPEND_ON] = ACPI_STATE_S0,
142 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
143 [PM_SUSPEND_MEM] = ACPI_STATE_S3,
Alexey Starikovskiye2a5b422005-03-18 16:20:46 -0500144 [PM_SUSPEND_MAX] = ACPI_STATE_S5
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145};
146
Rafael J. Wysockie9b3aba2007-07-17 22:40:06 +0200147/**
Len Brown2c6e33c2008-04-23 18:02:52 -0400148 * acpi_suspend_begin - Set the target system sleep state to the state
Rafael J. Wysockie9b3aba2007-07-17 22:40:06 +0200149 * associated with given @pm_state, if supported.
150 */
Len Brown2c6e33c2008-04-23 18:02:52 -0400151static int acpi_suspend_begin(suspend_state_t pm_state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152{
153 u32 acpi_state = acpi_suspend_states[pm_state];
Rafael J. Wysockie9b3aba2007-07-17 22:40:06 +0200154 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
Rafael J. Wysockie9b3aba2007-07-17 22:40:06 +0200156 if (sleep_states[acpi_state]) {
157 acpi_target_sleep_state = acpi_state;
158 } else {
159 printk(KERN_ERR "ACPI does not support this state: %d\n",
160 pm_state);
161 error = -ENOSYS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 }
Rafael J. Wysockie9b3aba2007-07-17 22:40:06 +0200163 return error;
164}
165
166/**
Len Brown2c6e33c2008-04-23 18:02:52 -0400167 * acpi_suspend_enter - Actually enter a sleep state.
Rafael J. Wysockie9b3aba2007-07-17 22:40:06 +0200168 * @pm_state: ignored
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 *
Rafael J. Wysocki50ad1472007-07-24 11:58:39 +0200170 * Flush caches and go to sleep. For STR we have to call arch-specific
171 * assembly, which in turn call acpi_enter_sleep_state().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 * It's unfortunate, but it works. Please fix if you're feeling frisky.
173 */
Len Brown2c6e33c2008-04-23 18:02:52 -0400174static int acpi_suspend_enter(suspend_state_t pm_state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175{
176 acpi_status status = AE_OK;
177 unsigned long flags = 0;
Rafael J. Wysockie9b3aba2007-07-17 22:40:06 +0200178 u32 acpi_state = acpi_target_sleep_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
180 ACPI_FLUSH_CPU_CACHE();
181
182 /* Do arch specific saving of state. */
Rafael J. Wysocki50ad1472007-07-24 11:58:39 +0200183 if (acpi_state == ACPI_STATE_S3) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 int error = acpi_save_state_mem();
Rafael J. Wysockie9b3aba2007-07-17 22:40:06 +0200185
Rafael J. Wysocki60417f52008-01-08 00:07:39 +0100186 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 return error;
188 }
189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 local_irq_save(flags);
191 acpi_enable_wakeup_device(acpi_state);
Rafael J. Wysockie9b3aba2007-07-17 22:40:06 +0200192 switch (acpi_state) {
193 case ACPI_STATE_S1:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 barrier();
195 status = acpi_enter_sleep_state(acpi_state);
196 break;
197
Rafael J. Wysockie9b3aba2007-07-17 22:40:06 +0200198 case ACPI_STATE_S3:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 do_suspend_lowlevel();
200 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 }
Arnaud Patard872d83d2006-04-27 05:25:00 -0400202
Rafael J. Wysockic95d47a2008-01-08 00:05:21 +0100203 /* Reprogram control registers and execute _BFS */
204 acpi_leave_sleep_state_prep(acpi_state);
205
Pavel Machek23b168d2008-02-05 19:27:12 +0100206 /* ACPI 3.0 specs (P62) says that it's the responsibility
Arnaud Patard872d83d2006-04-27 05:25:00 -0400207 * of the OSPM to clear the status bit [ implying that the
208 * POWER_BUTTON event should not reach userspace ]
209 */
210 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
211 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
212
Shaohua Lia3627f62007-06-20 09:17:58 +0800213 /*
214 * Disable and clear GPE status before interrupt is enabled. Some GPEs
215 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
216 * acpi_leave_sleep_state will reenable specific GPEs later
217 */
218 acpi_hw_disable_all_gpes();
219
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 local_irq_restore(flags);
221 printk(KERN_DEBUG "Back to C!\n");
222
Rafael J. Wysockie9b3aba2007-07-17 22:40:06 +0200223 /* restore processor state */
Rafael J. Wysocki50ad1472007-07-24 11:58:39 +0200224 if (acpi_state == ACPI_STATE_S3)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 acpi_restore_state_mem();
226
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
228}
229
Len Brown2c6e33c2008-04-23 18:02:52 -0400230static int acpi_suspend_state_valid(suspend_state_t pm_state)
Shaohua Lieb9289e2005-10-30 15:00:01 -0800231{
Johannes Berge8c9c502007-04-30 15:09:54 -0700232 u32 acpi_state;
Shaohua Lieb9289e2005-10-30 15:00:01 -0800233
Johannes Berge8c9c502007-04-30 15:09:54 -0700234 switch (pm_state) {
235 case PM_SUSPEND_ON:
236 case PM_SUSPEND_STANDBY:
237 case PM_SUSPEND_MEM:
238 acpi_state = acpi_suspend_states[pm_state];
239
240 return sleep_states[acpi_state];
241 default:
242 return 0;
243 }
Shaohua Lieb9289e2005-10-30 15:00:01 -0800244}
245
Len Brown2c6e33c2008-04-23 18:02:52 -0400246static struct platform_suspend_ops acpi_suspend_ops = {
247 .valid = acpi_suspend_state_valid,
248 .begin = acpi_suspend_begin,
Rafael J. Wysockid8f3de02008-06-12 23:24:06 +0200249 .prepare = acpi_pm_prepare,
Len Brown2c6e33c2008-04-23 18:02:52 -0400250 .enter = acpi_suspend_enter,
Rafael J. Wysockid8f3de02008-06-12 23:24:06 +0200251 .finish = acpi_pm_finish,
252 .end = acpi_pm_end,
253};
254
255/**
256 * acpi_suspend_begin_old - Set the target system sleep state to the
257 * state associated with given @pm_state, if supported, and
258 * execute the _PTS control method. This function is used if the
259 * pre-ACPI 2.0 suspend ordering has been requested.
260 */
261static int acpi_suspend_begin_old(suspend_state_t pm_state)
262{
263 int error = acpi_suspend_begin(pm_state);
264
265 if (!error)
266 error = __acpi_pm_prepare();
267 return error;
268}
269
270/*
271 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
272 * been requested.
273 */
274static struct platform_suspend_ops acpi_suspend_ops_old = {
275 .valid = acpi_suspend_state_valid,
276 .begin = acpi_suspend_begin_old,
277 .prepare = acpi_pm_disable_gpes,
278 .enter = acpi_suspend_enter,
279 .finish = acpi_pm_finish,
280 .end = acpi_pm_end,
281 .recover = acpi_pm_finish,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282};
Carlos Corbachoe41fb7c2008-07-23 21:28:43 -0700283
284static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
285{
286 old_suspend_ordering = true;
287 return 0;
288}
289
290static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
291 {
292 .callback = init_old_suspend_ordering,
293 .ident = "Abit KN9 (nForce4 variant)",
294 .matches = {
295 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
296 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
297 },
298 },
299 {},
300};
Rafael J. Wysocki296699d2007-07-29 23:27:18 +0200301#endif /* CONFIG_SUSPEND */
302
Rafael J. Wysockib0cb1a12007-07-29 23:24:36 +0200303#ifdef CONFIG_HIBERNATION
Shaohua Libdfe6b72008-07-23 21:28:41 -0700304static unsigned long s4_hardware_signature;
305static struct acpi_table_facs *facs;
306static bool nosigcheck;
307
308void __init acpi_no_s4_hw_signature(void)
309{
310 nosigcheck = true;
311}
312
Rafael J. Wysockicaea99e2008-01-08 00:08:44 +0100313static int acpi_hibernation_begin(void)
Rafael J. Wysocki74f270a2007-10-18 03:04:42 -0700314{
315 acpi_target_sleep_state = ACPI_STATE_S4;
Rafael J. Wysocki7731ce62008-03-30 02:19:07 +0100316 return 0;
Rafael J. Wysocki74f270a2007-10-18 03:04:42 -0700317}
318
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700319static int acpi_hibernation_enter(void)
320{
321 acpi_status status = AE_OK;
322 unsigned long flags = 0;
323
324 ACPI_FLUSH_CPU_CACHE();
325
326 local_irq_save(flags);
327 acpi_enable_wakeup_device(ACPI_STATE_S4);
328 /* This shouldn't return. If it returns, we have a problem */
329 status = acpi_enter_sleep_state(ACPI_STATE_S4);
Rafael J. Wysockic95d47a2008-01-08 00:05:21 +0100330 /* Reprogram control registers and execute _BFS */
331 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700332 local_irq_restore(flags);
333
334 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
335}
336
Rafael J. Wysockic7e08312007-10-18 03:04:55 -0700337static void acpi_hibernation_leave(void)
338{
339 /*
340 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
341 * enable it here.
342 */
343 acpi_enable();
Rafael J. Wysockic95d47a2008-01-08 00:05:21 +0100344 /* Reprogram control registers and execute _BFS */
345 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
Shaohua Libdfe6b72008-07-23 21:28:41 -0700346 /* Check the hardware signature */
347 if (facs && s4_hardware_signature != facs->hardware_signature) {
348 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
349 "cannot resume!\n");
350 panic("ACPI S4 hardware signature mismatch");
351 }
Rafael J. Wysockic7e08312007-10-18 03:04:55 -0700352}
353
Rafael J. Wysockid8f3de02008-06-12 23:24:06 +0200354static void acpi_pm_enable_gpes(void)
Rafael J. Wysockia634cc12007-07-19 01:47:30 -0700355{
356 acpi_hw_enable_all_runtime_gpes();
357}
358
Rafael J. Wysockib3dac3b2007-10-18 03:04:43 -0700359static struct platform_hibernation_ops acpi_hibernation_ops = {
Rafael J. Wysockicaea99e2008-01-08 00:08:44 +0100360 .begin = acpi_hibernation_begin,
Rafael J. Wysockid8f3de02008-06-12 23:24:06 +0200361 .end = acpi_pm_end,
362 .pre_snapshot = acpi_pm_prepare,
363 .finish = acpi_pm_finish,
364 .prepare = acpi_pm_prepare,
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700365 .enter = acpi_hibernation_enter,
Rafael J. Wysockic7e08312007-10-18 03:04:55 -0700366 .leave = acpi_hibernation_leave,
Rafael J. Wysockid8f3de02008-06-12 23:24:06 +0200367 .pre_restore = acpi_pm_disable_gpes,
368 .restore_cleanup = acpi_pm_enable_gpes,
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700369};
Rafael J. Wysockid8f3de02008-06-12 23:24:06 +0200370
371/**
372 * acpi_hibernation_begin_old - Set the target system sleep state to
373 * ACPI_STATE_S4 and execute the _PTS control method. This
374 * function is used if the pre-ACPI 2.0 suspend ordering has been
375 * requested.
376 */
377static int acpi_hibernation_begin_old(void)
378{
379 int error = acpi_sleep_prepare(ACPI_STATE_S4);
380
381 if (!error)
382 acpi_target_sleep_state = ACPI_STATE_S4;
383 return error;
384}
385
386/*
387 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
388 * been requested.
389 */
390static struct platform_hibernation_ops acpi_hibernation_ops_old = {
391 .begin = acpi_hibernation_begin_old,
392 .end = acpi_pm_end,
393 .pre_snapshot = acpi_pm_disable_gpes,
394 .finish = acpi_pm_finish,
395 .prepare = acpi_pm_disable_gpes,
396 .enter = acpi_hibernation_enter,
397 .leave = acpi_hibernation_leave,
398 .pre_restore = acpi_pm_disable_gpes,
399 .restore_cleanup = acpi_pm_enable_gpes,
400 .recover = acpi_pm_finish,
401};
402#endif /* CONFIG_HIBERNATION */
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700403
Rafael J. Wysocki296699d2007-07-29 23:27:18 +0200404int acpi_suspend(u32 acpi_state)
405{
406 suspend_state_t states[] = {
407 [1] = PM_SUSPEND_STANDBY,
408 [3] = PM_SUSPEND_MEM,
409 [5] = PM_SUSPEND_MAX
410 };
411
412 if (acpi_state < 6 && states[acpi_state])
413 return pm_suspend(states[acpi_state]);
414 if (acpi_state == 4)
415 return hibernate();
416 return -EINVAL;
417}
418
Alexey Starikovskiy853298b2007-09-25 18:45:15 +0400419#ifdef CONFIG_PM_SLEEP
Shaohua Lifd4aff12007-07-17 22:40:25 +0200420/**
421 * acpi_pm_device_sleep_state - return preferred power state of ACPI device
422 * in the system sleep state given by %acpi_target_sleep_state
David Brownell2fe2de52008-06-05 01:15:40 +0200423 * @dev: device to examine; its driver model wakeup flags control
424 * whether it should be able to wake up the system
Shaohua Lifd4aff12007-07-17 22:40:25 +0200425 * @d_min_p: used to store the upper limit of allowed states range
426 * Return value: preferred power state of the device on success, -ENODEV on
427 * failure (ie. if there's no 'struct acpi_device' for @dev)
428 *
429 * Find the lowest power (highest number) ACPI device power state that
430 * device @dev can be in while the system is in the sleep state represented
431 * by %acpi_target_sleep_state. If @wake is nonzero, the device should be
432 * able to wake up the system from this sleep state. If @d_min_p is set,
433 * the highest power (lowest number) device power state of @dev allowed
434 * in this system sleep state is stored at the location pointed to by it.
435 *
436 * The caller must ensure that @dev is valid before using this function.
437 * The caller is also responsible for figuring out if the device is
438 * supposed to be able to wake up the system and passing this information
439 * via @wake.
440 */
441
David Brownell2fe2de52008-06-05 01:15:40 +0200442int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
Shaohua Lifd4aff12007-07-17 22:40:25 +0200443{
444 acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
445 struct acpi_device *adev;
446 char acpi_method[] = "_SxD";
447 unsigned long d_min, d_max;
448
449 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
Shaohua Liead77592007-08-23 15:01:13 +0800450 printk(KERN_DEBUG "ACPI handle has no context!\n");
Shaohua Lifd4aff12007-07-17 22:40:25 +0200451 return -ENODEV;
452 }
453
454 acpi_method[2] = '0' + acpi_target_sleep_state;
455 /*
456 * If the sleep state is S0, we will return D3, but if the device has
457 * _S0W, we will use the value from _S0W
458 */
459 d_min = ACPI_STATE_D0;
460 d_max = ACPI_STATE_D3;
461
462 /*
463 * If present, _SxD methods return the minimum D-state (highest power
464 * state) we can use for the corresponding S-states. Otherwise, the
465 * minimum D-state is D0 (ACPI 3.x).
466 *
467 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
468 * provided -- that's our fault recovery, we ignore retval.
469 */
470 if (acpi_target_sleep_state > ACPI_STATE_S0)
471 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
472
473 /*
474 * If _PRW says we can wake up the system from the target sleep state,
475 * the D-state returned by _SxD is sufficient for that (we assume a
476 * wakeup-aware driver if wake is set). Still, if _SxW exists
477 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
478 * can wake the system. _S0W may be valid, too.
479 */
480 if (acpi_target_sleep_state == ACPI_STATE_S0 ||
David Brownell2fe2de52008-06-05 01:15:40 +0200481 (device_may_wakeup(dev) && adev->wakeup.state.enabled &&
Shaohua Lifd4aff12007-07-17 22:40:25 +0200482 adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
Rafael J. Wysockiad3399c2008-01-11 00:10:38 +0100483 acpi_status status;
484
Shaohua Lifd4aff12007-07-17 22:40:25 +0200485 acpi_method[3] = 'W';
Rafael J. Wysockiad3399c2008-01-11 00:10:38 +0100486 status = acpi_evaluate_integer(handle, acpi_method, NULL,
487 &d_max);
488 if (ACPI_FAILURE(status)) {
489 d_max = d_min;
490 } else if (d_max < d_min) {
491 /* Warn the user of the broken DSDT */
492 printk(KERN_WARNING "ACPI: Wrong value from %s\n",
493 acpi_method);
494 /* Sanitize it */
Shaohua Lifd4aff12007-07-17 22:40:25 +0200495 d_min = d_max;
Rafael J. Wysockiad3399c2008-01-11 00:10:38 +0100496 }
Shaohua Lifd4aff12007-07-17 22:40:25 +0200497 }
498
499 if (d_min_p)
500 *d_min_p = d_min;
501 return d_max;
502}
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200503
504/**
505 * acpi_pm_device_sleep_wake - enable or disable the system wake-up
506 * capability of given device
507 * @dev: device to handle
508 * @enable: 'true' - enable, 'false' - disable the wake-up capability
509 */
510int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
511{
512 acpi_handle handle;
513 struct acpi_device *adev;
514
515 if (!device_may_wakeup(dev))
516 return -EINVAL;
517
518 handle = DEVICE_ACPI_HANDLE(dev);
519 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
520 printk(KERN_DEBUG "ACPI handle has no context!\n");
521 return -ENODEV;
522 }
523
524 return enable ?
525 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
526 acpi_disable_wakeup_device_power(adev);
527}
Alexey Starikovskiy853298b2007-09-25 18:45:15 +0400528#endif
Shaohua Lifd4aff12007-07-17 22:40:25 +0200529
Alexey Starikovskiyf216cc32007-09-20 21:32:35 +0400530static void acpi_power_off_prepare(void)
531{
532 /* Prepare to power off the system */
533 acpi_sleep_prepare(ACPI_STATE_S5);
Rafael J. Wysocki3c1d2b62008-01-08 00:06:16 +0100534 acpi_hw_disable_all_gpes();
Alexey Starikovskiyf216cc32007-09-20 21:32:35 +0400535}
536
537static void acpi_power_off(void)
538{
539 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
Harvey Harrison96b2dd12008-03-05 18:24:51 -0800540 printk("%s called\n", __func__);
Alexey Starikovskiyf216cc32007-09-20 21:32:35 +0400541 local_irq_disable();
Alexey Starikovskiy9c1c6a12007-10-22 14:18:06 +0400542 acpi_enable_wakeup_device(ACPI_STATE_S5);
Alexey Starikovskiyf216cc32007-09-20 21:32:35 +0400543 acpi_enter_sleep_state(ACPI_STATE_S5);
544}
545
Alexey Starikovskiyaafbcd12007-02-10 01:32:16 -0500546int __init acpi_sleep_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547{
Rafael J. Wysocki296699d2007-07-29 23:27:18 +0200548 acpi_status status;
549 u8 type_a, type_b;
550#ifdef CONFIG_SUSPEND
Alexey Starikovskiye2a5b422005-03-18 16:20:46 -0500551 int i = 0;
Carlos Corbachoe41fb7c2008-07-23 21:28:43 -0700552
553 dmi_check_system(acpisleep_dmi_table);
Rafael J. Wysocki296699d2007-07-29 23:27:18 +0200554#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555
556 if (acpi_disabled)
557 return 0;
558
Frans Pop5a50fe72007-09-20 22:27:44 +0200559 sleep_states[ACPI_STATE_S0] = 1;
560 printk(KERN_INFO PREFIX "(supports S0");
561
Rafael J. Wysocki296699d2007-07-29 23:27:18 +0200562#ifdef CONFIG_SUSPEND
Frans Pop5a50fe72007-09-20 22:27:44 +0200563 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
565 if (ACPI_SUCCESS(status)) {
566 sleep_states[i] = 1;
567 printk(" S%d", i);
568 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570
Rafael J. Wysockid8f3de02008-06-12 23:24:06 +0200571 suspend_set_ops(old_suspend_ordering ?
572 &acpi_suspend_ops_old : &acpi_suspend_ops);
Rafael J. Wysocki296699d2007-07-29 23:27:18 +0200573#endif
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700574
Rafael J. Wysockib0cb1a12007-07-29 23:24:36 +0200575#ifdef CONFIG_HIBERNATION
Rafael J. Wysocki296699d2007-07-29 23:27:18 +0200576 status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
577 if (ACPI_SUCCESS(status)) {
Rafael J. Wysockid8f3de02008-06-12 23:24:06 +0200578 hibernation_set_ops(old_suspend_ordering ?
579 &acpi_hibernation_ops_old : &acpi_hibernation_ops);
Rafael J. Wysocki296699d2007-07-29 23:27:18 +0200580 sleep_states[ACPI_STATE_S4] = 1;
Alexey Starikovskiyf216cc32007-09-20 21:32:35 +0400581 printk(" S4");
Shaohua Libdfe6b72008-07-23 21:28:41 -0700582 if (!nosigcheck) {
583 acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
584 (struct acpi_table_header **)&facs);
585 if (facs)
586 s4_hardware_signature =
587 facs->hardware_signature;
588 }
Rafael J. Wysocki296699d2007-07-29 23:27:18 +0200589 }
Rafael J. Wysockia3d25c22007-05-09 02:33:18 -0700590#endif
Alexey Starikovskiyf216cc32007-09-20 21:32:35 +0400591 status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
592 if (ACPI_SUCCESS(status)) {
593 sleep_states[ACPI_STATE_S5] = 1;
594 printk(" S5");
595 pm_power_off_prepare = acpi_power_off_prepare;
596 pm_power_off = acpi_power_off;
597 }
598 printk(")\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 return 0;
600}