Root/drivers/acpi/sleep.c

1/*
2 * sleep.c - ACPI sleep support.
3 *
4 * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
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>
18#include <linux/reboot.h>
19#include <linux/acpi.h>
20#include <linux/module.h>
21#include <linux/pm_runtime.h>
22
23#include <asm/io.h>
24
25#include <acpi/acpi_bus.h>
26#include <acpi/acpi_drivers.h>
27
28#include "internal.h"
29#include "sleep.h"
30
31static u8 sleep_states[ACPI_S_STATE_COUNT];
32
33static void acpi_sleep_tts_switch(u32 acpi_state)
34{
35    union acpi_object in_arg = { ACPI_TYPE_INTEGER };
36    struct acpi_object_list arg_list = { 1, &in_arg };
37    acpi_status status = AE_OK;
38
39    in_arg.integer.value = acpi_state;
40    status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
41    if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
42        /*
43         * OS can't evaluate the _TTS object correctly. Some warning
44         * message will be printed. But it won't break anything.
45         */
46        printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
47    }
48}
49
50static int tts_notify_reboot(struct notifier_block *this,
51            unsigned long code, void *x)
52{
53    acpi_sleep_tts_switch(ACPI_STATE_S5);
54    return NOTIFY_DONE;
55}
56
57static struct notifier_block tts_notifier = {
58    .notifier_call = tts_notify_reboot,
59    .next = NULL,
60    .priority = 0,
61};
62
63static int acpi_sleep_prepare(u32 acpi_state)
64{
65#ifdef CONFIG_ACPI_SLEEP
66    /* do we have a wakeup address for S2 and S3? */
67    if (acpi_state == ACPI_STATE_S3) {
68        if (!acpi_wakeup_address)
69            return -EFAULT;
70        acpi_set_firmware_waking_vector(acpi_wakeup_address);
71
72    }
73    ACPI_FLUSH_CPU_CACHE();
74#endif
75    printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
76        acpi_state);
77    acpi_enable_wakeup_devices(acpi_state);
78    acpi_enter_sleep_state_prep(acpi_state);
79    return 0;
80}
81
82#ifdef CONFIG_ACPI_SLEEP
83static u32 acpi_target_sleep_state = ACPI_STATE_S0;
84static bool pwr_btn_event_pending;
85
86/*
87 * The ACPI specification wants us to save NVS memory regions during hibernation
88 * and to restore them during the subsequent resume. Windows does that also for
89 * suspend to RAM. However, it is known that this mechanism does not work on
90 * all machines, so we allow the user to disable it with the help of the
91 * 'acpi_sleep=nonvs' kernel command line option.
92 */
93static bool nvs_nosave;
94
95void __init acpi_nvs_nosave(void)
96{
97    nvs_nosave = true;
98}
99
100/*
101 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
102 * user to request that behavior by using the 'acpi_old_suspend_ordering'
103 * kernel command line option that causes the following variable to be set.
104 */
105static bool old_suspend_ordering;
106
107void __init acpi_old_suspend_ordering(void)
108{
109    old_suspend_ordering = true;
110}
111
112/**
113 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
114 */
115static int acpi_pm_freeze(void)
116{
117    acpi_disable_all_gpes();
118    acpi_os_wait_events_complete();
119    acpi_ec_block_transactions();
120    return 0;
121}
122
123/**
124 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
125 */
126static int acpi_pm_pre_suspend(void)
127{
128    acpi_pm_freeze();
129    return suspend_nvs_save();
130}
131
132/**
133 * __acpi_pm_prepare - Prepare the platform to enter the target state.
134 *
135 * If necessary, set the firmware waking vector and do arch-specific
136 * nastiness to get the wakeup code to the waking vector.
137 */
138static int __acpi_pm_prepare(void)
139{
140    int error = acpi_sleep_prepare(acpi_target_sleep_state);
141    if (error)
142        acpi_target_sleep_state = ACPI_STATE_S0;
143
144    return error;
145}
146
147/**
148 * acpi_pm_prepare - Prepare the platform to enter the target sleep
149 * state and disable the GPEs.
150 */
151static int acpi_pm_prepare(void)
152{
153    int error = __acpi_pm_prepare();
154    if (!error)
155        error = acpi_pm_pre_suspend();
156
157    return error;
158}
159
160static int find_powerf_dev(struct device *dev, void *data)
161{
162    struct acpi_device *device = to_acpi_device(dev);
163    const char *hid = acpi_device_hid(device);
164
165    return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
166}
167
168/**
169 * acpi_pm_finish - Instruct the platform to leave a sleep state.
170 *
171 * This is called after we wake back up (or if entering the sleep state
172 * failed).
173 */
174static void acpi_pm_finish(void)
175{
176    struct device *pwr_btn_dev;
177    u32 acpi_state = acpi_target_sleep_state;
178
179    acpi_ec_unblock_transactions();
180    suspend_nvs_free();
181
182    if (acpi_state == ACPI_STATE_S0)
183        return;
184
185    printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
186        acpi_state);
187    acpi_disable_wakeup_devices(acpi_state);
188    acpi_leave_sleep_state(acpi_state);
189
190    /* reset firmware waking vector */
191    acpi_set_firmware_waking_vector((acpi_physical_address) 0);
192
193    acpi_target_sleep_state = ACPI_STATE_S0;
194
195    /* If we were woken with the fixed power button, provide a small
196     * hint to userspace in the form of a wakeup event on the fixed power
197     * button device (if it can be found).
198     *
199     * We delay the event generation til now, as the PM layer requires
200     * timekeeping to be running before we generate events. */
201    if (!pwr_btn_event_pending)
202        return;
203
204    pwr_btn_event_pending = false;
205    pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
206                      find_powerf_dev);
207    if (pwr_btn_dev) {
208        pm_wakeup_event(pwr_btn_dev, 0);
209        put_device(pwr_btn_dev);
210    }
211}
212
213/**
214 * acpi_pm_end - Finish up suspend sequence.
215 */
216static void acpi_pm_end(void)
217{
218    /*
219     * This is necessary in case acpi_pm_finish() is not called during a
220     * failing transition to a sleep state.
221     */
222    acpi_target_sleep_state = ACPI_STATE_S0;
223    acpi_sleep_tts_switch(acpi_target_sleep_state);
224}
225#else /* !CONFIG_ACPI_SLEEP */
226#define acpi_target_sleep_state ACPI_STATE_S0
227#endif /* CONFIG_ACPI_SLEEP */
228
229#ifdef CONFIG_SUSPEND
230static u32 acpi_suspend_states[] = {
231    [PM_SUSPEND_ON] = ACPI_STATE_S0,
232    [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
233    [PM_SUSPEND_MEM] = ACPI_STATE_S3,
234    [PM_SUSPEND_MAX] = ACPI_STATE_S5
235};
236
237/**
238 * acpi_suspend_begin - Set the target system sleep state to the state
239 * associated with given @pm_state, if supported.
240 */
241static int acpi_suspend_begin(suspend_state_t pm_state)
242{
243    u32 acpi_state = acpi_suspend_states[pm_state];
244    int error = 0;
245
246    error = nvs_nosave ? 0 : suspend_nvs_alloc();
247    if (error)
248        return error;
249
250    if (sleep_states[acpi_state]) {
251        acpi_target_sleep_state = acpi_state;
252        acpi_sleep_tts_switch(acpi_target_sleep_state);
253    } else {
254        printk(KERN_ERR "ACPI does not support this state: %d\n",
255            pm_state);
256        error = -ENOSYS;
257    }
258    return error;
259}
260
261/**
262 * acpi_suspend_enter - Actually enter a sleep state.
263 * @pm_state: ignored
264 *
265 * Flush caches and go to sleep. For STR we have to call arch-specific
266 * assembly, which in turn call acpi_enter_sleep_state().
267 * It's unfortunate, but it works. Please fix if you're feeling frisky.
268 */
269static int acpi_suspend_enter(suspend_state_t pm_state)
270{
271    acpi_status status = AE_OK;
272    u32 acpi_state = acpi_target_sleep_state;
273    int error;
274
275    ACPI_FLUSH_CPU_CACHE();
276
277    switch (acpi_state) {
278    case ACPI_STATE_S1:
279        barrier();
280        status = acpi_enter_sleep_state(acpi_state);
281        break;
282
283    case ACPI_STATE_S3:
284        error = acpi_suspend_lowlevel();
285        if (error)
286            return error;
287        pr_info(PREFIX "Low-level resume complete\n");
288        break;
289    }
290
291    /* This violates the spec but is required for bug compatibility. */
292    acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
293
294    /* Reprogram control registers */
295    acpi_leave_sleep_state_prep(acpi_state);
296
297    /* ACPI 3.0 specs (P62) says that it's the responsibility
298     * of the OSPM to clear the status bit [ implying that the
299     * POWER_BUTTON event should not reach userspace ]
300     *
301     * However, we do generate a small hint for userspace in the form of
302     * a wakeup event. We flag this condition for now and generate the
303     * event later, as we're currently too early in resume to be able to
304     * generate wakeup events.
305     */
306    if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
307        acpi_event_status pwr_btn_status;
308
309        acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
310
311        if (pwr_btn_status & ACPI_EVENT_FLAG_SET) {
312            acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
313            /* Flag for later */
314            pwr_btn_event_pending = true;
315        }
316    }
317
318    /*
319     * Disable and clear GPE status before interrupt is enabled. Some GPEs
320     * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
321     * acpi_leave_sleep_state will reenable specific GPEs later
322     */
323    acpi_disable_all_gpes();
324    /* Allow EC transactions to happen. */
325    acpi_ec_unblock_transactions_early();
326
327    suspend_nvs_restore();
328
329    return ACPI_SUCCESS(status) ? 0 : -EFAULT;
330}
331
332static int acpi_suspend_state_valid(suspend_state_t pm_state)
333{
334    u32 acpi_state;
335
336    switch (pm_state) {
337    case PM_SUSPEND_ON:
338    case PM_SUSPEND_STANDBY:
339    case PM_SUSPEND_MEM:
340        acpi_state = acpi_suspend_states[pm_state];
341
342        return sleep_states[acpi_state];
343    default:
344        return 0;
345    }
346}
347
348static const struct platform_suspend_ops acpi_suspend_ops = {
349    .valid = acpi_suspend_state_valid,
350    .begin = acpi_suspend_begin,
351    .prepare_late = acpi_pm_prepare,
352    .enter = acpi_suspend_enter,
353    .wake = acpi_pm_finish,
354    .end = acpi_pm_end,
355};
356
357/**
358 * acpi_suspend_begin_old - Set the target system sleep state to the
359 * state associated with given @pm_state, if supported, and
360 * execute the _PTS control method. This function is used if the
361 * pre-ACPI 2.0 suspend ordering has been requested.
362 */
363static int acpi_suspend_begin_old(suspend_state_t pm_state)
364{
365    int error = acpi_suspend_begin(pm_state);
366    if (!error)
367        error = __acpi_pm_prepare();
368
369    return error;
370}
371
372/*
373 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
374 * been requested.
375 */
376static const struct platform_suspend_ops acpi_suspend_ops_old = {
377    .valid = acpi_suspend_state_valid,
378    .begin = acpi_suspend_begin_old,
379    .prepare_late = acpi_pm_pre_suspend,
380    .enter = acpi_suspend_enter,
381    .wake = acpi_pm_finish,
382    .end = acpi_pm_end,
383    .recover = acpi_pm_finish,
384};
385
386static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
387{
388    old_suspend_ordering = true;
389    return 0;
390}
391
392static int __init init_nvs_nosave(const struct dmi_system_id *d)
393{
394    acpi_nvs_nosave();
395    return 0;
396}
397
398static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
399    {
400    .callback = init_old_suspend_ordering,
401    .ident = "Abit KN9 (nForce4 variant)",
402    .matches = {
403        DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
404        DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
405        },
406    },
407    {
408    .callback = init_old_suspend_ordering,
409    .ident = "HP xw4600 Workstation",
410    .matches = {
411        DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
412        DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
413        },
414    },
415    {
416    .callback = init_old_suspend_ordering,
417    .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
418    .matches = {
419        DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
420        DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
421        },
422    },
423    {
424    .callback = init_old_suspend_ordering,
425    .ident = "Panasonic CF51-2L",
426    .matches = {
427        DMI_MATCH(DMI_BOARD_VENDOR,
428                "Matsushita Electric Industrial Co.,Ltd."),
429        DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
430        },
431    },
432    {
433    .callback = init_nvs_nosave,
434    .ident = "Sony Vaio VGN-FW21E",
435    .matches = {
436        DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
437        DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
438        },
439    },
440    {
441    .callback = init_nvs_nosave,
442    .ident = "Sony Vaio VPCEB17FX",
443    .matches = {
444        DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
445        DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
446        },
447    },
448    {
449    .callback = init_nvs_nosave,
450    .ident = "Sony Vaio VGN-SR11M",
451    .matches = {
452        DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
453        DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
454        },
455    },
456    {
457    .callback = init_nvs_nosave,
458    .ident = "Everex StepNote Series",
459    .matches = {
460        DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
461        DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
462        },
463    },
464    {
465    .callback = init_nvs_nosave,
466    .ident = "Sony Vaio VPCEB1Z1E",
467    .matches = {
468        DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
469        DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
470        },
471    },
472    {
473    .callback = init_nvs_nosave,
474    .ident = "Sony Vaio VGN-NW130D",
475    .matches = {
476        DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
477        DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
478        },
479    },
480    {
481    .callback = init_nvs_nosave,
482    .ident = "Sony Vaio VPCCW29FX",
483    .matches = {
484        DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
485        DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
486        },
487    },
488    {
489    .callback = init_nvs_nosave,
490    .ident = "Averatec AV1020-ED2",
491    .matches = {
492        DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
493        DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
494        },
495    },
496    {
497    .callback = init_old_suspend_ordering,
498    .ident = "Asus A8N-SLI DELUXE",
499    .matches = {
500        DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
501        DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
502        },
503    },
504    {
505    .callback = init_old_suspend_ordering,
506    .ident = "Asus A8N-SLI Premium",
507    .matches = {
508        DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
509        DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
510        },
511    },
512    {
513    .callback = init_nvs_nosave,
514    .ident = "Sony Vaio VGN-SR26GN_P",
515    .matches = {
516        DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
517        DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
518        },
519    },
520    {
521    .callback = init_nvs_nosave,
522    .ident = "Sony Vaio VGN-FW520F",
523    .matches = {
524        DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
525        DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
526        },
527    },
528    {
529    .callback = init_nvs_nosave,
530    .ident = "Asus K54C",
531    .matches = {
532        DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
533        DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
534        },
535    },
536    {
537    .callback = init_nvs_nosave,
538    .ident = "Asus K54HR",
539    .matches = {
540        DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
541        DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
542        },
543    },
544    {},
545};
546#endif /* CONFIG_SUSPEND */
547
548#ifdef CONFIG_HIBERNATION
549static unsigned long s4_hardware_signature;
550static struct acpi_table_facs *facs;
551static bool nosigcheck;
552
553void __init acpi_no_s4_hw_signature(void)
554{
555    nosigcheck = true;
556}
557
558static int acpi_hibernation_begin(void)
559{
560    int error;
561
562    error = nvs_nosave ? 0 : suspend_nvs_alloc();
563    if (!error) {
564        acpi_target_sleep_state = ACPI_STATE_S4;
565        acpi_sleep_tts_switch(acpi_target_sleep_state);
566    }
567
568    return error;
569}
570
571static int acpi_hibernation_enter(void)
572{
573    acpi_status status = AE_OK;
574
575    ACPI_FLUSH_CPU_CACHE();
576
577    /* This shouldn't return. If it returns, we have a problem */
578    status = acpi_enter_sleep_state(ACPI_STATE_S4);
579    /* Reprogram control registers */
580    acpi_leave_sleep_state_prep(ACPI_STATE_S4);
581
582    return ACPI_SUCCESS(status) ? 0 : -EFAULT;
583}
584
585static void acpi_hibernation_leave(void)
586{
587    /*
588     * If ACPI is not enabled by the BIOS and the boot kernel, we need to
589     * enable it here.
590     */
591    acpi_enable();
592    /* Reprogram control registers */
593    acpi_leave_sleep_state_prep(ACPI_STATE_S4);
594    /* Check the hardware signature */
595    if (facs && s4_hardware_signature != facs->hardware_signature) {
596        printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
597            "cannot resume!\n");
598        panic("ACPI S4 hardware signature mismatch");
599    }
600    /* Restore the NVS memory area */
601    suspend_nvs_restore();
602    /* Allow EC transactions to happen. */
603    acpi_ec_unblock_transactions_early();
604}
605
606static void acpi_pm_thaw(void)
607{
608    acpi_ec_unblock_transactions();
609    acpi_enable_all_runtime_gpes();
610}
611
612static const struct platform_hibernation_ops acpi_hibernation_ops = {
613    .begin = acpi_hibernation_begin,
614    .end = acpi_pm_end,
615    .pre_snapshot = acpi_pm_prepare,
616    .finish = acpi_pm_finish,
617    .prepare = acpi_pm_prepare,
618    .enter = acpi_hibernation_enter,
619    .leave = acpi_hibernation_leave,
620    .pre_restore = acpi_pm_freeze,
621    .restore_cleanup = acpi_pm_thaw,
622};
623
624/**
625 * acpi_hibernation_begin_old - Set the target system sleep state to
626 * ACPI_STATE_S4 and execute the _PTS control method. This
627 * function is used if the pre-ACPI 2.0 suspend ordering has been
628 * requested.
629 */
630static int acpi_hibernation_begin_old(void)
631{
632    int error;
633    /*
634     * The _TTS object should always be evaluated before the _PTS object.
635     * When the old_suspended_ordering is true, the _PTS object is
636     * evaluated in the acpi_sleep_prepare.
637     */
638    acpi_sleep_tts_switch(ACPI_STATE_S4);
639
640    error = acpi_sleep_prepare(ACPI_STATE_S4);
641
642    if (!error) {
643        if (!nvs_nosave)
644            error = suspend_nvs_alloc();
645        if (!error)
646            acpi_target_sleep_state = ACPI_STATE_S4;
647    }
648    return error;
649}
650
651/*
652 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
653 * been requested.
654 */
655static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
656    .begin = acpi_hibernation_begin_old,
657    .end = acpi_pm_end,
658    .pre_snapshot = acpi_pm_pre_suspend,
659    .prepare = acpi_pm_freeze,
660    .finish = acpi_pm_finish,
661    .enter = acpi_hibernation_enter,
662    .leave = acpi_hibernation_leave,
663    .pre_restore = acpi_pm_freeze,
664    .restore_cleanup = acpi_pm_thaw,
665    .recover = acpi_pm_finish,
666};
667#endif /* CONFIG_HIBERNATION */
668
669int acpi_suspend(u32 acpi_state)
670{
671    suspend_state_t states[] = {
672        [1] = PM_SUSPEND_STANDBY,
673        [3] = PM_SUSPEND_MEM,
674        [5] = PM_SUSPEND_MAX
675    };
676
677    if (acpi_state < 6 && states[acpi_state])
678        return pm_suspend(states[acpi_state]);
679    if (acpi_state == 4)
680        return hibernate();
681    return -EINVAL;
682}
683
684#ifdef CONFIG_PM
685/**
686 * acpi_pm_device_sleep_state - return preferred power state of ACPI device
687 * in the system sleep state given by %acpi_target_sleep_state
688 * @dev: device to examine; its driver model wakeup flags control
689 * whether it should be able to wake up the system
690 * @d_min_p: used to store the upper limit of allowed states range
691 * @d_max_in: specify the lowest allowed states
692 * Return value: preferred power state of the device on success, -ENODEV
693 * (ie. if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
694 *
695 * Find the lowest power (highest number) ACPI device power state that
696 * device @dev can be in while the system is in the sleep state represented
697 * by %acpi_target_sleep_state. If @wake is nonzero, the device should be
698 * able to wake up the system from this sleep state. If @d_min_p is set,
699 * the highest power (lowest number) device power state of @dev allowed
700 * in this system sleep state is stored at the location pointed to by it.
701 *
702 * The caller must ensure that @dev is valid before using this function.
703 * The caller is also responsible for figuring out if the device is
704 * supposed to be able to wake up the system and passing this information
705 * via @wake.
706 */
707
708int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
709{
710    acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
711    struct acpi_device *adev;
712    char acpi_method[] = "_SxD";
713    unsigned long long d_min, d_max;
714
715    if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3)
716        return -EINVAL;
717    if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
718        printk(KERN_DEBUG "ACPI handle has no context!\n");
719        return -ENODEV;
720    }
721
722    acpi_method[2] = '0' + acpi_target_sleep_state;
723    /*
724     * If the sleep state is S0, the lowest limit from ACPI is D3,
725     * but if the device has _S0W, we will use the value from _S0W
726     * as the lowest limit from ACPI. Finally, we will constrain
727     * the lowest limit with the specified one.
728     */
729    d_min = ACPI_STATE_D0;
730    d_max = ACPI_STATE_D3;
731
732    /*
733     * If present, _SxD methods return the minimum D-state (highest power
734     * state) we can use for the corresponding S-states. Otherwise, the
735     * minimum D-state is D0 (ACPI 3.x).
736     *
737     * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
738     * provided -- that's our fault recovery, we ignore retval.
739     */
740    if (acpi_target_sleep_state > ACPI_STATE_S0)
741        acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
742
743    /*
744     * If _PRW says we can wake up the system from the target sleep state,
745     * the D-state returned by _SxD is sufficient for that (we assume a
746     * wakeup-aware driver if wake is set). Still, if _SxW exists
747     * (ACPI 3.x), it should return the maximum (lowest power) D-state that
748     * can wake the system. _S0W may be valid, too.
749     */
750    if (acpi_target_sleep_state == ACPI_STATE_S0 ||
751        (device_may_wakeup(dev) && adev->wakeup.flags.valid &&
752         adev->wakeup.sleep_state >= acpi_target_sleep_state)) {
753        acpi_status status;
754
755        acpi_method[3] = 'W';
756        status = acpi_evaluate_integer(handle, acpi_method, NULL,
757                        &d_max);
758        if (ACPI_FAILURE(status)) {
759            if (acpi_target_sleep_state != ACPI_STATE_S0 ||
760                status != AE_NOT_FOUND)
761                d_max = d_min;
762        } else if (d_max < d_min) {
763            /* Warn the user of the broken DSDT */
764            printk(KERN_WARNING "ACPI: Wrong value from %s\n",
765                acpi_method);
766            /* Sanitize it */
767            d_min = d_max;
768        }
769    }
770
771    if (d_max_in < d_min)
772        return -EINVAL;
773    if (d_min_p)
774        *d_min_p = d_min;
775    /* constrain d_max with specified lowest limit (max number) */
776    if (d_max > d_max_in) {
777        for (d_max = d_max_in; d_max > d_min; d_max--) {
778            if (adev->power.states[d_max].flags.valid)
779                break;
780        }
781    }
782    return d_max;
783}
784EXPORT_SYMBOL(acpi_pm_device_sleep_state);
785#endif /* CONFIG_PM */
786
787#ifdef CONFIG_PM_SLEEP
788/**
789 * acpi_pm_device_run_wake - Enable/disable wake-up for given device.
790 * @phys_dev: Device to enable/disable the platform to wake-up the system for.
791 * @enable: Whether enable or disable the wake-up functionality.
792 *
793 * Find the ACPI device object corresponding to @pci_dev and try to
794 * enable/disable the GPE associated with it.
795 */
796int acpi_pm_device_run_wake(struct device *phys_dev, bool enable)
797{
798    struct acpi_device *dev;
799    acpi_handle handle;
800
801    if (!device_run_wake(phys_dev))
802        return -EINVAL;
803
804    handle = DEVICE_ACPI_HANDLE(phys_dev);
805    if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &dev))) {
806        dev_dbg(phys_dev, "ACPI handle has no context in %s!\n",
807            __func__);
808        return -ENODEV;
809    }
810
811    if (enable) {
812        acpi_enable_wakeup_device_power(dev, ACPI_STATE_S0);
813        acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
814    } else {
815        acpi_disable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
816        acpi_disable_wakeup_device_power(dev);
817    }
818
819    return 0;
820}
821EXPORT_SYMBOL(acpi_pm_device_run_wake);
822
823/**
824 * acpi_pm_device_sleep_wake - enable or disable the system wake-up
825 * capability of given device
826 * @dev: device to handle
827 * @enable: 'true' - enable, 'false' - disable the wake-up capability
828 */
829int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
830{
831    acpi_handle handle;
832    struct acpi_device *adev;
833    int error;
834
835    if (!device_can_wakeup(dev))
836        return -EINVAL;
837
838    handle = DEVICE_ACPI_HANDLE(dev);
839    if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
840        dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
841        return -ENODEV;
842    }
843
844    error = enable ?
845        acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
846        acpi_disable_wakeup_device_power(adev);
847    if (!error)
848        dev_info(dev, "wake-up capability %s by ACPI\n",
849                enable ? "enabled" : "disabled");
850
851    return error;
852}
853#endif /* CONFIG_PM_SLEEP */
854
855static void acpi_power_off_prepare(void)
856{
857    /* Prepare to power off the system */
858    acpi_sleep_prepare(ACPI_STATE_S5);
859    acpi_disable_all_gpes();
860}
861
862static void acpi_power_off(void)
863{
864    /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
865    printk(KERN_DEBUG "%s called\n", __func__);
866    local_irq_disable();
867    acpi_enter_sleep_state(ACPI_STATE_S5);
868}
869
870int __init acpi_sleep_init(void)
871{
872    acpi_status status;
873    u8 type_a, type_b;
874#ifdef CONFIG_SUSPEND
875    int i = 0;
876
877    dmi_check_system(acpisleep_dmi_table);
878#endif
879
880    if (acpi_disabled)
881        return 0;
882
883    sleep_states[ACPI_STATE_S0] = 1;
884    printk(KERN_INFO PREFIX "(supports S0");
885
886#ifdef CONFIG_SUSPEND
887    for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
888        status = acpi_get_sleep_type_data(i, &type_a, &type_b);
889        if (ACPI_SUCCESS(status)) {
890            sleep_states[i] = 1;
891            printk(KERN_CONT " S%d", i);
892        }
893    }
894
895    suspend_set_ops(old_suspend_ordering ?
896        &acpi_suspend_ops_old : &acpi_suspend_ops);
897#endif
898
899#ifdef CONFIG_HIBERNATION
900    status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
901    if (ACPI_SUCCESS(status)) {
902        hibernation_set_ops(old_suspend_ordering ?
903            &acpi_hibernation_ops_old : &acpi_hibernation_ops);
904        sleep_states[ACPI_STATE_S4] = 1;
905        printk(KERN_CONT " S4");
906        if (!nosigcheck) {
907            acpi_get_table(ACPI_SIG_FACS, 1,
908                (struct acpi_table_header **)&facs);
909            if (facs)
910                s4_hardware_signature =
911                    facs->hardware_signature;
912        }
913    }
914#endif
915    status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
916    if (ACPI_SUCCESS(status)) {
917        sleep_states[ACPI_STATE_S5] = 1;
918        printk(KERN_CONT " S5");
919        pm_power_off_prepare = acpi_power_off_prepare;
920        pm_power_off = acpi_power_off;
921    }
922    printk(KERN_CONT ")\n");
923    /*
924     * Register the tts_notifier to reboot notifier list so that the _TTS
925     * object can also be evaluated when the system enters S5.
926     */
927    register_reboot_notifier(&tts_notifier);
928    return 0;
929}
930

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