![Rafael J. Wysocki](/assets/img/avatar_default.png)
The names of the functions used for blocking/unblocking EC transactions during suspend/hibernation suggest that the transactions are suspended and resumed by them, while in fact they are disabled and enabled. Rename the functions (and the flag used by them) to better reflect what they really do. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Len Brown <len.brown@intel.com>
939 lines
24 KiB
C
939 lines
24 KiB
C
/*
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* sleep.c - ACPI sleep support.
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*
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* Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
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* Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
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* Copyright (c) 2000-2003 Patrick Mochel
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* Copyright (c) 2003 Open Source Development Lab
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*
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* This file is released under the GPLv2.
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*
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*/
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#include <linux/delay.h>
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#include <linux/irq.h>
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#include <linux/dmi.h>
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#include <linux/device.h>
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#include <linux/suspend.h>
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#include <linux/reboot.h>
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#include <asm/io.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#include "internal.h"
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#include "sleep.h"
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u8 sleep_states[ACPI_S_STATE_COUNT];
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static void acpi_sleep_tts_switch(u32 acpi_state)
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{
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union acpi_object in_arg = { ACPI_TYPE_INTEGER };
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struct acpi_object_list arg_list = { 1, &in_arg };
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acpi_status status = AE_OK;
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in_arg.integer.value = acpi_state;
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status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
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if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
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/*
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* OS can't evaluate the _TTS object correctly. Some warning
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* message will be printed. But it won't break anything.
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*/
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printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
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}
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}
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static int tts_notify_reboot(struct notifier_block *this,
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unsigned long code, void *x)
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{
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acpi_sleep_tts_switch(ACPI_STATE_S5);
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return NOTIFY_DONE;
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}
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static struct notifier_block tts_notifier = {
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.notifier_call = tts_notify_reboot,
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.next = NULL,
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.priority = 0,
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};
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static int acpi_sleep_prepare(u32 acpi_state)
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{
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#ifdef CONFIG_ACPI_SLEEP
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/* do we have a wakeup address for S2 and S3? */
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if (acpi_state == ACPI_STATE_S3) {
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if (!acpi_wakeup_address) {
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return -EFAULT;
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}
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acpi_set_firmware_waking_vector(
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(acpi_physical_address)acpi_wakeup_address);
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}
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ACPI_FLUSH_CPU_CACHE();
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acpi_enable_wakeup_device_prep(acpi_state);
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#endif
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printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
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acpi_state);
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acpi_enter_sleep_state_prep(acpi_state);
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return 0;
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}
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#ifdef CONFIG_ACPI_SLEEP
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static u32 acpi_target_sleep_state = ACPI_STATE_S0;
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/*
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* According to the ACPI specification the BIOS should make sure that ACPI is
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* enabled and SCI_EN bit is set on wake-up from S1 - S3 sleep states. Still,
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* some BIOSes don't do that and therefore we use acpi_enable() to enable ACPI
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* on such systems during resume. Unfortunately that doesn't help in
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* particularly pathological cases in which SCI_EN has to be set directly on
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* resume, although the specification states very clearly that this flag is
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* owned by the hardware. The set_sci_en_on_resume variable will be set in such
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* cases.
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*/
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static bool set_sci_en_on_resume;
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void __init acpi_set_sci_en_on_resume(void)
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{
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set_sci_en_on_resume = true;
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}
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/*
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* ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
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* user to request that behavior by using the 'acpi_old_suspend_ordering'
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* kernel command line option that causes the following variable to be set.
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*/
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static bool old_suspend_ordering;
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void __init acpi_old_suspend_ordering(void)
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{
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old_suspend_ordering = true;
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}
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/**
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* acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
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*/
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static int acpi_pm_freeze(void)
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{
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acpi_disable_all_gpes();
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acpi_os_wait_events_complete(NULL);
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acpi_ec_block_transactions();
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return 0;
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}
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/**
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* __acpi_pm_prepare - Prepare the platform to enter the target state.
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*
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* If necessary, set the firmware waking vector and do arch-specific
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* nastiness to get the wakeup code to the waking vector.
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*/
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static int __acpi_pm_prepare(void)
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{
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int error = acpi_sleep_prepare(acpi_target_sleep_state);
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if (error)
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acpi_target_sleep_state = ACPI_STATE_S0;
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return error;
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}
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/**
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* acpi_pm_prepare - Prepare the platform to enter the target sleep
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* state and disable the GPEs.
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*/
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static int acpi_pm_prepare(void)
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{
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int error = __acpi_pm_prepare();
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if (!error)
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acpi_pm_freeze();
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return error;
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}
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/**
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* acpi_pm_finish - Instruct the platform to leave a sleep state.
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*
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* This is called after we wake back up (or if entering the sleep state
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* failed).
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*/
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static void acpi_pm_finish(void)
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{
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u32 acpi_state = acpi_target_sleep_state;
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if (acpi_state == ACPI_STATE_S0)
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return;
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printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
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acpi_state);
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acpi_disable_wakeup_device(acpi_state);
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acpi_leave_sleep_state(acpi_state);
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/* reset firmware waking vector */
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acpi_set_firmware_waking_vector((acpi_physical_address) 0);
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acpi_target_sleep_state = ACPI_STATE_S0;
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}
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/**
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* acpi_pm_end - Finish up suspend sequence.
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*/
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static void acpi_pm_end(void)
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{
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/*
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* This is necessary in case acpi_pm_finish() is not called during a
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* failing transition to a sleep state.
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*/
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acpi_target_sleep_state = ACPI_STATE_S0;
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acpi_sleep_tts_switch(acpi_target_sleep_state);
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}
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#else /* !CONFIG_ACPI_SLEEP */
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#define acpi_target_sleep_state ACPI_STATE_S0
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#endif /* CONFIG_ACPI_SLEEP */
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#ifdef CONFIG_SUSPEND
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extern void do_suspend_lowlevel(void);
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static u32 acpi_suspend_states[] = {
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[PM_SUSPEND_ON] = ACPI_STATE_S0,
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[PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
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[PM_SUSPEND_MEM] = ACPI_STATE_S3,
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[PM_SUSPEND_MAX] = ACPI_STATE_S5
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};
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/**
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* acpi_suspend_begin - Set the target system sleep state to the state
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* associated with given @pm_state, if supported.
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*/
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static int acpi_suspend_begin(suspend_state_t pm_state)
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{
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u32 acpi_state = acpi_suspend_states[pm_state];
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int error = 0;
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if (sleep_states[acpi_state]) {
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acpi_target_sleep_state = acpi_state;
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acpi_sleep_tts_switch(acpi_target_sleep_state);
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} else {
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printk(KERN_ERR "ACPI does not support this state: %d\n",
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pm_state);
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error = -ENOSYS;
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}
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return error;
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}
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/**
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* acpi_suspend_enter - Actually enter a sleep state.
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* @pm_state: ignored
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*
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* Flush caches and go to sleep. For STR we have to call arch-specific
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* assembly, which in turn call acpi_enter_sleep_state().
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* It's unfortunate, but it works. Please fix if you're feeling frisky.
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*/
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static int acpi_suspend_enter(suspend_state_t pm_state)
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{
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acpi_status status = AE_OK;
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unsigned long flags = 0;
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u32 acpi_state = acpi_target_sleep_state;
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ACPI_FLUSH_CPU_CACHE();
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/* Do arch specific saving of state. */
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if (acpi_state == ACPI_STATE_S3) {
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int error = acpi_save_state_mem();
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if (error)
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return error;
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}
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local_irq_save(flags);
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acpi_enable_wakeup_device(acpi_state);
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switch (acpi_state) {
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case ACPI_STATE_S1:
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barrier();
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status = acpi_enter_sleep_state(acpi_state);
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break;
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case ACPI_STATE_S3:
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do_suspend_lowlevel();
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break;
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}
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/* If ACPI is not enabled by the BIOS, we need to enable it here. */
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if (set_sci_en_on_resume)
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acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
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else
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acpi_enable();
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/* Reprogram control registers and execute _BFS */
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acpi_leave_sleep_state_prep(acpi_state);
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/* ACPI 3.0 specs (P62) says that it's the responsibility
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* of the OSPM to clear the status bit [ implying that the
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* POWER_BUTTON event should not reach userspace ]
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*/
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if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
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acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
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/*
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* Disable and clear GPE status before interrupt is enabled. Some GPEs
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* (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
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* acpi_leave_sleep_state will reenable specific GPEs later
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*/
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acpi_disable_all_gpes();
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/* Allow EC transactions to happen. */
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acpi_ec_unblock_transactions_early();
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local_irq_restore(flags);
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printk(KERN_DEBUG "Back to C!\n");
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/* restore processor state */
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if (acpi_state == ACPI_STATE_S3)
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acpi_restore_state_mem();
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return ACPI_SUCCESS(status) ? 0 : -EFAULT;
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}
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static void acpi_suspend_finish(void)
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{
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acpi_ec_unblock_transactions();
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acpi_pm_finish();
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}
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static int acpi_suspend_state_valid(suspend_state_t pm_state)
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{
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u32 acpi_state;
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switch (pm_state) {
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case PM_SUSPEND_ON:
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case PM_SUSPEND_STANDBY:
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case PM_SUSPEND_MEM:
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acpi_state = acpi_suspend_states[pm_state];
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return sleep_states[acpi_state];
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default:
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return 0;
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}
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}
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static struct platform_suspend_ops acpi_suspend_ops = {
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.valid = acpi_suspend_state_valid,
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.begin = acpi_suspend_begin,
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.prepare_late = acpi_pm_prepare,
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.enter = acpi_suspend_enter,
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.wake = acpi_suspend_finish,
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.end = acpi_pm_end,
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};
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/**
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* acpi_suspend_begin_old - Set the target system sleep state to the
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* state associated with given @pm_state, if supported, and
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* execute the _PTS control method. This function is used if the
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* pre-ACPI 2.0 suspend ordering has been requested.
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*/
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static int acpi_suspend_begin_old(suspend_state_t pm_state)
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{
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int error = acpi_suspend_begin(pm_state);
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if (!error)
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error = __acpi_pm_prepare();
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return error;
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}
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/*
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* The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
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* been requested.
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*/
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static struct platform_suspend_ops acpi_suspend_ops_old = {
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.valid = acpi_suspend_state_valid,
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.begin = acpi_suspend_begin_old,
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.prepare_late = acpi_pm_freeze,
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.enter = acpi_suspend_enter,
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.wake = acpi_suspend_finish,
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.end = acpi_pm_end,
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.recover = acpi_pm_finish,
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};
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static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
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{
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old_suspend_ordering = true;
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return 0;
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}
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static int __init init_set_sci_en_on_resume(const struct dmi_system_id *d)
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{
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set_sci_en_on_resume = true;
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return 0;
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}
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static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
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{
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.callback = init_old_suspend_ordering,
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.ident = "Abit KN9 (nForce4 variant)",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
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DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
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},
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},
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{
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.callback = init_old_suspend_ordering,
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.ident = "HP xw4600 Workstation",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
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DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
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},
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},
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{
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.callback = init_set_sci_en_on_resume,
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.ident = "Apple MacBook 1,1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "MacBook1,1"),
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},
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},
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{
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.callback = init_set_sci_en_on_resume,
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.ident = "Apple MacMini 1,1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
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},
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},
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{
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.callback = init_old_suspend_ordering,
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.ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
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DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
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},
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},
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{
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.callback = init_set_sci_en_on_resume,
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.ident = "Toshiba Satellite L300",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
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DMI_MATCH(DMI_PRODUCT_NAME, "Satellite L300"),
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},
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},
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{
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.callback = init_set_sci_en_on_resume,
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.ident = "Hewlett-Packard HP G7000 Notebook PC",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
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DMI_MATCH(DMI_PRODUCT_NAME, "HP G7000 Notebook PC"),
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},
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},
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{
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.callback = init_set_sci_en_on_resume,
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.ident = "Hewlett-Packard HP Pavilion dv3 Notebook PC",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
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DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dv3 Notebook PC"),
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},
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},
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{
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.callback = init_set_sci_en_on_resume,
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.ident = "Hewlett-Packard Pavilion dv4",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
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DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dv4"),
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},
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},
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{
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.callback = init_set_sci_en_on_resume,
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.ident = "Hewlett-Packard Pavilion dv7",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
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DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dv7"),
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},
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},
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{
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.callback = init_set_sci_en_on_resume,
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.ident = "Hewlett-Packard Compaq Presario C700 Notebook PC",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
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DMI_MATCH(DMI_PRODUCT_NAME, "Compaq Presario C700 Notebook PC"),
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},
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},
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{
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.callback = init_set_sci_en_on_resume,
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.ident = "Hewlett-Packard Compaq Presario CQ40 Notebook PC",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
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DMI_MATCH(DMI_PRODUCT_NAME, "Compaq Presario CQ40 Notebook PC"),
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},
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},
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{
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.callback = init_set_sci_en_on_resume,
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.ident = "Lenovo ThinkPad T410",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
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DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T410"),
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},
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},
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{
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.callback = init_set_sci_en_on_resume,
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.ident = "Lenovo ThinkPad T510",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
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DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T510"),
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},
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},
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{
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.callback = init_set_sci_en_on_resume,
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.ident = "Lenovo ThinkPad W510",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
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DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W510"),
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},
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},
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{
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.callback = init_set_sci_en_on_resume,
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.ident = "Lenovo ThinkPad X201[s]",
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.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
|
|
DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201"),
|
|
},
|
|
},
|
|
{
|
|
.callback = init_old_suspend_ordering,
|
|
.ident = "Panasonic CF51-2L",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR,
|
|
"Matsushita Electric Industrial Co.,Ltd."),
|
|
DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
|
|
},
|
|
},
|
|
{
|
|
.callback = init_set_sci_en_on_resume,
|
|
.ident = "Dell Studio 1558",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1558"),
|
|
},
|
|
},
|
|
{
|
|
.callback = init_set_sci_en_on_resume,
|
|
.ident = "Dell Studio 1557",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1557"),
|
|
},
|
|
},
|
|
{
|
|
.callback = init_set_sci_en_on_resume,
|
|
.ident = "Dell Studio 1555",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1555"),
|
|
},
|
|
},
|
|
{},
|
|
};
|
|
#endif /* CONFIG_SUSPEND */
|
|
|
|
#ifdef CONFIG_HIBERNATION
|
|
/*
|
|
* The ACPI specification wants us to save NVS memory regions during hibernation
|
|
* and to restore them during the subsequent resume. However, it is not certain
|
|
* if this mechanism is going to work on all machines, so we allow the user to
|
|
* disable this mechanism using the 'acpi_sleep=s4_nonvs' kernel command line
|
|
* option.
|
|
*/
|
|
static bool s4_no_nvs;
|
|
|
|
void __init acpi_s4_no_nvs(void)
|
|
{
|
|
s4_no_nvs = true;
|
|
}
|
|
|
|
static unsigned long s4_hardware_signature;
|
|
static struct acpi_table_facs *facs;
|
|
static bool nosigcheck;
|
|
|
|
void __init acpi_no_s4_hw_signature(void)
|
|
{
|
|
nosigcheck = true;
|
|
}
|
|
|
|
static int acpi_hibernation_begin(void)
|
|
{
|
|
int error;
|
|
|
|
error = s4_no_nvs ? 0 : hibernate_nvs_alloc();
|
|
if (!error) {
|
|
acpi_target_sleep_state = ACPI_STATE_S4;
|
|
acpi_sleep_tts_switch(acpi_target_sleep_state);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
static int acpi_hibernation_pre_snapshot(void)
|
|
{
|
|
int error = acpi_pm_prepare();
|
|
|
|
if (!error)
|
|
hibernate_nvs_save();
|
|
|
|
return error;
|
|
}
|
|
|
|
static int acpi_hibernation_enter(void)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
unsigned long flags = 0;
|
|
|
|
ACPI_FLUSH_CPU_CACHE();
|
|
|
|
local_irq_save(flags);
|
|
acpi_enable_wakeup_device(ACPI_STATE_S4);
|
|
/* This shouldn't return. If it returns, we have a problem */
|
|
status = acpi_enter_sleep_state(ACPI_STATE_S4);
|
|
/* Reprogram control registers and execute _BFS */
|
|
acpi_leave_sleep_state_prep(ACPI_STATE_S4);
|
|
local_irq_restore(flags);
|
|
|
|
return ACPI_SUCCESS(status) ? 0 : -EFAULT;
|
|
}
|
|
|
|
static void acpi_hibernation_finish(void)
|
|
{
|
|
hibernate_nvs_free();
|
|
acpi_ec_unblock_transactions();
|
|
acpi_pm_finish();
|
|
}
|
|
|
|
static void acpi_hibernation_leave(void)
|
|
{
|
|
/*
|
|
* If ACPI is not enabled by the BIOS and the boot kernel, we need to
|
|
* enable it here.
|
|
*/
|
|
acpi_enable();
|
|
/* Reprogram control registers and execute _BFS */
|
|
acpi_leave_sleep_state_prep(ACPI_STATE_S4);
|
|
/* Check the hardware signature */
|
|
if (facs && s4_hardware_signature != facs->hardware_signature) {
|
|
printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
|
|
"cannot resume!\n");
|
|
panic("ACPI S4 hardware signature mismatch");
|
|
}
|
|
/* Restore the NVS memory area */
|
|
hibernate_nvs_restore();
|
|
/* Allow EC transactions to happen. */
|
|
acpi_ec_unblock_transactions_early();
|
|
}
|
|
|
|
static void acpi_pm_thaw(void)
|
|
{
|
|
acpi_ec_unblock_transactions();
|
|
acpi_enable_all_runtime_gpes();
|
|
}
|
|
|
|
static struct platform_hibernation_ops acpi_hibernation_ops = {
|
|
.begin = acpi_hibernation_begin,
|
|
.end = acpi_pm_end,
|
|
.pre_snapshot = acpi_hibernation_pre_snapshot,
|
|
.finish = acpi_hibernation_finish,
|
|
.prepare = acpi_pm_prepare,
|
|
.enter = acpi_hibernation_enter,
|
|
.leave = acpi_hibernation_leave,
|
|
.pre_restore = acpi_pm_freeze,
|
|
.restore_cleanup = acpi_pm_thaw,
|
|
};
|
|
|
|
/**
|
|
* acpi_hibernation_begin_old - Set the target system sleep state to
|
|
* ACPI_STATE_S4 and execute the _PTS control method. This
|
|
* function is used if the pre-ACPI 2.0 suspend ordering has been
|
|
* requested.
|
|
*/
|
|
static int acpi_hibernation_begin_old(void)
|
|
{
|
|
int error;
|
|
/*
|
|
* The _TTS object should always be evaluated before the _PTS object.
|
|
* When the old_suspended_ordering is true, the _PTS object is
|
|
* evaluated in the acpi_sleep_prepare.
|
|
*/
|
|
acpi_sleep_tts_switch(ACPI_STATE_S4);
|
|
|
|
error = acpi_sleep_prepare(ACPI_STATE_S4);
|
|
|
|
if (!error) {
|
|
if (!s4_no_nvs)
|
|
error = hibernate_nvs_alloc();
|
|
if (!error)
|
|
acpi_target_sleep_state = ACPI_STATE_S4;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
static int acpi_hibernation_pre_snapshot_old(void)
|
|
{
|
|
acpi_pm_freeze();
|
|
hibernate_nvs_save();
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
|
|
* been requested.
|
|
*/
|
|
static struct platform_hibernation_ops acpi_hibernation_ops_old = {
|
|
.begin = acpi_hibernation_begin_old,
|
|
.end = acpi_pm_end,
|
|
.pre_snapshot = acpi_hibernation_pre_snapshot_old,
|
|
.finish = acpi_hibernation_finish,
|
|
.prepare = acpi_pm_freeze,
|
|
.enter = acpi_hibernation_enter,
|
|
.leave = acpi_hibernation_leave,
|
|
.pre_restore = acpi_pm_freeze,
|
|
.restore_cleanup = acpi_pm_thaw,
|
|
.recover = acpi_pm_finish,
|
|
};
|
|
#endif /* CONFIG_HIBERNATION */
|
|
|
|
int acpi_suspend(u32 acpi_state)
|
|
{
|
|
suspend_state_t states[] = {
|
|
[1] = PM_SUSPEND_STANDBY,
|
|
[3] = PM_SUSPEND_MEM,
|
|
[5] = PM_SUSPEND_MAX
|
|
};
|
|
|
|
if (acpi_state < 6 && states[acpi_state])
|
|
return pm_suspend(states[acpi_state]);
|
|
if (acpi_state == 4)
|
|
return hibernate();
|
|
return -EINVAL;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
/**
|
|
* acpi_pm_device_sleep_state - return preferred power state of ACPI device
|
|
* in the system sleep state given by %acpi_target_sleep_state
|
|
* @dev: device to examine; its driver model wakeup flags control
|
|
* whether it should be able to wake up the system
|
|
* @d_min_p: used to store the upper limit of allowed states range
|
|
* Return value: preferred power state of the device on success, -ENODEV on
|
|
* failure (ie. if there's no 'struct acpi_device' for @dev)
|
|
*
|
|
* Find the lowest power (highest number) ACPI device power state that
|
|
* device @dev can be in while the system is in the sleep state represented
|
|
* by %acpi_target_sleep_state. If @wake is nonzero, the device should be
|
|
* able to wake up the system from this sleep state. If @d_min_p is set,
|
|
* the highest power (lowest number) device power state of @dev allowed
|
|
* in this system sleep state is stored at the location pointed to by it.
|
|
*
|
|
* The caller must ensure that @dev is valid before using this function.
|
|
* The caller is also responsible for figuring out if the device is
|
|
* supposed to be able to wake up the system and passing this information
|
|
* via @wake.
|
|
*/
|
|
|
|
int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
|
|
{
|
|
acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
|
|
struct acpi_device *adev;
|
|
char acpi_method[] = "_SxD";
|
|
unsigned long long d_min, d_max;
|
|
|
|
if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
|
|
printk(KERN_DEBUG "ACPI handle has no context!\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
acpi_method[2] = '0' + acpi_target_sleep_state;
|
|
/*
|
|
* If the sleep state is S0, we will return D3, but if the device has
|
|
* _S0W, we will use the value from _S0W
|
|
*/
|
|
d_min = ACPI_STATE_D0;
|
|
d_max = ACPI_STATE_D3;
|
|
|
|
/*
|
|
* If present, _SxD methods return the minimum D-state (highest power
|
|
* state) we can use for the corresponding S-states. Otherwise, the
|
|
* minimum D-state is D0 (ACPI 3.x).
|
|
*
|
|
* NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
|
|
* provided -- that's our fault recovery, we ignore retval.
|
|
*/
|
|
if (acpi_target_sleep_state > ACPI_STATE_S0)
|
|
acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
|
|
|
|
/*
|
|
* If _PRW says we can wake up the system from the target sleep state,
|
|
* the D-state returned by _SxD is sufficient for that (we assume a
|
|
* wakeup-aware driver if wake is set). Still, if _SxW exists
|
|
* (ACPI 3.x), it should return the maximum (lowest power) D-state that
|
|
* can wake the system. _S0W may be valid, too.
|
|
*/
|
|
if (acpi_target_sleep_state == ACPI_STATE_S0 ||
|
|
(device_may_wakeup(dev) && adev->wakeup.state.enabled &&
|
|
adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
|
|
acpi_status status;
|
|
|
|
acpi_method[3] = 'W';
|
|
status = acpi_evaluate_integer(handle, acpi_method, NULL,
|
|
&d_max);
|
|
if (ACPI_FAILURE(status)) {
|
|
d_max = d_min;
|
|
} else if (d_max < d_min) {
|
|
/* Warn the user of the broken DSDT */
|
|
printk(KERN_WARNING "ACPI: Wrong value from %s\n",
|
|
acpi_method);
|
|
/* Sanitize it */
|
|
d_min = d_max;
|
|
}
|
|
}
|
|
|
|
if (d_min_p)
|
|
*d_min_p = d_min;
|
|
return d_max;
|
|
}
|
|
|
|
/**
|
|
* acpi_pm_device_sleep_wake - enable or disable the system wake-up
|
|
* capability of given device
|
|
* @dev: device to handle
|
|
* @enable: 'true' - enable, 'false' - disable the wake-up capability
|
|
*/
|
|
int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
|
|
{
|
|
acpi_handle handle;
|
|
struct acpi_device *adev;
|
|
int error;
|
|
|
|
if (!device_can_wakeup(dev))
|
|
return -EINVAL;
|
|
|
|
handle = DEVICE_ACPI_HANDLE(dev);
|
|
if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
|
|
dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (enable) {
|
|
error = acpi_enable_wakeup_device_power(adev,
|
|
acpi_target_sleep_state);
|
|
if (!error)
|
|
acpi_enable_gpe(adev->wakeup.gpe_device,
|
|
adev->wakeup.gpe_number,
|
|
ACPI_GPE_TYPE_WAKE);
|
|
} else {
|
|
acpi_disable_gpe(adev->wakeup.gpe_device, adev->wakeup.gpe_number,
|
|
ACPI_GPE_TYPE_WAKE);
|
|
error = acpi_disable_wakeup_device_power(adev);
|
|
}
|
|
if (!error)
|
|
dev_info(dev, "wake-up capability %s by ACPI\n",
|
|
enable ? "enabled" : "disabled");
|
|
|
|
return error;
|
|
}
|
|
#endif
|
|
|
|
static void acpi_power_off_prepare(void)
|
|
{
|
|
/* Prepare to power off the system */
|
|
acpi_sleep_prepare(ACPI_STATE_S5);
|
|
acpi_disable_all_gpes();
|
|
}
|
|
|
|
static void acpi_power_off(void)
|
|
{
|
|
/* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
|
|
printk(KERN_DEBUG "%s called\n", __func__);
|
|
local_irq_disable();
|
|
acpi_enable_wakeup_device(ACPI_STATE_S5);
|
|
acpi_enter_sleep_state(ACPI_STATE_S5);
|
|
}
|
|
|
|
/*
|
|
* ACPI 2.0 created the optional _GTS and _BFS,
|
|
* but industry adoption has been neither rapid nor broad.
|
|
*
|
|
* Linux gets into trouble when it executes poorly validated
|
|
* paths through the BIOS, so disable _GTS and _BFS by default,
|
|
* but do speak up and offer the option to enable them.
|
|
*/
|
|
void __init acpi_gts_bfs_check(void)
|
|
{
|
|
acpi_handle dummy;
|
|
|
|
if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy)))
|
|
{
|
|
printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n");
|
|
printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, "
|
|
"please notify linux-acpi@vger.kernel.org\n");
|
|
}
|
|
if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy)))
|
|
{
|
|
printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n");
|
|
printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, "
|
|
"please notify linux-acpi@vger.kernel.org\n");
|
|
}
|
|
}
|
|
|
|
int __init acpi_sleep_init(void)
|
|
{
|
|
acpi_status status;
|
|
u8 type_a, type_b;
|
|
#ifdef CONFIG_SUSPEND
|
|
int i = 0;
|
|
|
|
dmi_check_system(acpisleep_dmi_table);
|
|
#endif
|
|
|
|
if (acpi_disabled)
|
|
return 0;
|
|
|
|
sleep_states[ACPI_STATE_S0] = 1;
|
|
printk(KERN_INFO PREFIX "(supports S0");
|
|
|
|
#ifdef CONFIG_SUSPEND
|
|
for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
|
|
status = acpi_get_sleep_type_data(i, &type_a, &type_b);
|
|
if (ACPI_SUCCESS(status)) {
|
|
sleep_states[i] = 1;
|
|
printk(" S%d", i);
|
|
}
|
|
}
|
|
|
|
suspend_set_ops(old_suspend_ordering ?
|
|
&acpi_suspend_ops_old : &acpi_suspend_ops);
|
|
#endif
|
|
|
|
#ifdef CONFIG_HIBERNATION
|
|
status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
|
|
if (ACPI_SUCCESS(status)) {
|
|
hibernation_set_ops(old_suspend_ordering ?
|
|
&acpi_hibernation_ops_old : &acpi_hibernation_ops);
|
|
sleep_states[ACPI_STATE_S4] = 1;
|
|
printk(" S4");
|
|
if (!nosigcheck) {
|
|
acpi_get_table(ACPI_SIG_FACS, 1,
|
|
(struct acpi_table_header **)&facs);
|
|
if (facs)
|
|
s4_hardware_signature =
|
|
facs->hardware_signature;
|
|
}
|
|
}
|
|
#endif
|
|
status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
|
|
if (ACPI_SUCCESS(status)) {
|
|
sleep_states[ACPI_STATE_S5] = 1;
|
|
printk(" S5");
|
|
pm_power_off_prepare = acpi_power_off_prepare;
|
|
pm_power_off = acpi_power_off;
|
|
}
|
|
printk(")\n");
|
|
/*
|
|
* Register the tts_notifier to reboot notifier list so that the _TTS
|
|
* object can also be evaluated when the system enters S5.
|
|
*/
|
|
register_reboot_notifier(&tts_notifier);
|
|
acpi_gts_bfs_check();
|
|
return 0;
|
|
}
|