2009-06-10 07:27:12 +08:00
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/*
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* kernel/power/suspend.c - Suspend to RAM and standby functionality.
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*
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* Copyright (c) 2003 Patrick Mochel
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* Copyright (c) 2003 Open Source Development Lab
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* Copyright (c) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
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*
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* This file is released under the GPLv2.
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*/
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#include <linux/string.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/console.h>
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#include <linux/cpu.h>
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#include <linux/syscalls.h>
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#include "power.h"
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const char *const pm_states[PM_SUSPEND_MAX] = {
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[PM_SUSPEND_STANDBY] = "standby",
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[PM_SUSPEND_MEM] = "mem",
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};
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static struct platform_suspend_ops *suspend_ops;
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/**
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* suspend_set_ops - Set the global suspend method table.
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* @ops: Pointer to ops structure.
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*/
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void suspend_set_ops(struct platform_suspend_ops *ops)
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{
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mutex_lock(&pm_mutex);
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suspend_ops = ops;
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mutex_unlock(&pm_mutex);
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}
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bool valid_state(suspend_state_t state)
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{
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/*
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* All states need lowlevel support and need to be valid to the lowlevel
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* implementation, no valid callback implies that none are valid.
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*/
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return suspend_ops && suspend_ops->valid && suspend_ops->valid(state);
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}
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/**
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* suspend_valid_only_mem - generic memory-only valid callback
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*
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* Platform drivers that implement mem suspend only and only need
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* to check for that in their .valid callback can use this instead
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* of rolling their own .valid callback.
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*/
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int suspend_valid_only_mem(suspend_state_t state)
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{
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return state == PM_SUSPEND_MEM;
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}
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static int suspend_test(int level)
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{
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#ifdef CONFIG_PM_DEBUG
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if (pm_test_level == level) {
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printk(KERN_INFO "suspend debug: Waiting for 5 seconds.\n");
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mdelay(5000);
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return 1;
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}
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#endif /* !CONFIG_PM_DEBUG */
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return 0;
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}
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/**
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* suspend_prepare - Do prep work before entering low-power state.
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*
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* This is common code that is called for each state that we're entering.
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* Run suspend notifiers, allocate a console and stop all processes.
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*/
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static int suspend_prepare(void)
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{
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int error;
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if (!suspend_ops || !suspend_ops->enter)
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return -EPERM;
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pm_prepare_console();
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error = pm_notifier_call_chain(PM_SUSPEND_PREPARE);
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if (error)
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goto Finish;
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error = usermodehelper_disable();
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if (error)
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goto Finish;
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error = suspend_freeze_processes();
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if (!error)
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return 0;
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suspend_thaw_processes();
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usermodehelper_enable();
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Finish:
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pm_notifier_call_chain(PM_POST_SUSPEND);
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pm_restore_console();
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return error;
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}
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/* default implementation */
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void __attribute__ ((weak)) arch_suspend_disable_irqs(void)
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{
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local_irq_disable();
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}
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/* default implementation */
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void __attribute__ ((weak)) arch_suspend_enable_irqs(void)
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{
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local_irq_enable();
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}
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/**
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* suspend_enter - enter the desired system sleep state.
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* @state: state to enter
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*
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* This function should be called after devices have been suspended.
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*/
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static int suspend_enter(suspend_state_t state)
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{
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int error;
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if (suspend_ops->prepare) {
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error = suspend_ops->prepare();
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if (error)
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return error;
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}
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error = dpm_suspend_noirq(PMSG_SUSPEND);
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if (error) {
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printk(KERN_ERR "PM: Some devices failed to power down\n");
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goto Platfrom_finish;
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}
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if (suspend_ops->prepare_late) {
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error = suspend_ops->prepare_late();
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if (error)
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goto Power_up_devices;
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}
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if (suspend_test(TEST_PLATFORM))
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goto Platform_wake;
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error = disable_nonboot_cpus();
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if (error || suspend_test(TEST_CPUS))
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goto Enable_cpus;
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arch_suspend_disable_irqs();
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BUG_ON(!irqs_disabled());
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error = sysdev_suspend(PMSG_SUSPEND);
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if (!error) {
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if (!suspend_test(TEST_CORE))
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error = suspend_ops->enter(state);
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sysdev_resume();
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}
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arch_suspend_enable_irqs();
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BUG_ON(irqs_disabled());
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Enable_cpus:
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enable_nonboot_cpus();
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Platform_wake:
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if (suspend_ops->wake)
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suspend_ops->wake();
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Power_up_devices:
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dpm_resume_noirq(PMSG_RESUME);
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Platfrom_finish:
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if (suspend_ops->finish)
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suspend_ops->finish();
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return error;
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}
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/**
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* suspend_devices_and_enter - suspend devices and enter the desired system
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* sleep state.
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* @state: state to enter
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*/
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int suspend_devices_and_enter(suspend_state_t state)
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{
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int error;
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2010-03-06 05:42:13 +08:00
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gfp_t saved_mask;
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2009-06-10 07:27:12 +08:00
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if (!suspend_ops)
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return -ENOSYS;
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if (suspend_ops->begin) {
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error = suspend_ops->begin(state);
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if (error)
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goto Close;
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}
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suspend_console();
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2010-03-06 05:42:13 +08:00
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saved_mask = clear_gfp_allowed_mask(GFP_IOFS);
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2009-06-10 07:27:12 +08:00
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suspend_test_start();
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error = dpm_suspend_start(PMSG_SUSPEND);
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if (error) {
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printk(KERN_ERR "PM: Some devices failed to suspend\n");
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goto Recover_platform;
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}
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suspend_test_finish("suspend devices");
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if (suspend_test(TEST_DEVICES))
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goto Recover_platform;
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suspend_enter(state);
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Resume_devices:
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suspend_test_start();
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dpm_resume_end(PMSG_RESUME);
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suspend_test_finish("resume devices");
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2010-03-06 05:42:13 +08:00
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set_gfp_allowed_mask(saved_mask);
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2009-06-10 07:27:12 +08:00
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resume_console();
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Close:
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if (suspend_ops->end)
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suspend_ops->end();
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return error;
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Recover_platform:
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if (suspend_ops->recover)
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suspend_ops->recover();
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goto Resume_devices;
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}
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/**
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* suspend_finish - Do final work before exiting suspend sequence.
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*
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* Call platform code to clean up, restart processes, and free the
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* console that we've allocated. This is not called for suspend-to-disk.
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*/
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static void suspend_finish(void)
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{
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suspend_thaw_processes();
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usermodehelper_enable();
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pm_notifier_call_chain(PM_POST_SUSPEND);
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pm_restore_console();
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}
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/**
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* enter_state - Do common work of entering low-power state.
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* @state: pm_state structure for state we're entering.
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*
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* Make sure we're the only ones trying to enter a sleep state. Fail
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* if someone has beat us to it, since we don't want anything weird to
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* happen when we wake up.
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* Then, do the setup for suspend, enter the state, and cleaup (after
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* we've woken up).
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*/
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int enter_state(suspend_state_t state)
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{
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int error;
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if (!valid_state(state))
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return -ENODEV;
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if (!mutex_trylock(&pm_mutex))
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return -EBUSY;
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printk(KERN_INFO "PM: Syncing filesystems ... ");
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sys_sync();
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printk("done.\n");
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pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]);
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error = suspend_prepare();
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if (error)
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goto Unlock;
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if (suspend_test(TEST_FREEZER))
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goto Finish;
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pr_debug("PM: Entering %s sleep\n", pm_states[state]);
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error = suspend_devices_and_enter(state);
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Finish:
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pr_debug("PM: Finishing wakeup.\n");
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suspend_finish();
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Unlock:
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mutex_unlock(&pm_mutex);
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return error;
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}
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/**
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* pm_suspend - Externally visible function for suspending system.
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* @state: Enumerated value of state to enter.
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*
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* Determine whether or not value is within range, get state
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* structure, and enter (above).
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*/
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int pm_suspend(suspend_state_t state)
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{
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if (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX)
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return enter_state(state);
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return -EINVAL;
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}
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EXPORT_SYMBOL(pm_suspend);
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