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bundle.h

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  • sleep.c 20.22 KiB
    /*
     * sleep.c - ACPI sleep support.
     *
     * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
     * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
     * Copyright (c) 2000-2003 Patrick Mochel
     * Copyright (c) 2003 Open Source Development Lab
     *
     * This file is released under the GPLv2.
     *
     */
    
    #include <linux/delay.h>
    #include <linux/irq.h>
    #include <linux/dmi.h>
    #include <linux/device.h>
    #include <linux/suspend.h>
    #include <linux/reboot.h>
    #include <linux/acpi.h>
    #include <linux/module.h>
    
    #include <asm/io.h>
    
    #include <acpi/acpi_bus.h>
    #include <acpi/acpi_drivers.h>
    
    #include "internal.h"
    #include "sleep.h"
    
    static u8 sleep_states[ACPI_S_STATE_COUNT];
    
    static void acpi_sleep_tts_switch(u32 acpi_state)
    {
    	union acpi_object in_arg = { ACPI_TYPE_INTEGER };
    	struct acpi_object_list arg_list = { 1, &in_arg };
    	acpi_status status = AE_OK;
    
    	in_arg.integer.value = acpi_state;
    	status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
    	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
    		/*
    		 * OS can't evaluate the _TTS object correctly. Some warning
    		 * message will be printed. But it won't break anything.
    		 */
    		printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
    	}
    }
    
    static int tts_notify_reboot(struct notifier_block *this,
    			unsigned long code, void *x)
    {
    	acpi_sleep_tts_switch(ACPI_STATE_S5);
    	return NOTIFY_DONE;
    }
    
    static struct notifier_block tts_notifier = {
    	.notifier_call	= tts_notify_reboot,
    	.next		= NULL,
    	.priority	= 0,
    };
    
    static int acpi_sleep_prepare(u32 acpi_state)
    {
    #ifdef CONFIG_ACPI_SLEEP
    	/* do we have a wakeup address for S2 and S3? */
    	if (acpi_state == ACPI_STATE_S3) {
    		if (!acpi_wakeup_address)
    			return -EFAULT;
    		acpi_set_firmware_waking_vector(acpi_wakeup_address);
    
    	}
    	ACPI_FLUSH_CPU_CACHE();
    #endif
    	printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
    		acpi_state);
    	acpi_enable_wakeup_devices(acpi_state);
    	acpi_enter_sleep_state_prep(acpi_state);
    	return 0;
    }
    
    static bool acpi_sleep_state_supported(u8 sleep_state)
    {
    	acpi_status status;
    	u8 type_a, type_b;
    
    	status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b);
    	return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware
    		|| (acpi_gbl_FADT.sleep_control.address
    			&& acpi_gbl_FADT.sleep_status.address));
    }
    
    #ifdef CONFIG_ACPI_SLEEP
    static u32 acpi_target_sleep_state = ACPI_STATE_S0;
    
    u32 acpi_target_system_state(void)
    {
    	return acpi_target_sleep_state;
    }
    
    static bool pwr_btn_event_pending;
    
    /*
     * The ACPI specification wants us to save NVS memory regions during hibernation
     * and to restore them during the subsequent resume.  Windows does that also for
     * suspend to RAM.  However, it is known that this mechanism does not work on
     * all machines, so we allow the user to disable it with the help of the
     * 'acpi_sleep=nonvs' kernel command line option.
     */
    static bool nvs_nosave;
    
    void __init acpi_nvs_nosave(void)
    {
    	nvs_nosave = true;
    }
    
    /*
     * The ACPI specification wants us to save NVS memory regions during hibernation
     * but says nothing about saving NVS during S3.  Not all versions of Windows
     * save NVS on S3 suspend either, and it is clear that not all systems need
     * NVS to be saved at S3 time.  To improve suspend/resume time, allow the
     * user to disable saving NVS on S3 if their system does not require it, but
     * continue to save/restore NVS for S4 as specified.
     */
    static bool nvs_nosave_s3;
    
    void __init acpi_nvs_nosave_s3(void)
    {
    	nvs_nosave_s3 = true;
    }
    
    /*
     * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
     * user to request that behavior by using the 'acpi_old_suspend_ordering'
     * kernel command line option that causes the following variable to be set.
     */
    static bool old_suspend_ordering;
    
    void __init acpi_old_suspend_ordering(void)
    {
    	old_suspend_ordering = true;
    }
    
    static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
    {
    	acpi_old_suspend_ordering();
    	return 0;
    }
    
    static int __init init_nvs_nosave(const struct dmi_system_id *d)
    {
    	acpi_nvs_nosave();
    	return 0;
    }
    
    static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
    	{
    	.callback = init_old_suspend_ordering,
    	.ident = "Abit KN9 (nForce4 variant)",
    	.matches = {
    		DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
    		DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
    		},
    	},
    	{
    	.callback = init_old_suspend_ordering,
    	.ident = "HP xw4600 Workstation",
    	.matches = {
    		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
    		DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
    		},
    	},
    	{
    	.callback = init_old_suspend_ordering,
    	.ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
    	.matches = {
    		DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
    		DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
    		},
    	},
    	{
    	.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_nvs_nosave,
    	.ident = "Sony Vaio VGN-FW41E_H",
    	.matches = {
    		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
    		DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
    		},
    	},
    	{
    	.callback = init_nvs_nosave,
    	.ident = "Sony Vaio VGN-FW21E",
    	.matches = {
    		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
    		DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
    		},
    	},
    	{
    	.callback = init_nvs_nosave,
    	.ident = "Sony Vaio VGN-FW21M",
    	.matches = {
    		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
    		DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"),
    		},
    	},
    	{
    	.callback = init_nvs_nosave,
    	.ident = "Sony Vaio VPCEB17FX",
    	.matches = {
    		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
    		DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
    		},
    	},
    	{
    	.callback = init_nvs_nosave,
    	.ident = "Sony Vaio VGN-SR11M",
    	.matches = {
    		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
    		DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
    		},
    	},
    	{
    	.callback = init_nvs_nosave,
    	.ident = "Everex StepNote Series",
    	.matches = {
    		DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
    		DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
    		},
    	},
    	{
    	.callback = init_nvs_nosave,
    	.ident = "Sony Vaio VPCEB1Z1E",
    	.matches = {
    		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
    		DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
    		},
    	},
    	{
    	.callback = init_nvs_nosave,
    	.ident = "Sony Vaio VGN-NW130D",
    	.matches = {
    		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
    		DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
    		},
    	},
    	{
    	.callback = init_nvs_nosave,
    	.ident = "Sony Vaio VPCCW29FX",
    	.matches = {
    		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
    		DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
    		},
    	},
    	{
    	.callback = init_nvs_nosave,
    	.ident = "Averatec AV1020-ED2",
    	.matches = {
    		DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
    		DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
    		},
    	},
    	{
    	.callback = init_old_suspend_ordering,
    	.ident = "Asus A8N-SLI DELUXE",
    	.matches = {
    		DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
    		DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
    		},
    	},
    	{
    	.callback = init_old_suspend_ordering,
    	.ident = "Asus A8N-SLI Premium",
    	.matches = {
    		DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
    		DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
    		},
    	},
    	{
    	.callback = init_nvs_nosave,
    	.ident = "Sony Vaio VGN-SR26GN_P",
    	.matches = {
    		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
    		DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
    		},
    	},
    	{
    	.callback = init_nvs_nosave,
    	.ident = "Sony Vaio VPCEB1S1E",
    	.matches = {
    		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
    		DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
    		},
    	},
    	{
    	.callback = init_nvs_nosave,
    	.ident = "Sony Vaio VGN-FW520F",
    	.matches = {
    		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
    		DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
    		},
    	},
    	{
    	.callback = init_nvs_nosave,
    	.ident = "Asus K54C",
    	.matches = {
    		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
    		DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
    		},
    	},
    	{
    	.callback = init_nvs_nosave,
    	.ident = "Asus K54HR",
    	.matches = {
    		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
    		DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
    		},
    	},
    	{},
    };
    
    static void acpi_sleep_dmi_check(void)
    {
    	dmi_check_system(acpisleep_dmi_table);
    }
    
    /**
     * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
     */
    static int acpi_pm_freeze(void)
    {
    	acpi_disable_all_gpes();
    	acpi_os_wait_events_complete();
    	acpi_ec_block_transactions();
    	return 0;
    }
    
    /**
     * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
     */
    static int acpi_pm_pre_suspend(void)
    {
    	acpi_pm_freeze();
    	return suspend_nvs_save();
    }
    
    /**
     *	__acpi_pm_prepare - Prepare the platform to enter the target state.
     *
     *	If necessary, set the firmware waking vector and do arch-specific
     *	nastiness to get the wakeup code to the waking vector.
     */
    static int __acpi_pm_prepare(void)
    {
    	int error = acpi_sleep_prepare(acpi_target_sleep_state);
    	if (error)
    		acpi_target_sleep_state = ACPI_STATE_S0;
    
    	return error;
    }
    
    /**
     *	acpi_pm_prepare - Prepare the platform to enter the target sleep
     *		state and disable the GPEs.
     */
    static int acpi_pm_prepare(void)
    {
    	int error = __acpi_pm_prepare();
    	if (!error)
    		error = acpi_pm_pre_suspend();
    
    	return error;
    }
    
    static int find_powerf_dev(struct device *dev, void *data)
    {
    	struct acpi_device *device = to_acpi_device(dev);
    	const char *hid = acpi_device_hid(device);
    
    	return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
    }
    
    /**
     *	acpi_pm_finish - Instruct the platform to leave a sleep state.
     *
     *	This is called after we wake back up (or if entering the sleep state
     *	failed).
     */
    static void acpi_pm_finish(void)
    {
    	struct device *pwr_btn_dev;
    	u32 acpi_state = acpi_target_sleep_state;
    
    	acpi_ec_unblock_transactions();
    	suspend_nvs_free();
    
    	if (acpi_state == ACPI_STATE_S0)
    		return;
    
    	printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
    		acpi_state);
    	acpi_disable_wakeup_devices(acpi_state);
    	acpi_leave_sleep_state(acpi_state);
    
    	/* reset firmware waking vector */
    	acpi_set_firmware_waking_vector((acpi_physical_address) 0);
    
    	acpi_target_sleep_state = ACPI_STATE_S0;
    
    	acpi_resume_power_resources();
    
    	/* If we were woken with the fixed power button, provide a small
    	 * hint to userspace in the form of a wakeup event on the fixed power
    	 * button device (if it can be found).
    	 *
    	 * We delay the event generation til now, as the PM layer requires
    	 * timekeeping to be running before we generate events. */
    	if (!pwr_btn_event_pending)
    		return;
    
    	pwr_btn_event_pending = false;
    	pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
    				      find_powerf_dev);
    	if (pwr_btn_dev) {
    		pm_wakeup_event(pwr_btn_dev, 0);
    		put_device(pwr_btn_dev);
    	}
    }
    
    /**
     *	acpi_pm_end - Finish up suspend sequence.
     */
    static void acpi_pm_end(void)
    {
    	/*
    	 * This is necessary in case acpi_pm_finish() is not called during a
    	 * failing transition to a sleep state.
    	 */
    	acpi_target_sleep_state = ACPI_STATE_S0;
    	acpi_sleep_tts_switch(acpi_target_sleep_state);
    }
    #else /* !CONFIG_ACPI_SLEEP */
    #define acpi_target_sleep_state	ACPI_STATE_S0
    static inline void acpi_sleep_dmi_check(void) {}
    #endif /* CONFIG_ACPI_SLEEP */
    
    #ifdef CONFIG_SUSPEND
    static u32 acpi_suspend_states[] = {
    	[PM_SUSPEND_ON] = ACPI_STATE_S0,
    	[PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
    	[PM_SUSPEND_MEM] = ACPI_STATE_S3,
    	[PM_SUSPEND_MAX] = ACPI_STATE_S5
    };
    
    /**
     *	acpi_suspend_begin - Set the target system sleep state to the state
     *		associated with given @pm_state, if supported.
     */
    static int acpi_suspend_begin(suspend_state_t pm_state)
    {
    	u32 acpi_state = acpi_suspend_states[pm_state];
    	int error = 0;
    
    	error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
    	if (error)
    		return error;
    
    	if (sleep_states[acpi_state]) {
    		acpi_target_sleep_state = acpi_state;
    		acpi_sleep_tts_switch(acpi_target_sleep_state);
    	} else {
    		printk(KERN_ERR "ACPI does not support this state: %d\n",
    			pm_state);
    		error = -ENOSYS;
    	}
    	return error;
    }
    
    /**
     *	acpi_suspend_enter - Actually enter a sleep state.
     *	@pm_state: ignored
     *
     *	Flush caches and go to sleep. For STR we have to call arch-specific
     *	assembly, which in turn call acpi_enter_sleep_state().
     *	It's unfortunate, but it works. Please fix if you're feeling frisky.
     */
    static int acpi_suspend_enter(suspend_state_t pm_state)
    {
    	acpi_status status = AE_OK;
    	u32 acpi_state = acpi_target_sleep_state;
    	int error;
    
    	ACPI_FLUSH_CPU_CACHE();
    
    	switch (acpi_state) {
    	case ACPI_STATE_S1:
    		barrier();
    		status = acpi_enter_sleep_state(acpi_state);
    		break;
    
    	case ACPI_STATE_S3:
    		error = acpi_suspend_lowlevel();
    		if (error)
    			return error;
    		pr_info(PREFIX "Low-level resume complete\n");
    		break;
    	}
    
    	/* This violates the spec but is required for bug compatibility. */
    	acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
    
    	/* Reprogram control registers */
    	acpi_leave_sleep_state_prep(acpi_state);
    
    	/* ACPI 3.0 specs (P62) says that it's the responsibility
    	 * of the OSPM to clear the status bit [ implying that the
    	 * POWER_BUTTON event should not reach userspace ]
    	 *
    	 * However, we do generate a small hint for userspace in the form of
    	 * a wakeup event. We flag this condition for now and generate the
    	 * event later, as we're currently too early in resume to be able to
    	 * generate wakeup events.
    	 */
    	if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
    		acpi_event_status pwr_btn_status;
    
    		acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
    
    		if (pwr_btn_status & ACPI_EVENT_FLAG_SET) {
    			acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
    			/* Flag for later */
    			pwr_btn_event_pending = true;
    		}
    	}
    
    	/*
    	 * Disable and clear GPE status before interrupt is enabled. Some GPEs
    	 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
    	 * acpi_leave_sleep_state will reenable specific GPEs later
    	 */
    	acpi_disable_all_gpes();
    	/* Allow EC transactions to happen. */
    	acpi_ec_unblock_transactions_early();
    
    	suspend_nvs_restore();
    
    	return ACPI_SUCCESS(status) ? 0 : -EFAULT;
    }
    
    static int acpi_suspend_state_valid(suspend_state_t pm_state)
    {
    	u32 acpi_state;
    
    	switch (pm_state) {
    	case PM_SUSPEND_ON:
    	case PM_SUSPEND_STANDBY:
    	case PM_SUSPEND_MEM:
    		acpi_state = acpi_suspend_states[pm_state];
    
    		return sleep_states[acpi_state];
    	default:
    		return 0;
    	}
    }
    
    static const struct platform_suspend_ops acpi_suspend_ops = {
    	.valid = acpi_suspend_state_valid,
    	.begin = acpi_suspend_begin,
    	.prepare_late = acpi_pm_prepare,
    	.enter = acpi_suspend_enter,
    	.wake = acpi_pm_finish,
    	.end = acpi_pm_end,
    };
    
    /**
     *	acpi_suspend_begin_old - Set the target system sleep state to the
     *		state associated with given @pm_state, if supported, and
     *		execute the _PTS control method.  This function is used if the
     *		pre-ACPI 2.0 suspend ordering has been requested.
     */
    static int acpi_suspend_begin_old(suspend_state_t pm_state)
    {
    	int error = acpi_suspend_begin(pm_state);
    	if (!error)
    		error = __acpi_pm_prepare();
    
    	return error;
    }
    
    /*
     * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
     * been requested.
     */
    static const struct platform_suspend_ops acpi_suspend_ops_old = {
    	.valid = acpi_suspend_state_valid,
    	.begin = acpi_suspend_begin_old,
    	.prepare_late = acpi_pm_pre_suspend,
    	.enter = acpi_suspend_enter,
    	.wake = acpi_pm_finish,
    	.end = acpi_pm_end,
    	.recover = acpi_pm_finish,
    };
    
    static void acpi_sleep_suspend_setup(void)
    {
    	int i;
    
    	for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
    		if (acpi_sleep_state_supported(i))
    			sleep_states[i] = 1;
    
    	suspend_set_ops(old_suspend_ordering ?
    		&acpi_suspend_ops_old : &acpi_suspend_ops);
    }
    #else /* !CONFIG_SUSPEND */
    static inline void acpi_sleep_suspend_setup(void) {}
    #endif /* !CONFIG_SUSPEND */
    
    #ifdef CONFIG_HIBERNATION
    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 = nvs_nosave ? 0 : suspend_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_enter(void)
    {
    	acpi_status status = AE_OK;
    
    	ACPI_FLUSH_CPU_CACHE();
    
    	/* This shouldn't return.  If it returns, we have a problem */
    	status = acpi_enter_sleep_state(ACPI_STATE_S4);
    	/* Reprogram control registers */
    	acpi_leave_sleep_state_prep(ACPI_STATE_S4);
    
    	return ACPI_SUCCESS(status) ? 0 : -EFAULT;
    }
    
    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 */
    	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 */
    	suspend_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 const struct platform_hibernation_ops acpi_hibernation_ops = {
    	.begin = acpi_hibernation_begin,
    	.end = acpi_pm_end,
    	.pre_snapshot = acpi_pm_prepare,
    	.finish = acpi_pm_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 (!nvs_nosave)
    			error = suspend_nvs_alloc();
    		if (!error)
    			acpi_target_sleep_state = ACPI_STATE_S4;
    	}
    	return error;
    }
    
    /*
     * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
     * been requested.
     */
    static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
    	.begin = acpi_hibernation_begin_old,
    	.end = acpi_pm_end,
    	.pre_snapshot = acpi_pm_pre_suspend,
    	.prepare = acpi_pm_freeze,
    	.finish = acpi_pm_finish,
    	.enter = acpi_hibernation_enter,
    	.leave = acpi_hibernation_leave,
    	.pre_restore = acpi_pm_freeze,
    	.restore_cleanup = acpi_pm_thaw,
    	.recover = acpi_pm_finish,
    };
    
    static void acpi_sleep_hibernate_setup(void)
    {
    	if (!acpi_sleep_state_supported(ACPI_STATE_S4))
    		return;
    
    	hibernation_set_ops(old_suspend_ordering ?
    			&acpi_hibernation_ops_old : &acpi_hibernation_ops);
    	sleep_states[ACPI_STATE_S4] = 1;
    	if (nosigcheck)
    		return;
    
    	acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
    	if (facs)
    		s4_hardware_signature = facs->hardware_signature;
    }
    #else /* !CONFIG_HIBERNATION */
    static inline void acpi_sleep_hibernate_setup(void) {}
    #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;
    }
    
    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_enter_sleep_state(ACPI_STATE_S5);
    }
    
    int __init acpi_sleep_init(void)
    {
    	char supported[ACPI_S_STATE_COUNT * 3 + 1];
    	char *pos = supported;
    	int i;
    
    	if (acpi_disabled)
    		return 0;
    
    	acpi_sleep_dmi_check();
    
    	sleep_states[ACPI_STATE_S0] = 1;
    
    	acpi_sleep_suspend_setup();
    	acpi_sleep_hibernate_setup();
    
    	if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
    		sleep_states[ACPI_STATE_S5] = 1;
    		pm_power_off_prepare = acpi_power_off_prepare;
    		pm_power_off = acpi_power_off;
    	}
    
    	supported[0] = 0;
    	for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
    		if (sleep_states[i])
    			pos += sprintf(pos, " S%d", i);
    	}
    	pr_info(PREFIX "(supports%s)\n", supported);
    
    	/*
    	 * 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);
    	return 0;
    }