ACPI: rename main.c to sleep.c
authorLen Brown <len.brown@intel.com>
Fri, 16 Jan 2009 18:52:03 +0000 (13:52 -0500)
committerLen Brown <len.brown@intel.com>
Fri, 16 Jan 2009 19:32:19 +0000 (14:32 -0500)
Signed-off-by: Len Brown <len.brown@intel.com>
drivers/acpi/Makefile
drivers/acpi/main.c [deleted file]
drivers/acpi/sleep.c [new file with mode: 0644]

index d80f4cc2e0da31c9e3679320f473122c447b4aa2..65d90c720b5a63995179235af6683577e112cc44 100644 (file)
@@ -19,7 +19,7 @@ obj-y                         += osl.o utils.o reboot.o\
 
 # sleep related files
 obj-y                          += wakeup.o
-obj-y                          += main.o
+obj-y                          += sleep.o
 obj-$(CONFIG_ACPI_SLEEP)       += proc.o
 
 
diff --git a/drivers/acpi/main.c b/drivers/acpi/main.c
deleted file mode 100644 (file)
index 7e3c609..0000000
+++ /dev/null
@@ -1,747 +0,0 @@
-/*
- * 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 <asm/io.h>
-
-#include <acpi/acpi_bus.h>
-#include <acpi/acpi_drivers.h>
-#include "sleep.h"
-
-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_physical_address)acpi_wakeup_address);
-
-       }
-       ACPI_FLUSH_CPU_CACHE();
-       acpi_enable_wakeup_device_prep(acpi_state);
-#endif
-       printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
-               acpi_state);
-       acpi_enter_sleep_state_prep(acpi_state);
-       return 0;
-}
-
-#ifdef CONFIG_ACPI_SLEEP
-static u32 acpi_target_sleep_state = ACPI_STATE_S0;
-/*
- * 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;
-}
-
-/*
- * According to the ACPI specification the BIOS should make sure that ACPI is
- * enabled and SCI_EN bit is set on wake-up from S1 - S3 sleep states.  Still,
- * some BIOSes don't do that and therefore we use acpi_enable() to enable ACPI
- * on such systems during resume.  Unfortunately that doesn't help in
- * particularly pathological cases in which SCI_EN has to be set directly on
- * resume, although the specification states very clearly that this flag is
- * owned by the hardware.  The set_sci_en_on_resume variable will be set in such
- * cases.
- */
-static bool set_sci_en_on_resume;
-/*
- * 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;
-}
-
-/**
- *     acpi_pm_disable_gpes - Disable the GPEs.
- */
-static int acpi_pm_disable_gpes(void)
-{
-       acpi_disable_all_gpes();
-       return 0;
-}
-
-/**
- *     __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)
-               acpi_disable_all_gpes();
-       return error;
-}
-
-/**
- *     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)
-{
-       u32 acpi_state = acpi_target_sleep_state;
-
-       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_device(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_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
-#endif /* CONFIG_ACPI_SLEEP */
-
-#ifdef CONFIG_SUSPEND
-extern void do_suspend_lowlevel(void);
-
-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;
-
-       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;
-       unsigned long flags = 0;
-       u32 acpi_state = acpi_target_sleep_state;
-
-       ACPI_FLUSH_CPU_CACHE();
-
-       /* Do arch specific saving of state. */
-       if (acpi_state == ACPI_STATE_S3) {
-               int error = acpi_save_state_mem();
-
-               if (error)
-                       return error;
-       }
-
-       local_irq_save(flags);
-       acpi_enable_wakeup_device(acpi_state);
-       switch (acpi_state) {
-       case ACPI_STATE_S1:
-               barrier();
-               status = acpi_enter_sleep_state(acpi_state);
-               break;
-
-       case ACPI_STATE_S3:
-               do_suspend_lowlevel();
-               break;
-       }
-
-       /* If ACPI is not enabled by the BIOS, we need to enable it here. */
-       if (set_sci_en_on_resume)
-               acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1);
-       else
-               acpi_enable();
-
-       /* Reprogram control registers and execute _BFS */
-       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 ]
-        */
-       if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
-               acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
-
-       /*
-        * 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();
-
-       local_irq_restore(flags);
-       printk(KERN_DEBUG "Back to C!\n");
-
-       /* restore processor state */
-       if (acpi_state == ACPI_STATE_S3)
-               acpi_restore_state_mem();
-
-       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 struct platform_suspend_ops acpi_suspend_ops = {
-       .valid = acpi_suspend_state_valid,
-       .begin = acpi_suspend_begin,
-       .prepare = acpi_pm_prepare,
-       .enter = acpi_suspend_enter,
-       .finish = 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 struct platform_suspend_ops acpi_suspend_ops_old = {
-       .valid = acpi_suspend_state_valid,
-       .begin = acpi_suspend_begin_old,
-       .prepare = acpi_pm_disable_gpes,
-       .enter = acpi_suspend_enter,
-       .finish = acpi_pm_finish,
-       .end = acpi_pm_end,
-       .recover = acpi_pm_finish,
-};
-
-static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
-{
-       old_suspend_ordering = true;
-       return 0;
-}
-
-static int __init init_set_sci_en_on_resume(const struct dmi_system_id *d)
-{
-       set_sci_en_on_resume = true;
-       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_set_sci_en_on_resume,
-       .ident = "Apple MacBook 1,1",
-       .matches = {
-               DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
-               DMI_MATCH(DMI_PRODUCT_NAME, "MacBook1,1"),
-               },
-       },
-       {
-       .callback = init_set_sci_en_on_resume,
-       .ident = "Apple MacMini 1,1",
-       .matches = {
-               DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
-               DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
-               },
-       },
-       {},
-};
-#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 = 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_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();
-}
-
-static void acpi_pm_enable_gpes(void)
-{
-       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_disable_gpes,
-       .restore_cleanup = acpi_pm_enable_gpes,
-};
-
-/**
- *     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)
-{
-       int error = acpi_pm_disable_gpes();
-
-       if (!error)
-               hibernate_nvs_save();
-
-       return error;
-}
-
-/*
- * 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_disable_gpes,
-       .enter = acpi_hibernation_enter,
-       .leave = acpi_hibernation_leave,
-       .pre_restore = acpi_pm_disable_gpes,
-       .restore_cleanup = acpi_pm_enable_gpes,
-       .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;
-
-       if (!device_may_wakeup(dev))
-               return -EINVAL;
-
-       handle = DEVICE_ACPI_HANDLE(dev);
-       if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
-               printk(KERN_DEBUG "ACPI handle has no context!\n");
-               return -ENODEV;
-       }
-
-       return enable ?
-               acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
-               acpi_disable_wakeup_device_power(adev);
-}
-#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("%s called\n", __func__);
-       local_irq_disable();
-       acpi_enable_wakeup_device(ACPI_STATE_S5);
-       acpi_enter_sleep_state(ACPI_STATE_S5);
-}
-
-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);
-       return 0;
-}
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
new file mode 100644 (file)
index 0000000..7e3c609
--- /dev/null
@@ -0,0 +1,747 @@
+/*
+ * 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 <asm/io.h>
+
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+#include "sleep.h"
+
+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_physical_address)acpi_wakeup_address);
+
+       }
+       ACPI_FLUSH_CPU_CACHE();
+       acpi_enable_wakeup_device_prep(acpi_state);
+#endif
+       printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
+               acpi_state);
+       acpi_enter_sleep_state_prep(acpi_state);
+       return 0;
+}
+
+#ifdef CONFIG_ACPI_SLEEP
+static u32 acpi_target_sleep_state = ACPI_STATE_S0;
+/*
+ * 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;
+}
+
+/*
+ * According to the ACPI specification the BIOS should make sure that ACPI is
+ * enabled and SCI_EN bit is set on wake-up from S1 - S3 sleep states.  Still,
+ * some BIOSes don't do that and therefore we use acpi_enable() to enable ACPI
+ * on such systems during resume.  Unfortunately that doesn't help in
+ * particularly pathological cases in which SCI_EN has to be set directly on
+ * resume, although the specification states very clearly that this flag is
+ * owned by the hardware.  The set_sci_en_on_resume variable will be set in such
+ * cases.
+ */
+static bool set_sci_en_on_resume;
+/*
+ * 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;
+}
+
+/**
+ *     acpi_pm_disable_gpes - Disable the GPEs.
+ */
+static int acpi_pm_disable_gpes(void)
+{
+       acpi_disable_all_gpes();
+       return 0;
+}
+
+/**
+ *     __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)
+               acpi_disable_all_gpes();
+       return error;
+}
+
+/**
+ *     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)
+{
+       u32 acpi_state = acpi_target_sleep_state;
+
+       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_device(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_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
+#endif /* CONFIG_ACPI_SLEEP */
+
+#ifdef CONFIG_SUSPEND
+extern void do_suspend_lowlevel(void);
+
+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;
+
+       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;
+       unsigned long flags = 0;
+       u32 acpi_state = acpi_target_sleep_state;
+
+       ACPI_FLUSH_CPU_CACHE();
+
+       /* Do arch specific saving of state. */
+       if (acpi_state == ACPI_STATE_S3) {
+               int error = acpi_save_state_mem();
+
+               if (error)
+                       return error;
+       }
+
+       local_irq_save(flags);
+       acpi_enable_wakeup_device(acpi_state);
+       switch (acpi_state) {
+       case ACPI_STATE_S1:
+               barrier();
+               status = acpi_enter_sleep_state(acpi_state);
+               break;
+
+       case ACPI_STATE_S3:
+               do_suspend_lowlevel();
+               break;
+       }
+
+       /* If ACPI is not enabled by the BIOS, we need to enable it here. */
+       if (set_sci_en_on_resume)
+               acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1);
+       else
+               acpi_enable();
+
+       /* Reprogram control registers and execute _BFS */
+       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 ]
+        */
+       if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
+               acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
+
+       /*
+        * 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();
+
+       local_irq_restore(flags);
+       printk(KERN_DEBUG "Back to C!\n");
+
+       /* restore processor state */
+       if (acpi_state == ACPI_STATE_S3)
+               acpi_restore_state_mem();
+
+       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 struct platform_suspend_ops acpi_suspend_ops = {
+       .valid = acpi_suspend_state_valid,
+       .begin = acpi_suspend_begin,
+       .prepare = acpi_pm_prepare,
+       .enter = acpi_suspend_enter,
+       .finish = 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 struct platform_suspend_ops acpi_suspend_ops_old = {
+       .valid = acpi_suspend_state_valid,
+       .begin = acpi_suspend_begin_old,
+       .prepare = acpi_pm_disable_gpes,
+       .enter = acpi_suspend_enter,
+       .finish = acpi_pm_finish,
+       .end = acpi_pm_end,
+       .recover = acpi_pm_finish,
+};
+
+static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
+{
+       old_suspend_ordering = true;
+       return 0;
+}
+
+static int __init init_set_sci_en_on_resume(const struct dmi_system_id *d)
+{
+       set_sci_en_on_resume = true;
+       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_set_sci_en_on_resume,
+       .ident = "Apple MacBook 1,1",
+       .matches = {
+               DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
+               DMI_MATCH(DMI_PRODUCT_NAME, "MacBook1,1"),
+               },
+       },
+       {
+       .callback = init_set_sci_en_on_resume,
+       .ident = "Apple MacMini 1,1",
+       .matches = {
+               DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
+               DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
+               },
+       },
+       {},
+};
+#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 = 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_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();
+}
+
+static void acpi_pm_enable_gpes(void)
+{
+       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_disable_gpes,
+       .restore_cleanup = acpi_pm_enable_gpes,
+};
+
+/**
+ *     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)
+{
+       int error = acpi_pm_disable_gpes();
+
+       if (!error)
+               hibernate_nvs_save();
+
+       return error;
+}
+
+/*
+ * 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_disable_gpes,
+       .enter = acpi_hibernation_enter,
+       .leave = acpi_hibernation_leave,
+       .pre_restore = acpi_pm_disable_gpes,
+       .restore_cleanup = acpi_pm_enable_gpes,
+       .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;
+
+       if (!device_may_wakeup(dev))
+               return -EINVAL;
+
+       handle = DEVICE_ACPI_HANDLE(dev);
+       if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
+               printk(KERN_DEBUG "ACPI handle has no context!\n");
+               return -ENODEV;
+       }
+
+       return enable ?
+               acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
+               acpi_disable_wakeup_device_power(adev);
+}
+#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("%s called\n", __func__);
+       local_irq_disable();
+       acpi_enable_wakeup_device(ACPI_STATE_S5);
+       acpi_enter_sleep_state(ACPI_STATE_S5);
+}
+
+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);
+       return 0;
+}