/*
* 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 <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include "sleep.h"
u8 sleep_states[ACPI_S_STATE_COUNT];
static struct pm_ops acpi_pm_ops;
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
};
static int init_8259A_after_S1;
/**
* acpi_pm_prepare - Do preliminary suspend work.
* @pm_state: suspend state we're entering.
*
* Make sure we support the state. If we do, and we need it, set the
* firmware waking vector and do arch-specific nastiness to get the
* wakeup code to the waking vector.
*/
extern int acpi_sleep_prepare(u32 acpi_state);
extern void acpi_power_off(void);
static int acpi_pm_prepare(suspend_state_t pm_state)
{
u32 acpi_state = acpi_suspend_states[pm_state];
if (!sleep_states[acpi_state]) {
printk("acpi_pm_prepare does not support %d \n", pm_state);
return -EPERM;
}
return acpi_sleep_prepare(acpi_state);
}
/**
* acpi_pm_enter - Actually enter a sleep state.
* @pm_state: State we're entering.
*
* Flush caches and go to sleep. For STR or STD, 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_pm_enter(suspend_state_t pm_state)
{
acpi_status status = AE_OK;
unsigned long flags = 0;
u32 acpi_state = acpi_suspend_states[pm_state];
ACPI_FLUSH_CPU_CACHE();
/* Do arch specific saving of state. */
if (pm_state > PM_SUSPEND_STANDBY) {
int error = acpi_save_state_mem();
if (error)
return error;
}
local_irq_save(flags);
acpi_enable_wakeup_device(acpi_state);
switch (pm_state) {
case PM_SUSPEND_STANDBY:
barrier();
status = acpi_enter_sleep_state(acpi_state);
break;
case PM_SUSPEND_MEM:
do_suspend_lowlevel();
break;
default:
return -EINVAL;
}
/* ACPI 3.0 specs (P62) says that it's the responsabilty
* 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);
local_irq_restore(flags);
printk(KERN_DEBUG "Back to C!\n");
/* restore processor state
* We should only be here if we're coming back from STR or STD.
* And, in the case of the latter, the memory image should have already
* been loaded from disk.
*/
if (pm_state > PM_SUSPEND_STANDBY)
acpi_restore_state_mem();
return ACPI_SUCCESS(status) ? 0 : -EFAULT;
}
/**
* acpi_pm_finish - Finish up suspend sequence.
* @pm_state: State we're coming out of.
*
* This is called after we wake back up (or if entering the sleep state
* failed).
*/
static int acpi_pm_finish(suspend_state_t pm_state)
{
u32 acpi_state = acpi_suspend_states[pm_state];
acpi_leave_sleep_state(acpi_state);
acpi_disable_wakeup_device(acpi_state);
/* reset firmware waking vector */
acpi_set_firmware_waking_vector((acpi_physical_address) 0);
if (init_8259A_after_S1) {
printk("Broken toshiba laptop -> kicking interrupts\n");
init_8259A(0);
}
return 0;
}
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 int acpi_pm_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 pm_ops acpi_pm_ops = {
.valid = acpi_pm_state_valid,
.prepare = acpi_pm_prepare,
.enter = acpi_pm_enter,
.finish = acpi_pm_finish,
};
#ifdef CONFIG_SOFTWARE_SUSPEND
static int acpi_hibernation_prepare(void)
{
return acpi_sleep_prepare(ACPI_STATE_S4);
}
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);
local_irq_restore(flags);
return ACPI_SUCCESS(status) ? 0 : -EFAULT;
}
static void acpi_hibernation_finish(void)
{
acpi_leave_sleep_state(ACPI_STATE_S4);
acpi_disable_wakeup_device(ACPI_STATE_S4);
/* reset firmware waking vector */
acpi_set_firmware_waking_vector((acpi_physical_address) 0);
if (init_8259A_after_S1) {
printk("Broken toshiba laptop -> kicking interrupts\n");
init_8259A(0);
}
}
static struct hibernation_ops acpi_hibernation_ops = {
.prepare = acpi_hibernation_prepare,
.enter = acpi_hibernation_enter,
.finish = acpi_hibernation_finish,
};
#endif /* CONFIG_SOFTWARE_SUSPEND */
/*
* Toshiba fails to preserve interrupts over S1, reinitialization
* of 8259 is needed after S1 resume.
*/
static int __init init_ints_after_s1(struct dmi_system_id *d)
{
printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident);
init_8259A_after_S1 = 1;
return 0;
}
static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
{
.callback = init_ints_after_s1,
.ident = "Toshiba Satellite 4030cdt",
.matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),},
},
{},
};
int __init acpi_sleep_init(void)
{
int i = 0;
dmi_check_system(acpisleep_dmi_table);
if (acpi_disabled)
return 0;
printk(KERN_INFO PREFIX "(supports");
for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
acpi_status status;
u8 type_a, type_b;
status = acpi_get_sleep_type_data(i, &type_a, &type_b);
if (ACPI_SUCCESS(status)) {
sleep_states[i] = 1;
printk(" S%d", i);
}
}
printk(")\n");
pm_set_ops(&acpi_pm_ops);
#ifdef CONFIG_SOFTWARE_SUSPEND
if (sleep_states[ACPI_STATE_S4])
hibernation_set_ops(&acpi_hibernation_ops);
#else
sleep_states[ACPI_STATE_S4] = 0;
#endif
return 0;
}
