static u32 rtc_handler(void *context)
{
struct device *dev = context;
pm_wakeup_event(dev, 0);
acpi_clear_event(ACPI_EVENT_RTC);
acpi_disable_event(ACPI_EVENT_RTC, 0);
return ACPI_INTERRUPT_HANDLED;
}
acpi_status
acpi_install_fixed_event_handler (
u32 event,
acpi_event_handler handler,
void *context)
{
acpi_status status;
ACPI_FUNCTION_TRACE ("acpi_install_fixed_event_handler");
/* Parameter validation */
if (event > ACPI_EVENT_MAX) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
/* Don't allow two handlers. */
if (NULL != acpi_gbl_fixed_event_handlers[event].handler) {
status = AE_ALREADY_EXISTS;
goto cleanup;
}
/* Install the handler before enabling the event */
acpi_gbl_fixed_event_handlers[event].handler = handler;
acpi_gbl_fixed_event_handlers[event].context = context;
status = acpi_clear_event (event);
if (ACPI_SUCCESS(status))
status = acpi_enable_event (event, 0);
if (ACPI_FAILURE (status)) {
ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "Could not enable fixed event.\n"));
/* Remove the handler */
acpi_gbl_fixed_event_handlers[event].handler = NULL;
acpi_gbl_fixed_event_handlers[event].context = NULL;
}
else {
ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
"Enabled fixed event %X, Handler=%p\n", event, handler));
}
cleanup:
(void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
return_ACPI_STATUS (status);
}
static inline void rtc_wake_setup(struct device *dev)
{
acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, dev);
/*
* After the RTC handler is installed, the Fixed_RTC event should
* be disabled. Only when the RTC alarm is set will it be enabled.
*/
acpi_clear_event(ACPI_EVENT_RTC);
acpi_disable_event(ACPI_EVENT_RTC, 0);
}
/**
* 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;
}
/* 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_hw_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;
}
acpi_status
acpi_install_fixed_event_handler(u32 event,
acpi_event_handler handler, void *context)
{
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_install_fixed_event_handler);
if (event > ACPI_EVENT_MAX) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
if (NULL != acpi_gbl_fixed_event_handlers[event].handler) {
status = AE_ALREADY_EXISTS;
goto cleanup;
}
acpi_gbl_fixed_event_handlers[event].handler = handler;
acpi_gbl_fixed_event_handlers[event].context = context;
status = acpi_clear_event(event);
if (ACPI_SUCCESS(status))
status = acpi_enable_event(event, 0);
if (ACPI_FAILURE(status)) {
ACPI_WARNING((AE_INFO, "Could not enable fixed event %X",
event));
acpi_gbl_fixed_event_handlers[event].handler = NULL;
acpi_gbl_fixed_event_handlers[event].context = NULL;
} else {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Enabled fixed event %X, Handler=%p\n", event,
handler));
}
cleanup:
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
return_ACPI_STATUS(status);
}
static u32 rtc_handler(void *context)
{
struct device *dev = context;
struct cmos_rtc *cmos = dev_get_drvdata(dev);
unsigned char rtc_control = 0;
unsigned char rtc_intr;
spin_lock_irq(&rtc_lock);
if (cmos_rtc.suspend_ctrl)
rtc_control = CMOS_READ(RTC_CONTROL);
if (rtc_control & RTC_AIE) {
cmos_rtc.suspend_ctrl &= ~RTC_AIE;
CMOS_WRITE(rtc_control, RTC_CONTROL);
rtc_intr = CMOS_READ(RTC_INTR_FLAGS);
rtc_update_irq(cmos->rtc, 1, rtc_intr);
}
spin_unlock_irq(&rtc_lock);
pm_wakeup_event(dev, 0);
acpi_clear_event(ACPI_EVENT_RTC);
acpi_disable_event(ACPI_EVENT_RTC, 0);
return ACPI_INTERRUPT_HANDLED;
}
static void rtc_wake_on(struct device *dev)
{
acpi_clear_event(ACPI_EVENT_RTC);
acpi_enable_event(ACPI_EVENT_RTC, 0);
}
static u32 rtc_handler(void *context)
{
acpi_clear_event(ACPI_EVENT_RTC);
acpi_disable_event(ACPI_EVENT_RTC, 0);
return ACPI_INTERRUPT_HANDLED;
}
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:
if (unlikely(acpi_simulate_suspend_to_ram)) {
printk(KERN_INFO "ACPI: simulating suspend-to-RAM: "
"not calling BIOS.\n");
} else {
do_suspend_lowlevel();
}
break;
case PM_SUSPEND_DISK:
if (acpi_pm_ops.pm_disk_mode == PM_DISK_PLATFORM)
status = acpi_enter_sleep_state(acpi_state);
break;
case PM_SUSPEND_MAX:
acpi_power_off();
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;
}
static inline void rtc_wake_setup(void)
{
acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL);
acpi_clear_event(ACPI_EVENT_RTC);
acpi_disable_event(ACPI_EVENT_RTC, 0);
}