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ACPI / PM: Introduce function for refcounting device power resources 

Introduce function acpi_power_on_resources() that reference counts
and possibly turns on ACPI power resources for a given device and
a given power state of it.

This function will be used for reference counting device power
resources during initialization.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Rafael J. Wysocki 2010-11-25 00:06:55 +01:00 committed by Len Brown
parent d2ef555b57
commit 30d3df41b3
2 changed files with 9 additions and 0 deletions
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1
drivers/acpi/internal.h
View File

@ -42,6 +42,7 @@ int acpi_power_init(void);
int acpi_device_sleep_wake(struct acpi_device *dev,
int enable, int sleep_state, int dev_state);
int acpi_power_get_inferred_state(struct acpi_device *device, int *state);
int acpi_power_on_resources(struct acpi_device *device, int state);
int acpi_power_transition(struct acpi_device *device, int state);
extern int acpi_power_nocheck;

8
drivers/acpi/power.c
View File

@ -485,6 +485,14 @@ int acpi_power_get_inferred_state(struct acpi_device *device, int *state)
return 0;
}
int acpi_power_on_resources(struct acpi_device *device, int state)
{
if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3)
return -EINVAL;
return acpi_power_on_list(&device->power.states[state].resources);
}
int acpi_power_transition(struct acpi_device *device, int state)
{
int result;