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>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 95fedbdf4fb8..0cb4eab50d73 100644
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -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;