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Commit 30d3df41 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki Committed by Len Brown
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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: default avatarRafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent d2ef555b

drivers/acpi/internal.h

+1 −0
Original line number Diff line number Diff line
@@ -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;

drivers/acpi/power.c

+8 −0
Original line number Diff line number Diff line
@@ -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;