ACPI / PM: Introduce function for refcounting device power resources (30d3df41) · Commits · 戴 / test

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>

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;

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