acpi_fan_get_fst
int acpi_fan_get_fst(acpi_handle handle, struct acpi_fan_fst *fst);
status = acpi_fan_get_fst(acpi_dev->handle, &fst);
status = acpi_fan_get_fst(device->handle, &fst);
ret = acpi_fan_get_fst(handle, &fst);
ret = acpi_fan_get_fst(fan->handle, &fst);