acpi: utils: move acpi_lpss_dep() to utils

I need to be able to identify devices which declare themselves to be
dependent on other devices through _DEP; add this function to utils.c
and export it to the rest of the ACPI layer.

Signed-off-by: Daniel Scally <djrscally@gmail.com>
Patchset: cameras

drivers/acpi/acpi_lpss.c

@@ -543,30 +543,6 @@ static struct device *acpi_lpss_find_device(const char *hid, const char *uid)
  return bus_find_device(&pci_bus_type, NULL, &data, match_hid_uid);
 }
 
-static bool acpi_lpss_dep(struct acpi_device *adev, acpi_handle handle)
-{
- struct acpi_handle_list dep_devices;
- acpi_status status;
- int i;
-
- if (!acpi_has_method(adev->handle, "_DEP"))
- return false;
-
- status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
- &dep_devices);
- if (ACPI_FAILURE(status)) {
- dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
- return false;
- }
-
- for (i = 0; i < dep_devices.count; i++) {
- if (dep_devices.handles[i] == handle)
- return true;
- }
-
- return false;
-}
-
 static void acpi_lpss_link_consumer(struct device *dev1,
  const struct lpss_device_links *link)
 {

drivers/acpi/internal.h

@@ -79,6 +79,7 @@ static inline void acpi_lpss_init(void) {}
 #endif
 
 void acpi_apd_init(void);
+bool acpi_lpss_dep(struct acpi_device *adev, acpi_handle handle);
 
 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src);
 bool acpi_queue_hotplug_work(struct work_struct *work);

drivers/acpi/utils.c

@@ -807,6 +807,30 @@ static int acpi_dev_match_cb(struct device *dev, const void *data)
  return hrv == match->hrv;
 }
 
+bool acpi_lpss_dep(struct acpi_device *adev, acpi_handle handle)
+{
+ struct acpi_handle_list dep_devices;
+ acpi_status status;
+ int i;
+
+ if (!acpi_has_method(adev->handle, "_DEP"))
+ return false;
+
+ status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
+ &dep_devices);
+ if (ACPI_FAILURE(status)) {
+ dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
+ return false;
+ }
+
+ for (i = 0; i < dep_devices.count; i++) {
+ if (dep_devices.handles[i] == handle)
+ return true;
+ }
+
+ return false;
+}
+
 /**
  * acpi_dev_present - Detect that a given ACPI device is present
  * @hid: Hardware ID of the device.