ACPI: Add support for platform bus type

[mirror_ubuntu-zesty-kernel.git] / drivers / acpi / scan.c

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 1fcb8678665c0e89113da39e0f603db2d49eeccb..d842569395a9f310b4e50e23c18db9a2fad4feb7 100644 (file)
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -29,6 +29,15 @@ extern struct acpi_device *acpi_root;
 
 static const char *dummy_hid = "device";
 
+/*
+ * The following ACPI IDs are known to be suitable for representing as
+ * platform devices.
+ */
+static const struct acpi_device_id acpi_platform_device_ids[] = {
+
+       { }
+};
+
 static LIST_HEAD(acpi_device_list);
 static LIST_HEAD(acpi_bus_id_list);
 DEFINE_MUTEX(acpi_device_lock);
@@ -340,8 +349,8 @@ static void acpi_device_remove_files(struct acpi_device *dev)
                        ACPI Bus operations
    -------------------------------------------------------------------------- */
 
-int acpi_match_device_ids(struct acpi_device *device,
-                         const struct acpi_device_id *ids)
+static const struct acpi_device_id *__acpi_match_device(
+       struct acpi_device *device, const struct acpi_device_id *ids)
 {
        const struct acpi_device_id *id;
        struct acpi_hardware_id *hwid;
@@ -351,14 +360,44 @@ int acpi_match_device_ids(struct acpi_device *device,
         * driver for it.
         */
        if (!device->status.present)
-               return -ENODEV;
+               return NULL;
 
        for (id = ids; id->id[0]; id++)
                list_for_each_entry(hwid, &device->pnp.ids, list)
                        if (!strcmp((char *) id->id, hwid->id))
-                               return 0;
+                               return id;
 
-       return -ENOENT;
+       return NULL;
+}
+
+/**
+ * acpi_match_device - Match a struct device against a given list of ACPI IDs
+ * @ids: Array of struct acpi_device_id object to match against.
+ * @dev: The device structure to match.
+ *
+ * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
+ * object for that handle and use that object to match against a given list of
+ * device IDs.
+ *
+ * Return a pointer to the first matching ID on success or %NULL on failure.
+ */
+const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
+                                              const struct device *dev)
+{
+       struct acpi_device *adev;
+
+       if (!ids || !dev->acpi_handle
+           || ACPI_FAILURE(acpi_bus_get_device(dev->acpi_handle, &adev)))
+               return NULL;
+
+       return __acpi_match_device(adev, ids);
+}
+EXPORT_SYMBOL_GPL(acpi_match_device);
+
+int acpi_match_device_ids(struct acpi_device *device,
+                         const struct acpi_device_id *ids)
+{
+       return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 }
 EXPORT_SYMBOL(acpi_match_device_ids);
 
@@ -1483,8 +1522,13 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
         */
        device = NULL;
        acpi_bus_get_device(handle, &device);
-       if (ops->acpi_op_add && !device)
+       if (ops->acpi_op_add && !device) {
                acpi_add_single_object(&device, handle, type, sta, ops);
+               /* Is the device a known good platform device? */
+               if (device
+                   && !acpi_match_device_ids(device, acpi_platform_device_ids))
+                       acpi_create_platform_device(device);
+       }
 
        if (!device)
                return AE_CTRL_DEPTH;