ACPI / platform: Use struct acpi_scan_handler for creating devices

Currently, the ACPI namespace scanning code creates platform device
objects for ACPI device nodes whose IDs match the contents of the
acpi_platform_device_ids[] table.  However, this adds a superfluous
special case into acpi_bus_device_attach() and makes it more
difficult to follow than it has to be.  It also will make it more
difficult to implement removal code for those platform device objects
in the future.

For the above reasons, introduce a struct acpi_scan_handler object
for creating platform devices and move the code related to that from
acpi_bus_device_attach() to the .attach() callback of that object.
Also move the acpi_platform_device_ids[] table to acpi_platform.c.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Acked-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Acked-by: Toshi Kani <toshi.kani@hp.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>

1 files changed, 48 insertions, 11 deletions

diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c
index 2d1fb4c21605..26fce4b8a632 100644
--- a/drivers/acpi/acpi_platform.c
+++ b/drivers/acpi/acpi_platform.c
@@ -22,6 +22,30 @@
 
 ACPI_MODULE_NAME("platform");
 
+/* Flags for acpi_create_platform_device */
+#define ACPI_PLATFORM_CLK       BIT(0)
+
+/*
+ * The following ACPI IDs are known to be suitable for representing as
+ * platform devices.
+ */
+static const struct acpi_device_id acpi_platform_device_ids[] = {
+
+        { "PNP0D40" },
+
+        /* Haswell LPSS devices */
+        { "INT33C0", ACPI_PLATFORM_CLK },
+        { "INT33C1", ACPI_PLATFORM_CLK },
+        { "INT33C2", ACPI_PLATFORM_CLK },
+        { "INT33C3", ACPI_PLATFORM_CLK },
+        { "INT33C4", ACPI_PLATFORM_CLK },
+        { "INT33C5", ACPI_PLATFORM_CLK },
+        { "INT33C6", ACPI_PLATFORM_CLK },
+        { "INT33C7", ACPI_PLATFORM_CLK },
+
+        { }
+};
+
 static int acpi_create_platform_clks(struct acpi_device *adev)
 {
         static struct platform_device *pdev;
@@ -39,8 +63,7 @@ static int acpi_create_platform_clks(struct acpi_device *adev)
 /**
  * acpi_create_platform_device - Create platform device for ACPI device node
  * @adev: ACPI device node to create a platform device for.
- * @flags: ACPI_PLATFORM_* flags that affect the creation of the platform
- *         devices.
+ * @id: ACPI device ID used to match @adev.
  *
  * Check if the given @adev can be represented as a platform device and, if
  * that's the case, create and register a platform device, populate its common
@@ -48,9 +71,10 @@ static int acpi_create_platform_clks(struct acpi_device *adev)
  *
  * Name of the platform device will be the same as @adev's.
  */
-struct platform_device *acpi_create_platform_device(struct acpi_device *adev,
-                                                    unsigned long flags)
+static int acpi_create_platform_device(struct acpi_device *adev,
+                                       const struct acpi_device_id *id)
 {
+        unsigned long flags = id->driver_data;
         struct platform_device *pdev = NULL;
         struct acpi_device *acpi_parent;
         struct platform_device_info pdevinfo;
@@ -59,25 +83,28 @@ struct platform_device *acpi_create_platform_device(struct acpi_device *adev,
         struct resource *resources;
         int count;
 
-        if ((flags & ACPI_PLATFORM_CLK) && acpi_create_platform_clks(adev)) {
-                dev_err(&adev->dev, "failed to create clocks\n");
-                return NULL;
+        if (flags & ACPI_PLATFORM_CLK) {
+                int ret = acpi_create_platform_clks(adev);
+                if (ret) {
+                        dev_err(&adev->dev, "failed to create clocks\n");
+                        return ret;
+                }
         }
 
         /* If the ACPI node already has a physical device attached, skip it. */
         if (adev->physical_node_count)
-                return NULL;
+                return 0;
 
         INIT_LIST_HEAD(&resource_list);
         count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
         if (count <= 0)
-                return NULL;
+                return 0;
 
         resources = kmalloc(count * sizeof(struct resource), GFP_KERNEL);
         if (!resources) {
                 dev_err(&adev->dev, "No memory for resources\n");
                 acpi_dev_free_resource_list(&resource_list);
-                return NULL;
+                return -ENOMEM;
         }
         count = 0;
         list_for_each_entry(rentry, &resource_list, node)
@@ -123,5 +150,15 @@ struct platform_device *acpi_create_platform_device(struct acpi_device *adev,
         }
 
         kfree(resources);
-        return pdev;
+        return 1;
+}
+
+static struct acpi_scan_handler platform_handler = {
+        .ids = acpi_platform_device_ids,
+        .attach = acpi_create_platform_device,
+};
+
+void __init acpi_platform_init(void)
+{
+        acpi_scan_add_handler(&platform_handler);
 }