PNPACPI sets pnpdev->dev.archdata

Teach PNPACPI how to hook up its devices to their ACPI nodes, so that
pnpdev->dev.archdata points to the parallel acpi device node.  Previously
this only worked for PCI, leaving a notable hole.

Export "acpi_bus_type" so this can work.

Remove some extraneous whitespace.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Adam Belay <ambx1@neo.rr.com>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/acpi/scan.c

@@ -302,7 +302,7 @@ static void acpi_device_shutdown(struct device *dev)
 	return ;
 }
 
-static struct bus_type acpi_bus_type = {
+struct bus_type acpi_bus_type = {
 	.name		= "acpi",
 	.suspend	= acpi_device_suspend,
 	.resume		= acpi_device_resume,

drivers/pnp/pnpacpi/core.c

@@ -236,6 +236,42 @@ static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 	return AE_OK;
 }
 
+static int __init acpi_pnp_match(struct device *dev, void *_pnp)
+{
+	struct acpi_device	*acpi = to_acpi_device(dev);
+	struct pnp_dev		*pnp = _pnp;
+
+	/* true means it matched */
+	return acpi->flags.hardware_id
+		&& !acpi_get_physical_device(acpi->handle)
+		&& compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
+}
+
+static int __init acpi_pnp_find_device(struct device *dev, acpi_handle *handle)
+{
+	struct device		*adev;
+	struct acpi_device	*acpi;
+
+	adev = bus_find_device(&acpi_bus_type, NULL,
+			to_pnp_dev(dev),
+			acpi_pnp_match);
+	if (!adev)
+		return -ENODEV;
+
+	acpi = to_acpi_device(adev);
+	*handle = acpi->handle;
+	put_device(adev);
+	return 0;
+}
+
+/* complete initialization of a PNPACPI device includes having
+ * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
+ */
+static struct acpi_bus_type __initdata acpi_pnp_bus = {
+	.bus = &pnp_bus_type,
+	.find_device = acpi_pnp_find_device,
+};
+
 int pnpacpi_disabled __initdata;
 static int __init pnpacpi_init(void)
 {
@@ -245,8 +281,10 @@ static int __init pnpacpi_init(void)
 	}
 	pnp_info("PnP ACPI init");
 	pnp_register_protocol(&pnpacpi_protocol);
+	register_acpi_bus_type(&acpi_pnp_bus);
 	acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 	pnp_info("PnP ACPI: found %d devices", num);
+	unregister_acpi_bus_type(&acpi_pnp_bus);
 	return 0;
 }
 subsys_initcall(pnpacpi_init);

include/acpi/acpi_bus.h

@@ -303,6 +303,9 @@ struct acpi_device {
 #define to_acpi_device(d)	container_of(d, struct acpi_device, dev)
 #define to_acpi_driver(d)	container_of(d, struct acpi_driver, drv)
 
+/* acpi_device.dev.bus == &acpi_bus_type */
+extern struct bus_type acpi_bus_type;
+
 /*
  * Events
  * ------