ACPI / PNP: do ACPI binding directly

PNPACPI uses acpi_bus_type to do ACPI binding for the PNPACPI devices.

This is overkill because PNPACPI code already knows which ACPI
device object to bind during PNPACPI device enumeration.

This patch removes acpi_pnp_bus and does the binding by invoking
acpi_bind_one() directly after device enumerated.

This also fixes a bug in the previous code that some PNPACPI devices failed
to be bound because
 1. the ACPI device _HID is not pnpid, e.g. "MSFT0001", but its _CID is,
    e.g. "PNP0303", thus ACPI _CID is used as the pnp device device id.
 2. device is bound only if the pnp device id matches the ACPI device _HID.
Tested-by: Prigent Christophe <christophe.prigent@intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/internal.h

@@ -84,8 +84,6 @@ void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
 			     int type, unsigned long long sta);
 void acpi_device_add_finalize(struct acpi_device *device);
 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp);
-int acpi_bind_one(struct device *dev, struct acpi_device *adev);
-int acpi_unbind_one(struct device *dev);
 bool acpi_device_is_present(struct acpi_device *adev);
 bool acpi_device_is_battery(struct acpi_device *adev);
 

drivers/pnp/pnpacpi/core.c

@@ -295,9 +295,11 @@ static int __init pnpacpi_add_device(struct acpi_device *device)
 		return error;
 	}
 
+	error = acpi_bind_one(&dev->dev, device);
+
 	num++;
 
-	return 0;
+	return error;
 }
 
 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
@@ -313,41 +315,6 @@ 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->physical_node_count
-	    && compare_pnp_id(pnp->id, acpi_device_hid(acpi));
-}
-
-static struct acpi_device * __init acpi_pnp_find_companion(struct device *dev)
-{
-	dev = bus_find_device(&acpi_bus_type, NULL, to_pnp_dev(dev),
-			      acpi_pnp_match);
-	if (!dev)
-		return NULL;
-
-	put_device(dev);
-	return to_acpi_device(dev);
-}
-
-/* complete initialization of a PNPACPI device includes having
- * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
- */
-static bool acpi_pnp_bus_match(struct device *dev)
-{
-	return dev->bus == &pnp_bus_type;
-}
-
-static struct acpi_bus_type __initdata acpi_pnp_bus = {
-	.name	     = "PNP",
-	.match	     = acpi_pnp_bus_match,
-	.find_companion = acpi_pnp_find_companion,
-};
-
 int pnpacpi_disabled __initdata;
 static int __init pnpacpi_init(void)
 {
@@ -357,10 +324,8 @@ static int __init pnpacpi_init(void)
 	}
 	printk(KERN_INFO "pnp: PnP ACPI init\n");
 	pnp_register_protocol(&pnpacpi_protocol);
-	register_acpi_bus_type(&acpi_pnp_bus);
 	acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 	printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
-	unregister_acpi_bus_type(&acpi_pnp_bus);
 	pnp_platform_devices = 1;
 	return 0;
 }

include/acpi/acpi_bus.h

@@ -487,6 +487,8 @@ struct acpi_bus_type {
 };
 int register_acpi_bus_type(struct acpi_bus_type *);
 int unregister_acpi_bus_type(struct acpi_bus_type *);
+int acpi_bind_one(struct device *dev, struct acpi_device *adev);
+int acpi_unbind_one(struct device *dev);
 
 struct acpi_pci_root {
 	struct acpi_device * device;