commit 420a0f66378c84b00b0e603e4d38210102dbe367
Author: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date:   Sat Sep 18 10:11:09 2010 -0700

    PNPACPI: cope with invalid device IDs
    
    If primary ID (HID) is invalid try locating first valid ID on compatible
    ID list before giving up.
    
    This helps, for example, to recognize i8042 AUX port on Sony Vaio VPCZ1
    which uses SNYSYN0003 as HID. Without the patch users are forced to
    boot with i8042.nopnp to make use of their touchpads.
    
    Tested-by: Jan-Hendrik Zab <jan@jhz.name>
    Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
    Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/pnp/pnpacpi/core.c b/drivers/pnp/pnpacpi/core.c
index dc4e32e..0d943ee 100644
--- a/drivers/pnp/pnpacpi/core.c
+++ b/drivers/pnp/pnpacpi/core.c
@@ -28,7 +28,7 @@
 #include "../base.h"
 #include "pnpacpi.h"
 
-static int num = 0;
+static int num;
 
 /* We need only to blacklist devices that have already an acpi driver that
  * can't use pnp layer. We don't need to blacklist device that are directly
@@ -180,11 +180,24 @@ struct pnp_protocol pnpacpi_protocol = {
 };
 EXPORT_SYMBOL(pnpacpi_protocol);
 
+static char *pnpacpi_get_id(struct acpi_device *device)
+{
+	struct acpi_hardware_id *id;
+
+	list_for_each_entry(id, &device->pnp.ids, list) {
+		if (ispnpidacpi(id->id))
+			return id->id;
+	}
+
+	return NULL;
+}
+
 static int __init pnpacpi_add_device(struct acpi_device *device)
 {
 	acpi_handle temp = NULL;
 	acpi_status status;
 	struct pnp_dev *dev;
+	char *pnpid;
 	struct acpi_hardware_id *id;
 
 	/*
@@ -192,11 +205,17 @@ static int __init pnpacpi_add_device(struct acpi_device *device)
 	 * driver should not be loaded.
 	 */
 	status = acpi_get_handle(device->handle, "_CRS", &temp);
-	if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
-	    is_exclusive_device(device) || (!device->status.present))
+	if (ACPI_FAILURE(status))
+		return 0;
+
+	pnpid = pnpacpi_get_id(device);
+	if (!pnpid)
+		return 0;
+
+	if (is_exclusive_device(device) || !device->status.present)
 		return 0;
 
-	dev = pnp_alloc_dev(&pnpacpi_protocol, num, acpi_device_hid(device));
+	dev = pnp_alloc_dev(&pnpacpi_protocol, num, pnpid);
 	if (!dev)
 		return -ENOMEM;
 
@@ -227,7 +246,7 @@ static int __init pnpacpi_add_device(struct acpi_device *device)
 		pnpacpi_parse_resource_option_data(dev);
 
 	list_for_each_entry(id, &device->pnp.ids, list) {
-		if (!strcmp(id->id, acpi_device_hid(device)))
+		if (!strcmp(id->id, pnpid))
 			continue;
 		if (!ispnpidacpi(id->id))
 			continue;