[PATCH 4/4] Define fields in terms of the Class Code register

[oliver.henshaw@gmail.com]

[-- Attachment #1: usb-change-to-class_code --]
[-- Type: text/plain, Size: 2169 bytes --]

Changelog:
	* bus/usb/ohci.c: Define the Class, Subclass and Programming Interface fields in 
			  terms of the 3 byte Class Code register.
	* bus/usb/uhci.c: Likewise.
---
 bus/usb/ohci.c |    9 +++++----
 bus/usb/uhci.c |    9 +++++----
 2 files changed, 10 insertions(+), 8 deletions(-)

Index: grub2/bus/usb/ohci.c
===================================================================
--- grub2.orig/bus/usb/ohci.c
+++ grub2/bus/usb/ohci.c
@@ -116,6 +116,7 @@ static int NESTED_FUNC_ATTR
 grub_ohci_pci_iter (int bus, int device, int func,
 		    grub_pci_id_t pciid __attribute__((unused)))
 {
+  grub_uint32_t class_code;
   grub_uint32_t class;
   grub_uint32_t subclass;
   grub_uint32_t interf;
@@ -126,11 +127,11 @@ grub_ohci_pci_iter (int bus, int device,
   grub_uint32_t frame_interval;
 
   addr = grub_pci_make_address (bus, device, func, 2);
-  class = grub_pci_read (addr);
+  class_code = grub_pci_read (addr) >> 8;
 
-  interf = (class >> 8) & 0xFF;
-  subclass = (class >> 16) & 0xFF;
-  class >>= 24;
+  interf = class_code & 0xFF;
+  subclass = (class_code >> 8) & 0xFF;
+  class = class_code >> 16;
 
   /* If this is not an OHCI controller, just return.  */
   if (class != 0x0c || subclass != 0x03 || interf != 0x10)
Index: grub2/bus/usb/uhci.c
===================================================================
--- grub2.orig/bus/usb/uhci.c
+++ grub2/bus/usb/uhci.c
@@ -141,6 +141,7 @@ static int NESTED_FUNC_ATTR
 grub_uhci_pci_iter (int bus, int device, int func,
 		    grub_pci_id_t pciid __attribute__((unused)))
 {
+  grub_uint32_t class_code;
   grub_uint32_t class;
   grub_uint32_t subclass;
   grub_uint32_t interf;
@@ -151,11 +152,11 @@ grub_uhci_pci_iter (int bus, int device,
   int i;
 
   addr = grub_pci_make_address (bus, device, func, 2);
-  class = grub_pci_read (addr);
+  class_code = grub_pci_read (addr) >> 8;
 
-  interf = (class >> 8) & 0xFF;
-  subclass = (class >> 16) & 0xFF;
-  class >>= 24;
+  interf = class_code & 0xFF;
+  subclass = (class_code >> 8) & 0xFF;
+  class = class_code >> 16;
 
   /* If this is not an UHCI controller, just return.  */
   if (class != 0x0c || subclass != 0x03 || interf != 0x00)