diff --git a/example.py b/example.py
index ab1b0fd..0664a49 100644
--- a/example.py
+++ b/example.py
@@ -7,7 +7,9 @@
 pci_vendor_id = '1002'
 pci_device_id = '687f'
 pci_subsystem_id = '1043:04c4'
-
+pci_class = "0c"
+pci_subclass = "07"
+pci_prog_if = "02"
 usb_vendor_id = '03f0'
 usb_device_id = '1f12'
 
@@ -16,6 +18,9 @@
 print("Vendor: %s" % pci.get_vendor(pci_vendor_id))
 print("Device: %s" % pci.get_device(pci_vendor_id, pci_device_id))
 print("Subsystem: %s" % pci.get_subsystem(pci_vendor_id, pci_device_id, pci_subsystem_id))
+print("Class: %s" % pci.get_class(pci_class))
+print("subclass: %s" % pci.get_subclass(pci_class, pci_subclass))
+print("prog_if: %s" % pci.get_prog_if(pci_class, pci_subclass, pci_prog_if))
 
 
 usb = USB()
diff --git a/hwdata.py b/hwdata.py
index b7120ea..eebfb3b 100644
--- a/hwdata.py
+++ b/hwdata.py
@@ -19,7 +19,7 @@
 # pylint: disable=misplaced-bare-raise
 
 class USB:
-    """ Interace to usb.ids from hwdata package """
+    """ Interface to usb.ids from hwdata package """
     filename = '/usr/share/hwdata/usb.ids'
     devices = None
 
@@ -103,9 +103,10 @@ def get_device(self, vendor, device):
             raise NotImplementedError()
 
 class PCI:
-    """ Interace to pci.ids from hwdata package """
+    """ Interface to pci.ids from hwdata package """
     filename = '/usr/share/hwdata/pci.ids'
     devices = None
+    devices_class = None
 
     def __init__(self, filename=None):
         """ Load pci.ids from file to internal data structure.
@@ -117,14 +118,23 @@ def __init__(self, filename=None):
             self.filename = PCI.filename
         self.cache = 1
 
-        if self.cache and not PCI.devices:
+        if self.cache and not PCI.devices and not PCI.devices_class:
             # parse pci.ids
             PCI.devices = {}
+            PCI.devices_class = {}
+
             f = open(self.filename, encoding='ISO8859-1')
             vendor = None
             device = None
-            for line in f.readlines():
+            while True:
+                line = f.readline()
+                if not line:
+                   break
                 l = line.split()
+
+                # Break to exit the loop and parse device classes
+                if line.startswith('# C class'):
+                    break
                 if line.startswith('#'):
                     continue
                 elif len(l) == 0:
@@ -145,6 +155,36 @@ def __init__(self, filename=None):
                     else: # this should not happen
                         PCI.devices[vendor][0] = vendor_name
 
+            device_class = None
+            subclass = None
+            while True:
+                line = f.readline()
+                if not line:
+                   break
+                l = line.split()
+
+                if line.startswith('#'):
+                    continue
+                elif len(l) == 0:
+                    continue
+                elif line.startswith('\t\t'):
+                    prog_if = l[0].lower()
+                    prog_if_name = ' '.join(l[1:])
+                    PCI.devices_class[device_class][1][subclass][1][prog_if] = prog_if_name
+                elif line.startswith('\t'):
+                    subclass = l[0].lower()
+                    subclass_name = ' '.join(l[1:])
+                    PCI.devices_class[device_class][1][subclass] = [subclass_name, {}]
+                else:
+                    device_class = l[1].lower()
+                    device_class_name = ' '.join(l[2:])
+                    if not device_class in list(PCI.devices_class.keys()):
+                        PCI.devices_class[device_class] = [device_class_name, {}]
+                    else:
+                        PCI.devices_class[device_class][0] = device_class_name
+            f.close()
+
+
     def get_vendor(self, vendor):
         """ Return description of vendor. Parameter is two byte code in hexa.
             If vendor is unknown None is returned.
@@ -198,8 +238,62 @@ def get_subsystem(self, vendor, device, subsystem):
         else:
             raise NotImplementedError()
 
+    def get_class(self, device_class):
+        """ Return device_class name of pci_class.
+            'device_class' is a bytes code variables in hexa of pci_class.
+            If subclass is unknown None is returned.
+        """
+        device_class = device_class.lower()
+        if self.cache:
+            if device_class in list(PCI.devices_class.keys()):
+                return PCI.devices_class[device_class][0]
+            else:
+                return None
+        else:
+            raise NotImplementedError()
+
+    def get_subclass(self, device_class, subclass):
+        """ Return subclass name of pci_class.
+            'device_class' and 'subclass' are two bytes code variables in hexa of pci_class.
+            If subclass is unknown None is returned.
+        """
+        device_class = device_class.lower()
+        subclass = subclass.lower()
+        if self.cache:
+            if device_class in list(PCI.devices_class.keys()):
+                if subclass in list(PCI.devices_class[device_class][1].keys()):
+                    return PCI.devices_class[device_class][1][subclass][0]
+                else:
+                    return None
+            else:
+                return None
+        else:
+            raise NotImplementedError()
+
+    def get_prog_if(self, device_class, subclass, prog_if):
+        """ Return prog_if name of pci_class.
+            'device_class', 'subclass' and prog_if are three byte code variables in hexa of pci_class.
+            If prog_if is unknown None is returned.
+        """
+        device_class = device_class.lower()
+        subclass = subclass.lower()
+        prog_if = prog_if.lower()
+        if self.cache:
+            if device_class in list(PCI.devices_class.keys()):
+                if subclass in list(PCI.devices_class[device_class][1].keys()):
+                    if prog_if in list(PCI.devices_class[device_class][1][subclass][1].keys()):
+                        return PCI.devices_class[device_class][1][subclass][1][prog_if]
+                    else:
+                        return None
+                else:
+                    return None
+            else:
+                return None
+        else:
+            raise NotImplementedError()
+
 class PNP:
-    """ Interace to pnp.ids from hwdata package """
+    """ Interface to pnp.ids from hwdata package """
     filename = '/usr/share/hwdata/pnp.ids'
     VENDORS = None