diff --git a/usb/config.go b/usb/config.go
index de3e12b..cdb1b18 100644
--- a/usb/config.go
+++ b/usb/config.go
@@ -5,6 +5,7 @@ package usb
 import "C"
 
 import (
+	"fmt"
 	"log"
 	"reflect"
 	"runtime"
@@ -13,38 +14,64 @@ import (
 
 type Endpoint struct {
 	Type          DescriptorType
-	Address       ID
+	Address       uint8
+	Attributes    uint8
 	MaxPacketSize uint16
 	PollInterval  uint8
 	RefreshRate   uint8
-	SynchAddress  ID
+	SynchAddress  uint8
+}
+
+func (e Endpoint) Number() int {
+	return int(e.Address) & ENDPOINT_NUM_MASK
+}
+
+func (e Endpoint) Direction() EndpointDirection {
+	return EndpointDirection(e.Address) & ENDPOINT_DIR_MASK
+}
+
+func (e Endpoint) String() string {
+	return fmt.Sprintf("Endpoint %d %-3s %s - %s %s",
+		e.Number(), e.Direction(),
+		TransferType(e.Attributes) & TRANSFER_TYPE_MASK,
+		IsoSyncType(e.Attributes) & ISO_SYNC_TYPE_MASK,
+		IsoUsageType(e.Attributes) & ISO_USAGE_TYPE_MASK,
+	)
 }
 
 type Interface struct {
 	Type       DescriptorType
-	Number     ID
-	Alternate  ID
-	IfClass    Class
+	Number     uint8
+	Alternate  uint8
+	IfClass    uint8
 	IfSubClass uint8
 	IfProtocol uint8
 	Endpoints  []*Endpoint
 }
 
+func (i Interface) String() string {
+	return fmt.Sprintf("Interface %02x (config %02x)", i.Number, i.Alternate)
+}
+
 type Config struct {
 	cfg *C.struct_libusb_config_descriptor
 
 	Type       DescriptorType
-	Config     ID
+	Config     uint8
 	Attributes uint8
 	MaxPower   uint8
 	Interfaces [][]*Interface
 }
 
+func (c Config) String() string {
+	return fmt.Sprintf("Config %02x", c.Config)
+}
+
 func newConfig(cfg *C.struct_libusb_config_descriptor) *Config {
 	c := &Config{
 		cfg:        cfg,
 		Type:       DescriptorType(cfg.bDescriptorType),
-		Config:     ID(cfg.bConfigurationValue),
+		Config:     uint8(cfg.bConfigurationValue),
 		Attributes: uint8(cfg.bmAttributes),
 		MaxPower:   uint8(cfg.MaxPower),
 	}
@@ -67,9 +94,9 @@ func newConfig(cfg *C.struct_libusb_config_descriptor) *Config {
 		for _, alt := range alts {
 			i := &Interface{
 				Type:       DescriptorType(alt.bDescriptorType),
-				Number:     ID(alt.bInterfaceNumber),
-				Alternate:  ID(alt.bAlternateSetting),
-				IfClass:    Class(alt.bInterfaceClass),
+				Number:     uint8(alt.bInterfaceNumber),
+				Alternate:  uint8(alt.bAlternateSetting),
+				IfClass:    uint8(alt.bInterfaceClass),
 				IfSubClass: uint8(alt.bInterfaceSubClass),
 				IfProtocol: uint8(alt.bInterfaceProtocol),
 			}
@@ -83,11 +110,12 @@ func newConfig(cfg *C.struct_libusb_config_descriptor) *Config {
 			for _, end := range ends {
 				i.Endpoints = append(i.Endpoints, &Endpoint{
 					Type:          DescriptorType(end.bDescriptorType),
-					Address:       ID(end.bEndpointAddress),
+					Address:       uint8(end.bEndpointAddress),
+					Attributes:    uint8(end.bmAttributes),
 					MaxPacketSize: uint16(end.wMaxPacketSize),
 					PollInterval:  uint8(end.bInterval),
 					RefreshRate:   uint8(end.bRefresh),
-					SynchAddress:  ID(end.bSynchAddress),
+					SynchAddress:  uint8(end.bSynchAddress),
 				})
 			}
 			descs = append(descs, i)
diff --git a/usb/descriptor.go b/usb/descriptor.go
index d5abf02..657d246 100644
--- a/usb/descriptor.go
+++ b/usb/descriptor.go
@@ -9,9 +9,9 @@ type Descriptor struct {
 
 	Type     DescriptorType // The type of this descriptor
 	Spec     BCD            // USB Specification Release Number
-	Class    Class          // The class of this device
-	SubClass uint8          // The sub-class (within the class) of this device
-	Protocol uint8          // The protocol (within the sub-class) of this device
+	Class    uint8             // The class of this device
+	SubClass uint8             // The sub-class (within the class) of this device
+	Protocol uint8             // The protocol (within the sub-class) of this device
 	Vendor   ID             // The 8-bit Vendor identifer
 	Product  ID             // The 8-bit Product identifier
 	Device   BCD            // The device version
@@ -26,7 +26,7 @@ func newDescriptor(dev *C.libusb_device) (*Descriptor, error) {
 		desc:     &desc,
 		Type:     DescriptorType(desc.bDescriptorType),
 		Spec:     BCD(desc.bcdUSB),
-		Class:    Class(desc.bDeviceClass),
+		Class:    uint8(desc.bDeviceClass),
 		SubClass: uint8(desc.bDeviceSubClass),
 		Protocol: uint8(desc.bDeviceProtocol),
 		Vendor:   ID(desc.idVendor),
@@ -147,13 +147,15 @@ func (dt DescriptorType) String() string {
 type EndpointDirection int
 
 const (
-	ENDPOINT_IN  EndpointDirection = C.LIBUSB_ENDPOINT_IN
-	ENDPOINT_OUT EndpointDirection = C.LIBUSB_ENDPOINT_OUT
+	ENDPOINT_NUM_MASK                   = 0x03
+	ENDPOINT_DIR_IN   EndpointDirection = C.LIBUSB_ENDPOINT_IN
+	ENDPOINT_DIR_OUT  EndpointDirection = C.LIBUSB_ENDPOINT_OUT
+	ENDPOINT_DIR_MASK EndpointDirection = 0x80
 )
 
 var endpointDirectionDescription = map[EndpointDirection]string{
-	ENDPOINT_IN:  "device-to-host",
-	ENDPOINT_OUT: "host-to-device",
+	ENDPOINT_DIR_IN:  "IN",
+	ENDPOINT_DIR_OUT: "OUT",
 }
 
 func (ed EndpointDirection) String() string {
@@ -167,6 +169,7 @@ const (
 	TRANSFER_TYPE_ISOCHRONOUS TransferType = C.LIBUSB_TRANSFER_TYPE_ISOCHRONOUS
 	TRANSFER_TYPE_BULK        TransferType = C.LIBUSB_TRANSFER_TYPE_BULK
 	TRANSFER_TYPE_INTERRUPT   TransferType = C.LIBUSB_TRANSFER_TYPE_INTERRUPT
+	TRANSFER_TYPE_MASK        TransferType = 0x03
 )
 
 var transferTypeDescription = map[TransferType]string{
@@ -183,14 +186,15 @@ func (tt TransferType) String() string {
 type IsoSyncType int
 
 const (
-	ISO_SYNC_TYPE_NONE     IsoSyncType = C.LIBUSB_ISO_SYNC_TYPE_NONE
-	ISO_SYNC_TYPE_ASYNC    IsoSyncType = C.LIBUSB_ISO_SYNC_TYPE_ASYNC
-	ISO_SYNC_TYPE_ADAPTIVE IsoSyncType = C.LIBUSB_ISO_SYNC_TYPE_ADAPTIVE
-	ISO_SYNC_TYPE_SYNC     IsoSyncType = C.LIBUSB_ISO_SYNC_TYPE_SYNC
+	ISO_SYNC_TYPE_NONE     IsoSyncType = C.LIBUSB_ISO_SYNC_TYPE_NONE << 2
+	ISO_SYNC_TYPE_ASYNC    IsoSyncType = C.LIBUSB_ISO_SYNC_TYPE_ASYNC << 2
+	ISO_SYNC_TYPE_ADAPTIVE IsoSyncType = C.LIBUSB_ISO_SYNC_TYPE_ADAPTIVE << 2
+	ISO_SYNC_TYPE_SYNC     IsoSyncType = C.LIBUSB_ISO_SYNC_TYPE_SYNC << 2
+	ISO_SYNC_TYPE_MASK     IsoSyncType = 0x0C
 )
 
 var isoSyncTypeDescription = map[IsoSyncType]string{
-	ISO_SYNC_TYPE_NONE:     "no synchronization",
+	ISO_SYNC_TYPE_NONE:     "unsynchronized",
 	ISO_SYNC_TYPE_ASYNC:    "asynchronous",
 	ISO_SYNC_TYPE_ADAPTIVE: "adaptive",
 	ISO_SYNC_TYPE_SYNC:     "synchronous",
@@ -203,9 +207,10 @@ func (ist IsoSyncType) String() string {
 type IsoUsageType int
 
 const (
-	ISO_USAGE_TYPE_DATA     IsoUsageType = C.LIBUSB_ISO_USAGE_TYPE_DATA
-	ISO_USAGE_TYPE_FEEDBACK IsoUsageType = C.LIBUSB_ISO_USAGE_TYPE_FEEDBACK
-	ISO_USAGE_TYPE_IMPLICIT IsoUsageType = C.LIBUSB_ISO_USAGE_TYPE_IMPLICIT
+	ISO_USAGE_TYPE_DATA     IsoUsageType = C.LIBUSB_ISO_USAGE_TYPE_DATA << 4
+	ISO_USAGE_TYPE_FEEDBACK IsoUsageType = C.LIBUSB_ISO_USAGE_TYPE_FEEDBACK << 4
+	ISO_USAGE_TYPE_IMPLICIT IsoUsageType = C.LIBUSB_ISO_USAGE_TYPE_IMPLICIT << 4
+	ISO_USAGE_TYPE_MASK     IsoUsageType = 0x30
 )
 
 var isoUsageTypeDescription = map[IsoUsageType]string{
diff --git a/usb/device.go b/usb/device.go
index 5d87a5c..89e4833 100644
--- a/usb/device.go
+++ b/usb/device.go
@@ -8,6 +8,7 @@ import (
 	"log"
 	"reflect"
 	"runtime"
+	"time"
 	"unsafe"
 )
 
@@ -89,6 +90,7 @@ func (d *Device) Reset() error {
 	return nil
 }
 
+var ControlTimeout = 5*time.Second
 func (d *Device) Control(rType, request uint8, val, idx uint16, data []byte) (int, error) {
 	dataSlice := (*reflect.SliceHeader)(unsafe.Pointer(&data))
 	n := C.libusb_control_transfer(
@@ -99,13 +101,28 @@ func (d *Device) Control(rType, request uint8, val, idx uint16, data []byte) (in
 		C.uint16_t(idx),
 		(*C.uchar)(unsafe.Pointer(dataSlice.Data)),
 		C.uint16_t(len(data)),
-		0)
+		C.uint(ControlTimeout/time.Millisecond))
 	if n < 0 {
 		return int(n), usbError(n)
 	}
 	return int(n), nil
 }
 
+func (d *Device) ActiveConfig() (int, error) {
+	var cfg C.int
+	if errno := C.libusb_get_configuration(d.handle, &cfg); errno < 0 {
+		return 0, usbError(errno)
+	}
+	return int(cfg), nil
+}
+
+func (d *Device) SetConfig(cfg int) error {
+	if errno := C.libusb_set_configuration(d.handle, C.int(cfg)); errno < 0 {
+		return usbError(errno)
+	}
+	return nil
+}
+
 func (d *Device) Close() error {
 	if d.handle != nil {
 		log.Printf("device %p closed", d.handle)
diff --git a/usb/usb_test.go b/usb/usb_test.go
index 10c8fd0..e36863b 100644
--- a/usb/usb_test.go
+++ b/usb/usb_test.go
@@ -45,14 +45,8 @@ func TestEnum(t *testing.T) {
 		bus := dev.BusNumber()
 		addr := dev.Address()
 
-		t.Logf("%03d:%03d %+v", bus, addr, desc)
-		if v, ok := usbid.Vendors[desc.Vendor]; ok {
-			if p, ok := v.Devices[desc.Product]; ok {
-				t.Logf(" - %s (%s) %s (%s)", v, desc.Vendor, p, desc.Product)
-			} else {
-				t.Logf(" - %s (%s) Unknown", v, desc.Vendor)
-			}
-		}
+		t.Logf("%03d:%03d %s", bus, addr, usbid.Describe(desc))
+		t.Logf("- Protocol: %s", usbid.Classify(desc))
 
 		cfgs, err := dev.Configurations()
 		defer func() {
@@ -61,21 +55,23 @@ func TestEnum(t *testing.T) {
 			}
 		}()
 		if err != nil {
-			t.Errorf("   - configs: %s", err)
+			t.Errorf("  - configs: %s", err)
 			continue
 		}
 
 		for _, cfg := range cfgs {
-			t.Logf("   - %#v", cfg)
+			t.Logf("- %s:", cfg)
 			for _, alt := range cfg.Interfaces {
+				t.Logf("  --------------")
 				for _, iface := range alt {
-					t.Logf("     - %#v", iface)
+					t.Logf("  - %s", iface)
+					t.Logf("    - %s", usbid.Classify(iface))
 					for _, end := range iface.Endpoints {
-						t.Logf("       - %#v", end)
+						t.Logf("    - %s", end)
 					}
 				}
-				t.Logf("     -----")
 			}
+			t.Logf("  --------------")
 		}
 	}
 }
diff --git a/usbid/describe.go b/usbid/describe.go
new file mode 100644
index 0000000..26f0b22
--- /dev/null
+++ b/usbid/describe.go
@@ -0,0 +1,48 @@
+package usbid
+
+import (
+	"fmt"
+
+	"github.com/kylelemons/gousb/usb"
+)
+
+// Describe one of the following:
+//   - *usb.Descriptor       Product (Vendor)
+func Describe(val interface{}) string {
+	switch val := val.(type) {
+	case *usb.Descriptor:
+		if v, ok := Vendors[val.Vendor]; ok {
+			if d, ok := v.Product[val.Product]; ok {
+				return fmt.Sprintf("%s (%s)", d, v)
+			}
+			return fmt.Sprintf("Unknown (%s)", v)
+		}
+		return fmt.Sprintf("Unknown %s:%s", val.Vendor, val.Product)
+	}
+	return fmt.Sprintf("Unknown (%T)", val)
+}
+
+// Classify one of the following:
+//   - *usb.Descriptor       Class SubClass Protocol
+func Classify(val interface{}) string {
+	var class, sub, proto uint8
+	switch val := val.(type) {
+	case *usb.Descriptor:
+		class, sub, proto = val.Class, val.SubClass, val.Protocol
+	case *usb.Interface:
+		class, sub, proto = val.IfClass, val.IfSubClass, val.IfProtocol
+	default:
+		return fmt.Sprintf("Unknown (%T)", val)
+	}
+
+	if c, ok := Classes[class]; ok {
+		if s, ok := c.SubClass[sub]; ok {
+			if p, ok := s.Protocol[proto]; ok {
+				return fmt.Sprintf("%s (%s) %s", c, s, p)
+			}
+			return fmt.Sprintf("%s (%s)", c, s)
+		}
+		return fmt.Sprintf("%s", c)
+	}
+	return fmt.Sprintf("Unknown %s.%s.%s", class, sub, proto)
+}
diff --git a/usbid/load.go b/usbid/load.go
index 719462a..f7c59d9 100644
--- a/usbid/load.go
+++ b/usbid/load.go
@@ -13,6 +13,7 @@ const (
 )
 
 var Vendors map[usb.ID]*Vendor
+var Classes map[uint8]*Class
 
 func LoadFromURL(url string) error {
 	resp, err := http.Get(url)
@@ -21,21 +22,23 @@ func LoadFromURL(url string) error {
 	}
 	defer resp.Body.Close()
 
-	ids, err := ParseIDs(resp.Body)
+	ids, cls, err := ParseIDs(resp.Body)
 	if err != nil {
 		return err
 	}
 
 	Vendors = ids
+	Classes = cls
 	return nil
 }
 
 func init() {
-	ids, err := ParseIDs(strings.NewReader(usbIdListData))
+	ids, cls, err := ParseIDs(strings.NewReader(usbIdListData))
 	if err != nil {
 		log.Printf("usbid: failed to parse: %s", err)
 		return
 	}
 
 	Vendors = ids
+	Classes = cls
 }
diff --git a/usbid/parse.go b/usbid/parse.go
index a8c1ab2..83b1403 100644
--- a/usbid/parse.go
+++ b/usbid/parse.go
@@ -12,39 +12,45 @@ import (
 
 type Vendor struct {
 	Name    string
-	Devices map[usb.ID]*Device
+	Product map[usb.ID]*Product
 }
 
 func (v Vendor) String() string {
 	return v.Name
 }
 
-// TODO(kevlar) s/device/
-type Device struct {
+type Product struct {
 	Name       string
-	Interfaces map[usb.ID]string
+	Interface map[usb.ID]string
 }
 
-func (d Device) String() string {
-	return d.Name
+func (p Product) String() string {
+	return p.Name
 }
 
-/*
 type Class struct {
 	Name string
-	SubClass map[usb.ID]*SubClass
+	SubClass map[uint8]*SubClass
+}
+
+func (c Class) String() string {
+	return c.Name
 }
 
 type SubClass struct {
 	Name string
-	Protocol map[usb.ID]string
+	Protocol map[uint8]string
 }
-*/
 
-func ParseIDs(r io.Reader) (map[usb.ID]*Vendor, error) {
+func (s SubClass) String() string {
+	return s.Name
+}
+
+func ParseIDs(r io.Reader) (map[usb.ID]*Vendor, map[uint8]*Class, error) {
 	vendors := make(map[usb.ID]*Vendor, 2800)
+	classes := make(map[uint8]*Class) // TODO(kevlar): count
 
-	split := func(s string) (kind string, level int, id usb.ID, name string, err error) {
+	split := func(s string) (kind string, level int, id uint64, name string, err error) {
 		pieces := strings.SplitN(s, "  ", 2)
 		if len(pieces) != 2 {
 			err = fmt.Errorf("malformatted line %q", s)
@@ -71,16 +77,18 @@ func ParseIDs(r io.Reader) (map[usb.ID]*Vendor, error) {
 			err = fmt.Errorf("malformatted id %q: %s", pieces[0], err)
 			return
 		}
-		id = usb.ID(i)
+		id = i
 
 		return
 	}
 
 	// Hold the interim values
 	var vendor *Vendor
-	var device *Device
+	var device *Product
+
+	parseVendor := func(level int, raw uint64, name string) error {
+		id := usb.ID(raw)
 
-	parseVendor := func(level int, id usb.ID, name string) error {
 		switch level {
 		case 0:
 			vendor = &Vendor{
@@ -93,23 +101,23 @@ func ParseIDs(r io.Reader) (map[usb.ID]*Vendor, error) {
 				return fmt.Errorf("product line without vendor line")
 			}
 
-			device = &Device{
+			device = &Product{
 				Name: name,
 			}
-			if vendor.Devices == nil {
-				vendor.Devices = make(map[usb.ID]*Device)
+			if vendor.Product == nil {
+				vendor.Product = make(map[usb.ID]*Product)
 			}
-			vendor.Devices[id] = device
+			vendor.Product[id] = device
 
 		case 2:
 			if device == nil {
 				return fmt.Errorf("interface line without device line")
 			}
 
-			if device.Interfaces == nil {
-				device.Interfaces = make(map[usb.ID]string)
+			if device.Interface == nil {
+				device.Interface = make(map[usb.ID]string)
 			}
-			device.Interfaces[id] = name
+			device.Interface[id] = name
 
 		default:
 			return fmt.Errorf("too many levels of nesting for vendor block")
@@ -118,6 +126,50 @@ func ParseIDs(r io.Reader) (map[usb.ID]*Vendor, error) {
 		return nil
 	}
 
+	// Hold the interim values
+	var class *Class
+	var subclass *SubClass
+
+	parseClass := func(level int, raw uint64, name string) error {
+		id := uint8(raw)
+
+		switch level {
+		case 0:
+			class = &Class{
+				Name: name,
+			}
+			classes[id] = class
+
+		case 1:
+			if class == nil {
+				return fmt.Errorf("subclass line without class line")
+			}
+
+			subclass = &SubClass{
+				Name: name,
+			}
+			if class.SubClass == nil {
+				class.SubClass = make(map[uint8]*SubClass)
+			}
+			class.SubClass[id] = subclass
+
+		case 2:
+			if subclass == nil {
+				return fmt.Errorf("protocol line without subclass line")
+			}
+
+			if subclass.Protocol == nil {
+				subclass.Protocol = make(map[uint8]string)
+			}
+			subclass.Protocol[id] = name
+
+		default:
+			return fmt.Errorf("too many levels of nesting for class")
+		}
+
+		return nil
+	}
+
 	// TODO(kevlar): Parse class information, etc
 	//var class *Class
 	//var subclass *SubClass
@@ -132,9 +184,9 @@ parseLines:
 		case err == io.EOF:
 			break parseLines
 		case err != nil:
-			return nil, err
+			return nil, nil, err
 		case isPrefix:
-			return nil, fmt.Errorf("line %d: line too long", lineno)
+			return nil, nil, fmt.Errorf("line %d: line too long", lineno)
 		}
 		line := string(b)
 
@@ -144,7 +196,7 @@ parseLines:
 
 		k, level, id, name, err := split(line)
 		if err != nil {
-			return nil, fmt.Errorf("line %d: %s", lineno, err)
+			return nil, nil, fmt.Errorf("line %d: %s", lineno, err)
 		}
 		if k != "" {
 			kind = k
@@ -153,11 +205,13 @@ parseLines:
 		switch kind {
 		case "":
 			err = parseVendor(level, id, name)
+		case "C":
+			err = parseClass(level, id, name)
 		}
 		if err != nil {
-			return nil, fmt.Errorf("line %d: %s", lineno, err)
+			return nil, nil, fmt.Errorf("line %d: %s", lineno, err)
 		}
 	}
 
-	return vendors, nil
+	return vendors, classes, nil
 }