Index: uspace/lib/usb/include/usb/classes/classes.h
===================================================================
--- uspace/lib/usb/include/usb/classes/classes.h	(revision 1efe89b1e7ca890cc3565fca0d6e6e03e52481e1)
+++ uspace/lib/usb/include/usb/classes/classes.h	(revision f16a76b14cc9449099e618ef23b464c95e7df9d2)
@@ -31,5 +31,5 @@
  */
 /** @file
- * @brief USB device classes and subclasses.
+ * USB device classes (generic constants and functions).
  */
 #ifndef LIBUSB_CLASSES_H_
Index: uspace/lib/usb/include/usb/debug.h
===================================================================
--- uspace/lib/usb/include/usb/debug.h	(revision 1efe89b1e7ca890cc3565fca0d6e6e03e52481e1)
+++ uspace/lib/usb/include/usb/debug.h	(revision f16a76b14cc9449099e618ef23b464c95e7df9d2)
@@ -31,5 +31,5 @@
  */
 /** @file
- * @brief Debugging related functions.
+ * Debugging related functions.
  */
 #ifndef LIBUSB_DEBUG_H_
@@ -39,7 +39,4 @@
 #include <assert.h>
 
-void usb_dprintf(const char *tag, int level, const char *format, ...);
-void usb_dprintf_enable(const char *tag, int level);
-
 void usb_dump_standard_descriptor(FILE *, const char *, const char *,
     const uint8_t *, size_t);
@@ -47,10 +44,36 @@
 /** Logging level. */
 typedef enum {
+	/** Fatal, unrecoverable, error.
+	 * Such error prevents the driver from working at all.
+	 */
 	USB_LOG_LEVEL_FATAL,
+
+	/** Serious but recoverable error
+	 * Shall be used for errors fatal for single device but not for
+	 * driver itself.
+	 */
 	USB_LOG_LEVEL_ERROR,
+
+	/** Warning.
+	 * Problems from which the driver is able to recover gracefully.
+	 */
 	USB_LOG_LEVEL_WARNING,
+
+	/** Information message.
+	 * This should be the last level that is printed by default to
+	 * the screen.
+	 * Typical usage is to inform that new device was found and what
+	 * are its capabilities.
+	 * Do not use for repetitive actions (such as device polling).
+	 */
 	USB_LOG_LEVEL_INFO,
+
+	/** Debugging message. */
 	USB_LOG_LEVEL_DEBUG,
+
+	/** More detailed debugging message. */
 	USB_LOG_LEVEL_DEBUG2,
+
+	/** Terminating constant for logging levels. */
 	USB_LOG_LEVEL_MAX
 } usb_log_level_t;
@@ -61,19 +84,25 @@
 void usb_log_printf(usb_log_level_t, const char *, ...);
 
+/** Log fatal error. */
 #define usb_log_fatal(format, ...) \
 	usb_log_printf(USB_LOG_LEVEL_FATAL, format, ##__VA_ARGS__)
 
+/** Log normal (recoverable) error. */
 #define usb_log_error(format, ...) \
 	usb_log_printf(USB_LOG_LEVEL_ERROR, format, ##__VA_ARGS__)
 
+/** Log warning. */
 #define usb_log_warning(format, ...) \
 	usb_log_printf(USB_LOG_LEVEL_WARNING, format, ##__VA_ARGS__)
 
+/** Log informational message. */
 #define usb_log_info(format, ...) \
 	usb_log_printf(USB_LOG_LEVEL_INFO, format, ##__VA_ARGS__)
 
+/** Log debugging message. */
 #define usb_log_debug(format, ...) \
 	usb_log_printf(USB_LOG_LEVEL_DEBUG, format, ##__VA_ARGS__)
 
+/** Log verbose debugging message. */
 #define usb_log_debug2(format, ...) \
 	usb_log_printf(USB_LOG_LEVEL_DEBUG2, format, ##__VA_ARGS__)
Index: uspace/lib/usb/include/usb/descriptor.h
===================================================================
--- uspace/lib/usb/include/usb/descriptor.h	(revision 1efe89b1e7ca890cc3565fca0d6e6e03e52481e1)
+++ uspace/lib/usb/include/usb/descriptor.h	(revision f16a76b14cc9449099e618ef23b464c95e7df9d2)
@@ -31,5 +31,5 @@
  */
 /** @file
- * @brief Standard USB descriptors.
+ * Standard USB descriptors.
  */
 #ifndef LIBUSB_DESCRIPTOR_H_
@@ -83,5 +83,5 @@
 	/** Product descriptor index. */
 	uint8_t str_product;
-	/** Device serial number desriptor index. */
+	/** Device serial number descriptor index. */
 	uint8_t str_serial_number;
 	/** Number of possible configurations. */
@@ -167,7 +167,4 @@
 } __attribute__ ((packed)) usb_standard_endpoint_descriptor_t;
 
-
-/* TODO: string descriptors. */
-
 #endif
 /**
Index: uspace/lib/usb/include/usb/dp.h
===================================================================
--- uspace/lib/usb/include/usb/dp.h	(revision 1efe89b1e7ca890cc3565fca0d6e6e03e52481e1)
+++ uspace/lib/usb/include/usb/dp.h	(revision f16a76b14cc9449099e618ef23b464c95e7df9d2)
@@ -31,5 +31,5 @@
  */
 /** @file
- * @brief USB descriptor parser.
+ * USB descriptor parser.
  */
 #ifndef LIBUSB_DP_H_
@@ -40,6 +40,15 @@
 #include <usb/descriptor.h>
 
+/** USB descriptors nesting.
+ * The nesting describes the logical tree USB descriptors form
+ * (e.g. that endpoint descriptor belongs to interface or that
+ * interface belongs to configuration).
+ *
+ * See usb_descriptor_type_t for descriptor constants.
+ */
 typedef struct {
+	/** Child descriptor id. */
 	int child;
+	/** Parent descriptor id. */
 	int parent;
 } usb_dp_descriptor_nesting_t;
@@ -47,11 +56,17 @@
 extern usb_dp_descriptor_nesting_t usb_dp_standard_descriptor_nesting[];
 
+/** Descriptor parser structure. */
 typedef struct {
+	/** Used descriptor nesting. */
 	usb_dp_descriptor_nesting_t *nesting;
 } usb_dp_parser_t;
 
+/** Descriptor parser data. */
 typedef struct {
+	/** Data to be parsed. */
 	uint8_t *data;
+	/** Size of input data in bytes. */
 	size_t size;
+	/** Custom argument. */
 	void *arg;
 } usb_dp_parser_data_t;
Index: uspace/lib/usb/include/usb/hub.h
===================================================================
--- uspace/lib/usb/include/usb/hub.h	(revision 1efe89b1e7ca890cc3565fca0d6e6e03e52481e1)
+++ uspace/lib/usb/include/usb/hub.h	(revision f16a76b14cc9449099e618ef23b464c95e7df9d2)
@@ -32,4 +32,6 @@
 /** @file
  * Functions needed by hub drivers.
+ *
+ * For class specific requests, see usb/classes/hub.h.
  */
 #ifndef LIBUSB_HUB_H_
Index: uspace/lib/usb/include/usb/pipes.h
===================================================================
--- uspace/lib/usb/include/usb/pipes.h	(revision 1efe89b1e7ca890cc3565fca0d6e6e03e52481e1)
+++ uspace/lib/usb/include/usb/pipes.h	(revision f16a76b14cc9449099e618ef23b464c95e7df9d2)
@@ -43,6 +43,5 @@
 #include <ddf/driver.h>
 
-/**
- * Abstraction of a physical connection to the device.
+/** Abstraction of a physical connection to the device.
  * This type is an abstraction of the USB wire that connects the host and
  * the function (device).
@@ -55,6 +54,5 @@
 } usb_device_connection_t;
 
-/**
- * Abstraction of a logical connection to USB device endpoint.
+/** Abstraction of a logical connection to USB device endpoint.
  * It encapsulates endpoint attributes (transfer type etc.) as well
  * as information about currently running sessions.
@@ -111,5 +109,5 @@
 	/** Found descriptor fitting the description. */
 	usb_standard_endpoint_descriptor_t *descriptor;
-	/** Interface the endpoint belongs to. */
+	/** Interface descriptor the endpoint belongs to. */
 	usb_standard_interface_descriptor_t *interface;
 	/** Whether the endpoint was actually found. */
Index: uspace/lib/usb/include/usb/request.h
===================================================================
--- uspace/lib/usb/include/usb/request.h	(revision 1efe89b1e7ca890cc3565fca0d6e6e03e52481e1)
+++ uspace/lib/usb/include/usb/request.h	(revision f16a76b14cc9449099e618ef23b464c95e7df9d2)
@@ -72,5 +72,5 @@
 	union {
 		uint16_t value;
-		/* FIXME: add #ifdefs according to host endianess */
+		/* FIXME: add #ifdefs according to host endianness */
 		struct {
 			uint8_t value_low;
Index: uspace/lib/usb/include/usb/usb.h
===================================================================
--- uspace/lib/usb/include/usb/usb.h	(revision 1efe89b1e7ca890cc3565fca0d6e6e03e52481e1)
+++ uspace/lib/usb/include/usb/usb.h	(revision f16a76b14cc9449099e618ef23b464c95e7df9d2)
@@ -31,5 +31,5 @@
  */
 /** @file
- * @brief Base USB types.
+ * Common USB types and functions.
  */
 #ifndef LIBUSB_USB_H_
@@ -121,4 +121,10 @@
 } usb_target_t;
 
+/** Compare USB targets (addresses and endpoints).
+ *
+ * @param a First target.
+ * @param b Second target.
+ * @return Whether @p a and @p b points to the same pipe on the same device.
+ */
 static inline int usb_target_same(usb_target_t a, usb_target_t b)
 {