Index: uspace/drv/bus/usb/usbhid/kbd/kbddev.c
===================================================================
--- uspace/drv/bus/usb/usbhid/kbd/kbddev.c	(revision 2df6f6fe4f21b8f1ebefce19a6d94cd3137976f0)
+++ uspace/drv/bus/usb/usbhid/kbd/kbddev.c	(revision 948911d932e23606af8586bec7e27dd956147234)
@@ -71,4 +71,6 @@
 #include "../usbhid.h"
 
+static void default_connection_handler(ddf_fun_t *, ipc_callid_t, ipc_call_t *);
+static ddf_dev_ops_t kbdops = { .default_handler = default_connection_handler };
 /*----------------------------------------------------------------------------*/
 
@@ -187,6 +189,6 @@
 			break;
 		}
-		if (kbd_dev->console_sess == NULL) {
-			kbd_dev->console_sess = sess;
+		if (kbd_dev->client_sess == NULL) {
+			kbd_dev->client_sess = sess;
 			usb_log_debug("%s: OK\n", __FUNCTION__);
 			async_answer_0(icallid, EOK);
@@ -292,5 +294,5 @@
 {
 	usb_log_debug2("Sending kbdev event %d/%d to the console\n", type, key);
-	if (kbd_dev->console_sess == NULL) {
+	if (kbd_dev->client_sess == NULL) {
 		usb_log_warning(
 		    "Connection to console not ready, key discarded.\n");
@@ -298,5 +300,5 @@
 	}
 
-	async_exch_t *exch = async_exchange_begin(kbd_dev->console_sess);
+	async_exch_t *exch = async_exchange_begin(kbd_dev->client_sess);
 	if (exch != NULL) {
 		async_msg_2(exch, KBDEV_EVENT, type, key);
@@ -499,5 +501,5 @@
 	/* Store the initialized HID device and HID ops
 	 * to the DDF function. */
-	fun->ops = &kbd_dev->ops;
+	fun->ops = &kbdops;
 	fun->driver_data = kbd_dev;
 
@@ -576,5 +578,4 @@
 	fibril_mutex_initialize(&kbd_dev->repeat_mtx);
 	kbd_dev->initialized = USB_KBD_STATUS_UNINITIALIZED;
-	kbd_dev->ops.default_handler = default_connection_handler;
 
 	/* Store link to HID device */
@@ -737,6 +738,6 @@
 
 	/* Hangup session to the console. */
-	if (kbd_dev->console_sess)
-		async_hangup(kbd_dev->console_sess);
+	if (kbd_dev->client_sess)
+		async_hangup(kbd_dev->client_sess);
 
 	//assert(!fibril_mutex_is_locked((*kbd_dev)->repeat_mtx));
Index: uspace/drv/bus/usb/usbhid/kbd/kbddev.h
===================================================================
--- uspace/drv/bus/usb/usbhid/kbd/kbddev.h	(revision 2df6f6fe4f21b8f1ebefce19a6d94cd3137976f0)
+++ uspace/drv/bus/usb/usbhid/kbd/kbddev.h	(revision 948911d932e23606af8586bec7e27dd956147234)
@@ -82,9 +82,6 @@
 	unsigned lock_keys;
 
-	/** IPC session to the console device (for sending key events). */
-	async_sess_t *console_sess;
-
-	/** @todo What is this actually? */
-	ddf_dev_ops_t ops;
+	/** IPC session to client (for sending key events). */
+	async_sess_t *client_sess;
 
 	/** Information for auto-repeat of keys. */
Index: uspace/drv/bus/usb/usbhid/mouse/mousedev.c
===================================================================
--- uspace/drv/bus/usb/usbhid/mouse/mousedev.c	(revision 2df6f6fe4f21b8f1ebefce19a6d94cd3137976f0)
+++ uspace/drv/bus/usb/usbhid/mouse/mousedev.c	(revision 948911d932e23606af8586bec7e27dd956147234)
@@ -54,6 +54,9 @@
 #define NAME "mouse"
 
-/*----------------------------------------------------------------------------*/
-
+static void default_connection_handler(ddf_fun_t *, ipc_callid_t, ipc_call_t *);
+
+static ddf_dev_ops_t ops = { .default_handler = default_connection_handler };
+
+/*----------------------------------------------------------------------------*/
 const usb_endpoint_description_t usb_hid_mouse_poll_endpoint_description = {
 	.transfer_type = USB_TRANSFER_INTERRUPT,
@@ -221,20 +224,10 @@
 		assert(index < mouse_dev->buttons_count);
 
-		if (mouse_dev->buttons[index] == 0 && field->value != 0) {
+		if (mouse_dev->buttons[index] != field->value) {
 			async_exch_t *exch =
 			    async_exchange_begin(mouse_dev->mouse_sess);
 			if (exch != NULL) {
 				async_req_2_0(exch, MOUSEEV_BUTTON_EVENT,
-				    field->usage, 1);
-				async_exchange_end(exch);
-				mouse_dev->buttons[index] = field->value;
-			}
-
-		} else if (mouse_dev->buttons[index] != 0 && field->value == 0) {
-			async_exch_t *exch =
-			    async_exchange_begin(mouse_dev->mouse_sess);
-			if (exch != NULL) {
-				async_req_2_0(exch, MOUSEEV_BUTTON_EVENT,
-				    field->usage, 0);
+				    field->usage, (field->value != 0) ? 1 : 0);
 				async_exchange_end(exch);
 				mouse_dev->buttons[index] = field->value;
@@ -279,5 +272,5 @@
 	}
 
-	fun->ops = &mouse->ops;
+	fun->ops = &ops;
 	fun->driver_data = mouse;
 
@@ -302,5 +295,4 @@
 	}
 	mouse->mouse_fun = fun;
-
 	return EOK;
 }
@@ -379,7 +371,4 @@
 	}
 
-	// set handler for incoming calls
-	mouse_dev->ops.default_handler = default_connection_handler;
-
 	// TODO: how to know if the device supports the request???
 	usbhid_req_set_idle(&hid_dev->usb_dev->ctrl_pipe,
Index: uspace/drv/bus/usb/usbhid/mouse/mousedev.h
===================================================================
--- uspace/drv/bus/usb/usbhid/mouse/mousedev.h	(revision 2df6f6fe4f21b8f1ebefce19a6d94cd3137976f0)
+++ uspace/drv/bus/usb/usbhid/mouse/mousedev.h	(revision 948911d932e23606af8586bec7e27dd956147234)
@@ -46,5 +46,5 @@
 /** Container for USB mouse device. */
 typedef struct {
-	/** IPC session to console (consumer). */
+	/** IPC session to consumer. */
 	async_sess_t *mouse_sess;
 
@@ -53,5 +53,4 @@
 	size_t buttons_count;
 
-	ddf_dev_ops_t ops;
 	/* DDF mouse function */
 	ddf_fun_t *mouse_fun;
Index: uspace/lib/drv/generic/remote_usb.c
===================================================================
--- uspace/lib/drv/generic/remote_usb.c	(revision 2df6f6fe4f21b8f1ebefce19a6d94cd3137976f0)
+++ uspace/lib/drv/generic/remote_usb.c	(revision 948911d932e23606af8586bec7e27dd956147234)
@@ -56,5 +56,5 @@
 {
 	if (!exch)
-		return EINVAL;
+		return EBADMEM;
 	sysarg_t addr;
 	const int ret = async_req_1_1(exch, DEV_IFACE_ID(USB_DEV_IFACE),
@@ -75,5 +75,5 @@
 {
 	if (!exch)
-		return EINVAL;
+		return EBADMEM;
 	sysarg_t iface_no;
 	const int ret = async_req_1_1(exch, DEV_IFACE_ID(USB_DEV_IFACE),
@@ -92,5 +92,5 @@
 {
 	if (!exch)
-		return EINVAL;
+		return EBADMEM;
 	devman_handle_t h;
 	const int ret = async_req_1_1(exch, DEV_IFACE_ID(USB_DEV_IFACE),
Index: uspace/lib/drv/generic/remote_usbhc.c
===================================================================
--- uspace/lib/drv/generic/remote_usbhc.c	(revision 2df6f6fe4f21b8f1ebefce19a6d94cd3137976f0)
+++ uspace/lib/drv/generic/remote_usbhc.c	(revision 948911d932e23606af8586bec7e27dd956147234)
@@ -165,5 +165,5 @@
 {
 	if (!exch || !address)
-		return EINVAL;
+		return EBADMEM;
 	sysarg_t new_address;
 	const int ret = async_req_4_1(exch, DEV_IFACE_ID(USBHC_DEV_IFACE),
@@ -178,5 +178,5 @@
 {
 	if (!exch)
-		return EINVAL;
+		return EBADMEM;
 	return async_req_3_0(exch, DEV_IFACE_ID(USBHC_DEV_IFACE),
 	    IPC_M_USBHC_BIND_ADDRESS, address, handle);
@@ -187,5 +187,5 @@
 {
 	if (!exch)
-		return EINVAL;
+		return EBADMEM;
 	sysarg_t h;
 	const int ret = async_req_2_1(exch, DEV_IFACE_ID(USBHC_DEV_IFACE),
@@ -199,5 +199,5 @@
 {
 	if (!exch)
-		return EINVAL;
+		return EBADMEM;
 	return async_req_2_0(exch, DEV_IFACE_ID(USBHC_DEV_IFACE),
 	    IPC_M_USBHC_RELEASE_ADDRESS, address);
@@ -209,5 +209,5 @@
 {
 	if (!exch)
-		return EINVAL;
+		return EBADMEM;
 	const usb_target_t target =
 	    {{ .address = address, .endpoint = endpoint }};
@@ -225,5 +225,5 @@
 {
 	if (!exch)
-		return EINVAL;
+		return EBADMEM;
 	return async_req_4_0(exch, DEV_IFACE_ID(USBHC_DEV_IFACE),
 	    IPC_M_USBHC_UNREGISTER_ENDPOINT, address, endpoint, direction);
@@ -234,9 +234,10 @@
     size_t *rec_size)
 {
+	if (!exch)
+		return EBADMEM;
+
 	if (size == 0 && setup == 0)
 		return EOK;
 
-	if (!exch)
-		return EINVAL;
 	const usb_target_t target =
 	    {{ .address = address, .endpoint = endpoint }};
@@ -288,9 +289,10 @@
     usb_endpoint_t endpoint, uint64_t setup, const void *data, size_t size)
 {
+	if (!exch)
+		return EBADMEM;
+
 	if (size == 0 && setup == 0)
 		return EOK;
 
-	if (!exch)
-		return EINVAL;
 	const usb_target_t target =
 	    {{ .address = address, .endpoint = endpoint }};
