diff --git a/ccid/Makefile b/ccid/Makefile
index 317fcbd..cd8321f 100644
--- a/ccid/Makefile
+++ b/ccid/Makefile
@@ -1,7 +1,7 @@
 CFLAGS=-Wall -g
 
 ccid_functionfs: ccid_main_functionfs.o ccid_proto.o ccid_device.o
-	$(CC) $(CFLAGS) -lasan -losmocore -laio -o $@ $^
+	$(CC) $(CFLAGS) -lasan -losmocore -ltalloc -laio -o $@ $^
 
 %.o: %.c
 	$(CC) $(CFLAGS) -o $@ -c $^
diff --git a/ccid/ccid_device.c b/ccid/ccid_device.c
index e3705ae..ffcbacc 100644
--- a/ccid/ccid_device.c
+++ b/ccid/ccid_device.c
@@ -6,6 +6,7 @@
 
 #include <osmocom/core/msgb.h>
 #include <osmocom/core/utils.h>
+#include <osmocom/core/logging.h>
 
 #include "ccid_proto.h"
 #include "ccid_device.h"
@@ -157,6 +158,15 @@
 /* Send given CCID message */
 static int ccid_send(struct ccid_instance *ci, struct msgb *msg)
 {
+	struct ccid_header *ch = (struct ccid_header *) msgb_ccid_in(msg);
+	struct ccid_slot *cs = get_ccid_slot(ci, ch->bSlot);
+	if (cs) {
+		LOGPCS(cs, LOGL_DEBUG, "Tx CCID(IN) %s %s\n",
+			get_value_string(ccid_msg_type_vals, ch->bMessageType), msgb_hexdump(msg));
+	} else {
+		LOGPCI(ci, LOGL_DEBUG, "Tx CCID(IN) %s %s\n",
+			get_value_string(ccid_msg_type_vals, ch->bMessageType), msgb_hexdump(msg));
+	}
 	return ci->ops->send_in(ci, msg);
 }
 
@@ -470,24 +480,32 @@
 	switch (spar->bProtocolNum) {
 	case CCID_PROTOCOL_NUM_T0:
 		rc = decode_ccid_pars_t0(&pars_dec, &spar->abProtocolData.t0);
-		if (rc < 0)
+		if (rc < 0) {
+			LOGP(DCCID, LOGL_ERROR, "SetParameters: Unable to parse T0: %d\n", rc);
 			resp = ccid_gen_parameters_t0(cs, seq, CCID_CMD_STATUS_FAILED, -rc);
+			goto out;
+		}
 		/* FIXME: validate parameters; abort if they are not supported */
 		cs->pars = pars_dec;
 		resp = ccid_gen_parameters_t0(cs, seq, CCID_CMD_STATUS_OK, 0);
 		break;
 	case CCID_PROTOCOL_NUM_T1:
 		rc = decode_ccid_pars_t1(&pars_dec, &spar->abProtocolData.t1);
-		if (rc < 0)
+		if (rc < 0) {
+			LOGP(DCCID, LOGL_ERROR, "SetParameters: Unable to parse T1: %d\n", rc);
 			resp = ccid_gen_parameters_t1(cs, seq, CCID_CMD_STATUS_FAILED, -rc);
+			goto out;
+		}
 		/* FIXME: validate parameters; abort if they are not supported */
 		cs->pars = pars_dec;
 		resp = ccid_gen_parameters_t1(cs, seq, CCID_CMD_STATUS_OK, 0);
 		break;
 	default:
+		LOGP(DCCID, LOGL_ERROR, "SetParameters: Invalid Protocol 0x%02x\n",spar->bProtocolNum);
 		resp = ccid_gen_parameters_t0(cs, seq, CCID_CMD_STATUS_FAILED, 0);
 		break;
 	}
+out:
 	return ccid_slot_send_unbusy(cs, resp);
 }
 
@@ -573,6 +591,7 @@
 	//case PC_to_RDR_Abort: /* seriously? WTF! */
 		break;
 	default:
+		LOGP(DCCID, LOGL_ERROR, "Abort for non-Abortable Message Type\n");
 		/* CCID spec lists CMD_NOT_ABORTED, but gives no numberic value ?!? */
 		resp = ccid_gen_slot_status(cs, seq, CCID_CMD_STATUS_FAILED, CCID_ERR_CMD_NOT_SUPPORTED);
 		return ccid_slot_send_unbusy(cs, resp);
@@ -617,18 +636,23 @@
 	/* Check for invalid slot number */
 	cs = get_ccid_slot(ci, ch->bSlot);
 	if (!cs) {
+		LOGPCI(ci, LOGL_ERROR, "Invalid bSlot %u\n", ch->bSlot);
 		resp = gen_err_resp(ch->bMessageType, ch->bSlot, CCID_ICC_STATUS_NO_ICC, ch->bSeq, 5);
 		return ccid_send(ci, resp);
 	}
 
 	/* Check if slot is already busy; Reject any additional commands meanwhile */
 	if (cs->cmd_busy) {
+		LOGPCS(cs, LOGL_ERROR, "Slot Busy, but another cmd received\n");
 		/* FIXME: ABORT logic as per section 5.3.1 of CCID Spec v1.1 */
 		resp = gen_err_resp(ch->bMessageType, ch->bSlot, get_icc_status(cs), ch->bSeq,
 					CCID_ERR_CMD_SLOT_BUSY);
 		return ccid_send(ci, resp);
 	}
 
+	LOGPCS(cs, LOGL_DEBUG, "Rx CCID(OUT) %s %s\n",
+		get_value_string(ccid_msg_type_vals, ch->bMessageType), msgb_hexdump(msg));
+
 	/* we're now processing a command for the slot; mark slot as busy */
 	cs->cmd_busy = true;
 
@@ -707,6 +731,7 @@
 		break;
 	default:
 		/* generic response with bERror = 0 (command not supported) */
+		LOGP(DCCID, LOGL_NOTICE, "Unknown CCID Message received: 0x%02x\n", ch->bMessageType);
 		resp = gen_err_resp(ch->bMessageType, ch->bSlot, CCID_ICC_STATUS_NO_ICC, ch->bSeq,
 				    CCID_ERR_CMD_NOT_SUPPORTED);
 		return ccid_slot_send_unbusy(cs, resp);
@@ -714,7 +739,7 @@
 	return 0;
 
 short_msg:
-	/* FIXME */
+	LOGP(DCCID, LOGL_ERROR, "Short CCID message received: %s; ignoring\n", msgb_hexdump(msg));
 	return -1;
 }
 
diff --git a/ccid/ccid_device.h b/ccid/ccid_device.h
index 4cdb325..68ec98a 100644
--- a/ccid/ccid_device.h
+++ b/ccid/ccid_device.h
@@ -2,12 +2,16 @@
 #include <stdbool.h>
 #include <stdint.h>
 
+enum {
+	DCCID,
+	DUSB,
+};
 
 #define NR_SLOTS	8
 
 #define LOGPCI(ci, lvl, fmt, args ...) LOGP(DCCID, lvl, "%s: " fmt, (ci)->name, ## args)
 #define LOGPCS(cs, lvl, fmt, args ...) \
-	LOGP(DCCID, lvl, "%s(%u): " fmt, (cc)->ci->name, (cc)->slot_nr, ## args)
+	LOGP(DCCID, lvl, "%s(%u): " fmt, (cs)->ci->name, (cs)->slot_nr, ## args)
 
 struct msgb;
 
diff --git a/ccid/ccid_main_functionfs.c b/ccid/ccid_main_functionfs.c
index 2b57182..717a6ae 100644
--- a/ccid/ccid_main_functionfs.c
+++ b/ccid/ccid_main_functionfs.c
@@ -1,4 +1,5 @@
 
+#include <errno.h>
 #include <stdint.h>
 #include <endian.h>
 #include <sys/types.h>
@@ -132,6 +133,9 @@
 #include <osmocom/core/select.h>
 #include <osmocom/core/utils.h>
 #include <osmocom/core/msgb.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/core/application.h>
+#include <osmocom/core/logging.h>
 
 #include "ccid_device.h"
 
@@ -161,7 +165,7 @@
 
 static int ep_int_cb(struct osmo_fd *ofd, unsigned int what)
 {
-	printf("INT\n");
+	LOGP(DUSB, LOGL_DEBUG, "%s\n", __func__);
 	return 0;
 }
 
@@ -171,7 +175,7 @@
 	struct msgb *msg = msgb_alloc(512, "OUT-Rx");
 	int rc;
 
-	printf("OUT\n");
+	LOGP(DUSB, LOGL_DEBUG, "%s\n", __func__);
 	if (what & BSC_FD_READ) {
 		rc = read(ofd->fd, msgb_data(msg), msgb_tailroom(msg));
 		if (rc <= 0) {
@@ -187,7 +191,7 @@
 
 static int ep_in_cb(struct osmo_fd *ofd, unsigned int what)
 {
-	printf("IN\n");
+	LOGP(DUSB, LOGL_DEBUG, "%s\n", __func__);
 	if (what & BSC_FD_WRITE) {
 		/* write what we have to write */
 	}
@@ -207,11 +211,10 @@
 
 static void handle_setup(const struct usb_ctrlrequest *setup)
 {
-	printf("bRequestType = %d\n", setup->bRequestType);
-	printf("bRequest     = %d\n", setup->bRequest);
-	printf("wValue       = %d\n", le16_to_cpu(setup->wValue));
-	printf("wIndex       = %d\n", le16_to_cpu(setup->wIndex));
-	printf("wLength      = %d\n", le16_to_cpu(setup->wLength));
+	LOGP(DUSB, LOGL_NOTICE, "EP0 SETUP bRequestType=0x%02x, bRequest=0x%02x wValue=0x%04x, "
+		"wIndex=0x%04x, wLength=%u\n", setup->bRequestType, setup->bRequest,
+		le16_to_cpu(setup->wValue), le16_to_cpu(setup->wIndex), le16_to_cpu(setup->wLength));
+	/* FIXME: Handle control transfer */
 }
 
 static void aio_refill_out(struct ufunc_handle *uh);
@@ -221,14 +224,12 @@
 	struct ufunc_handle *uh = (struct ufunc_handle *) ofd->data;
 	int rc;
 
-	printf("EP0\n");
-
 	if (what & BSC_FD_READ) {
 		struct usb_functionfs_event evt;
 		rc = read(ofd->fd, (uint8_t *)&evt, sizeof(evt));
 		if (rc < sizeof(evt))
 			return -23;
-		printf("\t%s\n", get_value_string(ffs_evt_type_names, evt.type));
+		LOGP(DUSB, LOGL_NOTICE, "EP0 %s\n", get_value_string(ffs_evt_type_names, evt.type));
 		switch (evt.type) {
 		case FUNCTIONFS_ENABLE:
 			aio_refill_out(uh);
@@ -248,6 +249,8 @@
 {
 	int rc;
 	struct aio_help *ah = &uh->aio_out;
+
+	LOGP(DUSB, LOGL_DEBUG, "%s\n", __func__);
 	msgb_reset(ah->msg);
 	io_prep_pread(ah->iocb, uh->ep_out.fd, msgb_data(ah->msg), msgb_tailroom(ah->msg), 0);
 	io_set_eventfd(ah->iocb, uh->aio_evfd.fd);
@@ -266,24 +269,31 @@
 	assert(rc == sizeof(ev_cnt));
 
 	rc = io_getevents(uh->aio_ctx, 1, 3, evt, NULL);
-	if (rc <= 0)
+	if (rc <= 0) {
+		LOGP(DUSB, LOGL_ERROR, "error in io_getevents(): %d\n", rc);
 		return rc;
+	}
 
 	for (i = 0; i < rc; i++) {
 		int fd = evt[i].obj->aio_fildes;
 		if (fd == uh->ep_int.fd) {
 			/* interrupt endpoint AIO has completed. This means the IRQ transfer
 			 * which we generated has reached the host */
+			LOGP(DUSB, LOGL_DEBUG, "IRQ AIO completed, free()ing msgb\n");
+			msgb_free(uh->aio_in.msg);
+			uh->aio_in.msg = NULL;
 		} else if (fd == uh->ep_in.fd) {
 			/* IN endpoint AIO has completed. This means the IN transfer which
 			 * we sent to the host has completed */
+			LOGP(DUSB, LOGL_DEBUG, "IN AIO completed, free()ing msgb\n");
 			msgb_free(uh->aio_in.msg);
 			uh->aio_in.msg = NULL;
 		} else if (fd == uh->ep_out.fd) {
-			/* IN endpoint AIO has completed. This means the host has sent us
+			/* OUT endpoint AIO has completed. This means the host has sent us
 			 * some OUT data */
+			LOGP(DUSB, LOGL_DEBUG, "OUT AIO completed, dispatching received msg\n");
 			msgb_put(uh->aio_out.msg, evt[i].res);
-			printf("\t%s\n", msgb_hexdump(uh->aio_out.msg));
+			//printf("\t%s\n", msgb_hexdump(uh->aio_out.msg));
 			//ccid_handle_out(uh->ccid_handle, uh->aio_out.buf, evt[i].res);
 			ccid_handle_out(uh->ccid_handle, uh->aio_out.msg);
 			aio_refill_out(uh);
@@ -304,11 +314,15 @@
 	osmo_fd_setup(&uh->ep0, rc, BSC_FD_READ, &ep_0_cb, uh, 0);
 	osmo_fd_register(&uh->ep0);
 	rc = write(uh->ep0.fd, &descriptors, sizeof(descriptors));
-	if (rc != sizeof(descriptors))
+	if (rc != sizeof(descriptors)) {
+		LOGP(DUSB, LOGL_ERROR, "Cannot write descriptors: %s\n", strerror(errno));
 		return -1;
+	}
 	rc = write(uh->ep0.fd, &strings, sizeof(strings));
-	if (rc != sizeof(strings))
+	if (rc != sizeof(strings)) {
+		LOGP(DUSB, LOGL_ERROR, "Cannot write strings: %s\n", strerror(errno));
 		return -1;
+	}
 
 	/* open other endpoint file descriptors */
 	rc = open("ep1", O_RDWR);
@@ -378,20 +392,52 @@
 	.send_in = ccid_ops_send_in,
 };
 
+static const struct log_info_cat log_info_cat[] = {
+	[DUSB] = {
+		.name = "USB",
+		.description = "USB Transport",
+		.enabled = 1,
+		.loglevel = LOGL_NOTICE,
+	},
+	[DCCID] = {
+		.name = "CCID",
+		.description = "CCID Core",
+		.color = "\033[1;35m",
+		.enabled = 1,
+		.loglevel = LOGL_DEBUG,
+	},
+};
+
+static const struct log_info log_info = {
+	.cat = log_info_cat,
+	.num_cat = ARRAY_SIZE(log_info_cat),
+};
+
+static void *tall_main_ctx;
+
 int main(int argc, char **argv)
 {
 	struct ufunc_handle ufh = (struct ufunc_handle) { 0, };
 	struct ccid_instance ci = (struct ccid_instance) { 0, };
 	int rc;
 
+	tall_main_ctx = talloc_named_const(NULL, 0, "ccid_main_functionfs");
+	msgb_talloc_ctx_init(tall_main_ctx, 0);
+	osmo_init_logging2(tall_main_ctx, &log_info);
+
 	ccid_instance_init(&ci, &c_ops, "", &ufh);
 	ufh.ccid_handle = &ci;
 
+	if (argc < 2) {
+		fprintf(stderr, "You have to specify the mount-path of the functionfs\n");
+		exit(2);
+	}
+
 	chdir(argv[1]);
 	rc = ep0_init(&ufh);
 	if (rc < 0) {
 		fprintf(stderr, "Error %d\n", rc);
-		exit(2);
+		exit(1);
 	}
 
 	while (1) {