1 files changed, 798 insertions, 0 deletions

diff --git a/net/nfc/hci/core.c b/net/nfc/hci/core.c
new file mode 100644
index 000000000000..e1a640d2b588
--- /dev/null
+++ b/net/nfc/hci/core.c
@@ -0,0 +1,798 @@
+/*
+ * Copyright (C) 2012  Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the
+ * Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#define pr_fmt(fmt) "hci: %s: " fmt, __func__
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/nfc.h>
+
+#include <net/nfc/nfc.h>
+#include <net/nfc/hci.h>
+
+#include "hci.h"
+
+/* Largest headroom needed for outgoing HCI commands */
+#define HCI_CMDS_HEADROOM 1
+
+static void nfc_hci_msg_tx_work(struct work_struct *work)
+{
+	struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
+						msg_tx_work);
+	struct hci_msg *msg;
+	struct sk_buff *skb;
+	int r = 0;
+
+	mutex_lock(&hdev->msg_tx_mutex);
+
+	if (hdev->cmd_pending_msg) {
+		if (timer_pending(&hdev->cmd_timer) == 0) {
+			if (hdev->cmd_pending_msg->cb)
+				hdev->cmd_pending_msg->cb(hdev,
+							  NFC_HCI_ANY_E_TIMEOUT,
+							  NULL,
+							  hdev->
+							  cmd_pending_msg->
+							  cb_context);
+			kfree(hdev->cmd_pending_msg);
+			hdev->cmd_pending_msg = NULL;
+		} else
+			goto exit;
+	}
+
+next_msg:
+	if (list_empty(&hdev->msg_tx_queue))
+		goto exit;
+
+	msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
+	list_del(&msg->msg_l);
+
+	pr_debug("msg_tx_queue has a cmd to send\n");
+	while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
+		r = hdev->ops->xmit(hdev, skb);
+		if (r < 0) {
+			kfree_skb(skb);
+			skb_queue_purge(&msg->msg_frags);
+			if (msg->cb)
+				msg->cb(hdev, NFC_HCI_ANY_E_NOK, NULL,
+					msg->cb_context);
+			kfree(msg);
+			break;
+		}
+	}
+
+	if (r)
+		goto next_msg;
+
+	if (msg->wait_response == false) {
+		kfree(msg);
+		goto next_msg;
+	}
+
+	hdev->cmd_pending_msg = msg;
+	mod_timer(&hdev->cmd_timer, jiffies +
+		  msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
+
+exit:
+	mutex_unlock(&hdev->msg_tx_mutex);
+}
+
+static void nfc_hci_msg_rx_work(struct work_struct *work)
+{
+	struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
+						msg_rx_work);
+	struct sk_buff *skb;
+	struct hcp_message *message;
+	u8 pipe;
+	u8 type;
+	u8 instruction;
+
+	while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
+		pipe = skb->data[0];
+		skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
+		message = (struct hcp_message *)skb->data;
+		type = HCP_MSG_GET_TYPE(message->header);
+		instruction = HCP_MSG_GET_CMD(message->header);
+		skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
+
+		nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
+	}
+}
+
+void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
+			   struct sk_buff *skb)
+{
+	mutex_lock(&hdev->msg_tx_mutex);
+
+	if (hdev->cmd_pending_msg == NULL) {
+		kfree_skb(skb);
+		goto exit;
+	}
+
+	del_timer_sync(&hdev->cmd_timer);
+
+	if (hdev->cmd_pending_msg->cb)
+		hdev->cmd_pending_msg->cb(hdev, result, skb,
+					  hdev->cmd_pending_msg->cb_context);
+	else
+		kfree_skb(skb);
+
+	kfree(hdev->cmd_pending_msg);
+	hdev->cmd_pending_msg = NULL;
+
+	queue_work(hdev->msg_tx_wq, &hdev->msg_tx_work);
+
+exit:
+	mutex_unlock(&hdev->msg_tx_mutex);
+}
+
+void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
+			  struct sk_buff *skb)
+{
+	kfree_skb(skb);
+}
+
+static u32 nfc_hci_sak_to_protocol(u8 sak)
+{
+	switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
+	case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
+		return NFC_PROTO_MIFARE_MASK;
+	case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
+		return NFC_PROTO_ISO14443_MASK;
+	case NFC_HCI_TYPE_A_SEL_PROT_DEP:
+		return NFC_PROTO_NFC_DEP_MASK;
+	case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
+		return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
+	default:
+		return 0xffffffff;
+	}
+}
+
+static int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
+{
+	struct nfc_target *targets;
+	struct sk_buff *atqa_skb = NULL;
+	struct sk_buff *sak_skb = NULL;
+	int r;
+
+	pr_debug("from gate %d\n", gate);
+
+	targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
+	if (targets == NULL)
+		return -ENOMEM;
+
+	switch (gate) {
+	case NFC_HCI_RF_READER_A_GATE:
+		r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
+				      NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
+		if (r < 0)
+			goto exit;
+
+		r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
+				      NFC_HCI_RF_READER_A_SAK, &sak_skb);
+		if (r < 0)
+			goto exit;
+
+		if (atqa_skb->len != 2 || sak_skb->len != 1) {
+			r = -EPROTO;
+			goto exit;
+		}
+
+		targets->supported_protocols =
+				nfc_hci_sak_to_protocol(sak_skb->data[0]);
+		if (targets->supported_protocols == 0xffffffff) {
+			r = -EPROTO;
+			goto exit;
+		}
+
+		targets->sens_res = be16_to_cpu(*(u16 *)atqa_skb->data);
+		targets->sel_res = sak_skb->data[0];
+
+		if (hdev->ops->complete_target_discovered) {
+			r = hdev->ops->complete_target_discovered(hdev, gate,
+								  targets);
+			if (r < 0)
+				goto exit;
+		}
+		break;
+	case NFC_HCI_RF_READER_B_GATE:
+		targets->supported_protocols = NFC_PROTO_ISO14443_MASK;
+		break;
+	default:
+		if (hdev->ops->target_from_gate)
+			r = hdev->ops->target_from_gate(hdev, gate, targets);
+		else
+			r = -EPROTO;
+		if (r < 0)
+			goto exit;
+
+		if (hdev->ops->complete_target_discovered) {
+			r = hdev->ops->complete_target_discovered(hdev, gate,
+								  targets);
+			if (r < 0)
+				goto exit;
+		}
+		break;
+	}
+
+	targets->hci_reader_gate = gate;
+
+	r = nfc_targets_found(hdev->ndev, targets, 1);
+
+exit:
+	kfree(targets);
+	kfree_skb(atqa_skb);
+	kfree_skb(sak_skb);
+
+	return r;
+}
+
+void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
+			    struct sk_buff *skb)
+{
+	int r = 0;
+
+	switch (event) {
+	case NFC_HCI_EVT_TARGET_DISCOVERED:
+		if (skb->len < 1) {	/* no status data? */
+			r = -EPROTO;
+			goto exit;
+		}
+
+		if (skb->data[0] == 3) {
+			/* TODO: Multiple targets in field, none activated
+			 * poll is supposedly stopped, but there is no
+			 * single target to activate, so nothing to report
+			 * up.
+			 * if we need to restart poll, we must save the
+			 * protocols from the initial poll and reuse here.
+			 */
+		}
+
+		if (skb->data[0] != 0) {
+			r = -EPROTO;
+			goto exit;
+		}
+
+		r = nfc_hci_target_discovered(hdev,
+					      nfc_hci_pipe2gate(hdev, pipe));
+		break;
+	default:
+		/* TODO: Unknown events are hardware specific
+		 * pass them to the driver (needs a new hci_ops) */
+		break;
+	}
+
+exit:
+	kfree_skb(skb);
+
+	if (r) {
+		/* TODO: There was an error dispatching the event,
+		 * how to propagate up to nfc core?
+		 */
+	}
+}
+
+static void nfc_hci_cmd_timeout(unsigned long data)
+{
+	struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
+
+	queue_work(hdev->msg_tx_wq, &hdev->msg_tx_work);
+}
+
+static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
+				 u8 gates[])
+{
+	int r;
+	u8 *p = gates;
+	while (gate_count--) {
+		r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID, *p);
+		if (r < 0)
+			return r;
+		p++;
+	}
+
+	return 0;
+}
+
+static int hci_dev_session_init(struct nfc_hci_dev *hdev)
+{
+	struct sk_buff *skb = NULL;
+	int r;
+	u8 hci_gates[] = {	/* NFC_HCI_ADMIN_GATE MUST be first */
+		NFC_HCI_ADMIN_GATE, NFC_HCI_LOOPBACK_GATE,
+		NFC_HCI_ID_MGMT_GATE, NFC_HCI_LINK_MGMT_GATE,
+		NFC_HCI_RF_READER_B_GATE, NFC_HCI_RF_READER_A_GATE
+	};
+
+	r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
+				 NFC_HCI_ADMIN_GATE);
+	if (r < 0)
+		goto exit;
+
+	r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
+			      NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
+	if (r < 0)
+		goto disconnect_all;
+
+	if (skb->len && skb->len == strlen(hdev->init_data.session_id))
+		if (memcmp(hdev->init_data.session_id, skb->data,
+			   skb->len) == 0) {
+			/* TODO ELa: restore gate<->pipe table from
+			 * some TBD location.
+			 * note: it doesn't seem possible to get the chip
+			 * currently open gate/pipe table.
+			 * It is only possible to obtain the supported
+			 * gate list.
+			 */
+
+			/* goto exit
+			 * For now, always do a full initialization */
+		}
+
+	r = nfc_hci_disconnect_all_gates(hdev);
+	if (r < 0)
+		goto exit;
+
+	r = hci_dev_connect_gates(hdev, sizeof(hci_gates), hci_gates);
+	if (r < 0)
+		goto disconnect_all;
+
+	r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
+				  hdev->init_data.gates);
+	if (r < 0)
+		goto disconnect_all;
+
+	r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
+			      NFC_HCI_ADMIN_SESSION_IDENTITY,
+			      hdev->init_data.session_id,
+			      strlen(hdev->init_data.session_id));
+	if (r == 0)
+		goto exit;
+
+disconnect_all:
+	nfc_hci_disconnect_all_gates(hdev);
+
+exit:
+	if (skb)
+		kfree_skb(skb);
+
+	return r;
+}
+
+static int hci_dev_version(struct nfc_hci_dev *hdev)
+{
+	int r;
+	struct sk_buff *skb;
+
+	r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
+			      NFC_HCI_ID_MGMT_VERSION_SW, &skb);
+	if (r < 0)
+		return r;
+
+	if (skb->len != 3) {
+		kfree_skb(skb);
+		return -EINVAL;
+	}
+
+	hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
+	hdev->sw_patch = skb->data[0] & 0x0f;
+	hdev->sw_flashlib_major = skb->data[1];
+	hdev->sw_flashlib_minor = skb->data[2];
+
+	kfree_skb(skb);
+
+	r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
+			      NFC_HCI_ID_MGMT_VERSION_HW, &skb);
+	if (r < 0)
+		return r;
+
+	if (skb->len != 3) {
+		kfree_skb(skb);
+		return -EINVAL;
+	}
+
+	hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
+	hdev->hw_version = skb->data[0] & 0x1f;
+	hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
+	hdev->hw_software = skb->data[1] & 0x3f;
+	hdev->hw_bsid = skb->data[2];
+
+	kfree_skb(skb);
+
+	pr_info("SOFTWARE INFO:\n");
+	pr_info("RomLib         : %d\n", hdev->sw_romlib);
+	pr_info("Patch          : %d\n", hdev->sw_patch);
+	pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
+	pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
+	pr_info("HARDWARE INFO:\n");
+	pr_info("Derivative     : %d\n", hdev->hw_derivative);
+	pr_info("HW Version     : %d\n", hdev->hw_version);
+	pr_info("#MPW           : %d\n", hdev->hw_mpw);
+	pr_info("Software       : %d\n", hdev->hw_software);
+	pr_info("BSID Version   : %d\n", hdev->hw_bsid);
+
+	return 0;
+}
+
+static int hci_dev_up(struct nfc_dev *nfc_dev)
+{
+	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
+	int r = 0;
+
+	if (hdev->ops->open) {
+		r = hdev->ops->open(hdev);
+		if (r < 0)
+			return r;
+	}
+
+	r = hci_dev_session_init(hdev);
+	if (r < 0)
+		goto exit;
+
+	r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
+			       NFC_HCI_EVT_END_OPERATION, NULL, 0);
+	if (r < 0)
+		goto exit;
+
+	if (hdev->ops->hci_ready) {
+		r = hdev->ops->hci_ready(hdev);
+		if (r < 0)
+			goto exit;
+	}
+
+	r = hci_dev_version(hdev);
+	if (r < 0)
+		goto exit;
+
+exit:
+	if (r < 0)
+		if (hdev->ops->close)
+			hdev->ops->close(hdev);
+	return r;
+}
+
+static int hci_dev_down(struct nfc_dev *nfc_dev)
+{
+	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
+
+	if (hdev->ops->close)
+		hdev->ops->close(hdev);
+
+	memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
+
+	return 0;
+}
+
+static int hci_start_poll(struct nfc_dev *nfc_dev, u32 protocols)
+{
+	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
+
+	if (hdev->ops->start_poll)
+		return hdev->ops->start_poll(hdev, protocols);
+	else
+		return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
+				       NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
+}
+
+static void hci_stop_poll(struct nfc_dev *nfc_dev)
+{
+	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
+
+	nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
+			   NFC_HCI_EVT_END_OPERATION, NULL, 0);
+}
+
+static int hci_activate_target(struct nfc_dev *nfc_dev,
+			       struct nfc_target *target, u32 protocol)
+{
+	return 0;
+}
+
+static void hci_deactivate_target(struct nfc_dev *nfc_dev,
+				  struct nfc_target *target)
+{
+}
+
+static int hci_data_exchange(struct nfc_dev *nfc_dev, struct nfc_target *target,
+			     struct sk_buff *skb, data_exchange_cb_t cb,
+			     void *cb_context)
+{
+	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
+	int r;
+	struct sk_buff *res_skb = NULL;
+
+	pr_debug("target_idx=%d\n", target->idx);
+
+	switch (target->hci_reader_gate) {
+	case NFC_HCI_RF_READER_A_GATE:
+	case NFC_HCI_RF_READER_B_GATE:
+		if (hdev->ops->data_exchange) {
+			r = hdev->ops->data_exchange(hdev, target, skb,
+						     &res_skb);
+			if (r <= 0)	/* handled */
+				break;
+		}
+
+		*skb_push(skb, 1) = 0;	/* CTR, see spec:10.2.2.1 */
+		r = nfc_hci_send_cmd(hdev, target->hci_reader_gate,
+				     NFC_HCI_WR_XCHG_DATA,
+				     skb->data, skb->len, &res_skb);
+		/*
+		 * TODO: Check RF Error indicator to make sure data is valid.
+		 * It seems that HCI cmd can complete without error, but data
+		 * can be invalid if an RF error occured? Ignore for now.
+		 */
+		if (r == 0)
+			skb_trim(res_skb, res_skb->len - 1); /* RF Err ind */
+		break;
+	default:
+		if (hdev->ops->data_exchange) {
+			r = hdev->ops->data_exchange(hdev, target, skb,
+						     &res_skb);
+			if (r == 1)
+				r = -ENOTSUPP;
+		}
+		else
+			r = -ENOTSUPP;
+	}
+
+	kfree_skb(skb);
+
+	cb(cb_context, res_skb, r);
+
+	return 0;
+}
+
+static int hci_check_presence(struct nfc_dev *nfc_dev,
+			      struct nfc_target *target)
+{
+	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
+
+	if (hdev->ops->check_presence)
+		return hdev->ops->check_presence(hdev, target);
+
+	return 0;
+}
+
+static struct nfc_ops hci_nfc_ops = {
+	.dev_up = hci_dev_up,
+	.dev_down = hci_dev_down,
+	.start_poll = hci_start_poll,
+	.stop_poll = hci_stop_poll,
+	.activate_target = hci_activate_target,
+	.deactivate_target = hci_deactivate_target,
+	.data_exchange = hci_data_exchange,
+	.check_presence = hci_check_presence,
+};
+
+struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
+					    struct nfc_hci_init_data *init_data,
+					    u32 protocols,
+					    int tx_headroom,
+					    int tx_tailroom,
+					    int max_link_payload)
+{
+	struct nfc_hci_dev *hdev;
+
+	if (ops->xmit == NULL)
+		return NULL;
+
+	if (protocols == 0)
+		return NULL;
+
+	hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
+	if (hdev == NULL)
+		return NULL;
+
+	hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
+					 tx_headroom + HCI_CMDS_HEADROOM,
+					 tx_tailroom);
+	if (!hdev->ndev) {
+		kfree(hdev);
+		return NULL;
+	}
+
+	hdev->ops = ops;
+	hdev->max_data_link_payload = max_link_payload;
+	hdev->init_data = *init_data;
+
+	nfc_set_drvdata(hdev->ndev, hdev);
+
+	memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
+
+	return hdev;
+}
+EXPORT_SYMBOL(nfc_hci_allocate_device);
+
+void nfc_hci_free_device(struct nfc_hci_dev *hdev)
+{
+	nfc_free_device(hdev->ndev);
+	kfree(hdev);
+}
+EXPORT_SYMBOL(nfc_hci_free_device);
+
+int nfc_hci_register_device(struct nfc_hci_dev *hdev)
+{
+	struct device *dev = &hdev->ndev->dev;
+	const char *devname = dev_name(dev);
+	char name[32];
+	int r = 0;
+
+	mutex_init(&hdev->msg_tx_mutex);
+
+	INIT_LIST_HEAD(&hdev->msg_tx_queue);
+
+	INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
+	snprintf(name, sizeof(name), "%s_hci_msg_tx_wq", devname);
+	hdev->msg_tx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND |
+					  WQ_MEM_RECLAIM, 1);
+	if (hdev->msg_tx_wq == NULL) {
+		r = -ENOMEM;
+		goto exit;
+	}
+
+	init_timer(&hdev->cmd_timer);
+	hdev->cmd_timer.data = (unsigned long)hdev;
+	hdev->cmd_timer.function = nfc_hci_cmd_timeout;
+
+	skb_queue_head_init(&hdev->rx_hcp_frags);
+
+	INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
+	snprintf(name, sizeof(name), "%s_hci_msg_rx_wq", devname);
+	hdev->msg_rx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND |
+					  WQ_MEM_RECLAIM, 1);
+	if (hdev->msg_rx_wq == NULL) {
+		r = -ENOMEM;
+		goto exit;
+	}
+
+	skb_queue_head_init(&hdev->msg_rx_queue);
+
+	r = nfc_register_device(hdev->ndev);
+
+exit:
+	if (r < 0) {
+		if (hdev->msg_tx_wq)
+			destroy_workqueue(hdev->msg_tx_wq);
+		if (hdev->msg_rx_wq)
+			destroy_workqueue(hdev->msg_rx_wq);
+	}
+
+	return r;
+}
+EXPORT_SYMBOL(nfc_hci_register_device);
+
+void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
+{
+	struct hci_msg *msg;
+
+	skb_queue_purge(&hdev->rx_hcp_frags);
+	skb_queue_purge(&hdev->msg_rx_queue);
+
+	while ((msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg,
+				       msg_l)) != NULL) {
+		list_del(&msg->msg_l);
+		skb_queue_purge(&msg->msg_frags);
+		kfree(msg);
+	}
+
+	del_timer_sync(&hdev->cmd_timer);
+
+	nfc_unregister_device(hdev->ndev);
+
+	destroy_workqueue(hdev->msg_tx_wq);
+
+	destroy_workqueue(hdev->msg_rx_wq);
+}
+EXPORT_SYMBOL(nfc_hci_unregister_device);
+
+void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
+{
+	hdev->clientdata = clientdata;
+}
+EXPORT_SYMBOL(nfc_hci_set_clientdata);
+
+void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
+{
+	return hdev->clientdata;
+}
+EXPORT_SYMBOL(nfc_hci_get_clientdata);
+
+void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
+{
+	struct hcp_packet *packet;
+	u8 type;
+	u8 instruction;
+	struct sk_buff *hcp_skb;
+	u8 pipe;
+	struct sk_buff *frag_skb;
+	int msg_len;
+
+	if (skb == NULL) {
+		/* TODO ELa: lower layer had permanent failure, need to
+		 * propagate that up
+		 */
+
+		skb_queue_purge(&hdev->rx_hcp_frags);
+
+		return;
+	}
+
+	packet = (struct hcp_packet *)skb->data;
+	if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
+		skb_queue_tail(&hdev->rx_hcp_frags, skb);
+		return;
+	}
+
+	/* it's the last fragment. Does it need re-aggregation? */
+	if (skb_queue_len(&hdev->rx_hcp_frags)) {
+		pipe = packet->header & NFC_HCI_FRAGMENT;
+		skb_queue_tail(&hdev->rx_hcp_frags, skb);
+
+		msg_len = 0;
+		skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
+			msg_len += (frag_skb->len -
+				    NFC_HCI_HCP_PACKET_HEADER_LEN);
+		}
+
+		hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
+					     msg_len, GFP_KERNEL);
+		if (hcp_skb == NULL) {
+			/* TODO ELa: cannot deliver HCP message. How to
+			 * propagate error up?
+			 */
+		}
+
+		*skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
+
+		skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
+			msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
+			memcpy(skb_put(hcp_skb, msg_len),
+			       frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
+			       msg_len);
+		}
+
+		skb_queue_purge(&hdev->rx_hcp_frags);
+	} else {
+		packet->header &= NFC_HCI_FRAGMENT;
+		hcp_skb = skb;
+	}
+
+	/* if this is a response, dispatch immediately to
+	 * unblock waiting cmd context. Otherwise, enqueue to dispatch
+	 * in separate context where handler can also execute command.
+	 */
+	packet = (struct hcp_packet *)hcp_skb->data;
+	type = HCP_MSG_GET_TYPE(packet->message.header);
+	if (type == NFC_HCI_HCP_RESPONSE) {
+		pipe = packet->header;
+		instruction = HCP_MSG_GET_CMD(packet->message.header);
+		skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
+			 NFC_HCI_HCP_MESSAGE_HEADER_LEN);
+		nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
+	} else {
+		skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
+		queue_work(hdev->msg_rx_wq, &hdev->msg_rx_work);
+	}
+}
+EXPORT_SYMBOL(nfc_hci_recv_frame);
+
+MODULE_LICENSE("GPL");