NFC: st21nfca: Align st21nfca driver with other nfc driver

Align st21nfca driver with or nfc driver:
- Remove st21nfca_ prefix
- Merge st21nfca_se.h, st21nfca_dep.h in st21nfca.h

Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 1062 insertions, 0 deletions

diff --git a/drivers/nfc/st21nfca/core.c b/drivers/nfc/st21nfca/core.c
new file mode 100644
index 000000000000..42f197407a00
--- /dev/null
+++ b/drivers/nfc/st21nfca/core.c
@@ -0,0 +1,1062 @@
+/*
+ * HCI based Driver for STMicroelectronics NFC Chip
+ *
+ * Copyright (C) 2014  STMicroelectronics SAS. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/nfc.h>
+#include <net/nfc/hci.h>
+#include <net/nfc/llc.h>
+
+#include "st21nfca.h"
+
+#define DRIVER_DESC "HCI NFC driver for ST21NFCA"
+
+#define FULL_VERSION_LEN 3
+
+/* Proprietary gates, events, commands and registers */
+
+/* Commands that apply to all RF readers */
+#define ST21NFCA_RF_READER_CMD_PRESENCE_CHECK	0x30
+
+#define ST21NFCA_RF_READER_ISO15693_GATE	0x12
+#define ST21NFCA_RF_READER_ISO15693_INVENTORY	0x01
+
+/*
+ * Reader gate for communication with contact-less cards using Type A
+ * protocol ISO14443-3 but not compliant with ISO14443-4
+ */
+#define ST21NFCA_RF_READER_14443_3_A_GATE	0x15
+#define ST21NFCA_RF_READER_14443_3_A_UID	0x02
+#define ST21NFCA_RF_READER_14443_3_A_ATQA	0x03
+#define ST21NFCA_RF_READER_14443_3_A_SAK	0x04
+
+#define ST21NFCA_RF_READER_F_DATARATE		0x01
+#define ST21NFCA_RF_READER_F_DATARATE_106	0x01
+#define ST21NFCA_RF_READER_F_DATARATE_212	0x02
+#define ST21NFCA_RF_READER_F_DATARATE_424	0x04
+#define ST21NFCA_RF_READER_F_POL_REQ		0x02
+#define ST21NFCA_RF_READER_F_POL_REQ_DEFAULT	0xffff0000
+#define ST21NFCA_RF_READER_F_NFCID2		0x03
+#define ST21NFCA_RF_READER_F_NFCID1		0x04
+
+#define ST21NFCA_RF_CARD_F_MODE			0x01
+#define ST21NFCA_RF_CARD_F_NFCID2_LIST		0x04
+#define ST21NFCA_RF_CARD_F_NFCID1		0x05
+#define ST21NFCA_RF_CARD_F_SENS_RES		0x06
+#define ST21NFCA_RF_CARD_F_SEL_RES		0x07
+#define ST21NFCA_RF_CARD_F_DATARATE		0x08
+#define ST21NFCA_RF_CARD_F_DATARATE_212_424	0x01
+
+#define ST21NFCA_DEVICE_MGNT_PIPE		0x02
+
+#define ST21NFCA_DM_GETINFO			0x13
+#define ST21NFCA_DM_GETINFO_PIPE_LIST		0x02
+#define ST21NFCA_DM_GETINFO_PIPE_INFO		0x01
+#define ST21NFCA_DM_PIPE_CREATED		0x02
+#define ST21NFCA_DM_PIPE_OPEN			0x04
+#define ST21NFCA_DM_RF_ACTIVE			0x80
+#define ST21NFCA_DM_DISCONNECT			0x30
+
+#define ST21NFCA_DM_IS_PIPE_OPEN(p) \
+	((p & 0x0f) == (ST21NFCA_DM_PIPE_CREATED | ST21NFCA_DM_PIPE_OPEN))
+
+#define ST21NFCA_NFC_MODE			0x03	/* NFC_MODE parameter*/
+
+#define ST21NFCA_EVT_HOT_PLUG			0x03
+#define ST21NFCA_EVT_HOT_PLUG_IS_INHIBITED(x) (x->data[0] & 0x80)
+
+#define ST21NFCA_SE_TO_PIPES			2000
+
+static DECLARE_BITMAP(dev_mask, ST21NFCA_NUM_DEVICES);
+
+static struct nfc_hci_gate st21nfca_gates[] = {
+	{NFC_HCI_ADMIN_GATE, NFC_HCI_ADMIN_PIPE},
+	{NFC_HCI_LOOPBACK_GATE, NFC_HCI_INVALID_PIPE},
+	{NFC_HCI_ID_MGMT_GATE, NFC_HCI_INVALID_PIPE},
+	{NFC_HCI_LINK_MGMT_GATE, NFC_HCI_LINK_MGMT_PIPE},
+	{NFC_HCI_RF_READER_B_GATE, NFC_HCI_INVALID_PIPE},
+	{NFC_HCI_RF_READER_A_GATE, NFC_HCI_INVALID_PIPE},
+	{ST21NFCA_DEVICE_MGNT_GATE, ST21NFCA_DEVICE_MGNT_PIPE},
+	{ST21NFCA_RF_READER_F_GATE, NFC_HCI_INVALID_PIPE},
+	{ST21NFCA_RF_READER_14443_3_A_GATE, NFC_HCI_INVALID_PIPE},
+	{ST21NFCA_RF_READER_ISO15693_GATE, NFC_HCI_INVALID_PIPE},
+	{ST21NFCA_RF_CARD_F_GATE, NFC_HCI_INVALID_PIPE},
+
+	/* Secure element pipes are created by secure element host */
+	{ST21NFCA_CONNECTIVITY_GATE, NFC_HCI_DO_NOT_CREATE_PIPE},
+	{ST21NFCA_APDU_READER_GATE, NFC_HCI_DO_NOT_CREATE_PIPE},
+};
+
+struct st21nfca_pipe_info {
+	u8 pipe_state;
+	u8 src_host_id;
+	u8 src_gate_id;
+	u8 dst_host_id;
+	u8 dst_gate_id;
+} __packed;
+
+/* Largest headroom needed for outgoing custom commands */
+#define ST21NFCA_CMDS_HEADROOM  7
+
+static int st21nfca_hci_load_session(struct nfc_hci_dev *hdev)
+{
+	int i, j, r;
+	struct sk_buff *skb_pipe_list, *skb_pipe_info;
+	struct st21nfca_pipe_info *info;
+
+	u8 pipe_list[] = { ST21NFCA_DM_GETINFO_PIPE_LIST,
+		NFC_HCI_TERMINAL_HOST_ID
+	};
+	u8 pipe_info[] = { ST21NFCA_DM_GETINFO_PIPE_INFO,
+		NFC_HCI_TERMINAL_HOST_ID, 0
+	};
+
+	/* On ST21NFCA device pipes number are dynamics
+	 * A maximum of 16 pipes can be created at the same time
+	 * If pipes are already created, hci_dev_up will fail.
+	 * Doing a clear all pipe is a bad idea because:
+	 * - It does useless EEPROM cycling
+	 * - It might cause issue for secure elements support
+	 * (such as removing connectivity or APDU reader pipe)
+	 * A better approach on ST21NFCA is to:
+	 * - get a pipe list for each host.
+	 * (eg: NFC_HCI_HOST_CONTROLLER_ID for now).
+	 * (TODO Later on UICC HOST and eSE HOST)
+	 * - get pipe information
+	 * - match retrieved pipe list in st21nfca_gates
+	 * ST21NFCA_DEVICE_MGNT_GATE is a proprietary gate
+	 * with ST21NFCA_DEVICE_MGNT_PIPE.
+	 * Pipe can be closed and need to be open.
+	 */
+	r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
+				ST21NFCA_DEVICE_MGNT_GATE,
+				ST21NFCA_DEVICE_MGNT_PIPE);
+	if (r < 0)
+		return r;
+
+	/* Get pipe list */
+	r = nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
+			ST21NFCA_DM_GETINFO, pipe_list, sizeof(pipe_list),
+			&skb_pipe_list);
+	if (r < 0)
+		return r;
+
+	/* Complete the existing gate_pipe table */
+	for (i = 0; i < skb_pipe_list->len; i++) {
+		pipe_info[2] = skb_pipe_list->data[i];
+		r = nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
+					ST21NFCA_DM_GETINFO, pipe_info,
+					sizeof(pipe_info), &skb_pipe_info);
+
+		if (r)
+			continue;
+
+		/*
+		 * Match pipe ID and gate ID
+		 * Output format from ST21NFC_DM_GETINFO is:
+		 * - pipe state (1byte)
+		 * - source hid (1byte)
+		 * - source gid (1byte)
+		 * - destination hid (1byte)
+		 * - destination gid (1byte)
+		 */
+		info = (struct st21nfca_pipe_info *) skb_pipe_info->data;
+		if (info->dst_gate_id == ST21NFCA_APDU_READER_GATE &&
+			info->src_host_id != ST21NFCA_ESE_HOST_ID) {
+			pr_err("Unexpected apdu_reader pipe on host %x\n",
+				info->src_host_id);
+			kfree_skb(skb_pipe_info);
+			continue;
+		}
+
+		for (j = 0; (j < ARRAY_SIZE(st21nfca_gates)) &&
+			(st21nfca_gates[j].gate != info->dst_gate_id) ; j++)
+			;
+
+		if (j < ARRAY_SIZE(st21nfca_gates) &&
+			st21nfca_gates[j].gate == info->dst_gate_id &&
+			ST21NFCA_DM_IS_PIPE_OPEN(info->pipe_state)) {
+			st21nfca_gates[j].pipe = pipe_info[2];
+
+			hdev->gate2pipe[st21nfca_gates[j].gate] =
+							st21nfca_gates[j].pipe;
+			hdev->pipes[st21nfca_gates[j].pipe].gate =
+							st21nfca_gates[j].gate;
+			hdev->pipes[st21nfca_gates[j].pipe].dest_host =
+							info->src_host_id;
+		}
+		kfree_skb(skb_pipe_info);
+	}
+
+	/*
+	 * 3 gates have a well known pipe ID.
+	 * They will never appear in the pipe list
+	 */
+	if (skb_pipe_list->len + 3 < ARRAY_SIZE(st21nfca_gates)) {
+		for (i = skb_pipe_list->len + 3;
+				i < ARRAY_SIZE(st21nfca_gates) - 2; i++) {
+			r = nfc_hci_connect_gate(hdev,
+					NFC_HCI_HOST_CONTROLLER_ID,
+					st21nfca_gates[i].gate,
+					st21nfca_gates[i].pipe);
+			if (r < 0)
+				goto free_list;
+		}
+	}
+
+	memcpy(hdev->init_data.gates, st21nfca_gates, sizeof(st21nfca_gates));
+free_list:
+	kfree_skb(skb_pipe_list);
+	return r;
+}
+
+static int st21nfca_hci_open(struct nfc_hci_dev *hdev)
+{
+	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
+	int r;
+
+	mutex_lock(&info->info_lock);
+
+	if (info->state != ST21NFCA_ST_COLD) {
+		r = -EBUSY;
+		goto out;
+	}
+
+	r = info->phy_ops->enable(info->phy_id);
+
+	if (r == 0)
+		info->state = ST21NFCA_ST_READY;
+
+out:
+	mutex_unlock(&info->info_lock);
+	return r;
+}
+
+static void st21nfca_hci_close(struct nfc_hci_dev *hdev)
+{
+	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
+
+	mutex_lock(&info->info_lock);
+
+	if (info->state == ST21NFCA_ST_COLD)
+		goto out;
+
+	info->phy_ops->disable(info->phy_id);
+	info->state = ST21NFCA_ST_COLD;
+
+out:
+	mutex_unlock(&info->info_lock);
+}
+
+static int st21nfca_hci_ready(struct nfc_hci_dev *hdev)
+{
+	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
+	struct sk_buff *skb;
+
+	u8 param;
+	u8 white_list[2];
+	int wl_size = 0;
+	int r;
+
+	if (info->se_status->is_ese_present &&
+		info->se_status->is_uicc_present) {
+		white_list[wl_size++] = NFC_HCI_UICC_HOST_ID;
+		white_list[wl_size++] = ST21NFCA_ESE_HOST_ID;
+	} else if (!info->se_status->is_ese_present &&
+			 info->se_status->is_uicc_present) {
+		white_list[wl_size++] = NFC_HCI_UICC_HOST_ID;
+	} else if (info->se_status->is_ese_present &&
+			!info->se_status->is_uicc_present) {
+		white_list[wl_size++] = ST21NFCA_ESE_HOST_ID;
+	}
+
+	if (wl_size) {
+		r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
+					NFC_HCI_ADMIN_WHITELIST,
+					(u8 *) &white_list, wl_size);
+		if (r < 0)
+			return r;
+	}
+
+	/* Set NFC_MODE in device management gate to enable */
+	r = nfc_hci_get_param(hdev, ST21NFCA_DEVICE_MGNT_GATE,
+			      ST21NFCA_NFC_MODE, &skb);
+	if (r < 0)
+		return r;
+
+	param = skb->data[0];
+	kfree_skb(skb);
+	if (param == 0) {
+		param = 1;
+
+		r = nfc_hci_set_param(hdev, ST21NFCA_DEVICE_MGNT_GATE,
+					ST21NFCA_NFC_MODE, &param, 1);
+		if (r < 0)
+			return r;
+	}
+
+	r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
+			       NFC_HCI_EVT_END_OPERATION, NULL, 0);
+	if (r < 0)
+		return r;
+
+	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 != FULL_VERSION_LEN) {
+		kfree_skb(skb);
+		return -EINVAL;
+	}
+
+	print_hex_dump(KERN_DEBUG, "FULL VERSION SOFTWARE INFO: ",
+		       DUMP_PREFIX_NONE, 16, 1,
+		       skb->data, FULL_VERSION_LEN, false);
+
+	kfree_skb(skb);
+
+	return 0;
+}
+
+static int st21nfca_hci_xmit(struct nfc_hci_dev *hdev, struct sk_buff *skb)
+{
+	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
+
+	return info->phy_ops->write(info->phy_id, skb);
+}
+
+static int st21nfca_hci_start_poll(struct nfc_hci_dev *hdev,
+				   u32 im_protocols, u32 tm_protocols)
+{
+	int r;
+	u32 pol_req;
+	u8 param[19];
+	struct sk_buff *datarate_skb;
+
+	pr_info(DRIVER_DESC ": %s protocols 0x%x 0x%x\n",
+		__func__, im_protocols, tm_protocols);
+
+	r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
+			       NFC_HCI_EVT_END_OPERATION, NULL, 0);
+	if (r < 0)
+		return r;
+	if (im_protocols) {
+		/*
+		 * enable polling according to im_protocols & tm_protocols
+		 * - CLOSE pipe according to im_protocols & tm_protocols
+		 */
+		if ((NFC_HCI_RF_READER_B_GATE & im_protocols) == 0) {
+			r = nfc_hci_disconnect_gate(hdev,
+					NFC_HCI_RF_READER_B_GATE);
+			if (r < 0)
+				return r;
+		}
+
+		if ((NFC_HCI_RF_READER_A_GATE & im_protocols) == 0) {
+			r = nfc_hci_disconnect_gate(hdev,
+					NFC_HCI_RF_READER_A_GATE);
+			if (r < 0)
+				return r;
+		}
+
+		if ((ST21NFCA_RF_READER_F_GATE & im_protocols) == 0) {
+			r = nfc_hci_disconnect_gate(hdev,
+					ST21NFCA_RF_READER_F_GATE);
+			if (r < 0)
+				return r;
+		} else {
+			hdev->gb = nfc_get_local_general_bytes(hdev->ndev,
+							       &hdev->gb_len);
+
+			if (hdev->gb == NULL || hdev->gb_len == 0) {
+				im_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
+				tm_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
+			}
+
+			param[0] = ST21NFCA_RF_READER_F_DATARATE_106 |
+			    ST21NFCA_RF_READER_F_DATARATE_212 |
+			    ST21NFCA_RF_READER_F_DATARATE_424;
+			r = nfc_hci_set_param(hdev, ST21NFCA_RF_READER_F_GATE,
+					      ST21NFCA_RF_READER_F_DATARATE,
+					      param, 1);
+			if (r < 0)
+				return r;
+
+			pol_req = be32_to_cpu((__force __be32)
+					ST21NFCA_RF_READER_F_POL_REQ_DEFAULT);
+			r = nfc_hci_set_param(hdev, ST21NFCA_RF_READER_F_GATE,
+					      ST21NFCA_RF_READER_F_POL_REQ,
+					      (u8 *) &pol_req, 4);
+			if (r < 0)
+				return r;
+		}
+
+		if ((ST21NFCA_RF_READER_14443_3_A_GATE & im_protocols) == 0) {
+			r = nfc_hci_disconnect_gate(hdev,
+					ST21NFCA_RF_READER_14443_3_A_GATE);
+			if (r < 0)
+				return r;
+		}
+
+		if ((ST21NFCA_RF_READER_ISO15693_GATE & im_protocols) == 0) {
+			r = nfc_hci_disconnect_gate(hdev,
+					ST21NFCA_RF_READER_ISO15693_GATE);
+			if (r < 0)
+				return r;
+		}
+
+		r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
+				       NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
+		if (r < 0)
+			nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
+					   NFC_HCI_EVT_END_OPERATION, NULL, 0);
+	}
+
+	if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
+		r = nfc_hci_get_param(hdev, ST21NFCA_RF_CARD_F_GATE,
+				      ST21NFCA_RF_CARD_F_DATARATE,
+				      &datarate_skb);
+		if (r < 0)
+			return r;
+
+		/* Configure the maximum supported datarate to 424Kbps */
+		if (datarate_skb->len > 0 &&
+		    datarate_skb->data[0] !=
+		    ST21NFCA_RF_CARD_F_DATARATE_212_424) {
+			param[0] = ST21NFCA_RF_CARD_F_DATARATE_212_424;
+			r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
+					      ST21NFCA_RF_CARD_F_DATARATE,
+					      param, 1);
+			if (r < 0) {
+				kfree_skb(datarate_skb);
+				return r;
+			}
+		}
+		kfree_skb(datarate_skb);
+
+		/*
+		 * Configure sens_res
+		 *
+		 * NFC Forum Digital Spec Table 7:
+		 * NFCID1 size: triple (10 bytes)
+		 */
+		param[0] = 0x00;
+		param[1] = 0x08;
+		r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
+				      ST21NFCA_RF_CARD_F_SENS_RES, param, 2);
+		if (r < 0)
+			return r;
+
+		/*
+		 * Configure sel_res
+		 *
+		 * NFC Forum Digistal Spec Table 17:
+		 * b3 set to 0b (value b7-b6):
+		 * - 10b: Configured for NFC-DEP Protocol
+		 */
+		param[0] = 0x40;
+		r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
+				      ST21NFCA_RF_CARD_F_SEL_RES, param, 1);
+		if (r < 0)
+			return r;
+
+		/* Configure NFCID1 Random uid */
+		r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
+				      ST21NFCA_RF_CARD_F_NFCID1, NULL, 0);
+		if (r < 0)
+			return r;
+
+		/* Configure NFCID2_LIST */
+		/* System Code */
+		param[0] = 0x00;
+		param[1] = 0x00;
+		/* NFCID2 */
+		param[2] = 0x01;
+		param[3] = 0xfe;
+		param[4] = 'S';
+		param[5] = 'T';
+		param[6] = 'M';
+		param[7] = 'i';
+		param[8] = 'c';
+		param[9] = 'r';
+		/* 8 byte Pad bytes used for polling respone frame */
+
+		/*
+		 * Configuration byte:
+		 * - bit 0: define the default NFCID2 entry used when the
+		 * system code is equal to 'FFFF'
+		 * - bit 1: use a random value for lowest 6 bytes of
+		 * NFCID2 value
+		 * - bit 2: ignore polling request frame if request code
+		 * is equal to '01'
+		 * - Other bits are RFU
+		 */
+		param[18] = 0x01;
+		r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
+				      ST21NFCA_RF_CARD_F_NFCID2_LIST, param,
+				      19);
+		if (r < 0)
+			return r;
+
+		param[0] = 0x02;
+		r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
+				      ST21NFCA_RF_CARD_F_MODE, param, 1);
+	}
+
+	return r;
+}
+
+static void st21nfca_hci_stop_poll(struct nfc_hci_dev *hdev)
+{
+	nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
+			ST21NFCA_DM_DISCONNECT, NULL, 0, NULL);
+}
+
+static int st21nfca_get_iso14443_3_atqa(struct nfc_hci_dev *hdev, u16 *atqa)
+{
+	int r;
+	struct sk_buff *atqa_skb = NULL;
+
+	r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_14443_3_A_GATE,
+			      ST21NFCA_RF_READER_14443_3_A_ATQA, &atqa_skb);
+	if (r < 0)
+		goto exit;
+
+	if (atqa_skb->len != 2) {
+		r = -EPROTO;
+		goto exit;
+	}
+
+	*atqa = be16_to_cpu(*(__be16 *) atqa_skb->data);
+
+exit:
+	kfree_skb(atqa_skb);
+	return r;
+}
+
+static int st21nfca_get_iso14443_3_sak(struct nfc_hci_dev *hdev, u8 *sak)
+{
+	int r;
+	struct sk_buff *sak_skb = NULL;
+
+	r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_14443_3_A_GATE,
+			      ST21NFCA_RF_READER_14443_3_A_SAK, &sak_skb);
+	if (r < 0)
+		goto exit;
+
+	if (sak_skb->len != 1) {
+		r = -EPROTO;
+		goto exit;
+	}
+
+	*sak = sak_skb->data[0];
+
+exit:
+	kfree_skb(sak_skb);
+	return r;
+}
+
+static int st21nfca_get_iso14443_3_uid(struct nfc_hci_dev *hdev, u8 *uid,
+				       int *len)
+{
+	int r;
+	struct sk_buff *uid_skb = NULL;
+
+	r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_14443_3_A_GATE,
+			      ST21NFCA_RF_READER_14443_3_A_UID, &uid_skb);
+	if (r < 0)
+		goto exit;
+
+	if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
+		r = -EPROTO;
+		goto exit;
+	}
+
+	memcpy(uid, uid_skb->data, uid_skb->len);
+	*len = uid_skb->len;
+exit:
+	kfree_skb(uid_skb);
+	return r;
+}
+
+static int st21nfca_get_iso15693_inventory(struct nfc_hci_dev *hdev,
+					   struct nfc_target *target)
+{
+	int r;
+	struct sk_buff *inventory_skb = NULL;
+
+	r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_ISO15693_GATE,
+			      ST21NFCA_RF_READER_ISO15693_INVENTORY,
+			      &inventory_skb);
+	if (r < 0)
+		goto exit;
+
+	skb_pull(inventory_skb, 2);
+
+	if (inventory_skb->len == 0 ||
+	    inventory_skb->len > NFC_ISO15693_UID_MAXSIZE) {
+		r = -EPROTO;
+		goto exit;
+	}
+
+	memcpy(target->iso15693_uid, inventory_skb->data, inventory_skb->len);
+	target->iso15693_dsfid	= inventory_skb->data[1];
+	target->is_iso15693 = 1;
+exit:
+	kfree_skb(inventory_skb);
+	return r;
+}
+
+static int st21nfca_hci_dep_link_up(struct nfc_hci_dev *hdev,
+				    struct nfc_target *target, u8 comm_mode,
+				    u8 *gb, size_t gb_len)
+{
+	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
+
+	info->dep_info.idx = target->idx;
+	return st21nfca_im_send_atr_req(hdev, gb, gb_len);
+}
+
+static int st21nfca_hci_dep_link_down(struct nfc_hci_dev *hdev)
+{
+	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
+
+	info->state = ST21NFCA_ST_READY;
+
+	return nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
+				ST21NFCA_DM_DISCONNECT, NULL, 0, NULL);
+}
+
+static int st21nfca_hci_target_from_gate(struct nfc_hci_dev *hdev, u8 gate,
+					 struct nfc_target *target)
+{
+	int r, len;
+	u16 atqa;
+	u8 sak;
+	u8 uid[NFC_NFCID1_MAXSIZE];
+
+	switch (gate) {
+	case ST21NFCA_RF_READER_F_GATE:
+		target->supported_protocols = NFC_PROTO_FELICA_MASK;
+		break;
+	case ST21NFCA_RF_READER_14443_3_A_GATE:
+		/* ISO14443-3 type 1 or 2 tags */
+		r = st21nfca_get_iso14443_3_atqa(hdev, &atqa);
+		if (r < 0)
+			return r;
+		if (atqa == 0x000c) {
+			target->supported_protocols = NFC_PROTO_JEWEL_MASK;
+			target->sens_res = 0x0c00;
+		} else {
+			r = st21nfca_get_iso14443_3_sak(hdev, &sak);
+			if (r < 0)
+				return r;
+
+			r = st21nfca_get_iso14443_3_uid(hdev, uid, &len);
+			if (r < 0)
+				return r;
+
+			target->supported_protocols =
+			    nfc_hci_sak_to_protocol(sak);
+			if (target->supported_protocols == 0xffffffff)
+				return -EPROTO;
+
+			target->sens_res = atqa;
+			target->sel_res = sak;
+			memcpy(target->nfcid1, uid, len);
+			target->nfcid1_len = len;
+		}
+
+		break;
+	case ST21NFCA_RF_READER_ISO15693_GATE:
+		target->supported_protocols = NFC_PROTO_ISO15693_MASK;
+		r = st21nfca_get_iso15693_inventory(hdev, target);
+		if (r < 0)
+			return r;
+		break;
+	default:
+		return -EPROTO;
+	}
+
+	return 0;
+}
+
+static int st21nfca_hci_complete_target_discovered(struct nfc_hci_dev *hdev,
+						u8 gate,
+						struct nfc_target *target)
+{
+	int r;
+	struct sk_buff *nfcid_skb = NULL;
+
+	if (gate == ST21NFCA_RF_READER_F_GATE) {
+		r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_F_GATE,
+				ST21NFCA_RF_READER_F_NFCID2, &nfcid_skb);
+		if (r < 0)
+			goto exit;
+
+		if (nfcid_skb->len > NFC_SENSF_RES_MAXSIZE) {
+			r = -EPROTO;
+			goto exit;
+		}
+
+		/*
+		 * - After the recepton of polling response for type F frame
+		 * at 212 or 424 Kbit/s, NFCID2 registry parameters will be
+		 * updated.
+		 * - After the reception of SEL_RES with NFCIP-1 compliant bit
+		 * set for type A frame NFCID1 will be updated
+		 */
+		if (nfcid_skb->len > 0) {
+			/* P2P in type F */
+			memcpy(target->sensf_res, nfcid_skb->data,
+				nfcid_skb->len);
+			target->sensf_res_len = nfcid_skb->len;
+			/* NFC Forum Digital Protocol Table 44 */
+			if (target->sensf_res[0] == 0x01 &&
+			    target->sensf_res[1] == 0xfe)
+				target->supported_protocols =
+							NFC_PROTO_NFC_DEP_MASK;
+			else
+				target->supported_protocols =
+							NFC_PROTO_FELICA_MASK;
+		} else {
+			kfree_skb(nfcid_skb);
+			/* P2P in type A */
+			r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_F_GATE,
+					ST21NFCA_RF_READER_F_NFCID1,
+					&nfcid_skb);
+			if (r < 0)
+				goto exit;
+
+			if (nfcid_skb->len > NFC_NFCID1_MAXSIZE) {
+				r = -EPROTO;
+				goto exit;
+			}
+			memcpy(target->sensf_res, nfcid_skb->data,
+				nfcid_skb->len);
+			target->sensf_res_len = nfcid_skb->len;
+			target->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
+		}
+		target->hci_reader_gate = ST21NFCA_RF_READER_F_GATE;
+	}
+	r = 1;
+exit:
+	kfree_skb(nfcid_skb);
+	return r;
+}
+
+#define ST21NFCA_CB_TYPE_READER_ISO15693 1
+static void st21nfca_hci_data_exchange_cb(void *context, struct sk_buff *skb,
+					  int err)
+{
+	struct st21nfca_hci_info *info = context;
+
+	switch (info->async_cb_type) {
+	case ST21NFCA_CB_TYPE_READER_ISO15693:
+		if (err == 0)
+			skb_trim(skb, skb->len - 1);
+		info->async_cb(info->async_cb_context, skb, err);
+		break;
+	default:
+		if (err == 0)
+			kfree_skb(skb);
+		break;
+	}
+}
+
+/*
+ * Returns:
+ * <= 0: driver handled the data exchange
+ *    1: driver doesn't especially handle, please do standard processing
+ */
+static int st21nfca_hci_im_transceive(struct nfc_hci_dev *hdev,
+				      struct nfc_target *target,
+				      struct sk_buff *skb,
+				      data_exchange_cb_t cb, void *cb_context)
+{
+	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
+
+	pr_info(DRIVER_DESC ": %s for gate=%d len=%d\n", __func__,
+		target->hci_reader_gate, skb->len);
+
+	switch (target->hci_reader_gate) {
+	case ST21NFCA_RF_READER_F_GATE:
+		if (target->supported_protocols == NFC_PROTO_NFC_DEP_MASK)
+			return st21nfca_im_send_dep_req(hdev, skb);
+
+		*skb_push(skb, 1) = 0x1a;
+		return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
+					      ST21NFCA_WR_XCHG_DATA, skb->data,
+					      skb->len, cb, cb_context);
+	case ST21NFCA_RF_READER_14443_3_A_GATE:
+		*skb_push(skb, 1) = 0x1a;	/* CTR, see spec:10.2.2.1 */
+
+		return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
+					      ST21NFCA_WR_XCHG_DATA, skb->data,
+					      skb->len, cb, cb_context);
+	case ST21NFCA_RF_READER_ISO15693_GATE:
+		info->async_cb_type = ST21NFCA_CB_TYPE_READER_ISO15693;
+		info->async_cb = cb;
+		info->async_cb_context = cb_context;
+
+		*skb_push(skb, 1) = 0x17;
+
+		return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
+					      ST21NFCA_WR_XCHG_DATA, skb->data,
+					      skb->len,
+					      st21nfca_hci_data_exchange_cb,
+					      info);
+		break;
+	default:
+		return 1;
+	}
+}
+
+static int st21nfca_hci_tm_send(struct nfc_hci_dev *hdev, struct sk_buff *skb)
+{
+	return st21nfca_tm_send_dep_res(hdev, skb);
+}
+
+static int st21nfca_hci_check_presence(struct nfc_hci_dev *hdev,
+				       struct nfc_target *target)
+{
+	u8 fwi = 0x11;
+
+	switch (target->hci_reader_gate) {
+	case NFC_HCI_RF_READER_A_GATE:
+	case NFC_HCI_RF_READER_B_GATE:
+		/*
+		 * PRESENCE_CHECK on those gates is available
+		 * However, the answer to this command is taking 3 * fwi
+		 * if the card is no present.
+		 * Instead, we send an empty I-Frame with a very short
+		 * configurable fwi ~604µs.
+		 */
+		return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
+					ST21NFCA_WR_XCHG_DATA, &fwi, 1, NULL);
+	case ST21NFCA_RF_READER_14443_3_A_GATE:
+		return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
+					ST21NFCA_RF_READER_CMD_PRESENCE_CHECK,
+					NULL, 0, NULL);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static void st21nfca_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
+				struct sk_buff *skb)
+{
+	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
+	u8 gate = hdev->pipes[pipe].gate;
+
+	pr_debug("cmd: %x\n", cmd);
+
+	switch (cmd) {
+	case NFC_HCI_ANY_OPEN_PIPE:
+		if (gate != ST21NFCA_APDU_READER_GATE &&
+			hdev->pipes[pipe].dest_host != NFC_HCI_UICC_HOST_ID)
+			info->se_info.count_pipes++;
+
+		if (info->se_info.count_pipes == info->se_info.expected_pipes) {
+			del_timer_sync(&info->se_info.se_active_timer);
+			info->se_info.se_active = false;
+			info->se_info.count_pipes = 0;
+			complete(&info->se_info.req_completion);
+		}
+	break;
+	}
+}
+
+static int st21nfca_admin_event_received(struct nfc_hci_dev *hdev, u8 event,
+					struct sk_buff *skb)
+{
+	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
+
+	pr_debug("admin event: %x\n", event);
+
+	switch (event) {
+	case ST21NFCA_EVT_HOT_PLUG:
+		if (info->se_info.se_active) {
+			if (!ST21NFCA_EVT_HOT_PLUG_IS_INHIBITED(skb)) {
+				del_timer_sync(&info->se_info.se_active_timer);
+				info->se_info.se_active = false;
+				complete(&info->se_info.req_completion);
+			} else {
+				mod_timer(&info->se_info.se_active_timer,
+					jiffies +
+					msecs_to_jiffies(ST21NFCA_SE_TO_PIPES));
+			}
+		}
+	break;
+	}
+	kfree_skb(skb);
+	return 0;
+}
+
+/*
+ * Returns:
+ * <= 0: driver handled the event, skb consumed
+ *    1: driver does not handle the event, please do standard processing
+ */
+static int st21nfca_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe,
+				       u8 event, struct sk_buff *skb)
+{
+	u8 gate = hdev->pipes[pipe].gate;
+	u8 host = hdev->pipes[pipe].dest_host;
+
+	pr_debug("hci event: %d gate: %x\n", event, gate);
+
+	switch (gate) {
+	case NFC_HCI_ADMIN_GATE:
+		return st21nfca_admin_event_received(hdev, event, skb);
+	case ST21NFCA_RF_CARD_F_GATE:
+		return st21nfca_dep_event_received(hdev, event, skb);
+	case ST21NFCA_CONNECTIVITY_GATE:
+		return st21nfca_connectivity_event_received(hdev, host,
+							event, skb);
+	case ST21NFCA_APDU_READER_GATE:
+		return st21nfca_apdu_reader_event_received(hdev, event, skb);
+	default:
+		return 1;
+	}
+}
+
+static struct nfc_hci_ops st21nfca_hci_ops = {
+	.open = st21nfca_hci_open,
+	.close = st21nfca_hci_close,
+	.load_session = st21nfca_hci_load_session,
+	.hci_ready = st21nfca_hci_ready,
+	.xmit = st21nfca_hci_xmit,
+	.start_poll = st21nfca_hci_start_poll,
+	.stop_poll = st21nfca_hci_stop_poll,
+	.dep_link_up = st21nfca_hci_dep_link_up,
+	.dep_link_down = st21nfca_hci_dep_link_down,
+	.target_from_gate = st21nfca_hci_target_from_gate,
+	.complete_target_discovered = st21nfca_hci_complete_target_discovered,
+	.im_transceive = st21nfca_hci_im_transceive,
+	.tm_send = st21nfca_hci_tm_send,
+	.check_presence = st21nfca_hci_check_presence,
+	.event_received = st21nfca_hci_event_received,
+	.cmd_received = st21nfca_hci_cmd_received,
+	.discover_se = st21nfca_hci_discover_se,
+	.enable_se = st21nfca_hci_enable_se,
+	.disable_se = st21nfca_hci_disable_se,
+	.se_io = st21nfca_hci_se_io,
+};
+
+int st21nfca_hci_probe(void *phy_id, struct nfc_phy_ops *phy_ops,
+		       char *llc_name, int phy_headroom, int phy_tailroom,
+		       int phy_payload, struct nfc_hci_dev **hdev,
+			   struct st21nfca_se_status *se_status)
+{
+	struct st21nfca_hci_info *info;
+	int r = 0;
+	int dev_num;
+	u32 protocols;
+	struct nfc_hci_init_data init_data;
+	unsigned long quirks = 0;
+
+	info = kzalloc(sizeof(struct st21nfca_hci_info), GFP_KERNEL);
+	if (!info) {
+		r = -ENOMEM;
+		goto err_alloc_hdev;
+	}
+
+	info->phy_ops = phy_ops;
+	info->phy_id = phy_id;
+	info->state = ST21NFCA_ST_COLD;
+	mutex_init(&info->info_lock);
+
+	init_data.gate_count = ARRAY_SIZE(st21nfca_gates);
+
+	memcpy(init_data.gates, st21nfca_gates, sizeof(st21nfca_gates));
+
+	/*
+	 * Session id must include the driver name + i2c bus addr
+	 * persistent info to discriminate 2 identical chips
+	 */
+	dev_num = find_first_zero_bit(dev_mask, ST21NFCA_NUM_DEVICES);
+
+	if (dev_num >= ST21NFCA_NUM_DEVICES)
+		return -ENODEV;
+
+	set_bit(dev_num, dev_mask);
+
+	scnprintf(init_data.session_id, sizeof(init_data.session_id), "%s%2x",
+		  "ST21AH", dev_num);
+
+	protocols = NFC_PROTO_JEWEL_MASK |
+	    NFC_PROTO_MIFARE_MASK |
+	    NFC_PROTO_FELICA_MASK |
+	    NFC_PROTO_ISO14443_MASK |
+	    NFC_PROTO_ISO14443_B_MASK |
+	    NFC_PROTO_ISO15693_MASK |
+	    NFC_PROTO_NFC_DEP_MASK;
+
+	set_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &quirks);
+
+	info->hdev =
+	    nfc_hci_allocate_device(&st21nfca_hci_ops, &init_data, quirks,
+				    protocols, llc_name,
+				    phy_headroom + ST21NFCA_CMDS_HEADROOM,
+				    phy_tailroom, phy_payload);
+
+	if (!info->hdev) {
+		pr_err("Cannot allocate nfc hdev.\n");
+		r = -ENOMEM;
+		goto err_alloc_hdev;
+	}
+
+	info->se_status = se_status;
+
+	nfc_hci_set_clientdata(info->hdev, info);
+
+	r = nfc_hci_register_device(info->hdev);
+	if (r)
+		goto err_regdev;
+
+	*hdev = info->hdev;
+	st21nfca_dep_init(info->hdev);
+	st21nfca_se_init(info->hdev);
+
+	return 0;
+
+err_regdev:
+	nfc_hci_free_device(info->hdev);
+
+err_alloc_hdev:
+	kfree(info);
+
+	return r;
+}
+EXPORT_SYMBOL(st21nfca_hci_probe);
+
+void st21nfca_hci_remove(struct nfc_hci_dev *hdev)
+{
+	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
+
+	st21nfca_dep_deinit(hdev);
+	st21nfca_se_deinit(hdev);
+	nfc_hci_unregister_device(hdev);
+	nfc_hci_free_device(hdev);
+	kfree(info);
+}
+EXPORT_SYMBOL(st21nfca_hci_remove);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(DRIVER_DESC);