text: /*
   * 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 <net/nfc/hci.h>
  
  #include "st21nfca.h"
  
  #define ST21NFCA_NFCIP1_INITIATOR 0x00
  #define ST21NFCA_NFCIP1_REQ 0xd4
  #define ST21NFCA_NFCIP1_RES 0xd5
  #define ST21NFCA_NFCIP1_ATR_REQ 0x00
  #define ST21NFCA_NFCIP1_ATR_RES 0x01
  #define ST21NFCA_NFCIP1_PSL_REQ 0x04
  #define ST21NFCA_NFCIP1_PSL_RES 0x05
  #define ST21NFCA_NFCIP1_DEP_REQ 0x06
  #define ST21NFCA_NFCIP1_DEP_RES 0x07
  
  #define ST21NFCA_NFC_DEP_PFB_PNI(pfb)     ((pfb) & 0x03)
  #define ST21NFCA_NFC_DEP_PFB_TYPE(pfb) ((pfb) & 0xE0)
  #define ST21NFCA_NFC_DEP_PFB_IS_TIMEOUT(pfb) \
  				((pfb) & ST21NFCA_NFC_DEP_PFB_TIMEOUT_BIT)
  #define ST21NFCA_NFC_DEP_DID_BIT_SET(pfb) ((pfb) & 0x04)
  #define ST21NFCA_NFC_DEP_NAD_BIT_SET(pfb) ((pfb) & 0x08)
  #define ST21NFCA_NFC_DEP_PFB_TIMEOUT_BIT 0x10
  
  #define ST21NFCA_NFC_DEP_PFB_IS_TIMEOUT(pfb) \
  				((pfb) & ST21NFCA_NFC_DEP_PFB_TIMEOUT_BIT)
  
  #define ST21NFCA_NFC_DEP_PFB_I_PDU          0x00
  #define ST21NFCA_NFC_DEP_PFB_ACK_NACK_PDU   0x40
  #define ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU 0x80
  
  #define ST21NFCA_ATR_REQ_MIN_SIZE 17
  #define ST21NFCA_ATR_REQ_MAX_SIZE 65
  #define ST21NFCA_LR_BITS_PAYLOAD_SIZE_254B 0x30
  #define ST21NFCA_GB_BIT  0x02
  
  #define ST21NFCA_EVT_SEND_DATA		0x10
  #define ST21NFCA_EVT_FIELD_ON           0x11
  #define ST21NFCA_EVT_CARD_DEACTIVATED   0x12
  #define ST21NFCA_EVT_CARD_ACTIVATED     0x13
  #define ST21NFCA_EVT_FIELD_OFF          0x14
  
  #define ST21NFCA_EVT_CARD_F_BITRATE 0x16
  #define ST21NFCA_EVT_READER_F_BITRATE 0x13
  #define	ST21NFCA_PSL_REQ_SEND_SPEED(brs) (brs & 0x38)
  #define ST21NFCA_PSL_REQ_RECV_SPEED(brs) (brs & 0x07)
  #define ST21NFCA_PP2LRI(pp) ((pp & 0x30) >> 4)
  #define ST21NFCA_CARD_BITRATE_212 0x01
  #define ST21NFCA_CARD_BITRATE_424 0x02
  
  #define ST21NFCA_DEFAULT_TIMEOUT 0x0a
  
  
  #define PROTOCOL_ERR(req) pr_err("%d: ST21NFCA Protocol error: %s\n", \
  				 __LINE__, req)
  
  struct st21nfca_atr_req {
  	u8 length;
  	u8 cmd0;
  	u8 cmd1;
  	u8 nfcid3[NFC_NFCID3_MAXSIZE];
  	u8 did;
  	u8 bsi;
  	u8 bri;
  	u8 ppi;
  	u8 gbi[0];
  } __packed;
  
  struct st21nfca_atr_res {
  	u8 length;
  	u8 cmd0;
  	u8 cmd1;
  	u8 nfcid3[NFC_NFCID3_MAXSIZE];
  	u8 did;
  	u8 bsi;
  	u8 bri;
  	u8 to;
  	u8 ppi;
  	u8 gbi[0];
  } __packed;
  
  struct st21nfca_psl_req {
  	u8 length;
  	u8 cmd0;
  	u8 cmd1;
  	u8 did;
  	u8 brs;
  	u8 fsl;
  } __packed;
  
  struct st21nfca_psl_res {
  	u8 length;
  	u8 cmd0;
  	u8 cmd1;
  	u8 did;
  } __packed;
  
  struct st21nfca_dep_req_res {
  	u8 length;
  	u8 cmd0;
  	u8 cmd1;
  	u8 pfb;
  	u8 did;
  	u8 nad;
  } __packed;
  
  static void st21nfca_tx_work(struct work_struct *work)
  {
  	struct st21nfca_hci_info *info = container_of(work,
  						struct st21nfca_hci_info,
  						dep_info.tx_work);
  
  	struct nfc_dev *dev;
  	struct sk_buff *skb;
  
  	if (info) {
  		dev = info->hdev->ndev;
  		skb = info->dep_info.tx_pending;
  
  		device_lock(&dev->dev);
  
  		nfc_hci_send_cmd_async(info->hdev, ST21NFCA_RF_READER_F_GATE,
  				ST21NFCA_WR_XCHG_DATA, skb->data, skb->len,
  				info->async_cb, info);
  		device_unlock(&dev->dev);
  		kfree_skb(skb);
  	}
  }
  
  static void st21nfca_im_send_pdu(struct st21nfca_hci_info *info,
  						struct sk_buff *skb)
  {
  	info->dep_info.tx_pending = skb;
  	schedule_work(&info->dep_info.tx_work);
  }
  
  static int st21nfca_tm_send_atr_res(struct nfc_hci_dev *hdev,
  				    struct st21nfca_atr_req *atr_req)
  {
  	struct st21nfca_atr_res *atr_res;
  	struct sk_buff *skb;
  	size_t gb_len;
  	int r;
  	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
  
  	gb_len = atr_req->length - sizeof(struct st21nfca_atr_req);
  	skb = alloc_skb(atr_req->length + 1, GFP_KERNEL);
  	if (!skb)
  		return -ENOMEM;
  
  	skb_put(skb, sizeof(struct st21nfca_atr_res));
  
  	atr_res = (struct st21nfca_atr_res *)skb->data;
  	memset(atr_res, 0, sizeof(struct st21nfca_atr_res));
  
  	atr_res->length = atr_req->length + 1;
  	atr_res->cmd0 = ST21NFCA_NFCIP1_RES;
  	atr_res->cmd1 = ST21NFCA_NFCIP1_ATR_RES;
  
  	memcpy(atr_res->nfcid3, atr_req->nfcid3, 6);
  	atr_res->bsi = 0x00;
  	atr_res->bri = 0x00;
  	atr_res->to = ST21NFCA_DEFAULT_TIMEOUT;
  	atr_res->ppi = ST21NFCA_LR_BITS_PAYLOAD_SIZE_254B;
  
  	if (gb_len) {
  		skb_put(skb, gb_len);
  
  		atr_res->ppi |= ST21NFCA_GB_BIT;
  		memcpy(atr_res->gbi, atr_req->gbi, gb_len);
  		r = nfc_set_remote_general_bytes(hdev->ndev, atr_res->gbi,
  						  gb_len);
  		if (r < 0)
  			return r;
  	}
  
  	info->dep_info.curr_nfc_dep_pni = 0;
  
  	r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
  				ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
  	kfree_skb(skb);
  	return r;
  }
  
  static int st21nfca_tm_recv_atr_req(struct nfc_hci_dev *hdev,
  				    struct sk_buff *skb)
  {
  	struct st21nfca_atr_req *atr_req;
  	size_t gb_len;
  	int r;
  
  	skb_trim(skb, skb->len - 1);
  
  	if (!skb->len) {
  		r = -EIO;
  		goto exit;
  	}
  
  	if (skb->len < ST21NFCA_ATR_REQ_MIN_SIZE) {
  		r = -EPROTO;
  		goto exit;
  	}
  
  	atr_req = (struct st21nfca_atr_req *)skb->data;
  
  	if (atr_req->length < sizeof(struct st21nfca_atr_req)) {
  		r = -EPROTO;
  		goto exit;
  	}
  
  	r = st21nfca_tm_send_atr_res(hdev, atr_req);
  	if (r)
  		goto exit;
  
  	gb_len = skb->len - sizeof(struct st21nfca_atr_req);
  
  	r = nfc_tm_activated(hdev->ndev, NFC_PROTO_NFC_DEP_MASK,
  			      NFC_COMM_PASSIVE, atr_req->gbi, gb_len);
  	if (r)
  		goto exit;
  
  	r = 0;
  
  exit:
  	return r;
  }
  
  static int st21nfca_tm_send_psl_res(struct nfc_hci_dev *hdev,
  				    struct st21nfca_psl_req *psl_req)
  {
  	struct st21nfca_psl_res *psl_res;
  	struct sk_buff *skb;
  	u8 bitrate[2] = {0, 0};
  	int r;
  
  	skb = alloc_skb(sizeof(struct st21nfca_psl_res), GFP_KERNEL);
  	if (!skb)
  		return -ENOMEM;
  	skb_put(skb, sizeof(struct st21nfca_psl_res));
  
  	psl_res = (struct st21nfca_psl_res *)skb->data;
  
  	psl_res->length = sizeof(struct st21nfca_psl_res);
  	psl_res->cmd0 = ST21NFCA_NFCIP1_RES;
  	psl_res->cmd1 = ST21NFCA_NFCIP1_PSL_RES;
  	psl_res->did = psl_req->did;
  
  	r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
  				ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
  	if (r < 0)
  		goto error;
  
  	/*
  	 * ST21NFCA only support P2P passive.
  	 * PSL_REQ BRS value != 0 has only a meaning to
  	 * change technology to type F.
  	 * We change to BITRATE 424Kbits.
  	 * In other case switch to BITRATE 106Kbits.
  	 */
  	if (ST21NFCA_PSL_REQ_SEND_SPEED(psl_req->brs) &&
  	    ST21NFCA_PSL_REQ_RECV_SPEED(psl_req->brs)) {
  		bitrate[0] = ST21NFCA_CARD_BITRATE_424;
  		bitrate[1] = ST21NFCA_CARD_BITRATE_424;
  	}
  
  	/* Send an event to change bitrate change event to card f */
  	r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
  			ST21NFCA_EVT_CARD_F_BITRATE, bitrate, 2);
  error:
  	kfree_skb(skb);
  	return r;
  }
  
  static int st21nfca_tm_recv_psl_req(struct nfc_hci_dev *hdev,
  				    struct sk_buff *skb)
  {
  	struct st21nfca_psl_req *psl_req;
  	int r;
  
  	skb_trim(skb, skb->len - 1);
  
  	if (!skb->len) {
  		r = -EIO;
  		goto exit;
  	}
  
  	psl_req = (struct st21nfca_psl_req *)skb->data;
  
  	if (skb->len < sizeof(struct st21nfca_psl_req)) {
  		r = -EIO;
  		goto exit;
  	}
  
  	r = st21nfca_tm_send_psl_res(hdev, psl_req);
  exit:
  	return r;
  }
  
  int st21nfca_tm_send_dep_res(struct nfc_hci_dev *hdev, struct sk_buff *skb)
  {
  	int r;
  	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
  
  	*skb_push(skb, 1) = info->dep_info.curr_nfc_dep_pni;
  	*skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_RES;
  	*skb_push(skb, 1) = ST21NFCA_NFCIP1_RES;
  	*skb_push(skb, 1) = skb->len;
  
  	r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
  			ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
  	kfree_skb(skb);
  
  	return r;
  }
  EXPORT_SYMBOL(st21nfca_tm_send_dep_res);
  
  static int st21nfca_tm_recv_dep_req(struct nfc_hci_dev *hdev,
  				    struct sk_buff *skb)
  {
  	struct st21nfca_dep_req_res *dep_req;
  	u8 size;
  	int r;
  	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
  
  	skb_trim(skb, skb->len - 1);
  
  	size = 4;
  
  	dep_req = (struct st21nfca_dep_req_res *)skb->data;
  	if (skb->len < size) {
  		r = -EIO;
  		goto exit;
  	}
  
  	if (ST21NFCA_NFC_DEP_DID_BIT_SET(dep_req->pfb))
  		size++;
  	if (ST21NFCA_NFC_DEP_NAD_BIT_SET(dep_req->pfb))
  		size++;
  
  	if (skb->len < size) {
  		r = -EIO;
  		goto exit;
  	}
  
  	/* Receiving DEP_REQ - Decoding */
  	switch (ST21NFCA_NFC_DEP_PFB_TYPE(dep_req->pfb)) {
  	case ST21NFCA_NFC_DEP_PFB_I_PDU:
  		info->dep_info.curr_nfc_dep_pni =
  				ST21NFCA_NFC_DEP_PFB_PNI(dep_req->pfb);
  		break;
  	case ST21NFCA_NFC_DEP_PFB_ACK_NACK_PDU:
  		pr_err("Received a ACK/NACK PDU\n");
  		break;
  	case ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU:
  		pr_err("Received a SUPERVISOR PDU\n");
  		break;
  	}
  
  	skb_pull(skb, size);
  
  	return nfc_tm_data_received(hdev->ndev, skb);
  exit:
  	return r;
  }
  
  static int st21nfca_tm_event_send_data(struct nfc_hci_dev *hdev,
  				struct sk_buff *skb)
  {
  	u8 cmd0, cmd1;
  	int r;
  
  	cmd0 = skb->data[1];
  	switch (cmd0) {
  	case ST21NFCA_NFCIP1_REQ:
  		cmd1 = skb->data[2];
  		switch (cmd1) {
  		case ST21NFCA_NFCIP1_ATR_REQ:
  			r = st21nfca_tm_recv_atr_req(hdev, skb);
  			break;
  		case ST21NFCA_NFCIP1_PSL_REQ:
  			r = st21nfca_tm_recv_psl_req(hdev, skb);
  			break;
  		case ST21NFCA_NFCIP1_DEP_REQ:
  			r = st21nfca_tm_recv_dep_req(hdev, skb);
  			break;
  		default:
  			return 1;
  		}
  	default:
  		return 1;
  	}
  	return r;
  }
  
  /*
   * Returns:
   * <= 0: driver handled the event, skb consumed
   *    1: driver does not handle the event, please do standard processing
   */
  int st21nfca_dep_event_received(struct nfc_hci_dev *hdev,
  				u8 event, struct sk_buff *skb)
  {
  	int r = 0;
  	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
  
  	pr_debug("dep event: %d\n", event);
  
  	switch (event) {
  	case ST21NFCA_EVT_CARD_ACTIVATED:
  		info->dep_info.curr_nfc_dep_pni = 0;
  		break;
  	case ST21NFCA_EVT_CARD_DEACTIVATED:
  		break;
  	case ST21NFCA_EVT_FIELD_ON:
  		break;
  	case ST21NFCA_EVT_FIELD_OFF:
  		break;
  	case ST21NFCA_EVT_SEND_DATA:
  		r = st21nfca_tm_event_send_data(hdev, skb);
  		if (r < 0)
  			return r;
  		return 0;
  	default:
  		nfc_err(&hdev->ndev->dev, "Unexpected event on card f gate\n");
  		return 1;
  	}
  	kfree_skb(skb);
  	return r;
  }
  EXPORT_SYMBOL(st21nfca_dep_event_received);
  
  static void st21nfca_im_send_psl_req(struct nfc_hci_dev *hdev, u8 did, u8 bsi,
  				     u8 bri, u8 lri)
  {
  	struct sk_buff *skb;
  	struct st21nfca_psl_req *psl_req;
  	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
  
  	skb =
  	    alloc_skb(sizeof(struct st21nfca_psl_req) + 1, GFP_KERNEL);
  	if (!skb)
  		return;
  	skb_reserve(skb, 1);
  
  	skb_put(skb, sizeof(struct st21nfca_psl_req));
  	psl_req = (struct st21nfca_psl_req *) skb->data;
  
  	psl_req->length = sizeof(struct st21nfca_psl_req);
  	psl_req->cmd0 = ST21NFCA_NFCIP1_REQ;
  	psl_req->cmd1 = ST21NFCA_NFCIP1_PSL_REQ;
  	psl_req->did = did;
  	psl_req->brs = (0x30 & bsi << 4) | (bri & 0x03);
  	psl_req->fsl = lri;
  
  	*skb_push(skb, 1) = info->dep_info.to | 0x10;
  
  	st21nfca_im_send_pdu(info, skb);
  }
  
  #define ST21NFCA_CB_TYPE_READER_F 1
  static void st21nfca_im_recv_atr_res_cb(void *context, struct sk_buff *skb,
  					int err)
  {
  	struct st21nfca_hci_info *info = context;
  	struct st21nfca_atr_res *atr_res;
  	int r;
  
  	if (err != 0)
  		return;
  
  	if (!skb)
  		return;
  
  	switch (info->async_cb_type) {
  	case ST21NFCA_CB_TYPE_READER_F:
  		skb_trim(skb, skb->len - 1);
  		atr_res = (struct st21nfca_atr_res *)skb->data;
  		r = nfc_set_remote_general_bytes(info->hdev->ndev,
  				atr_res->gbi,
  				skb->len - sizeof(struct st21nfca_atr_res));
  		if (r < 0)
  			return;
  
  		if (atr_res->to >= 0x0e)
  			info->dep_info.to = 0x0e;
  		else
  			info->dep_info.to = atr_res->to + 1;
  
  		info->dep_info.to |= 0x10;
  
  		r = nfc_dep_link_is_up(info->hdev->ndev, info->dep_info.idx,
  					NFC_COMM_PASSIVE, NFC_RF_INITIATOR);
  		if (r < 0)
  			return;
  
  		info->dep_info.curr_nfc_dep_pni = 0;
  		if (ST21NFCA_PP2LRI(atr_res->ppi) != info->dep_info.lri)
  			st21nfca_im_send_psl_req(info->hdev, atr_res->did,
  						atr_res->bsi, atr_res->bri,
  						ST21NFCA_PP2LRI(atr_res->ppi));
  		break;
  	default:
  		kfree_skb(skb);
  		break;
  	}
  }
  
  int st21nfca_im_send_atr_req(struct nfc_hci_dev *hdev, u8 *gb, size_t gb_len)
  {
  	struct sk_buff *skb;
  	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
  	struct st21nfca_atr_req *atr_req;
  	struct nfc_target *target;
  	uint size;
  
  	info->dep_info.to = ST21NFCA_DEFAULT_TIMEOUT;
  	size = ST21NFCA_ATR_REQ_MIN_SIZE + gb_len;
  	if (size > ST21NFCA_ATR_REQ_MAX_SIZE) {
  		PROTOCOL_ERR("14.6.1.1");
  		return -EINVAL;
  	}
  
  	skb =
  	    alloc_skb(sizeof(struct st21nfca_atr_req) + gb_len + 1, GFP_KERNEL);
  	if (!skb)
  		return -ENOMEM;
  
  	skb_reserve(skb, 1);
  
  	skb_put(skb, sizeof(struct st21nfca_atr_req));
  
  	atr_req = (struct st21nfca_atr_req *)skb->data;
  	memset(atr_req, 0, sizeof(struct st21nfca_atr_req));
  
  	atr_req->cmd0 = ST21NFCA_NFCIP1_REQ;
  	atr_req->cmd1 = ST21NFCA_NFCIP1_ATR_REQ;
  	memset(atr_req->nfcid3, 0, NFC_NFCID3_MAXSIZE);
  	target = hdev->ndev->targets;
  
  	if (target->sensf_res_len > 0)
  		memcpy(atr_req->nfcid3, target->sensf_res,
  				target->sensf_res_len);
  	else
  		get_random_bytes(atr_req->nfcid3, NFC_NFCID3_MAXSIZE);
  
  	atr_req->did = 0x0;
  
  	atr_req->bsi = 0x00;
  	atr_req->bri = 0x00;
  	atr_req->ppi = ST21NFCA_LR_BITS_PAYLOAD_SIZE_254B;
  	if (gb_len) {
  		atr_req->ppi |= ST21NFCA_GB_BIT;
  		memcpy(skb_put(skb, gb_len), gb, gb_len);
  	}
  	atr_req->length = sizeof(struct st21nfca_atr_req) + hdev->gb_len;
  
  	*skb_push(skb, 1) = info->dep_info.to | 0x10; /* timeout */
  
  	info->async_cb_type = ST21NFCA_CB_TYPE_READER_F;
  	info->async_cb_context = info;
  	info->async_cb = st21nfca_im_recv_atr_res_cb;
  	info->dep_info.bri = atr_req->bri;
  	info->dep_info.bsi = atr_req->bsi;
  	info->dep_info.lri = ST21NFCA_PP2LRI(atr_req->ppi);
  
  	return nfc_hci_send_cmd_async(hdev, ST21NFCA_RF_READER_F_GATE,
  				ST21NFCA_WR_XCHG_DATA, skb->data,
  				skb->len, info->async_cb, info);
  }
  EXPORT_SYMBOL(st21nfca_im_send_atr_req);
  
  static void st21nfca_im_recv_dep_res_cb(void *context, struct sk_buff *skb,
  					int err)
  {
  	struct st21nfca_hci_info *info = context;
  	struct st21nfca_dep_req_res *dep_res;
  
  	int size;
  
  	if (err != 0)
  		return;
  
  	if (!skb)
  		return;
  
  	switch (info->async_cb_type) {
  	case ST21NFCA_CB_TYPE_READER_F:
  		dep_res = (struct st21nfca_dep_req_res *)skb->data;
  
  		size = 3;
  		if (skb->len < size)
  			goto exit;
  
  		if (ST21NFCA_NFC_DEP_DID_BIT_SET(dep_res->pfb))
  			size++;
  		if (ST21NFCA_NFC_DEP_NAD_BIT_SET(dep_res->pfb))
  			size++;
  
  		if (skb->len < size)
  			goto exit;
  
  		skb_trim(skb, skb->len - 1);
  
  		/* Receiving DEP_REQ - Decoding */
  		switch (ST21NFCA_NFC_DEP_PFB_TYPE(dep_res->pfb)) {
  		case ST21NFCA_NFC_DEP_PFB_ACK_NACK_PDU:
  			pr_err("Received a ACK/NACK PDU\n");
  		case ST21NFCA_NFC_DEP_PFB_I_PDU:
  			info->dep_info.curr_nfc_dep_pni =
  			    ST21NFCA_NFC_DEP_PFB_PNI(dep_res->pfb + 1);
  			size++;
  			skb_pull(skb, size);
  			nfc_tm_data_received(info->hdev->ndev, skb);
  			break;
  		case ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU:
  			pr_err("Received a SUPERVISOR PDU\n");
  			skb_pull(skb, size);
  			*skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_REQ;
  			*skb_push(skb, 1) = ST21NFCA_NFCIP1_REQ;
  			*skb_push(skb, 1) = skb->len;
  			*skb_push(skb, 1) = info->dep_info.to | 0x10;
  
  			st21nfca_im_send_pdu(info, skb);
  			break;
  		}
  
  		return;
  	default:
  		break;
  	}
  
  exit:
  	kfree_skb(skb);
  }
  
  int st21nfca_im_send_dep_req(struct nfc_hci_dev *hdev, struct sk_buff *skb)
  {
  	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
  
  	info->async_cb_type = ST21NFCA_CB_TYPE_READER_F;
  	info->async_cb_context = info;
  	info->async_cb = st21nfca_im_recv_dep_res_cb;
  
  	*skb_push(skb, 1) = info->dep_info.curr_nfc_dep_pni;
  	*skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_REQ;
  	*skb_push(skb, 1) = ST21NFCA_NFCIP1_REQ;
  	*skb_push(skb, 1) = skb->len;
  
  	*skb_push(skb, 1) = info->dep_info.to | 0x10;
  
  	return nfc_hci_send_cmd_async(hdev, ST21NFCA_RF_READER_F_GATE,
  				      ST21NFCA_WR_XCHG_DATA,
  				      skb->data, skb->len,
  				      info->async_cb, info);
  }
  EXPORT_SYMBOL(st21nfca_im_send_dep_req);
  
  void st21nfca_dep_init(struct nfc_hci_dev *hdev)
  {
  	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
  
  	INIT_WORK(&info->dep_info.tx_work, st21nfca_tx_work);
  	info->dep_info.curr_nfc_dep_pni = 0;
  	info->dep_info.idx = 0;
  	info->dep_info.to = ST21NFCA_DEFAULT_TIMEOUT;
  }
  EXPORT_SYMBOL(st21nfca_dep_init);
  
  void st21nfca_dep_deinit(struct nfc_hci_dev *hdev)
  {
  	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
  
  	cancel_work_sync(&info->dep_info.tx_work);
  }
  EXPORT_SYMBOL(st21nfca_dep_deinit);
  