[mirror_ubuntu-jammy-kernel.git] / drivers / nfc / st21nfca / dep.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2014  STMicroelectronics SAS. All rights reserved.
 */

#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);

	*(u8 *)skb_push(skb, 1) = info->dep_info.curr_nfc_dep_pni;
	*(u8 *)skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_RES;
	*(u8 *)skb_push(skb, 1) = ST21NFCA_NFCIP1_RES;
	*(u8 *)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;
		}
		break;
	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;

	*(u8 *)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;
		skb_put_data(skb, gb, gb_len);
	}
	atr_req->length = sizeof(struct st21nfca_atr_req) + hdev->gb_len;

	*(u8 *)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");
			/* fall through */
		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);
			*(u8 *)skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_REQ;
			*(u8 *)skb_push(skb, 1) = ST21NFCA_NFCIP1_REQ;
			*(u8 *)skb_push(skb, 1) = skb->len;
			*(u8 *)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;

	*(u8 *)skb_push(skb, 1) = info->dep_info.curr_nfc_dep_pni;
	*(u8 *)skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_REQ;
	*(u8 *)skb_push(skb, 1) = ST21NFCA_NFCIP1_REQ;
	*(u8 *)skb_push(skb, 1) = skb->len;

	*(u8 *)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);
Commit	Line	Data
46fe7771	1	// SPDX-License-Identifier: GPL-2.0-only
1892bf84 CR	2	/*
1892bf84 CR	3	* Copyright (C) 2014 STMicroelectronics SAS. All rights reserved.
1892bf84 CR	4	*/
	5
	6	#include <net/nfc/hci.h>
	7
	8	#include "st21nfca.h"
1892bf84 CR	9
	10	#define ST21NFCA_NFCIP1_INITIATOR 0x00
	11	#define ST21NFCA_NFCIP1_REQ 0xd4
	12	#define ST21NFCA_NFCIP1_RES 0xd5
	13	#define ST21NFCA_NFCIP1_ATR_REQ 0x00
	14	#define ST21NFCA_NFCIP1_ATR_RES 0x01
	15	#define ST21NFCA_NFCIP1_PSL_REQ 0x04
	16	#define ST21NFCA_NFCIP1_PSL_RES 0x05
	17	#define ST21NFCA_NFCIP1_DEP_REQ 0x06
	18	#define ST21NFCA_NFCIP1_DEP_RES 0x07
	19
	20	#define ST21NFCA_NFC_DEP_PFB_PNI(pfb) ((pfb) & 0x03)
	21	#define ST21NFCA_NFC_DEP_PFB_TYPE(pfb) ((pfb) & 0xE0)
	22	#define ST21NFCA_NFC_DEP_PFB_IS_TIMEOUT(pfb) \
	23	((pfb) & ST21NFCA_NFC_DEP_PFB_TIMEOUT_BIT)
	24	#define ST21NFCA_NFC_DEP_DID_BIT_SET(pfb) ((pfb) & 0x04)
	25	#define ST21NFCA_NFC_DEP_NAD_BIT_SET(pfb) ((pfb) & 0x08)
	26	#define ST21NFCA_NFC_DEP_PFB_TIMEOUT_BIT 0x10
	27
	28	#define ST21NFCA_NFC_DEP_PFB_IS_TIMEOUT(pfb) \
	29	((pfb) & ST21NFCA_NFC_DEP_PFB_TIMEOUT_BIT)
	30
	31	#define ST21NFCA_NFC_DEP_PFB_I_PDU 0x00
	32	#define ST21NFCA_NFC_DEP_PFB_ACK_NACK_PDU 0x40
	33	#define ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU 0x80
	34
	35	#define ST21NFCA_ATR_REQ_MIN_SIZE 17
	36	#define ST21NFCA_ATR_REQ_MAX_SIZE 65
	37	#define ST21NFCA_LR_BITS_PAYLOAD_SIZE_254B 0x30
	38	#define ST21NFCA_GB_BIT 0x02
	39
a4415e76 CR	40	#define ST21NFCA_EVT_SEND_DATA 0x10
	41	#define ST21NFCA_EVT_FIELD_ON 0x11
	42	#define ST21NFCA_EVT_CARD_DEACTIVATED 0x12
	43	#define ST21NFCA_EVT_CARD_ACTIVATED 0x13
	44	#define ST21NFCA_EVT_FIELD_OFF 0x14
	45
1892bf84 CR	46	#define ST21NFCA_EVT_CARD_F_BITRATE 0x16
	47	#define ST21NFCA_EVT_READER_F_BITRATE 0x13
	48	#define ST21NFCA_PSL_REQ_SEND_SPEED(brs) (brs & 0x38)
	49	#define ST21NFCA_PSL_REQ_RECV_SPEED(brs) (brs & 0x07)
	50	#define ST21NFCA_PP2LRI(pp) ((pp & 0x30) >> 4)
	51	#define ST21NFCA_CARD_BITRATE_212 0x01
	52	#define ST21NFCA_CARD_BITRATE_424 0x02
	53
	54	#define ST21NFCA_DEFAULT_TIMEOUT 0x0a
	55
	56
	57	#define PROTOCOL_ERR(req) pr_err("%d: ST21NFCA Protocol error: %s\n", \
	58	__LINE__, req)
	59
	60	struct st21nfca_atr_req {
	61	u8 length;
	62	u8 cmd0;
	63	u8 cmd1;
	64	u8 nfcid3[NFC_NFCID3_MAXSIZE];
	65	u8 did;
	66	u8 bsi;
	67	u8 bri;
	68	u8 ppi;
	69	u8 gbi[0];
	70	} __packed;
	71
	72	struct st21nfca_atr_res {
	73	u8 length;
	74	u8 cmd0;
	75	u8 cmd1;
	76	u8 nfcid3[NFC_NFCID3_MAXSIZE];
	77	u8 did;
	78	u8 bsi;
	79	u8 bri;
	80	u8 to;
	81	u8 ppi;
	82	u8 gbi[0];
	83	} __packed;
	84
	85	struct st21nfca_psl_req {
	86	u8 length;
	87	u8 cmd0;
	88	u8 cmd1;
	89	u8 did;
	90	u8 brs;
	91	u8 fsl;
	92	} __packed;
	93
	94	struct st21nfca_psl_res {
	95	u8 length;
	96	u8 cmd0;
	97	u8 cmd1;
	98	u8 did;
	99	} __packed;
	100
	101	struct st21nfca_dep_req_res {
	102	u8 length;
	103	u8 cmd0;
	104	u8 cmd1;
	105	u8 pfb;
	106	u8 did;
	107	u8 nad;
	108	} __packed;
	109
110	static void st21nfca_tx_work(struct work_struct *work)
111	{
112	struct st21nfca_hci_info *info = container_of(work,
113	struct st21nfca_hci_info,
114	dep_info.tx_work);
115
116	struct nfc_dev *dev;
117	struct sk_buff *skb;
3e6df919	118
1892bf84 CR	119	if (info) {
	120	dev = info->hdev->ndev;
	121	skb = info->dep_info.tx_pending;
	122
	123	device_lock(&dev->dev);
	124
	125	nfc_hci_send_cmd_async(info->hdev, ST21NFCA_RF_READER_F_GATE,
cc3faac9 CR	126	ST21NFCA_WR_XCHG_DATA, skb->data, skb->len,
cc3faac9 CR	127	info->async_cb, info);
1892bf84 CR	128	device_unlock(&dev->dev);
	129	kfree_skb(skb);
	130	}
	131	}
	132
	133	static void st21nfca_im_send_pdu(struct st21nfca_hci_info *info,
	134	struct sk_buff *skb)
	135	{
	136	info->dep_info.tx_pending = skb;
	137	schedule_work(&info->dep_info.tx_work);
	138	}
	139
	140	static int st21nfca_tm_send_atr_res(struct nfc_hci_dev *hdev,
	141	struct st21nfca_atr_req *atr_req)
	142	{
	143	struct st21nfca_atr_res *atr_res;
	144	struct sk_buff *skb;
	145	size_t gb_len;
	146	int r;
	147	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
	148
	149	gb_len = atr_req->length - sizeof(struct st21nfca_atr_req);
	150	skb = alloc_skb(atr_req->length + 1, GFP_KERNEL);
	151	if (!skb)
	152	return -ENOMEM;
	153
	154	skb_put(skb, sizeof(struct st21nfca_atr_res));
	155
	156	atr_res = (struct st21nfca_atr_res *)skb->data;
	157	memset(atr_res, 0, sizeof(struct st21nfca_atr_res));
	158
	159	atr_res->length = atr_req->length + 1;
	160	atr_res->cmd0 = ST21NFCA_NFCIP1_RES;
	161	atr_res->cmd1 = ST21NFCA_NFCIP1_ATR_RES;
	162
	163	memcpy(atr_res->nfcid3, atr_req->nfcid3, 6);
	164	atr_res->bsi = 0x00;
	165	atr_res->bri = 0x00;
	166	atr_res->to = ST21NFCA_DEFAULT_TIMEOUT;
	167	atr_res->ppi = ST21NFCA_LR_BITS_PAYLOAD_SIZE_254B;
	168
	169	if (gb_len) {
	170	skb_put(skb, gb_len);
	171
	172	atr_res->ppi \|= ST21NFCA_GB_BIT;
	173	memcpy(atr_res->gbi, atr_req->gbi, gb_len);
	174	r = nfc_set_remote_general_bytes(hdev->ndev, atr_res->gbi,
	175	gb_len);
	176	if (r < 0)
	177	return r;
	178	}
	179
	180	info->dep_info.curr_nfc_dep_pni = 0;
	181
ecc6522b	182	r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
1892bf84	183	ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
ecc6522b CR	184	kfree_skb(skb);
ecc6522b CR	185	return r;
1892bf84 CR	186	}
	187
	188	static int st21nfca_tm_recv_atr_req(struct nfc_hci_dev *hdev,
	189	struct sk_buff *skb)
	190	{
	191	struct st21nfca_atr_req *atr_req;
	192	size_t gb_len;
	193	int r;
	194
	195	skb_trim(skb, skb->len - 1);
1892bf84 CR	196
	197	if (!skb->len) {
	198	r = -EIO;
	199	goto exit;
	200	}
	201
	202	if (skb->len < ST21NFCA_ATR_REQ_MIN_SIZE) {
	203	r = -EPROTO;
	204	goto exit;
	205	}
	206
	207	atr_req = (struct st21nfca_atr_req *)skb->data;
	208
56f1ffcc CR	209	if (atr_req->length < sizeof(struct st21nfca_atr_req)) {
	210	r = -EPROTO;
	211	goto exit;
	212	}
	213
1892bf84 CR	214	r = st21nfca_tm_send_atr_res(hdev, atr_req);
	215	if (r)
	216	goto exit;
	217
	218	gb_len = skb->len - sizeof(struct st21nfca_atr_req);
	219
	220	r = nfc_tm_activated(hdev->ndev, NFC_PROTO_NFC_DEP_MASK,
	221	NFC_COMM_PASSIVE, atr_req->gbi, gb_len);
	222	if (r)
	223	goto exit;
	224
	225	r = 0;
	226
	227	exit:
	228	return r;
	229	}
	230
	231	static int st21nfca_tm_send_psl_res(struct nfc_hci_dev *hdev,
	232	struct st21nfca_psl_req *psl_req)
	233	{
	234	struct st21nfca_psl_res *psl_res;
	235	struct sk_buff *skb;
	236	u8 bitrate[2] = {0, 0};
1892bf84 CR	237	int r;
	238
	239	skb = alloc_skb(sizeof(struct st21nfca_psl_res), GFP_KERNEL);
	240	if (!skb)
	241	return -ENOMEM;
	242	skb_put(skb, sizeof(struct st21nfca_psl_res));
	243
	244	psl_res = (struct st21nfca_psl_res *)skb->data;
	245
	246	psl_res->length = sizeof(struct st21nfca_psl_res);
	247	psl_res->cmd0 = ST21NFCA_NFCIP1_RES;
	248	psl_res->cmd1 = ST21NFCA_NFCIP1_PSL_RES;
	249	psl_res->did = psl_req->did;
	250
	251	r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
	252	ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
ecc6522b CR	253	if (r < 0)
ecc6522b CR	254	goto error;
1892bf84 CR	255
	256	/*
	257	* ST21NFCA only support P2P passive.
	258	* PSL_REQ BRS value != 0 has only a meaning to
	259	* change technology to type F.
	260	* We change to BITRATE 424Kbits.
	261	* In other case switch to BITRATE 106Kbits.
	262	*/
	263	if (ST21NFCA_PSL_REQ_SEND_SPEED(psl_req->brs) &&
	264	ST21NFCA_PSL_REQ_RECV_SPEED(psl_req->brs)) {
	265	bitrate[0] = ST21NFCA_CARD_BITRATE_424;
	266	bitrate[1] = ST21NFCA_CARD_BITRATE_424;
	267	}
	268
	269	/* Send an event to change bitrate change event to card f */
ecc6522b	270	r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
1892bf84	271	ST21NFCA_EVT_CARD_F_BITRATE, bitrate, 2);
ecc6522b CR	272	error:
	273	kfree_skb(skb);
	274	return r;
1892bf84 CR	275	}
	276
	277	static int st21nfca_tm_recv_psl_req(struct nfc_hci_dev *hdev,
	278	struct sk_buff *skb)
	279	{
	280	struct st21nfca_psl_req *psl_req;
	281	int r;
	282
	283	skb_trim(skb, skb->len - 1);
1892bf84 CR	284
	285	if (!skb->len) {
	286	r = -EIO;
	287	goto exit;
	288	}
	289
	290	psl_req = (struct st21nfca_psl_req *)skb->data;
	291
	292	if (skb->len < sizeof(struct st21nfca_psl_req)) {
	293	r = -EIO;
	294	goto exit;
	295	}
	296
	297	r = st21nfca_tm_send_psl_res(hdev, psl_req);
	298	exit:
	299	return r;
	300	}
	301
	302	int st21nfca_tm_send_dep_res(struct nfc_hci_dev hdev, struct sk_buff skb)
	303	{
	304	int r;
	305	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
	306
d58ff351 JB	307	(u8 )skb_push(skb, 1) = info->dep_info.curr_nfc_dep_pni;
	308	(u8 )skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_RES;
	309	(u8 )skb_push(skb, 1) = ST21NFCA_NFCIP1_RES;
	310	(u8 )skb_push(skb, 1) = skb->len;
1892bf84 CR	311
1892bf84 CR	312	r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
cc3faac9	313	ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
1892bf84 CR	314	kfree_skb(skb);
	315
	316	return r;
	317	}
	318	EXPORT_SYMBOL(st21nfca_tm_send_dep_res);
	319
	320	static int st21nfca_tm_recv_dep_req(struct nfc_hci_dev *hdev,
	321	struct sk_buff *skb)
	322	{
	323	struct st21nfca_dep_req_res *dep_req;
	324	u8 size;
	325	int r;
	326	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
	327
	328	skb_trim(skb, skb->len - 1);
1892bf84 CR	329
	330	size = 4;
	331
	332	dep_req = (struct st21nfca_dep_req_res *)skb->data;
	333	if (skb->len < size) {
	334	r = -EIO;
	335	goto exit;
	336	}
	337
	338	if (ST21NFCA_NFC_DEP_DID_BIT_SET(dep_req->pfb))
	339	size++;
	340	if (ST21NFCA_NFC_DEP_NAD_BIT_SET(dep_req->pfb))
	341	size++;
	342
	343	if (skb->len < size) {
	344	r = -EIO;
	345	goto exit;
	346	}
	347
	348	/* Receiving DEP_REQ - Decoding */
	349	switch (ST21NFCA_NFC_DEP_PFB_TYPE(dep_req->pfb)) {
	350	case ST21NFCA_NFC_DEP_PFB_I_PDU:
	351	info->dep_info.curr_nfc_dep_pni =
	352	ST21NFCA_NFC_DEP_PFB_PNI(dep_req->pfb);
	353	break;
	354	case ST21NFCA_NFC_DEP_PFB_ACK_NACK_PDU:
	355	pr_err("Received a ACK/NACK PDU\n");
	356	break;
	357	case ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU:
	358	pr_err("Received a SUPERVISOR PDU\n");
	359	break;
	360	}
	361
1892bf84 CR	362	skb_pull(skb, size);
	363
	364	return nfc_tm_data_received(hdev->ndev, skb);
	365	exit:
	366	return r;
	367	}
	368
a4415e76 CR	369	static int st21nfca_tm_event_send_data(struct nfc_hci_dev *hdev,
a4415e76 CR	370	struct sk_buff *skb)
1892bf84 CR	371	{
	372	u8 cmd0, cmd1;
	373	int r;
	374
	375	cmd0 = skb->data[1];
	376	switch (cmd0) {
	377	case ST21NFCA_NFCIP1_REQ:
	378	cmd1 = skb->data[2];
	379	switch (cmd1) {
	380	case ST21NFCA_NFCIP1_ATR_REQ:
	381	r = st21nfca_tm_recv_atr_req(hdev, skb);
	382	break;
	383	case ST21NFCA_NFCIP1_PSL_REQ:
	384	r = st21nfca_tm_recv_psl_req(hdev, skb);
	385	break;
	386	case ST21NFCA_NFCIP1_DEP_REQ:
	387	r = st21nfca_tm_recv_dep_req(hdev, skb);
	388	break;
	389	default:
	390	return 1;
	391	}
a01bcfd6	392	break;
1892bf84 CR	393	default:
	394	return 1;
	395	}
	396	return r;
	397	}
a4415e76 CR	398
	399	/*
	400	* Returns:
	401	* <= 0: driver handled the event, skb consumed
	402	* 1: driver does not handle the event, please do standard processing
	403	*/
	404	int st21nfca_dep_event_received(struct nfc_hci_dev *hdev,
	405	u8 event, struct sk_buff *skb)
	406	{
	407	int r = 0;
	408	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
	409
	410	pr_debug("dep event: %d\n", event);
	411
	412	switch (event) {
	413	case ST21NFCA_EVT_CARD_ACTIVATED:
	414	info->dep_info.curr_nfc_dep_pni = 0;
	415	break;
	416	case ST21NFCA_EVT_CARD_DEACTIVATED:
	417	break;
	418	case ST21NFCA_EVT_FIELD_ON:
	419	break;
	420	case ST21NFCA_EVT_FIELD_OFF:
	421	break;
	422	case ST21NFCA_EVT_SEND_DATA:
	423	r = st21nfca_tm_event_send_data(hdev, skb);
	424	if (r < 0)
	425	return r;
	426	return 0;
	427	default:
a9e062d0	428	nfc_err(&hdev->ndev->dev, "Unexpected event on card f gate\n");
a4415e76 CR	429	return 1;
	430	}
	431	kfree_skb(skb);
	432	return r;
	433	}
	434	EXPORT_SYMBOL(st21nfca_dep_event_received);
1892bf84 CR	435
	436	static void st21nfca_im_send_psl_req(struct nfc_hci_dev *hdev, u8 did, u8 bsi,
	437	u8 bri, u8 lri)
	438	{
	439	struct sk_buff *skb;
	440	struct st21nfca_psl_req *psl_req;
	441	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
	442
	443	skb =
	444	alloc_skb(sizeof(struct st21nfca_psl_req) + 1, GFP_KERNEL);
	445	if (!skb)
	446	return;
	447	skb_reserve(skb, 1);
	448
	449	skb_put(skb, sizeof(struct st21nfca_psl_req));
	450	psl_req = (struct st21nfca_psl_req *) skb->data;
	451
	452	psl_req->length = sizeof(struct st21nfca_psl_req);
	453	psl_req->cmd0 = ST21NFCA_NFCIP1_REQ;
	454	psl_req->cmd1 = ST21NFCA_NFCIP1_PSL_REQ;
	455	psl_req->did = did;
	456	psl_req->brs = (0x30 & bsi << 4) \| (bri & 0x03);
	457	psl_req->fsl = lri;
	458
d58ff351	459	(u8 )skb_push(skb, 1) = info->dep_info.to \| 0x10;
1892bf84 CR	460
1892bf84 CR	461	st21nfca_im_send_pdu(info, skb);
1892bf84 CR	462	}
	463
	464	#define ST21NFCA_CB_TYPE_READER_F 1
	465	static void st21nfca_im_recv_atr_res_cb(void context, struct sk_buff skb,
	466	int err)
	467	{
	468	struct st21nfca_hci_info *info = context;
	469	struct st21nfca_atr_res *atr_res;
	470	int r;
	471
	472	if (err != 0)
	473	return;
	474
459e794b	475	if (!skb)
1892bf84 CR	476	return;
	477
	478	switch (info->async_cb_type) {
	479	case ST21NFCA_CB_TYPE_READER_F:
	480	skb_trim(skb, skb->len - 1);
	481	atr_res = (struct st21nfca_atr_res *)skb->data;
	482	r = nfc_set_remote_general_bytes(info->hdev->ndev,
	483	atr_res->gbi,
	484	skb->len - sizeof(struct st21nfca_atr_res));
	485	if (r < 0)
	486	return;
	487
	488	if (atr_res->to >= 0x0e)
	489	info->dep_info.to = 0x0e;
	490	else
	491	info->dep_info.to = atr_res->to + 1;
	492
	493	info->dep_info.to \|= 0x10;
	494
	495	r = nfc_dep_link_is_up(info->hdev->ndev, info->dep_info.idx,
	496	NFC_COMM_PASSIVE, NFC_RF_INITIATOR);
	497	if (r < 0)
	498	return;
	499
	500	info->dep_info.curr_nfc_dep_pni = 0;
	501	if (ST21NFCA_PP2LRI(atr_res->ppi) != info->dep_info.lri)
	502	st21nfca_im_send_psl_req(info->hdev, atr_res->did,
	503	atr_res->bsi, atr_res->bri,
	504	ST21NFCA_PP2LRI(atr_res->ppi));
	505	break;
	506	default:
32b41d8f	507	kfree_skb(skb);
1892bf84 CR	508	break;
	509	}
	510	}
	511
	512	int st21nfca_im_send_atr_req(struct nfc_hci_dev hdev, u8 gb, size_t gb_len)
	513	{
	514	struct sk_buff *skb;
	515	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
	516	struct st21nfca_atr_req *atr_req;
	517	struct nfc_target *target;
	518	uint size;
	519
	520	info->dep_info.to = ST21NFCA_DEFAULT_TIMEOUT;
	521	size = ST21NFCA_ATR_REQ_MIN_SIZE + gb_len;
	522	if (size > ST21NFCA_ATR_REQ_MAX_SIZE) {
	523	PROTOCOL_ERR("14.6.1.1");
	524	return -EINVAL;
	525	}
	526
	527	skb =
	528	alloc_skb(sizeof(struct st21nfca_atr_req) + gb_len + 1, GFP_KERNEL);
	529	if (!skb)
	530	return -ENOMEM;
	531
	532	skb_reserve(skb, 1);
	533
	534	skb_put(skb, sizeof(struct st21nfca_atr_req));
	535
	536	atr_req = (struct st21nfca_atr_req *)skb->data;
	537	memset(atr_req, 0, sizeof(struct st21nfca_atr_req));
	538
	539	atr_req->cmd0 = ST21NFCA_NFCIP1_REQ;
	540	atr_req->cmd1 = ST21NFCA_NFCIP1_ATR_REQ;
	541	memset(atr_req->nfcid3, 0, NFC_NFCID3_MAXSIZE);
	542	target = hdev->ndev->targets;
	543
72030a2e	544	if (target->sensf_res_len > 0)
1892bf84 CR	545	memcpy(atr_req->nfcid3, target->sensf_res,
	546	target->sensf_res_len);
	547	else
	548	get_random_bytes(atr_req->nfcid3, NFC_NFCID3_MAXSIZE);
	549
	550	atr_req->did = 0x0;
	551
	552	atr_req->bsi = 0x00;
	553	atr_req->bri = 0x00;
	554	atr_req->ppi = ST21NFCA_LR_BITS_PAYLOAD_SIZE_254B;
	555	if (gb_len) {
	556	atr_req->ppi \|= ST21NFCA_GB_BIT;
59ae1d12	557	skb_put_data(skb, gb, gb_len);
1892bf84 CR	558	}
	559	atr_req->length = sizeof(struct st21nfca_atr_req) + hdev->gb_len;
	560
d58ff351	561	(u8 )skb_push(skb, 1) = info->dep_info.to \| 0x10; /* timeout */
1892bf84 CR	562
	563	info->async_cb_type = ST21NFCA_CB_TYPE_READER_F;
	564	info->async_cb_context = info;
	565	info->async_cb = st21nfca_im_recv_atr_res_cb;
	566	info->dep_info.bri = atr_req->bri;
	567	info->dep_info.bsi = atr_req->bsi;
	568	info->dep_info.lri = ST21NFCA_PP2LRI(atr_req->ppi);
	569
	570	return nfc_hci_send_cmd_async(hdev, ST21NFCA_RF_READER_F_GATE,
	571	ST21NFCA_WR_XCHG_DATA, skb->data,
	572	skb->len, info->async_cb, info);
	573	}
	574	EXPORT_SYMBOL(st21nfca_im_send_atr_req);
	575
	576	static void st21nfca_im_recv_dep_res_cb(void context, struct sk_buff skb,
	577	int err)
	578	{
	579	struct st21nfca_hci_info *info = context;
	580	struct st21nfca_dep_req_res *dep_res;
	581
	582	int size;
	583
	584	if (err != 0)
	585	return;
	586
459e794b	587	if (!skb)
1892bf84 CR	588	return;
	589
	590	switch (info->async_cb_type) {
	591	case ST21NFCA_CB_TYPE_READER_F:
	592	dep_res = (struct st21nfca_dep_req_res *)skb->data;
	593
	594	size = 3;
	595	if (skb->len < size)
	596	goto exit;
	597
	598	if (ST21NFCA_NFC_DEP_DID_BIT_SET(dep_res->pfb))
	599	size++;
	600	if (ST21NFCA_NFC_DEP_NAD_BIT_SET(dep_res->pfb))
	601	size++;
	602
	603	if (skb->len < size)
	604	goto exit;
	605
	606	skb_trim(skb, skb->len - 1);
	607
	608	/* Receiving DEP_REQ - Decoding */
	609	switch (ST21NFCA_NFC_DEP_PFB_TYPE(dep_res->pfb)) {
	610	case ST21NFCA_NFC_DEP_PFB_ACK_NACK_PDU:
	611	pr_err("Received a ACK/NACK PDU\n");
a01bcfd6	612	/* fall through */
1892bf84 CR	613	case ST21NFCA_NFC_DEP_PFB_I_PDU:
	614	info->dep_info.curr_nfc_dep_pni =
	615	ST21NFCA_NFC_DEP_PFB_PNI(dep_res->pfb + 1);
	616	size++;
	617	skb_pull(skb, size);
	618	nfc_tm_data_received(info->hdev->ndev, skb);
	619	break;
	620	case ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU:
	621	pr_err("Received a SUPERVISOR PDU\n");
	622	skb_pull(skb, size);
d58ff351 JB	623	(u8 )skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_REQ;
	624	(u8 )skb_push(skb, 1) = ST21NFCA_NFCIP1_REQ;
	625	(u8 )skb_push(skb, 1) = skb->len;
	626	(u8 )skb_push(skb, 1) = info->dep_info.to \| 0x10;
1892bf84 CR	627
	628	st21nfca_im_send_pdu(info, skb);
	629	break;
	630	}
	631
	632	return;
	633	default:
	634	break;
	635	}
	636
	637	exit:
32b41d8f	638	kfree_skb(skb);
1892bf84 CR	639	}
	640
	641	int st21nfca_im_send_dep_req(struct nfc_hci_dev hdev, struct sk_buff skb)
	642	{
	643	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
	644
	645	info->async_cb_type = ST21NFCA_CB_TYPE_READER_F;
	646	info->async_cb_context = info;
	647	info->async_cb = st21nfca_im_recv_dep_res_cb;
	648
d58ff351 JB	649	(u8 )skb_push(skb, 1) = info->dep_info.curr_nfc_dep_pni;
	650	(u8 )skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_REQ;
	651	(u8 )skb_push(skb, 1) = ST21NFCA_NFCIP1_REQ;
	652	(u8 )skb_push(skb, 1) = skb->len;
1892bf84	653
d58ff351	654	(u8 )skb_push(skb, 1) = info->dep_info.to \| 0x10;
1892bf84 CR	655
	656	return nfc_hci_send_cmd_async(hdev, ST21NFCA_RF_READER_F_GATE,
	657	ST21NFCA_WR_XCHG_DATA,
	658	skb->data, skb->len,
	659	info->async_cb, info);
	660	}
	661	EXPORT_SYMBOL(st21nfca_im_send_dep_req);
	662
	663	void st21nfca_dep_init(struct nfc_hci_dev *hdev)
	664	{
	665	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
	666
	667	INIT_WORK(&info->dep_info.tx_work, st21nfca_tx_work);
	668	info->dep_info.curr_nfc_dep_pni = 0;
	669	info->dep_info.idx = 0;
	670	info->dep_info.to = ST21NFCA_DEFAULT_TIMEOUT;
	671	}
	672	EXPORT_SYMBOL(st21nfca_dep_init);
	673
	674	void st21nfca_dep_deinit(struct nfc_hci_dev *hdev)
	675	{
	676	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
	677
	678	cancel_work_sync(&info->dep_info.tx_work);
	679	}
	680	EXPORT_SYMBOL(st21nfca_dep_deinit);