[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[];
} __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[];
} __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) {
			kfree_skb(skb);
			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");
			fallthrough;
		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;
da60fbe7	69	u8 gbi[];
1892bf84 CR	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;
da60fbe7	82	u8 gbi[];
1892bf84 CR	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);
3decabdc CY	176	if (r < 0) {
3decabdc CY	177	kfree_skb(skb);
1892bf84	178	return r;
3decabdc	179	}
1892bf84 CR	180	}
	181
	182	info->dep_info.curr_nfc_dep_pni = 0;
	183
ecc6522b	184	r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
1892bf84	185	ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
ecc6522b CR	186	kfree_skb(skb);
ecc6522b CR	187	return r;
1892bf84 CR	188	}
	189
	190	static int st21nfca_tm_recv_atr_req(struct nfc_hci_dev *hdev,
	191	struct sk_buff *skb)
	192	{
	193	struct st21nfca_atr_req *atr_req;
	194	size_t gb_len;
	195	int r;
	196
	197	skb_trim(skb, skb->len - 1);
1892bf84 CR	198
	199	if (!skb->len) {
	200	r = -EIO;
	201	goto exit;
	202	}
	203
	204	if (skb->len < ST21NFCA_ATR_REQ_MIN_SIZE) {
	205	r = -EPROTO;
	206	goto exit;
	207	}
	208
	209	atr_req = (struct st21nfca_atr_req *)skb->data;
	210
56f1ffcc CR	211	if (atr_req->length < sizeof(struct st21nfca_atr_req)) {
	212	r = -EPROTO;
	213	goto exit;
	214	}
	215
1892bf84 CR	216	r = st21nfca_tm_send_atr_res(hdev, atr_req);
	217	if (r)
	218	goto exit;
	219
	220	gb_len = skb->len - sizeof(struct st21nfca_atr_req);
	221
	222	r = nfc_tm_activated(hdev->ndev, NFC_PROTO_NFC_DEP_MASK,
	223	NFC_COMM_PASSIVE, atr_req->gbi, gb_len);
	224	if (r)
	225	goto exit;
	226
	227	r = 0;
	228
	229	exit:
	230	return r;
	231	}
	232
	233	static int st21nfca_tm_send_psl_res(struct nfc_hci_dev *hdev,
	234	struct st21nfca_psl_req *psl_req)
	235	{
	236	struct st21nfca_psl_res *psl_res;
	237	struct sk_buff *skb;
	238	u8 bitrate[2] = {0, 0};
1892bf84 CR	239	int r;
	240
	241	skb = alloc_skb(sizeof(struct st21nfca_psl_res), GFP_KERNEL);
	242	if (!skb)
	243	return -ENOMEM;
	244	skb_put(skb, sizeof(struct st21nfca_psl_res));
	245
	246	psl_res = (struct st21nfca_psl_res *)skb->data;
	247
	248	psl_res->length = sizeof(struct st21nfca_psl_res);
	249	psl_res->cmd0 = ST21NFCA_NFCIP1_RES;
	250	psl_res->cmd1 = ST21NFCA_NFCIP1_PSL_RES;
	251	psl_res->did = psl_req->did;
	252
	253	r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
	254	ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
ecc6522b CR	255	if (r < 0)
ecc6522b CR	256	goto error;
1892bf84 CR	257
	258	/*
	259	* ST21NFCA only support P2P passive.
	260	* PSL_REQ BRS value != 0 has only a meaning to
	261	* change technology to type F.
	262	* We change to BITRATE 424Kbits.
	263	* In other case switch to BITRATE 106Kbits.
	264	*/
	265	if (ST21NFCA_PSL_REQ_SEND_SPEED(psl_req->brs) &&
	266	ST21NFCA_PSL_REQ_RECV_SPEED(psl_req->brs)) {
	267	bitrate[0] = ST21NFCA_CARD_BITRATE_424;
	268	bitrate[1] = ST21NFCA_CARD_BITRATE_424;
	269	}
	270
	271	/* Send an event to change bitrate change event to card f */
ecc6522b	272	r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
1892bf84	273	ST21NFCA_EVT_CARD_F_BITRATE, bitrate, 2);
ecc6522b CR	274	error:
	275	kfree_skb(skb);
	276	return r;
1892bf84 CR	277	}
	278
	279	static int st21nfca_tm_recv_psl_req(struct nfc_hci_dev *hdev,
	280	struct sk_buff *skb)
	281	{
	282	struct st21nfca_psl_req *psl_req;
	283	int r;
	284
	285	skb_trim(skb, skb->len - 1);
1892bf84 CR	286
	287	if (!skb->len) {
	288	r = -EIO;
	289	goto exit;
	290	}
	291
	292	psl_req = (struct st21nfca_psl_req *)skb->data;
	293
	294	if (skb->len < sizeof(struct st21nfca_psl_req)) {
	295	r = -EIO;
	296	goto exit;
	297	}
	298
	299	r = st21nfca_tm_send_psl_res(hdev, psl_req);
	300	exit:
	301	return r;
	302	}
	303
	304	int st21nfca_tm_send_dep_res(struct nfc_hci_dev hdev, struct sk_buff skb)
	305	{
	306	int r;
	307	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
	308
d58ff351 JB	309	(u8 )skb_push(skb, 1) = info->dep_info.curr_nfc_dep_pni;
	310	(u8 )skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_RES;
	311	(u8 )skb_push(skb, 1) = ST21NFCA_NFCIP1_RES;
	312	(u8 )skb_push(skb, 1) = skb->len;
1892bf84 CR	313
1892bf84 CR	314	r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
cc3faac9	315	ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
1892bf84 CR	316	kfree_skb(skb);
	317
	318	return r;
	319	}
	320	EXPORT_SYMBOL(st21nfca_tm_send_dep_res);
	321
	322	static int st21nfca_tm_recv_dep_req(struct nfc_hci_dev *hdev,
	323	struct sk_buff *skb)
	324	{
	325	struct st21nfca_dep_req_res *dep_req;
	326	u8 size;
	327	int r;
	328	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
	329
	330	skb_trim(skb, skb->len - 1);
1892bf84 CR	331
	332	size = 4;
	333
	334	dep_req = (struct st21nfca_dep_req_res *)skb->data;
	335	if (skb->len < size) {
	336	r = -EIO;
	337	goto exit;
	338	}
	339
	340	if (ST21NFCA_NFC_DEP_DID_BIT_SET(dep_req->pfb))
	341	size++;
	342	if (ST21NFCA_NFC_DEP_NAD_BIT_SET(dep_req->pfb))
	343	size++;
	344
	345	if (skb->len < size) {
	346	r = -EIO;
	347	goto exit;
	348	}
	349
	350	/* Receiving DEP_REQ - Decoding */
	351	switch (ST21NFCA_NFC_DEP_PFB_TYPE(dep_req->pfb)) {
	352	case ST21NFCA_NFC_DEP_PFB_I_PDU:
	353	info->dep_info.curr_nfc_dep_pni =
	354	ST21NFCA_NFC_DEP_PFB_PNI(dep_req->pfb);
	355	break;
	356	case ST21NFCA_NFC_DEP_PFB_ACK_NACK_PDU:
	357	pr_err("Received a ACK/NACK PDU\n");
	358	break;
	359	case ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU:
	360	pr_err("Received a SUPERVISOR PDU\n");
	361	break;
	362	}
	363
1892bf84 CR	364	skb_pull(skb, size);
	365
	366	return nfc_tm_data_received(hdev->ndev, skb);
	367	exit:
	368	return r;
	369	}
	370
a4415e76 CR	371	static int st21nfca_tm_event_send_data(struct nfc_hci_dev *hdev,
a4415e76 CR	372	struct sk_buff *skb)
1892bf84 CR	373	{
	374	u8 cmd0, cmd1;
	375	int r;
	376
	377	cmd0 = skb->data[1];
	378	switch (cmd0) {
	379	case ST21NFCA_NFCIP1_REQ:
	380	cmd1 = skb->data[2];
	381	switch (cmd1) {
	382	case ST21NFCA_NFCIP1_ATR_REQ:
	383	r = st21nfca_tm_recv_atr_req(hdev, skb);
	384	break;
	385	case ST21NFCA_NFCIP1_PSL_REQ:
	386	r = st21nfca_tm_recv_psl_req(hdev, skb);
	387	break;
	388	case ST21NFCA_NFCIP1_DEP_REQ:
	389	r = st21nfca_tm_recv_dep_req(hdev, skb);
	390	break;
	391	default:
	392	return 1;
	393	}
a01bcfd6	394	break;
1892bf84 CR	395	default:
	396	return 1;
	397	}
	398	return r;
	399	}
a4415e76 CR	400
	401	/*
	402	* Returns:
	403	* <= 0: driver handled the event, skb consumed
	404	* 1: driver does not handle the event, please do standard processing
	405	*/
	406	int st21nfca_dep_event_received(struct nfc_hci_dev *hdev,
	407	u8 event, struct sk_buff *skb)
	408	{
	409	int r = 0;
	410	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
	411
	412	pr_debug("dep event: %d\n", event);
	413
	414	switch (event) {
	415	case ST21NFCA_EVT_CARD_ACTIVATED:
	416	info->dep_info.curr_nfc_dep_pni = 0;
	417	break;
	418	case ST21NFCA_EVT_CARD_DEACTIVATED:
	419	break;
	420	case ST21NFCA_EVT_FIELD_ON:
	421	break;
	422	case ST21NFCA_EVT_FIELD_OFF:
	423	break;
	424	case ST21NFCA_EVT_SEND_DATA:
	425	r = st21nfca_tm_event_send_data(hdev, skb);
	426	if (r < 0)
	427	return r;
	428	return 0;
	429	default:
a9e062d0	430	nfc_err(&hdev->ndev->dev, "Unexpected event on card f gate\n");
a4415e76 CR	431	return 1;
	432	}
	433	kfree_skb(skb);
	434	return r;
	435	}
	436	EXPORT_SYMBOL(st21nfca_dep_event_received);
1892bf84 CR	437
	438	static void st21nfca_im_send_psl_req(struct nfc_hci_dev *hdev, u8 did, u8 bsi,
	439	u8 bri, u8 lri)
	440	{
	441	struct sk_buff *skb;
	442	struct st21nfca_psl_req *psl_req;
	443	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
	444
	445	skb =
	446	alloc_skb(sizeof(struct st21nfca_psl_req) + 1, GFP_KERNEL);
	447	if (!skb)
	448	return;
	449	skb_reserve(skb, 1);
	450
	451	skb_put(skb, sizeof(struct st21nfca_psl_req));
	452	psl_req = (struct st21nfca_psl_req *) skb->data;
	453
	454	psl_req->length = sizeof(struct st21nfca_psl_req);
	455	psl_req->cmd0 = ST21NFCA_NFCIP1_REQ;
	456	psl_req->cmd1 = ST21NFCA_NFCIP1_PSL_REQ;
	457	psl_req->did = did;
	458	psl_req->brs = (0x30 & bsi << 4) \| (bri & 0x03);
	459	psl_req->fsl = lri;
	460
d58ff351	461	(u8 )skb_push(skb, 1) = info->dep_info.to \| 0x10;
1892bf84 CR	462
1892bf84 CR	463	st21nfca_im_send_pdu(info, skb);
1892bf84 CR	464	}
	465
	466	#define ST21NFCA_CB_TYPE_READER_F 1
	467	static void st21nfca_im_recv_atr_res_cb(void context, struct sk_buff skb,
	468	int err)
	469	{
	470	struct st21nfca_hci_info *info = context;
	471	struct st21nfca_atr_res *atr_res;
	472	int r;
	473
	474	if (err != 0)
	475	return;
	476
459e794b	477	if (!skb)
1892bf84 CR	478	return;
	479
	480	switch (info->async_cb_type) {
	481	case ST21NFCA_CB_TYPE_READER_F:
	482	skb_trim(skb, skb->len - 1);
	483	atr_res = (struct st21nfca_atr_res *)skb->data;
	484	r = nfc_set_remote_general_bytes(info->hdev->ndev,
	485	atr_res->gbi,
	486	skb->len - sizeof(struct st21nfca_atr_res));
	487	if (r < 0)
	488	return;
	489
	490	if (atr_res->to >= 0x0e)
	491	info->dep_info.to = 0x0e;
	492	else
	493	info->dep_info.to = atr_res->to + 1;
	494
	495	info->dep_info.to \|= 0x10;
	496
	497	r = nfc_dep_link_is_up(info->hdev->ndev, info->dep_info.idx,
	498	NFC_COMM_PASSIVE, NFC_RF_INITIATOR);
	499	if (r < 0)
	500	return;
	501
	502	info->dep_info.curr_nfc_dep_pni = 0;
	503	if (ST21NFCA_PP2LRI(atr_res->ppi) != info->dep_info.lri)
	504	st21nfca_im_send_psl_req(info->hdev, atr_res->did,
	505	atr_res->bsi, atr_res->bri,
	506	ST21NFCA_PP2LRI(atr_res->ppi));
	507	break;
	508	default:
32b41d8f	509	kfree_skb(skb);
1892bf84 CR	510	break;
	511	}
	512	}
	513
	514	int st21nfca_im_send_atr_req(struct nfc_hci_dev hdev, u8 gb, size_t gb_len)
	515	{
	516	struct sk_buff *skb;
	517	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
	518	struct st21nfca_atr_req *atr_req;
	519	struct nfc_target *target;
	520	uint size;
	521
	522	info->dep_info.to = ST21NFCA_DEFAULT_TIMEOUT;
	523	size = ST21NFCA_ATR_REQ_MIN_SIZE + gb_len;
	524	if (size > ST21NFCA_ATR_REQ_MAX_SIZE) {
	525	PROTOCOL_ERR("14.6.1.1");
	526	return -EINVAL;
	527	}
	528
	529	skb =
	530	alloc_skb(sizeof(struct st21nfca_atr_req) + gb_len + 1, GFP_KERNEL);
	531	if (!skb)
	532	return -ENOMEM;
	533
	534	skb_reserve(skb, 1);
	535
	536	skb_put(skb, sizeof(struct st21nfca_atr_req));
	537
	538	atr_req = (struct st21nfca_atr_req *)skb->data;
	539	memset(atr_req, 0, sizeof(struct st21nfca_atr_req));
	540
	541	atr_req->cmd0 = ST21NFCA_NFCIP1_REQ;
	542	atr_req->cmd1 = ST21NFCA_NFCIP1_ATR_REQ;
	543	memset(atr_req->nfcid3, 0, NFC_NFCID3_MAXSIZE);
	544	target = hdev->ndev->targets;
	545
72030a2e	546	if (target->sensf_res_len > 0)
1892bf84 CR	547	memcpy(atr_req->nfcid3, target->sensf_res,
	548	target->sensf_res_len);
	549	else
	550	get_random_bytes(atr_req->nfcid3, NFC_NFCID3_MAXSIZE);
	551
	552	atr_req->did = 0x0;
	553
	554	atr_req->bsi = 0x00;
	555	atr_req->bri = 0x00;
	556	atr_req->ppi = ST21NFCA_LR_BITS_PAYLOAD_SIZE_254B;
	557	if (gb_len) {
	558	atr_req->ppi \|= ST21NFCA_GB_BIT;
59ae1d12	559	skb_put_data(skb, gb, gb_len);
1892bf84 CR	560	}
	561	atr_req->length = sizeof(struct st21nfca_atr_req) + hdev->gb_len;
	562
d58ff351	563	(u8 )skb_push(skb, 1) = info->dep_info.to \| 0x10; /* timeout */
1892bf84 CR	564
	565	info->async_cb_type = ST21NFCA_CB_TYPE_READER_F;
	566	info->async_cb_context = info;
	567	info->async_cb = st21nfca_im_recv_atr_res_cb;
	568	info->dep_info.bri = atr_req->bri;
	569	info->dep_info.bsi = atr_req->bsi;
	570	info->dep_info.lri = ST21NFCA_PP2LRI(atr_req->ppi);
	571
	572	return nfc_hci_send_cmd_async(hdev, ST21NFCA_RF_READER_F_GATE,
	573	ST21NFCA_WR_XCHG_DATA, skb->data,
	574	skb->len, info->async_cb, info);
	575	}
	576	EXPORT_SYMBOL(st21nfca_im_send_atr_req);
	577
	578	static void st21nfca_im_recv_dep_res_cb(void context, struct sk_buff skb,
	579	int err)
	580	{
	581	struct st21nfca_hci_info *info = context;
	582	struct st21nfca_dep_req_res *dep_res;
	583
	584	int size;
	585
	586	if (err != 0)
	587	return;
	588
459e794b	589	if (!skb)
1892bf84 CR	590	return;
	591
	592	switch (info->async_cb_type) {
	593	case ST21NFCA_CB_TYPE_READER_F:
	594	dep_res = (struct st21nfca_dep_req_res *)skb->data;
	595
	596	size = 3;
	597	if (skb->len < size)
	598	goto exit;
	599
	600	if (ST21NFCA_NFC_DEP_DID_BIT_SET(dep_res->pfb))
	601	size++;
	602	if (ST21NFCA_NFC_DEP_NAD_BIT_SET(dep_res->pfb))
	603	size++;
	604
	605	if (skb->len < size)
	606	goto exit;
	607
	608	skb_trim(skb, skb->len - 1);
	609
	610	/* Receiving DEP_REQ - Decoding */
	611	switch (ST21NFCA_NFC_DEP_PFB_TYPE(dep_res->pfb)) {
	612	case ST21NFCA_NFC_DEP_PFB_ACK_NACK_PDU:
	613	pr_err("Received a ACK/NACK PDU\n");
df561f66	614	fallthrough;
1892bf84 CR	615	case ST21NFCA_NFC_DEP_PFB_I_PDU:
	616	info->dep_info.curr_nfc_dep_pni =
	617	ST21NFCA_NFC_DEP_PFB_PNI(dep_res->pfb + 1);
	618	size++;
	619	skb_pull(skb, size);
	620	nfc_tm_data_received(info->hdev->ndev, skb);
	621	break;
	622	case ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU:
	623	pr_err("Received a SUPERVISOR PDU\n");
	624	skb_pull(skb, size);
d58ff351 JB	625	(u8 )skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_REQ;
	626	(u8 )skb_push(skb, 1) = ST21NFCA_NFCIP1_REQ;
	627	(u8 )skb_push(skb, 1) = skb->len;
	628	(u8 )skb_push(skb, 1) = info->dep_info.to \| 0x10;
1892bf84 CR	629
	630	st21nfca_im_send_pdu(info, skb);
	631	break;
	632	}
	633
	634	return;
	635	default:
	636	break;
	637	}
	638
	639	exit:
32b41d8f	640	kfree_skb(skb);
1892bf84 CR	641	}
	642
	643	int st21nfca_im_send_dep_req(struct nfc_hci_dev hdev, struct sk_buff skb)
	644	{
	645	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
	646
	647	info->async_cb_type = ST21NFCA_CB_TYPE_READER_F;
	648	info->async_cb_context = info;
	649	info->async_cb = st21nfca_im_recv_dep_res_cb;
	650
d58ff351 JB	651	(u8 )skb_push(skb, 1) = info->dep_info.curr_nfc_dep_pni;
	652	(u8 )skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_REQ;
	653	(u8 )skb_push(skb, 1) = ST21NFCA_NFCIP1_REQ;
	654	(u8 )skb_push(skb, 1) = skb->len;
1892bf84	655
d58ff351	656	(u8 )skb_push(skb, 1) = info->dep_info.to \| 0x10;
1892bf84 CR	657
	658	return nfc_hci_send_cmd_async(hdev, ST21NFCA_RF_READER_F_GATE,
	659	ST21NFCA_WR_XCHG_DATA,
	660	skb->data, skb->len,
	661	info->async_cb, info);
	662	}
	663	EXPORT_SYMBOL(st21nfca_im_send_dep_req);
	664
	665	void st21nfca_dep_init(struct nfc_hci_dev *hdev)
	666	{
	667	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
	668
	669	INIT_WORK(&info->dep_info.tx_work, st21nfca_tx_work);
	670	info->dep_info.curr_nfc_dep_pni = 0;
	671	info->dep_info.idx = 0;
	672	info->dep_info.to = ST21NFCA_DEFAULT_TIMEOUT;
	673	}
	674	EXPORT_SYMBOL(st21nfca_dep_init);
	675
	676	void st21nfca_dep_deinit(struct nfc_hci_dev *hdev)
	677	{
	678	struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
	679
	680	cancel_work_sync(&info->dep_info.tx_work);
	681	}
	682	EXPORT_SYMBOL(st21nfca_dep_deinit);