digital_technology.c 26.9 KB
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/*
 * NFC Digital Protocol stack
 * Copyright (c) 2013, Intel Corporation.
 *
 * 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 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.
 *
 */

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#define pr_fmt(fmt) "digital: %s: " fmt, __func__

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#include "digital.h"

#define DIGITAL_CMD_SENS_REQ    0x26
#define DIGITAL_CMD_ALL_REQ     0x52
#define DIGITAL_CMD_SEL_REQ_CL1 0x93
#define DIGITAL_CMD_SEL_REQ_CL2 0x95
#define DIGITAL_CMD_SEL_REQ_CL3 0x97

#define DIGITAL_SDD_REQ_SEL_PAR 0x20

#define DIGITAL_SDD_RES_CT  0x88
#define DIGITAL_SDD_RES_LEN 5

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#define DIGITAL_SEL_RES_NFCID1_COMPLETE(sel_res) (!((sel_res) & 0x04))
#define DIGITAL_SEL_RES_IS_T2T(sel_res) (!((sel_res) & 0x60))
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#define DIGITAL_SEL_RES_IS_T4T(sel_res) ((sel_res) & 0x20)
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#define DIGITAL_SEL_RES_IS_NFC_DEP(sel_res) ((sel_res) & 0x40)
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#define DIGITAL_SENS_RES_IS_T1T(sens_res) (((sens_res) & 0x0C00) == 0x0C00)
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#define DIGITAL_SENS_RES_IS_VALID(sens_res) \
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	((!((sens_res) & 0x001F) && (((sens_res) & 0x0C00) == 0x0C00)) || \
	(((sens_res) & 0x001F) && ((sens_res) & 0x0C00) != 0x0C00))
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#define DIGITAL_MIFARE_READ_RES_LEN 16
#define DIGITAL_MIFARE_ACK_RES	0x0A

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#define DIGITAL_CMD_SENSB_REQ			0x05
#define DIGITAL_SENSB_ADVANCED			BIT(5)
#define DIGITAL_SENSB_EXTENDED			BIT(4)
#define DIGITAL_SENSB_ALLB_REQ			BIT(3)
#define DIGITAL_SENSB_N(n)			((n) & 0x7)

#define DIGITAL_CMD_SENSB_RES			0x50

#define DIGITAL_CMD_ATTRIB_REQ			0x1D
#define DIGITAL_ATTRIB_P1_TR0_DEFAULT		(0x0 << 6)
#define DIGITAL_ATTRIB_P1_TR1_DEFAULT		(0x0 << 4)
#define DIGITAL_ATTRIB_P1_SUPRESS_EOS		BIT(3)
#define DIGITAL_ATTRIB_P1_SUPRESS_SOS		BIT(2)
#define DIGITAL_ATTRIB_P2_LISTEN_POLL_1		(0x0 << 6)
#define DIGITAL_ATTRIB_P2_POLL_LISTEN_1		(0x0 << 4)
#define DIGITAL_ATTRIB_P2_MAX_FRAME_256		0x8
#define DIGITAL_ATTRIB_P4_DID(n)		((n) & 0xf)

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#define DIGITAL_CMD_SENSF_REQ	0x00
#define DIGITAL_CMD_SENSF_RES	0x01

#define DIGITAL_SENSF_RES_MIN_LENGTH 17
#define DIGITAL_SENSF_RES_RD_AP_B1   0x00
#define DIGITAL_SENSF_RES_RD_AP_B2   0x8F

#define DIGITAL_SENSF_REQ_RC_NONE 0
#define DIGITAL_SENSF_REQ_RC_SC   1
#define DIGITAL_SENSF_REQ_RC_AP   2

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#define DIGITAL_CMD_ISO15693_INVENTORY_REQ	0x01

#define DIGITAL_ISO15693_REQ_FLAG_DATA_RATE	BIT(1)
#define DIGITAL_ISO15693_REQ_FLAG_INVENTORY	BIT(2)
#define DIGITAL_ISO15693_REQ_FLAG_NB_SLOTS	BIT(5)
#define DIGITAL_ISO15693_RES_FLAG_ERROR		BIT(0)
#define DIGITAL_ISO15693_RES_IS_VALID(flags) \
	(!((flags) & DIGITAL_ISO15693_RES_FLAG_ERROR))

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#define DIGITAL_ISO_DEP_I_PCB	 0x02
#define DIGITAL_ISO_DEP_PNI(pni) ((pni) & 0x01)

#define DIGITAL_ISO_DEP_PCB_TYPE(pcb) ((pcb) & 0xC0)

#define DIGITAL_ISO_DEP_I_BLOCK 0x00

#define DIGITAL_ISO_DEP_BLOCK_HAS_DID(pcb) ((pcb) & 0x08)

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static const u8 digital_ats_fsc[] = {
	 16,  24,  32,  40,  48,  64,  96, 128,
};

#define DIGITAL_ATS_FSCI(t0) ((t0) & 0x0F)
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#define DIGITAL_SENSB_FSCI(pi2) (((pi2) & 0xF0) >> 4)
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#define DIGITAL_ATS_MAX_FSC  256

#define DIGITAL_RATS_BYTE1 0xE0
#define DIGITAL_RATS_PARAM 0x80

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struct digital_sdd_res {
	u8 nfcid1[4];
	u8 bcc;
} __packed;

struct digital_sel_req {
	u8 sel_cmd;
	u8 b2;
	u8 nfcid1[4];
	u8 bcc;
} __packed;

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struct digital_sensb_req {
	u8 cmd;
	u8 afi;
	u8 param;
} __packed;

struct digital_sensb_res {
	u8 cmd;
	u8 nfcid0[4];
	u8 app_data[4];
	u8 proto_info[3];
} __packed;

struct digital_attrib_req {
	u8 cmd;
	u8 nfcid0[4];
	u8 param1;
	u8 param2;
	u8 param3;
	u8 param4;
} __packed;

struct digital_attrib_res {
	u8 mbli_did;
} __packed;

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struct digital_sensf_req {
	u8 cmd;
	u8 sc1;
	u8 sc2;
	u8 rc;
	u8 tsn;
} __packed;

struct digital_sensf_res {
	u8 cmd;
	u8 nfcid2[8];
	u8 pad0[2];
	u8 pad1[3];
	u8 mrti_check;
	u8 mrti_update;
	u8 pad2;
	u8 rd[2];
} __packed;

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struct digital_iso15693_inv_req {
	u8 flags;
	u8 cmd;
	u8 mask_len;
	u64 mask;
} __packed;

struct digital_iso15693_inv_res {
	u8 flags;
	u8 dsfid;
	u64 uid;
} __packed;

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static int digital_in_send_sdd_req(struct nfc_digital_dev *ddev,
				   struct nfc_target *target);

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int digital_in_iso_dep_pull_sod(struct nfc_digital_dev *ddev,
				struct sk_buff *skb)
{
	u8 pcb;
	u8 block_type;

	if (skb->len < 1)
		return -EIO;

	pcb = *skb->data;
	block_type = DIGITAL_ISO_DEP_PCB_TYPE(pcb);

	/* No support fo R-block nor S-block */
	if (block_type != DIGITAL_ISO_DEP_I_BLOCK) {
		pr_err("ISO_DEP R-block and S-block not supported\n");
		return -EIO;
	}

	if (DIGITAL_ISO_DEP_BLOCK_HAS_DID(pcb)) {
		pr_err("DID field in ISO_DEP PCB not supported\n");
		return -EIO;
	}

	skb_pull(skb, 1);

	return 0;
}

int digital_in_iso_dep_push_sod(struct nfc_digital_dev *ddev,
				struct sk_buff *skb)
{
	/*
	 * Chaining not supported so skb->len + 1 PCB byte + 2 CRC bytes must
	 * not be greater than remote FSC
	 */
	if (skb->len + 3 > ddev->target_fsc)
		return -EIO;

	skb_push(skb, 1);

	*skb->data = DIGITAL_ISO_DEP_I_PCB | ddev->curr_nfc_dep_pni;

	ddev->curr_nfc_dep_pni =
		DIGITAL_ISO_DEP_PNI(ddev->curr_nfc_dep_pni + 1);

	return 0;
}

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static void digital_in_recv_ats(struct nfc_digital_dev *ddev, void *arg,
				struct sk_buff *resp)
{
	struct nfc_target *target = arg;
	u8 fsdi;
	int rc;

	if (IS_ERR(resp)) {
		rc = PTR_ERR(resp);
		resp = NULL;
		goto exit;
	}

	if (resp->len < 2) {
		rc = -EIO;
		goto exit;
	}

	fsdi = DIGITAL_ATS_FSCI(resp->data[1]);
	if (fsdi >= 8)
		ddev->target_fsc = DIGITAL_ATS_MAX_FSC;
	else
		ddev->target_fsc = digital_ats_fsc[fsdi];

	ddev->curr_nfc_dep_pni = 0;

	rc = digital_target_found(ddev, target, NFC_PROTO_ISO14443);

exit:
	dev_kfree_skb(resp);
	kfree(target);

	if (rc)
		digital_poll_next_tech(ddev);
}

static int digital_in_send_rats(struct nfc_digital_dev *ddev,
				struct nfc_target *target)
{
	int rc;
	struct sk_buff *skb;

	skb = digital_skb_alloc(ddev, 2);
	if (!skb)
		return -ENOMEM;

	*skb_put(skb, 1) = DIGITAL_RATS_BYTE1;
	*skb_put(skb, 1) = DIGITAL_RATS_PARAM;

	rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_ats,
				 target);
	if (rc)
		kfree_skb(skb);

	return rc;
}

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static void digital_in_recv_sel_res(struct nfc_digital_dev *ddev, void *arg,
				    struct sk_buff *resp)
{
	struct nfc_target *target = arg;
	int rc;
	u8 sel_res;
	u8 nfc_proto;

	if (IS_ERR(resp)) {
		rc = PTR_ERR(resp);
		resp = NULL;
		goto exit;
	}

	if (!DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
		rc = digital_skb_check_crc_a(resp);
		if (rc) {
			PROTOCOL_ERR("4.4.1.3");
			goto exit;
		}
	}

	if (!resp->len) {
		rc = -EIO;
		goto exit;
	}

	sel_res = resp->data[0];

	if (!DIGITAL_SEL_RES_NFCID1_COMPLETE(sel_res)) {
		rc = digital_in_send_sdd_req(ddev, target);
		if (rc)
			goto exit;

		goto exit_free_skb;
	}

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	target->sel_res = sel_res;

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	if (DIGITAL_SEL_RES_IS_T2T(sel_res)) {
		nfc_proto = NFC_PROTO_MIFARE;
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	} else if (DIGITAL_SEL_RES_IS_NFC_DEP(sel_res)) {
		nfc_proto = NFC_PROTO_NFC_DEP;
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	} else if (DIGITAL_SEL_RES_IS_T4T(sel_res)) {
		rc = digital_in_send_rats(ddev, target);
		if (rc)
			goto exit;
		/*
		 * Skip target_found and don't free it for now. This will be
		 * done when receiving the ATS
		 */
		goto exit_free_skb;
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	} else {
		rc = -EOPNOTSUPP;
		goto exit;
	}

	rc = digital_target_found(ddev, target, nfc_proto);

exit:
	kfree(target);

exit_free_skb:
	dev_kfree_skb(resp);

	if (rc)
		digital_poll_next_tech(ddev);
}

static int digital_in_send_sel_req(struct nfc_digital_dev *ddev,
				   struct nfc_target *target,
				   struct digital_sdd_res *sdd_res)
{
	struct sk_buff *skb;
	struct digital_sel_req *sel_req;
	u8 sel_cmd;
	int rc;

	skb = digital_skb_alloc(ddev, sizeof(struct digital_sel_req));
	if (!skb)
		return -ENOMEM;

	skb_put(skb, sizeof(struct digital_sel_req));
	sel_req = (struct digital_sel_req *)skb->data;

	if (target->nfcid1_len <= 4)
		sel_cmd = DIGITAL_CMD_SEL_REQ_CL1;
	else if (target->nfcid1_len < 10)
		sel_cmd = DIGITAL_CMD_SEL_REQ_CL2;
	else
		sel_cmd = DIGITAL_CMD_SEL_REQ_CL3;

	sel_req->sel_cmd = sel_cmd;
	sel_req->b2 = 0x70;
	memcpy(sel_req->nfcid1, sdd_res->nfcid1, 4);
	sel_req->bcc = sdd_res->bcc;

	if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
		rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
				NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A);
		if (rc)
			goto exit;
	} else {
		digital_skb_add_crc_a(skb);
	}

	rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sel_res,
				 target);
exit:
	if (rc)
		kfree_skb(skb);

	return rc;
}

static void digital_in_recv_sdd_res(struct nfc_digital_dev *ddev, void *arg,
				    struct sk_buff *resp)
{
	struct nfc_target *target = arg;
	struct digital_sdd_res *sdd_res;
	int rc;
	u8 offset, size;
	u8 i, bcc;

	if (IS_ERR(resp)) {
		rc = PTR_ERR(resp);
		resp = NULL;
		goto exit;
	}

	if (resp->len < DIGITAL_SDD_RES_LEN) {
		PROTOCOL_ERR("4.7.2.8");
		rc = -EINVAL;
		goto exit;
	}

	sdd_res = (struct digital_sdd_res *)resp->data;

	for (i = 0, bcc = 0; i < 4; i++)
		bcc ^= sdd_res->nfcid1[i];

	if (bcc != sdd_res->bcc) {
		PROTOCOL_ERR("4.7.2.6");
		rc = -EINVAL;
		goto exit;
	}

	if (sdd_res->nfcid1[0] == DIGITAL_SDD_RES_CT) {
		offset = 1;
		size = 3;
	} else {
		offset = 0;
		size = 4;
	}

	memcpy(target->nfcid1 + target->nfcid1_len, sdd_res->nfcid1 + offset,
	       size);
	target->nfcid1_len += size;

	rc = digital_in_send_sel_req(ddev, target, sdd_res);

exit:
	dev_kfree_skb(resp);

	if (rc) {
		kfree(target);
		digital_poll_next_tech(ddev);
	}
}

static int digital_in_send_sdd_req(struct nfc_digital_dev *ddev,
				   struct nfc_target *target)
{
	int rc;
	struct sk_buff *skb;
	u8 sel_cmd;

	rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
				     NFC_DIGITAL_FRAMING_NFCA_STANDARD);
	if (rc)
		return rc;

	skb = digital_skb_alloc(ddev, 2);
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	if (!skb)
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		return -ENOMEM;

	if (target->nfcid1_len == 0)
		sel_cmd = DIGITAL_CMD_SEL_REQ_CL1;
	else if (target->nfcid1_len == 3)
		sel_cmd = DIGITAL_CMD_SEL_REQ_CL2;
	else
		sel_cmd = DIGITAL_CMD_SEL_REQ_CL3;

	*skb_put(skb, sizeof(u8)) = sel_cmd;
	*skb_put(skb, sizeof(u8)) = DIGITAL_SDD_REQ_SEL_PAR;

	return digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sdd_res,
				   target);
}

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static void digital_in_recv_sens_res(struct nfc_digital_dev *ddev, void *arg,
				     struct sk_buff *resp)
{
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	struct nfc_target *target = NULL;
	int rc;

	if (IS_ERR(resp)) {
		rc = PTR_ERR(resp);
		resp = NULL;
		goto exit;
	}

	if (resp->len < sizeof(u16)) {
		rc = -EIO;
		goto exit;
	}

	target = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
	if (!target) {
		rc = -ENOMEM;
		goto exit;
	}

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	target->sens_res = __le16_to_cpu(*(__le16 *)resp->data);
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	if (!DIGITAL_SENS_RES_IS_VALID(target->sens_res)) {
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		PROTOCOL_ERR("4.6.3.3");
		rc = -EINVAL;
		goto exit;
	}

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	if (DIGITAL_SENS_RES_IS_T1T(target->sens_res))
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		rc = digital_target_found(ddev, target, NFC_PROTO_JEWEL);
	else
		rc = digital_in_send_sdd_req(ddev, target);

exit:
	dev_kfree_skb(resp);

	if (rc) {
		kfree(target);
		digital_poll_next_tech(ddev);
	}
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}

int digital_in_send_sens_req(struct nfc_digital_dev *ddev, u8 rf_tech)
{
	struct sk_buff *skb;
	int rc;

	rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
				     NFC_DIGITAL_RF_TECH_106A);
	if (rc)
		return rc;

	rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
				     NFC_DIGITAL_FRAMING_NFCA_SHORT);
	if (rc)
		return rc;

	skb = digital_skb_alloc(ddev, 1);
	if (!skb)
		return -ENOMEM;

	*skb_put(skb, sizeof(u8)) = DIGITAL_CMD_SENS_REQ;

	rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sens_res, NULL);
	if (rc)
		kfree_skb(skb);

	return rc;
}
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int digital_in_recv_mifare_res(struct sk_buff *resp)
{
	/* Successful READ command response is 16 data bytes + 2 CRC bytes long.
	 * Since the driver can't differentiate a ACK/NACK response from a valid
	 * READ response, the CRC calculation must be handled at digital level
	 * even if the driver supports it for this technology.
	 */
	if (resp->len == DIGITAL_MIFARE_READ_RES_LEN + DIGITAL_CRC_LEN) {
		if (digital_skb_check_crc_a(resp)) {
			PROTOCOL_ERR("9.4.1.2");
			return -EIO;
		}

		return 0;
	}

	/* ACK response (i.e. successful WRITE). */
	if (resp->len == 1 && resp->data[0] == DIGITAL_MIFARE_ACK_RES) {
		resp->data[0] = 0;
		return 0;
	}

	/* NACK and any other responses are treated as error. */
	return -EIO;
}
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static void digital_in_recv_attrib_res(struct nfc_digital_dev *ddev, void *arg,
				       struct sk_buff *resp)
{
	struct nfc_target *target = arg;
	struct digital_attrib_res *attrib_res;
	int rc;

	if (IS_ERR(resp)) {
		rc = PTR_ERR(resp);
		resp = NULL;
		goto exit;
	}

	if (resp->len < sizeof(*attrib_res)) {
		PROTOCOL_ERR("12.6.2");
		rc = -EIO;
		goto exit;
	}

	attrib_res = (struct digital_attrib_res *)resp->data;

	if (attrib_res->mbli_did & 0x0f) {
		PROTOCOL_ERR("12.6.2.1");
		rc = -EIO;
		goto exit;
	}

	rc = digital_target_found(ddev, target, NFC_PROTO_ISO14443_B);

exit:
	dev_kfree_skb(resp);
	kfree(target);

	if (rc)
		digital_poll_next_tech(ddev);
}

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static int digital_in_send_attrib_req(struct nfc_digital_dev *ddev,
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			       struct nfc_target *target,
			       struct digital_sensb_res *sensb_res)
{
	struct digital_attrib_req *attrib_req;
	struct sk_buff *skb;
	int rc;

	skb = digital_skb_alloc(ddev, sizeof(*attrib_req));
	if (!skb)
		return -ENOMEM;

	attrib_req = (struct digital_attrib_req *)skb_put(skb,
							  sizeof(*attrib_req));

	attrib_req->cmd = DIGITAL_CMD_ATTRIB_REQ;
	memcpy(attrib_req->nfcid0, sensb_res->nfcid0,
	       sizeof(attrib_req->nfcid0));
	attrib_req->param1 = DIGITAL_ATTRIB_P1_TR0_DEFAULT |
			     DIGITAL_ATTRIB_P1_TR1_DEFAULT;
	attrib_req->param2 = DIGITAL_ATTRIB_P2_LISTEN_POLL_1 |
			     DIGITAL_ATTRIB_P2_POLL_LISTEN_1 |
			     DIGITAL_ATTRIB_P2_MAX_FRAME_256;
	attrib_req->param3 = sensb_res->proto_info[1] & 0x07;
	attrib_req->param4 = DIGITAL_ATTRIB_P4_DID(0);

	rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_attrib_res,
				 target);
	if (rc)
		kfree_skb(skb);

	return rc;
}

static void digital_in_recv_sensb_res(struct nfc_digital_dev *ddev, void *arg,
				      struct sk_buff *resp)
{
	struct nfc_target *target = NULL;
	struct digital_sensb_res *sensb_res;
	u8 fsci;
	int rc;

	if (IS_ERR(resp)) {
		rc = PTR_ERR(resp);
		resp = NULL;
		goto exit;
	}

	if (resp->len != sizeof(*sensb_res)) {
		PROTOCOL_ERR("5.6.2.1");
		rc = -EIO;
		goto exit;
	}

	sensb_res = (struct digital_sensb_res *)resp->data;

	if (sensb_res->cmd != DIGITAL_CMD_SENSB_RES) {
		PROTOCOL_ERR("5.6.2");
		rc = -EIO;
		goto exit;
	}

	if (!(sensb_res->proto_info[1] & BIT(0))) {
		PROTOCOL_ERR("5.6.2.12");
		rc = -EIO;
		goto exit;
	}

	if (sensb_res->proto_info[1] & BIT(3)) {
		PROTOCOL_ERR("5.6.2.16");
		rc = -EIO;
		goto exit;
	}

	fsci = DIGITAL_SENSB_FSCI(sensb_res->proto_info[1]);
	if (fsci >= 8)
		ddev->target_fsc = DIGITAL_ATS_MAX_FSC;
	else
		ddev->target_fsc = digital_ats_fsc[fsci];

	target = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
	if (!target) {
		rc = -ENOMEM;
		goto exit;
	}

	rc = digital_in_send_attrib_req(ddev, target, sensb_res);

exit:
	dev_kfree_skb(resp);

	if (rc) {
		kfree(target);
		digital_poll_next_tech(ddev);
	}
}

int digital_in_send_sensb_req(struct nfc_digital_dev *ddev, u8 rf_tech)
{
	struct digital_sensb_req *sensb_req;
	struct sk_buff *skb;
	int rc;

	rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
				     NFC_DIGITAL_RF_TECH_106B);
	if (rc)
		return rc;

	rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
				     NFC_DIGITAL_FRAMING_NFCB);
	if (rc)
		return rc;

	skb = digital_skb_alloc(ddev, sizeof(*sensb_req));
	if (!skb)
		return -ENOMEM;

	sensb_req = (struct digital_sensb_req *)skb_put(skb,
							sizeof(*sensb_req));

	sensb_req->cmd = DIGITAL_CMD_SENSB_REQ;
	sensb_req->afi = 0x00; /* All families and sub-families */
	sensb_req->param = DIGITAL_SENSB_N(0);

	rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sensb_res,
				 NULL);
	if (rc)
		kfree_skb(skb);

	return rc;
}

748 749 750 751
static void digital_in_recv_sensf_res(struct nfc_digital_dev *ddev, void *arg,
				   struct sk_buff *resp)
{
	int rc;
752
	u8 proto;
753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786
	struct nfc_target target;
	struct digital_sensf_res *sensf_res;

	if (IS_ERR(resp)) {
		rc = PTR_ERR(resp);
		resp = NULL;
		goto exit;
	}

	if (resp->len < DIGITAL_SENSF_RES_MIN_LENGTH) {
		rc = -EIO;
		goto exit;
	}

	if (!DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
		rc = digital_skb_check_crc_f(resp);
		if (rc) {
			PROTOCOL_ERR("6.4.1.8");
			goto exit;
		}
	}

	skb_pull(resp, 1);

	memset(&target, 0, sizeof(struct nfc_target));

	sensf_res = (struct digital_sensf_res *)resp->data;

	memcpy(target.sensf_res, sensf_res, resp->len);
	target.sensf_res_len = resp->len;

	memcpy(target.nfcid2, sensf_res->nfcid2, NFC_NFCID2_MAXSIZE);
	target.nfcid2_len = NFC_NFCID2_MAXSIZE;

787 788 789 790 791 792 793
	if (target.nfcid2[0] == DIGITAL_SENSF_NFCID2_NFC_DEP_B1 &&
	    target.nfcid2[1] == DIGITAL_SENSF_NFCID2_NFC_DEP_B2)
		proto = NFC_PROTO_NFC_DEP;
	else
		proto = NFC_PROTO_FELICA;

	rc = digital_target_found(ddev, &target, proto);
794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844

exit:
	dev_kfree_skb(resp);

	if (rc)
		digital_poll_next_tech(ddev);
}

int digital_in_send_sensf_req(struct nfc_digital_dev *ddev, u8 rf_tech)
{
	struct digital_sensf_req *sensf_req;
	struct sk_buff *skb;
	int rc;
	u8 size;

	rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech);
	if (rc)
		return rc;

	rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
				     NFC_DIGITAL_FRAMING_NFCF);
	if (rc)
		return rc;

	size = sizeof(struct digital_sensf_req);

	skb = digital_skb_alloc(ddev, size);
	if (!skb)
		return -ENOMEM;

	skb_put(skb, size);

	sensf_req = (struct digital_sensf_req *)skb->data;
	sensf_req->cmd = DIGITAL_CMD_SENSF_REQ;
	sensf_req->sc1 = 0xFF;
	sensf_req->sc2 = 0xFF;
	sensf_req->rc = 0;
	sensf_req->tsn = 0;

	*skb_push(skb, 1) = size + 1;

	if (!DIGITAL_DRV_CAPS_IN_CRC(ddev))
		digital_skb_add_crc_f(skb);

	rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sensf_res,
				 NULL);
	if (rc)
		kfree_skb(skb);

	return rc;
}
845

846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932
static void digital_in_recv_iso15693_inv_res(struct nfc_digital_dev *ddev,
		void *arg, struct sk_buff *resp)
{
	struct digital_iso15693_inv_res *res;
	struct nfc_target *target = NULL;
	int rc;

	if (IS_ERR(resp)) {
		rc = PTR_ERR(resp);
		resp = NULL;
		goto out_free_skb;
	}

	if (resp->len != sizeof(*res)) {
		rc = -EIO;
		goto out_free_skb;
	}

	res = (struct digital_iso15693_inv_res *)resp->data;

	if (!DIGITAL_ISO15693_RES_IS_VALID(res->flags)) {
		PROTOCOL_ERR("ISO15693 - 10.3.1");
		rc = -EINVAL;
		goto out_free_skb;
	}

	target = kzalloc(sizeof(*target), GFP_KERNEL);
	if (!target) {
		rc = -ENOMEM;
		goto out_free_skb;
	}

	target->is_iso15693 = 1;
	target->iso15693_dsfid = res->dsfid;
	memcpy(target->iso15693_uid, &res->uid, sizeof(target->iso15693_uid));

	rc = digital_target_found(ddev, target, NFC_PROTO_ISO15693);

	kfree(target);

out_free_skb:
	dev_kfree_skb(resp);

	if (rc)
		digital_poll_next_tech(ddev);
}

int digital_in_send_iso15693_inv_req(struct nfc_digital_dev *ddev, u8 rf_tech)
{
	struct digital_iso15693_inv_req *req;
	struct sk_buff *skb;
	int rc;

	rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
				     NFC_DIGITAL_RF_TECH_ISO15693);
	if (rc)
		return rc;

	rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
				     NFC_DIGITAL_FRAMING_ISO15693_INVENTORY);
	if (rc)
		return rc;

	skb = digital_skb_alloc(ddev, sizeof(*req));
	if (!skb)
		return -ENOMEM;

	skb_put(skb, sizeof(*req) - sizeof(req->mask)); /* No mask */
	req = (struct digital_iso15693_inv_req *)skb->data;

	/* Single sub-carrier, high data rate, no AFI, single slot
	 * Inventory command
	 */
	req->flags = DIGITAL_ISO15693_REQ_FLAG_DATA_RATE |
		     DIGITAL_ISO15693_REQ_FLAG_INVENTORY |
		     DIGITAL_ISO15693_REQ_FLAG_NB_SLOTS;
	req->cmd = DIGITAL_CMD_ISO15693_INVENTORY_REQ;
	req->mask_len = 0;

	rc = digital_in_send_cmd(ddev, skb, 30,
				 digital_in_recv_iso15693_inv_res, NULL);
	if (rc)
		kfree_skb(skb);

	return rc;
}

933 934 935 936 937 938 939 940 941 942 943 944 945 946
static int digital_tg_send_sel_res(struct nfc_digital_dev *ddev)
{
	struct sk_buff *skb;
	int rc;

	skb = digital_skb_alloc(ddev, 1);
	if (!skb)
		return -ENOMEM;

	*skb_put(skb, 1) = DIGITAL_SEL_RES_NFC_DEP;

	if (!DIGITAL_DRV_CAPS_TG_CRC(ddev))
		digital_skb_add_crc_a(skb);

947 948 949 950 951 952 953
	rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
				     NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE);
	if (rc) {
		kfree_skb(skb);
		return rc;
	}

954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011
	rc = digital_tg_send_cmd(ddev, skb, 300, digital_tg_recv_atr_req,
				 NULL);
	if (rc)
		kfree_skb(skb);

	return rc;
}

static void digital_tg_recv_sel_req(struct nfc_digital_dev *ddev, void *arg,
				    struct sk_buff *resp)
{
	int rc;

	if (IS_ERR(resp)) {
		rc = PTR_ERR(resp);
		resp = NULL;
		goto exit;
	}

	if (!DIGITAL_DRV_CAPS_TG_CRC(ddev)) {
		rc = digital_skb_check_crc_a(resp);
		if (rc) {
			PROTOCOL_ERR("4.4.1.3");
			goto exit;
		}
	}

	/* Silently ignore SEL_REQ content and send a SEL_RES for NFC-DEP */

	rc = digital_tg_send_sel_res(ddev);

exit:
	if (rc)
		digital_poll_next_tech(ddev);

	dev_kfree_skb(resp);
}

static int digital_tg_send_sdd_res(struct nfc_digital_dev *ddev)
{
	struct sk_buff *skb;
	struct digital_sdd_res *sdd_res;
	int rc, i;

	skb = digital_skb_alloc(ddev, sizeof(struct digital_sdd_res));
	if (!skb)
		return -ENOMEM;

	skb_put(skb, sizeof(struct digital_sdd_res));
	sdd_res = (struct digital_sdd_res *)skb->data;

	sdd_res->nfcid1[0] = 0x08;
	get_random_bytes(sdd_res->nfcid1 + 1, 3);

	sdd_res->bcc = 0;
	for (i = 0; i < 4; i++)
		sdd_res->bcc ^= sdd_res->nfcid1[i];

1012 1013 1014 1015 1016 1017 1018
	rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
				NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A);
	if (rc) {
		kfree_skb(skb);
		return rc;
	}

1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070
	rc = digital_tg_send_cmd(ddev, skb, 300, digital_tg_recv_sel_req,
				 NULL);
	if (rc)
		kfree_skb(skb);

	return rc;
}

static void digital_tg_recv_sdd_req(struct nfc_digital_dev *ddev, void *arg,
				    struct sk_buff *resp)
{
	u8 *sdd_req;
	int rc;

	if (IS_ERR(resp)) {
		rc = PTR_ERR(resp);
		resp = NULL;
		goto exit;
	}

	sdd_req = resp->data;

	if (resp->len < 2 || sdd_req[0] != DIGITAL_CMD_SEL_REQ_CL1 ||
	    sdd_req[1] != DIGITAL_SDD_REQ_SEL_PAR) {
		rc = -EINVAL;
		goto exit;
	}

	rc = digital_tg_send_sdd_res(ddev);

exit:
	if (rc)
		digital_poll_next_tech(ddev);

	dev_kfree_skb(resp);
}

static int digital_tg_send_sens_res(struct nfc_digital_dev *ddev)
{
	struct sk_buff *skb;
	u8 *sens_res;
	int rc;

	skb = digital_skb_alloc(ddev, 2);
	if (!skb)
		return -ENOMEM;

	sens_res = skb_put(skb, 2);

	sens_res[0] = (DIGITAL_SENS_RES_NFC_DEP >> 8) & 0xFF;
	sens_res[1] = DIGITAL_SENS_RES_NFC_DEP & 0xFF;

1071 1072 1073 1074 1075 1076 1077
	rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
				     NFC_DIGITAL_FRAMING_NFCA_STANDARD);
	if (rc) {
		kfree_skb(skb);
		return rc;
	}

1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114
	rc = digital_tg_send_cmd(ddev, skb, 300, digital_tg_recv_sdd_req,
				 NULL);
	if (rc)
		kfree_skb(skb);

	return rc;
}

void digital_tg_recv_sens_req(struct nfc_digital_dev *ddev, void *arg,
			      struct sk_buff *resp)
{
	u8 sens_req;
	int rc;

	if (IS_ERR(resp)) {
		rc = PTR_ERR(resp);
		resp = NULL;
		goto exit;
	}

	sens_req = resp->data[0];

	if (!resp->len || (sens_req != DIGITAL_CMD_SENS_REQ &&
	    sens_req != DIGITAL_CMD_ALL_REQ)) {
		rc = -EINVAL;
		goto exit;
	}

	rc = digital_tg_send_sens_res(ddev);

exit:
	if (rc)
		digital_poll_next_tech(ddev);

	dev_kfree_skb(resp);
}

1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126
static void digital_tg_recv_atr_or_sensf_req(struct nfc_digital_dev *ddev,
		void *arg, struct sk_buff *resp)
{
	if (!IS_ERR(resp) && (resp->len >= 2) &&
			(resp->data[1] == DIGITAL_CMD_SENSF_REQ))
		digital_tg_recv_sensf_req(ddev, arg, resp);
	else
		digital_tg_recv_atr_req(ddev, arg, resp);

	return;
}

1127
static int digital_tg_send_sensf_res(struct nfc_digital_dev *ddev,
1128 1129 1130 1131 1132 1133 1134 1135 1136
			      struct digital_sensf_req *sensf_req)
{
	struct sk_buff *skb;
	u8 size;
	int rc;
	struct digital_sensf_res *sensf_res;

	size = sizeof(struct digital_sensf_res);

1137
	if (sensf_req->rc == DIGITAL_SENSF_REQ_RC_NONE)
1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171
		size -= sizeof(sensf_res->rd);

	skb = digital_skb_alloc(ddev, size);
	if (!skb)
		return -ENOMEM;

	skb_put(skb, size);

	sensf_res = (struct digital_sensf_res *)skb->data;

	memset(sensf_res, 0, size);

	sensf_res->cmd = DIGITAL_CMD_SENSF_RES;
	sensf_res->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1;
	sensf_res->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2;
	get_random_bytes(&sensf_res->nfcid2[2], 6);

	switch (sensf_req->rc) {
	case DIGITAL_SENSF_REQ_RC_SC:
		sensf_res->rd[0] = sensf_req->sc1;
		sensf_res->rd[1] = sensf_req->sc2;
		break;
	case DIGITAL_SENSF_REQ_RC_AP:
		sensf_res->rd[0] = DIGITAL_SENSF_RES_RD_AP_B1;
		sensf_res->rd[1] = DIGITAL_SENSF_RES_RD_AP_B2;
		break;
	}

	*skb_push(skb, sizeof(u8)) = size + 1;

	if (!DIGITAL_DRV_CAPS_TG_CRC(ddev))
		digital_skb_add_crc_f(skb);

	rc = digital_tg_send_cmd(ddev, skb, 300,
1172
				 digital_tg_recv_atr_or_sensf_req, NULL);
1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220
	if (rc)
		kfree_skb(skb);

	return rc;
}

void digital_tg_recv_sensf_req(struct nfc_digital_dev *ddev, void *arg,
			       struct sk_buff *resp)
{
	struct digital_sensf_req *sensf_req;
	int rc;

	if (IS_ERR(resp)) {
		rc = PTR_ERR(resp);
		resp = NULL;
		goto exit;
	}

	if (!DIGITAL_DRV_CAPS_TG_CRC(ddev)) {
		rc = digital_skb_check_crc_f(resp);
		if (rc) {
			PROTOCOL_ERR("6.4.1.8");
			goto exit;
		}
	}

	if (resp->len != sizeof(struct digital_sensf_req) + 1) {
		rc = -EINVAL;
		goto exit;
	}

	skb_pull(resp, 1);
	sensf_req = (struct digital_sensf_req *)resp->data;

	if (sensf_req->cmd != DIGITAL_CMD_SENSF_REQ) {
		rc = -EINVAL;
		goto exit;
	}

	rc = digital_tg_send_sensf_res(ddev, sensf_req);

exit:
	if (rc)
		digital_poll_next_tech(ddev);

	dev_kfree_skb(resp);
}

1221
static int digital_tg_config_nfca(struct nfc_digital_dev *ddev)
1222 1223 1224
{
	int rc;

1225 1226
	rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
				     NFC_DIGITAL_RF_TECH_106A);
1227 1228 1229
	if (rc)
		return rc;

1230 1231 1232 1233 1234 1235 1236 1237 1238
	return digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
				       NFC_DIGITAL_FRAMING_NFCA_NFC_DEP);
}

int digital_tg_listen_nfca(struct nfc_digital_dev *ddev, u8 rf_tech)
{
	int rc;

	rc = digital_tg_config_nfca(ddev);
1239 1240 1241 1242 1243 1244
	if (rc)
		return rc;

	return digital_tg_listen(ddev, 300, digital_tg_recv_sens_req, NULL);
}

1245
static int digital_tg_config_nfcf(struct nfc_digital_dev *ddev, u8 rf_tech)
1246 1247 1248 1249 1250 1251 1252
{
	int rc;

	rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech);
	if (rc)
		return rc;

1253 1254 1255 1256 1257 1258 1259 1260 1261
	return digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
				       NFC_DIGITAL_FRAMING_NFCF_NFC_DEP);
}

int digital_tg_listen_nfcf(struct nfc_digital_dev *ddev, u8 rf_tech)
{
	int rc;

	rc = digital_tg_config_nfcf(ddev, rf_tech);
1262 1263 1264
	if (rc)
		return rc;

1265
	return digital_tg_listen(ddev, 300, digital_tg_recv_sensf_req, NULL);
1266
}
1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306

void digital_tg_recv_md_req(struct nfc_digital_dev *ddev, void *arg,
			    struct sk_buff *resp)
{
	u8 rf_tech;
	int rc;

	if (IS_ERR(resp)) {
		resp = NULL;
		goto exit_free_skb;
	}

	rc = ddev->ops->tg_get_rf_tech(ddev, &rf_tech);
	if (rc)
		goto exit_free_skb;

	switch (rf_tech) {
	case NFC_DIGITAL_RF_TECH_106A:
		rc = digital_tg_config_nfca(ddev);
		if (rc)
			goto exit_free_skb;
		digital_tg_recv_sens_req(ddev, arg, resp);
		break;
	case NFC_DIGITAL_RF_TECH_212F:
	case NFC_DIGITAL_RF_TECH_424F:
		rc = digital_tg_config_nfcf(ddev, rf_tech);
		if (rc)
			goto exit_free_skb;
		digital_tg_recv_sensf_req(ddev, arg, resp);
		break;
	default:
		goto exit_free_skb;
	}

	return;

exit_free_skb:
	digital_poll_next_tech(ddev);
	dev_kfree_skb(resp);
}