8c0695e499
This adds polling support for NFC-F technology at 212 kbits/s and 424
kbits/s. A user space application like neard can send type 3 tag
commands through the NFC core.
Process flow for NFC-F detection is as follow:
1 - The digital stack sends the SENSF_REQ command to the NFC device.
2 - A peer device replies with a SENSF_RES response.
3 - The digital stack notifies the NFC core of the presence of a
target in the operation field and passes the target NFCID2.
This also adds support for CRC calculation of type CRC-F. The CRC
calculation is handled by the digital stack if the NFC device doesn't
support it.
Signed-off-by: Thierry Escande <thierry.escande@linux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
468 lines
9.6 KiB
C
468 lines
9.6 KiB
C
/*
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* NFC Digital Protocol stack
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* Copyright (c) 2013, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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*/
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#include "digital.h"
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#define DIGITAL_CMD_SENS_REQ 0x26
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#define DIGITAL_CMD_ALL_REQ 0x52
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#define DIGITAL_CMD_SEL_REQ_CL1 0x93
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#define DIGITAL_CMD_SEL_REQ_CL2 0x95
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#define DIGITAL_CMD_SEL_REQ_CL3 0x97
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#define DIGITAL_SDD_REQ_SEL_PAR 0x20
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#define DIGITAL_SDD_RES_CT 0x88
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#define DIGITAL_SDD_RES_LEN 5
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#define DIGITAL_SEL_RES_NFCID1_COMPLETE(sel_res) (!((sel_res) & 0x04))
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#define DIGITAL_SEL_RES_IS_T2T(sel_res) (!((sel_res) & 0x60))
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#define DIGITAL_SENS_RES_IS_T1T(sens_res) (((sens_res) & 0x000C) == 0x000C)
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#define DIGITAL_SENS_RES_IS_VALID(sens_res) \
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((!((sens_res) & 0x1F00) && (((sens_res) & 0x000C) == 0x000C)) || \
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(((sens_res) & 0x1F00) && ((sens_res) & 0x000C) != 0x000C))
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#define DIGITAL_MIFARE_READ_RES_LEN 16
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#define DIGITAL_MIFARE_ACK_RES 0x0A
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#define DIGITAL_CMD_SENSF_REQ 0x00
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#define DIGITAL_CMD_SENSF_RES 0x01
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#define DIGITAL_SENSF_RES_MIN_LENGTH 17
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#define DIGITAL_SENSF_RES_RD_AP_B1 0x00
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#define DIGITAL_SENSF_RES_RD_AP_B2 0x8F
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#define DIGITAL_SENSF_REQ_RC_NONE 0
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#define DIGITAL_SENSF_REQ_RC_SC 1
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#define DIGITAL_SENSF_REQ_RC_AP 2
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struct digital_sdd_res {
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u8 nfcid1[4];
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u8 bcc;
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} __packed;
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struct digital_sel_req {
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u8 sel_cmd;
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u8 b2;
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u8 nfcid1[4];
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u8 bcc;
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} __packed;
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struct digital_sensf_req {
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u8 cmd;
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u8 sc1;
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u8 sc2;
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u8 rc;
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u8 tsn;
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} __packed;
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struct digital_sensf_res {
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u8 cmd;
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u8 nfcid2[8];
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u8 pad0[2];
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u8 pad1[3];
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u8 mrti_check;
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u8 mrti_update;
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u8 pad2;
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u8 rd[2];
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} __packed;
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static int digital_in_send_sdd_req(struct nfc_digital_dev *ddev,
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struct nfc_target *target);
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static void digital_in_recv_sel_res(struct nfc_digital_dev *ddev, void *arg,
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struct sk_buff *resp)
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{
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struct nfc_target *target = arg;
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int rc;
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u8 sel_res;
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u8 nfc_proto;
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if (IS_ERR(resp)) {
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rc = PTR_ERR(resp);
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resp = NULL;
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goto exit;
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}
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if (!DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
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rc = digital_skb_check_crc_a(resp);
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if (rc) {
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PROTOCOL_ERR("4.4.1.3");
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goto exit;
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}
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}
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if (!resp->len) {
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rc = -EIO;
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goto exit;
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}
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sel_res = resp->data[0];
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if (!DIGITAL_SEL_RES_NFCID1_COMPLETE(sel_res)) {
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rc = digital_in_send_sdd_req(ddev, target);
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if (rc)
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goto exit;
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goto exit_free_skb;
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}
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if (DIGITAL_SEL_RES_IS_T2T(sel_res)) {
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nfc_proto = NFC_PROTO_MIFARE;
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} else {
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rc = -EOPNOTSUPP;
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goto exit;
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}
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target->sel_res = sel_res;
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rc = digital_target_found(ddev, target, nfc_proto);
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exit:
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kfree(target);
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exit_free_skb:
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dev_kfree_skb(resp);
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if (rc)
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digital_poll_next_tech(ddev);
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}
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static int digital_in_send_sel_req(struct nfc_digital_dev *ddev,
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struct nfc_target *target,
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struct digital_sdd_res *sdd_res)
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{
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struct sk_buff *skb;
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struct digital_sel_req *sel_req;
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u8 sel_cmd;
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int rc;
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skb = digital_skb_alloc(ddev, sizeof(struct digital_sel_req));
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if (!skb)
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return -ENOMEM;
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skb_put(skb, sizeof(struct digital_sel_req));
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sel_req = (struct digital_sel_req *)skb->data;
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if (target->nfcid1_len <= 4)
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sel_cmd = DIGITAL_CMD_SEL_REQ_CL1;
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else if (target->nfcid1_len < 10)
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sel_cmd = DIGITAL_CMD_SEL_REQ_CL2;
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else
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sel_cmd = DIGITAL_CMD_SEL_REQ_CL3;
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sel_req->sel_cmd = sel_cmd;
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sel_req->b2 = 0x70;
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memcpy(sel_req->nfcid1, sdd_res->nfcid1, 4);
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sel_req->bcc = sdd_res->bcc;
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if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
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rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
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NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A);
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if (rc)
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goto exit;
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} else {
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digital_skb_add_crc_a(skb);
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}
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rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sel_res,
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target);
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exit:
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if (rc)
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kfree_skb(skb);
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return rc;
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}
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static void digital_in_recv_sdd_res(struct nfc_digital_dev *ddev, void *arg,
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struct sk_buff *resp)
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{
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struct nfc_target *target = arg;
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struct digital_sdd_res *sdd_res;
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int rc;
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u8 offset, size;
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u8 i, bcc;
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if (IS_ERR(resp)) {
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rc = PTR_ERR(resp);
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resp = NULL;
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goto exit;
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}
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if (resp->len < DIGITAL_SDD_RES_LEN) {
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PROTOCOL_ERR("4.7.2.8");
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rc = -EINVAL;
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goto exit;
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}
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sdd_res = (struct digital_sdd_res *)resp->data;
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for (i = 0, bcc = 0; i < 4; i++)
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bcc ^= sdd_res->nfcid1[i];
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if (bcc != sdd_res->bcc) {
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PROTOCOL_ERR("4.7.2.6");
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rc = -EINVAL;
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goto exit;
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}
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if (sdd_res->nfcid1[0] == DIGITAL_SDD_RES_CT) {
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offset = 1;
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size = 3;
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} else {
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offset = 0;
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size = 4;
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}
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memcpy(target->nfcid1 + target->nfcid1_len, sdd_res->nfcid1 + offset,
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size);
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target->nfcid1_len += size;
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rc = digital_in_send_sel_req(ddev, target, sdd_res);
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exit:
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dev_kfree_skb(resp);
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if (rc) {
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kfree(target);
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digital_poll_next_tech(ddev);
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}
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}
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static int digital_in_send_sdd_req(struct nfc_digital_dev *ddev,
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struct nfc_target *target)
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{
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int rc;
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struct sk_buff *skb;
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u8 sel_cmd;
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rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
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NFC_DIGITAL_FRAMING_NFCA_STANDARD);
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if (rc)
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return rc;
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skb = digital_skb_alloc(ddev, 2);
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if (!skb) {
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PR_ERR("alloc_skb failed");
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return -ENOMEM;
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}
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if (target->nfcid1_len == 0)
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sel_cmd = DIGITAL_CMD_SEL_REQ_CL1;
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else if (target->nfcid1_len == 3)
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sel_cmd = DIGITAL_CMD_SEL_REQ_CL2;
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else
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sel_cmd = DIGITAL_CMD_SEL_REQ_CL3;
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*skb_put(skb, sizeof(u8)) = sel_cmd;
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*skb_put(skb, sizeof(u8)) = DIGITAL_SDD_REQ_SEL_PAR;
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return digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sdd_res,
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target);
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}
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static void digital_in_recv_sens_res(struct nfc_digital_dev *ddev, void *arg,
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struct sk_buff *resp)
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{
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struct nfc_target *target = NULL;
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u16 sens_res;
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int rc;
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if (IS_ERR(resp)) {
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rc = PTR_ERR(resp);
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resp = NULL;
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goto exit;
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}
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if (resp->len < sizeof(u16)) {
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rc = -EIO;
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goto exit;
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}
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target = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
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if (!target) {
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rc = -ENOMEM;
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goto exit;
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}
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memcpy(&target->sens_res, resp->data, sizeof(u16));
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sens_res = be16_to_cpu(target->sens_res);
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if (!DIGITAL_SENS_RES_IS_VALID(sens_res)) {
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PROTOCOL_ERR("4.6.3.3");
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rc = -EINVAL;
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goto exit;
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}
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if (DIGITAL_SENS_RES_IS_T1T(sens_res))
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rc = digital_target_found(ddev, target, NFC_PROTO_JEWEL);
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else
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rc = digital_in_send_sdd_req(ddev, target);
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exit:
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dev_kfree_skb(resp);
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if (rc) {
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kfree(target);
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digital_poll_next_tech(ddev);
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}
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}
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int digital_in_send_sens_req(struct nfc_digital_dev *ddev, u8 rf_tech)
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{
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struct sk_buff *skb;
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int rc;
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rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
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NFC_DIGITAL_RF_TECH_106A);
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if (rc)
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return rc;
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rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
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NFC_DIGITAL_FRAMING_NFCA_SHORT);
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if (rc)
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return rc;
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skb = digital_skb_alloc(ddev, 1);
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if (!skb)
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return -ENOMEM;
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*skb_put(skb, sizeof(u8)) = DIGITAL_CMD_SENS_REQ;
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rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sens_res, NULL);
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if (rc)
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kfree_skb(skb);
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return rc;
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}
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int digital_in_recv_mifare_res(struct sk_buff *resp)
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{
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/* Successful READ command response is 16 data bytes + 2 CRC bytes long.
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* Since the driver can't differentiate a ACK/NACK response from a valid
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* READ response, the CRC calculation must be handled at digital level
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* even if the driver supports it for this technology.
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*/
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if (resp->len == DIGITAL_MIFARE_READ_RES_LEN + DIGITAL_CRC_LEN) {
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if (digital_skb_check_crc_a(resp)) {
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PROTOCOL_ERR("9.4.1.2");
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return -EIO;
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}
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return 0;
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}
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/* ACK response (i.e. successful WRITE). */
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if (resp->len == 1 && resp->data[0] == DIGITAL_MIFARE_ACK_RES) {
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resp->data[0] = 0;
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return 0;
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}
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/* NACK and any other responses are treated as error. */
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return -EIO;
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}
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static void digital_in_recv_sensf_res(struct nfc_digital_dev *ddev, void *arg,
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struct sk_buff *resp)
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{
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int rc;
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struct nfc_target target;
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struct digital_sensf_res *sensf_res;
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if (IS_ERR(resp)) {
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rc = PTR_ERR(resp);
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resp = NULL;
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goto exit;
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}
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if (resp->len < DIGITAL_SENSF_RES_MIN_LENGTH) {
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rc = -EIO;
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goto exit;
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}
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if (!DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
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rc = digital_skb_check_crc_f(resp);
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if (rc) {
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PROTOCOL_ERR("6.4.1.8");
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goto exit;
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}
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}
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skb_pull(resp, 1);
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memset(&target, 0, sizeof(struct nfc_target));
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sensf_res = (struct digital_sensf_res *)resp->data;
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memcpy(target.sensf_res, sensf_res, resp->len);
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target.sensf_res_len = resp->len;
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memcpy(target.nfcid2, sensf_res->nfcid2, NFC_NFCID2_MAXSIZE);
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target.nfcid2_len = NFC_NFCID2_MAXSIZE;
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rc = digital_target_found(ddev, &target, NFC_PROTO_FELICA);
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exit:
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dev_kfree_skb(resp);
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if (rc)
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digital_poll_next_tech(ddev);
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}
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int digital_in_send_sensf_req(struct nfc_digital_dev *ddev, u8 rf_tech)
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{
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struct digital_sensf_req *sensf_req;
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struct sk_buff *skb;
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int rc;
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u8 size;
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rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech);
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if (rc)
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return rc;
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rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
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NFC_DIGITAL_FRAMING_NFCF);
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if (rc)
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return rc;
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size = sizeof(struct digital_sensf_req);
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skb = digital_skb_alloc(ddev, size);
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if (!skb)
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return -ENOMEM;
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skb_put(skb, size);
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sensf_req = (struct digital_sensf_req *)skb->data;
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sensf_req->cmd = DIGITAL_CMD_SENSF_REQ;
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sensf_req->sc1 = 0xFF;
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sensf_req->sc2 = 0xFF;
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sensf_req->rc = 0;
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sensf_req->tsn = 0;
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*skb_push(skb, 1) = size + 1;
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if (!DIGITAL_DRV_CAPS_IN_CRC(ddev))
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digital_skb_add_crc_f(skb);
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rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sensf_res,
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NULL);
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if (rc)
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kfree_skb(skb);
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return rc;
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}
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