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a381d48286
linux/net/nfc/digital_technology.c
Mark A. Greer a381d48286 NFC: digital: Add Digital Layer support for ISO/IEC 15693 
Add support for ISO/IEC 15693 to the digital layer.  The code
currently uses single-slot anticollision only since the digital
layer infrastructure only supports one tag per adapter (making
it pointless to do 16-slot anticollision).

The code uses two new framing types:
'NFC_DIGITAL_FRAMING_ISO15693_INVENTORY' and
'NFC_DIGITAL_FRAMING_ISO15693_TVT'.  The former is used to
tell the driver to prepare for an Inventory command and the
ensuing anticollision sequence.  The latter is used to tell
the driver that the anticollision sequence is over and to
prepare for non-inventory commands.

Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2014-02-16 23:49:53 +01:00

880 lines
18 KiB
C
Raw Blame History

/*
* 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.
*
*/
#define pr_fmt(fmt) "digital: %s: " fmt, __func__
#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
#define DIGITAL_SEL_RES_NFCID1_COMPLETE(sel_res) (!((sel_res) & 0x04))
#define DIGITAL_SEL_RES_IS_T2T(sel_res) (!((sel_res) & 0x60))
#define DIGITAL_SEL_RES_IS_NFC_DEP(sel_res) ((sel_res) & 0x40)
#define DIGITAL_SENS_RES_IS_T1T(sens_res) (((sens_res) & 0x0C00) == 0x0C00)
#define DIGITAL_SENS_RES_IS_VALID(sens_res) \
((!((sens_res) & 0x001F) && (((sens_res) & 0x0C00) == 0x0C00)) || \
(((sens_res) & 0x001F) && ((sens_res) & 0x0C00) != 0x0C00))
#define DIGITAL_MIFARE_READ_RES_LEN 16
#define DIGITAL_MIFARE_ACK_RES 0x0A
#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
#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))
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;
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;
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;
static int digital_in_send_sdd_req(struct nfc_digital_dev *ddev,
struct nfc_target *target);
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;
}
if (DIGITAL_SEL_RES_IS_T2T(sel_res)) {
nfc_proto = NFC_PROTO_MIFARE;
} else if (DIGITAL_SEL_RES_IS_NFC_DEP(sel_res)) {
nfc_proto = NFC_PROTO_NFC_DEP;
} else {
rc = -EOPNOTSUPP;
goto exit;
}
target->sel_res = sel_res;
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);
if (!skb)
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);
}
static void digital_in_recv_sens_res(struct nfc_digital_dev *ddev, void *arg,
struct sk_buff *resp)
{
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;
}
target->sens_res = __le16_to_cpu(*(__le16 *)resp->data);
if (!DIGITAL_SENS_RES_IS_VALID(target->sens_res)) {
PROTOCOL_ERR("4.6.3.3");
rc = -EINVAL;
goto exit;
}
if (DIGITAL_SENS_RES_IS_T1T(target->sens_res))
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);
}
}
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;
}
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;
}
static void digital_in_recv_sensf_res(struct nfc_digital_dev *ddev, void *arg,
struct sk_buff *resp)
{
int rc;
u8 proto;
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;
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);
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;
}
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;
}
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);
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];
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;
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);
}
static int digital_tg_send_sensf_res(struct nfc_digital_dev *ddev,
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);
if (sensf_req->rc != DIGITAL_SENSF_REQ_RC_NONE)
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,
digital_tg_recv_atr_req, NULL);
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);
}
int digital_tg_listen_nfca(struct nfc_digital_dev *ddev, u8 rf_tech)
{
int rc;
rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech);
if (rc)
return rc;
rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
NFC_DIGITAL_FRAMING_NFCA_NFC_DEP);
if (rc)
return rc;
return digital_tg_listen(ddev, 300, digital_tg_recv_sens_req, NULL);
}
int digital_tg_listen_nfcf(struct nfc_digital_dev *ddev, u8 rf_tech)
{
int rc;
u8 *nfcid2;
rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech);
if (rc)
return rc;
rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
NFC_DIGITAL_FRAMING_NFCF_NFC_DEP);
if (rc)
return rc;
nfcid2 = kzalloc(NFC_NFCID2_MAXSIZE, GFP_KERNEL);
if (!nfcid2)
return -ENOMEM;
nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1;
nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2;
get_random_bytes(nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2);
return digital_tg_listen(ddev, 300, digital_tg_recv_sensf_req, nfcid2);
}
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