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OpenCloudOS-Kernel/net/nfc/nci/ntf.c

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/*
* The NFC Controller Interface is the communication protocol between an
* NFC Controller (NFCC) and a Device Host (DH).
*
* Copyright (C) 2014 Marvell International Ltd.
* Copyright (C) 2011 Texas Instruments, Inc.
*
* Written by Ilan Elias <ilane@ti.com>
*
* Acknowledgements:
* This file is based on hci_event.c, which was written
* by Maxim Krasnyansky.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation
*
* This program is distributed in the hope that 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/skbuff.h>
#include "../nfc.h"
#include <net/nfc/nci.h>
#include <net/nfc/nci_core.h>
#include <linux/nfc.h>
/* Handle NCI Notification packets */
static void nci_core_conn_credits_ntf_packet(struct nci_dev *ndev,
struct sk_buff *skb)
{
struct nci_core_conn_credit_ntf *ntf = (void *) skb->data;
int i;
pr_debug("num_entries %d\n", ntf->num_entries);
if (ntf->num_entries > NCI_MAX_NUM_CONN)
ntf->num_entries = NCI_MAX_NUM_CONN;
/* update the credits */
for (i = 0; i < ntf->num_entries; i++) {
ntf->conn_entries[i].conn_id =
nci_conn_id(&ntf->conn_entries[i].conn_id);
pr_debug("entry[%d]: conn_id %d, credits %d\n",
i, ntf->conn_entries[i].conn_id,
ntf->conn_entries[i].credits);
if (ntf->conn_entries[i].conn_id == NCI_STATIC_RF_CONN_ID) {
/* found static rf connection */
atomic_add(ntf->conn_entries[i].credits,
&ndev->credits_cnt);
}
}
/* trigger the next tx */
if (!skb_queue_empty(&ndev->tx_q))
queue_work(ndev->tx_wq, &ndev->tx_work);
}
static void nci_core_generic_error_ntf_packet(struct nci_dev *ndev,
struct sk_buff *skb)
{
__u8 status = skb->data[0];
pr_debug("status 0x%x\n", status);
if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
/* Activation failed, so complete the request
(the state remains the same) */
nci_req_complete(ndev, status);
}
}
static void nci_core_conn_intf_error_ntf_packet(struct nci_dev *ndev,
struct sk_buff *skb)
{
struct nci_core_intf_error_ntf *ntf = (void *) skb->data;
ntf->conn_id = nci_conn_id(&ntf->conn_id);
pr_debug("status 0x%x, conn_id %d\n", ntf->status, ntf->conn_id);
/* complete the data exchange transaction, if exists */
if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
nci_data_exchange_complete(ndev, NULL, -EIO);
}
static __u8 *nci_extract_rf_params_nfca_passive_poll(struct nci_dev *ndev,
struct rf_tech_specific_params_nfca_poll *nfca_poll,
__u8 *data)
{
nfca_poll->sens_res = __le16_to_cpu(*((__u16 *)data));
data += 2;
nfca_poll->nfcid1_len = min_t(__u8, *data++, NFC_NFCID1_MAXSIZE);
pr_debug("sens_res 0x%x, nfcid1_len %d\n",
nfca_poll->sens_res, nfca_poll->nfcid1_len);
memcpy(nfca_poll->nfcid1, data, nfca_poll->nfcid1_len);
data += nfca_poll->nfcid1_len;
nfca_poll->sel_res_len = *data++;
if (nfca_poll->sel_res_len != 0)
nfca_poll->sel_res = *data++;
pr_debug("sel_res_len %d, sel_res 0x%x\n",
nfca_poll->sel_res_len,
nfca_poll->sel_res);
return data;
}
static __u8 *nci_extract_rf_params_nfcb_passive_poll(struct nci_dev *ndev,
struct rf_tech_specific_params_nfcb_poll *nfcb_poll,
__u8 *data)
{
nfcb_poll->sensb_res_len = min_t(__u8, *data++, NFC_SENSB_RES_MAXSIZE);
pr_debug("sensb_res_len %d\n", nfcb_poll->sensb_res_len);
memcpy(nfcb_poll->sensb_res, data, nfcb_poll->sensb_res_len);
data += nfcb_poll->sensb_res_len;
return data;
}
static __u8 *nci_extract_rf_params_nfcf_passive_poll(struct nci_dev *ndev,
struct rf_tech_specific_params_nfcf_poll *nfcf_poll,
__u8 *data)
{
nfcf_poll->bit_rate = *data++;
nfcf_poll->sensf_res_len = min_t(__u8, *data++, NFC_SENSF_RES_MAXSIZE);
pr_debug("bit_rate %d, sensf_res_len %d\n",
nfcf_poll->bit_rate, nfcf_poll->sensf_res_len);
memcpy(nfcf_poll->sensf_res, data, nfcf_poll->sensf_res_len);
data += nfcf_poll->sensf_res_len;
return data;
}
static __u8 *nci_extract_rf_params_nfcv_passive_poll(struct nci_dev *ndev,
struct rf_tech_specific_params_nfcv_poll *nfcv_poll,
__u8 *data)
{
++data;
nfcv_poll->dsfid = *data++;
memcpy(nfcv_poll->uid, data, NFC_ISO15693_UID_MAXSIZE);
data += NFC_ISO15693_UID_MAXSIZE;
return data;
}
__u32 nci_get_prop_rf_protocol(struct nci_dev *ndev, __u8 rf_protocol)
{
if (ndev->ops->get_rfprotocol)
return ndev->ops->get_rfprotocol(ndev, rf_protocol);
return 0;
}
static int nci_add_new_protocol(struct nci_dev *ndev,
struct nfc_target *target,
__u8 rf_protocol,
__u8 rf_tech_and_mode,
void *params)
{
struct rf_tech_specific_params_nfca_poll *nfca_poll;
struct rf_tech_specific_params_nfcb_poll *nfcb_poll;
struct rf_tech_specific_params_nfcf_poll *nfcf_poll;
struct rf_tech_specific_params_nfcv_poll *nfcv_poll;
__u32 protocol;
if (rf_protocol == NCI_RF_PROTOCOL_T1T)
protocol = NFC_PROTO_JEWEL_MASK;
else if (rf_protocol == NCI_RF_PROTOCOL_T2T)
protocol = NFC_PROTO_MIFARE_MASK;
else if (rf_protocol == NCI_RF_PROTOCOL_ISO_DEP)
if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE)
protocol = NFC_PROTO_ISO14443_MASK;
else
protocol = NFC_PROTO_ISO14443_B_MASK;
else if (rf_protocol == NCI_RF_PROTOCOL_T3T)
protocol = NFC_PROTO_FELICA_MASK;
else if (rf_protocol == NCI_RF_PROTOCOL_NFC_DEP)
protocol = NFC_PROTO_NFC_DEP_MASK;
else if (rf_protocol == NCI_RF_PROTOCOL_T5T)
protocol = NFC_PROTO_ISO15693_MASK;
else
protocol = nci_get_prop_rf_protocol(ndev, rf_protocol);
if (!(protocol & ndev->poll_prots)) {
pr_err("the target found does not have the desired protocol\n");
return -EPROTO;
}
if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE) {
nfca_poll = (struct rf_tech_specific_params_nfca_poll *)params;
target->sens_res = nfca_poll->sens_res;
target->sel_res = nfca_poll->sel_res;
target->nfcid1_len = nfca_poll->nfcid1_len;
if (target->nfcid1_len > 0) {
memcpy(target->nfcid1, nfca_poll->nfcid1,
target->nfcid1_len);
}
} else if (rf_tech_and_mode == NCI_NFC_B_PASSIVE_POLL_MODE) {
nfcb_poll = (struct rf_tech_specific_params_nfcb_poll *)params;
target->sensb_res_len = nfcb_poll->sensb_res_len;
if (target->sensb_res_len > 0) {
memcpy(target->sensb_res, nfcb_poll->sensb_res,
target->sensb_res_len);
}
} else if (rf_tech_and_mode == NCI_NFC_F_PASSIVE_POLL_MODE) {
nfcf_poll = (struct rf_tech_specific_params_nfcf_poll *)params;
target->sensf_res_len = nfcf_poll->sensf_res_len;
if (target->sensf_res_len > 0) {
memcpy(target->sensf_res, nfcf_poll->sensf_res,
target->sensf_res_len);
}
} else if (rf_tech_and_mode == NCI_NFC_V_PASSIVE_POLL_MODE) {
nfcv_poll = (struct rf_tech_specific_params_nfcv_poll *)params;
target->is_iso15693 = 1;
target->iso15693_dsfid = nfcv_poll->dsfid;
memcpy(target->iso15693_uid, nfcv_poll->uid, NFC_ISO15693_UID_MAXSIZE);
} else {
pr_err("unsupported rf_tech_and_mode 0x%x\n", rf_tech_and_mode);
return -EPROTO;
}
target->supported_protocols |= protocol;
pr_debug("protocol 0x%x\n", protocol);
return 0;
}
static void nci_add_new_target(struct nci_dev *ndev,
struct nci_rf_discover_ntf *ntf)
{
struct nfc_target *target;
int i, rc;
for (i = 0; i < ndev->n_targets; i++) {
target = &ndev->targets[i];
if (target->logical_idx == ntf->rf_discovery_id) {
/* This target already exists, add the new protocol */
nci_add_new_protocol(ndev, target, ntf->rf_protocol,
ntf->rf_tech_and_mode,
&ntf->rf_tech_specific_params);
return;
}
}
/* This is a new target, check if we've enough room */
if (ndev->n_targets == NCI_MAX_DISCOVERED_TARGETS) {
pr_debug("not enough room, ignoring new target...\n");
return;
}
target = &ndev->targets[ndev->n_targets];
rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
ntf->rf_tech_and_mode,
&ntf->rf_tech_specific_params);
if (!rc) {
target->logical_idx = ntf->rf_discovery_id;
ndev->n_targets++;
pr_debug("logical idx %d, n_targets %d\n", target->logical_idx,
ndev->n_targets);
}
}
void nci_clear_target_list(struct nci_dev *ndev)
{
memset(ndev->targets, 0,
(sizeof(struct nfc_target)*NCI_MAX_DISCOVERED_TARGETS));
ndev->n_targets = 0;
}
static void nci_rf_discover_ntf_packet(struct nci_dev *ndev,
struct sk_buff *skb)
{
struct nci_rf_discover_ntf ntf;
__u8 *data = skb->data;
bool add_target = true;
ntf.rf_discovery_id = *data++;
ntf.rf_protocol = *data++;
ntf.rf_tech_and_mode = *data++;
ntf.rf_tech_specific_params_len = *data++;
pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
pr_debug("rf_tech_and_mode 0x%x\n", ntf.rf_tech_and_mode);
pr_debug("rf_tech_specific_params_len %d\n",
ntf.rf_tech_specific_params_len);
if (ntf.rf_tech_specific_params_len > 0) {
switch (ntf.rf_tech_and_mode) {
case NCI_NFC_A_PASSIVE_POLL_MODE:
data = nci_extract_rf_params_nfca_passive_poll(ndev,
&(ntf.rf_tech_specific_params.nfca_poll), data);
break;
case NCI_NFC_B_PASSIVE_POLL_MODE:
data = nci_extract_rf_params_nfcb_passive_poll(ndev,
&(ntf.rf_tech_specific_params.nfcb_poll), data);
break;
case NCI_NFC_F_PASSIVE_POLL_MODE:
data = nci_extract_rf_params_nfcf_passive_poll(ndev,
&(ntf.rf_tech_specific_params.nfcf_poll), data);
break;
case NCI_NFC_V_PASSIVE_POLL_MODE:
data = nci_extract_rf_params_nfcv_passive_poll(ndev,
&(ntf.rf_tech_specific_params.nfcv_poll), data);
break;
default:
pr_err("unsupported rf_tech_and_mode 0x%x\n",
ntf.rf_tech_and_mode);
data += ntf.rf_tech_specific_params_len;
add_target = false;
}
}
ntf.ntf_type = *data++;
pr_debug("ntf_type %d\n", ntf.ntf_type);
if (add_target == true)
nci_add_new_target(ndev, &ntf);
if (ntf.ntf_type == NCI_DISCOVER_NTF_TYPE_MORE) {
atomic_set(&ndev->state, NCI_W4_ALL_DISCOVERIES);
} else {
atomic_set(&ndev->state, NCI_W4_HOST_SELECT);
nfc_targets_found(ndev->nfc_dev, ndev->targets,
ndev->n_targets);
}
}
static int nci_extract_activation_params_iso_dep(struct nci_dev *ndev,
struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
{
struct activation_params_nfca_poll_iso_dep *nfca_poll;
struct activation_params_nfcb_poll_iso_dep *nfcb_poll;
switch (ntf->activation_rf_tech_and_mode) {
case NCI_NFC_A_PASSIVE_POLL_MODE:
nfca_poll = &ntf->activation_params.nfca_poll_iso_dep;
nfca_poll->rats_res_len = min_t(__u8, *data++, 20);
pr_debug("rats_res_len %d\n", nfca_poll->rats_res_len);
if (nfca_poll->rats_res_len > 0) {
memcpy(nfca_poll->rats_res,
data, nfca_poll->rats_res_len);
}
break;
case NCI_NFC_B_PASSIVE_POLL_MODE:
nfcb_poll = &ntf->activation_params.nfcb_poll_iso_dep;
nfcb_poll->attrib_res_len = min_t(__u8, *data++, 50);
pr_debug("attrib_res_len %d\n", nfcb_poll->attrib_res_len);
if (nfcb_poll->attrib_res_len > 0) {
memcpy(nfcb_poll->attrib_res,
data, nfcb_poll->attrib_res_len);
}
break;
default:
pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
ntf->activation_rf_tech_and_mode);
return NCI_STATUS_RF_PROTOCOL_ERROR;
}
return NCI_STATUS_OK;
}
static int nci_extract_activation_params_nfc_dep(struct nci_dev *ndev,
struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
{
struct activation_params_poll_nfc_dep *poll;
switch (ntf->activation_rf_tech_and_mode) {
case NCI_NFC_A_PASSIVE_POLL_MODE:
case NCI_NFC_F_PASSIVE_POLL_MODE:
poll = &ntf->activation_params.poll_nfc_dep;
poll->atr_res_len = min_t(__u8, *data++, 63);
pr_debug("atr_res_len %d\n", poll->atr_res_len);
if (poll->atr_res_len > 0)
memcpy(poll->atr_res, data, poll->atr_res_len);
break;
default:
pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
ntf->activation_rf_tech_and_mode);
return NCI_STATUS_RF_PROTOCOL_ERROR;
}
return NCI_STATUS_OK;
}
static void nci_target_auto_activated(struct nci_dev *ndev,
struct nci_rf_intf_activated_ntf *ntf)
{
struct nfc_target *target;
int rc;
target = &ndev->targets[ndev->n_targets];
rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
ntf->activation_rf_tech_and_mode,
&ntf->rf_tech_specific_params);
if (rc)
return;
target->logical_idx = ntf->rf_discovery_id;
ndev->n_targets++;
pr_debug("logical idx %d, n_targets %d\n",
target->logical_idx, ndev->n_targets);
nfc_targets_found(ndev->nfc_dev, ndev->targets, ndev->n_targets);
}
static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev,
struct sk_buff *skb)
{
struct nci_rf_intf_activated_ntf ntf;
__u8 *data = skb->data;
int err = NCI_STATUS_OK;
ntf.rf_discovery_id = *data++;
ntf.rf_interface = *data++;
ntf.rf_protocol = *data++;
ntf.activation_rf_tech_and_mode = *data++;
ntf.max_data_pkt_payload_size = *data++;
ntf.initial_num_credits = *data++;
ntf.rf_tech_specific_params_len = *data++;
pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
pr_debug("rf_interface 0x%x\n", ntf.rf_interface);
pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
pr_debug("activation_rf_tech_and_mode 0x%x\n",
ntf.activation_rf_tech_and_mode);
pr_debug("max_data_pkt_payload_size 0x%x\n",
ntf.max_data_pkt_payload_size);
pr_debug("initial_num_credits 0x%x\n",
ntf.initial_num_credits);
pr_debug("rf_tech_specific_params_len %d\n",
ntf.rf_tech_specific_params_len);
if (ntf.rf_tech_specific_params_len > 0) {
switch (ntf.activation_rf_tech_and_mode) {
case NCI_NFC_A_PASSIVE_POLL_MODE:
data = nci_extract_rf_params_nfca_passive_poll(ndev,
&(ntf.rf_tech_specific_params.nfca_poll), data);
break;
case NCI_NFC_B_PASSIVE_POLL_MODE:
data = nci_extract_rf_params_nfcb_passive_poll(ndev,
&(ntf.rf_tech_specific_params.nfcb_poll), data);
break;
case NCI_NFC_F_PASSIVE_POLL_MODE:
data = nci_extract_rf_params_nfcf_passive_poll(ndev,
&(ntf.rf_tech_specific_params.nfcf_poll), data);
break;
case NCI_NFC_V_PASSIVE_POLL_MODE:
data = nci_extract_rf_params_nfcv_passive_poll(ndev,
&(ntf.rf_tech_specific_params.nfcv_poll), data);
break;
default:
pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
ntf.activation_rf_tech_and_mode);
err = NCI_STATUS_RF_PROTOCOL_ERROR;
goto exit;
}
}
ntf.data_exch_rf_tech_and_mode = *data++;
ntf.data_exch_tx_bit_rate = *data++;
ntf.data_exch_rx_bit_rate = *data++;
ntf.activation_params_len = *data++;
pr_debug("data_exch_rf_tech_and_mode 0x%x\n",
ntf.data_exch_rf_tech_and_mode);
pr_debug("data_exch_tx_bit_rate 0x%x\n", ntf.data_exch_tx_bit_rate);
pr_debug("data_exch_rx_bit_rate 0x%x\n", ntf.data_exch_rx_bit_rate);
pr_debug("activation_params_len %d\n", ntf.activation_params_len);
if (ntf.activation_params_len > 0) {
switch (ntf.rf_interface) {
case NCI_RF_INTERFACE_ISO_DEP:
err = nci_extract_activation_params_iso_dep(ndev,
&ntf, data);
break;
case NCI_RF_INTERFACE_NFC_DEP:
err = nci_extract_activation_params_nfc_dep(ndev,
&ntf, data);
break;
case NCI_RF_INTERFACE_FRAME:
/* no activation params */
break;
default:
pr_err("unsupported rf_interface 0x%x\n",
ntf.rf_interface);
err = NCI_STATUS_RF_PROTOCOL_ERROR;
break;
}
}
exit:
if (err == NCI_STATUS_OK) {
ndev->max_data_pkt_payload_size = ntf.max_data_pkt_payload_size;
ndev->initial_num_credits = ntf.initial_num_credits;
/* set the available credits to initial value */
atomic_set(&ndev->credits_cnt, ndev->initial_num_credits);
/* store general bytes to be reported later in dep_link_up */
if (ntf.rf_interface == NCI_RF_INTERFACE_NFC_DEP) {
ndev->remote_gb_len = 0;
if (ntf.activation_params_len > 0) {
/* ATR_RES general bytes at offset 15 */
ndev->remote_gb_len = min_t(__u8,
(ntf.activation_params
.poll_nfc_dep.atr_res_len
- NFC_ATR_RES_GT_OFFSET),
NFC_MAX_GT_LEN);
memcpy(ndev->remote_gb,
(ntf.activation_params.poll_nfc_dep
.atr_res + NFC_ATR_RES_GT_OFFSET),
ndev->remote_gb_len);
}
}
}
if (atomic_read(&ndev->state) == NCI_DISCOVERY) {
/* A single target was found and activated automatically */
atomic_set(&ndev->state, NCI_POLL_ACTIVE);
if (err == NCI_STATUS_OK)
nci_target_auto_activated(ndev, &ntf);
} else { /* ndev->state == NCI_W4_HOST_SELECT */
/* A selected target was activated, so complete the request */
atomic_set(&ndev->state, NCI_POLL_ACTIVE);
nci_req_complete(ndev, err);
}
}
static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev,
struct sk_buff *skb)
{
struct nci_rf_deactivate_ntf *ntf = (void *) skb->data;
pr_debug("entry, type 0x%x, reason 0x%x\n", ntf->type, ntf->reason);
/* drop tx data queue */
skb_queue_purge(&ndev->tx_q);
/* drop partial rx data packet */
if (ndev->rx_data_reassembly) {
kfree_skb(ndev->rx_data_reassembly);
ndev->rx_data_reassembly = NULL;
}
/* complete the data exchange transaction, if exists */
if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
nci_data_exchange_complete(ndev, NULL, -EIO);
nci_clear_target_list(ndev);
atomic_set(&ndev->state, NCI_IDLE);
nci_req_complete(ndev, NCI_STATUS_OK);
}
void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
__u16 ntf_opcode = nci_opcode(skb->data);
pr_debug("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
nci_pbf(skb->data),
nci_opcode_gid(ntf_opcode),
nci_opcode_oid(ntf_opcode),
nci_plen(skb->data));
/* strip the nci control header */
skb_pull(skb, NCI_CTRL_HDR_SIZE);
switch (ntf_opcode) {
case NCI_OP_CORE_CONN_CREDITS_NTF:
nci_core_conn_credits_ntf_packet(ndev, skb);
break;
case NCI_OP_CORE_GENERIC_ERROR_NTF:
nci_core_generic_error_ntf_packet(ndev, skb);
break;
case NCI_OP_CORE_INTF_ERROR_NTF:
nci_core_conn_intf_error_ntf_packet(ndev, skb);
break;
case NCI_OP_RF_DISCOVER_NTF:
nci_rf_discover_ntf_packet(ndev, skb);
break;
case NCI_OP_RF_INTF_ACTIVATED_NTF:
nci_rf_intf_activated_ntf_packet(ndev, skb);
break;
case NCI_OP_RF_DEACTIVATE_NTF:
nci_rf_deactivate_ntf_packet(ndev, skb);
break;
default:
pr_err("unknown ntf opcode 0x%x\n", ntf_opcode);
break;
}
kfree_skb(skb);
}
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