// SPDX-License-Identifier: GPL-2.0-only
/*
* The NFC Controller Interface is the communication protocol between an
* NFC Controller (NFCC) and a Device Host (DH).
*
* Copyright (C) 2011 Texas Instruments, Inc.
*
* Written by Ilan Elias <[email protected]>
*
* Acknowledgements:
* This file is based on hci_event.c, which was written
* by Maxim Krasnyansky.
*/
#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>
/* Handle NCI Response packets */
static void nci_core_reset_rsp_packet(struct nci_dev *ndev,
const struct sk_buff *skb)
{
const struct nci_core_reset_rsp *rsp = (void *)skb->data;
pr_debug("status 0x%x\n", rsp->status);
/* Handle NCI 1.x ver */
if (skb->len != 1) {
if (rsp->status == NCI_STATUS_OK) {
ndev->nci_ver = rsp->nci_ver;
pr_debug("nci_ver 0x%x, config_status 0x%x\n",
rsp->nci_ver, rsp->config_status);
}
nci_req_complete(ndev, rsp->status);
}
}
static u8 nci_core_init_rsp_packet_v1(struct nci_dev *ndev,
const struct sk_buff *skb)
{
const struct nci_core_init_rsp_1 *rsp_1 = (void *)skb->data;
const struct nci_core_init_rsp_2 *rsp_2;
pr_debug("status 0x%x\n", rsp_1->status);
if (rsp_1->status != NCI_STATUS_OK)
return rsp_1->status;
ndev->nfcc_features = __le32_to_cpu(rsp_1->nfcc_features);
ndev->num_supported_rf_interfaces = rsp_1->num_supported_rf_interfaces;
ndev->num_supported_rf_interfaces =
min((int)ndev->num_supported_rf_interfaces,
NCI_MAX_SUPPORTED_RF_INTERFACES);
memcpy(ndev->supported_rf_interfaces,
rsp_1->supported_rf_interfaces,
ndev->num_supported_rf_interfaces);
rsp_2 = (void *) (skb->data + 6 + rsp_1->num_supported_rf_interfaces);
ndev->max_logical_connections = rsp_2->max_logical_connections;
ndev->max_routing_table_size =
__le16_to_cpu(rsp_2->max_routing_table_size);
ndev->max_ctrl_pkt_payload_len =
rsp_2->max_ctrl_pkt_payload_len;
ndev->max_size_for_large_params =
__le16_to_cpu(rsp_2->max_size_for_large_params);
ndev->manufact_id =
rsp_2->manufact_id;
ndev->manufact_specific_info =
__le32_to_cpu(rsp_2->manufact_specific_info);
return NCI_STATUS_OK;
}
static u8 nci_core_init_rsp_packet_v2(struct nci_dev *ndev,
const struct sk_buff *skb)
{
const struct nci_core_init_rsp_nci_ver2 *rsp = (void *)skb->data;
const u8 *supported_rf_interface = rsp->supported_rf_interfaces;
u8 rf_interface_idx = 0;
u8 rf_extension_cnt = 0;
pr_debug("status %x\n", rsp->status);
if (rsp->status != NCI_STATUS_OK)
return rsp->status;
ndev->nfcc_features = __le32_to_cpu(rsp->nfcc_features);
ndev->num_supported_rf_interfaces = rsp->num_supported_rf_interfaces;
ndev->num_supported_rf_interfaces =
min((int)ndev->num_supported_rf_interfaces,
NCI_MAX_SUPPORTED_RF_INTERFACES);
while (rf_interface_idx < ndev->num_supported_rf_interfaces) {
ndev->supported_rf_interfaces[rf_interface_idx++] = *supported_rf_interface++;
/* skip rf extension parameters */
rf_extension_cnt = *supported_rf_interface++;
supported_rf_interface += rf_extension_cnt;
}
ndev->max_logical_connections = rsp->max_logical_connections;
ndev->max_routing_table_size =
__le16_to_cpu(rsp->max_routing_table_size);
ndev->max_ctrl_pkt_payload_len =
rsp->max_ctrl_pkt_payload_len;
ndev->max_size_for_large_params = NCI_MAX_LARGE_PARAMS_NCI_v2;
return NCI_STATUS_OK;
}
static void nci_core_init_rsp_packet(struct nci_dev *ndev, const struct sk_buff *skb)
{
u8 status = 0;
if (!(ndev->nci_ver & NCI_VER_2_MASK))
status = nci_core_init_rsp_packet_v1(ndev, skb);
else
status = nci_core_init_rsp_packet_v2(ndev, skb);
if (status != NCI_STATUS_OK)
goto exit;
pr_debug("nfcc_features 0x%x\n",
ndev->nfcc_features);
pr_debug("num_supported_rf_interfaces %d\n",
ndev->num_supported_rf_interfaces);
pr_debug("supported_rf_interfaces[0] 0x%x\n",
ndev->supported_rf_interfaces[0]);
pr_debug("supported_rf_interfaces[1] 0x%x\n",
ndev->supported_rf_interfaces[1]);
pr_debug("supported_rf_interfaces[2] 0x%x\n",
ndev->supported_rf_interfaces[2]);
pr_debug("supported_rf_interfaces[3] 0x%x\n",
ndev->supported_rf_interfaces[3]);
pr_debug("max_logical_connections %d\n",
ndev->max_logical_connections);
pr_debug("max_routing_table_size %d\n",
ndev->max_routing_table_size);
pr_debug("max_ctrl_pkt_payload_len %d\n",
ndev->max_ctrl_pkt_payload_len);
pr_debug("max_size_for_large_params %d\n",
ndev->max_size_for_large_params);
pr_debug("manufact_id 0x%x\n",
ndev->manufact_id);
pr_debug("manufact_specific_info 0x%x\n",
ndev->manufact_specific_info);
exit:
nci_req_complete(ndev, status);
}
static void nci_core_set_config_rsp_packet(struct nci_dev *ndev,
const struct sk_buff *skb)
{
const struct nci_core_set_config_rsp *rsp = (void *)skb->data;
pr_debug("status 0x%x\n", rsp->status);
nci_req_complete(ndev, rsp->status);
}
static void nci_rf_disc_map_rsp_packet(struct nci_dev *ndev,
const struct sk_buff *skb)
{
__u8 status = skb->data[0];
pr_debug("status 0x%x\n", status);
nci_req_complete(ndev, status);
}
static void nci_rf_disc_rsp_packet(struct nci_dev *ndev,
const struct sk_buff *skb)
{
struct nci_conn_info *conn_info;
__u8 status = skb->data[0];
pr_debug("status 0x%x\n", status);
if (status == NCI_STATUS_OK) {
atomic_set(&ndev->state, NCI_DISCOVERY);
conn_info = ndev->rf_conn_info;
if (!conn_info) {
conn_info = devm_kzalloc(&ndev->nfc_dev->dev,
sizeof(struct nci_conn_info),
GFP_KERNEL);
if (!conn_info) {
status = NCI_STATUS_REJECTED;
goto exit;
}
conn_info->conn_id = NCI_STATIC_RF_CONN_ID;
INIT_LIST_HEAD(&conn_info->list);
list_add(&conn_info->list, &ndev->conn_info_list);
ndev->rf_conn_info = conn_info;
}
}
exit:
nci_req_complete(ndev, status);
}
static void nci_rf_disc_select_rsp_packet(struct nci_dev *ndev,
const struct sk_buff *skb)
{
__u8 status = skb->data[0];
pr_debug("status 0x%x\n", status);
/* Complete the request on intf_activated_ntf or generic_error_ntf */
if (status != NCI_STATUS_OK)
nci_req_complete(ndev, status);
}
static void nci_rf_deactivate_rsp_packet(struct nci_dev *ndev,
const struct sk_buff *skb)
{
__u8 status = skb->data[0];
pr_debug("status 0x%x\n", status);
/* If target was active, complete the request only in deactivate_ntf */
if ((status != NCI_STATUS_OK) ||
(atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
nci_clear_target_list(ndev);
atomic_set(&ndev->state, NCI_IDLE);
nci_req_complete(ndev, status);
}
}
static void nci_nfcee_discover_rsp_packet(struct nci_dev *ndev,
const struct sk_buff *skb)
{
const struct nci_nfcee_discover_rsp *discover_rsp;
if (skb->len != 2) {
nci_req_complete(ndev, NCI_STATUS_NFCEE_PROTOCOL_ERROR);
return;
}
discover_rsp = (struct nci_nfcee_discover_rsp *)skb->data;
if (discover_rsp->status != NCI_STATUS_OK ||
discover_rsp->num_nfcee == 0)
nci_req_complete(ndev, discover_rsp->status);
}
static void nci_nfcee_mode_set_rsp_packet(struct nci_dev *ndev,
const struct sk_buff *skb)
{
__u8 status = skb->data[0];
pr_debug("status 0x%x\n", status);
nci_req_complete(ndev, status);
}
static void nci_core_conn_create_rsp_packet(struct nci_dev *ndev,
const struct sk_buff *skb)
{
__u8 status = skb->data[0];
struct nci_conn_info *conn_info = NULL;
const struct nci_core_conn_create_rsp *rsp;
pr_debug("status 0x%x\n", status);
if (status == NCI_STATUS_OK) {
rsp = (struct nci_core_conn_create_rsp *)skb->data;
conn_info = devm_kzalloc(&ndev->nfc_dev->dev,
sizeof(*conn_info), GFP_KERNEL);
if (!conn_info) {
status = NCI_STATUS_REJECTED;
goto exit;
}
conn_info->dest_params = devm_kzalloc(&ndev->nfc_dev->dev,
sizeof(struct dest_spec_params),
GFP_KERNEL);
if (!conn_info->dest_params) {
status = NCI_STATUS_REJECTED;
goto free_conn_info;
}
conn_info->dest_type = ndev->cur_dest_type;
conn_info->dest_params->id = ndev->cur_params.id;
conn_info->dest_params->protocol = ndev->cur_params.protocol;
conn_info->conn_id = rsp->conn_id;
/* Note: data_exchange_cb and data_exchange_cb_context need to
* be specify out of nci_core_conn_create_rsp_packet
*/
INIT_LIST_HEAD(&conn_info->list);
list_add(&conn_info->list, &ndev->conn_info_list);
if (ndev->cur_params.id == ndev->hci_dev->nfcee_id)
ndev->hci_dev->conn_info = conn_info;
conn_info->conn_id = rsp->conn_id;
conn_info->max_pkt_payload_len = rsp->max_ctrl_pkt_payload_len;
atomic_set(&conn_info->credits_cnt, rsp->credits_cnt);
}
free_conn_info:
if (status == NCI_STATUS_REJECTED)
devm_kfree(&ndev->nfc_dev->dev, conn_info);
exit:
nci_req_complete(ndev, status);
}
static void nci_core_conn_close_rsp_packet(struct nci_dev *ndev,
const struct sk_buff *skb)
{
struct nci_conn_info *conn_info;
__u8 status = skb->data[0];
pr_debug("status 0x%x\n", status);
if (status == NCI_STATUS_OK) {
conn_info = nci_get_conn_info_by_conn_id(ndev,
ndev->cur_conn_id);
if (conn_info) {
list_del(&conn_info->list);
if (conn_info == ndev->rf_conn_info)
ndev->rf_conn_info = NULL;
devm_kfree(&ndev->nfc_dev->dev, conn_info);
}
}
nci_req_complete(ndev, status);
}
void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
__u16 rsp_opcode = nci_opcode(skb->data);
/* we got a rsp, stop the cmd timer */
del_timer(&ndev->cmd_timer);
pr_debug("NCI RX: MT=rsp, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
nci_pbf(skb->data),
nci_opcode_gid(rsp_opcode),
nci_opcode_oid(rsp_opcode),
nci_plen(skb->data));
/* strip the nci control header */
skb_pull(skb, NCI_CTRL_HDR_SIZE);
if (nci_opcode_gid(rsp_opcode) == NCI_GID_PROPRIETARY) {
if (nci_prop_rsp_packet(ndev, rsp_opcode, skb) == -ENOTSUPP) {
pr_err("unsupported rsp opcode 0x%x\n",
rsp_opcode);
}
goto end;
}
switch (rsp_opcode) {
case NCI_OP_CORE_RESET_RSP:
nci_core_reset_rsp_packet(ndev, skb);
break;
case NCI_OP_CORE_INIT_RSP:
nci_core_init_rsp_packet(ndev, skb);
break;
case NCI_OP_CORE_SET_CONFIG_RSP:
nci_core_set_config_rsp_packet(ndev, skb);
break;
case NCI_OP_CORE_CONN_CREATE_RSP:
nci_core_conn_create_rsp_packet(ndev, skb);
break;
case NCI_OP_CORE_CONN_CLOSE_RSP:
nci_core_conn_close_rsp_packet(ndev, skb);
break;
case NCI_OP_RF_DISCOVER_MAP_RSP:
nci_rf_disc_map_rsp_packet(ndev, skb);
break;
case NCI_OP_RF_DISCOVER_RSP:
nci_rf_disc_rsp_packet(ndev, skb);
break;
case NCI_OP_RF_DISCOVER_SELECT_RSP:
nci_rf_disc_select_rsp_packet(ndev, skb);
break;
case NCI_OP_RF_DEACTIVATE_RSP:
nci_rf_deactivate_rsp_packet(ndev, skb);
break;
case NCI_OP_NFCEE_DISCOVER_RSP:
nci_nfcee_discover_rsp_packet(ndev, skb);
break;
case NCI_OP_NFCEE_MODE_SET_RSP:
nci_nfcee_mode_set_rsp_packet(ndev, skb);
break;
default:
pr_err("unknown rsp opcode 0x%x\n", rsp_opcode);
break;
}
nci_core_rsp_packet(ndev, rsp_opcode, skb);
end:
kfree_skb(skb);
/* trigger the next cmd */
atomic_set(&ndev->cmd_cnt, 1);
if (!skb_queue_empty(&ndev->cmd_q))
queue_work(ndev->cmd_wq, &ndev->cmd_work);
}
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