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