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428 lines
11 KiB
428 lines
11 KiB
// 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 <[email protected]> |
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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, |
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const struct sk_buff *skb) |
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{ |
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const 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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/* Handle NCI 1.x ver */ |
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if (skb->len != 1) { |
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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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} |
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static u8 nci_core_init_rsp_packet_v1(struct nci_dev *ndev, |
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const struct sk_buff *skb) |
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{ |
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const struct nci_core_init_rsp_1 *rsp_1 = (void *)skb->data; |
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const 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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return rsp_1->status; |
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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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ndev->num_supported_rf_interfaces = |
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min((int)ndev->num_supported_rf_interfaces, |
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NCI_MAX_SUPPORTED_RF_INTERFACES); |
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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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return NCI_STATUS_OK; |
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} |
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static u8 nci_core_init_rsp_packet_v2(struct nci_dev *ndev, |
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const struct sk_buff *skb) |
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{ |
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const struct nci_core_init_rsp_nci_ver2 *rsp = (void *)skb->data; |
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const u8 *supported_rf_interface = rsp->supported_rf_interfaces; |
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u8 rf_interface_idx = 0; |
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u8 rf_extension_cnt = 0; |
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pr_debug("status %x\n", rsp->status); |
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if (rsp->status != NCI_STATUS_OK) |
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return rsp->status; |
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ndev->nfcc_features = __le32_to_cpu(rsp->nfcc_features); |
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ndev->num_supported_rf_interfaces = rsp->num_supported_rf_interfaces; |
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ndev->num_supported_rf_interfaces = |
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min((int)ndev->num_supported_rf_interfaces, |
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NCI_MAX_SUPPORTED_RF_INTERFACES); |
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while (rf_interface_idx < ndev->num_supported_rf_interfaces) { |
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ndev->supported_rf_interfaces[rf_interface_idx++] = *supported_rf_interface++; |
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/* skip rf extension parameters */ |
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rf_extension_cnt = *supported_rf_interface++; |
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supported_rf_interface += rf_extension_cnt; |
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} |
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ndev->max_logical_connections = rsp->max_logical_connections; |
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ndev->max_routing_table_size = |
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__le16_to_cpu(rsp->max_routing_table_size); |
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ndev->max_ctrl_pkt_payload_len = |
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rsp->max_ctrl_pkt_payload_len; |
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ndev->max_size_for_large_params = NCI_MAX_LARGE_PARAMS_NCI_v2; |
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return NCI_STATUS_OK; |
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} |
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static void nci_core_init_rsp_packet(struct nci_dev *ndev, const struct sk_buff *skb) |
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{ |
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u8 status = 0; |
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if (!(ndev->nci_ver & NCI_VER_2_MASK)) |
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status = nci_core_init_rsp_packet_v1(ndev, skb); |
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else |
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status = nci_core_init_rsp_packet_v2(ndev, skb); |
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if (status != NCI_STATUS_OK) |
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goto exit; |
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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, 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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const struct sk_buff *skb) |
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{ |
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const 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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const 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, |
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const 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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const 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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const 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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const struct sk_buff *skb) |
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{ |
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const 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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const 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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const 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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const 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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const 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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