| /* |
| * 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 <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> |
| |
| /* Handle NCI Response packets */ |
| |
| static void nci_core_reset_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb) |
| { |
| struct nci_core_reset_rsp *rsp = (void *) skb->data; |
| |
| pr_debug("status 0x%x\n", rsp->status); |
| |
| 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 void nci_core_init_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb) |
| { |
| struct nci_core_init_rsp_1 *rsp_1 = (void *) skb->data; |
| struct nci_core_init_rsp_2 *rsp_2; |
| |
| pr_debug("status 0x%x\n", rsp_1->status); |
| |
| if (rsp_1->status != NCI_STATUS_OK) |
| goto exit; |
| |
| ndev->nfcc_features = __le32_to_cpu(rsp_1->nfcc_features); |
| ndev->num_supported_rf_interfaces = rsp_1->num_supported_rf_interfaces; |
| |
| if (ndev->num_supported_rf_interfaces > |
| NCI_MAX_SUPPORTED_RF_INTERFACES) { |
| 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); |
| |
| 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, rsp_1->status); |
| } |
| |
| static void nci_core_set_config_rsp_packet(struct nci_dev *ndev, |
| struct sk_buff *skb) |
| { |
| 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, |
| 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, 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, |
| 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, |
| 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, |
| struct sk_buff *skb) |
| { |
| 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, |
| 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, |
| struct sk_buff *skb) |
| { |
| __u8 status = skb->data[0]; |
| struct nci_conn_info *conn_info; |
| 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->id = ndev->cur_id; |
| 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_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); |
| } |
| |
| exit: |
| nci_req_complete(ndev, status); |
| } |
| |
| static void nci_core_conn_close_rsp_packet(struct nci_dev *ndev, |
| 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_id); |
| if (conn_info) { |
| list_del(&conn_info->list); |
| 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; |
| } |
| |
| 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); |
| } |