1 /* 2 * The NFC Controller Interface is the communication protocol between an 3 * NFC Controller (NFCC) and a Device Host (DH). 4 * 5 * Copyright (C) 2011 Texas Instruments, Inc. 6 * 7 * Written by Ilan Elias <ilane@ti.com> 8 * 9 * Acknowledgements: 10 * This file is based on hci_event.c, which was written 11 * by Maxim Krasnyansky. 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License version 2 15 * as published by the Free Software Foundation 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, see <http://www.gnu.org/licenses/>. 24 * 25 */ 26 27 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ 28 29 #include <linux/types.h> 30 #include <linux/interrupt.h> 31 #include <linux/bitops.h> 32 #include <linux/skbuff.h> 33 34 #include "../nfc.h" 35 #include <net/nfc/nci.h> 36 #include <net/nfc/nci_core.h> 37 38 /* Handle NCI Response packets */ 39 40 static void nci_core_reset_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb) 41 { 42 struct nci_core_reset_rsp *rsp = (void *) skb->data; 43 44 pr_debug("status 0x%x\n", rsp->status); 45 46 if (rsp->status == NCI_STATUS_OK) { 47 ndev->nci_ver = rsp->nci_ver; 48 pr_debug("nci_ver 0x%x, config_status 0x%x\n", 49 rsp->nci_ver, rsp->config_status); 50 } 51 52 nci_req_complete(ndev, rsp->status); 53 } 54 55 static void nci_core_init_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb) 56 { 57 struct nci_core_init_rsp_1 *rsp_1 = (void *) skb->data; 58 struct nci_core_init_rsp_2 *rsp_2; 59 60 pr_debug("status 0x%x\n", rsp_1->status); 61 62 if (rsp_1->status != NCI_STATUS_OK) 63 goto exit; 64 65 ndev->nfcc_features = __le32_to_cpu(rsp_1->nfcc_features); 66 ndev->num_supported_rf_interfaces = rsp_1->num_supported_rf_interfaces; 67 68 if (ndev->num_supported_rf_interfaces > 69 NCI_MAX_SUPPORTED_RF_INTERFACES) { 70 ndev->num_supported_rf_interfaces = 71 NCI_MAX_SUPPORTED_RF_INTERFACES; 72 } 73 74 memcpy(ndev->supported_rf_interfaces, 75 rsp_1->supported_rf_interfaces, 76 ndev->num_supported_rf_interfaces); 77 78 rsp_2 = (void *) (skb->data + 6 + rsp_1->num_supported_rf_interfaces); 79 80 ndev->max_logical_connections = rsp_2->max_logical_connections; 81 ndev->max_routing_table_size = 82 __le16_to_cpu(rsp_2->max_routing_table_size); 83 ndev->max_ctrl_pkt_payload_len = 84 rsp_2->max_ctrl_pkt_payload_len; 85 ndev->max_size_for_large_params = 86 __le16_to_cpu(rsp_2->max_size_for_large_params); 87 ndev->manufact_id = 88 rsp_2->manufact_id; 89 ndev->manufact_specific_info = 90 __le32_to_cpu(rsp_2->manufact_specific_info); 91 92 pr_debug("nfcc_features 0x%x\n", 93 ndev->nfcc_features); 94 pr_debug("num_supported_rf_interfaces %d\n", 95 ndev->num_supported_rf_interfaces); 96 pr_debug("supported_rf_interfaces[0] 0x%x\n", 97 ndev->supported_rf_interfaces[0]); 98 pr_debug("supported_rf_interfaces[1] 0x%x\n", 99 ndev->supported_rf_interfaces[1]); 100 pr_debug("supported_rf_interfaces[2] 0x%x\n", 101 ndev->supported_rf_interfaces[2]); 102 pr_debug("supported_rf_interfaces[3] 0x%x\n", 103 ndev->supported_rf_interfaces[3]); 104 pr_debug("max_logical_connections %d\n", 105 ndev->max_logical_connections); 106 pr_debug("max_routing_table_size %d\n", 107 ndev->max_routing_table_size); 108 pr_debug("max_ctrl_pkt_payload_len %d\n", 109 ndev->max_ctrl_pkt_payload_len); 110 pr_debug("max_size_for_large_params %d\n", 111 ndev->max_size_for_large_params); 112 pr_debug("manufact_id 0x%x\n", 113 ndev->manufact_id); 114 pr_debug("manufact_specific_info 0x%x\n", 115 ndev->manufact_specific_info); 116 117 exit: 118 nci_req_complete(ndev, rsp_1->status); 119 } 120 121 static void nci_core_set_config_rsp_packet(struct nci_dev *ndev, 122 struct sk_buff *skb) 123 { 124 struct nci_core_set_config_rsp *rsp = (void *) skb->data; 125 126 pr_debug("status 0x%x\n", rsp->status); 127 128 nci_req_complete(ndev, rsp->status); 129 } 130 131 static void nci_rf_disc_map_rsp_packet(struct nci_dev *ndev, 132 struct sk_buff *skb) 133 { 134 __u8 status = skb->data[0]; 135 136 pr_debug("status 0x%x\n", status); 137 138 nci_req_complete(ndev, status); 139 } 140 141 static void nci_rf_disc_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb) 142 { 143 __u8 status = skb->data[0]; 144 145 pr_debug("status 0x%x\n", status); 146 147 if (status == NCI_STATUS_OK) 148 atomic_set(&ndev->state, NCI_DISCOVERY); 149 150 nci_req_complete(ndev, status); 151 } 152 153 static void nci_rf_disc_select_rsp_packet(struct nci_dev *ndev, 154 struct sk_buff *skb) 155 { 156 __u8 status = skb->data[0]; 157 158 pr_debug("status 0x%x\n", status); 159 160 /* Complete the request on intf_activated_ntf or generic_error_ntf */ 161 if (status != NCI_STATUS_OK) 162 nci_req_complete(ndev, status); 163 } 164 165 static void nci_rf_deactivate_rsp_packet(struct nci_dev *ndev, 166 struct sk_buff *skb) 167 { 168 __u8 status = skb->data[0]; 169 170 pr_debug("status 0x%x\n", status); 171 172 /* If target was active, complete the request only in deactivate_ntf */ 173 if ((status != NCI_STATUS_OK) || 174 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) { 175 nci_clear_target_list(ndev); 176 atomic_set(&ndev->state, NCI_IDLE); 177 nci_req_complete(ndev, status); 178 } 179 } 180 181 void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb) 182 { 183 __u16 rsp_opcode = nci_opcode(skb->data); 184 185 /* we got a rsp, stop the cmd timer */ 186 del_timer(&ndev->cmd_timer); 187 188 pr_debug("NCI RX: MT=rsp, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", 189 nci_pbf(skb->data), 190 nci_opcode_gid(rsp_opcode), 191 nci_opcode_oid(rsp_opcode), 192 nci_plen(skb->data)); 193 194 /* strip the nci control header */ 195 skb_pull(skb, NCI_CTRL_HDR_SIZE); 196 197 switch (rsp_opcode) { 198 case NCI_OP_CORE_RESET_RSP: 199 nci_core_reset_rsp_packet(ndev, skb); 200 break; 201 202 case NCI_OP_CORE_INIT_RSP: 203 nci_core_init_rsp_packet(ndev, skb); 204 break; 205 206 case NCI_OP_CORE_SET_CONFIG_RSP: 207 nci_core_set_config_rsp_packet(ndev, skb); 208 break; 209 210 case NCI_OP_RF_DISCOVER_MAP_RSP: 211 nci_rf_disc_map_rsp_packet(ndev, skb); 212 break; 213 214 case NCI_OP_RF_DISCOVER_RSP: 215 nci_rf_disc_rsp_packet(ndev, skb); 216 break; 217 218 case NCI_OP_RF_DISCOVER_SELECT_RSP: 219 nci_rf_disc_select_rsp_packet(ndev, skb); 220 break; 221 222 case NCI_OP_RF_DEACTIVATE_RSP: 223 nci_rf_deactivate_rsp_packet(ndev, skb); 224 break; 225 226 default: 227 pr_err("unknown rsp opcode 0x%x\n", rsp_opcode); 228 break; 229 } 230 231 kfree_skb(skb); 232 233 /* trigger the next cmd */ 234 atomic_set(&ndev->cmd_cnt, 1); 235 if (!skb_queue_empty(&ndev->cmd_q)) 236 queue_work(ndev->cmd_wq, &ndev->cmd_work); 237 } 238