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, write to the Free Software 24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 25 * 26 */ 27 28 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ 29 30 #include <linux/types.h> 31 #include <linux/interrupt.h> 32 #include <linux/bitops.h> 33 #include <linux/skbuff.h> 34 35 #include "../nfc.h" 36 #include <net/nfc/nci.h> 37 #include <net/nfc/nci_core.h> 38 39 /* Handle NCI Response packets */ 40 41 static void nci_core_reset_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb) 42 { 43 struct nci_core_reset_rsp *rsp = (void *) skb->data; 44 45 pr_debug("status 0x%x\n", rsp->status); 46 47 if (rsp->status == NCI_STATUS_OK) { 48 ndev->nci_ver = rsp->nci_ver; 49 pr_debug("nci_ver 0x%x, config_status 0x%x\n", 50 rsp->nci_ver, rsp->config_status); 51 } 52 53 nci_req_complete(ndev, rsp->status); 54 } 55 56 static void nci_core_init_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb) 57 { 58 struct nci_core_init_rsp_1 *rsp_1 = (void *) skb->data; 59 struct nci_core_init_rsp_2 *rsp_2; 60 61 pr_debug("status 0x%x\n", rsp_1->status); 62 63 if (rsp_1->status != NCI_STATUS_OK) 64 goto exit; 65 66 ndev->nfcc_features = __le32_to_cpu(rsp_1->nfcc_features); 67 ndev->num_supported_rf_interfaces = rsp_1->num_supported_rf_interfaces; 68 69 if (ndev->num_supported_rf_interfaces > 70 NCI_MAX_SUPPORTED_RF_INTERFACES) { 71 ndev->num_supported_rf_interfaces = 72 NCI_MAX_SUPPORTED_RF_INTERFACES; 73 } 74 75 memcpy(ndev->supported_rf_interfaces, 76 rsp_1->supported_rf_interfaces, 77 ndev->num_supported_rf_interfaces); 78 79 rsp_2 = (void *) (skb->data + 6 + rsp_1->num_supported_rf_interfaces); 80 81 ndev->max_logical_connections = rsp_2->max_logical_connections; 82 ndev->max_routing_table_size = 83 __le16_to_cpu(rsp_2->max_routing_table_size); 84 ndev->max_ctrl_pkt_payload_len = 85 rsp_2->max_ctrl_pkt_payload_len; 86 ndev->max_size_for_large_params = 87 __le16_to_cpu(rsp_2->max_size_for_large_params); 88 ndev->manufact_id = 89 rsp_2->manufact_id; 90 ndev->manufact_specific_info = 91 __le32_to_cpu(rsp_2->manufact_specific_info); 92 93 pr_debug("nfcc_features 0x%x\n", 94 ndev->nfcc_features); 95 pr_debug("num_supported_rf_interfaces %d\n", 96 ndev->num_supported_rf_interfaces); 97 pr_debug("supported_rf_interfaces[0] 0x%x\n", 98 ndev->supported_rf_interfaces[0]); 99 pr_debug("supported_rf_interfaces[1] 0x%x\n", 100 ndev->supported_rf_interfaces[1]); 101 pr_debug("supported_rf_interfaces[2] 0x%x\n", 102 ndev->supported_rf_interfaces[2]); 103 pr_debug("supported_rf_interfaces[3] 0x%x\n", 104 ndev->supported_rf_interfaces[3]); 105 pr_debug("max_logical_connections %d\n", 106 ndev->max_logical_connections); 107 pr_debug("max_routing_table_size %d\n", 108 ndev->max_routing_table_size); 109 pr_debug("max_ctrl_pkt_payload_len %d\n", 110 ndev->max_ctrl_pkt_payload_len); 111 pr_debug("max_size_for_large_params %d\n", 112 ndev->max_size_for_large_params); 113 pr_debug("manufact_id 0x%x\n", 114 ndev->manufact_id); 115 pr_debug("manufact_specific_info 0x%x\n", 116 ndev->manufact_specific_info); 117 118 exit: 119 nci_req_complete(ndev, rsp_1->status); 120 } 121 122 static void nci_rf_disc_map_rsp_packet(struct nci_dev *ndev, 123 struct sk_buff *skb) 124 { 125 __u8 status = skb->data[0]; 126 127 pr_debug("status 0x%x\n", status); 128 129 nci_req_complete(ndev, status); 130 } 131 132 static void nci_rf_disc_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb) 133 { 134 __u8 status = skb->data[0]; 135 136 pr_debug("status 0x%x\n", status); 137 138 if (status == NCI_STATUS_OK) 139 atomic_set(&ndev->state, NCI_DISCOVERY); 140 141 nci_req_complete(ndev, status); 142 } 143 144 static void nci_rf_disc_select_rsp_packet(struct nci_dev *ndev, 145 struct sk_buff *skb) 146 { 147 __u8 status = skb->data[0]; 148 149 pr_debug("status 0x%x\n", status); 150 151 /* Complete the request on intf_activated_ntf or generic_error_ntf */ 152 if (status != NCI_STATUS_OK) 153 nci_req_complete(ndev, status); 154 } 155 156 static void nci_rf_deactivate_rsp_packet(struct nci_dev *ndev, 157 struct sk_buff *skb) 158 { 159 __u8 status = skb->data[0]; 160 161 pr_debug("status 0x%x\n", status); 162 163 /* If target was active, complete the request only in deactivate_ntf */ 164 if ((status != NCI_STATUS_OK) || 165 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) { 166 nci_clear_target_list(ndev); 167 atomic_set(&ndev->state, NCI_IDLE); 168 nci_req_complete(ndev, status); 169 } 170 } 171 172 void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb) 173 { 174 __u16 rsp_opcode = nci_opcode(skb->data); 175 176 /* we got a rsp, stop the cmd timer */ 177 del_timer(&ndev->cmd_timer); 178 179 pr_debug("NCI RX: MT=rsp, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", 180 nci_pbf(skb->data), 181 nci_opcode_gid(rsp_opcode), 182 nci_opcode_oid(rsp_opcode), 183 nci_plen(skb->data)); 184 185 /* strip the nci control header */ 186 skb_pull(skb, NCI_CTRL_HDR_SIZE); 187 188 switch (rsp_opcode) { 189 case NCI_OP_CORE_RESET_RSP: 190 nci_core_reset_rsp_packet(ndev, skb); 191 break; 192 193 case NCI_OP_CORE_INIT_RSP: 194 nci_core_init_rsp_packet(ndev, skb); 195 break; 196 197 case NCI_OP_RF_DISCOVER_MAP_RSP: 198 nci_rf_disc_map_rsp_packet(ndev, skb); 199 break; 200 201 case NCI_OP_RF_DISCOVER_RSP: 202 nci_rf_disc_rsp_packet(ndev, skb); 203 break; 204 205 case NCI_OP_RF_DISCOVER_SELECT_RSP: 206 nci_rf_disc_select_rsp_packet(ndev, skb); 207 break; 208 209 case NCI_OP_RF_DEACTIVATE_RSP: 210 nci_rf_deactivate_rsp_packet(ndev, skb); 211 break; 212 213 default: 214 pr_err("unknown rsp opcode 0x%x\n", rsp_opcode); 215 break; 216 } 217 218 kfree_skb(skb); 219 220 /* trigger the next cmd */ 221 atomic_set(&ndev->cmd_cnt, 1); 222 if (!skb_queue_empty(&ndev->cmd_q)) 223 queue_work(ndev->cmd_wq, &ndev->cmd_work); 224 } 225