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 = 82 rsp_2->max_logical_connections; 83 ndev->max_routing_table_size = 84 __le16_to_cpu(rsp_2->max_routing_table_size); 85 ndev->max_ctrl_pkt_payload_len = 86 rsp_2->max_ctrl_pkt_payload_len; 87 ndev->max_size_for_large_params = 88 __le16_to_cpu(rsp_2->max_size_for_large_params); 89 ndev->manufact_id = 90 rsp_2->manufact_id; 91 ndev->manufact_specific_info = 92 __le32_to_cpu(rsp_2->manufact_specific_info); 93 94 pr_debug("nfcc_features 0x%x\n", 95 ndev->nfcc_features); 96 pr_debug("num_supported_rf_interfaces %d\n", 97 ndev->num_supported_rf_interfaces); 98 pr_debug("supported_rf_interfaces[0] 0x%x\n", 99 ndev->supported_rf_interfaces[0]); 100 pr_debug("supported_rf_interfaces[1] 0x%x\n", 101 ndev->supported_rf_interfaces[1]); 102 pr_debug("supported_rf_interfaces[2] 0x%x\n", 103 ndev->supported_rf_interfaces[2]); 104 pr_debug("supported_rf_interfaces[3] 0x%x\n", 105 ndev->supported_rf_interfaces[3]); 106 pr_debug("max_logical_connections %d\n", 107 ndev->max_logical_connections); 108 pr_debug("max_routing_table_size %d\n", 109 ndev->max_routing_table_size); 110 pr_debug("max_ctrl_pkt_payload_len %d\n", 111 ndev->max_ctrl_pkt_payload_len); 112 pr_debug("max_size_for_large_params %d\n", 113 ndev->max_size_for_large_params); 114 pr_debug("manufact_id 0x%x\n", 115 ndev->manufact_id); 116 pr_debug("manufact_specific_info 0x%x\n", 117 ndev->manufact_specific_info); 118 119 exit: 120 nci_req_complete(ndev, rsp_1->status); 121 } 122 123 static void nci_rf_disc_map_rsp_packet(struct nci_dev *ndev, 124 struct sk_buff *skb) 125 { 126 __u8 status = skb->data[0]; 127 128 pr_debug("status 0x%x\n", status); 129 130 nci_req_complete(ndev, status); 131 } 132 133 static void nci_rf_disc_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb) 134 { 135 __u8 status = skb->data[0]; 136 137 pr_debug("status 0x%x\n", status); 138 139 if (status == NCI_STATUS_OK) 140 set_bit(NCI_DISCOVERY, &ndev->flags); 141 142 nci_req_complete(ndev, status); 143 } 144 145 static void nci_rf_deactivate_rsp_packet(struct nci_dev *ndev, 146 struct sk_buff *skb) 147 { 148 __u8 status = skb->data[0]; 149 150 pr_debug("status 0x%x\n", status); 151 152 clear_bit(NCI_DISCOVERY, &ndev->flags); 153 154 nci_req_complete(ndev, status); 155 } 156 157 void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb) 158 { 159 __u16 rsp_opcode = nci_opcode(skb->data); 160 161 /* we got a rsp, stop the cmd timer */ 162 del_timer(&ndev->cmd_timer); 163 164 pr_debug("NCI RX: MT=rsp, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", 165 nci_pbf(skb->data), 166 nci_opcode_gid(rsp_opcode), 167 nci_opcode_oid(rsp_opcode), 168 nci_plen(skb->data)); 169 170 /* strip the nci control header */ 171 skb_pull(skb, NCI_CTRL_HDR_SIZE); 172 173 switch (rsp_opcode) { 174 case NCI_OP_CORE_RESET_RSP: 175 nci_core_reset_rsp_packet(ndev, skb); 176 break; 177 178 case NCI_OP_CORE_INIT_RSP: 179 nci_core_init_rsp_packet(ndev, skb); 180 break; 181 182 case NCI_OP_RF_DISCOVER_MAP_RSP: 183 nci_rf_disc_map_rsp_packet(ndev, skb); 184 break; 185 186 case NCI_OP_RF_DISCOVER_RSP: 187 nci_rf_disc_rsp_packet(ndev, skb); 188 break; 189 190 case NCI_OP_RF_DEACTIVATE_RSP: 191 nci_rf_deactivate_rsp_packet(ndev, skb); 192 break; 193 194 default: 195 pr_err("unknown rsp opcode 0x%x\n", rsp_opcode); 196 break; 197 } 198 199 kfree_skb(skb); 200 201 /* trigger the next cmd */ 202 atomic_set(&ndev->cmd_cnt, 1); 203 if (!skb_queue_empty(&ndev->cmd_q)) 204 queue_work(ndev->cmd_wq, &ndev->cmd_work); 205 } 206