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Linux/net/nfc/nci/rsp.c

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  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 

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