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1 /******************************************************************************
2  *
3  *  Copyright (C) 2009-2014 Broadcom Corporation
4  *
5  *  Licensed under the Apache License, Version 2.0 (the "License");
6  *  you may not use this file except in compliance with the License.
7  *  You may obtain a copy of the License at:
8  *
9  *  http://www.apache.org/licenses/LICENSE-2.0
10  *
11  *  Unless required by applicable law or agreed to in writing, software
12  *  distributed under the License is distributed on an "AS IS" BASIS,
13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  *  See the License for the specific language governing permissions and
15  *  limitations under the License.
16  *
17  ******************************************************************************/
18 
19 /******************************************************************************
20  *
21  *  This file contains functions that interface with the NFC NCI transport.
22  *  On the receive side, it routes events to the appropriate handler
23  *  (callback). On the transmit side, it manages the command transmission.
24  *
25  ******************************************************************************/
26 #include <android-base/stringprintf.h>
27 #include <base/logging.h>
28 #include <log/log.h>
29 #include <string.h>
30 
31 #include "bt_types.h"
32 #include "ce_api.h"
33 #include "ce_int.h"
34 #include "nfc_target.h"
35 
36 using android::base::StringPrintf;
37 
38 extern bool nfc_debug_enabled;
39 
40 tCE_CB ce_cb;
41 
42 /*******************************************************************************
43 *******************************************************************************/
ce_init(void)44 void ce_init(void) {
45   memset(&ce_cb, 0, sizeof(tCE_CB));
46 
47   /* Initialize tag-specific fields of ce control block */
48   ce_t3t_init();
49 }
50 
51 /*******************************************************************************
52 **
53 ** Function         CE_SendRawFrame
54 **
55 ** Description      This function sends a raw frame to the peer device.
56 **
57 ** Returns          tNFC_STATUS
58 **
59 *******************************************************************************/
CE_SendRawFrame(uint8_t * p_raw_data,uint16_t data_len)60 tNFC_STATUS CE_SendRawFrame(uint8_t* p_raw_data, uint16_t data_len) {
61   tNFC_STATUS status = NFC_STATUS_FAILED;
62   NFC_HDR* p_data;
63   uint8_t* p;
64 
65   if (ce_cb.p_cback) {
66     if (data_len > GKI_get_pool_bufsize(NFC_RW_POOL_ID) - NCI_MSG_OFFSET_SIZE -
67                        NCI_DATA_HDR_SIZE - 1) {
68       android_errorWriteLog(0x534e4554, "157649398");
69       return NFC_STATUS_FAILED;
70     }
71 
72     /* a valid opcode for RW */
73     p_data = (NFC_HDR*)GKI_getpoolbuf(NFC_RW_POOL_ID);
74     if (p_data) {
75       p_data->offset = NCI_MSG_OFFSET_SIZE + NCI_DATA_HDR_SIZE;
76       p = (uint8_t*)(p_data + 1) + p_data->offset;
77       memcpy(p, p_raw_data, data_len);
78       p_data->len = data_len;
79       DLOG_IF(INFO, nfc_debug_enabled)
80           << StringPrintf("CE SENT raw frame (0x%x)", data_len);
81       status = NFC_SendData(NFC_RF_CONN_ID, p_data);
82     }
83   }
84   return status;
85 }
86 
87 /*******************************************************************************
88 **
89 ** Function         CE_SetActivatedTagType
90 **
91 ** Description      This function selects the tag type for CE mode.
92 **
93 ** Returns          tNFC_STATUS
94 **
95 *******************************************************************************/
CE_SetActivatedTagType(tNFC_ACTIVATE_DEVT * p_activate_params,uint16_t t3t_system_code,tCE_CBACK * p_cback)96 tNFC_STATUS CE_SetActivatedTagType(tNFC_ACTIVATE_DEVT* p_activate_params,
97                                    uint16_t t3t_system_code,
98                                    tCE_CBACK* p_cback) {
99   tNFC_STATUS status = NFC_STATUS_FAILED;
100   tNFC_PROTOCOL protocol = p_activate_params->protocol;
101 
102   DLOG_IF(INFO, nfc_debug_enabled)
103       << StringPrintf("CE_SetActivatedTagType protocol:%d", protocol);
104 
105   switch (protocol) {
106     case NFC_PROTOCOL_T1T:
107     case NFC_PROTOCOL_T2T:
108       return NFC_STATUS_FAILED;
109 
110     case NFC_PROTOCOL_T3T: /* Type3Tag    - NFC-F */
111       /* store callback function before NFC_SetStaticRfCback () */
112       ce_cb.p_cback = p_cback;
113       status = ce_select_t3t(t3t_system_code,
114                              p_activate_params->rf_tech_param.param.lf.nfcid2);
115       break;
116 
117     case NFC_PROTOCOL_ISO_DEP: /* ISODEP/4A,4B- NFC-A or NFC-B */
118       /* store callback function before NFC_SetStaticRfCback () */
119       ce_cb.p_cback = p_cback;
120       status = ce_select_t4t();
121       break;
122 
123     default:
124       LOG(ERROR) << StringPrintf("CE_SetActivatedTagType Invalid protocol");
125       return NFC_STATUS_FAILED;
126   }
127 
128   if (status != NFC_STATUS_OK) {
129     NFC_SetStaticRfCback(nullptr);
130     ce_cb.p_cback = nullptr;
131   }
132   return status;
133 }
134