1 /******************************************************************************
2 *
3 * Copyright (C) 2010-2014 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 NCI vendor specific interface with the
22 * NFCC. 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/logging.h>
27 #include <android-base/stringprintf.h>
28 #include <string.h>
29
30 #include "gki.h"
31 #include "nfc_int.h"
32 #include "nfc_target.h"
33
34 using android::base::StringPrintf;
35
36 /****************************************************************************
37 ** Declarations
38 ****************************************************************************/
39
40 /*******************************************************************************
41 **
42 ** Function NFC_RegVSCback
43 **
44 ** Description This function is called to register or de-register a
45 ** callback function to receive Proprietary NCI response and
46 ** notification events. The maximum number of callback
47 ** functions allowed is NFC_NUM_VS_CBACKS
48 **
49 ** Returns tNFC_STATUS
50 **
51 *******************************************************************************/
NFC_RegVSCback(bool is_register,tNFC_VS_CBACK * p_cback)52 tNFC_STATUS NFC_RegVSCback(bool is_register, tNFC_VS_CBACK* p_cback) {
53 tNFC_STATUS status = NFC_STATUS_FAILED;
54 int i;
55
56 if (is_register) {
57 for (i = 0; i < NFC_NUM_VS_CBACKS; i++) {
58 /* find an empty spot to hold the callback function */
59 if (nfc_cb.p_vs_cb[i] == nullptr) {
60 nfc_cb.p_vs_cb[i] = p_cback;
61 status = NFC_STATUS_OK;
62 break;
63 }
64 }
65 } else {
66 for (i = 0; i < NFC_NUM_VS_CBACKS; i++) {
67 /* find the callback to de-register */
68 if (nfc_cb.p_vs_cb[i] == p_cback) {
69 nfc_cb.p_vs_cb[i] = nullptr;
70 status = NFC_STATUS_OK;
71 break;
72 }
73 }
74 }
75 return status;
76 }
77
78 /*******************************************************************************
79 **
80 ** Function NFC_SendRawVsCommand
81 **
82 ** Description This function is called to send the raw vendor specific
83 ** command to NFCC. The response from NFCC is reported to the
84 ** given tNFC_VS_CBACK.
85 **
86 ** Parameters p_data - The command buffer
87 **
88 ** Returns tNFC_STATUS
89 **
90 *******************************************************************************/
NFC_SendRawVsCommand(NFC_HDR * p_data,tNFC_VS_CBACK * p_cback)91 tNFC_STATUS NFC_SendRawVsCommand(NFC_HDR* p_data, tNFC_VS_CBACK* p_cback) {
92 /* Validate parameters */
93 if (p_data == nullptr || (p_data->len > NCI_MAX_VSC_SIZE)) {
94 LOG(ERROR) << StringPrintf("buffer offset must be >= %d",
95 NCI_VSC_MSG_HDR_SIZE);
96 if (p_data) GKI_freebuf(p_data);
97 return NFC_STATUS_INVALID_PARAM;
98 }
99
100 p_data->event = BT_EVT_TO_NFC_NCI;
101 p_data->layer_specific = NFC_WAIT_RSP_RAW_VS;
102 /* save the callback function in the BT_HDR, to receive the response */
103 ((tNFC_NCI_VS_MSG*)p_data)->p_cback = p_cback;
104
105 nfc_ncif_check_cmd_queue(p_data);
106 return NFC_STATUS_OK;
107 }
108
109 /*******************************************************************************
110 **
111 ** Function NFC_SendVsCommand
112 **
113 ** Description This function is called to send the given vendor specific
114 ** command to NFCC. The response from NFCC is reported to the
115 ** given tNFC_VS_CBACK as (oid).
116 **
117 ** Parameters oid - The opcode of the VS command.
118 ** p_data - The parameters for the VS command
119 **
120 ** Returns tNFC_STATUS
121 **
122 *******************************************************************************/
NFC_SendVsCommand(uint8_t oid,NFC_HDR * p_data,tNFC_VS_CBACK * p_cback)123 tNFC_STATUS NFC_SendVsCommand(uint8_t oid, NFC_HDR* p_data,
124 tNFC_VS_CBACK* p_cback) {
125 tNFC_STATUS status = NFC_STATUS_OK;
126 uint8_t* pp;
127
128 /* Allow VSC with 0-length payload */
129 if (p_data == nullptr) {
130 p_data = NCI_GET_CMD_BUF(0);
131 if (p_data) {
132 p_data->offset = NCI_VSC_MSG_HDR_SIZE;
133 p_data->len = 0;
134 }
135 }
136
137 /* Validate parameters */
138 if ((p_data == nullptr) || (p_data->offset < NCI_VSC_MSG_HDR_SIZE) ||
139 (p_data->len > NCI_MAX_VSC_SIZE)) {
140 LOG(ERROR) << StringPrintf("buffer offset must be >= %d",
141 NCI_VSC_MSG_HDR_SIZE);
142 if (p_data) GKI_freebuf(p_data);
143 return NFC_STATUS_INVALID_PARAM;
144 }
145
146 p_data->event = BT_EVT_TO_NFC_NCI;
147 p_data->layer_specific = NFC_WAIT_RSP_VSC;
148 /* save the callback function in the NFC_HDR, to receive the response */
149 ((tNFC_NCI_VS_MSG*)p_data)->p_cback = p_cback;
150
151 p_data->offset -= NCI_MSG_HDR_SIZE;
152 pp = (uint8_t*)(p_data + 1) + p_data->offset;
153 NCI_MSG_BLD_HDR0(pp, NCI_MT_CMD, NCI_GID_PROP);
154 NCI_MSG_BLD_HDR1(pp, oid);
155 *pp = (uint8_t)p_data->len;
156 p_data->len += NCI_MSG_HDR_SIZE;
157 nfc_ncif_check_cmd_queue(p_data);
158 return status;
159 }
160