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      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 <string.h>
     27 #include "gki.h"
     28 #include "nfc_target.h"
     29 
     30 #include "nfc_int.h"
     31 
     32 /****************************************************************************
     33 ** Declarations
     34 ****************************************************************************/
     35 
     36 /*******************************************************************************
     37 **
     38 ** Function         NFC_RegVSCback
     39 **
     40 ** Description      This function is called to register or de-register a
     41 **                  callback function to receive Proprietary NCI response and
     42 **                  notification events. The maximum number of callback
     43 **                  functions allowed is NFC_NUM_VS_CBACKS
     44 **
     45 ** Returns          tNFC_STATUS
     46 **
     47 *******************************************************************************/
     48 tNFC_STATUS NFC_RegVSCback(bool is_register, tNFC_VS_CBACK* p_cback) {
     49   tNFC_STATUS status = NFC_STATUS_FAILED;
     50   int i;
     51 
     52   if (is_register) {
     53     for (i = 0; i < NFC_NUM_VS_CBACKS; i++) {
     54       /* find an empty spot to hold the callback function */
     55       if (nfc_cb.p_vs_cb[i] == NULL) {
     56         nfc_cb.p_vs_cb[i] = p_cback;
     57         status = NFC_STATUS_OK;
     58         break;
     59       }
     60     }
     61   } else {
     62     for (i = 0; i < NFC_NUM_VS_CBACKS; i++) {
     63       /* find the callback to de-register */
     64       if (nfc_cb.p_vs_cb[i] == p_cback) {
     65         nfc_cb.p_vs_cb[i] = NULL;
     66         status = NFC_STATUS_OK;
     67         break;
     68       }
     69     }
     70   }
     71   return status;
     72 }
     73 
     74 /*******************************************************************************
     75 **
     76 ** Function         NFC_SendVsCommand
     77 **
     78 ** Description      This function is called to send the given vendor specific
     79 **                  command to NFCC. The response from NFCC is reported to the
     80 **                  given tNFC_VS_CBACK as (oid).
     81 **
     82 ** Parameters       oid - The opcode of the VS command.
     83 **                  p_data - The parameters for the VS command
     84 **
     85 ** Returns          tNFC_STATUS
     86 **
     87 *******************************************************************************/
     88 tNFC_STATUS NFC_SendVsCommand(uint8_t oid, NFC_HDR* p_data,
     89                               tNFC_VS_CBACK* p_cback) {
     90   tNFC_STATUS status = NFC_STATUS_OK;
     91   uint8_t* pp;
     92 
     93   /* Allow VSC with 0-length payload */
     94   if (p_data == NULL) {
     95     p_data = NCI_GET_CMD_BUF(0);
     96     if (p_data) {
     97       p_data->offset = NCI_VSC_MSG_HDR_SIZE;
     98       p_data->len = 0;
     99     }
    100   }
    101 
    102   /* Validate parameters */
    103   if ((p_data == NULL) || (p_data->offset < NCI_VSC_MSG_HDR_SIZE) ||
    104       (p_data->len > NCI_MAX_VSC_SIZE)) {
    105     NFC_TRACE_ERROR1("buffer offset must be >= %d", NCI_VSC_MSG_HDR_SIZE);
    106     if (p_data) GKI_freebuf(p_data);
    107     return NFC_STATUS_INVALID_PARAM;
    108   }
    109 
    110   p_data->event = BT_EVT_TO_NFC_NCI;
    111   p_data->layer_specific = NFC_WAIT_RSP_VSC;
    112   /* save the callback function in the NFC_HDR, to receive the response */
    113   ((tNFC_NCI_VS_MSG*)p_data)->p_cback = p_cback;
    114 
    115   p_data->offset -= NCI_MSG_HDR_SIZE;
    116   pp = (uint8_t*)(p_data + 1) + p_data->offset;
    117   NCI_MSG_BLD_HDR0(pp, NCI_MT_CMD, NCI_GID_PROP);
    118   NCI_MSG_BLD_HDR1(pp, oid);
    119   *pp = (uint8_t)p_data->len;
    120   p_data->len += NCI_MSG_HDR_SIZE;
    121   nfc_ncif_check_cmd_queue(p_data);
    122   return status;
    123 }
    124