Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMMControl.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2010.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaim all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 /** \file
  32  *
  33  *  RFCOMM multiplexer control layer module. This module handles multiplexer
  34  *  channel commands to the control DLCI in the RFCOMM layer, to open, configure,
  35  *  test and close logical RFCOMM channels.
  36  */
  37
  38 #define  INCLUDE_FROM_RFCOMM_CONTROL_C
  39 #include "RFCOMMControl.h"
  40
  41 void RFCOMM_ProcessControlCommand(const uint8_t* Command, Bluetooth_Channel_t* const Channel)
  42 {
  43         const RFCOMM_Command_t* CommandHeader  = (const RFCOMM_Command_t*)Command;
  44         const uint8_t*          CommandData    = (const uint8_t*)Command + sizeof(RFCOMM_Command_t);
  45         uint16_t                ControlDataLen = RFCOMM_GetFrameDataLength(CommandData);
  46
  47         /* Adjust the command data pointer to skip over the variable size field */
  48         CommandData += (ControlDataLen < 128) ? 1 : 2;
  49
  50         switch (CommandHeader->Command)
  51         {
  52                 case RFCOMM_Control_Test:
  53                         RFCOMM_ProcessTestCommand(CommandHeader, CommandData, Channel);
  54                         break;
  55                 case RFCOMM_Control_FlowControlEnable:
  56                         RFCOMM_ProcessFCECommand(CommandHeader, CommandData, Channel);
  57                         break;
  58                 case RFCOMM_Control_FlowControlDisable:
  59                         RFCOMM_ProcessFCDCommand(CommandHeader, CommandData, Channel);
  60                         break;
  61                 case RFCOMM_Control_ModemStatus:
  62                         RFCOMM_ProcessMSCommand(CommandHeader, CommandData, Channel);
  63                         break;
  64                 case RFCOMM_Control_RemotePortNegotiation:
  65                         RFCOMM_ProcessRPNCommand(CommandHeader, CommandData, Channel);
  66                         break;
  67                 case RFCOMM_Control_RemoteLineStatus:
  68                         RFCOMM_ProcessRLSCommand(CommandHeader, CommandData, Channel);
  69                         break;
  70                 case RFCOMM_Control_DLCParameterNegotiation:
  71                         RFCOMM_ProcessDPNCommand(CommandHeader, CommandData, Channel);
  72                         break;
  73                 default:
  74                         BT_RFCOMM_DEBUG(1, "<< Unknown Command");
  75                         break;
  76         }
  77 }
  78
  79 static void RFCOMM_ProcessTestCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
  80                                                   Bluetooth_Channel_t* const Channel)
  81 {
  82         BT_RFCOMM_DEBUG(1, "<< TEST Command");
  83 }
  84
  85 static void RFCOMM_ProcessFCECommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
  86                                                  Bluetooth_Channel_t* const Channel)
  87 {
  88         BT_RFCOMM_DEBUG(1, "<< FCE Command");
  89 }
  90
  91 static void RFCOMM_ProcessFCDCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
  92                                                  Bluetooth_Channel_t* const Channel)
  93 {
  94         BT_RFCOMM_DEBUG(1, "<< FCD Command");
  95 }
  96
  97 static void RFCOMM_ProcessMSCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
  98                                                 Bluetooth_Channel_t* const Channel)
  99 {
 100         BT_RFCOMM_DEBUG(1, "<< MS Command");
 101 }
 102
 103 static void RFCOMM_ProcessRPNCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
 104                                                  Bluetooth_Channel_t* const Channel)
 105 {
 106         BT_RFCOMM_DEBUG(1, "<< RPN Command");
 107 }
 108
 109 static void RFCOMM_ProcessRLSCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
 110                                                  Bluetooth_Channel_t* const Channel)
 111 {
 112         BT_RFCOMM_DEBUG(1, "<< RLS Command");
 113 }
 114
 115 static void RFCOMM_ProcessDPNCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
 116                                                  Bluetooth_Channel_t* const Channel)
 117 {
 118         const RFCOMM_DPN_Parameters_t* Params = (const RFCOMM_DPN_Parameters_t*)CommandData;
 119
 120         BT_RFCOMM_DEBUG(1, "<< DPN Command");
 121         BT_RFCOMM_DEBUG(2, "-- Config DLCI: 0x%02X", Params->DLCI);
 122
 123         /* Ignore parameter negotiations to the control channel */
 124         if (Params->DLCI == RFCOMM_CONTROL_DLCI)
 125           return;
 126
 127         /* Retrieve existing channel configuration data, if already opened */
 128         RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData(Params->DLCI);
 129
 130         /* Check if the channel has no corresponding entry - remote did not open it first */
 131         if (RFCOMMChannel == NULL)
 132         {
 133                 /* Find a free entry in the RFCOMM channel multiplexer state array */
 134                 for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
 135                 {
 136                         /* If the channel's DLCI is zero, the channel state entry is free */
 137                         if (!(RFCOMM_Channels[i].DLCI))
 138                         {
 139                                 RFCOMMChannel       = &RFCOMM_Channels[i];
 140                                 RFCOMMChannel->DLCI = Params->DLCI;
 141                                 break;
 142                         }
 143                 }
 144
 145                 /* No free entry was found, discard the request */
 146                 if (RFCOMMChannel == NULL)
 147                 {
 148                         BT_RFCOMM_DEBUG(2, "-- No Free Channel");
 149                         return;
 150                 }
 151         }
 152
 153         /* Save the new channel configuration */
 154         RFCOMMChannel->State       = RFCOMM_Channel_Open;
 155         RFCOMMChannel->Priority    = Params->Priority;
 156         RFCOMMChannel->UseUIFrames = (Params->FrameType != 0);
 157         RFCOMMChannel->RemoteMTU   = Params->MaximumFrameSize;
 158
 159         struct
 160         {
 161                 RFCOMM_Command_t        CommandHeader;
 162                 uint8_t                 Length;
 163                 RFCOMM_DPN_Parameters_t Params;
 164         } DPNResponse;
 165
 166         /* Fill out the DPN response data */
 167         DPNResponse.CommandHeader.Command = CommandHeader->Command;
 168         DPNResponse.CommandHeader.EA      = true;
 169         DPNResponse.Length                = (sizeof(DPNResponse.Params) << 1) | 0x01;
 170         DPNResponse.Params                = *Params;
 171
 172         BT_RFCOMM_DEBUG(1, ">> DPN Response");
 173
 174         /* Send the PDN response to acknowledge the command */
 175         RFCOMM_SendFrame(RFCOMM_CONTROL_DLCI, false, RFCOMM_Frame_UIH, sizeof(DPNResponse), &DPNResponse, Channel);
 176 }