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         uint8_t                 CommandDataLen = RFCOMM_GetVariableFieldValue(&CommandData);
  46
  47         switch (CommandHeader->Command)
  48         {
  49                 case RFCOMM_Control_Test:
  50                         RFCOMM_ProcessTestCommand(CommandHeader, CommandData, Channel);
  51                         break;
  52                 case RFCOMM_Control_FlowControlEnable:
  53                         RFCOMM_ProcessFCECommand(CommandHeader, CommandData, Channel);
  54                         break;
  55                 case RFCOMM_Control_FlowControlDisable:
  56                         RFCOMM_ProcessFCDCommand(CommandHeader, CommandData, Channel);
  57                         break;
  58                 case RFCOMM_Control_ModemStatus:
  59                         RFCOMM_ProcessMSCommand(CommandHeader, CommandDataLen, CommandData, Channel);
  60                         break;
  61                 case RFCOMM_Control_RemotePortNegotiation:
  62                         RFCOMM_ProcessRPNCommand(CommandHeader, CommandData, Channel);
  63                         break;
  64                 case RFCOMM_Control_RemoteLineStatus:
  65                         RFCOMM_ProcessRLSCommand(CommandHeader, CommandData, Channel);
  66                         break;
  67                 case RFCOMM_Control_DLCParameterNegotiation:
  68                         RFCOMM_ProcessDPNCommand(CommandHeader, CommandData, Channel);
  69                         break;
  70                 default:
  71                         BT_RFCOMM_DEBUG(1, "<< Unknown Command");
  72                         break;
  73         }
  74 }
  75
  76 static void RFCOMM_ProcessTestCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
  77                                                   Bluetooth_Channel_t* const Channel)
  78 {
  79         BT_RFCOMM_DEBUG(1, "<< TEST Command");
  80 }
  81
  82 static void RFCOMM_ProcessFCECommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
  83                                                  Bluetooth_Channel_t* const Channel)
  84 {
  85         BT_RFCOMM_DEBUG(1, "<< FCE Command");
  86 }
  87
  88 static void RFCOMM_ProcessFCDCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
  89                                                  Bluetooth_Channel_t* const Channel)
  90 {
  91         BT_RFCOMM_DEBUG(1, "<< FCD Command");
  92 }
  93
  94 static void RFCOMM_ProcessMSCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t CommandDataLen,
  95                                     const uint8_t* CommandData, Bluetooth_Channel_t* const Channel)
  96 {
  97         const RFCOMM_MS_Parameters_t* Params = (const RFCOMM_MS_Parameters_t*)CommandData;
  98
  99         BT_RFCOMM_DEBUG(1, "<< MS Command");
 100         BT_RFCOMM_DEBUG(2, "-- DLCI: 0x%02X", Params->Channel.DLCI);
 101
 102         /* Ignore status flags sent to the control channel */
 103         if (Params->Channel.DLCI == RFCOMM_CONTROL_DLCI)
 104           return;
 105
 106         /* Retrieve existing channel configuration data, if already opened */
 107         RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData(Params->Channel.DLCI);
 108
 109         /* If the channel does not exist, abort */
 110         if (RFCOMMChannel == NULL)
 111           return;
 112
 113         /* Save the new channel signals to the channel state structure */
 114         RFCOMMChannel->Signals = Params->Signals;
 115
 116         /* If the command contains the optional break signals field, store the value */
 117         if (CommandDataLen == sizeof(RFCOMM_MS_Parameters_t))
 118           RFCOMMChannel->BreakSignals = Params->BreakSignals;
 119
 120         struct
 121         {
 122                 RFCOMM_Command_t       CommandHeader;
 123                 uint8_t                Length;
 124                 RFCOMM_MS_Parameters_t Params;
 125         } MSResponse;
 126
 127         /* Fill out the MS response data */
 128         MSResponse.CommandHeader = (RFCOMM_Command_t){.Command = RFCOMM_Control_ModemStatus, .EA = true};
 129         MSResponse.Length        = (CommandDataLen << 1) | 0x01;
 130         MSResponse.Params        = *Params;
 131
 132         BT_RFCOMM_DEBUG(1, ">> MS Response");
 133
 134         /* Send the PDN response to acknowledge the command */
 135         RFCOMM_SendFrame(RFCOMM_CONTROL_DLCI, false, RFCOMM_Frame_UIH, sizeof(MSResponse), &MSResponse, Channel);
 136 }
 137
 138 static void RFCOMM_ProcessRPNCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
 139                                                  Bluetooth_Channel_t* const Channel)
 140 {
 141         BT_RFCOMM_DEBUG(1, "<< RPN Command");
 142 }
 143
 144 static void RFCOMM_ProcessRLSCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
 145                                                  Bluetooth_Channel_t* const Channel)
 146 {
 147         BT_RFCOMM_DEBUG(1, "<< RLS Command");
 148 }
 149
 150 static void RFCOMM_ProcessDPNCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
 151                                                  Bluetooth_Channel_t* const Channel)
 152 {
 153         const RFCOMM_DPN_Parameters_t* Params = (const RFCOMM_DPN_Parameters_t*)CommandData;
 154
 155         BT_RFCOMM_DEBUG(1, "<< DPN Command");
 156         BT_RFCOMM_DEBUG(2, "-- DLCI: 0x%02X", Params->DLCI);
 157
 158         /* Ignore parameter negotiations to the control channel */
 159         if (Params->DLCI == RFCOMM_CONTROL_DLCI)
 160           return;
 161
 162         /* Retrieve existing channel configuration data, if already opened */
 163         RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData(Params->DLCI);
 164
 165         /* Check if the channel has no corresponding entry - remote did not open it first */
 166         if (RFCOMMChannel == NULL)
 167         {
 168                 /* Find a free entry in the RFCOMM channel multiplexer state array */
 169                 for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
 170                 {
 171                         /* If the channel's DLCI is zero, the channel state entry is free */
 172                         if (!(RFCOMM_Channels[i].DLCI))
 173                         {
 174                                 RFCOMMChannel               = &RFCOMM_Channels[i];
 175                                 RFCOMMChannel->DLCI         = Params->DLCI;
 176                                 RFCOMMChannel->Signals      = 0;
 177                                 RFCOMMChannel->BreakSignals = 0;
 178                                 break;
 179                         }
 180                 }
 181
 182                 /* No free entry was found, discard the request */
 183                 if (RFCOMMChannel == NULL)
 184                 {
 185                         BT_RFCOMM_DEBUG(2, "-- No Free Channel");
 186                         return;
 187                 }
 188         }
 189
 190         /* Save the new channel configuration */
 191         RFCOMMChannel->State       = RFCOMM_Channel_Open;
 192         RFCOMMChannel->Priority    = Params->Priority;
 193         RFCOMMChannel->UseUIFrames = (Params->FrameType != 0);
 194         RFCOMMChannel->MTU         = Params->MaximumFrameSize;
 195
 196         struct
 197         {
 198                 RFCOMM_Command_t        CommandHeader;
 199                 uint8_t                 Length;
 200                 RFCOMM_DPN_Parameters_t Params;
 201         } DPNResponse;
 202
 203         /* Fill out the DPN response data */
 204         DPNResponse.CommandHeader           = (RFCOMM_Command_t){.Command = RFCOMM_Control_DLCParameterNegotiation, .EA = true};
 205         DPNResponse.Length                  = (sizeof(DPNResponse.Params) << 1) | 0x01;
 206         DPNResponse.Params                  = *Params;
 207         DPNResponse.Params.ConvergenceLayer = 0x00; // TODO: Enable credit based transaction support
 208
 209         BT_RFCOMM_DEBUG(1, ">> DPN Response");
 210
 211         /* Send the PDN response to acknowledge the command */
 212         RFCOMM_SendFrame(RFCOMM_CONTROL_DLCI, false, RFCOMM_Frame_UIH, sizeof(DPNResponse), &DPNResponse, Channel);
 213 }