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, CommandDataLen, 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 CommandDataLen,
  77                                       const uint8_t* CommandData, Bluetooth_Channel_t* const Channel)
  78 {
  79         const uint8_t* Params = (const uint8_t*)CommandData;
  80
  81         BT_RFCOMM_DEBUG(1, "<< TEST Command");
  82
  83         struct
  84         {
  85                 RFCOMM_Command_t CommandHeader;
  86                 uint8_t          Length;
  87                 uint8_t          TestData[CommandDataLen];
  88         } TestResponse;
  89
  90         /* Fill out the Test response data */
  91         TestResponse.CommandHeader = (RFCOMM_Command_t){.Command = RFCOMM_Control_Test, .EA = true};
  92         TestResponse.Length        = (CommandDataLen << 1) | 0x01;
  93         memcpy(TestResponse.TestData, Params, CommandDataLen);
  94
  95         BT_RFCOMM_DEBUG(1, ">> TEST Response");
  96
  97         /* Send the PDN response to acknowledge the command */
  98         RFCOMM_SendFrame(RFCOMM_CONTROL_DLCI, false, RFCOMM_Frame_UIH, sizeof(TestResponse), &TestResponse, Channel);
  99 }
 100
 101 static void RFCOMM_ProcessFCECommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
 102                                                  Bluetooth_Channel_t* const Channel)
 103 {
 104         BT_RFCOMM_DEBUG(1, "<< FCE Command");
 105 }
 106
 107 static void RFCOMM_ProcessFCDCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
 108                                                  Bluetooth_Channel_t* const Channel)
 109 {
 110         BT_RFCOMM_DEBUG(1, "<< FCD Command");
 111 }
 112
 113 static void RFCOMM_ProcessMSCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t CommandDataLen,
 114                                     const uint8_t* CommandData, Bluetooth_Channel_t* const Channel)
 115 {
 116         const RFCOMM_MS_Parameters_t* Params = (const RFCOMM_MS_Parameters_t*)CommandData;
 117
 118         BT_RFCOMM_DEBUG(1, "<< MS Command");
 119         BT_RFCOMM_DEBUG(2, "-- DLCI: 0x%02X", Params->Channel.DLCI);
 120
 121         /* Ignore status flags sent to the control channel */
 122         if (Params->Channel.DLCI == RFCOMM_CONTROL_DLCI)
 123           return;
 124
 125         /* Retrieve existing channel configuration data, if already opened */
 126         RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData(Params->Channel.DLCI);
 127
 128         /* If the channel does not exist, abort */
 129         if (RFCOMMChannel == NULL)
 130           return;
 131
 132         /* Save the new channel signals to the channel state structure */
 133         RFCOMMChannel->Signals = Params->Signals;
 134
 135         /* If the command contains the optional break signals field, store the value */
 136         if (CommandDataLen == sizeof(RFCOMM_MS_Parameters_t))
 137           RFCOMMChannel->BreakSignals = Params->BreakSignals;
 138
 139         struct
 140         {
 141                 RFCOMM_Command_t       CommandHeader;
 142                 uint8_t                Length;
 143                 RFCOMM_MS_Parameters_t Params;
 144         } MSResponse;
 145
 146         /* Fill out the MS response data */
 147         MSResponse.CommandHeader = (RFCOMM_Command_t){.Command = RFCOMM_Control_ModemStatus, .EA = true};
 148         MSResponse.Length        = (CommandDataLen << 1) | 0x01;
 149         MSResponse.Params        = *Params;
 150
 151         BT_RFCOMM_DEBUG(1, ">> MS Response");
 152
 153         /* Send the PDN response to acknowledge the command */
 154         RFCOMM_SendFrame(RFCOMM_CONTROL_DLCI, false, RFCOMM_Frame_UIH, sizeof(MSResponse), &MSResponse, Channel);
 155 }
 156
 157 static void RFCOMM_ProcessRPNCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
 158                                                  Bluetooth_Channel_t* const Channel)
 159 {
 160         BT_RFCOMM_DEBUG(1, "<< RPN Command");
 161 }
 162
 163 static void RFCOMM_ProcessRLSCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
 164                                                  Bluetooth_Channel_t* const Channel)
 165 {
 166         BT_RFCOMM_DEBUG(1, "<< RLS Command");
 167 }
 168
 169 static void RFCOMM_ProcessDPNCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
 170                                                  Bluetooth_Channel_t* const Channel)
 171 {
 172         const RFCOMM_DPN_Parameters_t* Params = (const RFCOMM_DPN_Parameters_t*)CommandData;
 173
 174         BT_RFCOMM_DEBUG(1, "<< DPN Command");
 175         BT_RFCOMM_DEBUG(2, "-- DLCI: 0x%02X", Params->DLCI);
 176
 177         /* Ignore parameter negotiations to the control channel */
 178         if (Params->DLCI == RFCOMM_CONTROL_DLCI)
 179           return;
 180
 181         /* Retrieve existing channel configuration data, if already opened */
 182         RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData(Params->DLCI);
 183
 184         /* Check if the channel has no corresponding entry - remote did not open it first */
 185         if (RFCOMMChannel == NULL)
 186         {
 187                 /* Find a free entry in the RFCOMM channel multiplexer state array */
 188                 for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
 189                 {
 190                         /* If the channel's DLCI is zero, the channel state entry is free */
 191                         if (!(RFCOMM_Channels[i].DLCI))
 192                         {
 193                                 RFCOMMChannel               = &RFCOMM_Channels[i];
 194                                 RFCOMMChannel->DLCI         = Params->DLCI;
 195                                 RFCOMMChannel->Signals      = 0;
 196                                 RFCOMMChannel->BreakSignals = 0;
 197                                 break;
 198                         }
 199                 }
 200
 201                 /* No free entry was found, discard the request */
 202                 if (RFCOMMChannel == NULL)
 203                 {
 204                         BT_RFCOMM_DEBUG(2, "-- No Free Channel");
 205                         return;
 206                 }
 207         }
 208
 209         /* Save the new channel configuration */
 210         RFCOMMChannel->State       = RFCOMM_Channel_Open;
 211         RFCOMMChannel->Priority    = Params->Priority;
 212         RFCOMMChannel->MTU         = Params->MaximumFrameSize;
 213
 214         struct
 215         {
 216                 RFCOMM_Command_t        CommandHeader;
 217                 uint8_t                 Length;
 218                 RFCOMM_DPN_Parameters_t Params;
 219         } DPNResponse;
 220
 221         /* Fill out the DPN response data */
 222         DPNResponse.CommandHeader           = (RFCOMM_Command_t){.Command = RFCOMM_Control_DLCParameterNegotiation, .EA = true};
 223         DPNResponse.Length                  = (sizeof(DPNResponse.Params) << 1) | 0x01;
 224         DPNResponse.Params                  = *Params;
 225         DPNResponse.Params.ConvergenceLayer = 0x00; // TODO: Enable credit based transaction support
 226
 227         BT_RFCOMM_DEBUG(1, ">> DPN Response");
 228
 229         /* Send the PDN response to acknowledge the command */
 230         RFCOMM_SendFrame(RFCOMM_CONTROL_DLCI, false, RFCOMM_Frame_UIH, sizeof(DPNResponse), &DPNResponse, Channel);
 231 }