RFCOMMControl.c 8.88 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
/*
             LUFA Library
     Copyright (C) Dean Camera, 2010.
              
  dean [at] fourwalledcubicle [dot] com
      www.fourwalledcubicle.com
*/

/*
  Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)

  Permission to use, copy, modify, distribute, and sell this 
  software and its documentation for any purpose is hereby granted
  without fee, provided that the above copyright notice appear in 
  all copies and that both that the copyright notice and this
  permission notice and warranty disclaimer appear in supporting 
  documentation, and that the name of the author not be used in 
  advertising or publicity pertaining to distribution of the 
  software without specific, written prior permission.

  The author disclaim all warranties with regard to this
  software, including all implied warranties of merchantability
  and fitness.  In no event shall the author be liable for any
  special, indirect or consequential damages or any damages
  whatsoever resulting from loss of use, data or profits, whether
  in an action of contract, negligence or other tortious action,
  arising out of or in connection with the use or performance of
  this software.
*/

/** \file
 *
 *  RFCOMM multiplexer control layer module. This module handles multiplexer
 *  channel commands to the control DLCI in the RFCOMM layer, to open, configure,
 *  test and close logical RFCOMM channels.
 */

#define  INCLUDE_FROM_RFCOMM_CONTROL_C
#include "RFCOMMControl.h"

void RFCOMM_ProcessControlCommand(const uint8_t* Command, Bluetooth_Channel_t* const Channel)
{
	const RFCOMM_Command_t* CommandHeader  = (const RFCOMM_Command_t*)Command;
	const uint8_t*          CommandData    = (const uint8_t*)Command + sizeof(RFCOMM_Command_t);
45
	uint8_t                 CommandDataLen = RFCOMM_GetVariableFieldValue(&CommandData);
46
47
48
49

	switch (CommandHeader->Command)
	{
		case RFCOMM_Control_Test:
50
			RFCOMM_ProcessTestCommand(CommandHeader, CommandDataLen, CommandData, Channel);
51
52
			break;
		case RFCOMM_Control_FlowControlEnable:
53
			RFCOMM_ProcessFCECommand(CommandHeader, CommandData, Channel);
54
55
			break;
		case RFCOMM_Control_FlowControlDisable:
56
			RFCOMM_ProcessFCDCommand(CommandHeader, CommandData, Channel);
57
58
			break;
		case RFCOMM_Control_ModemStatus:
59
			RFCOMM_ProcessMSCommand(CommandHeader, CommandDataLen, CommandData, Channel);
60
61
			break;
		case RFCOMM_Control_RemotePortNegotiation:
62
			RFCOMM_ProcessRPNCommand(CommandHeader, CommandData, Channel);
63
64
			break;
		case RFCOMM_Control_RemoteLineStatus:
65
			RFCOMM_ProcessRLSCommand(CommandHeader, CommandData, Channel);
66
67
			break;
		case RFCOMM_Control_DLCParameterNegotiation:
68
			RFCOMM_ProcessDPNCommand(CommandHeader, CommandData, Channel);
69
70
71
72
73
74
75
			break;
		default:
			BT_RFCOMM_DEBUG(1, "<< Unknown Command");		
			break;
	}
}

76
77
static void RFCOMM_ProcessTestCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t CommandDataLen,
                                      const uint8_t* CommandData, Bluetooth_Channel_t* const Channel)
78
{
79
80
	const uint8_t* Params = (const uint8_t*)CommandData;

81
	BT_RFCOMM_DEBUG(1, "<< TEST Command");
82
83
84
85
86
87
88
89
90
	
	struct
	{
		RFCOMM_Command_t CommandHeader;
		uint8_t          Length;
		uint8_t          TestData[CommandDataLen];
	} TestResponse;

	/* Fill out the Test response data */
91
	TestResponse.CommandHeader = (RFCOMM_Command_t){.Command = RFCOMM_Control_Test, .EA = true, .CR = false};
92
93
94
95
96
97
98
	TestResponse.Length        = (CommandDataLen << 1) | 0x01;
	memcpy(TestResponse.TestData, Params, CommandDataLen);
	
	BT_RFCOMM_DEBUG(1, ">> TEST Response");

	/* Send the PDN response to acknowledge the command */
	RFCOMM_SendFrame(RFCOMM_CONTROL_DLCI, false, RFCOMM_Frame_UIH, sizeof(TestResponse), &TestResponse, Channel);
99
100
}

101
102
static void RFCOMM_ProcessFCECommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
			                         Bluetooth_Channel_t* const Channel)
103
104
105
106
{
	BT_RFCOMM_DEBUG(1, "<< FCE Command");
}

107
108
static void RFCOMM_ProcessFCDCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
			                         Bluetooth_Channel_t* const Channel)
109
110
111
112
{
	BT_RFCOMM_DEBUG(1, "<< FCD Command");
}

113
114
static void RFCOMM_ProcessMSCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t CommandDataLen,
                                    const uint8_t* CommandData, Bluetooth_Channel_t* const Channel)
115
{
116
117
	const RFCOMM_MS_Parameters_t* Params = (const RFCOMM_MS_Parameters_t*)CommandData;

118
	BT_RFCOMM_DEBUG(1, "<< MS Command");
119
120
121
122
123
124
125
126
127
128
129
130
131
132
	BT_RFCOMM_DEBUG(2, "-- DLCI: 0x%02X", Params->Channel.DLCI);
	
	/* Ignore status flags sent to the control channel */
	if (Params->Channel.DLCI == RFCOMM_CONTROL_DLCI)
	  return;
	
	/* Retrieve existing channel configuration data, if already opened */
	RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData(Params->Channel.DLCI);	
	
	/* If the channel does not exist, abort */
	if (RFCOMMChannel == NULL)
	  return;
	  
	/* Save the new channel signals to the channel state structure */
133
	RFCOMMChannel->Remote.Signals = Params->Signals;
134
135
136
	
	/* If the command contains the optional break signals field, store the value */
	if (CommandDataLen == sizeof(RFCOMM_MS_Parameters_t))
137
	  RFCOMMChannel->Remote.BreakSignal = Params->BreakSignal;
138
139
140
141
142
143
144
145
146
	  
	struct
	{
		RFCOMM_Command_t       CommandHeader;
		uint8_t                Length;
		RFCOMM_MS_Parameters_t Params;
	} MSResponse;

	/* Fill out the MS response data */
147
148
149
	MSResponse.CommandHeader  = (RFCOMM_Command_t){.Command = RFCOMM_Control_ModemStatus, .EA = true, .CR = false};
	MSResponse.Length         = (CommandDataLen << 1) | 0x01;
	memcpy(&MSResponse.Params, Params, sizeof(RFCOMM_MS_Parameters_t));
150
151
152
153
	
	BT_RFCOMM_DEBUG(1, ">> MS Response");

	/* Send the PDN response to acknowledge the command */
154
155
	RFCOMM_SendFrame(RFCOMM_CONTROL_DLCI, false, RFCOMM_Frame_UIH,
	                 (sizeof(MSResponse) - sizeof(MSResponse.Params) + CommandDataLen), &MSResponse, Channel);
156
157
}

158
159
static void RFCOMM_ProcessRPNCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
			                         Bluetooth_Channel_t* const Channel)
160
161
162
163
{
	BT_RFCOMM_DEBUG(1, "<< RPN Command");
}

164
165
static void RFCOMM_ProcessRLSCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
			                         Bluetooth_Channel_t* const Channel)
166
167
168
169
{
	BT_RFCOMM_DEBUG(1, "<< RLS Command");
}

170
171
static void RFCOMM_ProcessDPNCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
			                         Bluetooth_Channel_t* const Channel)
172
{
173
174
	const RFCOMM_DPN_Parameters_t* Params = (const RFCOMM_DPN_Parameters_t*)CommandData;

175
	BT_RFCOMM_DEBUG(1, "<< DPN Command");
176
	BT_RFCOMM_DEBUG(2, "-- DLCI: 0x%02X", Params->DLCI);
177
	
178
179
180
	/* Ignore parameter negotiations to the control channel */
	if (Params->DLCI == RFCOMM_CONTROL_DLCI)
	  return;
181
	
182
183
184
185
	/* Retrieve existing channel configuration data, if already opened */
	RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData(Params->DLCI);
	
	/* Check if the channel has no corresponding entry - remote did not open it first */
186
187
	if (RFCOMMChannel == NULL)
	{
188
189
190
191
192
193
		/* Find a free entry in the RFCOMM channel multiplexer state array */
		for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
		{
			/* If the channel's DLCI is zero, the channel state entry is free */
			if (!(RFCOMM_Channels[i].DLCI))
			{
194
195
196
197
198
199
200
				RFCOMMChannel       = &RFCOMM_Channels[i];
				RFCOMMChannel->DLCI = Params->DLCI;
				RFCOMMChannel->MTU  = 0xFFFF;
				RFCOMMChannel->Remote.Signals     = 0 | (1 << 0);
				RFCOMMChannel->Remote.BreakSignal = 0 | (1 << 0);
				RFCOMMChannel->Local.Signals      = RFCOMM_SIGNAL_RTC | RFCOMM_SIGNAL_RTR | RFCOMM_SIGNAL_DV | (1 << 0);
				RFCOMMChannel->Local.BreakSignal  = 0 | (1 << 0);
201
202
203
204
205
206
207
208
209
210
				break;
			}
		}
		
		/* No free entry was found, discard the request */
		if (RFCOMMChannel == NULL)
		{
			BT_RFCOMM_DEBUG(2, "-- No Free Channel");
			return;
		}
211
212
	}
	
213
	/* Save the new channel configuration */
214
215
216
	RFCOMMChannel->State    = RFCOMM_Channel_Open;
	RFCOMMChannel->Priority = Params->Priority;
	RFCOMMChannel->MTU      = Params->MaximumFrameSize;
217
	
218
219
220
221
222
223
224
225
	struct
	{
		RFCOMM_Command_t        CommandHeader;
		uint8_t                 Length;
		RFCOMM_DPN_Parameters_t Params;
	} DPNResponse;
	
	/* Fill out the DPN response data */
226
	DPNResponse.CommandHeader           = (RFCOMM_Command_t){.Command = RFCOMM_Control_DLCParameterNegotiation, .EA = true, .CR = false};
227
	DPNResponse.Length                  = (sizeof(DPNResponse.Params) << 1) | 0x01;
228
	memcpy(&DPNResponse.Params, Params, sizeof(RFCOMM_DPN_Parameters_t));
229
	DPNResponse.Params.ConvergenceLayer = 0x00; // TODO: Enable credit based transaction support
230
231
232
233
234
	
	BT_RFCOMM_DEBUG(1, ">> DPN Response");

	/* Send the PDN response to acknowledge the command */
	RFCOMM_SendFrame(RFCOMM_CONTROL_DLCI, false, RFCOMM_Frame_UIH, sizeof(DPNResponse), &DPNResponse, Channel);
235
}