aboutsummaryrefslogtreecommitdiffstats
path: root/LUFA/Drivers/USB/Class/Device/MassStorage.c
blob: 04c63fca736395c674eba8ef110bbaf2018b768b (plain)
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
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
/*
             LUFA Library
     Copyright (C) Dean Camera, 2009.
              
  dean [at] fourwalledcubicle [dot] com
      www.fourwalledcubicle.com
*/

/*
  Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)

  Permission to use, copy, modify, and distribute this software
  and its documentation for any purpose and without fee is hereby
  granted, 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.
*/

#include "../../HighLevel/USBMode.h"
#if defined(USB_CAN_BE_DEVICE)

#define  INCLUDE_FROM_MS_CLASS_DEVICE_C
#include "MassStorage.h"

static USB_ClassInfo_MS_Device_t* CallbackMSInterfaceInfo;

void MS_Device_ProcessControlRequest(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
{
	if (!(Endpoint_IsSETUPReceived()))
	  return;
	  
	if (USB_ControlRequest.wIndex != MSInterfaceInfo->Config.InterfaceNumber)
	  return;

	switch (USB_ControlRequest.bRequest)
	{
		case REQ_MassStorageReset:
			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				Endpoint_ClearSETUP();

				MSInterfaceInfo->State.IsMassStoreReset = true;			

				Endpoint_ClearStatusStage();
			}

			break;
		case REQ_GetMaxLUN:
			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				Endpoint_ClearSETUP();

				Endpoint_Write_Byte(MSInterfaceInfo->Config.TotalLUNs - 1);				
				Endpoint_ClearIN();
				
				Endpoint_ClearStatusStage();
			}
			
			break;
	}
}

bool MS_Device_ConfigureEndpoints(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
{
	memset(&MSInterfaceInfo->State, 0x00, sizeof(MSInterfaceInfo->State));

	if (!(Endpoint_ConfigureEndpoint(MSInterfaceInfo->Config.DataINEndpointNumber, EP_TYPE_BULK,
							         ENDPOINT_DIR_IN, MSInterfaceInfo->Config.DataINEndpointSize,
							         ENDPOINT_BANK_SINGLE)))
	{
		return false;
	}

	if (!(Endpoint_ConfigureEndpoint(MSInterfaceInfo->Config.DataOUTEndpointNumber, EP_TYPE_BULK,
	                                 ENDPOINT_DIR_OUT, MSInterfaceInfo->Config.DataOUTEndpointSize,
	                                 ENDPOINT_BANK_SINGLE)))
	{
		return false;
	}

	return true;
}

void MS_Device_USBTask(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
{
	if (USB_DeviceState != DEVICE_STATE_Configured)
	  return;

	Endpoint_SelectEndpoint(MSInterfaceInfo->Config.DataOUTEndpointNumber);
		
	if (Endpoint_IsReadWriteAllowed())
	{
		if (MS_Device_ReadInCommandBlock(MSInterfaceInfo))
		{
			if (MSInterfaceInfo->State.CommandBlock.Flags & MS_COMMAND_DIR_DATA_IN)
			  Endpoint_SelectEndpoint(MSInterfaceInfo->Config.DataINEndpointNumber);
			  
			MSInterfaceInfo->State.CommandStatus.Status = CALLBACK_MS_Device_SCSICommandReceived(MSInterfaceInfo) ?
			                                                                 SCSI_Command_Pass : SCSI_Command_Fail;
			MSInterfaceInfo->State.CommandStatus.Signature           = MS_CSW_SIGNATURE;
			MSInterfaceInfo->State.CommandStatus.Tag                 = MSInterfaceInfo->State.CommandBlock.Tag;
			MSInterfaceInfo->State.CommandStatus.DataTransferResidue = MSInterfaceInfo->State.CommandBlock.DataTransferLength;

			if ((MSInterfaceInfo->State.CommandStatus.Status == SCSI_Command_Fail) &&
			    (MSInterfaceInfo->State.CommandStatus.DataTransferResidue))
			{
				Endpoint_StallTransaction();
			}
			
			MS_Device_ReturnCommandStatus(MSInterfaceInfo);
			
			if (MSInterfaceInfo->State.IsMassStoreReset)
			{
				Endpoint_ResetFIFO(MSInterfaceInfo->Config.DataOUTEndpointNumber);
				Endpoint_ResetFIFO(MSInterfaceInfo->Config.DataINEndpointNumber);
				
				Endpoint_SelectEndpoint(MSInterfaceInfo->Config.DataOUTEndpointNumber);
				Endpoint_ClearStall();
				Endpoint_SelectEndpoint(MSInterfaceInfo->Config.DataINEndpointNumber);
				Endpoint_ClearStall();
			}
		}
	}
	
	MSInterfaceInfo->State.IsMassStoreReset = false;
}

static bool MS_Device_ReadInCommandBlock(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
{
	Endpoint_SelectEndpoint(MSInterfaceInfo->Config.DataOUTEndpointNumber);

	CallbackMSInterfaceInfo = MSInterfaceInfo;
	Endpoint_Read_Stream_LE(&MSInterfaceInfo->State.CommandBlock,
	                        (sizeof(MS_CommandBlockWrapper_t) - 16),
	                        StreamCallback_MS_Device_AbortOnMassStoreReset);

	if ((MSInterfaceInfo->State.CommandBlock.Signature         != MS_CBW_SIGNATURE)                  ||
	    (MSInterfaceInfo->State.CommandBlock.LUN               >= MSInterfaceInfo->Config.TotalLUNs) ||
		(MSInterfaceInfo->State.CommandBlock.Flags              & 0x1F)                              ||
		(MSInterfaceInfo->State.CommandBlock.SCSICommandLength == 0)                                 ||
		(MSInterfaceInfo->State.CommandBlock.SCSICommandLength >  16))
	{
		Endpoint_StallTransaction();
		Endpoint_SelectEndpoint(MSInterfaceInfo->Config.DataINEndpointNumber);
		Endpoint_StallTransaction();
		
		return false;
	}

	CallbackMSInterfaceInfo = MSInterfaceInfo;
	Endpoint_Read_Stream_LE(&MSInterfaceInfo->State.CommandBlock.SCSICommandData,
	                        MSInterfaceInfo->State.CommandBlock.SCSICommandLength,
	                        StreamCallback_MS_Device_AbortOnMassStoreReset);
							
	Endpoint_ClearOUT();
	  
	if (MSInterfaceInfo->State.IsMassStoreReset)
	  return false;

	return true;
}

static void MS_Device_ReturnCommandStatus(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
{
	Endpoint_SelectEndpoint(MSInterfaceInfo->Config.DataOUTEndpointNumber);

	while (Endpoint_IsStalled())
	{
		USB_USBTask();

		if (MSInterfaceInfo->State.IsMassStoreReset)
		  return;
	}

	Endpoint_SelectEndpoint(MSInterfaceInfo->Config.DataINEndpointNumber);

	while (Endpoint_IsStalled())
	{
		USB_USBTask();

		if (MSInterfaceInfo->State.IsMassStoreReset)
		  return;
	}
	
	CallbackMSInterfaceInfo = MSInterfaceInfo;
	Endpoint_Write_Stream_LE(&MSInterfaceInfo->State.CommandStatus, sizeof(MS_CommandStatusWrapper_t),
	                         StreamCallback_MS_Device_AbortOnMassStoreReset);
	
	Endpoint_ClearIN();

	if (MSInterfaceInfo->State.IsMassStoreReset)
	  return;
}

static uint8_t StreamCallback_MS_Device_AbortOnMassStoreReset(void)
{
	MS_Device_USBTask(CallbackMSInterfaceInfo);

	if (CallbackMSInterfaceInfo->State.IsMassStoreReset)
	  return STREAMCALLBACK_Abort;
	else
	  return STREAMCALLBACK_Continue;
}

#endif