summaryrefslogtreecommitdiff
path: root/lib/lufa/Demos/Host/LowLevel/AudioInputHost/ConfigDescriptor.c
blob: 81ebf9d85ffb6d53216dfa2fcc3cf6fa824de36f (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
218
219
220
/*
             LUFA Library
     Copyright (C) Dean Camera, 2017.

  dean [at] fourwalledcubicle [dot] com
           www.lufa-lib.org
*/

/*
  Copyright 2017  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 disclaims 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
 *
 *  USB Device Configuration Descriptor processing routines, to determine the correct pipe configurations
 *  needed to communication with an attached USB device. Descriptors are special  computer-readable structures
 *  which the host requests upon device enumeration, to determine the device's capabilities and functions.
 */

#include "ConfigDescriptor.h"

/** Index of the currently used Audio Streaming Interface within the device. */
uint8_t StreamingInterfaceIndex      = 0;

/** Alternative Setting of the currently used Audio Streaming Interface within the device. */
uint8_t StreamingInterfaceAltSetting = 0;

/** Address of the streaming audio endpoint currently in use within the device. */
uint8_t StreamingEndpointAddress     = 0;


/** Reads and processes an attached device's descriptors, to determine compatibility and pipe configurations. This
 *  routine will read in the entire configuration descriptor, and configure the hosts pipes to correctly communicate
 *  with compatible devices.
 *
 *  This routine searches for a Streaming Audio interface descriptor containing a valid Isochronous audio endpoint.
 *
 *  \return An error code from the \ref AudioHost_GetConfigDescriptorDataCodes_t enum.
 */
uint8_t ProcessConfigurationDescriptor(void)
{
	uint8_t  ConfigDescriptorData[512];
	void*    CurrConfigLocation = ConfigDescriptorData;
	uint16_t CurrConfigBytesRem;

	USB_Descriptor_Interface_t* AudioControlInterface   = NULL;
	USB_Descriptor_Interface_t* AudioStreamingInterface = NULL;
	USB_Descriptor_Endpoint_t*  DataINEndpoint          = NULL;

	/* Retrieve the entire configuration descriptor into the allocated buffer */
	switch (USB_Host_GetDeviceConfigDescriptor(1, &CurrConfigBytesRem, ConfigDescriptorData, sizeof(ConfigDescriptorData)))
	{
		case HOST_GETCONFIG_Successful:
			break;
		case HOST_GETCONFIG_InvalidData:
			return InvalidConfigDataReturned;
		case HOST_GETCONFIG_BuffOverflow:
			return DescriptorTooLarge;
		default:
			return ControlError;
	}

	while (!(DataINEndpoint))
	{
		/* See if we've found a likely compatible interface, and if there is an endpoint within that interface */
		if (!(AudioControlInterface) ||
		    USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
		                              DComp_NextAudioInterfaceDataEndpoint) != DESCRIPTOR_SEARCH_COMP_Found)
		{
			/* Check if we haven't found an Audio Control interface yet, or if we have run out of related Audio Streaming interfaces */
			if (!(AudioControlInterface) ||
			    USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
			                              DComp_NextAudioStreamInterface) != DESCRIPTOR_SEARCH_COMP_Found)
			{
				/* Find a new Audio Control interface if the current one doesn't contain a compatible streaming interface */
				if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
				                              DComp_NextAudioControlInterface) != DESCRIPTOR_SEARCH_COMP_Found)
				{
					/* Descriptor not found, error out */
					return NoCompatibleInterfaceFound;
				}

				/* Save the interface in case we need to refer back to it later */
				AudioControlInterface = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Interface_t);

				/* Find the next Audio Streaming interface within that Audio Control interface */
				if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
				                              DComp_NextAudioStreamInterface) != DESCRIPTOR_SEARCH_COMP_Found)
				{
					/* Descriptor not found, error out */
					return NoCompatibleInterfaceFound;
				}
			}

			/* Save the interface in case we need to refer back to it later */
			AudioStreamingInterface = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Interface_t);

			/* Skip the remainder of the loop as we have not found an endpoint yet */
			continue;
		}

		/* Retrieve the endpoint address from the endpoint descriptor */
		USB_Descriptor_Endpoint_t* EndpointData = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Endpoint_t);

		/* Save the endpoint if it is an IN type endpoint */
		if ((EndpointData->EndpointAddress & ENDPOINT_DIR_MASK) == ENDPOINT_DIR_IN)
		  DataINEndpoint = EndpointData;
	}

	StreamingInterfaceIndex      = AudioStreamingInterface->InterfaceNumber;
	StreamingInterfaceAltSetting = AudioStreamingInterface->AlternateSetting;
	StreamingEndpointAddress     = DataINEndpoint->EndpointAddress;

	/* Configure the Audio data IN pipe */
	Pipe_ConfigurePipe(AUDIO_DATA_IN_PIPE, EP_TYPE_ISOCHRONOUS, DataINEndpoint->EndpointAddress, DataINEndpoint->EndpointSize, 2);

	/* Valid data found, return success */
	return SuccessfulConfigRead;
}

/** Descriptor comparator function. This comparator function is can be called while processing an attached USB device's
 *  configuration descriptor, to search for a specific sub descriptor. It can also be used to abort the configuration
 *  descriptor processing if an incompatible descriptor configuration is found.
 *
 *  This comparator searches for the next Interface descriptor of the correct Audio Control Class, Subclass and Protocol values.
 *
 *  \return A value from the DSEARCH_Return_ErrorCodes_t enum
 */
uint8_t DComp_NextAudioControlInterface(void* CurrentDescriptor)
{
	USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t);

	if (Header->Type == DTYPE_Interface)
	{
		USB_Descriptor_Interface_t* Interface = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Interface_t);

		if ((Interface->Class    == AUDIO_CSCP_AudioClass) &&
		    (Interface->SubClass == AUDIO_CSCP_ControlSubclass) &&
		    (Interface->Protocol == AUDIO_CSCP_ControlProtocol))
		{
			return DESCRIPTOR_SEARCH_Found;
		}
	}

	return DESCRIPTOR_SEARCH_NotFound;
}

/** Descriptor comparator function. This comparator function is can be called while processing an attached USB device's
 *  configuration descriptor, to search for a specific sub descriptor. It can also be used to abort the configuration
 *  descriptor processing if an incompatible descriptor configuration is found.
 *
 *  This comparator searches for the next Interface descriptor of the correct Audio Streaming Class, Subclass and Protocol values.
 *
 *  \return A value from the DSEARCH_Return_ErrorCodes_t enum
 */
uint8_t DComp_NextAudioStreamInterface(void* CurrentDescriptor)
{
	USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t);

	if (Header->Type == DTYPE_Interface)
	{
		USB_Descriptor_Interface_t* Interface = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Interface_t);

		if ((Interface->Class    == AUDIO_CSCP_AudioClass) &&
		    (Interface->SubClass == AUDIO_CSCP_AudioStreamingSubclass) &&
		    (Interface->Protocol == AUDIO_CSCP_StreamingProtocol))
		{
			return DESCRIPTOR_SEARCH_Found;
		}
	}

	return DESCRIPTOR_SEARCH_NotFound;
}

/** Descriptor comparator function. This comparator function is can be called while processing an attached USB device's
 *  configuration descriptor, to search for a specific sub descriptor. It can also be used to abort the configuration
 *  descriptor processing if an incompatible descriptor configuration is found.
 *
 *  This comparator searches for the next Isochronous Endpoint descriptor within the current interface, aborting the
 *  search if another interface descriptor is found before the next endpoint.
 *
 *  \return A value from the DSEARCH_Return_ErrorCodes_t enum
 */
uint8_t DComp_NextAudioInterfaceDataEndpoint(void* CurrentDescriptor)
{
	USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t);

	if (Header->Type == DTYPE_Endpoint)
	{
		USB_Descriptor_Endpoint_t* Endpoint = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Endpoint_t);

		if ((Endpoint->Attributes & EP_TYPE_MASK) == EP_TYPE_ISOCHRONOUS)
		  return DESCRIPTOR_SEARCH_Found;
	}
	else if (Header->Type == DTYPE_Interface)
	{
		return DESCRIPTOR_SEARCH_Fail;
	}

	return DESCRIPTOR_SEARCH_NotFound;
}