aboutsummaryrefslogtreecommitdiffstats
path: root/LUFA/Drivers/USB/HighLevel/ConfigDescriptor.c
blob: c9510dab9b42980c09bac3be377a4b7f93eb1991 (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
/*
             LUFA Library
     Copyright (C) Dean Camera, 2010.

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

/*
  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.
*/

#define  __INCLUDE_FROM_USB_DRIVER
#include "ConfigDescriptor.h"

#if defined(USB_CAN_BE_HOST)
uint8_t USB_Host_GetDeviceConfigDescriptor(uint8_t ConfigNumber, uint16_t* const ConfigSizePtr,
                                           void* BufferPtr, uint16_t BufferSize)
{
	uint8_t ErrorCode;
	uint8_t ConfigHeader[sizeof(USB_Descriptor_Configuration_Header_t)];

	USB_ControlRequest = (USB_Request_Header_t)
		{
			.bmRequestType = (REQDIR_DEVICETOHOST | REQTYPE_STANDARD | REQREC_DEVICE),
			.bRequest      = REQ_GetDescriptor,
			.wValue        = ((DTYPE_Configuration << 8) | (ConfigNumber - 1)),
			.wIndex        = 0,
			.wLength       = sizeof(USB_Descriptor_Configuration_Header_t),
		};

	Pipe_SelectPipe(PIPE_CONTROLPIPE);

	if ((ErrorCode = USB_Host_SendControlRequest(ConfigHeader)) != HOST_SENDCONTROL_Successful)
	  return ErrorCode;

	*ConfigSizePtr = DESCRIPTOR_PCAST(ConfigHeader, USB_Descriptor_Configuration_Header_t)->TotalConfigurationSize;

	if (*ConfigSizePtr > BufferSize)
	  return HOST_GETCONFIG_BuffOverflow;

	USB_ControlRequest.wLength = *ConfigSizePtr;

	if ((ErrorCode = USB_Host_SendControlRequest(BufferPtr)) != HOST_SENDCONTROL_Successful)
	  return ErrorCode;

	if (DESCRIPTOR_TYPE(BufferPtr) != DTYPE_Configuration)
	  return HOST_GETCONFIG_InvalidData;

	return HOST_GETCONFIG_Successful;
}
#endif

void USB_GetNextDescriptorOfType(uint16_t* const BytesRem,
                                 void** const CurrConfigLoc,
                                 const uint8_t Type)
{
	while (*BytesRem)
	{
		USB_GetNextDescriptor(BytesRem, CurrConfigLoc);

		if (DESCRIPTOR_TYPE(*CurrConfigLoc) == Type)
		  return;
	}
}

void USB_GetNextDescriptorOfTypeBefore(uint16_t* const BytesRem,
                                       void** const CurrConfigLoc,
                                       const uint8_t Type,
                                       const uint8_t BeforeType)
{
	while (*BytesRem)
	{
		USB_GetNextDescriptor(BytesRem, CurrConfigLoc);

		if (DESCRIPTOR_TYPE(*CurrConfigLoc) == Type)
		{
			return;
		}
		else if (DESCRIPTOR_TYPE(*CurrConfigLoc) == BeforeType)
		{
			*BytesRem = 0;
			return;
		}
	}
}

void USB_GetNextDescriptorOfTypeAfter(uint16_t* const BytesRem,
                                      void** const CurrConfigLoc,
                                      const uint8_t Type,
                                      const uint8_t AfterType)
{
	USB_GetNextDescriptorOfType(BytesRem, CurrConfigLoc, AfterType);

	if (*BytesRem)
	  USB_GetNextDescriptorOfType(BytesRem, CurrConfigLoc, Type);
}

uint8_t USB_GetNextDescriptorComp(uint16_t* const BytesRem, void** const CurrConfigLoc, ConfigComparatorPtr_t const ComparatorRoutine)
{
	uint8_t ErrorCode;

	while (*BytesRem)
	{
		uint8_t* PrevDescLoc  = *CurrConfigLoc;
		uint16_t PrevBytesRem = *BytesRem;

		USB_GetNextDescriptor(BytesRem, CurrConfigLoc);

		if ((ErrorCode = ComparatorRoutine(*CurrConfigLoc)) != DESCRIPTOR_SEARCH_NotFound)
		{
			if (ErrorCode == DESCRIPTOR_SEARCH_Fail)
			{
				*CurrConfigLoc = PrevDescLoc;
				*BytesRem      = PrevBytesRem;
			}

			return ErrorCode;
		}
	}

	return DESCRIPTOR_SEARCH_COMP_EndOfDescriptor;
}