protocol/lufa/LUFA-git/Projects/MediaController/Descriptors.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2014.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2014  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 disclaims 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  *  USB Device Descriptors, for library use when in USB device mode. Descriptors are special
  34  *  computer-readable structures which the host requests upon device enumeration, to determine
  35  *  the device's capabilities and functions.
  36  */
  37
  38 #include "Descriptors.h"
  39
  40 /** HID class report descriptor. This is a special descriptor constructed with values from the
  41  *  USBIF HID class specification to describe the reports and capabilities of the HID device. This
  42  *  descriptor is parsed by the host and its contents used to determine what data (and in what encoding)
  43  *  the device will send, and what it may be sent back from the host. Refer to the HID specification for
  44  *  more details on HID report descriptors.
  45  */
  46 const USB_Descriptor_HIDReport_Datatype_t PROGMEM MediaControlReport[] =
  47 {
  48         HID_RI_USAGE_PAGE(8, 0x0C), /* Consumer Page */
  49         HID_RI_USAGE(8, 0x01), /* Consumer Controls */
  50         HID_RI_COLLECTION(8, 0x01), /* Application */
  51                 HID_RI_USAGE(8, 0xB0), /* Play */
  52                 HID_RI_USAGE(8, 0xB1), /* Pause */
  53                 HID_RI_USAGE(8, 0xB3), /* Fast Forward */
  54                 HID_RI_USAGE(8, 0xB4), /* Rewind */
  55                 HID_RI_USAGE(8, 0xB5), /* Next Track */
  56                 HID_RI_USAGE(8, 0xB6), /* Previous Track */
  57                 HID_RI_USAGE(8, 0xB7), /* Stop */
  58                 HID_RI_USAGE(8, 0xCD), /* Play/Pause (toggle) */
  59                 HID_RI_USAGE(8, 0xE2), /* Mute */
  60                 HID_RI_USAGE(8, 0xE9), /* Volume Up */
  61                 HID_RI_USAGE(8, 0xEA), /* Volume Down */
  62                 HID_RI_REPORT_SIZE(8, 0x01),
  63                 HID_RI_REPORT_COUNT(8, 0x0B),
  64                 HID_RI_LOGICAL_MINIMUM(8, 0),
  65                 HID_RI_LOGICAL_MAXIMUM(8, 1),
  66                 HID_RI_INPUT(8, HID_IOF_DATA | HID_IOF_VARIABLE | HID_IOF_RELATIVE),
  67                 HID_RI_REPORT_COUNT(8, 0x05),
  68                 HID_RI_INPUT(8, HID_IOF_CONSTANT),
  69         HID_RI_END_COLLECTION(0),
  70 };
  71
  72 /** Device descriptor structure. This descriptor, located in FLASH memory, describes the overall
  73  *  device characteristics, including the supported USB version, control endpoint size and the
  74  *  number of device configurations. The descriptor is read out by the USB host when the enumeration
  75  *  process begins.
  76  */
  77 const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
  78 {
  79         .Header                 = {.Size = sizeof(USB_Descriptor_Device_t), .Type = DTYPE_Device},
  80
  81         .USBSpecification       = VERSION_BCD(1,1,0),
  82         .Class                  = USB_CSCP_NoDeviceClass,
  83         .SubClass               = USB_CSCP_NoDeviceSubclass,
  84         .Protocol               = USB_CSCP_NoDeviceProtocol,
  85
  86         .Endpoint0Size          = FIXED_CONTROL_ENDPOINT_SIZE,
  87
  88         .VendorID               = 0x03EB,
  89         .ProductID              = 0x206A,
  90         .ReleaseNumber          = VERSION_BCD(0,0,1),
  91
  92         .ManufacturerStrIndex   = STRING_ID_Manufacturer,
  93         .ProductStrIndex        = STRING_ID_Product,
  94         .SerialNumStrIndex      = NO_DESCRIPTOR,
  95
  96         .NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
  97 };
  98
  99 /** Configuration descriptor structure. This descriptor, located in FLASH memory, describes the usage
 100  *  of the device in one of its supported configurations, including information about any device interfaces
 101  *  and endpoints. The descriptor is read out by the USB host during the enumeration process when selecting
 102  *  a configuration so that the host may correctly communicate with the USB device.
 103  */
 104 const USB_Descriptor_Configuration_t PROGMEM ConfigurationDescriptor =
 105 {
 106         .Config =
 107                 {
 108                         .Header                 = {.Size = sizeof(USB_Descriptor_Configuration_Header_t), .Type = DTYPE_Configuration},
 109
 110                         .TotalConfigurationSize = sizeof(USB_Descriptor_Configuration_t),
 111                         .TotalInterfaces        = 1,
 112
 113                         .ConfigurationNumber    = 1,
 114                         .ConfigurationStrIndex  = NO_DESCRIPTOR,
 115
 116                         .ConfigAttributes       = (USB_CONFIG_ATTR_RESERVED | USB_CONFIG_ATTR_SELFPOWERED),
 117
 118                         .MaxPowerConsumption    = USB_CONFIG_POWER_MA(100)
 119                 },
 120
 121         .HID_Interface =
 122                 {
 123                         .Header                 = {.Size = sizeof(USB_Descriptor_Interface_t), .Type = DTYPE_Interface},
 124
 125                         .InterfaceNumber        = INTERFACE_ID_HID,
 126                         .AlternateSetting       = 0x00,
 127
 128                         .TotalEndpoints         = 1,
 129
 130                         .Class                  = HID_CSCP_HIDClass,
 131                         .SubClass               = HID_CSCP_NonBootSubclass,
 132                         .Protocol               = HID_CSCP_NonBootProtocol,
 133
 134                         .InterfaceStrIndex      = NO_DESCRIPTOR
 135                 },
 136
 137         .HID_MediaControlHID =
 138                 {
 139                         .Header                 = {.Size = sizeof(USB_HID_Descriptor_HID_t), .Type = HID_DTYPE_HID},
 140
 141                         .HIDSpec                = VERSION_BCD(1,1,1),
 142                         .CountryCode            = 0x00,
 143                         .TotalReportDescriptors = 1,
 144                         .HIDReportType          = HID_DTYPE_Report,
 145                         .HIDReportLength        = sizeof(MediaControlReport)
 146                 },
 147
 148         .HID_ReportINEndpoint =
 149                 {
 150                         .Header                 = {.Size = sizeof(USB_Descriptor_Endpoint_t), .Type = DTYPE_Endpoint},
 151
 152                         .EndpointAddress        = MEDIACONTROL_HID_EPADDR,
 153                         .Attributes             = (EP_TYPE_INTERRUPT | ENDPOINT_ATTR_NO_SYNC | ENDPOINT_USAGE_DATA),
 154                         .EndpointSize           = MEDIACONTROL_HID_EPSIZE,
 155                         .PollingIntervalMS      = 0x05
 156                 },
 157 };
 158
 159 /** Language descriptor structure. This descriptor, located in FLASH memory, is returned when the host requests
 160  *  the string descriptor with index 0 (the first index). It is actually an array of 16-bit integers, which indicate
 161  *  via the language ID table available at USB.org what languages the device supports for its string descriptors.
 162  */
 163 const USB_Descriptor_String_t PROGMEM LanguageString = USB_STRING_DESCRIPTOR_ARRAY(LANGUAGE_ID_ENG);
 164
 165 /** Manufacturer descriptor string. This is a Unicode string containing the manufacturer's details in human readable
 166  *  form, and is read out upon request by the host when the appropriate string ID is requested, listed in the Device
 167  *  Descriptor.
 168  */
 169 const USB_Descriptor_String_t PROGMEM ManufacturerString = USB_STRING_DESCRIPTOR(L"Dean Camera");
 170
 171 /** Product descriptor string. This is a Unicode string containing the product's details in human readable form,
 172  *  and is read out upon request by the host when the appropriate string ID is requested, listed in the Device
 173  *  Descriptor.
 174  */
 175 const USB_Descriptor_String_t PROGMEM ProductString = USB_STRING_DESCRIPTOR(L"LUFA Media Controller");
 176
 177 /** This function is called by the library when in device mode, and must be overridden (see library "USB Descriptors"
 178  *  documentation) by the application code so that the address and size of a requested descriptor can be given
 179  *  to the USB library. When the device receives a Get Descriptor request on the control endpoint, this function
 180  *  is called so that the descriptor details can be passed back and the appropriate descriptor sent back to the
 181  *  USB host.
 182  */
 183 uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 184                                     const uint8_t wIndex,
 185                                     const void** const DescriptorAddress)
 186 {
 187         const uint8_t  DescriptorType   = (wValue >> 8);
 188         const uint8_t  DescriptorNumber = (wValue & 0xFF);
 189
 190         const void* Address = NULL;
 191         uint16_t    Size    = NO_DESCRIPTOR;
 192
 193         switch (DescriptorType)
 194         {
 195                 case DTYPE_Device:
 196                         Address = &DeviceDescriptor;
 197                         Size    = sizeof(USB_Descriptor_Device_t);
 198                         break;
 199                 case DTYPE_Configuration:
 200                         Address = &ConfigurationDescriptor;
 201                         Size    = sizeof(USB_Descriptor_Configuration_t);
 202                         break;
 203                 case DTYPE_String:
 204                         switch (DescriptorNumber)
 205                         {
 206                                 case STRING_ID_Language:
 207                                         Address = &LanguageString;
 208                                         Size    = pgm_read_byte(&LanguageString.Header.Size);
 209                                         break;
 210                                 case STRING_ID_Manufacturer:
 211                                         Address = &ManufacturerString;
 212                                         Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 213                                         break;
 214                                 case STRING_ID_Product:
 215                                         Address = &ProductString;
 216                                         Size    = pgm_read_byte(&ProductString.Header.Size);
 217                                         break;
 218                         }
 219
 220                         break;
 221                 case HID_DTYPE_HID:
 222                         Address = &ConfigurationDescriptor.HID_MediaControlHID;
 223                         Size    = sizeof(USB_HID_Descriptor_HID_t);
 224                         break;
 225                 case HID_DTYPE_Report:
 226                         Address = &MediaControlReport;
 227                         Size    = sizeof(MediaControlReport);
 228                         break;
 229         }
 230
 231         *DescriptorAddress = Address;
 232         return Size;
 233 }
 234