--- /dev/null
+/*\r
+ LUFA Library\r
+ Copyright (C) Dean Camera, 2011.\r
+\r
+ dean [at] fourwalledcubicle [dot] com\r
+ www.lufa-lib.org\r
+*/\r
+\r
+/*\r
+ Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com)\r
+\r
+ Permission to use, copy, modify, distribute, and sell this\r
+ software and its documentation for any purpose is hereby granted\r
+ without fee, provided that the above copyright notice appear in\r
+ all copies and that both that the copyright notice and this\r
+ permission notice and warranty disclaimer appear in supporting\r
+ documentation, and that the name of the author not be used in\r
+ advertising or publicity pertaining to distribution of the\r
+ software without specific, written prior permission.\r
+\r
+ The author disclaim all warranties with regard to this\r
+ software, including all implied warranties of merchantability\r
+ and fitness. In no event shall the author be liable for any\r
+ special, indirect or consequential damages or any damages\r
+ whatsoever resulting from loss of use, data or profits, whether\r
+ in an action of contract, negligence or other tortious action,\r
+ arising out of or in connection with the use or performance of\r
+ this software.\r
+*/\r
+\r
+/** \file\r
+ *\r
+ * USB Device Configuration Descriptor processing routines, to determine the correct pipe configurations\r
+ * needed to communication with an attached USB device. Descriptors are special computer-readable structures\r
+ * which the host requests upon device enumeration, to determine the device's capabilities and functions.\r
+ */\r
+\r
+#include "ConfigDescriptor.h"\r
+\r
+/** Reads and processes an attached device's descriptors, to determine compatibility and pipe configurations. This\r
+ * routine will read in the entire configuration descriptor, and configure the hosts pipes to correctly communicate\r
+ * with compatible devices.\r
+ *\r
+ * This routine searches for the first interface containing bulk IN and OUT data endpoints.\r
+ *\r
+ * \return An error code from the \ref AndroidHost_GetConfigDescriptorDataCodes_t enum.\r
+ */\r
+uint8_t ProcessConfigurationDescriptor(void)\r
+{\r
+ uint8_t ConfigDescriptorData[512];\r
+ void* CurrConfigLocation = ConfigDescriptorData;\r
+ uint16_t CurrConfigBytesRem;\r
+\r
+ USB_Descriptor_Endpoint_t* DataINEndpoint = NULL;\r
+ USB_Descriptor_Endpoint_t* DataOUTEndpoint = NULL;\r
+\r
+ /* Retrieve the entire configuration descriptor into the allocated buffer */\r
+ switch (USB_Host_GetDeviceConfigDescriptor(1, &CurrConfigBytesRem, ConfigDescriptorData, sizeof(ConfigDescriptorData)))\r
+ {\r
+ case HOST_GETCONFIG_Successful:\r
+ break;\r
+ case HOST_GETCONFIG_InvalidData:\r
+ return InvalidConfigDataReturned;\r
+ case HOST_GETCONFIG_BuffOverflow:\r
+ return DescriptorTooLarge;\r
+ default:\r
+ return DevControlError;\r
+ }\r
+\r
+ /* The Android Accessory Mode specification mandates that the accessory communications endpoints\r
+ be in the first interface descriptor (interface 0) */\r
+ USB_GetNextDescriptorOfType(&CurrConfigBytesRem, &CurrConfigLocation, DTYPE_Interface);\r
+\r
+ /* Ensure that an interface was found, and the end of the descriptor was not reached */\r
+ if (!(CurrConfigBytesRem))\r
+ return NoCompatibleInterfaceFound;\r
+\r
+ while (!(DataINEndpoint) || !(DataOUTEndpoint))\r
+ {\r
+ /* Get the next Still Image interface's data endpoint descriptor */\r
+ if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,\r
+ DCOMP_NextInterfaceBulkEndpoint) != DESCRIPTOR_SEARCH_COMP_Found)\r
+ {\r
+ /* Data endpoints not found within the first Android Accessory device interface, error out */\r
+ return NoCompatibleInterfaceFound;\r
+ }\r
+\r
+ /* Retrieve the endpoint address from the endpoint descriptor */\r
+ USB_Descriptor_Endpoint_t* EndpointData = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Endpoint_t);\r
+\r
+ /* If the endpoint is a IN type endpoint */\r
+ if (EndpointData->EndpointAddress & ENDPOINT_DESCRIPTOR_DIR_IN)\r
+ DataINEndpoint = EndpointData;\r
+ else\r
+ DataOUTEndpoint = EndpointData;\r
+ }\r
+\r
+ /* Configure the Android Accessory data IN pipe */\r
+ Pipe_ConfigurePipe(ANDROID_DATA_IN_PIPE, EP_TYPE_BULK, PIPE_TOKEN_IN,\r
+ DataINEndpoint->EndpointAddress, DataINEndpoint->EndpointSize, PIPE_BANK_SINGLE);\r
+\r
+ /* Configure the Android Accessory data OUT pipe */\r
+ Pipe_ConfigurePipe(ANDROID_DATA_OUT_PIPE, EP_TYPE_BULK, PIPE_TOKEN_OUT,\r
+ DataOUTEndpoint->EndpointAddress, DataOUTEndpoint->EndpointSize, PIPE_BANK_SINGLE);\r
+\r
+ /* Valid data found, return success */\r
+ return SuccessfulConfigRead;\r
+}\r
+\r
+/** Descriptor comparator function. This comparator function is can be called while processing an attached USB device's\r
+ * configuration descriptor, to search for a specific sub descriptor. It can also be used to abort the configuration\r
+ * descriptor processing if an incompatible descriptor configuration is found.\r
+ *\r
+ * This comparator searches for the next Endpoint descriptor inside the current interface descriptor, aborting the\r
+ * search if another interface descriptor is found before the required endpoint.\r
+ *\r
+ * \return A value from the DSEARCH_Return_ErrorCodes_t enum\r
+ */\r
+uint8_t DCOMP_NextInterfaceBulkEndpoint(void* const CurrentDescriptor)\r
+{\r
+ USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t);\r
+\r
+ if (Header->Type == DTYPE_Endpoint)\r
+ {\r
+ USB_Descriptor_Endpoint_t* Endpoint = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Endpoint_t);\r
+\r
+ uint8_t EndpointType = (Endpoint->Attributes & EP_TYPE_MASK);\r
+ if ((EndpointType == EP_TYPE_BULK) && (!(Pipe_IsEndpointBound(Endpoint->EndpointAddress))))\r
+ return DESCRIPTOR_SEARCH_Found;\r
+ }\r
+ else if (Header->Type == DTYPE_Interface)\r
+ {\r
+ return DESCRIPTOR_SEARCH_Fail;\r
+ }\r
+\r
+ return DESCRIPTOR_SEARCH_NotFound;\r
+}\r
+\r
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