From 60b30c036397cb5627fa374bb930794b225daa29 Mon Sep 17 00:00:00 2001
From: Jack Humbert <jack.humb@gmail.com>
Date: Fri, 7 Jul 2017 11:55:23 -0400
Subject: Squashed 'lib/lufa/' content from commit 385d40300
git-subtree-dir: lib/lufa
git-subtree-split: 385d4030035dbaf41591309dbde47653bd03841b
---
.../LowLevel/VirtualSerialHost/ConfigDescriptor.c | 234 +++++++++++++++++++++
1 file changed, 234 insertions(+)
create mode 100644 Demos/Host/LowLevel/VirtualSerialHost/ConfigDescriptor.c
(limited to 'Demos/Host/LowLevel/VirtualSerialHost/ConfigDescriptor.c')
diff --git a/Demos/Host/LowLevel/VirtualSerialHost/ConfigDescriptor.c b/Demos/Host/LowLevel/VirtualSerialHost/ConfigDescriptor.c
new file mode 100644
index 0000000000..fa5312ffe2
--- /dev/null
+++ b/Demos/Host/LowLevel/VirtualSerialHost/ConfigDescriptor.c
@@ -0,0 +1,234 @@
+/*
+ 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"
+
+/** 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 CDC interface descriptor containing bulk data IN and OUT endpoints, and an interrupt event endpoint.
+ *
+ * \return An error code from the \ref CDCHost_GetConfigDescriptorDataCodes_t enum.
+ */
+uint8_t ProcessConfigurationDescriptor(void)
+{
+ uint8_t ConfigDescriptorData[512];
+ void* CurrConfigLocation = ConfigDescriptorData;
+ uint16_t CurrConfigBytesRem;
+
+ USB_Descriptor_Interface_t* CDCControlInterface = NULL;
+ USB_Descriptor_Endpoint_t* DataINEndpoint = NULL;
+ USB_Descriptor_Endpoint_t* DataOUTEndpoint = NULL;
+ USB_Descriptor_Endpoint_t* NotificationEndpoint = 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) || !(DataOUTEndpoint) || !(NotificationEndpoint))
+ {
+ /* See if we've found a likely compatible interface, and if there is an endpoint within that interface */
+ if (!(CDCControlInterface) ||
+ USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
+ DComp_NextCDCDataInterfaceEndpoint) != DESCRIPTOR_SEARCH_COMP_Found)
+ {
+ /* Check if we have already found the control interface's notification endpoint or not */
+ if (NotificationEndpoint)
+ {
+ /* Get the next CDC data interface from the configuration descriptor */
+ if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
+ DComp_NextCDCDataInterface) != DESCRIPTOR_SEARCH_COMP_Found)
+ {
+ /* Descriptor not found, error out */
+ return NoCompatibleInterfaceFound;
+ }
+
+ /* Clear any found endpoints */
+ DataINEndpoint = NULL;
+ DataOUTEndpoint = NULL;
+ }
+ else
+ {
+ /* Get the next CDC control interface from the configuration descriptor */
+ if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
+ DComp_NextCDCControlInterface) != DESCRIPTOR_SEARCH_COMP_Found)
+ {
+ /* Descriptor not found, error out */
+ return NoCompatibleInterfaceFound;
+ }
+
+ /* Save the interface in case we need to refer back to it later */
+ CDCControlInterface = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Interface_t);
+
+ /* Clear any found endpoints */
+ NotificationEndpoint = NULL;
+ }
+
+ /* 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);
+
+ /* If the endpoint is a IN type endpoint */
+ if ((EndpointData->EndpointAddress & ENDPOINT_DIR_MASK) == ENDPOINT_DIR_IN)
+ {
+ /* Check if the found endpoint is a interrupt or bulk type descriptor */
+ if ((EndpointData->Attributes & EP_TYPE_MASK) == EP_TYPE_INTERRUPT)
+ NotificationEndpoint = EndpointData;
+ else
+ DataINEndpoint = EndpointData;
+ }
+ else
+ {
+ DataOUTEndpoint = EndpointData;
+ }
+ }
+
+ /* Configure the CDC data IN pipe */
+ Pipe_ConfigurePipe(CDC_DATA_IN_PIPE, EP_TYPE_BULK, DataINEndpoint->EndpointAddress, DataINEndpoint->EndpointSize, 1);
+
+ /* Configure the CDC data OUT pipe */
+ Pipe_ConfigurePipe(CDC_DATA_OUT_PIPE, EP_TYPE_BULK, DataOUTEndpoint->EndpointAddress, DataOUTEndpoint->EndpointSize, 1);
+
+ /* Configure the CDC notification pipe */
+ Pipe_ConfigurePipe(CDC_NOTIFICATION_PIPE, EP_TYPE_INTERRUPT, NotificationEndpoint->EndpointAddress, NotificationEndpoint->EndpointSize, 1);
+ Pipe_SetInterruptPeriod(NotificationEndpoint->PollingIntervalMS);
+
+ /* 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 CDC control Class, Subclass and Protocol values.
+ *
+ * \return A value from the DSEARCH_Return_ErrorCodes_t enum
+ */
+uint8_t DComp_NextCDCControlInterface(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);
+
+ /* Check the CDC descriptor class, subclass and protocol, break out if correct control interface found */
+ if ((Interface->Class == CDC_CSCP_CDCClass) &&
+ (Interface->SubClass == CDC_CSCP_ACMSubclass) &&
+ (Interface->Protocol == CDC_CSCP_ATCommandProtocol))
+ {
+ 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 CDC data Class, Subclass and Protocol values.
+ *
+ * \return A value from the DSEARCH_Return_ErrorCodes_t enum
+ */
+uint8_t DComp_NextCDCDataInterface(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);
+
+ /* Check the CDC descriptor class, subclass and protocol, break out if correct data interface found */
+ if ((Interface->Class == CDC_CSCP_CDCDataClass) &&
+ (Interface->SubClass == CDC_CSCP_NoDataSubclass) &&
+ (Interface->Protocol == CDC_CSCP_NoDataProtocol))
+ {
+ 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 bulk IN or OUT endpoint, or interrupt IN endpoint within the current interface,
+ * aborting the search if another interface descriptor is found before the required endpoint (so that it may be compared
+ * using a different comparator to determine if it is another CDC class interface).
+ *
+ * \return A value from the DSEARCH_Return_ErrorCodes_t enum
+ */
+uint8_t DComp_NextCDCDataInterfaceEndpoint(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_BULK) ||
+ ((Endpoint->Attributes & EP_TYPE_MASK) == EP_TYPE_INTERRUPT))
+ {
+ return DESCRIPTOR_SEARCH_Found;
+ }
+ }
+ else if (Header->Type == DTYPE_Interface)
+ {
+ return DESCRIPTOR_SEARCH_Fail;
+ }
+
+ return DESCRIPTOR_SEARCH_NotFound;
+}
+
--
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