* Add a AlternateAt() method to the BUSBInterface class that can retrieve the

usb_interface_descriptor of an alternate interface without having to switch
  to it.
* Add some reserve bytes to all classes and add some reserved virtual slots
  where the objects are publically constructable.
* Remove the source compatibilty defines that were briding the old USB* with
  the new BUSB* class names.
* Implement the usb_raw side of getting an alternate interface descriptor.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24842 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/libs/usb/USBKit.h

@@ -11,14 +11,6 @@
 #include <USB_spec.h>
 
 
-// Keep compatibility with original USBKit classes
-#define USBRoster			BUSBRoster
-#define USBDevice			BUSBDevice
-#define USBConfiguration	BUSBConfiguration
-#define USBInterface		BUSBInterface
-#define USBEndpoint			BUSBEndpoint
-
-
 class BUSBRoster;
 class BUSBDevice;
 class BUSBConfiguration;
@@ -54,7 +46,14 @@ virtual	void						DeviceRemoved(BUSBDevice *device) = 0;
 		void						Stop();
 
 private:
+virtual	void						_ReservedUSBRoster1();
+virtual	void						_ReservedUSBRoster2();
+virtual	void						_ReservedUSBRoster3();
+virtual	void						_ReservedUSBRoster4();
+virtual	void						_ReservedUSBRoster5();
+
 		void						*fLooper;
+		uint32						fReserved[10];
 };
 
 
@@ -138,6 +137,12 @@ virtual	status_t					InitCheck();
 										void *data) const;
 
 private:
+virtual	void						_ReservedUSBDevice1();
+virtual	void						_ReservedUSBDevice2();
+virtual	void						_ReservedUSBDevice3();
+virtual	void						_ReservedUSBDevice4();
+virtual	void						_ReservedUSBDevice5();
+
 		char						*fPath;
 		int							fRawFD;
 
@@ -148,6 +153,8 @@ private:
 mutable	char						*fManufacturerString;
 mutable	char						*fProductString;
 mutable	char						*fSerialNumberString;
+
+		uint32						fReserved[10];
 };
 
 
@@ -195,6 +202,8 @@ friend	class BUSBDevice;
 		BUSBInterface				**fInterfaces;
 
 mutable	char						*fConfigurationString;
+
+		uint32						fReserved[10];
 };
 
 
@@ -238,14 +247,26 @@ public:
 		const BUSBEndpoint			*EndpointAt(uint32 index) const;
 
 		// Using CountAlternates() you can retrieve the number of alternate
-		// interfaces at this interface index. Note that this interface itself
+		// interfaces for this interface. Note that this interface itself
 		// counts as an alternate so an alternate count of one really means
 		// that you are currently using the sole interface present.
+		// AlternateAt() returns the interface descriptor of the alternate
+		// interface with the specified index. Using that you can peek at the
+		// information contained in the descriptor without having to switch
+		// to this alternate interface. Note that the alternate index set in
+		// the interface descriptor returned is not necessarily the same index
+		// you used to get the descriptor. Always use the zero based index you
+		// used to get the information with and not the values of the returned
+		// descriptor as the stack will handle that translation internally.
+		// The interface descriptor returned was allocated by new and is yours.
+		// You need to delete it when you're done with it.
 		// With SetAlternate() you can switch this BUSBInterface object to the
-		// alternate at the specified index. Note that all endpoints retrieved
-		// through EndpointAt() will become invalid and be deleted as soon as
-		// you set an alternate.
+		// alternate interface at the specified index. Note that all endpoints
+		// retrieved through EndpointAt() will become invalid and will be
+		// deleted as soon as you set an alternate interface (even if the
+		// resulting interface is the same you were using before).
 		uint32						CountAlternates() const;
+		usb_interface_descriptor	*AlternateAt(uint32 alternateIndex);
 		status_t					SetAlternate(uint32 alternateIndex);
 
 private:
@@ -264,6 +285,8 @@ friend	class BUSBConfiguration;
 		BUSBEndpoint				**fEndpoints;
 
 mutable	char						*fInterfaceString;
+
+		uint32						fReserved[10];
 };
 
 
@@ -331,6 +354,8 @@ friend	class BUSBInterface;
 		int							fRawFD;
 
 		usb_endpoint_descriptor		fDescriptor;
+
+		uint32						fReserved[10];
 };
 
 #endif

src/add-ons/kernel/drivers/bus/usb/usb_raw.cpp

@@ -290,6 +290,34 @@ usb_raw_ioctl(void *cookie, uint32 op, void *buffer, size_t length)
 			return B_OK;
 		}
 
+		case RAW_COMMAND_GET_ALT_INTERFACE_DESCRIPTOR: {
+			const usb_configuration_info *configurationInfo =
+				gUSBModule->get_nth_configuration(device->device,
+				command->alternate.config_index);
+			if (!configurationInfo) {
+				command->alternate.status = RAW_STATUS_INVALID_CONFIGURATION;
+				return B_OK;
+			}
+
+			if (command->alternate.interface_index >= configurationInfo->interface_count) {
+				command->alternate.status = RAW_STATUS_INVALID_INTERFACE;
+				return B_OK;
+			}
+
+			const usb_interface_list *interfaceList =
+				&configurationInfo->interface[command->alternate.interface_index];
+			if (command->alternate.alternate_index >= interfaceList->alt_count) {
+				command->alternate.status = RAW_STATUS_INVALID_INTERFACE;
+				return B_OK;
+			}
+
+			memcpy(command->alternate.descriptor,
+				&interfaceList->alt[command->alternate.alternate_index],
+				sizeof(usb_interface_descriptor));
+			command->alternate.status = RAW_STATUS_SUCCESS;
+			return B_OK;
+		}
+
 		case RAW_COMMAND_GET_ENDPOINT_DESCRIPTOR: {
 			const usb_configuration_info *configurationInfo =
 				gUSBModule->get_nth_configuration(device->device,

src/add-ons/kernel/drivers/bus/usb/usb_raw.h

@@ -24,6 +24,7 @@ typedef enum {
 	RAW_COMMAND_GET_STRING_DESCRIPTOR,
 	RAW_COMMAND_GET_GENERIC_DESCRIPTOR,
 	RAW_COMMAND_GET_ALT_INTERFACE_COUNT,
+	RAW_COMMAND_GET_ALT_INTERFACE_DESCRIPTOR,
 
 	RAW_COMMAND_SET_CONFIGURATION = 0x3000,
 	RAW_COMMAND_SET_FEATURE,
@@ -83,6 +84,7 @@ typedef union {
 	struct {
 		status_t						status;
 		uint32							*alternate_count;
+		usb_interface_descriptor		*descriptor;
 		uint32							config_index;
 		uint32							interface_index;
 		uint32							alternate_index;

src/libs/usb/USBInterface.cpp

@@ -157,6 +157,28 @@ BUSBInterface::CountAlternates() const
 }
 
 
+usb_interface_descriptor *
+BUSBInterface::AlternateAt(uint32 alternateIndex)
+{
+	usb_interface_descriptor *descriptor = new usb_interface_descriptor;
+	if (descriptor == NULL)
+		return NULL;
+
+	raw_command command;
+	command.alternate.descriptor = descriptor;
+	command.alternate.config_index = fConfiguration->Index();
+	command.alternate.interface_index = fIndex;
+	command.alternate.alternate_index = alternateIndex;
+	if (ioctl(fRawFD, RAW_COMMAND_GET_ALT_INTERFACE_DESCRIPTOR, &command,
+		sizeof(command)) || command.alternate.status != RAW_STATUS_SUCCESS) {
+		delete descriptor;
+		return NULL;
+	}
+
+	return descriptor;
+}
+
+
 status_t
 BUSBInterface::SetAlternate(uint32 alternateIndex)
 {