/* * linux/drivers/usbd/usb-bus.c - basic bus interface support * * Copyright (c) 2000, 2001, 2002 Lineo * Copyright (c) 2001 Hewlett Packard * * By:  *      Stuart Lynne <sl@lineo.com>,  *      Tom Rushworth <tbr@lineo.com>,  *      Bruce Balden <balden@lineo.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * *//* * USB Bus Interface Driver structures * * Driver description: *  *  struct usb_bus_operations *  struct usb_bus_driver * */struct usb_device_description;/* Operations that the slave layer or function driver can use to interact * with the bus interface driver.  * * The send_urb() function is used by the usb-device endpoint 0 driver and * function drivers to submit data to be sent. * * The cancel_urb() function is used by the usb-device endpoint 0 driver and * function drivers to remove previously queued data to be sent. * * The endpoint_halted() function is used by the ep0 control function to * check if an endpoint is halted. * * The device_feature() function is used by the ep0 control function to * set/reset device features on an endpoint. * * The device_event() function is used by the usb device core to tell the * bus interface driver about various events. */struct usb_bus_operations {	int (*send_urb) (struct urb *);	int (*cancel_urb) (struct urb *);	int (*endpoint_halted) (struct usb_device_instance *, int);	int (*device_feature) (struct usb_device_instance *, int, int);	int (*device_event) (struct usb_device_instance *, usb_device_event_t, int);};/* Bus Interface data structure * * Keep track of specific bus interface.  * * This is passed to the usb-device layer when registering. It contains all * required information about each real bus interface found such that the * usb-device layer can create and maintain a usb-device structure. * * Note that bus interface registration is incumbent on finding specific * actual real bus interfaces. There will be a registration for each such * device found. * * The max_tx_endpoints and max_rx_endpoints are the maximum number of * possible endpoints that this bus interface can support. The default * endpoint 0 is not included in these counts. * */struct usb_bus_driver {	char				*name;	unsigned char			max_endpoints;	// maximimum number of rx enpoints	unsigned char			maxpacketsize;	struct usb_device_description	*device_description;	struct usb_bus_operations	*ops;	struct module			*this_module;	// manage inc use counts to prevent unload races};