/* * USB Serial Converter Bus specific functions * * Copyright (C) 2002 Greg Kroah-Hartman (greg@kroah.com) * *	This program is free software; you can redistribute it and/or *	modify it under the terms of the GNU General Public License version *	2 as published by the Free Software Foundation. */#include <linux/kernel.h>#include <linux/errno.h>#include <linux/tty.h>#include <linux/module.h>#include <linux/usb.h>#include <linux/usb/serial.h>static int usb_serial_device_match (struct device *dev, struct device_driver *drv){	struct usb_serial_driver *driver;	const struct usb_serial_port *port;	/*	 * drivers are already assigned to ports in serial_probe so it's	 * a simple check here.	 */	port = to_usb_serial_port(dev);	if (!port)		return 0;	driver = to_usb_serial_driver(drv);	if (driver == port->serial->type)		return 1;	return 0;}static ssize_t show_port_number(struct device *dev,				struct device_attribute *attr, char *buf){	struct usb_serial_port *port = to_usb_serial_port(dev);	return sprintf(buf, "%d\n", port->number - port->serial->minor);}static DEVICE_ATTR(port_number, S_IRUGO, show_port_number, NULL);static int usb_serial_device_probe (struct device *dev){	struct usb_serial_driver *driver;	struct usb_serial_port *port;	int retval = 0;	int minor;	port = to_usb_serial_port(dev);	if (!port) {		retval = -ENODEV;		goto exit;	}	driver = port->serial->type;	if (driver->port_probe) {		if (!try_module_get(driver->driver.owner)) {			dev_err(dev, "module get failed, exiting\n");			retval = -EIO;			goto exit;		}		retval = driver->port_probe (port);		module_put(driver->driver.owner);		if (retval)			goto exit;	}	retval = device_create_file(dev, &dev_attr_port_number);	if (retval)		goto exit;	minor = port->number;	tty_register_device (usb_serial_tty_driver, minor, dev);	dev_info(&port->serial->dev->dev, 		 "%s converter now attached to ttyUSB%d\n",		 driver->description, minor);exit:	return retval;}static int usb_serial_device_remove (struct device *dev){	struct usb_serial_driver *driver;	struct usb_serial_port *port;	int retval = 0;	int minor;	port = to_usb_serial_port(dev);	if (!port) {		return -ENODEV;	}	device_remove_file(&port->dev, &dev_attr_port_number);	driver = port->serial->type;	if (driver->port_remove) {		if (!try_module_get(driver->driver.owner)) {			dev_err(dev, "module get failed, exiting\n");			retval = -EIO;			goto exit;		}		retval = driver->port_remove (port);		module_put(driver->driver.owner);	}exit:	minor = port->number;	tty_unregister_device (usb_serial_tty_driver, minor);	dev_info(dev, "%s converter now disconnected from ttyUSB%d\n",		 driver->description, minor);	return retval;}#ifdef CONFIG_HOTPLUGstatic ssize_t store_new_id(struct device_driver *driver,			    const char *buf, size_t count){	struct usb_serial_driver *usb_drv = to_usb_serial_driver(driver);	ssize_t retval = usb_store_new_id(&usb_drv->dynids, driver, buf, count);	if (retval >= 0 && usb_drv->usb_driver != NULL)		retval = usb_store_new_id(&usb_drv->usb_driver->dynids,					  &usb_drv->usb_driver->drvwrap.driver,					  buf, count);	return retval;}static struct driver_attribute drv_attrs[] = {	__ATTR(new_id, S_IWUSR, NULL, store_new_id),	__ATTR_NULL,};static void free_dynids(struct usb_serial_driver *drv){	struct usb_dynid *dynid, *n;	spin_lock(&drv->dynids.lock);	list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {		list_del(&dynid->node);		kfree(dynid);	}	spin_unlock(&drv->dynids.lock);}#elsestatic struct driver_attribute drv_attrs[] = {	__ATTR_NULL,};static inline void free_dynids(struct usb_serial_driver *drv){}#endifstruct bus_type usb_serial_bus_type = {	.name =		"usb-serial",	.match =	usb_serial_device_match,	.probe =	usb_serial_device_probe,	.remove =	usb_serial_device_remove,	.drv_attrs = 	drv_attrs,};int usb_serial_bus_register(struct usb_serial_driver *driver){	int retval;	driver->driver.bus = &usb_serial_bus_type;	spin_lock_init(&driver->dynids.lock);	INIT_LIST_HEAD(&driver->dynids.list);	retval = driver_register(&driver->driver);	return retval;}void usb_serial_bus_deregister(struct usb_serial_driver *driver){	free_dynids(driver);	driver_unregister(&driver->driver);}