/* * 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 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; } 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; } 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; } struct bus_type usb_serial_bus_type = { .name = "usb-serial", .match = usb_serial_device_match, .probe = usb_serial_device_probe, .remove = usb_serial_device_remove, }; int usb_serial_bus_register(struct usb_serial_driver *driver) { int retval; driver->driver.bus = &usb_serial_bus_type; retval = driver_register(&driver->driver); return retval; } void usb_serial_bus_deregister(struct usb_serial_driver *driver) { driver_unregister(&driver->driver); }