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/*
 * 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 <linuxcomp.h>

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/tty.h>
#include <linux/module.h>
#include <linux/usb.h>

#ifdef CONFIG_USB_SERIAL_DEBUG
        static int debug = 1;
#else
        static int debug;
#endif

#include "usb-serial.h"

static int usb_serial_device_match (struct device *dev, struct device_driver *drv)
{
        struct usb_serial_device_type *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;
}

struct bus_type usb_serial_bus_type = {
        .name =         "usb-serial",
        .match =        usb_serial_device_match,
};

static int usb_serial_device_probe (struct device *dev)
{
        struct usb_serial_device_type *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->owner)) {
                        dev_err(dev, "module get failed, exiting\n");
                        retval = -EIO;
                        goto exit;
                }
                retval = driver->port_probe (port);
                module_put(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 (or usb/tts/%d for devfs)\n",
                 driver->name, minor, minor);

exit:
        return retval;
}

static int usb_serial_device_remove (struct device *dev)
{
        struct usb_serial_device_type *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->owner)) {
                        dev_err(dev, "module get failed, exiting\n");
                        retval = -EIO;
                        goto exit;
                }
                retval = driver->port_remove (port);
                module_put(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->name, minor);

        return retval;
}

int usb_serial_bus_register(struct usb_serial_device_type *device)
{
        int retval;

        if (device->short_name)
                device->driver.name = (char *)device->short_name;
        else
                device->driver.name = (char *)device->name;
        device->driver.bus = &usb_serial_bus_type;
        device->driver.probe = usb_serial_device_probe;
        device->driver.remove = usb_serial_device_remove;

        retval = driver_register(&device->driver);

        return retval;
}

void usb_serial_bus_deregister(struct usb_serial_device_type *device)
{
        driver_unregister (&device->driver);
}