linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * USB Serial Converter Bus specific functions

 *

 * Copyright (C) 2002 Greg Kroah-Hartman (greg@kroah.com)

 */

​

#include <linux/kernel.h>

#include <linux/errno.h>

#include <linux/tty.h>

#include <linux/slab.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;

    struct device *tty_dev;

    int retval = 0;

    int minor;

​

    port = to_usb_serial_port(dev);

    if (!port)

        return -ENODEV;

​

    /* make sure suspend/resume doesn't race against port_probe */

    retval = usb_autopm_get_interface(port->serial->interface);

    if (retval)

        return retval;

​

    driver = port->serial->type;

    if (driver->port_probe) {

        retval = driver->port_probe(port);

        if (retval)

            goto err_autopm_put;

    }

​

    minor = port->minor;

    tty_dev = tty_port_register_device(&port->port, usb_serial_tty_driver,

                       minor, dev);

    if (IS_ERR(tty_dev)) {

        retval = PTR_ERR(tty_dev);

        goto err_port_remove;

    }

​

    usb_autopm_put_interface(port->serial->interface);

​

    dev_info(&port->serial->dev->dev,

         "%s converter now attached to ttyUSB%d\n",

         driver->description, minor);

​

    return 0;

​

err_port_remove:

    if (driver->port_remove)

        driver->port_remove(port);

err_autopm_put:

    usb_autopm_put_interface(port->serial->interface);

​

    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;