// SPDX-License-Identifier: GPL-2.0
/*
 * USB Empeg empeg-car player driver
 *
 *      Copyright (C) 2000, 2001
 *          Gary Brubaker (xavyer@ix.netcom.com)
 *
 *      Copyright (C) 1999 - 2001
 *          Greg Kroah-Hartman (greg@kroah.com)
 *
 * See Documentation/usb/usb-serial.rst for more information on using this
 * driver
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>

#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Gary Brubaker <xavyer@ix.netcom.com>"
#define DRIVER_DESC "USB Empeg Mark I/II Driver"

#define EMPEG_VENDOR_ID                 0x084f
#define EMPEG_PRODUCT_ID                0x0001

/* function prototypes for an empeg-car player */
static int  empeg_startup(struct usb_serial *serial);
static void empeg_init_termios(struct tty_struct *tty);

static const struct usb_device_id id_table[] = {
        { USB_DEVICE(EMPEG_VENDOR_ID, EMPEG_PRODUCT_ID) },
        { }                                     /* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, id_table);

static struct usb_serial_driver empeg_device = {
        .driver = {
                .name =         "empeg",
        },
        .id_table =             id_table,
        .num_ports =            1,
        .bulk_out_size =        256,
        .throttle =             usb_serial_generic_throttle,
        .unthrottle =           usb_serial_generic_unthrottle,
        .attach =               empeg_startup,
        .init_termios =         empeg_init_termios,
};

static struct usb_serial_driver * const serial_drivers[] = {
        &empeg_device, NULL
};

static int empeg_startup(struct usb_serial *serial)
{
        int r;

        if (serial->dev->actconfig->desc.bConfigurationValue != 1) {
                dev_err(&serial->dev->dev, "active config #%d != 1 ??\n",
                        serial->dev->actconfig->desc.bConfigurationValue);
                return -ENODEV;
        }

        r = usb_reset_configuration(serial->dev);

        /* continue on with initialization */
        return r;
}

static void empeg_init_termios(struct tty_struct *tty)
{
        struct ktermios *termios = &tty->termios;

        /*
         * The empeg-car player wants these particular tty settings.
         * You could, for example, change the baud rate, however the
         * player only supports 115200 (currently), so there is really
         * no point in support for changes to the tty settings.
         * (at least for now)
         *
         * The default requirements for this device are:
         */
        termios->c_iflag
                &= ~(IGNBRK     /* disable ignore break */
                | BRKINT        /* disable break causes interrupt */
                | PARMRK        /* disable mark parity errors */
                | ISTRIP        /* disable clear high bit of input characters */
                | INLCR         /* disable translate NL to CR */
                | IGNCR         /* disable ignore CR */
                | ICRNL         /* disable translate CR to NL */
                | IXON);        /* disable enable XON/XOFF flow control */

        termios->c_oflag
                &= ~OPOST;      /* disable postprocess output characters */

        termios->c_lflag
                &= ~(ECHO       /* disable echo input characters */
                | ECHONL        /* disable echo new line */
                | ICANON        /* disable erase, kill, werase, and rprnt special characters */
                | ISIG          /* disable interrupt, quit, and suspend special characters */
                | IEXTEN);      /* disable non-POSIX special characters */

        termios->c_cflag
                &= ~(CSIZE      /* no size */
                | PARENB        /* disable parity bit */
                | CBAUD);       /* clear current baud rate */

        termios->c_cflag
                |= CS8;         /* character size 8 bits */

        tty_encode_baud_rate(tty, 115200, 115200);
}

module_usb_serial_driver(serial_drivers, id_table);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL v2");