empeg.c

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/*
 * USB Empeg empeg-car player driver
 *
 *  Copyright (C) 2000, 2001
 *      Gary Brubaker ([email protected])
 *
 *  Copyright (C) 1999 - 2001
 *      Greg Kroah-Hartman ([email protected])
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License, as published by
 *  the Free Software Foundation, version 2.
 *
 * See Documentation/usb/usb-serial.txt for more information on using this
 * driver
 */

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

/*
 * Version Information
 */
#define DRIVER_VERSION "v1.3"
#define DRIVER_AUTHOR "Greg Kroah-Hartman <[email protected]>, Gary Brubaker <[email protected]>"
#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 = {
        .owner =    THIS_MODULE,
        .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");