LXR linux/drivers/usb/serial/empeg.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * USB Empeg empeg-car player driver
   4 *
   5 *      Copyright (C) 2000, 2001
   6 *          Gary Brubaker (xavyer@ix.netcom.com)
   7 *
   8 *      Copyright (C) 1999 - 2001
   9 *          Greg Kroah-Hartman (greg@kroah.com)
  10 *
  11 * See Documentation/usb/usb-serial.txt for more information on using this
  12 * driver
  13 */
  14
  15#include <linux/kernel.h>
  16#include <linux/errno.h>
  17#include <linux/slab.h>
  18#include <linux/tty.h>
  19#include <linux/tty_driver.h>
  20#include <linux/tty_flip.h>
  21#include <linux/module.h>
  22#include <linux/spinlock.h>
  23#include <linux/uaccess.h>
  24#include <linux/usb.h>
  25#include <linux/usb/serial.h>
  26
  27#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Gary Brubaker <xavyer@ix.netcom.com>"
  28#define DRIVER_DESC "USB Empeg Mark I/II Driver"
  29
  30#define EMPEG_VENDOR_ID                 0x084f
  31#define EMPEG_PRODUCT_ID                0x0001
  32
  33/* function prototypes for an empeg-car player */
  34static int  empeg_startup(struct usb_serial *serial);
  35static void empeg_init_termios(struct tty_struct *tty);
  36
  37static const struct usb_device_id id_table[] = {
  38        { USB_DEVICE(EMPEG_VENDOR_ID, EMPEG_PRODUCT_ID) },
  39        { }                                     /* Terminating entry */
  40};
  41
  42MODULE_DEVICE_TABLE(usb, id_table);
  43
  44static struct usb_serial_driver empeg_device = {
  45        .driver = {
  46                .owner =        THIS_MODULE,
  47                .name =         "empeg",
  48        },
  49        .id_table =             id_table,
  50        .num_ports =            1,
  51        .bulk_out_size =        256,
  52        .throttle =             usb_serial_generic_throttle,
  53        .unthrottle =           usb_serial_generic_unthrottle,
  54        .attach =               empeg_startup,
  55        .init_termios =         empeg_init_termios,
  56};
  57
  58static struct usb_serial_driver * const serial_drivers[] = {
  59        &empeg_device, NULL
  60};
  61
  62static int empeg_startup(struct usb_serial *serial)
  63{
  64        int r;
  65
  66        if (serial->dev->actconfig->desc.bConfigurationValue != 1) {
  67                dev_err(&serial->dev->dev, "active config #%d != 1 ??\n",
  68                        serial->dev->actconfig->desc.bConfigurationValue);
  69                return -ENODEV;
  70        }
  71
  72        r = usb_reset_configuration(serial->dev);
  73
  74        /* continue on with initialization */
  75        return r;
  76}
  77
  78static void empeg_init_termios(struct tty_struct *tty)
  79{
  80        struct ktermios *termios = &tty->termios;
  81
  82        /*
  83         * The empeg-car player wants these particular tty settings.
  84         * You could, for example, change the baud rate, however the
  85         * player only supports 115200 (currently), so there is really
  86         * no point in support for changes to the tty settings.
  87         * (at least for now)
  88         *
  89         * The default requirements for this device are:
  90         */
  91        termios->c_iflag
  92                &= ~(IGNBRK     /* disable ignore break */
  93                | BRKINT        /* disable break causes interrupt */
  94                | PARMRK        /* disable mark parity errors */
  95                | ISTRIP        /* disable clear high bit of input characters */
  96                | INLCR         /* disable translate NL to CR */
  97                | IGNCR         /* disable ignore CR */
  98                | ICRNL         /* disable translate CR to NL */
  99                | IXON);        /* disable enable XON/XOFF flow control */
 100
 101        termios->c_oflag
 102                &= ~OPOST;      /* disable postprocess output characters */
 103
 104        termios->c_lflag
 105                &= ~(ECHO       /* disable echo input characters */
 106                | ECHONL        /* disable echo new line */
 107                | ICANON        /* disable erase, kill, werase, and rprnt special characters */
 108                | ISIG          /* disable interrupt, quit, and suspend special characters */
 109                | IEXTEN);      /* disable non-POSIX special characters */
 110
 111        termios->c_cflag
 112                &= ~(CSIZE      /* no size */
 113                | PARENB        /* disable parity bit */
 114                | CBAUD);       /* clear current baud rate */
 115
 116        termios->c_cflag
 117                |= CS8;         /* character size 8 bits */
 118
 119        tty_encode_baud_rate(tty, 115200, 115200);
 120}
 121
 122module_usb_serial_driver(serial_drivers, id_table);
 123
 124MODULE_AUTHOR(DRIVER_AUTHOR);
 125MODULE_DESCRIPTION(DRIVER_DESC);
 126MODULE_LICENSE("GPL v2");
 127