drivers/usb/serial/empeg.c

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