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/init.h>
  21 #include <linux/slab.h>
  22 #include <linux/tty.h>
  23 #include <linux/tty_driver.h>
  24 #include <linux/tty_flip.h>
  25 #include <linux/module.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/uaccess.h>
  28 #include <linux/usb.h>
  29 #include <linux/usb/serial.h>
  30
  31 static bool debug;
  32
  33 /*
  34  * Version Information
  35  */
  36 #define DRIVER_VERSION "v1.3"
  37 #define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Gary Brubaker <xavyer@ix.netcom.com>"
  38 #define DRIVER_DESC "USB Empeg Mark I/II Driver"
  39
  40 #define EMPEG_VENDOR_ID                 0x084f
  41 #define EMPEG_PRODUCT_ID                0x0001
  42
  43 /* function prototypes for an empeg-car player */
  44 static int  empeg_startup(struct usb_serial *serial);
  45 static void empeg_init_termios(struct tty_struct *tty);
  46
  47 static const struct usb_device_id id_table[] = {
  48         { USB_DEVICE(EMPEG_VENDOR_ID, EMPEG_PRODUCT_ID) },
  49         { }                                     /* Terminating entry */
  50 };
  51
  52 MODULE_DEVICE_TABLE(usb, id_table);
  53
  54 static struct usb_serial_driver empeg_device = {
  55         .driver = {
  56                 .owner =        THIS_MODULE,
  57                 .name =         "empeg",
  58         },
  59         .id_table =             id_table,
  60         .num_ports =            1,
  61         .bulk_out_size =        256,
  62         .throttle =             usb_serial_generic_throttle,
  63         .unthrottle =           usb_serial_generic_unthrottle,
  64         .attach =               empeg_startup,
  65         .init_termios =         empeg_init_termios,
  66 };
  67
  68 static struct usb_serial_driver * const serial_drivers[] = {
  69         &empeg_device, NULL
  70 };
  71
  72 static int empeg_startup(struct usb_serial *serial)
  73 {
  74         int r;
  75
  76         if (serial->dev->actconfig->desc.bConfigurationValue != 1) {
  77                 dev_err(&serial->dev->dev, "active config #%d != 1 ??\n",
  78                         serial->dev->actconfig->desc.bConfigurationValue);
  79                 return -ENODEV;
  80         }
  81
  82         r = usb_reset_configuration(serial->dev);
  83
  84         /* continue on with initialization */
  85         return r;
  86 }
  87
  88 static void empeg_init_termios(struct tty_struct *tty)
  89 {
  90         struct ktermios *termios = tty->termios;
  91
  92         /*
  93          * The empeg-car player wants these particular tty settings.
  94          * You could, for example, change the baud rate, however the
  95          * player only supports 115200 (currently), so there is really
  96          * no point in support for changes to the tty settings.
  97          * (at least for now)
  98          *
  99          * The default requirements for this device are:
 100          */
 101         termios->c_iflag
 102                 &= ~(IGNBRK     /* disable ignore break */
 103                 | BRKINT        /* disable break causes interrupt */
 104                 | PARMRK        /* disable mark parity errors */
 105                 | ISTRIP        /* disable clear high bit of input characters */
 106                 | INLCR         /* disable translate NL to CR */
 107                 | IGNCR         /* disable ignore CR */
 108                 | ICRNL         /* disable translate CR to NL */
 109                 | IXON);        /* disable enable XON/XOFF flow control */
 110
 111         termios->c_oflag
 112                 &= ~OPOST;      /* disable postprocess output characters */
 113
 114         termios->c_lflag
 115                 &= ~(ECHO       /* disable echo input characters */
 116                 | ECHONL        /* disable echo new line */
 117                 | ICANON        /* disable erase, kill, werase, and rprnt special characters */
 118                 | ISIG          /* disable interrupt, quit, and suspend special characters */
 119                 | IEXTEN);      /* disable non-POSIX special characters */
 120
 121         termios->c_cflag
 122                 &= ~(CSIZE      /* no size */
 123                 | PARENB        /* disable parity bit */
 124                 | CBAUD);       /* clear current baud rate */
 125
 126         termios->c_cflag
 127                 |= CS8;         /* character size 8 bits */
 128
 129         tty_encode_baud_rate(tty, 115200, 115200);
 130 }
 131
 132 module_usb_serial_driver(serial_drivers, id_table);
 133
 134 MODULE_AUTHOR(DRIVER_AUTHOR);
 135 MODULE_DESCRIPTION(DRIVER_DESC);
 136 MODULE_LICENSE("GPL");
 137
 138 module_param(debug, bool, S_IRUGO | S_IWUSR);
 139 MODULE_PARM_DESC(debug, "Debug enabled or not");