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 int 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_driver empeg_driver = {
  55         .name =         "empeg",
  56         .probe =        usb_serial_probe,
  57         .disconnect =   usb_serial_disconnect,
  58         .id_table =     id_table,
  59         .no_dynamic_id =        1,
  60 };
  61
  62 static struct usb_serial_driver empeg_device = {
  63         .driver = {
  64                 .owner =        THIS_MODULE,
  65                 .name =         "empeg",
  66         },
  67         .id_table =             id_table,
  68         .usb_driver =           &empeg_driver,
  69         .num_ports =            1,
  70         .bulk_out_size =        256,
  71         .throttle =             usb_serial_generic_throttle,
  72         .unthrottle =           usb_serial_generic_unthrottle,
  73         .attach =               empeg_startup,
  74         .init_termios =         empeg_init_termios,
  75 };
  76
  77 static int empeg_startup(struct usb_serial *serial)
  78 {
  79         int r;
  80
  81         dbg("%s", __func__);
  82
  83         if (serial->dev->actconfig->desc.bConfigurationValue != 1) {
  84                 dev_err(&serial->dev->dev, "active config #%d != 1 ??\n",
  85                         serial->dev->actconfig->desc.bConfigurationValue);
  86                 return -ENODEV;
  87         }
  88         dbg("%s - reset config", __func__);
  89         r = usb_reset_configuration(serial->dev);
  90
  91         /* continue on with initialization */
  92         return r;
  93 }
  94
  95 static void empeg_init_termios(struct tty_struct *tty)
  96 {
  97         struct ktermios *termios = tty->termios;
  98
  99         /*
 100          * The empeg-car player wants these particular tty settings.
 101          * You could, for example, change the baud rate, however the
 102          * player only supports 115200 (currently), so there is really
 103          * no point in support for changes to the tty settings.
 104          * (at least for now)
 105          *
 106          * The default requirements for this device are:
 107          */
 108         termios->c_iflag
 109                 &= ~(IGNBRK     /* disable ignore break */
 110                 | BRKINT        /* disable break causes interrupt */
 111                 | PARMRK        /* disable mark parity errors */
 112                 | ISTRIP        /* disable clear high bit of input characters */
 113                 | INLCR         /* disable translate NL to CR */
 114                 | IGNCR         /* disable ignore CR */
 115                 | ICRNL         /* disable translate CR to NL */
 116                 | IXON);        /* disable enable XON/XOFF flow control */
 117
 118         termios->c_oflag
 119                 &= ~OPOST;      /* disable postprocess output characters */
 120
 121         termios->c_lflag
 122                 &= ~(ECHO       /* disable echo input characters */
 123                 | ECHONL        /* disable echo new line */
 124                 | ICANON        /* disable erase, kill, werase, and rprnt special characters */
 125                 | ISIG          /* disable interrupt, quit, and suspend special characters */
 126                 | IEXTEN);      /* disable non-POSIX special characters */
 127
 128         termios->c_cflag
 129                 &= ~(CSIZE      /* no size */
 130                 | PARENB        /* disable parity bit */
 131                 | CBAUD);       /* clear current baud rate */
 132
 133         termios->c_cflag
 134                 |= CS8;         /* character size 8 bits */
 135
 136         tty_encode_baud_rate(tty, 115200, 115200);
 137 }
 138
 139 static int __init empeg_init(void)
 140 {
 141         int retval;
 142
 143         retval = usb_serial_register(&empeg_device);
 144         if (retval)
 145                 return retval;
 146         retval = usb_register(&empeg_driver);
 147         if (retval) {
 148                 usb_serial_deregister(&empeg_device);
 149                 return retval;
 150         }
 151         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 152                DRIVER_DESC "\n");
 153
 154         return 0;
 155 }
 156
 157 static void __exit empeg_exit(void)
 158 {
 159         usb_deregister(&empeg_driver);
 160         usb_serial_deregister(&empeg_device);
 161 }
 162
 163
 164 module_init(empeg_init);
 165 module_exit(empeg_exit);
 166
 167 MODULE_AUTHOR(DRIVER_AUTHOR);
 168 MODULE_DESCRIPTION(DRIVER_DESC);
 169 MODULE_LICENSE("GPL");
 170
 171 module_param(debug, bool, S_IRUGO | S_IWUSR);
 172 MODULE_PARM_DESC(debug, "Debug enabled or not");