LXR linux/drivers/net/irda/old

   1/*********************************************************************
   2 *                
   3 * Filename:      old_belkin.c
   4 * Version:       1.1
   5 * Description:   Driver for the Belkin (old) SmartBeam dongle
   6 * Status:        Experimental...
   7 * Author:        Jean Tourrilhes <jt@hpl.hp.com>
   8 * Created at:    22/11/99
   9 * Modified at:   Fri Dec 17 09:13:32 1999
  10 * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11 * 
  12 *     Copyright (c) 1999 Jean Tourrilhes, All Rights Reserved.
  13 *     
  14 *     This program is free software; you can redistribute it and/or 
  15 *     modify it under the terms of the GNU General Public License as 
  16 *     published by the Free Software Foundation; either version 2 of 
  17 *     the License, or (at your option) any later version.
  18 * 
  19 *     This program is distributed in the hope that it will be useful,
  20 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  22 *     GNU General Public License for more details.
  23 * 
  24 *     You should have received a copy of the GNU General Public License 
  25 *     along with this program; if not, write to the Free Software 
  26 *     Foundation, Inc., 59 Temple Place, Suite 330, Boston, 
  27 *     MA 02111-1307 USA
  28 *     
  29 ********************************************************************/
  30
  31#include <linux/module.h>
  32#include <linux/delay.h>
  33#include <linux/init.h>
  34
  35#include <net/irda/irda.h>
  36// #include <net/irda/irda_device.h>
  37
  38#include "sir-dev.h"
  39
  40/*
  41 * Belkin is selling a dongle called the SmartBeam.
  42 * In fact, there is two hardware version of this dongle, of course with
  43 * the same name and looking the exactly same (grrr...).
  44 * I guess that I've got the old one, because inside I don't have
  45 * a jumper for IrDA/ASK...
  46 *
  47 * As far as I can make it from info on their web site, the old dongle 
  48 * support only 9600 b/s, which make our life much simpler as far as
  49 * the driver is concerned, but you might not like it very much ;-)
  50 * The new SmartBeam does 115 kb/s, and I've not tested it...
  51 *
  52 * Belkin claim that the correct driver for the old dongle (in Windows)
  53 * is the generic Parallax 9500a driver, but the Linux LiteLink driver
  54 * fails for me (probably because Linux-IrDA doesn't rate fallback),
  55 * so I created this really dumb driver...
  56 *
  57 * In fact, this driver doesn't do much. The only thing it does is to
  58 * prevent Linux-IrDA to use any other speed than 9600 b/s ;-) This
  59 * driver is called "old_belkin" so that when the new SmartBeam is supported
  60 * its driver can be called "belkin" instead of "new_belkin".
  61 *
  62 * Note : this driver was written without any info/help from Belkin,
  63 * so a lot of info here might be totally wrong. Blame me ;-)
  64 */
  65
  66static int old_belkin_open(struct sir_dev *dev);
  67static int old_belkin_close(struct sir_dev *dev);
  68static int old_belkin_change_speed(struct sir_dev *dev, unsigned speed);
  69static int old_belkin_reset(struct sir_dev *dev);
  70
  71static struct dongle_driver old_belkin = {
  72        .owner          = THIS_MODULE,
  73        .driver_name    = "Old Belkin SmartBeam",
  74        .type           = IRDA_OLD_BELKIN_DONGLE,
  75        .open           = old_belkin_open,
  76        .close          = old_belkin_close,
  77        .reset          = old_belkin_reset,
  78        .set_speed      = old_belkin_change_speed,
  79};
  80
  81static int __init old_belkin_sir_init(void)
  82{
  83        return irda_register_dongle(&old_belkin);
  84}
  85
  86static void __exit old_belkin_sir_cleanup(void)
  87{
  88        irda_unregister_dongle(&old_belkin);
  89}
  90
  91static int old_belkin_open(struct sir_dev *dev)
  92{
  93        struct qos_info *qos = &dev->qos;
  94
  95        IRDA_DEBUG(2, "%s()\n", __func__);
  96
  97        /* Power on dongle */
  98        sirdev_set_dtr_rts(dev, TRUE, TRUE);
  99
 100        /* Not too fast, please... */
 101        qos->baud_rate.bits &= IR_9600;
 102        /* Needs at least 10 ms (totally wild guess, can do probably better) */
 103        qos->min_turn_time.bits = 0x01;
 104        irda_qos_bits_to_value(qos);
 105
 106        /* irda thread waits 50 msec for power settling */
 107
 108        return 0;
 109}
 110
 111static int old_belkin_close(struct sir_dev *dev)
 112{
 113        IRDA_DEBUG(2, "%s()\n", __func__);
 114
 115        /* Power off dongle */
 116        sirdev_set_dtr_rts(dev, FALSE, FALSE);
 117
 118        return 0;
 119}
 120
 121/*
 122 * Function old_belkin_change_speed (task)
 123 *
 124 *    With only one speed available, not much to do...
 125 */
 126static int old_belkin_change_speed(struct sir_dev *dev, unsigned speed)
 127{
 128        IRDA_DEBUG(2, "%s()\n", __func__);
 129
 130        dev->speed = 9600;
 131        return (speed==dev->speed) ? 0 : -EINVAL;
 132}
 133
 134/*
 135 * Function old_belkin_reset (task)
 136 *
 137 *      Reset the Old-Belkin type dongle.
 138 *
 139 */
 140static int old_belkin_reset(struct sir_dev *dev)
 141{
 142        IRDA_DEBUG(2, "%s()\n", __func__);
 143
 144        /* This dongles speed "defaults" to 9600 bps ;-) */
 145        dev->speed = 9600;
 146
 147        return 0;
 148}
 149
 150MODULE_AUTHOR("Jean Tourrilhes <jt@hpl.hp.com>");
 151MODULE_DESCRIPTION("Belkin (old) SmartBeam dongle driver");     
 152MODULE_LICENSE("GPL");
 153MODULE_ALIAS("irda-dongle-7"); /* IRDA_OLD_BELKIN_DONGLE */
 154
 155module_init(old_belkin_sir_init);
 156module_exit(old_belkin_sir_cleanup);
 157