drivers/net/irda/old_belkin-sir.c

   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
  66 static int old_belkin_open(struct sir_dev *dev);
  67 static int old_belkin_close(struct sir_dev *dev);
  68 static int old_belkin_change_speed(struct sir_dev *dev, unsigned speed);
  69 static int old_belkin_reset(struct sir_dev *dev);
  70
  71 static 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
  81 static int __init old_belkin_sir_init(void)
  82 {
  83         return irda_register_dongle(&old_belkin);
  84 }
  85
  86 static void __exit old_belkin_sir_cleanup(void)
  87 {
  88         irda_unregister_dongle(&old_belkin);
  89 }
  90
  91 static 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
 111 static 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  */
 126 static 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  */
 140 static 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
 150 MODULE_AUTHOR("Jean Tourrilhes <jt@hpl.hp.com>");
 151 MODULE_DESCRIPTION("Belkin (old) SmartBeam dongle driver");
 152 MODULE_LICENSE("GPL");
 153 MODULE_ALIAS("irda-dongle-7"); /* IRDA_OLD_BELKIN_DONGLE */
 154
 155 module_init(old_belkin_sir_init);
 156 module_exit(old_belkin_sir_cleanup);