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, see <http://www.gnu.org/licenses/>.
  26  *
  27  ********************************************************************/
  28
  29 #include <linux/module.h>
  30 #include <linux/delay.h>
  31 #include <linux/init.h>
  32
  33 #include <net/irda/irda.h>
  34 // #include <net/irda/irda_device.h>
  35
  36 #include "sir-dev.h"
  37
  38 /*
  39  * Belkin is selling a dongle called the SmartBeam.
  40  * In fact, there is two hardware version of this dongle, of course with
  41  * the same name and looking the exactly same (grrr...).
  42  * I guess that I've got the old one, because inside I don't have
  43  * a jumper for IrDA/ASK...
  44  *
  45  * As far as I can make it from info on their web site, the old dongle
  46  * support only 9600 b/s, which make our life much simpler as far as
  47  * the driver is concerned, but you might not like it very much ;-)
  48  * The new SmartBeam does 115 kb/s, and I've not tested it...
  49  *
  50  * Belkin claim that the correct driver for the old dongle (in Windows)
  51  * is the generic Parallax 9500a driver, but the Linux LiteLink driver
  52  * fails for me (probably because Linux-IrDA doesn't rate fallback),
  53  * so I created this really dumb driver...
  54  *
  55  * In fact, this driver doesn't do much. The only thing it does is to
  56  * prevent Linux-IrDA to use any other speed than 9600 b/s ;-) This
  57  * driver is called "old_belkin" so that when the new SmartBeam is supported
  58  * its driver can be called "belkin" instead of "new_belkin".
  59  *
  60  * Note : this driver was written without any info/help from Belkin,
  61  * so a lot of info here might be totally wrong. Blame me ;-)
  62  */
  63
  64 static int old_belkin_open(struct sir_dev *dev);
  65 static int old_belkin_close(struct sir_dev *dev);
  66 static int old_belkin_change_speed(struct sir_dev *dev, unsigned speed);
  67 static int old_belkin_reset(struct sir_dev *dev);
  68
  69 static struct dongle_driver old_belkin = {
  70         .owner          = THIS_MODULE,
  71         .driver_name    = "Old Belkin SmartBeam",
  72         .type           = IRDA_OLD_BELKIN_DONGLE,
  73         .open           = old_belkin_open,
  74         .close          = old_belkin_close,
  75         .reset          = old_belkin_reset,
  76         .set_speed      = old_belkin_change_speed,
  77 };
  78
  79 static int __init old_belkin_sir_init(void)
  80 {
  81         return irda_register_dongle(&old_belkin);
  82 }
  83
  84 static void __exit old_belkin_sir_cleanup(void)
  85 {
  86         irda_unregister_dongle(&old_belkin);
  87 }
  88
  89 static int old_belkin_open(struct sir_dev *dev)
  90 {
  91         struct qos_info *qos = &dev->qos;
  92
  93         /* Power on dongle */
  94         sirdev_set_dtr_rts(dev, TRUE, TRUE);
  95
  96         /* Not too fast, please... */
  97         qos->baud_rate.bits &= IR_9600;
  98         /* Needs at least 10 ms (totally wild guess, can do probably better) */
  99         qos->min_turn_time.bits = 0x01;
 100         irda_qos_bits_to_value(qos);
 101
 102         /* irda thread waits 50 msec for power settling */
 103
 104         return 0;
 105 }
 106
 107 static int old_belkin_close(struct sir_dev *dev)
 108 {
 109         /* Power off dongle */
 110         sirdev_set_dtr_rts(dev, FALSE, FALSE);
 111
 112         return 0;
 113 }
 114
 115 /*
 116  * Function old_belkin_change_speed (task)
 117  *
 118  *    With only one speed available, not much to do...
 119  */
 120 static int old_belkin_change_speed(struct sir_dev *dev, unsigned speed)
 121 {
 122         dev->speed = 9600;
 123         return (speed==dev->speed) ? 0 : -EINVAL;
 124 }
 125
 126 /*
 127  * Function old_belkin_reset (task)
 128  *
 129  *      Reset the Old-Belkin type dongle.
 130  *
 131  */
 132 static int old_belkin_reset(struct sir_dev *dev)
 133 {
 134         /* This dongles speed "defaults" to 9600 bps ;-) */
 135         dev->speed = 9600;
 136
 137         return 0;
 138 }
 139
 140 MODULE_AUTHOR("Jean Tourrilhes <jt@hpl.hp.com>");
 141 MODULE_DESCRIPTION("Belkin (old) SmartBeam dongle driver");
 142 MODULE_LICENSE("GPL");
 143 MODULE_ALIAS("irda-dongle-7"); /* IRDA_OLD_BELKIN_DONGLE */
 144
 145 module_init(old_belkin_sir_init);
 146 module_exit(old_belkin_sir_cleanup);