drivers/net/irda/old_belkin.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/tty.h>
  34 #include <linux/init.h>
  35
  36 #include <net/irda/irda.h>
  37 #include <net/irda/irda_device.h>
  38
  39 /*
  40  * Belkin is selling a dongle called the SmartBeam.
  41  * In fact, there is two hardware version of this dongle, of course with
  42  * the same name and looking the exactly same (grrr...).
  43  * I guess that I've got the old one, because inside I don't have
  44  * a jumper for IrDA/ASK...
  45  *
  46  * As far as I can make it from info on their web site, the old dongle
  47  * support only 9600 b/s, which make our life much simpler as far as
  48  * the driver is concerned, but you might not like it very much ;-)
  49  * The new SmartBeam does 115 kb/s, and I've not tested it...
  50  *
  51  * Belkin claim that the correct driver for the old dongle (in Windows)
  52  * is the generic Parallax 9500a driver, but the Linux LiteLink driver
  53  * fails for me (probably because Linux-IrDA doesn't rate fallback),
  54  * so I created this really dumb driver...
  55  *
  56  * In fact, this driver doesn't do much. The only thing it does is to
  57  * prevent Linux-IrDA to use any other speed than 9600 b/s ;-) This
  58  * driver is called "old_belkin" so that when the new SmartBeam is supported
  59  * its driver can be called "belkin" instead of "new_belkin".
  60  *
  61  * Note : this driver was written without any info/help from Belkin,
  62  * so a lot of info here might be totally wrong. Blame me ;-)
  63  */
  64
  65 /* Let's guess */
  66 #define MIN_DELAY 25      /* 15 us, but wait a little more to be sure */
  67
  68 static void old_belkin_open(dongle_t *self, struct qos_info *qos);
  69 static void old_belkin_close(dongle_t *self);
  70 static int  old_belkin_change_speed(struct irda_task *task);
  71 static int  old_belkin_reset(struct irda_task *task);
  72
  73 /* These are the baudrates supported */
  74 /* static __u32 baud_rates[] = { 9600 }; */
  75
  76 static struct dongle_reg dongle = {
  77         .type = IRDA_OLD_BELKIN_DONGLE,
  78         .open = old_belkin_open,
  79         .close = old_belkin_close,
  80         .reset = old_belkin_reset,
  81         .change_speed = old_belkin_change_speed,
  82         .owner = THIS_MODULE,
  83 };
  84
  85 static int __init old_belkin_init(void)
  86 {
  87         return irda_device_register_dongle(&dongle);
  88 }
  89
  90 static void __exit old_belkin_cleanup(void)
  91 {
  92         irda_device_unregister_dongle(&dongle);
  93 }
  94
  95 static void old_belkin_open(dongle_t *self, struct qos_info *qos)
  96 {
  97         /* Not too fast, please... */
  98         qos->baud_rate.bits &= IR_9600;
  99         /* Needs at least 10 ms (totally wild guess, can do probably better) */
 100         qos->min_turn_time.bits = 0x01;
 101 }
 102
 103 static void old_belkin_close(dongle_t *self)
 104 {
 105         /* Power off dongle */
 106         self->set_dtr_rts(self->dev, FALSE, FALSE);
 107 }
 108
 109 /*
 110  * Function old_belkin_change_speed (task)
 111  *
 112  *    With only one speed available, not much to do...
 113  */
 114 static int old_belkin_change_speed(struct irda_task *task)
 115 {
 116         irda_task_next_state(task, IRDA_TASK_DONE);
 117
 118         return 0;
 119 }
 120
 121 /*
 122  * Function old_belkin_reset (task)
 123  *
 124  *      Reset the Old-Belkin type dongle.
 125  *
 126  */
 127 static int old_belkin_reset(struct irda_task *task)
 128 {
 129         dongle_t *self = (dongle_t *) task->instance;
 130
 131         /* Power on dongle */
 132         self->set_dtr_rts(self->dev, TRUE, TRUE);
 133
 134         /* Sleep a minimum of 15 us */
 135         udelay(MIN_DELAY);
 136
 137         /* This dongles speed "defaults" to 9600 bps ;-) */
 138         self->speed = 9600;
 139
 140         irda_task_next_state(task, IRDA_TASK_DONE);
 141
 142         return 0;
 143 }
 144
 145 MODULE_AUTHOR("Jean Tourrilhes <jt@hpl.hp.com>");
 146 MODULE_DESCRIPTION("Belkin (old) SmartBeam dongle driver");
 147 MODULE_LICENSE("GPL");
 148 MODULE_ALIAS("irda-dongle-7"); /* IRDA_OLD_BELKIN_DONGLE */
 149
 150 /*
 151  * Function init_module (void)
 152  *
 153  *    Initialize Old-Belkin module
 154  *
 155  */
 156 module_init(old_belkin_init);
 157
 158 /*
 159  * Function cleanup_module (void)
 160  *
 161  *    Cleanup Old-Belkin module
 162  *
 163  */
 164 module_exit(old_belkin_cleanup);