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old_belkin-sir.c
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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 <[email protected]>
8  * Created at: 22/11/99
9  * Modified at: Fri Dec 17 09:13:32 1999
10  * Modified by: Dag Brattli <[email protected]>
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 */
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;
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 */
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 <[email protected]>");
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);