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/drivers/net/irda/old_belkin-sir.c

http://github.com/mirrors/linux
C | 146 lines | 56 code | 20 blank | 70 comment | 0 complexity | ee17bbaa7049b29f2df5de275bcbab80 MD5 | raw file
  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
 64static int old_belkin_open(struct sir_dev *dev);
 65static int old_belkin_close(struct sir_dev *dev);
 66static int old_belkin_change_speed(struct sir_dev *dev, unsigned speed);
 67static int old_belkin_reset(struct sir_dev *dev);
 68
 69static 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
 79static int __init old_belkin_sir_init(void)
 80{
 81	return irda_register_dongle(&old_belkin);
 82}
 83
 84static void __exit old_belkin_sir_cleanup(void)
 85{
 86	irda_unregister_dongle(&old_belkin);
 87}
 88
 89static 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
107static 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 */
120static 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 */
132static 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
140MODULE_AUTHOR("Jean Tourrilhes <jt@hpl.hp.com>");
141MODULE_DESCRIPTION("Belkin (old) SmartBeam dongle driver");	
142MODULE_LICENSE("GPL");
143MODULE_ALIAS("irda-dongle-7"); /* IRDA_OLD_BELKIN_DONGLE */
144
145module_init(old_belkin_sir_init);
146module_exit(old_belkin_sir_cleanup);