File: /usr/src/linux/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/sched.h>
35 #include <linux/init.h>
36 #include <linux/irda.h>
37
38 #include <net/irda/irda.h>
39 #include <net/irda/irmod.h>
40 #include <net/irda/irda_device.h>
41
42 /*
43 * Belkin is selling a dongle called the SmartBeam.
44 * In fact, there is two hardware version of this dongle, of course with
45 * the same name and looking the exactly same (grrr...).
46 * I guess that I've got the old one, because inside I don't have
47 * a jumper for IrDA/ASK...
48 *
49 * As far as I can make it from info on their web site, the old dongle
50 * support only 9600 b/s, which make our life much simpler as far as
51 * the driver is concerned, but you might not like it very much ;-)
52 * The new SmartBeam does 115 kb/s, and I've not tested it...
53 *
54 * Belkin claim that the correct driver for the old dongle (in Windows)
55 * is the generic Parallax 9500a driver, but the Linux LiteLink driver
56 * fails for me (probably because Linux-IrDA doesn't rate fallback),
57 * so I created this really dumb driver...
58 *
59 * In fact, this driver doesn't do much. The only thing it does is to
60 * prevent Linux-IrDA to use any other speed than 9600 b/s ;-) This
61 * driver is called "old_belkin" so that when the new SmartBeam is supported
62 * its driver can be called "belkin" instead of "new_belkin".
63 *
64 * Note : this driver was written without any info/help from Belkin,
65 * so a lot of info here might be totally wrong. Blame me ;-)
66 */
67
68 /* Let's guess */
69 #define MIN_DELAY 25 /* 15 us, but wait a little more to be sure */
70
71 static void old_belkin_open(dongle_t *self, struct qos_info *qos);
72 static void old_belkin_close(dongle_t *self);
73 static int old_belkin_change_speed(struct irda_task *task);
74 static int old_belkin_reset(struct irda_task *task);
75
76 /* These are the baudrates supported */
77 /* static __u32 baud_rates[] = { 9600 }; */
78
79 static struct dongle_reg dongle = {
80 Q_NULL,
81 IRDA_OLD_BELKIN_DONGLE,
82 old_belkin_open,
83 old_belkin_close,
84 old_belkin_reset,
85 old_belkin_change_speed,
86 };
87
88 int __init old_belkin_init(void)
89 {
90 return irda_device_register_dongle(&dongle);
91 }
92
93 void old_belkin_cleanup(void)
94 {
95 irda_device_unregister_dongle(&dongle);
96 }
97
98 static void old_belkin_open(dongle_t *self, struct qos_info *qos)
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
105 MOD_INC_USE_COUNT;
106 }
107
108 static void old_belkin_close(dongle_t *self)
109 {
110 /* Power off dongle */
111 self->set_dtr_rts(self->dev, FALSE, FALSE);
112
113 MOD_DEC_USE_COUNT;
114 }
115
116 /*
117 * Function old_belkin_change_speed (task)
118 *
119 * With only one speed available, not much to do...
120 */
121 static int old_belkin_change_speed(struct irda_task *task)
122 {
123 irda_task_next_state(task, IRDA_TASK_DONE);
124
125 return 0;
126 }
127
128 /*
129 * Function old_belkin_reset (task)
130 *
131 * Reset the Old-Belkin type dongle.
132 *
133 */
134 static int old_belkin_reset(struct irda_task *task)
135 {
136 dongle_t *self = (dongle_t *) task->instance;
137
138 /* Power on dongle */
139 self->set_dtr_rts(self->dev, TRUE, TRUE);
140
141 /* Sleep a minimum of 15 us */
142 udelay(MIN_DELAY);
143
144 /* This dongles speed "defaults" to 9600 bps ;-) */
145 self->speed = 9600;
146
147 irda_task_next_state(task, IRDA_TASK_DONE);
148
149 return 0;
150 }
151
152 #ifdef MODULE
153 MODULE_AUTHOR("Jean Tourrilhes <jt@hpl.hp.com>");
154 MODULE_DESCRIPTION("Belkin (old) SmartBeam dongle driver");
155
156 /*
157 * Function init_module (void)
158 *
159 * Initialize Old-Belkin module
160 *
161 */
162 int init_module(void)
163 {
164 return old_belkin_init();
165 }
166
167 /*
168 * Function cleanup_module (void)
169 *
170 * Cleanup Old-Belkin module
171 *
172 */
173 void cleanup_module(void)
174 {
175 old_belkin_cleanup();
176 }
177 #endif /* MODULE */
178
179