1 /*********************************************************************
2  *
3  * Filename:      esi.c
4  * Version:       1.6
5  * Description:   Driver for the Extended Systems JetEye PC dongle
6  * Status:        Experimental.
7  * Author:        Dag Brattli <dagb@cs.uit.no>
8  * Created at:    Sat Feb 21 18:54:38 1998
9  * Modified at:   Sun Oct 27 22:01:04 2002
10  * Modified by:   Martin Diehl <mad@mdiehl.de>
11  *
12  *     Copyright (c) 1999 Dag Brattli, <dagb@cs.uit.no>,
13  *     Copyright (c) 1998 Thomas Davis, <ratbert@radiks.net>,
14  *     Copyright (c) 2002 Martin Diehl, <mad@mdiehl.de>,
15  *     All Rights Reserved.
16  *
17  *     This program is free software; you can redistribute it and/or
18  *     modify it under the terms of the GNU General Public License as
19  *     published by the Free Software Foundation; either version 2 of
20  *     the License, or (at your option) any later version.
21  *
22  *     This program is distributed in the hope that it will be useful,
23  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
24  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25  *     GNU General Public License for more details.
26  *
27  *     You should have received a copy of the GNU General Public License
28  *     along with this program; if not, write to the Free Software
29  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
30  *     MA 02111-1307 USA
31  *
32  ********************************************************************/
33 
34 #include <linux/module.h>
35 #include <linux/delay.h>
36 #include <linux/init.h>
37 
38 #include <net/irda/irda.h>
39 
40 #include "sir-dev.h"
41 
42 static int esi_open(struct sir_dev *);
43 static int esi_close(struct sir_dev *);
44 static int esi_change_speed(struct sir_dev *, unsigned);
45 static int esi_reset(struct sir_dev *);
46 
47 static struct dongle_driver esi = {
48 	.owner		= THIS_MODULE,
49 	.driver_name	= "JetEye PC ESI-9680 PC",
50 	.type		= IRDA_ESI_DONGLE,
51 	.open		= esi_open,
52 	.close		= esi_close,
53 	.reset		= esi_reset,
54 	.set_speed	= esi_change_speed,
55 };
56 
esi_sir_init(void)57 static int __init esi_sir_init(void)
58 {
59 	return irda_register_dongle(&esi);
60 }
61 
esi_sir_cleanup(void)62 static void __exit esi_sir_cleanup(void)
63 {
64 	irda_unregister_dongle(&esi);
65 }
66 
esi_open(struct sir_dev * dev)67 static int esi_open(struct sir_dev *dev)
68 {
69 	struct qos_info *qos = &dev->qos;
70 
71 	/* Power up and set dongle to 9600 baud */
72 	sirdev_set_dtr_rts(dev, FALSE, TRUE);
73 
74 	qos->baud_rate.bits &= IR_9600|IR_19200|IR_115200;
75 	qos->min_turn_time.bits = 0x01; /* Needs at least 10 ms */
76 	irda_qos_bits_to_value(qos);
77 
78 	/* irda thread waits 50 msec for power settling */
79 
80 	return 0;
81 }
82 
esi_close(struct sir_dev * dev)83 static int esi_close(struct sir_dev *dev)
84 {
85 	/* Power off dongle */
86 	sirdev_set_dtr_rts(dev, FALSE, FALSE);
87 
88 	return 0;
89 }
90 
91 /*
92  * Function esi_change_speed (task)
93  *
94  * Set the speed for the Extended Systems JetEye PC ESI-9680 type dongle
95  * Apparently (see old esi-driver) no delays are needed here...
96  *
97  */
esi_change_speed(struct sir_dev * dev,unsigned speed)98 static int esi_change_speed(struct sir_dev *dev, unsigned speed)
99 {
100 	int ret = 0;
101 	int dtr, rts;
102 
103 	switch (speed) {
104 	case 19200:
105 		dtr = TRUE;
106 		rts = FALSE;
107 		break;
108 	case 115200:
109 		dtr = rts = TRUE;
110 		break;
111 	default:
112 		ret = -EINVAL;
113 		speed = 9600;
114 		/* fall through */
115 	case 9600:
116 		dtr = FALSE;
117 		rts = TRUE;
118 		break;
119 	}
120 
121 	/* Change speed of dongle */
122 	sirdev_set_dtr_rts(dev, dtr, rts);
123 	dev->speed = speed;
124 
125 	return ret;
126 }
127 
128 /*
129  * Function esi_reset (task)
130  *
131  *    Reset dongle;
132  *
133  */
esi_reset(struct sir_dev * dev)134 static int esi_reset(struct sir_dev *dev)
135 {
136 	sirdev_set_dtr_rts(dev, FALSE, FALSE);
137 
138 	/* Hm, the old esi-driver left the dongle unpowered relying on
139 	 * the following speed change to repower. This might work for
140 	 * the esi because we only need the modem lines. However, now the
141 	 * general rule is reset must bring the dongle to some working
142 	 * well-known state because speed change might write to registers.
143 	 * The old esi-driver didn't any delay here - let's hope it' fine.
144 	 */
145 
146 	sirdev_set_dtr_rts(dev, FALSE, TRUE);
147 	dev->speed = 9600;
148 
149 	return 0;
150 }
151 
152 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
153 MODULE_DESCRIPTION("Extended Systems JetEye PC dongle driver");
154 MODULE_LICENSE("GPL");
155 MODULE_ALIAS("irda-dongle-1"); /* IRDA_ESI_DONGLE */
156 
157 module_init(esi_sir_init);
158 module_exit(esi_sir_cleanup);
159 
160