1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
|
/*********************************************************************
*
* Filename: ma600.c
* Version: 0.1
* Description: Implementation of the MA600 dongle
* Status: Experimental.
* Author: Leung <95Etwl@alumni.ee.ust.hk> http://www.engsvr.ust/~eetwl95
* Created at: Sat Jun 10 20:02:35 2000
* Modified at: Sat Aug 16 09:34:13 2003
* Modified by: Martin Diehl <mad@mdiehl.de> (modified for new sir_dev)
*
* Note: very thanks to Mr. Maru Wang <maru@mobileaction.com.tw> for providing
* information on the MA600 dongle
*
* Copyright (c) 2000 Leung, All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*
********************************************************************/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <net/irda/irda.h>
#include "sir-dev.h"
static int ma600_open(struct sir_dev *);
static int ma600_close(struct sir_dev *);
static int ma600_change_speed(struct sir_dev *, unsigned);
static int ma600_reset(struct sir_dev *);
/* control byte for MA600 */
#define MA600_9600 0x00
#define MA600_19200 0x01
#define MA600_38400 0x02
#define MA600_57600 0x03
#define MA600_115200 0x04
#define MA600_DEV_ID1 0x05
#define MA600_DEV_ID2 0x06
#define MA600_2400 0x08
static struct dongle_driver ma600 = {
.owner = THIS_MODULE,
.driver_name = "MA600",
.type = IRDA_MA600_DONGLE,
.open = ma600_open,
.close = ma600_close,
.reset = ma600_reset,
.set_speed = ma600_change_speed,
};
static int __init ma600_sir_init(void)
{
IRDA_DEBUG(2, "%s()\n", __func__);
return irda_register_dongle(&ma600);
}
static void __exit ma600_sir_cleanup(void)
{
IRDA_DEBUG(2, "%s()\n", __func__);
irda_unregister_dongle(&ma600);
}
/*
Power on:
(0) Clear RTS and DTR for 1 second
(1) Set RTS and DTR for 1 second
(2) 9600 bps now
Note: assume RTS, DTR are clear before
*/
static int ma600_open(struct sir_dev *dev)
{
struct qos_info *qos = &dev->qos;
IRDA_DEBUG(2, "%s()\n", __func__);
sirdev_set_dtr_rts(dev, TRUE, TRUE);
/* Explicitly set the speeds we can accept */
qos->baud_rate.bits &= IR_2400|IR_9600|IR_19200|IR_38400
|IR_57600|IR_115200;
/* Hm, 0x01 means 10ms - for >= 1ms we would need 0x07 */
qos->min_turn_time.bits = 0x01; /* Needs at least 1 ms */
irda_qos_bits_to_value(qos);
/* irda thread waits 50 msec for power settling */
return 0;
}
static int ma600_close(struct sir_dev *dev)
{
IRDA_DEBUG(2, "%s()\n", __func__);
/* Power off dongle */
sirdev_set_dtr_rts(dev, FALSE, FALSE);
return 0;
}
static __u8 get_control_byte(__u32 speed)
{
__u8 byte;
switch (speed) {
default:
case 115200:
byte = MA600_115200;
break;
case 57600:
byte = MA600_57600;
break;
case 38400:
byte = MA600_38400;
break;
case 19200:
byte = MA600_19200;
break;
case 9600:
byte = MA600_9600;
break;
case 2400:
byte = MA600_2400;
break;
}
return byte;
}
/*
* Function ma600_change_speed (dev, speed)
*
* Set the speed for the MA600 type dongle.
*
* The dongle has already been reset to a known state (dongle default)
* We cycle through speeds by pulsing RTS low and then high.
*/
/*
* Function ma600_change_speed (dev, speed)
*
* Set the speed for the MA600 type dongle.
*
* Algorithm
* 1. Reset (already done by irda thread state machine)
* 2. clear RTS, set DTR and wait for 1ms
* 3. send Control Byte to the MA600 through TXD to set new baud rate
* wait until the stop bit of Control Byte is sent (for 9600 baud rate,
* it takes about 10 msec)
* 4. set RTS, set DTR (return to NORMAL Operation)
* 5. wait at least 10 ms, new setting (baud rate, etc) takes effect here
* after
*/
/* total delays are only about 20ms - let's just sleep for now to
* avoid the state machine complexity before we get things working
*/
static int ma600_change_speed(struct sir_dev *dev, unsigned speed)
{
u8 byte;
IRDA_DEBUG(2, "%s(), speed=%d (was %d)\n", __func__,
speed, dev->speed);
/* dongle already reset, dongle and port at default speed (9600) */
/* Set RTS low for 1 ms */
sirdev_set_dtr_rts(dev, TRUE, FALSE);
mdelay(1);
/* Write control byte */
byte = get_control_byte(speed);
sirdev_raw_write(dev, &byte, sizeof(byte));
/* Wait at least 10ms: fake wait_until_sent - 10 bits at 9600 baud*/
msleep(15); /* old ma600 uses 15ms */
#if 1
/* read-back of the control byte. ma600 is the first dongle driver
* which uses this so there might be some unidentified issues.
* Disable this in case of problems with readback.
*/
sirdev_raw_read(dev, &byte, sizeof(byte));
if (byte != get_control_byte(speed)) {
IRDA_WARNING("%s(): bad control byte read-back %02x != %02x\n",
__func__, (unsigned) byte,
(unsigned) get_control_byte(speed));
return -1;
}
else
IRDA_DEBUG(2, "%s() control byte write read OK\n", __func__);
#endif
/* Set DTR, Set RTS */
sirdev_set_dtr_rts(dev, TRUE, TRUE);
/* Wait at least 10ms */
msleep(10);
/* dongle is now switched to the new speed */
dev->speed = speed;
return 0;
}
/*
* Function ma600_reset (dev)
*
* This function resets the ma600 dongle.
*
* Algorithm:
* 0. DTR=0, RTS=1 and wait 10 ms
* 1. DTR=1, RTS=1 and wait 10 ms
* 2. 9600 bps now
*/
/* total delays are only about 20ms - let's just sleep for now to
* avoid the state machine complexity before we get things working
*/
static int ma600_reset(struct sir_dev *dev)
{
IRDA_DEBUG(2, "%s()\n", __func__);
/* Reset the dongle : set DTR low for 10 ms */
sirdev_set_dtr_rts(dev, FALSE, TRUE);
msleep(10);
/* Go back to normal mode */
sirdev_set_dtr_rts(dev, TRUE, TRUE);
msleep(10);
dev->speed = 9600; /* That's the dongle-default */
return 0;
}
MODULE_AUTHOR("Leung <95Etwl@alumni.ee.ust.hk> http://www.engsvr.ust/~eetwl95");
MODULE_DESCRIPTION("MA600 dongle driver version 0.1");
MODULE_LICENSE("GPL");
MODULE_ALIAS("irda-dongle-11"); /* IRDA_MA600_DONGLE */
module_init(ma600_sir_init);
module_exit(ma600_sir_cleanup);
|
