1/*********************************************************************
2 *
3 * Filename:      ma600.c
4 * Version:       0.1
5 * Description:   Implementation of the MA600 dongle
6 * Status:        Experimental.
7 * Author:        Leung <95Etwl@alumni.ee.ust.hk> http://www.engsvr.ust/~eetwl95
8 * Created at:    Sat Jun 10 20:02:35 2000
9 * Modified at:   Sat Aug 16 09:34:13 2003
10 * Modified by:   Martin Diehl <mad@mdiehl.de> (modified for new sir_dev)
11 *
12 * Note: very thanks to Mr. Maru Wang <maru@mobileaction.com.tw> for providing
13 *       information on the MA600 dongle
14 *
15 *     Copyright (c) 2000 Leung, 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
42static int ma600_open(struct sir_dev *);
43static int ma600_close(struct sir_dev *);
44static int ma600_change_speed(struct sir_dev *, unsigned);
45static int ma600_reset(struct sir_dev *);
46
47/* control byte for MA600 */
48#define MA600_9600	0x00
49#define MA600_19200	0x01
50#define MA600_38400	0x02
51#define MA600_57600	0x03
52#define MA600_115200	0x04
53#define MA600_DEV_ID1	0x05
54#define MA600_DEV_ID2	0x06
55#define MA600_2400	0x08
56
57static struct dongle_driver ma600 = {
58	.owner          = THIS_MODULE,
59	.driver_name    = "MA600",
60	.type           = IRDA_MA600_DONGLE,
61	.open           = ma600_open,
62	.close          = ma600_close,
63	.reset          = ma600_reset,
64	.set_speed      = ma600_change_speed,
65};
66
67
68static int __init ma600_sir_init(void)
69{
70	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
71	return irda_register_dongle(&ma600);
72}
73
74static void __exit ma600_sir_cleanup(void)
75{
76	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
77	irda_unregister_dongle(&ma600);
78}
79
80/*
81	Power on:
82		(0) Clear RTS and DTR for 1 second
83		(1) Set RTS and DTR for 1 second
84		(2) 9600 bps now
85	Note: assume RTS, DTR are clear before
86*/
87static int ma600_open(struct sir_dev *dev)
88{
89	struct qos_info *qos = &dev->qos;
90
91	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
92
93	sirdev_set_dtr_rts(dev, TRUE, TRUE);
94
95	/* Explicitly set the speeds we can accept */
96	qos->baud_rate.bits &= IR_2400|IR_9600|IR_19200|IR_38400
97				|IR_57600|IR_115200;
98	/* Hm, 0x01 means 10ms - for >= 1ms we would need 0x07 */
99	qos->min_turn_time.bits = 0x01;		/* Needs at least 1 ms */
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 ma600_close(struct sir_dev *dev)
108{
109	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
110
111	/* Power off dongle */
112	sirdev_set_dtr_rts(dev, FALSE, FALSE);
113
114	return 0;
115}
116
117static __u8 get_control_byte(__u32 speed)
118{
119	__u8 byte;
120
121	switch (speed) {
122	default:
123	case 115200:
124		byte = MA600_115200;
125		break;
126	case 57600:
127		byte = MA600_57600;
128		break;
129	case 38400:
130		byte = MA600_38400;
131		break;
132	case 19200:
133		byte = MA600_19200;
134		break;
135	case 9600:
136		byte = MA600_9600;
137		break;
138	case 2400:
139		byte = MA600_2400;
140		break;
141	}
142
143	return byte;
144}
145
146/*
147 * Function ma600_change_speed (dev, speed)
148 *
149 *    Set the speed for the MA600 type dongle.
150 *
151 *    The dongle has already been reset to a known state (dongle default)
152 *    We cycle through speeds by pulsing RTS low and then high.
153 */
154
155/*
156 * Function ma600_change_speed (dev, speed)
157 *
158 *    Set the speed for the MA600 type dongle.
159 *
160 *    Algorithm
161 *    1. Reset (already done by irda thread state machine)
162 *    2. clear RTS, set DTR and wait for 1ms
163 *    3. send Control Byte to the MA600 through TXD to set new baud rate
164 *       wait until the stop bit of Control Byte is sent (for 9600 baud rate,
165 *       it takes about 10 msec)
166 *    4. set RTS, set DTR (return to NORMAL Operation)
167 *    5. wait at least 10 ms, new setting (baud rate, etc) takes effect here
168 *       after
169 */
170
171/* total delays are only about 20ms - let's just sleep for now to
172 * avoid the state machine complexity before we get things working
173 */
174
175static int ma600_change_speed(struct sir_dev *dev, unsigned speed)
176{
177	u8	byte;
178
179	IRDA_DEBUG(2, "%s(), speed=%d (was %d)\n", __FUNCTION__,
180		speed, dev->speed);
181
182	/* dongle already reset, dongle and port at default speed (9600) */
183
184	/* Set RTS low for 1 ms */
185	sirdev_set_dtr_rts(dev, TRUE, FALSE);
186	mdelay(1);
187
188	/* Write control byte */
189	byte = get_control_byte(speed);
190	sirdev_raw_write(dev, &byte, sizeof(byte));
191
192	/* Wait at least 10ms: fake wait_until_sent - 10 bits at 9600 baud*/
193	msleep(15);					/* old ma600 uses 15ms */
194
195	/* read-back of the control byte. ma600 is the first dongle driver
196	 * which uses this so there might be some unidentified issues.
197	 * Disable this in case of problems with readback.
198	 */
199
200	sirdev_raw_read(dev, &byte, sizeof(byte));
201	if (byte != get_control_byte(speed))  {
202		IRDA_WARNING("%s(): bad control byte read-back %02x != %02x\n",
203			     __FUNCTION__, (unsigned) byte,
204			     (unsigned) get_control_byte(speed));
205		return -1;
206	}
207	else
208		IRDA_DEBUG(2, "%s() control byte write read OK\n", __FUNCTION__);
209
210	/* Set DTR, Set RTS */
211	sirdev_set_dtr_rts(dev, TRUE, TRUE);
212
213	/* Wait at least 10ms */
214	msleep(10);
215
216	/* dongle is now switched to the new speed */
217	dev->speed = speed;
218
219	return 0;
220}
221
222/*
223 * Function ma600_reset (dev)
224 *
225 *      This function resets the ma600 dongle.
226 *
227 *      Algorithm:
228 *    	  0. DTR=0, RTS=1 and wait 10 ms
229 *    	  1. DTR=1, RTS=1 and wait 10 ms
230 *        2. 9600 bps now
231 */
232
233/* total delays are only about 20ms - let's just sleep for now to
234 * avoid the state machine complexity before we get things working
235 */
236
237int ma600_reset(struct sir_dev *dev)
238{
239	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
240
241	/* Reset the dongle : set DTR low for 10 ms */
242	sirdev_set_dtr_rts(dev, FALSE, TRUE);
243	msleep(10);
244
245	/* Go back to normal mode */
246	sirdev_set_dtr_rts(dev, TRUE, TRUE);
247	msleep(10);
248
249	dev->speed = 9600;      /* That's the dongle-default */
250
251	return 0;
252}
253
254MODULE_AUTHOR("Leung <95Etwl@alumni.ee.ust.hk> http://www.engsvr.ust/~eetwl95");
255MODULE_DESCRIPTION("MA600 dongle driver version 0.1");
256MODULE_LICENSE("GPL");
257MODULE_ALIAS("irda-dongle-11"); /* IRDA_MA600_DONGLE */
258
259module_init(ma600_sir_init);
260module_exit(ma600_sir_cleanup);
261