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)
12 * Note: very thanks to Mr. Maru Wang <maru@mobileaction.com.tw> for providing
13 * information on the MA600 dongle
15 * Copyright (c) 2000 Leung, All Rights Reserved.
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.
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.
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,
32 ********************************************************************/
34 #include <linux/module.h>
35 #include <linux/delay.h>
36 #include <linux/init.h>
38 #include <net/irda/irda.h>
42 static int ma600_open(struct sir_dev *);
43 static int ma600_close(struct sir_dev *);
44 static int ma600_change_speed(struct sir_dev *, unsigned);
45 static int ma600_reset(struct sir_dev *);
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
57 static struct dongle_driver ma600 = {
59 .driver_name = "MA600",
60 .type = IRDA_MA600_DONGLE,
64 .set_speed = ma600_change_speed,
68 static int __init ma600_sir_init(void)
70 IRDA_DEBUG(2, "%s()\n", __func__);
71 return irda_register_dongle(&ma600);
74 static void __exit ma600_sir_cleanup(void)
76 IRDA_DEBUG(2, "%s()\n", __func__);
77 irda_unregister_dongle(&ma600);
82 (0) Clear RTS and DTR for 1 second
83 (1) Set RTS and DTR for 1 second
85 Note: assume RTS, DTR are clear before
87 static int ma600_open(struct sir_dev *dev)
89 struct qos_info *qos = &dev->qos;
91 IRDA_DEBUG(2, "%s()\n", __func__);
93 sirdev_set_dtr_rts(dev, TRUE, TRUE);
95 /* Explicitly set the speeds we can accept */
96 qos->baud_rate.bits &= IR_2400|IR_9600|IR_19200|IR_38400
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);
102 /* irda thread waits 50 msec for power settling */
107 static int ma600_close(struct sir_dev *dev)
109 IRDA_DEBUG(2, "%s()\n", __func__);
111 /* Power off dongle */
112 sirdev_set_dtr_rts(dev, FALSE, FALSE);
117 static __u8 get_control_byte(__u32 speed)
147 * Function ma600_change_speed (dev, speed)
149 * Set the speed for the MA600 type dongle.
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.
156 * Function ma600_change_speed (dev, speed)
158 * Set the speed for the MA600 type dongle.
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
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
175 static int ma600_change_speed(struct sir_dev *dev, unsigned speed)
179 IRDA_DEBUG(2, "%s(), speed=%d (was %d)\n", __func__,
182 /* dongle already reset, dongle and port at default speed (9600) */
184 /* Set RTS low for 1 ms */
185 sirdev_set_dtr_rts(dev, TRUE, FALSE);
188 /* Write control byte */
189 byte = get_control_byte(speed);
190 sirdev_raw_write(dev, &byte, sizeof(byte));
192 /* Wait at least 10ms: fake wait_until_sent - 10 bits at 9600 baud*/
193 msleep(15); /* old ma600 uses 15ms */
196 /* read-back of the control byte. ma600 is the first dongle driver
197 * which uses this so there might be some unidentified issues.
198 * Disable this in case of problems with readback.
201 sirdev_raw_read(dev, &byte, sizeof(byte));
202 if (byte != get_control_byte(speed)) {
203 IRDA_WARNING("%s(): bad control byte read-back %02x != %02x\n",
204 __func__, (unsigned) byte,
205 (unsigned) get_control_byte(speed));
209 IRDA_DEBUG(2, "%s() control byte write read OK\n", __func__);
212 /* Set DTR, Set RTS */
213 sirdev_set_dtr_rts(dev, TRUE, TRUE);
215 /* Wait at least 10ms */
218 /* dongle is now switched to the new speed */
225 * Function ma600_reset (dev)
227 * This function resets the ma600 dongle.
230 * 0. DTR=0, RTS=1 and wait 10 ms
231 * 1. DTR=1, RTS=1 and wait 10 ms
235 /* total delays are only about 20ms - let's just sleep for now to
236 * avoid the state machine complexity before we get things working
239 static int ma600_reset(struct sir_dev *dev)
241 IRDA_DEBUG(2, "%s()\n", __func__);
243 /* Reset the dongle : set DTR low for 10 ms */
244 sirdev_set_dtr_rts(dev, FALSE, TRUE);
247 /* Go back to normal mode */
248 sirdev_set_dtr_rts(dev, TRUE, TRUE);
251 dev->speed = 9600; /* That's the dongle-default */
256 MODULE_AUTHOR("Leung <95Etwl@alumni.ee.ust.hk> http://www.engsvr.ust/~eetwl95");
257 MODULE_DESCRIPTION("MA600 dongle driver version 0.1");
258 MODULE_LICENSE("GPL");
259 MODULE_ALIAS("irda-dongle-11"); /* IRDA_MA600_DONGLE */
261 module_init(ma600_sir_init);
262 module_exit(ma600_sir_cleanup);