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1 | /********************************************************************* |
2 | * | |
3 | * Filename: tekram.c | |
4 | * Version: 1.3 | |
5 | * Description: Implementation of the Tekram IrMate IR-210B dongle | |
6 | * Status: Experimental. | |
7 | * Author: Dag Brattli <dagb@cs.uit.no> | |
8 | * Created at: Wed Oct 21 20:02:35 1998 | |
9 | * Modified at: Sun Oct 27 22:02:38 2002 | |
10 | * Modified by: Martin Diehl <mad@mdiehl.de> | |
11 | * | |
12 | * Copyright (c) 1998-1999 Dag Brattli, | |
13 | * Copyright (c) 2002 Martin Diehl, | |
14 | * All Rights Reserved. | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or | |
17 | * modify it under the terms of the GNU General Public License as | |
18 | * published by the Free Software Foundation; either version 2 of | |
19 | * the License, or (at your option) any later version. | |
20 | * | |
96de0e25 | 21 | * Neither Dag Brattli nor University of Tromsø admit liability nor |
1da177e4 LT |
22 | * provide warranty for any of this software. This material is |
23 | * provided "AS-IS" and at no charge. | |
24 | * | |
25 | ********************************************************************/ | |
26 | ||
27 | #include <linux/module.h> | |
28 | #include <linux/delay.h> | |
29 | #include <linux/init.h> | |
30 | ||
31 | #include <net/irda/irda.h> | |
32 | ||
33 | #include "sir-dev.h" | |
34 | ||
35 | static int tekram_delay = 150; /* default is 150 ms */ | |
36 | module_param(tekram_delay, int, 0); | |
37 | MODULE_PARM_DESC(tekram_delay, "tekram dongle write complete delay"); | |
38 | ||
39 | static int tekram_open(struct sir_dev *); | |
40 | static int tekram_close(struct sir_dev *); | |
41 | static int tekram_change_speed(struct sir_dev *, unsigned); | |
42 | static int tekram_reset(struct sir_dev *); | |
43 | ||
44 | #define TEKRAM_115200 0x00 | |
45 | #define TEKRAM_57600 0x01 | |
46 | #define TEKRAM_38400 0x02 | |
47 | #define TEKRAM_19200 0x03 | |
48 | #define TEKRAM_9600 0x04 | |
49 | ||
50 | #define TEKRAM_PW 0x10 /* Pulse select bit */ | |
51 | ||
52 | static struct dongle_driver tekram = { | |
53 | .owner = THIS_MODULE, | |
54 | .driver_name = "Tekram IR-210B", | |
55 | .type = IRDA_TEKRAM_DONGLE, | |
56 | .open = tekram_open, | |
57 | .close = tekram_close, | |
58 | .reset = tekram_reset, | |
59 | .set_speed = tekram_change_speed, | |
60 | }; | |
61 | ||
62 | static int __init tekram_sir_init(void) | |
63 | { | |
64 | if (tekram_delay < 1 || tekram_delay > 500) | |
65 | tekram_delay = 200; | |
66 | IRDA_DEBUG(1, "%s - using %d ms delay\n", | |
67 | tekram.driver_name, tekram_delay); | |
68 | return irda_register_dongle(&tekram); | |
69 | } | |
70 | ||
71 | static void __exit tekram_sir_cleanup(void) | |
72 | { | |
73 | irda_unregister_dongle(&tekram); | |
74 | } | |
75 | ||
76 | static int tekram_open(struct sir_dev *dev) | |
77 | { | |
78 | struct qos_info *qos = &dev->qos; | |
79 | ||
80 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__); | |
81 | ||
82 | sirdev_set_dtr_rts(dev, TRUE, TRUE); | |
83 | ||
84 | qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200; | |
85 | qos->min_turn_time.bits = 0x01; /* Needs at least 10 ms */ | |
86 | irda_qos_bits_to_value(qos); | |
87 | ||
88 | /* irda thread waits 50 msec for power settling */ | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
93 | static int tekram_close(struct sir_dev *dev) | |
94 | { | |
95 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__); | |
96 | ||
97 | /* Power off dongle */ | |
98 | sirdev_set_dtr_rts(dev, FALSE, FALSE); | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | /* | |
104 | * Function tekram_change_speed (dev, state, speed) | |
105 | * | |
106 | * Set the speed for the Tekram IRMate 210 type dongle. Warning, this | |
107 | * function must be called with a process context! | |
108 | * | |
109 | * Algorithm | |
110 | * 1. clear DTR | |
111 | * 2. set RTS, and wait at least 7 us | |
112 | * 3. send Control Byte to the IR-210 through TXD to set new baud rate | |
113 | * wait until the stop bit of Control Byte is sent (for 9600 baud rate, | |
114 | * it takes about 100 msec) | |
115 | * | |
116 | * [oops, why 100 msec? sending 1 byte (10 bits) takes 1.05 msec | |
117 | * - is this probably to compensate for delays in tty layer?] | |
118 | * | |
119 | * 5. clear RTS (return to NORMAL Operation) | |
120 | * 6. wait at least 50 us, new setting (baud rate, etc) takes effect here | |
121 | * after | |
122 | */ | |
123 | ||
124 | #define TEKRAM_STATE_WAIT_SPEED (SIRDEV_STATE_DONGLE_SPEED + 1) | |
125 | ||
126 | static int tekram_change_speed(struct sir_dev *dev, unsigned speed) | |
127 | { | |
128 | unsigned state = dev->fsm.substate; | |
129 | unsigned delay = 0; | |
130 | u8 byte; | |
131 | static int ret = 0; | |
132 | ||
133 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__); | |
134 | ||
135 | switch(state) { | |
136 | case SIRDEV_STATE_DONGLE_SPEED: | |
137 | ||
138 | switch (speed) { | |
139 | default: | |
140 | speed = 9600; | |
141 | ret = -EINVAL; | |
142 | /* fall thru */ | |
143 | case 9600: | |
144 | byte = TEKRAM_PW|TEKRAM_9600; | |
145 | break; | |
146 | case 19200: | |
147 | byte = TEKRAM_PW|TEKRAM_19200; | |
148 | break; | |
149 | case 38400: | |
150 | byte = TEKRAM_PW|TEKRAM_38400; | |
151 | break; | |
152 | case 57600: | |
153 | byte = TEKRAM_PW|TEKRAM_57600; | |
154 | break; | |
155 | case 115200: | |
156 | byte = TEKRAM_115200; | |
157 | break; | |
158 | } | |
159 | ||
160 | /* Set DTR, Clear RTS */ | |
161 | sirdev_set_dtr_rts(dev, TRUE, FALSE); | |
162 | ||
163 | /* Wait at least 7us */ | |
164 | udelay(14); | |
165 | ||
166 | /* Write control byte */ | |
167 | sirdev_raw_write(dev, &byte, 1); | |
168 | ||
169 | dev->speed = speed; | |
170 | ||
171 | state = TEKRAM_STATE_WAIT_SPEED; | |
172 | delay = tekram_delay; | |
173 | break; | |
174 | ||
175 | case TEKRAM_STATE_WAIT_SPEED: | |
176 | /* Set DTR, Set RTS */ | |
177 | sirdev_set_dtr_rts(dev, TRUE, TRUE); | |
178 | udelay(50); | |
179 | break; | |
180 | ||
181 | default: | |
182 | IRDA_ERROR("%s - undefined state %d\n", __FUNCTION__, state); | |
183 | ret = -EINVAL; | |
184 | break; | |
185 | } | |
186 | ||
187 | dev->fsm.substate = state; | |
188 | return (delay > 0) ? delay : ret; | |
189 | } | |
190 | ||
191 | /* | |
192 | * Function tekram_reset (driver) | |
193 | * | |
194 | * This function resets the tekram dongle. Warning, this function | |
195 | * must be called with a process context!! | |
196 | * | |
197 | * Algorithm: | |
198 | * 0. Clear RTS and DTR, and wait 50 ms (power off the IR-210 ) | |
199 | * 1. clear RTS | |
200 | * 2. set DTR, and wait at least 1 ms | |
201 | * 3. clear DTR to SPACE state, wait at least 50 us for further | |
202 | * operation | |
203 | */ | |
204 | ||
205 | static int tekram_reset(struct sir_dev *dev) | |
206 | { | |
207 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__); | |
208 | ||
209 | /* Clear DTR, Set RTS */ | |
210 | sirdev_set_dtr_rts(dev, FALSE, TRUE); | |
211 | ||
212 | /* Should sleep 1 ms */ | |
213 | msleep(1); | |
214 | ||
215 | /* Set DTR, Set RTS */ | |
216 | sirdev_set_dtr_rts(dev, TRUE, TRUE); | |
217 | ||
218 | /* Wait at least 50 us */ | |
219 | udelay(75); | |
220 | ||
221 | dev->speed = 9600; | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); | |
227 | MODULE_DESCRIPTION("Tekram IrMate IR-210B dongle driver"); | |
228 | MODULE_LICENSE("GPL"); | |
229 | MODULE_ALIAS("irda-dongle-0"); /* IRDA_TEKRAM_DONGLE */ | |
230 | ||
231 | module_init(tekram_sir_init); | |
232 | module_exit(tekram_sir_cleanup); |