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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; | |
955a9d20 JP |
66 | pr_debug("%s - using %d ms delay\n", |
67 | tekram.driver_name, tekram_delay); | |
1da177e4 LT |
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 | ||
1da177e4 LT |
80 | sirdev_set_dtr_rts(dev, TRUE, TRUE); |
81 | ||
82 | qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200; | |
83 | qos->min_turn_time.bits = 0x01; /* Needs at least 10 ms */ | |
84 | irda_qos_bits_to_value(qos); | |
85 | ||
86 | /* irda thread waits 50 msec for power settling */ | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | static int tekram_close(struct sir_dev *dev) | |
92 | { | |
1da177e4 LT |
93 | /* Power off dongle */ |
94 | sirdev_set_dtr_rts(dev, FALSE, FALSE); | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | /* | |
100 | * Function tekram_change_speed (dev, state, speed) | |
101 | * | |
102 | * Set the speed for the Tekram IRMate 210 type dongle. Warning, this | |
103 | * function must be called with a process context! | |
104 | * | |
105 | * Algorithm | |
106 | * 1. clear DTR | |
107 | * 2. set RTS, and wait at least 7 us | |
108 | * 3. send Control Byte to the IR-210 through TXD to set new baud rate | |
109 | * wait until the stop bit of Control Byte is sent (for 9600 baud rate, | |
110 | * it takes about 100 msec) | |
111 | * | |
112 | * [oops, why 100 msec? sending 1 byte (10 bits) takes 1.05 msec | |
113 | * - is this probably to compensate for delays in tty layer?] | |
114 | * | |
115 | * 5. clear RTS (return to NORMAL Operation) | |
116 | * 6. wait at least 50 us, new setting (baud rate, etc) takes effect here | |
117 | * after | |
118 | */ | |
119 | ||
120 | #define TEKRAM_STATE_WAIT_SPEED (SIRDEV_STATE_DONGLE_SPEED + 1) | |
121 | ||
122 | static int tekram_change_speed(struct sir_dev *dev, unsigned speed) | |
123 | { | |
124 | unsigned state = dev->fsm.substate; | |
125 | unsigned delay = 0; | |
126 | u8 byte; | |
127 | static int ret = 0; | |
128 | ||
1da177e4 LT |
129 | switch(state) { |
130 | case SIRDEV_STATE_DONGLE_SPEED: | |
131 | ||
132 | switch (speed) { | |
133 | default: | |
134 | speed = 9600; | |
135 | ret = -EINVAL; | |
136 | /* fall thru */ | |
137 | case 9600: | |
138 | byte = TEKRAM_PW|TEKRAM_9600; | |
139 | break; | |
140 | case 19200: | |
141 | byte = TEKRAM_PW|TEKRAM_19200; | |
142 | break; | |
143 | case 38400: | |
144 | byte = TEKRAM_PW|TEKRAM_38400; | |
145 | break; | |
146 | case 57600: | |
147 | byte = TEKRAM_PW|TEKRAM_57600; | |
148 | break; | |
149 | case 115200: | |
150 | byte = TEKRAM_115200; | |
151 | break; | |
152 | } | |
153 | ||
154 | /* Set DTR, Clear RTS */ | |
155 | sirdev_set_dtr_rts(dev, TRUE, FALSE); | |
156 | ||
157 | /* Wait at least 7us */ | |
158 | udelay(14); | |
159 | ||
160 | /* Write control byte */ | |
161 | sirdev_raw_write(dev, &byte, 1); | |
162 | ||
163 | dev->speed = speed; | |
164 | ||
165 | state = TEKRAM_STATE_WAIT_SPEED; | |
166 | delay = tekram_delay; | |
167 | break; | |
168 | ||
169 | case TEKRAM_STATE_WAIT_SPEED: | |
170 | /* Set DTR, Set RTS */ | |
171 | sirdev_set_dtr_rts(dev, TRUE, TRUE); | |
172 | udelay(50); | |
173 | break; | |
174 | ||
175 | default: | |
6c91023d JP |
176 | net_err_ratelimited("%s - undefined state %d\n", |
177 | __func__, state); | |
1da177e4 LT |
178 | ret = -EINVAL; |
179 | break; | |
180 | } | |
181 | ||
182 | dev->fsm.substate = state; | |
183 | return (delay > 0) ? delay : ret; | |
184 | } | |
185 | ||
186 | /* | |
187 | * Function tekram_reset (driver) | |
188 | * | |
189 | * This function resets the tekram dongle. Warning, this function | |
190 | * must be called with a process context!! | |
191 | * | |
192 | * Algorithm: | |
193 | * 0. Clear RTS and DTR, and wait 50 ms (power off the IR-210 ) | |
194 | * 1. clear RTS | |
195 | * 2. set DTR, and wait at least 1 ms | |
196 | * 3. clear DTR to SPACE state, wait at least 50 us for further | |
197 | * operation | |
198 | */ | |
199 | ||
200 | static int tekram_reset(struct sir_dev *dev) | |
201 | { | |
1da177e4 LT |
202 | /* Clear DTR, Set RTS */ |
203 | sirdev_set_dtr_rts(dev, FALSE, TRUE); | |
204 | ||
205 | /* Should sleep 1 ms */ | |
206 | msleep(1); | |
207 | ||
208 | /* Set DTR, Set RTS */ | |
209 | sirdev_set_dtr_rts(dev, TRUE, TRUE); | |
210 | ||
211 | /* Wait at least 50 us */ | |
212 | udelay(75); | |
213 | ||
214 | dev->speed = 9600; | |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
219 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); | |
220 | MODULE_DESCRIPTION("Tekram IrMate IR-210B dongle driver"); | |
221 | MODULE_LICENSE("GPL"); | |
222 | MODULE_ALIAS("irda-dongle-0"); /* IRDA_TEKRAM_DONGLE */ | |
223 | ||
224 | module_init(tekram_sir_init); | |
225 | module_exit(tekram_sir_cleanup); |