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1 | /********************************************************************* |
2 | * | |
3 | * Filename: actisys.c | |
4 | * Version: 1.1 | |
5 | * Description: Implementation for the ACTiSYS IR-220L and IR-220L+ | |
6 | * dongles | |
7 | * Status: Beta. | |
8 | * Authors: Dag Brattli <dagb@cs.uit.no> (initially) | |
9 | * Jean Tourrilhes <jt@hpl.hp.com> (new version) | |
10 | * Martin Diehl <mad@mdiehl.de> (new version for sir_dev) | |
11 | * Created at: Wed Oct 21 20:02:35 1998 | |
12 | * Modified at: Sun Oct 27 22:02:13 2002 | |
13 | * Modified by: Martin Diehl <mad@mdiehl.de> | |
14 | * | |
15 | * Copyright (c) 1998-1999 Dag Brattli, All Rights Reserved. | |
16 | * Copyright (c) 1999 Jean Tourrilhes | |
17 | * Copyright (c) 2002 Martin Diehl | |
18 | * | |
19 | * This program is free software; you can redistribute it and/or | |
20 | * modify it under the terms of the GNU General Public License as | |
21 | * published by the Free Software Foundation; either version 2 of | |
22 | * the License, or (at your option) any later version. | |
23 | * | |
96de0e25 | 24 | * Neither Dag Brattli nor University of Tromsø admit liability nor |
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25 | * provide warranty for any of this software. This material is |
26 | * provided "AS-IS" and at no charge. | |
27 | * | |
28 | ********************************************************************/ | |
29 | ||
30 | /* | |
31 | * Changelog | |
32 | * | |
33 | * 0.8 -> 0.9999 - Jean | |
34 | * o New initialisation procedure : much safer and correct | |
35 | * o New procedure the change speed : much faster and simpler | |
36 | * o Other cleanups & comments | |
37 | * Thanks to Lichen Wang @ Actisys for his excellent help... | |
38 | * | |
39 | * 1.0 -> 1.1 - Martin Diehl | |
40 | * modified for new sir infrastructure | |
41 | */ | |
42 | ||
43 | #include <linux/module.h> | |
44 | #include <linux/delay.h> | |
45 | #include <linux/init.h> | |
46 | ||
47 | #include <net/irda/irda.h> | |
48 | ||
49 | #include "sir-dev.h" | |
50 | ||
51 | /* | |
52 | * Define the timing of the pulses we send to the dongle (to reset it, and | |
53 | * to toggle speeds). Basically, the limit here is the propagation speed of | |
54 | * the signals through the serial port, the dongle being much faster. Any | |
55 | * serial port support 115 kb/s, so we are sure that pulses 8.5 us wide can | |
56 | * go through cleanly . If you are on the wild side, you can try to lower | |
57 | * this value (Actisys recommended me 2 us, and 0 us work for me on a P233!) | |
58 | */ | |
59 | #define MIN_DELAY 10 /* 10 us to be on the conservative side */ | |
60 | ||
61 | static int actisys_open(struct sir_dev *); | |
62 | static int actisys_close(struct sir_dev *); | |
63 | static int actisys_change_speed(struct sir_dev *, unsigned); | |
64 | static int actisys_reset(struct sir_dev *); | |
65 | ||
66 | /* These are the baudrates supported, in the order available */ | |
67 | /* Note : the 220L doesn't support 38400, but we will fix that below */ | |
68 | static unsigned baud_rates[] = { 9600, 19200, 57600, 115200, 38400 }; | |
69 | ||
ff8ac609 | 70 | #define MAX_SPEEDS ARRAY_SIZE(baud_rates) |
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71 | |
72 | static struct dongle_driver act220l = { | |
73 | .owner = THIS_MODULE, | |
74 | .driver_name = "Actisys ACT-220L", | |
75 | .type = IRDA_ACTISYS_DONGLE, | |
76 | .open = actisys_open, | |
77 | .close = actisys_close, | |
78 | .reset = actisys_reset, | |
79 | .set_speed = actisys_change_speed, | |
80 | }; | |
81 | ||
82 | static struct dongle_driver act220l_plus = { | |
83 | .owner = THIS_MODULE, | |
84 | .driver_name = "Actisys ACT-220L+", | |
85 | .type = IRDA_ACTISYS_PLUS_DONGLE, | |
86 | .open = actisys_open, | |
87 | .close = actisys_close, | |
88 | .reset = actisys_reset, | |
89 | .set_speed = actisys_change_speed, | |
90 | }; | |
91 | ||
92 | static int __init actisys_sir_init(void) | |
93 | { | |
94 | int ret; | |
95 | ||
96 | /* First, register an Actisys 220L dongle */ | |
97 | ret = irda_register_dongle(&act220l); | |
98 | if (ret < 0) | |
99 | return ret; | |
100 | ||
101 | /* Now, register an Actisys 220L+ dongle */ | |
102 | ret = irda_register_dongle(&act220l_plus); | |
103 | if (ret < 0) { | |
104 | irda_unregister_dongle(&act220l); | |
105 | return ret; | |
106 | } | |
107 | return 0; | |
108 | } | |
109 | ||
110 | static void __exit actisys_sir_cleanup(void) | |
111 | { | |
112 | /* We have to remove both dongles */ | |
113 | irda_unregister_dongle(&act220l_plus); | |
114 | irda_unregister_dongle(&act220l); | |
115 | } | |
116 | ||
117 | static int actisys_open(struct sir_dev *dev) | |
118 | { | |
119 | struct qos_info *qos = &dev->qos; | |
120 | ||
121 | sirdev_set_dtr_rts(dev, TRUE, TRUE); | |
122 | ||
123 | /* Set the speeds we can accept */ | |
124 | qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200; | |
125 | ||
126 | /* Remove support for 38400 if this is not a 220L+ dongle */ | |
127 | if (dev->dongle_drv->type == IRDA_ACTISYS_DONGLE) | |
128 | qos->baud_rate.bits &= ~IR_38400; | |
129 | ||
130 | qos->min_turn_time.bits = 0x7f; /* Needs 0.01 ms */ | |
131 | irda_qos_bits_to_value(qos); | |
132 | ||
133 | /* irda thread waits 50 msec for power settling */ | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | static int actisys_close(struct sir_dev *dev) | |
139 | { | |
140 | /* Power off the dongle */ | |
141 | sirdev_set_dtr_rts(dev, FALSE, FALSE); | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
146 | /* | |
147 | * Function actisys_change_speed (task) | |
148 | * | |
149 | * Change speed of the ACTiSYS IR-220L and IR-220L+ type IrDA dongles. | |
150 | * To cycle through the available baud rates, pulse RTS low for a few us. | |
151 | * | |
152 | * First, we reset the dongle to always start from a known state. | |
153 | * Then, we cycle through the speeds by pulsing RTS low and then up. | |
154 | * The dongle allow us to pulse quite fast, se we can set speed in one go, | |
155 | * which is must faster ( < 100 us) and less complex than what is found | |
156 | * in some other dongle drivers... | |
157 | * Note that even if the new speed is the same as the current speed, | |
158 | * we reassert the speed. This make sure that things are all right, | |
159 | * and it's fast anyway... | |
160 | * By the way, this function will work for both type of dongles, | |
161 | * because the additional speed is at the end of the sequence... | |
162 | */ | |
163 | static int actisys_change_speed(struct sir_dev *dev, unsigned speed) | |
164 | { | |
165 | int ret = 0; | |
166 | int i = 0; | |
167 | ||
a97a6f10 | 168 | IRDA_DEBUG(4, "%s(), speed=%d (was %d)\n", __func__, |
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169 | speed, dev->speed); |
170 | ||
171 | /* dongle was already resetted from irda_request state machine, | |
172 | * we are in known state (dongle default) | |
173 | */ | |
174 | ||
175 | /* | |
176 | * Now, we can set the speed requested. Send RTS pulses until we | |
177 | * reach the target speed | |
178 | */ | |
179 | for (i = 0; i < MAX_SPEEDS; i++) { | |
180 | if (speed == baud_rates[i]) { | |
181 | dev->speed = speed; | |
182 | break; | |
183 | } | |
184 | /* Set RTS low for 10 us */ | |
185 | sirdev_set_dtr_rts(dev, TRUE, FALSE); | |
186 | udelay(MIN_DELAY); | |
187 | ||
188 | /* Set RTS high for 10 us */ | |
189 | sirdev_set_dtr_rts(dev, TRUE, TRUE); | |
190 | udelay(MIN_DELAY); | |
191 | } | |
192 | ||
193 | /* Check if life is sweet... */ | |
194 | if (i >= MAX_SPEEDS) { | |
195 | actisys_reset(dev); | |
196 | ret = -EINVAL; /* This should not happen */ | |
197 | } | |
198 | ||
199 | /* Basta lavoro, on se casse d'ici... */ | |
200 | return ret; | |
201 | } | |
202 | ||
203 | /* | |
204 | * Function actisys_reset (task) | |
205 | * | |
206 | * Reset the Actisys type dongle. Warning, this function must only be | |
207 | * called with a process context! | |
208 | * | |
209 | * We need to do two things in this function : | |
210 | * o first make sure that the dongle is in a state where it can operate | |
211 | * o second put the dongle in a know state | |
212 | * | |
213 | * The dongle is powered of the RTS and DTR lines. In the dongle, there | |
214 | * is a big capacitor to accommodate the current spikes. This capacitor | |
215 | * takes a least 50 ms to be charged. In theory, the Bios set those lines | |
216 | * up, so by the time we arrive here we should be set. It doesn't hurt | |
217 | * to be on the conservative side, so we will wait... | |
218 | * <Martin : move above comment to irda_config_fsm> | |
219 | * Then, we set the speed to 9600 b/s to get in a known state (see in | |
220 | * change_speed for details). It is needed because the IrDA stack | |
221 | * has tried to set the speed immediately after our first return, | |
222 | * so before we can be sure the dongle is up and running. | |
223 | */ | |
224 | ||
225 | static int actisys_reset(struct sir_dev *dev) | |
226 | { | |
227 | /* Reset the dongle : set DTR low for 10 us */ | |
228 | sirdev_set_dtr_rts(dev, FALSE, TRUE); | |
229 | udelay(MIN_DELAY); | |
230 | ||
231 | /* Go back to normal mode */ | |
232 | sirdev_set_dtr_rts(dev, TRUE, TRUE); | |
233 | ||
234 | dev->speed = 9600; /* That's the default */ | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no> - Jean Tourrilhes <jt@hpl.hp.com>"); | |
240 | MODULE_DESCRIPTION("ACTiSYS IR-220L and IR-220L+ dongle driver"); | |
241 | MODULE_LICENSE("GPL"); | |
242 | MODULE_ALIAS("irda-dongle-2"); /* IRDA_ACTISYS_DONGLE */ | |
243 | MODULE_ALIAS("irda-dongle-3"); /* IRDA_ACTISYS_PLUS_DONGLE */ | |
244 | ||
245 | module_init(actisys_sir_init); | |
246 | module_exit(actisys_sir_cleanup); |