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Diffstat (limited to 'drivers/net/irda/actisys.c')
-rw-r--r-- | drivers/net/irda/actisys.c | 288 |
1 files changed, 288 insertions, 0 deletions
diff --git a/drivers/net/irda/actisys.c b/drivers/net/irda/actisys.c new file mode 100644 index 000000000000..b2e31f4a384c --- /dev/null +++ b/drivers/net/irda/actisys.c | |||
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1 | /********************************************************************* | ||
2 | * | ||
3 | * Filename: actisys.c | ||
4 | * Version: 1.0 | ||
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 | * Created at: Wed Oct 21 20:02:35 1998 | ||
11 | * Modified at: Fri Dec 17 09:10:43 1999 | ||
12 | * Modified by: Dag Brattli <dagb@cs.uit.no> | ||
13 | * | ||
14 | * Copyright (c) 1998-1999 Dag Brattli, All Rights Reserved. | ||
15 | * Copyright (c) 1999 Jean Tourrilhes | ||
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 | * Neither Dag Brattli nor University of Tromsų admit liability nor | ||
23 | * provide warranty for any of this software. This material is | ||
24 | * provided "AS-IS" and at no charge. | ||
25 | * | ||
26 | ********************************************************************/ | ||
27 | |||
28 | /* | ||
29 | * Changelog | ||
30 | * | ||
31 | * 0.8 -> 0.9999 - Jean | ||
32 | * o New initialisation procedure : much safer and correct | ||
33 | * o New procedure the change speed : much faster and simpler | ||
34 | * o Other cleanups & comments | ||
35 | * Thanks to Lichen Wang @ Actisys for his excellent help... | ||
36 | */ | ||
37 | |||
38 | #include <linux/module.h> | ||
39 | #include <linux/delay.h> | ||
40 | #include <linux/tty.h> | ||
41 | #include <linux/init.h> | ||
42 | |||
43 | #include <net/irda/irda.h> | ||
44 | #include <net/irda/irda_device.h> | ||
45 | |||
46 | /* | ||
47 | * Define the timing of the pulses we send to the dongle (to reset it, and | ||
48 | * to toggle speeds). Basically, the limit here is the propagation speed of | ||
49 | * the signals through the serial port, the dongle being much faster. Any | ||
50 | * serial port support 115 kb/s, so we are sure that pulses 8.5 us wide can | ||
51 | * go through cleanly . If you are on the wild side, you can try to lower | ||
52 | * this value (Actisys recommended me 2 us, and 0 us work for me on a P233!) | ||
53 | */ | ||
54 | #define MIN_DELAY 10 /* 10 us to be on the conservative side */ | ||
55 | |||
56 | static int actisys_change_speed(struct irda_task *task); | ||
57 | static int actisys_reset(struct irda_task *task); | ||
58 | static void actisys_open(dongle_t *self, struct qos_info *qos); | ||
59 | static void actisys_close(dongle_t *self); | ||
60 | |||
61 | /* These are the baudrates supported, in the order available */ | ||
62 | /* Note : the 220L doesn't support 38400, but we will fix that below */ | ||
63 | static __u32 baud_rates[] = { 9600, 19200, 57600, 115200, 38400 }; | ||
64 | #define MAX_SPEEDS 5 | ||
65 | |||
66 | static struct dongle_reg dongle = { | ||
67 | .type = IRDA_ACTISYS_DONGLE, | ||
68 | .open = actisys_open, | ||
69 | .close = actisys_close, | ||
70 | .reset = actisys_reset, | ||
71 | .change_speed = actisys_change_speed, | ||
72 | .owner = THIS_MODULE, | ||
73 | }; | ||
74 | |||
75 | static struct dongle_reg dongle_plus = { | ||
76 | .type = IRDA_ACTISYS_PLUS_DONGLE, | ||
77 | .open = actisys_open, | ||
78 | .close = actisys_close, | ||
79 | .reset = actisys_reset, | ||
80 | .change_speed = actisys_change_speed, | ||
81 | .owner = THIS_MODULE, | ||
82 | }; | ||
83 | |||
84 | /* | ||
85 | * Function actisys_change_speed (task) | ||
86 | * | ||
87 | * There is two model of Actisys dongle we are dealing with, | ||
88 | * the 220L and 220L+. At this point, only irattach knows with | ||
89 | * kind the user has requested (it was an argument on irattach | ||
90 | * command line). | ||
91 | * So, we register a dongle of each sort and let irattach | ||
92 | * pick the right one... | ||
93 | */ | ||
94 | static int __init actisys_init(void) | ||
95 | { | ||
96 | int ret; | ||
97 | |||
98 | /* First, register an Actisys 220L dongle */ | ||
99 | ret = irda_device_register_dongle(&dongle); | ||
100 | if (ret < 0) | ||
101 | return ret; | ||
102 | /* Now, register an Actisys 220L+ dongle */ | ||
103 | ret = irda_device_register_dongle(&dongle_plus); | ||
104 | if (ret < 0) { | ||
105 | irda_device_unregister_dongle(&dongle); | ||
106 | return ret; | ||
107 | } | ||
108 | return 0; | ||
109 | } | ||
110 | |||
111 | static void __exit actisys_cleanup(void) | ||
112 | { | ||
113 | /* We have to remove both dongles */ | ||
114 | irda_device_unregister_dongle(&dongle); | ||
115 | irda_device_unregister_dongle(&dongle_plus); | ||
116 | } | ||
117 | |||
118 | static void actisys_open(dongle_t *self, struct qos_info *qos) | ||
119 | { | ||
120 | /* Power on the dongle */ | ||
121 | self->set_dtr_rts(self->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 (self->issue->type == IRDA_ACTISYS_DONGLE) | ||
128 | qos->baud_rate.bits &= ~IR_38400; | ||
129 | |||
130 | qos->min_turn_time.bits = 0x7f; /* Needs 0.01 ms */ | ||
131 | } | ||
132 | |||
133 | static void actisys_close(dongle_t *self) | ||
134 | { | ||
135 | /* Power off the dongle */ | ||
136 | self->set_dtr_rts(self->dev, FALSE, FALSE); | ||
137 | } | ||
138 | |||
139 | /* | ||
140 | * Function actisys_change_speed (task) | ||
141 | * | ||
142 | * Change speed of the ACTiSYS IR-220L and IR-220L+ type IrDA dongles. | ||
143 | * To cycle through the available baud rates, pulse RTS low for a few us. | ||
144 | * | ||
145 | * First, we reset the dongle to always start from a known state. | ||
146 | * Then, we cycle through the speeds by pulsing RTS low and then up. | ||
147 | * The dongle allow us to pulse quite fast, se we can set speed in one go, | ||
148 | * which is must faster ( < 100 us) and less complex than what is found | ||
149 | * in some other dongle drivers... | ||
150 | * Note that even if the new speed is the same as the current speed, | ||
151 | * we reassert the speed. This make sure that things are all right, | ||
152 | * and it's fast anyway... | ||
153 | * By the way, this function will work for both type of dongles, | ||
154 | * because the additional speed is at the end of the sequence... | ||
155 | */ | ||
156 | static int actisys_change_speed(struct irda_task *task) | ||
157 | { | ||
158 | dongle_t *self = (dongle_t *) task->instance; | ||
159 | __u32 speed = (__u32) task->param; /* Target speed */ | ||
160 | int ret = 0; | ||
161 | int i = 0; | ||
162 | |||
163 | IRDA_DEBUG(4, "%s(), speed=%d (was %d)\n", __FUNCTION__, speed, | ||
164 | self->speed); | ||
165 | |||
166 | /* Go to a known state by reseting the dongle */ | ||
167 | |||
168 | /* Reset the dongle : set DTR low for 10 us */ | ||
169 | self->set_dtr_rts(self->dev, FALSE, TRUE); | ||
170 | udelay(MIN_DELAY); | ||
171 | |||
172 | /* Go back to normal mode (we are now at 9600 b/s) */ | ||
173 | self->set_dtr_rts(self->dev, TRUE, TRUE); | ||
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 | self->speed = baud_rates[i]; | ||
182 | break; | ||
183 | } | ||
184 | /* Make sure previous pulse is finished */ | ||
185 | udelay(MIN_DELAY); | ||
186 | |||
187 | /* Set RTS low for 10 us */ | ||
188 | self->set_dtr_rts(self->dev, TRUE, FALSE); | ||
189 | udelay(MIN_DELAY); | ||
190 | |||
191 | /* Set RTS high for 10 us */ | ||
192 | self->set_dtr_rts(self->dev, TRUE, TRUE); | ||
193 | } | ||
194 | |||
195 | /* Check if life is sweet... */ | ||
196 | if (i >= MAX_SPEEDS) | ||
197 | ret = -1; /* This should not happen */ | ||
198 | |||
199 | /* Basta lavoro, on se casse d'ici... */ | ||
200 | irda_task_next_state(task, IRDA_TASK_DONE); | ||
201 | |||
202 | return ret; | ||
203 | } | ||
204 | |||
205 | /* | ||
206 | * Function actisys_reset (task) | ||
207 | * | ||
208 | * Reset the Actisys type dongle. Warning, this function must only be | ||
209 | * called with a process context! | ||
210 | * | ||
211 | * We need to do two things in this function : | ||
212 | * o first make sure that the dongle is in a state where it can operate | ||
213 | * o second put the dongle in a know state | ||
214 | * | ||
215 | * The dongle is powered of the RTS and DTR lines. In the dongle, there | ||
216 | * is a big capacitor to accommodate the current spikes. This capacitor | ||
217 | * takes a least 50 ms to be charged. In theory, the Bios set those lines | ||
218 | * up, so by the time we arrive here we should be set. It doesn't hurt | ||
219 | * to be on the conservative side, so we will wait... | ||
220 | * Then, we set the speed to 9600 b/s to get in a known state (see in | ||
221 | * change_speed for details). It is needed because the IrDA stack | ||
222 | * has tried to set the speed immediately after our first return, | ||
223 | * so before we can be sure the dongle is up and running. | ||
224 | */ | ||
225 | static int actisys_reset(struct irda_task *task) | ||
226 | { | ||
227 | dongle_t *self = (dongle_t *) task->instance; | ||
228 | int ret = 0; | ||
229 | |||
230 | IRDA_ASSERT(task != NULL, return -1;); | ||
231 | |||
232 | self->reset_task = task; | ||
233 | |||
234 | switch (task->state) { | ||
235 | case IRDA_TASK_INIT: | ||
236 | /* Set both DTR & RTS to power up the dongle */ | ||
237 | /* In theory redundant with power up in actisys_open() */ | ||
238 | self->set_dtr_rts(self->dev, TRUE, TRUE); | ||
239 | |||
240 | /* Sleep 50 ms to make sure capacitor is charged */ | ||
241 | ret = msecs_to_jiffies(50); | ||
242 | irda_task_next_state(task, IRDA_TASK_WAIT); | ||
243 | break; | ||
244 | case IRDA_TASK_WAIT: | ||
245 | /* Reset the dongle : set DTR low for 10 us */ | ||
246 | self->set_dtr_rts(self->dev, FALSE, TRUE); | ||
247 | udelay(MIN_DELAY); | ||
248 | |||
249 | /* Go back to normal mode */ | ||
250 | self->set_dtr_rts(self->dev, TRUE, TRUE); | ||
251 | |||
252 | irda_task_next_state(task, IRDA_TASK_DONE); | ||
253 | self->reset_task = NULL; | ||
254 | self->speed = 9600; /* That's the default */ | ||
255 | break; | ||
256 | default: | ||
257 | IRDA_ERROR("%s(), unknown state %d\n", | ||
258 | __FUNCTION__, task->state); | ||
259 | irda_task_next_state(task, IRDA_TASK_DONE); | ||
260 | self->reset_task = NULL; | ||
261 | ret = -1; | ||
262 | break; | ||
263 | } | ||
264 | return ret; | ||
265 | } | ||
266 | |||
267 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no> - Jean Tourrilhes <jt@hpl.hp.com>"); | ||
268 | MODULE_DESCRIPTION("ACTiSYS IR-220L and IR-220L+ dongle driver"); | ||
269 | MODULE_LICENSE("GPL"); | ||
270 | MODULE_ALIAS("irda-dongle-2"); /* IRDA_ACTISYS_DONGLE */ | ||
271 | MODULE_ALIAS("irda-dongle-3"); /* IRDA_ACTISYS_PLUS_DONGLE */ | ||
272 | |||
273 | |||
274 | /* | ||
275 | * Function init_module (void) | ||
276 | * | ||
277 | * Initialize Actisys module | ||
278 | * | ||
279 | */ | ||
280 | module_init(actisys_init); | ||
281 | |||
282 | /* | ||
283 | * Function cleanup_module (void) | ||
284 | * | ||
285 | * Cleanup Actisys module | ||
286 | * | ||
287 | */ | ||
288 | module_exit(actisys_cleanup); | ||