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1 | /********************************************************************* |
2 | * | |
3 | * Filename: tekram.c | |
4 | * Version: 1.2 | |
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: Fri Dec 17 09:13:09 1999 | |
10 | * Modified by: Dag Brattli <dagb@cs.uit.no> | |
11 | * | |
12 | * Copyright (c) 1998-1999 Dag Brattli, All Rights Reserved. | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License as | |
16 | * published by the Free Software Foundation; either version 2 of | |
17 | * the License, or (at your option) any later version. | |
18 | * | |
96de0e25 | 19 | * Neither Dag Brattli nor University of Tromsø admit liability nor |
1da177e4 LT |
20 | * provide warranty for any of this software. This material is |
21 | * provided "AS-IS" and at no charge. | |
22 | * | |
23 | ********************************************************************/ | |
24 | ||
25 | #include <linux/module.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/tty.h> | |
28 | #include <linux/init.h> | |
29 | ||
30 | #include <net/irda/irda.h> | |
31 | #include <net/irda/irda_device.h> | |
32 | ||
33 | static void tekram_open(dongle_t *self, struct qos_info *qos); | |
34 | static void tekram_close(dongle_t *self); | |
35 | static int tekram_change_speed(struct irda_task *task); | |
36 | static int tekram_reset(struct irda_task *task); | |
37 | ||
38 | #define TEKRAM_115200 0x00 | |
39 | #define TEKRAM_57600 0x01 | |
40 | #define TEKRAM_38400 0x02 | |
41 | #define TEKRAM_19200 0x03 | |
42 | #define TEKRAM_9600 0x04 | |
43 | ||
44 | #define TEKRAM_PW 0x10 /* Pulse select bit */ | |
45 | ||
46 | static struct dongle_reg dongle = { | |
47 | .type = IRDA_TEKRAM_DONGLE, | |
48 | .open = tekram_open, | |
49 | .close = tekram_close, | |
50 | .reset = tekram_reset, | |
51 | .change_speed = tekram_change_speed, | |
52 | .owner = THIS_MODULE, | |
53 | }; | |
54 | ||
55 | static int __init tekram_init(void) | |
56 | { | |
57 | return irda_device_register_dongle(&dongle); | |
58 | } | |
59 | ||
60 | static void __exit tekram_cleanup(void) | |
61 | { | |
62 | irda_device_unregister_dongle(&dongle); | |
63 | } | |
64 | ||
65 | static void tekram_open(dongle_t *self, struct qos_info *qos) | |
66 | { | |
67 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); | |
68 | ||
69 | qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200; | |
70 | qos->min_turn_time.bits = 0x01; /* Needs at least 10 ms */ | |
71 | irda_qos_bits_to_value(qos); | |
72 | } | |
73 | ||
74 | static void tekram_close(dongle_t *self) | |
75 | { | |
76 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); | |
77 | ||
78 | /* Power off dongle */ | |
79 | self->set_dtr_rts(self->dev, FALSE, FALSE); | |
80 | ||
81 | if (self->reset_task) | |
82 | irda_task_delete(self->reset_task); | |
83 | if (self->speed_task) | |
84 | irda_task_delete(self->speed_task); | |
85 | } | |
86 | ||
87 | /* | |
88 | * Function tekram_change_speed (dev, state, speed) | |
89 | * | |
90 | * Set the speed for the Tekram IRMate 210 type dongle. Warning, this | |
91 | * function must be called with a process context! | |
92 | * | |
93 | * Algorithm | |
94 | * 1. clear DTR | |
95 | * 2. set RTS, and wait at least 7 us | |
96 | * 3. send Control Byte to the IR-210 through TXD to set new baud rate | |
97 | * wait until the stop bit of Control Byte is sent (for 9600 baud rate, | |
98 | * it takes about 100 msec) | |
99 | * 5. clear RTS (return to NORMAL Operation) | |
100 | * 6. wait at least 50 us, new setting (baud rate, etc) takes effect here | |
101 | * after | |
102 | */ | |
103 | static int tekram_change_speed(struct irda_task *task) | |
104 | { | |
105 | dongle_t *self = (dongle_t *) task->instance; | |
106 | __u32 speed = (__u32) task->param; | |
107 | __u8 byte; | |
108 | int ret = 0; | |
109 | ||
110 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); | |
111 | ||
112 | IRDA_ASSERT(task != NULL, return -1;); | |
113 | ||
114 | if (self->speed_task && self->speed_task != task) { | |
115 | IRDA_DEBUG(0, "%s(), busy!\n", __FUNCTION__ ); | |
116 | return msecs_to_jiffies(10); | |
117 | } else | |
118 | self->speed_task = task; | |
119 | ||
120 | switch (speed) { | |
121 | default: | |
122 | case 9600: | |
123 | byte = TEKRAM_PW|TEKRAM_9600; | |
124 | break; | |
125 | case 19200: | |
126 | byte = TEKRAM_PW|TEKRAM_19200; | |
127 | break; | |
128 | case 38400: | |
129 | byte = TEKRAM_PW|TEKRAM_38400; | |
130 | break; | |
131 | case 57600: | |
132 | byte = TEKRAM_PW|TEKRAM_57600; | |
133 | break; | |
134 | case 115200: | |
135 | byte = TEKRAM_115200; | |
136 | break; | |
137 | } | |
138 | ||
139 | switch (task->state) { | |
140 | case IRDA_TASK_INIT: | |
141 | case IRDA_TASK_CHILD_INIT: | |
142 | /* | |
143 | * Need to reset the dongle and go to 9600 bps before | |
144 | * programming | |
145 | */ | |
146 | if (irda_task_execute(self, tekram_reset, NULL, task, | |
147 | (void *) speed)) | |
148 | { | |
149 | /* Dongle need more time to reset */ | |
150 | irda_task_next_state(task, IRDA_TASK_CHILD_WAIT); | |
151 | ||
152 | /* Give reset 1 sec to finish */ | |
153 | ret = msecs_to_jiffies(1000); | |
154 | } else | |
155 | irda_task_next_state(task, IRDA_TASK_CHILD_DONE); | |
156 | break; | |
157 | case IRDA_TASK_CHILD_WAIT: | |
158 | IRDA_WARNING("%s(), resetting dongle timed out!\n", | |
159 | __FUNCTION__); | |
160 | ret = -1; | |
161 | break; | |
162 | case IRDA_TASK_CHILD_DONE: | |
163 | /* Set DTR, Clear RTS */ | |
164 | self->set_dtr_rts(self->dev, TRUE, FALSE); | |
165 | ||
166 | /* Wait at least 7us */ | |
167 | udelay(14); | |
168 | ||
169 | /* Write control byte */ | |
170 | self->write(self->dev, &byte, 1); | |
171 | ||
172 | irda_task_next_state(task, IRDA_TASK_WAIT); | |
173 | ||
174 | /* Wait at least 100 ms */ | |
175 | ret = msecs_to_jiffies(150); | |
176 | break; | |
177 | case IRDA_TASK_WAIT: | |
178 | /* Set DTR, Set RTS */ | |
179 | self->set_dtr_rts(self->dev, TRUE, TRUE); | |
180 | ||
181 | irda_task_next_state(task, IRDA_TASK_DONE); | |
182 | self->speed_task = NULL; | |
183 | break; | |
184 | default: | |
185 | IRDA_ERROR("%s(), unknown state %d\n", | |
186 | __FUNCTION__, task->state); | |
187 | irda_task_next_state(task, IRDA_TASK_DONE); | |
188 | self->speed_task = NULL; | |
189 | ret = -1; | |
190 | break; | |
191 | } | |
192 | return ret; | |
193 | } | |
194 | ||
195 | /* | |
196 | * Function tekram_reset (driver) | |
197 | * | |
198 | * This function resets the tekram dongle. Warning, this function | |
199 | * must be called with a process context!! | |
200 | * | |
201 | * Algorithm: | |
202 | * 0. Clear RTS and DTR, and wait 50 ms (power off the IR-210 ) | |
203 | * 1. clear RTS | |
204 | * 2. set DTR, and wait at least 1 ms | |
205 | * 3. clear DTR to SPACE state, wait at least 50 us for further | |
206 | * operation | |
207 | */ | |
208 | int tekram_reset(struct irda_task *task) | |
209 | { | |
210 | dongle_t *self = (dongle_t *) task->instance; | |
211 | int ret = 0; | |
212 | ||
213 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); | |
214 | ||
215 | IRDA_ASSERT(task != NULL, return -1;); | |
216 | ||
217 | if (self->reset_task && self->reset_task != task) { | |
218 | IRDA_DEBUG(0, "%s(), busy!\n", __FUNCTION__ ); | |
219 | return msecs_to_jiffies(10); | |
220 | } else | |
221 | self->reset_task = task; | |
222 | ||
223 | /* Power off dongle */ | |
224 | //self->set_dtr_rts(self->dev, FALSE, FALSE); | |
225 | self->set_dtr_rts(self->dev, TRUE, TRUE); | |
226 | ||
227 | switch (task->state) { | |
228 | case IRDA_TASK_INIT: | |
229 | irda_task_next_state(task, IRDA_TASK_WAIT1); | |
230 | ||
231 | /* Sleep 50 ms */ | |
232 | ret = msecs_to_jiffies(50); | |
233 | break; | |
234 | case IRDA_TASK_WAIT1: | |
235 | /* Clear DTR, Set RTS */ | |
236 | self->set_dtr_rts(self->dev, FALSE, TRUE); | |
237 | ||
238 | irda_task_next_state(task, IRDA_TASK_WAIT2); | |
239 | ||
240 | /* Should sleep 1 ms */ | |
241 | ret = msecs_to_jiffies(1); | |
242 | break; | |
243 | case IRDA_TASK_WAIT2: | |
244 | /* Set DTR, Set RTS */ | |
245 | self->set_dtr_rts(self->dev, TRUE, TRUE); | |
246 | ||
247 | /* Wait at least 50 us */ | |
248 | udelay(75); | |
249 | ||
250 | irda_task_next_state(task, IRDA_TASK_DONE); | |
251 | self->reset_task = NULL; | |
252 | break; | |
253 | default: | |
254 | IRDA_ERROR("%s(), unknown state %d\n", | |
255 | __FUNCTION__, task->state); | |
256 | irda_task_next_state(task, IRDA_TASK_DONE); | |
257 | self->reset_task = NULL; | |
258 | ret = -1; | |
259 | } | |
260 | return ret; | |
261 | } | |
262 | ||
263 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); | |
264 | MODULE_DESCRIPTION("Tekram IrMate IR-210B dongle driver"); | |
265 | MODULE_LICENSE("GPL"); | |
266 | MODULE_ALIAS("irda-dongle-0"); /* IRDA_TEKRAM_DONGLE */ | |
267 | ||
268 | /* | |
269 | * Function init_module (void) | |
270 | * | |
271 | * Initialize Tekram module | |
272 | * | |
273 | */ | |
274 | module_init(tekram_init); | |
275 | ||
276 | /* | |
277 | * Function cleanup_module (void) | |
278 | * | |
279 | * Cleanup Tekram module | |
280 | * | |
281 | */ | |
282 | module_exit(tekram_cleanup); |