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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
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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
33static void tekram_open(dongle_t *self, struct qos_info *qos);
34static void tekram_close(dongle_t *self);
35static int tekram_change_speed(struct irda_task *task);
36static 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
46static 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
55static int __init tekram_init(void)
56{
57 return irda_device_register_dongle(&dongle);
58}
59
60static void __exit tekram_cleanup(void)
61{
62 irda_device_unregister_dongle(&dongle);
63}
64
65static 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
74static 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 */
103static 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 */
208int 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
263MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
264MODULE_DESCRIPTION("Tekram IrMate IR-210B dongle driver");
265MODULE_LICENSE("GPL");
266MODULE_ALIAS("irda-dongle-0"); /* IRDA_TEKRAM_DONGLE */
267
268/*
269 * Function init_module (void)
270 *
271 * Initialize Tekram module
272 *
273 */
274module_init(tekram_init);
275
276/*
277 * Function cleanup_module (void)
278 *
279 * Cleanup Tekram module
280 *
281 */
282module_exit(tekram_cleanup);