Loading...
Note: File does not exist in v6.8.
1/*********************************************************************
2 *
3 * Filename: girbil.c
4 * Version: 1.2
5 * Description: Implementation for the Greenwich GIrBIL dongle
6 * Status: Experimental.
7 * Author: Dag Brattli <dagb@cs.uit.no>
8 * Created at: Sat Feb 6 21:02:33 1999
9 * Modified at: Fri Dec 17 09:13:20 1999
10 * Modified by: Dag Brattli <dagb@cs.uit.no>
11 *
12 * Copyright (c) 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 *
19 * Neither Dag Brattli nor University of Tromsø admit liability nor
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/init.h>
28
29#include <net/irda/irda.h>
30
31#include "sir-dev.h"
32
33static int girbil_reset(struct sir_dev *dev);
34static int girbil_open(struct sir_dev *dev);
35static int girbil_close(struct sir_dev *dev);
36static int girbil_change_speed(struct sir_dev *dev, unsigned speed);
37
38/* Control register 1 */
39#define GIRBIL_TXEN 0x01 /* Enable transmitter */
40#define GIRBIL_RXEN 0x02 /* Enable receiver */
41#define GIRBIL_ECAN 0x04 /* Cancel self emitted data */
42#define GIRBIL_ECHO 0x08 /* Echo control characters */
43
44/* LED Current Register (0x2) */
45#define GIRBIL_HIGH 0x20
46#define GIRBIL_MEDIUM 0x21
47#define GIRBIL_LOW 0x22
48
49/* Baud register (0x3) */
50#define GIRBIL_2400 0x30
51#define GIRBIL_4800 0x31
52#define GIRBIL_9600 0x32
53#define GIRBIL_19200 0x33
54#define GIRBIL_38400 0x34
55#define GIRBIL_57600 0x35
56#define GIRBIL_115200 0x36
57
58/* Mode register (0x4) */
59#define GIRBIL_IRDA 0x40
60#define GIRBIL_ASK 0x41
61
62/* Control register 2 (0x5) */
63#define GIRBIL_LOAD 0x51 /* Load the new baud rate value */
64
65static struct dongle_driver girbil = {
66 .owner = THIS_MODULE,
67 .driver_name = "Greenwich GIrBIL",
68 .type = IRDA_GIRBIL_DONGLE,
69 .open = girbil_open,
70 .close = girbil_close,
71 .reset = girbil_reset,
72 .set_speed = girbil_change_speed,
73};
74
75static int __init girbil_sir_init(void)
76{
77 return irda_register_dongle(&girbil);
78}
79
80static void __exit girbil_sir_cleanup(void)
81{
82 irda_unregister_dongle(&girbil);
83}
84
85static int girbil_open(struct sir_dev *dev)
86{
87 struct qos_info *qos = &dev->qos;
88
89 IRDA_DEBUG(2, "%s()\n", __func__);
90
91 /* Power on dongle */
92 sirdev_set_dtr_rts(dev, TRUE, TRUE);
93
94 qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
95 qos->min_turn_time.bits = 0x03;
96 irda_qos_bits_to_value(qos);
97
98 /* irda thread waits 50 msec for power settling */
99
100 return 0;
101}
102
103static int girbil_close(struct sir_dev *dev)
104{
105 IRDA_DEBUG(2, "%s()\n", __func__);
106
107 /* Power off dongle */
108 sirdev_set_dtr_rts(dev, FALSE, FALSE);
109
110 return 0;
111}
112
113/*
114 * Function girbil_change_speed (dev, speed)
115 *
116 * Set the speed for the Girbil type dongle.
117 *
118 */
119
120#define GIRBIL_STATE_WAIT_SPEED (SIRDEV_STATE_DONGLE_SPEED + 1)
121
122static int girbil_change_speed(struct sir_dev *dev, unsigned speed)
123{
124 unsigned state = dev->fsm.substate;
125 unsigned delay = 0;
126 u8 control[2];
127 static int ret = 0;
128
129 IRDA_DEBUG(2, "%s()\n", __func__);
130
131 /* dongle alread reset - port and dongle at default speed */
132
133 switch(state) {
134
135 case SIRDEV_STATE_DONGLE_SPEED:
136
137 /* Set DTR and Clear RTS to enter command mode */
138 sirdev_set_dtr_rts(dev, FALSE, TRUE);
139
140 udelay(25); /* better wait a little while */
141
142 ret = 0;
143 switch (speed) {
144 default:
145 ret = -EINVAL;
146 /* fall through */
147 case 9600:
148 control[0] = GIRBIL_9600;
149 break;
150 case 19200:
151 control[0] = GIRBIL_19200;
152 break;
153 case 34800:
154 control[0] = GIRBIL_38400;
155 break;
156 case 57600:
157 control[0] = GIRBIL_57600;
158 break;
159 case 115200:
160 control[0] = GIRBIL_115200;
161 break;
162 }
163 control[1] = GIRBIL_LOAD;
164
165 /* Write control bytes */
166 sirdev_raw_write(dev, control, 2);
167
168 dev->speed = speed;
169
170 state = GIRBIL_STATE_WAIT_SPEED;
171 delay = 100;
172 break;
173
174 case GIRBIL_STATE_WAIT_SPEED:
175 /* Go back to normal mode */
176 sirdev_set_dtr_rts(dev, TRUE, TRUE);
177
178 udelay(25); /* better wait a little while */
179 break;
180
181 default:
182 IRDA_ERROR("%s - undefined state %d\n", __func__, state);
183 ret = -EINVAL;
184 break;
185 }
186 dev->fsm.substate = state;
187 return (delay > 0) ? delay : ret;
188}
189
190/*
191 * Function girbil_reset (driver)
192 *
193 * This function resets the girbil dongle.
194 *
195 * Algorithm:
196 * 0. set RTS, and wait at least 5 ms
197 * 1. clear RTS
198 */
199
200
201#define GIRBIL_STATE_WAIT1_RESET (SIRDEV_STATE_DONGLE_RESET + 1)
202#define GIRBIL_STATE_WAIT2_RESET (SIRDEV_STATE_DONGLE_RESET + 2)
203#define GIRBIL_STATE_WAIT3_RESET (SIRDEV_STATE_DONGLE_RESET + 3)
204
205static int girbil_reset(struct sir_dev *dev)
206{
207 unsigned state = dev->fsm.substate;
208 unsigned delay = 0;
209 u8 control = GIRBIL_TXEN | GIRBIL_RXEN;
210 int ret = 0;
211
212 IRDA_DEBUG(2, "%s()\n", __func__);
213
214 switch (state) {
215 case SIRDEV_STATE_DONGLE_RESET:
216 /* Reset dongle */
217 sirdev_set_dtr_rts(dev, TRUE, FALSE);
218 /* Sleep at least 5 ms */
219 delay = 20;
220 state = GIRBIL_STATE_WAIT1_RESET;
221 break;
222
223 case GIRBIL_STATE_WAIT1_RESET:
224 /* Set DTR and clear RTS to enter command mode */
225 sirdev_set_dtr_rts(dev, FALSE, TRUE);
226 delay = 20;
227 state = GIRBIL_STATE_WAIT2_RESET;
228 break;
229
230 case GIRBIL_STATE_WAIT2_RESET:
231 /* Write control byte */
232 sirdev_raw_write(dev, &control, 1);
233 delay = 20;
234 state = GIRBIL_STATE_WAIT3_RESET;
235 break;
236
237 case GIRBIL_STATE_WAIT3_RESET:
238 /* Go back to normal mode */
239 sirdev_set_dtr_rts(dev, TRUE, TRUE);
240 dev->speed = 9600;
241 break;
242
243 default:
244 IRDA_ERROR("%s(), undefined state %d\n", __func__, state);
245 ret = -1;
246 break;
247 }
248 dev->fsm.substate = state;
249 return (delay > 0) ? delay : ret;
250}
251
252MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
253MODULE_DESCRIPTION("Greenwich GIrBIL dongle driver");
254MODULE_LICENSE("GPL");
255MODULE_ALIAS("irda-dongle-4"); /* IRDA_GIRBIL_DONGLE */
256
257module_init(girbil_sir_init);
258module_exit(girbil_sir_cleanup);