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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 | * | |
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/init.h> | |
28 | ||
29 | #include <net/irda/irda.h> | |
30 | ||
31 | #include "sir-dev.h" | |
32 | ||
33 | static int girbil_reset(struct sir_dev *dev); | |
34 | static int girbil_open(struct sir_dev *dev); | |
35 | static int girbil_close(struct sir_dev *dev); | |
36 | static 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 */ | |
25985edc | 41 | #define GIRBIL_ECAN 0x04 /* Cancel self emitted data */ |
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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 | ||
65 | static 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 | ||
75 | static int __init girbil_sir_init(void) | |
76 | { | |
77 | return irda_register_dongle(&girbil); | |
78 | } | |
79 | ||
80 | static void __exit girbil_sir_cleanup(void) | |
81 | { | |
82 | irda_unregister_dongle(&girbil); | |
83 | } | |
84 | ||
85 | static int girbil_open(struct sir_dev *dev) | |
86 | { | |
87 | struct qos_info *qos = &dev->qos; | |
88 | ||
a97a6f10 | 89 | IRDA_DEBUG(2, "%s()\n", __func__); |
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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 | ||
103 | static int girbil_close(struct sir_dev *dev) | |
104 | { | |
a97a6f10 | 105 | IRDA_DEBUG(2, "%s()\n", __func__); |
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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 | ||
122 | static 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 | ||
a97a6f10 | 129 | IRDA_DEBUG(2, "%s()\n", __func__); |
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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: | |
a97a6f10 | 182 | IRDA_ERROR("%s - undefined state %d\n", __func__, state); |
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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 | ||
205 | static 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 | ||
a97a6f10 | 212 | IRDA_DEBUG(2, "%s()\n", __func__); |
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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: | |
a97a6f10 | 244 | IRDA_ERROR("%s(), undefined state %d\n", __func__, state); |
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245 | ret = -1; |
246 | break; | |
247 | } | |
248 | dev->fsm.substate = state; | |
249 | return (delay > 0) ? delay : ret; | |
250 | } | |
251 | ||
252 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); | |
253 | MODULE_DESCRIPTION("Greenwich GIrBIL dongle driver"); | |
254 | MODULE_LICENSE("GPL"); | |
255 | MODULE_ALIAS("irda-dongle-4"); /* IRDA_GIRBIL_DONGLE */ | |
256 | ||
257 | module_init(girbil_sir_init); | |
258 | module_exit(girbil_sir_cleanup); |