1 /*********************************************************************
2 *
3 * Filename: act200l.c
4 * Version: 0.8
5 * Description: Implementation for the ACTiSYS ACT-IR200L dongle
6 * Status: Experimental.
7 * Author: SHIMIZU Takuya <tshimizu@ga2.so-net.ne.jp>
8 * Created at: Fri Aug 3 17:35:42 2001
9 * Modified at: Fri Aug 17 10:22:40 2001
10 * Modified by: SHIMIZU Takuya <tshimizu@ga2.so-net.ne.jp>
11 *
12 * Copyright (c) 2001 SHIMIZU Takuya, 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 ********************************************************************/
20
21 #include <linux/module.h>
22 #include <linux/delay.h>
23 #include <linux/init.h>
24
25 #include <net/irda/irda.h>
26
27 #include "sir-dev.h"
28
29 static int act200l_reset(struct sir_dev *dev);
30 static int act200l_open(struct sir_dev *dev);
31 static int act200l_close(struct sir_dev *dev);
32 static int act200l_change_speed(struct sir_dev *dev, unsigned speed);
33
34 /* Regsiter 0: Control register #1 */
35 #define ACT200L_REG0 0x00
36 #define ACT200L_TXEN 0x01 /* Enable transmitter */
37 #define ACT200L_RXEN 0x02 /* Enable receiver */
38
39 /* Register 1: Control register #2 */
40 #define ACT200L_REG1 0x10
41 #define ACT200L_LODB 0x01 /* Load new baud rate count value */
42 #define ACT200L_WIDE 0x04 /* Expand the maximum allowable pulse */
43
44 /* Register 4: Output Power register */
45 #define ACT200L_REG4 0x40
46 #define ACT200L_OP0 0x01 /* Enable LED1C output */
47 #define ACT200L_OP1 0x02 /* Enable LED2C output */
48 #define ACT200L_BLKR 0x04
49
50 /* Register 5: Receive Mode register */
51 #define ACT200L_REG5 0x50
52 #define ACT200L_RWIDL 0x01 /* fixed 1.6us pulse mode */
53
54 /* Register 6: Receive Sensitivity register #1 */
55 #define ACT200L_REG6 0x60
56 #define ACT200L_RS0 0x01 /* receive threshold bit 0 */
57 #define ACT200L_RS1 0x02 /* receive threshold bit 1 */
58
59 /* Register 7: Receive Sensitivity register #2 */
60 #define ACT200L_REG7 0x70
61 #define ACT200L_ENPOS 0x04 /* Ignore the falling edge */
62
63 /* Register 8,9: Baud Rate Dvider register #1,#2 */
64 #define ACT200L_REG8 0x80
65 #define ACT200L_REG9 0x90
66
67 #define ACT200L_2400 0x5f
68 #define ACT200L_9600 0x17
69 #define ACT200L_19200 0x0b
70 #define ACT200L_38400 0x05
71 #define ACT200L_57600 0x03
72 #define ACT200L_115200 0x01
73
74 /* Register 13: Control register #3 */
75 #define ACT200L_REG13 0xd0
76 #define ACT200L_SHDW 0x01 /* Enable access to shadow registers */
77
78 /* Register 15: Status register */
79 #define ACT200L_REG15 0xf0
80
81 /* Register 21: Control register #4 */
82 #define ACT200L_REG21 0x50
83 #define ACT200L_EXCK 0x02 /* Disable clock output driver */
84 #define ACT200L_OSCL 0x04 /* oscillator in low power, medium accuracy mode */
85
86 static struct dongle_driver act200l = {
87 .owner = THIS_MODULE,
88 .driver_name = "ACTiSYS ACT-IR200L",
89 .type = IRDA_ACT200L_DONGLE,
90 .open = act200l_open,
91 .close = act200l_close,
92 .reset = act200l_reset,
93 .set_speed = act200l_change_speed,
94 };
95
act200l_sir_init(void)96 static int __init act200l_sir_init(void)
97 {
98 return irda_register_dongle(&act200l);
99 }
100
act200l_sir_cleanup(void)101 static void __exit act200l_sir_cleanup(void)
102 {
103 irda_unregister_dongle(&act200l);
104 }
105
act200l_open(struct sir_dev * dev)106 static int act200l_open(struct sir_dev *dev)
107 {
108 struct qos_info *qos = &dev->qos;
109
110 IRDA_DEBUG(2, "%s()\n", __func__ );
111
112 /* Power on the dongle */
113 sirdev_set_dtr_rts(dev, TRUE, TRUE);
114
115 /* Set the speeds we can accept */
116 qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
117 qos->min_turn_time.bits = 0x03;
118 irda_qos_bits_to_value(qos);
119
120 /* irda thread waits 50 msec for power settling */
121
122 return 0;
123 }
124
act200l_close(struct sir_dev * dev)125 static int act200l_close(struct sir_dev *dev)
126 {
127 IRDA_DEBUG(2, "%s()\n", __func__ );
128
129 /* Power off the dongle */
130 sirdev_set_dtr_rts(dev, FALSE, FALSE);
131
132 return 0;
133 }
134
135 /*
136 * Function act200l_change_speed (dev, speed)
137 *
138 * Set the speed for the ACTiSYS ACT-IR200L type dongle.
139 *
140 */
act200l_change_speed(struct sir_dev * dev,unsigned speed)141 static int act200l_change_speed(struct sir_dev *dev, unsigned speed)
142 {
143 u8 control[3];
144 int ret = 0;
145
146 IRDA_DEBUG(2, "%s()\n", __func__ );
147
148 /* Clear DTR and set RTS to enter command mode */
149 sirdev_set_dtr_rts(dev, FALSE, TRUE);
150
151 switch (speed) {
152 default:
153 ret = -EINVAL;
154 /* fall through */
155 case 9600:
156 control[0] = ACT200L_REG8 | (ACT200L_9600 & 0x0f);
157 control[1] = ACT200L_REG9 | ((ACT200L_9600 >> 4) & 0x0f);
158 break;
159 case 19200:
160 control[0] = ACT200L_REG8 | (ACT200L_19200 & 0x0f);
161 control[1] = ACT200L_REG9 | ((ACT200L_19200 >> 4) & 0x0f);
162 break;
163 case 38400:
164 control[0] = ACT200L_REG8 | (ACT200L_38400 & 0x0f);
165 control[1] = ACT200L_REG9 | ((ACT200L_38400 >> 4) & 0x0f);
166 break;
167 case 57600:
168 control[0] = ACT200L_REG8 | (ACT200L_57600 & 0x0f);
169 control[1] = ACT200L_REG9 | ((ACT200L_57600 >> 4) & 0x0f);
170 break;
171 case 115200:
172 control[0] = ACT200L_REG8 | (ACT200L_115200 & 0x0f);
173 control[1] = ACT200L_REG9 | ((ACT200L_115200 >> 4) & 0x0f);
174 break;
175 }
176 control[2] = ACT200L_REG1 | ACT200L_LODB | ACT200L_WIDE;
177
178 /* Write control bytes */
179 sirdev_raw_write(dev, control, 3);
180 msleep(5);
181
182 /* Go back to normal mode */
183 sirdev_set_dtr_rts(dev, TRUE, TRUE);
184
185 dev->speed = speed;
186 return ret;
187 }
188
189 /*
190 * Function act200l_reset (driver)
191 *
192 * Reset the ACTiSYS ACT-IR200L type dongle.
193 */
194
195 #define ACT200L_STATE_WAIT1_RESET (SIRDEV_STATE_DONGLE_RESET+1)
196 #define ACT200L_STATE_WAIT2_RESET (SIRDEV_STATE_DONGLE_RESET+2)
197
act200l_reset(struct sir_dev * dev)198 static int act200l_reset(struct sir_dev *dev)
199 {
200 unsigned state = dev->fsm.substate;
201 unsigned delay = 0;
202 u8 control[9] = {
203 ACT200L_REG15,
204 ACT200L_REG13 | ACT200L_SHDW,
205 ACT200L_REG21 | ACT200L_EXCK | ACT200L_OSCL,
206 ACT200L_REG13,
207 ACT200L_REG7 | ACT200L_ENPOS,
208 ACT200L_REG6 | ACT200L_RS0 | ACT200L_RS1,
209 ACT200L_REG5 | ACT200L_RWIDL,
210 ACT200L_REG4 | ACT200L_OP0 | ACT200L_OP1 | ACT200L_BLKR,
211 ACT200L_REG0 | ACT200L_TXEN | ACT200L_RXEN
212 };
213 int ret = 0;
214
215 IRDA_DEBUG(2, "%s()\n", __func__ );
216
217 switch (state) {
218 case SIRDEV_STATE_DONGLE_RESET:
219 /* Reset the dongle : set RTS low for 25 ms */
220 sirdev_set_dtr_rts(dev, TRUE, FALSE);
221 state = ACT200L_STATE_WAIT1_RESET;
222 delay = 50;
223 break;
224
225 case ACT200L_STATE_WAIT1_RESET:
226 /* Clear DTR and set RTS to enter command mode */
227 sirdev_set_dtr_rts(dev, FALSE, TRUE);
228
229 udelay(25); /* better wait for some short while */
230
231 /* Write control bytes */
232 sirdev_raw_write(dev, control, sizeof(control));
233 state = ACT200L_STATE_WAIT2_RESET;
234 delay = 15;
235 break;
236
237 case ACT200L_STATE_WAIT2_RESET:
238 /* Go back to normal mode */
239 sirdev_set_dtr_rts(dev, TRUE, TRUE);
240 dev->speed = 9600;
241 break;
242 default:
243 IRDA_ERROR("%s(), unknown state %d\n", __func__, state);
244 ret = -1;
245 break;
246 }
247 dev->fsm.substate = state;
248 return (delay > 0) ? delay : ret;
249 }
250
251 MODULE_AUTHOR("SHIMIZU Takuya <tshimizu@ga2.so-net.ne.jp>");
252 MODULE_DESCRIPTION("ACTiSYS ACT-IR200L dongle driver");
253 MODULE_LICENSE("GPL");
254 MODULE_ALIAS("irda-dongle-10"); /* IRDA_ACT200L_DONGLE */
255
256 module_init(act200l_sir_init);
257 module_exit(act200l_sir_cleanup);
258