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 /* Power on the dongle */
111 sirdev_set_dtr_rts(dev, TRUE, TRUE);
112
113 /* Set the speeds we can accept */
114 qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
115 qos->min_turn_time.bits = 0x03;
116 irda_qos_bits_to_value(qos);
117
118 /* irda thread waits 50 msec for power settling */
119
120 return 0;
121 }
122
act200l_close(struct sir_dev * dev)123 static int act200l_close(struct sir_dev *dev)
124 {
125 /* Power off the dongle */
126 sirdev_set_dtr_rts(dev, FALSE, FALSE);
127
128 return 0;
129 }
130
131 /*
132 * Function act200l_change_speed (dev, speed)
133 *
134 * Set the speed for the ACTiSYS ACT-IR200L type dongle.
135 *
136 */
act200l_change_speed(struct sir_dev * dev,unsigned speed)137 static int act200l_change_speed(struct sir_dev *dev, unsigned speed)
138 {
139 u8 control[3];
140 int ret = 0;
141
142 /* Clear DTR and set RTS to enter command mode */
143 sirdev_set_dtr_rts(dev, FALSE, TRUE);
144
145 switch (speed) {
146 default:
147 ret = -EINVAL;
148 /* fall through */
149 case 9600:
150 control[0] = ACT200L_REG8 | (ACT200L_9600 & 0x0f);
151 control[1] = ACT200L_REG9 | ((ACT200L_9600 >> 4) & 0x0f);
152 break;
153 case 19200:
154 control[0] = ACT200L_REG8 | (ACT200L_19200 & 0x0f);
155 control[1] = ACT200L_REG9 | ((ACT200L_19200 >> 4) & 0x0f);
156 break;
157 case 38400:
158 control[0] = ACT200L_REG8 | (ACT200L_38400 & 0x0f);
159 control[1] = ACT200L_REG9 | ((ACT200L_38400 >> 4) & 0x0f);
160 break;
161 case 57600:
162 control[0] = ACT200L_REG8 | (ACT200L_57600 & 0x0f);
163 control[1] = ACT200L_REG9 | ((ACT200L_57600 >> 4) & 0x0f);
164 break;
165 case 115200:
166 control[0] = ACT200L_REG8 | (ACT200L_115200 & 0x0f);
167 control[1] = ACT200L_REG9 | ((ACT200L_115200 >> 4) & 0x0f);
168 break;
169 }
170 control[2] = ACT200L_REG1 | ACT200L_LODB | ACT200L_WIDE;
171
172 /* Write control bytes */
173 sirdev_raw_write(dev, control, 3);
174 msleep(5);
175
176 /* Go back to normal mode */
177 sirdev_set_dtr_rts(dev, TRUE, TRUE);
178
179 dev->speed = speed;
180 return ret;
181 }
182
183 /*
184 * Function act200l_reset (driver)
185 *
186 * Reset the ACTiSYS ACT-IR200L type dongle.
187 */
188
189 #define ACT200L_STATE_WAIT1_RESET (SIRDEV_STATE_DONGLE_RESET+1)
190 #define ACT200L_STATE_WAIT2_RESET (SIRDEV_STATE_DONGLE_RESET+2)
191
act200l_reset(struct sir_dev * dev)192 static int act200l_reset(struct sir_dev *dev)
193 {
194 unsigned state = dev->fsm.substate;
195 unsigned delay = 0;
196 static const u8 control[9] = {
197 ACT200L_REG15,
198 ACT200L_REG13 | ACT200L_SHDW,
199 ACT200L_REG21 | ACT200L_EXCK | ACT200L_OSCL,
200 ACT200L_REG13,
201 ACT200L_REG7 | ACT200L_ENPOS,
202 ACT200L_REG6 | ACT200L_RS0 | ACT200L_RS1,
203 ACT200L_REG5 | ACT200L_RWIDL,
204 ACT200L_REG4 | ACT200L_OP0 | ACT200L_OP1 | ACT200L_BLKR,
205 ACT200L_REG0 | ACT200L_TXEN | ACT200L_RXEN
206 };
207 int ret = 0;
208
209 switch (state) {
210 case SIRDEV_STATE_DONGLE_RESET:
211 /* Reset the dongle : set RTS low for 25 ms */
212 sirdev_set_dtr_rts(dev, TRUE, FALSE);
213 state = ACT200L_STATE_WAIT1_RESET;
214 delay = 50;
215 break;
216
217 case ACT200L_STATE_WAIT1_RESET:
218 /* Clear DTR and set RTS to enter command mode */
219 sirdev_set_dtr_rts(dev, FALSE, TRUE);
220
221 udelay(25); /* better wait for some short while */
222
223 /* Write control bytes */
224 sirdev_raw_write(dev, control, sizeof(control));
225 state = ACT200L_STATE_WAIT2_RESET;
226 delay = 15;
227 break;
228
229 case ACT200L_STATE_WAIT2_RESET:
230 /* Go back to normal mode */
231 sirdev_set_dtr_rts(dev, TRUE, TRUE);
232 dev->speed = 9600;
233 break;
234 default:
235 net_err_ratelimited("%s(), unknown state %d\n",
236 __func__, state);
237 ret = -1;
238 break;
239 }
240 dev->fsm.substate = state;
241 return (delay > 0) ? delay : ret;
242 }
243
244 MODULE_AUTHOR("SHIMIZU Takuya <tshimizu@ga2.so-net.ne.jp>");
245 MODULE_DESCRIPTION("ACTiSYS ACT-IR200L dongle driver");
246 MODULE_LICENSE("GPL");
247 MODULE_ALIAS("irda-dongle-10"); /* IRDA_ACT200L_DONGLE */
248
249 module_init(act200l_sir_init);
250 module_exit(act200l_sir_cleanup);
251