Merge git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6
[linux-2.6] / drivers / net / irda / girbil-sir.c
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
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 */
41 #define GIRBIL_ECAN    0x04 /* Cancel self emmited 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
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
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
103 static 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
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
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
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
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
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);