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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  *
  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", __FUNCTION__);
  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", __FUNCTION__);
 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", __FUNCTION__);
 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", __FUNCTION__, 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", __FUNCTION__);
 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", __FUNCTION__, 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);