drivers/net/irda/act200l-sir.c

   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
  96 static int __init act200l_sir_init(void)
  97 {
  98         return irda_register_dongle(&act200l);
  99 }
 100
 101 static void __exit act200l_sir_cleanup(void)
 102 {
 103         irda_unregister_dongle(&act200l);
 104 }
 105
 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
 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  */
 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
 198 static int act200l_reset(struct sir_dev *dev)
 199 {
 200         unsigned state = dev->fsm.substate;
 201         unsigned delay = 0;
 202         static const 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);