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         /* 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
 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  */
 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
 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);