LXR linux/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
  29static int act200l_reset(struct sir_dev *dev);
  30static int act200l_open(struct sir_dev *dev);
  31static int act200l_close(struct sir_dev *dev);
  32static 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
  86static 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
  96static int __init act200l_sir_init(void)
  97{
  98        return irda_register_dongle(&act200l);
  99}
 100
 101static void __exit act200l_sir_cleanup(void)
 102{
 103        irda_unregister_dongle(&act200l);
 104}
 105
 106static 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
 125static 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 */
 141static 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
 198static 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
 251MODULE_AUTHOR("SHIMIZU Takuya <tshimizu@ga2.so-net.ne.jp>");
 252MODULE_DESCRIPTION("ACTiSYS ACT-IR200L dongle driver");
 253MODULE_LICENSE("GPL");
 254MODULE_ALIAS("irda-dongle-10"); /* IRDA_ACT200L_DONGLE */
 255
 256module_init(act200l_sir_init);
 257module_exit(act200l_sir_cleanup);
 258