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/*********************************************************************

 *

 * Filename:      act200l.c

 * Version:       0.8

 * Description:   Implementation for the ACTiSYS ACT-IR200L dongle

 * Status:        Experimental.

 * Author:        SHIMIZU Takuya <tshimizu@ga2.so-net.ne.jp>

 * Created at:    Fri Aug  3 17:35:42 2001

 * Modified at:   Fri Aug 17 10:22:40 2001

 * Modified by:   SHIMIZU Takuya <tshimizu@ga2.so-net.ne.jp>

 *

 *     Copyright (c) 2001 SHIMIZU Takuya, All Rights Reserved.

 *

 *     This program is free software; you can redistribute it and/or

 *     modify it under the terms of the GNU General Public License as

 *     published by the Free Software Foundation; either version 2 of

 *     the License, or (at your option) any later version.

 *

 ********************************************************************/

#include <linux/module.h>

#include <linux/delay.h>

#include <linux/init.h>

#include <net/irda/irda.h>

#include "sir-dev.h"

static int act200l_reset(struct sir_dev *dev);

static int act200l_open(struct sir_dev *dev);

static int act200l_close(struct sir_dev *dev);

static int act200l_change_speed(struct sir_dev *dev, unsigned speed);

/* Regsiter 0: Control register #1 */

#define ACT200L_REG0    0x00

#define ACT200L_TXEN    0x01 /* Enable transmitter */

#define ACT200L_RXEN    0x02 /* Enable receiver */

/* Register 1: Control register #2 */

#define ACT200L_REG1    0x10

#define ACT200L_LODB    0x01 /* Load new baud rate count value */

#define ACT200L_WIDE    0x04 /* Expand the maximum allowable pulse */

/* Register 4: Output Power register */

#define ACT200L_REG4    0x40

#define ACT200L_OP0     0x01 /* Enable LED1C output */

#define ACT200L_OP1     0x02 /* Enable LED2C output */

#define ACT200L_BLKR    0x04

/* Register 5: Receive Mode register */

#define ACT200L_REG5    0x50

#define ACT200L_RWIDL   0x01 /* fixed 1.6us pulse mode */

/* Register 6: Receive Sensitivity register #1 */

#define ACT200L_REG6    0x60

#define ACT200L_RS0     0x01 /* receive threshold bit 0 */

#define ACT200L_RS1     0x02 /* receive threshold bit 1 */

/* Register 7: Receive Sensitivity register #2 */

#define ACT200L_REG7    0x70

#define ACT200L_ENPOS   0x04 /* Ignore the falling edge */

/* Register 8,9: Baud Rate Dvider register #1,#2 */

#define ACT200L_REG8    0x80

#define ACT200L_REG9    0x90

#define ACT200L_2400    0x5f

#define ACT200L_9600    0x17

#define ACT200L_19200   0x0b

#define ACT200L_38400   0x05

#define ACT200L_57600   0x03

#define ACT200L_115200  0x01

/* Register 13: Control register #3 */

#define ACT200L_REG13   0xd0

#define ACT200L_SHDW    0x01 /* Enable access to shadow registers */

/* Register 15: Status register */

#define ACT200L_REG15   0xf0

/* Register 21: Control register #4 */

#define ACT200L_REG21   0x50

#define ACT200L_EXCK    0x02 /* Disable clock output driver */

#define ACT200L_OSCL    0x04 /* oscillator in low power, medium accuracy mode */

static struct dongle_driver act200l = {

        .owner          = THIS_MODULE,

        .driver_name    = "ACTiSYS ACT-IR200L",

        .type           = IRDA_ACT200L_DONGLE,

        .open           = act200l_open,

        .close          = act200l_close,

        .reset          = act200l_reset,

        .set_speed      = act200l_change_speed,

};

static int __init act200l_sir_init(void)

{

        return irda_register_dongle(&act200l);

}

static void __exit act200l_sir_cleanup(void)

{

        irda_unregister_dongle(&act200l);

}

static int act200l_open(struct sir_dev *dev)

{

        struct qos_info *qos = &dev->qos;

        IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

        /* Power on the dongle */

        sirdev_set_dtr_rts(dev, TRUE, TRUE);

        /* Set the speeds we can accept */

        qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;

        qos->min_turn_time.bits = 0x03;

        irda_qos_bits_to_value(qos);

        /* irda thread waits 50 msec for power settling */

        return 0;

}

static int act200l_close(struct sir_dev *dev)

{

        IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

        /* Power off the dongle */

        sirdev_set_dtr_rts(dev, FALSE, FALSE);

        return 0;

}

/*

 * Function act200l_change_speed (dev, speed)

 *

 *    Set the speed for the ACTiSYS ACT-IR200L type dongle.

 *

 */

static int act200l_change_speed(struct sir_dev *dev, unsigned speed)

{

        u8 control[3];

        int ret = 0;

        IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

        /* Clear DTR and set RTS to enter command mode */

        sirdev_set_dtr_rts(dev, FALSE, TRUE);

        switch (speed) {

        default:

                ret = -EINVAL;

                /* fall through */

        case 9600:

                control[0] = ACT200L_REG8 |  (ACT200L_9600       & 0x0f);

                control[1] = ACT200L_REG9 | ((ACT200L_9600 >> 4) & 0x0f);

                break;

        case 19200:

                control[0] = ACT200L_REG8 |  (ACT200L_19200       & 0x0f);

                control[1] = ACT200L_REG9 | ((ACT200L_19200 >> 4) & 0x0f);

                break;

        case 38400:

                control[0] = ACT200L_REG8 |  (ACT200L_38400       & 0x0f);

                control[1] = ACT200L_REG9 | ((ACT200L_38400 >> 4) & 0x0f);

                break;

        case 57600:

                control[0] = ACT200L_REG8 |  (ACT200L_57600       & 0x0f);

                control[1] = ACT200L_REG9 | ((ACT200L_57600 >> 4) & 0x0f);

                break;

        case 115200:

                control[0] = ACT200L_REG8 |  (ACT200L_115200       & 0x0f);

                control[1] = ACT200L_REG9 | ((ACT200L_115200 >> 4) & 0x0f);

                break;

        }

        control[2] = ACT200L_REG1 | ACT200L_LODB | ACT200L_WIDE;

        /* Write control bytes */

        sirdev_raw_write(dev, control, 3);

        msleep(5);

        /* Go back to normal mode */

        sirdev_set_dtr_rts(dev, TRUE, TRUE);

        dev->speed = speed;

        return ret;

}

/*

 * Function act200l_reset (driver)

 *

 *    Reset the ACTiSYS ACT-IR200L type dongle.

 */

#define ACT200L_STATE_WAIT1_RESET       (SIRDEV_STATE_DONGLE_RESET+1)

#define ACT200L_STATE_WAIT2_RESET       (SIRDEV_STATE_DONGLE_RESET+2)

static int act200l_reset(struct sir_dev *dev)

{

        unsigned state = dev->fsm.substate;

        unsigned delay = 0;

        u8 control[9] = {

                ACT200L_REG15,

                ACT200L_REG13 | ACT200L_SHDW,

                ACT200L_REG21 | ACT200L_EXCK | ACT200L_OSCL,

                ACT200L_REG13,

                ACT200L_REG7  | ACT200L_ENPOS,

                ACT200L_REG6  | ACT200L_RS0  | ACT200L_RS1,

                ACT200L_REG5  | ACT200L_RWIDL,

                ACT200L_REG4  | ACT200L_OP0  | ACT200L_OP1 | ACT200L_BLKR,

                ACT200L_REG0  | ACT200L_TXEN | ACT200L_RXEN

        };

        int ret = 0;

        IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

        switch (state) {

        case SIRDEV_STATE_DONGLE_RESET:

                /* Reset the dongle : set RTS low for 25 ms */

                sirdev_set_dtr_rts(dev, TRUE, FALSE);

                state = ACT200L_STATE_WAIT1_RESET;

                delay = 50;

                break;

        case ACT200L_STATE_WAIT1_RESET:

                /* Clear DTR and set RTS to enter command mode */

                sirdev_set_dtr_rts(dev, FALSE, TRUE);

                udelay(25);                     /* better wait for some short while */

                /* Write control bytes */

                sirdev_raw_write(dev, control, sizeof(control));

                state = ACT200L_STATE_WAIT2_RESET;

                delay = 15;

                break;

        case ACT200L_STATE_WAIT2_RESET:

                /* Go back to normal mode */

                sirdev_set_dtr_rts(dev, TRUE, TRUE);

                dev->speed = 9600;

                break;

        default:

                IRDA_ERROR("%s(), unknown state %d\n", __FUNCTION__, state);

                ret = -1;

                break;

        }

        dev->fsm.substate = state;

        return (delay > 0) ? delay : ret;

}

MODULE_AUTHOR("SHIMIZU Takuya <tshimizu@ga2.so-net.ne.jp>");

MODULE_DESCRIPTION("ACTiSYS ACT-IR200L dongle driver");

MODULE_LICENSE("GPL");

MODULE_ALIAS("irda-dongle-10"); /* IRDA_ACT200L_DONGLE */

module_init(act200l_sir_init);

module_exit(act200l_sir_cleanup);