esi-sir.c

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/*********************************************************************
 *                
 * Filename:      esi.c
 * Version:       1.6
 * Description:   Driver for the Extended Systems JetEye PC dongle
 * Status:        Experimental.
 * Author:        Dag Brattli <[email protected]>
 * Created at:    Sat Feb 21 18:54:38 1998
 * Modified at:   Sun Oct 27 22:01:04 2002
 * Modified by:   Martin Diehl <[email protected]>
 * 
 *     Copyright (c) 1999 Dag Brattli, <[email protected]>,
 *     Copyright (c) 1998 Thomas Davis, <[email protected]>,
 *     Copyright (c) 2002 Martin Diehl, <[email protected]>,
 *     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.
 * 
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *     GNU General Public License for more details.
 * 
 *     You should have received a copy of the GNU General Public License 
 *     along with this program; if not, write to the Free Software 
 *     Foundation, Inc., 59 Temple Place, Suite 330, Boston, 
 *     MA 02111-1307 USA
 *     
 ********************************************************************/

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/init.h>

#include <net/irda/irda.h>

#include "sir-dev.h"

static int esi_open(struct sir_dev *);
static int esi_close(struct sir_dev *);
static int esi_change_speed(struct sir_dev *, unsigned);
static int esi_reset(struct sir_dev *);

static struct dongle_driver esi = {
    .owner      = THIS_MODULE,
    .driver_name    = "JetEye PC ESI-9680 PC",
    .type       = IRDA_ESI_DONGLE,
    .open       = esi_open,
    .close      = esi_close,
    .reset      = esi_reset,
    .set_speed  = esi_change_speed,
};

static int __init esi_sir_init(void)
{
    return irda_register_dongle(&esi);
}

static void __exit esi_sir_cleanup(void)
{
    irda_unregister_dongle(&esi);
}

static int esi_open(struct sir_dev *dev)
{
    struct qos_info *qos = &dev->qos;

    /* Power up and set dongle to 9600 baud */
    sirdev_set_dtr_rts(dev, FALSE, TRUE);

    qos->baud_rate.bits &= IR_9600|IR_19200|IR_115200;
    qos->min_turn_time.bits = 0x01; /* Needs at least 10 ms */
    irda_qos_bits_to_value(qos);

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

    return 0;
}

static int esi_close(struct sir_dev *dev)
{
    /* Power off dongle */
    sirdev_set_dtr_rts(dev, FALSE, FALSE);

    return 0;
}

/*
 * Function esi_change_speed (task)
 *
 * Set the speed for the Extended Systems JetEye PC ESI-9680 type dongle
 * Apparently (see old esi-driver) no delays are needed here...
 *
 */
static int esi_change_speed(struct sir_dev *dev, unsigned speed)
{
    int ret = 0;
    int dtr, rts;
    
    switch (speed) {
    case 19200:
        dtr = TRUE;
        rts = FALSE;
        break;
    case 115200:
        dtr = rts = TRUE;
        break;
    default:
        ret = -EINVAL;
        speed = 9600;
        /* fall through */
    case 9600:
        dtr = FALSE;
        rts = TRUE;
        break;
    }

    /* Change speed of dongle */
    sirdev_set_dtr_rts(dev, dtr, rts);
    dev->speed = speed;

    return ret;
}

/*
 * Function esi_reset (task)
 *
 *    Reset dongle;
 *
 */
static int esi_reset(struct sir_dev *dev)
{
    sirdev_set_dtr_rts(dev, FALSE, FALSE);

    /* Hm, the old esi-driver left the dongle unpowered relying on
     * the following speed change to repower. This might work for
     * the esi because we only need the modem lines. However, now the
     * general rule is reset must bring the dongle to some working
     * well-known state because speed change might write to registers.
     * The old esi-driver didn't any delay here - let's hope it' fine.
     */

    sirdev_set_dtr_rts(dev, FALSE, TRUE);
    dev->speed = 9600;

    return 0;
}

MODULE_AUTHOR("Dag Brattli <[email protected]>");
MODULE_DESCRIPTION("Extended Systems JetEye PC dongle driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("irda-dongle-1"); /* IRDA_ESI_DONGLE */

module_init(esi_sir_init);
module_exit(esi_sir_cleanup);