Subversion Repositories test_project

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

 *

 * Filename:      tekram.c

 * Version:       1.3

 * Description:   Implementation of the Tekram IrMate IR-210B dongle

 * Status:        Experimental.

 * Author:        Dag Brattli <dagb@cs.uit.no>

 * Created at:    Wed Oct 21 20:02:35 1998

 * Modified at:   Sun Oct 27 22:02:38 2002

 * Modified by:   Martin Diehl <mad@mdiehl.de>

 *

 *     Copyright (c) 1998-1999 Dag Brattli,

 *     Copyright (c) 2002 Martin Diehl,

 *     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.

 *

 *     Neither Dag Brattli nor University of Tromsø admit liability nor

 *     provide warranty for any of this software. This material is

 *     provided "AS-IS" and at no charge.

 *

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

#include <linux/module.h>

#include <linux/delay.h>

#include <linux/init.h>

#include <net/irda/irda.h>

#include "sir-dev.h"

static int tekram_delay = 150;          /* default is 150 ms */

module_param(tekram_delay, int, 0);

MODULE_PARM_DESC(tekram_delay, "tekram dongle write complete delay");

static int tekram_open(struct sir_dev *);

static int tekram_close(struct sir_dev *);

static int tekram_change_speed(struct sir_dev *, unsigned);

static int tekram_reset(struct sir_dev *);

#define TEKRAM_115200 0x00

#define TEKRAM_57600  0x01

#define TEKRAM_38400  0x02

#define TEKRAM_19200  0x03

#define TEKRAM_9600   0x04

#define TEKRAM_PW     0x10 /* Pulse select bit */

static struct dongle_driver tekram = {

        .owner          = THIS_MODULE,

        .driver_name    = "Tekram IR-210B",

        .type           = IRDA_TEKRAM_DONGLE,

        .open           = tekram_open,

        .close          = tekram_close,

        .reset          = tekram_reset,

        .set_speed      = tekram_change_speed,

};

static int __init tekram_sir_init(void)

{

        if (tekram_delay < 1  ||  tekram_delay > 500)

                tekram_delay = 200;

        IRDA_DEBUG(1, "%s - using %d ms delay\n",

                tekram.driver_name, tekram_delay);

        return irda_register_dongle(&tekram);

}

static void __exit tekram_sir_cleanup(void)

{

        irda_unregister_dongle(&tekram);

}

static int tekram_open(struct sir_dev *dev)

{

        struct qos_info *qos = &dev->qos;

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

        sirdev_set_dtr_rts(dev, TRUE, TRUE);

        qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|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 tekram_close(struct sir_dev *dev)

{

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

        /* Power off dongle */

        sirdev_set_dtr_rts(dev, FALSE, FALSE);

        return 0;

}

/*

 * Function tekram_change_speed (dev, state, speed)

 *

 *    Set the speed for the Tekram IRMate 210 type dongle. Warning, this

 *    function must be called with a process context!

 *

 *    Algorithm

 *    1. clear DTR

 *    2. set RTS, and wait at least 7 us

 *    3. send Control Byte to the IR-210 through TXD to set new baud rate

 *       wait until the stop bit of Control Byte is sent (for 9600 baud rate,

 *       it takes about 100 msec)

 *

 *      [oops, why 100 msec? sending 1 byte (10 bits) takes 1.05 msec

 *       - is this probably to compensate for delays in tty layer?]

 *

 *    5. clear RTS (return to NORMAL Operation)

 *    6. wait at least 50 us, new setting (baud rate, etc) takes effect here

 *       after

 */

#define TEKRAM_STATE_WAIT_SPEED (SIRDEV_STATE_DONGLE_SPEED + 1)

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

{

        unsigned state = dev->fsm.substate;

        unsigned delay = 0;

        u8 byte;

        static int ret = 0;

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

        switch(state) {

        case SIRDEV_STATE_DONGLE_SPEED:

                switch (speed) {

                default:

                        speed = 9600;

                        ret = -EINVAL;

                        /* fall thru */

                case 9600:

                        byte = TEKRAM_PW|TEKRAM_9600;

                        break;

                case 19200:

                        byte = TEKRAM_PW|TEKRAM_19200;

                        break;

                case 38400:

                        byte = TEKRAM_PW|TEKRAM_38400;

                        break;

                case 57600:

                        byte = TEKRAM_PW|TEKRAM_57600;

                        break;

                case 115200:

                        byte = TEKRAM_115200;

                        break;

                }

                /* Set DTR, Clear RTS */

                sirdev_set_dtr_rts(dev, TRUE, FALSE);

                /* Wait at least 7us */

                udelay(14);

                /* Write control byte */

                sirdev_raw_write(dev, &byte, 1);

                dev->speed = speed;

                state = TEKRAM_STATE_WAIT_SPEED;

                delay = tekram_delay;

                break;

        case TEKRAM_STATE_WAIT_SPEED:

                /* Set DTR, Set RTS */

                sirdev_set_dtr_rts(dev, TRUE, TRUE);

                udelay(50);

                break;

        default:

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

                ret = -EINVAL;

                break;

        }

        dev->fsm.substate = state;

        return (delay > 0) ? delay : ret;

}

/*

 * Function tekram_reset (driver)

 *

 *      This function resets the tekram dongle. Warning, this function

 *      must be called with a process context!!

 *

 *      Algorithm:

 *        0. Clear RTS and DTR, and wait 50 ms (power off the IR-210 )

 *        1. clear RTS

 *        2. set DTR, and wait at least 1 ms

 *        3. clear DTR to SPACE state, wait at least 50 us for further

 *         operation

 */

static int tekram_reset(struct sir_dev *dev)

{

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

        /* Clear DTR, Set RTS */

        sirdev_set_dtr_rts(dev, FALSE, TRUE);

        /* Should sleep 1 ms */

        msleep(1);

        /* Set DTR, Set RTS */

        sirdev_set_dtr_rts(dev, TRUE, TRUE);

        /* Wait at least 50 us */

        udelay(75);

        dev->speed = 9600;

        return 0;

}

MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");

MODULE_DESCRIPTION("Tekram IrMate IR-210B dongle driver");

MODULE_LICENSE("GPL");

MODULE_ALIAS("irda-dongle-0"); /* IRDA_TEKRAM_DONGLE */

module_init(tekram_sir_init);

module_exit(tekram_sir_cleanup);