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

 *

 * Filename:      girbil.c

 * Version:       1.2

 * Description:   Implementation for the Greenwich GIrBIL dongle

 * Status:        Experimental.

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

 * Created at:    Sat Feb  6 21:02:33 1999

 * Modified at:   Fri Dec 17 09:13:20 1999

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

 *

 *     Copyright (c) 1999 Dag Brattli, 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/tty.h>

#include <linux/init.h>

#include <net/irda/irda.h>

#include <net/irda/irda_device.h>

static int  girbil_reset(struct irda_task *task);

static void girbil_open(dongle_t *self, struct qos_info *qos);

static void girbil_close(dongle_t *self);

static int  girbil_change_speed(struct irda_task *task);

/* Control register 1 */

#define GIRBIL_TXEN    0x01 /* Enable transmitter */

#define GIRBIL_RXEN    0x02 /* Enable receiver */

#define GIRBIL_ECAN    0x04 /* Cancel self emmited data */

#define GIRBIL_ECHO    0x08 /* Echo control characters */

/* LED Current Register (0x2) */

#define GIRBIL_HIGH    0x20

#define GIRBIL_MEDIUM  0x21

#define GIRBIL_LOW     0x22

/* Baud register (0x3) */

#define GIRBIL_2400    0x30

#define GIRBIL_4800    0x31     

#define GIRBIL_9600    0x32

#define GIRBIL_19200   0x33

#define GIRBIL_38400   0x34     

#define GIRBIL_57600   0x35     

#define GIRBIL_115200  0x36

/* Mode register (0x4) */

#define GIRBIL_IRDA    0x40

#define GIRBIL_ASK     0x41

/* Control register 2 (0x5) */

#define GIRBIL_LOAD    0x51 /* Load the new baud rate value */

static struct dongle_reg dongle = {

        .type = IRDA_GIRBIL_DONGLE,

        .open = girbil_open,

        .close = girbil_close,

        .reset = girbil_reset,

        .change_speed = girbil_change_speed,

        .owner = THIS_MODULE,

};

static int __init girbil_init(void)

{

        return irda_device_register_dongle(&dongle);

}

static void __exit girbil_cleanup(void)

{

        irda_device_unregister_dongle(&dongle);

}

static void girbil_open(dongle_t *self, struct qos_info *qos)

{

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

        qos->min_turn_time.bits = 0x03;

}

static void girbil_close(dongle_t *self)

{

        /* Power off dongle */

        self->set_dtr_rts(self->dev, FALSE, FALSE);

}

/*

 * Function girbil_change_speed (dev, speed)

 *

 *    Set the speed for the Girbil type dongle.

 *

 */

static int girbil_change_speed(struct irda_task *task)

{

        dongle_t *self = (dongle_t *) task->instance;

        __u32 speed = (__u32) task->param;

        __u8 control[2];

        int ret = 0;

        self->speed_task = task;

        switch (task->state) {

        case IRDA_TASK_INIT:

                /* Need to reset the dongle and go to 9600 bps before

                   programming */

                if (irda_task_execute(self, girbil_reset, NULL, task,

                                      (void *) speed))

                {

                        /* Dongle need more time to reset */

                        irda_task_next_state(task, IRDA_TASK_CHILD_WAIT);

                        /* Give reset 1 sec to finish */

                        ret = msecs_to_jiffies(1000);

                }

                break;

        case IRDA_TASK_CHILD_WAIT:

                IRDA_WARNING("%s(), resetting dongle timed out!\n",

                             __FUNCTION__);

                ret = -1;

                break;

        case IRDA_TASK_CHILD_DONE:

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

                self->set_dtr_rts(self->dev, FALSE, TRUE);

                switch (speed) {

                case 9600:

                default:

                        control[0] = GIRBIL_9600;

                        break;

                case 19200:

                        control[0] = GIRBIL_19200;

                        break;

                case 34800:

                        control[0] = GIRBIL_38400;

                        break;

                case 57600:

                        control[0] = GIRBIL_57600;

                        break;

                case 115200:

                        control[0] = GIRBIL_115200;

                        break;

                }

                control[1] = GIRBIL_LOAD;

                /* Write control bytes */

                self->write(self->dev, control, 2);

                irda_task_next_state(task, IRDA_TASK_WAIT);

                ret = msecs_to_jiffies(100);

                break;

        case IRDA_TASK_WAIT:

                /* Go back to normal mode */

                self->set_dtr_rts(self->dev, TRUE, TRUE);

                irda_task_next_state(task, IRDA_TASK_DONE);

                self->speed_task = NULL;

                break;

        default:

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

                           __FUNCTION__, task->state);

                irda_task_next_state(task, IRDA_TASK_DONE);

                self->speed_task = NULL;

                ret = -1;

                break;

        }

        return ret;

}

/*

 * Function girbil_reset (driver)

 *

 *      This function resets the girbil dongle.

 *

 *      Algorithm:

 *        0. set RTS, and wait at least 5 ms

 *        1. clear RTS

 */

static int girbil_reset(struct irda_task *task)

{

        dongle_t *self = (dongle_t *) task->instance;

        __u8 control = GIRBIL_TXEN | GIRBIL_RXEN;

        int ret = 0;

        self->reset_task = task;

        switch (task->state) {

        case IRDA_TASK_INIT:

                /* Reset dongle */

                self->set_dtr_rts(self->dev, TRUE, FALSE);

                irda_task_next_state(task, IRDA_TASK_WAIT1);

                /* Sleep at least 5 ms */

                ret = msecs_to_jiffies(20);

                break;

        case IRDA_TASK_WAIT1:

                /* Set DTR and clear RTS to enter command mode */

                self->set_dtr_rts(self->dev, FALSE, TRUE);

                irda_task_next_state(task, IRDA_TASK_WAIT2);

                ret = msecs_to_jiffies(20);

                break;

        case IRDA_TASK_WAIT2:

                /* Write control byte */

                self->write(self->dev, &control, 1);

                irda_task_next_state(task, IRDA_TASK_WAIT3);

                ret = msecs_to_jiffies(20);

                break;

        case IRDA_TASK_WAIT3:

                /* Go back to normal mode */

                self->set_dtr_rts(self->dev, TRUE, TRUE);

                irda_task_next_state(task, IRDA_TASK_DONE);

                self->reset_task = NULL;

                break;

        default:

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

                           __FUNCTION__, task->state);

                irda_task_next_state(task, IRDA_TASK_DONE);

                self->reset_task = NULL;

                ret = -1;

                break;

        }

        return ret;

}

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

MODULE_DESCRIPTION("Greenwich GIrBIL dongle driver");

MODULE_LICENSE("GPL");

MODULE_ALIAS("irda-dongle-4"); /* IRDA_GIRBIL_DONGLE */

/*

 * Function init_module (void)

 *

 *    Initialize Girbil module

 *

 */

module_init(girbil_init);

/*

 * Function cleanup_module (void)

 *

 *    Cleanup Girbil module

 *

 */

module_exit(girbil_cleanup);