/*********************************************************************
*
* 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", __func__);
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", __func__);
/* 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", __func__);
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", __func__, 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", __func__);
/* 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);