/********************************************************************* *                 * Filename:      litelink.c * Version:       1.1 * Description:   Driver for the Parallax LiteLink dongle * Status:        Stable * Author:        Dag Brattli <dagb@cs.uit.no> * Created at:    Fri May  7 12:50:33 1999 * Modified at:   Fri Dec 17 09:14:23 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. *  *     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 *      ********************************************************************//* * Modified at:   Thu Jan 15 2003 * Modified by:   Eugene Crosser <crosser@average.org> * * Convert to "new" IRDA infrastructure for kernel 2.6 */#include <linux/module.h>#include <linux/delay.h>#include <linux/init.h>#include <net/irda/irda.h>#include "sir-dev.h"#define MIN_DELAY 25      /* 15 us, but wait a little more to be sure */#define MAX_DELAY 10000   /* 1 ms */static int litelink_open(struct sir_dev *dev);static int litelink_close(struct sir_dev *dev);static int litelink_change_speed(struct sir_dev *dev, unsigned speed);static int litelink_reset(struct sir_dev *dev);/* These are the baudrates supported - 9600 must be last one! */static unsigned baud_rates[] = { 115200, 57600, 38400, 19200, 9600 };static struct dongle_driver litelink = {	.owner		= THIS_MODULE,	.driver_name	= "Parallax LiteLink",	.type		= IRDA_LITELINK_DONGLE,	.open		= litelink_open,	.close		= litelink_close,	.reset		= litelink_reset,	.set_speed	= litelink_change_speed,};static int __init litelink_sir_init(void){	return irda_register_dongle(&litelink);}static void __exit litelink_sir_cleanup(void){	irda_unregister_dongle(&litelink);}static int litelink_open(struct sir_dev *dev){	struct qos_info *qos = &dev->qos;	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);	/* Power up dongle */	sirdev_set_dtr_rts(dev, TRUE, TRUE);	/* Set the speeds we can accept */	qos->baud_rate.bits &= IR_115200|IR_57600|IR_38400|IR_19200|IR_9600;	qos->min_turn_time.bits = 0x7f; /* Needs 0.01 ms */	irda_qos_bits_to_value(qos);	/* irda thread waits 50 msec for power settling */	return 0;}static int litelink_close(struct sir_dev *dev){	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);	/* Power off dongle */	sirdev_set_dtr_rts(dev, FALSE, FALSE);	return 0;}/* * Function litelink_change_speed (task) * *    Change speed of the Litelink dongle. To cycle through the available  *    baud rates, pulse RTS low for a few ms.   */static int litelink_change_speed(struct sir_dev *dev, unsigned speed){        int i;	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);	/* dongle already reset by irda-thread - current speed (dongle and	 * port) is the default speed (115200 for litelink!)	 */	/* Cycle through avaiable baudrates until we reach the correct one */	for (i = 0; baud_rates[i] != speed; i++) {		/* end-of-list reached due to invalid speed request */		if (baud_rates[i] == 9600)			break;		/* Set DTR, clear RTS */		sirdev_set_dtr_rts(dev, FALSE, TRUE);		/* Sleep a minimum of 15 us */		udelay(MIN_DELAY);		/* Set DTR, Set RTS */		sirdev_set_dtr_rts(dev, TRUE, TRUE);		/* Sleep a minimum of 15 us */		udelay(MIN_DELAY);        }	dev->speed = baud_rates[i];	/* invalid baudrate should not happen - but if, we return -EINVAL and	 * the dongle configured for 9600 so the stack has a chance to recover	 */	return (dev->speed == speed) ? 0 : -EINVAL;}/* * Function litelink_reset (task) * *      Reset the Litelink type dongle. * */static int litelink_reset(struct sir_dev *dev){	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);	/* probably the power-up can be dropped here, but with only	 * 15 usec delay it's not worth the risk unless somebody with	 * the hardware confirms it doesn't break anything...	 */	/* Power on dongle */	sirdev_set_dtr_rts(dev, TRUE, TRUE);	/* Sleep a minimum of 15 us */	udelay(MIN_DELAY);	/* Clear RTS to reset dongle */	sirdev_set_dtr_rts(dev, TRUE, FALSE);	/* Sleep a minimum of 15 us */	udelay(MIN_DELAY);	/* Go back to normal mode */	sirdev_set_dtr_rts(dev, TRUE, TRUE);	/* Sleep a minimum of 15 us */	udelay(MIN_DELAY);	/* This dongles speed defaults to 115200 bps */	dev->speed = 115200;	return 0;}MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");MODULE_DESCRIPTION("Parallax Litelink dongle driver");	MODULE_LICENSE("GPL");MODULE_ALIAS("irda-dongle-5"); /* IRDA_LITELINK_DONGLE *//* * Function init_module (void) * *    Initialize Litelink module * */module_init(litelink_sir_init);/* * Function cleanup_module (void) * *    Cleanup Litelink module * */module_exit(litelink_sir_cleanup);