/********************************************************************* *                 * 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 *      ********************************************************************/#include <linux/module.h>#include <linux/delay.h>#include <linux/tty.h>#include <linux/sched.h>#include <linux/init.h>#include <net/irda/irda.h>#include <net/irda/irmod.h>#include <net/irda/irda_device.h>#define MIN_DELAY 25      /* 15 us, but wait a little more to be sure */#define MAX_DELAY 10000   /* 1 ms */static void litelink_open(dongle_t *self, struct qos_info *qos);static void litelink_close(dongle_t *self);static int  litelink_change_speed(struct irda_task *task);static int  litelink_reset(struct irda_task *task);/* These are the baudrates supported */static __u32 baud_rates[] = { 115200, 57600, 38400, 19200, 9600 };static struct dongle_reg dongle = {	Q_NULL,	IRDA_LITELINK_DONGLE,	litelink_open,	litelink_close,	litelink_reset,	litelink_change_speed,};int __init litelink_init(void){	return irda_device_register_dongle(&dongle);}void litelink_cleanup(void){	irda_device_unregister_dongle(&dongle);}static void litelink_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 = 0x7f; /* Needs 0.01 ms */	MOD_INC_USE_COUNT;}static void litelink_close(dongle_t *self){	/* Power off dongle */	self->set_dtr_rts(self->dev, FALSE, FALSE);	MOD_DEC_USE_COUNT;}/* * 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 irda_task *task){	dongle_t *self = (dongle_t *) task->instance;	__u32 speed = (__u32) task->param;        int i;		/* Clear RTS to reset dongle */	self->set_dtr_rts(self->dev, TRUE, FALSE);	/* Sleep a minimum of 15 us */	udelay(MIN_DELAY);	/* Go back to normal mode */	self->set_dtr_rts(self->dev, TRUE, TRUE);		/* Sleep a minimum of 15 us */	udelay(MIN_DELAY);		/* Cycle through avaiable baudrates until we reach the correct one */	for (i=0; i<5 && baud_rates[i] != speed; i++) {		/* Set DTR, clear RTS */		self->set_dtr_rts(self->dev, FALSE, TRUE);				/* Sleep a minimum of 15 us */		udelay(MIN_DELAY);				/* Set DTR, Set RTS */		self->set_dtr_rts(self->dev, TRUE, TRUE);				/* Sleep a minimum of 15 us */		udelay(MIN_DELAY);        }	irda_task_next_state(task, IRDA_TASK_DONE);	return 0;}/* * Function litelink_reset (task) * *      Reset the Litelink type dongle. * */static int litelink_reset(struct irda_task *task){	dongle_t *self = (dongle_t *) task->instance;	/* Power on dongle */	self->set_dtr_rts(self->dev, TRUE, TRUE);	/* Sleep a minimum of 15 us */	udelay(MIN_DELAY);	/* Clear RTS to reset dongle */	self->set_dtr_rts(self->dev, TRUE, FALSE);	/* Sleep a minimum of 15 us */	udelay(MIN_DELAY);	/* Go back to normal mode */	self->set_dtr_rts(self->dev, TRUE, TRUE);		/* Sleep a minimum of 15 us */	udelay(MIN_DELAY);	/* This dongles speed defaults to 115200 bps */	self->speed = 115200;	irda_task_next_state(task, IRDA_TASK_DONE);	return 0;}#ifdef MODULEMODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");MODULE_DESCRIPTION("Parallax Litelink dongle driver");	MODULE_LICENSE("GPL");		/* * Function init_module (void) * *    Initialize Litelink module * */int init_module(void){	return litelink_init();}/* * Function cleanup_module (void) * *    Cleanup Litelink module * */void cleanup_module(void){	litelink_cleanup();}#endif /* MODULE */