Hi,
While I was looking at dongle drivers, I created a driver for
the OLD Belkin SmartBeam dongle. I can claim that this is the simplest
and dumbest dongle driver ever written ;-)
Read source comments for details...
Dag, would you be kind enough to stuff that in your next IrDA
release ?
Thanks...
Jean
-------------------------------------------------------
/*********************************************************************
*
* Filename: old_belkin.c
* Version: 1.1
* Description: Driver for the Belkin (old) SmartBeam dongle
* Status: Experimental...
* Author: Jean Tourrilhes <[EMAIL PROTECTED]>
* Created at: 22/11/99
* Modified at:
* Modified by: Dag Brattli <[EMAIL PROTECTED]>
*
* 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>
/*
* Belkin is selling a dongle called the SmartBeam.
* In fact, there is two hardware version of this dongle, of course with
* the same name and looking the exactly same (grrr...).
* I guess that I've got the old one, because inside I don't have
* a jumper for IrDA/ASK...
*
* As far as I can make it from info on their web site, the old dongle
* support only 9600 b/s, which make our life much simpler as far as
* the driver is concerned, but you might not like it very much ;-)
* The new SmartBeam does 115 kb/s, and I've not tested it...
*
* Belkin claim that the correct driver for the old dongle (in Windows)
* is the generic Parallax 9500a driver, but the Linux LiteLink driver
* fails for me (probably because Linux-IrDA doesn't rate fallback),
* so I created this really dumb driver...
*
* In fact, this driver doesn't do much. The only thing it does is to
* prevent Linux-IrDA to use any other speed than 9600 b/s ;-) This
* driver is called "old_belkin" so that when the new SmartBeam is supported
* its driver can be called "belkin" instead of "new_belkin".
*
* Note : this driver was written without any info/help from Belkin,
* so a lot of info here might be totally wrong. Blame me ;-)
*/
/* Let's guess */
#define MIN_DELAY 25 /* 15 us, but wait a little more to be sure */
static void old_belkin_open(dongle_t *self, struct qos_info *qos);
static void old_belkin_close(dongle_t *self);
static int old_belkin_change_speed(struct irda_task *task);
static int old_belkin_reset(struct irda_task *task);
/* These are the baudrates supported */
static __u32 baud_rates[] = { 9600 };
static struct dongle_reg dongle = {
Q_NULL,
IRDA_OLD_BELKIN_DONGLE,
old_belkin_open,
old_belkin_close,
old_belkin_reset,
old_belkin_change_speed,
};
int __init old_belkin_init(void)
{
return irda_device_register_dongle(&dongle);
}
void old_belkin_cleanup(void)
{
irda_device_unregister_dongle(&dongle);
}
static void old_belkin_open(dongle_t *self, struct qos_info *qos)
{
/* Not too fast, please... */
qos->baud_rate.bits &= IR_9600;
/* Needs at least 10 ms (totally wild guess, can do probably better) */
qos->min_turn_time.bits &= 0x01;
MOD_INC_USE_COUNT;
}
static void old_belkin_close(dongle_t *self)
{
/* Power off dongle */
self->set_dtr_rts(self->dev, FALSE, FALSE);
MOD_DEC_USE_COUNT;
}
/*
* Function old_belkin_change_speed (task)
*
* With only one speed available, not much to do...
*/
static int old_belkin_change_speed(struct irda_task *task)
{
irda_task_next_state(task, IRDA_TASK_DONE);
return 0;
}
/*
* Function old_belkin_reset (task)
*
* Reset the Old-Belkin type dongle.
*
*/
static int old_belkin_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);
/* This dongles speed "defaults" to 9600 bps ;-) */
self->speed = 9600;
irda_task_next_state(task, IRDA_TASK_DONE);
return 0;
}
#ifdef MODULE
MODULE_AUTHOR("Dag Brattli <[EMAIL PROTECTED]>");
MODULE_DESCRIPTION("Belkin (old) SmartBeam dongle driver");
/*
* Function init_module (void)
*
* Initialize Old-Belkin module
*
*/
int init_module(void)
{
return old_belkin_init();
}
/*
* Function cleanup_module (void)
*
* Cleanup Old-Belkin module
*
*/
void cleanup_module(void)
{
old_belkin_cleanup();
}
#endif /* MODULE */
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