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/*********************************************************************
*
* Filename: girbil.c
* Version: 1.1
* 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: Tue Jun 1 08:47:41 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/sched.h>
#include <linux/init.h>
#include <net/irda/irda.h>
#include <net/irda/irmod.h>
#include <net/irda/irda_device.h>
#include <net/irda/irtty.h>
#include <net/irda/dongle.h>
static void girbil_reset(struct irda_device *dev);
static void girbil_open(struct irda_device *dev, int type);
static void girbil_close(struct irda_device *dev);
static void girbil_change_speed(struct irda_device *dev, int baud);
static void girbil_init_qos(struct irda_device *idev, struct qos_info *qos);
/* 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 dongle = {
GIRBIL_DONGLE,
girbil_open,
girbil_close,
girbil_reset,
girbil_change_speed,
girbil_init_qos,
};
__initfunc(int girbil_init(void))
{
return irda_device_register_dongle(&dongle);
}
void girbil_cleanup(void)
{
irda_device_unregister_dongle(&dongle);
}
static void girbil_open(struct irda_device *idev, int type)
{
strcat(idev->description, " <-> girbil");
idev->io.dongle_id = type;
idev->flags |= IFF_DONGLE;
MOD_INC_USE_COUNT;
}
static void girbil_close(struct irda_device *idev)
{
/* Power off dongle */
irda_device_set_dtr_rts(idev, FALSE, FALSE);
MOD_DEC_USE_COUNT;
}
/*
* Function girbil_change_speed (dev, speed)
*
* Set the speed for the Girbil type dongle. Warning, this
* function must be called with a process context!
*
*/
static void girbil_change_speed(struct irda_device *idev, int speed)
{
__u8 control[2];
ASSERT(idev != NULL, return;);
ASSERT(idev->magic == IRDA_DEVICE_MAGIC, return;);
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;
/* Set DTR and Clear RTS to enter command mode */
irda_device_set_dtr_rts(idev, FALSE, TRUE);
/* Write control bytes */
irda_device_raw_write(idev, control, 2);
current->state = TASK_INTERRUPTIBLE;
schedule_timeout(2);
/* Go back to normal mode */
irda_device_set_dtr_rts(idev, TRUE, TRUE);
}
/*
* Function girbil_reset (driver)
*
* This function resets the girbil dongle. Warning, this function
* must be called with a process context!!
*
* Algorithm:
* 0. set RTS, and wait at least 5 ms
* 1. clear RTS
*/
void girbil_reset(struct irda_device *idev)
{
__u8 control = GIRBIL_TXEN | GIRBIL_RXEN;
ASSERT(idev != NULL, return;);
ASSERT(idev->magic == IRDA_DEVICE_MAGIC, return;);
/* Reset dongle */
irda_device_set_dtr_rts(idev, TRUE, FALSE);
/* Sleep at least 5 ms */
current->state = TASK_INTERRUPTIBLE;
schedule_timeout(MSECS_TO_JIFFIES(20));
/* Set DTR and clear RTS to enter command mode */
irda_device_set_dtr_rts(idev, FALSE, TRUE);
current->state = TASK_INTERRUPTIBLE;
schedule_timeout(MSECS_TO_JIFFIES(20));
/* Write control byte */
irda_device_raw_write(idev, &control, 1);
current->state = TASK_INTERRUPTIBLE;
schedule_timeout(MSECS_TO_JIFFIES(20));
/* Go back to normal mode */
irda_device_set_dtr_rts(idev, TRUE, TRUE);
/* Make sure the IrDA chip also goes to defalt speed */
if (idev->change_speed)
idev->change_speed(idev, 9600);
}
/*
* Function girbil_init_qos (qos)
*
* Initialize QoS capabilities
*
*/
static void girbil_init_qos(struct irda_device *idev, struct qos_info *qos)
{
qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
qos->min_turn_time.bits &= 0x03;
}
#ifdef MODULE
MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
MODULE_DESCRIPTION("Greenwich GIrBIL dongle driver");
/*
* Function init_module (void)
*
* Initialize Girbil module
*
*/
int init_module(void)
{
return girbil_init();
}
/*
* Function cleanup_module (void)
*
* Cleanup Girbil module
*
*/
void cleanup_module(void)
{
girbil_cleanup();
}
#endif /* MODULE */
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