/*********************************************************************
*
* Filename: girbil.c
* Version: 1.2
* 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: Fri Dec 17 09:13:20 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/init.h>
#include <net/irda/irda.h>
#include <net/irda/irda_device.h>
static int girbil_reset(struct irda_task *task);
static void girbil_open(dongle_t *self, struct qos_info *qos);
static void girbil_close(dongle_t *self);
static int girbil_change_speed(struct irda_task *task);
/* 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_reg dongle = {
.type = IRDA_GIRBIL_DONGLE,
.open = girbil_open,
.close = girbil_close,
.reset = girbil_reset,
.change_speed = girbil_change_speed,
.owner = THIS_MODULE,
};
static int __init girbil_init(void)
{
return irda_device_register_dongle(&dongle);
}
static void __exit girbil_cleanup(void)
{
irda_device_unregister_dongle(&dongle);
}
static void girbil_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 = 0x03;
}
static void girbil_close(dongle_t *self)
{
/* Power off dongle */
self->set_dtr_rts(self->dev, FALSE, FALSE);
}
/*
* Function girbil_change_speed (dev, speed)
*
* Set the speed for the Girbil type dongle.
*
*/
static int girbil_change_speed(struct irda_task *task)
{
dongle_t *self = (dongle_t *) task->instance;
__u32 speed = (__u32) task->param;
__u8 control[2];
int ret = 0;
self->speed_task = task;
switch (task->state) {
case IRDA_TASK_INIT:
/* Need to reset the dongle and go to 9600 bps before
programming */
if (irda_task_execute(self, girbil_reset, NULL, task,
(void *) speed))
{
/* Dongle need more time to reset */
irda_task_next_state(task, IRDA_TASK_CHILD_WAIT);
/* Give reset 1 sec to finish */
ret = msecs_to_jiffies(1000);
}
break;
case IRDA_TASK_CHILD_WAIT:
IRDA_WARNING("%s(), resetting dongle timed out!\n",
__FUNCTION__);
ret = -1;
break;
case IRDA_TASK_CHILD_DONE:
/* Set DTR and Clear RTS to enter command mode */
self->set_dtr_rts(self->dev, FALSE, TRUE);
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;
/* Write control bytes */
self->write(self->dev, control, 2);
irda_task_next_state(task, IRDA_TASK_WAIT);
ret = msecs_to_jiffies(100);
break;
case IRDA_TASK_WAIT:
/* Go back to normal mode */
self->set_dtr_rts(self->dev, TRUE, TRUE);
irda_task_next_state(task, IRDA_TASK_DONE);
self->speed_task = NULL;
break;
default:
IRDA_ERROR("%s(), unknown state %d\n",
__FUNCTION__, task->state);
irda_task_next_state(task, IRDA_TASK_DONE);
self->speed_task = NULL;
ret = -1;
break;
}
return ret;
}
/*
* Function girbil_reset (driver)
*
* This function resets the girbil dongle.
*
* Algorithm:
* 0. set RTS, and wait at least 5 ms
* 1. clear RTS
*/
static int girbil_reset(struct irda_task *task)
{
dongle_t *self = (dongle_t *) task->instance;
__u8 control = GIRBIL_TXEN | GIRBIL_RXEN;
int ret = 0;
self->reset_task = task;
switch (task->state) {
case IRDA_TASK_INIT:
/* Reset dongle */
self->set_dtr_rts(self->dev, TRUE, FALSE);
irda_task_next_state(task, IRDA_TASK_WAIT1);
/* Sleep at least 5 ms */
ret = msecs_to_jiffies(20);
break;
case IRDA_TASK_WAIT1:
/* Set DTR and clear RTS to enter command mode */
self->set_dtr_rts(self->dev, FALSE, TRUE);
irda_task_next_state(task, IRDA_TASK_WAIT2);
ret = msecs_to_jiffies(20);
break;
case IRDA_TASK_WAIT2:
/* Write control byte */
self->write(self->dev, &control, 1);
irda_task_next_state(task, IRDA_TASK_WAIT3);
ret = msecs_to_jiffies(20);
break;
case IRDA_TASK_WAIT3:
/* Go back to normal mode */
self->set_dtr_rts(self->dev, TRUE, TRUE);
irda_task_next_state(task, IRDA_TASK_DONE);
self->reset_task = NULL;
break;
default:
IRDA_ERROR("%s(), unknown state %d\n",
__FUNCTION__, task->state);
irda_task_next_state(task, IRDA_TASK_DONE);
self->reset_task = NULL;
ret = -1;
break;
}
return ret;
}
MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
MODULE_DESCRIPTION("Greenwich GIrBIL dongle driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("irda-dongle-4"); /* IRDA_GIRBIL_DONGLE */
/*
* Function init_module (void)
*
* Initialize Girbil module
*
*/
module_init(girbil_init);
/*
* Function cleanup_module (void)
*
* Cleanup Girbil module
*
*/
module_exit(girbil_cleanup);
