251 lines
6.2 KiB
C
251 lines
6.2 KiB
C
/*********************************************************************
|
|
*
|
|
* 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);
|
|
|