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/*********************************************************************
*
* Filename: tekram.c
* Version: 1.2
* Description: Implementation of the Tekram IrMate IR-210B dongle
* Status: Experimental.
* Author: Dag Brattli <dagb@cs.uit.no>
* Created at: Wed Oct 21 20:02:35 1998
* Modified at: Fri Dec 17 09:13:09 1999
* Modified by: Dag Brattli <dagb@cs.uit.no>
*
* Copyright (c) 1998-1999 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 Tromsų 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>
static void tekram_open(dongle_t *self, struct qos_info *qos);
static void tekram_close(dongle_t *self);
static int tekram_change_speed(struct irda_task *task);
static int tekram_reset(struct irda_task *task);
#define TEKRAM_115200 0x00
#define TEKRAM_57600 0x01
#define TEKRAM_38400 0x02
#define TEKRAM_19200 0x03
#define TEKRAM_9600 0x04
#define TEKRAM_PW 0x10 /* Pulse select bit */
static struct dongle_reg dongle = {
Q_NULL,
IRDA_TEKRAM_DONGLE,
tekram_open,
tekram_close,
tekram_reset,
tekram_change_speed,
};
int __init tekram_init(void)
{
return irda_device_register_dongle(&dongle);
}
void tekram_cleanup(void)
{
irda_device_unregister_dongle(&dongle);
}
static void tekram_open(dongle_t *self, struct qos_info *qos)
{
IRDA_DEBUG(2, __FUNCTION__ "()\n");
qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
qos->min_turn_time.bits = 0x01; /* Needs at least 10 ms */
irda_qos_bits_to_value(qos);
MOD_INC_USE_COUNT;
}
static void tekram_close(dongle_t *self)
{
IRDA_DEBUG(2, __FUNCTION__ "()\n");
/* Power off dongle */
self->set_dtr_rts(self->dev, FALSE, FALSE);
if (self->reset_task)
irda_task_delete(self->reset_task);
if (self->speed_task)
irda_task_delete(self->speed_task);
MOD_DEC_USE_COUNT;
}
/*
* Function tekram_change_speed (dev, state, speed)
*
* Set the speed for the Tekram IRMate 210 type dongle. Warning, this
* function must be called with a process context!
*
* Algorithm
* 1. clear DTR
* 2. set RTS, and wait at least 7 us
* 3. send Control Byte to the IR-210 through TXD to set new baud rate
* wait until the stop bit of Control Byte is sent (for 9600 baud rate,
* it takes about 100 msec)
* 5. clear RTS (return to NORMAL Operation)
* 6. wait at least 50 us, new setting (baud rate, etc) takes effect here
* after
*/
static int tekram_change_speed(struct irda_task *task)
{
dongle_t *self = (dongle_t *) task->instance;
__u32 speed = (__u32) task->param;
__u8 byte;
int ret = 0;
IRDA_DEBUG(2, __FUNCTION__ "()\n");
ASSERT(task != NULL, return -1;);
if (self->speed_task && self->speed_task != task) {
IRDA_DEBUG(0, __FUNCTION__ "(), busy!\n");
return MSECS_TO_JIFFIES(10);
} else
self->speed_task = task;
switch (speed) {
default:
case 9600:
byte = TEKRAM_PW|TEKRAM_9600;
break;
case 19200:
byte = TEKRAM_PW|TEKRAM_19200;
break;
case 38400:
byte = TEKRAM_PW|TEKRAM_38400;
break;
case 57600:
byte = TEKRAM_PW|TEKRAM_57600;
break;
case 115200:
byte = TEKRAM_115200;
break;
}
switch (task->state) {
case IRDA_TASK_INIT:
case IRDA_TASK_CHILD_INIT:
/*
* Need to reset the dongle and go to 9600 bps before
* programming
*/
if (irda_task_execute(self, tekram_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);
} else
irda_task_next_state(task, IRDA_TASK_CHILD_DONE);
break;
case IRDA_TASK_CHILD_WAIT:
WARNING(__FUNCTION__ "(), resetting dongle timed out!\n");
ret = -1;
break;
case IRDA_TASK_CHILD_DONE:
/* Set DTR, Clear RTS */
self->set_dtr_rts(self->dev, TRUE, FALSE);
/* Wait at least 7us */
udelay(14);
/* Write control byte */
self->write(self->dev, &byte, 1);
irda_task_next_state(task, IRDA_TASK_WAIT);
/* Wait at least 100 ms */
ret = MSECS_TO_JIFFIES(150);
break;
case IRDA_TASK_WAIT:
/* Set DTR, Set RTS */
self->set_dtr_rts(self->dev, TRUE, TRUE);
irda_task_next_state(task, IRDA_TASK_DONE);
self->speed_task = NULL;
break;
default:
ERROR(__FUNCTION__ "(), unknown state %d\n", task->state);
irda_task_next_state(task, IRDA_TASK_DONE);
self->speed_task = NULL;
ret = -1;
break;
}
return ret;
}
/*
* Function tekram_reset (driver)
*
* This function resets the tekram dongle. Warning, this function
* must be called with a process context!!
*
* Algorithm:
* 0. Clear RTS and DTR, and wait 50 ms (power off the IR-210 )
* 1. clear RTS
* 2. set DTR, and wait at least 1 ms
* 3. clear DTR to SPACE state, wait at least 50 us for further
* operation
*/
int tekram_reset(struct irda_task *task)
{
dongle_t *self = (dongle_t *) task->instance;
int ret = 0;
IRDA_DEBUG(2, __FUNCTION__ "()\n");
ASSERT(task != NULL, return -1;);
if (self->reset_task && self->reset_task != task) {
IRDA_DEBUG(0, __FUNCTION__ "(), busy!\n");
return MSECS_TO_JIFFIES(10);
} else
self->reset_task = task;
/* Power off dongle */
//self->set_dtr_rts(self->dev, FALSE, FALSE);
self->set_dtr_rts(self->dev, TRUE, TRUE);
switch (task->state) {
case IRDA_TASK_INIT:
irda_task_next_state(task, IRDA_TASK_WAIT1);
/* Sleep 50 ms */
ret = MSECS_TO_JIFFIES(50);
break;
case IRDA_TASK_WAIT1:
/* Clear DTR, Set RTS */
self->set_dtr_rts(self->dev, FALSE, TRUE);
irda_task_next_state(task, IRDA_TASK_WAIT2);
/* Should sleep 1 ms */
ret = MSECS_TO_JIFFIES(1);
break;
case IRDA_TASK_WAIT2:
/* Set DTR, Set RTS */
self->set_dtr_rts(self->dev, TRUE, TRUE);
/* Wait at least 50 us */
udelay(75);
irda_task_next_state(task, IRDA_TASK_DONE);
self->reset_task = NULL;
break;
default:
ERROR(__FUNCTION__ "(), unknown state %d\n", task->state);
irda_task_next_state(task, IRDA_TASK_DONE);
self->reset_task = NULL;
ret = -1;
}
return ret;
}
#ifdef MODULE
MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
MODULE_DESCRIPTION("Tekram IrMate IR-210B dongle driver");
MODULE_LICENSE("GPL");
/*
* Function init_module (void)
*
* Initialize Tekram module
*
*/
int init_module(void)
{
return tekram_init();
}
/*
* Function cleanup_module (void)
*
* Cleanup Tekram module
*
*/
void cleanup_module(void)
{
tekram_cleanup();
}
#endif /* MODULE */
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