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linux-sg2042/drivers/net/irda/ma600.c

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/*********************************************************************
*
* Filename: ma600.c
* Version: 0.1
* Description: Implementation of the MA600 dongle
* Status: Experimental.
* Author: Leung <95Etwl@alumni.ee.ust.hk> http://www.engsvr.ust/~eetwl95
* Created at: Sat Jun 10 20:02:35 2000
* Modified at:
* Modified by:
*
* Note: very thanks to Mr. Maru Wang <maru@mobileaction.com.tw> for providing
* information on the MA600 dongle
*
* Copyright (c) 2000 Leung, 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
*
********************************************************************/
/* define this macro for release version */
//#define NDEBUG
#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>
#ifndef NDEBUG
#undef IRDA_DEBUG
#define IRDA_DEBUG(n, args...) (printk(KERN_DEBUG args))
#undef ASSERT
#define ASSERT(expr, func) \
if(!(expr)) { \
printk( "Assertion failed! %s,%s,%s,line=%d\n",\
#expr,__FILE__,__FUNCTION__,__LINE__); \
func}
#endif
/* convert hex value to ascii hex */
static const char hexTbl[] = "0123456789ABCDEF";
static void ma600_open(dongle_t *self, struct qos_info *qos);
static void ma600_close(dongle_t *self);
static int ma600_change_speed(struct irda_task *task);
static int ma600_reset(struct irda_task *task);
/* control byte for MA600 */
#define MA600_9600 0x00
#define MA600_19200 0x01
#define MA600_38400 0x02
#define MA600_57600 0x03
#define MA600_115200 0x04
#define MA600_DEV_ID1 0x05
#define MA600_DEV_ID2 0x06
#define MA600_2400 0x08
static struct dongle_reg dongle = {
.type = IRDA_MA600_DONGLE,
.open = ma600_open,
.close = ma600_close,
.reset = ma600_reset,
.change_speed = ma600_change_speed,
.owner = THIS_MODULE,
};
static int __init ma600_init(void)
{
IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
return irda_device_register_dongle(&dongle);
}
static void __exit ma600_cleanup(void)
{
IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
irda_device_unregister_dongle(&dongle);
}
/*
Power on:
(0) Clear RTS and DTR for 1 second
(1) Set RTS and DTR for 1 second
(2) 9600 bps now
Note: assume RTS, DTR are clear before
*/
static void ma600_open(dongle_t *self, struct qos_info *qos)
{
IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
qos->baud_rate.bits &= IR_2400|IR_9600|IR_19200|IR_38400
|IR_57600|IR_115200;
qos->min_turn_time.bits = 0x01; /* Needs at least 1 ms */
irda_qos_bits_to_value(qos);
//self->set_dtr_rts(self->dev, FALSE, FALSE);
// should wait 1 second
self->set_dtr_rts(self->dev, TRUE, TRUE);
// should wait 1 second
}
static void ma600_close(dongle_t *self)
{
IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
/* Power off dongle */
self->set_dtr_rts(self->dev, FALSE, FALSE);
}
static __u8 get_control_byte(__u32 speed)
{
__u8 byte;
switch (speed) {
default:
case 115200:
byte = MA600_115200;
break;
case 57600:
byte = MA600_57600;
break;
case 38400:
byte = MA600_38400;
break;
case 19200:
byte = MA600_19200;
break;
case 9600:
byte = MA600_9600;
break;
case 2400:
byte = MA600_2400;
break;
}
return byte;
}
/*
* Function ma600_change_speed (dev, state, speed)
*
* Set the speed for the MA600 type dongle. Warning, this
* function must be called with a process context!
*
* Algorithm
* 1. Reset
* 2. clear RTS, set DTR and wait for 1ms
* 3. send Control Byte to the MA600 through TXD to set new baud rate
* wait until the stop bit of Control Byte is sent (for 9600 baud rate,
* it takes about 10 msec)
* 4. set RTS, set DTR (return to NORMAL Operation)
* 5. wait at least 10 ms, new setting (baud rate, etc) takes effect here
* after
*/
static int ma600_change_speed(struct irda_task *task)
{
dongle_t *self = (dongle_t *) task->instance;
__u32 speed = (__u32) task->param;
static __u8 byte;
__u8 byte_echo;
int ret = 0;
IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
ASSERT(task != NULL, return -1;);
if (self->speed_task && self->speed_task != task) {
IRDA_DEBUG(0, "%s(), busy!\n", __FUNCTION__);
return msecs_to_jiffies(10);
} else {
self->speed_task = task;
}
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, ma600_reset, NULL, task,
(void *) speed)) {
/* Dongle need more time to reset */
irda_task_next_state(task, IRDA_TASK_CHILD_WAIT);
/* give 1 second to finish */
ret = msecs_to_jiffies(1000);
} else {
irda_task_next_state(task, IRDA_TASK_CHILD_DONE);
}
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, Clear RTS */
self->set_dtr_rts(self->dev, TRUE, FALSE);
ret = msecs_to_jiffies(1); /* Sleep 1 ms */
irda_task_next_state(task, IRDA_TASK_WAIT);
break;
case IRDA_TASK_WAIT:
speed = (__u32) task->param;
byte = get_control_byte(speed);
/* Write control byte */
self->write(self->dev, &byte, sizeof(byte));
irda_task_next_state(task, IRDA_TASK_WAIT1);
/* Wait at least 10 ms */
ret = msecs_to_jiffies(15);
break;
case IRDA_TASK_WAIT1:
/* Read control byte echo */
self->read(self->dev, &byte_echo, sizeof(byte_echo));
if(byte != byte_echo) {
/* if control byte != echo, I don't know what to do */
printk(KERN_WARNING "%s() control byte written != read!\n", __FUNCTION__);
printk(KERN_WARNING "control byte = 0x%c%c\n",
hexTbl[(byte>>4)&0x0f], hexTbl[byte&0x0f]);
printk(KERN_WARNING "byte echo = 0x%c%c\n",
hexTbl[(byte_echo>>4) & 0x0f],
hexTbl[byte_echo & 0x0f]);
#ifndef NDEBUG
} else {
IRDA_DEBUG(2, "%s() control byte write read OK\n", __FUNCTION__);
#endif
}
/* Set DTR, Set RTS */
self->set_dtr_rts(self->dev, TRUE, TRUE);
irda_task_next_state(task, IRDA_TASK_WAIT2);
/* Wait at least 10 ms */
ret = msecs_to_jiffies(10);
break;
case IRDA_TASK_WAIT2:
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 ma600_reset (driver)
*
* This function resets the ma600 dongle. Warning, this function
* must be called with a process context!!
*
* Algorithm:
* 0. DTR=0, RTS=1 and wait 10 ms
* 1. DTR=1, RTS=1 and wait 10 ms
* 2. 9600 bps now
*/
int ma600_reset(struct irda_task *task)
{
dongle_t *self = (dongle_t *) task->instance;
int ret = 0;
IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
ASSERT(task != NULL, return -1;);
if (self->reset_task && self->reset_task != task) {
IRDA_DEBUG(0, "%s(), busy!\n", __FUNCTION__);
return msecs_to_jiffies(10);
} else
self->reset_task = task;
switch (task->state) {
case IRDA_TASK_INIT:
/* Clear DTR and Set RTS */
self->set_dtr_rts(self->dev, FALSE, TRUE);
irda_task_next_state(task, IRDA_TASK_WAIT1);
ret = msecs_to_jiffies(10); /* Sleep 10 ms */
break;
case IRDA_TASK_WAIT1:
/* Set DTR and RTS */
self->set_dtr_rts(self->dev, TRUE, TRUE);
irda_task_next_state(task, IRDA_TASK_WAIT2);
ret = msecs_to_jiffies(10); /* Sleep 10 ms */
break;
case IRDA_TASK_WAIT2:
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;
}
return ret;
}
MODULE_AUTHOR("Leung <95Etwl@alumni.ee.ust.hk> http://www.engsvr.ust/~eetwl95");
MODULE_DESCRIPTION("MA600 dongle driver version 0.1");
MODULE_LICENSE("GPL");
MODULE_ALIAS("irda-dongle-11"); /* IRDA_MA600_DONGLE */
/*
* Function init_module (void)
*
* Initialize MA600 module
*
*/
module_init(ma600_init);
/*
* Function cleanup_module (void)
*
* Cleanup MA600 module
*
*/
module_exit(ma600_cleanup);
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