/*********************************************************************
*
* sir_dev.c: irda sir network device
*
* Copyright (c) 2002 Martin Diehl
*
* 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.
*
********************************************************************/
#include <linux/hardirq.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <net/irda/irda.h>
#include <net/irda/wrapper.h>
#include <net/irda/irda_device.h>
#include "sir-dev.h"
static struct workqueue_struct *irda_sir_wq;
/* STATE MACHINE */
/* substate handler of the config-fsm to handle the cases where we want
* to wait for transmit completion before changing the port configuration
*/
static int sirdev_tx_complete_fsm(struct sir_dev *dev)
{
struct sir_fsm *fsm = &dev->fsm;
unsigned next_state, delay;
unsigned bytes_left;
do {
next_state = fsm->substate; /* default: stay in current substate */
delay = 0;
switch(fsm->substate) {
case SIRDEV_STATE_WAIT_XMIT:
if (dev->drv->chars_in_buffer)
bytes_left = dev->drv->chars_in_buffer(dev);
else
bytes_left = 0;
if (!bytes_left) {
next_state = SIRDEV_STATE_WAIT_UNTIL_SENT;
break;
}
if (dev->speed > 115200)
delay = (bytes_left*8*10000) / (dev->speed/100);
else if (dev->speed > 0)
delay = (bytes_left*10*10000) / (dev->speed/100);
else
delay = 0;
/* expected delay (usec) until remaining bytes are sent */
if (delay < 100) {
udelay(delay);
delay = 0;
break;
}
/* sleep some longer delay (msec) */
delay = (delay+999) / 1000;
break;
case SIRDEV_STATE_WAIT_UNTIL_SENT:
/* block until underlaying hardware buffer are empty */
if (dev->drv->wait_until_sent)
dev->drv->wait_until_sent(dev);
next_state = SIRDEV_STATE_TX_DONE;
break;
case SIRDEV_STATE_TX_DONE:
return 0;
default:
net_err_ratelimited("%s - undefined state\n", __func__);
return -EINVAL;
}
fsm->substate = next_state;
} while (delay == 0);
return delay;
}
/*
* Function sirdev_config_fsm
*
* State machine to handle the configuration of the device (and attached dongle, if any).
* This handler is scheduled for execution in kIrDAd context, so we can sleep.
* however, kIrDAd is shared by all sir_dev devices so we better don't sleep there too
* long. Instead, for longer delays we start a timer to reschedule us later.
* On entry, fsm->sem is always locked and the netdev xmit queue stopped.
* Both must be unlocked/restarted on completion - but only on final exit.
*/
static void sirdev_config_fsm(struct work_struct *work)
{
struct sir_dev *dev = container_of(work, struct sir_dev, fsm.work.work);
struct sir_fsm *fsm = &dev->fsm;
int next_state;
int ret = -1;
unsigned delay;
pr_debug("%s(), <%ld>\n", __func__, jiffies);
do {
pr_debug("%s - state=0x%04x / substate=0x%04x\n",
__func__, fsm->state, fsm->substate);
next_state = fsm->state;
delay = 0;
switch(fsm->state) {
case SIRDEV_STATE_DONGLE_OPEN:
if (dev->dongle_drv != NULL) {
ret = sirdev_put_dongle(dev);
if (ret) {
fsm->result = -EINVAL;
next_state = SIRDEV_STATE_ERROR;
break;
}
}
/* Initialize dongle */
ret = sirdev_get_dongle(dev, fsm->param);
if (ret) {
fsm->result = ret;
next_state = SIRDEV_STATE_ERROR;
break;
}
/* Dongles are powered through the modem control lines which
* were just set during open. Before resetting, let's wait for
* the power to stabilize. This is what some dongle drivers did
* in open before, while others didn't - should be safe anyway.
*/
delay = 50;
fsm->substate = SIRDEV_STATE_DONGLE_RESET;
next_state = SIRDEV_STATE_DONGLE_RESET;
fsm->param = 9600;
break;
case SIRDEV_STATE_DONGLE_CLOSE:
/* shouldn't we just treat this as success=? */
if (dev->dongle_drv == NULL) {
fsm->result = -EINVAL;
next_state = SIRDEV_STATE_ERROR;
break;
}
ret = sirdev_put_dongle(dev);
if (ret) {
fsm->result = ret;
next_state = SIRDEV_STATE_ERROR;
break;
}
next_state = SIRDEV_STATE_DONE;
break;
case