path: root/drivers/serial/jsm/jsm_tty.c

/************************************************************************
 * Copyright 2003 Digi International (www.digi.com)
 *
 * Copyright (C) 2004 IBM Corporation. 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, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; 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.
 *
 * Contact Information:
 * Scott H Kilau <Scott_Kilau@digi.com>
 * Wendy Xiong   <wendyx@us.ltcfwd.linux.ibm.com>
 *
 ***********************************************************************/
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_reg.h>
#include <linux/delay.h>	/* For udelay */
#include <linux/pci.h>

#include "jsm.h"

static inline int jsm_get_mstat(struct jsm_channel *ch)
{
	unsigned char mstat;
	unsigned result;

	jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "start\n");

	mstat = (ch->ch_mostat | ch->ch_mistat);

	result = 0;

	if (mstat & UART_MCR_DTR)
		result |= TIOCM_DTR;
	if (mstat & UART_MCR_RTS)
		result |= TIOCM_RTS;
	if (mstat & UART_MSR_CTS)
		result |= TIOCM_CTS;
	if (mstat & UART_MSR_DSR)
		result |= TIOCM_DSR;
	if (mstat & UART_MSR_RI)
		result |= TIOCM_RI;
	if (mstat & UART_MSR_DCD)
		result |= TIOCM_CD;

	jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n");
	return result;
}

static unsigned int jsm_tty_tx_empty(struct uart_port *port)
{
	return TIOCSER_TEMT;
}

/*
 * Return modem signals to ld.
 */
static unsigned int jsm_tty_get_mctrl(struct uart_port *port)
{
	int result;
	struct jsm_channel *channel = (struct jsm_channel *)port;

	jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n");

	result = jsm_get_mstat(channel);

	if (result < 0)
		return -ENXIO;

	jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n");

	return result;
}

/*
 * jsm_set_modem_info()
 *
 * Set modem signals, called by ld.
 */
static void jsm_tty_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
	struct jsm_channel *channel = (struct jsm_channel *)port;

	jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n");

	if (mctrl & TIOCM_RTS)
		channel->ch_mostat |= UART_MCR_RTS;
	else
		channel->ch_mostat &= ~UART_MCR_RTS;

	if (mctrl & TIOCM_DTR)
		channel->ch_mostat |= UART_MCR_DTR;
	else
		channel->ch_mostat &= ~UART_MCR_DTR;

	channel->ch_bd->bd_ops->assert_modem_signals(channel);

	jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n");
	udelay(10);
}

static void jsm_tty_start_tx(struct uart_port *port, unsigned int tty_start)
{
	struct jsm_channel *channel = (struct jsm_channel *)port;

	jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n");

	channel->ch_flags &= ~(CH_STOP);
	jsm_tty_write(port);

	jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n");
}

static void jsm_tty_stop_tx(struct uart_port *port, unsigned int tty_stop)
{
	struct jsm_channel *channel = (struct jsm_channel *)port;

	jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n");

	channel->ch_flags |= (CH_STOP);

	jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n");
}

static void jsm_tty_send_xchar(struct uart_port *port, char ch)
{
	unsigned