net/irda/ircomm/ircomm_tty_ioctl.c

/*********************************************************************
 *
 * Filename:      ircomm_tty_ioctl.c
 * Version:
 * Description:
 * Status:        Experimental.
 * Author:        Dag Brattli <dagb@cs.uit.no>
 * Created at:    Thu Jun 10 14:39:09 1999
 * Modified at:   Wed Jan  5 14:45:43 2000
 * Modified by:   Dag Brattli <dagb@cs.uit.no>
 *
 *     Copyright (c) 1999-2000 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.
 *
 *     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, see <http://www.gnu.org/licenses/>.
 *
 ********************************************************************/

#include <linux/init.h>
#include <linux/fs.h>
#include <linux/termios.h>
#include <linux/tty.h>
#include <linux/serial.h>

#include <asm/uaccess.h>

#include <net/irda/irda.h>
#include <net/irda/irmod.h>

#include <net/irda/ircomm_core.h>
#include <net/irda/ircomm_param.h>
#include <net/irda/ircomm_tty_attach.h>
#include <net/irda/ircomm_tty.h>

#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))

/*
 * Function ircomm_tty_change_speed (driver)
 *
 *    Change speed of the driver. If the remote device is a DCE, then this
 *    should make it change the speed of its serial port
 */
static void ircomm_tty_change_speed(struct ircomm_tty_cb *self,
		struct tty_struct *tty)
{
	unsigned int cflag, cval;
	int baud;

	if (!self->ircomm)
		return;

	cflag = tty->termios.c_cflag;

	/*  byte size and parity */
	switch (cflag & CSIZE) {
	case CS5: cval = IRCOMM_WSIZE_5; break;
	case CS6: cval = IRCOMM_WSIZE_6; break;
	case CS7: cval = IRCOMM_WSIZE_7; break;
	case CS8: cval = IRCOMM_WSIZE_8; break;
	default:  cval = IRCOMM_WSIZE_5; break;
	}
	if (cflag & CSTOPB)
		cval |= IRCOMM_2_STOP_BIT;

	if (cflag & PARENB)
		cval |= IRCOMM_PARITY_ENABLE;
	if (!(cflag & PARODD))
		cval |= IRCOMM_PARITY_EVEN;

	/* Determine divisor based on baud rate */
	baud = tty_get_baud_rate(tty);
	if (!baud)
		baud = 9600;	/* B0 transition handled in rs_set_termios */

	self->settings.data_rate = baud;
	ircomm_param_request(self, IRCOMM_DATA_RATE, FALSE);

	/* CTS flow control flag and modem status interrupts */
	if (cflag & CRTSCTS) {
		self->port.flags |= ASYNC_CTS_FLOW;
		self->settings.flow_control |= IRCOMM_RTS_CTS_IN;
		/* This got me. Bummer. Jean II */
		if (self->service_type == IRCOMM_3_WIRE_RAW)
			net_warn_ratelimited("%s(), enabling RTS/CTS on link that doesn't support it (3-wire-raw)\n",
					     __func__);
	} else {
		self->port.flags &= ~ASYNC_CTS_FLOW;
		self->settings.flow_control &= ~IRCOMM_RTS_CTS_IN;
	}
	if (cflag & CLOCAL)
		self->port.flags &= ~ASYNC_CHECK_CD;
	else
		self->port.flags |= ASYNC_CHECK_CD;
#if 0
	/*
	 * Set up parity check flag
	 */

	if (I_INPCK(self->tty))
		driver->read_status_mask |= LSR_FE | LSR_PE;
	if (I_BRKINT(driver->tty) || I_PARMRK(driver->tty))
		driver->read_status_mask |= LSR_BI;

	/*
	 * Characters to ignore
	 */
	driver->ignore_status_mask = 0;
	if (I_IGNPAR(driver->tty))
		driver->ignore_status_mask |= LSR_PE | LSR_FE;

	if (I_IGNBRK(self->tty)) {
		self->ignore_status_mask |= LSR_BI;
		/*
		 * If we're ignore parity and break indicators, ignore
		 * overruns too. (For real raw support).
		 */
		if (I_IGNPAR(self->tty))
			self->ignore_status_mask |= LSR_OE;
	}
#endif
	self->settings.data_format = cval;

	ircomm_param_request(self, IRCOMM_DATA_FORMAT, FALSE);
	ircomm_param_request(self, IRCOMM_FLOW_CONTROL, TRUE);
}

/*
 * Function ircomm_tty_set_termios (tty, old_termios)
 *
 *    This routine allows the tty driver to be notified when device's
 *    termios settings have changed.  Note that a well-designed tty driver
 *    should be prepared to accept the case where old == NULL, and try to
 *    do something rational.
 */
void ircomm_tty_set_termios(struct tty_struct *tty,
			    struct ktermios *old_termios)
{
	struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
	unsigned int cflag = tty->termios.c_cflag;

	if ((cflag == old_termios->c_cflag) &&
	    (RELEVANT_IFLAG(tty->termios.c_iflag) ==
	     RELEVANT_IFLAG(old_termios->c_iflag)))
	{
		return;
	}

	ircomm_tty_change_speed(self, tty);

	/* Handle transition to B0 status */
	if ((old_termios->c_cflag & CBAUD) &&
	    !(cflag & CBAUD)) {
		self->settings.dte &= ~(IRCOMM_DTR|IRCOMM_RTS);
		ircomm_param_request(self, IRCOMM_DTE, TRUE);
	}

	/* Handle transition away from B0 status */
	if (!(old_termios->c_cflag & CBAUD) &&
	    (cflag & CBAUD)) {
		self->settings.dte |= IRCOMM_DTR;
		if (!(tty->termios.c_cflag & CRTSCTS) ||
		    !test_bit(TTY_THROTTLED, &tty->flags)) {
			self->settings.dte |= IRCOMM_RTS;
		}
		ircomm_param_request(self, IRCOMM_DTE, TRUE);
	}

	/* Handle turning off CRTSCTS */
	if ((old_termios->c_cflag & CRTSCTS) &&
	    !(tty->termios.c_cflag & CRTSCTS))
	{
		tty->hw_stopped = 0;
		ircomm_tty_start(tty);
	}
}

/*
 * Function ircomm_tty_tiocmget (tty)
 *
 *
 *
 */
int ircomm_tty_tiocmget(struct tty_struct *tty)
{
	struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
	unsigned int result;

	if (tty->flags & (1 << TTY_IO_ERROR))
		return -EIO;

	result =  ((self->settings.dte & IRCOMM_RTS) ? TIOCM_RTS : 0)
		| ((self->settings.dte & IRCOMM_DTR) ? TIOCM_DTR : 0)
		| ((self->settings.dce & IRCOMM_CD)  ? TIOCM_CAR : 0)
		| ((self->settings.dce & IRCOMM_RI)  ? TIOCM_RNG : 0)
		| ((self->settings.dce & IRCOMM_DSR) ? TIOCM_DSR : 0)
		| ((self->settings.dce & IRCOMM_CTS) ? TIOCM_CTS : 0);
	return result;
}

/*
 * Function ircomm_tty_tiocmset (tty, set, clear)
 *
 *
 *
 */
int ircomm_tty_tiocmset(struct tty_struct *tty,
			unsigned int set, unsigned int clear)
{
	struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;

	if (tty->flags & (1 << TTY_IO_ERROR))
		return -EIO;

	IRDA_ASSERT(self != NULL, return -1;);
	IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);

	if (set & TIOCM_RTS)
		self->settings.dte |= IRCOMM_RTS;
	if (set & TIOCM_DTR)
		self->settings.dte |= IRCOMM_DTR;

	if (clear & TIOCM_RTS)
		self->settings.dte &= ~IRCOMM_RTS;
	if (clear & TIOCM_DTR)
		self->settings.dte &= ~IRCOMM_DTR;

	if ((set|clear) & TIOCM_RTS)
		self->settings.dte |= IRCOMM_DELTA_RTS;
	if ((set|clear) & TIOCM_DTR)
		self->settings.dte |= IRCOMM_DELTA_DTR;

	ircomm_param_request(self, IRCOMM_DTE, TRUE);

	return 0;
}

/*
 * Function get_serial_info (driver, retinfo)
 *
 *
 *
 */
static int ircomm_tty_get_serial_info(struct ircomm_tty_cb *self,
				      struct serial_struct __user *retinfo)
{
	struct serial_struct info;

	if (!retinfo)
		return -EFAULT;

	memset(&info, 0, sizeof(info));
	info.line = self->line;
	info.flags = self->port.flags;
	info.baud_base = self->settings.data_rate;
	info.close_delay = self->port.close_delay;
	info.closing_wait = self->port.closing_wait;

	/* For compatibility  */
	info.type = PORT_16550A;
	info.port = 0;
	info.irq = 0;
	info.xmit_fifo_size = 0;
	info.hub6 = 0;
	info.custom_divisor = 0;

	if (copy_to_user(retinfo, &info, sizeof(*retinfo)))
		return -EFAULT;

	return 0;
}

/*
 * Function set_serial_info (driver, new_info)
 *
 *
 *
 */
static int ircomm_tty_set_serial_info(struct ircomm_tty_cb *self,
				      struct serial_struct __user *new_info)
{
#if 0
	struct serial_struct new_serial;
	struct ircomm_tty_cb old_state, *state;

	if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
		return -EFAULT;


	state = self
	old_state = *self;

	if (!capable(CAP_SYS_ADMIN)) {
		if ((new_serial.baud_base != state->settings.data_rate) ||
		    (new_serial.close_delay != state->close_delay) ||
		    ((new_serial.flags & ~ASYNC_USR_MASK) !=
		     (self->flags & ~ASYNC_USR_MASK)))
			return -EPERM;
		state->flags = ((state->flags & ~ASYNC_USR_MASK) |
				 (new_serial.flags & ASYNC_USR_MASK));
		self->flags = ((self->flags & ~ASYNC_USR_MASK) |
			       (new_serial.flags & ASYNC_USR_MASK));
		/* self->custom_divisor = new_serial.custom_divisor; */
		goto check_and_exit;
	}

	/*
	 * OK, past this point, all the error checking has been done.
	 * At this point, we start making changes.....
	 */

	if (self->settings.data_rate != new_serial.baud_base) {
		self->settings.data_rate = new_serial.baud_base;
		ircomm_param_request(self, IRCOMM_DATA_RATE, TRUE);
	}

	self->close_delay = new_serial.close_delay * HZ/100;
	self->closing_wait = new_serial.closing_wait * HZ/100;
	/* self->custom_divisor = new_serial.custom_divisor; */

	self->flags = ((self->flags & ~ASYNC_FLAGS) |
		       (new_serial.flags & ASYNC_FLAGS));
	self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0;

 check_and_exit:

	if (self->flags & ASYNC_INITIALIZED) {
		if (((old_state.flags & ASYNC_SPD_MASK) !=
		     (self->flags & ASYNC_SPD_MASK)) ||
		    (old_driver.custom_divisor != driver->custom_divisor)) {
			if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
				driver->tty->alt_speed = 57600;
			if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
				driver->tty->alt_speed = 115200;
			if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
				driver->tty->alt_speed = 230400;
			if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
				driver->tty->alt_speed = 460800;
			ircomm_tty_change_speed(driver);
		}
	}
#endif
	return 0;
}

/*
 * Function ircomm_tty_ioctl (tty, cmd, arg)
 *
 *
 *
 */
int ircomm_tty_ioctl(struct tty_struct *tty,
		     unsigned int cmd, unsigned long arg)
{
	struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
	int ret = 0;

	if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
	    (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
	    (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
		if (tty->flags & (1 << TTY_IO_ERROR))
		    return -EIO;
	}

	switch (cmd) {
	case TIOCGSERIAL:
		ret = ircomm_tty_get_serial_info(self, (struct serial_struct __user *) arg);
		break;
	case TIOCSSERIAL:
		ret = ircomm_tty_set_serial_info(self, (struct serial_struct __user *) arg);
		break;
	case TIOCMIWAIT:
		pr_debug("(), TIOCMIWAIT, not impl!\n");
		break;

	case TIOCGICOUNT:
		pr_debug("%s(), TIOCGICOUNT not impl!\n", __func__);
#if 0
		save_flags(flags); cli();
		cnow = driver->icount;
		restore_flags(flags);
		p_cuser = (struct serial_icounter_struct __user *) arg;
		if (put_user(cnow.cts, &p_cuser->cts) ||
		    put_user(cnow.dsr, &p_cuser->dsr) ||
		    put_user(cnow.rng, &p_cuser->rng) ||
		    put_user(cnow.dcd, &p_cuser->dcd) ||
		    put_user(cnow.rx, &p_cuser->rx) ||
		    put_user(cnow.tx, &p_cuser->tx) ||
		    put_user(cnow.frame, &p_cuser->frame) ||
		    put_user(cnow.overrun, &p_cuser->overrun) ||
		    put_user(cnow.parity, &p_cuser->parity) ||
		    put_user(cnow.brk, &p_cuser->brk) ||
		    put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
			return -EFAULT;
#endif
		return 0;
	default:
		ret = -ENOIOCTLCMD;  /* ioctls which we must ignore */
	}
	return ret;
}