text: /*********************************************************************
   *                
   * 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, write to the Free Software 
   *     Foundation, Inc., 59 Temple Place, Suite 330, Boston, 
   *     MA 02111-1307 USA
   *     
   ********************************************************************/
  
  #include <linux/init.h>
  #include <linux/fs.h>
  #include <linux/sched.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
   */
  void ircomm_tty_change_speed(struct ircomm_tty_cb *self)
  {
  	unsigned cflag, cval;
  	int baud;
  
  	IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
  
  	if (!self->tty || !self->tty->termios || !self->ircomm)
  		return;
  
  	cflag = self->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(self->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->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)
  			WARNING("%s(), enabling RTS/CTS on link that doesn't support it (3-wire-raw)\n", __FUNCTION__);
  	} else {
  		self->flags &= ~ASYNC_CTS_FLOW;
  		self->settings.flow_control &= ~IRCOMM_RTS_CTS_IN;
  	}
  	if (cflag & CLOCAL)
  		self->flags &= ~ASYNC_CHECK_CD;
  	else
  		self->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 termios *old_termios)
  {
  	struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
  	unsigned int cflag = tty->termios->c_cflag;
  
  	IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
  
  	if ((cflag == old_termios->c_cflag) && 
  	    (RELEVANT_IFLAG(tty->termios->c_iflag) == 
  	     RELEVANT_IFLAG(old_termios->c_iflag)))
  	{
  		return;
  	}
  
  	ircomm_tty_change_speed(self);
  
  	/* 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_get_modem_info (self, value)
   *
   *    
   *
   */
  static int ircomm_tty_get_modem_info(struct ircomm_tty_cb *self, 
  				     unsigned int *value)
  {
  	unsigned int result;
  
  	IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
  
  	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 put_user(result, value);
  }
  
  /*
   * Function set_modem_info (driver, cmd, value)
   *
   *    
   *
   */
  static int ircomm_tty_set_modem_info(struct ircomm_tty_cb *self, 
  				     unsigned int cmd, unsigned int *value)
  { 
  	unsigned int arg;
  	__u8 old_rts, old_dtr;
  
  	IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
  
  	ASSERT(self != NULL, return -1;);
  	ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
  
  	if (get_user(arg, value))
  		return -EFAULT;
  
  	old_rts = self->settings.dte & IRCOMM_RTS;
  	old_dtr = self->settings.dte & IRCOMM_DTR;
  
  	switch (cmd) {
  	case TIOCMBIS: 
  		if (arg & TIOCM_RTS) 
  			self->settings.dte |= IRCOMM_RTS;
  		if (arg & TIOCM_DTR)
  			self->settings.dte |= IRCOMM_DTR;
  		break;
  		
  	case TIOCMBIC:
  		if (arg & TIOCM_RTS)
  			self->settings.dte &= ~IRCOMM_RTS;
  		if (arg & TIOCM_DTR)
   			self->settings.dte &= ~IRCOMM_DTR;
   		break;
  		
  	case TIOCMSET:
   		self->settings.dte = 
  			((self->settings.dte & ~(IRCOMM_RTS | IRCOMM_DTR))
  			 | ((arg & TIOCM_RTS) ? IRCOMM_RTS : 0)
  			 | ((arg & TIOCM_DTR) ? IRCOMM_DTR : 0));
  		break;
  		
  	default:
  		return -EINVAL;
  	}
  	
  	if ((self->settings.dte & IRCOMM_RTS) != old_rts)
  		self->settings.dte |= IRCOMM_DELTA_RTS;
  
  	if ((self->settings.dte & IRCOMM_DTR) != old_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 *retinfo)
  {
  	struct serial_struct info;
     
  	if (!retinfo)
  		return -EFAULT;
  
  	IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
  
  	memset(&info, 0, sizeof(info));
  	info.line = self->line;
  	info.flags = self->flags;
  	info.baud_base = self->settings.data_rate;
  	info.close_delay = self->close_delay;
  	info.closing_wait = self->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 *new_info)
  {
  #if 0
  	struct serial_struct new_serial;
  	struct ircomm_tty_cb old_state, *state;
  
  	IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
  
  	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, file, cmd, arg)
   *
   *    
   *
   */
  int ircomm_tty_ioctl(struct tty_struct *tty, struct file *file, 
  		     unsigned int cmd, unsigned long arg)
  {
  	struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
  	int ret = 0;
  
  	IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
  
  	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 TIOCMGET:
  		ret = ircomm_tty_get_modem_info(self, (unsigned int *) arg);
  		break;
  	case TIOCMBIS:
  	case TIOCMBIC:
  	case TIOCMSET:
  		ret = ircomm_tty_set_modem_info(self, cmd, (unsigned int *) arg);
  		break;
  	case TIOCGSERIAL:
  		ret = ircomm_tty_get_serial_info(self, (struct serial_struct *) arg);
  		break;
  	case TIOCSSERIAL:
  		ret = ircomm_tty_set_serial_info(self, (struct serial_struct *) arg);
  		break;
  	case TIOCMIWAIT:
  		IRDA_DEBUG(0, "(), TIOCMIWAIT, not impl!\n");
  		break;
  
  	case TIOCGICOUNT:
  		IRDA_DEBUG(0, "%s(), TIOCGICOUNT not impl!\n", __FUNCTION__ );
  #if 0
  		save_flags(flags); cli();
  		cnow = driver->icount;
  		restore_flags(flags);
  		p_cuser = (struct serial_icounter_struct *) 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;
  }
  
  
  
  