digi_acceleport.c

基于S3CEB2410平台LINUX操作系统下 USB驱动源代码

	oob_port->write_urb->transfer_buffer_length = 8;
	oob_port->write_urb->dev = port->serial->dev;

	if( (ret=usb_submit_urb(oob_port->write_urb)) == 0 ) {
		oob_priv->dp_write_urb_in_use = 1;
		port_priv->dp_modem_signals =
			(port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
			| (modem_signals&(TIOCM_DTR|TIOCM_RTS));
	}

	spin_unlock( &port_priv->dp_port_lock );
	spin_unlock_irqrestore( &oob_priv->dp_port_lock, flags );

	if( ret ) {
		err( __FUNCTION__ ": usb_submit_urb failed, ret=%d",
		ret );
	}

	return( ret );

}


/*
*  Digi Transmit Idle
*
*  Digi transmit idle waits, up to timeout ticks, for the transmitter
*  to go idle.  It returns 0 if successful or a negative error.
*
*  There are race conditions here if more than one process is calling
*  digi_transmit_idle on the same port at the same time.  However, this
*  is only called from close, and only one process can be in close on a
*  port at a time, so its ok.
*/

static int digi_transmit_idle( struct usb_serial_port *port,
	unsigned long timeout )
{

	int ret;
	unsigned char buf[2];
	digi_port_t *priv = (digi_port_t *)(port->private);
	unsigned long flags = 0;


	spin_lock_irqsave( &priv->dp_port_lock, flags );
	priv->dp_transmit_idle = 0;
	spin_unlock_irqrestore( &priv->dp_port_lock, flags );

	buf[0] = DIGI_CMD_TRANSMIT_IDLE;
	buf[1] = 0;

	timeout += jiffies;

	if( (ret=digi_write_inb_command( port, buf, 2, timeout-jiffies )) != 0 )
		return( ret );

	spin_lock_irqsave( &priv->dp_port_lock, flags );

	while( jiffies < timeout && !priv->dp_transmit_idle ) {
		cond_wait_interruptible_timeout_irqrestore(
			&priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
			&priv->dp_port_lock, flags );
		if( signal_pending(current) ) {
			return( -EINTR );
		}
		spin_lock_irqsave( &priv->dp_port_lock, flags );
	}

	priv->dp_transmit_idle = 0;
	spin_unlock_irqrestore( &priv->dp_port_lock, flags );

	return( 0 );

}


static void digi_rx_throttle( struct usb_serial_port *port )
{

	unsigned long flags;
	digi_port_t *priv = (digi_port_t *)(port->private);


dbg( "digi_rx_throttle: TOP: port=%d", priv->dp_port_num );

	/* stop receiving characters by not resubmitting the read urb */
	spin_lock_irqsave( &priv->dp_port_lock, flags );
	priv->dp_throttled = 1;
	priv->dp_throttle_restart = 0;
	priv->dp_in_buf_len = 0;
	spin_unlock_irqrestore( &priv->dp_port_lock, flags );

}


static void digi_rx_unthrottle( struct usb_serial_port *port )
{

	int ret = 0;
	int len;
	unsigned long flags;
	digi_port_t *priv = (digi_port_t *)(port->private);
	struct tty_struct *tty = port->tty;


dbg( "digi_rx_unthrottle: TOP: port=%d", priv->dp_port_num );

	spin_lock_irqsave( &priv->dp_port_lock, flags );

	/* send any buffered chars from throttle time on to tty subsystem */
	len = min(priv->dp_in_buf_len, TTY_FLIPBUF_SIZE - tty->flip.count );
	if( len > 0 ) {
		memcpy( tty->flip.char_buf_ptr, priv->dp_in_buf, len );
		memcpy( tty->flip.flag_buf_ptr, priv->dp_in_flag_buf, len );
		tty->flip.char_buf_ptr += len;
		tty->flip.flag_buf_ptr += len;
		tty->flip.count += len;
		tty_flip_buffer_push( tty );
	}

	/* restart read chain */
	if( priv->dp_throttle_restart ) {
		port->read_urb->dev = port->serial->dev;
		ret = usb_submit_urb( port->read_urb );
	}

	/* turn throttle off */
	priv->dp_throttled = 0;
	priv->dp_in_buf_len = 0;
	priv->dp_throttle_restart = 0;

	spin_unlock_irqrestore( &priv->dp_port_lock, flags );

	if( ret ) {
		err( __FUNCTION__ ": usb_submit_urb failed, ret=%d, port=%d",
			ret, priv->dp_port_num );
	}

}


static void digi_set_termios( struct usb_serial_port *port, 
	struct termios *old_termios )
{

	digi_port_t *priv = (digi_port_t *)(port->private);
	unsigned int iflag = port->tty->termios->c_iflag;
	unsigned int cflag = port->tty->termios->c_cflag;
	unsigned int old_iflag = old_termios->c_iflag;
	unsigned int old_cflag = old_termios->c_cflag;
	unsigned char buf[32];
	unsigned int modem_signals;
	int arg,ret;
	int i = 0;


dbg( "digi_set_termios: TOP: port=%d, iflag=0x%x, old_iflag=0x%x, cflag=0x%x, old_cflag=0x%x", priv->dp_port_num, iflag, old_iflag, cflag, old_cflag );

	/* set baud rate */
	if( (cflag&CBAUD) != (old_cflag&CBAUD) ) {

		arg = -1;

		/* reassert DTR and (maybe) RTS on transition from B0 */
		if( (old_cflag&CBAUD) == B0 ) {
			/* don't set RTS if using hardware flow control */
			/* and throttling input */
			modem_signals = TIOCM_DTR;
			if( !(port->tty->termios->c_cflag & CRTSCTS) ||
			!test_bit(TTY_THROTTLED, &port->tty->flags) ) {
				modem_signals |= TIOCM_RTS;
			}
			digi_set_modem_signals( port, modem_signals, 1 );
		}

		switch( (cflag&CBAUD) ) {
			/* drop DTR and RTS on transition to B0 */
		case B0: digi_set_modem_signals( port, 0, 1 ); break;
		case B50: arg = DIGI_BAUD_50; break;
		case B75: arg = DIGI_BAUD_75; break;
		case B110: arg = DIGI_BAUD_110; break;
		case B150: arg = DIGI_BAUD_150; break;
		case B200: arg = DIGI_BAUD_200; break;
		case B300: arg = DIGI_BAUD_300; break;
		case B600: arg = DIGI_BAUD_600; break;
		case B1200: arg = DIGI_BAUD_1200; break;
		case B1800: arg = DIGI_BAUD_1800; break;
		case B2400: arg = DIGI_BAUD_2400; break;
		case B4800: arg = DIGI_BAUD_4800; break;
		case B9600: arg = DIGI_BAUD_9600; break;
		case B19200: arg = DIGI_BAUD_19200; break;
		case B38400: arg = DIGI_BAUD_38400; break;
		case B57600: arg = DIGI_BAUD_57600; break;
		case B115200: arg = DIGI_BAUD_115200; break;
		case B230400: arg = DIGI_BAUD_230400; break;
		case B460800: arg = DIGI_BAUD_460800; break;
		default:
			dbg( "digi_set_termios: can't handle baud rate 0x%x",
				(cflag&CBAUD) );
			break;
		}

		if( arg != -1 ) {
			buf[i++] = DIGI_CMD_SET_BAUD_RATE;
			buf[i++] = priv->dp_port_num;
			buf[i++] = arg;
			buf[i++] = 0;
		}

	}

	/* set parity */
	if( (cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD)) ) {

		if( (cflag&PARENB) ) {
			if( (cflag&PARODD) )
				arg = DIGI_PARITY_ODD;
			else
				arg = DIGI_PARITY_EVEN;
		} else {
			arg = DIGI_PARITY_NONE;
		}

		buf[i++] = DIGI_CMD_SET_PARITY;
		buf[i++] = priv->dp_port_num;
		buf[i++] = arg;
		buf[i++] = 0;

	}

	/* set word size */
	if( (cflag&CSIZE) != (old_cflag&CSIZE) ) {

		arg = -1;

		switch( (cflag&CSIZE) ) {
		case CS5: arg = DIGI_WORD_SIZE_5; break;
		case CS6: arg = DIGI_WORD_SIZE_6; break;
		case CS7: arg = DIGI_WORD_SIZE_7; break;
		case CS8: arg = DIGI_WORD_SIZE_8; break;
		default:
			dbg( "digi_set_termios: can't handle word size %d",
				(cflag&CSIZE) );
			break;
		}

		if( arg != -1 ) {
			buf[i++] = DIGI_CMD_SET_WORD_SIZE;
			buf[i++] = priv->dp_port_num;
			buf[i++] = arg;
			buf[i++] = 0;
		}

	}

	/* set stop bits */
	if( (cflag&CSTOPB) != (old_cflag&CSTOPB) ) {

		if( (cflag&CSTOPB) )
			arg = DIGI_STOP_BITS_2;
		else
			arg = DIGI_STOP_BITS_1;

		buf[i++] = DIGI_CMD_SET_STOP_BITS;
		buf[i++] = priv->dp_port_num;
		buf[i++] = arg;
		buf[i++] = 0;

	}

	/* set input flow control */
	if( (iflag&IXOFF) != (old_iflag&IXOFF)
	|| (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) {

		arg = 0;

		if( (iflag&IXOFF) )
			arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
		else
			arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;

		if( (cflag&CRTSCTS) ) {

			arg |= DIGI_INPUT_FLOW_CONTROL_RTS;

			/* On USB-4 it is necessary to assert RTS prior */
			/* to selecting RTS input flow control.  */
			buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
			buf[i++] = priv->dp_port_num;
			buf[i++] = DIGI_RTS_ACTIVE;
			buf[i++] = 0;

		} else {
			arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
		}

		buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
		buf[i++] = priv->dp_port_num;
		buf[i++] = arg;
		buf[i++] = 0;

	}

	/* set output flow control */
	if( (iflag&IXON) != (old_iflag&IXON)
	|| (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) {

		arg = 0;

		if( (iflag&IXON) )
			arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
		else
			arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;

		if( (cflag&CRTSCTS) ) {
			arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
		} else {
			arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
			port->tty->hw_stopped = 0;
		}

		buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
		buf[i++] = priv->dp_port_num;
		buf[i++] = arg;
		buf[i++] = 0;

	}

	/* set receive enable/disable */
	if( (cflag&CREAD) != (old_cflag&CREAD) ) {

		if( (cflag&CREAD) )
			arg = DIGI_ENABLE;
		else
			arg = DIGI_DISABLE;

		buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
		buf[i++] = priv->dp_port_num;
		buf[i++] = arg;
		buf[i++] = 0;

	}

	if( (ret=digi_write_oob_command( port, buf, i, 1 )) != 0 )
		dbg( "digi_set_termios: write oob failed, ret=%d", ret );

}


static void digi_break_ctl( struct usb_serial_port *port, int break_state )
{

	unsigned char buf[4];


	buf[0] = DIGI_CMD_BREAK_CONTROL;
	buf[1] = 2;				/* length */
	buf[2] = break_state ? 1 : 0;
	buf[3] = 0;				/* pad */

	digi_write_inb_command( port, buf, 4, 0 );

}


static int digi_ioctl( struct usb_serial_port *port, struct file *file,
	unsigned int cmd, unsigned long arg )
{

	digi_port_t *priv = (digi_port_t *)(port->private);
	unsigned int val;
	unsigned long flags = 0;


dbg( "digi_ioctl: TOP: port=%d, cmd=0x%x", priv->dp_port_num, cmd );

	switch (cmd) {

	case TIOCMGET:
		spin_lock_irqsave( &priv->dp_port_lock, flags );
		val = priv->dp_modem_signals;
		spin_unlock_irqrestore( &priv->dp_port_lock, flags );
		if( copy_to_user((unsigned int *)arg, &val, sizeof(int)) )
			return( -EFAULT );
		return( 0 );

	case TIOCMSET:
	case TIOCMBIS:
	case TIOCMBIC:
		if( copy_from_user(&val, (unsigned int *)arg, sizeof(int)) )
			return( -EFAULT );
		spin_lock_irqsave( &priv->dp_port_lock, flags );
		if( cmd == TIOCMBIS )
			val = priv->dp_modem_signals | val;
		else if( cmd == TIOCMBIC )
			val = priv->dp_modem_signals & ~val;
		spin_unlock_irqrestore( &priv->dp_port_lock, flags );
		return( digi_set_modem_signals( port, val, 1 ) );

	case TIOCMIWAIT:
		/* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
		/* TODO */
		return( 0 );

	case TIOCGICOUNT:
		/* return count of modemline transitions */
		/* TODO */
		return 0;

	}

	return( -ENOIOCTLCMD );

}


static int digi_write( struct usb_serial_port *port, int from_user,
	const unsigned char *buf, int count )
{