digi_acceleport.c

linux2.4.20下的针对三星公司的s3c2410的usb模块驱动代码

		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 )
{

	struct digi_port *priv = (struct digi_port *)(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 )
{

	int ret,data_len,new_len;
	struct digi_port *priv = (struct digi_port *)(port->private);
	unsigned char *data = port->write_urb->transfer_buffer;
	unsigned char user_buf[64];	/* 64 bytes is max USB bulk packet */
	unsigned long flags = 0;


dbg( "digi_write: TOP: port=%d, count=%d, from_user=%d, in_interrupt=%d",
priv->dp_port_num, count, from_user, in_interrupt() );

	/* copy user data (which can sleep) before getting spin lock */
	count = min( count, port->bulk_out_size-2 );
	count = min( 64, count);
	if( from_user && copy_from_user( user_buf, buf, count ) ) {
		return( -EFAULT );
	}

	/* be sure only one write proceeds at a time */
	/* there are races on the port private buffer */
	/* and races to check write_urb->status */
	spin_lock_irqsave( &priv->dp_port_lock, flags );

	/* wait for urb status clear to submit another urb */
	if( port->write_urb->status == -EINPROGRESS
	|| priv->dp_write_urb_in_use ) {

		/* buffer data if count is 1 (probably put_char) if possible */
		if( count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE ) {
			priv->dp_out_buf[priv->dp_out_buf_len++]
				= *(from_user ? user_buf : buf);
			new_len = 1;
		} else {
			new_len = 0;
		}

		spin_unlock_irqrestore( &priv->dp_port_lock, flags );

		return( new_len );

	}

	/* allow space for any buffered data and for new data, up to */
	/* transfer buffer size - 2 (for command and length bytes) */
	new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
	data_len = new_len + priv->dp_out_buf_len;

	if( data_len == 0 ) {
		spin_unlock_irqrestore( &priv->dp_port_lock, flags );
		return( 0 );
	}

	port->write_urb->transfer_buffer_length = data_len+2;
	port->write_urb->dev = port->serial->dev;

	*data++ = DIGI_CMD_SEND_DATA;
	*data++ = data_len;

	/* copy in buffered data first */
	memcpy( data, priv->dp_out_buf, priv->dp_out_buf_len );
	data += priv->dp_out_buf_len;

	/* copy in new data */
	memcpy( data, from_user ? user_buf : buf, new_len );

	if( (ret=usb_submit_urb(port->write_urb)) == 0 ) {
		priv->dp_write_urb_in_use = 1;
		ret = new_len;
		priv->dp_out_buf_len = 0;
	}

	/* return length of new data written, or error */
	spin_unlock_irqrestore( &priv->dp_port_lock, flags );
	if( ret < 0 ) {
		err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__,
			ret, priv->dp_port_num );
	}

dbg( "digi_write: returning %d", ret );
	return( ret );

} 


static void digi_write_bulk_callback( struct urb *urb )
{

	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
	struct usb_serial *serial;
	struct digi_port *priv;
	int ret = 0;


dbg( "digi_write_bulk_callback: TOP, urb->status=%d", urb->status );

	/* port and serial sanity check */
	if( port == NULL || (priv=(struct digi_port *)(port->private)) == NULL ) {
		err("%s: port or port->private is NULL, status=%d", __FUNCTION__,
			urb->status );
		return;
	}
	serial = port->serial;
	if( serial == NULL || serial->private == NULL ) {
		err("%s: serial or serial->private is NULL, status=%d", __FUNCTION__, urb->status );
		return;
	}

	/* handle oob callback */
	if( priv->dp_port_num
	== ((struct digi_serial *)(serial->private))->ds_oob_port_num ) {
		dbg( "digi_write_bulk_callback: oob callback" );
		spin_lock( &priv->dp_port_lock );
		priv->dp_write_urb_in_use = 0;
		wake_up_interruptible( &port->write_wait );
		spin_unlock( &priv->dp_port_lock );
		return;
	}

	/* further sanity checks */
	if( port_paranoia_check( port, __FUNCTION__ )
	|| serial_paranoia_check( serial, __FUNCTION__ ) )
		return;

	/* try to send any buffered data on this port, if it is open */
	spin_lock( &priv->dp_port_lock );
	priv->dp_write_urb_in_use = 0;
	if( port->open_count && port->write_urb->status != -EINPROGRESS
	&& priv->dp_out_buf_len > 0 ) {

		*((unsigned char *)(port->write_urb->transfer_buffer))
			= (unsigned char)DIGI_CMD_SEND_DATA;
		*((unsigned char *)(port->write_urb->transfer_buffer)+1)
			= (unsigned char)priv->dp_out_buf_len;

		port->write_urb->transfer_buffer_length
			= priv->dp_out_buf_len+2;
		port->write_urb->dev = serial->dev;

		memcpy( port->write_urb->transfer_buffer+2, priv->dp_out_buf,
			priv->dp_out_buf_len );

		if( (ret=usb_submit_urb(port->write_urb)) == 0 ) {
			priv->dp_write_urb_in_use = 1;
			priv->dp_out_buf_len = 0;
		}

	}

	/* wake up processes sleeping on writes immediately */
	digi_wakeup_write( port );

	/* also queue up a wakeup at scheduler time, in case we */
	/* lost the race in write_chan(). */
	schedule_task(&priv->dp_wakeup_task);

	spin_unlock( &priv->dp_port_lock );

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

}


static int digi_write_room( struct usb_serial_port *port )
{

	int room;
	struct digi_port *priv = (struct digi_port *)(port->private);
	unsigned long flags = 0;


	spin_lock_irqsave( &priv->dp_port_lock, flags );

	if( port->write_urb->status == -EINPROGRESS
	|| priv->dp_write_urb_in_use )
		room = 0;
	else
		room = port->bulk_out_size - 2 - priv->dp_out_buf_len;

	spin_unlock_irqrestore( &priv->dp_port_lock, flags );

dbg( "digi_write_room: port=%d, room=%d", priv->dp_port_num, room );
	return( room );

}


static int digi_chars_in_buffer( struct usb_serial_port *port )
{

	struct digi_port *priv = (struct digi_port *)(port->private);


	if( port->write_urb->status == -EINPROGRESS
	|| priv->dp_write_urb_in_use ) {
dbg( "digi_chars_in_buffer: port=%d, chars=%d", priv->dp_port_num, port->bulk_out_size - 2 );
		/* return( port->bulk_out_size - 2 ); */
		return( 256 );
	} else {
dbg( "digi_chars_in_buffer: port=%d, chars=%d", priv->dp_port_num, priv->dp_out_buf_len );
		return( priv->dp_out_buf_len );
	}

}


static int digi_open( struct usb_serial_port *port, struct file *filp )
{

	int ret;
	unsigned char buf[32];
	struct digi_port *priv = (struct digi_port *)(port->private);
	struct termios not_termios;
	unsigned long flags = 0;


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

	/* be sure the device is started up */
	if( digi_startup_device( port->serial ) != 0 )
		return( -ENXIO );

	spin_lock_irqsave( &priv->dp_port_lock, flags );

	/* don't wait on a close in progress for non-blocking opens */
	if( priv->dp_in_close && (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) {
		spin_unlock_irqrestore( &priv->dp_port_lock, flags );
		return( -EAGAIN );
	}

	/* wait for a close in progress to finish */
	while( priv->dp_in_close ) {
		cond_wait_interruptible_timeout_irqrestore(
			&priv->dp_close_wait, DIGI_RETRY_TIMEOUT,
			&priv->dp_port_lock, flags );
		if( signal_pending(current) ) {
			return( -EINTR );
		}
		spin_lock_irqsave( &priv->dp_port_lock, flags );
	}

	spin_unlock_irqrestore( &priv->dp_port_lock, flags );
 
	/* read modem signals automatically whenever they change */
	buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
	buf[1] = priv->dp_port_num;
	buf[2] = DIGI_ENABLE;
	buf[3] = 0;

	/* flush fifos */
	buf[4] = DIGI_CMD_IFLUSH_FIFO;
	buf[5] = priv->dp_port_num;
	buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
	buf[7] = 0;

	if( (ret=digi_write_oob_command( port, buf, 8, 1 )) != 0 )
		dbg( "digi_open: write oob failed, ret=%d", ret );

	/* set termios settings */
	not_termios.c_cflag = ~port->tty->termios->c_cflag;
	not_termios.c_iflag = ~port->tty->termios->c_iflag;
	digi_set_termios( port, &not_termios );

	/* set DTR and RTS */
	digi_set_modem_signals( port, TIOCM_DTR|TIOCM_RTS, 1 );

	return( 0 );

}


static void digi_close( struct usb_serial_port *port, struct file *filp )
{

	int ret;
	unsigned char buf[32];
	struct tty_struct *tty = port->tty;
	struct digi_port *priv = (struct digi_port *)port->private;
	unsigned long flags = 0;